diff options
Diffstat (limited to 'drivers/usb/dwc2/gadget.c')
| -rw-r--r-- | drivers/usb/dwc2/gadget.c | 5676 |
1 files changed, 5676 insertions, 0 deletions
diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c new file mode 100644 index 0000000000..b517a7216d --- /dev/null +++ b/drivers/usb/dwc2/gadget.c @@ -0,0 +1,5676 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2011 Samsung Electronics Co., Ltd. + * http://www.samsung.com + * + * Copyright 2008 Openmoko, Inc. + * Copyright 2008 Simtec Electronics + * Ben Dooks <ben@simtec.co.uk> + * http://armlinux.simtec.co.uk/ + * + * S3C USB2.0 High-speed / OtG driver + */ + +#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/mutex.h> +#include <linux/seq_file.h> +#include <linux/delay.h> +#include <linux/io.h> +#include <linux/slab.h> + +#include <linux/usb/ch9.h> +#include <linux/usb/gadget.h> +#include <linux/usb/phy.h> +#include <linux/usb/composite.h> + + +#include "core.h" +#include "hw.h" + +/* conversion functions */ +static inline struct dwc2_hsotg_req *our_req(struct usb_request *req) +{ + return container_of(req, struct dwc2_hsotg_req, req); +} + +static inline struct dwc2_hsotg_ep *our_ep(struct usb_ep *ep) +{ + return container_of(ep, struct dwc2_hsotg_ep, ep); +} + +static inline struct dwc2_hsotg *to_hsotg(struct usb_gadget *gadget) +{ + return container_of(gadget, struct dwc2_hsotg, gadget); +} + +static inline void dwc2_set_bit(struct dwc2_hsotg *hsotg, u32 offset, u32 val) +{ + dwc2_writel(hsotg, dwc2_readl(hsotg, offset) | val, offset); +} + +static inline void dwc2_clear_bit(struct dwc2_hsotg *hsotg, u32 offset, u32 val) +{ + dwc2_writel(hsotg, dwc2_readl(hsotg, offset) & ~val, offset); +} + +static inline struct dwc2_hsotg_ep *index_to_ep(struct dwc2_hsotg *hsotg, + u32 ep_index, u32 dir_in) +{ + if (dir_in) + return hsotg->eps_in[ep_index]; + else + return hsotg->eps_out[ep_index]; +} + +/* forward declaration of functions */ +static void dwc2_hsotg_dump(struct dwc2_hsotg *hsotg); + +/** + * using_dma - return the DMA status of the driver. + * @hsotg: The driver state. + * + * Return true if we're using DMA. + * + * Currently, we have the DMA support code worked into everywhere + * that needs it, but the AMBA DMA implementation in the hardware can + * only DMA from 32bit aligned addresses. This means that gadgets such + * as the CDC Ethernet cannot work as they often pass packets which are + * not 32bit aligned. + * + * Unfortunately the choice to use DMA or not is global to the controller + * and seems to be only settable when the controller is being put through + * a core reset. This means we either need to fix the gadgets to take + * account of DMA alignment, or add bounce buffers (yuerk). + * + * g_using_dma is set depending on dts flag. + */ +static inline bool using_dma(struct dwc2_hsotg *hsotg) +{ + return hsotg->params.g_dma; +} + +/* + * using_desc_dma - return the descriptor DMA status of the driver. + * @hsotg: The driver state. + * + * Return true if we're using descriptor DMA. + */ +static inline bool using_desc_dma(struct dwc2_hsotg *hsotg) +{ + return hsotg->params.g_dma_desc; +} + +/** + * dwc2_gadget_incr_frame_num - Increments the targeted frame number. + * @hs_ep: The endpoint + * + * This function will also check if the frame number overruns DSTS_SOFFN_LIMIT. + * If an overrun occurs it will wrap the value and set the frame_overrun flag. + */ +static inline void dwc2_gadget_incr_frame_num(struct dwc2_hsotg_ep *hs_ep) +{ + struct dwc2_hsotg *hsotg = hs_ep->parent; + u16 limit = DSTS_SOFFN_LIMIT; + + if (hsotg->gadget.speed != USB_SPEED_HIGH) + limit >>= 3; + + hs_ep->target_frame += hs_ep->interval; + if (hs_ep->target_frame > limit) { + hs_ep->frame_overrun = true; + hs_ep->target_frame &= limit; + } else { + hs_ep->frame_overrun = false; + } +} + +/** + * dwc2_gadget_dec_frame_num_by_one - Decrements the targeted frame number + * by one. + * @hs_ep: The endpoint. + * + * This function used in service interval based scheduling flow to calculate + * descriptor frame number filed value. For service interval mode frame + * number in descriptor should point to last (u)frame in the interval. + * + */ +static inline void dwc2_gadget_dec_frame_num_by_one(struct dwc2_hsotg_ep *hs_ep) +{ + struct dwc2_hsotg *hsotg = hs_ep->parent; + u16 limit = DSTS_SOFFN_LIMIT; + + if (hsotg->gadget.speed != USB_SPEED_HIGH) + limit >>= 3; + + if (hs_ep->target_frame) + hs_ep->target_frame -= 1; + else + hs_ep->target_frame = limit; +} + +/** + * dwc2_hsotg_en_gsint - enable one or more of the general interrupt + * @hsotg: The device state + * @ints: A bitmask of the interrupts to enable + */ +static void dwc2_hsotg_en_gsint(struct dwc2_hsotg *hsotg, u32 ints) +{ + u32 gsintmsk = dwc2_readl(hsotg, GINTMSK); + u32 new_gsintmsk; + + new_gsintmsk = gsintmsk | ints; + + if (new_gsintmsk != gsintmsk) { + dev_dbg(hsotg->dev, "gsintmsk now 0x%08x\n", new_gsintmsk); + dwc2_writel(hsotg, new_gsintmsk, GINTMSK); + } +} + +/** + * dwc2_hsotg_disable_gsint - disable one or more of the general interrupt + * @hsotg: The device state + * @ints: A bitmask of the interrupts to enable + */ +static void dwc2_hsotg_disable_gsint(struct dwc2_hsotg *hsotg, u32 ints) +{ + u32 gsintmsk = dwc2_readl(hsotg, GINTMSK); + u32 new_gsintmsk; + + new_gsintmsk = gsintmsk & ~ints; + + if (new_gsintmsk != gsintmsk) + dwc2_writel(hsotg, new_gsintmsk, GINTMSK); +} + +/** + * dwc2_hsotg_ctrl_epint - enable/disable an endpoint irq + * @hsotg: The device state + * @ep: The endpoint index + * @dir_in: True if direction is in. + * @en: The enable value, true to enable + * + * Set or clear the mask for an individual endpoint's interrupt + * request. + */ +static void dwc2_hsotg_ctrl_epint(struct dwc2_hsotg *hsotg, + unsigned int ep, unsigned int dir_in, + unsigned int en) +{ + unsigned long flags; + u32 bit = 1 << ep; + u32 daint; + + if (!dir_in) + bit <<= 16; + + local_irq_save(flags); + daint = dwc2_readl(hsotg, DAINTMSK); + if (en) + daint |= bit; + else + daint &= ~bit; + dwc2_writel(hsotg, daint, DAINTMSK); + local_irq_restore(flags); +} + +/** + * dwc2_hsotg_tx_fifo_count - return count of TX FIFOs in device mode + * + * @hsotg: Programming view of the DWC_otg controller + */ +int dwc2_hsotg_tx_fifo_count(struct dwc2_hsotg *hsotg) +{ + if (hsotg->hw_params.en_multiple_tx_fifo) + /* In dedicated FIFO mode we need count of IN EPs */ + return hsotg->hw_params.num_dev_in_eps; + else + /* In shared FIFO mode we need count of Periodic IN EPs */ + return hsotg->hw_params.num_dev_perio_in_ep; +} + +/** + * dwc2_hsotg_tx_fifo_total_depth - return total FIFO depth available for + * device mode TX FIFOs + * + * @hsotg: Programming view of the DWC_otg controller + */ +int dwc2_hsotg_tx_fifo_total_depth(struct dwc2_hsotg *hsotg) +{ + int addr; + int tx_addr_max; + u32 np_tx_fifo_size; + + np_tx_fifo_size = min_t(u32, hsotg->hw_params.dev_nperio_tx_fifo_size, + hsotg->params.g_np_tx_fifo_size); + + /* Get Endpoint Info Control block size in DWORDs. */ + tx_addr_max = hsotg->hw_params.total_fifo_size; + + addr = hsotg->params.g_rx_fifo_size + np_tx_fifo_size; + if (tx_addr_max <= addr) + return 0; + + return tx_addr_max - addr; +} + +/** + * dwc2_gadget_wkup_alert_handler - Handler for WKUP_ALERT interrupt + * + * @hsotg: Programming view of the DWC_otg controller + * + */ +static void dwc2_gadget_wkup_alert_handler(struct dwc2_hsotg *hsotg) +{ + u32 gintsts2; + u32 gintmsk2; + + gintsts2 = dwc2_readl(hsotg, GINTSTS2); + gintmsk2 = dwc2_readl(hsotg, GINTMSK2); + gintsts2 &= gintmsk2; + + if (gintsts2 & GINTSTS2_WKUP_ALERT_INT) { + dev_dbg(hsotg->dev, "%s: Wkup_Alert_Int\n", __func__); + dwc2_set_bit(hsotg, GINTSTS2, GINTSTS2_WKUP_ALERT_INT); + dwc2_set_bit(hsotg, DCTL, DCTL_RMTWKUPSIG); + } +} + +/** + * dwc2_hsotg_tx_fifo_average_depth - returns average depth of device mode + * TX FIFOs + * + * @hsotg: Programming view of the DWC_otg controller + */ +int dwc2_hsotg_tx_fifo_average_depth(struct dwc2_hsotg *hsotg) +{ + int tx_fifo_count; + int tx_fifo_depth; + + tx_fifo_depth = dwc2_hsotg_tx_fifo_total_depth(hsotg); + + tx_fifo_count = dwc2_hsotg_tx_fifo_count(hsotg); + + if (!tx_fifo_count) + return tx_fifo_depth; + else + return tx_fifo_depth / tx_fifo_count; +} + +/** + * dwc2_hsotg_init_fifo - initialise non-periodic FIFOs + * @hsotg: The device instance. + */ +static void dwc2_hsotg_init_fifo(struct dwc2_hsotg *hsotg) +{ + unsigned int ep; + unsigned int addr; + int timeout; + + u32 val; + u32 *txfsz = hsotg->params.g_tx_fifo_size; + + /* Reset fifo map if not correctly cleared during previous session */ + WARN_ON(hsotg->fifo_map); + hsotg->fifo_map = 0; + + /* set RX/NPTX FIFO sizes */ + dwc2_writel(hsotg, hsotg->params.g_rx_fifo_size, GRXFSIZ); + dwc2_writel(hsotg, (hsotg->params.g_rx_fifo_size << + FIFOSIZE_STARTADDR_SHIFT) | + (hsotg->params.g_np_tx_fifo_size << FIFOSIZE_DEPTH_SHIFT), + GNPTXFSIZ); + + /* + * arange all the rest of the TX FIFOs, as some versions of this + * block have overlapping default addresses. This also ensures + * that if the settings have been changed, then they are set to + * known values. + */ + + /* start at the end of the GNPTXFSIZ, rounded up */ + addr = hsotg->params.g_rx_fifo_size + hsotg->params.g_np_tx_fifo_size; + + /* + * Configure fifos sizes from provided configuration and assign + * them to endpoints dynamically according to maxpacket size value of + * given endpoint. + */ + for (ep = 1; ep < MAX_EPS_CHANNELS; ep++) { + if (!txfsz[ep]) + continue; + val = addr; + val |= txfsz[ep] << FIFOSIZE_DEPTH_SHIFT; + WARN_ONCE(addr + txfsz[ep] > hsotg->fifo_mem, + "insufficient fifo memory"); + addr += txfsz[ep]; + + dwc2_writel(hsotg, val, DPTXFSIZN(ep)); + val = dwc2_readl(hsotg, DPTXFSIZN(ep)); + } + + dwc2_writel(hsotg, hsotg->hw_params.total_fifo_size | + addr << GDFIFOCFG_EPINFOBASE_SHIFT, + GDFIFOCFG); + /* + * according to p428 of the design guide, we need to ensure that + * all fifos are flushed before continuing + */ + + dwc2_writel(hsotg, GRSTCTL_TXFNUM(0x10) | GRSTCTL_TXFFLSH | + GRSTCTL_RXFFLSH, GRSTCTL); + + /* wait until the fifos are both flushed */ + timeout = 100; + while (1) { + val = dwc2_readl(hsotg, GRSTCTL); + + if ((val & (GRSTCTL_TXFFLSH | GRSTCTL_RXFFLSH)) == 0) + break; + + if (--timeout == 0) { + dev_err(hsotg->dev, + "%s: timeout flushing fifos (GRSTCTL=%08x)\n", + __func__, val); + break; + } + + udelay(1); + } + + dev_dbg(hsotg->dev, "FIFOs reset, timeout at %d\n", timeout); +} + +/** + * dwc2_hsotg_ep_alloc_request - allocate USB rerequest structure + * @ep: USB endpoint to allocate request for. + * @flags: Allocation flags + * + * Allocate a new USB request structure appropriate for the specified endpoint + */ +static struct usb_request *dwc2_hsotg_ep_alloc_request(struct usb_ep *ep, + gfp_t flags) +{ + struct dwc2_hsotg_req *req; + + req = kzalloc(sizeof(*req), flags); + if (!req) + return NULL; + + INIT_LIST_HEAD(&req->queue); + + return &req->req; +} + +/** + * is_ep_periodic - return true if the endpoint is in periodic mode. + * @hs_ep: The endpoint to query. + * + * Returns true if the endpoint is in periodic mode, meaning it is being + * used for an Interrupt or ISO transfer. + */ +static inline int is_ep_periodic(struct dwc2_hsotg_ep *hs_ep) +{ + return hs_ep->periodic; +} + +/** + * dwc2_hsotg_unmap_dma - unmap the DMA memory being used for the request + * @hsotg: The device state. + * @hs_ep: The endpoint for the request + * @hs_req: The request being processed. + * + * This is the reverse of dwc2_hsotg_map_dma(), called for the completion + * of a request to ensure the buffer is ready for access by the caller. + */ +static void dwc2_hsotg_unmap_dma(struct dwc2_hsotg *hsotg, + struct dwc2_hsotg_ep *hs_ep, + struct dwc2_hsotg_req *hs_req) +{ + struct usb_request *req = &hs_req->req; + + usb_gadget_unmap_request(&hsotg->gadget, req, hs_ep->map_dir); +} + +/* + * dwc2_gadget_alloc_ctrl_desc_chains - allocate DMA descriptor chains + * for Control endpoint + * @hsotg: The device state. + * + * This function will allocate 4 descriptor chains for EP 0: 2 for + * Setup stage, per one for IN and OUT data/status transactions. + */ +static int dwc2_gadget_alloc_ctrl_desc_chains(struct dwc2_hsotg *hsotg) +{ + hsotg->setup_desc[0] = + dmam_alloc_coherent(hsotg->dev, + sizeof(struct dwc2_dma_desc), + &hsotg->setup_desc_dma[0], + GFP_KERNEL); + if (!hsotg->setup_desc[0]) + goto fail; + + hsotg->setup_desc[1] = + dmam_alloc_coherent(hsotg->dev, + sizeof(struct dwc2_dma_desc), + &hsotg->setup_desc_dma[1], + GFP_KERNEL); + if (!hsotg->setup_desc[1]) + goto fail; + + hsotg->ctrl_in_desc = + dmam_alloc_coherent(hsotg->dev, + sizeof(struct dwc2_dma_desc), + &hsotg->ctrl_in_desc_dma, + GFP_KERNEL); + if (!hsotg->ctrl_in_desc) + goto fail; + + hsotg->ctrl_out_desc = + dmam_alloc_coherent(hsotg->dev, + sizeof(struct dwc2_dma_desc), + &hsotg->ctrl_out_desc_dma, + GFP_KERNEL); + if (!hsotg->ctrl_out_desc) + goto fail; + + return 0; + +fail: + return -ENOMEM; +} + +/** + * dwc2_hsotg_write_fifo - write packet Data to the TxFIFO + * @hsotg: The controller state. + * @hs_ep: The endpoint we're going to write for. + * @hs_req: The request to write data for. + * + * This is called when the TxFIFO has some space in it to hold a new + * transmission and we have something to give it. The actual setup of + * the data size is done elsewhere, so all we have to do is to actually + * write the data. + * + * The return value is zero if there is more space (or nothing was done) + * otherwise -ENOSPC is returned if the FIFO space was used up. + * + * This routine is only needed for PIO + */ +static int dwc2_hsotg_write_fifo(struct dwc2_hsotg *hsotg, + struct dwc2_hsotg_ep *hs_ep, + struct dwc2_hsotg_req *hs_req) +{ + bool periodic = is_ep_periodic(hs_ep); + u32 gnptxsts = dwc2_readl(hsotg, GNPTXSTS); + int buf_pos = hs_req->req.actual; + int to_write = hs_ep->size_loaded; + void *data; + int can_write; + int pkt_round; + int max_transfer; + + to_write -= (buf_pos - hs_ep->last_load); + + /* if there's nothing to write, get out early */ + if (to_write == 0) + return 0; + + if (periodic && !hsotg->dedicated_fifos) { + u32 epsize = dwc2_readl(hsotg, DIEPTSIZ(hs_ep->index)); + int size_left; + int size_done; + + /* + * work out how much data was loaded so we can calculate + * how much data is left in the fifo. + */ + + size_left = DXEPTSIZ_XFERSIZE_GET(epsize); + + /* + * if shared fifo, we cannot write anything until the + * previous data has been completely sent. + */ + if (hs_ep->fifo_load != 0) { + dwc2_hsotg_en_gsint(hsotg, GINTSTS_PTXFEMP); + return -ENOSPC; + } + + dev_dbg(hsotg->dev, "%s: left=%d, load=%d, fifo=%d, size %d\n", + __func__, size_left, + hs_ep->size_loaded, hs_ep->fifo_load, hs_ep->fifo_size); + + /* how much of the data has moved */ + size_done = hs_ep->size_loaded - size_left; + + /* how much data is left in the fifo */ + can_write = hs_ep->fifo_load - size_done; + dev_dbg(hsotg->dev, "%s: => can_write1=%d\n", + __func__, can_write); + + can_write = hs_ep->fifo_size - can_write; + dev_dbg(hsotg->dev, "%s: => can_write2=%d\n", + __func__, can_write); + + if (can_write <= 0) { + dwc2_hsotg_en_gsint(hsotg, GINTSTS_PTXFEMP); + return -ENOSPC; + } + } else if (hsotg->dedicated_fifos && hs_ep->index != 0) { + can_write = dwc2_readl(hsotg, + DTXFSTS(hs_ep->fifo_index)); + + can_write &= 0xffff; + can_write *= 4; + } else { + if (GNPTXSTS_NP_TXQ_SPC_AVAIL_GET(gnptxsts) == 0) { + dev_dbg(hsotg->dev, + "%s: no queue slots available (0x%08x)\n", + __func__, gnptxsts); + + dwc2_hsotg_en_gsint(hsotg, GINTSTS_NPTXFEMP); + return -ENOSPC; + } + + can_write = GNPTXSTS_NP_TXF_SPC_AVAIL_GET(gnptxsts); + can_write *= 4; /* fifo size is in 32bit quantities. */ + } + + max_transfer = hs_ep->ep.maxpacket * hs_ep->mc; + + dev_dbg(hsotg->dev, "%s: GNPTXSTS=%08x, can=%d, to=%d, max_transfer %d\n", + __func__, gnptxsts, can_write, to_write, max_transfer); + + /* + * limit to 512 bytes of data, it seems at least on the non-periodic + * FIFO, requests of >512 cause the endpoint to get stuck with a + * fragment of the end of the transfer in it. + */ + if (can_write > 512 && !periodic) + can_write = 512; + + /* + * limit the write to one max-packet size worth of data, but allow + * the transfer to return that it did not run out of fifo space + * doing it. + */ + if (to_write > max_transfer) { + to_write = max_transfer; + + /* it's needed only when we do not use dedicated fifos */ + if (!hsotg->dedicated_fifos) + dwc2_hsotg_en_gsint(hsotg, + periodic ? GINTSTS_PTXFEMP : + GINTSTS_NPTXFEMP); + } + + /* see if we can write data */ + + if (to_write > can_write) { + to_write = can_write; + pkt_round = to_write % max_transfer; + + /* + * Round the write down to an + * exact number of packets. + * + * Note, we do not currently check to see if we can ever + * write a full packet or not to the FIFO. + */ + + if (pkt_round) + to_write -= pkt_round; + + /* + * enable correct FIFO interrupt to alert us when there + * is more room left. + */ + + /* it's needed only when we do not use dedicated fifos */ + if (!hsotg->dedicated_fifos) + dwc2_hsotg_en_gsint(hsotg, + periodic ? GINTSTS_PTXFEMP : + GINTSTS_NPTXFEMP); + } + + dev_dbg(hsotg->dev, "write %d/%d, can_write %d, done %d\n", + to_write, hs_req->req.length, can_write, buf_pos); + + if (to_write <= 0) + return -ENOSPC; + + hs_req->req.actual = buf_pos + to_write; + hs_ep->total_data += to_write; + + if (periodic) + hs_ep->fifo_load += to_write; + + to_write = DIV_ROUND_UP(to_write, 4); + data = hs_req->req.buf + buf_pos; + + dwc2_writel_rep(hsotg, EPFIFO(hs_ep->index), data, to_write); + + return (to_write >= can_write) ? -ENOSPC : 0; +} + +/** + * get_ep_limit - get the maximum data legnth for this endpoint + * @hs_ep: The endpoint + * + * Return the maximum data that can be queued in one go on a given endpoint + * so that transfers that are too long can be split. + */ +static unsigned int get_ep_limit(struct dwc2_hsotg_ep *hs_ep) +{ + int index = hs_ep->index; + unsigned int maxsize; + unsigned int maxpkt; + + if (index != 0) { + maxsize = DXEPTSIZ_XFERSIZE_LIMIT + 1; + maxpkt = DXEPTSIZ_PKTCNT_LIMIT + 1; + } else { + maxsize = 64 + 64; + if (hs_ep->dir_in) + maxpkt = DIEPTSIZ0_PKTCNT_LIMIT + 1; + else + maxpkt = 2; + } + + /* we made the constant loading easier above by using +1 */ + maxpkt--; + maxsize--; + + /* + * constrain by packet count if maxpkts*pktsize is greater + * than the length register size. + */ + + if ((maxpkt * hs_ep->ep.maxpacket) < maxsize) + maxsize = maxpkt * hs_ep->ep.maxpacket; + + return maxsize; +} + +/** + * dwc2_hsotg_read_frameno - read current frame number + * @hsotg: The device instance + * + * Return the current frame number + */ +static u32 dwc2_hsotg_read_frameno(struct dwc2_hsotg *hsotg) +{ + u32 dsts; + + dsts = dwc2_readl(hsotg, DSTS); + dsts &= DSTS_SOFFN_MASK; + dsts >>= DSTS_SOFFN_SHIFT; + + return dsts; +} + +/** + * dwc2_gadget_get_chain_limit - get the maximum data payload value of the + * DMA descriptor chain prepared for specific endpoint + * @hs_ep: The endpoint + * + * Return the maximum data that can be queued in one go on a given endpoint + * depending on its descriptor chain capacity so that transfers that + * are too long can be split. + */ +static unsigned int dwc2_gadget_get_chain_limit(struct dwc2_hsotg_ep *hs_ep) +{ + const struct usb_endpoint_descriptor *ep_desc = hs_ep->ep.desc; + int is_isoc = hs_ep->isochronous; + unsigned int maxsize; + u32 mps = hs_ep->ep.maxpacket; + int dir_in = hs_ep->dir_in; + + if (is_isoc) + maxsize = (hs_ep->dir_in ? DEV_DMA_ISOC_TX_NBYTES_LIMIT : + DEV_DMA_ISOC_RX_NBYTES_LIMIT) * + MAX_DMA_DESC_NUM_HS_ISOC; + else + maxsize = DEV_DMA_NBYTES_LIMIT * MAX_DMA_DESC_NUM_GENERIC; + + /* Interrupt OUT EP with mps not multiple of 4 */ + if (hs_ep->index) + if (usb_endpoint_xfer_int(ep_desc) && !dir_in && (mps % 4)) + maxsize = mps * MAX_DMA_DESC_NUM_GENERIC; + + return maxsize; +} + +/* + * dwc2_gadget_get_desc_params - get DMA descriptor parameters. + * @hs_ep: The endpoint + * @mask: RX/TX bytes mask to be defined + * + * Returns maximum data payload for one descriptor after analyzing endpoint + * characteristics. + * DMA descriptor transfer bytes limit depends on EP type: + * Control out - MPS, + * Isochronous - descriptor rx/tx bytes bitfield limit, + * Control In/Bulk/Interrupt - multiple of mps. This will allow to not + * have concatenations from various descriptors within one packet. + * Interrupt OUT - if mps not multiple of 4 then a single packet corresponds + * to a single descriptor. + * + * Selects corresponding mask for RX/TX bytes as well. + */ +static u32 dwc2_gadget_get_desc_params(struct dwc2_hsotg_ep *hs_ep, u32 *mask) +{ + const struct usb_endpoint_descriptor *ep_desc = hs_ep->ep.desc; + u32 mps = hs_ep->ep.maxpacket; + int dir_in = hs_ep->dir_in; + u32 desc_size = 0; + + if (!hs_ep->index && !dir_in) { + desc_size = mps; + *mask = DEV_DMA_NBYTES_MASK; + } else if (hs_ep->isochronous) { + if (dir_in) { + desc_size = DEV_DMA_ISOC_TX_NBYTES_LIMIT; + *mask = DEV_DMA_ISOC_TX_NBYTES_MASK; + } else { + desc_size = DEV_DMA_ISOC_RX_NBYTES_LIMIT; + *mask = DEV_DMA_ISOC_RX_NBYTES_MASK; + } + } else { + desc_size = DEV_DMA_NBYTES_LIMIT; + *mask = DEV_DMA_NBYTES_MASK; + + /* Round down desc_size to be mps multiple */ + desc_size -= desc_size % mps; + } + + /* Interrupt OUT EP with mps not multiple of 4 */ + if (hs_ep->index) + if (usb_endpoint_xfer_int(ep_desc) && !dir_in && (mps % 4)) { + desc_size = mps; + *mask = DEV_DMA_NBYTES_MASK; + } + + return desc_size; +} + +static void dwc2_gadget_fill_nonisoc_xfer_ddma_one(struct dwc2_hsotg_ep *hs_ep, + struct dwc2_dma_desc **desc, + dma_addr_t dma_buff, + unsigned int len, + bool true_last) +{ + int dir_in = hs_ep->dir_in; + u32 mps = hs_ep->ep.maxpacket; + u32 maxsize = 0; + u32 offset = 0; + u32 mask = 0; + int i; + + maxsize = dwc2_gadget_get_desc_params(hs_ep, &mask); + + hs_ep->desc_count = (len / maxsize) + + ((len % maxsize) ? 1 : 0); + if (len == 0) + hs_ep->desc_count = 1; + + for (i = 0; i < hs_ep->desc_count; ++i) { + (*desc)->status = 0; + (*desc)->status |= (DEV_DMA_BUFF_STS_HBUSY + << DEV_DMA_BUFF_STS_SHIFT); + + if (len > maxsize) { + if (!hs_ep->index && !dir_in) + (*desc)->status |= (DEV_DMA_L | DEV_DMA_IOC); + + (*desc)->status |= + maxsize << DEV_DMA_NBYTES_SHIFT & mask; + (*desc)->buf = dma_buff + offset; + + len -= maxsize; + offset += maxsize; + } else { + if (true_last) + (*desc)->status |= (DEV_DMA_L | DEV_DMA_IOC); + + if (dir_in) + (*desc)->status |= (len % mps) ? DEV_DMA_SHORT : + ((hs_ep->send_zlp && true_last) ? + DEV_DMA_SHORT : 0); + + (*desc)->status |= + len << DEV_DMA_NBYTES_SHIFT & mask; + (*desc)->buf = dma_buff + offset; + } + + (*desc)->status &= ~DEV_DMA_BUFF_STS_MASK; + (*desc)->status |= (DEV_DMA_BUFF_STS_HREADY + << DEV_DMA_BUFF_STS_SHIFT); + (*desc)++; + } +} + +/* + * dwc2_gadget_config_nonisoc_xfer_ddma - prepare non ISOC DMA desc chain. + * @hs_ep: The endpoint + * @ureq: Request to transfer + * @offset: offset in bytes + * @len: Length of the transfer + * + * This function will iterate over descriptor chain and fill its entries + * with corresponding information based on transfer data. + */ +static void dwc2_gadget_config_nonisoc_xfer_ddma(struct dwc2_hsotg_ep *hs_ep, + dma_addr_t dma_buff, + unsigned int len) +{ + struct usb_request *ureq = NULL; + struct dwc2_dma_desc *desc = hs_ep->desc_list; + struct scatterlist *sg; + int i; + u8 desc_count = 0; + + if (hs_ep->req) + ureq = &hs_ep->req->req; + + /* non-DMA sg buffer */ + if (!ureq || !ureq->num_sgs) { + dwc2_gadget_fill_nonisoc_xfer_ddma_one(hs_ep, &desc, + dma_buff, len, true); + return; + } + + /* DMA sg buffer */ + for_each_sg(ureq->sg, sg, ureq->num_sgs, i) { + dwc2_gadget_fill_nonisoc_xfer_ddma_one(hs_ep, &desc, + sg_dma_address(sg) + sg->offset, sg_dma_len(sg), + sg_is_last(sg)); + desc_count += hs_ep->desc_count; + } + + hs_ep->desc_count = desc_count; +} + +/* + * dwc2_gadget_fill_isoc_desc - fills next isochronous descriptor in chain. + * @hs_ep: The isochronous endpoint. + * @dma_buff: usb requests dma buffer. + * @len: usb request transfer length. + * + * Fills next free descriptor with the data of the arrived usb request, + * frame info, sets Last and IOC bits increments next_desc. If filled + * descriptor is not the first one, removes L bit from the previous descriptor + * status. + */ +static int dwc2_gadget_fill_isoc_desc(struct dwc2_hsotg_ep *hs_ep, + dma_addr_t dma_buff, unsigned int len) +{ + struct dwc2_dma_desc *desc; + struct dwc2_hsotg *hsotg = hs_ep->parent; + u32 index; + u32 mask = 0; + u8 pid = 0; + + dwc2_gadget_get_desc_params(hs_ep, &mask); + + index = hs_ep->next_desc; + desc = &hs_ep->desc_list[index]; + + /* Check if descriptor chain full */ + if ((desc->status >> DEV_DMA_BUFF_STS_SHIFT) == + DEV_DMA_BUFF_STS_HREADY) { + dev_dbg(hsotg->dev, "%s: desc chain full\n", __func__); + return 1; + } + + /* Clear L bit of previous desc if more than one entries in the chain */ + if (hs_ep->next_desc) + hs_ep->desc_list[index - 1].status &= ~DEV_DMA_L; + + dev_dbg(hsotg->dev, "%s: Filling ep %d, dir %s isoc desc # %d\n", + __func__, hs_ep->index, hs_ep->dir_in ? "in" : "out", index); + + desc->status = 0; + desc->status |= (DEV_DMA_BUFF_STS_HBUSY << DEV_DMA_BUFF_STS_SHIFT); + + desc->buf = dma_buff; + desc->status |= (DEV_DMA_L | DEV_DMA_IOC | + ((len << DEV_DMA_NBYTES_SHIFT) & mask)); + + if (hs_ep->dir_in) { + if (len) + pid = DIV_ROUND_UP(len, hs_ep->ep.maxpacket); + else + pid = 1; + desc->status |= ((pid << DEV_DMA_ISOC_PID_SHIFT) & + DEV_DMA_ISOC_PID_MASK) | + ((len % hs_ep->ep.maxpacket) ? + DEV_DMA_SHORT : 0) | + ((hs_ep->target_frame << + DEV_DMA_ISOC_FRNUM_SHIFT) & + DEV_DMA_ISOC_FRNUM_MASK); + } + + desc->status &= ~DEV_DMA_BUFF_STS_MASK; + desc->status |= (DEV_DMA_BUFF_STS_HREADY << DEV_DMA_BUFF_STS_SHIFT); + + /* Increment frame number by interval for IN */ + if (hs_ep->dir_in) + dwc2_gadget_incr_frame_num(hs_ep); + + /* Update index of last configured entry in the chain */ + hs_ep->next_desc++; + if (hs_ep->next_desc >= MAX_DMA_DESC_NUM_HS_ISOC) + hs_ep->next_desc = 0; + + return 0; +} + +/* + * dwc2_gadget_start_isoc_ddma - start isochronous transfer in DDMA + * @hs_ep: The isochronous endpoint. + * + * Prepare descriptor chain for isochronous endpoints. Afterwards + * write DMA address to HW and enable the endpoint. + */ +static void dwc2_gadget_start_isoc_ddma(struct dwc2_hsotg_ep *hs_ep) +{ + struct dwc2_hsotg *hsotg = hs_ep->parent; + struct dwc2_hsotg_req *hs_req, *treq; + int index = hs_ep->index; + int ret; + int i; + u32 dma_reg; + u32 depctl; + u32 ctrl; + struct dwc2_dma_desc *desc; + + if (list_empty(&hs_ep->queue)) { + hs_ep->target_frame = TARGET_FRAME_INITIAL; + dev_dbg(hsotg->dev, "%s: No requests in queue\n", __func__); + return; + } + + /* Initialize descriptor chain by Host Busy status */ + for (i = 0; i < MAX_DMA_DESC_NUM_HS_ISOC; i++) { + desc = &hs_ep->desc_list[i]; + desc->status = 0; + desc->status |= (DEV_DMA_BUFF_STS_HBUSY + << DEV_DMA_BUFF_STS_SHIFT); + } + + hs_ep->next_desc = 0; + list_for_each_entry_safe(hs_req, treq, &hs_ep->queue, queue) { + dma_addr_t dma_addr = hs_req->req.dma; + + if (hs_req->req.num_sgs) { + WARN_ON(hs_req->req.num_sgs > 1); + dma_addr = sg_dma_address(hs_req->req.sg); + } + ret = dwc2_gadget_fill_isoc_desc(hs_ep, dma_addr, + hs_req->req.length); + if (ret) + break; + } + + hs_ep->compl_desc = 0; + depctl = hs_ep->dir_in ? DIEPCTL(index) : DOEPCTL(index); + dma_reg = hs_ep->dir_in ? DIEPDMA(index) : DOEPDMA(index); + + /* write descriptor chain address to control register */ + dwc2_writel(hsotg, hs_ep->desc_list_dma, dma_reg); + + ctrl = dwc2_readl(hsotg, depctl); + ctrl |= DXEPCTL_EPENA | DXEPCTL_CNAK; + dwc2_writel(hsotg, ctrl, depctl); +} + +static bool dwc2_gadget_target_frame_elapsed(struct dwc2_hsotg_ep *hs_ep); +static void dwc2_hsotg_complete_request(struct dwc2_hsotg *hsotg, + struct dwc2_hsotg_ep *hs_ep, + struct dwc2_hsotg_req *hs_req, + int result); + +/** + * dwc2_hsotg_start_req - start a USB request from an endpoint's queue + * @hsotg: The controller state. + * @hs_ep: The endpoint to process a request for + * @hs_req: The request to start. + * @continuing: True if we are doing more for the current request. + * + * Start the given request running by setting the endpoint registers + * appropriately, and writing any data to the FIFOs. + */ +static void dwc2_hsotg_start_req(struct dwc2_hsotg *hsotg, + struct dwc2_hsotg_ep *hs_ep, + struct dwc2_hsotg_req *hs_req, + bool continuing) +{ + struct usb_request *ureq = &hs_req->req; + int index = hs_ep->index; + int dir_in = hs_ep->dir_in; + u32 epctrl_reg; + u32 epsize_reg; + u32 epsize; + u32 ctrl; + unsigned int length; + unsigned int packets; + unsigned int maxreq; + unsigned int dma_reg; + + if (index != 0) { + if (hs_ep->req && !continuing) { + dev_err(hsotg->dev, "%s: active request\n", __func__); + WARN_ON(1); + return; + } else if (hs_ep->req != hs_req && continuing) { + dev_err(hsotg->dev, + "%s: continue different req\n", __func__); + WARN_ON(1); + return; + } + } + + dma_reg = dir_in ? DIEPDMA(index) : DOEPDMA(index); + epctrl_reg = dir_in ? DIEPCTL(index) : DOEPCTL(index); + epsize_reg = dir_in ? DIEPTSIZ(index) : DOEPTSIZ(index); + + dev_dbg(hsotg->dev, "%s: DxEPCTL=0x%08x, ep %d, dir %s\n", + __func__, dwc2_readl(hsotg, epctrl_reg), index, + hs_ep->dir_in ? "in" : "out"); + + /* If endpoint is stalled, we will restart request later */ + ctrl = dwc2_readl(hsotg, epctrl_reg); + + if (index && ctrl & DXEPCTL_STALL) { + dev_warn(hsotg->dev, "%s: ep%d is stalled\n", __func__, index); + return; + } + + length = ureq->length - ureq->actual; + dev_dbg(hsotg->dev, "ureq->length:%d ureq->actual:%d\n", + ureq->length, ureq->actual); + + if (!using_desc_dma(hsotg)) + maxreq = get_ep_limit(hs_ep); + else + maxreq = dwc2_gadget_get_chain_limit(hs_ep); + + if (length > maxreq) { + int round = maxreq % hs_ep->ep.maxpacket; + + dev_dbg(hsotg->dev, "%s: length %d, max-req %d, r %d\n", + __func__, length, maxreq, round); + + /* round down to multiple of packets */ + if (round) + maxreq -= round; + + length = maxreq; + } + + if (length) + packets = DIV_ROUND_UP(length, hs_ep->ep.maxpacket); + else + packets = 1; /* send one packet if length is zero. */ + + if (dir_in && index != 0) + if (hs_ep->isochronous) + epsize = DXEPTSIZ_MC(packets); + else + epsize = DXEPTSIZ_MC(1); + else + epsize = 0; + + /* + * zero length packet should be programmed on its own and should not + * be counted in DIEPTSIZ.PktCnt with other packets. + */ + if (dir_in && ureq->zero && !continuing) { + /* Test if zlp is actually required. */ + if ((ureq->length >= hs_ep->ep.maxpacket) && + !(ureq->length % hs_ep->ep.maxpacket)) + hs_ep->send_zlp = 1; + } + + epsize |= DXEPTSIZ_PKTCNT(packets); + epsize |= DXEPTSIZ_XFERSIZE(length); + + dev_dbg(hsotg->dev, "%s: %d@%d/%d, 0x%08x => 0x%08x\n", + __func__, packets, length, ureq->length, epsize, epsize_reg); + + /* store the request as the current one we're doing */ + hs_ep->req = hs_req; + + if (using_desc_dma(hsotg)) { + u32 offset = 0; + u32 mps = hs_ep->ep.maxpacket; + + /* Adjust length: EP0 - MPS, other OUT EPs - multiple of MPS */ + if (!dir_in) { + if (!index) + length = mps; + else if (length % mps) + length += (mps - (length % mps)); + } + + if (continuing) + offset = ureq->actual; + + /* Fill DDMA chain entries */ + dwc2_gadget_config_nonisoc_xfer_ddma(hs_ep, ureq->dma + offset, + length); + + /* write descriptor chain address to control register */ + dwc2_writel(hsotg, hs_ep->desc_list_dma, dma_reg); + + dev_dbg(hsotg->dev, "%s: %08x pad => 0x%08x\n", + __func__, (u32)hs_ep->desc_list_dma, dma_reg); + } else { + /* write size / packets */ + dwc2_writel(hsotg, epsize, epsize_reg); + + if (using_dma(hsotg) && !continuing && (length != 0)) { + /* + * write DMA address to control register, buffer + * already synced by dwc2_hsotg_ep_queue(). + */ + + dwc2_writel(hsotg, ureq->dma, dma_reg); + + dev_dbg(hsotg->dev, "%s: %pad => 0x%08x\n", + __func__, &ureq->dma, dma_reg); + } + } + + if (hs_ep->isochronous) { + if (!dwc2_gadget_target_frame_elapsed(hs_ep)) { + if (hs_ep->interval == 1) { + if (hs_ep->target_frame & 0x1) + ctrl |= DXEPCTL_SETODDFR; + else + ctrl |= DXEPCTL_SETEVENFR; + } + ctrl |= DXEPCTL_CNAK; + } else { + hs_req->req.frame_number = hs_ep->target_frame; + hs_req->req.actual = 0; + dwc2_hsotg_complete_request(hsotg, hs_ep, hs_req, -ENODATA); + return; + } + } + + ctrl |= DXEPCTL_EPENA; /* ensure ep enabled */ + + dev_dbg(hsotg->dev, "ep0 state:%d\n", hsotg->ep0_state); + + /* For Setup request do not clear NAK */ + if (!(index == 0 && hsotg->ep0_state == DWC2_EP0_SETUP)) + ctrl |= DXEPCTL_CNAK; /* clear NAK set by core */ + + dev_dbg(hsotg->dev, "%s: DxEPCTL=0x%08x\n", __func__, ctrl); + dwc2_writel(hsotg, ctrl, epctrl_reg); + + /* + * set these, it seems that DMA support increments past the end + * of the packet buffer so we need to calculate the length from + * this information. + */ + hs_ep->size_loaded = length; + hs_ep->last_load = ureq->actual; + + if (dir_in && !using_dma(hsotg)) { + /* set these anyway, we may need them for non-periodic in */ + hs_ep->fifo_load = 0; + + dwc2_hsotg_write_fifo(hsotg, hs_ep, hs_req); + } + + /* + * Note, trying to clear the NAK here causes problems with transmit + * on the S3C6400 ending up with the TXFIFO becoming full. + */ + + /* check ep is enabled */ + if (!(dwc2_readl(hsotg, epctrl_reg) & DXEPCTL_EPENA)) + dev_dbg(hsotg->dev, + "ep%d: failed to become enabled (DXEPCTL=0x%08x)?\n", + index, dwc2_readl(hsotg, epctrl_reg)); + + dev_dbg(hsotg->dev, "%s: DXEPCTL=0x%08x\n", + __func__, dwc2_readl(hsotg, epctrl_reg)); + + /* enable ep interrupts */ + dwc2_hsotg_ctrl_epint(hsotg, hs_ep->index, hs_ep->dir_in, 1); +} + +/** + * dwc2_hsotg_map_dma - map the DMA memory being used for the request + * @hsotg: The device state. + * @hs_ep: The endpoint the request is on. + * @req: The request being processed. + * + * We've been asked to queue a request, so ensure that the memory buffer + * is correctly setup for DMA. If we've been passed an extant DMA address + * then ensure the buffer has been synced to memory. If our buffer has no + * DMA memory, then we map the memory and mark our request to allow us to + * cleanup on completion. + */ +static int dwc2_hsotg_map_dma(struct dwc2_hsotg *hsotg, + struct dwc2_hsotg_ep *hs_ep, + struct usb_request *req) +{ + int ret; + + hs_ep->map_dir = hs_ep->dir_in; + ret = usb_gadget_map_request(&hsotg->gadget, req, hs_ep->dir_in); + if (ret) + goto dma_error; + + return 0; + +dma_error: + dev_err(hsotg->dev, "%s: failed to map buffer %p, %d bytes\n", + __func__, req->buf, req->length); + + return -EIO; +} + +static int dwc2_hsotg_handle_unaligned_buf_start(struct dwc2_hsotg *hsotg, + struct dwc2_hsotg_ep *hs_ep, + struct dwc2_hsotg_req *hs_req) +{ + void *req_buf = hs_req->req.buf; + + /* If dma is not being used or buffer is aligned */ + if (!using_dma(hsotg) || !