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Diffstat (limited to '')
| -rw-r--r-- | drivers/usb/dwc2/hcd.c | 5954 |
1 files changed, 5954 insertions, 0 deletions
diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c new file mode 100644 index 000000000..35c7a4df8 --- /dev/null +++ b/drivers/usb/dwc2/hcd.c @@ -0,0 +1,5954 @@ +// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause) +/* + * hcd.c - DesignWare HS OTG Controller host-mode routines + * + * Copyright (C) 2004-2013 Synopsys, Inc. + */ + +/* + * This file contains the core HCD code, and implements the Linux hc_driver + * API + */ +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/spinlock.h> +#include <linux/interrupt.h> +#include <linux/platform_device.h> +#include <linux/dma-mapping.h> +#include <linux/delay.h> +#include <linux/io.h> +#include <linux/slab.h> +#include <linux/usb.h> + +#include <linux/usb/hcd.h> +#include <linux/usb/ch11.h> +#include <linux/usb/of.h> + +#include "core.h" +#include "hcd.h" + +/* + * ========================================================================= + * Host Core Layer Functions + * ========================================================================= + */ + +/** + * dwc2_enable_common_interrupts() - Initializes the commmon interrupts, + * used in both device and host modes + * + * @hsotg: Programming view of the DWC_otg controller + */ +static void dwc2_enable_common_interrupts(struct dwc2_hsotg *hsotg) +{ + u32 intmsk; + + /* Clear any pending OTG Interrupts */ + dwc2_writel(hsotg, 0xffffffff, GOTGINT); + + /* Clear any pending interrupts */ + dwc2_writel(hsotg, 0xffffffff, GINTSTS); + + /* Enable the interrupts in the GINTMSK */ + intmsk = GINTSTS_MODEMIS | GINTSTS_OTGINT; + + if (!hsotg->params.host_dma) + intmsk |= GINTSTS_RXFLVL; + if (!hsotg->params.external_id_pin_ctl) + intmsk |= GINTSTS_CONIDSTSCHNG; + + intmsk |= GINTSTS_WKUPINT | GINTSTS_USBSUSP | + GINTSTS_SESSREQINT; + + if (dwc2_is_device_mode(hsotg) && hsotg->params.lpm) + intmsk |= GINTSTS_LPMTRANRCVD; + + dwc2_writel(hsotg, intmsk, GINTMSK); +} + +static int dwc2_gahbcfg_init(struct dwc2_hsotg *hsotg) +{ + u32 ahbcfg = dwc2_readl(hsotg, GAHBCFG); + + switch (hsotg->hw_params.arch) { + case GHWCFG2_EXT_DMA_ARCH: + dev_err(hsotg->dev, "External DMA Mode not supported\n"); + return -EINVAL; + + case GHWCFG2_INT_DMA_ARCH: + dev_dbg(hsotg->dev, "Internal DMA Mode\n"); + if (hsotg->params.ahbcfg != -1) { + ahbcfg &= GAHBCFG_CTRL_MASK; + ahbcfg |= hsotg->params.ahbcfg & + ~GAHBCFG_CTRL_MASK; + } + break; + + case GHWCFG2_SLAVE_ONLY_ARCH: + default: + dev_dbg(hsotg->dev, "Slave Only Mode\n"); + break; + } + + if (hsotg->params.host_dma) + ahbcfg |= GAHBCFG_DMA_EN; + else + hsotg->params.dma_desc_enable = false; + + dwc2_writel(hsotg, ahbcfg, GAHBCFG); + + return 0; +} + +static void dwc2_gusbcfg_init(struct dwc2_hsotg *hsotg) +{ + u32 usbcfg; + + usbcfg = dwc2_readl(hsotg, GUSBCFG); + usbcfg &= ~(GUSBCFG_HNPCAP | GUSBCFG_SRPCAP); + + switch (hsotg->hw_params.op_mode) { + case GHWCFG2_OP_MODE_HNP_SRP_CAPABLE: + if (hsotg->params.otg_caps.hnp_support && + hsotg->params.otg_caps.srp_support) + usbcfg |= GUSBCFG_HNPCAP; + fallthrough; + + case GHWCFG2_OP_MODE_SRP_ONLY_CAPABLE: + case GHWCFG2_OP_MODE_SRP_CAPABLE_DEVICE: + case GHWCFG2_OP_MODE_SRP_CAPABLE_HOST: + if (hsotg->params.otg_caps.srp_support) + usbcfg |= GUSBCFG_SRPCAP; + break; + + case GHWCFG2_OP_MODE_NO_HNP_SRP_CAPABLE: + case GHWCFG2_OP_MODE_NO_SRP_CAPABLE_DEVICE: + case GHWCFG2_OP_MODE_NO_SRP_CAPABLE_HOST: + default: + break; + } + + dwc2_writel(hsotg, usbcfg, GUSBCFG); +} + +static int dwc2_vbus_supply_init(struct dwc2_hsotg *hsotg) +{ + if (hsotg->vbus_supply) + return regulator_enable(hsotg->vbus_supply); + + return 0; +} + +static int dwc2_vbus_supply_exit(struct dwc2_hsotg *hsotg) +{ + if (hsotg->vbus_supply) + return regulator_disable(hsotg->vbus_supply); + + return 0; +} + +/** + * dwc2_enable_host_interrupts() - Enables the Host mode interrupts + * + * @hsotg: Programming view of DWC_otg controller + */ +static void dwc2_enable_host_interrupts(struct dwc2_hsotg *hsotg) +{ + u32 intmsk; + + dev_dbg(hsotg->dev, "%s()\n", __func__); + + /* Disable all interrupts */ + dwc2_writel(hsotg, 0, GINTMSK); + dwc2_writel(hsotg, 0, HAINTMSK); + + /* Enable the common interrupts */ + dwc2_enable_common_interrupts(hsotg); + + /* Enable host mode interrupts without disturbing common interrupts */ + intmsk = dwc2_readl(hsotg, GINTMSK); + intmsk |= GINTSTS_DISCONNINT | GINTSTS_PRTINT | GINTSTS_HCHINT; + dwc2_writel(hsotg, intmsk, GINTMSK); +} + +/** + * dwc2_disable_host_interrupts() - Disables the Host Mode interrupts + * + * @hsotg: Programming view of DWC_otg controller + */ +static void dwc2_disable_host_interrupts(struct dwc2_hsotg *hsotg) +{ + u32 intmsk = dwc2_readl(hsotg, GINTMSK); + + /* Disable host mode interrupts without disturbing common interrupts */ + intmsk &= ~(GINTSTS_SOF | GINTSTS_PRTINT | GINTSTS_HCHINT | + GINTSTS_PTXFEMP | GINTSTS_NPTXFEMP | GINTSTS_DISCONNINT); + dwc2_writel(hsotg, intmsk, GINTMSK); +} + +/* + * dwc2_calculate_dynamic_fifo() - Calculates the default fifo size + * For system that have a total fifo depth that is smaller than the default + * RX + TX fifo size. + * + * @hsotg: Programming view of DWC_otg controller + */ +static void dwc2_calculate_dynamic_fifo(struct dwc2_hsotg *hsotg) +{ + struct dwc2_core_params *params = &hsotg->params; + struct dwc2_hw_params *hw = &hsotg->hw_params; + u32 rxfsiz, nptxfsiz, ptxfsiz, total_fifo_size; + + total_fifo_size = hw->total_fifo_size; + rxfsiz = params->host_rx_fifo_size; + nptxfsiz = params->host_nperio_tx_fifo_size; + ptxfsiz = params->host_perio_tx_fifo_size; + + /* + * Will use Method 2 defined in the DWC2 spec: minimum FIFO depth + * allocation with support for high bandwidth endpoints. Synopsys + * defines MPS(Max Packet size) for a periodic EP=1024, and for + * non-periodic as 512. + */ + if (total_fifo_size < (rxfsiz + nptxfsiz + ptxfsiz)) { + /* + * For Buffer DMA mode/Scatter Gather DMA mode + * 2 * ((Largest Packet size / 4) + 1 + 1) + n + * with n = number of host channel. + * 2 * ((1024/4) + 2) = 516 + */ + rxfsiz = 516 + hw->host_channels; + + /* + * min non-periodic tx fifo depth + * 2 * (largest non-periodic USB packet used / 4) + * 2 * (512/4) = 256 + */ + nptxfsiz = 256; + + /* + * min periodic tx fifo depth + * (largest packet size*MC)/4 + * (1024 * 3)/4 = 768 + */ + ptxfsiz = 768; + + params->host_rx_fifo_size = rxfsiz; + params->host_nperio_tx_fifo_size = nptxfsiz; + params->host_perio_tx_fifo_size = ptxfsiz; + } + + /* + * If the summation of RX, NPTX and PTX fifo sizes is still + * bigger than the total_fifo_size, then we have a problem. + * + * We won't be able to allocate as many endpoints. Right now, + * we're just printing an error message, but ideally this FIFO + * allocation algorithm would be improved in the future. + * + * FIXME improve this FIFO allocation algorithm. + */ + if (unlikely(total_fifo_size < (rxfsiz + nptxfsiz + ptxfsiz))) + dev_err(hsotg->dev, "invalid fifo sizes\n"); +} + +static void dwc2_config_fifos(struct dwc2_hsotg *hsotg) +{ + struct dwc2_core_params *params = &hsotg->params; + u32 nptxfsiz, hptxfsiz, dfifocfg, grxfsiz; + + if (!params->enable_dynamic_fifo) + return; + + dwc2_calculate_dynamic_fifo(hsotg); + + /* Rx FIFO */ + grxfsiz = dwc2_readl(hsotg, GRXFSIZ); + dev_dbg(hsotg->dev, "initial grxfsiz=%08x\n", grxfsiz); + grxfsiz &= ~GRXFSIZ_DEPTH_MASK; + grxfsiz |= params->host_rx_fifo_size << + GRXFSIZ_DEPTH_SHIFT & GRXFSIZ_DEPTH_MASK; + dwc2_writel(hsotg, grxfsiz, GRXFSIZ); + dev_dbg(hsotg->dev, "new grxfsiz=%08x\n", + dwc2_readl(hsotg, GRXFSIZ)); + + /* Non-periodic Tx FIFO */ + dev_dbg(hsotg->dev, "initial gnptxfsiz=%08x\n", + dwc2_readl(hsotg, GNPTXFSIZ)); + nptxfsiz = params->host_nperio_tx_fifo_size << + FIFOSIZE_DEPTH_SHIFT & FIFOSIZE_DEPTH_MASK; + nptxfsiz |= params->host_rx_fifo_size << + FIFOSIZE_STARTADDR_SHIFT & FIFOSIZE_STARTADDR_MASK; + dwc2_writel(hsotg, nptxfsiz, GNPTXFSIZ); + dev_dbg(hsotg->dev, "new gnptxfsiz=%08x\n", + dwc2_readl(hsotg, GNPTXFSIZ)); + + /* Periodic Tx FIFO */ + dev_dbg(hsotg->dev, "initial hptxfsiz=%08x\n", + dwc2_readl(hsotg, HPTXFSIZ)); + hptxfsiz = params->host_perio_tx_fifo_size << + FIFOSIZE_DEPTH_SHIFT & FIFOSIZE_DEPTH_MASK; + hptxfsiz |= (params->host_rx_fifo_size + + params->host_nperio_tx_fifo_size) << + FIFOSIZE_STARTADDR_SHIFT & FIFOSIZE_STARTADDR_MASK; + dwc2_writel(hsotg, hptxfsiz, HPTXFSIZ); + dev_dbg(hsotg->dev, "new hptxfsiz=%08x\n", + dwc2_readl(hsotg, HPTXFSIZ)); + + if (hsotg->params.en_multiple_tx_fifo && + hsotg->hw_params.snpsid >= DWC2_CORE_REV_2_91a) { + /* + * This feature was implemented in 2.91a version + * Global DFIFOCFG calculation for Host mode - + * include RxFIFO, NPTXFIFO and HPTXFIFO + */ + dfifocfg = dwc2_readl(hsotg, GDFIFOCFG); + dfifocfg &= ~GDFIFOCFG_EPINFOBASE_MASK; + dfifocfg |= (params->host_rx_fifo_size + + params->host_nperio_tx_fifo_size + + params->host_perio_tx_fifo_size) << + GDFIFOCFG_EPINFOBASE_SHIFT & + GDFIFOCFG_EPINFOBASE_MASK; + dwc2_writel(hsotg, dfifocfg, GDFIFOCFG); + } +} + +/** + * dwc2_calc_frame_interval() - Calculates the correct frame Interval value for + * the HFIR register according to PHY type and speed + * + * @hsotg: Programming view of DWC_otg controller + * + * NOTE: The caller can modify the value of the HFIR register only after the + * Port Enable bit of the Host Port Control and Status register (HPRT.EnaPort) + * has been set + */ +u32 dwc2_calc_frame_interval(struct dwc2_hsotg *hsotg) +{ + u32 usbcfg; + u32 hprt0; + int clock = 60; /* default value */ + + usbcfg = dwc2_readl(hsotg, GUSBCFG); + hprt0 = dwc2_readl(hsotg, HPRT0); + + if (!(usbcfg & GUSBCFG_PHYSEL) && (usbcfg & GUSBCFG_ULPI_UTMI_SEL) && + !(usbcfg & GUSBCFG_PHYIF16)) + clock = 60; + if ((usbcfg & GUSBCFG_PHYSEL) && hsotg->hw_params.fs_phy_type == + GHWCFG2_FS_PHY_TYPE_SHARED_ULPI) + clock = 48; + if (!(usbcfg & GUSBCFG_PHY_LP_CLK_SEL) && !(usbcfg & GUSBCFG_PHYSEL) && + !(usbcfg & GUSBCFG_ULPI_UTMI_SEL) && (usbcfg & GUSBCFG_PHYIF16)) + clock = 30; + if (!(usbcfg & GUSBCFG_PHY_LP_CLK_SEL) && !(usbcfg & GUSBCFG_PHYSEL) && + !(usbcfg & GUSBCFG_ULPI_UTMI_SEL) && !(usbcfg & GUSBCFG_PHYIF16)) + clock = 60; + if ((usbcfg & GUSBCFG_PHY_LP_CLK_SEL) && !(usbcfg & GUSBCFG_PHYSEL) && + !(usbcfg & GUSBCFG_ULPI_UTMI_SEL) && (usbcfg & GUSBCFG_PHYIF16)) + clock = 48; + if ((usbcfg & GUSBCFG_PHYSEL) && !(usbcfg & GUSBCFG_PHYIF16) && + hsotg->hw_params.fs_phy_type == GHWCFG2_FS_PHY_TYPE_SHARED_UTMI) + clock = 48; + if ((usbcfg & GUSBCFG_PHYSEL) && + hsotg->hw_params.fs_phy_type == GHWCFG2_FS_PHY_TYPE_DEDICATED) + clock = 48; + + if ((hprt0 & HPRT0_SPD_MASK) >> HPRT0_SPD_SHIFT == HPRT0_SPD_HIGH_SPEED) + /* High speed case */ + return 125 * clock - 1; + + /* FS/LS case */ + return 1000 * clock - 1; +} + +/** + * dwc2_read_packet() - Reads a packet from the Rx FIFO into the destination + * buffer + * + * @hsotg: Programming view of DWC_otg controller + * @dest: Destination buffer for the packet + * @bytes: Number of bytes to copy to the destination + */ +void dwc2_read_packet(struct dwc2_hsotg *hsotg, u8 *dest, u16 bytes) +{ + u32 *data_buf = (u32 *)dest; + int word_count = (bytes + 3) / 4; + int i; + + /* + * Todo: Account for the case where dest is not dword aligned. This + * requires reading data from the FIFO into a u32 temp buffer, then + * moving it into the data buffer. + */ + + dev_vdbg(hsotg->dev, "%s(%p,%p,%d)\n", __func__, hsotg, dest, bytes); + + for (i = 0; i < word_count; i++, data_buf++) + *data_buf = dwc2_readl(hsotg, HCFIFO(0)); +} + +/** + * dwc2_dump_channel_info() - Prints the state of a host channel + * + * @hsotg: Programming view of DWC_otg controller + * @chan: Pointer to the channel to dump + * + * Must be called with interrupt disabled and spinlock held + * + * NOTE: This function will be removed once the peripheral controller code + * is integrated and the driver is stable + */ +static void dwc2_dump_channel_info(struct dwc2_hsotg *hsotg, + struct dwc2_host_chan *chan) +{ +#ifdef VERBOSE_DEBUG + int num_channels = hsotg->params.host_channels; + struct dwc2_qh *qh; + u32 hcchar; + u32 hcsplt; + u32 hctsiz; + u32 hc_dma; + int i; + + if (!chan) + return; + + hcchar = dwc2_readl(hsotg, HCCHAR(chan->hc_num)); + hcsplt = dwc2_readl(hsotg, HCSPLT(chan->hc_num)); + hctsiz = dwc2_readl(hsotg, HCTSIZ(chan->hc_num)); + hc_dma = dwc2_readl(hsotg, HCDMA(chan->hc_num)); + + dev_dbg(hsotg->dev, " Assigned to channel %p:\n", chan); + dev_dbg(hsotg->dev, " hcchar 0x%08x, hcsplt 0x%08x\n", + hcchar, hcsplt); + dev_dbg(hsotg->dev, " hctsiz 0x%08x, hc_dma 0x%08x\n", + hctsiz, hc_dma); + dev_dbg(hsotg->dev, " dev_addr: %d, ep_num: %d, ep_is_in: %d\n", + chan->dev_addr, chan->ep_num, chan->ep_is_in); + dev_dbg(hsotg->dev, " ep_type: %d\n", chan->ep_type); + dev_dbg(hsotg->dev, " max_packet: %d\n", chan->max_packet); + dev_dbg(hsotg->dev, " data_pid_start: %d\n", chan->data_pid_start); + dev_dbg(hsotg->dev, " xfer_started: %d\n", chan->xfer_started); + dev_dbg(hsotg->dev, " halt_status: %d\n", chan->halt_status); + dev_dbg(hsotg->dev, " xfer_buf: %p\n", chan->xfer_buf); + dev_dbg(hsotg->dev, " xfer_dma: %08lx\n", + (unsigned long)chan->xfer_dma); + dev_dbg(hsotg->dev, " xfer_len: %d\n", chan->xfer_len); + dev_dbg(hsotg->dev, " qh: %p\n", chan->qh); + dev_dbg(hsotg->dev, " NP inactive sched:\n"); + list_for_each_entry(qh, &hsotg->non_periodic_sched_inactive, + qh_list_entry) + dev_dbg(hsotg->dev, " %p\n", qh); + dev_dbg(hsotg->dev, " NP waiting sched:\n"); + list_for_each_entry(qh, &hsotg->non_periodic_sched_waiting, + qh_list_entry) + dev_dbg(hsotg->dev, " %p\n", qh); + dev_dbg(hsotg->dev, " NP active sched:\n"); + list_for_each_entry(qh, &hsotg->non_periodic_sched_active, + qh_list_entry) + dev_dbg(hsotg->dev, " %p\n", qh); + dev_dbg(hsotg->dev, " Channels:\n"); + for (i = 0; i < num_channels; i++) { + struct dwc2_host_chan *chan = hsotg->hc_ptr_array[i]; + + dev_dbg(hsotg->dev, " %2d: %p\n", i, chan); + } +#endif /* VERBOSE_DEBUG */ +} + +static int _dwc2_hcd_start(struct usb_hcd *hcd); + +static void dwc2_host_start(struct dwc2_hsotg *hsotg) +{ + struct usb_hcd *hcd = dwc2_hsotg_to_hcd(hsotg); + + hcd->self.is_b_host = dwc2_hcd_is_b_host(hsotg); + _dwc2_hcd_start(hcd); +} + +static void dwc2_host_disconnect(struct dwc2_hsotg *hsotg) +{ + struct usb_hcd *hcd = dwc2_hsotg_to_hcd(hsotg); + + hcd->self.is_b_host = 0; +} + +static void dwc2_host_hub_info(struct dwc2_hsotg *hsotg, void *context, + int *hub_addr, int *hub_port) +{ + struct urb *urb = context; + + if (urb->dev->tt) + *hub_addr = urb->dev->tt->hub->devnum; + else + *hub_addr = 0; + *hub_port = urb->dev->ttport; +} + +/* + * ========================================================================= + * Low Level Host Channel Access Functions + * ========================================================================= + */ + +static void dwc2_hc_enable_slave_ints(struct dwc2_hsotg *hsotg, + struct dwc2_host_chan *chan) +{ + u32 hcintmsk = HCINTMSK_CHHLTD; + + switch (chan->ep_type) { + case USB_ENDPOINT_XFER_CONTROL: + case USB_ENDPOINT_XFER_BULK: + dev_vdbg(hsotg->dev, "control/bulk\n"); + hcintmsk |= HCINTMSK_XFERCOMPL; + hcintmsk |= HCINTMSK_STALL; + hcintmsk |= HCINTMSK_XACTERR; + hcintmsk |= HCINTMSK_DATATGLERR; + if (chan->ep_is_in) { + hcintmsk |= HCINTMSK_BBLERR; + } else { + hcintmsk |= HCINTMSK_NAK; + hcintmsk |= HCINTMSK_NYET; + if (chan->do_ping) + hcintmsk |= HCINTMSK_ACK; + } + + if (chan->do_split) { + hcintmsk |= HCINTMSK_NAK; + if (chan->complete_split) + hcintmsk |= HCINTMSK_NYET; + else + hcintmsk |= HCINTMSK_ACK; + } + + if (chan->error_state) + hcintmsk |= HCINTMSK_ACK; + break; + + case USB_ENDPOINT_XFER_INT: + if (dbg_perio()) + dev_vdbg(hsotg->dev, "intr\n"); + hcintmsk |= HCINTMSK_XFERCOMPL; + hcintmsk |= HCINTMSK_NAK; + hcintmsk |= HCINTMSK_STALL; + hcintmsk |= HCINTMSK_XACTERR; + hcintmsk |= HCINTMSK_DATATGLERR; + hcintmsk |= HCINTMSK_FRMOVRUN; + + if (chan->ep_is_in) + hcintmsk |= HCINTMSK_BBLERR; + if (chan->error_state) + hcintmsk |= HCINTMSK_ACK; + if (chan->do_split) { + if (chan->complete_split) + hcintmsk |= HCINTMSK_NYET; + else + hcintmsk |= HCINTMSK_ACK; + } + break; + + case USB_ENDPOINT_XFER_ISOC: + if (dbg_perio()) + dev_vdbg(hsotg->dev, "isoc\n"); + hcintmsk |= HCINTMSK_XFERCOMPL; + hcintmsk |= HCINTMSK_FRMOVRUN; + hcintmsk |= HCINTMSK_ACK; + + if (chan->ep_is_in) { + hcintmsk |= HCINTMSK_XACTERR; + hcintmsk |= HCINTMSK_BBLERR; + } + break; + default: + dev_err(hsotg->dev, "## Unknown EP type ##\n"); + break; + } + + dwc2_writel(hsotg, hcintmsk, HCINTMSK(chan->hc_num)); + if (dbg_hc(chan)) + dev_vdbg(hsotg->dev, "set HCINTMSK to %08x\n", hcintmsk); +} + +static void dwc2_hc_enable_dma_ints(struct dwc2_hsotg *hsotg, + struct dwc2_host_chan *chan) +{ + u32 hcintmsk = HCINTMSK_CHHLTD; + + /* + * For Descriptor DMA mode core halts the channel on AHB error. + * Interrupt is not required. + */ + if (!hsotg->params.dma_desc_enable) { + if (dbg_hc(chan)) + dev_vdbg(hsotg->dev, "desc DMA disabled\n"); + hcintmsk |= HCINTMSK_AHBERR; + } else { + if (dbg_hc(chan)) + dev_vdbg(hsotg->dev, "desc DMA enabled\n"); + if (chan->ep_type == USB_ENDPOINT_XFER_ISOC) + hcintmsk |= HCINTMSK_XFERCOMPL; + } + + if (chan->error_state && !chan->do_split && + chan->ep_type != USB_ENDPOINT_XFER_ISOC) { + if (dbg_hc(chan)) + dev_vdbg(hsotg->dev, "setting ACK\n"); + hcintmsk |= HCINTMSK_ACK; + if (chan->ep_is_in) { + hcintmsk |= HCINTMSK_DATATGLERR; + if (chan->ep_type != USB_ENDPOINT_XFER_INT) + hcintmsk |= HCINTMSK_NAK; + } + } + + dwc2_writel(hsotg, hcintmsk, HCINTMSK(chan->hc_num)); + if (dbg_hc(chan)) + dev_vdbg(hsotg->dev, "set HCINTMSK to %08x\n", hcintmsk); +} + +static void dwc2_hc_enable_ints(struct dwc2_hsotg *hsotg, + struct dwc2_host_chan *chan) +{ + u32 intmsk; + + if (hsotg->params.host_dma) { + if (dbg_hc(chan)) + dev_vdbg(hsotg->dev, "DMA enabled\n"); + dwc2_hc_enable_dma_ints(hsotg, chan); + } else { + if (dbg_hc(chan)) + dev_vdbg(hsotg->dev, "DMA disabled\n"); + dwc2_hc_enable_slave_ints(hsotg, chan); + } + + /* Enable the top level host channel interrupt */ + intmsk = dwc2_readl(hsotg, HAINTMSK); + intmsk |= 1 << chan->hc_num; + dwc2_writel(hsotg, intmsk, HAINTMSK); + if (dbg_hc(chan)) + dev_vdbg(hsotg->dev, "set HAINTMSK to %08x\n", intmsk); + + /* Make sure host channel interrupts are enabled */ + intmsk = dwc2_readl(hsotg, GINTMSK); + intmsk |= GINTSTS_HCHINT; + dwc2_writel(hsotg, intmsk, GINTMSK); + if (dbg_hc(chan)) + dev_vdbg(hsotg->dev, "set GINTMSK to %08x\n", intmsk); +} + +/** + * dwc2_hc_init() - Prepares a host channel for transferring packets to/from + * a specific endpoint + * + * @hsotg: Programming view of DWC_otg controller + * @chan: Information needed to initialize the host channel + * + * The HCCHARn register is set up with the characteristics specified in chan. + * Host channel interrupts that may need to be serviced while this transfer is + * in progress are enabled. + */ +static void dwc2_hc_init(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan) +{ + u8 hc_num = chan->hc_num; + u32 hcintmsk; + u32 hcchar; + u32 hcsplt = 0; + + if (dbg_hc(chan)) + dev_vdbg(hsotg->dev, "%s()\n", __func__); + + /* Clear old interrupt conditions for this host channel */ + hcintmsk = 0xffffffff; + hcintmsk &= ~HCINTMSK_RESERVED14_31; + dwc2_writel(hsotg, hcintmsk, HCINT(hc_num)); + + /* Enable channel interrupts required for this transfer */ + dwc2_hc_enable_ints(hsotg, chan); + + /* + * Program the HCCHARn register with the endpoint characteristics for + * the current transfer + */ + hcchar = chan->dev_addr << HCCHAR_DEVADDR_SHIFT & HCCHAR_DEVADDR_MASK; + hcchar |= chan->ep_num << HCCHAR_EPNUM_SHIFT & HCCHAR_EPNUM_MASK; + if (chan->ep_is_in) + hcchar |= HCCHAR_EPDIR; + if (chan->speed == USB_SPEED_LOW) + hcchar |= HCCHAR_LSPDDEV; + hcchar |= chan->ep_type << HCCHAR_EPTYPE_SHIFT & HCCHAR_EPTYPE_MASK; + hcchar |= chan->max_packet << HCCHAR_MPS_SHIFT & HCCHAR_MPS_MASK; + dwc2_writel(hsotg, hcchar, HCCHAR(hc_num)); + if (dbg_hc(chan)) { + dev_vdbg(hsotg->dev, "set HCCHAR(%d) to %08x\n", + hc_num, hcchar); + + dev_vdbg(hsotg->dev, "%s: Channel %d\n", + __func__, hc_num); + dev_vdbg(hsotg->dev, " Dev Addr: %d\n", + chan->dev_addr); + dev_vdbg(hsotg->dev, " Ep Num: %d\n", + chan->ep_num); + dev_vdbg(hsotg->dev, " Is In: %d\n", + chan->ep_is_in); + dev_vdbg(hsotg->dev, " Is Low Speed: %d\n", + chan->speed == USB_SPEED_LOW); + dev_vdbg(hsotg->dev, " Ep Type: %d\n", + chan->ep_type); + dev_vdbg(hsotg->dev, " Max Pkt: %d\n", + chan->max_packet); + } + + /* Program the HCSPLT register for SPLITs */ + if (chan->do_split) { + if (dbg_hc(chan)) + dev_vdbg(hsotg->dev, + "Programming HC %d with split --> %s\n", + hc_num, + chan->complete_split ? "CSPLIT" : "SSPLIT"); + if (chan->complete_split) + hcsplt |= HCSPLT_COMPSPLT; + hcsplt |= chan->xact_pos << HCSPLT_XACTPOS_SHIFT & + HCSPLT_XACTPOS_MASK; + hcsplt |= chan->hub_addr << HCSPLT_HUBADDR_SHIFT & + HCSPLT_HUBADDR_MASK; + hcsplt |= chan->hub_port << HCSPLT_PRTADDR_SHIFT & + HCSPLT_PRTADDR_MASK; + if (dbg_hc(chan)) { + dev_vdbg(hsotg->dev, " comp split %d\n", + chan->complete_split); + dev_vdbg(hsotg->dev, " xact pos %d\n", + chan->xact_pos); + dev_vdbg(hsotg->dev, " hub addr %d\n", + chan->hub_addr); + dev_vdbg(hsotg->dev, " hub port %d\n", + chan->hub_port); + dev_vdbg(hsotg->dev, " is_in %d\n", + chan->ep_is_in); + dev_vdbg(hsotg->dev, " Max Pkt %d\n", + chan->max_packet); + dev_vdbg(hsotg->dev, " xferlen %d\n", + chan->xfer_len); + } + } + + dwc2_writel(hsotg, hcsplt, HCSPLT(hc_num)); +} + +/** + * dwc2_hc_halt() - Attempts to halt a host channel + * + * @hsotg: Controller register interface + * @chan: Host channel to halt + * @halt_status: Reason for halting the channel + * + * This function should only be called in Slave mode or to abort a transfer in + * either Slave mode or DMA mode. Under normal circumstances in DMA mode, the + * controller halts the channel when the transfer is complete or a condition + * occurs that requires application intervention. + * + * In slave mode, checks for a free request queue entry, then sets the Channel + * Enable and Channel Disable bits of the Host Channel Characteristics + * register of the specified channel to intiate the halt. If there is no free + * request queue entry, sets only the Channel Disable bit of the HCCHARn + * register to flush requests for this channel. In the latter case, sets a + * flag to indicate that the host channel needs to be halted when a request + * queue slot is open. + * + * In DMA mode, always sets the Channel Enable and Channel Disable bits of the + * HCCHARn register. The controller ensures there is space in the request + * queue before submitting the halt request. + * + * Some time may elapse before the core flushes any posted requests for this + * host channel and halts. The Channel Halted interrupt handler completes the + * deactivation of the host channel. + */ +void dwc2_hc_halt(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan, + enum dwc2_halt_status halt_status) +{ + u32 nptxsts, hptxsts, hcchar; + + if (dbg_hc(chan)) + dev_vdbg(hsotg->dev, "%s()\n", __func__); + + /* + * In buffer DMA or external DMA mode channel can't be halted + * for non-split periodic channels. At the end of the next + * uframe/frame (in the worst case), the core generates a channel + * halted and disables the channel automatically. + */ + if ((hsotg->params.g_dma && !hsotg->params.g_dma_desc) || + hsotg->hw_params.arch == GHWCFG2_EXT_DMA_ARCH) { + if (!chan->do_split && + (chan->ep_type == USB_ENDPOINT_XFER_ISOC || + chan->ep_type == USB_ENDPOINT_XFER_INT)) { + dev_err(hsotg->dev, "%s() Channel can't be halted\n", + __func__); + return; + } + } + + if (halt_status == DWC2_HC_XFER_NO_HALT_STATUS) + dev_err(hsotg->dev, "!!! halt_status = %d !!!