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Diffstat (limited to '')
| -rw-r--r-- | drivers/usb/musb/musb_host.c | 2765 |
1 files changed, 2765 insertions, 0 deletions
diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c new file mode 100644 index 000000000..1880b0f20 --- /dev/null +++ b/drivers/usb/musb/musb_host.c @@ -0,0 +1,2765 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * MUSB OTG driver host support + * + * Copyright 2005 Mentor Graphics Corporation + * Copyright (C) 2005-2006 by Texas Instruments + * Copyright (C) 2006-2007 Nokia Corporation + * Copyright (C) 2008-2009 MontaVista Software, Inc. <source@mvista.com> + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/delay.h> +#include <linux/sched.h> +#include <linux/slab.h> +#include <linux/errno.h> +#include <linux/list.h> +#include <linux/dma-mapping.h> + +#include "musb_core.h" +#include "musb_host.h" +#include "musb_trace.h" + +/* MUSB HOST status 22-mar-2006 + * + * - There's still lots of partial code duplication for fault paths, so + * they aren't handled as consistently as they need to be. + * + * - PIO mostly behaved when last tested. + * + including ep0, with all usbtest cases 9, 10 + * + usbtest 14 (ep0out) doesn't seem to run at all + * + double buffered OUT/TX endpoints saw stalls(!) with certain usbtest + * configurations, but otherwise double buffering passes basic tests. + * + for 2.6.N, for N > ~10, needs API changes for hcd framework. + * + * - DMA (CPPI) ... partially behaves, not currently recommended + * + about 1/15 the speed of typical EHCI implementations (PCI) + * + RX, all too often reqpkt seems to misbehave after tx + * + TX, no known issues (other than evident silicon issue) + * + * - DMA (Mentor/OMAP) ...has at least toggle update problems + * + * - [23-feb-2009] minimal traffic scheduling to avoid bulk RX packet + * starvation ... nothing yet for TX, interrupt, or bulk. + * + * - Not tested with HNP, but some SRP paths seem to behave. + * + * NOTE 24-August-2006: + * + * - Bulk traffic finally uses both sides of hardware ep1, freeing up an + * extra endpoint for periodic use enabling hub + keybd + mouse. That + * mostly works, except that with "usbnet" it's easy to trigger cases + * with "ping" where RX loses. (a) ping to davinci, even "ping -f", + * fine; but (b) ping _from_ davinci, even "ping -c 1", ICMP RX loses + * although ARP RX wins. (That test was done with a full speed link.) + */ + + +/* + * NOTE on endpoint usage: + * + * CONTROL transfers all go through ep0. BULK ones go through dedicated IN + * and OUT endpoints ... hardware is dedicated for those "async" queue(s). + * (Yes, bulk _could_ use more of the endpoints than that, and would even + * benefit from it.) + * + * INTERUPPT and ISOCHRONOUS transfers are scheduled to the other endpoints. + * So far that scheduling is both dumb and optimistic: the endpoint will be + * "claimed" until its software queue is no longer refilled. No multiplexing + * of transfers between endpoints, or anything clever. + */ + +struct musb *hcd_to_musb(struct usb_hcd *hcd) +{ + return *(struct musb **) hcd->hcd_priv; +} + + +static void musb_ep_program(struct musb *musb, u8 epnum, + struct urb *urb, int is_out, + u8 *buf, u32 offset, u32 len); + +/* + * Clear TX fifo. Needed to avoid BABBLE errors. + */ +static void musb_h_tx_flush_fifo(struct musb_hw_ep *ep) +{ + struct musb *musb = ep->musb; + void __iomem *epio = ep->regs; + u16 csr; + int retries = 1000; + + csr = musb_readw(epio, MUSB_TXCSR); + while (csr & MUSB_TXCSR_FIFONOTEMPTY) { + csr |= MUSB_TXCSR_FLUSHFIFO | MUSB_TXCSR_TXPKTRDY; + musb_writew(epio, MUSB_TXCSR, csr); + csr = musb_readw(epio, MUSB_TXCSR); + + /* + * FIXME: sometimes the tx fifo flush failed, it has been + * observed during device disconnect on AM335x. + * + * To reproduce the issue, ensure tx urb(s) are queued when + * unplug the usb device which is connected to AM335x usb + * host port. + * + * I found using a usb-ethernet device and running iperf + * (client on AM335x) has very high chance to trigger it. + * + * Better to turn on musb_dbg() in musb_cleanup_urb() with + * CPPI enabled to see the issue when aborting the tx channel. + */ + if (dev_WARN_ONCE(musb->controller, retries-- < 1, + "Could not flush host TX%d fifo: csr: %04x\n", + ep->epnum, csr)) + return; + mdelay(1); + } +} + +static void musb_h_ep0_flush_fifo(struct musb_hw_ep *ep) +{ + void __iomem *epio = ep->regs; + u16 csr; + int retries = 5; + + /* scrub any data left in the fifo */ + do { + csr = musb_readw(epio, MUSB_TXCSR); + if (!(csr & (MUSB_CSR0_TXPKTRDY | MUSB_CSR0_RXPKTRDY))) + break; + musb_writew(epio, MUSB_TXCSR, MUSB_CSR0_FLUSHFIFO); + csr = musb_readw(epio, MUSB_TXCSR); + udelay(10); + } while (--retries); + + WARN(!retries, "Could not flush host TX%d fifo: csr: %04x\n", + ep->epnum, csr); + + /* and reset for the next transfer */ + musb_writew(epio, MUSB_TXCSR, 0); +} + +/* + * Start transmit. Caller is responsible for locking shared resources. + * musb must be locked. + */ +static inline void musb_h_tx_start(struct musb_hw_ep *ep) +{ + u16 txcsr; + + /* NOTE: no locks here; caller should lock and select EP */ + if (ep->epnum) { + txcsr = musb_readw(ep->regs, MUSB_TXCSR); + txcsr |= MUSB_TXCSR_TXPKTRDY | MUSB_TXCSR_H_WZC_BITS; + musb_writew(ep->regs, MUSB_TXCSR, txcsr); + } else { + txcsr = MUSB_CSR0_H_SETUPPKT | MUSB_CSR0_TXPKTRDY; + musb_writew(ep->regs, MUSB_CSR0, txcsr); + } + +} + +static inline void musb_h_tx_dma_start(struct musb_hw_ep *ep) +{ + u16 txcsr; + + /* NOTE: no locks here; caller should lock and select EP */ + txcsr = musb_readw(ep->regs, MUSB_TXCSR); + txcsr |= MUSB_TXCSR_DMAENAB | MUSB_TXCSR_H_WZC_BITS; + if (is_cppi_enabled(ep->musb)) + txcsr |= MUSB_TXCSR_DMAMODE; + musb_writew(ep->regs, MUSB_TXCSR, txcsr); +} + +static void musb_ep_set_qh(struct musb_hw_ep *ep, int is_in, struct musb_qh *qh) +{ + if (is_in != 0 || ep->is_shared_fifo) + ep->in_qh = qh; + if (is_in == 0 || ep->is_shared_fifo) + ep->out_qh = qh; +} + +static struct musb_qh *musb_ep_get_qh(struct musb_hw_ep *ep, int is_in) +{ + return is_in ? ep->in_qh : ep->out_qh; +} + +/* + * Start the URB at the front of an endpoint's queue + * end must be claimed from the caller. + * + * Context: controller locked, irqs blocked + */ +static void +musb_start_urb(struct musb *musb, int is_in, struct musb_qh *qh) +{ + u32 len; + void __iomem *mbase = musb->mregs; + struct urb *urb = next_urb(qh); + void *buf = urb->transfer_buffer; + u32 offset = 0; + struct musb_hw_ep *hw_ep = qh->hw_ep; + int epnum = hw_ep->epnum; + + /* initialize software qh state */ + qh->offset = 0; + qh->segsize = 0; + + /* gather right source of data */ + switch (qh->type) { + case USB_ENDPOINT_XFER_CONTROL: + /* control transfers always start with SETUP */ + is_in = 0; + musb->ep0_stage = MUSB_EP0_START; + buf = urb->setup_packet; + len = 8; + break; + case USB_ENDPOINT_XFER_ISOC: + qh->iso_idx = 0; + qh->frame = 0; + offset = urb->iso_frame_desc[0].offset; + len = urb->iso_frame_desc[0].length; + break; + default: /* bulk, interrupt */ + /* actual_length may be nonzero on retry paths */ + buf = urb->transfer_buffer + urb->actual_length; + len = urb->transfer_buffer_length - urb->actual_length; + } + + trace_musb_urb_start(musb, urb); + + /* Configure endpoint */ + musb_ep_set_qh(hw_ep, is_in, qh); + musb_ep_program(musb, epnum, urb, !is_in, buf, offset, len); + + /* transmit may have more work: start it when it is time */ + if (is_in) + return; + + /* determine if the time is right for a periodic transfer */ + switch (qh->type) { + case USB_ENDPOINT_XFER_ISOC: + case USB_ENDPOINT_XFER_INT: + musb_dbg(musb, "check whether there's still time for periodic Tx"); + /* FIXME this doesn't implement that scheduling policy ... + * or handle framecounter wrapping + */ + if (1) { /* Always assume URB_ISO_ASAP */ + /* REVISIT the SOF irq handler shouldn't duplicate + * this code; and we don't init urb->start_frame... + */ + qh->frame = 0; + goto start; + } else { + qh->frame = urb->start_frame; + /* enable SOF interrupt so we can count down */ + musb_dbg(musb, "SOF for %d", epnum); +#if 1 /* ifndef CONFIG_ARCH_DAVINCI */ + musb_writeb(mbase, MUSB_INTRUSBE, 0xff); +#endif + } + break; + default: +start: + musb_dbg(musb, "Start TX%d %s", epnum, + hw_ep->tx_channel ? "dma" : "pio"); + + if (!hw_ep->tx_channel) + musb_h_tx_start(hw_ep); + else if (is_cppi_enabled(musb) || tusb_dma_omap(musb)) + musb_h_tx_dma_start(hw_ep); + } +} + +/* Context: caller owns controller lock, IRQs are blocked */ +static void musb_giveback(struct musb *musb, struct urb *urb, int status) +__releases(musb->lock) +__acquires(musb->lock) +{ + trace_musb_urb_gb(musb, urb); + + usb_hcd_unlink_urb_from_ep(musb->hcd, urb); + spin_unlock(&musb->lock); + usb_hcd_giveback_urb(musb->hcd, urb, status); + spin_lock(&musb->lock); +} + +/* + * Advance this hardware endpoint's queue, completing the specified URB and + * advancing to either the next URB queued to that qh, or else invalidating + * that qh and advancing to the next qh scheduled after the current one. + * + * Context: caller owns controller lock, IRQs are blocked + */ +static void musb_advance_schedule(struct musb *musb, struct urb *urb, + struct musb_hw_ep *hw_ep, int is_in) +{ + struct musb_qh *qh = musb_ep_get_qh(hw_ep, is_in); + struct musb_hw_ep *ep = qh->hw_ep; + int ready = qh->is_ready; + int status; + u16 toggle; + + status = (urb->status == -EINPROGRESS) ? 