((long)req_buf & 3)) + return 0; + + WARN_ON(hs_req->saved_req_buf); + + dev_dbg(hsotg->dev, "%s: %s: buf=%p length=%d\n", __func__, + hs_ep->ep.name, req_buf, hs_req->req.length); + + hs_req->req.buf = kmalloc(hs_req->req.length, GFP_ATOMIC); + if (!hs_req->req.buf) { + hs_req->req.buf = req_buf; + dev_err(hsotg->dev, + "%s: unable to allocate memory for bounce buffer\n", + __func__); + return -ENOMEM; + } + + /* Save actual buffer */ + hs_req->saved_req_buf = req_buf; + + if (hs_ep->dir_in) + memcpy(hs_req->req.buf, req_buf, hs_req->req.length); + return 0; +} + +static void +dwc2_hsotg_handle_unaligned_buf_complete(struct dwc2_hsotg *hsotg, + struct dwc2_hsotg_ep *hs_ep, + struct dwc2_hsotg_req *hs_req) +{ + /* If dma is not being used or buffer was aligned */ + if (!using_dma(hsotg) || !hs_req->saved_req_buf) + return; + + dev_dbg(hsotg->dev, "%s: %s: status=%d actual-length=%d\n", __func__, + hs_ep->ep.name, hs_req->req.status, hs_req->req.actual); + + /* Copy data from bounce buffer on successful out transfer */ + if (!hs_ep->dir_in && !hs_req->req.status) + memcpy(hs_req->saved_req_buf, hs_req->req.buf, + hs_req->req.actual); + + /* Free bounce buffer */ + kfree(hs_req->req.buf); + + hs_req->req.buf = hs_req->saved_req_buf; + hs_req->saved_req_buf = NULL; +} + +/** + * dwc2_gadget_target_frame_elapsed - Checks target frame + * @hs_ep: The driver endpoint to check + * + * Returns 1 if targeted frame elapsed. If returned 1 then we need to drop + * corresponding transfer. + */ +static bool dwc2_gadget_target_frame_elapsed(struct dwc2_hsotg_ep *hs_ep) +{ + struct dwc2_hsotg *hsotg = hs_ep->parent; + u32 target_frame = hs_ep->target_frame; + u32 current_frame = hsotg->frame_number; + bool frame_overrun = hs_ep->frame_overrun; + u16 limit = DSTS_SOFFN_LIMIT; + + if (hsotg->gadget.speed != USB_SPEED_HIGH) + limit >>= 3; + + if (!frame_overrun && current_frame >= target_frame) + return true; + + if (frame_overrun && current_frame >= target_frame && + ((current_frame - target_frame) < limit / 2)) + return true; + + return false; +} + +/* + * dwc2_gadget_set_ep0_desc_chain - Set EP's desc chain pointers + * @hsotg: The driver state + * @hs_ep: the ep descriptor chain is for + * + * Called to update EP0 structure's pointers depend on stage of + * control transfer. + */ +static int dwc2_gadget_set_ep0_desc_chain(struct dwc2_hsotg *hsotg, + struct dwc2_hsotg_ep *hs_ep) +{ + switch (hsotg->ep0_state) { + case DWC2_EP0_SETUP: + case DWC2_EP0_STATUS_OUT: + hs_ep->desc_list = hsotg->setup_desc[0]; + hs_ep->desc_list_dma = hsotg->setup_desc_dma[0]; + break; + case DWC2_EP0_DATA_IN: + case DWC2_EP0_STATUS_IN: + hs_ep->desc_list = hsotg->ctrl_in_desc; + hs_ep->desc_list_dma = hsotg->ctrl_in_desc_dma; + break; + case DWC2_EP0_DATA_OUT: + hs_ep->desc_list = hsotg->ctrl_out_desc; + hs_ep->desc_list_dma = hsotg->ctrl_out_desc_dma; + break; + default: + dev_err(hsotg->dev, "invalid EP 0 state in queue %d\n", + hsotg->ep0_state); + return -EINVAL; + } + + return 0; +} + +static int dwc2_hsotg_ep_queue(struct usb_ep *ep, struct usb_request *req, + gfp_t gfp_flags) +{ + struct dwc2_hsotg_req *hs_req = our_req(req); + struct dwc2_hsotg_ep *hs_ep = our_ep(ep); + struct dwc2_hsotg *hs = hs_ep->parent; + bool first; + int ret; + u32 maxsize = 0; + u32 mask = 0; + + + dev_dbg(hs->dev, "%s: req %p: %d@%p, noi=%d, zero=%d, snok=%d\n", + ep->name, req, req->length, req->buf, req->no_interrupt, + req->zero, req->short_not_ok); + + /* Prevent new request submission when controller is suspended */ + if (hs->lx_state != DWC2_L0) { + dev_dbg(hs->dev, "%s: submit request only in active state\n", + __func__); + return -EAGAIN; + } + + /* initialise status of the request */ + INIT_LIST_HEAD(&hs_req->queue); + req->actual = 0; + req->status = -EINPROGRESS; + + /* Don't queue ISOC request if length greater than mps*mc */ + if (hs_ep->isochronous && + req->length > (hs_ep->mc * hs_ep->ep.maxpacket)) { + dev_err(hs->dev, "req length > maxpacket*mc\n"); + return -EINVAL; + } + + /* In DDMA mode for ISOC's don't queue request if length greater + * than descriptor limits. + */ + if (using_desc_dma(hs) && hs_ep->isochronous) { + maxsize = dwc2_gadget_get_desc_params(hs_ep, &mask); + if (hs_ep->dir_in && req->length > maxsize) { + dev_err(hs->dev, "wrong length %d (maxsize=%d)\n", + req->length, maxsize); + return -EINVAL; + } + + if (!hs_ep->dir_in && req->length > hs_ep->ep.maxpacket) { + dev_err(hs->dev, "ISOC OUT: wrong length %d (mps=%d)\n", + req->length, hs_ep->ep.maxpacket); + return -EINVAL; + } + } + + ret = dwc2_hsotg_handle_unaligned_buf_start(hs, hs_ep, hs_req); + if (ret) + return ret; + + /* if we're using DMA, sync the buffers as necessary */ + if (using_dma(hs)) { + ret = dwc2_hsotg_map_dma(hs, hs_ep, req); + if (ret) + return ret; + } + /* If using descriptor DMA configure EP0 descriptor chain pointers */ + if (using_desc_dma(hs) && !hs_ep->index) { + ret = dwc2_gadget_set_ep0_desc_chain(hs, hs_ep); + if (ret) + return ret; + } + + first = list_empty(&hs_ep->queue); + list_add_tail(&hs_req->queue, &hs_ep->queue); + + /* + * Handle DDMA isochronous transfers separately - just add new entry + * to the descriptor chain. + * Transfer will be started once SW gets either one of NAK or + * OutTknEpDis interrupts. + */ + if (using_desc_dma(hs) && hs_ep->isochronous) { + if (hs_ep->target_frame != TARGET_FRAME_INITIAL) { + dma_addr_t dma_addr = hs_req->req.dma; + + if (hs_req->req.num_sgs) { + WARN_ON(hs_req->req.num_sgs > 1); + dma_addr = sg_dma_address(hs_req->req.sg); + } + dwc2_gadget_fill_isoc_desc(hs_ep, dma_addr, + hs_req->req.length); + } + return 0; + } + + /* Change EP direction if status phase request is after data out */ + if (!hs_ep->index && !req->length && !hs_ep->dir_in && + hs->ep0_state == DWC2_EP0_DATA_OUT) + hs_ep->dir_in = 1; + + if (first) { + if (!hs_ep->isochronous) { + dwc2_hsotg_start_req(hs, hs_ep, hs_req, false); + return 0; + } + + /* Update current frame number value. */ + hs->frame_number = dwc2_hsotg_read_frameno(hs); + while (dwc2_gadget_target_frame_elapsed(hs_ep)) { + dwc2_gadget_incr_frame_num(hs_ep); + /* Update current frame number value once more as it + * changes here. + */ + hs->frame_number = dwc2_hsotg_read_frameno(hs); + } + + if (hs_ep->target_frame != TARGET_FRAME_INITIAL) + dwc2_hsotg_start_req(hs, hs_ep, hs_req, false); + } + return 0; +} + +static int dwc2_hsotg_ep_queue_lock(struct usb_ep *ep, struct usb_request *req, + gfp_t gfp_flags) +{ + struct dwc2_hsotg_ep *hs_ep = our_ep(ep); + struct dwc2_hsotg *hs = hs_ep->parent; + unsigned long flags; + int ret; + + spin_lock_irqsave(&hs->lock, flags); + ret = dwc2_hsotg_ep_queue(ep, req, gfp_flags); + spin_unlock_irqrestore(&hs->lock, flags); + + return ret; +} + +static void dwc2_hsotg_ep_free_request(struct usb_ep *ep, + struct usb_request *req) +{ + struct dwc2_hsotg_req *hs_req = our_req(req); + + kfree(hs_req); +} + +/** + * dwc2_hsotg_complete_oursetup - setup completion callback + * @ep: The endpoint the request was on. + * @req: The request completed. + * + * Called on completion of any requests the driver itself + * submitted that need cleaning up. + */ +static void dwc2_hsotg_complete_oursetup(struct usb_ep *ep, + struct usb_request *req) +{ + struct dwc2_hsotg_ep *hs_ep = our_ep(ep); + struct dwc2_hsotg *hsotg = hs_ep->parent; + + dev_dbg(hsotg->dev, "%s: ep %p, req %p\n", __func__, ep, req); + + dwc2_hsotg_ep_free_request(ep, req); +} + +/** + * ep_from_windex - convert control wIndex value to endpoint + * @hsotg: The driver state. + * @windex: The control request wIndex field (in host order). + * + * Convert the given wIndex into a pointer to an driver endpoint + * structure, or return NULL if it is not a valid endpoint. + */ +static struct dwc2_hsotg_ep *ep_from_windex(struct dwc2_hsotg *hsotg, + u32 windex) +{ + int dir = (windex & USB_DIR_IN) ? 1 : 0; + int idx = windex & 0x7F; + + if (windex >= 0x100) + return NULL; + + if (idx > hsotg->num_of_eps) + return NULL; + + return index_to_ep(hsotg, idx, dir); +} + +/** + * dwc2_hsotg_set_test_mode - Enable usb Test Modes + * @hsotg: The driver state. + * @testmode: requested usb test mode + * Enable usb Test Mode requested by the Host. + */ +int dwc2_hsotg_set_test_mode(struct dwc2_hsotg *hsotg, int testmode) +{ + int dctl = dwc2_readl(hsotg, DCTL); + + dctl &= ~DCTL_TSTCTL_MASK; + switch (testmode) { + case USB_TEST_J: + case USB_TEST_K: + case USB_TEST_SE0_NAK: + case USB_TEST_PACKET: + case USB_TEST_FORCE_ENABLE: + dctl |= testmode << DCTL_TSTCTL_SHIFT; + break; + default: + return -EINVAL; + } + dwc2_writel(hsotg, dctl, DCTL); + return 0; +} + +/** + * dwc2_hsotg_send_reply - send reply to control request + * @hsotg: The device state + * @ep: Endpoint 0 + * @buff: Buffer for request + * @length: Length of reply. + * + * Create a request and queue it on the given endpoint. This is useful as + * an internal method of sending replies to certain control requests, etc. + */ +static int dwc2_hsotg_send_reply(struct dwc2_hsotg *hsotg, + struct dwc2_hsotg_ep *ep, + void *buff, + int length) +{ + struct usb_request *req; + int ret; + + dev_dbg(hsotg->dev, "%s: buff %p, len %d\n", __func__, buff, length); + + req = dwc2_hsotg_ep_alloc_request(&ep->ep, GFP_ATOMIC); + hsotg->ep0_reply = req; + if (!req) { + dev_warn(hsotg->dev, "%s: cannot alloc req\n", __func__); + return -ENOMEM; + } + + req->buf = hsotg->ep0_buff; + req->length = length; + /* + * zero flag is for sending zlp in DATA IN stage. It has no impact on + * STATUS stage. + */ + req->zero = 0; + req->complete = dwc2_hsotg_complete_oursetup; + + if (length) + memcpy(req->buf, buff, length); + + ret = dwc2_hsotg_ep_queue(&ep->ep, req, GFP_ATOMIC); + if (ret) { + dev_warn(hsotg->dev, "%s: cannot queue req\n", __func__); + return ret; + } + + return 0; +} + +/** + * dwc2_hsotg_process_req_status - process request GET_STATUS + * @hsotg: The device state + * @ctrl: USB control request + */ +static int dwc2_hsotg_process_req_status(struct dwc2_hsotg *hsotg, + struct usb_ctrlrequest *ctrl) +{ + struct dwc2_hsotg_ep *ep0 = hsotg->eps_out[0]; + struct dwc2_hsotg_ep *ep; + __le16 reply; + u16 status; + int ret; + + dev_dbg(hsotg->dev, "%s: USB_REQ_GET_STATUS\n", __func__); + + if (!ep0->dir_in) { + dev_warn(hsotg->dev, "%s: direction out?\n", __func__); + return -EINVAL; + } + + switch (ctrl->bRequestType & USB_RECIP_MASK) { + case USB_RECIP_DEVICE: + status = hsotg->gadget.is_selfpowered << + USB_DEVICE_SELF_POWERED; + status |= hsotg->remote_wakeup_allowed << + USB_DEVICE_REMOTE_WAKEUP; + reply = cpu_to_le16(status); + break; + + case USB_RECIP_INTERFACE: + /* currently, the data result should be zero */ + reply = cpu_to_le16(0); + break; + + case USB_RECIP_ENDPOINT: + ep = ep_from_windex(hsotg, le16_to_cpu(ctrl->wIndex)); + if (!ep) + return -ENOENT; + + reply = cpu_to_le16(ep->halted ? 1 : 0); + break; + + default: + return 0; + } + + if (le16_to_cpu(ctrl->wLength) != 2) + return -EINVAL; + + ret = dwc2_hsotg_send_reply(hsotg, ep0, &reply, 2); + if (ret) { + dev_err(hsotg->dev, "%s: failed to send reply\n", __func__); + return ret; + } + + return 1; +} + +static int dwc2_hsotg_ep_sethalt(struct usb_ep *ep, int value, bool now); + +/** + * get_ep_head - return the first request on the endpoint + * @hs_ep: The controller endpoint to get + * + * Get the first request on the endpoint. + */ +static struct dwc2_hsotg_req *get_ep_head(struct dwc2_hsotg_ep *hs_ep) +{ + return list_first_entry_or_null(&hs_ep->queue, struct dwc2_hsotg_req, + queue); +} + +/** + * dwc2_gadget_start_next_request - Starts next request from ep queue + * @hs_ep: Endpoint structure + * + * If queue is empty and EP is ISOC-OUT - unmasks OUTTKNEPDIS which is masked + * in its handler. Hence we need to unmask it here to be able to do + * resynchronization. + */ +static void dwc2_gadget_start_next_request(struct dwc2_hsotg_ep *hs_ep) +{ + struct dwc2_hsotg *hsotg = hs_ep->parent; + int dir_in = hs_ep->dir_in; + struct dwc2_hsotg_req *hs_req; + + if (!list_empty(&hs_ep->queue)) { + hs_req = get_ep_head(hs_ep); + dwc2_hsotg_start_req(hsotg, hs_ep, hs_req, false); + return; + } + if (!hs_ep->isochronous) + return; + + if (dir_in) { + dev_dbg(hsotg->dev, "%s: No more ISOC-IN requests\n", + __func__); + } else { + dev_dbg(hsotg->dev, "%s: No more ISOC-OUT requests\n", + __func__); + } +} + +/** + * dwc2_hsotg_process_req_feature - process request {SET,CLEAR}_FEATURE + * @hsotg: The device state + * @ctrl: USB control request + */ +static int dwc2_hsotg_process_req_feature(struct dwc2_hsotg *hsotg, + struct usb_ctrlrequest *ctrl) +{ + struct dwc2_hsotg_ep *ep0 = hsotg->eps_out[0]; + struct dwc2_hsotg_req *hs_req; + bool set = (ctrl->bRequest == USB_REQ_SET_FEATURE); + struct dwc2_hsotg_ep *ep; + int ret; + bool halted; + u32 recip; + u32 wValue; + u32 wIndex; + + dev_dbg(hsotg->dev, "%s: %s_FEATURE\n", + __func__, set ? "SET" : "CLEAR"); + + wValue = le16_to_cpu(ctrl->wValue); + wIndex = le16_to_cpu(ctrl->wIndex); + recip = ctrl->bRequestType & USB_RECIP_MASK; + + switch (recip) { + case USB_RECIP_DEVICE: + switch (wValue) { + case USB_DEVICE_REMOTE_WAKEUP: + if (set) + hsotg->remote_wakeup_allowed = 1; + else + hsotg->remote_wakeup_allowed = 0; + break; + + case USB_DEVICE_TEST_MODE: + if ((wIndex & 0xff) != 0) + return -EINVAL; + if (!set) + return -EINVAL; + + hsotg->test_mode = wIndex >> 8; + break; + default: + return -ENOENT; + } + + ret = dwc2_hsotg_send_reply(hsotg, ep0, NULL, 0); + if (ret) { + dev_err(hsotg->dev, + "%s: failed to send reply\n", __func__); + return ret; + } + break; + + case USB_RECIP_ENDPOINT: + ep = ep_from_windex(hsotg, wIndex); + if (!ep) { + dev_dbg(hsotg->dev, "%s: no endpoint for 0x%04x\n", + __func__, wIndex); + return -ENOENT; + } + + switch (wValue) { + case USB_ENDPOINT_HALT: + halted = ep->halted; + + if (!ep->wedged) + dwc2_hsotg_ep_sethalt(&ep->ep, set, true); + + ret = dwc2_hsotg_send_reply(hsotg, ep0, NULL, 0); + if (ret) { + dev_err(hsotg->dev, + "%s: failed to send reply\n", __func__); + return ret; + } + + /* + * we have to complete all requests for ep if it was + * halted, and the halt was cleared by CLEAR_FEATURE + */ + + if (!set && halted) { + /* + * If we have request in progress, + * then complete it + */ + if (ep->req) { + hs_req = ep->req; + ep->req = NULL; + list_del_init(&hs_req->queue); + if (hs_req->req.complete) { + spin_unlock(&hsotg->lock); + usb_gadget_giveback_request( + &ep->ep, &hs_req->req); + spin_lock(&hsotg->lock); + } + } + + /* If we have pending request, then start it */ + if (!ep->req) + dwc2_gadget_start_next_request(ep); + } + + break; + + default: + return -ENOENT; + } + break; + default: + return -ENOENT; + } + return 1; +} + +static void dwc2_hsotg_enqueue_setup(struct dwc2_hsotg *hsotg); + +/** + * dwc2_hsotg_stall_ep0 - stall ep0 + * @hsotg: The device state + * + * Set stall for ep0 as response for setup request. + */ +static void dwc2_hsotg_stall_ep0(struct dwc2_hsotg *hsotg) +{ + struct dwc2_hsotg_ep *ep0 = hsotg->eps_out[0]; + u32 reg; + u32 ctrl; + + dev_dbg(hsotg->dev, "ep0 stall (dir=%d)\n", ep0->dir_in); + reg = (ep0->dir_in) ? DIEPCTL0 : DOEPCTL0; + + /* + * DxEPCTL_Stall will be cleared by EP once it has + * taken effect, so no need to clear later. + */ + + ctrl = dwc2_readl(hsotg, reg); + ctrl |= DXEPCTL_STALL; + ctrl |= DXEPCTL_CNAK; + dwc2_writel(hsotg, ctrl, reg); + + dev_dbg(hsotg->dev, + "written DXEPCTL=0x%08x to %08x (DXEPCTL=0x%08x)\n", + ctrl, reg, dwc2_readl(hsotg, reg)); + + /* + * complete won't be called, so we enqueue + * setup request here + */ + dwc2_hsotg_enqueue_setup(hsotg); +} + +/** + * dwc2_hsotg_process_control - process a control request + * @hsotg: The device state + * @ctrl: The control request received + * + * The controller has received the SETUP phase of a control request, and + * needs to work out what to do next (and whether to pass it on to the + * gadget driver). + */ +static void dwc2_hsotg_process_control(struct dwc2_hsotg *hsotg, + struct usb_ctrlrequest *ctrl) +{ + struct dwc2_hsotg_ep *ep0 = hsotg->eps_out[0]; + int ret = 0; + u32 dcfg; + + dev_dbg(hsotg->dev, + "ctrl Type=%02x, Req=%02x, V=%04x, I=%04x, L=%04x\n", + ctrl->bRequestType, ctrl->bRequest, ctrl->wValue, + ctrl->wIndex, ctrl->wLength); + + if (ctrl->wLength == 0) { + ep0->dir_in = 1; + hsotg->ep0_state = DWC2_EP0_STATUS_IN; + } else if (ctrl->bRequestType & USB_DIR_IN) { + ep0->dir_in = 1; + hsotg->ep0_state = DWC2_EP0_DATA_IN; + } else { + ep0->dir_in = 0; + hsotg->ep0_state = DWC2_EP0_DATA_OUT; + } + + if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) { + switch (ctrl->bRequest) { + case USB_REQ_SET_ADDRESS: + hsotg->connected = 1; + dcfg = dwc2_readl(hsotg, DCFG); + dcfg &= ~DCFG_DEVADDR_MASK; + dcfg |= (le16_to_cpu(ctrl->wValue) << + DCFG_DEVADDR_SHIFT) & DCFG_DEVADDR_MASK; + dwc2_writel(hsotg, dcfg, DCFG); + + dev_info(hsotg->dev, "new address %d\n", ctrl->wValue); + + ret = dwc2_hsotg_send_reply(hsotg, ep0, NULL, 0); + return; + + case USB_REQ_GET_STATUS: + ret = dwc2_hsotg_process_req_status(hsotg, ctrl); + break; + + case USB_REQ_CLEAR_FEATURE: + case USB_REQ_SET_FEATURE: + ret = dwc2_hsotg_process_req_feature(hsotg, ctrl); + break; + } + } + + /* as a fallback, try delivering it to the driver to deal with */ + + if (ret == 0 && hsotg->driver) { + spin_unlock(&hsotg->lock); + ret = hsotg->driver->setup(&hsotg->gadget, ctrl); + spin_lock(&hsotg->lock); + if (ret < 0) + dev_dbg(hsotg->dev, "driver->setup() ret %d\n", ret); + } + + hsotg->delayed_status = false; + if (ret == USB_GADGET_DELAYED_STATUS) + hsotg->delayed_status = true; + + /* + * the request is either unhandlable, or is not formatted correctly + * so respond with a STALL for the status stage to indicate failure. + */ + + if (ret < 0) + dwc2_hsotg_stall_ep0(hsotg); +} + +/** + * dwc2_hsotg_complete_setup - completion of a setup transfer + * @ep: The endpoint the request was on. + * @req: The request completed. + * + * Called on completion of any requests the driver itself submitted for + * EP0 setup packets + */ +static void dwc2_hsotg_complete_setup(struct usb_ep *ep, + struct usb_request *req) +{ + struct dwc2_hsotg_ep *hs_ep = our_ep(ep); + struct dwc2_hsotg *hsotg = hs_ep->parent; + + if (req->status < 0) { + dev_dbg(hsotg->dev, "%s: failed %d\n", __func__, req->status); + return; + } + + spin_lock(&hsotg->lock); + if (req->actual == 0) + dwc2_hsotg_enqueue_setup(hsotg); + else + dwc2_hsotg_process_control(hsotg, req->buf); + spin_unlock(&hsotg->lock); +} + +/** + * dwc2_hsotg_enqueue_setup - start a request for EP0 packets + * @hsotg: The device state. + * + * Enqueue a request on EP0 if necessary to received any SETUP packets + * received from the host. + */ +static void dwc2_hsotg_enqueue_setup(struct dwc2_hsotg *hsotg) +{ + struct usb_request *req = hsotg->ctrl_req; + struct dwc2_hsotg_req *hs_req = our_req(req); + int ret; + + dev_dbg(hsotg->dev, "%s: queueing setup request\n", __func__); + + req->zero = 0; + req->length = 8; + req->buf = hsotg->ctrl_buff; + req->complete = dwc2_hsotg_complete_setup; + + if (!list_empty(&hs_req->queue)) { + dev_dbg(hsotg->dev, "%s already queued???\n", __func__); + return; + } + + hsotg->eps_out[0]->dir_in = 0; + hsotg->eps_out[0]->send_zlp = 0; + hsotg->ep0_state = DWC2_EP0_SETUP; + + ret = dwc2_hsotg_ep_queue(&hsotg->eps_out[0]->ep, req, GFP_ATOMIC); + if (ret < 0) { + dev_err(hsotg->dev, "%s: failed queue (%d)\n", __func__, ret); + /* + * Don't think there's much we can do other than watch the + * driver fail. + */ + } +} + +static void dwc2_hsotg_program_zlp(struct dwc2_hsotg *hsotg, + struct dwc2_hsotg_ep *hs_ep) +{ + u32 ctrl; + u8 index = hs_ep->index; + u32 epctl_reg = hs_ep->dir_in ? DIEPCTL(index) : DOEPCTL(index); + u32 epsiz_reg = hs_ep->dir_in ? DIEPTSIZ(index) : DOEPTSIZ(index); + + if (hs_ep->dir_in) + dev_dbg(hsotg->dev, "Sending zero-length packet on ep%d\n", + index); + else + dev_dbg(hsotg->dev, "Receiving zero-length packet on ep%d\n", + index); + if (using_desc_dma(hsotg)) { + /* Not specific buffer needed for ep0 ZLP */ + dma_addr_t dma = hs_ep->desc_list_dma; + + if (!index) + dwc2_gadget_set_ep0_desc_chain(hsotg, hs_ep); + + dwc2_gadget_config_nonisoc_xfer_ddma(hs_ep, dma, 0); + } else { + dwc2_writel(hsotg, DXEPTSIZ_MC(1) | DXEPTSIZ_PKTCNT(1) | + DXEPTSIZ_XFERSIZE(0), + epsiz_reg); + } + + ctrl = dwc2_readl(hsotg, epctl_reg); + ctrl |= DXEPCTL_CNAK; /* clear NAK set by core */ + ctrl |= DXEPCTL_EPENA; /* ensure ep enabled */ + ctrl |= DXEPCTL_USBACTEP; + dwc2_writel(hsotg, ctrl, epctl_reg); +} + +/** + * dwc2_hsotg_complete_request - complete a request given to us + * @hsotg: The device state. + * @hs_ep: The endpoint the request was on. + * @hs_req: The request to complete. + * @result: The result code (0 => Ok, otherwise errno) + * + * The given request has finished, so call the necessary completion + * if it has one and then look to see if we can start a new request + * on the endpoint. + * + * Note, expects the ep to already be locked as appropriate. + */ +static void dwc2_hsotg_complete_request(struct dwc2_hsotg *hsotg, + struct dwc2_hsotg_ep *hs_ep, + struct dwc2_hsotg_req *hs_req, + int result) +{ + if (!hs_req) { + dev_dbg(hsotg->dev, "%s: nothing to complete?