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path: root/drivers/usb/gadget/goku_udc.c
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Diffstat (limited to 'drivers/usb/gadget/goku_udc.c')
-rw-r--r--drivers/usb/gadget/goku_udc.c1984
1 files changed, 1984 insertions, 0 deletions
diff --git a/drivers/usb/gadget/goku_udc.c b/drivers/usb/gadget/goku_udc.c
new file mode 100644
index 000000000000..005db7cca292
--- /dev/null
+++ b/drivers/usb/gadget/goku_udc.c
@@ -0,0 +1,1984 @@
+/*
+ * 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 file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+/*
+ * 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).
+ */
+
+#undef DEBUG
+// #define VERBOSE /* extra debug messages (success too) */
+// #define USB_TRACE /* packet-level success messages */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include <linux/ioport.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/smp_lock.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/timer.h>
+#include <linux/list.h>
+#include <linux/interrupt.h>
+#include <linux/proc_fs.h>
+#include <linux/device.h>
+#include <linux/usb_ch9.h>
+#include <linux/usb_gadget.h>
+
+#include <asm/byteorder.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/system.h>
+#include <asm/unaligned.h>
+
+
+#include "goku_udc.h"
+
+#define DRIVER_DESC "TC86C001 USB Device Controller"
+#define DRIVER_VERSION "30-Oct 2003"
+
+#define DMA_ADDR_INVALID (~(dma_addr_t)0)
+
+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 enabled by default, even
+ * if the OUT-dma abort problems had a resolution.
+ */
+static unsigned use_dma = 1;
+
+#if 0
+//#include <linux/moduleparam.h>
+/* "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, &regs->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 || 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 != (desc->bEndpointAddress & 0x0f))
+ return -EINVAL;
+
+ switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
+ 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 = le16_to_cpu(get_unaligned(&desc->wMaxPacketSize));
+ switch (max) {
+ case 64: mode++;
+ case 32: mode++;
+ case 16: mode++;
+ 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_DIR_IN & desc->bEndpointAddress) != 0;
+ 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(&regs->EPxSingle);
+ writel(tmp, &regs->EPxSingle);
+
+ tmp = (ep->dma ? 0x10/*dma*/ : 0x11/*pio*/) << ep->num;
+ tmp |= readl(&regs->EPxBCS);
+ writel(tmp, &regs->EPxBCS);
+ }
+ writel(mode, ep->reg_mode);
+ command(ep->dev->regs, COMMAND_RESET, ep->num);
+ ep->ep.maxpacket = max;
+ ep->stopped = 0;
+ 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, &regs->int_enable);
+ readl(&regs->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(&regs->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, &regs->dma_master);
+ }
+ }
+
+ ep->ep.maxpacket = MAX_FIFO_SIZE;
+ 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->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, int gfp_flags)
+{
+ struct goku_request *req;
+
+ if (!_ep)
+ return NULL;
+ req = kmalloc(sizeof *req, gfp_flags);
+ if (!req)
+ return NULL;
+
+ memset(req, 0, sizeof *req);
+ req->req.dma = DMA_ADDR_INVALID;
+ 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);
+}
+
+/*-------------------------------------------------------------------------*/
+
+#undef USE_KMALLOC
+
+/* many common platforms have dma-coherent caches, which means that it's
+ * safe to use kmalloc() memory for all i/o buffers without using any
+ * cache flushing calls. (unless you're trying to share cache lines
+ * between dma and non-dma activities, which is a slow idea in any case.)
+ *
+ * other platforms need more care, with 2.6 having a moderately general
+ * solution except for the common "buffer is smaller than a page" case.
+ */
+#if defined(CONFIG_X86)
+#define USE_KMALLOC
+
+#elif defined(CONFIG_MIPS) && !defined(CONFIG_NONCOHERENT_IO)
+#define USE_KMALLOC
+
+#elif defined(CONFIG_PPC) && !defined(CONFIG_NOT_COHERENT_CACHE)
+#define USE_KMALLOC
+
+#endif
+
+/* allocating buffers this way eliminates dma mapping overhead, which
+ * on some platforms will mean eliminating a per-io buffer copy. with
+ * some kinds of system caches, further tweaks may still be needed.