\n", halt_status); + + if (halt_status == DWC2_HC_XFER_URB_DEQUEUE || + halt_status == DWC2_HC_XFER_AHB_ERR) { + /* + * Disable all channel interrupts except Ch Halted. The QTD + * and QH state associated with this transfer has been cleared + * (in the case of URB_DEQUEUE), so the channel needs to be + * shut down carefully to prevent crashes. + */ + u32 hcintmsk = HCINTMSK_CHHLTD; + + dev_vdbg(hsotg->dev, "dequeue/error\n"); + dwc2_writel(hsotg, hcintmsk, HCINTMSK(chan->hc_num)); + + /* + * Make sure no other interrupts besides halt are currently + * pending. Handling another interrupt could cause a crash due + * to the QTD and QH state. + */ + dwc2_writel(hsotg, ~hcintmsk, HCINT(chan->hc_num)); + + /* + * Make sure the halt status is set to URB_DEQUEUE or AHB_ERR + * even if the channel was already halted for some other + * reason + */ + chan->halt_status = halt_status; + + hcchar = dwc2_readl(hsotg, HCCHAR(chan->hc_num)); + if (!(hcchar & HCCHAR_CHENA)) { + /* + * The channel is either already halted or it hasn't + * started yet. In DMA mode, the transfer may halt if + * it finishes normally or a condition occurs that + * requires driver intervention. Don't want to halt + * the channel again. In either Slave or DMA mode, + * it's possible that the transfer has been assigned + * to a channel, but not started yet when an URB is + * dequeued. Don't want to halt a channel that hasn't + * started yet. + */ + return; + } + } + if (chan->halt_pending) { + /* + * A halt has already been issued for this channel. This might + * happen when a transfer is aborted by a higher level in + * the stack. + */ + dev_vdbg(hsotg->dev, + "*** %s: Channel %d, chan->halt_pending already set ***\n", + __func__, chan->hc_num); + return; + } + + hcchar = dwc2_readl(hsotg, HCCHAR(chan->hc_num)); + + /* No need to set the bit in DDMA for disabling the channel */ + /* TODO check it everywhere channel is disabled */ + if (!hsotg->params.dma_desc_enable) { + if (dbg_hc(chan)) + dev_vdbg(hsotg->dev, "desc DMA disabled\n"); + hcchar |= HCCHAR_CHENA; + } else { + if (dbg_hc(chan)) + dev_dbg(hsotg->dev, "desc DMA enabled\n"); + } + hcchar |= HCCHAR_CHDIS; + + if (!hsotg->params.host_dma) { + if (dbg_hc(chan)) + dev_vdbg(hsotg->dev, "DMA not enabled\n"); + hcchar |= HCCHAR_CHENA; + + /* Check for space in the request queue to issue the halt */ + if (chan->ep_type == USB_ENDPOINT_XFER_CONTROL || + chan->ep_type == USB_ENDPOINT_XFER_BULK) { + dev_vdbg(hsotg->dev, "control/bulk\n"); + nptxsts = dwc2_readl(hsotg, GNPTXSTS); + if ((nptxsts & TXSTS_QSPCAVAIL_MASK) == 0) { + dev_vdbg(hsotg->dev, "Disabling channel\n"); + hcchar &= ~HCCHAR_CHENA; + } + } else { + if (dbg_perio()) + dev_vdbg(hsotg->dev, "isoc/intr\n"); + hptxsts = dwc2_readl(hsotg, HPTXSTS); + if ((hptxsts & TXSTS_QSPCAVAIL_MASK) == 0 || + hsotg->queuing_high_bandwidth) { + if (dbg_perio()) + dev_vdbg(hsotg->dev, "Disabling channel\n"); + hcchar &= ~HCCHAR_CHENA; + } + } + } else { + if (dbg_hc(chan)) + dev_vdbg(hsotg->dev, "DMA enabled\n"); + } + + dwc2_writel(hsotg, hcchar, HCCHAR(chan->hc_num)); + chan->halt_status = halt_status; + + if (hcchar & HCCHAR_CHENA) { + if (dbg_hc(chan)) + dev_vdbg(hsotg->dev, "Channel enabled\n"); + chan->halt_pending = 1; + chan->halt_on_queue = 0; + } else { + if (dbg_hc(chan)) + dev_vdbg(hsotg->dev, "Channel disabled\n"); + chan->halt_on_queue = 1; + } + + if (dbg_hc(chan)) { + dev_vdbg(hsotg->dev, "%s: Channel %d\n", __func__, + chan->hc_num); + dev_vdbg(hsotg->dev, " hcchar: 0x%08x\n", + hcchar); + dev_vdbg(hsotg->dev, " halt_pending: %d\n", + chan->halt_pending); + dev_vdbg(hsotg->dev, " halt_on_queue: %d\n", + chan->halt_on_queue); + dev_vdbg(hsotg->dev, " halt_status: %d\n", + chan->halt_status); + } +} + +/** + * dwc2_hc_cleanup() - Clears the transfer state for a host channel + * + * @hsotg: Programming view of DWC_otg controller + * @chan: Identifies the host channel to clean up + * + * This function is normally called after a transfer is done and the host + * channel is being released + */ +void dwc2_hc_cleanup(struct dwc2_hsotg *hsotg, struct dwc2_host_chan *chan) +{ + u32 hcintmsk; + + chan->xfer_started = 0; + + list_del_init(&chan->split_order_list_entry); + + /* + * Clear channel interrupt enables and any unhandled channel interrupt + * conditions + */ + dwc2_writel(hsotg, 0, HCINTMSK(chan->hc_num)); + hcintmsk = 0xffffffff; + hcintmsk &= ~HCINTMSK_RESERVED14_31; + dwc2_writel(hsotg, hcintmsk, HCINT(chan->hc_num)); +} + +/** + * dwc2_hc_set_even_odd_frame() - Sets the channel property that indicates in + * which frame a periodic transfer should occur + * + * @hsotg: Programming view of DWC_otg controller + * @chan: Identifies the host channel to set up and its properties + * @hcchar: Current value of the HCCHAR register for the specified host channel + * + * This function has no effect on non-periodic transfers + */ +static void dwc2_hc_set_even_odd_frame(struct dwc2_hsotg *hsotg, + struct dwc2_host_chan *chan, u32 *hcchar) +{ + if (chan->ep_type == USB_ENDPOINT_XFER_INT || + chan->ep_type == USB_ENDPOINT_XFER_ISOC) { + int host_speed; + int xfer_ns; + int xfer_us; + int bytes_in_fifo; + u16 fifo_space; + u16 frame_number; + u16 wire_frame; + + /* + * Try to figure out if we're an even or odd frame. If we set + * even and the current frame number is even the transfer + * will happen immediately. Similar if both are odd. If one is + * even and the other is odd then the transfer will happen when + * the frame number ticks. + * + * There's a bit of a balancing act to get this right. + * Sometimes we may want to send data in the current frame (AK + * right away). We might want to do this if the frame number + * _just_ ticked, but we might also want to do this in order + * to continue a split transaction that happened late in a + * microframe (so we didn't know to queue the next transfer + * until the frame number had ticked). The problem is that we + * need a lot of knowledge to know if there's actually still + * time to send things or if it would be better to wait until + * the next frame. + * + * We can look at how much time is left in the current frame + * and make a guess about whether we'll have time to transfer. + * We'll do that. + */ + + /* Get speed host is running at */ + host_speed = (chan->speed != USB_SPEED_HIGH && + !chan->do_split) ? chan->speed : USB_SPEED_HIGH; + + /* See how many bytes are in the periodic FIFO right now */ + fifo_space = (dwc2_readl(hsotg, HPTXSTS) & + TXSTS_FSPCAVAIL_MASK) >> TXSTS_FSPCAVAIL_SHIFT; + bytes_in_fifo = sizeof(u32) * + (hsotg->params.host_perio_tx_fifo_size - + fifo_space); + + /* + * Roughly estimate bus time for everything in the periodic + * queue + our new transfer. This is "rough" because we're + * using a function that makes takes into account IN/OUT + * and INT/ISO and we're just slamming in one value for all + * transfers. This should be an over-estimate and that should + * be OK, but we can probably tighten it. + */ + xfer_ns = usb_calc_bus_time(host_speed, false, false, + chan->xfer_len + bytes_in_fifo); + xfer_us = NS_TO_US(xfer_ns); + + /* See what frame number we'll be at by the time we finish */ + frame_number = dwc2_hcd_get_future_frame_number(hsotg, xfer_us); + + /* This is when we were scheduled to be on the wire */ + wire_frame = dwc2_frame_num_inc(chan->qh->next_active_frame, 1); + + /* + * If we'd finish _after_ the frame we're scheduled in then + * it's hopeless. Just schedule right away and hope for the + * best. Note that it _might_ be wise to call back into the + * scheduler to pick a better frame, but this is better than + * nothing. + */ + if (dwc2_frame_num_gt(frame_number, wire_frame)) { + dwc2_sch_vdbg(hsotg, + "QH=%p EO MISS fr=%04x=>%04x (%+d)\n", + chan->qh, wire_frame, frame_number, + dwc2_frame_num_dec(frame_number, + wire_frame)); + wire_frame = frame_number; + + /* + * We picked a different frame number; communicate this + * back to the scheduler so it doesn't try to schedule + * another in the same frame. + * + * Remember that next_active_frame is 1 before the wire + * frame. + */ + chan->qh->next_active_frame = + dwc2_frame_num_dec(frame_number, 1); + } + + if (wire_frame & 1) + *hcchar |= HCCHAR_ODDFRM; + else + *hcchar &= ~HCCHAR_ODDFRM; + } +} + +static void dwc2_set_pid_isoc(struct dwc2_host_chan *chan) +{ + /* Set up the initial PID for the transfer */ + if (chan->speed == USB_SPEED_HIGH) { + if (chan->ep_is_in) { + if (chan->multi_count == 1) + chan->data_pid_start = DWC2_HC_PID_DATA0; + else if (chan->multi_count == 2) + chan->data_pid_start = DWC2_HC_PID_DATA1; + else + chan->data_pid_start = DWC2_HC_PID_DATA2; + } else { + if (chan->multi_count == 1) + chan->data_pid_start = DWC2_HC_PID_DATA0; + else + chan->data_pid_start = DWC2_HC_PID_MDATA; + } + } else { + chan->data_pid_start = DWC2_HC_PID_DATA0; + } +} + +/** + * dwc2_hc_write_packet() - Writes a packet into the Tx FIFO associated with + * the Host Channel + * + * @hsotg: Programming view of DWC_otg controller + * @chan: Information needed to initialize the host channel + * + * This function should only be called in Slave mode. For a channel associated + * with a non-periodic EP, the non-periodic Tx FIFO is written. For a channel + * associated with a periodic EP, the periodic Tx FIFO is written. + * + * Upon return the xfer_buf and xfer_count fields in chan are incremented by + * the number of bytes written to the Tx FIFO. + */ +static void dwc2_hc_write_packet(struct dwc2_hsotg *hsotg, + struct dwc2_host_chan *chan) +{ + u32 i; + u32 remaining_count; + u32 byte_count; + u32 dword_count; + u32 *data_buf = (u32 *)chan->xfer_buf; + + if (dbg_hc(chan)) + dev_vdbg(hsotg->dev, "%s()\n", __func__); + + remaining_count = chan->xfer_len - chan->xfer_count; + if (remaining_count > chan->max_packet) + byte_count = chan->max_packet; + else + byte_count = remaining_count; + + dword_count = (byte_count + 3) / 4; + + if (((unsigned long)data_buf & 0x3) == 0) { + /* xfer_buf is DWORD aligned */ + for (i = 0; i < dword_count; i++, data_buf++) + dwc2_writel(hsotg, *data_buf, HCFIFO(chan->hc_num)); + } else { + /* xfer_buf is not DWORD aligned */ + for (i = 0; i < dword_count; i++, data_buf++) { + u32 data = data_buf[0] | data_buf[1] << 8 | + data_buf[2] << 16 | data_buf[3] << 24; + dwc2_writel(hsotg, data, HCFIFO(chan->hc_num)); + } + } + + chan->xfer_count += byte_count; + chan->xfer_buf += byte_count; +} + +/** + * dwc2_hc_do_ping() - Starts a PING transfer + * + * @hsotg: Programming view of DWC_otg controller + * @chan: Information needed to initialize the host channel + * + * This function should only be called in Slave mode. The Do Ping bit is set in + * the HCTSIZ register, then the channel is enabled. + */ +static void dwc2_hc_do_ping(struct dwc2_hsotg *hsotg, + struct dwc2_host_chan *chan) +{ + u32 hcchar; + u32 hctsiz; + + if (dbg_hc(chan)) + dev_vdbg(hsotg->dev, "%s: Channel %d\n", __func__, + chan->hc_num); + + hctsiz = TSIZ_DOPNG; + hctsiz |= 1 << TSIZ_PKTCNT_SHIFT; + dwc2_writel(hsotg, hctsiz, HCTSIZ(chan->hc_num)); + + hcchar = dwc2_readl(hsotg, HCCHAR(chan->hc_num)); + hcchar |= HCCHAR_CHENA; + hcchar &= ~HCCHAR_CHDIS; + dwc2_writel(hsotg, hcchar, HCCHAR(chan->hc_num)); +} + +/** + * dwc2_hc_start_transfer() - Does the setup for a data transfer for a host + * channel and starts the transfer + * + * @hsotg: Programming view of DWC_otg controller + * @chan: Information needed to initialize the host channel. The xfer_len value + * may be reduced to accommodate the max widths of the XferSize and + * PktCnt fields in the HCTSIZn register. The multi_count value may be + * changed to reflect the final xfer_len value. + * + * This function may be called in either Slave mode or DMA mode. In Slave mode, + * the caller must ensure that there is sufficient space in the request queue + * and Tx Data FIFO. + * + * For an OUT transfer in Slave mode, it loads a data packet into the + * appropriate FIFO. If necessary, additional data packets are loaded in the + * Host ISR. + * + * For an IN transfer in Slave mode, a data packet is requested. The data + * packets are unloaded from the Rx FIFO in the Host ISR. If necessary, + * additional data packets are requested in the Host ISR. + * + * For a PING transfer in Slave mode, the Do Ping bit is set in the HCTSIZ + * register along with a packet count of 1 and the channel is enabled. This + * causes a single PING transaction to occur. Other fields in HCTSIZ are + * simply set to 0 since no data transfer occurs in this case. + * + * For a PING transfer in DMA mode, the HCTSIZ register is initialized with + * all the information required to perform the subsequent data transfer. In + * addition, the Do Ping bit is set in the HCTSIZ register. In this case, the + * controller performs the entire PING protocol, then starts the data + * transfer. + */ +static void dwc2_hc_start_transfer(struct dwc2_hsotg *hsotg, + struct dwc2_host_chan *chan) +{ + u32 max_hc_xfer_size = hsotg->params.max_transfer_size; + u16 max_hc_pkt_count = hsotg->params.max_packet_count; + u32 hcchar; + u32 hctsiz = 0; + u16 num_packets; + u32 ec_mc; + + if (dbg_hc(chan)) + dev_vdbg(hsotg->dev, "%s()\n", __func__); + + if (chan->do_ping) { + if (!hsotg->params.host_dma) { + if (dbg_hc(chan)) + dev_vdbg(hsotg->dev, "ping, no DMA\n"); + dwc2_hc_do_ping(hsotg, chan); + chan->xfer_started = 1; + return; + } + + if (dbg_hc(chan)) + dev_vdbg(hsotg->dev, "ping, DMA\n"); + + hctsiz |= TSIZ_DOPNG; + } + + if (chan->do_split) { + if (dbg_hc(chan)) + dev_vdbg(hsotg->dev, "split\n"); + num_packets = 1; + + if (chan->complete_split && !chan->ep_is_in) + /* + * For CSPLIT OUT Transfer, set the size to 0 so the + * core doesn't expect any data written to the FIFO + */ + chan->xfer_len = 0; + else if (chan->ep_is_in || chan->xfer_len > chan->max_packet) + chan->xfer_len = chan->max_packet; + else if (!chan->ep_is_in && chan->xfer_len > 188) + chan->xfer_len = 188; + + hctsiz |= chan->xfer_len << TSIZ_XFERSIZE_SHIFT & + TSIZ_XFERSIZE_MASK; + + /* For split set ec_mc for immediate retries */ + if (chan->ep_type == USB_ENDPOINT_XFER_INT || + chan->ep_type == USB_ENDPOINT_XFER_ISOC) + ec_mc = 3; + else + ec_mc = 1; + } else { + if (dbg_hc(chan)) + dev_vdbg(hsotg->dev, "no split\n"); + /* + * Ensure that the transfer length and packet count will fit + * in the widths allocated for them in the HCTSIZn register + */ + if (chan->ep_type == USB_ENDPOINT_XFER_INT || + chan->ep_type == USB_ENDPOINT_XFER_ISOC) { + /* + * Make sure the transfer size is no larger than one + * (micro)frame's worth of data. (A check was done + * when the periodic transfer was accepted to ensure + * that a (micro)frame's worth of data can be + * programmed into a channel.) + */ + u32 max_periodic_len = + chan->multi_count * chan->max_packet; + + if (chan->xfer_len > max_periodic_len) + chan->xfer_len = max_periodic_len; + } else if (chan->xfer_len > max_hc_xfer_size) { + /* + * Make sure that xfer_len is a multiple of max packet + * size + */ + chan->xfer_len = + max_hc_xfer_size - chan->max_packet + 1; + } + + if (chan->xfer_len > 0) { + num_packets = (chan->xfer_len + chan->max_packet - 1) / + chan->max_packet; + if (num_packets > max_hc_pkt_count) { + num_packets = max_hc_pkt_count; + chan->xfer_len = num_packets * chan->max_packet; + } else if (chan->ep_is_in) { + /* + * Always program an integral # of max packets + * for IN transfers. + * Note: This assumes that the input buffer is + * aligned and sized accordingly. + */ + chan->xfer_len = num_packets * chan->max_packet; + } + } else { + /* Need 1 packet for transfer length of 0 */ + num_packets = 1; + } + + if (chan->ep_type == USB_ENDPOINT_XFER_INT || + chan->ep_type == USB_ENDPOINT_XFER_ISOC) + /* + * Make sure that the multi_count field matches the + * actual transfer length + */ + chan->multi_count = num_packets; + + if (chan->ep_type == USB_ENDPOINT_XFER_ISOC) + dwc2_set_pid_isoc(chan); + + hctsiz |= chan->xfer_len << TSIZ_XFERSIZE_SHIFT & + TSIZ_XFERSIZE_MASK; + + /* The ec_mc gets the multi_count for non-split */ + ec_mc = chan->multi_count; + } + + chan->start_pkt_count = num_packets; + hctsiz |= num_packets << TSIZ_PKTCNT_SHIFT & TSIZ_PKTCNT_MASK; + hctsiz |= chan->data_pid_start << TSIZ_SC_MC_PID_SHIFT & + TSIZ_SC_MC_PID_MASK; + dwc2_writel(hsotg, hctsiz, HCTSIZ(chan->hc_num)); + if (dbg_hc(chan)) { + dev_vdbg(hsotg->dev, "Wrote %08x to HCTSIZ(%d)\n", + hctsiz, chan->hc_num); + + dev_vdbg(hsotg->dev, "%s: Channel %d\n", __func__, + chan->hc_num); + dev_vdbg(hsotg->dev, " Xfer Size: %d\n", + (hctsiz & TSIZ_XFERSIZE_MASK) >> + TSIZ_XFERSIZE_SHIFT); + dev_vdbg(hsotg->dev, " Num Pkts: %d\n", + (hctsiz & TSIZ_PKTCNT_MASK) >> + TSIZ_PKTCNT_SHIFT); + dev_vdbg(hsotg->dev, " Start PID: %d\n", + (hctsiz & TSIZ_SC_MC_PID_MASK) >> + TSIZ_SC_MC_PID_SHIFT); + } + + if (hsotg->params.host_dma) { + dma_addr_t dma_addr; + + if (chan->align_buf) { + if (dbg_hc(chan)) + dev_vdbg(hsotg->dev, "align_buf\n"); + dma_addr = chan->align_buf; + } else { + dma_addr = chan->xfer_dma; + } + dwc2_writel(hsotg, (u32)dma_addr, HCDMA(chan->hc_num)); + + if (dbg_hc(chan)) + dev_vdbg(hsotg->dev, "Wrote %08lx to HCDMA(%d)\n", + (unsigned long)dma_addr, chan->hc_num); + } + + /* Start the split */ + if (chan->do_split) { + u32 hcsplt = dwc2_readl(hsotg, HCSPLT(chan->hc_num)); + + hcsplt |= HCSPLT_SPLTENA; + dwc2_writel(hsotg, hcsplt, HCSPLT(chan->hc_num)); + } + + hcchar = dwc2_readl(hsotg, HCCHAR(chan->hc_num)); + hcchar &= ~HCCHAR_MULTICNT_MASK; + hcchar |= (ec_mc << HCCHAR_MULTICNT_SHIFT) & HCCHAR_MULTICNT_MASK; + dwc2_hc_set_even_odd_frame(hsotg, chan, &hcchar); + + if (hcchar & HCCHAR_CHDIS) + dev_warn(hsotg->dev, + "%s: chdis set, channel %d, hcchar 0x%08x\n", + __func__, chan->hc_num, hcchar); + + /* Set host channel enable after all other setup is complete */ + hcchar |= HCCHAR_CHENA; + hcchar &= ~HCCHAR_CHDIS; + + if (dbg_hc(chan)) + dev_vdbg(hsotg->dev, " Multi Cnt: %d\n", + (hcchar & HCCHAR_MULTICNT_MASK) >> + HCCHAR_MULTICNT_SHIFT); + + dwc2_writel(hsotg, hcchar, HCCHAR(chan->hc_num)); + if (dbg_hc(chan)) + dev_vdbg(hsotg->dev, "Wrote %08x to HCCHAR(%d)\n", hcchar, + chan->hc_num); + + chan->xfer_started = 1; + chan->requests++; + + if (!hsotg->params.host_dma && + !chan->ep_is_in && chan->xfer_len > 0) + /* Load OUT packet into the appropriate Tx FIFO */ + dwc2_hc_write_packet(hsotg, chan); +} + +/** + * dwc2_hc_start_transfer_ddma() - Does the setup for a data transfer for a + * host channel and starts the transfer in Descriptor DMA mode + * + * @hsotg: Programming view of DWC_otg controller + * @chan: Information needed to initialize the host channel + * + * Initializes HCTSIZ register. For a PING transfer the Do Ping bit is set. + * Sets PID and NTD values. For periodic transfers initializes SCHED_INFO field + * with micro-frame bitmap. + * + * Initializes HCDMA register with descriptor list address and CTD value then + * starts the transfer via enabling the channel. + */ +void dwc2_hc_start_transfer_ddma(struct dwc2_hsotg *hsotg, + struct dwc2_host_chan *chan) +{ + u32 hcchar; + u32 hctsiz = 0; + + if (chan->do_ping) + hctsiz |= TSIZ_DOPNG; + + if (chan->ep_type == USB_ENDPOINT_XFER_ISOC) + dwc2_set_pid_isoc(chan); + + /* Packet Count and Xfer Size are not used in Descriptor DMA mode */ + hctsiz |= chan->data_pid_start << TSIZ_SC_MC_PID_SHIFT & + TSIZ_SC_MC_PID_MASK; + + /* 0 - 1 descriptor, 1 - 2 descriptors, etc */ + hctsiz |= (chan->ntd - 1) << TSIZ_NTD_SHIFT & TSIZ_NTD_MASK; + + /* Non-zero only for high-speed interrupt endpoints */ + hctsiz |= chan->schinfo << TSIZ_SCHINFO_SHIFT & TSIZ_SCHINFO_MASK; + + if (dbg_hc(chan)) { + dev_vdbg(hsotg->dev, "%s: Channel %d\n", __func__, + chan->hc_num); + dev_vdbg(hsotg->dev, " Start PID: %d\n", + chan->data_pid_start); + dev_vdbg(hsotg->dev, " NTD: %d\n", chan->ntd - 1); + } + + dwc2_writel(hsotg, hctsiz, HCTSIZ(chan->hc_num)); + + dma_sync_single_for_device(hsotg->dev, chan->desc_list_addr, + chan->desc_list_sz, DMA_TO_DEVICE); + + dwc2_writel(hsotg, chan->desc_list_addr, HCDMA(chan->hc_num)); + + if (dbg_hc(chan)) + dev_vdbg(hsotg->dev, "Wrote %pad to HCDMA(%d)\n", + &chan->desc_list_addr, chan->hc_num); + + hcchar = dwc2_readl(hsotg, HCCHAR(chan->hc_num)); + hcchar &= ~HCCHAR_MULTICNT_MASK; + hcchar |= chan->multi_count << HCCHAR_MULTICNT_SHIFT & + HCCHAR_MULTICNT_MASK; + + if (hcchar & HCCHAR_CHDIS) + dev_warn(hsotg->dev, + "%s: chdis set, channel %d, hcchar 0x%08x\n", + __func__, chan->hc_num, hcchar); + + /* Set host channel enable after all other setup is complete */ + hcchar |= HCCHAR_CHENA; + hcchar &= ~HCCHAR_CHDIS; + + if (dbg_hc(chan)) + dev_vdbg(hsotg->dev, " Multi Cnt: %d\n", + (hcchar & HCCHAR_MULTICNT_MASK) >> + HCCHAR_MULTICNT_SHIFT); + + dwc2_writel(hsotg, hcchar, HCCHAR(chan->hc_num)); + if (dbg_hc(chan)) + dev_vdbg(hsotg->dev, "Wrote %08x to HCCHAR(%d)\n", hcchar, + chan->hc_num); + + chan->xfer_started = 1; + chan->requests++; +} + +/** + * dwc2_hc_continue_transfer() - Continues a data transfer that was started by + * a previous call to dwc2_hc_start_transfer() + * + * @hsotg: Programming view of DWC_otg controller + * @chan: Information needed to initialize the host channel + * + * The caller must ensure there is sufficient space in the request queue and Tx + * Data FIFO. This function should only be called in Slave mode. In DMA mode, + * the controller acts autonomously to complete transfers programmed to a host + * channel. + * + * For an OUT transfer, a new data packet is loaded into the appropriate FIFO + * if there is any data remaining to be queued. For an IN transfer, another + * data packet is always requested. For the SETUP phase of a control transfer, + * this function does nothing. + * + * Return: 1 if a new request is queued, 0 if no more requests are required + * for this transfer + */ +static int dwc2_hc_continue_transfer(struct dwc2_hsotg *hsotg, + struct dwc2_host_chan *chan) +{ + if (dbg_hc(chan)) + dev_vdbg(hsotg->dev, "%s: Channel %d\n", __func__, + chan->hc_num); + + if (chan->do_split) + /* SPLITs always queue just once per channel */ + return 0; + + if (chan->data_pid_start == DWC2_HC_PID_SETUP) + /* SETUPs are queued only once since they can't be NAK'd */ + return 0; + + if (chan->ep_is_in) { + /* + * Always queue another request for other IN transfers. If + * back-to-back INs are issued and NAKs are received for both, + * the driver may still be processing the first NAK when the + * second NAK is received. When the interrupt handler clears + * the NAK interrupt for the first NAK, the second NAK will + * not be seen. So we can't depend on the NAK interrupt + * handler to requeue a NAK'd request. Instead, IN requests + * are issued each time this function is called. When the + * transfer completes, the extra requests for the channel will + * be flushed. + */ + u32 hcchar = dwc2_readl(hsotg, HCCHAR(chan->hc_num)); + + dwc2_hc_set_even_odd_frame(hsotg, chan, &hcchar); + hcchar |= HCCHAR_CHENA; + hcchar &= ~HCCHAR_CHDIS; + if (dbg_hc(chan)) + dev_vdbg(hsotg->dev, " IN xfer: hcchar = 0x%08x\n", + hcchar); + dwc2_writel(hsotg, hcchar, HCCHAR(chan->hc_num)); + chan->requests++; + return 1; + } + + /* OUT transfers */ + + if (chan->xfer_count < chan->xfer_len) { + if (chan->ep_type == USB_ENDPOINT_XFER_INT || + chan->ep_type == USB_ENDPOINT_XFER_ISOC) { + u32 hcchar = dwc2_readl(hsotg, + HCCHAR(chan->hc_num)); + + dwc2_hc_set_even_odd_frame(hsotg, chan, + &hcchar); + } + + /* Load OUT packet into the appropriate Tx FIFO */ + dwc2_hc_write_packet(hsotg, chan); + chan->requests++; + return 1; + } + + return 0; +} + +/* + * ========================================================================= + * HCD + * ========================================================================= + */ + +/* + * Processes all the URBs in a single list of QHs. Completes them with + * -ETIMEDOUT and frees the QTD. + * + * Must be called with interrupt disabled and spinlock held + */ +static void dwc2_kill_urbs_in_qh_list(struct dwc2_hsotg *hsotg, + struct list_head *qh_list) +{ + struct dwc2_qh *qh, *qh_tmp; + struct dwc2_qtd *qtd, *qtd_tmp; + + list_for_each_entry_safe(qh, qh_tmp, qh_list, qh_list_entry) { + list_for_each_entry_safe(qtd, qtd_tmp, &qh->qtd_list, + qtd_list_entry) { + dwc2_host_complete(hsotg, qtd, -ECONNRESET); + dwc2_hcd_qtd_unlink_and_free(hsotg, qtd, qh); + } + } +} + +static void dwc2_qh_list_free(struct dwc2_hsotg *hsotg, + struct list_head *qh_list) +{ + struct dwc2_qtd *qtd, *qtd_tmp; + struct dwc2_qh *qh, *qh_tmp; + unsigned long flags; + + if (!qh_list->next) + /* The list hasn't been initialized yet */ + return; + + spin_lock_irqsave(&hsotg->lock, flags); + + /* Ensure there are no QTDs or URBs left */ + dwc2_kill_urbs_in_qh_list(hsotg, qh_list); + + list_for_each_entry_safe(qh, qh_tmp, qh_list, qh_list_entry) { + dwc2_hcd_qh_unlink(hsotg, qh); + + /* Free each QTD in the QH's QTD list */ + list_for_each_entry_safe(qtd, qtd_tmp, &qh->qtd_list, + qtd_list_entry) + dwc2_hcd_qtd_unlink_and_free(hsotg, qtd, qh); + + if (qh->channel && qh->channel->qh == qh) + qh->channel->qh = NULL; + + spin_unlock_irqrestore(&hsotg->lock, flags); + dwc2_hcd_qh_free(hsotg, qh); + spin_lock_irqsave(&hsotg->lock, flags); + } + + spin_unlock_irqrestore(&hsotg->lock, flags); +} + +/* + * Responds with an error status of -ETIMEDOUT to all URBs in the non-periodic + * and periodic schedules. The QTD associated with each URB is removed from + * the schedule and freed. This function may be called when a disconnect is + * detected or when the HCD is being stopped. + * + * Must be called with interrupt disabled and spinlock held + */ +static void dwc2_kill_all_urbs(struct dwc2_hsotg *hsotg) +{ + dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->non_periodic_sched_inactive); + dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->non_periodic_sched_waiting); + dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->non_periodic_sched_active); + dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->periodic_sched_inactive); + dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->periodic_sched_ready); + dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->periodic_sched_assigned); + dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->periodic_sched_queued); +} + +/** + * dwc2_hcd_start() - Starts the HCD when switching to Host mode + * + * @hsotg: Pointer to struct dwc2_hsotg + */ +void dwc2_hcd_start(struct dwc2_hsotg *hsotg) +{ + u32 hprt0; + + if (hsotg->op_state == OTG_STATE_B_HOST) { + /* + * Reset the port. During a HNP mode switch the reset + * needs to occur within 1ms and have a duration of at + * least 50ms. + */ + hprt0 = dwc2_read_hprt0(hsotg); + hprt0 |= HPRT0_RST; + dwc2_writel(hsotg, hprt0, HPRT0); + } + + queue_delayed_work(hsotg->wq_otg, &hsotg->start_work, + msecs_to_jiffies(50)); +} + +/* Must be called with interrupt disabled and spinlock held */ +static void dwc2_hcd_cleanup_channels(struct dwc2_hsotg *hsotg) +{ + int num_channels = hsotg->params.host_channels; + struct dwc2_host_chan *channel; + u32 hcchar; + int i; + + if (!hsotg->params.host_dma) { + /* Flush out any channel requests in slave mode */ + for (i = 0; i < num_channels; i++) { + channel = hsotg->hc_ptr_array[i]; + if (!list_empty(&channel->hc_list_entry)) + continue; + hcchar = dwc2_readl(hsotg, HCCHAR(i)); + if (hcchar & HCCHAR_CHENA) { + hcchar &= ~(HCCHAR_CHENA | HCCHAR_EPDIR); + hcchar |= HCCHAR_CHDIS; + dwc2_writel(hsotg, hcchar, HCCHAR(i)); + } + } + } + + for (i = 0; i < num_channels; i++) { + channel = hsotg->hc_ptr_array[i]; + if (!list_empty(&channel->hc_list_entry)) + continue; + hcchar = dwc2_readl(hsotg, HCCHAR(i)); + if (hcchar & HCCHAR_CHENA) { + /* Halt the channel */ + hcchar |= HCCHAR_CHDIS; + dwc2_writel(hsotg, hcchar, HCCHAR(i)); + } + + dwc2_hc_cleanup(hsotg, channel); + list_add_tail(&channel->hc_list_entry, &hsotg->free_hc_list); + /* + * Added for Descriptor DMA to prevent channel double cleanup in + * release_channel_ddma(), which is called from ep_disable when + * device disconnects + */ + channel->qh = NULL; + } + /* All channels have been freed, mark them available */ + if (hsotg->params.uframe_sched) { + hsotg->available_host_channels = + hsotg->params.host_channels; + } else { + hsotg->non_periodic_channels = 0; + hsotg->periodic_channels = 0; + } +} + +/** + * dwc2_hcd_connect() - Handles connect of the HCD + * + * @hsotg: Pointer to struct dwc2_hsotg + * + * Must be called with interrupt disabled and spinlock held + */ +void dwc2_hcd_connect(struct dwc2_hsotg *hsotg) +{ + if (hsotg->lx_state != DWC2_L0) + usb_hcd_resume_root_hub(hsotg->priv); + + hsotg->flags.b.port_connect_status_change = 1; + hsotg->flags.b.port_connect_status = 1; +} + +/** + * dwc2_hcd_disconnect() - Handles disconnect of the HCD + * + * @hsotg: Pointer to struct dwc2_hsotg + * @force: If true, we won't try to reconnect even if we see device connected. + * + * Must be called with interrupt disabled and spinlock held + */ +void dwc2_hcd_disconnect(struct dwc2_hsotg *hsotg, bool force) +{ + u32 intr; + u32 hprt0; + + /* Set status flags for the hub driver */ + hsotg->flags.b.port_connect_status_change = 1; + hsotg->flags.b.port_connect_status = 0; + + /* + * Shutdown any transfers in process by clearing the Tx FIFO Empty + * interrupt mask and status bits and disabling subsequent host + * channel interrupts. + */ + intr = dwc2_readl(hsotg, GINTMSK); + intr &= ~(GINTSTS_NPTXFEMP | GINTSTS_PTXFEMP | GINTSTS_HCHINT); + dwc2_writel(hsotg, intr, GINTMSK); + intr = GINTSTS_NPTXFEMP | GINTSTS_PTXFEMP | GINTSTS_HCHINT; + dwc2_writel(hsotg, intr, GINTSTS); + + /* + * Turn off the vbus power only if the core has transitioned to device + * mode. If still in host mode, need to keep power on to detect a + * reconnection. + */ + if (dwc2_is_device_mode(hsotg)) { + if (hsotg->op_state != OTG_STATE_A_SUSPEND) { + dev_dbg(hsotg->dev, "Disconnect: PortPower off\n"); + dwc2_writel(hsotg, 0, HPRT0); + } + + dwc2_disable_host_interrupts(hsotg); + } + + /* Respond with an error status to all URBs in the schedule */ + dwc2_kill_all_urbs(hsotg); + + if (dwc2_is_host_mode(hsotg)) + /* Clean up any host channels that were in use */ + dwc2_hcd_cleanup_channels(hsotg); + + dwc2_host_disconnect(hsotg); + + /* + * Add an extra check here to see if we're actually connected but + * we don't have a detection interrupt pending. This can happen if: + * 1. hardware sees connect + * 2. hardware sees disconnect + * 3. hardware sees connect + * 4. dwc2_port_intr() - clears connect interrupt + * 5. dwc2_handle_common_intr() - calls here + * + * Without the extra check here we will end calling disconnect + * and won't get any future interrupts to handle the connect. + */ + if (!force) { + hprt0 = dwc2_readl(hsotg, HPRT0); + if (!(hprt0 & HPRT0_CONNDET) && (hprt0 & HPRT0_CONNSTS)) + dwc2_hcd_connect(hsotg); + } +} + +/** + * dwc2_hcd_rem_wakeup() - Handles Remote Wakeup + * + * @hsotg: Pointer to struct dwc2_hsotg + */ +static void dwc2_hcd_rem_wakeup(struct dwc2_hsotg *hsotg) +{ + if (hsotg->bus_suspended) { + hsotg->flags.b.port_suspend_change = 1; + usb_hcd_resume_root_hub(hsotg->priv); + } + + if (hsotg->lx_state == DWC2_L1) + hsotg->flags.b.port_l1_change = 1; +} + +/** + * dwc2_hcd_stop() - Halts the DWC_otg host mode operations in a clean manner + * + * @hsotg: Pointer to struct dwc2_hsotg + * + * Must be called with interrupt disabled and spinlock held + */ +void dwc2_hcd_stop(struct dwc2_hsotg *hsotg) +{ + dev_dbg(hsotg->dev, "DWC OTG HCD STOP\n"); + + /* + * The root hub should be disconnected before this function is called. + * The disconnect will clear the QTD lists (via ..._hcd_urb_dequeue) + * and the QH lists (via ..._hcd_endpoint_disable). + */ + + /* Turn off all host-specific interrupts */ + dwc2_disable_host_interrupts(hsotg); + + /* Turn off the vbus power */ + dev_dbg(hsotg->dev, "PortPower off\n"); + dwc2_writel(hsotg, 0, HPRT0); +} + +/* Caller must hold driver lock */ +static int dwc2_hcd_urb_enqueue(struct dwc2_hsotg *hsotg, + struct dwc2_hcd_urb *urb, struct dwc2_qh *qh, + struct dwc2_qtd *qtd) +{ + u32 intr_mask; + int retval; + int dev_speed; + + if (!hsotg->flags.b.port_connect_status) { + /* No longer connected */ + dev_err(hsotg->dev, "Not connected\n"); + return -ENODEV; + } + + dev_speed = dwc2_host_get_speed(hsotg, urb->priv); + + /* Some configurations cannot support LS traffic on a FS root port */ + if ((dev_speed == USB_SPEED_LOW) && + (hsotg->hw_params.fs_phy_type == GHWCFG2_FS_PHY_TYPE_DEDICATED) && + (hsotg->hw_params.hs_phy_type == GHWCFG2_HS_PHY_TYPE_UTMI)) { + u32 hprt0 = dwc2_readl(hsotg, HPRT0); + u32 prtspd = (hprt0 & HPRT0_SPD_MASK) >> HPRT0_SPD_SHIFT; + + if (prtspd == HPRT0_SPD_FULL_SPEED) + return -ENODEV; + } + + if (!qtd) + return -EINVAL; + + dwc2_hcd_qtd_init(qtd, urb); + retval = dwc2_hcd_qtd_add(hsotg, qtd, qh); + if (retval) { + dev_err(hsotg->dev, + "DWC OTG HCD URB Enqueue failed adding QTD. Error status %d\n", + retval); + return retval; + } + + intr_mask = dwc2_readl(hsotg, GINTMSK); + if (!(intr_mask & GINTSTS_SOF)) { + enum dwc2_transaction_type tr_type; + + if (qtd->qh->ep_type == USB_ENDPOINT_XFER_BULK && + !(qtd->urb->flags & URB_GIVEBACK_ASAP)) + /* + * Do not schedule SG transactions until qtd has + * URB_GIVEBACK_ASAP set + */ + return 0; + + tr_type = dwc2_hcd_select_transactions(hsotg); + if (tr_type != DWC2_TRANSACTION_NONE) + dwc2_hcd_queue_transactions(hsotg, tr_type); + } + + return 0; +} + +/* Must be called with interrupt disabled and spinlock held */ +static int dwc2_hcd_urb_dequeue(struct dwc2_hsotg *hsotg, + struct dwc2_hcd_urb *urb) +{ + struct dwc2_qh *qh; + struct dwc2_qtd *urb_qtd; + + urb_qtd = urb->qtd; + if (!urb_qtd) { + dev_dbg(hsotg->dev, "## Urb QTD is NULL ##\n"); + return -EINVAL; + } + + qh = urb_qtd->qh; + if (!qh) { + dev_dbg(hsotg->dev, "## Urb QTD QH is NULL ##\n"); + return -EINVAL; + } + + urb->priv = NULL; + + if (urb_qtd->in_process && qh->channel) { + dwc2_dump_channel_info(hsotg, qh->channel); + + /* The QTD is in process (it has been assigned to a channel) */ + if (hsotg->flags.b.port_connect_status) + /* + * If still connected (i.e. in host mode), halt the + * channel so it can be used for other transfers. If + * no longer connected, the host registers can't be + * written to halt the channel since the core is in + * device mode. + */ + dwc2_hc_halt(hsotg, qh->channel, + DWC2_HC_XFER_URB_DEQUEUE); + } + + /* + * Free the QTD and clean up the associated QH. Leave the QH in the + * schedule if it has any remaining QTDs. + */ + if (!hsotg->params.dma_desc_enable) { + u8 in_process = urb_qtd->in_process; + + dwc2_hcd_qtd_unlink_and_free(hsotg, urb_qtd, qh); + if (in_process) { + dwc2_hcd_qh_deactivate(hsotg, qh, 0); + qh->channel = NULL; + } else if (list_empty(&qh->qtd_list)) { + dwc2_hcd_qh_unlink(hsotg, qh); + } + } else { + dwc2_hcd_qtd_unlink_and_free(hsotg, urb_qtd, qh); + } + + return 0; +} + +/* Must NOT be called with interrupt disabled or spinlock held */ +static int dwc2_hcd_endpoint_disable(struct dwc2_hsotg *hsotg, + struct usb_host_endpoint *ep, int retry) +{ + struct dwc2_qtd *qtd, *qtd_tmp; + struct dwc2_qh *qh; + unsigned long flags; + int rc; + + spin_lock_irqsave(&hsotg->lock, flags); + + qh = ep->hcpriv; + if (!qh) { + rc = -EINVAL; + goto err; + } + + while (!list_empty(&qh->qtd_list) && retry--) { + if (retry == 0) { + dev_err(hsotg->dev, + "## timeout in dwc2_hcd_endpoint_disable() ##\n"); + rc = -EBUSY; + goto err; + } + + spin_unlock_irqrestore(&hsotg->lock, flags); + msleep(20); + spin_lock_irqsave(&hsotg->lock, flags); + qh = ep->hcpriv; + if (!qh) { + rc = -EINVAL; + goto err; + } + } + + dwc2_hcd_qh_unlink(hsotg, qh); + + /* Free each QTD in the QH's QTD list */ + list_for_each_entry_safe(qtd, qtd_tmp, &qh->qtd_list, qtd_list_entry) + dwc2_hcd_qtd_unlink_and_free(hsotg, qtd, qh); + + ep->hcpriv = NULL; + + if (qh->channel && qh->channel->qh == qh) + qh->channel->qh = NULL; + + spin_unlock_irqrestore(&hsotg->lock, flags); + + dwc2_hcd_qh_free(hsotg, qh); + + return 0; + +err: + ep->hcpriv = NULL; + spin_unlock_irqrestore(&hsotg->lock, flags); + + return rc; +} + +/* Must be called with interrupt disabled and spinlock held */ +static int dwc2_hcd_endpoint_reset(struct dwc2_hsotg *hsotg, + struct usb_host_endpoint *ep) +{ + struct dwc2_qh *qh = ep->hcpriv; + + if (!qh) + return -EINVAL; + + qh->data_toggle = DWC2_HC_PID_DATA0; + + return 0; +} + +/** + * dwc2_core_init() - Initializes the DWC_otg controller registers and + * prepares the core for device mode or host mode operation + * + * @hsotg: Programming view of the DWC_otg controller + * @initial_setup: If true then this is the first init for this instance. + */ +int dwc2_core_init(struct dwc2_hsotg *hsotg, bool initial_setup) +{ + u32 usbcfg, otgctl; + int retval; + + dev_dbg(hsotg->dev, "%s(%p)\n", __func__, hsotg); + + usbcfg = dwc2_readl(hsotg, GUSBCFG); + + /* Set ULPI External VBUS bit if needed */ + usbcfg &= ~GUSBCFG_ULPI_EXT_VBUS_DRV; + if (hsotg->params.phy_ulpi_ext_vbus) + usbcfg |= GUSBCFG_ULPI_EXT_VBUS_DRV; + + /* Set external TS Dline pulsing bit if needed */ + usbcfg &= ~GUSBCFG_TERMSELDLPULSE; + if (hsotg->params.ts_dline) + usbcfg |= GUSBCFG_TERMSELDLPULSE; + + dwc2_writel(hsotg, usbcfg, GUSBCFG); + + /* + * Reset the Controller + * + * We only need to reset the controller if this is a re-init. + * For the first init we know for sure that earlier code reset us (it + * needed to in order to properly detect various parameters). + */ + if (!initial_setup) { + retval = dwc2_core_reset(hsotg, false); + if (retval) { + dev_err(hsotg->dev, "%s(): Reset failed, aborting\n", + __func__); + return retval; + } + } + + /* + * This needs to happen in FS mode before any other programming occurs + */ + retval = dwc2_phy_init(hsotg, initial_setup); + if (retval) + return retval; + + /* Program the GAHBCFG Register */ + retval = dwc2_gahbcfg_init(hsotg); + if (retval) + return retval; + + /* Program the GUSBCFG register */ + dwc2_gusbcfg_init(hsotg); + + /* Program the GOTGCTL register */ + otgctl = dwc2_readl(hsotg, GOTGCTL); + otgctl &= ~GOTGCTL_OTGVER; + dwc2_writel(hsotg, otgctl, GOTGCTL); + + /* Clear the SRP success bit for FS-I2c */ + hsotg->srp_success = 0; + + /* Enable common interrupts */ + dwc2_enable_common_interrupts(hsotg); + + /* + * Do device or host initialization based on mode during PCD and + * HCD initialization + */ + if (dwc2_is_host_mode(hsotg)) { + dev_dbg(hsotg->dev, "Host Mode\n"); + hsotg->op_state = OTG_STATE_A_HOST; + } else { + dev_dbg(hsotg->dev, "Device Mode\n"); + hsotg->op_state = OTG_STATE_B_PERIPHERAL; + } + + return 0; +} + +/** + * dwc2_core_host_init() - Initializes the DWC_otg controller registers for + * Host mode + * + * @hsotg: Programming view of DWC_otg controller + * + * This function flushes the Tx and Rx FIFOs and flushes any entries in the + * request queues. Host channels are reset to ensure that they are ready for + * performing transfers. + */ +static void dwc2_core_host_init(struct dwc2_hsotg *hsotg) +{ + u32 hcfg, hfir, otgctl, usbcfg; + + dev_dbg(hsotg->dev, "%s(%p)\n", __func__, hsotg); + + /* Set HS/FS Timeout Calibration to 7 (max available value). + * The number of PHY clocks that the application programs in + * this field is added to the high/full speed interpacket timeout + * duration in the core to account for any additional delays + * introduced by the PHY. This can be required, because the delay + * introduced by the PHY in generating the linestate condition + * can vary from one PHY to another. + */ + usbcfg = dwc2_readl(hsotg, GUSBCFG); + usbcfg |= GUSBCFG_TOUTCAL(7); + dwc2_writel(hsotg, usbcfg, GUSBCFG); + + /* Restart the Phy Clock */ + dwc2_writel(hsotg, 0, PCGCTL); + + /* Initialize Host Configuration Register */ + dwc2_init_fs_ls_pclk_sel(hsotg); + if (hsotg->params.speed == DWC2_SPEED_PARAM_FULL || + hsotg->params.speed == DWC2_SPEED_PARAM_LOW) { + hcfg = dwc2_readl(hsotg, HCFG); + hcfg |= HCFG_FSLSSUPP; + dwc2_writel(hsotg, hcfg, HCFG); + } + + /* + * This bit allows dynamic reloading of the HFIR register during + * runtime. This bit needs to be programmed during initial configuration + * and its value must not be changed during runtime. + */ + if (hsotg->params.reload_ctl) { + hfir = dwc2_readl(hsotg, HFIR); + hfir |= HFIR_RLDCTRL; + dwc2_writel(hsotg, hfir, HFIR); + } + + if (hsotg->params.dma_desc_enable) { + u32 op_mode = hsotg->hw_params.op_mode; + + if (hsotg->hw_params.snpsid < DWC2_CORE_REV_2_90a || + !hsotg->hw_params.dma_desc_enable || + op_mode == GHWCFG2_OP_MODE_SRP_CAPABLE_DEVICE || + op_mode == GHWCFG2_OP_MODE_NO_SRP_CAPABLE_DEVICE || + op_mode == GHWCFG2_OP_MODE_UNDEFINED) { + dev_err(hsotg->dev, + "Hardware does not support descriptor DMA mode -\n"); + dev_err(hsotg->dev, + "falling back to buffer DMA mode.