From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- drivers/usb/gadget/udc/goku_udc.c | 1860 +++++++++++++++++++++++++++++++++++++ 1 file changed, 1860 insertions(+) create mode 100644 drivers/usb/gadget/udc/goku_udc.c (limited to 'drivers/usb/gadget/udc/goku_udc.c') diff --git a/drivers/usb/gadget/udc/goku_udc.c b/drivers/usb/gadget/udc/goku_udc.c new file mode 100644 index 000000000..5ffb3d5c6 --- /dev/null +++ b/drivers/usb/gadget/udc/goku_udc.c @@ -0,0 +1,1860 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Toshiba TC86C001 ("Goku-S") USB Device Controller driver + * + * Copyright (C) 2000-2002 Lineo + * by Stuart Lynne, Tom Rushworth, and Bruce Balden + * Copyright (C) 2002 Toshiba Corporation + * Copyright (C) 2003 MontaVista Software (source@mvista.com) + */ + +/* + * This device has ep0 and three semi-configurable bulk/interrupt endpoints. + * + * - Endpoint numbering is fixed: ep{1,2,3}-bulk + * - Gadget drivers can choose ep maxpacket (8/16/32/64) + * - Gadget drivers can choose direction (IN, OUT) + * - DMA works with ep1 (OUT transfers) and ep2 (IN transfers). + */ + +// #define VERBOSE /* extra debug messages (success too) */ +// #define USB_TRACE /* packet-level success messages */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include + + +#include "goku_udc.h" + +#define DRIVER_DESC "TC86C001 USB Device Controller" +#define DRIVER_VERSION "30-Oct 2003" + +static const char driver_name [] = "goku_udc"; +static const char driver_desc [] = DRIVER_DESC; + +MODULE_AUTHOR("source@mvista.com"); +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_LICENSE("GPL"); + + +/* + * IN dma behaves ok under testing, though the IN-dma abort paths don't + * seem to behave quite as expected. Used by default. + * + * OUT dma documents design problems handling the common "short packet" + * transfer termination policy; it couldn't be enabled by default, even + * if the OUT-dma abort problems had a resolution. + */ +static unsigned use_dma = 1; + +#if 0 +//#include +/* "modprobe goku_udc use_dma=1" etc + * 0 to disable dma + * 1 to use IN dma only (normal operation) + * 2 to use IN and OUT dma + */ +module_param(use_dma, uint, S_IRUGO); +#endif + +/*-------------------------------------------------------------------------*/ + +static void nuke(struct goku_ep *, int status); + +static inline void +command(struct goku_udc_regs __iomem *regs, int command, unsigned epnum) +{ + writel(COMMAND_EP(epnum) | command, ®s->Command); + udelay(300); +} + +static int +goku_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc) +{ + struct goku_udc *dev; + struct goku_ep *ep; + u32 mode; + u16 max; + unsigned long flags; + + ep = container_of(_ep, struct goku_ep, ep); + if (!_ep || !desc + || desc->bDescriptorType != USB_DT_ENDPOINT) + return -EINVAL; + dev = ep->dev; + if (ep == &dev->ep[0]) + return -EINVAL; + if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) + return -ESHUTDOWN; + if (ep->num != usb_endpoint_num(desc)) + return -EINVAL; + + switch (usb_endpoint_type(desc)) { + case USB_ENDPOINT_XFER_BULK: + case USB_ENDPOINT_XFER_INT: + break; + default: + return -EINVAL; + } + + if ((readl(ep->reg_status) & EPxSTATUS_EP_MASK) + != EPxSTATUS_EP_INVALID) + return -EBUSY; + + /* enabling the no-toggle interrupt mode would need an api hook */ + mode = 0; + max = get_unaligned_le16(&desc->wMaxPacketSize); + switch (max) { + case 64: + mode++; + fallthrough; + case 32: + mode++; + fallthrough; + case 16: + mode++; + fallthrough; + case 8: + mode <<= 3; + break; + default: + return -EINVAL; + } + mode |= 2 << 1; /* bulk, or intr-with-toggle */ + + /* ep1/ep2 dma direction is chosen early; it works in the other + * direction, with pio. be cautious with out-dma. + */ + ep->is_in = usb_endpoint_dir_in(desc); + if (ep->is_in) { + mode |= 1; + ep->dma = (use_dma != 0) && (ep->num == UDC_MSTRD_ENDPOINT); + } else { + ep->dma = (use_dma == 2) && (ep->num == UDC_MSTWR_ENDPOINT); + if (ep->dma) + DBG(dev, "%s out-dma hides short packets\n", + ep->ep.name); + } + + spin_lock_irqsave(&ep->dev->lock, flags); + + /* ep1 and ep2 can do double buffering and/or dma */ + if (ep->num < 3) { + struct goku_udc_regs __iomem *regs = ep->dev->regs; + u32 tmp; + + /* double buffer except (for now) with pio in */ + tmp = ((ep->dma || !ep->is_in) + ? 0x10 /* double buffered */ + : 0x11 /* single buffer */ + ) << ep->num; + tmp |= readl(®s->EPxSingle); + writel(tmp, ®s->EPxSingle); + + tmp = (ep->dma ? 0x10/*dma*/ : 0x11/*pio*/) << ep->num; + tmp |= readl(®s->EPxBCS); + writel(tmp, ®s->EPxBCS); + } + writel(mode, ep->reg_mode); + command(ep->dev->regs, COMMAND_RESET, ep->num); + ep->ep.maxpacket = max; + ep->stopped = 0; + ep->ep.desc = desc; + spin_unlock_irqrestore(&ep->dev->lock, flags); + + DBG(dev, "enable %s %s %s maxpacket %u\n", ep->ep.name, + ep->is_in ? "IN" : "OUT", + ep->dma ? "dma" : "pio", + max); + + return 0; +} + +static void ep_reset(struct goku_udc_regs __iomem *regs, struct goku_ep *ep) +{ + struct goku_udc *dev = ep->dev; + + if (regs) { + command(regs, COMMAND_INVALID, ep->num); + if (ep->num) { + if (ep->num == UDC_MSTWR_ENDPOINT) + dev->int_enable &= ~(INT_MSTWREND + |INT_MSTWRTMOUT); + else if (ep->num == UDC_MSTRD_ENDPOINT) + dev->int_enable &= ~INT_MSTRDEND; + dev->int_enable &= ~INT_EPxDATASET (ep->num); + } else + dev->int_enable &= ~INT_EP0; + writel(dev->int_enable, ®s->int_enable); + readl(®s->int_enable); + if (ep->num < 3) { + struct goku_udc_regs __iomem *r = ep->dev->regs; + u32 tmp; + + tmp = readl(&r->EPxSingle); + tmp &= ~(0x11 << ep->num); + writel(tmp, &r->EPxSingle); + + tmp = readl(&r->EPxBCS); + tmp &= ~(0x11 << ep->num); + writel(tmp, &r->EPxBCS); + } + /* reset dma in case we're still using it */ + if (ep->dma) { + u32 master; + + master = readl(®s->dma_master) & MST_RW_BITS; + if (ep->num == UDC_MSTWR_ENDPOINT) { + master &= ~MST_W_BITS; + master |= MST_WR_RESET; + } else { + master &= ~MST_R_BITS; + master |= MST_RD_RESET; + } + writel(master, ®s->dma_master); + } + } + + usb_ep_set_maxpacket_limit(&ep->ep, MAX_FIFO_SIZE); + ep->ep.desc = NULL; + ep->stopped = 1; + ep->irqs = 0; + ep->dma = 0; +} + +static int goku_ep_disable(struct usb_ep *_ep) +{ + struct goku_ep *ep; + struct goku_udc *dev; + unsigned long flags; + + ep = container_of(_ep, struct goku_ep, ep); + if (!