+ */
+static void *
+goku_alloc_buffer(struct usb_ep *_ep, unsigned bytes,
+ dma_addr_t *dma, int gfp_flags)
+{
+ void *retval;
+ struct goku_ep *ep;
+
+ ep = container_of(_ep, struct goku_ep, ep);
+ if (!_ep)
+ return NULL;
+ *dma = DMA_ADDR_INVALID;
+
+#if defined(USE_KMALLOC)
+ retval = kmalloc(bytes, gfp_flags);
+ if (retval)
+ *dma = virt_to_phys(retval);
+#else
+ if (ep->dma) {
+ /* the main problem with this call is that it wastes memory
+ * on typical 1/N page allocations: it allocates 1-N pages.
+ */
+#warning Using dma_alloc_coherent even with buffers smaller than a page.
+ retval = dma_alloc_coherent(&ep->dev->pdev->dev,
+ bytes, dma, gfp_flags);
+ } else
+ retval = kmalloc(bytes, gfp_flags);
+#endif
+ return retval;
+}
+
+static void
+goku_free_buffer(struct usb_ep *_ep, void *buf, dma_addr_t dma, unsigned bytes)
+{
+ /* free memory into the right allocator */
+#ifndef USE_KMALLOC
+ if (dma != DMA_ADDR_INVALID) {
+ struct goku_ep *ep;
+
+ ep = container_of(_ep, struct goku_ep, ep);
+ if (!_ep)
+ return;
+ dma_free_coherent(&ep->dev->pdev->dev, bytes, buf, dma);
+ } else
+#endif
+ kfree (buf);
+}
+
+/*-------------------------------------------------------------------------*/
+
+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 (req->mapped) {
+ pci_unmap_single(dev->pdev, req->req.dma, req->req.length,
+ ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
+ req->req.dma = DMA_ADDR_INVALID;
+ req->mapped = 0;
+ }
+
+#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);
+ req->req.complete(&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<<ep->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), &regs->int_status);
+
+ set = readl(&regs->DataSet) & DATASET_AB(ep->num);
+ size = readl(&regs->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(&regs->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,
+ &regs->UsbState);
+ /* ep0out status stage */
+ writel(~(1<<0), &regs->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, &regs->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, &regs->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(&regs->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, &regs->in_dma_end);
+ writel(start, &regs->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, &regs->out_dma_end);
+ writel(start, &regs->out_dma_start);
+
+ master &= ~MST_W_BITS;
+ master |= MST_WR_ENA | MST_TIMEOUT_DIS;
+
+ ep->dev->int_enable |= INT_MSTWREND|INT_MSTWRTMOUT;
+ }
+
+ writel(master, &regs->dma_master);
+ writel(ep->dev->int_enable, &regs->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(&regs->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, &regs->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(&regs->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(&regs->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(&regs->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(&regs->dma_master) & MST_RD_ENA) == 0))
+ goto finished;
+ curr = readl(&regs->in_dma_current);
+
+ writel(curr, &regs->in_dma_end);
+ writel(curr, &regs->in_dma_start);
+
+ master &= ~MST_R_BITS;
+ master |= MST_RD_RESET;
+ writel(master, &regs->dma_master);
+
+ if (readl(&regs->dma_master) & MST_RD_ENA)
+ DBG(ep->dev, "IN dma active after reset!\n");
+
+ } else {
+ if (unlikely((readl(&regs->dma_master) & MST_WR_ENA) == 0))
+ goto finished;
+ curr = readl(&regs->out_dma_current);
+
+ writel(curr, &regs->out_dma_end);
+ writel(curr, &regs->out_dma_start);
+
+ master &= ~MST_W_BITS;
+ master |= MST_WR_RESET;
+ writel(master, &regs->dma_master);
+
+ if (readl(&regs->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", __FUNCTION__, 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, int 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->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 && _req->dma == DMA_ADDR_INVALID) {
