diff options
Diffstat (limited to 'drivers/usb/gadget/net2280.c')
| -rw-r--r-- | drivers/usb/gadget/net2280.c | 2905 |
1 files changed, 0 insertions, 2905 deletions
diff --git a/drivers/usb/gadget/net2280.c b/drivers/usb/gadget/net2280.c deleted file mode 100644 index 300b3a7..0000000 --- a/drivers/usb/gadget/net2280.c +++ /dev/null @@ -1,2905 +0,0 @@ -/* - * Driver for the PLX NET2280 USB device controller. - * Specs and errata are available from <http://www.plxtech.com>. - * - * PLX Technology Inc. (formerly NetChip Technology) supported the - * development of this driver. - * - * - * CODE STATUS HIGHLIGHTS - * - * This driver should work well with most "gadget" drivers, including - * the Mass Storage, Serial, and Ethernet/RNDIS gadget drivers - * as well as Gadget Zero and Gadgetfs. - * - * DMA is enabled by default. Drivers using transfer queues might use - * DMA chaining to remove IRQ latencies between transfers. (Except when - * short OUT transfers happen.) Drivers can use the req->no_interrupt - * hint to completely eliminate some IRQs, if a later IRQ is guaranteed - * and DMA chaining is enabled. - * - * Note that almost all the errata workarounds here are only needed for - * rev1 chips. Rev1a silicon (0110) fixes almost all of them. - */ - -/* - * Copyright (C) 2003 David Brownell - * Copyright (C) 2003-2005 PLX Technology, Inc. - * - * Modified Seth Levy 2005 PLX Technology, Inc. to provide compatibility - * with 2282 chip - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - */ - -#undef DEBUG /* messages on error and most fault paths */ -#undef VERBOSE /* extra debug messages (success too) */ - -#include <linux/module.h> -#include <linux/pci.h> -#include <linux/dma-mapping.h> -#include <linux/kernel.h> -#include <linux/delay.h> -#include <linux/ioport.h> -#include <linux/slab.h> -#include <linux/errno.h> -#include <linux/init.h> -#include <linux/timer.h> -#include <linux/list.h> -#include <linux/interrupt.h> -#include <linux/moduleparam.h> -#include <linux/device.h> -#include <linux/usb/ch9.h> -#include <linux/usb/gadget.h> -#include <linux/prefetch.h> - -#include <asm/byteorder.h> -#include <asm/io.h> -#include <asm/irq.h> -#include <asm/unaligned.h> - - -#define DRIVER_DESC "PLX NET228x USB Peripheral Controller" -#define DRIVER_VERSION "2005 Sept 27" - -#define EP_DONTUSE 13 /* nonzero */ - -#define USE_RDK_LEDS /* GPIO pins control three LEDs */ - - -static const char driver_name [] = "net2280"; -static const char driver_desc [] = DRIVER_DESC; - -static const char ep0name [] = "ep0"; -static const char *const ep_name [] = { - ep0name, - "ep-a", "ep-b", "ep-c", "ep-d", - "ep-e", "ep-f", -}; - -/* use_dma -- general goodness, fewer interrupts, less cpu load (vs PIO) - * use_dma_chaining -- dma descriptor queueing gives even more irq reduction - * - * The net2280 DMA engines are not tightly integrated with their FIFOs; - * not all cases are (yet) handled well in this driver or the silicon. - * Some gadget drivers work better with the dma support here than others. - * These two parameters let you use PIO or more aggressive DMA. - */ -static bool use_dma = 1; -static bool use_dma_chaining = 0; - -/* "modprobe net2280 use_dma=n" etc */ -module_param (use_dma, bool, S_IRUGO); -module_param (use_dma_chaining, bool, S_IRUGO); - - -/* mode 0 == ep-{a,b,c,d} 1K fifo each - * mode 1 == ep-{a,b} 2K fifo each, ep-{c,d} unavailable - * mode 2 == ep-a 2K fifo, ep-{b,c} 1K each, ep-d unavailable - */ -static ushort fifo_mode = 0; - -/* "modprobe net2280 fifo_mode=1" etc */ -module_param (fifo_mode, ushort, 0644); - -/* enable_suspend -- When enabled, the driver will respond to - * USB suspend requests by powering down the NET2280. Otherwise, - * USB suspend requests will be ignored. This is acceptable for - * self-powered devices - */ -static bool enable_suspend = 0; - -/* "modprobe net2280 enable_suspend=1" etc */ -module_param (enable_suspend, bool, S_IRUGO); - -/* force full-speed operation */ -static bool full_speed; -module_param(full_speed, bool, 0444); -MODULE_PARM_DESC(full_speed, "force full-speed mode -- for testing only!"); - -#define DIR_STRING(bAddress) (((bAddress) & USB_DIR_IN) ? "in" : "out") - -#if defined(CONFIG_USB_GADGET_DEBUG_FILES) || defined (DEBUG) -static char *type_string (u8 bmAttributes) -{ - switch ((bmAttributes) & USB_ENDPOINT_XFERTYPE_MASK) { - case USB_ENDPOINT_XFER_BULK: return "bulk"; - case USB_ENDPOINT_XFER_ISOC: return "iso"; - case USB_ENDPOINT_XFER_INT: return "intr"; - } - return "control"; -} -#endif - -#include "net2280.h" - -#define valid_bit cpu_to_le32 (1 << VALID_BIT) -#define dma_done_ie cpu_to_le32 (1 << DMA_DONE_INTERRUPT_ENABLE) - -/*-------------------------------------------------------------------------*/ - -static int -net2280_enable (struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc) -{ - struct net2280 *dev; - struct net2280_ep *ep; - u32 max, tmp; - unsigned long flags; - - ep = container_of (_ep, struct net2280_ep, ep); - if (!_ep || !desc || ep->desc || _ep->name == ep0name - || desc->bDescriptorType != USB_DT_ENDPOINT) - return -EINVAL; - dev = ep->dev; - if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) - return -ESHUTDOWN; - - /* erratum 0119 workaround ties up an endpoint number */ - if ((desc->bEndpointAddress & 0x0f) == EP_DONTUSE) - return -EDOM; - - /* sanity check ep-e/ep-f since their fifos are small */ - max = usb_endpoint_maxp (desc) & 0x1fff; - if (ep->num > 4 && max > 64) - return -ERANGE; - - spin_lock_irqsave (&dev->lock, flags); - _ep->maxpacket = max & 0x7ff; - ep->desc = desc; - - /* ep_reset() has already been called */ - ep->stopped = 0; - ep->wedged = 0; - ep->out_overflow = 0; - - /* set speed-dependent max packet; may kick in high bandwidth */ - set_idx_reg (dev->regs, REG_EP_MAXPKT (dev, ep->num), max); - - /* FIFO lines can't go to different packets. PIO is ok, so - * use it instead of troublesome (non-bulk) multi-packet DMA. - */ - if (ep->dma && (max % 4) != 0 && use_dma_chaining) { - DEBUG (ep->dev, "%s, no dma for maxpacket %d\n", - ep->ep.name, ep->ep.maxpacket); - ep->dma = NULL; - } - - /* set type, direction, address; reset fifo counters */ - writel ((1 << FIFO_FLUSH), &ep->regs->ep_stat); - tmp = (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK); - if (tmp == USB_ENDPOINT_XFER_INT) { - /* erratum 0105 workaround prevents hs NYET */ - if (dev->chiprev == 0100 - && dev->gadget.speed == USB_SPEED_HIGH - && !