_ep || !ep->ep.desc) + return -ENODEV; + dev = ep->dev; + if (dev->ep0state == EP0_SUSPEND) + return -EBUSY; + + VDBG(dev, "disable %s\n", _ep->name); + + spin_lock_irqsave(&dev->lock, flags); + nuke(ep, -ESHUTDOWN); + ep_reset(dev->regs, ep); + spin_unlock_irqrestore(&dev->lock, flags); + + return 0; +} + +/*-------------------------------------------------------------------------*/ + +static struct usb_request * +goku_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags) +{ + struct goku_request *req; + + if (!_ep) + return NULL; + req = kzalloc(sizeof *req, gfp_flags); + if (!req) + return NULL; + + INIT_LIST_HEAD(&req->queue); + return &req->req; +} + +static void +goku_free_request(struct usb_ep *_ep, struct usb_request *_req) +{ + struct goku_request *req; + + if (!_ep || !_req) + return; + + req = container_of(_req, struct goku_request, req); + WARN_ON(!list_empty(&req->queue)); + kfree(req); +} + +/*-------------------------------------------------------------------------*/ + +static void +done(struct goku_ep *ep, struct goku_request *req, int status) +{ + struct goku_udc *dev; + unsigned stopped = ep->stopped; + + list_del_init(&req->queue); + + if (likely(req->req.status == -EINPROGRESS)) + req->req.status = status; + else + status = req->req.status; + + dev = ep->dev; + + if (ep->dma) + usb_gadget_unmap_request(&dev->gadget, &req->req, ep->is_in); + +#ifndef USB_TRACE + if (status && status != -ESHUTDOWN) +#endif + VDBG(dev, "complete %s req %p stat %d len %u/%u\n", + ep->ep.name, &req->req, status, + req->req.actual, req->req.length); + + /* don't modify queue heads during completion callback */ + ep->stopped = 1; + spin_unlock(&dev->lock); + usb_gadget_giveback_request(&ep->ep, &req->req); + spin_lock(&dev->lock); + ep->stopped = stopped; +} + +/*-------------------------------------------------------------------------*/ + +static inline int +write_packet(u32 __iomem *fifo, u8 *buf, struct goku_request *req, unsigned max) +{ + unsigned length, count; + + length = min(req->req.length - req->req.actual, max); + req->req.actual += length; + + count = length; + while (likely(count--)) + writel(*buf++, fifo); + return length; +} + +// return: 0 = still running, 1 = completed, negative = errno +static int write_fifo(struct goku_ep *ep, struct goku_request *req) +{ + struct goku_udc *dev = ep->dev; + u32 tmp; + u8 *buf; + unsigned count; + int is_last; + + tmp = readl(&dev->regs->DataSet); + buf = req->req.buf + req->req.actual; + prefetch(buf); + + dev = ep->dev; + if (unlikely(ep->num == 0 && dev->ep0state != EP0_IN)) + return -EL2HLT; + + /* NOTE: just single-buffered PIO-IN for now. */ + if (unlikely((tmp & DATASET_A(ep->num)) != 0)) + return 0; + + /* clear our "packet available" irq */ + if (ep->num != 0) + writel(~INT_EPxDATASET(ep->num), &dev->regs->int_status); + + count = write_packet(ep->reg_fifo, buf, req, ep->ep.maxpacket); + + /* last packet often short (sometimes a zlp, especially on ep0) */ + if (unlikely(count != ep->ep.maxpacket)) { + writel(~(1<num), &dev->regs->EOP); + if (ep->num == 0) { + dev->ep[0].stopped = 1; + dev->ep0state = EP0_STATUS; + } + is_last = 1; + } else { + if (likely(req->req.length != req->req.actual) + || req->req.zero) + is_last = 0; + else + is_last = 1; + } +#if 0 /* printk seemed to trash is_last...*/ +//#ifdef USB_TRACE + VDBG(dev, "wrote %s %u bytes%s IN %u left %p\n", + ep->ep.name, count, is_last ? "/last" : "", + req->req.length - req->req.actual, req); +#endif + + /* requests complete when all IN data is in the FIFO, + * or sometimes later, if a zlp was needed. + */ + if (is_last) { + done(ep, req, 0); + return 1; + } + + return 0; +} + +static int read_fifo(struct goku_ep *ep, struct goku_request *req) +{ + struct goku_udc_regs __iomem *regs; + u32 size, set; + u8 *buf; + unsigned bufferspace, is_short, dbuff; + + regs = ep->dev->regs; +top: + buf = req->req.buf + req->req.actual; + prefetchw(buf); + + if (unlikely(ep->num == 0 && ep->dev->ep0state != EP0_OUT)) + return -EL2HLT; + + dbuff = (ep->num == 1 || ep->num == 2); + do { + /* ack dataset irq matching the status we'll handle */ + if (ep->num != 0) + writel(~INT_EPxDATASET(ep->num), ®s->int_status); + + set = readl(®s->DataSet) & DATASET_AB(ep->num); + size = readl(®s->EPxSizeLA[ep->num]); + bufferspace = req->req.length - req->req.actual; + + /* usually do nothing without an OUT packet */ + if (likely(ep->num != 0 || bufferspace != 0)) { + if (unlikely(set == 0)) + break; + /* use ep1/ep2 double-buffering for OUT */ + if (!(size & PACKET_ACTIVE)) + size = readl(®s->EPxSizeLB[ep->num]); + if (!