\n"); + hsotg->params.dma_desc_enable = false; + } else { + hcfg = dwc2_readl(hsotg, HCFG); + hcfg |= HCFG_DESCDMA; + dwc2_writel(hsotg, hcfg, HCFG); + } + } + + /* Configure data FIFO sizes */ + dwc2_config_fifos(hsotg); + + /* TODO - check this */ + /* Clear Host Set HNP Enable in the OTG Control Register */ + otgctl = dwc2_readl(hsotg, GOTGCTL); + otgctl &= ~GOTGCTL_HSTSETHNPEN; + dwc2_writel(hsotg, otgctl, GOTGCTL); + + /* Make sure the FIFOs are flushed */ + dwc2_flush_tx_fifo(hsotg, 0x10 /* all TX FIFOs */); + dwc2_flush_rx_fifo(hsotg); + + /* Clear Host Set HNP Enable in the OTG Control Register */ + otgctl = dwc2_readl(hsotg, GOTGCTL); + otgctl &= ~GOTGCTL_HSTSETHNPEN; + dwc2_writel(hsotg, otgctl, GOTGCTL); + + if (!hsotg->params.dma_desc_enable) { + int num_channels, i; + u32 hcchar; + + /* Flush out any leftover queued requests */ + num_channels = hsotg->params.host_channels; + for (i = 0; i < num_channels; i++) { + hcchar = dwc2_readl(hsotg, HCCHAR(i)); + if (hcchar & HCCHAR_CHENA) { + hcchar &= ~HCCHAR_CHENA; + hcchar |= HCCHAR_CHDIS; + hcchar &= ~HCCHAR_EPDIR; + dwc2_writel(hsotg, hcchar, HCCHAR(i)); + } + } + + /* Halt all channels to put them into a known state */ + for (i = 0; i < num_channels; i++) { + hcchar = dwc2_readl(hsotg, HCCHAR(i)); + if (hcchar & HCCHAR_CHENA) { + hcchar |= HCCHAR_CHENA | HCCHAR_CHDIS; + hcchar &= ~HCCHAR_EPDIR; + dwc2_writel(hsotg, hcchar, HCCHAR(i)); + dev_dbg(hsotg->dev, "%s: Halt channel %d\n", + __func__, i); + + if (dwc2_hsotg_wait_bit_clear(hsotg, HCCHAR(i), + HCCHAR_CHENA, + 1000)) { + dev_warn(hsotg->dev, + "Unable to clear enable on channel %d\n", + i); + } + } + } + } + + /* Enable ACG feature in host mode, if supported */ + dwc2_enable_acg(hsotg); + + /* Turn on the vbus power */ + dev_dbg(hsotg->dev, "Init: Port Power? op_state=%d\n", hsotg->op_state); + if (hsotg->op_state == OTG_STATE_A_HOST) { + u32 hprt0 = dwc2_read_hprt0(hsotg); + + dev_dbg(hsotg->dev, "Init: Power Port (%d)\n", + !!(hprt0 & HPRT0_PWR)); + if (!(hprt0 & HPRT0_PWR)) { + hprt0 |= HPRT0_PWR; + dwc2_writel(hsotg, hprt0, HPRT0); + } + } + + dwc2_enable_host_interrupts(hsotg); +} + +/* + * Initializes dynamic portions of the DWC_otg HCD state + * + * Must be called with interrupt disabled and spinlock held + */ +static void dwc2_hcd_reinit(struct dwc2_hsotg *hsotg) +{ + struct dwc2_host_chan *chan, *chan_tmp; + int num_channels; + int i; + + hsotg->flags.d32 = 0; + hsotg->non_periodic_qh_ptr = &hsotg->non_periodic_sched_active; + + if (hsotg->params.uframe_sched) { + hsotg->available_host_channels = + hsotg->params.host_channels; + } else { + hsotg->non_periodic_channels = 0; + hsotg->periodic_channels = 0; + } + + /* + * Put all channels in the free channel list and clean up channel + * states + */ + list_for_each_entry_safe(chan, chan_tmp, &hsotg->free_hc_list, + hc_list_entry) + list_del_init(&chan->hc_list_entry); + + num_channels = hsotg->params.host_channels; + for (i = 0; i < num_channels; i++) { + chan = hsotg->hc_ptr_array[i]; + list_add_tail(&chan->hc_list_entry, &hsotg->free_hc_list); + dwc2_hc_cleanup(hsotg, chan); + } + + /* Initialize the DWC core for host mode operation */ + dwc2_core_host_init(hsotg); +} + +static void dwc2_hc_init_split(struct dwc2_hsotg *hsotg, + struct dwc2_host_chan *chan, + struct dwc2_qtd *qtd, struct dwc2_hcd_urb *urb) +{ + int hub_addr, hub_port; + + chan->do_split = 1; + chan->xact_pos = qtd->isoc_split_pos; + chan->complete_split = qtd->complete_split; + dwc2_host_hub_info(hsotg, urb->priv, &hub_addr, &hub_port); + chan->hub_addr = (u8)hub_addr; + chan->hub_port = (u8)hub_port; +} + +static void dwc2_hc_init_xfer(struct dwc2_hsotg *hsotg, + struct dwc2_host_chan *chan, + struct dwc2_qtd *qtd) +{ + struct dwc2_hcd_urb *urb = qtd->urb; + struct dwc2_hcd_iso_packet_desc *frame_desc; + + switch (dwc2_hcd_get_pipe_type(&urb->pipe_info)) { + case USB_ENDPOINT_XFER_CONTROL: + chan->ep_type = USB_ENDPOINT_XFER_CONTROL; + + switch (qtd->control_phase) { + case DWC2_CONTROL_SETUP: + dev_vdbg(hsotg->dev, " Control setup transaction\n"); + chan->do_ping = 0; + chan->ep_is_in = 0; + chan->data_pid_start = DWC2_HC_PID_SETUP; + if (hsotg->params.host_dma) + chan->xfer_dma = urb->setup_dma; + else + chan->xfer_buf = urb->setup_packet; + chan->xfer_len = 8; + break; + + case DWC2_CONTROL_DATA: + dev_vdbg(hsotg->dev, " Control data transaction\n"); + chan->data_pid_start = qtd->data_toggle; + break; + + case DWC2_CONTROL_STATUS: + /* + * Direction is opposite of data direction or IN if no + * data + */ + dev_vdbg(hsotg->dev, " Control status transaction\n"); + if (urb->length == 0) + chan->ep_is_in = 1; + else + chan->ep_is_in = + dwc2_hcd_is_pipe_out(&urb->pipe_info); + if (chan->ep_is_in) + chan->do_ping = 0; + chan->data_pid_start = DWC2_HC_PID_DATA1; + chan->xfer_len = 0; + if (hsotg->params.host_dma) + chan->xfer_dma = hsotg->status_buf_dma; + else + chan->xfer_buf = hsotg->status_buf; + break; + } + break; + + case USB_ENDPOINT_XFER_BULK: + chan->ep_type = USB_ENDPOINT_XFER_BULK; + break; + + case USB_ENDPOINT_XFER_INT: + chan->ep_type = USB_ENDPOINT_XFER_INT; + break; + + case USB_ENDPOINT_XFER_ISOC: + chan->ep_type = USB_ENDPOINT_XFER_ISOC; + if (hsotg->params.dma_desc_enable) + break; + + frame_desc = &urb->iso_descs[qtd->isoc_frame_index]; + frame_desc->status = 0; + + if (hsotg->params.host_dma) { + chan->xfer_dma = urb->dma; + chan->xfer_dma += frame_desc->offset + + qtd->isoc_split_offset; + } else { + chan->xfer_buf = urb->buf; + chan->xfer_buf += frame_desc->offset + + qtd->isoc_split_offset; + } + + chan->xfer_len = frame_desc->length - qtd->isoc_split_offset; + + if (chan->xact_pos == DWC2_HCSPLT_XACTPOS_ALL) { + if (chan->xfer_len <= 188) + chan->xact_pos = DWC2_HCSPLT_XACTPOS_ALL; + else + chan->xact_pos = DWC2_HCSPLT_XACTPOS_BEGIN; + } + break; + } +} + +static int dwc2_alloc_split_dma_aligned_buf(struct dwc2_hsotg *hsotg, + struct dwc2_qh *qh, + struct dwc2_host_chan *chan) +{ + if (!hsotg->unaligned_cache || + chan->max_packet > DWC2_KMEM_UNALIGNED_BUF_SIZE) + return -ENOMEM; + + if (!qh->dw_align_buf) { + qh->dw_align_buf = kmem_cache_alloc(hsotg->unaligned_cache, + GFP_ATOMIC | GFP_DMA); + if (!qh->dw_align_buf) + return -ENOMEM; + } + + qh->dw_align_buf_dma = dma_map_single(hsotg->dev, qh->dw_align_buf, + DWC2_KMEM_UNALIGNED_BUF_SIZE, + DMA_FROM_DEVICE); + + if (dma_mapping_error(hsotg->dev, qh->dw_align_buf_dma)) { + dev_err(hsotg->dev, "can't map align_buf\n"); + chan->align_buf = 0; + return -EINVAL; + } + + chan->align_buf = qh->dw_align_buf_dma; + return 0; +} + +#define DWC2_USB_DMA_ALIGN 4 + +static void dwc2_free_dma_aligned_buffer(struct urb *urb) +{ + void *stored_xfer_buffer; + size_t length; + + if (!(urb->transfer_flags & URB_ALIGNED_TEMP_BUFFER)) + return; + + /* Restore urb->transfer_buffer from the end of the allocated area */ + memcpy(&stored_xfer_buffer, + PTR_ALIGN(urb->transfer_buffer + urb->transfer_buffer_length, + dma_get_cache_alignment()), + sizeof(urb->transfer_buffer)); + + if (usb_urb_dir_in(urb)) { + if (usb_pipeisoc(urb->pipe)) + length = urb->transfer_buffer_length; + else + length = urb->actual_length; + + memcpy(stored_xfer_buffer, urb->transfer_buffer, length); + } + kfree(urb->transfer_buffer); + urb->transfer_buffer = stored_xfer_buffer; + + urb->transfer_flags &= ~URB_ALIGNED_TEMP_BUFFER; +} + +static int dwc2_alloc_dma_aligned_buffer(struct urb *urb, gfp_t mem_flags) +{ + void *kmalloc_ptr; + size_t kmalloc_size; + + if (urb->num_sgs || urb->sg || + urb->transfer_buffer_length == 0 || + !((uintptr_t)urb->transfer_buffer & (DWC2_USB_DMA_ALIGN - 1))) + return 0; + + /* + * Allocate a buffer with enough padding for original transfer_buffer + * pointer. This allocation is guaranteed to be aligned properly for + * DMA + */ + kmalloc_size = urb->transfer_buffer_length + + (dma_get_cache_alignment() - 1) + + sizeof(urb->transfer_buffer); + + kmalloc_ptr = kmalloc(kmalloc_size, mem_flags); + if (!kmalloc_ptr) + return -ENOMEM; + + /* + * Position value of original urb->transfer_buffer pointer to the end + * of allocation for later referencing + */ + memcpy(PTR_ALIGN(kmalloc_ptr + urb->transfer_buffer_length, + dma_get_cache_alignment()), + &urb->transfer_buffer, sizeof(urb->transfer_buffer)); + + if (usb_urb_dir_out(urb)) + memcpy(kmalloc_ptr, urb->transfer_buffer, + urb->transfer_buffer_length); + urb->transfer_buffer = kmalloc_ptr; + + urb->transfer_flags |= URB_ALIGNED_TEMP_BUFFER; + + return 0; +} + +static int dwc2_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb, + gfp_t mem_flags) +{ + int ret; + + /* We assume setup_dma is always aligned; warn if not */ + WARN_ON_ONCE(urb->setup_dma && + (urb->setup_dma & (DWC2_USB_DMA_ALIGN - 1))); + + ret = dwc2_alloc_dma_aligned_buffer(urb, mem_flags); + if (ret) + return ret; + + ret = usb_hcd_map_urb_for_dma(hcd, urb, mem_flags); + if (ret) + dwc2_free_dma_aligned_buffer(urb); + + return ret; +} + +static void dwc2_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb) +{ + usb_hcd_unmap_urb_for_dma(hcd, urb); + dwc2_free_dma_aligned_buffer(urb); +} + +/** + * dwc2_assign_and_init_hc() - Assigns transactions from a QTD to a free host + * channel and initializes the host channel to perform the transactions. The + * host channel is removed from the free list. + * + * @hsotg: The HCD state structure + * @qh: Transactions from the first QTD for this QH are selected and assigned + * to a free host channel + */ +static int dwc2_assign_and_init_hc(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh) +{ + struct dwc2_host_chan *chan; + struct dwc2_hcd_urb *urb; + struct dwc2_qtd *qtd; + + if (dbg_qh(qh)) + dev_vdbg(hsotg->dev, "%s(%p,%p)\n", __func__, hsotg, qh); + + if (list_empty(&qh->qtd_list)) { + dev_dbg(hsotg->dev, "No QTDs in QH list\n"); + return -ENOMEM; + } + + if (list_empty(&hsotg->free_hc_list)) { + dev_dbg(hsotg->dev, "No free channel to assign\n"); + return -ENOMEM; + } + + chan = list_first_entry(&hsotg->free_hc_list, struct dwc2_host_chan, + hc_list_entry); + + /* Remove host channel from free list */ + list_del_init(&chan->hc_list_entry); + + qtd = list_first_entry(&qh->qtd_list, struct dwc2_qtd, qtd_list_entry); + urb = qtd->urb; + qh->channel = chan; + qtd->in_process = 1; + + /* + * Use usb_pipedevice to determine device address. This address is + * 0 before the SET_ADDRESS command and the correct address afterward. + */ + chan->dev_addr = dwc2_hcd_get_dev_addr(&urb->pipe_info); + chan->ep_num = dwc2_hcd_get_ep_num(&urb->pipe_info); + chan->speed = qh->dev_speed; + chan->max_packet = qh->maxp; + + chan->xfer_started = 0; + chan->halt_status = DWC2_HC_XFER_NO_HALT_STATUS; + chan->error_state = (qtd->error_count > 0); + chan->halt_on_queue = 0; + chan->halt_pending = 0; + chan->requests = 0; + + /* + * The following values may be modified in the transfer type section + * below. The xfer_len value may be reduced when the transfer is + * started to accommodate the max widths of the XferSize and PktCnt + * fields in the HCTSIZn register. + */ + + chan->ep_is_in = (dwc2_hcd_is_pipe_in(&urb->pipe_info) != 0); + if (chan->ep_is_in) + chan->do_ping = 0; + else + chan->do_ping = qh->ping_state; + + chan->data_pid_start = qh->data_toggle; + chan->multi_count = 1; + + if (urb->actual_length > urb->length && + !dwc2_hcd_is_pipe_in(&urb->pipe_info)) + urb->actual_length = urb->length; + + if (hsotg->params.host_dma) + chan->xfer_dma = urb->dma + urb->actual_length; + else + chan->xfer_buf = (u8 *)urb->buf + urb->actual_length; + + chan->xfer_len = urb->length - urb->actual_length; + chan->xfer_count = 0; + + /* Set the split attributes if required */ + if (qh->do_split) + dwc2_hc_init_split(hsotg, chan, qtd, urb); + else + chan->do_split = 0; + + /* Set the transfer attributes */ + dwc2_hc_init_xfer(hsotg, chan, qtd); + + /* For non-dword aligned buffers */ + if (hsotg->params.host_dma && qh->do_split && + chan->ep_is_in && (chan->xfer_dma & 0x3)) { + dev_vdbg(hsotg->dev, "Non-aligned buffer\n"); + if (dwc2_alloc_split_dma_aligned_buf(hsotg, qh, chan)) { + dev_err(hsotg->dev, + "Failed to allocate memory to handle non-aligned buffer\n"); + /* Add channel back to free list */ + chan->align_buf = 0; + chan->multi_count = 0; + list_add_tail(&chan->hc_list_entry, + &hsotg->free_hc_list); + qtd->in_process = 0; + qh->channel = NULL; + return -ENOMEM; + } + } else { + /* + * We assume that DMA is always aligned in non-split + * case or split out case. Warn if not. + */ + WARN_ON_ONCE(hsotg->params.host_dma && + (chan->xfer_dma & 0x3)); + chan->align_buf = 0; + } + + if (chan->ep_type == USB_ENDPOINT_XFER_INT || + chan->ep_type == USB_ENDPOINT_XFER_ISOC) + /* + * This value may be modified when the transfer is started + * to reflect the actual transfer length + */ + chan->multi_count = qh->maxp_mult; + + if (hsotg->params.dma_desc_enable) { + chan->desc_list_addr = qh->desc_list_dma; + chan->desc_list_sz = qh->desc_list_sz; + } + + dwc2_hc_init(hsotg, chan); + chan->qh = qh; + + return 0; +} + +/** + * dwc2_hcd_select_transactions() - Selects transactions from the HCD transfer + * schedule and assigns them to available host channels. Called from the HCD + * interrupt handler functions. + * + * @hsotg: The HCD state structure + * + * Return: The types of new transactions that were assigned to host channels + */ +enum dwc2_transaction_type dwc2_hcd_select_transactions( + struct dwc2_hsotg *hsotg) +{ + enum dwc2_transaction_type ret_val = DWC2_TRANSACTION_NONE; + struct list_head *qh_ptr; + struct dwc2_qh *qh; + int num_channels; + +#ifdef DWC2_DEBUG_SOF + dev_vdbg(hsotg->dev, " Select Transactions\n"); +#endif + + /* Process entries in the periodic ready list */ + qh_ptr = hsotg->periodic_sched_ready.next; + while (qh_ptr != &hsotg->periodic_sched_ready) { + if (list_empty(&hsotg->free_hc_list)) + break; + if (hsotg->params.uframe_sched) { + if (hsotg->available_host_channels <= 1) + break; + hsotg->available_host_channels--; + } + qh = list_entry(qh_ptr, struct dwc2_qh, qh_list_entry); + if (dwc2_assign_and_init_hc(hsotg, qh)) + break; + + /* + * Move the QH from the periodic ready schedule to the + * periodic assigned schedule + */ + qh_ptr = qh_ptr->next; + list_move_tail(&qh->qh_list_entry, + &hsotg->periodic_sched_assigned); + ret_val = DWC2_TRANSACTION_PERIODIC; + } + + /* + * Process entries in the inactive portion of the non-periodic + * schedule. Some free host channels may not be used if they are + * reserved for periodic transfers. + */ + num_channels = hsotg->params.host_channels; + qh_ptr = hsotg->non_periodic_sched_inactive.next; + while (qh_ptr != &hsotg->non_periodic_sched_inactive) { + if (!hsotg->params.uframe_sched && + hsotg->non_periodic_channels >= num_channels - + hsotg->periodic_channels) + break; + if (list_empty(&hsotg->free_hc_list)) + break; + qh = list_entry(qh_ptr, struct dwc2_qh, qh_list_entry); + if (hsotg->params.uframe_sched) { + if (hsotg->available_host_channels < 1) + break; + hsotg->available_host_channels--; + } + + if (dwc2_assign_and_init_hc(hsotg, qh)) + break; + + /* + * Move the QH from the non-periodic inactive schedule to the + * non-periodic active schedule + */ + qh_ptr = qh_ptr->next; + list_move_tail(&qh->qh_list_entry, + &hsotg->non_periodic_sched_active); + + if (ret_val == DWC2_TRANSACTION_NONE) + ret_val = DWC2_TRANSACTION_NON_PERIODIC; + else + ret_val = DWC2_TRANSACTION_ALL; + + if (!hsotg->params.uframe_sched) + hsotg->non_periodic_channels++; + } + + return ret_val; +} + +/** + * dwc2_queue_transaction() - Attempts to queue a single transaction request for + * a host channel associated with either a periodic or non-periodic transfer + * + * @hsotg: The HCD state structure + * @chan: Host channel descriptor associated with either a periodic or + * non-periodic transfer + * @fifo_dwords_avail: Number of DWORDs available in the periodic Tx FIFO + * for periodic transfers or the non-periodic Tx FIFO + * for non-periodic transfers + * + * Return: 1 if a request is queued and more requests may be needed to + * complete the transfer, 0 if no more requests are required for this + * transfer, -1 if there is insufficient space in the Tx FIFO + * + * This function assumes that there is space available in the appropriate + * request queue. For an OUT transfer or SETUP transaction in Slave mode, + * it checks whether space is available in the appropriate Tx FIFO. + * + * Must be called with interrupt disabled and spinlock held + */ +static int dwc2_queue_transaction(struct dwc2_hsotg *hsotg, + struct dwc2_host_chan *chan, + u16 fifo_dwords_avail) +{ + int retval = 0; + + if (chan->do_split) + /* Put ourselves on the list to keep order straight */ + list_move_tail(&chan->split_order_list_entry, + &hsotg->split_order); + + if (hsotg->params.host_dma && chan->qh) { + if (hsotg->params.dma_desc_enable) { + if (!chan->xfer_started || + chan->ep_type == USB_ENDPOINT_XFER_ISOC) { + dwc2_hcd_start_xfer_ddma(hsotg, chan->qh); + chan->qh->ping_state = 0; + } + } else if (!chan->xfer_started) { + dwc2_hc_start_transfer(hsotg, chan); + chan->qh->ping_state = 0; + } + } else if (chan->halt_pending) { + /* Don't queue a request if the channel has been halted */ + } else if (chan->halt_on_queue) { + dwc2_hc_halt(hsotg, chan, chan->halt_status); + } else if (chan->do_ping) { + if (!chan->xfer_started) + dwc2_hc_start_transfer(hsotg, chan); + } else if (!chan->ep_is_in || + chan->data_pid_start == DWC2_HC_PID_SETUP) { + if ((fifo_dwords_avail * 4) >= chan->max_packet) { + if (!chan->xfer_started) { + dwc2_hc_start_transfer(hsotg, chan); + retval = 1; + } else { + retval = dwc2_hc_continue_transfer(hsotg, chan); + } + } else { + retval = -1; + } + } else { + if (!chan->xfer_started) { + dwc2_hc_start_transfer(hsotg, chan); + retval = 1; + } else { + retval = dwc2_hc_continue_transfer(hsotg, chan); + } + } + + return retval; +} + +/* + * Processes periodic channels for the next frame and queues transactions for + * these channels to the DWC_otg controller. After queueing transactions, the + * Periodic Tx FIFO Empty interrupt is enabled if there are more transactions + * to queue as Periodic Tx FIFO or request queue space becomes available. + * Otherwise, the Periodic Tx FIFO Empty interrupt is disabled. + * + * Must be called with interrupt disabled and spinlock held + */ +static void dwc2_process_periodic_channels(struct dwc2_hsotg *hsotg) +{ + struct list_head *qh_ptr; + struct dwc2_qh *qh; + u32 tx_status; + u32 fspcavail; + u32 gintmsk; + int status; + bool no_queue_space = false; + bool no_fifo_space = false; + u32 qspcavail; + + /* If empty list then just adjust interrupt enables */ + if (list_empty(&hsotg->periodic_sched_assigned)) + goto exit; + + if (dbg_perio()) + dev_vdbg(hsotg->dev, "Queue periodic transactions\n"); + + tx_status = dwc2_readl(hsotg, HPTXSTS); + qspcavail = (tx_status & TXSTS_QSPCAVAIL_MASK) >> + TXSTS_QSPCAVAIL_SHIFT; + fspcavail = (tx_status & TXSTS_FSPCAVAIL_MASK) >> + TXSTS_FSPCAVAIL_SHIFT; + + if (dbg_perio()) { + dev_vdbg(hsotg->dev, " P Tx Req Queue Space Avail (before queue): %d\n", + qspcavail); + dev_vdbg(hsotg->dev, " P Tx FIFO Space Avail (before queue): %d\n", + fspcavail); + } + + qh_ptr = hsotg->periodic_sched_assigned.next; + while (qh_ptr != &hsotg->periodic_sched_assigned) { + tx_status = dwc2_readl(hsotg, HPTXSTS); + qspcavail = (tx_status & TXSTS_QSPCAVAIL_MASK) >> + TXSTS_QSPCAVAIL_SHIFT; + if (qspcavail == 0) { + no_queue_space = true; + break; + } + + qh = list_entry(qh_ptr, struct dwc2_qh, qh_list_entry); + if (!qh->channel) { + qh_ptr = qh_ptr->next; + continue; + } + + /* Make sure EP's TT buffer is clean before queueing qtds */ + if (qh->tt_buffer_dirty) { + qh_ptr = qh_ptr->next; + continue; + } + + /* + * Set a flag if we're queuing high-bandwidth in slave mode. + * The flag prevents any halts to get into the request queue in + * the middle of multiple high-bandwidth packets getting queued. + */ + if (!hsotg->params.host_dma && + qh->channel->multi_count > 1) + hsotg->queuing_high_bandwidth = 1; + + fspcavail = (tx_status & TXSTS_FSPCAVAIL_MASK) >> + TXSTS_FSPCAVAIL_SHIFT; + status = dwc2_queue_transaction(hsotg, qh->channel, fspcavail); + if (status < 0) { + no_fifo_space = true; + break; + } + + /* + * In Slave mode, stay on the current transfer until there is + * nothing more to do or the high-bandwidth request count is + * reached. In DMA mode, only need to queue one request. The + * controller automatically handles multiple packets for + * high-bandwidth transfers. + */ + if (hsotg->params.host_dma || status == 0 || + qh->channel->requests == qh->channel->multi_count) { + qh_ptr = qh_ptr->next; + /* + * Move the QH from the periodic assigned schedule to + * the periodic queued schedule + */ + list_move_tail(&qh->qh_list_entry, + &hsotg->periodic_sched_queued); + + /* done queuing high bandwidth */ + hsotg->queuing_high_bandwidth = 0; + } + } + +exit: + if (no_queue_space || no_fifo_space || + (!hsotg->params.host_dma && + !list_empty(&hsotg->periodic_sched_assigned))) { + /* + * May need to queue more transactions as the request + * queue or Tx FIFO empties. Enable the periodic Tx + * FIFO empty interrupt. (Always use the half-empty + * level to ensure that new requests are loaded as + * soon as possible.) + */ + gintmsk = dwc2_readl(hsotg, GINTMSK); + if (!