+ _req->dma = pci_map_single(dev->pdev, _req->buf, _req->length,
+ ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
+ req->mapped = 1;
+ }
+
+#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 != 0))
+ 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;
+ struct goku_ep *ep;
+ struct goku_udc *dev;
+ unsigned long flags;
+
+ ep = container_of(_ep, struct goku_ep, ep);
+ if (!_ep || !_req || (!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", __FUNCTION__, _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 (req, &ep->queue, queue) {
+ if (&req->req == _req)
+ break;
+ }
+ if (&req->req != _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->desc) {
+ DBG(ep->dev, "%s %s inactive?\n", __FUNCTION__, 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(&regs->EPxSizeLA[ep->num]) & DATASIZE;
+ size += readl(&regs->EPxSizeLB[ep->num]) & DATASIZE;
+ VDBG(ep->dev, "%s %s %u\n", __FUNCTION__, 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", __FUNCTION__, ep->ep.name);
+
+ /* don't change EPxSTATUS_EP_INVALID to READY */
+ if (!ep->desc && ep->num != 0) {
+ DBG(ep->dev, "%s %s inactive?\n", __FUNCTION__, ep->ep.name);
+ return;
+ }
+
+ regs = ep->dev->regs;
+ size = readl(&regs->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 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,
+
+ .alloc_buffer = goku_alloc_buffer,
+ .free_buffer = goku_free_buffer,
+
+ .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 const struct usb_gadget_ops goku_ops = {
+ .get_frame = goku_get_frame,
+ // no remote wakeup
+ // not selfpowered
+};
+
+/*-------------------------------------------------------------------------*/
+
+static inline 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(const char *label, u32 mask, char **next, unsigned *size)
+{
+ int t;
+
+ /* int_status is the same format ... */
+ t = scnprintf(*next, *size,
+ "%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" : "");
+ *size -= t;
+ *next += t;
+}
+
+
+static int
+udc_proc_read(char *buffer, char **start, off_t off, int count,
+ int *eof, void *_dev)
+{
+ char *buf = buffer;
+ struct goku_udc *dev = _dev;
+ struct goku_udc_regs __iomem *regs = dev->regs;
+ char *next = buf;
+ unsigned size = count;
+ unsigned long flags;
+ int i, t, is_usb_connected;
+ u32 tmp;
+
+ if (off != 0)
+ return 0;
+
+ local_irq_save(flags);
+
+ /* basic device status */
+ tmp = readl(&regs->power_detect);
+ is_usb_connected = tmp & PW_DETECT;
+ t = scnprintf(next, size,
+ "%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",
+ ({char *tmp;
+ switch(dev->ep0state){
+ case EP0_DISCONNECT: tmp = "ep0_disconnect"; break;
+ case EP0_IDLE: tmp = "ep0_idle"; break;
+ case EP0_IN: tmp = "ep0_in"; break;
+ case EP0_OUT: tmp = "ep0_out"; break;
+ case EP0_STATUS: tmp = "ep0_status"; break;
+ case EP0_STALL: tmp = "ep0_stall"; break;
+ case EP0_SUSPEND: tmp = "ep0_suspend"; break;
+ default: tmp = "ep0_?"; break;
+ } tmp; })
+ );
+ size -= t;
+ next += t;
+
+ dump_intmask("int_status", readl(&regs->int_status), &next, &size);
+ dump_intmask("int_enable", readl(&regs->int_enable), &next, &size);
+
+ if (!is_usb_connected || !dev->driver || (tmp & PW_PULLUP) == 0)
+ goto done;
+
+ /* registers for (active) device and ep0 */
+ t = scnprintf(next, size, "\nirqs %lu\ndataset %02x "
+ "single.bcs %02x.%02x state %x addr %u\n",
+ dev->irqs, readl(&regs->DataSet),
+ readl(&regs->EPxSingle), readl(&regs->EPxBCS),
+ readl(&regs->UsbState),
+ readl(&regs->address));
+ size -= t;
+ next += t;
+
+ tmp = readl(&regs->dma_master);
+ t = scnprintf(next, size,
+ "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");
+ size -= t;
+ next += t;
+
+ /* dump endpoint queues */
+ for (i = 0; i < 4; i++) {