(size & PACKET_ACTIVE)) /* "can't happen" */ + break; + size &= DATASIZE; /* EPxSizeH == 0 */ + + /* ep0out no-out-data case for set_config, etc */ + } else + size = 0; + + /* read all bytes from this packet */ + req->req.actual += size; + is_short = (size < ep->ep.maxpacket); +#ifdef USB_TRACE + VDBG(ep->dev, "read %s %u bytes%s OUT req %p %u/%u\n", + ep->ep.name, size, is_short ? "/S" : "", + req, req->req.actual, req->req.length); +#endif + while (likely(size-- != 0)) { + u8 byte = (u8) readl(ep->reg_fifo); + + if (unlikely(bufferspace == 0)) { + /* this happens when the driver's buffer + * is smaller than what the host sent. + * discard the extra data in this packet. + */ + if (req->req.status != -EOVERFLOW) + DBG(ep->dev, "%s overflow %u\n", + ep->ep.name, size); + req->req.status = -EOVERFLOW; + } else { + *buf++ = byte; + bufferspace--; + } + } + + /* completion */ + if (unlikely(is_short || req->req.actual == req->req.length)) { + if (unlikely(ep->num == 0)) { + /* non-control endpoints now usable? */ + if (ep->dev->req_config) + writel(ep->dev->configured + ? USBSTATE_CONFIGURED + : 0, + ®s->UsbState); + /* ep0out status stage */ + writel(~(1<<0), ®s->EOP); + ep->stopped = 1; + ep->dev->ep0state = EP0_STATUS; + } + done(ep, req, 0); + + /* empty the second buffer asap */ + if (dbuff && !list_empty(&ep->queue)) { + req = list_entry(ep->queue.next, + struct goku_request, queue); + goto top; + } + return 1; + } + } while (dbuff); + return 0; +} + +static inline void +pio_irq_enable(struct goku_udc *dev, + struct goku_udc_regs __iomem *regs, int epnum) +{ + dev->int_enable |= INT_EPxDATASET (epnum); + writel(dev->int_enable, ®s->int_enable); + /* write may still be posted */ +} + +static inline void +pio_irq_disable(struct goku_udc *dev, + struct goku_udc_regs __iomem *regs, int epnum) +{ + dev->int_enable &= ~INT_EPxDATASET (epnum); + writel(dev->int_enable, ®s->int_enable); + /* write may still be posted */ +} + +static inline void +pio_advance(struct goku_ep *ep) +{ + struct goku_request *req; + + if (unlikely(list_empty (&ep->queue))) + return; + req = list_entry(ep->queue.next, struct goku_request, queue); + (ep->is_in ? write_fifo : read_fifo)(ep, req); +} + + +/*-------------------------------------------------------------------------*/ + +// return: 0 = q running, 1 = q stopped, negative = errno +static int start_dma(struct goku_ep *ep, struct goku_request *req) +{ + struct goku_udc_regs __iomem *regs = ep->dev->regs; + u32 master; + u32 start = req->req.dma; + u32 end = start + req->req.length - 1; + + master = readl(®s->dma_master) & MST_RW_BITS; + + /* re-init the bits affecting IN dma; careful with zlps */ + if (likely(ep->is_in)) { + if (unlikely(master & MST_RD_ENA)) { + DBG (ep->dev, "start, IN active dma %03x!!\n", + master); +// return -EL2HLT; + } + writel(end, ®s->in_dma_end); + writel(start, ®s->in_dma_start); + + master &= ~MST_R_BITS; + if (unlikely(req->req.length == 0)) + master |= MST_RD_ENA | MST_RD_EOPB; + else if ((req->req.length % ep->ep.maxpacket) != 0 + || req->req.zero) + master |= MST_RD_ENA | MST_EOPB_ENA; + else + master |= MST_RD_ENA | MST_EOPB_DIS; + + ep->dev->int_enable |= INT_MSTRDEND; + + /* Goku DMA-OUT merges short packets, which plays poorly with + * protocols where short packets mark the transfer boundaries. + * The chip supports a nonstandard policy with INT_MSTWRTMOUT, + * ending transfers after 3 SOFs; we don't turn it on. + */ + } else { + if (unlikely(master & MST_WR_ENA)) { + DBG (ep->dev, "start, OUT active dma %03x!!\n", + master); +// return -EL2HLT; + } + writel(end, ®s->out_dma_end); + writel(start, ®s->out_dma_start); + + master &= ~MST_W_BITS; + master |= MST_WR_ENA | MST_TIMEOUT_DIS; + + ep->dev->int_enable |= INT_MSTWREND|INT_MSTWRTMOUT; + } + + writel(master, ®s->dma_master); + writel(ep->dev->int_enable, ®s->int_enable); + return 0; +} + +static void dma_advance(struct goku_udc *dev, struct goku_ep *ep) +{ + struct goku_request *req; + struct goku_udc_regs __iomem *regs = ep->dev->regs; + u32 master; + + master = readl(®s->dma_master); + + if (unlikely(list_empty(&ep->queue))) { +stop: + if (ep->is_in) + dev->int_enable &= ~INT_MSTRDEND; + else + dev->int_enable &= ~(INT_MSTWREND|INT_MSTWRTMOUT); + writel(dev->int_enable, ®s->int_enable); + return; + } + req = list_entry(ep->queue.next, struct goku_request, queue); + + /* normal hw dma completion (not abort) */ + if (likely(ep->is_in)) { + if (unlikely(master & MST_RD_ENA)) + return; + req->req.actual = readl(®s->in_dma_current); + } else { + if (unlikely(master & MST_WR_ENA)) + return; + + /* hardware merges short packets, and also hides packet + * overruns. a partial packet MAY be in the fifo here. + */ + req->req.actual = readl(®s->out_dma_current); + } + req->req.actual -= req->req.dma; + req->req.actual++; + +#ifdef USB_TRACE + VDBG(dev, "done %s %s dma, %u/%u bytes, req %p\n", + ep->ep.name, ep->is_in ? "IN" : "OUT", + req->req.actual, req->req.length, req); +#endif + done(ep, req, 0); + if (list_empty(&ep->queue)) + goto stop; + req = list_entry(ep->queue.next, struct goku_request, queue); + (void) start_dma(ep, req); +} + +static void abort_dma(struct goku_ep *ep, int status) +{ + struct goku_udc_regs __iomem *regs = ep->dev->regs; + struct goku_request *req; + u32 curr, master; + + /* NAK future host requests, hoping the implicit delay lets the + * dma engine finish reading (or writing) its latest packet and + * empty the dma buffer (up to 16 bytes). + * + * This avoids needing to clean up a partial packet in the fifo; + * we can't do that for IN without side effects to HALT and TOGGLE. + */ + command(regs, COMMAND_FIFO_DISABLE, ep->num); + req = list_entry(ep->queue.next, struct goku_request, queue); + master = readl(®s->dma_master) & MST_RW_BITS; + + /* FIXME using these resets isn't usably documented. this may + * not work unless it's followed by disabling the endpoint. + * + * FIXME the OUT reset path doesn't even behave consistently. + */ + if (ep->is_in) { + if (unlikely((readl(®s->dma_master) & MST_RD_ENA) == 0)) + goto finished; + curr = readl(®s->in_dma_current); + + writel(curr, ®s->in_dma_end); + writel(curr, ®s->in_dma_start); + + master &= ~MST_R_BITS; + master |= MST_RD_RESET; + writel(master, ®s->dma_master); + + if (readl(®s->dma_master) & MST_RD_ENA) + DBG(ep->dev, "IN dma active after reset!