![David Brownell](/assets/img/avatar_default.png)
Move <linux/usb_gadget.h> to <linux/usb/gadget.h>, reducing some of the clutter in the main include directory. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
1894 lines
47 KiB
C
1894 lines
47 KiB
C
/*
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* Toshiba TC86C001 ("Goku-S") USB Device Controller driver
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*
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* Copyright (C) 2000-2002 Lineo
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* by Stuart Lynne, Tom Rushworth, and Bruce Balden
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* Copyright (C) 2002 Toshiba Corporation
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* Copyright (C) 2003 MontaVista Software (source@mvista.com)
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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/*
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* This device has ep0 and three semi-configurable bulk/interrupt endpoints.
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*
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* - Endpoint numbering is fixed: ep{1,2,3}-bulk
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* - Gadget drivers can choose ep maxpacket (8/16/32/64)
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* - Gadget drivers can choose direction (IN, OUT)
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* - DMA works with ep1 (OUT transfers) and ep2 (IN transfers).
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*/
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// #define VERBOSE /* extra debug messages (success too) */
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// #define USB_TRACE /* packet-level success messages */
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/delay.h>
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#include <linux/ioport.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/timer.h>
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#include <linux/list.h>
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#include <linux/interrupt.h>
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#include <linux/proc_fs.h>
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#include <linux/device.h>
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#include <linux/usb/ch9.h>
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#include <linux/usb/gadget.h>
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#include <asm/byteorder.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/system.h>
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#include <asm/unaligned.h>
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#include "goku_udc.h"
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#define DRIVER_DESC "TC86C001 USB Device Controller"
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#define DRIVER_VERSION "30-Oct 2003"
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#define DMA_ADDR_INVALID (~(dma_addr_t)0)
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static const char driver_name [] = "goku_udc";
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static const char driver_desc [] = DRIVER_DESC;
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MODULE_AUTHOR("source@mvista.com");
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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/*
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* IN dma behaves ok under testing, though the IN-dma abort paths don't
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* seem to behave quite as expected. Used by default.
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*
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* OUT dma documents design problems handling the common "short packet"
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* transfer termination policy; it couldn't be enabled by default, even
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* if the OUT-dma abort problems had a resolution.
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*/
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static unsigned use_dma = 1;
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#if 0
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//#include <linux/moduleparam.h>
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/* "modprobe goku_udc use_dma=1" etc
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* 0 to disable dma
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* 1 to use IN dma only (normal operation)
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* 2 to use IN and OUT dma
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*/
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module_param(use_dma, uint, S_IRUGO);
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#endif
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/*-------------------------------------------------------------------------*/
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static void nuke(struct goku_ep *, int status);
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static inline void
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command(struct goku_udc_regs __iomem *regs, int command, unsigned epnum)
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{
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writel(COMMAND_EP(epnum) | command, ®s->Command);
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udelay(300);
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}
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static int
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goku_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
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{
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struct goku_udc *dev;
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struct goku_ep *ep;
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u32 mode;
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u16 max;
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unsigned long flags;
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ep = container_of(_ep, struct goku_ep, ep);
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if (!_ep || !desc || ep->desc
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|| desc->bDescriptorType != USB_DT_ENDPOINT)
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return -EINVAL;
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dev = ep->dev;
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if (ep == &dev->ep[0])
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return -EINVAL;
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if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
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return -ESHUTDOWN;
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if (ep->num != (desc->bEndpointAddress & 0x0f))
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return -EINVAL;
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switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
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case USB_ENDPOINT_XFER_BULK:
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case USB_ENDPOINT_XFER_INT:
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break;
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default:
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return -EINVAL;
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}
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if ((readl(ep->reg_status) & EPxSTATUS_EP_MASK)
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!= EPxSTATUS_EP_INVALID)
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return -EBUSY;
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/* enabling the no-toggle interrupt mode would need an api hook */
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mode = 0;
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max = le16_to_cpu(get_unaligned(&desc->wMaxPacketSize));
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switch (max) {
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case 64: mode++;
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case 32: mode++;
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case 16: mode++;
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case 8: mode <<= 3;
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break;
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default:
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return -EINVAL;
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}
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mode |= 2 << 1; /* bulk, or intr-with-toggle */
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/* ep1/ep2 dma direction is chosen early; it works in the other
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* direction, with pio. be cautious with out-dma.