+ struct goku_ep *ep = &dev->ep [i];
+ struct goku_request *req;
+ int t;
+
+ if (i && !ep->desc)
+ continue;
+
+ tmp = readl(ep->reg_status);
+ t = scnprintf(next, size,
+ "%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, ({ char *s;
+ switch (tmp & EPxSTATUS_EP_MASK) {
+ case EPxSTATUS_EP_READY:
+ s = "ready"; break;
+ case EPxSTATUS_EP_DATAIN:
+ s = "packet"; break;
+ case EPxSTATUS_EP_FULL:
+ s = "full"; break;
+ case EPxSTATUS_EP_TX_ERR: // host will retry
+ s = "tx_err"; break;
+ case EPxSTATUS_EP_RX_ERR:
+ s = "rx_err"; break;
+ case EPxSTATUS_EP_BUSY: /* ep0 only */
+ s = "busy"; break;
+ case EPxSTATUS_EP_STALL:
+ s = "stall"; break;
+ case EPxSTATUS_EP_INVALID: // these "can't happen"
+ s = "invalid"; break;
+ default:
+ s = "?"; break;
+ }; s; }),
+ (tmp & EPxSTATUS_TOGGLE) ? "data1" : "data0",
+ (tmp & EPxSTATUS_SUSPEND) ? " suspend" : "",
+ (tmp & EPxSTATUS_FIFO_DISABLE) ? " disable" : "",
+ (tmp & EPxSTATUS_STAGE_ERROR) ? " ep0stat" : ""
+ );
+ if (t <= 0 || t > size)
+ goto done;
+ size -= t;
+ next += t;
+
+ if (list_empty(&ep->queue)) {
+ t = scnprintf(next, size, "\t(nothing queued)\n");
+ if (t <= 0 || t > size)
+ goto done;
+ size -= t;
+ next += t;
+ continue;
+ }
+ list_for_each_entry(req, &ep->queue, queue) {
+ if (ep->dma && req->queue.prev == &ep->queue) {
+ if (i == UDC_MSTRD_ENDPOINT)
+ tmp = readl(&regs->in_dma_current);
+ else
+ tmp = readl(&regs->out_dma_current);
+ tmp -= req->req.dma;
+ tmp++;
+ } else
+ tmp = req->req.actual;
+
+ t = scnprintf(next, size,
+ "\treq %p len %u/%u buf %p\n",
+ &req->req, tmp, req->req.length,
+ req->req.buf);
+ if (t <= 0 || t > size)
+ goto done;
+ size -= t;
+ next += t;
+ }
+ }
+
+done:
+ local_irq_restore(flags);
+ *eof = 1;
+ return count - size;
+}
+
+#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);
+ }
+
+ dev->ep[0].reg_mode = NULL;
+ dev->ep[0].ep.maxpacket = 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, &regs->power_detect);
+ writel(0, &regs->int_enable);
+ readl(&regs->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, &regs->power_detect);
+ readl(&regs->int_enable);
+}
+
+static void ep0_start(struct goku_udc *dev)
+{
+ struct goku_udc_regs __iomem *regs = dev->regs;
+ unsigned i;
+
+ VDBG(dev, "%s\n", __FUNCTION__);
+
+ udc_reset(dev);
+ udc_reinit (dev);
+ //writel(MST_EOPB_ENA | MST_TIMEOUT_ENA, &regs->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
+ , &regs->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, &regs->descriptors[i]);
+ writel(0, &regs->UsbReady);
+
+ /* expect ep0 requests when the host drops reset */
+ writel(PW_RESETB | PW_PULLUP, &regs->power_detect);
+ dev->int_enable = INT_DEVWIDE | INT_EP0;
+ writel(dev->int_enable, &dev->regs->int_enable);
+ readl(&regs->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", __FUNCTION__);
+ 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
+ */
+
+static struct goku_udc *the_controller;
+
+/* 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.
+ */
+int usb_gadget_register_driver(struct usb_gadget_driver *driver)
+{
+ struct goku_udc *dev = the_controller;
+ int retval;
+
+ if (!driver
+ || driver->speed != USB_SPEED_FULL
+ || !driver->bind
+ || !driver->unbind
+ || !driver->disconnect
+ || !driver->setup)
+ return -EINVAL;
+ if (!dev)
+ return -ENODEV;
+ if (dev->driver)
+ return -EBUSY;
+
+ /* hook up the driver */
+ driver->driver.bus = NULL;
+ dev->driver = driver;
+ dev->gadget.dev.driver = &driver->driver;
+ retval = driver->bind(&dev->gadget);
+ if (retval) {
+ DBG(dev, "bind to driver %s --> error %d\n",
+ driver->driver.name, retval);
+ dev->driver = NULL;
+ dev->gadget.dev.driver = NULL;
+ return retval;
+ }
+
+ /* then enable host detection and ep0; and we're ready
+ * for set_configuration as well as eventual disconnect.