\n"); + + } else { + if (unlikely((readl(®s->dma_master) & MST_WR_ENA) == 0)) + goto finished; + curr = readl(®s->out_dma_current); + + writel(curr, ®s->out_dma_end); + writel(curr, ®s->out_dma_start); + + master &= ~MST_W_BITS; + master |= MST_WR_RESET; + writel(master, ®s->dma_master); + + if (readl(®s->dma_master) & MST_WR_ENA) + DBG(ep->dev, "OUT dma active after reset!\n"); + } + req->req.actual = (curr - req->req.dma) + 1; + req->req.status = status; + + VDBG(ep->dev, "%s %s %s %d/%d\n", __func__, ep->ep.name, + ep->is_in ? "IN" : "OUT", + req->req.actual, req->req.length); + + command(regs, COMMAND_FIFO_ENABLE, ep->num); + + return; + +finished: + /* dma already completed; no abort needed */ + command(regs, COMMAND_FIFO_ENABLE, ep->num); + req->req.actual = req->req.length; + req->req.status = 0; +} + +/*-------------------------------------------------------------------------*/ + +static int +goku_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags) +{ + struct goku_request *req; + struct goku_ep *ep; + struct goku_udc *dev; + unsigned long flags; + int status; + + /* always require a cpu-view buffer so pio works */ + req = container_of(_req, struct goku_request, req); + if (unlikely(!_req || !_req->complete + || !_req->buf || !list_empty(&req->queue))) + return -EINVAL; + ep = container_of(_ep, struct goku_ep, ep); + if (unlikely(!_ep || (!ep->ep.desc && ep->num != 0))) + return -EINVAL; + dev = ep->dev; + if (unlikely(!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)) + return -ESHUTDOWN; + + /* can't touch registers when suspended */ + if (dev->ep0state == EP0_SUSPEND) + return -EBUSY; + + /* set up dma mapping in case the caller didn't */ + if (ep->dma) { + status = usb_gadget_map_request(&dev->gadget, &req->req, + ep->is_in); + if (status) + return status; + } + +#ifdef USB_TRACE + VDBG(dev, "%s queue req %p, len %u buf %p\n", + _ep->name, _req, _req->length, _req->buf); +#endif + + spin_lock_irqsave(&dev->lock, flags); + + _req->status = -EINPROGRESS; + _req->actual = 0; + + /* for ep0 IN without premature status, zlp is required and + * writing EOP starts the status stage (OUT). + */ + if (unlikely(ep->num == 0 && ep->is_in)) + _req->zero = 1; + + /* kickstart this i/o queue? */ + status = 0; + if (list_empty(&ep->queue) && likely(!ep->stopped)) { + /* dma: done after dma completion IRQ (or error) + * pio: done after last fifo operation + */ + if (ep->dma) + status = start_dma(ep, req); + else + status = (ep->is_in ? write_fifo : read_fifo)(ep, req); + + if (unlikely(status != 0)) { + if (status > 0) + status = 0; + req = NULL; + } + + } /* else pio or dma irq handler advances the queue. */ + + if (likely(req != NULL)) + list_add_tail(&req->queue, &ep->queue); + + if (likely(!list_empty(&ep->queue)) + && likely(ep->num != 0) + && !ep->dma + && !(dev->int_enable & INT_EPxDATASET (ep->num))) + pio_irq_enable(dev, dev->regs, ep->num); + + spin_unlock_irqrestore(&dev->lock, flags); + + /* pci writes may still be posted */ + return status; +} + +/* dequeue ALL requests */ +static void nuke(struct goku_ep *ep, int status) +{ + struct goku_request *req; + + ep->stopped = 1; + if (list_empty(&ep->queue)) + return; + if (ep->dma) + abort_dma(ep, status); + while (!list_empty(&ep->queue)) { + req = list_entry(ep->queue.next, struct goku_request, queue); + done(ep, req, status); + } +} + +/* dequeue JUST ONE request */ +static int goku_dequeue(struct usb_ep *_ep, struct usb_request *_req) +{ + struct goku_request *req = NULL, *iter; + struct goku_ep *ep; + struct goku_udc *dev; + unsigned long flags; + + ep = container_of(_ep, struct goku_ep, ep); + if (!_ep || !_req || (!ep->ep.desc && ep->num != 0)) + return -EINVAL; + dev = ep->dev; + if (!dev->driver) + return -ESHUTDOWN; + + /* we can't touch (dma) registers when suspended */ + if (dev->ep0state == EP0_SUSPEND) + return -EBUSY; + + VDBG(dev, "%s %s %s %s %p\n", __func__, _ep->name, + ep->is_in ? "IN" : "OUT", + ep->dma ? "dma" : "pio", + _req); + + spin_lock_irqsave(&dev->lock, flags); + + /* make sure it's actually queued on this endpoint */ + list_for_each_entry(iter, &ep->queue, queue) { + if (&iter->req != _req) + continue; + req = iter; + break; + } + if (!req) { + spin_unlock_irqrestore (&dev->lock, flags); + return -EINVAL; + } + + if (ep->dma && ep->queue.next == &req->queue && !ep->stopped) { + abort_dma(ep, -ECONNRESET); + done(ep, req, -ECONNRESET); + dma_advance(dev, ep); + } else if (!list_empty(&req->queue)) + done(ep, req, -ECONNRESET); + else + req = NULL; + spin_unlock_irqrestore(&dev->lock, flags); + + return req ? 0 : -EOPNOTSUPP; +} + +/*-------------------------------------------------------------------------*/ + +static void goku_clear_halt(struct goku_ep *ep) +{ + // assert (ep->num !=0) + VDBG(ep->dev, "%s clear halt\n", ep->ep.name); + command(ep->dev->regs, COMMAND_SETDATA0, ep->num); + command(ep->dev->regs, COMMAND_STALL_CLEAR, ep->num); + if (ep->stopped) { + ep->stopped = 0; + if (ep->dma) { + struct goku_request *req; + + if (list_empty(&ep->queue)) + return; + req = list_entry(ep->queue.next, struct goku_request, + queue); + (void) start_dma(ep, req); + } else + pio_advance(ep); + } +} + +static int goku_set_halt(struct usb_ep *_ep, int value) +{ + struct goku_ep *ep; + unsigned long flags; + int retval = 0; + + if (!_ep) + return -ENODEV; + ep = container_of (_ep, struct goku_ep, ep); + + if (ep->num == 0) { + if (value) { + ep->dev->ep0state = EP0_STALL; + ep->dev->ep[0].stopped = 1; + } else + return -EINVAL; + + /* don't change EPxSTATUS_EP_INVALID to READY */ + } else if (!ep->ep.desc) { + DBG(ep->dev, "%s %s inactive?