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*/
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ep->is_in = (USB_DIR_IN & desc->bEndpointAddress) != 0;
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if (ep->is_in) {
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mode |= 1;
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ep->dma = (use_dma != 0) && (ep->num == UDC_MSTRD_ENDPOINT);
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} else {
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ep->dma = (use_dma == 2) && (ep->num == UDC_MSTWR_ENDPOINT);
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if (ep->dma)
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DBG(dev, "%s out-dma hides short packets\n",
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ep->ep.name);
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}
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spin_lock_irqsave(&ep->dev->lock, flags);
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/* ep1 and ep2 can do double buffering and/or dma */
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if (ep->num < 3) {
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struct goku_udc_regs __iomem *regs = ep->dev->regs;
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u32 tmp;
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/* double buffer except (for now) with pio in */
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tmp = ((ep->dma || !ep->is_in)
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? 0x10 /* double buffered */
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: 0x11 /* single buffer */
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) << ep->num;
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tmp |= readl(®s->EPxSingle);
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writel(tmp, ®s->EPxSingle);
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tmp = (ep->dma ? 0x10/*dma*/ : 0x11/*pio*/) << ep->num;
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tmp |= readl(®s->EPxBCS);
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writel(tmp, ®s->EPxBCS);
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}
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writel(mode, ep->reg_mode);
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command(ep->dev->regs, COMMAND_RESET, ep->num);
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ep->ep.maxpacket = max;
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ep->stopped = 0;
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ep->desc = desc;
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spin_unlock_irqrestore(&ep->dev->lock, flags);
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DBG(dev, "enable %s %s %s maxpacket %u\n", ep->ep.name,
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ep->is_in ? "IN" : "OUT",
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ep->dma ? "dma" : "pio",
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max);
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return 0;
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}
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static void ep_reset(struct goku_udc_regs __iomem *regs, struct goku_ep *ep)
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{
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struct goku_udc *dev = ep->dev;
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if (regs) {
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command(regs, COMMAND_INVALID, ep->num);
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if (ep->num) {
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if (ep->num == UDC_MSTWR_ENDPOINT)
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dev->int_enable &= ~(INT_MSTWREND
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|INT_MSTWRTMOUT);
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else if (ep->num == UDC_MSTRD_ENDPOINT)
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dev->int_enable &= ~INT_MSTRDEND;
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dev->int_enable &= ~INT_EPxDATASET (ep->num);
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} else
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dev->int_enable &= ~INT_EP0;
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writel(dev->int_enable, ®s->int_enable);
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readl(®s->int_enable);
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if (ep->num < 3) {
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struct goku_udc_regs __iomem *r = ep->dev->regs;
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u32 tmp;
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tmp = readl(&r->EPxSingle);
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tmp &= ~(0x11 << ep->num);
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writel(tmp, &r->EPxSingle);
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tmp = readl(&r->EPxBCS);
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tmp &= ~(0x11 << ep->num);
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writel(tmp, &r->EPxBCS);
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}
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/* reset dma in case we're still using it */
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if (ep->dma) {
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u32 master;
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master = readl(®s->dma_master) & MST_RW_BITS;
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if (ep->num == UDC_MSTWR_ENDPOINT) {
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master &= ~MST_W_BITS;
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master |= MST_WR_RESET;
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} else {
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master &= ~MST_R_BITS;
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master |= MST_RD_RESET;
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}
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writel(master, ®s->dma_master);
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}
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}
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ep->ep.maxpacket = MAX_FIFO_SIZE;
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ep->desc = NULL;
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ep->stopped = 1;
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ep->irqs = 0;
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ep->dma = 0;
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}
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static int goku_ep_disable(struct usb_ep *_ep)
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{
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struct goku_ep *ep;
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struct goku_udc *dev;
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unsigned long flags;
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ep = container_of(_ep, struct goku_ep, ep);
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if (!_ep || !ep->desc)
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return -ENODEV;
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dev = ep->dev;
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if (dev->ep0state == EP0_SUSPEND)
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return -EBUSY;
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VDBG(dev, "disable %s\n", _ep->name);
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spin_lock_irqsave(&dev->lock, flags);
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nuke(ep, -ESHUTDOWN);
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ep_reset(dev->regs, ep);
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spin_unlock_irqrestore(&dev->lock, flags);
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return 0;
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}
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/*-------------------------------------------------------------------------*/
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static struct usb_request *
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goku_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
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{
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struct goku_request *req;
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if (!_ep)
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return NULL;
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req = kzalloc(sizeof *req, gfp_flags);
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if (!req)
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return NULL;
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req->req.dma = DMA_ADDR_INVALID;
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INIT_LIST_HEAD(&req->queue);
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return &req->req;
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}
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static void
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goku_free_request(struct usb_ep *_ep, struct usb_request *_req)
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{
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struct goku_request *req;
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if (!_ep || !_req)
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return;
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req = container_of(_req, struct goku_request, req);
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WARN_ON(!list_empty(&req->queue));
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kfree(req);
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}
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/*-------------------------------------------------------------------------*/
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static void
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done(struct goku_ep *ep, struct goku_request *req, int status)
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{
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struct goku_udc *dev;
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unsigned stopped = ep->stopped;
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list_del_init(&req->queue);
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if (likely(req->req.status == -EINPROGRESS))
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req->req.status = status;
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else