\n", __func__); + return; + } + + dev_dbg(hsotg->dev, "complete: ep %p %s, req %p, %d => %p\n", + hs_ep, hs_ep->ep.name, hs_req, result, hs_req->req.complete); + + /* + * only replace the status if we've not already set an error + * from a previous transaction + */ + + if (hs_req->req.status == -EINPROGRESS) + hs_req->req.status = result; + + if (using_dma(hsotg)) + dwc2_hsotg_unmap_dma(hsotg, hs_ep, hs_req); + + dwc2_hsotg_handle_unaligned_buf_complete(hsotg, hs_ep, hs_req); + + hs_ep->req = NULL; + list_del_init(&hs_req->queue); + + /* + * call the complete request with the locks off, just in case the + * request tries to queue more work for this endpoint. + */ + + if (hs_req->req.complete) { + spin_unlock(&hsotg->lock); + usb_gadget_giveback_request(&hs_ep->ep, &hs_req->req); + spin_lock(&hsotg->lock); + } + + /* In DDMA don't need to proceed to starting of next ISOC request */ + if (using_desc_dma(hsotg) && hs_ep->isochronous) + return; + + /* + * Look to see if there is anything else to do. Note, the completion + * of the previous request may have caused a new request to be started + * so be careful when doing this. + */ + + if (!hs_ep->req && result >= 0) + dwc2_gadget_start_next_request(hs_ep); +} + +/* + * dwc2_gadget_complete_isoc_request_ddma - complete an isoc request in DDMA + * @hs_ep: The endpoint the request was on. + * + * Get first request from the ep queue, determine descriptor on which complete + * happened. SW discovers which descriptor currently in use by HW, adjusts + * dma_address and calculates index of completed descriptor based on the value + * of DEPDMA register. Update actual length of request, giveback to gadget. + */ +static void dwc2_gadget_complete_isoc_request_ddma(struct dwc2_hsotg_ep *hs_ep) +{ + struct dwc2_hsotg *hsotg = hs_ep->parent; + struct dwc2_hsotg_req *hs_req; + struct usb_request *ureq; + u32 desc_sts; + u32 mask; + + desc_sts = hs_ep->desc_list[hs_ep->compl_desc].status; + + /* Process only descriptors with buffer status set to DMA done */ + while ((desc_sts & DEV_DMA_BUFF_STS_MASK) >> + DEV_DMA_BUFF_STS_SHIFT == DEV_DMA_BUFF_STS_DMADONE) { + + hs_req = get_ep_head(hs_ep); + if (!hs_req) { + dev_warn(hsotg->dev, "%s: ISOC EP queue empty\n", __func__); + return; + } + ureq = &hs_req->req; + + /* Check completion status */ + if ((desc_sts & DEV_DMA_STS_MASK) >> DEV_DMA_STS_SHIFT == + DEV_DMA_STS_SUCC) { + mask = hs_ep->dir_in ? DEV_DMA_ISOC_TX_NBYTES_MASK : + DEV_DMA_ISOC_RX_NBYTES_MASK; + ureq->actual = ureq->length - ((desc_sts & mask) >> + DEV_DMA_ISOC_NBYTES_SHIFT); + + /* Adjust actual len for ISOC Out if len is + * not align of 4 + */ + if (!hs_ep->dir_in && ureq->length & 0x3) + ureq->actual += 4 - (ureq->length & 0x3); + + /* Set actual frame number for completed transfers */ + ureq->frame_number = + (desc_sts & DEV_DMA_ISOC_FRNUM_MASK) >> + DEV_DMA_ISOC_FRNUM_SHIFT; + } + + dwc2_hsotg_complete_request(hsotg, hs_ep, hs_req, 0); + + hs_ep->compl_desc++; + if (hs_ep->compl_desc > (MAX_DMA_DESC_NUM_HS_ISOC - 1)) + hs_ep->compl_desc = 0; + desc_sts = hs_ep->desc_list[hs_ep->compl_desc].status; + } +} + +/* + * dwc2_gadget_handle_isoc_bna - handle BNA interrupt for ISOC. + * @hs_ep: The isochronous endpoint. + * + * If EP ISOC OUT then need to flush RX FIFO to remove source of BNA + * interrupt. Reset target frame and next_desc to allow to start + * ISOC's on NAK interrupt for IN direction or on OUTTKNEPDIS + * interrupt for OUT direction. + */ +static void dwc2_gadget_handle_isoc_bna(struct dwc2_hsotg_ep *hs_ep) +{ + struct dwc2_hsotg *hsotg = hs_ep->parent; + + if (!hs_ep->dir_in) + dwc2_flush_rx_fifo(hsotg); + dwc2_hsotg_complete_request(hsotg, hs_ep, get_ep_head(hs_ep), 0); + + hs_ep->target_frame = TARGET_FRAME_INITIAL; + hs_ep->next_desc = 0; + hs_ep->compl_desc = 0; +} + +/** + * dwc2_hsotg_rx_data - receive data from the FIFO for an endpoint + * @hsotg: The device state. + * @ep_idx: The endpoint index for the data + * @size: The size of data in the fifo, in bytes + * + * The FIFO status shows there is data to read from the FIFO for a given + * endpoint, so sort out whether we need to read the data into a request + * that has been made for that endpoint. + */ +static void dwc2_hsotg_rx_data(struct dwc2_hsotg *hsotg, int ep_idx, int size) +{ + struct dwc2_hsotg_ep *hs_ep = hsotg->eps_out[ep_idx]; + struct dwc2_hsotg_req *hs_req = hs_ep->req; + int to_read; + int max_req; + int read_ptr; + + if (!hs_req) { + u32 epctl = dwc2_readl(hsotg, DOEPCTL(ep_idx)); + int ptr; + + dev_dbg(hsotg->dev, + "%s: FIFO %d bytes on ep%d but no req (DXEPCTl=0x%08x)\n", + __func__, size, ep_idx, epctl); + + /* dump the data from the FIFO, we've nothing we can do */ + for (ptr = 0; ptr < size; ptr += 4) + (void)dwc2_readl(hsotg, EPFIFO(ep_idx)); + + return; + } + + to_read = size; + read_ptr = hs_req->req.actual; + max_req = hs_req->req.length - read_ptr; + + dev_dbg(hsotg->dev, "%s: read %d/%d, done %d/%d\n", + __func__, to_read, max_req, read_ptr, hs_req->req.length); + + if (to_read > max_req) { + /* + * more data appeared than we where willing + * to deal with in this request. + */ + + /* currently we don't deal this */ + WARN_ON_ONCE(1); + } + + hs_ep->total_data += to_read; + hs_req->req.actual += to_read; + to_read = DIV_ROUND_UP(to_read, 4); + + /* + * note, we might over-write the buffer end by 3 bytes depending on + * alignment of the data. + */ + dwc2_readl_rep(hsotg, EPFIFO(ep_idx), + hs_req->req.buf + read_ptr, to_read); +} + +/** + * dwc2_hsotg_ep0_zlp - send/receive zero-length packet on control endpoint + * @hsotg: The device instance + * @dir_in: If IN zlp + * + * Generate a zero-length IN packet request for terminating a SETUP + * transaction. + * + * Note, since we don't write any data to the TxFIFO, then it is + * currently believed that we do not need to wait for any space in + * the TxFIFO. + */ +static void dwc2_hsotg_ep0_zlp(struct dwc2_hsotg *hsotg, bool dir_in) +{ + /* eps_out[0] is used in both directions */ + hsotg->eps_out[0]->dir_in = dir_in; + hsotg->ep0_state = dir_in ? DWC2_EP0_STATUS_IN : DWC2_EP0_STATUS_OUT; + + dwc2_hsotg_program_zlp(hsotg, hsotg->eps_out[0]); +} + +/* + * dwc2_gadget_get_xfersize_ddma - get transferred bytes amount from desc + * @hs_ep - The endpoint on which transfer went + * + * Iterate over endpoints descriptor chain and get info on bytes remained + * in DMA descriptors after transfer has completed. Used for non isoc EPs. + */ +static unsigned int dwc2_gadget_get_xfersize_ddma(struct dwc2_hsotg_ep *hs_ep) +{ + const struct usb_endpoint_descriptor *ep_desc = hs_ep->ep.desc; + struct dwc2_hsotg *hsotg = hs_ep->parent; + unsigned int bytes_rem = 0; + unsigned int bytes_rem_correction = 0; + struct dwc2_dma_desc *desc = hs_ep->desc_list; + int i; + u32 status; + u32 mps = hs_ep->ep.maxpacket; + int dir_in = hs_ep->dir_in; + + if (!desc) + return -EINVAL; + + /* Interrupt OUT EP with mps not multiple of 4 */ + if (hs_ep->index) + if (usb_endpoint_xfer_int(ep_desc) && !dir_in && (mps % 4)) + bytes_rem_correction = 4 - (mps % 4); + + for (i = 0; i < hs_ep->desc_count; ++i) { + status = desc->status; + bytes_rem += status & DEV_DMA_NBYTES_MASK; + bytes_rem -= bytes_rem_correction; + + if (status & DEV_DMA_STS_MASK) + dev_err(hsotg->dev, "descriptor %d closed with %x\n", + i, status & DEV_DMA_STS_MASK); + + if (status & DEV_DMA_L) + break; + + desc++; + } + + return bytes_rem; +} + +/** + * dwc2_hsotg_handle_outdone - handle receiving OutDone/SetupDone from RXFIFO + * @hsotg: The device instance + * @epnum: The endpoint received from + * + * The RXFIFO has delivered an OutDone event, which means that the data + * transfer for an OUT endpoint has been completed, either by a short + * packet or by the finish of a transfer. + */ +static void dwc2_hsotg_handle_outdone(struct dwc2_hsotg *hsotg, int epnum) +{ + u32 epsize = dwc2_readl(hsotg, DOEPTSIZ(epnum)); + struct dwc2_hsotg_ep *hs_ep = hsotg->eps_out[epnum]; + struct dwc2_hsotg_req *hs_req = hs_ep->req; + struct usb_request *req = &hs_req->req; + unsigned int size_left = DXEPTSIZ_XFERSIZE_GET(epsize); + int result = 0; + + if (!hs_req) { + dev_dbg(hsotg->dev, "%s: no request active\n", __func__); + return; + } + + if (epnum == 0 && hsotg->ep0_state == DWC2_EP0_STATUS_OUT) { + dev_dbg(hsotg->dev, "zlp packet received\n"); + dwc2_hsotg_complete_request(hsotg, hs_ep, hs_req, 0); + dwc2_hsotg_enqueue_setup(hsotg); + return; + } + + if (using_desc_dma(hsotg)) + size_left = dwc2_gadget_get_xfersize_ddma(hs_ep); + + if (using_dma(hsotg)) { + unsigned int size_done; + + /* + * Calculate the size of the transfer by checking how much + * is left in the endpoint size register and then working it + * out from the amount we loaded for the transfer. + * + * We need to do this as DMA pointers are always 32bit aligned + * so may overshoot/undershoot the transfer. + */ + + size_done = hs_ep->size_loaded - size_left; + size_done += hs_ep->last_load; + + req->actual = size_done; + } + + /* if there is more request to do, schedule new transfer */ + if (req->actual < req->length && size_left == 0) { + dwc2_hsotg_start_req(hsotg, hs_ep, hs_req, true); + return; + } + + if (req->actual < req->length && req->short_not_ok) { + dev_dbg(hsotg->dev, "%s: got %d/%d (short not ok) => error\n", + __func__, req->actual, req->length); + + /* + * todo - what should we return here? there's no one else + * even bothering to check the status. + */ + } + + /* DDMA IN status phase will start from StsPhseRcvd interrupt */ + if (!using_desc_dma(hsotg) && epnum == 0 && + hsotg->ep0_state == DWC2_EP0_DATA_OUT) { + /* Move to STATUS IN */ + if (!hsotg->delayed_status) + dwc2_hsotg_ep0_zlp(hsotg, true); + } + + /* Set actual frame number for completed transfers */ + if (!using_desc_dma(hsotg) && hs_ep->isochronous) { + req->frame_number = hs_ep->target_frame; + dwc2_gadget_incr_frame_num(hs_ep); + } + + dwc2_hsotg_complete_request(hsotg, hs_ep, hs_req, result); +} + +/** + * dwc2_hsotg_handle_rx - RX FIFO has data + * @hsotg: The device instance + * + * The IRQ handler has detected that the RX FIFO has some data in it + * that requires processing, so find out what is in there and do the + * appropriate read. + * + * The RXFIFO is a true FIFO, the packets coming out are still in packet + * chunks, so if you have x packets received on an endpoint you'll get x + * FIFO events delivered, each with a packet's worth of data in it. + * + * When using DMA, we should not be processing events from the RXFIFO + * as the actual data should be sent to the memory directly and we turn + * on the completion interrupts to get notifications of transfer completion. + */ +static void dwc2_hsotg_handle_rx(struct dwc2_hsotg *hsotg) +{ + u32 grxstsr = dwc2_readl(hsotg, GRXSTSP); + u32 epnum, status, size; + + WARN_ON(using_dma(hsotg)); + + epnum = grxstsr & GRXSTS_EPNUM_MASK; + status = grxstsr & GRXSTS_PKTSTS_MASK; + + size = grxstsr & GRXSTS_BYTECNT_MASK; + size >>= GRXSTS_BYTECNT_SHIFT; + + dev_dbg(hsotg->dev, "%s: GRXSTSP=0x%08x (%d@%d)\n", + __func__, grxstsr, size, epnum); + + switch ((status & GRXSTS_PKTSTS_MASK) >> GRXSTS_PKTSTS_SHIFT) { + case GRXSTS_PKTSTS_GLOBALOUTNAK: + dev_dbg(hsotg->dev, "GLOBALOUTNAK\n"); + break; + + case GRXSTS_PKTSTS_OUTDONE: + dev_dbg(hsotg->dev, "OutDone (Frame=0x%08x)\n", + dwc2_hsotg_read_frameno(hsotg)); + + if (!using_dma(hsotg)) + dwc2_hsotg_handle_outdone(hsotg, epnum); + break; + + case GRXSTS_PKTSTS_SETUPDONE: + dev_dbg(hsotg->dev, + "SetupDone (Frame=0x%08x, DOPEPCTL=0x%08x)\n", + dwc2_hsotg_read_frameno(hsotg), + dwc2_readl(hsotg, DOEPCTL(0))); + /* + * Call dwc2_hsotg_handle_outdone here if it was not called from + * GRXSTS_PKTSTS_OUTDONE. That is, if the core didn't + * generate GRXSTS_PKTSTS_OUTDONE for setup packet. + */ + if (hsotg->ep0_state == DWC2_EP0_SETUP) + dwc2_hsotg_handle_outdone(hsotg, epnum); + break; + + case GRXSTS_PKTSTS_OUTRX: + dwc2_hsotg_rx_data(hsotg, epnum, size); + break; + + case GRXSTS_PKTSTS_SETUPRX: + dev_dbg(hsotg->dev, + "SetupRX (Frame=0x%08x, DOPEPCTL=0x%08x)\n", + dwc2_hsotg_read_frameno(hsotg), + dwc2_readl(hsotg, DOEPCTL(0))); + + WARN_ON(hsotg->ep0_state != DWC2_EP0_SETUP); + + dwc2_hsotg_rx_data(hsotg, epnum, size); + break; + + default: + dev_warn(hsotg->dev, "%s: unknown status %08x\n", + __func__, grxstsr); + + dwc2_hsotg_dump(hsotg); + break; + } +} + +/** + * dwc2_hsotg_ep0_mps - turn max packet size into register setting + * @mps: The maximum packet size in bytes. + */ +static u32 dwc2_hsotg_ep0_mps(unsigned int mps) +{ + switch (mps) { + case 64: + return D0EPCTL_MPS_64; + case 32: + return D0EPCTL_MPS_32; + case 16: + return D0EPCTL_MPS_16; + case 8: + return D0EPCTL_MPS_8; + } + + /* bad max packet size, warn and return invalid result */ + WARN_ON(1); + return (u32)-1; +} + +/** + * dwc2_hsotg_set_ep_maxpacket - set endpoint's max-packet field + * @hsotg: The driver state. + * @ep: The index number of the endpoint + * @mps: The maximum packet size in bytes + * @mc: The multicount value + * @dir_in: True if direction is in. + * + * Configure the maximum packet size for the given endpoint, updating + * the hardware control registers to reflect this. + */ +static void dwc2_hsotg_set_ep_maxpacket(struct dwc2_hsotg *hsotg, + unsigned int ep, unsigned int mps, + unsigned int mc, unsigned int dir_in) +{ + struct dwc2_hsotg_ep *hs_ep; + u32 reg; + + hs_ep = index_to_ep(hsotg, ep, dir_in); + if (!hs_ep) + return; + + if (ep == 0) { + u32 mps_bytes = mps; + + /* EP0 is a special case */ + mps = dwc2_hsotg_ep0_mps(mps_bytes); + if (mps > 3) + goto bad_mps; + hs_ep->ep.maxpacket = mps_bytes; + hs_ep->mc = 1; + } else { + if (mps > 1024) + goto bad_mps; + hs_ep->mc = mc; + if (mc > 3) + goto bad_mps; + hs_ep->ep.maxpacket = mps; + } + + if (dir_in) { + reg = dwc2_readl(hsotg, DIEPCTL(ep)); + reg &= ~DXEPCTL_MPS_MASK; + reg |= mps; + dwc2_writel(hsotg, reg, DIEPCTL(ep)); + } else { + reg = dwc2_readl(hsotg, DOEPCTL(ep)); + reg &= ~DXEPCTL_MPS_MASK; + reg |= mps; + dwc2_writel(hsotg, reg, DOEPCTL(ep)); + } + + return; + +bad_mps: + dev_err(hsotg->dev, "ep%d: bad mps of %d\n", ep, mps); +} + +/** + * dwc2_hsotg_txfifo_flush - flush Tx FIFO + * @hsotg: The driver state + * @idx: The index for the endpoint (0..15) + */ +static void dwc2_hsotg_txfifo_flush(struct dwc2_hsotg *hsotg, unsigned int idx) +{ + dwc2_writel(hsotg, GRSTCTL_TXFNUM(idx) | GRSTCTL_TXFFLSH, + GRSTCTL); + + /* wait until the fifo is flushed */ + if (dwc2_hsotg_wait_bit_clear(hsotg, GRSTCTL, GRSTCTL_TXFFLSH, 100)) + dev_warn(hsotg->dev, "%s: timeout flushing fifo GRSTCTL_TXFFLSH\n", + __func__); +} + +/** + * dwc2_hsotg_trytx - check to see if anything needs transmitting + * @hsotg: The driver state + * @hs_ep: The driver endpoint to check. + * + * Check to see if there is a request that has data to send, and if so + * make an attempt to write data into the FIFO. + */ +static int dwc2_hsotg_trytx(struct dwc2_hsotg *hsotg, + struct dwc2_hsotg_ep *hs_ep) +{ + struct dwc2_hsotg_req *hs_req = hs_ep->req; + + if (!hs_ep->dir_in || !hs_req) { + /** + * if request is not enqueued, we disable interrupts + * for endpoints, excepting ep0 + */ + if (hs_ep->index != 0) + dwc2_hsotg_ctrl_epint(hsotg, hs_ep->index, + hs_ep->dir_in, 0); + return 0; + } + + if (hs_req->req.actual < hs_req->req.length) { + dev_dbg(hsotg->dev, "trying to write more for ep%d\n", + hs_ep->index); + return dwc2_hsotg_write_fifo(hsotg, hs_ep, hs_req); + } + + return 0; +} + +/** + * dwc2_hsotg_complete_in - complete IN transfer + * @hsotg: The device state. + * @hs_ep: The endpoint that has just completed. + * + * An IN transfer has been completed, update the transfer's state and then + * call the relevant completion routines. + */ +static void dwc2_hsotg_complete_in(struct dwc2_hsotg *hsotg, + struct dwc2_hsotg_ep *hs_ep) +{ + struct dwc2_hsotg_req *hs_req = hs_ep->req; + u32 epsize = dwc2_readl(hsotg, DIEPTSIZ(hs_ep->index)); + int size_left, size_done; + + if (!hs_req) { + dev_dbg(hsotg->dev, "XferCompl but no req\n"); + return; + } + + /* Finish ZLP handling for IN EP0 transactions */ + if (hs_ep->index == 0 && hsotg->ep0_state == DWC2_EP0_STATUS_IN) { + dev_dbg(hsotg->dev, "zlp packet sent\n"); + + /* + * While send zlp for DWC2_EP0_STATUS_IN EP direction was + * changed to IN. Change back to complete OUT transfer request + */ + hs_ep->dir_in = 0; + + dwc2_hsotg_complete_request(hsotg, hs_ep, hs_req, 0); + if (hsotg->test_mode) { + int ret; + + ret = dwc2_hsotg_set_test_mode(hsotg, hsotg->test_mode); + if (ret < 0) { + dev_dbg(hsotg->dev, "Invalid Test #%d\n", + hsotg->test_mode); + dwc2_hsotg_stall_ep0(hsotg); + return; + } + } + dwc2_hsotg_enqueue_setup(hsotg); + return; + } + + /* + * Calculate the size of the transfer by checking how much is left + * in the endpoint size register and then working it out from + * the amount we loaded for the transfer. + * + * We do this even for DMA, as the transfer may have incremented + * past the end of the buffer (DMA transfers are always 32bit + * aligned). + */ + if (using_desc_dma(hsotg)) { + size_left = dwc2_gadget_get_xfersize_ddma(hs_ep); + if (size_left < 0) + dev_err(hsotg->dev, "error parsing DDMA results %d\n", + size_left); + } else { + size_left = DXEPTSIZ_XFERSIZE_GET(epsize); + } + + size_done = hs_ep->size_loaded - size_left; + size_done += hs_ep->last_load; + + if (hs_req->req.actual != size_done) + dev_dbg(hsotg->dev, "%s: adjusting size done %d => %d\n", + __func__, hs_req->req.actual, size_done); + + hs_req->req.actual = size_done; + dev_dbg(hsotg->dev, "req->length:%d req->actual:%d req->zero:%d\n", + hs_req->req.length, hs_req->req.actual, hs_req->req.zero); + + if (!size_left && hs_req->req.actual < hs_req->req.length) { + dev_dbg(hsotg->dev, "%s trying more for req...