\n", __func__, ep->ep.name); + return -EINVAL; + } + + spin_lock_irqsave(&ep->dev->lock, flags); + if (!list_empty(&ep->queue)) + retval = -EAGAIN; + else if (ep->is_in && value + /* data in (either) packet buffer? */ + && (readl(&ep->dev->regs->DataSet) + & DATASET_AB(ep->num))) + retval = -EAGAIN; + else if (!value) + goku_clear_halt(ep); + else { + ep->stopped = 1; + VDBG(ep->dev, "%s set halt\n", ep->ep.name); + command(ep->dev->regs, COMMAND_STALL, ep->num); + readl(ep->reg_status); + } + spin_unlock_irqrestore(&ep->dev->lock, flags); + return retval; +} + +static int goku_fifo_status(struct usb_ep *_ep) +{ + struct goku_ep *ep; + struct goku_udc_regs __iomem *regs; + u32 size; + + if (!_ep) + return -ENODEV; + ep = container_of(_ep, struct goku_ep, ep); + + /* size is only reported sanely for OUT */ + if (ep->is_in) + return -EOPNOTSUPP; + + /* ignores 16-byte dma buffer; SizeH == 0 */ + regs = ep->dev->regs; + size = readl(®s->EPxSizeLA[ep->num]) & DATASIZE; + size += readl(®s->EPxSizeLB[ep->num]) & DATASIZE; + VDBG(ep->dev, "%s %s %u\n", __func__, ep->ep.name, size); + return size; +} + +static void goku_fifo_flush(struct usb_ep *_ep) +{ + struct goku_ep *ep; + struct goku_udc_regs __iomem *regs; + u32 size; + + if (!_ep) + return; + ep = container_of(_ep, struct goku_ep, ep); + VDBG(ep->dev, "%s %s\n", __func__, ep->ep.name); + + /* don't change EPxSTATUS_EP_INVALID to READY */ + if (!ep->ep.desc && ep->num != 0) { + DBG(ep->dev, "%s %s inactive?\n", __func__, ep->ep.name); + return; + } + + regs = ep->dev->regs; + size = readl(®s->EPxSizeLA[ep->num]); + size &= DATASIZE; + + /* Non-desirable behavior: FIFO_CLEAR also clears the + * endpoint halt feature. For OUT, we _could_ just read + * the bytes out (PIO, if !ep->dma); for in, no choice. + */ + if (size) + command(regs, COMMAND_FIFO_CLEAR, ep->num); +} + +static const struct usb_ep_ops goku_ep_ops = { + .enable = goku_ep_enable, + .disable = goku_ep_disable, + + .alloc_request = goku_alloc_request, + .free_request = goku_free_request, + + .queue = goku_queue, + .dequeue = goku_dequeue, + + .set_halt = goku_set_halt, + .fifo_status = goku_fifo_status, + .fifo_flush = goku_fifo_flush, +}; + +/*-------------------------------------------------------------------------*/ + +static int goku_get_frame(struct usb_gadget *_gadget) +{ + return -EOPNOTSUPP; +} + +static struct usb_ep *goku_match_ep(struct usb_gadget *g, + struct usb_endpoint_descriptor *desc, + struct usb_ss_ep_comp_descriptor *ep_comp) +{ + struct goku_udc *dev = to_goku_udc(g); + struct usb_ep *ep; + + switch (usb_endpoint_type(desc)) { + case USB_ENDPOINT_XFER_INT: + /* single buffering is enough */ + ep = &dev->ep[3].ep; + if (usb_gadget_ep_match_desc(g, ep, desc, ep_comp)) + return ep; + break; + case USB_ENDPOINT_XFER_BULK: + if (usb_endpoint_dir_in(desc)) { + /* DMA may be available */ + ep = &dev->ep[2].ep; + if (usb_gadget_ep_match_desc(g, ep, desc, ep_comp)) + return ep; + } + break; + default: + /* nothing */ ; + } + + return NULL; +} + +static int goku_udc_start(struct usb_gadget *g, + struct usb_gadget_driver *driver); +static int goku_udc_stop(struct usb_gadget *g); + +static const struct usb_gadget_ops goku_ops = { + .get_frame = goku_get_frame, + .udc_start = goku_udc_start, + .udc_stop = goku_udc_stop, + .match_ep = goku_match_ep, + // no remote wakeup + // not selfpowered +}; + +/*-------------------------------------------------------------------------*/ + +static inline const char *dmastr(void) +{ + if (use_dma == 0) + return "(dma disabled)"; + else if (use_dma == 2) + return "(dma IN and OUT)"; + else + return "(dma IN)"; +} + +#ifdef CONFIG_USB_GADGET_DEBUG_FILES + +static const char proc_node_name [] = "driver/udc"; + +#define FOURBITS "%s%s%s%s" +#define EIGHTBITS FOURBITS FOURBITS + +static void dump_intmask(struct seq_file *m, const char *label, u32 mask) +{ + /* int_status is the same format ... */ + seq_printf(m, "%s %05X =" FOURBITS EIGHTBITS EIGHTBITS "\n", + label, mask, + (mask & INT_PWRDETECT) ? " power" : "", + (mask & INT_SYSERROR) ? " sys" : "", + (mask & INT_MSTRDEND) ? " in-dma" : "", + (mask & INT_MSTWRTMOUT) ? " wrtmo" : "", + + (mask & INT_MSTWREND) ? " out-dma" : "", + (mask & INT_MSTWRSET) ? " wrset" : "", + (mask & INT_ERR) ? " err" : "", + (mask & INT_SOF) ? " sof" : "", + + (mask & INT_EP3NAK) ? " ep3nak" : "", + (mask & INT_EP2NAK) ? " ep2nak" : "", + (mask & INT_EP1NAK) ? " ep1nak" : "", + (mask & INT_EP3DATASET) ? " ep3" : "", + + (mask & INT_EP2DATASET) ? " ep2" : "", + (mask & INT_EP1DATASET) ? " ep1" : "", + (mask & INT_STATUSNAK) ? " ep0snak" : "", + (mask & INT_STATUS) ? " ep0status" : "", + + (mask & INT_SETUP) ? " setup" : "", + (mask & INT_ENDPOINT0) ? " ep0" : "", + (mask & INT_USBRESET) ? " reset" : "", + (mask & INT_SUSPEND) ? " suspend" : ""); +} + +static const char *udc_ep_state(enum ep0state state) +{ + switch (state) { + case EP0_DISCONNECT: + return "ep0_disconnect"; + case EP0_IDLE: + return "ep0_idle"; + case EP0_IN: + return "ep0_in"; + case EP0_OUT: + return "ep0_out"; + case EP0_STATUS: + return "ep0_status"; + case EP0_STALL: + return "ep0_stall"; + case EP0_SUSPEND: + return "ep0_suspend"; + } + + return "ep0_?"; +} + +static const char *udc_ep_status(u32 status) +{ + switch (status & EPxSTATUS_EP_MASK) { + case EPxSTATUS_EP_READY: + return "ready"; + case EPxSTATUS_EP_DATAIN: + return "packet"; + case EPxSTATUS_EP_FULL: + return "full"; + case EPxSTATUS_EP_TX_ERR: /* host will retry */ + return "tx_err"; + case EPxSTATUS_EP_RX_ERR: + return "rx_err"; + case EPxSTATUS_EP_BUSY: /* ep0 only */ + return "busy"; + case EPxSTATUS_EP_STALL: + return "stall"; + case EPxSTATUS_EP_INVALID: /* these "can't happen" */ + return "invalid"; + } + + return "?"; +} + +static int udc_proc_read(struct seq_file *m, void *v) +{ + struct goku_udc *dev = m->private; + struct goku_udc_regs __iomem *regs = dev->regs; + unsigned long flags; + int i, is_usb_connected; + u32 tmp; + + local_irq_save(flags); + + /* basic device status */ + tmp = readl(®s->power_detect); + is_usb_connected = tmp & PW_DETECT; + seq_printf(m, + "%s - %s\n" + "%s version: %s %s\n" + "Gadget driver: %s\n" + "Host %s, %s\n" + "\n", + pci_name(dev->pdev), driver_desc, + driver_name, DRIVER_VERSION, dmastr(), + dev->driver ? dev->driver->driver.name : "(none)", + is_usb_connected + ? ((tmp & PW_PULLUP) ? "full speed" : "powered") + : "disconnected", + udc_ep_state(dev->ep0state)); + + dump_intmask(m, "int_status", readl(®s->int_status)); + dump_intmask(m, "int_enable", readl(®s->int_enable)); + + if (!is_usb_connected || !dev->driver || (tmp & PW_PULLUP) == 0) + goto done; + + /* registers for (active) device and ep0 */ + seq_printf(m, "\nirqs %lu\ndataset %02x single.bcs %02x.