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status = req->req.status;
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dev = ep->dev;
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if (req->mapped) {
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pci_unmap_single(dev->pdev, req->req.dma, req->req.length,
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ep->is_in ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
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req->req.dma = DMA_ADDR_INVALID;
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req->mapped = 0;
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}
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#ifndef USB_TRACE
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if (status && status != -ESHUTDOWN)
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#endif
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VDBG(dev, "complete %s req %p stat %d len %u/%u\n",
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ep->ep.name, &req->req, status,
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req->req.actual, req->req.length);
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/* don't modify queue heads during completion callback */
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ep->stopped = 1;
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spin_unlock(&dev->lock);
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req->req.complete(&ep->ep, &req->req);
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spin_lock(&dev->lock);
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ep->stopped = stopped;
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}
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/*-------------------------------------------------------------------------*/
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static inline int
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write_packet(u32 __iomem *fifo, u8 *buf, struct goku_request *req, unsigned max)
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{
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unsigned length, count;
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length = min(req->req.length - req->req.actual, max);
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req->req.actual += length;
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count = length;
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while (likely(count--))
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writel(*buf++, fifo);
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return length;
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}
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// return: 0 = still running, 1 = completed, negative = errno
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static int write_fifo(struct goku_ep *ep, struct goku_request *req)
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{
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struct goku_udc *dev = ep->dev;
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u32 tmp;
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u8 *buf;
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unsigned count;
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int is_last;
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tmp = readl(&dev->regs->DataSet);
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buf = req->req.buf + req->req.actual;
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prefetch(buf);
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dev = ep->dev;
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if (unlikely(ep->num == 0 && dev->ep0state != EP0_IN))
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return -EL2HLT;
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/* NOTE: just single-buffered PIO-IN for now. */
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if (unlikely((tmp & DATASET_A(ep->num)) != 0))
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return 0;
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/* clear our "packet available" irq */
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if (ep->num != 0)
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writel(~INT_EPxDATASET(ep->num), &dev->regs->int_status);
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count = write_packet(ep->reg_fifo, buf, req, ep->ep.maxpacket);
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/* last packet often short (sometimes a zlp, especially on ep0) */
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if (unlikely(count != ep->ep.maxpacket)) {
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writel(~(1<<ep->num), &dev->regs->EOP);
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if (ep->num == 0) {
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dev->ep[0].stopped = 1;
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dev->ep0state = EP0_STATUS;
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}
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is_last = 1;
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} else {
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if (likely(req->req.length != req->req.actual)
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|| req->req.zero)
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is_last = 0;
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else
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is_last = 1;
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}
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#if 0 /* printk seemed to trash is_last...*/
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//#ifdef USB_TRACE
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VDBG(dev, "wrote %s %u bytes%s IN %u left %p\n",
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ep->ep.name, count, is_last ? "/last" : "",
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req->req.length - req->req.actual, req);
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#endif
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/* requests complete when all IN data is in the FIFO,
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* or sometimes later, if a zlp was needed.
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*/
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if (is_last) {
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done(ep, req, 0);
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return 1;
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}
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return 0;
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}
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static int read_fifo(struct goku_ep *ep, struct goku_request *req)
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{
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struct goku_udc_regs __iomem *regs;
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u32 size, set;
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u8 *buf;
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unsigned bufferspace, is_short, dbuff;
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regs = ep->dev->regs;
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top:
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buf = req->req.buf + req->req.actual;
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prefetchw(buf);
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if (unlikely(ep->num == 0 && ep->dev->ep0state != EP0_OUT))
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return -EL2HLT;
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dbuff = (ep->num == 1 || ep->num == 2);
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do {
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/* ack dataset irq matching the status we'll handle */
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if (ep->num != 0)
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writel(~INT_EPxDATASET(ep->num), ®s->int_status);
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set = readl(®s->DataSet) & DATASET_AB(ep->num);
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size = readl(®s->EPxSizeLA[ep->num]);
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bufferspace = req->req.length - req->req.actual;
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/* usually do nothing without an OUT packet */
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if (likely(ep->num != 0 || bufferspace != 0)) {
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if (unlikely(set == 0))
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break;
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/* use ep1/ep2 double-buffering for OUT */
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if (!(size & PACKET_ACTIVE))
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size = readl(®s->EPxSizeLB[ep->num]);
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if (!(size & PACKET_ACTIVE)) /* "can't happen" */
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break;
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size &= DATASIZE; /* EPxSizeH == 0 */
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/* ep0out no-out-data case for set_config, etc */
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} else
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size = 0;
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/* read all bytes from this packet */
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req->req.actual += size;
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is_short = (size < ep->ep.maxpacket);
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#ifdef USB_TRACE
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VDBG(ep->dev, "read %s %u bytes%s OUT req %p %u/%u\n",
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ep->ep.name, size, is_short ? "/S" : "",
|
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req, req->req.actual, req->req.length);
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#endif
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while (likely(size-- != 0)) {
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u8 byte = (u8) readl(ep->reg_fifo);
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|
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if (unlikely(bufferspace == 0)) {
|
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/* this happens when the driver's buffer
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* is smaller than what the host sent.