0 : urb->status; + + /* save toggle eagerly, for paranoia */ + switch (qh->type) { + case USB_ENDPOINT_XFER_BULK: + case USB_ENDPOINT_XFER_INT: + toggle = musb->io.get_toggle(qh, !is_in); + usb_settoggle(urb->dev, qh->epnum, !is_in, toggle ? 1 : 0); + break; + case USB_ENDPOINT_XFER_ISOC: + if (status == 0 && urb->error_count) + status = -EXDEV; + break; + } + + qh->is_ready = 0; + musb_giveback(musb, urb, status); + qh->is_ready = ready; + + /* + * musb->lock had been unlocked in musb_giveback, so qh may + * be freed, need to get it again + */ + qh = musb_ep_get_qh(hw_ep, is_in); + + /* reclaim resources (and bandwidth) ASAP; deschedule it, and + * invalidate qh as soon as list_empty(&hep->urb_list) + */ + if (qh && list_empty(&qh->hep->urb_list)) { + struct list_head *head; + struct dma_controller *dma = musb->dma_controller; + + if (is_in) { + ep->rx_reinit = 1; + if (ep->rx_channel) { + dma->channel_release(ep->rx_channel); + ep->rx_channel = NULL; + } + } else { + ep->tx_reinit = 1; + if (ep->tx_channel) { + dma->channel_release(ep->tx_channel); + ep->tx_channel = NULL; + } + } + + /* Clobber old pointers to this qh */ + musb_ep_set_qh(ep, is_in, NULL); + qh->hep->hcpriv = NULL; + + switch (qh->type) { + + case USB_ENDPOINT_XFER_CONTROL: + case USB_ENDPOINT_XFER_BULK: + /* fifo policy for these lists, except that NAKing + * should rotate a qh to the end (for fairness). + */ + if (qh->mux == 1) { + head = qh->ring.prev; + list_del(&qh->ring); + kfree(qh); + qh = first_qh(head); + break; + } + fallthrough; + + case USB_ENDPOINT_XFER_ISOC: + case USB_ENDPOINT_XFER_INT: + /* this is where periodic bandwidth should be + * de-allocated if it's tracked and allocated; + * and where we'd update the schedule tree... + */ + kfree(qh); + qh = NULL; + break; + } + } + + if (qh != NULL && qh->is_ready) { + musb_dbg(musb, "... next ep%d %cX urb %p", + hw_ep->epnum, is_in ? 'R' : 'T', next_urb(qh)); + musb_start_urb(musb, is_in, qh); + } +} + +static u16 musb_h_flush_rxfifo(struct musb_hw_ep *hw_ep, u16 csr) +{ + /* we don't want fifo to fill itself again; + * ignore dma (various models), + * leave toggle alone (may not have been saved yet) + */ + csr |= MUSB_RXCSR_FLUSHFIFO | MUSB_RXCSR_RXPKTRDY; + csr &= ~(MUSB_RXCSR_H_REQPKT + | MUSB_RXCSR_H_AUTOREQ + | MUSB_RXCSR_AUTOCLEAR); + + /* write 2x to allow double buffering */ + musb_writew(hw_ep->regs, MUSB_RXCSR, csr); + musb_writew(hw_ep->regs, MUSB_RXCSR, csr); + + /* flush writebuffer */ + return musb_readw(hw_ep->regs, MUSB_RXCSR); +} + +/* + * PIO RX for a packet (or part of it). + */ +static bool +musb_host_packet_rx(struct musb *musb, struct urb *urb, u8 epnum, u8 iso_err) +{ + u16 rx_count; + u8 *buf; + u16 csr; + bool done = false; + u32 length; + int do_flush = 0; + struct musb_hw_ep *hw_ep = musb->endpoints + epnum; + void __iomem *epio = hw_ep->regs; + struct musb_qh *qh = hw_ep->in_qh; + int pipe = urb->pipe; + void *buffer = urb->transfer_buffer; + + /* musb_ep_select(mbase, epnum); */ + rx_count = musb_readw(epio, MUSB_RXCOUNT); + musb_dbg(musb, "RX%d count %d, buffer %p len %d/%d", epnum, rx_count, + urb->transfer_buffer, qh->offset, + urb->transfer_buffer_length); + + /* unload FIFO */ + if (usb_pipeisoc(pipe)) { + int status = 0; + struct usb_iso_packet_descriptor *d; + + if (iso_err) { + status = -EILSEQ; + urb->error_count++; + } + + d = urb->iso_frame_desc + qh->iso_idx; + buf = buffer + d->offset; + length = d->length; + if (rx_count > length) { + if (status == 0) { + status = -EOVERFLOW; + urb->error_count++; + } + musb_dbg(musb, "OVERFLOW %d into %d", rx_count, length); + do_flush = 1; + } else + length = rx_count; + urb->actual_length += length; + d->actual_length = length; + + d->status = status; + + /* see if we are done */ + done = (++qh->iso_idx >= urb->number_of_packets); + } else { + /* non-isoch */ + buf = buffer + qh->offset; + length = urb->transfer_buffer_length - qh->offset; + if (rx_count > length) { + if (urb->status == -EINPROGRESS) + urb->status = -EOVERFLOW; + musb_dbg(musb, "OVERFLOW %d into %d", rx_count, length); + do_flush = 1; + } else + length = rx_count; + urb->actual_length += length; + qh->offset += length; + + /* see if we are done */ + done = (urb->actual_length == urb->transfer_buffer_length) + || (rx_count < qh->maxpacket) + || (urb->status != -EINPROGRESS); + if (done + && (urb->status == -EINPROGRESS) + && (urb->transfer_flags & URB_SHORT_NOT_OK) + && (urb->actual_length + < urb->transfer_buffer_length)) + urb->status = -EREMOTEIO; + } + + musb_read_fifo(hw_ep, length, buf); + + csr = musb_readw(epio, MUSB_RXCSR); + csr |= MUSB_RXCSR_H_WZC_BITS; + if (unlikely(do_flush)) + musb_h_flush_rxfifo(hw_ep, csr); + else { + /* REVISIT this assumes AUTOCLEAR is never set */ + csr &= ~(MUSB_RXCSR_RXPKTRDY | MUSB_RXCSR_H_REQPKT); + if (!done) + csr |= MUSB_RXCSR_H_REQPKT; + musb_writew(epio, MUSB_RXCSR, csr); + } + + return done; +} + +/* we don't always need to reinit a given side of an endpoint... + * when we do, use tx/rx reinit routine and then construct a new CSR + * to address data toggle, NYET, and DMA or PIO. + * + * it's possible that driver bugs (especially for DMA) or aborting a + * transfer might have left the endpoint busier than it should be. + * the busy/not-empty tests are basically paranoia. + */ +static void +musb_rx_reinit(struct musb *musb, struct musb_qh *qh, u8 epnum) +{ + struct musb_hw_ep *ep = musb->endpoints + epnum; + u16 csr; + + /* NOTE: we know the "rx" fifo reinit never triggers for ep0. + * That always uses tx_reinit since ep0 repurposes TX register + * offsets; the initial SETUP packet is also a kind of OUT. + */ + + /* if programmed for Tx, put it in RX mode */ + if (ep->is_shared_fifo) { + csr = musb_readw(ep->regs, MUSB_TXCSR); + if (csr & MUSB_TXCSR_MODE) { + musb_h_tx_flush_fifo(ep); + csr = musb_readw(ep->regs, MUSB_TXCSR); + musb_writew(ep->regs, MUSB_TXCSR, + csr | MUSB_TXCSR_FRCDATATOG); + } + + /* + * Clear the MODE bit (and everything else) to enable Rx. + * NOTE: we mustn't clear the DMAMODE bit before DMAENAB. + */ + if (csr & MUSB_TXCSR_DMAMODE) + musb_writew(ep->regs, MUSB_TXCSR, MUSB_TXCSR_DMAMODE); + musb_writew(ep->regs, MUSB_TXCSR, 0); + + /* scrub all previous state, clearing toggle */ + } + csr = musb_readw(ep->regs, MUSB_RXCSR); + if (csr & MUSB_RXCSR_RXPKTRDY) + WARNING("rx%d, packet/%d ready?\n", ep->epnum, + musb_readw(ep->regs, MUSB_RXCOUNT)); + + musb_h_flush_rxfifo(ep, MUSB_RXCSR_CLRDATATOG); + + /* target addr and (for multipoint) hub addr/port */ + if (musb->is_multipoint) { + musb_write_rxfunaddr(musb, epnum, qh->addr_reg); + musb_write_rxhubaddr(musb, epnum, qh->h_addr_reg); + musb_write_rxhubport(musb, epnum, qh->h_port_reg); + } else + musb_writeb(musb->mregs, MUSB_FADDR, qh->addr_reg); + + /* protocol/endpoint, interval/NAKlimit, i/o size */ + musb_writeb(ep->regs, MUSB_RXTYPE, qh->type_reg); + musb_writeb(ep->regs, MUSB_RXINTERVAL, qh->intv_reg); + /* NOTE: bulk combining rewrites high bits of maxpacket */ + /* Set RXMAXP with the FIFO size of the endpoint + * to disable double buffer mode. + */ + musb_writew(ep->regs, MUSB_RXMAXP, + qh->maxpacket | ((qh->hb_mult - 1) << 11)); + + ep->rx_reinit = 0; +} + +static void musb_tx_dma_set_mode_mentor(struct dma_controller *dma, + struct musb_hw_ep *hw_ep, struct musb_qh *qh, + struct urb *urb, u32 offset, + u32 *length, u8 *mode) +{ + struct dma_channel *channel = hw_ep->tx_channel; + void __iomem *epio = hw_ep->regs; + u16 pkt_size = qh->maxpacket; + u16 csr; + + if (*length > channel->max_len) + *length = channel->max_len; + + csr = musb_readw(epio, MUSB_TXCSR); + if (*length > pkt_size) { + *mode = 1; + csr |= MUSB_TXCSR_DMAMODE | MUSB_TXCSR_DMAENAB; + /* autoset shouldn't be set in high bandwidth */ + /* + * Enable Autoset according to table + * below + * bulk_split hb_mult Autoset_Enable + * 0 1 Yes(Normal) + * 0 >1 No(High BW ISO) + * 1 1 Yes(HS bulk) + * 1 >1 Yes(FS bulk) + */ + if (qh->hb_mult == 1 || (qh->hb_mult > 1 && + can_bulk_split(hw_ep->musb, qh->type))) + csr |= MUSB_TXCSR_AUTOSET; + } else { + *mode = 0; + csr &= ~(MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAMODE); + csr |= MUSB_TXCSR_DMAENAB; /* against programmer's guide */ + } + channel->desired_mode = *mode; + musb_writew(epio, MUSB_TXCSR, csr); +} + +static void musb_tx_dma_set_mode_cppi_tusb(struct dma_controller *dma, + struct musb_hw_ep *hw_ep, + struct musb_qh *qh, + struct urb *urb, + u32 offset, + u32 *length, + u8 *mode) +{ + struct dma_channel *channel = hw_ep->tx_channel; + + channel->actual_len = 0; + + /* + * TX uses "RNDIS" mode automatically but needs help + * to identify the zero-length-final-packet case. + */ + *mode = (urb->transfer_flags & URB_ZERO_PACKET) ? 