(gintmsk & GINTSTS_PTXFEMP)) { + gintmsk |= GINTSTS_PTXFEMP; + dwc2_writel(hsotg, gintmsk, GINTMSK); + } + } else { + /* + * Disable the Tx FIFO empty interrupt since there are + * no more transactions that need to be queued right + * now. This function is called from interrupt + * handlers to queue more transactions as transfer + * states change. + */ + gintmsk = dwc2_readl(hsotg, GINTMSK); + if (gintmsk & GINTSTS_PTXFEMP) { + gintmsk &= ~GINTSTS_PTXFEMP; + dwc2_writel(hsotg, gintmsk, GINTMSK); + } + } +} + +/* + * Processes active non-periodic channels and queues transactions for these + * channels to the DWC_otg controller. After queueing transactions, the NP Tx + * FIFO Empty interrupt is enabled if there are more transactions to queue as + * NP Tx FIFO or request queue space becomes available. Otherwise, the NP Tx + * FIFO Empty interrupt is disabled. + * + * Must be called with interrupt disabled and spinlock held + */ +static void dwc2_process_non_periodic_channels(struct dwc2_hsotg *hsotg) +{ + struct list_head *orig_qh_ptr; + struct dwc2_qh *qh; + u32 tx_status; + u32 qspcavail; + u32 fspcavail; + u32 gintmsk; + int status; + int no_queue_space = 0; + int no_fifo_space = 0; + int more_to_do = 0; + + dev_vdbg(hsotg->dev, "Queue non-periodic transactions\n"); + + tx_status = dwc2_readl(hsotg, GNPTXSTS); + qspcavail = (tx_status & TXSTS_QSPCAVAIL_MASK) >> + TXSTS_QSPCAVAIL_SHIFT; + fspcavail = (tx_status & TXSTS_FSPCAVAIL_MASK) >> + TXSTS_FSPCAVAIL_SHIFT; + dev_vdbg(hsotg->dev, " NP Tx Req Queue Space Avail (before queue): %d\n", + qspcavail); + dev_vdbg(hsotg->dev, " NP Tx FIFO Space Avail (before queue): %d\n", + fspcavail); + + /* + * Keep track of the starting point. Skip over the start-of-list + * entry. + */ + if (hsotg->non_periodic_qh_ptr == &hsotg->non_periodic_sched_active) + hsotg->non_periodic_qh_ptr = hsotg->non_periodic_qh_ptr->next; + orig_qh_ptr = hsotg->non_periodic_qh_ptr; + + /* + * Process once through the active list or until no more space is + * available in the request queue or the Tx FIFO + */ + do { + tx_status = dwc2_readl(hsotg, GNPTXSTS); + qspcavail = (tx_status & TXSTS_QSPCAVAIL_MASK) >> + TXSTS_QSPCAVAIL_SHIFT; + if (!hsotg->params.host_dma && qspcavail == 0) { + no_queue_space = 1; + break; + } + + qh = list_entry(hsotg->non_periodic_qh_ptr, struct dwc2_qh, + qh_list_entry); + if (!qh->channel) + goto next; + + /* Make sure EP's TT buffer is clean before queueing qtds */ + if (qh->tt_buffer_dirty) + goto next; + + fspcavail = (tx_status & TXSTS_FSPCAVAIL_MASK) >> + TXSTS_FSPCAVAIL_SHIFT; + status = dwc2_queue_transaction(hsotg, qh->channel, fspcavail); + + if (status > 0) { + more_to_do = 1; + } else if (status < 0) { + no_fifo_space = 1; + break; + } +next: + /* Advance to next QH, skipping start-of-list entry */ + hsotg->non_periodic_qh_ptr = hsotg->non_periodic_qh_ptr->next; + if (hsotg->non_periodic_qh_ptr == + &hsotg->non_periodic_sched_active) + hsotg->non_periodic_qh_ptr = + hsotg->non_periodic_qh_ptr->next; + } while (hsotg->non_periodic_qh_ptr != orig_qh_ptr); + + if (!hsotg->params.host_dma) { + tx_status = dwc2_readl(hsotg, GNPTXSTS); + qspcavail = (tx_status & TXSTS_QSPCAVAIL_MASK) >> + TXSTS_QSPCAVAIL_SHIFT; + fspcavail = (tx_status & TXSTS_FSPCAVAIL_MASK) >> + TXSTS_FSPCAVAIL_SHIFT; + dev_vdbg(hsotg->dev, + " NP Tx Req Queue Space Avail (after queue): %d\n", + qspcavail); + dev_vdbg(hsotg->dev, + " NP Tx FIFO Space Avail (after queue): %d\n", + fspcavail); + + if (more_to_do || no_queue_space || no_fifo_space) { + /* + * May need to queue more transactions as the request + * queue or Tx FIFO empties. Enable the non-periodic + * Tx FIFO empty interrupt. (Always use the half-empty + * level to ensure that new requests are loaded as + * soon as possible.) + */ + gintmsk = dwc2_readl(hsotg, GINTMSK); + gintmsk |= GINTSTS_NPTXFEMP; + dwc2_writel(hsotg, gintmsk, GINTMSK); + } else { + /* + * Disable the Tx FIFO empty interrupt since there are + * no more transactions that need to be queued right + * now. This function is called from interrupt + * handlers to queue more transactions as transfer + * states change. + */ + gintmsk = dwc2_readl(hsotg, GINTMSK); + gintmsk &= ~GINTSTS_NPTXFEMP; + dwc2_writel(hsotg, gintmsk, GINTMSK); + } + } +} + +/** + * dwc2_hcd_queue_transactions() - Processes the currently active host channels + * and queues transactions for these channels to the DWC_otg controller. Called + * from the HCD interrupt handler functions. + * + * @hsotg: The HCD state structure + * @tr_type: The type(s) of transactions to queue (non-periodic, periodic, + * or both) + * + * Must be called with interrupt disabled and spinlock held + */ +void dwc2_hcd_queue_transactions(struct dwc2_hsotg *hsotg, + enum dwc2_transaction_type tr_type) +{ +#ifdef DWC2_DEBUG_SOF + dev_vdbg(hsotg->dev, "Queue Transactions\n"); +#endif + /* Process host channels associated with periodic transfers */ + if (tr_type == DWC2_TRANSACTION_PERIODIC || + tr_type == DWC2_TRANSACTION_ALL) + dwc2_process_periodic_channels(hsotg); + + /* Process host channels associated with non-periodic transfers */ + if (tr_type == DWC2_TRANSACTION_NON_PERIODIC || + tr_type == DWC2_TRANSACTION_ALL) { + if (!list_empty(&hsotg->non_periodic_sched_active)) { + dwc2_process_non_periodic_channels(hsotg); + } else { + /* + * Ensure NP Tx FIFO empty interrupt is disabled when + * there are no non-periodic transfers to process + */ + u32 gintmsk = dwc2_readl(hsotg, GINTMSK); + + gintmsk &= ~GINTSTS_NPTXFEMP; + dwc2_writel(hsotg, gintmsk, GINTMSK); + } + } +} + +static void dwc2_conn_id_status_change(struct work_struct *work) +{ + struct dwc2_hsotg *hsotg = container_of(work, struct dwc2_hsotg, + wf_otg); + u32 count = 0; + u32 gotgctl; + unsigned long flags; + + dev_dbg(hsotg->dev, "%s()\n", __func__); + + gotgctl = dwc2_readl(hsotg, GOTGCTL); + dev_dbg(hsotg->dev, "gotgctl=%0x\n", gotgctl); + dev_dbg(hsotg->dev, "gotgctl.b.conidsts=%d\n", + !!(gotgctl & GOTGCTL_CONID_B)); + + /* B-Device connector (Device Mode) */ + if (gotgctl & GOTGCTL_CONID_B) { + dwc2_vbus_supply_exit(hsotg); + /* Wait for switch to device mode */ + dev_dbg(hsotg->dev, "connId B\n"); + if (hsotg->bus_suspended) { + dev_info(hsotg->dev, + "Do port resume before switching to device mode\n"); + dwc2_port_resume(hsotg); + } + while (!dwc2_is_device_mode(hsotg)) { + dev_info(hsotg->dev, + "Waiting for Peripheral Mode, Mode=%s\n", + dwc2_is_host_mode(hsotg) ? "Host" : + "Peripheral"); + msleep(20); + /* + * Sometimes the initial GOTGCTRL read is wrong, so + * check it again and jump to host mode if that was + * the case. + */ + gotgctl = dwc2_readl(hsotg, GOTGCTL); + if (!(gotgctl & GOTGCTL_CONID_B)) + goto host; + if (++count > 250) + break; + } + if (count > 250) + dev_err(hsotg->dev, + "Connection id status change timed out\n"); + + /* + * Exit Partial Power Down without restoring registers. + * No need to check the return value as registers + * are not being restored. + */ + if (hsotg->in_ppd && hsotg->lx_state == DWC2_L2) + dwc2_exit_partial_power_down(hsotg, 0, false); + + hsotg->op_state = OTG_STATE_B_PERIPHERAL; + dwc2_core_init(hsotg, false); + dwc2_enable_global_interrupts(hsotg); + spin_lock_irqsave(&hsotg->lock, flags); + dwc2_hsotg_core_init_disconnected(hsotg, false); + spin_unlock_irqrestore(&hsotg->lock, flags); + /* Enable ACG feature in device mode,if supported */ + dwc2_enable_acg(hsotg); + dwc2_hsotg_core_connect(hsotg); + } else { +host: + /* A-Device connector (Host Mode) */ + dev_dbg(hsotg->dev, "connId A\n"); + while (!dwc2_is_host_mode(hsotg)) { + dev_info(hsotg->dev, "Waiting for Host Mode, Mode=%s\n", + dwc2_is_host_mode(hsotg) ? + "Host" : "Peripheral"); + msleep(20); + if (++count > 250) + break; + } + if (count > 250) + dev_err(hsotg->dev, + "Connection id status change timed out\n"); + + spin_lock_irqsave(&hsotg->lock, flags); + dwc2_hsotg_disconnect(hsotg); + spin_unlock_irqrestore(&hsotg->lock, flags); + + hsotg->op_state = OTG_STATE_A_HOST; + /* Initialize the Core for Host mode */ + dwc2_core_init(hsotg, false); + dwc2_enable_global_interrupts(hsotg); + dwc2_hcd_start(hsotg); + } +} + +static void dwc2_wakeup_detected(struct timer_list *t) +{ + struct dwc2_hsotg *hsotg = from_timer(hsotg, t, wkp_timer); + u32 hprt0; + + dev_dbg(hsotg->dev, "%s()\n", __func__); + + /* + * Clear the Resume after 70ms. (Need 20 ms minimum. Use 70 ms + * so that OPT tests pass with all PHYs.) + */ + hprt0 = dwc2_read_hprt0(hsotg); + dev_dbg(hsotg->dev, "Resume: HPRT0=%0x\n", hprt0); + hprt0 &= ~HPRT0_RES; + dwc2_writel(hsotg, hprt0, HPRT0); + dev_dbg(hsotg->dev, "Clear Resume: HPRT0=%0x\n", + dwc2_readl(hsotg, HPRT0)); + + dwc2_hcd_rem_wakeup(hsotg); + hsotg->bus_suspended = false; + + /* Change to L0 state */ + hsotg->lx_state = DWC2_L0; +} + +static int dwc2_host_is_b_hnp_enabled(struct dwc2_hsotg *hsotg) +{ + struct usb_hcd *hcd = dwc2_hsotg_to_hcd(hsotg); + + return hcd->self.b_hnp_enable; +} + +/** + * dwc2_port_suspend() - Put controller in suspend mode for host. + * + * @hsotg: Programming view of the DWC_otg controller + * @windex: The control request wIndex field + * + * Return: non-zero if failed to enter suspend mode for host. + * + * This function is for entering Host mode suspend. + * Must NOT be called with interrupt disabled or spinlock held. + */ +int dwc2_port_suspend(struct dwc2_hsotg *hsotg, u16 windex) +{ + unsigned long flags; + u32 pcgctl; + u32 gotgctl; + int ret = 0; + + dev_dbg(hsotg->dev, "%s()\n", __func__); + + spin_lock_irqsave(&hsotg->lock, flags); + + if (windex == hsotg->otg_port && dwc2_host_is_b_hnp_enabled(hsotg)) { + gotgctl = dwc2_readl(hsotg, GOTGCTL); + gotgctl |= GOTGCTL_HSTSETHNPEN; + dwc2_writel(hsotg, gotgctl, GOTGCTL); + hsotg->op_state = OTG_STATE_A_SUSPEND; + } + + switch (hsotg->params.power_down) { + case DWC2_POWER_DOWN_PARAM_PARTIAL: + ret = dwc2_enter_partial_power_down(hsotg); + if (ret) + dev_err(hsotg->dev, + "enter partial_power_down failed.\n"); + break; + case DWC2_POWER_DOWN_PARAM_HIBERNATION: + /* + * Perform spin unlock and lock because in + * "dwc2_host_enter_hibernation()" function there is a spinlock + * logic which prevents servicing of any IRQ during entering + * hibernation. + */ + spin_unlock_irqrestore(&hsotg->lock, flags); + ret = dwc2_enter_hibernation(hsotg, 1); + if (ret) + dev_err(hsotg->dev, "enter hibernation failed.\n"); + spin_lock_irqsave(&hsotg->lock, flags); + break; + case DWC2_POWER_DOWN_PARAM_NONE: + /* + * If not hibernation nor partial power down are supported, + * clock gating is used to save power. + */ + if (!hsotg->params.no_clock_gating) + dwc2_host_enter_clock_gating(hsotg); + break; + } + + /* For HNP the bus must be suspended for at least 200ms */ + if (dwc2_host_is_b_hnp_enabled(hsotg)) { + pcgctl = dwc2_readl(hsotg, PCGCTL); + pcgctl &= ~PCGCTL_STOPPCLK; + dwc2_writel(hsotg, pcgctl, PCGCTL); + + spin_unlock_irqrestore(&hsotg->lock, flags); + + msleep(200); + } else { + spin_unlock_irqrestore(&hsotg->lock, flags); + } + + return ret; +} + +/** + * dwc2_port_resume() - Exit controller from suspend mode for host. + * + * @hsotg: Programming view of the DWC_otg controller + * + * Return: non-zero if failed to exit suspend mode for host. + * + * This function is for exiting Host mode suspend. + * Must NOT be called with interrupt disabled or spinlock held. + */ +int dwc2_port_resume(struct dwc2_hsotg *hsotg) +{ + unsigned long flags; + int ret = 0; + + spin_lock_irqsave(&hsotg->lock, flags); + + switch (hsotg->params.power_down) { + case DWC2_POWER_DOWN_PARAM_PARTIAL: + ret = dwc2_exit_partial_power_down(hsotg, 0, true); + if (ret) + dev_err(hsotg->dev, + "exit partial_power_down failed.\n"); + break; + case DWC2_POWER_DOWN_PARAM_HIBERNATION: + /* Exit host hibernation. */ + ret = dwc2_exit_hibernation(hsotg, 0, 0, 1); + if (ret) + dev_err(hsotg->dev, "exit hibernation failed.\n"); + break; + case DWC2_POWER_DOWN_PARAM_NONE: + /* + * If not hibernation nor partial power down are supported, + * port resume is done using the clock gating programming flow. + */ + spin_unlock_irqrestore(&hsotg->lock, flags); + dwc2_host_exit_clock_gating(hsotg, 0); + spin_lock_irqsave(&hsotg->lock, flags); + break; + } + + spin_unlock_irqrestore(&hsotg->lock, flags); + + return ret; +} + +/* Handles hub class-specific requests */ +static int dwc2_hcd_hub_control(struct dwc2_hsotg *hsotg, u16 typereq, + u16 wvalue, u16 windex, char *buf, u16 wlength) +{ + struct usb_hub_descriptor *hub_desc; + int retval = 0; + u32 hprt0; + u32 port_status; + u32 speed; + u32 pcgctl; + u32 pwr; + + switch (typereq) { + case ClearHubFeature: + dev_dbg(hsotg->dev, "ClearHubFeature %1xh\n", wvalue); + + switch (wvalue) { + case C_HUB_LOCAL_POWER: + case C_HUB_OVER_CURRENT: + /* Nothing required here */ + break; + + default: + retval = -EINVAL; + dev_err(hsotg->dev, + "ClearHubFeature request %1xh unknown\n", + wvalue); + } + break; + + case ClearPortFeature: + if (wvalue != USB_PORT_FEAT_L1) + if (!windex || windex > 1) + goto error; + switch (wvalue) { + case USB_PORT_FEAT_ENABLE: + dev_dbg(hsotg->dev, + "ClearPortFeature USB_PORT_FEAT_ENABLE\n"); + hprt0 = dwc2_read_hprt0(hsotg); + hprt0 |= HPRT0_ENA; + dwc2_writel(hsotg, hprt0, HPRT0); + break; + + case USB_PORT_FEAT_SUSPEND: + dev_dbg(hsotg->dev, + "ClearPortFeature USB_PORT_FEAT_SUSPEND\n"); + + if (hsotg->bus_suspended) + retval = dwc2_port_resume(hsotg); + break; + + case USB_PORT_FEAT_POWER: + dev_dbg(hsotg->dev, + "ClearPortFeature USB_PORT_FEAT_POWER\n"); + hprt0 = dwc2_read_hprt0(hsotg); + pwr = hprt0 & HPRT0_PWR; + hprt0 &= ~HPRT0_PWR; + dwc2_writel(hsotg, hprt0, HPRT0); + if (pwr) + dwc2_vbus_supply_exit(hsotg); + break; + + case USB_PORT_FEAT_INDICATOR: + dev_dbg(hsotg->dev, + "ClearPortFeature USB_PORT_FEAT_INDICATOR\n"); + /* Port indicator not supported */ + break; + + case USB_PORT_FEAT_C_CONNECTION: + /* + * Clears driver's internal Connect Status Change flag + */ + dev_dbg(hsotg->dev, + "ClearPortFeature USB_PORT_FEAT_C_CONNECTION\n"); + hsotg->flags.b.port_connect_status_change = 0; + break; + + case USB_PORT_FEAT_C_RESET: + /* Clears driver's internal Port Reset Change flag */ + dev_dbg(hsotg->dev, + "ClearPortFeature USB_PORT_FEAT_C_RESET\n"); + hsotg->flags.b.port_reset_change = 0; + break; + + case USB_PORT_FEAT_C_ENABLE: + /* + * Clears the driver's internal Port Enable/Disable + * Change flag + */ + dev_dbg(hsotg->dev, + "ClearPortFeature USB_PORT_FEAT_C_ENABLE\n"); + hsotg->flags.b.port_enable_change = 0; + break; + + case USB_PORT_FEAT_C_SUSPEND: + /* + * Clears the driver's internal Port Suspend Change + * flag, which is set when resume signaling on the host + * port is complete + */ + dev_dbg(hsotg->dev, + "ClearPortFeature USB_PORT_FEAT_C_SUSPEND\n"); + hsotg->flags.b.port_suspend_change = 0; + break; + + case USB_PORT_FEAT_C_PORT_L1: + dev_dbg(hsotg->dev, + "ClearPortFeature USB_PORT_FEAT_C_PORT_L1\n"); + hsotg->flags.b.port_l1_change = 0; + break; + + case USB_PORT_FEAT_C_OVER_CURRENT: + dev_dbg(hsotg->dev, + "ClearPortFeature USB_PORT_FEAT_C_OVER_CURRENT\n"); + hsotg->flags.b.port_over_current_change = 0; + break; + + default: + retval = -EINVAL; + dev_err(hsotg->dev, + "ClearPortFeature request %1xh unknown or unsupported\n", + wvalue); + } + break; + + case GetHubDescriptor: + dev_dbg(hsotg->dev, "GetHubDescriptor\n"); + hub_desc = (struct usb_hub_descriptor *)buf; + hub_desc->bDescLength = 9; + hub_desc->bDescriptorType = USB_DT_HUB; + hub_desc->bNbrPorts = 1; + hub_desc->wHubCharacteristics = + cpu_to_le16(HUB_CHAR_COMMON_LPSM | + HUB_CHAR_INDV_PORT_OCPM); + hub_desc->bPwrOn2PwrGood = 1; + hub_desc->bHubContrCurrent = 0; + hub_desc->u.hs.DeviceRemovable[0] = 0; + hub_desc->u.hs.DeviceRemovable[1] = 0xff; + break; + + case GetHubStatus: + dev_dbg(hsotg->dev, "GetHubStatus\n"); + memset(buf, 0, 4); + break; + + case GetPortStatus: + dev_vdbg(hsotg->dev, + "GetPortStatus wIndex=0x%04x flags=0x%08x\n", windex, + hsotg->flags.d32); + if (!windex || windex > 1) + goto error; + + port_status = 0; + if (hsotg->flags.b.port_connect_status_change) + port_status |= USB_PORT_STAT_C_CONNECTION << 16; + if (hsotg->flags.b.port_enable_change) + port_status |= USB_PORT_STAT_C_ENABLE << 16; + if (hsotg->flags.b.port_suspend_change) + port_status |= USB_PORT_STAT_C_SUSPEND << 16; + if (hsotg->flags.b.port_l1_change) + port_status |= USB_PORT_STAT_C_L1 << 16; + if (hsotg->flags.b.port_reset_change) + port_status |= USB_PORT_STAT_C_RESET << 16; + if (hsotg->flags.b.port_over_current_change) { + dev_warn(hsotg->dev, "Overcurrent change detected\n"); + port_status |= USB_PORT_STAT_C_OVERCURRENT << 16; + } + + if (!hsotg->flags.b.port_connect_status) { + /* + * The port is disconnected, which means the core is + * either in device mode or it soon will be. Just + * return 0's for the remainder of the port status + * since the port register can't be read if the core + * is in device mode. + */ + *(__le32 *)buf = cpu_to_le32(port_status); + break; + } + + hprt0 = dwc2_readl(hsotg, HPRT0); + dev_vdbg(hsotg->dev, " HPRT0: 0x%08x\n", hprt0); + + if (hprt0 & HPRT0_CONNSTS) + port_status |= USB_PORT_STAT_CONNECTION; + if (hprt0 & HPRT0_ENA) + port_status |= USB_PORT_STAT_ENABLE; + if (hprt0 & HPRT0_SUSP) + port_status |= USB_PORT_STAT_SUSPEND; + if (hprt0 & HPRT0_OVRCURRACT) + port_status |= USB_PORT_STAT_OVERCURRENT; + if (hprt0 & HPRT0_RST) + port_status |= USB_PORT_STAT_RESET; + if (hprt0 & HPRT0_PWR) + port_status |= USB_PORT_STAT_POWER; + + speed = (hprt0 & HPRT0_SPD_MASK) >> HPRT0_SPD_SHIFT; + if (speed == HPRT0_SPD_HIGH_SPEED) + port_status |= USB_PORT_STAT_HIGH_SPEED; + else if (speed == HPRT0_SPD_LOW_SPEED) + port_status |= USB_PORT_STAT_LOW_SPEED; + + if (hprt0 & HPRT0_TSTCTL_MASK) + port_status |= USB_PORT_STAT_TEST; + /* USB_PORT_FEAT_INDICATOR unsupported always 0 */ + + if (hsotg->params.dma_desc_fs_enable) { + /* + * Enable descriptor DMA only if a full speed + * device is connected. + */ + if (hsotg->new_connection && + ((port_status & + (USB_PORT_STAT_CONNECTION | + USB_PORT_STAT_HIGH_SPEED | + USB_PORT_STAT_LOW_SPEED)) == + USB_PORT_STAT_CONNECTION)) { + u32 hcfg; + + dev_info(hsotg->dev, "Enabling descriptor DMA mode\n"); + hsotg->params.dma_desc_enable = true; + hcfg = dwc2_readl(hsotg, HCFG); + hcfg |= HCFG_DESCDMA; + dwc2_writel(hsotg, hcfg, HCFG); + hsotg->new_connection = false; + } + } + + dev_vdbg(hsotg->dev, "port_status=%08x\n", port_status); + *(__le32 *)buf = cpu_to_le32(port_status); + break; + + case SetHubFeature: + dev_dbg(hsotg->dev, "SetHubFeature\n"); + /* No HUB features supported */ + break; + + case SetPortFeature: + dev_dbg(hsotg->dev, "SetPortFeature\n"); + if (wvalue != USB_PORT_FEAT_TEST && (!windex || windex > 1)) + goto error; + + if (!hsotg->flags.b.port_connect_status) { + /* + * The port is disconnected, which means the core is + * either in device mode or it soon will be. Just + * return without doing anything since the port + * register can't be written if the core is in device + * mode. + */ + break; + } + + switch (wvalue) { + case USB_PORT_FEAT_SUSPEND: + dev_dbg(hsotg->dev, + "SetPortFeature - USB_PORT_FEAT_SUSPEND\n"); + if (windex != hsotg->otg_port) + goto error; + if (!hsotg->bus_suspended) + retval = dwc2_port_suspend(hsotg, windex); + break; + + case USB_PORT_FEAT_POWER: + dev_dbg(hsotg->dev, + "SetPortFeature - USB_PORT_FEAT_POWER\n"); + hprt0 = dwc2_read_hprt0(hsotg); + pwr = hprt0 & HPRT0_PWR; + hprt0 |= HPRT0_PWR; + dwc2_writel(hsotg, hprt0, HPRT0); + if (!pwr) + dwc2_vbus_supply_init(hsotg); + break; + + case USB_PORT_FEAT_RESET: + dev_dbg(hsotg->dev, + "SetPortFeature - USB_PORT_FEAT_RESET\n"); + + hprt0 = dwc2_read_hprt0(hsotg); + + if (hsotg->hibernated) { + retval = dwc2_exit_hibernation(hsotg, 0, 1, 1); + if (retval) + dev_err(hsotg->dev, + "exit hibernation failed\n"); + } + + if (hsotg->in_ppd) { + retval = dwc2_exit_partial_power_down(hsotg, 1, + true); + if (retval) + dev_err(hsotg->dev, + "exit partial_power_down failed\n"); + } + + if (hsotg->params.power_down == + DWC2_POWER_DOWN_PARAM_NONE && hsotg->bus_suspended) + dwc2_host_exit_clock_gating(hsotg, 0); + + pcgctl = dwc2_readl(hsotg, PCGCTL); + pcgctl &= ~(PCGCTL_ENBL_SLEEP_GATING | PCGCTL_STOPPCLK); + dwc2_writel(hsotg, pcgctl, PCGCTL); + /* ??? Original driver does this */ + dwc2_writel(hsotg, 0, PCGCTL); + + hprt0 = dwc2_read_hprt0(hsotg); + pwr = hprt0 & HPRT0_PWR; + /* Clear suspend bit if resetting from suspend state */ + hprt0 &= ~HPRT0_SUSP; + + /* + * When B-Host the Port reset bit is set in the Start + * HCD Callback function, so that the reset is started + * within 1ms of the HNP success interrupt + */ + if (!dwc2_hcd_is_b_host(hsotg)) { + hprt0 |= HPRT0_PWR | HPRT0_RST; + dev_dbg(hsotg->dev, + "In host mode, hprt0=%08x\n", hprt0); + dwc2_writel(hsotg, hprt0, HPRT0); + if (!pwr) + dwc2_vbus_supply_init(hsotg); + } + + /* Clear reset bit in 10ms (FS/LS) or 50ms (HS) */ + msleep(50); + hprt0 &= ~HPRT0_RST; + dwc2_writel(hsotg, hprt0, HPRT0); + hsotg->lx_state = DWC2_L0; /* Now back to On state */ + break; + + case USB_PORT_FEAT_INDICATOR: + dev_dbg(hsotg->dev, + "SetPortFeature - USB_PORT_FEAT_INDICATOR\n"); + /* Not supported */ + break; + + case USB_PORT_FEAT_TEST: + hprt0 = dwc2_read_hprt0(hsotg); + dev_dbg(hsotg->dev, + "SetPortFeature - USB_PORT_FEAT_TEST\n"); + hprt0 &= ~HPRT0_TSTCTL_MASK; + hprt0 |= (windex >> 8) << HPRT0_TSTCTL_SHIFT; + dwc2_writel(hsotg, hprt0, HPRT0); + break; + + default: + retval = -EINVAL; + dev_err(hsotg->dev, + "SetPortFeature %1xh unknown or unsupported\n", + wvalue); + break; + } + break; + + default: +error: + retval = -EINVAL; + dev_dbg(hsotg->dev, + "Unknown hub control request: %1xh wIndex: %1xh wValue: %1xh\n", + typereq, windex, wvalue); + break; + } + + return retval; +} + +static int dwc2_hcd_is_status_changed(struct dwc2_hsotg *hsotg, int port) +{ + int retval; + + if (port != 1) + return -EINVAL; + + retval = (hsotg->flags.b.port_connect_status_change || + hsotg->flags.b.port_reset_change || + hsotg->flags.b.port_enable_change || + hsotg->flags.b.port_suspend_change || + hsotg->flags.b.port_over_current_change); + + if (retval) { + dev_dbg(hsotg->dev, + "DWC OTG HCD HUB STATUS DATA: Root port status changed\n"); + dev_dbg(hsotg->dev, " port_connect_status_change: %d\n", + hsotg->flags.b.port_connect_status_change); + dev_dbg(hsotg->dev, " port_reset_change: %d\n", + hsotg->flags.b.port_reset_change); + dev_dbg(hsotg->dev, " port_enable_change: %d\n", + hsotg->flags.b.port_enable_change); + dev_dbg(hsotg->dev, " port_suspend_change: %d\n", + hsotg->flags.b.port_suspend_change); + dev_dbg(hsotg->dev, " port_over_current_change: %d\n", + hsotg->flags.b.port_over_current_change); + } + + return retval; +} + +int dwc2_hcd_get_frame_number(struct dwc2_hsotg *hsotg) +{ + u32 hfnum = dwc2_readl(hsotg, HFNUM); + +#ifdef DWC2_DEBUG_SOF + dev_vdbg(hsotg->dev, "DWC OTG HCD GET FRAME NUMBER %d\n", + (hfnum & HFNUM_FRNUM_MASK) >> HFNUM_FRNUM_SHIFT); +#endif + return (hfnum & HFNUM_FRNUM_MASK) >> HFNUM_FRNUM_SHIFT; +} + +int dwc2_hcd_get_future_frame_number(struct dwc2_hsotg *hsotg, int us) +{ + u32 hprt = dwc2_readl(hsotg, HPRT0); + u32 hfir = dwc2_readl(hsotg, HFIR); + u32 hfnum = dwc2_readl(hsotg, HFNUM); + unsigned int us_per_frame; + unsigned int frame_number; + unsigned int remaining; + unsigned int interval; + unsigned int phy_clks; + + /* High speed has 125 us per (micro) frame; others are 1 ms per */ + us_per_frame = (hprt & HPRT0_SPD_MASK) ? 1000 : 125; + + /* Extract fields */ + frame_number = (hfnum & HFNUM_FRNUM_MASK) >> HFNUM_FRNUM_SHIFT; + remaining = (hfnum & HFNUM_FRREM_MASK) >> HFNUM_FRREM_SHIFT; + interval = (hfir & HFIR_FRINT_MASK) >> HFIR_FRINT_SHIFT; + + /* + * Number of phy clocks since the last tick of the frame number after + * "us" has passed. + */ + phy_clks = (interval - remaining) + + DIV_ROUND_UP(interval * us, us_per_frame); + + return dwc2_frame_num_inc(frame_number, phy_clks / interval); +} + +int dwc2_hcd_is_b_host(struct dwc2_hsotg *hsotg) +{ + return hsotg->op_state == OTG_STATE_B_HOST; +} + +static struct dwc2_hcd_urb *dwc2_hcd_urb_alloc(struct dwc2_hsotg *hsotg, + int iso_desc_count, + gfp_t mem_flags) +{ + struct dwc2_hcd_urb *urb; + + urb = kzalloc(struct_size(urb, iso_descs, iso_desc_count), mem_flags); + if (urb) + urb->packet_count = iso_desc_count; + return urb; +} + +static void dwc2_hcd_urb_set_pipeinfo(struct dwc2_hsotg *hsotg, + struct dwc2_hcd_urb *urb, u8 dev_addr, + u8 ep_num, u8 ep_type, u8 ep_dir, + u16 maxp, u16 maxp_mult) +{ + if (dbg_perio() || + ep_type == USB_ENDPOINT_XFER_BULK || + ep_type == USB_ENDPOINT_XFER_CONTROL) + dev_vdbg(hsotg->dev, + "addr=%d, ep_num=%d, ep_dir=%1x, ep_type=%1x, maxp=%d (%d mult)\n", + dev_addr, ep_num, ep_dir, ep_type, maxp, maxp_mult); + urb->pipe_info.dev_addr = dev_addr; + urb->pipe_info.ep_num = ep_num; + urb->pipe_info.pipe_type = ep_type; + urb->pipe_info.pipe_dir = ep_dir; + urb->pipe_info.maxp = maxp; + urb->pipe_info.maxp_mult = maxp_mult; +} + +/* + * NOTE: This function will be removed once the peripheral controller code + * is integrated and the driver is stable + */ +void dwc2_hcd_dump_state(struct dwc2_hsotg *hsotg) +{ +#ifdef DEBUG + struct dwc2_host_chan *chan; + struct dwc2_hcd_urb *urb; + struct dwc2_qtd *qtd; + int num_channels; + u32 np_tx_status; + u32 p_tx_status; + int i; + + num_channels = hsotg->params.host_channels; + dev_dbg(hsotg->dev, "\n"); + dev_dbg(hsotg->dev, + "************************************************************\n"); + dev_dbg(hsotg->dev, "HCD State:\n"); + dev_dbg(hsotg->dev, " Num channels: %d\n", num_channels); + + for (i = 0; i < num_channels; i++) { + chan = hsotg->hc_ptr_array[i]; + dev_dbg(hsotg->dev, " Channel %d:\n", i); + dev_dbg(hsotg->dev, + " dev_addr: %d, ep_num: %d, ep_is_in: %d\n", + chan->dev_addr, chan->ep_num, chan->ep_is_in); + dev_dbg(hsotg->dev, " speed: %d\n", chan->speed); + dev_dbg(hsotg->dev, " ep_type: %d\n", chan->ep_type); + dev_dbg(hsotg->dev, " max_packet: %d\n", chan->max_packet); + dev_dbg(hsotg->dev, " data_pid_start: %d\n", + chan->data_pid_start); + dev_dbg(hsotg->dev, " multi_count: %d\n", chan->multi_count); + dev_dbg(hsotg->dev, " xfer_started: %d\n", + chan->xfer_started); + dev_dbg(hsotg->dev, " xfer_buf: %p\n", chan->xfer_buf); + dev_dbg(hsotg->dev, " xfer_dma: %08lx\n", + (unsigned long)chan->xfer_dma); + dev_dbg(hsotg->dev, " xfer_len: %d\n", chan->xfer_len); + dev_dbg(hsotg->dev, " xfer_count: %d\n", chan->xfer_count); + dev_dbg(hsotg->dev, " halt_on_queue: %d\n", + chan->halt_on_queue); + dev_dbg(hsotg->dev, " halt_pending: %d\n", + chan->halt_pending); + dev_dbg(hsotg->dev, " halt_status: %d\n", chan->halt_status); + dev_dbg(hsotg->dev, " do_split: %d\n", chan->do_split); + dev_dbg(hsotg->dev, " complete_split: %d\n", + chan->complete_split); + dev_dbg(hsotg->dev, " hub_addr: %d\n", chan->hub_addr); + dev_dbg(hsotg->dev, " hub_port: %d\n", chan->hub_port); + dev_dbg(hsotg->dev, " xact_pos: %d\n", chan->xact_pos); + dev_dbg(hsotg->dev, " requests: %d\n", chan->requests); + dev_dbg(hsotg->dev, " qh: %p\n", chan->qh); + + if (chan->xfer_started) { + u32 hfnum, hcchar, hctsiz, hcint, hcintmsk; + + hfnum = dwc2_readl(hsotg, HFNUM); + hcchar = dwc2_readl(hsotg, HCCHAR(i)); + hctsiz = dwc2_readl(hsotg, HCTSIZ(i)); + hcint = dwc2_readl(hsotg, HCINT(i)); + hcintmsk = dwc2_readl(hsotg, HCINTMSK(i)); + dev_dbg(hsotg->dev, " hfnum: 0x%08x\n", hfnum); + dev_dbg(hsotg->dev, " hcchar: 0x%08x\n", hcchar); + dev_dbg(hsotg->dev, " hctsiz: 0x%08x\n", hctsiz); + dev_dbg(hsotg->dev, " hcint: 0x%08x\n", hcint); + dev_dbg(hsotg->dev, " hcintmsk: 0x%08x\n", hcintmsk); + } + + if (!(chan->xfer_started && chan->qh)) + continue; + + list_for_each_entry(qtd, &chan->qh->qtd_list, qtd_list_entry) { + if (!qtd->in_process) + break; + urb = qtd->urb; + dev_dbg(hsotg->dev, " URB Info:\n"); + dev_dbg(hsotg->dev, " qtd: %p, urb: %p\n", + qtd, urb); + if (urb) { + dev_dbg(hsotg->dev, + " Dev: %d, EP: %d %s\n", + dwc2_hcd_get_dev_addr(&urb->pipe_info), + dwc2_hcd_get_ep_num(&urb->pipe_info), + dwc2_hcd_is_pipe_in(&urb->pipe_info) ? + "IN" : "OUT"); + dev_dbg(hsotg->dev, + " Max packet size: %d (%d mult)\n", + dwc2_hcd_get_maxp(&urb->pipe_info), + dwc2_hcd_get_maxp_mult(&urb->pipe_info)); + dev_dbg(hsotg->dev, + " transfer_buffer: %p\n", + urb->buf); + dev_dbg(hsotg->dev, + " transfer_dma: %08lx\n", + (unsigned long)urb->dma); + dev_dbg(hsotg->dev, + " transfer_buffer_length: %d\n", + urb->length); + dev_dbg(hsotg->dev, " actual_length: %d\n", + urb->actual_length); + } + } + } + + dev_dbg(hsotg->dev, " non_periodic_channels: %d\n", + hsotg->non_periodic_channels); + dev_dbg(hsotg->dev, " periodic_channels: %d\n", + hsotg->periodic_channels); + dev_dbg(hsotg->dev, " periodic_usecs: %d\n", hsotg->periodic_usecs); + np_tx_status = dwc2_readl(hsotg, GNPTXSTS); + dev_dbg(hsotg->dev, " NP Tx Req Queue Space Avail: %d\n", + (np_tx_status & TXSTS_QSPCAVAIL_MASK) >> TXSTS_QSPCAVAIL_SHIFT); + dev_dbg(hsotg->dev, " NP Tx FIFO Space Avail: %d\n", + (np_tx_status & TXSTS_FSPCAVAIL_MASK) >> TXSTS_FSPCAVAIL_SHIFT); + p_tx_status = dwc2_readl(hsotg, HPTXSTS); + dev_dbg(hsotg->dev, " P Tx Req Queue Space Avail: %d\n", + (p_tx_status & TXSTS_QSPCAVAIL_MASK) >> TXSTS_QSPCAVAIL_SHIFT); + dev_dbg(hsotg->dev, " P Tx FIFO Space Avail: %d\n", + (p_tx_status & TXSTS_FSPCAVAIL_MASK) >> TXSTS_FSPCAVAIL_SHIFT); + dwc2_dump_global_registers(hsotg); + dwc2_dump_host_registers(hsotg); + dev_dbg(hsotg->dev, + "************************************************************\n"); + dev_dbg(hsotg->dev, "\n"); +#endif +} + +struct wrapper_priv_data { + struct dwc2_hsotg *hsotg; +}; + +/* Gets the dwc2_hsotg from a usb_hcd */ +static struct dwc2_hsotg *dwc2_hcd_to_hsotg(struct usb_hcd *hcd) +{ + struct wrapper_priv_data *p; + + p = (struct wrapper_priv_data *)&hcd->hcd_priv; + return p->hsotg; +} + +/** + * dwc2_host_get_tt_info() - Get the dwc2_tt associated with context + * + * This will get the dwc2_tt structure (and ttport) associated with the given + * context (which is really just a struct urb pointer). + * + * The first time this is called for a given TT we allocate memory for our + * structure. When everyone is done and has called dwc2_host_put_tt_info() + * then the refcount for the structure will go to 0 and we'll free it. + * + * @hsotg: The HCD state structure for the DWC OTG controller. + * @context: The priv pointer from a struct dwc2_hcd_urb. + * @mem_flags: Flags for allocating memory. + * @ttport: We'll return this device's port number here. That's used to + * reference into the bitmap if we're on a multi_tt hub. + * + * Return: a pointer to a struct dwc2_tt. Don't forget to call + * dwc2_host_put_tt_info()! Returns NULL upon memory alloc failure. + */ + +struct dwc2_tt *dwc2_host_get_tt_info(struct dwc2_hsotg *hsotg, void *context, + gfp_t mem_flags, int *ttport) +{ + struct urb *urb = context; + struct dwc2_tt *dwc_tt = NULL; + + if (urb->dev->tt) { + *ttport = urb->dev->ttport; + + dwc_tt = urb->dev->tt->hcpriv; + if (!dwc_tt) { + size_t bitmap_size; + + /* + * For single_tt we need one schedule. For multi_tt + * we need one per port. + */ + bitmap_size = DWC2_ELEMENTS_PER_LS_BITMAP * + sizeof(dwc_tt->periodic_bitmaps[0]); + if (urb->dev->tt->multi) + bitmap_size *= urb->dev->tt->hub->maxchild; + + dwc_tt = kzalloc(sizeof(*dwc_tt) + bitmap_size, + mem_flags); + if (!dwc_tt) + return NULL; + + dwc_tt->usb_tt = urb->dev->tt; + dwc_tt->usb_tt->hcpriv = dwc_tt; + } + + dwc_tt->refcount++; + } + + return dwc_tt; +} + +/** + * dwc2_host_put_tt_info() - Put the dwc2_tt from dwc2_host_get_tt_info() + * + * Frees resources allocated by dwc2_host_get_tt_info() if all current holders + * of the structure are done. + * + * It's OK to call this with NULL. + * + * @hsotg: The HCD state structure for the DWC OTG controller. + * @dwc_tt: The pointer returned by dwc2_host_get_tt_info. + */ +void dwc2_host_put_tt_info(struct dwc2_hsotg *hsotg, struct dwc2_tt *dwc_tt) +{ + /* Model kfree and make put of NULL a no-op */ + if (!dwc_tt) + return; + + WARN_ON(dwc_tt->refcount < 1); + + dwc_tt->refcount--; + if (!dwc_tt->refcount) { + dwc_tt->usb_tt->hcpriv = NULL; + kfree(dwc_tt); + } +} + +int dwc2_host_get_speed(struct dwc2_hsotg *hsotg, void *context) +{ + struct urb *urb = context; + + return urb->dev->speed; +} + +static void dwc2_allocate_bus_bandwidth(struct usb_hcd *hcd, u16 bw, + struct urb *urb) +{ + struct usb_bus *bus = hcd_to_bus(hcd); + + if (urb->interval) + bus->bandwidth_allocated += bw / urb->interval; + if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) + bus->bandwidth_isoc_reqs++; + else + bus->bandwidth_int_reqs++; +} + +static void dwc2_free_bus_bandwidth(struct usb_hcd *hcd, u16 bw, + struct urb *urb) +{ + struct usb_bus *bus = hcd_to_bus(hcd); + + if (urb->interval) + bus->bandwidth_allocated -= bw / urb->interval; + if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) + bus->bandwidth_isoc_reqs--; + else + bus->bandwidth_int_reqs--; +} + +/* + * Sets the final status of an URB and returns it to the upper layer. Any + * required cleanup of the URB is performed. + * + * Must be called with interrupt disabled and spinlock held + */ +void dwc2_host_complete(struct dwc2_hsotg *hsotg, struct dwc2_qtd *qtd, + int status) +{ + struct urb *urb; + int i; + + if (!qtd) { + dev_dbg(hsotg->dev, "## %s: qtd is NULL ##\n", __func__); + return; + } + + if (!qtd->urb) { + dev_dbg(hsotg->dev, "## %s: qtd->urb is NULL ##\n", __func__); + return; + } + + urb = qtd->urb->priv; + if (!urb) { + dev_dbg(hsotg->dev, "## %s: urb->priv is NULL ##\n", __func__); + return; + } + + urb->actual_length = dwc2_hcd_urb_get_actual_length(qtd->urb); + + if (dbg_urb(urb)) + dev_vdbg(hsotg->dev, + "%s: urb %p device %d ep %d-%s status %d actual %d\n", + __func__, urb, usb_pipedevice(urb->pipe), + usb_pipeendpoint(urb->pipe), + usb_pipein(urb->pipe) ? "IN" : "OUT", status, + urb->actual_length); + + if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) { + urb->error_count = dwc2_hcd_urb_get_error_count(qtd->urb); + for (i = 0; i < urb->number_of_packets; ++i) { + urb->iso_frame_desc[i].actual_length = + dwc2_hcd_urb_get_iso_desc_actual_length( + qtd->urb, i); + urb->iso_frame_desc[i].status = + dwc2_hcd_urb_get_iso_desc_status(qtd->urb, i); + } + } + + if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS && dbg_perio()) { + for (i = 0; i < urb->number_of_packets; i++) + dev_vdbg(hsotg->dev, " ISO Desc %d status %d\n", + i, urb->iso_frame_desc[i].status); + } + + urb->status = status; + if (!status) { + if ((urb->transfer_flags & URB_SHORT_NOT_OK) && + urb->actual_length < urb->transfer_buffer_length) + urb->status = -EREMOTEIO; + } + + if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS || + usb_pipetype(urb->pipe) == PIPE_INTERRUPT) { + struct usb_host_endpoint *ep = urb->ep; + + if (ep) + dwc2_free_bus_bandwidth(dwc2_hsotg_to_hcd(hsotg), + dwc2_hcd_get_ep_bandwidth(hsotg, ep), + urb); + } + + usb_hcd_unlink_urb_from_ep(dwc2_hsotg_to_hcd(hsotg), urb); + urb->hcpriv = NULL; + kfree(qtd->urb); + qtd->urb = NULL; + + usb_hcd_giveback_urb(dwc2_hsotg_to_hcd(hsotg), urb, status); +} + +/* + * Work queue function for starting the HCD when A-Cable is connected + */ +static void dwc2_hcd_start_func(struct work_struct *work) +{ + struct dwc2_hsotg *hsotg = container_of(work, struct dwc2_hsotg, + start_work.work); + + dev_dbg(hsotg->dev, "%s() %p\n", __func__, hsotg); + dwc2_host_start(hsotg); +} + +/* + * Reset work queue function + */ +static void dwc2_hcd_reset_func(struct work_struct *work) +{ + struct dwc2_hsotg *hsotg = container_of(work, struct dwc2_hsotg, + reset_work.work); + unsigned long flags; + u32 hprt0; + + dev_dbg(hsotg->dev, "USB RESET function called\n"); + + spin_lock_irqsave(&hsotg->lock, flags); + + hprt0 = dwc2_read_hprt0(hsotg); + hprt0 &= ~HPRT0_RST; + dwc2_writel(hsotg, hprt0, HPRT0); + hsotg->flags.b.port_reset_change = 1; + + spin_unlock_irqrestore(&hsotg->lock, flags); +} + +static void dwc2_hcd_phy_reset_func(struct work_struct *work) +{ + struct dwc2_hsotg *hsotg = container_of(work, struct dwc2_hsotg, + phy_reset_work); + int ret; + + ret = phy_reset(hsotg->phy); + if (ret) + dev_warn(hsotg->dev, "PHY reset failed\n"); +} + +/* + * ========================================================================= + * Linux HC Driver Functions + * ========================================================================= + */ + +/* + * Initializes the DWC_otg controller and its root hub and prepares it for host + * mode operation. Activates the root port. Returns 0 on success and a negative + * error code on failure. + */ +static int _dwc2_hcd_start(struct usb_hcd *hcd) +{ + struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd); + struct usb_bus *bus = hcd_to_bus(hcd); + unsigned long flags; + u32 hprt0; + int ret; + + dev_dbg(hsotg->dev, "DWC OTG HCD START\n"); + + spin_lock_irqsave(&hsotg->lock, flags); + hsotg->lx_state = DWC2_L0; + hcd->state = HC_STATE_RUNNING; + set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); + + if (dwc2_is_device_mode(hsotg)) { + spin_unlock_irqrestore(&hsotg->lock, flags); + return 0; /* why 0 ?? */ + } + + dwc2_hcd_reinit(hsotg); + + hprt0 = dwc2_read_hprt0(hsotg); + /* Has vbus power been turned on in dwc2_core_host_init ? */ + if (hprt0 & HPRT0_PWR) { + /* Enable external vbus supply before resuming root hub */ + spin_unlock_irqrestore(&hsotg->lock, flags); + ret = dwc2_vbus_supply_init(hsotg); + if (ret) + return ret; + spin_lock_irqsave(&hsotg->lock, flags); + } + + /* Initialize and connect root hub if one is not already attached */ + if (bus->root_hub) { + dev_dbg(hsotg->dev, "DWC OTG HCD Has Root Hub\n"); + /* Inform the HUB driver to resume */ + usb_hcd_resume_root_hub(hcd); + } + + spin_unlock_irqrestore(&hsotg->lock, flags); + + return 0; +} + +/* + * Halts the DWC_otg host mode operations in a clean manner. USB transfers are + * stopped. + */ +static void _dwc2_hcd_stop(struct usb_hcd *hcd) +{ + struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd); + unsigned long flags; + u32 hprt0; + + /* Turn off all host-specific interrupts */ + dwc2_disable_host_interrupts(hsotg); + + /* Wait for interrupt processing to finish */ + synchronize_irq(hcd->irq); + + spin_lock_irqsave(&hsotg->lock, flags); + hprt0 = dwc2_read_hprt0(hsotg); + /* Ensure hcd is disconnected */ + dwc2_hcd_disconnect(hsotg, true); + dwc2_hcd_stop(hsotg); + hsotg->lx_state = DWC2_L3; + hcd->state = HC_STATE_HALT; + clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); + spin_unlock_irqrestore(&hsotg->lock, flags); + + /* keep balanced supply init/exit by checking HPRT0_PWR */ + if (hprt0 & HPRT0_PWR) + dwc2_vbus_supply_exit(hsotg); + + usleep_range(1000, 3000); +} + +static int _dwc2_hcd_suspend(struct usb_hcd *hcd) +{ + struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd); + unsigned long flags; + int ret = 0; + + spin_lock_irqsave(&hsotg->lock, flags); + + if (dwc2_is_device_mode(hsotg)) + goto unlock; + + if (hsotg->lx_state != DWC2_L0) + goto unlock; + + if (!HCD_HW_ACCESSIBLE(hcd)) + goto unlock; + + if (hsotg->op_state == OTG_STATE_B_PERIPHERAL) + goto unlock; + + if (hsotg->bus_suspended) + goto skip_power_saving; + + if (hsotg->flags.b.port_connect_status == 0) + goto skip_power_saving; + + switch (hsotg->params.power_down) { + case DWC2_POWER_DOWN_PARAM_PARTIAL: + /* Enter partial_power_down */ + ret = dwc2_enter_partial_power_down(hsotg); + if (ret) + dev_err(hsotg->dev, + "enter partial_power_down failed\n"); + /* After entering suspend, hardware is not accessible */ + clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); + break; + case DWC2_POWER_DOWN_PARAM_HIBERNATION: + /* Enter hibernation */ + spin_unlock_irqrestore(&hsotg->lock, flags); + ret = dwc2_enter_hibernation(hsotg, 1); + if (ret) + dev_err(hsotg->dev, "enter hibernation failed\n"); + spin_lock_irqsave(&hsotg->lock, flags); + + /* After entering suspend, hardware is not accessible */ + clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); + break; + case DWC2_POWER_DOWN_PARAM_NONE: + /* + * If not hibernation nor partial power down are supported, + * clock gating is used to save power. + */ + if (!hsotg->params.no_clock_gating) { + dwc2_host_enter_clock_gating(hsotg); + + /* After entering suspend, hardware is not accessible */ + clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); + } + break; + default: + goto skip_power_saving; + } + + spin_unlock_irqrestore(&hsotg->lock, flags); + dwc2_vbus_supply_exit(hsotg); + spin_lock_irqsave(&hsotg->lock, flags); + + /* Ask phy to be suspended */ + if (!IS_ERR_OR_NULL(hsotg->uphy)) { + spin_unlock_irqrestore(&hsotg->lock, flags); + usb_phy_set_suspend(hsotg->uphy, true); + spin_lock_irqsave(&hsotg->lock, flags); + } + +skip_power_saving: + hsotg->lx_state = DWC2_L2; +unlock: + spin_unlock_irqrestore(&hsotg->lock, flags); + + return ret; +} + +static int _dwc2_hcd_resume(struct usb_hcd *hcd) +{ + struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd); + unsigned long flags; + u32 hprt0; + int ret = 0; + + spin_lock_irqsave(&hsotg->lock, flags); + + if (dwc2_is_device_mode(hsotg)) + goto unlock; + + if (hsotg->lx_state != DWC2_L2) + goto unlock; + + hprt0 = dwc2_read_hprt0(hsotg); + + /* + * Added port connection status checking which prevents exiting from + * Partial Power Down mode from _dwc2_hcd_resume() if not in Partial + * Power Down mode. + */ + if (hprt0 & HPRT0_CONNSTS) { + hsotg->lx_state = DWC2_L0; + goto unlock; + } + + switch (hsotg->params.power_down) { + case DWC2_POWER_DOWN_PARAM_PARTIAL: + ret = dwc2_exit_partial_power_down(hsotg, 0, true); + if (ret) + dev_err(hsotg->dev, + "exit partial_power_down failed\n"); + /* + * Set HW accessible bit before powering on the controller + * since an interrupt may rise. + */ + set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); + break; + case DWC2_POWER_DOWN_PARAM_HIBERNATION: + ret = dwc2_exit_hibernation(hsotg, 0, 0, 1); + if (ret) + dev_err(hsotg->dev, "exit hibernation failed.