(desc->bEndpointAddress & USB_DIR_IN)) - writel ((1 << CLEAR_NAK_OUT_PACKETS_MODE), - &ep->regs->ep_rsp); - } else if (tmp == USB_ENDPOINT_XFER_BULK) { - /* catch some particularly blatant driver bugs */ - if ((dev->gadget.speed == USB_SPEED_HIGH - && max != 512) - || (dev->gadget.speed == USB_SPEED_FULL - && max > 64)) { - spin_unlock_irqrestore (&dev->lock, flags); - return -ERANGE; - } - } - ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC) ? 1 : 0; - tmp <<= ENDPOINT_TYPE; - tmp |= desc->bEndpointAddress; - tmp |= (4 << ENDPOINT_BYTE_COUNT); /* default full fifo lines */ - tmp |= 1 << ENDPOINT_ENABLE; - wmb (); - - /* for OUT transfers, block the rx fifo until a read is posted */ - ep->is_in = (tmp & USB_DIR_IN) != 0; - if (!ep->is_in) - writel ((1 << SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp); - else if (dev->pdev->device != 0x2280) { - /* Added for 2282, Don't use nak packets on an in endpoint, - * this was ignored on 2280 - */ - writel ((1 << CLEAR_NAK_OUT_PACKETS) - | (1 << CLEAR_NAK_OUT_PACKETS_MODE), &ep->regs->ep_rsp); - } - - writel (tmp, &ep->regs->ep_cfg); - - /* enable irqs */ - if (!ep->dma) { /* pio, per-packet */ - tmp = (1 << ep->num) | readl (&dev->regs->pciirqenb0); - writel (tmp, &dev->regs->pciirqenb0); - - tmp = (1 << DATA_PACKET_RECEIVED_INTERRUPT_ENABLE) - | (1 << DATA_PACKET_TRANSMITTED_INTERRUPT_ENABLE); - if (dev->pdev->device == 0x2280) - tmp |= readl (&ep->regs->ep_irqenb); - writel (tmp, &ep->regs->ep_irqenb); - } else { /* dma, per-request */ - tmp = (1 << (8 + ep->num)); /* completion */ - tmp |= readl (&dev->regs->pciirqenb1); - writel (tmp, &dev->regs->pciirqenb1); - - /* for short OUT transfers, dma completions can't - * advance the queue; do it pio-style, by hand. - * NOTE erratum 0112 workaround #2 - */ - if ((desc->bEndpointAddress & USB_DIR_IN) == 0) { - tmp = (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT_ENABLE); - writel (tmp, &ep->regs->ep_irqenb); - - tmp = (1 << ep->num) | readl (&dev->regs->pciirqenb0); - writel (tmp, &dev->regs->pciirqenb0); - } - } - - tmp = desc->bEndpointAddress; - DEBUG (dev, "enabled %s (ep%d%s-%s) %s max %04x\n", - _ep->name, tmp & 0x0f, DIR_STRING (tmp), - type_string (desc->bmAttributes), - ep->dma ? "dma" : "pio", max); - - /* pci writes may still be posted */ - spin_unlock_irqrestore (&dev->lock, flags); - return 0; -} - -static int handshake (u32 __iomem *ptr, u32 mask, u32 done, int usec) -{ - u32 result; - - do { - result = readl (ptr); - if (result == ~(u32)0) /* "device unplugged" */ - return -ENODEV; - result &= mask; - if (result == done) - return 0; - udelay (1); - usec--; - } while (usec > 0); - return -ETIMEDOUT; -} - -static const struct usb_ep_ops net2280_ep_ops; - -static void ep_reset (struct net2280_regs __iomem *regs, struct net2280_ep *ep) -{ - u32 tmp; - - ep->desc = NULL; - INIT_LIST_HEAD (&ep->queue); - - usb_ep_set_maxpacket_limit(&ep->ep, ~0); - ep->ep.ops = &net2280_ep_ops; - - /* disable the dma, irqs, endpoint... */ - if (ep->dma) { - writel (0, &ep->dma->dmactl); - writel ( (1 << DMA_SCATTER_GATHER_DONE_INTERRUPT) - | (1 << DMA_TRANSACTION_DONE_INTERRUPT) - | (1 << DMA_ABORT) - , &ep->dma->dmastat); - - tmp = readl (®s->pciirqenb0); - tmp &= ~(1 << ep->num); - writel (tmp, ®s->pciirqenb0); - } else { - tmp = readl (®s->pciirqenb1); - tmp &= ~(1 << (8 + ep->num)); /* completion */ - writel (tmp, ®s->pciirqenb1); - } - writel (0, &ep->regs->ep_irqenb); - - /* init to our chosen defaults, notably so that we NAK OUT - * packets until the driver queues a read (+note erratum 0112) - */ - if (!ep->is_in || ep->dev->pdev->device == 0x2280) { - tmp = (1 << SET_NAK_OUT_PACKETS_MODE) - | (1 << SET_NAK_OUT_PACKETS) - | (1 << CLEAR_EP_HIDE_STATUS_PHASE) - | (1 << CLEAR_INTERRUPT_MODE); - } else { - /* added for 2282 */ - tmp = (1 << CLEAR_NAK_OUT_PACKETS_MODE) - | (1 << CLEAR_NAK_OUT_PACKETS) - | (1 << CLEAR_EP_HIDE_STATUS_PHASE) - | (1 << CLEAR_INTERRUPT_MODE); - } - - if (ep->num != 0) { - tmp |= (1 << CLEAR_ENDPOINT_TOGGLE) - | (1 << CLEAR_ENDPOINT_HALT); - } - writel (tmp, &ep->regs->ep_rsp); - - /* scrub most status bits, and flush any fifo state */ - if (ep->dev->pdev->device == 0x2280) - tmp = (1 << FIFO_OVERFLOW) - | (1 << FIFO_UNDERFLOW); - else - tmp = 0; - - writel (tmp | (1 << TIMEOUT) - | (1 << USB_STALL_SENT) - | (1 << USB_IN_NAK_SENT) - | (1 << USB_IN_ACK_RCVD) - | (1 << USB_OUT_PING_NAK_SENT) - | (1 << USB_OUT_ACK_SENT) - | (1 << FIFO_FLUSH) - | (1 << SHORT_PACKET_OUT_DONE_INTERRUPT) - | (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT) - | (1 << DATA_PACKET_RECEIVED_INTERRUPT) - | (1 << DATA_PACKET_TRANSMITTED_INTERRUPT) - | (1 << DATA_OUT_PING_TOKEN_INTERRUPT) - | (1 << DATA_IN_TOKEN_INTERRUPT) - , &ep->regs->ep_stat); - - /* fifo size is handled separately */ -} - -static void nuke (struct net2280_ep *); - -static int net2280_disable (struct usb_ep *_ep) -{ - struct net2280_ep *ep; - unsigned long flags; - - ep = container_of (_ep, struct net2280_ep, ep); - if (!_ep || !ep->desc || _ep->name == ep0name) - return -EINVAL; - - spin_lock_irqsave (&ep->dev->lock, flags); - nuke (ep); - ep_reset (ep->dev->regs, ep); - - VDEBUG (ep->dev, "disabled %s %s\n", - ep->dma ? "dma" : "pio", _ep->name); - - /* synch memory views with the device */ - (void) readl (&ep->regs->ep_cfg); - - if (use_dma && !ep->dma && ep->num >= 1 && ep->num <= 4) - ep->dma = &ep->dev->dma [ep->num - 1]; - - spin_unlock_irqrestore (&ep->dev->lock, flags); - return 0; -} - -/*-------------------------------------------------------------------------*/ - -static struct usb_request * -net2280_alloc_request (struct usb_ep *_ep, gfp_t gfp_flags) -{ - struct net2280_ep *ep; - struct net2280_request *req; - - if (!