%02x state %x addr %u\n", + dev->irqs, readl(®s->DataSet), + readl(®s->EPxSingle), readl(®s->EPxBCS), + readl(®s->UsbState), + readl(®s->address)); + if (seq_has_overflowed(m)) + goto done; + + tmp = readl(®s->dma_master); + seq_printf(m, "dma %03X =" EIGHTBITS "%s %s\n", + tmp, + (tmp & MST_EOPB_DIS) ? " eopb-" : "", + (tmp & MST_EOPB_ENA) ? " eopb+" : "", + (tmp & MST_TIMEOUT_DIS) ? " tmo-" : "", + (tmp & MST_TIMEOUT_ENA) ? " tmo+" : "", + + (tmp & MST_RD_EOPB) ? " eopb" : "", + (tmp & MST_RD_RESET) ? " in_reset" : "", + (tmp & MST_WR_RESET) ? " out_reset" : "", + (tmp & MST_RD_ENA) ? " IN" : "", + + (tmp & MST_WR_ENA) ? " OUT" : "", + (tmp & MST_CONNECTION) ? "ep1in/ep2out" : "ep1out/ep2in"); + if (seq_has_overflowed(m)) + goto done; + + /* dump endpoint queues */ + for (i = 0; i < 4; i++) { + struct goku_ep *ep = &dev->ep [i]; + struct goku_request *req; + + if (i && !ep->ep.desc) + continue; + + tmp = readl(ep->reg_status); + seq_printf(m, "%s %s max %u %s, irqs %lu, status %02x (%s) " FOURBITS "\n", + ep->ep.name, + ep->is_in ? "in" : "out", + ep->ep.maxpacket, + ep->dma ? "dma" : "pio", + ep->irqs, + tmp, udc_ep_status(tmp), + (tmp & EPxSTATUS_TOGGLE) ? "data1" : "data0", + (tmp & EPxSTATUS_SUSPEND) ? " suspend" : "", + (tmp & EPxSTATUS_FIFO_DISABLE) ? " disable" : "", + (tmp & EPxSTATUS_STAGE_ERROR) ? " ep0stat" : ""); + if (seq_has_overflowed(m)) + goto done; + + if (list_empty(&ep->queue)) { + seq_puts(m, "\t(nothing queued)\n"); + if (seq_has_overflowed(m)) + goto done; + continue; + } + list_for_each_entry(req, &ep->queue, queue) { + if (ep->dma && req->queue.prev == &ep->queue) { + if (i == UDC_MSTRD_ENDPOINT) + tmp = readl(®s->in_dma_current); + else + tmp = readl(®s->out_dma_current); + tmp -= req->req.dma; + tmp++; + } else + tmp = req->req.actual; + + seq_printf(m, "\treq %p len %u/%u buf %p\n", + &req->req, tmp, req->req.length, + req->req.buf); + if (seq_has_overflowed(m)) + goto done; + } + } + +done: + local_irq_restore(flags); + return 0; +} +#endif /* CONFIG_USB_GADGET_DEBUG_FILES */ + +/*-------------------------------------------------------------------------*/ + +static void udc_reinit (struct goku_udc *dev) +{ + static char *names [] = { "ep0", "ep1-bulk", "ep2-bulk", "ep3-bulk" }; + + unsigned i; + + INIT_LIST_HEAD (&dev->gadget.ep_list); + dev->gadget.ep0 = &dev->ep [0].ep; + dev->gadget.speed = USB_SPEED_UNKNOWN; + dev->ep0state = EP0_DISCONNECT; + dev->irqs = 0; + + for (i = 0; i < 4; i++) { + struct goku_ep *ep = &dev->ep[i]; + + ep->num = i; + ep->ep.name = names[i]; + ep->reg_fifo = &dev->regs->ep_fifo [i]; + ep->reg_status = &dev->regs->ep_status [i]; + ep->reg_mode = &dev->regs->ep_mode[i]; + + ep->ep.ops = &goku_ep_ops; + list_add_tail (&ep->ep.ep_list, &dev->gadget.ep_list); + ep->dev = dev; + INIT_LIST_HEAD (&ep->queue); + + ep_reset(NULL, ep); + + if (i == 0) + ep->ep.caps.type_control = true; + else + ep->ep.caps.type_bulk = true; + + ep->ep.caps.dir_in = true; + ep->ep.caps.dir_out = true; + } + + dev->ep[0].reg_mode = NULL; + usb_ep_set_maxpacket_limit(&dev->ep[0].ep, MAX_EP0_SIZE); + list_del_init (&dev->ep[0].ep.ep_list); +} + +static void udc_reset(struct goku_udc *dev) +{ + struct goku_udc_regs __iomem *regs = dev->regs; + + writel(0, ®s->power_detect); + writel(0, ®s->int_enable); + readl(®s->int_enable); + dev->int_enable = 0; + + /* deassert reset, leave USB D+ at hi-Z (no pullup) + * don't let INT_PWRDETECT sequence begin + */ + udelay(250); + writel(PW_RESETB, ®s->power_detect); + readl(®s->int_enable); +} + +static void ep0_start(struct goku_udc *dev) +{ + struct goku_udc_regs __iomem *regs = dev->regs; + unsigned i; + + VDBG(dev, "%s\n", __func__); + + udc_reset(dev); + udc_reinit (dev); + //writel(MST_EOPB_ENA | MST_TIMEOUT_ENA, ®s->dma_master); + + /* hw handles set_address, set_feature, get_status; maybe more */ + writel( G_REQMODE_SET_INTF | G_REQMODE_GET_INTF + | G_REQMODE_SET_CONF | G_REQMODE_GET_CONF + | G_REQMODE_GET_DESC + | G_REQMODE_CLEAR_FEAT + , ®s->reqmode); + + for (i = 0; i < 4; i++) + dev->ep[i].irqs = 0; + + /* can't modify descriptors after writing UsbReady */ + for (i = 0; i < DESC_LEN; i++) + writel(0, ®s->descriptors[i]); + writel(0, ®s->UsbReady); + + /* expect ep0 requests when the host drops reset */ + writel(PW_RESETB | PW_PULLUP, ®s->power_detect); + dev->int_enable = INT_DEVWIDE | INT_EP0; + writel(dev->int_enable, &dev->regs->int_enable); + readl(®s->int_enable); + dev->gadget.speed = USB_SPEED_FULL; + dev->ep0state = EP0_IDLE; +} + +static void udc_enable(struct goku_udc *dev) +{ + /* start enumeration now, or after power detect irq */ + if (readl(&dev->regs->power_detect) & PW_DETECT) + ep0_start(dev); + else { + DBG(dev, "%s\n", __func__); + dev->int_enable = INT_PWRDETECT; + writel(dev->int_enable, &dev->regs->int_enable); + } +} + +/*-------------------------------------------------------------------------*/ + +/* keeping it simple: + * - one bus driver, initted first; + * - one function driver, initted second + */ + +/* when a driver is successfully registered, it will receive + * control requests including set_configuration(), which enables + * non-control requests. then