1 : 0; +} + +static bool musb_tx_dma_program(struct dma_controller *dma, + struct musb_hw_ep *hw_ep, struct musb_qh *qh, + struct urb *urb, u32 offset, u32 length) +{ + struct dma_channel *channel = hw_ep->tx_channel; + u16 pkt_size = qh->maxpacket; + u8 mode; + + if (musb_dma_inventra(hw_ep->musb) || musb_dma_ux500(hw_ep->musb)) + musb_tx_dma_set_mode_mentor(dma, hw_ep, qh, urb, offset, + &length, &mode); + else if (is_cppi_enabled(hw_ep->musb) || tusb_dma_omap(hw_ep->musb)) + musb_tx_dma_set_mode_cppi_tusb(dma, hw_ep, qh, urb, offset, + &length, &mode); + else + return false; + + qh->segsize = length; + + /* + * Ensure the data reaches to main memory before starting + * DMA transfer + */ + wmb(); + + if (!dma->channel_program(channel, pkt_size, mode, + urb->transfer_dma + offset, length)) { + void __iomem *epio = hw_ep->regs; + u16 csr; + + dma->channel_release(channel); + hw_ep->tx_channel = NULL; + + csr = musb_readw(epio, MUSB_TXCSR); + csr &= ~(MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAENAB); + musb_writew(epio, MUSB_TXCSR, csr | MUSB_TXCSR_H_WZC_BITS); + return false; + } + return true; +} + +/* + * Program an HDRC endpoint as per the given URB + * Context: irqs blocked, controller lock held + */ +static void musb_ep_program(struct musb *musb, u8 epnum, + struct urb *urb, int is_out, + u8 *buf, u32 offset, u32 len) +{ + struct dma_controller *dma_controller; + struct dma_channel *dma_channel; + u8 dma_ok; + void __iomem *mbase = musb->mregs; + struct musb_hw_ep *hw_ep = musb->endpoints + epnum; + void __iomem *epio = hw_ep->regs; + struct musb_qh *qh = musb_ep_get_qh(hw_ep, !is_out); + u16 packet_sz = qh->maxpacket; + u8 use_dma = 1; + u16 csr; + + musb_dbg(musb, "%s hw%d urb %p spd%d dev%d ep%d%s " + "h_addr%02x h_port%02x bytes %d", + is_out ? "-->" : "<--", + epnum, urb, urb->dev->speed, + qh->addr_reg, qh->epnum, is_out ? "out" : "in", + qh->h_addr_reg, qh->h_port_reg, + len); + + musb_ep_select(mbase, epnum); + + if (is_out && !len) { + use_dma = 0; + csr = musb_readw(epio, MUSB_TXCSR); + csr &= ~MUSB_TXCSR_DMAENAB; + musb_writew(epio, MUSB_TXCSR, csr); + hw_ep->tx_channel = NULL; + } + + /* candidate for DMA? */ + dma_controller = musb->dma_controller; + if (use_dma && is_dma_capable() && epnum && dma_controller) { + dma_channel = is_out ? hw_ep->tx_channel : hw_ep->rx_channel; + if (!dma_channel) { + dma_channel = dma_controller->channel_alloc( + dma_controller, hw_ep, is_out); + if (is_out) + hw_ep->tx_channel = dma_channel; + else + hw_ep->rx_channel = dma_channel; + } + } else + dma_channel = NULL; + + /* make sure we clear DMAEnab, autoSet bits from previous run */ + + /* OUT/transmit/EP0 or IN/receive? */ + if (is_out) { + u16 csr; + u16 int_txe; + u16 load_count; + + csr = musb_readw(epio, MUSB_TXCSR); + + /* disable interrupt in case we flush */ + int_txe = musb->intrtxe; + musb_writew(mbase, MUSB_INTRTXE, int_txe & ~(1 << epnum)); + + /* general endpoint setup */ + if (epnum) { + /* flush all old state, set default */ + /* + * We could be flushing valid + * packets in double buffering + * case + */ + if (!hw_ep->tx_double_buffered) + musb_h_tx_flush_fifo(hw_ep); + + /* + * We must not clear the DMAMODE bit before or in + * the same cycle with the DMAENAB bit, so we clear + * the latter first... + */ + csr &= ~(MUSB_TXCSR_H_NAKTIMEOUT + | MUSB_TXCSR_AUTOSET + | MUSB_TXCSR_DMAENAB + | MUSB_TXCSR_FRCDATATOG + | MUSB_TXCSR_H_RXSTALL + | MUSB_TXCSR_H_ERROR + | MUSB_TXCSR_TXPKTRDY + ); + csr |= MUSB_TXCSR_MODE; + + if (!hw_ep->tx_double_buffered) + csr |= musb->io.set_toggle(qh, is_out, urb); + + musb_writew(epio, MUSB_TXCSR, csr); + /* REVISIT may need to clear FLUSHFIFO ... */ + csr &= ~MUSB_TXCSR_DMAMODE; + musb_writew(epio, MUSB_TXCSR, csr); + csr = musb_readw(epio, MUSB_TXCSR); + } else { + /* endpoint 0: just flush */ + musb_h_ep0_flush_fifo(hw_ep); + } + + /* target addr and (for multipoint) hub addr/port */ + if (musb->is_multipoint) { + musb_write_txfunaddr(musb, epnum, qh->addr_reg); + musb_write_txhubaddr(musb, epnum, qh->h_addr_reg); + musb_write_txhubport(musb, epnum, qh->h_port_reg); +/* FIXME if !epnum, do the same for RX ... */ + } else + musb_writeb(mbase, MUSB_FADDR, qh->addr_reg); + + /* protocol/endpoint/interval/NAKlimit */ + if (epnum) { + musb_writeb(epio, MUSB_TXTYPE, qh->type_reg); + if (can_bulk_split(musb, qh->type)) { + qh->hb_mult = hw_ep->max_packet_sz_tx + / packet_sz; + musb_writew(epio, MUSB_TXMAXP, packet_sz + | ((qh->hb_mult) - 1) << 11); + } else { + musb_writew(epio, MUSB_TXMAXP, + qh->maxpacket | + ((qh->hb_mult - 1) << 11)); + } + musb_writeb(epio, MUSB_TXINTERVAL, qh->intv_reg); + } else { + musb_writeb(epio, MUSB_NAKLIMIT0, qh->intv_reg); + if (musb->is_multipoint) + musb_writeb(epio, MUSB_TYPE0, + qh->type_reg); + } + + if (can_bulk_split(musb, qh->type)) + load_count = min((u32) hw_ep->max_packet_sz_tx, + len); + else + load_count = min((u32) packet_sz, len); + + if (dma_channel && musb_tx_dma_program(dma_controller, + hw_ep, qh, urb, offset, len)) + load_count = 0; + + if (load_count) { + /* PIO to load FIFO */ + qh->segsize = load_count; + if (!buf) { + sg_miter_start(&qh->sg_miter, urb->sg, 1, + SG_MITER_ATOMIC + | SG_MITER_FROM_SG); + if (!sg_miter_next(&qh->sg_miter)) { + dev_err(musb->controller, + "error: sg" + "list empty\n"); + sg_miter_stop(&qh->sg_miter); + goto finish; + } + buf = qh->sg_miter.addr + urb->sg->offset + + urb->actual_length; + load_count = min_t(u32, load_count, + qh->sg_miter.length); + musb_write_fifo(hw_ep, load_count, buf); + qh->sg_miter.consumed = load_count; + sg_miter_stop(&qh->sg_miter); + } else + musb_write_fifo(hw_ep, load_count, buf); + } +finish: + /* re-enable interrupt */ + musb_writew(mbase, MUSB_INTRTXE, int_txe); + + /* IN/receive */ + } else { + u16 csr = 0; + + if (hw_ep->rx_reinit) { + musb_rx_reinit(musb, qh, epnum); + csr |= musb->io.set_toggle(qh, is_out, urb); + + if (qh->type == USB_ENDPOINT_XFER_INT) + csr |= MUSB_RXCSR_DISNYET; + + } else { + csr = musb_readw(hw_ep->regs, MUSB_RXCSR); + + if (csr & (MUSB_RXCSR_RXPKTRDY + | MUSB_RXCSR_DMAENAB + | MUSB_RXCSR_H_REQPKT)) + ERR("broken !rx_reinit, ep%d csr %04x\n", + hw_ep->epnum, csr); + + /* scrub any stale state, leaving toggle alone */ + csr &= MUSB_RXCSR_DISNYET; + } + + /* kick things off */ + + if ((is_cppi_enabled(musb) || tusb_dma_omap(musb)) && dma_channel) { + /* Candidate for DMA */ + dma_channel->actual_len = 0L; + qh->segsize = len; + + /* AUTOREQ is in a DMA register */ + musb_writew(hw_ep->regs, MUSB_RXCSR, csr); + csr = musb_readw(hw_ep->regs, MUSB_RXCSR); + + /* + * Unless caller treats short RX transfers as + * errors, we dare not queue multiple transfers. + */ + dma_ok = dma_controller->channel_program(dma_channel, + packet_sz, !(urb->transfer_flags & + URB_SHORT_NOT_OK), + urb->transfer_dma + offset, + qh->segsize); + if (!dma_ok) { + dma_controller->channel_release(dma_channel); + hw_ep->rx_channel = dma_channel = NULL; + } else + csr |= MUSB_RXCSR_DMAENAB; + } + + csr |= MUSB_RXCSR_H_REQPKT; + musb_dbg(musb, "RXCSR%d := %04x", epnum, csr); + musb_writew(hw_ep->regs, MUSB_RXCSR, csr); + csr = musb_readw(hw_ep->regs, MUSB_RXCSR); + } +} + +/* Schedule next QH from musb->in_bulk/out_bulk and move the current qh to + * the end; avoids starvation for other endpoints. + */ +static void musb_bulk_nak_timeout(struct musb *musb, struct musb_hw_ep *ep, + int is_in) +{ + struct dma_channel *dma; + struct urb *urb; + void __iomem *mbase = musb->mregs; + void __iomem *epio = ep->regs; + struct musb_qh *cur_qh, *next_qh; + u16 rx_csr, tx_csr; + u16 toggle; + + musb_ep_select(mbase, ep->epnum); + if (is_in) { + dma = is_dma_capable() ? ep->rx_channel : NULL; + + /* + * Need to stop the transaction by clearing REQPKT first + * then the NAK Timeout bit ref MUSBMHDRC USB 2.0 HIGH-SPEED + * DUAL-ROLE CONTROLLER Programmer's Guide, section 9.2.2 + */ + rx_csr = musb_readw(epio, MUSB_RXCSR); + rx_csr |= MUSB_RXCSR_H_WZC_BITS; + rx_csr &= ~MUSB_RXCSR_H_REQPKT; + musb_writew(epio, MUSB_RXCSR, rx_csr); + rx_csr &= ~MUSB_RXCSR_DATAERROR; + musb_writew(epio, MUSB_RXCSR, rx_csr); + + cur_qh = first_qh(&musb->in_bulk); + } else { + dma = is_dma_capable() ? ep->tx_channel : NULL; + + /* clear nak timeout bit */ + tx_csr = musb_readw(epio, MUSB_TXCSR); + tx_csr |= MUSB_TXCSR_H_WZC_BITS; + tx_csr &= ~MUSB_TXCSR_H_NAKTIMEOUT; + musb_writew(epio, MUSB_TXCSR, tx_csr); + + cur_qh = first_qh(&musb->out_bulk); + } + if (cur_qh) { + urb = next_urb(cur_qh); + if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) { + dma->status = MUSB_DMA_STATUS_CORE_ABORT; + musb->dma_controller->channel_abort(dma); + urb->actual_length += dma->actual_len; + dma->actual_len = 0L; + } + toggle = musb->io.get_toggle(cur_qh, !is_in); + usb_settoggle(urb->dev, cur_qh->epnum, !is_in, toggle ? 1 : 0); + + if (is_in) { + /* move cur_qh to end of queue */ + list_move_tail(&cur_qh->ring, &musb->in_bulk); + + /* get the next qh from musb->in_bulk */ + next_qh = first_qh(&musb->in_bulk); + + /* set rx_reinit and schedule the next qh */ + ep->rx_reinit = 1; + } else { + /* move cur_qh to end of queue */ + list_move_tail(&cur_qh->ring, &musb->out_bulk); + + /* get the next qh from musb->out_bulk */ + next_qh = first_qh(&musb->out_bulk); + + /* set tx_reinit and schedule the next qh */ + ep->tx_reinit = 1; + } + + if (next_qh) + musb_start_urb(musb, is_in, next_qh); + } +} + +/* + * Service the default endpoint (ep0) as host. + * Return true until it's time to start the status stage. + */ +static bool musb_h_ep0_continue(struct musb *musb, u16 len, struct urb *urb) +{ + bool more = false; + u8 *fifo_dest = NULL; + u16 fifo_count = 0; + struct musb_hw_ep *hw_ep = musb->control_ep; + struct musb_qh *qh = hw_ep->in_qh; + struct usb_ctrlrequest *request; + + switch (musb->ep0_stage) { + case MUSB_EP0_IN: + fifo_dest = urb->transfer_buffer + urb->actual_length; + fifo_count = min_t(size_t, len, urb->transfer_buffer_length - + urb->actual_length); + if (fifo_count < len) + urb->status = -EOVERFLOW; + + musb_read_fifo(hw_ep, fifo_count, fifo_dest); + + urb->actual_length += fifo_count; + if (len < qh->maxpacket) { + /* always terminate on short read; it's + * rarely reported as an error. + */ + } else if (urb->actual_length < + urb->transfer_buffer_length) + more = true; + break; + case MUSB_EP0_START: + request = (struct usb_ctrlrequest *) urb->setup_packet; + + if (!request->wLength) { + musb_dbg(musb, "start no-DATA"); + break; + } else if (request->bRequestType & USB_DIR_IN) { + musb_dbg(musb, "start IN-DATA"); + musb->ep0_stage = MUSB_EP0_IN; + more = true; + break; + } else { + musb_dbg(musb, "start OUT-DATA"); + musb->ep0_stage = MUSB_EP0_OUT; + more = true; + } + fallthrough; + case MUSB_EP0_OUT: + fifo_count = min_t(size_t, qh->maxpacket, + urb->transfer_buffer_length - + urb->actual_length); + if (fifo_count) { + fifo_dest = (u8 *) (urb->transfer_buffer + + urb->actual_length); + musb_dbg(musb, "Sending %d byte%s to ep0 fifo %p", + fifo_count, + (fifo_count == 1) ? "" : "s", + fifo_dest); + musb_write_fifo(hw_ep, fifo_count, fifo_dest); + + urb->actual_length += fifo_count; + more = true; + } + break; + default: + ERR("bogus ep0 stage %d\n", musb->ep0_stage); + break; + } + + return more; +} + +/* + * Handle default endpoint interrupt as host. Only called in IRQ time + * from musb_interrupt(). + * + * called with controller irqlocked + */ +irqreturn_t musb_h_ep0_irq(struct musb *musb) +{ + struct urb *urb; + u16 csr, len; + int status = 0; + void __iomem *mbase = musb->mregs; + struct musb_hw_ep *hw_ep = musb->control_ep; + void __iomem *epio = hw_ep->regs; + struct musb_qh *qh = hw_ep->in_qh; + bool complete = false; + irqreturn_t retval = IRQ_NONE; + + /* ep0 only has one queue, "in" */ + urb = next_urb(qh); + + musb_ep_select(mbase, 0); + csr = musb_readw(epio, MUSB_CSR0); + len = (csr & MUSB_CSR0_RXPKTRDY) + ? musb_readb(epio, MUSB_COUNT0) + : 0; + + musb_dbg(musb, "<== csr0 %04x, qh %p, count %d, urb %p, stage %d", + csr, qh, len, urb, musb->ep0_stage); + + /* if we just did status stage, we are done */ + if (MUSB_EP0_STATUS == musb->ep0_stage) { + retval = IRQ_HANDLED; + complete = true; + } + + /* prepare status */ + if (csr & MUSB_CSR0_H_RXSTALL) { + musb_dbg(musb, "STALLING ENDPOINT"); + status = -EPIPE; + + } else if (csr & MUSB_CSR0_H_ERROR) { + musb_dbg(musb, "no response, csr0 %04x", csr); + status = -EPROTO; + + } else if (csr & MUSB_CSR0_H_NAKTIMEOUT) { + musb_dbg(musb, "control NAK timeout"); + + /* NOTE: this code path would be a good place to PAUSE a + * control transfer, if another one is queued, so that + * ep0 is more likely to stay busy. That's already done + * for bulk RX transfers. + * + * if (qh->ring.next != &musb->control), then + * we have a candidate... NAKing is *NOT* an error + */ + musb_writew(epio, MUSB_CSR0, 0); + retval = IRQ_HANDLED; + } + + if (status) { + musb_dbg(musb, "aborting"); + retval = IRQ_HANDLED; + if (urb) + urb->status = status; + complete = true; + + /* use the proper sequence to abort the transfer */ + if (csr & MUSB_CSR0_H_REQPKT) { + csr &= ~MUSB_CSR0_H_REQPKT; + musb_writew(epio, MUSB_CSR0, csr); + csr &= ~MUSB_CSR0_H_NAKTIMEOUT; + musb_writew(epio, MUSB_CSR0, csr); + } else { + musb_h_ep0_flush_fifo(hw_ep); + } + + musb_writeb(epio, MUSB_NAKLIMIT0, 0); + + /* clear it */ + musb_writew(epio, MUSB_CSR0, 0); + } + + if (unlikely(!urb)) { + /* stop endpoint since we have no place for its data, this + * SHOULD NEVER HAPPEN! */ + ERR("no URB for end 0\n"); + + musb_h_ep0_flush_fifo(hw_ep); + goto done; + } + + if (!complete) { + /* call common logic and prepare response */ + if (musb_h_ep0_continue(musb, len, urb)) { + /* more packets required */ + csr = (MUSB_EP0_IN == musb->ep0_stage) + ? MUSB_CSR0_H_REQPKT : MUSB_CSR0_TXPKTRDY; + } else { + /* data transfer complete; perform status phase */ + if (usb_pipeout(urb->pipe) + || !urb->transfer_buffer_length) + csr = MUSB_CSR0_H_STATUSPKT + | MUSB_CSR0_H_REQPKT; + else + csr = MUSB_CSR0_H_STATUSPKT + | MUSB_CSR0_TXPKTRDY; + + /* disable ping token in status phase */ + csr |= MUSB_CSR0_H_DIS_PING; + + /* flag status stage */ + musb->ep0_stage = MUSB_EP0_STATUS; + + musb_dbg(musb, "ep0 STATUS, csr %04x", csr); + + } + musb_writew(epio, MUSB_CSR0, csr); + retval = IRQ_HANDLED; + } else + musb->ep0_stage = MUSB_EP0_IDLE; + + /* call completion handler if done */ + if (complete) + musb_advance_schedule(musb, urb, hw_ep, 1); +done: + return retval; +} + + +#ifdef CONFIG_USB_INVENTRA_DMA + +/* Host side TX (OUT) using Mentor DMA works as follows: + submit_urb -> + - if queue was empty, Program Endpoint + - ... which starts DMA to fifo in mode 1 or 0 + + DMA Isr (transfer complete) -> TxAvail() + - Stop DMA (~DmaEnab) (<--- Alert ... currently happens + only in musb_cleanup_urb) + - TxPktRdy has to be set in mode 0 or for + short packets in mode 1. +*/ + +#endif + +/* Service a Tx-Available or dma completion irq for the endpoint */ +void musb_host_tx(struct musb *musb, u8 epnum) +{ + int pipe; + bool done = false; + u16 tx_csr; + size_t length = 0; + size_t offset = 0; + struct musb_hw_ep *hw_ep = musb->endpoints + epnum; + void __iomem *epio = hw_ep->regs; + struct musb_qh *qh = hw_ep->out_qh; + struct urb *urb = next_urb(qh); + u32 status = 0; + void __iomem *mbase = musb->mregs; + struct dma_channel *dma; + bool transfer_pending = false; + + musb_ep_select(mbase, epnum); + tx_csr = musb_readw(epio, MUSB_TXCSR); + + /* with CPPI, DMA sometimes triggers "extra" irqs */ + if (!urb) { + musb_dbg(musb, "extra TX%d ready, csr %04x", epnum, tx_csr); + return; + } + + pipe = urb->pipe; + dma = is_dma_capable() ? hw_ep->tx_channel : NULL; + trace_musb_urb_tx(musb, urb); + musb_dbg(musb, "OUT/TX%d end, csr %04x%s", epnum, tx_csr, + dma ? ", dma" : ""); + + /* check for errors */ + if (tx_csr & MUSB_TXCSR_H_RXSTALL) { + /* dma was disabled, fifo flushed */ + musb_dbg(musb, "TX end %d stall", epnum); + + /* stall; record URB status */ + status = -EPIPE; + + } else if (tx_csr & MUSB_TXCSR_H_ERROR) { + /* (NON-ISO) dma was disabled, fifo flushed */ + musb_dbg(musb, "TX 3strikes on ep=%d", epnum); + + status = -ETIMEDOUT; + + } else if (tx_csr & MUSB_TXCSR_H_NAKTIMEOUT) { + if (USB_ENDPOINT_XFER_BULK == qh->type && qh->mux == 1 + && !list_is_singular(&musb->out_bulk)) { + musb_dbg(musb, "NAK timeout on TX%d ep", epnum); + musb_bulk_nak_timeout(musb, hw_ep, 0); + } else { + musb_dbg(musb, "TX ep%d device not responding", epnum); + /* NOTE: this code path would be a good place to PAUSE a + * transfer, if there's some other (nonperiodic) tx urb + * that could use this fifo. (dma complicates it...) + * That's already done for bulk RX transfers. + * + * if (bulk && qh->ring.next != &musb->out_bulk), then + * we have a candidate... NAKing is *NOT* an error + */ + musb_ep_select(mbase, epnum); + musb_writew(epio, MUSB_TXCSR, + MUSB_TXCSR_H_WZC_BITS + | MUSB_TXCSR_TXPKTRDY); + } + return; + } + +done: + if (status) { + if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) { + dma->status = MUSB_DMA_STATUS_CORE_ABORT; + musb->dma_controller->channel_abort(dma); + } + + /* do the proper sequence to abort the transfer in the + * usb core; the dma engine should already be stopped. + */ + musb_h_tx_flush_fifo(hw_ep); + tx_csr &= ~(MUSB_TXCSR_AUTOSET + | MUSB_TXCSR_DMAENAB + | MUSB_TXCSR_H_ERROR + | MUSB_TXCSR_H_RXSTALL + | MUSB_TXCSR_H_NAKTIMEOUT + ); + + musb_ep_select(mbase, epnum); + musb_writew(epio, MUSB_TXCSR, tx_csr); + /* REVISIT may need to clear FLUSHFIFO ... */ + musb_writew(epio, MUSB_TXCSR, tx_csr); + musb_writeb(epio, MUSB_TXINTERVAL, 0); + + done = true; + } + + /* second cppi case */ + if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) { + musb_dbg(musb, "extra TX%d ready, csr %04x", epnum, tx_csr); + return; + } + + if (is_dma_capable() && dma && !status) { + /* + * DMA has completed. But if we're using DMA mode 1 (multi + * packet DMA), we need a terminal TXPKTRDY interrupt before + * we can consider this transfer completed, lest we trash + * its last packet when writing the next URB's data. So we + * switch back to mode 0 to get that interrupt; we'll come + * back here once it happens. + */ + if (tx_csr & MUSB_TXCSR_DMAMODE) { + /* + * We shouldn't clear DMAMODE with DMAENAB set; so + * clear them in a safe order. That should be OK + * once TXPKTRDY has been set (and I've never seen + * it being 0 at this moment -- DMA interrupt latency + * is significant) but if it hasn't been then we have + * no choice but to stop being polite and ignore the + * programmer's guide... :-) + * + * Note that we must write TXCSR with TXPKTRDY cleared + * in order not to re-trigger the packet send (this bit + * can't be cleared by CPU), and there's another caveat: + * TXPKTRDY may be set shortly and then cleared in the + * double-buffered FIFO mode, so we do an extra TXCSR + * read for debouncing... + */ + tx_csr &= musb_readw(epio, MUSB_TXCSR); + if (tx_csr & MUSB_TXCSR_TXPKTRDY) { + tx_csr &= ~(MUSB_TXCSR_DMAENAB | + MUSB_TXCSR_TXPKTRDY); + musb_writew(epio, MUSB_TXCSR, + tx_csr | MUSB_TXCSR_H_WZC_BITS); + } + tx_csr &= ~(MUSB_TXCSR_DMAMODE | + MUSB_TXCSR_TXPKTRDY); + musb_writew(epio, MUSB_TXCSR, + tx_csr | MUSB_TXCSR_H_WZC_BITS); + + /* + * There is no guarantee that we'll get an interrupt + * after clearing DMAMODE as we might have done this + * too late (after TXPKTRDY was cleared by controller). + * Re-read TXCSR as we have spoiled its previous value. + */ + tx_csr = musb_readw(epio, MUSB_TXCSR); + } + + /* + * We may get here from a DMA completion or TXPKTRDY interrupt. + * In any case, we must check the FIFO status here and bail out + * only if the FIFO still has data -- that should prevent the + * "missed" TXPKTRDY interrupts and deal with double-buffered + * FIFO mode too... + */ + if (tx_csr & (MUSB_TXCSR_FIFONOTEMPTY | MUSB_TXCSR_TXPKTRDY)) { + musb_dbg(musb, + "DMA complete but FIFO not empty, CSR %04x", + tx_csr); + return; + } + } + + if (!status || dma || usb_pipeisoc(pipe)) { + if (dma) + length = dma->actual_len; + else + length = qh->segsize; + qh->offset += length; + + if (usb_pipeisoc(pipe)) { + struct usb_iso_packet_descriptor *d; + + d = urb->iso_frame_desc + qh->iso_idx; + d->actual_length = length; + d->status = status; + if (++qh->iso_idx >= urb->number_of_packets) { + done = true; + } else { + d++; + offset = d->offset; + length = d->length; + } + } else if (dma && urb->transfer_buffer_length == qh->offset) { + done = true; + } else { + /* see if we need to send more data, or ZLP */ + if (qh->segsize < qh->maxpacket) + done = true; + else if (qh->offset == urb->transfer_buffer_length + && !