+ */
+ udc_enable(dev);
+
+ DBG(dev, "registered gadget driver '%s'\n", driver->driver.name);
+ return 0;
+}
+EXPORT_SYMBOL(usb_gadget_register_driver);
+
+static void
+stop_activity(struct goku_udc *dev, struct usb_gadget_driver *driver)
+{
+ unsigned i;
+
+ DBG (dev, "%s\n", __FUNCTION__);
+
+ if (dev->gadget.speed == USB_SPEED_UNKNOWN)
+ driver = NULL;
+
+ /* disconnect gadget driver after quiesceing hw and the driver */
+ udc_reset (dev);
+ for (i = 0; i < 4; i++)
+ nuke(&dev->ep [i], -ESHUTDOWN);
+ if (driver) {
+ spin_unlock(&dev->lock);
+ driver->disconnect(&dev->gadget);
+ spin_lock(&dev->lock);
+ }
+
+ if (dev->driver)
+ udc_enable(dev);
+}
+
+int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
+{
+ struct goku_udc *dev = the_controller;
+ unsigned long flags;
+
+ if (!dev)
+ return -ENODEV;
+ if (!driver || driver != dev->driver)
+ return -EINVAL;
+
+ spin_lock_irqsave(&dev->lock, flags);
+ dev->driver = NULL;
+ stop_activity(dev, driver);
+ spin_unlock_irqrestore(&dev->lock, flags);
+
+ driver->unbind(&dev->gadget);
+
+ DBG(dev, "unregistered driver '%s'\n", driver->driver.name);
+ return 0;
+}
+EXPORT_SYMBOL(usb_gadget_unregister_driver);
+
+
+/*-------------------------------------------------------------------------*/
+
+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(&regs->bRequestType);
+ ctrl.bRequest = readl(&regs->bRequest);
+ ctrl.wValue = (readl(&regs->wValueH) << 8) | readl(&regs->wValueL);
+ ctrl.wIndex = (readl(&regs->wIndexH) << 8) | readl(&regs->wIndexL);
+ ctrl.wLength = (readl(&regs->wLengthH) << 8) | readl(&regs->wLengthL);
+ writel(0, &regs->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 = ctrl.wIndex & 0x0f;
+ /* active endpoint */
+ if (tmp > 3 || (!dev->ep[tmp].desc && tmp != 0))
+ goto stall;
+ if (ctrl.wIndex & USB_DIR_IN) {
+ if (!dev->ep[tmp].is_in)
+ goto stall;
+ } else {
+ if (dev->ep[tmp].is_in)
+ goto stall;
+ }
+ if (ctrl.wValue != USB_ENDPOINT_HALT)
+ goto stall;
+ if (tmp)
+ goku_clear_halt(&dev->ep[tmp]);
+succeed:
+ /* start ep0out status stage */
+ writel(~(1<<0), &regs->EOP);
+ dev->ep[0].stopped = 1;
+ dev->ep0state = EP0_STATUS;
+ return;
+ case USB_RECIP_DEVICE:
+ /* device remote wakeup: always clear */
+ if (ctrl.wValue != 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,
+ ctrl.wValue, ctrl.wIndex, 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 != 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, &regs->int_status); \
+ handled = 1; \
+ }
+
+static irqreturn_t goku_irq(int irq, void *_dev, struct pt_regs *r)
+{
+ 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(&regs->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, dev->driver);
+ stat = 0;
+ handled = 1;
+ // FIXME have a neater way to prevent re-enumeration
+ dev->driver = NULL;
+ goto done;
+ }
+ if (stat & INT_PWRDETECT) {
+ writel(~stat, &regs->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->driver);
+ 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(&regs->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), &regs->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(&regs->int_enable);
+ spin_unlock(&dev->lock);
+ if (stat)
+ DBG(dev, "unhandled irq status: %05x (%05x, %05x)\n", stat,
+ readl(&regs->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", __FUNCTION__);
+ /* start with the driver above us */
+ if (dev->driver) {
+ /* should have been done already by driver model core */
+ WARN(dev, "pci remove, driver '%s' is still registered\n",
+ dev->driver->driver.name);
+ usb_gadget_unregister_driver(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);
+ device_unregister(&dev->gadget.dev);
+
+ pci_set_drvdata(pdev, NULL);
+ dev->regs = NULL;
+ the_controller = 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;
+ char buf [8], *bufp;
+
+ /* if you want to support more than one controller in a system,
+ * usb_gadget_driver_{register,unregister}() must change.