usb traffic follows until a + * disconnect is reported. then a host may connect again, or + * the driver might get unbound. + */ +static int goku_udc_start(struct usb_gadget *g, + struct usb_gadget_driver *driver) +{ + struct goku_udc *dev = to_goku_udc(g); + + /* hook up the driver */ + dev->driver = driver; + + /* + * then enable host detection and ep0; and we're ready + * for set_configuration as well as eventual disconnect. + */ + udc_enable(dev); + + return 0; +} + +static void stop_activity(struct goku_udc *dev) +{ + unsigned i; + + DBG (dev, "%s\n", __func__); + + /* disconnect gadget driver after quiesceing hw and the driver */ + udc_reset (dev); + for (i = 0; i < 4; i++) + nuke(&dev->ep [i], -ESHUTDOWN); + + if (dev->driver) + udc_enable(dev); +} + +static int goku_udc_stop(struct usb_gadget *g) +{ + struct goku_udc *dev = to_goku_udc(g); + unsigned long flags; + + spin_lock_irqsave(&dev->lock, flags); + dev->driver = NULL; + stop_activity(dev); + spin_unlock_irqrestore(&dev->lock, flags); + + return 0; +} + +/*-------------------------------------------------------------------------*/ + +static void ep0_setup(struct goku_udc *dev) +{ + struct goku_udc_regs __iomem *regs = dev->regs; + struct usb_ctrlrequest ctrl; + int tmp; + + /* read SETUP packet and enter DATA stage */ + ctrl.bRequestType = readl(®s->bRequestType); + ctrl.bRequest = readl(®s->bRequest); + ctrl.wValue = cpu_to_le16((readl(®s->wValueH) << 8) + | readl(®s->wValueL)); + ctrl.wIndex = cpu_to_le16((readl(®s->wIndexH) << 8) + | readl(®s->wIndexL)); + ctrl.wLength = cpu_to_le16((readl(®s->wLengthH) << 8) + | readl(®s->wLengthL)); + writel(0, ®s->SetupRecv); + + nuke(&dev->ep[0], 0); + dev->ep[0].stopped = 0; + if (likely(ctrl.bRequestType & USB_DIR_IN)) { + dev->ep[0].is_in = 1; + dev->ep0state = EP0_IN; + /* detect early status stages */ + writel(ICONTROL_STATUSNAK, &dev->regs->IntControl); + } else { + dev->ep[0].is_in = 0; + dev->ep0state = EP0_OUT; + + /* NOTE: CLEAR_FEATURE is done in software so that we can + * synchronize transfer restarts after bulk IN stalls. data + * won't even enter the fifo until the halt is cleared. + */ + switch (ctrl.bRequest) { + case USB_REQ_CLEAR_FEATURE: + switch (ctrl.bRequestType) { + case USB_RECIP_ENDPOINT: + tmp = le16_to_cpu(ctrl.wIndex) & 0x0f; + /* active endpoint */ + if (tmp > 3 || + (!dev->ep[tmp].ep.desc && tmp != 0)) + goto stall; + if (ctrl.wIndex & cpu_to_le16( + USB_DIR_IN)) { + if (!dev->ep[tmp].is_in) + goto stall; + } else { + if (dev->ep[tmp].is_in) + goto stall; + } + if (ctrl.wValue != cpu_to_le16( + USB_ENDPOINT_HALT)) + goto stall; + if (tmp) + goku_clear_halt(&dev->ep[tmp]); +succeed: + /* start ep0out status stage */ + writel(~(1<<0), ®s->EOP); + dev->ep[0].stopped = 1; + dev->ep0state = EP0_STATUS; + return; + case USB_RECIP_DEVICE: + /* device remote wakeup: always clear */ + if (ctrl.wValue != cpu_to_le16(1)) + goto stall; + VDBG(dev, "clear dev remote wakeup\n"); + goto succeed; + case USB_RECIP_INTERFACE: + goto stall; + default: /* pass to gadget driver */ + break; + } + break; + default: + break; + } + } + +#ifdef USB_TRACE + VDBG(dev, "SETUP %02x.%02x v%04x i%04x l%04x\n", + ctrl.bRequestType, ctrl.bRequest, + le16_to_cpu(ctrl.wValue), le16_to_cpu(ctrl.wIndex), + le16_to_cpu(ctrl.wLength)); +#endif + + /* hw wants to know when we're configured (or not) */ + dev->req_config = (ctrl.bRequest == USB_REQ_SET_CONFIGURATION + && ctrl.bRequestType == USB_RECIP_DEVICE); + if (unlikely(dev->req_config)) + dev->configured = (ctrl.wValue != cpu_to_le16(0)); + + /* delegate everything to the gadget driver. + * it may respond after this irq handler returns. + */ + spin_unlock (&dev->lock); + tmp = dev->driver->setup(&dev->gadget, &ctrl); + spin_lock (&dev->lock); + if (unlikely(tmp < 0)) { +stall: +#ifdef USB_TRACE + VDBG(dev, "req %02x.%02x protocol STALL; err %d\n", + ctrl.bRequestType, ctrl.bRequest, tmp); +#endif + command(regs, COMMAND_STALL, 0); + dev->ep[0].stopped = 1; + dev->ep0state = EP0_STALL; + } + + /* expect at least one data or status stage irq */ +} + +#define ACK(irqbit) { \ + stat &= ~irqbit; \ + writel(~irqbit, ®s->int_status); \ + handled = 1; \ + } + +static irqreturn_t goku_irq(int irq, void *_dev) +{ + struct goku_udc *dev = _dev; + struct goku_udc_regs __iomem *regs = dev->regs; + struct goku_ep *ep; + u32 stat, handled = 0; + unsigned i, rescans = 5; + + spin_lock(&dev->lock); + +rescan: + stat = readl(®s->int_status) & dev->int_enable; + if (!stat) + goto done; + dev->irqs++; + + /* device-wide irqs */ + if (unlikely(stat & INT_DEVWIDE)) { + if (stat & INT_SYSERROR) { + ERROR(dev, "system error\n"); + stop_activity(dev); + stat = 0; + handled = 1; + // FIXME have a neater way to prevent re-enumeration + dev->driver = NULL; + goto done; + } + if (stat & INT_PWRDETECT) { + writel(~stat, ®s->int_status); + if (readl(&dev->regs->power_detect) & PW_DETECT) { + VDBG(dev, "connect\n"); + ep0_start(dev); + } else { + DBG(dev, "disconnect\n"); + if (dev->gadget.speed == USB_SPEED_FULL) + stop_activity(dev); + dev->ep0state = EP0_DISCONNECT; + dev->int_enable = INT_DEVWIDE; + writel(dev->int_enable, &dev->regs->int_enable); + } + stat = 0; + handled = 1; + goto done; + } + if (stat & INT_SUSPEND) { + ACK(INT_SUSPEND); + if (readl(®s->ep_status[0]) & EPxSTATUS_SUSPEND) { + switch (dev->ep0state) { + case EP0_DISCONNECT: + case EP0_SUSPEND: + goto pm_next; + default: + break; + } + DBG(dev, "USB suspend\n"); + dev->ep0state = EP0_SUSPEND; + if (dev->gadget.speed != USB_SPEED_UNKNOWN + && dev->driver + && dev->driver->suspend) { + spin_unlock(&dev->lock); + dev->driver->suspend(&dev->gadget); + spin_lock(&dev->lock); + } + } else { + if (dev->ep0state != EP0_SUSPEND) { + DBG(dev, "bogus USB resume %d\n", + dev->ep0state); + goto pm_next; + } + DBG(dev, "USB