\n", __func__); + dwc2_hsotg_start_req(hsotg, hs_ep, hs_req, true); + return; + } + + /* Zlp for all endpoints in non DDMA, for ep0 only in DATA IN stage */ + if (hs_ep->send_zlp) { + hs_ep->send_zlp = 0; + if (!using_desc_dma(hsotg)) { + dwc2_hsotg_program_zlp(hsotg, hs_ep); + /* transfer will be completed on next complete interrupt */ + return; + } + } + + if (hs_ep->index == 0 && hsotg->ep0_state == DWC2_EP0_DATA_IN) { + /* Move to STATUS OUT */ + dwc2_hsotg_ep0_zlp(hsotg, false); + return; + } + + /* Set actual frame number for completed transfers */ + if (!using_desc_dma(hsotg) && hs_ep->isochronous) { + hs_req->req.frame_number = hs_ep->target_frame; + dwc2_gadget_incr_frame_num(hs_ep); + } + + dwc2_hsotg_complete_request(hsotg, hs_ep, hs_req, 0); +} + +/** + * dwc2_gadget_read_ep_interrupts - reads interrupts for given ep + * @hsotg: The device state. + * @idx: Index of ep. + * @dir_in: Endpoint direction 1-in 0-out. + * + * Reads for endpoint with given index and direction, by masking + * epint_reg with coresponding mask. + */ +static u32 dwc2_gadget_read_ep_interrupts(struct dwc2_hsotg *hsotg, + unsigned int idx, int dir_in) +{ + u32 epmsk_reg = dir_in ? DIEPMSK : DOEPMSK; + u32 epint_reg = dir_in ? DIEPINT(idx) : DOEPINT(idx); + u32 ints; + u32 mask; + u32 diepempmsk; + + mask = dwc2_readl(hsotg, epmsk_reg); + diepempmsk = dwc2_readl(hsotg, DIEPEMPMSK); + mask |= ((diepempmsk >> idx) & 0x1) ? DIEPMSK_TXFIFOEMPTY : 0; + mask |= DXEPINT_SETUP_RCVD; + + ints = dwc2_readl(hsotg, epint_reg); + ints &= mask; + return ints; +} + +/** + * dwc2_gadget_handle_ep_disabled - handle DXEPINT_EPDISBLD + * @hs_ep: The endpoint on which interrupt is asserted. + * + * This interrupt indicates that the endpoint has been disabled per the + * application's request. + * + * For IN endpoints flushes txfifo, in case of BULK clears DCTL_CGNPINNAK, + * in case of ISOC completes current request. + * + * For ISOC-OUT endpoints completes expired requests. If there is remaining + * request starts it. + */ +static void dwc2_gadget_handle_ep_disabled(struct dwc2_hsotg_ep *hs_ep) +{ + struct dwc2_hsotg *hsotg = hs_ep->parent; + struct dwc2_hsotg_req *hs_req; + unsigned char idx = hs_ep->index; + int dir_in = hs_ep->dir_in; + u32 epctl_reg = dir_in ? DIEPCTL(idx) : DOEPCTL(idx); + int dctl = dwc2_readl(hsotg, DCTL); + + dev_dbg(hsotg->dev, "%s: EPDisbld\n", __func__); + + if (dir_in) { + int epctl = dwc2_readl(hsotg, epctl_reg); + + dwc2_hsotg_txfifo_flush(hsotg, hs_ep->fifo_index); + + if ((epctl & DXEPCTL_STALL) && (epctl & DXEPCTL_EPTYPE_BULK)) { + int dctl = dwc2_readl(hsotg, DCTL); + + dctl |= DCTL_CGNPINNAK; + dwc2_writel(hsotg, dctl, DCTL); + } + } else { + + if (dctl & DCTL_GOUTNAKSTS) { + dctl |= DCTL_CGOUTNAK; + dwc2_writel(hsotg, dctl, DCTL); + } + } + + if (!hs_ep->isochronous) + return; + + if (list_empty(&hs_ep->queue)) { + dev_dbg(hsotg->dev, "%s: complete_ep 0x%p, ep->queue empty!\n", + __func__, hs_ep); + return; + } + + do { + hs_req = get_ep_head(hs_ep); + if (hs_req) { + hs_req->req.frame_number = hs_ep->target_frame; + hs_req->req.actual = 0; + dwc2_hsotg_complete_request(hsotg, hs_ep, hs_req, + -ENODATA); + } + dwc2_gadget_incr_frame_num(hs_ep); + /* Update current frame number value. */ + hsotg->frame_number = dwc2_hsotg_read_frameno(hsotg); + } while (dwc2_gadget_target_frame_elapsed(hs_ep)); +} + +/** + * dwc2_gadget_handle_out_token_ep_disabled - handle DXEPINT_OUTTKNEPDIS + * @ep: The endpoint on which interrupt is asserted. + * + * This is starting point for ISOC-OUT transfer, synchronization done with + * first out token received from host while corresponding EP is disabled. + * + * Device does not know initial frame in which out token will come. For this + * HW generates OUTTKNEPDIS - out token is received while EP is disabled. Upon + * getting this interrupt SW starts calculation for next transfer frame. + */ +static void dwc2_gadget_handle_out_token_ep_disabled(struct dwc2_hsotg_ep *ep) +{ + struct dwc2_hsotg *hsotg = ep->parent; + struct dwc2_hsotg_req *hs_req; + int dir_in = ep->dir_in; + + if (dir_in || !ep->isochronous) + return; + + if (using_desc_dma(hsotg)) { + if (ep->target_frame == TARGET_FRAME_INITIAL) { + /* Start first ISO Out */ + ep->target_frame = hsotg->frame_number; + dwc2_gadget_start_isoc_ddma(ep); + } + return; + } + + if (ep->target_frame == TARGET_FRAME_INITIAL) { + u32 ctrl; + + ep->target_frame = hsotg->frame_number; + if (ep->interval > 1) { + ctrl = dwc2_readl(hsotg, DOEPCTL(ep->index)); + if (ep->target_frame & 0x1) + ctrl |= DXEPCTL_SETODDFR; + else + ctrl |= DXEPCTL_SETEVENFR; + + dwc2_writel(hsotg, ctrl, DOEPCTL(ep->index)); + } + } + + while (dwc2_gadget_target_frame_elapsed(ep)) { + hs_req = get_ep_head(ep); + if (hs_req) { + hs_req->req.frame_number = ep->target_frame; + hs_req->req.actual = 0; + dwc2_hsotg_complete_request(hsotg, ep, hs_req, -ENODATA); + } + + dwc2_gadget_incr_frame_num(ep); + /* Update current frame number value. */ + hsotg->frame_number = dwc2_hsotg_read_frameno(hsotg); + } + + if (!ep->req) + dwc2_gadget_start_next_request(ep); + +} + +static void dwc2_hsotg_ep_stop_xfr(struct dwc2_hsotg *hsotg, + struct dwc2_hsotg_ep *hs_ep); + +/** + * dwc2_gadget_handle_nak - handle NAK interrupt + * @hs_ep: The endpoint on which interrupt is asserted. + * + * This is starting point for ISOC-IN transfer, synchronization done with + * first IN token received from host while corresponding EP is disabled. + * + * Device does not know when first one token will arrive from host. On first + * token arrival HW generates 2 interrupts: 'in token received while FIFO empty' + * and 'NAK'. NAK interrupt for ISOC-IN means that token has arrived and ZLP was + * sent in response to that as there was no data in FIFO. SW is basing on this + * interrupt to obtain frame in which token has come and then based on the + * interval calculates next frame for transfer. + */ +static void dwc2_gadget_handle_nak(struct dwc2_hsotg_ep *hs_ep) +{ + struct dwc2_hsotg *hsotg = hs_ep->parent; + struct dwc2_hsotg_req *hs_req; + int dir_in = hs_ep->dir_in; + u32 ctrl; + + if (!dir_in || !hs_ep->isochronous) + return; + + if (hs_ep->target_frame == TARGET_FRAME_INITIAL) { + + if (using_desc_dma(hsotg)) { + hs_ep->target_frame = hsotg->frame_number; + dwc2_gadget_incr_frame_num(hs_ep); + + /* In service interval mode target_frame must + * be set to last (u)frame of the service interval. + */ + if (hsotg->params.service_interval) { + /* Set target_frame to the first (u)frame of + * the service interval + */ + hs_ep->target_frame &= ~hs_ep->interval + 1; + + /* Set target_frame to the last (u)frame of + * the service interval + */ + dwc2_gadget_incr_frame_num(hs_ep); + dwc2_gadget_dec_frame_num_by_one(hs_ep); + } + + dwc2_gadget_start_isoc_ddma(hs_ep); + return; + } + + hs_ep->target_frame = hsotg->frame_number; + if (hs_ep->interval > 1) { + u32 ctrl = dwc2_readl(hsotg, + DIEPCTL(hs_ep->index)); + if (hs_ep->target_frame & 0x1) + ctrl |= DXEPCTL_SETODDFR; + else + ctrl |= DXEPCTL_SETEVENFR; + + dwc2_writel(hsotg, ctrl, DIEPCTL(hs_ep->index)); + } + } + + if (using_desc_dma(hsotg)) + return; + + ctrl = dwc2_readl(hsotg, DIEPCTL(hs_ep->index)); + if (ctrl & DXEPCTL_EPENA) + dwc2_hsotg_ep_stop_xfr(hsotg, hs_ep); + else + dwc2_hsotg_txfifo_flush(hsotg, hs_ep->fifo_index); + + while (dwc2_gadget_target_frame_elapsed(hs_ep)) { + hs_req = get_ep_head(hs_ep); + if (hs_req) { + hs_req->req.frame_number = hs_ep->target_frame; + hs_req->req.actual = 0; + dwc2_hsotg_complete_request(hsotg, hs_ep, hs_req, -ENODATA); + } + + dwc2_gadget_incr_frame_num(hs_ep); + /* Update current frame number value. */ + hsotg->frame_number = dwc2_hsotg_read_frameno(hsotg); + } + + if (!hs_ep->req) + dwc2_gadget_start_next_request(hs_ep); +} + +/** + * dwc2_hsotg_epint - handle an in/out endpoint interrupt + * @hsotg: The driver state + * @idx: The index for the endpoint (0..15) + * @dir_in: Set if this is an IN endpoint + * + * Process and clear any interrupt pending for an individual endpoint + */ +static void dwc2_hsotg_epint(struct dwc2_hsotg *hsotg, unsigned int idx, + int dir_in) +{ + struct dwc2_hsotg_ep *hs_ep = index_to_ep(hsotg, idx, dir_in); + u32 epint_reg = dir_in ? DIEPINT(idx) : DOEPINT(idx); + u32 epctl_reg = dir_in ? DIEPCTL(idx) : DOEPCTL(idx); + u32 epsiz_reg = dir_in ? DIEPTSIZ(idx) : DOEPTSIZ(idx); + u32 ints; + + ints = dwc2_gadget_read_ep_interrupts(hsotg, idx, dir_in); + + /* Clear endpoint interrupts */ + dwc2_writel(hsotg, ints, epint_reg); + + if (!hs_ep) { + dev_err(hsotg->dev, "%s:Interrupt for unconfigured ep%d(%s)\n", + __func__, idx, dir_in ? "in" : "out"); + return; + } + + dev_dbg(hsotg->dev, "%s: ep%d(%s) DxEPINT=0x%08x\n", + __func__, idx, dir_in ? "in" : "out", ints); + + /* Don't process XferCompl interrupt if it is a setup packet */ + if (idx == 0 && (ints & (DXEPINT_SETUP | DXEPINT_SETUP_RCVD))) + ints &= ~DXEPINT_XFERCOMPL; + + /* + * Don't process XferCompl interrupt in DDMA if EP0 is still in SETUP + * stage and xfercomplete was generated without SETUP phase done + * interrupt. SW should parse received setup packet only after host's + * exit from setup phase of control transfer. + */ + if (using_desc_dma(hsotg) && idx == 0 && !hs_ep->dir_in && + hsotg->ep0_state == DWC2_EP0_SETUP && !(ints & DXEPINT_SETUP)) + ints &= ~DXEPINT_XFERCOMPL; + + if (ints & DXEPINT_XFERCOMPL) { + dev_dbg(hsotg->dev, + "%s: XferCompl: DxEPCTL=0x%08x, DXEPTSIZ=%08x\n", + __func__, dwc2_readl(hsotg, epctl_reg), + dwc2_readl(hsotg, epsiz_reg)); + + /* In DDMA handle isochronous requests separately */ + if (using_desc_dma(hsotg) && hs_ep->isochronous) { + dwc2_gadget_complete_isoc_request_ddma(hs_ep); + } else if (dir_in) { + /* + * We get OutDone from the FIFO, so we only + * need to look at completing IN requests here + * if operating slave mode + */ + if (!hs_ep->isochronous || !(ints & DXEPINT_NAKINTRPT)) + dwc2_hsotg_complete_in(hsotg, hs_ep); + + if (idx == 0 && !hs_ep->req) + dwc2_hsotg_enqueue_setup(hsotg); + } else if (using_dma(hsotg)) { + /* + * We're using DMA, we need to fire an OutDone here + * as we ignore the RXFIFO. + */ + if (!hs_ep->isochronous || !(ints & DXEPINT_OUTTKNEPDIS)) + dwc2_hsotg_handle_outdone(hsotg, idx); + } + } + + if (ints & DXEPINT_EPDISBLD) + dwc2_gadget_handle_ep_disabled(hs_ep); + + if (ints & DXEPINT_OUTTKNEPDIS) + dwc2_gadget_handle_out_token_ep_disabled(hs_ep); + + if (ints & DXEPINT_NAKINTRPT) + dwc2_gadget_handle_nak(hs_ep); + + if (ints & DXEPINT_AHBERR) + dev_dbg(hsotg->dev, "%s: AHBErr\n", __func__); + + if (ints & DXEPINT_SETUP) { /* Setup or Timeout */ + dev_dbg(hsotg->dev, "%s: Setup/Timeout\n", __func__); + + if (using_dma(hsotg) && idx == 0) { + /* + * this is the notification we've received a + * setup packet. In non-DMA mode we'd get this + * from the RXFIFO, instead we need to process + * the setup here. + */ + + if (dir_in) + WARN_ON_ONCE(1); + else + dwc2_hsotg_handle_outdone(hsotg, 0); + } + } + + if (ints & DXEPINT_STSPHSERCVD) { + dev_dbg(hsotg->dev, "%s: StsPhseRcvd\n", __func__); + + /* Safety check EP0 state when STSPHSERCVD asserted */ + if (hsotg->ep0_state == DWC2_EP0_DATA_OUT) { + /* Move to STATUS IN for DDMA */ + if (using_desc_dma(hsotg)) { + if (!hsotg->delayed_status) + dwc2_hsotg_ep0_zlp(hsotg, true); + else + /* In case of 3 stage Control Write with delayed + * status, when Status IN transfer started + * before STSPHSERCVD asserted, NAKSTS bit not + * cleared by CNAK in dwc2_hsotg_start_req() + * function. Clear now NAKSTS to allow complete + * transfer. + */ + dwc2_set_bit(hsotg, DIEPCTL(0), + DXEPCTL_CNAK); + } + } + + } + + if (ints & DXEPINT_BACK2BACKSETUP) + dev_dbg(hsotg->dev, "%s: B2BSetup/INEPNakEff\n", __func__); + + if (ints & DXEPINT_BNAINTR) { + dev_dbg(hsotg->dev, "%s: BNA interrupt\n", __func__); + if (hs_ep->isochronous) + dwc2_gadget_handle_isoc_bna(hs_ep); + } + + if (dir_in && !hs_ep->isochronous) { + /* not sure if this is important, but we'll clear it anyway */ + if (ints & DXEPINT_INTKNTXFEMP) { + dev_dbg(hsotg->dev, "%s: ep%d: INTknTXFEmpMsk\n", + __func__, idx); + } + + /* this probably means something bad is happening */ + if (ints & DXEPINT_INTKNEPMIS) { + dev_warn(hsotg->dev, "%s: ep%d: INTknEP\n", + __func__, idx); + } + + /* FIFO has space or is empty (see GAHBCFG) */ + if (hsotg->dedicated_fifos && + ints & DXEPINT_TXFEMP) { + dev_dbg(hsotg->dev, "%s: ep%d: TxFIFOEmpty\n", + __func__, idx); + if (!using_dma(hsotg)) + dwc2_hsotg_trytx(hsotg, hs_ep); + } + } +} + +/** + * dwc2_hsotg_irq_enumdone - Handle EnumDone interrupt (enumeration done) + * @hsotg: The device state. + * + * Handle updating the device settings after the enumeration phase has + * been completed. + */ +static void dwc2_hsotg_irq_enumdone(struct dwc2_hsotg *hsotg) +{ + u32 dsts = dwc2_readl(hsotg, DSTS); + int ep0_mps = 0, ep_mps = 8; + + /* + * This should signal the finish of the enumeration phase + * of the USB handshaking, so we should now know what rate + * we connected at. + */ + + dev_dbg(hsotg->dev, "EnumDone (DSTS=0x%08x)\n", dsts); + + /* + * note, since we're limited by the size of transfer on EP0, and + * it seems IN transfers must be a even number of packets we do + * not advertise a 64byte MPS on EP0. + */ + + /* catch both EnumSpd_FS and EnumSpd_FS48 */ + switch ((dsts & DSTS_ENUMSPD_MASK) >> DSTS_ENUMSPD_SHIFT) { + case DSTS_ENUMSPD_FS: + case DSTS_ENUMSPD_FS48: + hsotg->gadget.speed = USB_SPEED_FULL; + ep0_mps = EP0_MPS_LIMIT; + ep_mps = 1023; + break; + + case DSTS_ENUMSPD_HS: + hsotg->gadget.speed = USB_SPEED_HIGH; + ep0_mps = EP0_MPS_LIMIT; + ep_mps = 1024; + break; + + case DSTS_ENUMSPD_LS: + hsotg->gadget.speed = USB_SPEED_LOW; + ep0_mps = 8; + ep_mps = 8; + /* + * note, we don't actually support LS in this driver at the + * moment, and the documentation seems to imply that it isn't + * supported by the PHYs on some of the devices. + */ + break; + } + dev_info(hsotg->dev, "new device is %s\n", + usb_speed_string(hsotg->gadget.speed)); + + /* + * we should now know the maximum packet size for an + * endpoint, so set the endpoints to a default value. + */ + + if (ep0_mps) { + int i; + /* Initialize ep0 for both in and out directions */ + dwc2_hsotg_set_ep_maxpacket(hsotg, 0, ep0_mps, 0, 1); + dwc2_hsotg_set_ep_maxpacket(hsotg, 0, ep0_mps, 0, 0); + for (i = 1; i < hsotg->num_of_eps; i++) { + if (hsotg->eps_in[i]) + dwc2_hsotg_set_ep_maxpacket(hsotg, i, ep_mps, + 0, 1); + if (hsotg->eps_out[i]) + dwc2_hsotg_set_ep_maxpacket(hsotg, i, ep_mps, + 0, 0); + } + } + + /* ensure after enumeration our EP0 is active */ + + dwc2_hsotg_enqueue_setup(hsotg); + + dev_dbg(hsotg->dev, "EP0: DIEPCTL0=0x%08x, DOEPCTL0=0x%08x\n", + dwc2_readl(hsotg, DIEPCTL0), + dwc2_readl(hsotg, DOEPCTL0)); +} + +/** + * kill_all_requests - remove all requests from the endpoint's queue + * @hsotg: The device state. + * @ep: The endpoint the requests may be on. + * @result: The result code to use. + * + * Go through the requests on the given endpoint and mark them + * completed with the given result code. + */ +static void kill_all_requests(struct dwc2_hsotg *hsotg, + struct dwc2_hsotg_ep *ep, + int result) +{ + unsigned int size; + + ep->req = NULL; + + while (!list_empty(&ep->queue)) { + struct dwc2_hsotg_req *req = get_ep_head(ep); + + dwc2_hsotg_complete_request(hsotg, ep, req, result); + } + + if (!hsotg->dedicated_fifos) + return; + size = (dwc2_readl(hsotg, DTXFSTS(ep->fifo_index)) & 0xffff) * 4; + if (size < ep->fifo_size) + dwc2_hsotg_txfifo_flush(hsotg, ep->fifo_index); +} + +/** + * dwc2_hsotg_disconnect - disconnect service + * @hsotg: The device state. + * + * The device has been disconnected. Remove all current + * transactions and signal the gadget driver that this + * has happened. + */ +void dwc2_hsotg_disconnect(struct dwc2_hsotg *hsotg) +{ + unsigned int ep; + + if (!hsotg->connected) + return; + + hsotg->connected = 0; + hsotg->test_mode = 0; + + /* all endpoints should be shutdown */ + for (ep = 0; ep < hsotg->num_of_eps; ep++) { + if (hsotg->eps_in[ep]) + kill_all_requests(hsotg, hsotg->eps_in[ep], + -ESHUTDOWN); + if (hsotg->eps_out[ep]) + kill_all_requests(hsotg, hsotg->eps_out[ep], + -ESHUTDOWN); + } + + call_gadget(hsotg, disconnect); + hsotg->lx_state = DWC2_L3; + + usb_gadget_set_state(&hsotg->gadget, USB_STATE_NOTATTACHED); +} + +/** + * dwc2_hsotg_irq_fifoempty - TX FIFO empty interrupt handler + * @hsotg: The device state: + * @periodic: True if this is a periodic FIFO interrupt + */ +static void dwc2_hsotg_irq_fifoempty(struct dwc2_hsotg *hsotg, bool periodic) +{ + struct dwc2_hsotg_ep *ep; + int epno, ret; + + /* look through for any more data to transmit */ + for (epno = 0; epno < hsotg->num_of_eps; epno++) { + ep = index_to_ep(hsotg, epno, 1); + + if (!ep) + continue; + + if (!ep->dir_in) + continue; + + if ((periodic && !ep->periodic) || + (!periodic && ep->periodic)) + continue; + + ret = dwc2_hsotg_trytx(hsotg, ep); + if (ret < 0) + break; + } +} + +/* IRQ flags which will trigger a retry around the IRQ loop */ +#define IRQ_RETRY_MASK (GINTSTS_NPTXFEMP | \ + GINTSTS_PTXFEMP | \ + GINTSTS_RXFLVL) + +static int dwc2_hsotg_ep_disable(struct usb_ep *ep); +/** + * dwc2_hsotg_core_init_disconnected - issue softreset to the core + * @hsotg: The device state + * @is_usb_reset: Usb resetting flag + * + * Issue a soft reset to the core, and await the core finishing it. + */ +void dwc2_hsotg_core_init_disconnected(struct dwc2_hsotg *hsotg, + bool is_usb_reset) +{ + u32 intmsk; + u32 val; + u32 usbcfg; + u32 dcfg = 0; + int ep; + + /* Kill any ep0 requests as controller will be reinitialized */ + kill_all_requests(hsotg, hsotg->eps_out[0], -ECONNRESET); + + if (!is_usb_reset) { + if (dwc2_core_reset(hsotg, true)) + return; + } else { + /* all endpoints should be shutdown */ + for (ep = 1; ep < hsotg->num_of_eps; ep++) { + if (hsotg->eps_in[ep]) + dwc2_hsotg_ep_disable(&hsotg->eps_in[ep]->ep); + if (hsotg->eps_out[ep]) + dwc2_hsotg_ep_disable(&hsotg->eps_out[ep]->ep); + } + } + + /* + * we must now enable ep0 ready for host detection and then + * set configuration. + */ + + /* keep other bits untouched (so e.g. forced modes are not lost) */ + usbcfg = dwc2_readl(hsotg, GUSBCFG); + usbcfg &= ~GUSBCFG_TOUTCAL_MASK; + usbcfg |= GUSBCFG_TOUTCAL(7); + + /* remove the HNP/SRP and set the PHY */ + usbcfg &= ~(GUSBCFG_SRPCAP | GUSBCFG_HNPCAP); + dwc2_writel(hsotg, usbcfg, GUSBCFG); + + dwc2_phy_init(hsotg, true); + + dwc2_hsotg_init_fifo(hsotg); + + if (!is_usb_reset) + dwc2_set_bit(hsotg, DCTL, DCTL_SFTDISCON); + + dcfg |= DCFG_EPMISCNT(1); + + switch (hsotg->params.speed) { + case DWC2_SPEED_PARAM_LOW: + dcfg |= DCFG_DEVSPD_LS; + break; + case DWC2_SPEED_PARAM_FULL: + if (hsotg->params.phy_type == DWC2_PHY_TYPE_PARAM_FS) + dcfg |= DCFG_DEVSPD_FS48; + else + dcfg |= DCFG_DEVSPD_FS; + break; + default: + dcfg |= DCFG_DEVSPD_HS; + } + + if (hsotg->params.ipg_isoc_en) + dcfg |= DCFG_IPG_ISOC_SUPPORDED; + + dwc2_writel(hsotg, dcfg, DCFG); + + /* Clear any pending OTG interrupts */ + dwc2_writel(hsotg, 0xffffffff, GOTGINT); + + /* Clear any pending interrupts */ + dwc2_writel(hsotg, 0xffffffff, GINTSTS); + intmsk = GINTSTS_ERLYSUSP | GINTSTS_SESSREQINT | + GINTSTS_GOUTNAKEFF | GINTSTS_GINNAKEFF | + GINTSTS_USBRST | GINTSTS_RESETDET | + GINTSTS_ENUMDONE | GINTSTS_OTGINT | + GINTSTS_USBSUSP | GINTSTS_WKUPINT | + GINTSTS_LPMTRANRCVD; + + if (!using_desc_dma(hsotg)) + intmsk |= GINTSTS_INCOMPL_SOIN | GINTSTS_INCOMPL_SOOUT; + + if (!hsotg->params.external_id_pin_ctl) + intmsk |= GINTSTS_CONIDSTSCHNG; + + dwc2_writel(hsotg, intmsk, GINTMSK); + + if (using_dma(hsotg)) { + dwc2_writel(hsotg, GAHBCFG_GLBL_INTR_EN | GAHBCFG_DMA_EN | + hsotg->params.ahbcfg, + GAHBCFG); + + /* Set DDMA mode support in the core if needed */ + if (using_desc_dma(hsotg)) + dwc2_set_bit(hsotg, DCFG, DCFG_DESCDMA_EN); + + } else { + dwc2_writel(hsotg, ((hsotg->dedicated_fifos) ? + (GAHBCFG_NP_TXF_EMP_LVL | + GAHBCFG_P_TXF_EMP_LVL) : 0) | + GAHBCFG_GLBL_INTR_EN, GAHBCFG); + } + + /* + * If INTknTXFEmpMsk is enabled, it's important to disable ep interrupts + * when we have no data to transfer. Otherwise we get being flooded by + * interrupts. + */ + + dwc2_writel(hsotg, ((hsotg->dedicated_fifos && !using_dma(hsotg)) ? + DIEPMSK_TXFIFOEMPTY | DIEPMSK_INTKNTXFEMPMSK : 0) | + DIEPMSK_EPDISBLDMSK | DIEPMSK_XFERCOMPLMSK | + DIEPMSK_TIMEOUTMSK | DIEPMSK_AHBERRMSK, + DIEPMSK); + + /* + * don't need XferCompl, we get that from RXFIFO in slave mode. In + * DMA mode we may need this and StsPhseRcvd. + */ + dwc2_writel(hsotg, (using_dma(hsotg) ? (DIEPMSK_XFERCOMPLMSK | + DOEPMSK_STSPHSERCVDMSK) : 0) | + DOEPMSK_EPDISBLDMSK | DOEPMSK_AHBERRMSK | + DOEPMSK_SETUPMSK, + DOEPMSK); + + /* Enable BNA interrupt for DDMA */ + if (using_desc_dma(hsotg)) { + dwc2_set_bit(hsotg, DOEPMSK, DOEPMSK_BNAMSK); + dwc2_set_bit(hsotg, DIEPMSK, DIEPMSK_BNAININTRMSK); + } + + /* Enable Service Interval mode if supported */ + if (using_desc_dma(hsotg) && hsotg->params.service_interval) + dwc2_set_bit(hsotg, DCTL, DCTL_SERVICE_INTERVAL_SUPPORTED); + + dwc2_writel(hsotg, 0, DAINTMSK); + + dev_dbg(hsotg->dev, "EP0: DIEPCTL0=0x%08x, DOEPCTL0=0x%08x\n", + dwc2_readl(hsotg, DIEPCTL0), + dwc2_readl(hsotg, DOEPCTL0)); + + /* enable in and out endpoint interrupts */ + dwc2_hsotg_en_gsint(hsotg, GINTSTS_OEPINT | GINTSTS_IEPINT); + + /* + * Enable the RXFIFO when in slave mode, as this is how we collect + * the data. In DMA mode, we get events from the FIFO but also + * things we cannot process, so do not use it. + */ + if (!using_dma(hsotg)) + dwc2_hsotg_en_gsint(hsotg, GINTSTS_RXFLVL); + + /* Enable interrupts for EP0 in and out */ + dwc2_hsotg_ctrl_epint(hsotg, 0, 0, 1); + dwc2_hsotg_ctrl_epint(hsotg, 0, 1, 1); + + if (!is_usb_reset) { + dwc2_set_bit(hsotg, DCTL, DCTL_PWRONPRGDONE); + udelay(10); /* see openiboot */ + dwc2_clear_bit(hsotg, DCTL, DCTL_PWRONPRGDONE); + } + + dev_dbg(hsotg->dev, "DCTL=0x%08x\n", dwc2_readl(hsotg, DCTL)); + + /* + * DxEPCTL_USBActEp says RO in manual, but seems to be set by + * writing to the EPCTL register.. + */ + + /* set to read 1 8byte packet */ + dwc2_writel(hsotg, DXEPTSIZ_MC(1) | DXEPTSIZ_PKTCNT(1) | + DXEPTSIZ_XFERSIZE(8), DOEPTSIZ0); + + dwc2_writel(hsotg, dwc2_hsotg_ep0_mps(hsotg->eps_out[0]->ep.maxpacket) | + DXEPCTL_CNAK | DXEPCTL_EPENA | + DXEPCTL_USBACTEP, + DOEPCTL0); + + /* enable, but don't activate EP0in */ + dwc2_writel(hsotg, dwc2_hsotg_ep0_mps(hsotg->eps_out[0]->ep.maxpacket) | + DXEPCTL_USBACTEP, DIEPCTL0); + + /* clear global NAKs */ + val = DCTL_CGOUTNAK | DCTL_CGNPINNAK; + if (!is_usb_reset) + val |= DCTL_SFTDISCON; + dwc2_set_bit(hsotg, DCTL, val); + + /* configure the core to support LPM */ + dwc2_gadget_init_lpm(hsotg); + + /* program GREFCLK register if needed */ + if (using_desc_dma(hsotg) && hsotg->params.service_interval) + dwc2_gadget_program_ref_clk(hsotg); + + /* must be at-least 3ms to allow bus to see disconnect */ + mdelay(3); + + hsotg->lx_state = DWC2_L0; + + dwc2_hsotg_enqueue_setup(hsotg); + + dev_dbg(hsotg->dev, "EP0: DIEPCTL0=0x%08x, DOEPCTL0=0x%08x\n", + dwc2_readl(hsotg, DIEPCTL0), + dwc2_readl(hsotg, DOEPCTL0)); +} + +void dwc2_hsotg_core_disconnect(struct dwc2_hsotg *hsotg) +{ + /* set the soft-disconnect bit */ + dwc2_set_bit(hsotg, DCTL, DCTL_SFTDISCON); +} + +void dwc2_hsotg_core_connect(struct dwc2_hsotg *hsotg) +{ + /* remove the soft-disconnect and let's go */ + if (!hsotg->role_sw || (dwc2_readl(hsotg, GOTGCTL) & GOTGCTL_BSESVLD)) + dwc2_clear_bit(hsotg, DCTL, DCTL_SFTDISCON); +} + +/** + * dwc2_gadget_handle_incomplete_isoc_in - handle incomplete ISO IN Interrupt. + * @hsotg: The device state: + * + * This interrupt indicates one of the following conditions occurred while + * transmitting an ISOC transaction. + * - Corrupted IN Token for ISOC EP. + * - Packet not complete in FIFO. + * + * The following actions will be taken: + * - Determine the EP + * - Disable EP; when 'Endpoint Disabled' interrupt is received Flush FIFO + */ +static void dwc2_gadget_handle_incomplete_isoc_in(struct dwc2_hsotg *hsotg) +{ + struct dwc2_hsotg_ep *hs_ep; + u32 epctrl; + u32 daintmsk; + u32 idx; + + dev_dbg(hsotg->dev, "Incomplete isoc in interrupt received:\n"); + + daintmsk = dwc2_readl(hsotg, DAINTMSK); + + for (idx = 1; idx < hsotg->num_of_eps; idx++) { + hs_ep = hsotg->eps_in[idx]; + /* Proceed only unmasked ISOC EPs */ + if ((BIT(idx) & ~daintmsk) || !hs_ep->isochronous) + continue; + + epctrl = dwc2_readl(hsotg, DIEPCTL(idx)); + if ((epctrl & DXEPCTL_EPENA) && + dwc2_gadget_target_frame_elapsed(hs_ep)) { + epctrl |= DXEPCTL_SNAK; + epctrl |= DXEPCTL_EPDIS; + dwc2_writel(hsotg, epctrl, DIEPCTL(idx)); + } + } + + /* Clear interrupt */ + dwc2_writel(hsotg, GINTSTS_INCOMPL_SOIN, GINTSTS); +} + +/** + * dwc2_gadget_handle_incomplete_isoc_out - handle incomplete ISO OUT Interrupt + * @hsotg: The device state: + * + * This interrupt indicates one of the following conditions occurred while + * transmitting an ISOC transaction. + * - Corrupted OUT Token for ISOC EP. + * - Packet not complete in FIFO. + * + * The following actions will be taken: + * - Determine the EP + * - Set DCTL_SGOUTNAK and unmask GOUTNAKEFF if target frame elapsed. + */ +static void dwc2_gadget_handle_incomplete_isoc_out(struct dwc2_hsotg *hsotg) +{ + u32 gintsts; + u32 gintmsk; + u32 daintmsk; + u32 epctrl; + struct dwc2_hsotg_ep *hs_ep; + int idx; + + dev_dbg(hsotg->dev, "%s: GINTSTS_INCOMPL_SOOUT\n", __func__); + + daintmsk = dwc2_readl(hsotg, DAINTMSK); + daintmsk >>= DAINT_OUTEP_SHIFT; + + for (idx = 1; idx < hsotg->num_of_eps; idx++) { + hs_ep = hsotg->eps_out[idx]; + /* Proceed only unmasked ISOC EPs */ + if ((BIT(idx) & ~daintmsk) || !hs_ep->isochronous) + continue; + + epctrl = dwc2_readl(hsotg, DOEPCTL(idx)); + if ((epctrl & DXEPCTL_EPENA) && + dwc2_gadget_target_frame_elapsed(hs_ep)) { + /* Unmask GOUTNAKEFF interrupt */ + gintmsk = dwc2_readl(hsotg, GINTMSK); + gintmsk |= GINTSTS_GOUTNAKEFF; + dwc2_writel(hsotg, gintmsk, GINTMSK); + + gintsts = dwc2_readl(hsotg, GINTSTS); + if (!(gintsts & GINTSTS_GOUTNAKEFF)) { + dwc2_set_bit(hsotg, DCTL, DCTL_SGOUTNAK); + break; + } + } + } + + /* Clear interrupt */ + dwc2_writel(hsotg, GINTSTS_INCOMPL_SOOUT, GINTSTS); +} + +/** + * dwc2_hsotg_irq - handle device interrupt + * @irq: The IRQ number triggered + * @pw: The pw value when registered the handler. + */ +static irqreturn_t dwc2_hsotg_irq(int irq, void *pw) +{ + struct dwc2_hsotg *hsotg = pw; + int retry_count = 8; + u32 gintsts; + u32 gintmsk; + + if (!dwc2_is_device_mode(hsotg)) + return IRQ_NONE; + + spin_lock(&hsotg->lock); +irq_retry: + gintsts = dwc2_readl(hsotg, GINTSTS); + gintmsk = dwc2_readl(hsotg, GINTMSK); + + dev_dbg(hsotg->dev, "%s: %08x %08x (%08x) retry %d\n", + __func__, gintsts, gintsts & gintmsk, gintmsk, retry_count); + + gintsts &= gintmsk; + + if (gintsts & GINTSTS_RESETDET) { + dev_dbg(hsotg->dev, "%s: USBRstDet\n", __func__); + + dwc2_writel(hsotg, GINTSTS_RESETDET, GINTSTS); + + /* This event must be used only if controller is suspended */ + if (hsotg->in_ppd && hsotg->lx_state == DWC2_L2) + dwc2_exit_partial_power_down(hsotg, 0, true); + + hsotg->lx_state = DWC2_L0; + } + + if (gintsts & (GINTSTS_USBRST | GINTSTS_RESETDET)) { + u32 usb_status = dwc2_readl(hsotg, GOTGCTL); + u32 connected = hsotg->connected; + + dev_dbg(hsotg->dev, "%s: USBRst\n", __func__); + dev_dbg(hsotg->dev, "GNPTXSTS=%08x\n", + dwc2_readl(hsotg, GNPTXSTS)); + + dwc2_writel(hsotg, GINTSTS_USBRST, GINTSTS); + + /* Report disconnection if it is not already done. */ + dwc2_hsotg_disconnect(hsotg); + + /* Reset device address to zero */ + dwc2_clear_bit(hsotg, DCFG, DCFG_DEVADDR_MASK); + + if (usb_status & GOTGCTL_BSESVLD && connected) + dwc2_hsotg_core_init_disconnected(hsotg, true); + } + + if (gintsts & GINTSTS_ENUMDONE) { + dwc2_writel(hsotg, GINTSTS_ENUMDONE, GINTSTS); + + dwc2_hsotg_irq_enumdone(hsotg); + } + + if (gintsts & (GINTSTS_OEPINT | GINTSTS_IEPINT)) { + u32 daint = dwc2_readl(hsotg, DAINT); + u32 daintmsk = dwc2_readl(hsotg, DAINTMSK); + u32 daint_out, daint_in; + int ep; + + daint &= daintmsk; + daint_out = daint >> DAINT_OUTEP_SHIFT; + daint_in = daint & ~(daint_out << DAINT_OUTEP_SHIFT); + + dev_dbg(hsotg->dev, "%s: daint=%08x\n", __func__, daint); + + for (ep = 0; ep < hsotg->num_of_eps && daint_out; + ep++, daint_out >>= 1) { + if (daint_out & 1) + dwc2_hsotg_epint(hsotg, ep, 0); + } + + for (ep = 0; ep < hsotg->num_of_eps && daint_in; + ep++, daint_in >>= 1) { + if (daint_in & 1) + dwc2_hsotg_epint(hsotg, ep, 1); + } + } + + /* check both FIFOs */ + + if (gintsts & GINTSTS_NPTXFEMP) { + dev_dbg(hsotg->dev, "NPTxFEmp\n"); + + /* + * Disable the interrupt to stop it happening again + * unless one of these endpoint routines decides that + * it needs re-enabling + */ + + dwc2_hsotg_disable_gsint(hsotg, GINTSTS_NPTXFEMP); + dwc2_hsotg_irq_fifoempty(hsotg, false); + } + + if (gintsts & GINTSTS_PTXFEMP) { + dev_dbg(hsotg->dev, "PTxFEmp\n"); + + /* See note in GINTSTS_NPTxFEmp */ + + dwc2_hsotg_disable_gsint(hsotg, GINTSTS_PTXFEMP); + dwc2_hsotg_irq_fifoempty(hsotg, true); + } + + if (gintsts & GINTSTS_RXFLVL) { + /* + * note, since GINTSTS_RxFLvl doubles as FIFO-not-empty, + * we need to retry dwc2_hsotg_handle_rx if this is still + * set. + */ + + dwc2_hsotg_handle_rx(hsotg); + } + + if (gintsts & GINTSTS_ERLYSUSP) { + dev_dbg(hsotg->dev, "GINTSTS_ErlySusp\n"); + dwc2_writel(hsotg, GINTSTS_ERLYSUSP, GINTSTS); + } + + /* + * these next two seem to crop-up occasionally causing the core + * to shutdown the USB transfer, so try clearing them and logging + * the occurrence. + */ + + if (gintsts & GINTSTS_GOUTNAKEFF) { + u8 idx; + u32 epctrl; + u32 gintmsk; + u32 daintmsk; + struct dwc2_hsotg_ep *hs_ep; + + daintmsk = dwc2_readl(hsotg, DAINTMSK); + daintmsk >>= DAINT_OUTEP_SHIFT; + /* Mask this interrupt */ + gintmsk = dwc2_readl(hsotg, GINTMSK); + gintmsk &= ~GINTSTS_GOUTNAKEFF; + dwc2_writel(hsotg, gintmsk, GINTMSK); + + dev_dbg(hsotg->dev, "GOUTNakEff triggered\n"); + for (idx = 1; idx < hsotg->num_of_eps; idx++) { + hs_ep = hsotg->eps_out[idx]; + /* Proceed only unmasked ISOC EPs */ + if (BIT(idx) & ~daintmsk) + continue; + + epctrl = dwc2_readl(hsotg, DOEPCTL(idx)); + + //ISOC Ep's only + if ((epctrl & DXEPCTL_EPENA) && hs_ep->isochronous) { + epctrl |= DXEPCTL_SNAK; + epctrl |= DXEPCTL_EPDIS; + dwc2_writel(hsotg, epctrl, DOEPCTL(idx)); + continue; + } + + //Non-ISOC EP's + if (hs_ep->halted) { + if (!(epctrl & DXEPCTL_EPENA)) + epctrl |= DXEPCTL_EPENA; + epctrl |= DXEPCTL_EPDIS; + epctrl |= DXEPCTL_STALL; + dwc2_writel(hsotg, epctrl, DOEPCTL(idx)); + } + } + + /* This interrupt bit is cleared in DXEPINT_EPDISBLD handler */ + } + + if (gintsts & GINTSTS_GINNAKEFF) { + dev_info(hsotg->dev, "GINNakEff triggered\n"); + + dwc2_set_bit(hsotg, DCTL, DCTL_CGNPINNAK); + + dwc2_hsotg_dump(hsotg); + } + + if (gintsts & GINTSTS_INCOMPL_SOIN) + dwc2_gadget_handle_incomplete_isoc_in(hsotg); + + if (gintsts & GINTSTS_INCOMPL_SOOUT) + dwc2_gadget_handle_incomplete_isoc_out(hsotg); + + /* + * if we've had fifo events, we should try and go around the + * loop again to see if there's any point in returning yet. + */ + + if (gintsts & IRQ_RETRY_MASK && --retry_count > 0) + goto irq_retry; + + /* Check WKUP_ALERT interrupt*/ + if (hsotg->params.service_interval) + dwc2_gadget_wkup_alert_handler(hsotg); + + spin_unlock(&hsotg->lock); + + return IRQ_HANDLED; +} + +static void dwc2_hsotg_ep_stop_xfr(struct dwc2_hsotg *hsotg, + struct dwc2_hsotg_ep *hs_ep) +{ + u32 epctrl_reg; + u32 epint_reg; + + epctrl_reg = hs_ep->dir_in ? DIEPCTL(hs_ep->index) : + DOEPCTL(hs_ep->index); + epint_reg = hs_ep->dir_in ? DIEPINT(hs_ep->index) : + DOEPINT(hs_ep->index); + + dev_dbg(hsotg->dev, "%s: stopping transfer on %s\n", __func__, + hs_ep->name); + + if (hs_ep->dir_in) { + if (hsotg->dedicated_fifos || hs_ep->periodic) { + dwc2_set_bit(hsotg, epctrl_reg, DXEPCTL_SNAK); + /* Wait for Nak effect */ + if (dwc2_hsotg_wait_bit_set(hsotg, epint_reg, + DXEPINT_INEPNAKEFF, 100)) + dev_warn(hsotg->dev, + "%s: timeout DIEPINT.NAKEFF\n", + __func__); + } else { + dwc2_set_bit(hsotg, DCTL, DCTL_SGNPINNAK); + /* Wait for Nak effect */ + if (dwc2_hsotg_wait_bit_set(hsotg, GINTSTS, + GINTSTS_GINNAKEFF, 100)) + dev_warn(hsotg->dev, + "%s: timeout GINTSTS.GINNAKEFF\n", + __func__); + } + } else { + /* Mask GINTSTS_GOUTNAKEFF interrupt */ + dwc2_hsotg_disable_gsint(hsotg, GINTSTS_GOUTNAKEFF); + + if (!(dwc2_readl(hsotg, GINTSTS) & GINTSTS_GOUTNAKEFF)) + dwc2_set_bit(hsotg, DCTL, DCTL_SGOUTNAK); + + if (!using_dma(hsotg)) { + /* Wait for GINTSTS_RXFLVL interrupt */ + if (dwc2_hsotg_wait_bit_set(hsotg, GINTSTS, + GINTSTS_RXFLVL, 100)) { + dev_warn(hsotg->dev, "%s: timeout GINTSTS.RXFLVL\n", + __func__); + } else { + /* + * Pop GLOBAL OUT NAK status packet from RxFIFO + * to assert GOUTNAKEFF interrupt + */ + dwc2_readl(hsotg, GRXSTSP); + } + } + + /* Wait for global nak to take effect */ + if (dwc2_hsotg_wait_bit_set(hsotg, GINTSTS, + GINTSTS_GOUTNAKEFF, 100)) + dev_warn(hsotg->dev, "%s: timeout GINTSTS.GOUTNAKEFF\n", + __func__); + } + + /* Disable ep */ + dwc2_set_bit(hsotg, epctrl_reg, DXEPCTL_EPDIS | DXEPCTL_SNAK); + + /* Wait for ep to be disabled */ + if (dwc2_hsotg_wait_bit_set(hsotg, epint_reg, DXEPINT_EPDISBLD, 100)) + dev_warn(hsotg->dev, + "%s: timeout DOEPCTL.EPDisable\n", __func__); + + /* Clear EPDISBLD interrupt */ + dwc2_set_bit(hsotg, epint_reg, DXEPINT_EPDISBLD); + + if (hs_ep->dir_in) { + unsigned short fifo_index; + + if (hsotg->dedicated_fifos || hs_ep->periodic) + fifo_index = hs_ep->fifo_index; + else + fifo_index = 0; + + /* Flush TX FIFO */ + dwc2_flush_tx_fifo(hsotg, fifo_index); + + /* Clear Global In NP NAK in Shared FIFO for non periodic ep */ + if (!hsotg->dedicated_fifos && !hs_ep->periodic) + dwc2_set_bit(hsotg, DCTL, DCTL_CGNPINNAK); + + } else { + /* Remove global NAKs */ + dwc2_set_bit(hsotg, DCTL, DCTL_CGOUTNAK); + } +} + +/** + * dwc2_hsotg_ep_enable - enable the given endpoint + * @ep: The USB endpint to configure + * @desc: The USB endpoint descriptor to configure with. + * + * This is called from the USB gadget code's usb_ep_enable(). + */ +static int dwc2_hsotg_ep_enable(struct usb_ep *ep, + const struct usb_endpoint_descriptor *desc) +{ + struct dwc2_hsotg_ep *hs_ep = our_ep(ep); + struct dwc2_hsotg *hsotg = hs_ep->parent; + unsigned long flags; + unsigned int index = hs_ep->index; + u32 epctrl_reg; + u32 epctrl; + u32 mps; + u32 mc; + u32 mask; + unsigned int dir_in; + unsigned int i, val, size; + int ret = 0; + unsigned char ep_type; + int desc_num; + + dev_dbg(hsotg->dev, + "%s: ep %s: a 0x%02x, attr 0x%02x, mps 0x%04x, intr %d\n", + __func__, ep->name, desc->bEndpointAddress, desc->bmAttributes, + desc->wMaxPacketSize, desc->bInterval); + + /* not to be called for EP0 */ + if (index == 0) { + dev_err(hsotg->dev, "%s: called for EP 0\n", __func__); + return -EINVAL; + } + + dir_in = (desc->bEndpointAddress & USB_ENDPOINT_DIR_MASK) ? 1 : 0; + if (dir_in != hs_ep->dir_in) { + dev_err(hsotg->dev, "%s: direction mismatch!\n", __func__); + return -EINVAL; + } + + ep_type = desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK; + mps = usb_endpoint_maxp(desc); + mc = usb_endpoint_maxp_mult(desc); + + /* ISOC IN in DDMA supported bInterval up to 10 */ + if (using_desc_dma(hsotg) && ep_type == USB_ENDPOINT_XFER_ISOC && + dir_in && desc->bInterval > 10) { + dev_err(hsotg->dev, + "%s: ISOC IN, DDMA: bInterval>10 not supported!\n", __func__); + return -EINVAL; + } + + /* High bandwidth ISOC OUT in DDMA not supported */ + if (using_desc_dma(hsotg) && ep_type == USB_ENDPOINT_XFER_ISOC && + !dir_in && mc > 1) { + dev_err(hsotg->dev, + "%s: ISOC OUT, DDMA: HB not supported!