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* discard the extra data in this packet.
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*/
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if (req->req.status != -EOVERFLOW)
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DBG(ep->dev, "%s overflow %u\n",
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ep->ep.name, size);
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req->req.status = -EOVERFLOW;
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} else {
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*buf++ = byte;
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bufferspace--;
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}
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}
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|
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/* completion */
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if (unlikely(is_short || req->req.actual == req->req.length)) {
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if (unlikely(ep->num == 0)) {
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/* non-control endpoints now usable? */
|
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if (ep->dev->req_config)
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writel(ep->dev->configured
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? USBSTATE_CONFIGURED
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: 0,
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®s->UsbState);
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/* ep0out status stage */
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writel(~(1<<0), ®s->EOP);
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ep->stopped = 1;
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ep->dev->ep0state = EP0_STATUS;
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}
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done(ep, req, 0);
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|
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/* empty the second buffer asap */
|
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if (dbuff && !list_empty(&ep->queue)) {
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req = list_entry(ep->queue.next,
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struct goku_request, queue);
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goto top;
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}
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return 1;
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}
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} while (dbuff);
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return 0;
|
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}
|
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|
|
static inline void
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pio_irq_enable(struct goku_udc *dev,
|
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struct goku_udc_regs __iomem *regs, int epnum)
|
|
{
|
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dev->int_enable |= INT_EPxDATASET (epnum);
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writel(dev->int_enable, ®s->int_enable);
|
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/* write may still be posted */
|
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}
|
|
|
|
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", __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, 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->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(®s->EPxSizeLA[ep->num]) & DATASIZE;
|
|
size += readl(®s->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(®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 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 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(®s->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 *state;
|
|
switch(dev->ep0state){
|
|
case EP0_DISCONNECT: state = "ep0_disconnect"; break;
|
|
case EP0_IDLE: state = "ep0_idle"; break;
|
|
case EP0_IN: state = "ep0_in"; break;
|
|
case EP0_OUT: state = "ep0_out"; break;
|
|
case EP0_STATUS: state = "ep0_status"; break;
|
|
case EP0_STALL: state = "ep0_stall"; break;
|
|
case EP0_SUSPEND: state = "ep0_suspend"; break;
|
|
default: state = "ep0_?"; break;
|
|
} state; })
|
|
);
|
|
size -= t;
|
|
next += t;
|
|
|
|
dump_intmask("int_status", readl(®s->int_status), &next, &size);
|
|
dump_intmask("int_enable", readl(®s->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(®s->DataSet),
|
|
readl(®s->EPxSingle), readl(®s->EPxBCS),
|
|
readl(®s->UsbState),
|
|
readl(®s->address));
|
|
size -= t;
|
|
next += t;
|
|
|
|
tmp = readl(®s->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;
|
|
|
|
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(®s->in_dma_current);
|
|
else
|
|
tmp = readl(®s->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, ®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", __FUNCTION__);
|
|
|
|
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", __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->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 || !driver->unbind)
|
|
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(®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].desc && tmp != 0))
|
|
goto stall;
|
|
if (ctrl.wIndex & __constant_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 != __constant_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 != __constant_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 != __constant_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, 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, ®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->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(®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", __FUNCTION__);
|
|
|
|
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);
|
|
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;
|
|
|
|
/* 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 = kzalloc (sizeof *dev, GFP_KERNEL);
|
|
if (dev == NULL){
|
|
pr_debug("enomem %s\n", pci_name(pdev));
|
|
retval = -ENOMEM;
|
|
goto done;
|
|
}
|
|
|
|
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());
|
|
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/*|IRQF_SAMPLE_RANDOM*/,
|
|
driver_name, dev) != 0) {
|
|
DBG(dev, "request interrupt %d failed\n", pdev->irq);
|
|
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;
|
|
retval = device_register(&dev->gadget.dev);
|
|
if (retval == 0)
|
|
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);
|