\n"); + + /* + * Set HW accessible bit before powering on the controller + * since an interrupt may rise. + */ + set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); + break; + case DWC2_POWER_DOWN_PARAM_NONE: + /* + * If not hibernation nor partial power down are supported, + * port resume is done using the clock gating programming flow. + */ + spin_unlock_irqrestore(&hsotg->lock, flags); + dwc2_host_exit_clock_gating(hsotg, 0); + + /* + * Initialize the Core for Host mode, as after system resume + * the global interrupts are disabled. + */ + dwc2_core_init(hsotg, false); + dwc2_enable_global_interrupts(hsotg); + dwc2_hcd_reinit(hsotg); + spin_lock_irqsave(&hsotg->lock, flags); + + /* + * Set HW accessible bit before powering on the controller + * since an interrupt may rise. + */ + set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); + break; + default: + hsotg->lx_state = DWC2_L0; + goto unlock; + } + + /* Change Root port status, as port status change occurred after resume.*/ + hsotg->flags.b.port_suspend_change = 1; + + /* + * Enable power if not already done. + * This must not be spinlocked since duration + * of this call is unknown. + */ + if (!IS_ERR_OR_NULL(hsotg->uphy)) { + spin_unlock_irqrestore(&hsotg->lock, flags); + usb_phy_set_suspend(hsotg->uphy, false); + spin_lock_irqsave(&hsotg->lock, flags); + } + + /* Enable external vbus supply after resuming the port. */ + spin_unlock_irqrestore(&hsotg->lock, flags); + dwc2_vbus_supply_init(hsotg); + + /* Wait for controller to correctly update D+/D- level */ + usleep_range(3000, 5000); + spin_lock_irqsave(&hsotg->lock, flags); + + /* + * Clear Port Enable and Port Status changes. + * Enable Port Power. + */ + dwc2_writel(hsotg, HPRT0_PWR | HPRT0_CONNDET | + HPRT0_ENACHG, HPRT0); + + /* Wait for controller to detect Port Connect */ + spin_unlock_irqrestore(&hsotg->lock, flags); + usleep_range(5000, 7000); + spin_lock_irqsave(&hsotg->lock, flags); +unlock: + spin_unlock_irqrestore(&hsotg->lock, flags); + + return ret; +} + +/* Returns the current frame number */ +static int _dwc2_hcd_get_frame_number(struct usb_hcd *hcd) +{ + struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd); + + return dwc2_hcd_get_frame_number(hsotg); +} + +static void dwc2_dump_urb_info(struct usb_hcd *hcd, struct urb *urb, + char *fn_name) +{ +#ifdef VERBOSE_DEBUG + struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd); + char *pipetype = NULL; + char *speed = NULL; + + dev_vdbg(hsotg->dev, "%s, urb %p\n", fn_name, urb); + dev_vdbg(hsotg->dev, " Device address: %d\n", + usb_pipedevice(urb->pipe)); + dev_vdbg(hsotg->dev, " Endpoint: %d, %s\n", + usb_pipeendpoint(urb->pipe), + usb_pipein(urb->pipe) ? "IN" : "OUT"); + + switch (usb_pipetype(urb->pipe)) { + case PIPE_CONTROL: + pipetype = "CONTROL"; + break; + case PIPE_BULK: + pipetype = "BULK"; + break; + case PIPE_INTERRUPT: + pipetype = "INTERRUPT"; + break; + case PIPE_ISOCHRONOUS: + pipetype = "ISOCHRONOUS"; + break; + } + + dev_vdbg(hsotg->dev, " Endpoint type: %s %s (%s)\n", pipetype, + usb_urb_dir_in(urb) ? "IN" : "OUT", usb_pipein(urb->pipe) ? + "IN" : "OUT"); + + switch (urb->dev->speed) { + case USB_SPEED_HIGH: + speed = "HIGH"; + break; + case USB_SPEED_FULL: + speed = "FULL"; + break; + case USB_SPEED_LOW: + speed = "LOW"; + break; + default: + speed = "UNKNOWN"; + break; + } + + dev_vdbg(hsotg->dev, " Speed: %s\n", speed); + dev_vdbg(hsotg->dev, " Max packet size: %d (%d mult)\n", + usb_endpoint_maxp(&urb->ep->desc), + usb_endpoint_maxp_mult(&urb->ep->desc)); + + dev_vdbg(hsotg->dev, " Data buffer length: %d\n", + urb->transfer_buffer_length); + dev_vdbg(hsotg->dev, " Transfer buffer: %p, Transfer DMA: %08lx\n", + urb->transfer_buffer, (unsigned long)urb->transfer_dma); + dev_vdbg(hsotg->dev, " Setup buffer: %p, Setup DMA: %08lx\n", + urb->setup_packet, (unsigned long)urb->setup_dma); + dev_vdbg(hsotg->dev, " Interval: %d\n", urb->interval); + + if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) { + int i; + + for (i = 0; i < urb->number_of_packets; i++) { + dev_vdbg(hsotg->dev, " ISO Desc %d:\n", i); + dev_vdbg(hsotg->dev, " offset: %d, length %d\n", + urb->iso_frame_desc[i].offset, + urb->iso_frame_desc[i].length); + } + } +#endif +} + +/* + * Starts processing a USB transfer request specified by a USB Request Block + * (URB). mem_flags indicates the type of memory allocation to use while + * processing this URB. + */ +static int _dwc2_hcd_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, + gfp_t mem_flags) +{ + struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd); + struct usb_host_endpoint *ep = urb->ep; + struct dwc2_hcd_urb *dwc2_urb; + int i; + int retval; + int alloc_bandwidth = 0; + u8 ep_type = 0; + u32 tflags = 0; + void *buf; + unsigned long flags; + struct dwc2_qh *qh; + bool qh_allocated = false; + struct dwc2_qtd *qtd; + struct dwc2_gregs_backup *gr; + + gr = &hsotg->gr_backup; + + if (dbg_urb(urb)) { + dev_vdbg(hsotg->dev, "DWC OTG HCD URB Enqueue\n"); + dwc2_dump_urb_info(hcd, urb, "urb_enqueue"); + } + + if (hsotg->hibernated) { + if (gr->gotgctl & GOTGCTL_CURMODE_HOST) + retval = dwc2_exit_hibernation(hsotg, 0, 0, 1); + else + retval = dwc2_exit_hibernation(hsotg, 0, 0, 0); + + if (retval) + dev_err(hsotg->dev, + "exit hibernation failed.\n"); + } + + if (hsotg->in_ppd) { + retval = dwc2_exit_partial_power_down(hsotg, 0, true); + if (retval) + dev_err(hsotg->dev, + "exit partial_power_down failed\n"); + } + + if (hsotg->params.power_down == DWC2_POWER_DOWN_PARAM_NONE && + hsotg->bus_suspended) { + if (dwc2_is_device_mode(hsotg)) + dwc2_gadget_exit_clock_gating(hsotg, 0); + else + dwc2_host_exit_clock_gating(hsotg, 0); + } + + if (!ep) + return -EINVAL; + + if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS || + usb_pipetype(urb->pipe) == PIPE_INTERRUPT) { + spin_lock_irqsave(&hsotg->lock, flags); + if (!dwc2_hcd_is_bandwidth_allocated(hsotg, ep)) + alloc_bandwidth = 1; + spin_unlock_irqrestore(&hsotg->lock, flags); + } + + switch (usb_pipetype(urb->pipe)) { + case PIPE_CONTROL: + ep_type = USB_ENDPOINT_XFER_CONTROL; + break; + case PIPE_ISOCHRONOUS: + ep_type = USB_ENDPOINT_XFER_ISOC; + break; + case PIPE_BULK: + ep_type = USB_ENDPOINT_XFER_BULK; + break; + case PIPE_INTERRUPT: + ep_type = USB_ENDPOINT_XFER_INT; + break; + } + + dwc2_urb = dwc2_hcd_urb_alloc(hsotg, urb->number_of_packets, + mem_flags); + if (!dwc2_urb) + return -ENOMEM; + + dwc2_hcd_urb_set_pipeinfo(hsotg, dwc2_urb, usb_pipedevice(urb->pipe), + usb_pipeendpoint(urb->pipe), ep_type, + usb_pipein(urb->pipe), + usb_endpoint_maxp(&ep->desc), + usb_endpoint_maxp_mult(&ep->desc)); + + buf = urb->transfer_buffer; + + if (hcd_uses_dma(hcd)) { + if (!buf && (urb->transfer_dma & 3)) { + dev_err(hsotg->dev, + "%s: unaligned transfer with no transfer_buffer", + __func__); + retval = -EINVAL; + goto fail0; + } + } + + if (!(urb->transfer_flags & URB_NO_INTERRUPT)) + tflags |= URB_GIVEBACK_ASAP; + if (urb->transfer_flags & URB_ZERO_PACKET) + tflags |= URB_SEND_ZERO_PACKET; + + dwc2_urb->priv = urb; + dwc2_urb->buf = buf; + dwc2_urb->dma = urb->transfer_dma; + dwc2_urb->length = urb->transfer_buffer_length; + dwc2_urb->setup_packet = urb->setup_packet; + dwc2_urb->setup_dma = urb->setup_dma; + dwc2_urb->flags = tflags; + dwc2_urb->interval = urb->interval; + dwc2_urb->status = -EINPROGRESS; + + for (i = 0; i < urb->number_of_packets; ++i) + dwc2_hcd_urb_set_iso_desc_params(dwc2_urb, i, + urb->iso_frame_desc[i].offset, + urb->iso_frame_desc[i].length); + + urb->hcpriv = dwc2_urb; + qh = (struct dwc2_qh *)ep->hcpriv; + /* Create QH for the endpoint if it doesn't exist */ + if (!qh) { + qh = dwc2_hcd_qh_create(hsotg, dwc2_urb, mem_flags); + if (!qh) { + retval = -ENOMEM; + goto fail0; + } + ep->hcpriv = qh; + qh_allocated = true; + } + + qtd = kzalloc(sizeof(*qtd), mem_flags); + if (!qtd) { + retval = -ENOMEM; + goto fail1; + } + + spin_lock_irqsave(&hsotg->lock, flags); + retval = usb_hcd_link_urb_to_ep(hcd, urb); + if (retval) + goto fail2; + + retval = dwc2_hcd_urb_enqueue(hsotg, dwc2_urb, qh, qtd); + if (retval) + goto fail3; + + if (alloc_bandwidth) { + dwc2_allocate_bus_bandwidth(hcd, + dwc2_hcd_get_ep_bandwidth(hsotg, ep), + urb); + } + + spin_unlock_irqrestore(&hsotg->lock, flags); + + return 0; + +fail3: + dwc2_urb->priv = NULL; + usb_hcd_unlink_urb_from_ep(hcd, urb); + if (qh_allocated && qh->channel && qh->channel->qh == qh) + qh->channel->qh = NULL; +fail2: + urb->hcpriv = NULL; + spin_unlock_irqrestore(&hsotg->lock, flags); + kfree(qtd); +fail1: + if (qh_allocated) { + struct dwc2_qtd *qtd2, *qtd2_tmp; + + ep->hcpriv = NULL; + dwc2_hcd_qh_unlink(hsotg, qh); + /* Free each QTD in the QH's QTD list */ + list_for_each_entry_safe(qtd2, qtd2_tmp, &qh->qtd_list, + qtd_list_entry) + dwc2_hcd_qtd_unlink_and_free(hsotg, qtd2, qh); + dwc2_hcd_qh_free(hsotg, qh); + } +fail0: + kfree(dwc2_urb); + + return retval; +} + +/* + * Aborts/cancels a USB transfer request. Always returns 0 to indicate success. + */ +static int _dwc2_hcd_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, + int status) +{ + struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd); + int rc; + unsigned long flags; + + dev_dbg(hsotg->dev, "DWC OTG HCD URB Dequeue\n"); + dwc2_dump_urb_info(hcd, urb, "urb_dequeue"); + + spin_lock_irqsave(&hsotg->lock, flags); + + rc = usb_hcd_check_unlink_urb(hcd, urb, status); + if (rc) + goto out; + + if (!urb->hcpriv) { + dev_dbg(hsotg->dev, "## urb->hcpriv is NULL ##\n"); + goto out; + } + + rc = dwc2_hcd_urb_dequeue(hsotg, urb->hcpriv); + + usb_hcd_unlink_urb_from_ep(hcd, urb); + + kfree(urb->hcpriv); + urb->hcpriv = NULL; + + /* Higher layer software sets URB status */ + spin_unlock(&hsotg->lock); + usb_hcd_giveback_urb(hcd, urb, status); + spin_lock(&hsotg->lock); + + dev_dbg(hsotg->dev, "Called usb_hcd_giveback_urb()\n"); + dev_dbg(hsotg->dev, " urb->status = %d\n", urb->status); +out: + spin_unlock_irqrestore(&hsotg->lock, flags); + + return rc; +} + +/* + * Frees resources in the DWC_otg controller related to a given endpoint. Also + * clears state in the HCD related to the endpoint. Any URBs for the endpoint + * must already be dequeued. + */ +static void _dwc2_hcd_endpoint_disable(struct usb_hcd *hcd, + struct usb_host_endpoint *ep) +{ + struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd); + + dev_dbg(hsotg->dev, + "DWC OTG HCD EP DISABLE: bEndpointAddress=0x%02x, ep->hcpriv=%p\n", + ep->desc.bEndpointAddress, ep->hcpriv); + dwc2_hcd_endpoint_disable(hsotg, ep, 250); +} + +/* + * Resets endpoint specific parameter values, in current version used to reset + * the data toggle (as a WA). This function can be called from usb_clear_halt + * routine. + */ +static void _dwc2_hcd_endpoint_reset(struct usb_hcd *hcd, + struct usb_host_endpoint *ep) +{ + struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd); + unsigned long flags; + + dev_dbg(hsotg->dev, + "DWC OTG HCD EP RESET: bEndpointAddress=0x%02x\n", + ep->desc.bEndpointAddress); + + spin_lock_irqsave(&hsotg->lock, flags); + dwc2_hcd_endpoint_reset(hsotg, ep); + spin_unlock_irqrestore(&hsotg->lock, flags); +} + +/* + * Handles host mode interrupts for the DWC_otg controller. Returns IRQ_NONE if + * there was no interrupt to handle. Returns IRQ_HANDLED if there was a valid + * interrupt. + * + * This function is called by the USB core when an interrupt occurs + */ +static irqreturn_t _dwc2_hcd_irq(struct usb_hcd *hcd) +{ + struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd); + + return dwc2_handle_hcd_intr(hsotg); +} + +/* + * Creates Status Change bitmap for the root hub and root port. The bitmap is + * returned in buf. Bit 0 is the status change indicator for the root hub. Bit 1 + * is the status change indicator for the single root port. Returns 1 if either + * change indicator is 1, otherwise returns 0. + */ +static int _dwc2_hcd_hub_status_data(struct usb_hcd *hcd, char *buf) +{ + struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd); + + buf[0] = dwc2_hcd_is_status_changed(hsotg, 1) << 1; + return buf[0] != 0; +} + +/* Handles hub class-specific requests */ +static int _dwc2_hcd_hub_control(struct usb_hcd *hcd, u16 typereq, u16 wvalue, + u16 windex, char *buf, u16 wlength) +{ + int retval = dwc2_hcd_hub_control(dwc2_hcd_to_hsotg(hcd), typereq, + wvalue, windex, buf, wlength); + return retval; +} + +/* Handles hub TT buffer clear completions */ +static void _dwc2_hcd_clear_tt_buffer_complete(struct usb_hcd *hcd, + struct usb_host_endpoint *ep) +{ + struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd); + struct dwc2_qh *qh; + unsigned long flags; + + qh = ep->hcpriv; + if (!qh) + return; + + spin_lock_irqsave(&hsotg->lock, flags); + qh->tt_buffer_dirty = 0; + + if (hsotg->flags.b.port_connect_status) + dwc2_hcd_queue_transactions(hsotg, DWC2_TRANSACTION_ALL); + + spin_unlock_irqrestore(&hsotg->lock, flags); +} + +/* + * HPRT0_SPD_HIGH_SPEED: high speed + * HPRT0_SPD_FULL_SPEED: full speed + */ +static void dwc2_change_bus_speed(struct usb_hcd *hcd, int speed) +{ + struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd); + + if (hsotg->params.speed == speed) + return; + + hsotg->params.speed = speed; + queue_work(hsotg->wq_otg, &hsotg->wf_otg); +} + +static void dwc2_free_dev(struct usb_hcd *hcd, struct usb_device *udev) +{ + struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd); + + if (!hsotg->params.change_speed_quirk) + return; + + /* + * On removal, set speed to default high-speed. + */ + if (udev->parent && udev->parent->speed > USB_SPEED_UNKNOWN && + udev->parent->speed < USB_SPEED_HIGH) { + dev_info(hsotg->dev, "Set speed to default high-speed\n"); + dwc2_change_bus_speed(hcd, HPRT0_SPD_HIGH_SPEED); + } +} + +static int dwc2_reset_device(struct usb_hcd *hcd, struct usb_device *udev) +{ + struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd); + + if (!hsotg->params.change_speed_quirk) + return 0; + + if (udev->speed == USB_SPEED_HIGH) { + dev_info(hsotg->dev, "Set speed to high-speed\n"); + dwc2_change_bus_speed(hcd, HPRT0_SPD_HIGH_SPEED); + } else if ((udev->speed == USB_SPEED_FULL || + udev->speed == USB_SPEED_LOW)) { + /* + * Change speed setting to full-speed if there's + * a full-speed or low-speed device plugged in. + */ + dev_info(hsotg->dev, "Set speed to full-speed\n"); + dwc2_change_bus_speed(hcd, HPRT0_SPD_FULL_SPEED); + } + + return 0; +} + +static struct hc_driver dwc2_hc_driver = { + .description = "dwc2_hsotg", + .product_desc = "DWC OTG Controller", + .hcd_priv_size = sizeof(struct wrapper_priv_data), + + .irq = _dwc2_hcd_irq, + .flags = HCD_MEMORY | HCD_USB2 | HCD_BH, + + .start = _dwc2_hcd_start, + .stop = _dwc2_hcd_stop, + .urb_enqueue = _dwc2_hcd_urb_enqueue, + .urb_dequeue = _dwc2_hcd_urb_dequeue, + .endpoint_disable = _dwc2_hcd_endpoint_disable, + .endpoint_reset = _dwc2_hcd_endpoint_reset, + .get_frame_number = _dwc2_hcd_get_frame_number, + + .hub_status_data = _dwc2_hcd_hub_status_data, + .hub_control = _dwc2_hcd_hub_control, + .clear_tt_buffer_complete = _dwc2_hcd_clear_tt_buffer_complete, + + .bus_suspend = _dwc2_hcd_suspend, + .bus_resume = _dwc2_hcd_resume, + + .map_urb_for_dma = dwc2_map_urb_for_dma, + .unmap_urb_for_dma = dwc2_unmap_urb_for_dma, +}; + +/* + * Frees secondary storage associated with the dwc2_hsotg structure contained + * in the struct usb_hcd field + */ +static void dwc2_hcd_free(struct dwc2_hsotg *hsotg) +{ + u32 ahbcfg; + u32 dctl; + int i; + + dev_dbg(hsotg->dev, "DWC OTG HCD FREE\n"); + + /* Free memory for QH/QTD lists */ + dwc2_qh_list_free(hsotg, &hsotg->non_periodic_sched_inactive); + dwc2_qh_list_free(hsotg, &hsotg->non_periodic_sched_waiting); + dwc2_qh_list_free(hsotg, &hsotg->non_periodic_sched_active); + dwc2_qh_list_free(hsotg, &hsotg->periodic_sched_inactive); + dwc2_qh_list_free(hsotg, &hsotg->periodic_sched_ready); + dwc2_qh_list_free(hsotg, &hsotg->periodic_sched_assigned); + dwc2_qh_list_free(hsotg, &hsotg->periodic_sched_queued); + + /* Free memory for the host channels */ + for (i = 0; i < MAX_EPS_CHANNELS; i++) { + struct dwc2_host_chan *chan = hsotg->hc_ptr_array[i]; + + if (chan) { + dev_dbg(hsotg->dev, "HCD Free channel #%i, chan=%p\n", + i, chan); + hsotg->hc_ptr_array[i] = NULL; + kfree(chan); + } + } + + if (hsotg->params.host_dma) { + if (hsotg->status_buf) { + dma_free_coherent(hsotg->dev, DWC2_HCD_STATUS_BUF_SIZE, + hsotg->status_buf, + hsotg->status_buf_dma); + hsotg->status_buf = NULL; + } + } else { + kfree(hsotg->status_buf); + hsotg->status_buf = NULL; + } + + ahbcfg = dwc2_readl(hsotg, GAHBCFG); + + /* Disable all interrupts */ + ahbcfg &= ~GAHBCFG_GLBL_INTR_EN; + dwc2_writel(hsotg, ahbcfg, GAHBCFG); + dwc2_writel(hsotg, 0, GINTMSK); + + if (hsotg->hw_params.snpsid >= DWC2_CORE_REV_3_00a) { + dctl = dwc2_readl(hsotg, DCTL); + dctl |= DCTL_SFTDISCON; + dwc2_writel(hsotg, dctl, DCTL); + } + + if (hsotg->wq_otg) { + if (!cancel_work_sync(&hsotg->wf_otg)) + flush_workqueue(hsotg->wq_otg); + destroy_workqueue(hsotg->wq_otg); + } + + cancel_work_sync(&hsotg->phy_reset_work); + + del_timer(&hsotg->wkp_timer); +} + +static void dwc2_hcd_release(struct dwc2_hsotg *hsotg) +{ + /* Turn off all host-specific interrupts */ + dwc2_disable_host_interrupts(hsotg); + + dwc2_hcd_free(hsotg); +} + +/* + * Initializes the HCD. This function allocates memory for and initializes the + * static parts of the usb_hcd and dwc2_hsotg structures. It also registers the + * USB bus with the core and calls the hc_driver->start() function. It returns + * a negative error on failure. + */ +int dwc2_hcd_init(struct dwc2_hsotg *hsotg) +{ + struct platform_device *pdev = to_platform_device(hsotg->dev); + struct resource *res; + struct usb_hcd *hcd; + struct dwc2_host_chan *channel; + u32 hcfg; + int i, num_channels; + int retval; + + if (usb_disabled()) + return -ENODEV; + + dev_dbg(hsotg->dev, "DWC OTG HCD INIT\n"); + + retval = -ENOMEM; + + hcfg = dwc2_readl(hsotg, HCFG); + dev_dbg(hsotg->dev, "hcfg=%08x\n", hcfg); + +#ifdef CONFIG_USB_DWC2_TRACK_MISSED_SOFS + hsotg->frame_num_array = kcalloc(FRAME_NUM_ARRAY_SIZE, + sizeof(*hsotg->frame_num_array), + GFP_KERNEL); + if (!hsotg->frame_num_array) + goto error1; + hsotg->last_frame_num_array = + kcalloc(FRAME_NUM_ARRAY_SIZE, + sizeof(*hsotg->last_frame_num_array), GFP_KERNEL); + if (!hsotg->last_frame_num_array) + goto error1; +#endif + hsotg->last_frame_num = HFNUM_MAX_FRNUM; + + /* Check if the bus driver or platform code has setup a dma_mask */ + if (hsotg->params.host_dma && + !hsotg->dev->dma_mask) { + dev_warn(hsotg->dev, + "dma_mask not set, disabling DMA\n"); + hsotg->params.host_dma = false; + hsotg->params.dma_desc_enable = false; + } + + /* Set device flags indicating whether the HCD supports DMA */ + if (hsotg->params.host_dma) { + if (dma_set_mask(hsotg->dev, DMA_BIT_MASK(32)) < 0) + dev_warn(hsotg->dev, "can't set DMA mask\n"); + if (dma_set_coherent_mask(hsotg->dev, DMA_BIT_MASK(32)) < 0) + dev_warn(hsotg->dev, "can't set coherent DMA mask\n"); + } + + if (hsotg->params.change_speed_quirk) { + dwc2_hc_driver.free_dev = dwc2_free_dev; + dwc2_hc_driver.reset_device = dwc2_reset_device; + } + + if (hsotg->params.host_dma) + dwc2_hc_driver.flags |= HCD_DMA; + + hcd = usb_create_hcd(&dwc2_hc_driver, hsotg->dev, dev_name(hsotg->dev)); + if (!hcd) + goto error1; + + hcd->has_tt = 1; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + retval = -EINVAL; + goto error2; + } + hcd->rsrc_start = res->start; + hcd->rsrc_len = resource_size(res); + + ((struct wrapper_priv_data *)&hcd->hcd_priv)->hsotg = hsotg; + hsotg->priv = hcd; + + /* + * Disable the global interrupt until all the interrupt handlers are + * installed + */ + dwc2_disable_global_interrupts(hsotg); + + /* Initialize the DWC_otg core, and select the Phy type */ + retval = dwc2_core_init(hsotg, true); + if (retval) + goto error2; + + /* Create new workqueue and init work */ + retval = -ENOMEM; + hsotg->wq_otg = alloc_ordered_workqueue("dwc2", 0); + if (!hsotg->wq_otg) { + dev_err(hsotg->dev, "Failed to create workqueue\n"); + goto error2; + } + INIT_WORK(&hsotg->wf_otg, dwc2_conn_id_status_change); + + timer_setup(&hsotg->wkp_timer, dwc2_wakeup_detected, 0); + + /* Initialize the non-periodic schedule */ + INIT_LIST_HEAD(&hsotg->non_periodic_sched_inactive); + INIT_LIST_HEAD(&hsotg->non_periodic_sched_waiting); + INIT_LIST_HEAD(&hsotg->non_periodic_sched_active); + + /* Initialize the periodic schedule */ + INIT_LIST_HEAD(&hsotg->periodic_sched_inactive); + INIT_LIST_HEAD(&hsotg->periodic_sched_ready); + INIT_LIST_HEAD(&hsotg->periodic_sched_assigned); + INIT_LIST_HEAD(&hsotg->periodic_sched_queued); + + INIT_LIST_HEAD(&hsotg->split_order); + + /* + * Create a host channel descriptor for each host channel implemented + * in the controller. Initialize the channel descriptor array. + */ + INIT_LIST_HEAD(&hsotg->free_hc_list); + num_channels = hsotg->params.host_channels; + memset(&hsotg->hc_ptr_array[0], 0, sizeof(hsotg->hc_ptr_array)); + + for (i = 0; i < num_channels; i++) { + channel = kzalloc(sizeof(*channel), GFP_KERNEL); + if (!channel) + goto error3; + channel->hc_num = i; + INIT_LIST_HEAD(&channel->split_order_list_entry); + hsotg->hc_ptr_array[i] = channel; + } + + /* Initialize work */ + INIT_DELAYED_WORK(&hsotg->start_work, dwc2_hcd_start_func); + INIT_DELAYED_WORK(&hsotg->reset_work, dwc2_hcd_reset_func); + INIT_WORK(&hsotg->phy_reset_work, dwc2_hcd_phy_reset_func); + + /* + * Allocate space for storing data on status transactions. Normally no + * data is sent, but this space acts as a bit bucket. This must be + * done after usb_add_hcd since that function allocates the DMA buffer + * pool. + */ + if (hsotg->params.host_dma) + hsotg->status_buf = dma_alloc_coherent(hsotg->dev, + DWC2_HCD_STATUS_BUF_SIZE, + &hsotg->status_buf_dma, GFP_KERNEL); + else + hsotg->status_buf = kzalloc(DWC2_HCD_STATUS_BUF_SIZE, + GFP_KERNEL); + + if (!hsotg->status_buf) + goto error3; + + /* + * Create kmem caches to handle descriptor buffers in descriptor + * DMA mode. + * Alignment must be set to 512 bytes. + */ + if (hsotg->params.dma_desc_enable || + hsotg->params.dma_desc_fs_enable) { + hsotg->desc_gen_cache = kmem_cache_create("dwc2-gen-desc", + sizeof(struct dwc2_dma_desc) * + MAX_DMA_DESC_NUM_GENERIC, 512, SLAB_CACHE_DMA, + NULL); + if (!hsotg->desc_gen_cache) { + dev_err(hsotg->dev, + "unable to create dwc2 generic desc cache\n"); + + /* + * Disable descriptor dma mode since it will not be + * usable. + */ + hsotg->params.dma_desc_enable = false; + hsotg->params.dma_desc_fs_enable = false; + } + + hsotg->desc_hsisoc_cache = kmem_cache_create("dwc2-hsisoc-desc", + sizeof(struct dwc2_dma_desc) * + MAX_DMA_DESC_NUM_HS_ISOC, 512, 0, NULL); + if (!hsotg->desc_hsisoc_cache) { + dev_err(hsotg->dev, + "unable to create dwc2 hs isoc desc cache\n"); + + kmem_cache_destroy(hsotg->desc_gen_cache); + + /* + * Disable descriptor dma mode since it will not be + * usable. + */ + hsotg->params.dma_desc_enable = false; + hsotg->params.dma_desc_fs_enable = false; + } + } + + if (hsotg->params.host_dma) { + /* + * Create kmem caches to handle non-aligned buffer + * in Buffer DMA mode. + */ + hsotg->unaligned_cache = kmem_cache_create("dwc2-unaligned-dma", + DWC2_KMEM_UNALIGNED_BUF_SIZE, 4, + SLAB_CACHE_DMA, NULL); + if (!hsotg->unaligned_cache) + dev_err(hsotg->dev, + "unable to create dwc2 unaligned cache\n"); + } + + hsotg->otg_port = 1; + hsotg->frame_list = NULL; + hsotg->frame_list_dma = 0; + hsotg->periodic_qh_count = 0; + + /* Initiate lx_state to L3 disconnected state */ + hsotg->lx_state = DWC2_L3; + + hcd->self.otg_port = hsotg->otg_port; + + /* Don't support SG list at this point */ + hcd->self.sg_tablesize = 0; + + hcd->tpl_support = of_usb_host_tpl_support(hsotg->dev->of_node); + + if (!IS_ERR_OR_NULL(hsotg->uphy)) + otg_set_host(hsotg->uphy->otg, &hcd->self); + + /* + * Finish generic HCD initialization and start the HCD. This function + * allocates the DMA buffer pool, registers the USB bus, requests the + * IRQ line, and calls hcd_start method. + */ + retval = usb_add_hcd(hcd, hsotg->irq, IRQF_SHARED); + if (retval < 0) + goto error4; + + device_wakeup_enable(hcd->self.controller); + + dwc2_hcd_dump_state(hsotg); + + dwc2_enable_global_interrupts(hsotg); + + return 0; + +error4: + kmem_cache_destroy(hsotg->unaligned_cache); + kmem_cache_destroy(hsotg->desc_hsisoc_cache); + kmem_cache_destroy(hsotg->desc_gen_cache); +error3: + dwc2_hcd_release(hsotg); +error2: + usb_put_hcd(hcd); +error1: + +#ifdef CONFIG_USB_DWC2_TRACK_MISSED_SOFS + kfree(hsotg->last_frame_num_array); + kfree(hsotg->frame_num_array); +#endif + + dev_err(hsotg->dev, "%s() FAILED, returning %d\n", __func__, retval); + return retval; +} + +/* + * Removes the HCD. + * Frees memory and resources associated with the HCD and deregisters the bus. + */ +void dwc2_hcd_remove(struct dwc2_hsotg *hsotg) +{ + struct usb_hcd *hcd; + + dev_dbg(hsotg->dev, "DWC OTG HCD REMOVE\n"); + + hcd = dwc2_hsotg_to_hcd(hsotg); + dev_dbg(hsotg->dev, "hsotg->hcd = %p\n", hcd); + + if (!hcd) { + dev_dbg(hsotg->dev, "%s: dwc2_hsotg_to_hcd(hsotg) NULL!\n", + __func__); + return; + } + + if (!IS_ERR_OR_NULL(hsotg->uphy)) + otg_set_host(hsotg->uphy->otg, NULL); + + usb_remove_hcd(hcd); + hsotg->priv = NULL; + + kmem_cache_destroy(hsotg->unaligned_cache); + kmem_cache_destroy(hsotg->desc_hsisoc_cache); + kmem_cache_destroy(hsotg->desc_gen_cache); + + dwc2_hcd_release(hsotg); + usb_put_hcd(hcd); + +#ifdef CONFIG_USB_DWC2_TRACK_MISSED_SOFS + kfree(hsotg->last_frame_num_array); + kfree(hsotg->frame_num_array); +#endif +} + +/** + * dwc2_backup_host_registers() - Backup controller host registers. + * When suspending usb bus, registers needs to be backuped + * if controller power is disabled once suspended. + * + * @hsotg: Programming view of the DWC_otg controller + */ +int dwc2_backup_host_registers(struct dwc2_hsotg *hsotg) +{ + struct dwc2_hregs_backup *hr; + int i; + + dev_dbg(hsotg->dev, "%s\n", __func__); + + /* Backup Host regs */ + hr = &hsotg->hr_backup; + hr->hcfg = dwc2_readl(hsotg, HCFG); + hr->haintmsk = dwc2_readl(hsotg, HAINTMSK); + for (i = 0; i < hsotg->params.host_channels; ++i) + hr->hcintmsk[i] = dwc2_readl(hsotg, HCINTMSK(i)); + + hr->hprt0 = dwc2_read_hprt0(hsotg); + hr->hfir = dwc2_readl(hsotg, HFIR); + hr->hptxfsiz = dwc2_readl(hsotg, HPTXFSIZ); + hr->valid = true; + + return 0; +} + +/** + * dwc2_restore_host_registers() - Restore controller host registers. + * When resuming usb bus, device registers needs to be restored + * if controller power were disabled. + * + * @hsotg: Programming view of the DWC_otg controller + */ +int dwc2_restore_host_registers(struct dwc2_hsotg *hsotg) +{ + struct dwc2_hregs_backup *hr; + int i; + + dev_dbg(hsotg->dev, "%s\n", __func__); + + /* Restore host regs */ + hr = &hsotg->hr_backup; + if (!hr->valid) { + dev_err(hsotg->dev, "%s: no host registers to restore\n", + __func__); + return -EINVAL; + } + hr->valid = false; + + dwc2_writel(hsotg, hr->hcfg, HCFG); + dwc2_writel(hsotg, hr->haintmsk, HAINTMSK); + + for (i = 0; i < hsotg->params.host_channels; ++i) + dwc2_writel(hsotg, hr->hcintmsk[i], HCINTMSK(i)); + + dwc2_writel(hsotg, hr->hprt0, HPRT0); + dwc2_writel(hsotg, hr->hfir, HFIR); + dwc2_writel(hsotg, hr->hptxfsiz, HPTXFSIZ); + hsotg->frame_number = 0; + + return 0; +} + +/** + * dwc2_host_enter_hibernation() - Put controller in Hibernation. + * + * @hsotg: Programming view of the DWC_otg controller + */ +int dwc2_host_enter_hibernation(struct dwc2_hsotg *hsotg) +{ + unsigned long flags; + int ret = 0; + u32 hprt0; + u32 pcgcctl; + u32 gusbcfg; + u32 gpwrdn; + + dev_dbg(hsotg->dev, "Preparing host for hibernation\n"); + ret = dwc2_backup_global_registers(hsotg); + if (ret) { + dev_err(hsotg->dev, "%s: failed to backup global registers\n", + __func__); + return ret; + } + ret = dwc2_backup_host_registers(hsotg); + if (ret) { + dev_err(hsotg->dev, "%s: failed to backup host registers\n", + __func__); + return ret; + } + + /* Enter USB Suspend Mode */ + hprt0 = dwc2_readl(hsotg, HPRT0); + hprt0 |= HPRT0_SUSP; + hprt0 &= ~HPRT0_ENA; + dwc2_writel(hsotg, hprt0, HPRT0); + + /* Wait for the HPRT0.PrtSusp register field to be set */ + if (dwc2_hsotg_wait_bit_set(hsotg, HPRT0, HPRT0_SUSP, 5000)) + dev_warn(hsotg->dev, "Suspend wasn't generated\n"); + + /* + * We need to disable interrupts to prevent servicing of any IRQ + * during going to hibernation + */ + spin_lock_irqsave(&hsotg->lock, flags); + hsotg->lx_state = DWC2_L2; + + gusbcfg = dwc2_readl(hsotg, GUSBCFG); + if (gusbcfg & GUSBCFG_ULPI_UTMI_SEL) { + /* ULPI interface */ + /* Suspend the Phy Clock */ + pcgcctl = dwc2_readl(hsotg, PCGCTL); + pcgcctl |= PCGCTL_STOPPCLK; + dwc2_writel(hsotg, pcgcctl, PCGCTL); + udelay(10); + + gpwrdn = dwc2_readl(hsotg, GPWRDN); + gpwrdn |= GPWRDN_PMUACTV; + dwc2_writel(hsotg, gpwrdn, GPWRDN); + udelay(10); + } else { + /* UTMI+ Interface */ + gpwrdn = dwc2_readl(hsotg, GPWRDN); + gpwrdn |= GPWRDN_PMUACTV; + dwc2_writel(hsotg, gpwrdn, GPWRDN); + udelay(10); + + pcgcctl = dwc2_readl(hsotg, PCGCTL); + pcgcctl |= PCGCTL_STOPPCLK; + dwc2_writel(hsotg, pcgcctl, PCGCTL); + udelay(10); + } + + /* Enable interrupts from wake up logic */ + gpwrdn = dwc2_readl(hsotg, GPWRDN); + gpwrdn |= GPWRDN_PMUINTSEL; + dwc2_writel(hsotg, gpwrdn, GPWRDN); + udelay(10); + + /* Unmask host mode interrupts in GPWRDN */ + gpwrdn = dwc2_readl(hsotg, GPWRDN); + gpwrdn |= GPWRDN_DISCONN_DET_MSK; + gpwrdn |= GPWRDN_LNSTSCHG_MSK; + gpwrdn |= GPWRDN_STS_CHGINT_MSK; + dwc2_writel(hsotg, gpwrdn, GPWRDN); + udelay(10); + + /* Enable Power Down Clamp */ + gpwrdn = dwc2_readl(hsotg, GPWRDN); + gpwrdn |= GPWRDN_PWRDNCLMP; + dwc2_writel(hsotg, gpwrdn, GPWRDN); + udelay(10); + + /* Switch off VDD */ + gpwrdn = dwc2_readl(hsotg, GPWRDN); + gpwrdn |= GPWRDN_PWRDNSWTCH; + dwc2_writel(hsotg, gpwrdn, GPWRDN); + + hsotg->hibernated = 1; + hsotg->bus_suspended = 1; + dev_dbg(hsotg->dev, "Host hibernation completed\n"); + spin_unlock_irqrestore(&hsotg->lock, flags); + return ret; +} + +/* + * dwc2_host_exit_hibernation() + * + * @hsotg: Programming view of the DWC_otg controller + * @rem_wakeup: indicates whether resume is initiated by Device or Host. + * @param reset: indicates whether resume is initiated by Reset. + * + * Return: non-zero if failed to enter to hibernation. + * + * This function is for exiting from Host mode hibernation by + * Host Initiated Resume/Reset and Device Initiated Remote-Wakeup. + */ +int dwc2_host_exit_hibernation(struct dwc2_hsotg *hsotg, int rem_wakeup, + int reset) +{ + u32 gpwrdn; + u32 hprt0; + int ret = 0; + struct dwc2_gregs_backup *gr; + struct dwc2_hregs_backup *hr; + + gr = &hsotg->gr_backup; + hr = &hsotg->hr_backup; + + dev_dbg(hsotg->dev, + "%s: called with rem_wakeup = %d reset = %d\n", + __func__, rem_wakeup, reset); + + dwc2_hib_restore_common(hsotg, rem_wakeup, 1); + hsotg->hibernated = 0; + + /* + * This step is not described in functional spec but if not wait for + * this delay, mismatch interrupts occurred because just after restore + * core is in Device mode(gintsts.curmode == 0) + */ + mdelay(100); + + /* Clear all pending interupts */ + dwc2_writel(hsotg, 0xffffffff, GINTSTS); + + /* De-assert Restore */ + gpwrdn = dwc2_readl(hsotg, GPWRDN); + gpwrdn &= ~GPWRDN_RESTORE; + dwc2_writel(hsotg, gpwrdn, GPWRDN); + udelay(10); + + /* Restore GUSBCFG, HCFG */ + dwc2_writel(hsotg, gr->gusbcfg, GUSBCFG); + dwc2_writel(hsotg, hr->hcfg, HCFG); + + /* De-assert Wakeup Logic */ + gpwrdn = dwc2_readl(hsotg, GPWRDN); + gpwrdn &= ~GPWRDN_PMUACTV; + dwc2_writel(hsotg, gpwrdn, GPWRDN); + udelay(10); + + hprt0 = hr->hprt0; + hprt0 |= HPRT0_PWR; + hprt0 &= ~HPRT0_ENA; + hprt0 &= ~HPRT0_SUSP; + dwc2_writel(hsotg, hprt0, HPRT0); + + hprt0 = hr->hprt0; + hprt0 |= HPRT0_PWR; + hprt0 &= ~HPRT0_ENA; + hprt0 &= ~HPRT0_SUSP; + + if (reset) { + hprt0 |= HPRT0_RST; + dwc2_writel(hsotg, hprt0, HPRT0); + + /* Wait for Resume time and then program HPRT again */ + mdelay(60); + hprt0 &= ~HPRT0_RST; + dwc2_writel(hsotg, hprt0, HPRT0); + } else { + hprt0 |= HPRT0_RES; + dwc2_writel(hsotg, hprt0, HPRT0); + + /* Wait for Resume time and then program HPRT again */ + mdelay(100); + hprt0 &= ~HPRT0_RES; + dwc2_writel(hsotg, hprt0, HPRT0); + } + /* Clear all interrupt status */ + hprt0 = dwc2_readl(hsotg, HPRT0); + hprt0 |= HPRT0_CONNDET; + hprt0 |= HPRT0_ENACHG; + hprt0 &= ~HPRT0_ENA; + dwc2_writel(hsotg, hprt0, HPRT0); + + hprt0 = dwc2_readl(hsotg, HPRT0); + + /* Clear all pending interupts */ + dwc2_writel(hsotg, 0xffffffff, GINTSTS); + + /* Restore global registers */ + ret = dwc2_restore_global_registers(hsotg); + if (ret) { + dev_err(hsotg->dev, "%s: failed to restore registers\n", + __func__); + return ret; + } + + /* Restore host registers */ + ret = dwc2_restore_host_registers(hsotg); + if (ret) { + dev_err(hsotg->dev, "%s: failed to restore host registers\n", + __func__); + return ret; + } + + if (rem_wakeup) { + dwc2_hcd_rem_wakeup(hsotg); + /* + * Change "port_connect_status_change" flag to re-enumerate, + * because after exit from hibernation port connection status + * is not detected. + */ + hsotg->flags.b.port_connect_status_change = 1; + } + + hsotg->hibernated = 0; + hsotg->bus_suspended = 0; + hsotg->lx_state = DWC2_L0; + dev_dbg(hsotg->dev, "Host hibernation restore complete\n"); + return ret; +} + +bool dwc2_host_can_poweroff_phy(struct dwc2_hsotg *dwc2) +{ + struct usb_device *root_hub = dwc2_hsotg_to_hcd(dwc2)->self.root_hub; + + /* If the controller isn't allowed to wakeup then we can power off. */ + if (!device_may_wakeup(dwc2->dev)) + return true; + + /* + * We don't want to power off the PHY if something under the + * root hub has wakeup enabled. + */ + if (usb_wakeup_enabled_descendants(root_hub)) + return false; + + /* No reason to keep the PHY powered, so allow poweroff */ + return true; +} + +/** + * dwc2_host_enter_partial_power_down() - Put controller in partial + * power down. + * + * @hsotg: Programming view of the DWC_otg controller + * + * Return: non-zero if failed to enter host partial power down. + * + * This function is for entering Host mode partial power down. + */ +int dwc2_host_enter_partial_power_down(struct dwc2_hsotg *hsotg) +{ + u32 pcgcctl; + u32 hprt0; + int ret = 0; + + dev_dbg(hsotg->dev, "Entering host partial power down started.\n"); + + /* Put this port in suspend mode. */ + hprt0 = dwc2_read_hprt0(hsotg); + hprt0 |= HPRT0_SUSP; + dwc2_writel(hsotg, hprt0, HPRT0); + udelay(5); + + /* Wait for the HPRT0.PrtSusp register field to be set */ + if (dwc2_hsotg_wait_bit_set(hsotg, HPRT0, HPRT0_SUSP, 3000)) + dev_warn(hsotg->dev, "Suspend wasn't generated\n"); + + /* Backup all registers */ + ret = dwc2_backup_global_registers(hsotg); + if (ret) { + dev_err(hsotg->dev, "%s: failed to backup global registers\n", + __func__); + return ret; + } + + ret = dwc2_backup_host_registers(hsotg); + if (ret) { + dev_err(hsotg->dev, "%s: failed to backup host registers\n", + __func__); + return ret; + } + + /* + * Clear any pending interrupts since dwc2 will not be able to + * clear them after entering partial_power_down. + */ + dwc2_writel(hsotg, 0xffffffff, GINTSTS); + + /* Put the controller in low power state */ + pcgcctl = dwc2_readl(hsotg, PCGCTL); + + pcgcctl |= PCGCTL_PWRCLMP; + dwc2_writel(hsotg, pcgcctl, PCGCTL); + udelay(5); + + pcgcctl |= PCGCTL_RSTPDWNMODULE; + dwc2_writel(hsotg, pcgcctl, PCGCTL); + udelay(5); + + pcgcctl |= PCGCTL_STOPPCLK; + dwc2_writel(hsotg, pcgcctl, PCGCTL); + + /* Set in_ppd flag to 1 as here core enters suspend. */ + hsotg->in_ppd = 1; + hsotg->lx_state = DWC2_L2; + hsotg->bus_suspended = true; + + dev_dbg(hsotg->dev, "Entering host partial power down completed.\n"); + + return ret; +} + +/* + * dwc2_host_exit_partial_power_down() - Exit controller from host partial + * power down. + * + * @hsotg: Programming view of the DWC_otg controller + * @rem_wakeup: indicates whether resume is initiated by Reset. + * @restore: indicates whether need to restore the registers or not. + * + * Return: non-zero if failed to exit host partial power down. + * + * This function is for exiting from Host mode partial power down. + */ +int dwc2_host_exit_partial_power_down(struct dwc2_hsotg *hsotg, + int rem_wakeup, bool restore) +{ + u32 pcgcctl; + int ret = 0; + u32 hprt0; + + dev_dbg(hsotg->dev, "Exiting host partial power down started.\n"); + + pcgcctl = dwc2_readl(hsotg, PCGCTL); + pcgcctl &= ~PCGCTL_STOPPCLK; + dwc2_writel(hsotg, pcgcctl, PCGCTL); + udelay(5); + + pcgcctl = dwc2_readl(hsotg, PCGCTL); + pcgcctl &= ~PCGCTL_PWRCLMP; + dwc2_writel(hsotg, pcgcctl, PCGCTL); + udelay(5); + + pcgcctl = dwc2_readl(hsotg, PCGCTL); + pcgcctl &= ~PCGCTL_RSTPDWNMODULE; + dwc2_writel(hsotg, pcgcctl, PCGCTL); + + udelay(100); + if (restore) { + ret = dwc2_restore_global_registers(hsotg); + if (ret) { + dev_err(hsotg->dev, "%s: failed to restore registers\n", + __func__); + return ret; + } + + ret = dwc2_restore_host_registers(hsotg); + if (ret) { + dev_err(hsotg->dev, "%s: failed to restore host registers\n", + __func__); + return ret; + } + } + + /* Drive resume signaling and exit suspend mode on the port. */ + hprt0 = dwc2_read_hprt0(hsotg); + hprt0 |= HPRT0_RES; + hprt0 &= ~HPRT0_SUSP; + dwc2_writel(hsotg, hprt0, HPRT0); + udelay(5); + + if (!rem_wakeup) { + /* Stop driveing resume signaling on the port. */ + hprt0 = dwc2_read_hprt0(hsotg); + hprt0 &= ~HPRT0_RES; + dwc2_writel(hsotg, hprt0, HPRT0); + + hsotg->bus_suspended = false; + } else { + /* Turn on the port power bit. */ + hprt0 = dwc2_read_hprt0(hsotg); + hprt0 |= HPRT0_PWR; + dwc2_writel(hsotg, hprt0, HPRT0); + + /* Connect hcd. */ + dwc2_hcd_connect(hsotg); + + mod_timer(&hsotg->wkp_timer, + jiffies + msecs_to_jiffies(71)); + } + + /* Set lx_state to and in_ppd to 0 as here core exits from suspend. */ + hsotg->in_ppd = 0; + hsotg->lx_state = DWC2_L0; + + dev_dbg(hsotg->dev, "Exiting host partial power down completed.\n"); + return ret; +} + +/** + * dwc2_host_enter_clock_gating() - Put controller in clock gating. + * + * @hsotg: Programming view of the DWC_otg controller + * + * This function is for entering Host mode clock gating. + */ +void dwc2_host_enter_clock_gating(struct dwc2_hsotg *hsotg) +{ + u32 hprt0; + u32 pcgctl; + + dev_dbg(hsotg->dev, "Entering host clock gating.\n"); + + /* Put this port in suspend mode. */ + hprt0 = dwc2_read_hprt0(hsotg); + hprt0 |= HPRT0_SUSP; + dwc2_writel(hsotg, hprt0, HPRT0); + + /* Set the Phy Clock bit as suspend is received. */ + pcgctl = dwc2_readl(hsotg, PCGCTL); + pcgctl |= PCGCTL_STOPPCLK; + dwc2_writel(hsotg, pcgctl, PCGCTL); + udelay(5); + + /* Set the Gate hclk as suspend is received. */ + pcgctl = dwc2_readl(hsotg, PCGCTL); + pcgctl |= PCGCTL_GATEHCLK; + dwc2_writel(hsotg, pcgctl, PCGCTL); + udelay(5); + + hsotg->bus_suspended = true; + hsotg->lx_state = DWC2_L2; +} + +/** + * dwc2_host_exit_clock_gating() - Exit controller from clock gating. + * + * @hsotg: Programming view of the DWC_otg controller + * @rem_wakeup: indicates whether resume is initiated by remote wakeup + * + * This function is for exiting Host mode clock gating. + */ +void dwc2_host_exit_clock_gating(struct dwc2_hsotg *hsotg, int rem_wakeup) +{ + u32 hprt0; + u32 pcgctl; + + dev_dbg(hsotg->dev, "Exiting host clock gating.\n"); + + /* Clear the Gate hclk. */ + pcgctl = dwc2_readl(hsotg, PCGCTL); + pcgctl &= ~PCGCTL_GATEHCLK; + dwc2_writel(hsotg, pcgctl, PCGCTL); + udelay(5); + + /* Phy Clock bit. */ + pcgctl = dwc2_readl(hsotg, PCGCTL); + pcgctl &= ~PCGCTL_STOPPCLK; + dwc2_writel(hsotg, pcgctl, PCGCTL); + udelay(5); + + /* Drive resume signaling and exit suspend mode on the port. */ + hprt0 = dwc2_read_hprt0(hsotg); + hprt0 |= HPRT0_RES; + hprt0 &= ~HPRT0_SUSP; + dwc2_writel(hsotg, hprt0, HPRT0); + udelay(5); + + if (!rem_wakeup) { + /* In case of port resume need to wait for 40 ms */ + msleep(USB_RESUME_TIMEOUT); + + /* Stop driveing resume signaling on the port. */ + hprt0 = dwc2_read_hprt0(hsotg); + hprt0 &= ~HPRT0_RES; + dwc2_writel(hsotg, hprt0, HPRT0); + + hsotg->bus_suspended = false; + hsotg->lx_state = DWC2_L0; + } else { + mod_timer(&hsotg->wkp_timer, + jiffies + msecs_to_jiffies(71)); + } +} |