+ */
+ if (the_controller) {
+ WARN(dev, "ignoring %s\n", pci_name(pdev));
+ return -EBUSY;
+ }
+ if (!pdev->irq) {
+ printk(KERN_ERR "Check PCI %s IRQ setup!\n", pci_name(pdev));
+ retval = -ENODEV;
+ goto done;
+ }
+
+ /* alloc, and start init */
+ dev = kmalloc (sizeof *dev, SLAB_KERNEL);
+ if (dev == NULL){
+ pr_debug("enomem %s\n", pci_name(pdev));
+ retval = -ENOMEM;
+ goto done;
+ }
+
+ memset(dev, 0, sizeof *dev);
+ spin_lock_init(&dev->lock);
+ dev->pdev = pdev;
+ dev->gadget.ops = &goku_ops;
+
+ /* the "gadget" abstracts/virtualizes the controller */
+ strcpy(dev->gadget.dev.bus_id, "gadget");
+ dev->gadget.dev.parent = &pdev->dev;
+ dev->gadget.dev.dma_mask = pdev->dev.dma_mask;
+ dev->gadget.dev.release = gadget_release;
+ 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 done;
+ }
+ 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 done;
+ }
+ dev->got_region = 1;
+
+ base = ioremap_nocache(resource, len);
+ if (base == NULL) {
+ DBG(dev, "can't map memory\n");
+ retval = -EFAULT;
+ goto done;
+ }
+ dev->regs = (struct goku_udc_regs __iomem *) base;
+
+ pci_set_drvdata(pdev, dev);
+ INFO(dev, "%s\n", driver_desc);
+ INFO(dev, "version: " DRIVER_VERSION " %s\n", dmastr());
+#ifndef __sparc__
+ scnprintf(buf, sizeof buf, "%d", pdev->irq);
+ bufp = buf;
+#else
+ bufp = __irq_itoa(pdev->irq);
+#endif
+ INFO(dev, "irq %s, pci mem %p\n", bufp, base);
+
+ /* init to known state, then setup irqs */
+ udc_reset(dev);
+ udc_reinit (dev);
+ if (request_irq(pdev->irq, goku_irq, SA_SHIRQ/*|SA_SAMPLE_RANDOM*/,
+ driver_name, dev) != 0) {
+ DBG(dev, "request interrupt %s failed\n", bufp);
+ retval = -EBUSY;
+ goto done;
+ }
+ dev->got_irq = 1;
+ if (use_dma)
+ pci_set_master(pdev);
+
+
+#ifdef CONFIG_USB_GADGET_DEBUG_FILES
+ create_proc_read_entry(proc_node_name, 0, NULL, udc_proc_read, dev);
+#endif
+
+ /* done */
+ the_controller = dev;
+ device_register(&dev->gadget.dev);
+
+ return 0;
+
+done:
+ if (dev)
+ goku_remove (pdev);
+ return retval;
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+static struct pci_device_id pci_ids [] = { {
+ .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
+ .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 = (char *) driver_name,
+ .id_table = pci_ids,
+
+ .probe = goku_probe,
+ .remove = goku_remove,
+
+ /* FIXME add power management support */
+};
+
+static int __init init (void)
+{
+ return pci_register_driver (&goku_pci_driver);
+}
+module_init (init);
+
+static void __exit cleanup (void)
+{
+ pci_unregister_driver (&goku_pci_driver);
+}
+module_exit (cleanup);