(urb->transfer_flags + & URB_ZERO_PACKET)) + done = true; + if (!done) { + offset = qh->offset; + length = urb->transfer_buffer_length - offset; + transfer_pending = true; + } + } + } + + /* urb->status != -EINPROGRESS means request has been faulted, + * so we must abort this transfer after cleanup + */ + if (urb->status != -EINPROGRESS) { + done = true; + if (status == 0) + status = urb->status; + } + + if (done) { + /* set status */ + urb->status = status; + urb->actual_length = qh->offset; + musb_advance_schedule(musb, urb, hw_ep, USB_DIR_OUT); + return; + } else if ((usb_pipeisoc(pipe) || transfer_pending) && dma) { + if (musb_tx_dma_program(musb->dma_controller, hw_ep, qh, urb, + offset, length)) { + if (is_cppi_enabled(musb) || tusb_dma_omap(musb)) + musb_h_tx_dma_start(hw_ep); + return; + } + } else if (tx_csr & MUSB_TXCSR_DMAENAB) { + musb_dbg(musb, "not complete, but DMA enabled?"); + return; + } + + /* + * PIO: start next packet in this URB. + * + * REVISIT: some docs say that when hw_ep->tx_double_buffered, + * (and presumably, FIFO is not half-full) we should write *two* + * packets before updating TXCSR; other docs disagree... + */ + if (length > qh->maxpacket) + length = qh->maxpacket; + /* Unmap the buffer so that CPU can use it */ + usb_hcd_unmap_urb_for_dma(musb->hcd, urb); + + /* + * We need to map sg if the transfer_buffer is + * NULL. + */ + if (!urb->transfer_buffer) { + /* sg_miter_start is already done in musb_ep_program */ + if (!sg_miter_next(&qh->sg_miter)) { + dev_err(musb->controller, "error: sg list empty\n"); + sg_miter_stop(&qh->sg_miter); + status = -EINVAL; + goto done; + } + length = min_t(u32, length, qh->sg_miter.length); + musb_write_fifo(hw_ep, length, qh->sg_miter.addr); + qh->sg_miter.consumed = length; + sg_miter_stop(&qh->sg_miter); + } else { + musb_write_fifo(hw_ep, length, urb->transfer_buffer + offset); + } + + qh->segsize = length; + + musb_ep_select(mbase, epnum); + musb_writew(epio, MUSB_TXCSR, + MUSB_TXCSR_H_WZC_BITS | MUSB_TXCSR_TXPKTRDY); +} + +#ifdef CONFIG_USB_TI_CPPI41_DMA +/* Seems to set up ISO for cppi41 and not advance len. See commit c57c41d */ +static int musb_rx_dma_iso_cppi41(struct dma_controller *dma, + struct musb_hw_ep *hw_ep, + struct musb_qh *qh, + struct urb *urb, + size_t len) +{ + struct dma_channel *channel = hw_ep->rx_channel; + void __iomem *epio = hw_ep->regs; + dma_addr_t *buf; + u32 length; + u16 val; + + buf = (void *)urb->iso_frame_desc[qh->iso_idx].offset + + (u32)urb->transfer_dma; + + length = urb->iso_frame_desc[qh->iso_idx].length; + + val = musb_readw(epio, MUSB_RXCSR); + val |= MUSB_RXCSR_DMAENAB; + musb_writew(hw_ep->regs, MUSB_RXCSR, val); + + return dma->channel_program(channel, qh->maxpacket, 0, + (u32)buf, length); +} +#else +static inline int musb_rx_dma_iso_cppi41(struct dma_controller *dma, + struct musb_hw_ep *hw_ep, + struct musb_qh *qh, + struct urb *urb, + size_t len) +{ + return false; +} +#endif + +#if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_UX500_DMA) || \ + defined(CONFIG_USB_TI_CPPI41_DMA) +/* Host side RX (IN) using Mentor DMA works as follows: + submit_urb -> + - if queue was empty, ProgramEndpoint + - first IN token is sent out (by setting ReqPkt) + LinuxIsr -> RxReady() + /\ => first packet is received + | - Set in mode 0 (DmaEnab, ~ReqPkt) + | -> DMA Isr (transfer complete) -> RxReady() + | - Ack receive (~RxPktRdy), turn off DMA (~DmaEnab) + | - if urb not complete, send next IN token (ReqPkt) + | | else complete urb. + | | + --------------------------- + * + * Nuances of mode 1: + * For short packets, no ack (+RxPktRdy) is sent automatically + * (even if AutoClear is ON) + * For full packets, ack (~RxPktRdy) and next IN token (+ReqPkt) is sent + * automatically => major problem, as collecting the next packet becomes + * difficult. Hence mode 1 is not used. + * + * REVISIT + * All we care about at this driver level is that + * (a) all URBs terminate with REQPKT cleared and fifo(s) empty; + * (b) termination conditions are: short RX, or buffer full; + * (c) fault modes include + * - iff URB_SHORT_NOT_OK, short RX status is -EREMOTEIO. + * (and that endpoint's dma queue stops immediately) + * - overflow (full, PLUS more bytes in the terminal packet) + * + * So for example, usb-storage sets URB_SHORT_NOT_OK, and would + * thus be a great candidate for using mode 1 ... for all but the + * last packet of one URB's transfer. + */ +static int musb_rx_dma_inventra_cppi41(struct dma_controller *dma, + struct musb_hw_ep *hw_ep, + struct musb_qh *qh, + struct urb *urb, + size_t len) +{ + struct dma_channel *channel = hw_ep->rx_channel; + void __iomem *epio = hw_ep->regs; + u16 val; + int pipe; + bool done; + + pipe = urb->pipe; + + if (usb_pipeisoc(pipe)) { + struct usb_iso_packet_descriptor *d; + + d = urb->iso_frame_desc + qh->iso_idx; + d->actual_length = len; + + /* even if there was an error, we did the dma + * for iso_frame_desc->length + */ + if (d->status != -EILSEQ && d->status != -EOVERFLOW) + d->status = 0; + + if (++qh->iso_idx >= urb->number_of_packets) { + done = true; + } else { + /* REVISIT: Why ignore return value here? */ + if (musb_dma_cppi41(hw_ep->musb)) + done = musb_rx_dma_iso_cppi41(dma, hw_ep, qh, + urb, len); + done = false; + } + + } else { + /* done if urb buffer is full or short packet is recd */ + done = (urb->actual_length + len >= + urb->transfer_buffer_length + || channel->actual_len < qh->maxpacket + || channel->rx_packet_done); + } + + /* send IN token for next packet, without AUTOREQ */ + if (!done) { + val = musb_readw(epio, MUSB_RXCSR); + val |= MUSB_RXCSR_H_REQPKT; + musb_writew(epio, MUSB_RXCSR, MUSB_RXCSR_H_WZC_BITS | val); + } + + return done; +} + +/* Disadvantage of using mode 1: + * It's basically usable only for mass storage class; essentially all + * other protocols also terminate transfers on short packets. + * + * Details: + * An extra IN token is sent at the end of the transfer (due to AUTOREQ) + * If you try to use mode 1 for (transfer_buffer_length - 512), and try + * to use the extra IN token to grab the last packet using mode 0, then + * the problem is that you cannot be sure when the device will send the + * last packet and RxPktRdy set. Sometimes the packet is recd too soon + * such that it gets lost when RxCSR is re-set at the end of the mode 1 + * transfer, while sometimes it is recd just a little late so that if you + * try to configure for mode 0 soon after the mode 1 transfer is + * completed, you will find rxcount 0. Okay, so you might think why not + * wait for an interrupt when the pkt is recd. Well, you won't get any! + */ +static int musb_rx_dma_in_inventra_cppi41(struct dma_controller *dma, + struct musb_hw_ep *hw_ep, + struct musb_qh *qh, + struct urb *urb, + size_t len, + u8 iso_err) +{ + struct musb *musb = hw_ep->musb; + void __iomem *epio = hw_ep->regs; + struct dma_channel *channel = hw_ep->rx_channel; + u16 rx_count, val; + int length, pipe, done; + dma_addr_t buf; + + rx_count = musb_readw(epio, MUSB_RXCOUNT); + pipe = urb->pipe; + + if (usb_pipeisoc(pipe)) { + int d_status = 0; + struct usb_iso_packet_descriptor *d; + + d = urb->iso_frame_desc + qh->iso_idx; + + if (iso_err) { + d_status = -EILSEQ; + urb->error_count++; + } + if (rx_count > d->length) { + if (d_status == 0) { + d_status = -EOVERFLOW; + urb->error_count++; + } + musb_dbg(musb, "** OVERFLOW %d into %d", + rx_count, d->length); + + length = d->length; + } else + length = rx_count; + d->status = d_status; + buf = urb->transfer_dma + d->offset; + } else { + length = rx_count; + buf = urb->transfer_dma + urb->actual_length; + } + + channel->desired_mode = 0; +#ifdef USE_MODE1 + /* because of the issue below, mode 1 will + * only rarely behave with correct semantics. + */ + if ((urb->transfer_flags & URB_SHORT_NOT_OK) + && (urb->transfer_buffer_length - urb->actual_length) + > qh->maxpacket) + channel->desired_mode = 1; + if (rx_count < hw_ep->max_packet_sz_rx) { + length = rx_count; + channel->desired_mode = 0; + } else { + length = urb->transfer_buffer_length; + } +#endif + + /* See comments above on disadvantages of using mode 1 */ + val = musb_readw(epio, MUSB_RXCSR); + val &= ~MUSB_RXCSR_H_REQPKT; + + if (channel->desired_mode == 0) + val &= ~MUSB_RXCSR_H_AUTOREQ; + else + val |= MUSB_RXCSR_H_AUTOREQ; + val |= MUSB_RXCSR_DMAENAB; + + /* autoclear shouldn't be set in high bandwidth */ + if (qh->hb_mult == 1) + val |= MUSB_RXCSR_AUTOCLEAR; + + musb_writew(epio, MUSB_RXCSR, MUSB_RXCSR_H_WZC_BITS | val); + + /* REVISIT if when actual_length != 0, + * transfer_buffer_length needs to be + * adjusted first... + */ + done = dma->channel_program(channel, qh->maxpacket, + channel->desired_mode, + buf, length); + + if (!done) { + dma->channel_release(channel); + hw_ep->rx_channel = NULL; + channel = NULL; + val = musb_readw(epio, MUSB_RXCSR); + val &= ~(MUSB_RXCSR_DMAENAB + | MUSB_RXCSR_H_AUTOREQ + | MUSB_RXCSR_AUTOCLEAR); + musb_writew(epio, MUSB_RXCSR, val); + } + + return done; +} +#else +static inline int musb_rx_dma_inventra_cppi41(struct dma_controller *dma, + struct musb_hw_ep *hw_ep, + struct musb_qh *qh, + struct urb *urb, + size_t len) +{ + return false; +} + +static inline int musb_rx_dma_in_inventra_cppi41(struct dma_controller *dma, + struct musb_hw_ep *hw_ep, + struct musb_qh *qh, + struct urb *urb, + size_t len, + u8 iso_err) +{ + return false; +} +#endif + +/* + * Service an RX interrupt for the given IN endpoint; docs cover bulk, iso, + * and high-bandwidth IN transfer cases. + */ +void musb_host_rx(struct musb *musb, u8 epnum) +{ + struct urb *urb; + struct musb_hw_ep *hw_ep = musb->endpoints + epnum; + struct dma_controller *c = musb->dma_controller; + void __iomem *epio = hw_ep->regs; + struct musb_qh *qh = hw_ep->in_qh; + size_t xfer_len; + void __iomem *mbase = musb->mregs; + u16 rx_csr, val; + bool iso_err = false; + bool done = false; + u32 status; + struct dma_channel *dma; + unsigned int sg_flags = SG_MITER_ATOMIC | SG_MITER_TO_SG; + + musb_ep_select(mbase, epnum); + + urb = next_urb(qh); + dma = is_dma_capable() ? hw_ep->rx_channel : NULL; + status = 0; + xfer_len = 0; + + rx_csr = musb_readw(epio, MUSB_RXCSR); + val = rx_csr; + + if (unlikely(!urb)) { + /* REVISIT -- THIS SHOULD NEVER HAPPEN ... but, at least + * usbtest #11 (unlinks) triggers it regularly, sometimes + * with fifo full. (Only with DMA??) + */ + musb_dbg(musb, "BOGUS RX%d ready, csr %04x, count %d", + epnum, val, musb_readw(epio, MUSB_RXCOUNT)); + musb_h_flush_rxfifo(hw_ep, MUSB_RXCSR_CLRDATATOG); + return; + } + + trace_musb_urb_rx(musb, urb); + + /* check for errors, concurrent stall & unlink is not really + * handled yet! */ + if (rx_csr & MUSB_RXCSR_H_RXSTALL) { + musb_dbg(musb, "RX end %d STALL", epnum); + + /* stall; record URB status */ + status = -EPIPE; + + } else if (rx_csr & MUSB_RXCSR_H_ERROR) { + dev_err(musb->controller, "ep%d RX three-strikes error", epnum); + + /* + * The three-strikes error could only happen when the USB + * device is not accessible, for example detached or powered + * off. So return the fatal error -ESHUTDOWN so hopefully the + * USB device drivers won't immediately resubmit the same URB. + */ + status = -ESHUTDOWN; + musb_writeb(epio, MUSB_RXINTERVAL, 0); + + rx_csr &= ~MUSB_RXCSR_H_ERROR; + musb_writew(epio, MUSB_RXCSR, rx_csr); + + } else if (rx_csr & MUSB_RXCSR_DATAERROR) { + + if (USB_ENDPOINT_XFER_ISOC != qh->type) { + musb_dbg(musb, "RX end %d NAK timeout", epnum); + + /* NOTE: NAKing is *NOT* an error, so we want to + * continue. Except ... if there's a request for + * another QH, use that instead of starving it. + * + * Devices like Ethernet and serial adapters keep + * reads posted at all times, which will starve + * other devices without this logic. + */ + if (usb_pipebulk(urb->pipe) + && qh->mux == 1 + && !list_is_singular(&musb->in_bulk)) { + musb_bulk_nak_timeout(musb, hw_ep, 1); + return; + } + musb_ep_select(mbase, epnum); + rx_csr |= MUSB_RXCSR_H_WZC_BITS; + rx_csr &= ~MUSB_RXCSR_DATAERROR; + musb_writew(epio, MUSB_RXCSR, rx_csr); + + goto finish; + } else { + musb_dbg(musb, "RX end %d ISO data error", epnum); + /* packet error reported later */ + iso_err = true; + } + } else if (rx_csr & MUSB_RXCSR_INCOMPRX) { + musb_dbg(musb, "end %d high bandwidth incomplete ISO packet RX", + epnum); + status = -EPROTO; + } + + /* faults abort the transfer */ + if (status) { + /* clean up dma and collect transfer count */ + if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) { + dma->status = MUSB_DMA_STATUS_CORE_ABORT; + musb->dma_controller->channel_abort(dma); + xfer_len = dma->actual_len; + } + musb_h_flush_rxfifo(hw_ep, MUSB_RXCSR_CLRDATATOG); + musb_writeb(epio, MUSB_RXINTERVAL, 0); + done = true; + goto finish; + } + + if (unlikely(dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY)) { + /* SHOULD NEVER HAPPEN ... but at least DaVinci has done it */ + ERR("RX%d dma busy, csr %04x\n", epnum, rx_csr); + goto finish; + } + + /* thorough shutdown for now ... given more precise fault handling + * and better queueing support, we might keep a DMA pipeline going + * while processing this irq for earlier completions. + */ + + /* FIXME this is _way_ too much in-line logic for Mentor DMA */ + if (!musb_dma_inventra(musb) && !musb_dma_ux500(musb) && + (rx_csr & MUSB_RXCSR_H_REQPKT)) { + /* REVISIT this happened for a while on some short reads... + * the cleanup still needs investigation... looks bad... + * and also duplicates dma cleanup code above ... plus, + * shouldn't this be the "half full" double buffer case? + */ + if (dma_channel_status(dma) == MUSB_DMA_STATUS_BUSY) { + dma->status = MUSB_DMA_STATUS_CORE_ABORT; + musb->dma_controller->channel_abort(dma); + xfer_len = dma->actual_len; + done = true; + } + + musb_dbg(musb, "RXCSR%d %04x, reqpkt, len %zu%s", epnum, rx_csr, + xfer_len, dma ? ", dma" : ""); + rx_csr &= ~MUSB_RXCSR_H_REQPKT; + + musb_ep_select(mbase, epnum); + musb_writew(epio, MUSB_RXCSR, + MUSB_RXCSR_H_WZC_BITS | rx_csr); + } + + if (dma && (rx_csr & MUSB_RXCSR_DMAENAB)) { + xfer_len = dma->actual_len; + + val &= ~(MUSB_RXCSR_DMAENAB + | MUSB_RXCSR_H_AUTOREQ + | MUSB_RXCSR_AUTOCLEAR + | MUSB_RXCSR_RXPKTRDY); + musb_writew(hw_ep->regs, MUSB_RXCSR, val); + + if (musb_dma_inventra(musb) || musb_dma_ux500(musb) || + musb_dma_cppi41(musb)) { + done = musb_rx_dma_inventra_cppi41(c, hw_ep, qh, urb, xfer_len); + musb_dbg(hw_ep->musb, + "ep %d dma %s, rxcsr %04x, rxcount %d", + epnum, done ? "off" : "reset", + musb_readw(epio, MUSB_RXCSR), + musb_readw(epio, MUSB_RXCOUNT)); + } else { + done = true; + } + + } else if (urb->status == -EINPROGRESS) { + /* if no errors, be sure a packet is ready for unloading */ + if (unlikely(!(rx_csr & MUSB_RXCSR_RXPKTRDY))) { + status = -EPROTO; + ERR("Rx interrupt with no errors or packet!\n"); + + /* FIXME this is another "SHOULD NEVER HAPPEN" */ + +/* SCRUB (RX) */ + /* do the proper sequence to abort the transfer */ + musb_ep_select(mbase, epnum); + val &= ~MUSB_RXCSR_H_REQPKT; + musb_writew(epio, MUSB_RXCSR, val); + goto finish; + } + + /* we are expecting IN packets */ + if ((musb_dma_inventra(musb) || musb_dma_ux500(musb) || + musb_dma_cppi41(musb)) && dma) { + musb_dbg(hw_ep->musb, + "RX%d count %d, buffer 0x%llx len %d/%d", + epnum, musb_readw(epio, MUSB_RXCOUNT), + (unsigned long long) urb->transfer_dma + + urb->actual_length, + qh->offset, + urb->transfer_buffer_length); + + if (musb_rx_dma_in_inventra_cppi41(c, hw_ep, qh, urb, + xfer_len, iso_err)) + goto finish; + else + dev_err(musb->controller, "error: rx_dma failed\n"); + } + + if (!dma) { + unsigned int received_len; + + /* Unmap the buffer so that CPU can use it */ + usb_hcd_unmap_urb_for_dma(musb->hcd, urb); + + /* + * We need to map sg if the transfer_buffer is + * NULL. + */ + if (!urb->transfer_buffer) { + qh->use_sg = true; + sg_miter_start(&qh->sg_miter, urb->sg, 1, + sg_flags); + } + + if (qh->use_sg) { + if (!sg_miter_next(&qh->sg_miter)) { + dev_err(musb->controller, "error: sg list empty\n"); + sg_miter_stop(&qh->sg_miter); + status = -EINVAL; + done = true; + goto finish; + } + urb->transfer_buffer = qh->sg_miter.addr; + received_len = urb->actual_length; + qh->offset = 0x0; + done = musb_host_packet_rx(musb, urb, epnum, + iso_err); + /* Calculate the number of bytes received */ + received_len = urb->actual_length - + received_len; + qh->sg_miter.consumed = received_len; + sg_miter_stop(&qh->sg_miter); + } else { + done = musb_host_packet_rx(musb, urb, + epnum, iso_err); + } + musb_dbg(musb, "read %spacket", done ? "last " : ""); + } + } + +finish: + urb->actual_length += xfer_len; + qh->offset += xfer_len; + if (done) { + if (qh->use_sg) { + qh->use_sg = false; + urb->transfer_buffer = NULL; + } + + if (urb->status == -EINPROGRESS) + urb->status = status; + musb_advance_schedule(musb, urb, hw_ep, USB_DIR_IN); + } +} + +/* schedule nodes correspond to peripheral endpoints, like an OHCI QH. + * the software schedule associates multiple such nodes with a given + * host side hardware endpoint + direction; scheduling may activate + * that hardware endpoint. + */ +static int musb_schedule( + struct musb *musb, + struct musb_qh *qh, + int is_in) +{ + int idle = 0; + int best_diff; + int best_end, epnum; + struct musb_hw_ep *hw_ep = NULL; + struct list_head *head = NULL; + u8 toggle; + u8 txtype; + struct urb *urb = next_urb(qh); + + /* use fixed hardware for control and bulk */ + if (qh->type == USB_ENDPOINT_XFER_CONTROL) { + head = &musb->control; + hw_ep = musb->control_ep; + goto success; + } + + /* else, periodic transfers get muxed to other endpoints */ + + /* + * We know this qh hasn't been scheduled, so all we need to do + * is choose which hardware endpoint to put it on ... + * + * REVISIT what we really want here is a regular schedule tree + * like e.g. OHCI uses. + */ + best_diff = 4096; + best_end = -1; + + for (epnum = 1, hw_ep = musb->endpoints + 1; + epnum < musb->nr_endpoints; + epnum++, hw_ep++) { + int diff; + + if (musb_ep_get_qh(hw_ep, is_in) != NULL) + continue; + + if (hw_ep == musb->bulk_ep) + continue; + + if (is_in) + diff = hw_ep->max_packet_sz_rx; + else + diff = hw_ep->max_packet_sz_tx; + diff -= (qh->maxpacket * qh->hb_mult); + + if (diff >= 0 && best_diff > diff) { + + /* + * Mentor controller has a bug in that if we schedule + * a BULK Tx transfer on an endpoint that had earlier + * handled ISOC then the BULK transfer has to start on + * a zero toggle. If the BULK transfer starts on a 1 + * toggle then this transfer will fail as the mentor + * controller starts the Bulk transfer on a 0 toggle + * irrespective of the programming of the toggle bits + * in the TXCSR register. Check for this condition + * while allocating the EP for a Tx Bulk transfer. If + * so skip this EP. + */ + hw_ep = musb->endpoints + epnum; + toggle = usb_gettoggle(urb->dev, qh->epnum, !is_in); + txtype = (musb_readb(hw_ep->regs, MUSB_TXTYPE) + >> 4) & 0x3; + if (!is_in && (qh->type == USB_ENDPOINT_XFER_BULK) && + toggle && (txtype == USB_ENDPOINT_XFER_ISOC)) + continue; + + best_diff = diff; + best_end = epnum; + } + } + /* use bulk reserved ep1 if no other ep is free */ + if (best_end < 0 && qh->type == USB_ENDPOINT_XFER_BULK) { + hw_ep = musb->bulk_ep; + if (is_in) + head = &musb->in_bulk; + else + head = &musb->out_bulk; + + /* Enable bulk RX/TX NAK timeout scheme when bulk requests are + * multiplexed. This scheme does not work in high speed to full + * speed scenario as NAK interrupts are not coming from a + * full speed device connected to a high speed device. + * NAK timeout interval is 8 (128 uframe or 16ms) for HS and + * 4 (8 frame or 8ms) for FS device. + */ + if (qh->dev) + qh->intv_reg = + (USB_SPEED_HIGH == qh->dev->speed) ? 8 : 4; + goto success; + } else if (best_end < 0) { + dev_err(musb->controller, + "%s hwep alloc failed for %dx%d\n", + musb_ep_xfertype_string(qh->type), + qh->hb_mult, qh->maxpacket); + return -ENOSPC; + } + + idle = 1; + qh->mux = 0; + hw_ep = musb->endpoints + best_end; + musb_dbg(musb, "qh %p periodic slot %d", qh, best_end); +success: + if (head) { + idle = list_empty(head); + list_add_tail(&qh->ring, head); + qh->mux = 1; + } + qh->hw_ep = hw_ep; + qh->hep->hcpriv = qh; + if (idle) + musb_start_urb(musb, is_in, qh); + return 0; +} + +static int musb_urb_enqueue( + struct usb_hcd *hcd, + struct urb *urb, + gfp_t mem_flags) +{ + unsigned long flags; + struct musb *musb = hcd_to_musb(hcd); + struct usb_host_endpoint *hep = urb->ep; + struct musb_qh *qh; + struct usb_endpoint_descriptor *epd = &hep->desc; + int ret; + unsigned type_reg; + unsigned interval; + + /* host role must be active */ + if (!is_host_active(musb) || !musb->is_active) + return -ENODEV; + + trace_musb_urb_enq(musb, urb); + + spin_lock_irqsave(&musb->lock, flags); + ret = usb_hcd_link_urb_to_ep(hcd, urb); + qh = ret ? NULL : hep->hcpriv; + if (qh) + urb->hcpriv = qh; + spin_unlock_irqrestore(&musb->lock, flags); + + /* DMA mapping was already done, if needed, and this urb is on + * hep->urb_list now ... so we're done, unless hep wasn't yet + * scheduled onto a live qh. + * + * REVISIT best to keep hep->hcpriv valid until the endpoint gets + * disabled, testing for empty qh->ring and avoiding qh setup costs + * except for the first urb queued after a config change. + */ + if (qh || ret) + return ret; + + /* Allocate and initialize qh, minimizing the work done each time + * hw_ep gets reprogrammed, or with irqs blocked. Then schedule it. + * + * REVISIT consider a dedicated qh kmem_cache, so it's harder + * for bugs in other kernel code to break this driver... + */ + qh = kzalloc(sizeof *qh, mem_flags); + if (!qh) { + spin_lock_irqsave(&musb->lock, flags); + usb_hcd_unlink_urb_from_ep(hcd, urb); + spin_unlock_irqrestore(&musb->lock, flags); + return -ENOMEM; + } + + qh->hep = hep; + qh->dev = urb->dev; + INIT_LIST_HEAD(&qh->ring); + qh->is_ready = 1; + + qh->maxpacket = usb_endpoint_maxp(epd); + qh->type = usb_endpoint_type(epd); + + /* Bits 11 & 12 of wMaxPacketSize encode high bandwidth multiplier. + * Some musb cores don't support high bandwidth ISO transfers; and + * we don't (yet!) support high bandwidth interrupt transfers. + */ + qh->hb_mult = usb_endpoint_maxp_mult(epd); + if (qh->hb_mult > 1) { + int ok = (qh->type == USB_ENDPOINT_XFER_ISOC); + + if (ok) + ok = (usb_pipein(urb->pipe) && musb->hb_iso_rx) + || (usb_pipeout(urb->pipe) && musb->hb_iso_tx); + if (!ok) { + dev_err(musb->controller, + "high bandwidth %s (%dx%d) not supported\n", + musb_ep_xfertype_string(qh->type), + qh->hb_mult, qh->maxpacket & 0x7ff); + ret = -EMSGSIZE; + goto done; + } + qh->maxpacket &= 0x7ff; + } + + qh->epnum = usb_endpoint_num(epd); + + /* NOTE: urb->dev->devnum is wrong during SET_ADDRESS */ + qh->addr_reg = (u8) usb_pipedevice(urb->pipe); + + /* precompute rxtype/txtype/type0 register */ + type_reg = (qh->type << 4) | qh->epnum; + switch (urb->dev->speed) { + case USB_SPEED_LOW: + type_reg |= 0xc0; + break; + case USB_SPEED_FULL: + type_reg |= 0x80; + break; + default: + type_reg |= 0x40; + } + qh->type_reg = type_reg; + + /* Precompute RXINTERVAL/TXINTERVAL register */ + switch (qh->type) { + case USB_ENDPOINT_XFER_INT: + /* + * Full/low speeds use the linear encoding, + * high speed uses the logarithmic encoding. + */ + if (urb->dev->speed <= USB_SPEED_FULL) { + interval = max_t(u8, epd->bInterval, 1); + break; + } + fallthrough; + case USB_ENDPOINT_XFER_ISOC: + /* ISO always uses logarithmic encoding */ + interval = min_t(u8, epd->bInterval, 16); + break; + default: + /* REVISIT we actually want to use NAK limits, hinting to the + * transfer scheduling logic to try some other qh, e.g. try + * for 2 msec first: + * + * interval = (USB_SPEED_HIGH == urb->dev->speed) ? 16 : 2; + * + * The downside of disabling this is that transfer scheduling + * gets VERY unfair for nonperiodic transfers; a misbehaving + * peripheral could make that hurt. That's perfectly normal + * for reads from network or serial adapters ... so we have + * partial NAKlimit support for bulk RX. + * + * The upside of disabling it is simpler transfer scheduling. + */ + interval = 0; + } + qh->intv_reg = interval; + + /* precompute addressing for external hub/tt ports */ + if (musb->is_multipoint) { + struct usb_device *parent = urb->dev->parent; + + if (parent != hcd->self.root_hub) { + qh->h_addr_reg = (u8) parent->devnum; + + /* set up tt info if needed */ + if (urb->dev->tt) { + qh->h_port_reg = (u8) urb->dev->ttport; + if (urb->dev->tt->hub) + qh->h_addr_reg = + (u8) urb->dev->tt->hub->devnum; + if (urb->dev->tt->multi) + qh->h_addr_reg |= 0x80; + } + } + } + + /* invariant: hep->hcpriv is null OR the qh that's already scheduled. + * until we get real dma queues (with an entry for each urb/buffer), + * we only have work to do in the former case. + */ + spin_lock_irqsave(&musb->lock, flags); + if (hep->hcpriv || !next_urb(qh)) { + /* some concurrent activity submitted another urb to hep... + * odd, rare, error prone, but legal. + */ + kfree(qh); + qh = NULL; + ret = 0; + } else + ret = musb_schedule(musb, qh, + epd->bEndpointAddress & USB_ENDPOINT_DIR_MASK); + + if (ret == 0) { + urb->hcpriv = qh; + /* FIXME set urb->start_frame for iso/intr, it's tested in + * musb_start_urb(), but otherwise only konicawc cares ... + */ + } + spin_unlock_irqrestore(&musb->lock, flags); + +done: + if (ret != 0) { + spin_lock_irqsave(&musb->lock, flags); + usb_hcd_unlink_urb_from_ep(hcd, urb); + spin_unlock_irqrestore(&musb->lock, flags); + kfree(qh); + } + return ret; +} + + +/* + * abort a transfer that's at the head of a hardware queue. + * called with controller locked, irqs blocked + * that hardware queue advances to the next transfer, unless prevented + */ +static int musb_cleanup_urb(struct urb *urb, struct musb_qh *qh) +{ + struct musb_hw_ep *ep = qh->hw_ep; + struct musb *musb = ep->musb; + void __iomem *epio = ep->regs; + unsigned hw_end = ep->epnum; + void __iomem *regs = ep->musb->mregs; + int is_in = usb_pipein(urb->pipe); + int status = 0; + u16 csr; + struct dma_channel *dma = NULL; + + musb_ep_select(regs, hw_end); + + if (is_dma_capable()) { + dma = is_in ? ep->rx_channel : ep->tx_channel; + if (dma) { + status = ep->musb->dma_controller->channel_abort(dma); + musb_dbg(musb, "abort %cX%d DMA for urb %p --> %d", + is_in ? 