\n", __func__); + return -EINVAL; + } + + /* note, we handle this here instead of dwc2_hsotg_set_ep_maxpacket */ + + epctrl_reg = dir_in ? DIEPCTL(index) : DOEPCTL(index); + epctrl = dwc2_readl(hsotg, epctrl_reg); + + dev_dbg(hsotg->dev, "%s: read DxEPCTL=0x%08x from 0x%08x\n", + __func__, epctrl, epctrl_reg); + + if (using_desc_dma(hsotg) && ep_type == USB_ENDPOINT_XFER_ISOC) + desc_num = MAX_DMA_DESC_NUM_HS_ISOC; + else + desc_num = MAX_DMA_DESC_NUM_GENERIC; + + /* Allocate DMA descriptor chain for non-ctrl endpoints */ + if (using_desc_dma(hsotg) && !hs_ep->desc_list) { + hs_ep->desc_list = dmam_alloc_coherent(hsotg->dev, + desc_num * sizeof(struct dwc2_dma_desc), + &hs_ep->desc_list_dma, GFP_ATOMIC); + if (!hs_ep->desc_list) { + ret = -ENOMEM; + goto error2; + } + } + + spin_lock_irqsave(&hsotg->lock, flags); + + epctrl &= ~(DXEPCTL_EPTYPE_MASK | DXEPCTL_MPS_MASK); + epctrl |= DXEPCTL_MPS(mps); + + /* + * mark the endpoint as active, otherwise the core may ignore + * transactions entirely for this endpoint + */ + epctrl |= DXEPCTL_USBACTEP; + + /* update the endpoint state */ + dwc2_hsotg_set_ep_maxpacket(hsotg, hs_ep->index, mps, mc, dir_in); + + /* default, set to non-periodic */ + hs_ep->isochronous = 0; + hs_ep->periodic = 0; + hs_ep->halted = 0; + hs_ep->wedged = 0; + hs_ep->interval = desc->bInterval; + + switch (ep_type) { + case USB_ENDPOINT_XFER_ISOC: + epctrl |= DXEPCTL_EPTYPE_ISO; + epctrl |= DXEPCTL_SETEVENFR; + hs_ep->isochronous = 1; + hs_ep->interval = 1 << (desc->bInterval - 1); + hs_ep->target_frame = TARGET_FRAME_INITIAL; + hs_ep->next_desc = 0; + hs_ep->compl_desc = 0; + if (dir_in) { + hs_ep->periodic = 1; + mask = dwc2_readl(hsotg, DIEPMSK); + mask |= DIEPMSK_NAKMSK; + dwc2_writel(hsotg, mask, DIEPMSK); + } else { + epctrl |= DXEPCTL_SNAK; + mask = dwc2_readl(hsotg, DOEPMSK); + mask |= DOEPMSK_OUTTKNEPDISMSK; + dwc2_writel(hsotg, mask, DOEPMSK); + } + break; + + case USB_ENDPOINT_XFER_BULK: + epctrl |= DXEPCTL_EPTYPE_BULK; + break; + + case USB_ENDPOINT_XFER_INT: + if (dir_in) + hs_ep->periodic = 1; + + if (hsotg->gadget.speed == USB_SPEED_HIGH) + hs_ep->interval = 1 << (desc->bInterval - 1); + + epctrl |= DXEPCTL_EPTYPE_INTERRUPT; + break; + + case USB_ENDPOINT_XFER_CONTROL: + epctrl |= DXEPCTL_EPTYPE_CONTROL; + break; + } + + /* + * if the hardware has dedicated fifos, we must give each IN EP + * a unique tx-fifo even if it is non-periodic. + */ + if (dir_in && hsotg->dedicated_fifos) { + unsigned fifo_count = dwc2_hsotg_tx_fifo_count(hsotg); + u32 fifo_index = 0; + u32 fifo_size = UINT_MAX; + + size = hs_ep->ep.maxpacket * hs_ep->mc; + for (i = 1; i <= fifo_count; ++i) { + if (hsotg->fifo_map & (1 << i)) + continue; + val = dwc2_readl(hsotg, DPTXFSIZN(i)); + val = (val >> FIFOSIZE_DEPTH_SHIFT) * 4; + if (val < size) + continue; + /* Search for smallest acceptable fifo */ + if (val < fifo_size) { + fifo_size = val; + fifo_index = i; + } + } + if (!fifo_index) { + dev_err(hsotg->dev, + "%s: No suitable fifo found\n", __func__); + ret = -ENOMEM; + goto error1; + } + epctrl &= ~(DXEPCTL_TXFNUM_LIMIT << DXEPCTL_TXFNUM_SHIFT); + hsotg->fifo_map |= 1 << fifo_index; + epctrl |= DXEPCTL_TXFNUM(fifo_index); + hs_ep->fifo_index = fifo_index; + hs_ep->fifo_size = fifo_size; + } + + /* for non control endpoints, set PID to D0 */ + if (index && !hs_ep->isochronous) + epctrl |= DXEPCTL_SETD0PID; + + /* WA for Full speed ISOC IN in DDMA mode. + * By Clear NAK status of EP, core will send ZLP + * to IN token and assert NAK interrupt relying + * on TxFIFO status only + */ + + if (hsotg->gadget.speed == USB_SPEED_FULL && + hs_ep->isochronous && dir_in) { + /* The WA applies only to core versions from 2.72a + * to 4.00a (including both). Also for FS_IOT_1.00a + * and HS_IOT_1.00a. + */ + u32 gsnpsid = dwc2_readl(hsotg, GSNPSID); + + if ((gsnpsid >= DWC2_CORE_REV_2_72a && + gsnpsid <= DWC2_CORE_REV_4_00a) || + gsnpsid == DWC2_FS_IOT_REV_1_00a || + gsnpsid == DWC2_HS_IOT_REV_1_00a) + epctrl |= DXEPCTL_CNAK; + } + + dev_dbg(hsotg->dev, "%s: write DxEPCTL=0x%08x\n", + __func__, epctrl); + + dwc2_writel(hsotg, epctrl, epctrl_reg); + dev_dbg(hsotg->dev, "%s: read DxEPCTL=0x%08x\n", + __func__, dwc2_readl(hsotg, epctrl_reg)); + + /* enable the endpoint interrupt */ + dwc2_hsotg_ctrl_epint(hsotg, index, dir_in, 1); + +error1: + spin_unlock_irqrestore(&hsotg->lock, flags); + +error2: + if (ret && using_desc_dma(hsotg) && hs_ep->desc_list) { + dmam_free_coherent(hsotg->dev, desc_num * + sizeof(struct dwc2_dma_desc), + hs_ep->desc_list, hs_ep->desc_list_dma); + hs_ep->desc_list = NULL; + } + + return ret; +} + +/** + * dwc2_hsotg_ep_disable - disable given endpoint + * @ep: The endpoint to disable. + */ +static int dwc2_hsotg_ep_disable(struct usb_ep *ep) +{ + struct dwc2_hsotg_ep *hs_ep = our_ep(ep); + struct dwc2_hsotg *hsotg = hs_ep->parent; + int dir_in = hs_ep->dir_in; + int index = hs_ep->index; + u32 epctrl_reg; + u32 ctrl; + + dev_dbg(hsotg->dev, "%s(ep %p)\n", __func__, ep); + + if (ep == &hsotg->eps_out[0]->ep) { + dev_err(hsotg->dev, "%s: called for ep0\n", __func__); + return -EINVAL; + } + + if (hsotg->op_state != OTG_STATE_B_PERIPHERAL) { + dev_err(hsotg->dev, "%s: called in host mode?\n", __func__); + return -EINVAL; + } + + epctrl_reg = dir_in ? DIEPCTL(index) : DOEPCTL(index); + + ctrl = dwc2_readl(hsotg, epctrl_reg); + + if (ctrl & DXEPCTL_EPENA) + dwc2_hsotg_ep_stop_xfr(hsotg, hs_ep); + + ctrl &= ~DXEPCTL_EPENA; + ctrl &= ~DXEPCTL_USBACTEP; + ctrl |= DXEPCTL_SNAK; + + dev_dbg(hsotg->dev, "%s: DxEPCTL=0x%08x\n", __func__, ctrl); + dwc2_writel(hsotg, ctrl, epctrl_reg); + + /* disable endpoint interrupts */ + dwc2_hsotg_ctrl_epint(hsotg, hs_ep->index, hs_ep->dir_in, 0); + + /* terminate all requests with shutdown */ + kill_all_requests(hsotg, hs_ep, -ESHUTDOWN); + + hsotg->fifo_map &= ~(1 << hs_ep->fifo_index); + hs_ep->fifo_index = 0; + hs_ep->fifo_size = 0; + + return 0; +} + +static int dwc2_hsotg_ep_disable_lock(struct usb_ep *ep) +{ + struct dwc2_hsotg_ep *hs_ep = our_ep(ep); + struct dwc2_hsotg *hsotg = hs_ep->parent; + unsigned long flags; + int ret; + + spin_lock_irqsave(&hsotg->lock, flags); + ret = dwc2_hsotg_ep_disable(ep); + spin_unlock_irqrestore(&hsotg->lock, flags); + return ret; +} + +/** + * on_list - check request is on the given endpoint + * @ep: The endpoint to check. + * @test: The request to test if it is on the endpoint. + */ +static bool on_list(struct dwc2_hsotg_ep *ep, struct dwc2_hsotg_req *test) +{ + struct dwc2_hsotg_req *req, *treq; + + list_for_each_entry_safe(req, treq, &ep->queue, queue) { + if (req == test) + return true; + } + + return false; +} + +/** + * dwc2_hsotg_ep_dequeue - dequeue given endpoint + * @ep: The endpoint to dequeue. + * @req: The request to be removed from a queue. + */ +static int dwc2_hsotg_ep_dequeue(struct usb_ep *ep, struct usb_request *req) +{ + struct dwc2_hsotg_req *hs_req = our_req(req); + struct dwc2_hsotg_ep *hs_ep = our_ep(ep); + struct dwc2_hsotg *hs = hs_ep->parent; + unsigned long flags; + + dev_dbg(hs->dev, "ep_dequeue(%p,%p)\n", ep, req); + + spin_lock_irqsave(&hs->lock, flags); + + if (!on_list(hs_ep, hs_req)) { + spin_unlock_irqrestore(&hs->lock, flags); + return -EINVAL; + } + + /* Dequeue already started request */ + if (req == &hs_ep->req->req) + dwc2_hsotg_ep_stop_xfr(hs, hs_ep); + + dwc2_hsotg_complete_request(hs, hs_ep, hs_req, -ECONNRESET); + spin_unlock_irqrestore(&hs->lock, flags); + + return 0; +} + +/** + * dwc2_gadget_ep_set_wedge - set wedge on a given endpoint + * @ep: The endpoint to be wedged. + * + */ +static int dwc2_gadget_ep_set_wedge(struct usb_ep *ep) +{ + struct dwc2_hsotg_ep *hs_ep = our_ep(ep); + struct dwc2_hsotg *hs = hs_ep->parent; + + unsigned long flags; + int ret; + + spin_lock_irqsave(&hs->lock, flags); + hs_ep->wedged = 1; + ret = dwc2_hsotg_ep_sethalt(ep, 1, false); + spin_unlock_irqrestore(&hs->lock, flags); + + return ret; +} + +/** + * dwc2_hsotg_ep_sethalt - set halt on a given endpoint + * @ep: The endpoint to set halt. + * @value: Set or unset the halt. + * @now: If true, stall the endpoint now. Otherwise return -EAGAIN if + * the endpoint is busy processing requests. + * + * We need to stall the endpoint immediately if request comes from set_feature + * protocol command handler. + */ +static int dwc2_hsotg_ep_sethalt(struct usb_ep *ep, int value, bool now) +{ + struct dwc2_hsotg_ep *hs_ep = our_ep(ep); + struct dwc2_hsotg *hs = hs_ep->parent; + int index = hs_ep->index; + u32 epreg; + u32 epctl; + u32 xfertype; + + dev_info(hs->dev, "%s(ep %p %s, %d)\n", __func__, ep, ep->name, value); + + if (index == 0) { + if (value) + dwc2_hsotg_stall_ep0(hs); + else + dev_warn(hs->dev, + "%s: can't clear halt on ep0\n", __func__); + return 0; + } + + if (hs_ep->isochronous) { + dev_err(hs->dev, "%s is Isochronous Endpoint\n", ep->name); + return -EINVAL; + } + + if (!now && value && !list_empty(&hs_ep->queue)) { + dev_dbg(hs->dev, "%s request is pending, cannot halt\n", + ep->name); + return -EAGAIN; + } + + if (hs_ep->dir_in) { + epreg = DIEPCTL(index); + epctl = dwc2_readl(hs, epreg); + + if (value) { + epctl |= DXEPCTL_STALL | DXEPCTL_SNAK; + if (epctl & DXEPCTL_EPENA) + epctl |= DXEPCTL_EPDIS; + } else { + epctl &= ~DXEPCTL_STALL; + hs_ep->wedged = 0; + xfertype = epctl & DXEPCTL_EPTYPE_MASK; + if (xfertype == DXEPCTL_EPTYPE_BULK || + xfertype == DXEPCTL_EPTYPE_INTERRUPT) + epctl |= DXEPCTL_SETD0PID; + } + dwc2_writel(hs, epctl, epreg); + } else { + epreg = DOEPCTL(index); + epctl = dwc2_readl(hs, epreg); + + if (value) { + /* Unmask GOUTNAKEFF interrupt */ + dwc2_hsotg_en_gsint(hs, GINTSTS_GOUTNAKEFF); + + if (!(dwc2_readl(hs, GINTSTS) & GINTSTS_GOUTNAKEFF)) + dwc2_set_bit(hs, DCTL, DCTL_SGOUTNAK); + // STALL bit will be set in GOUTNAKEFF interrupt handler + } else { + epctl &= ~DXEPCTL_STALL; + hs_ep->wedged = 0; + xfertype = epctl & DXEPCTL_EPTYPE_MASK; + if (xfertype == DXEPCTL_EPTYPE_BULK || + xfertype == DXEPCTL_EPTYPE_INTERRUPT) + epctl |= DXEPCTL_SETD0PID; + dwc2_writel(hs, epctl, epreg); + } + } + + hs_ep->halted = value; + return 0; +} + +/** + * dwc2_hsotg_ep_sethalt_lock - set halt on a given endpoint with lock held + * @ep: The endpoint to set halt. + * @value: Set or unset the halt. + */ +static int dwc2_hsotg_ep_sethalt_lock(struct usb_ep *ep, int value) +{ + struct dwc2_hsotg_ep *hs_ep = our_ep(ep); + struct dwc2_hsotg *hs = hs_ep->parent; + unsigned long flags; + int ret; + + spin_lock_irqsave(&hs->lock, flags); + ret = dwc2_hsotg_ep_sethalt(ep, value, false); + spin_unlock_irqrestore(&hs->lock, flags); + + return ret; +} + +static const struct usb_ep_ops dwc2_hsotg_ep_ops = { + .enable = dwc2_hsotg_ep_enable, + .disable = dwc2_hsotg_ep_disable_lock, + .alloc_request = dwc2_hsotg_ep_alloc_request, + .free_request = dwc2_hsotg_ep_free_request, + .queue = dwc2_hsotg_ep_queue_lock, + .dequeue = dwc2_hsotg_ep_dequeue, + .set_halt = dwc2_hsotg_ep_sethalt_lock, + .set_wedge = dwc2_gadget_ep_set_wedge, + /* note, don't believe we have any call for the fifo routines */ +}; + +/** + * dwc2_hsotg_init - initialize the usb core + * @hsotg: The driver state + */ +static void dwc2_hsotg_init(struct dwc2_hsotg *hsotg) +{ + /* unmask subset of endpoint interrupts */ + + dwc2_writel(hsotg, DIEPMSK_TIMEOUTMSK | DIEPMSK_AHBERRMSK | + DIEPMSK_EPDISBLDMSK | DIEPMSK_XFERCOMPLMSK, + DIEPMSK); + + dwc2_writel(hsotg, DOEPMSK_SETUPMSK | DOEPMSK_AHBERRMSK | + DOEPMSK_EPDISBLDMSK | DOEPMSK_XFERCOMPLMSK, + DOEPMSK); + + dwc2_writel(hsotg, 0, DAINTMSK); + + /* Be in disconnected state until gadget is registered */ + dwc2_set_bit(hsotg, DCTL, DCTL_SFTDISCON); + + /* setup fifos */ + + dev_dbg(hsotg->dev, "GRXFSIZ=0x%08x, GNPTXFSIZ=0x%08x\n", + dwc2_readl(hsotg, GRXFSIZ), + dwc2_readl(hsotg, GNPTXFSIZ)); + + dwc2_hsotg_init_fifo(hsotg); + + if (using_dma(hsotg)) + dwc2_set_bit(hsotg, GAHBCFG, GAHBCFG_DMA_EN); +} + +/** + * dwc2_hsotg_udc_start - prepare the udc for work + * @gadget: The usb gadget state + * @driver: The usb gadget driver + * + * Perform initialization to prepare udc device and driver + * to work. + */ +static int dwc2_hsotg_udc_start(struct usb_gadget *gadget, + struct usb_gadget_driver *driver) +{ + struct dwc2_hsotg *hsotg = to_hsotg(gadget); + unsigned long flags; + int ret; + + if (!hsotg) { + pr_err("%s: called with no device\n", __func__); + return -ENODEV; + } + + if (!driver) { + dev_err(hsotg->dev, "%s: no driver\n", __func__); + return -EINVAL; + } + + if (driver->max_speed < USB_SPEED_FULL) + dev_err(hsotg->dev, "%s: bad speed\n", __func__); + + if (!driver->setup) { + dev_err(hsotg->dev, "%s: missing entry points\n", __func__); + return -EINVAL; + } + + WARN_ON(hsotg->driver); + + hsotg->driver = driver; + hsotg->gadget.dev.of_node = hsotg->dev->of_node; + hsotg->gadget.speed = USB_SPEED_UNKNOWN; + + if (hsotg->dr_mode == USB_DR_MODE_PERIPHERAL) { + ret = dwc2_lowlevel_hw_enable(hsotg); + if (ret) + goto err; + } + + if (!IS_ERR_OR_NULL(hsotg->uphy)) + otg_set_peripheral(hsotg->uphy->otg, &hsotg->gadget); + + spin_lock_irqsave(&hsotg->lock, flags); + if (dwc2_hw_is_device(hsotg)) { + dwc2_hsotg_init(hsotg); + dwc2_hsotg_core_init_disconnected(hsotg, false); + } + + hsotg->enabled = 0; + spin_unlock_irqrestore(&hsotg->lock, flags); + + gadget->sg_supported = using_desc_dma(hsotg); + dev_info(hsotg->dev, "bound driver %s\n", driver->driver.name); + + return 0; + +err: + hsotg->driver = NULL; + return ret; +} + +/** + * dwc2_hsotg_udc_stop - stop the udc + * @gadget: The usb gadget state + * + * Stop udc hw block and stay tunned for future transmissions + */ +static int dwc2_hsotg_udc_stop(struct usb_gadget *gadget) +{ + struct dwc2_hsotg *hsotg = to_hsotg(gadget); + unsigned long flags; + int ep; + + if (!hsotg) + return -ENODEV; + + /* all endpoints should be shutdown */ + for (ep = 1; ep < hsotg->num_of_eps; ep++) { + if (hsotg->eps_in[ep]) + dwc2_hsotg_ep_disable_lock(&hsotg->eps_in[ep]->ep); + if (hsotg->eps_out[ep]) + dwc2_hsotg_ep_disable_lock(&hsotg->eps_out[ep]->ep); + } + + spin_lock_irqsave(&hsotg->lock, flags); + + hsotg->driver = NULL; + hsotg->gadget.speed = USB_SPEED_UNKNOWN; + hsotg->enabled = 0; + + spin_unlock_irqrestore(&hsotg->lock, flags); + + if (!IS_ERR_OR_NULL(hsotg->uphy)) + otg_set_peripheral(hsotg->uphy->otg, NULL); + + if (hsotg->dr_mode == USB_DR_MODE_PERIPHERAL) + dwc2_lowlevel_hw_disable(hsotg); + + return 0; +} + +/** + * dwc2_hsotg_gadget_getframe - read the frame number + * @gadget: The usb gadget state + * + * Read the {micro} frame number + */ +static int dwc2_hsotg_gadget_getframe(struct usb_gadget *gadget) +{ + return dwc2_hsotg_read_frameno(to_hsotg(gadget)); +} + +/** + * dwc2_hsotg_set_selfpowered - set if device is self/bus powered + * @gadget: The usb gadget state + * @is_selfpowered: Whether the device is self-powered + * + * Set if the device is self or bus powered. + */ +static int dwc2_hsotg_set_selfpowered(struct usb_gadget *gadget, + int is_selfpowered) +{ + struct dwc2_hsotg *hsotg = to_hsotg(gadget); + unsigned long flags; + + spin_lock_irqsave(&hsotg->lock, flags); + gadget->is_selfpowered = !!is_selfpowered; + spin_unlock_irqrestore(&hsotg->lock, flags); + + return 0; +} + +/** + * dwc2_hsotg_pullup - connect/disconnect the USB PHY + * @gadget: The usb gadget state + * @is_on: Current state of the USB PHY + * + * Connect/Disconnect the USB PHY pullup + */ +static int dwc2_hsotg_pullup(struct usb_gadget *gadget, int is_on) +{ + struct dwc2_hsotg *hsotg = to_hsotg(gadget); + unsigned long flags; + + dev_dbg(hsotg->dev, "%s: is_on: %d op_state: %d\n", __func__, is_on, + hsotg->op_state); + + /* Don't modify pullup state while in host mode */ + if (hsotg->op_state != OTG_STATE_B_PERIPHERAL) { + hsotg->enabled = is_on; + return 0; + } + + spin_lock_irqsave(&hsotg->lock, flags); + if (is_on) { + hsotg->enabled = 1; + dwc2_hsotg_core_init_disconnected(hsotg, false); + /* Enable ACG feature in device mode,if supported */ + dwc2_enable_acg(hsotg); + dwc2_hsotg_core_connect(hsotg); + } else { + dwc2_hsotg_core_disconnect(hsotg); + dwc2_hsotg_disconnect(hsotg); + hsotg->enabled = 0; + } + + hsotg->gadget.speed = USB_SPEED_UNKNOWN; + spin_unlock_irqrestore(&hsotg->lock, flags); + + return 0; +} + +static int dwc2_hsotg_vbus_session(struct usb_gadget *gadget, int is_active) +{ + struct dwc2_hsotg *hsotg = to_hsotg(gadget); + unsigned long flags; + + dev_dbg(hsotg->dev, "%s: is_active: %d\n", __func__, is_active); + spin_lock_irqsave(&hsotg->lock, flags); + + /* + * If controller is in partial power down state, it must exit from + * that state before being initialized / de-initialized + */ + if (hsotg->lx_state == DWC2_L2 && hsotg->in_ppd) + /* + * No need to check the return value as + * registers are not being restored. + */ + dwc2_exit_partial_power_down(hsotg, 0, false); + + if (is_active) { + hsotg->op_state = OTG_STATE_B_PERIPHERAL; + + dwc2_hsotg_core_init_disconnected(hsotg, false); + if (hsotg->enabled) { + /* Enable ACG feature in device mode,if supported */ + dwc2_enable_acg(hsotg); + dwc2_hsotg_core_connect(hsotg); + } + } else { + dwc2_hsotg_core_disconnect(hsotg); + dwc2_hsotg_disconnect(hsotg); + } + + spin_unlock_irqrestore(&hsotg->lock, flags); + return 0; +} + +/** + * dwc2_hsotg_vbus_draw - report bMaxPower field + * @gadget: The usb gadget state + * @mA: Amount of current + * + * Report how much power the device may consume to the phy. + */ +static int dwc2_hsotg_vbus_draw(struct usb_gadget *gadget, unsigned int mA) +{ + struct dwc2_hsotg *hsotg = to_hsotg(gadget); + + if (IS_ERR_OR_NULL(hsotg->uphy)) + return -ENOTSUPP; + return usb_phy_set_power(hsotg->uphy, mA); +} + +static void dwc2_gadget_set_speed(struct usb_gadget *g, enum usb_device_speed speed) +{ + struct dwc2_hsotg *hsotg = to_hsotg(g); + unsigned long flags; + + spin_lock_irqsave(&hsotg->lock, flags); + switch (speed) { + case USB_SPEED_HIGH: + hsotg->params.speed = DWC2_SPEED_PARAM_HIGH; + break; + case USB_SPEED_FULL: + hsotg->params.speed = DWC2_SPEED_PARAM_FULL; + break; + case USB_SPEED_LOW: + hsotg->params.speed = DWC2_SPEED_PARAM_LOW; + break; + default: + dev_err(hsotg->dev, "invalid speed (%d)\n", speed); + } + spin_unlock_irqrestore(&hsotg->lock, flags); +} + +static const struct usb_gadget_ops dwc2_hsotg_gadget_ops = { + .get_frame = dwc2_hsotg_gadget_getframe, + .set_selfpowered = dwc2_hsotg_set_selfpowered, + .udc_start = dwc2_hsotg_udc_start, + .udc_stop = dwc2_hsotg_udc_stop, + .pullup = dwc2_hsotg_pullup, + .udc_set_speed = dwc2_gadget_set_speed, + .vbus_session = dwc2_hsotg_vbus_session, + .vbus_draw = dwc2_hsotg_vbus_draw, +}; + +/** + * dwc2_hsotg_initep - initialise a single endpoint + * @hsotg: The device state. + * @hs_ep: The endpoint to be initialised. + * @epnum: The endpoint number + * @dir_in: True if direction is in. + * + * Initialise the given endpoint (as part of the probe and device state + * creation) to give to the gadget driver. Setup the endpoint name, any + * direction information and other state that may be required. + */ +static void dwc2_hsotg_initep(struct dwc2_hsotg *hsotg, + struct dwc2_hsotg_ep *hs_ep, + int epnum, + bool dir_in) +{ + char *dir; + + if (epnum == 0) + dir = ""; + else if (dir_in) + dir = "in"; + else + dir = "out"; + + hs_ep->dir_in = dir_in; + hs_ep->index = epnum; + + snprintf(hs_ep->name, sizeof(hs_ep->name), "ep%d%s", epnum, dir); + + INIT_LIST_HEAD(&hs_ep->queue); + INIT_LIST_HEAD(&hs_ep->ep.ep_list); + + /* add to the list of endpoints known by the gadget driver */ + if (epnum) + list_add_tail(&hs_ep->ep.ep_list, &hsotg->gadget.ep_list); + + hs_ep->parent = hsotg; + hs_ep->ep.name = hs_ep->name; + + if (hsotg->params.speed == DWC2_SPEED_PARAM_LOW) + usb_ep_set_maxpacket_limit(&hs_ep->ep, 8); + else + usb_ep_set_maxpacket_limit(&hs_ep->ep, + epnum ? 1024 : EP0_MPS_LIMIT); + hs_ep->ep.ops = &dwc2_hsotg_ep_ops; + + if (epnum == 0) { + hs_ep->ep.caps.type_control = true; + } else { + if (hsotg->params.speed != DWC2_SPEED_PARAM_LOW) { + hs_ep->ep.caps.type_iso = true; + hs_ep->ep.caps.type_bulk = true; + } + hs_ep->ep.caps.type_int = true; + } + + if (dir_in) + hs_ep->ep.caps.dir_in = true; + else + hs_ep->ep.caps.dir_out = true; + + /* + * if we're using dma, we need to set the next-endpoint pointer + * to be something valid. + */ + + if (using_dma(hsotg)) { + u32 next = DXEPCTL_NEXTEP((epnum + 1) % 15); + + if (dir_in) + dwc2_writel(hsotg, next, DIEPCTL(epnum)); + else + dwc2_writel(hsotg, next, DOEPCTL(epnum)); + } +} + +/** + * dwc2_hsotg_hw_cfg - read HW configuration registers + * @hsotg: Programming view of the DWC_otg controller + * + * Read the USB core HW configuration registers + */ +static int dwc2_hsotg_hw_cfg(struct dwc2_hsotg *hsotg) +{ + u32 cfg; + u32 ep_type; + u32 i; + + /* check hardware configuration */ + + hsotg->num_of_eps = hsotg->hw_params.num_dev_ep; + + /* Add ep0 */ + hsotg->num_of_eps++; + + hsotg->eps_in[0] = devm_kzalloc(hsotg->dev, + sizeof(struct dwc2_hsotg_ep), + GFP_KERNEL); + if (!hsotg->eps_in[0]) + return -ENOMEM; + /* Same dwc2_hsotg_ep is used in both directions for ep0 */ + hsotg->eps_out[0] = hsotg->eps_in[0]; + + cfg = hsotg->hw_params.dev_ep_dirs; + for (i = 1, cfg >>= 2; i < hsotg->num_of_eps; i++, cfg >>= 2) { + ep_type = cfg & 3; + /* Direction in or both */ + if (!