resume\n"); + dev->ep0state = EP0_IDLE; + if (dev->gadget.speed != USB_SPEED_UNKNOWN + && dev->driver + && dev->driver->resume) { + spin_unlock(&dev->lock); + dev->driver->resume(&dev->gadget); + spin_lock(&dev->lock); + } + } + } +pm_next: + if (stat & INT_USBRESET) { /* hub reset done */ + ACK(INT_USBRESET); + INFO(dev, "USB reset done, gadget %s\n", + dev->driver->driver.name); + } + // and INT_ERR on some endpoint's crc/bitstuff/... problem + } + + /* progress ep0 setup, data, or status stages. + * no transition {EP0_STATUS, EP0_STALL} --> EP0_IDLE; saves irqs + */ + if (stat & INT_SETUP) { + ACK(INT_SETUP); + dev->ep[0].irqs++; + ep0_setup(dev); + } + if (stat & INT_STATUSNAK) { + ACK(INT_STATUSNAK|INT_ENDPOINT0); + if (dev->ep0state == EP0_IN) { + ep = &dev->ep[0]; + ep->irqs++; + nuke(ep, 0); + writel(~(1<<0), ®s->EOP); + dev->ep0state = EP0_STATUS; + } + } + if (stat & INT_ENDPOINT0) { + ACK(INT_ENDPOINT0); + ep = &dev->ep[0]; + ep->irqs++; + pio_advance(ep); + } + + /* dma completion */ + if (stat & INT_MSTRDEND) { /* IN */ + ACK(INT_MSTRDEND); + ep = &dev->ep[UDC_MSTRD_ENDPOINT]; + ep->irqs++; + dma_advance(dev, ep); + } + if (stat & INT_MSTWREND) { /* OUT */ + ACK(INT_MSTWREND); + ep = &dev->ep[UDC_MSTWR_ENDPOINT]; + ep->irqs++; + dma_advance(dev, ep); + } + if (stat & INT_MSTWRTMOUT) { /* OUT */ + ACK(INT_MSTWRTMOUT); + ep = &dev->ep[UDC_MSTWR_ENDPOINT]; + ep->irqs++; + ERROR(dev, "%s write timeout ?\n", ep->ep.name); + // reset dma? then dma_advance() + } + + /* pio */ + for (i = 1; i < 4; i++) { + u32 tmp = INT_EPxDATASET(i); + + if (!(stat & tmp)) + continue; + ep = &dev->ep[i]; + pio_advance(ep); + if (list_empty (&ep->queue)) + pio_irq_disable(dev, regs, i); + stat &= ~tmp; + handled = 1; + ep->irqs++; + } + + if (rescans--) + goto rescan; + +done: + (void)readl(®s->int_enable); + spin_unlock(&dev->lock); + if (stat) + DBG(dev, "unhandled irq status: %05x (%05x, %05x)\n", stat, + readl(®s->int_status), dev->int_enable); + return IRQ_RETVAL(handled); +} + +#undef ACK + +/*-------------------------------------------------------------------------*/ + +static void gadget_release(struct device *_dev) +{ + struct goku_udc *dev = dev_get_drvdata(_dev); + + kfree(dev); +} + +/* tear down the binding between this driver and the pci device */ + +static void goku_remove(struct pci_dev *pdev) +{ + struct goku_udc *dev = pci_get_drvdata(pdev); + + DBG(dev, "%s\n", __func__); + + usb_del_gadget_udc(&dev->gadget); + + BUG_ON(dev->driver); + +#ifdef CONFIG_USB_GADGET_DEBUG_FILES + remove_proc_entry(proc_node_name, NULL); +#endif + if (dev->regs) + udc_reset(dev); + if (dev->got_irq) + free_irq(pdev->irq, dev); + if (dev->regs) + iounmap(dev->regs); + if (dev->got_region) + release_mem_region(pci_resource_start (pdev, 0), + pci_resource_len (pdev, 0)); + if (dev->enabled) + pci_disable_device(pdev); + + dev->regs = NULL; + + INFO(dev, "unbind\n"); +} + +/* wrap this driver around the specified pci device, but + * don't respond over USB until a gadget driver binds to us. + */ + +static int goku_probe(struct pci_dev *pdev, const struct pci_device_id *id) +{ + struct goku_udc *dev = NULL; + unsigned long resource, len; + void __iomem *base = NULL; + int retval; + + if (!pdev->irq) { + printk(KERN_ERR "Check PCI %s IRQ setup!\n", pci_name(pdev)); + retval = -ENODEV; + goto err; + } + + /* alloc, and start init */ + dev = kzalloc (sizeof *dev, GFP_KERNEL); + if (!dev) { + retval = -ENOMEM; + goto err; + } + + pci_set_drvdata(pdev, dev); + spin_lock_init(&dev->lock); + dev->pdev = pdev; + dev->gadget.ops = &goku_ops; + dev->gadget.max_speed = USB_SPEED_FULL; + + /* the "gadget" abstracts/virtualizes the controller */ + dev->gadget.name = driver_name; + + /* now all the pci goodies ... */ + retval = pci_enable_device(pdev); + if (retval < 0) { + DBG(dev, "can't enable, %d\n", retval); + goto err; + } + dev->enabled = 1; + + resource = pci_resource_start(pdev, 0); + len = pci_resource_len(pdev, 0); + if (!request_mem_region(resource, len, driver_name)) { + DBG(dev, "controller already in use\n"); + retval = -EBUSY; + goto err; + } + dev->got_region = 1; + + base = ioremap(resource, len); + if (base == NULL) { + DBG(dev, "can't map memory\n"); + retval = -EFAULT; + goto err; + } + dev->regs = (struct goku_udc_regs __iomem *) base; + + INFO(dev, "%s\n", driver_desc); + INFO(dev, "version: " DRIVER_VERSION " %s\n", dmastr()); + INFO(dev, "irq %d, pci mem %p\n", pdev->irq, base); + + /* init to known state, then setup irqs */ + udc_reset(dev); + udc_reinit (dev); + if (request_irq(pdev->irq, goku_irq, IRQF_SHARED, + driver_name, dev) != 0) { + DBG(dev, "request interrupt %d failed\n", pdev->irq); + retval = -EBUSY; + goto err; + } + dev->got_irq = 1; + if (use_dma) + pci_set_master(pdev); + + +#ifdef CONFIG_USB_GADGET_DEBUG_FILES + proc_create_single_data(proc_node_name, 0, NULL, udc_proc_read, dev); +#endif + + retval = usb_add_gadget_udc_release(&pdev->dev, &dev->gadget, + gadget_release); + if (retval) + goto err; + + return 0; + +err: + if (dev) + goku_remove (pdev); + /* gadget_release is not registered yet, kfree explicitly */ + kfree(dev); + return retval; +} + + +/*-------------------------------------------------------------------------*/ + +static const struct pci_device_id pci_ids[] = { { + .class = PCI_CLASS_SERIAL_USB_DEVICE, + .class_mask = ~0, + .vendor = 0x102f, /* Toshiba */ + .device = 0x0107, /* this UDC */ + .subvendor = PCI_ANY_ID, + .subdevice = PCI_ANY_ID, + +}, { /* end: all zeroes */ } +}; +MODULE_DEVICE_TABLE (pci, pci_ids); + +static struct pci_driver goku_pci_driver = { + .name = driver_name, + .id_table = pci_ids, + + .probe = goku_probe, + .remove = goku_remove, + + /* FIXME add power management support */ +}; + +module_pci_driver(goku_pci_driver); -- cgit v1.2.3