'R' : 'T', ep->epnum, + urb, status); + urb->actual_length += dma->actual_len; + } + } + + /* turn off DMA requests, discard state, stop polling ... */ + if (ep->epnum && is_in) { + /* giveback saves bulk toggle */ + csr = musb_h_flush_rxfifo(ep, 0); + + /* clear the endpoint's irq status here to avoid bogus irqs */ + if (is_dma_capable() && dma) + musb_platform_clear_ep_rxintr(musb, ep->epnum); + } else if (ep->epnum) { + musb_h_tx_flush_fifo(ep); + csr = musb_readw(epio, MUSB_TXCSR); + csr &= ~(MUSB_TXCSR_AUTOSET + | MUSB_TXCSR_DMAENAB + | MUSB_TXCSR_H_RXSTALL + | MUSB_TXCSR_H_NAKTIMEOUT + | MUSB_TXCSR_H_ERROR + | MUSB_TXCSR_TXPKTRDY); + musb_writew(epio, MUSB_TXCSR, csr); + /* REVISIT may need to clear FLUSHFIFO ... */ + musb_writew(epio, MUSB_TXCSR, csr); + /* flush cpu writebuffer */ + csr = musb_readw(epio, MUSB_TXCSR); + } else { + musb_h_ep0_flush_fifo(ep); + } + if (status == 0) + musb_advance_schedule(ep->musb, urb, ep, is_in); + return status; +} + +static int musb_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) +{ + struct musb *musb = hcd_to_musb(hcd); + struct musb_qh *qh; + unsigned long flags; + int is_in = usb_pipein(urb->pipe); + int ret; + + trace_musb_urb_deq(musb, urb); + + spin_lock_irqsave(&musb->lock, flags); + ret = usb_hcd_check_unlink_urb(hcd, urb, status); + if (ret) + goto done; + + qh = urb->hcpriv; + if (!qh) + goto done; + + /* + * Any URB not actively programmed into endpoint hardware can be + * immediately given back; that's any URB not at the head of an + * endpoint queue, unless someday we get real DMA queues. And even + * if it's at the head, it might not be known to the hardware... + * + * Otherwise abort current transfer, pending DMA, etc.; urb->status + * has already been updated. This is a synchronous abort; it'd be + * OK to hold off until after some IRQ, though. + * + * NOTE: qh is invalid unless !list_empty(&hep->urb_list) + */ + if (!qh->is_ready + || urb->urb_list.prev != &qh->hep->urb_list + || musb_ep_get_qh(qh->hw_ep, is_in) != qh) { + int ready = qh->is_ready; + + qh->is_ready = 0; + musb_giveback(musb, urb, 0); + qh->is_ready = ready; + + /* If nothing else (usually musb_giveback) is using it + * and its URB list has emptied, recycle this qh. + */ + if (ready && list_empty(&qh->hep->urb_list)) { + musb_ep_set_qh(qh->hw_ep, is_in, NULL); + qh->hep->hcpriv = NULL; + list_del(&qh->ring); + kfree(qh); + } + } else + ret = musb_cleanup_urb(urb, qh); +done: + spin_unlock_irqrestore(&musb->lock, flags); + return ret; +} + +/* disable an endpoint */ +static void +musb_h_disable(struct usb_hcd *hcd, struct usb_host_endpoint *hep) +{ + u8 is_in = hep->desc.bEndpointAddress & USB_DIR_IN; + unsigned long flags; + struct musb *musb = hcd_to_musb(hcd); + struct musb_qh *qh; + struct urb *urb; + + spin_lock_irqsave(&musb->lock, flags); + + qh = hep->hcpriv; + if (qh == NULL) + goto exit; + + /* NOTE: qh is invalid unless !list_empty(&hep->urb_list) */ + + /* Kick the first URB off the hardware, if needed */ + qh->is_ready = 0; + if (musb_ep_get_qh(qh->hw_ep, is_in) == qh) { + urb = next_urb(qh); + + /* make software (then hardware) stop ASAP */ + if (!urb->unlinked) + urb->status = -ESHUTDOWN; + + /* cleanup */ + musb_cleanup_urb(urb, qh); + + /* Then nuke all the others ... and advance the + * queue on hw_ep (e.g. bulk ring) when we're done. + */ + while (!list_empty(&hep->urb_list)) { + urb = next_urb(qh); + urb->status = -ESHUTDOWN; + musb_advance_schedule(musb, urb, qh->hw_ep, is_in); + } + } else { + /* Just empty the queue; the hardware is busy with + * other transfers, and since !qh->is_ready nothing + * will activate any of these as it advances. + */ + while (!list_empty(&hep->urb_list)) + musb_giveback(musb, next_urb(qh), -ESHUTDOWN); + + hep->hcpriv = NULL; + list_del(&qh->ring); + kfree(qh); + } +exit: + spin_unlock_irqrestore(&musb->lock, flags); +} + +static int musb_h_get_frame_number(struct usb_hcd *hcd) +{ + struct musb *musb = hcd_to_musb(hcd); + + return musb_readw(musb->mregs, MUSB_FRAME); +} + +static int musb_h_start(struct usb_hcd *hcd) +{ + struct musb *musb = hcd_to_musb(hcd); + + /* NOTE: musb_start() is called when the hub driver turns + * on port power, or when (OTG) peripheral starts. + */ + hcd->state = HC_STATE_RUNNING; + musb->port1_status = 0; + return 0; +} + +static void musb_h_stop(struct usb_hcd *hcd) +{ + musb_stop(hcd_to_musb(hcd)); + hcd->state = HC_STATE_HALT; +} + +static int musb_bus_suspend(struct usb_hcd *hcd) +{ + struct musb *musb = hcd_to_musb(hcd); + u8 devctl; + int ret; + + ret = musb_port_suspend(musb, true); + if (ret) + return ret; + + if (!is_host_active(musb)) + return 0; + + switch (musb->xceiv->otg->state) { + case OTG_STATE_A_SUSPEND: + return 0; + case OTG_STATE_A_WAIT_VRISE: + /* ID could be grounded even if there's no device + * on the other end of the cable. NOTE that the + * A_WAIT_VRISE timers are messy with MUSB... + */ + devctl = musb_readb(musb->mregs, MUSB_DEVCTL); + if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS) + musb->xceiv->otg->state = OTG_STATE_A_WAIT_BCON; + break; + default: + break; + } + + if (musb->is_active) { + WARNING("trying to suspend as %s while active\n", + usb_otg_state_string(musb->xceiv->otg->state)); + return -EBUSY; + } else + return 0; +} + +static int musb_bus_resume(struct usb_hcd *hcd) +{ + struct musb *musb = hcd_to_musb(hcd); + + if (musb->config && + musb->config->host_port_deassert_reset_at_resume) + musb_port_reset(musb, false); + + return 0; +} + +#ifndef CONFIG_MUSB_PIO_ONLY + +#define MUSB_USB_DMA_ALIGN 4 + +struct musb_temp_buffer { + void *kmalloc_ptr; + void *old_xfer_buffer; + u8 data[]; +}; + +static void musb_free_temp_buffer(struct urb *urb) +{ + enum dma_data_direction dir; + struct musb_temp_buffer *temp; + size_t length; + + if (!(urb->transfer_flags & URB_ALIGNED_TEMP_BUFFER)) + return; + + dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE; + + temp = container_of(urb->transfer_buffer, struct musb_temp_buffer, + data); + + if (dir == DMA_FROM_DEVICE) { + if (usb_pipeisoc(urb->pipe)) + length = urb->transfer_buffer_length; + else + length = urb->actual_length; + + memcpy(temp->old_xfer_buffer, temp->data, length); + } + urb->transfer_buffer = temp->old_xfer_buffer; + kfree(temp->kmalloc_ptr); + + urb->transfer_flags &= ~URB_ALIGNED_TEMP_BUFFER; +} + +static int musb_alloc_temp_buffer(struct urb *urb, gfp_t mem_flags) +{ + enum dma_data_direction dir; + struct musb_temp_buffer *temp; + void *kmalloc_ptr; + size_t kmalloc_size; + + if (urb->num_sgs || urb->sg || + urb->transfer_buffer_length == 0 || + !((uintptr_t)urb->transfer_buffer & (MUSB_USB_DMA_ALIGN - 1))) + return 0; + + dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE; + + /* Allocate a buffer with enough padding for alignment */ + kmalloc_size = urb->transfer_buffer_length + + sizeof(struct musb_temp_buffer) + MUSB_USB_DMA_ALIGN - 1; + + kmalloc_ptr = kmalloc(kmalloc_size, mem_flags); + if (!kmalloc_ptr) + return -ENOMEM; + + /* Position our struct temp_buffer such that data is aligned */ + temp = PTR_ALIGN(kmalloc_ptr, MUSB_USB_DMA_ALIGN); + + + temp->kmalloc_ptr = kmalloc_ptr; + temp->old_xfer_buffer = urb->transfer_buffer; + if (dir == DMA_TO_DEVICE) + memcpy(temp->data, urb->transfer_buffer, + urb->transfer_buffer_length); + urb->transfer_buffer = temp->data; + + urb->transfer_flags |= URB_ALIGNED_TEMP_BUFFER; + + return 0; +} + +static int musb_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb, + gfp_t mem_flags) +{ + struct musb *musb = hcd_to_musb(hcd); + int ret; + + /* + * The DMA engine in RTL1.8 and above cannot handle + * DMA addresses that are not aligned to a 4 byte boundary. + * For such engine implemented (un)map_urb_for_dma hooks. + * Do not use these hooks for RTL<1.8 + */ + if (musb->hwvers < MUSB_HWVERS_1800) + return usb_hcd_map_urb_for_dma(hcd, urb, mem_flags); + + ret = musb_alloc_temp_buffer(urb, mem_flags); + if (ret) + return ret; + + ret = usb_hcd_map_urb_for_dma(hcd, urb, mem_flags); + if (ret) + musb_free_temp_buffer(urb); + + return ret; +} + +static void musb_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb) +{ + struct musb *musb = hcd_to_musb(hcd); + + usb_hcd_unmap_urb_for_dma(hcd, urb); + + /* Do not use this hook for RTL<1.8 (see description above) */ + if (musb->hwvers < MUSB_HWVERS_1800) + return; + + musb_free_temp_buffer(urb); +} +#endif /* !CONFIG_MUSB_PIO_ONLY */ + +static const struct hc_driver musb_hc_driver = { + .description = "musb-hcd", + .product_desc = "MUSB HDRC host driver", + .hcd_priv_size = sizeof(struct musb *), + .flags = HCD_USB2 | HCD_DMA | HCD_MEMORY, + + /* not using irq handler or reset hooks from usbcore, since + * those must be shared with peripheral code for OTG configs + */ + + .start = musb_h_start, + .stop = musb_h_stop, + + .get_frame_number = musb_h_get_frame_number, + + .urb_enqueue = musb_urb_enqueue, + .urb_dequeue = musb_urb_dequeue, + .endpoint_disable = musb_h_disable, + +#ifndef CONFIG_MUSB_PIO_ONLY + .map_urb_for_dma = musb_map_urb_for_dma, + .unmap_urb_for_dma = musb_unmap_urb_for_dma, +#endif + + .hub_status_data = musb_hub_status_data, + .hub_control = musb_hub_control, + .bus_suspend = musb_bus_suspend, + .bus_resume = musb_bus_resume, + /* .start_port_reset = NULL, */ + /* .hub_irq_enable = NULL, */ +}; + +int musb_host_alloc(struct musb *musb) +{ + struct device *dev = musb->controller; + + /* usbcore sets dev->driver_data to hcd, and sometimes uses that... */ + musb->hcd = usb_create_hcd(&musb_hc_driver, dev, dev_name(dev)); + if (!musb->hcd) + return -EINVAL; + + *musb->hcd->hcd_priv = (unsigned long) musb; + musb->hcd->self.uses_pio_for_control = 1; + musb->hcd->uses_new_polling = 1; + musb->hcd->has_tt = 1; + + return 0; +} + +void musb_host_cleanup(struct musb *musb) +{ + if (musb->port_mode == MUSB_PERIPHERAL) + return; + usb_remove_hcd(musb->hcd); +} + +void musb_host_free(struct musb *musb) +{ + usb_put_hcd(musb->hcd); +} + +int musb_host_setup(struct musb *musb, int power_budget) +{ + int ret; + struct usb_hcd *hcd = musb->hcd; + + if (musb->port_mode == MUSB_HOST) { + MUSB_HST_MODE(musb); + musb->xceiv->otg->state = OTG_STATE_A_IDLE; + } + otg_set_host(musb->xceiv->otg, &hcd->self); + /* don't support otg protocols */ + hcd->self.otg_port = 0; + musb->xceiv->otg->host = &hcd->self; + hcd->power_budget = 2 * (power_budget ? : 250); + hcd->skip_phy_initialization = 1; + + ret = usb_add_hcd(hcd, 0, 0); + if (ret < 0) + return ret; + + device_wakeup_enable(hcd->self.controller); + return 0; +} + +void musb_host_resume_root_hub(struct musb *musb) +{ + usb_hcd_resume_root_hub(musb->hcd); +} + +void musb_host_poke_root_hub(struct musb *musb) +{ + MUSB_HST_MODE(musb); + if (musb->hcd->status_urb) + usb_hcd_poll_rh_status(musb->hcd); + else + usb_hcd_resume_root_hub(musb->hcd); +} |