(ep_type & 2)) { + hsotg->eps_in[i] = devm_kzalloc(hsotg->dev, + sizeof(struct dwc2_hsotg_ep), GFP_KERNEL); + if (!hsotg->eps_in[i]) + return -ENOMEM; + } + /* Direction out or both */ + if (!(ep_type & 1)) { + hsotg->eps_out[i] = devm_kzalloc(hsotg->dev, + sizeof(struct dwc2_hsotg_ep), GFP_KERNEL); + if (!hsotg->eps_out[i]) + return -ENOMEM; + } + } + + hsotg->fifo_mem = hsotg->hw_params.total_fifo_size; + hsotg->dedicated_fifos = hsotg->hw_params.en_multiple_tx_fifo; + + dev_info(hsotg->dev, "EPs: %d, %s fifos, %d entries in SPRAM\n", + hsotg->num_of_eps, + hsotg->dedicated_fifos ? "dedicated" : "shared", + hsotg->fifo_mem); + return 0; +} + +/** + * dwc2_hsotg_dump - dump state of the udc + * @hsotg: Programming view of the DWC_otg controller + * + */ +static void dwc2_hsotg_dump(struct dwc2_hsotg *hsotg) +{ +#ifdef DEBUG + struct device *dev = hsotg->dev; + u32 val; + int idx; + + dev_info(dev, "DCFG=0x%08x, DCTL=0x%08x, DIEPMSK=%08x\n", + dwc2_readl(hsotg, DCFG), dwc2_readl(hsotg, DCTL), + dwc2_readl(hsotg, DIEPMSK)); + + dev_info(dev, "GAHBCFG=0x%08x, GHWCFG1=0x%08x\n", + dwc2_readl(hsotg, GAHBCFG), dwc2_readl(hsotg, GHWCFG1)); + + dev_info(dev, "GRXFSIZ=0x%08x, GNPTXFSIZ=0x%08x\n", + dwc2_readl(hsotg, GRXFSIZ), dwc2_readl(hsotg, GNPTXFSIZ)); + + /* show periodic fifo settings */ + + for (idx = 1; idx < hsotg->num_of_eps; idx++) { + val = dwc2_readl(hsotg, DPTXFSIZN(idx)); + dev_info(dev, "DPTx[%d] FSize=%d, StAddr=0x%08x\n", idx, + val >> FIFOSIZE_DEPTH_SHIFT, + val & FIFOSIZE_STARTADDR_MASK); + } + + for (idx = 0; idx < hsotg->num_of_eps; idx++) { + dev_info(dev, + "ep%d-in: EPCTL=0x%08x, SIZ=0x%08x, DMA=0x%08x\n", idx, + dwc2_readl(hsotg, DIEPCTL(idx)), + dwc2_readl(hsotg, DIEPTSIZ(idx)), + dwc2_readl(hsotg, DIEPDMA(idx))); + + val = dwc2_readl(hsotg, DOEPCTL(idx)); + dev_info(dev, + "ep%d-out: EPCTL=0x%08x, SIZ=0x%08x, DMA=0x%08x\n", + idx, dwc2_readl(hsotg, DOEPCTL(idx)), + dwc2_readl(hsotg, DOEPTSIZ(idx)), + dwc2_readl(hsotg, DOEPDMA(idx))); + } + + dev_info(dev, "DVBUSDIS=0x%08x, DVBUSPULSE=%08x\n", + dwc2_readl(hsotg, DVBUSDIS), dwc2_readl(hsotg, DVBUSPULSE)); +#endif +} + +/** + * dwc2_gadget_init - init function for gadget + * @hsotg: Programming view of the DWC_otg controller + * + */ +int dwc2_gadget_init(struct dwc2_hsotg *hsotg) +{ + struct device *dev = hsotg->dev; + int epnum; + int ret; + + /* Dump fifo information */ + dev_dbg(dev, "NonPeriodic TXFIFO size: %d\n", + hsotg->params.g_np_tx_fifo_size); + dev_dbg(dev, "RXFIFO size: %d\n", hsotg->params.g_rx_fifo_size); + + switch (hsotg->params.speed) { + case DWC2_SPEED_PARAM_LOW: + hsotg->gadget.max_speed = USB_SPEED_LOW; + break; + case DWC2_SPEED_PARAM_FULL: + hsotg->gadget.max_speed = USB_SPEED_FULL; + break; + default: + hsotg->gadget.max_speed = USB_SPEED_HIGH; + break; + } + + hsotg->gadget.ops = &dwc2_hsotg_gadget_ops; + hsotg->gadget.name = dev_name(dev); + hsotg->gadget.otg_caps = &hsotg->params.otg_caps; + hsotg->remote_wakeup_allowed = 0; + + if (hsotg->params.lpm) + hsotg->gadget.lpm_capable = true; + + if (hsotg->dr_mode == USB_DR_MODE_OTG) + hsotg->gadget.is_otg = 1; + else if (hsotg->dr_mode == USB_DR_MODE_PERIPHERAL) + hsotg->op_state = OTG_STATE_B_PERIPHERAL; + + ret = dwc2_hsotg_hw_cfg(hsotg); + if (ret) { + dev_err(hsotg->dev, "Hardware configuration failed: %d\n", ret); + return ret; + } + + hsotg->ctrl_buff = devm_kzalloc(hsotg->dev, + DWC2_CTRL_BUFF_SIZE, GFP_KERNEL); + if (!hsotg->ctrl_buff) + return -ENOMEM; + + hsotg->ep0_buff = devm_kzalloc(hsotg->dev, + DWC2_CTRL_BUFF_SIZE, GFP_KERNEL); + if (!hsotg->ep0_buff) + return -ENOMEM; + + if (using_desc_dma(hsotg)) { + ret = dwc2_gadget_alloc_ctrl_desc_chains(hsotg); + if (ret < 0) + return ret; + } + + ret = devm_request_irq(hsotg->dev, hsotg->irq, dwc2_hsotg_irq, + IRQF_SHARED, dev_name(hsotg->dev), hsotg); + if (ret < 0) { + dev_err(dev, "cannot claim IRQ for gadget\n"); + return ret; + } + + /* hsotg->num_of_eps holds number of EPs other than ep0 */ + + if (hsotg->num_of_eps == 0) { + dev_err(dev, "wrong number of EPs (zero)\n"); + return -EINVAL; + } + + /* setup endpoint information */ + + INIT_LIST_HEAD(&hsotg->gadget.ep_list); + hsotg->gadget.ep0 = &hsotg->eps_out[0]->ep; + + /* allocate EP0 request */ + + hsotg->ctrl_req = dwc2_hsotg_ep_alloc_request(&hsotg->eps_out[0]->ep, + GFP_KERNEL); + if (!hsotg->ctrl_req) { + dev_err(dev, "failed to allocate ctrl req\n"); + return -ENOMEM; + } + + /* initialise the endpoints now the core has been initialised */ + for (epnum = 0; epnum < hsotg->num_of_eps; epnum++) { + if (hsotg->eps_in[epnum]) + dwc2_hsotg_initep(hsotg, hsotg->eps_in[epnum], + epnum, 1); + if (hsotg->eps_out[epnum]) + dwc2_hsotg_initep(hsotg, hsotg->eps_out[epnum], + epnum, 0); + } + + dwc2_hsotg_dump(hsotg); + + return 0; +} + +/** + * dwc2_hsotg_remove - remove function for hsotg driver + * @hsotg: Programming view of the DWC_otg controller + * + */ +int dwc2_hsotg_remove(struct dwc2_hsotg *hsotg) +{ + usb_del_gadget_udc(&hsotg->gadget); + dwc2_hsotg_ep_free_request(&hsotg->eps_out[0]->ep, hsotg->ctrl_req); + + return 0; +} + +int dwc2_hsotg_suspend(struct dwc2_hsotg *hsotg) +{ + unsigned long flags; + + if (hsotg->lx_state != DWC2_L0) + return 0; + + if (hsotg->driver) { + int ep; + + dev_info(hsotg->dev, "suspending usb gadget %s\n", + hsotg->driver->driver.name); + + spin_lock_irqsave(&hsotg->lock, flags); + if (hsotg->enabled) + dwc2_hsotg_core_disconnect(hsotg); + dwc2_hsotg_disconnect(hsotg); + hsotg->gadget.speed = USB_SPEED_UNKNOWN; + spin_unlock_irqrestore(&hsotg->lock, flags); + + for (ep = 1; ep < hsotg->num_of_eps; ep++) { + if (hsotg->eps_in[ep]) + dwc2_hsotg_ep_disable_lock(&hsotg->eps_in[ep]->ep); + if (hsotg->eps_out[ep]) + dwc2_hsotg_ep_disable_lock(&hsotg->eps_out[ep]->ep); + } + } + + return 0; +} + +int dwc2_hsotg_resume(struct dwc2_hsotg *hsotg) +{ + unsigned long flags; + + if (hsotg->lx_state == DWC2_L2) + return 0; + + if (hsotg->driver) { + dev_info(hsotg->dev, "resuming usb gadget %s\n", + hsotg->driver->driver.name); + + spin_lock_irqsave(&hsotg->lock, flags); + dwc2_hsotg_core_init_disconnected(hsotg, false); + if (hsotg->enabled) { + /* Enable ACG feature in device mode,if supported */ + dwc2_enable_acg(hsotg); + dwc2_hsotg_core_connect(hsotg); + } + spin_unlock_irqrestore(&hsotg->lock, flags); + } + + return 0; +} + +/** + * dwc2_backup_device_registers() - Backup controller device 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_device_registers(struct dwc2_hsotg *hsotg) +{ + struct dwc2_dregs_backup *dr; + int i; + + dev_dbg(hsotg->dev, "%s\n", __func__); + + /* Backup dev regs */ + dr = &hsotg->dr_backup; + + dr->dcfg = dwc2_readl(hsotg, DCFG); + dr->dctl = dwc2_readl(hsotg, DCTL); + dr->daintmsk = dwc2_readl(hsotg, DAINTMSK); + dr->diepmsk = dwc2_readl(hsotg, DIEPMSK); + dr->doepmsk = dwc2_readl(hsotg, DOEPMSK); + + for (i = 0; i < hsotg->num_of_eps; i++) { + /* Backup IN EPs */ + dr->diepctl[i] = dwc2_readl(hsotg, DIEPCTL(i)); + + /* Ensure DATA PID is correctly configured */ + if (dr->diepctl[i] & DXEPCTL_DPID) + dr->diepctl[i] |= DXEPCTL_SETD1PID; + else + dr->diepctl[i] |= DXEPCTL_SETD0PID; + + dr->dieptsiz[i] = dwc2_readl(hsotg, DIEPTSIZ(i)); + dr->diepdma[i] = dwc2_readl(hsotg, DIEPDMA(i)); + + /* Backup OUT EPs */ + dr->doepctl[i] = dwc2_readl(hsotg, DOEPCTL(i)); + + /* Ensure DATA PID is correctly configured */ + if (dr->doepctl[i] & DXEPCTL_DPID) + dr->doepctl[i] |= DXEPCTL_SETD1PID; + else + dr->doepctl[i] |= DXEPCTL_SETD0PID; + + dr->doeptsiz[i] = dwc2_readl(hsotg, DOEPTSIZ(i)); + dr->doepdma[i] = dwc2_readl(hsotg, DOEPDMA(i)); + dr->dtxfsiz[i] = dwc2_readl(hsotg, DPTXFSIZN(i)); + } + dr->valid = true; + return 0; +} + +/** + * dwc2_restore_device_registers() - Restore controller device registers. + * When resuming usb bus, device registers needs to be restored + * if controller power were disabled. + * + * @hsotg: Programming view of the DWC_otg controller + * @remote_wakeup: Indicates whether resume is initiated by Device or Host. + * + * Return: 0 if successful, negative error code otherwise + */ +int dwc2_restore_device_registers(struct dwc2_hsotg *hsotg, int remote_wakeup) +{ + struct dwc2_dregs_backup *dr; + int i; + + dev_dbg(hsotg->dev, "%s\n", __func__); + + /* Restore dev regs */ + dr = &hsotg->dr_backup; + if (!dr->valid) { + dev_err(hsotg->dev, "%s: no device registers to restore\n", + __func__); + return -EINVAL; + } + dr->valid = false; + + if (!remote_wakeup) + dwc2_writel(hsotg, dr->dctl, DCTL); + + dwc2_writel(hsotg, dr->daintmsk, DAINTMSK); + dwc2_writel(hsotg, dr->diepmsk, DIEPMSK); + dwc2_writel(hsotg, dr->doepmsk, DOEPMSK); + + for (i = 0; i < hsotg->num_of_eps; i++) { + /* Restore IN EPs */ + dwc2_writel(hsotg, dr->dieptsiz[i], DIEPTSIZ(i)); + dwc2_writel(hsotg, dr->diepdma[i], DIEPDMA(i)); + dwc2_writel(hsotg, dr->doeptsiz[i], DOEPTSIZ(i)); + /** WA for enabled EPx's IN in DDMA mode. On entering to + * hibernation wrong value read and saved from DIEPDMAx, + * as result BNA interrupt asserted on hibernation exit + * by restoring from saved area. + */ + if (using_desc_dma(hsotg) && + (dr->diepctl[i] & DXEPCTL_EPENA)) + dr->diepdma[i] = hsotg->eps_in[i]->desc_list_dma; + dwc2_writel(hsotg, dr->dtxfsiz[i], DPTXFSIZN(i)); + dwc2_writel(hsotg, dr->diepctl[i], DIEPCTL(i)); + /* Restore OUT EPs */ + dwc2_writel(hsotg, dr->doeptsiz[i], DOEPTSIZ(i)); + /* WA for enabled EPx's OUT in DDMA mode. On entering to + * hibernation wrong value read and saved from DOEPDMAx, + * as result BNA interrupt asserted on hibernation exit + * by restoring from saved area. + */ + if (using_desc_dma(hsotg) && + (dr->doepctl[i] & DXEPCTL_EPENA)) + dr->doepdma[i] = hsotg->eps_out[i]->desc_list_dma; + dwc2_writel(hsotg, dr->doepdma[i], DOEPDMA(i)); + dwc2_writel(hsotg, dr->doepctl[i], DOEPCTL(i)); + } + + return 0; +} + +/** + * dwc2_gadget_init_lpm - Configure the core to support LPM in device mode + * + * @hsotg: Programming view of DWC_otg controller + * + */ +void dwc2_gadget_init_lpm(struct dwc2_hsotg *hsotg) +{ + u32 val; + + if (!hsotg->params.lpm) + return; + + val = GLPMCFG_LPMCAP | GLPMCFG_APPL1RES; + val |= hsotg->params.hird_threshold_en ? GLPMCFG_HIRD_THRES_EN : 0; + val |= hsotg->params.lpm_clock_gating ? GLPMCFG_ENBLSLPM : 0; + val |= hsotg->params.hird_threshold << GLPMCFG_HIRD_THRES_SHIFT; + val |= hsotg->params.besl ? GLPMCFG_ENBESL : 0; + val |= GLPMCFG_LPM_REJECT_CTRL_CONTROL; + val |= GLPMCFG_LPM_ACCEPT_CTRL_ISOC; + dwc2_writel(hsotg, val, GLPMCFG); + dev_dbg(hsotg->dev, "GLPMCFG=0x%08x\n", dwc2_readl(hsotg, GLPMCFG)); + + /* Unmask WKUP_ALERT Interrupt */ + if (hsotg->params.service_interval) + dwc2_set_bit(hsotg, GINTMSK2, GINTMSK2_WKUP_ALERT_INT_MSK); +} + +/** + * dwc2_gadget_program_ref_clk - Program GREFCLK register in device mode + * + * @hsotg: Programming view of DWC_otg controller + * + */ +void dwc2_gadget_program_ref_clk(struct dwc2_hsotg *hsotg) +{ + u32 val = 0; + + val |= GREFCLK_REF_CLK_MODE; + val |= hsotg->params.ref_clk_per << GREFCLK_REFCLKPER_SHIFT; + val |= hsotg->params.sof_cnt_wkup_alert << + GREFCLK_SOF_CNT_WKUP_ALERT_SHIFT; + + dwc2_writel(hsotg, val, GREFCLK); + dev_dbg(hsotg->dev, "GREFCLK=0x%08x\n", dwc2_readl(hsotg, GREFCLK)); +} + +/** + * dwc2_gadget_enter_hibernation() - Put controller in Hibernation. + * + * @hsotg: Programming view of the DWC_otg controller + * + * Return non-zero if failed to enter to hibernation. + */ +int dwc2_gadget_enter_hibernation(struct dwc2_hsotg *hsotg) +{ + u32 gpwrdn; + int ret = 0; + + /* Change to L2(suspend) state */ + hsotg->lx_state = DWC2_L2; + dev_dbg(hsotg->dev, "Start of hibernation completed\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_device_registers(hsotg); + if (ret) { + dev_err(hsotg->dev, "%s: failed to backup device registers\n", + __func__); + return ret; + } + + gpwrdn = GPWRDN_PWRDNRSTN; + gpwrdn |= GPWRDN_PMUACTV; + dwc2_writel(hsotg, gpwrdn, GPWRDN); + udelay(10); + + /* Set flag to indicate that we are in hibernation */ + hsotg->hibernated = 1; + + /* Enable interrupts from wake up logic */ + gpwrdn = dwc2_readl(hsotg, GPWRDN); + gpwrdn |= GPWRDN_PMUINTSEL; + dwc2_writel(hsotg, gpwrdn, GPWRDN); + udelay(10); + + /* Unmask device mode interrupts in GPWRDN */ + gpwrdn = dwc2_readl(hsotg, GPWRDN); + gpwrdn |= GPWRDN_RST_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); + udelay(10); + + /* Save gpwrdn register for further usage if stschng interrupt */ + hsotg->gr_backup.gpwrdn = dwc2_readl(hsotg, GPWRDN); + dev_dbg(hsotg->dev, "Hibernation completed\n"); + + return ret; +} + +/** + * dwc2_gadget_exit_hibernation() + * This function is for exiting from Device mode hibernation by host initiated + * resume/reset and device initiated remote-wakeup. + * + * @hsotg: Programming view of the DWC_otg controller + * @rem_wakeup: indicates whether resume is initiated by Device or Host. + * @reset: indicates whether resume is initiated by Reset. + * + * Return non-zero if failed to exit from hibernation. + */ +int dwc2_gadget_exit_hibernation(struct dwc2_hsotg *hsotg, + int rem_wakeup, int reset) +{ + u32 pcgcctl; + u32 gpwrdn; + u32 dctl; + int ret = 0; + struct dwc2_gregs_backup *gr; + struct dwc2_dregs_backup *dr; + + gr = &hsotg->gr_backup; + dr = &hsotg->dr_backup; + + if (!hsotg->hibernated) { + dev_dbg(hsotg->dev, "Already exited from Hibernation\n"); + return 1; + } + dev_dbg(hsotg->dev, + "%s: called with rem_wakeup = %d reset = %d\n", + __func__, rem_wakeup, reset); + + dwc2_hib_restore_common(hsotg, rem_wakeup, 0); + + if (!reset) { + /* 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); + + if (!rem_wakeup) { + pcgcctl = dwc2_readl(hsotg, PCGCTL); + pcgcctl &= ~PCGCTL_RSTPDWNMODULE; + dwc2_writel(hsotg, pcgcctl, PCGCTL); + } + + /* Restore GUSBCFG, DCFG and DCTL */ + dwc2_writel(hsotg, gr->gusbcfg, GUSBCFG); + dwc2_writel(hsotg, dr->dcfg, DCFG); + dwc2_writel(hsotg, dr->dctl, DCTL); + + /* On USB Reset, reset device address to zero */ + if (reset) + dwc2_clear_bit(hsotg, DCFG, DCFG_DEVADDR_MASK); + + /* De-assert Wakeup Logic */ + gpwrdn = dwc2_readl(hsotg, GPWRDN); + gpwrdn &= ~GPWRDN_PMUACTV; + dwc2_writel(hsotg, gpwrdn, GPWRDN); + + if (rem_wakeup) { + udelay(10); + /* Start Remote Wakeup Signaling */ + dwc2_writel(hsotg, dr->dctl | DCTL_RMTWKUPSIG, DCTL); + } else { + udelay(50); + /* Set Device programming done bit */ + dctl = dwc2_readl(hsotg, DCTL); + dctl |= DCTL_PWRONPRGDONE; + dwc2_writel(hsotg, dctl, DCTL); + } + /* Wait for interrupts which must be cleared */ + mdelay(2); + /* 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 device registers */ + ret = dwc2_restore_device_registers(hsotg, rem_wakeup); + if (ret) { + dev_err(hsotg->dev, "%s: failed to restore device registers\n", + __func__); + return ret; + } + + if (rem_wakeup) { + mdelay(10); + dctl = dwc2_readl(hsotg, DCTL); + dctl &= ~DCTL_RMTWKUPSIG; + dwc2_writel(hsotg, dctl, DCTL); + } + + hsotg->hibernated = 0; + hsotg->lx_state = DWC2_L0; + dev_dbg(hsotg->dev, "Hibernation recovery completes here\n"); + + return ret; +} + +/** + * dwc2_gadget_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 device partial power down. + * + * This function is for entering device mode partial power down. + */ +int dwc2_gadget_enter_partial_power_down(struct dwc2_hsotg *hsotg) +{ + u32 pcgcctl; + int ret = 0; + + dev_dbg(hsotg->dev, "Entering device partial power down started.\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_device_registers(hsotg); + if (ret) { + dev_err(hsotg->dev, "%s: failed to backup device 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; + + dev_dbg(hsotg->dev, "Entering device partial power down completed.\n"); + + return ret; +} + +/* + * dwc2_gadget_exit_partial_power_down() - Exit controller from device partial + * power down. + * + * @hsotg: Programming view of the DWC_otg controller + * @restore: indicates whether need to restore the registers or not. + * + * Return: non-zero if failed to exit device partial power down. + * + * This function is for exiting from device mode partial power down. + */ +int dwc2_gadget_exit_partial_power_down(struct dwc2_hsotg *hsotg, + bool restore) +{ + u32 pcgcctl; + u32 dctl; + struct dwc2_dregs_backup *dr; + int ret = 0; + + dr = &hsotg->dr_backup; + + dev_dbg(hsotg->dev, "Exiting device partial Power Down started.\n"); + + pcgcctl = dwc2_readl(hsotg, PCGCTL); + pcgcctl &= ~PCGCTL_STOPPCLK; + dwc2_writel(hsotg, pcgcctl, PCGCTL); + + pcgcctl = dwc2_readl(hsotg, PCGCTL); + pcgcctl &= ~PCGCTL_PWRCLMP; + dwc2_writel(hsotg, pcgcctl, PCGCTL); + + 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; + } + /* Restore DCFG */ + dwc2_writel(hsotg, dr->dcfg, DCFG); + + ret = dwc2_restore_device_registers(hsotg, 0); + if (ret) { + dev_err(hsotg->dev, "%s: failed to restore device registers\n", + __func__); + return ret; + } + } + + /* Set the Power-On Programming done bit */ + dctl = dwc2_readl(hsotg, DCTL); + dctl |= DCTL_PWRONPRGDONE; + dwc2_writel(hsotg, dctl, DCTL); + + /* Set in_ppd flag to 0 as here core exits from suspend. */ + hsotg->in_ppd = 0; + hsotg->lx_state = DWC2_L0; + + dev_dbg(hsotg->dev, "Exiting device partial Power Down completed.\n"); + return ret; +} + +/** + * dwc2_gadget_enter_clock_gating() - Put controller in clock gating. + * + * @hsotg: Programming view of the DWC_otg controller + * + * Return: non-zero if failed to enter device partial power down. + * + * This function is for entering device mode clock gating. + */ +void dwc2_gadget_enter_clock_gating(struct dwc2_hsotg *hsotg) +{ + u32 pcgctl; + + dev_dbg(hsotg->dev, "Entering device clock gating.\n"); + + /* 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->lx_state = DWC2_L2; + hsotg->bus_suspended = true; +} + +/* + * dwc2_gadget_exit_clock_gating() - Exit controller from device clock gating. + * + * @hsotg: Programming view of the DWC_otg controller + * @rem_wakeup: indicates whether remote wake up is enabled. + * + * This function is for exiting from device mode clock gating. + */ +void dwc2_gadget_exit_clock_gating(struct dwc2_hsotg *hsotg, int rem_wakeup) +{ + u32 pcgctl; + u32 dctl; + + dev_dbg(hsotg->dev, "Exiting device 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); + + if (rem_wakeup) { + /* Set Remote Wakeup Signaling */ + dctl = dwc2_readl(hsotg, DCTL); + dctl |= DCTL_RMTWKUPSIG; + dwc2_writel(hsotg, dctl, DCTL); + } + + /* Change to L0 state */ + call_gadget(hsotg, resume); + hsotg->lx_state = DWC2_L0; + hsotg->bus_suspended = false; +} |