_ep) - return NULL; - ep = container_of (_ep, struct net2280_ep, ep); - - req = kzalloc(sizeof(*req), gfp_flags); - if (!req) - return NULL; - - INIT_LIST_HEAD (&req->queue); - - /* this dma descriptor may be swapped with the previous dummy */ - if (ep->dma) { - struct net2280_dma *td; - - td = pci_pool_alloc (ep->dev->requests, gfp_flags, - &req->td_dma); - if (!td) { - kfree (req); - return NULL; - } - td->dmacount = 0; /* not VALID */ - td->dmadesc = td->dmaaddr; - req->td = td; - } - return &req->req; -} - -static void -net2280_free_request (struct usb_ep *_ep, struct usb_request *_req) -{ - struct net2280_ep *ep; - struct net2280_request *req; - - ep = container_of (_ep, struct net2280_ep, ep); - if (!_ep || !_req) - return; - - req = container_of (_req, struct net2280_request, req); - WARN_ON (!list_empty (&req->queue)); - if (req->td) - pci_pool_free (ep->dev->requests, req->td, req->td_dma); - kfree (req); -} - -/*-------------------------------------------------------------------------*/ - -/* load a packet into the fifo we use for usb IN transfers. - * works for all endpoints. - * - * NOTE: pio with ep-a..ep-d could stuff multiple packets into the fifo - * at a time, but this code is simpler because it knows it only writes - * one packet. ep-a..ep-d should use dma instead. - */ -static void -write_fifo (struct net2280_ep *ep, struct usb_request *req) -{ - struct net2280_ep_regs __iomem *regs = ep->regs; - u8 *buf; - u32 tmp; - unsigned count, total; - - /* INVARIANT: fifo is currently empty. (testable) */ - - if (req) { - buf = req->buf + req->actual; - prefetch (buf); - total = req->length - req->actual; - } else { - total = 0; - buf = NULL; - } - - /* write just one packet at a time */ - count = ep->ep.maxpacket; - if (count > total) /* min() cannot be used on a bitfield */ - count = total; - - VDEBUG (ep->dev, "write %s fifo (IN) %d bytes%s req %p\n", - ep->ep.name, count, - (count != ep->ep.maxpacket) ? " (short)" : "", - req); - while (count >= 4) { - /* NOTE be careful if you try to align these. fifo lines - * should normally be full (4 bytes) and successive partial - * lines are ok only in certain cases. - */ - tmp = get_unaligned ((u32 *)buf); - cpu_to_le32s (&tmp); - writel (tmp, ®s->ep_data); - buf += 4; - count -= 4; - } - - /* last fifo entry is "short" unless we wrote a full packet. - * also explicitly validate last word in (periodic) transfers - * when maxpacket is not a multiple of 4 bytes. - */ - if (count || total < ep->ep.maxpacket) { - tmp = count ? get_unaligned ((u32 *)buf) : count; - cpu_to_le32s (&tmp); - set_fifo_bytecount (ep, count & 0x03); - writel (tmp, ®s->ep_data); - } - - /* pci writes may still be posted */ -} - -/* work around erratum 0106: PCI and USB race over the OUT fifo. - * caller guarantees chiprev 0100, out endpoint is NAKing, and - * there's no real data in the fifo. - * - * NOTE: also used in cases where that erratum doesn't apply: - * where the host wrote "too much" data to us. - */ -static void out_flush (struct net2280_ep *ep) -{ - u32 __iomem *statp; - u32 tmp; - - ASSERT_OUT_NAKING (ep); - - statp = &ep->regs->ep_stat; - writel ( (1 << DATA_OUT_PING_TOKEN_INTERRUPT) - | (1 << DATA_PACKET_RECEIVED_INTERRUPT) - , statp); - writel ((1 << FIFO_FLUSH), statp); - mb (); - tmp = readl (statp); - if (tmp & (1 << DATA_OUT_PING_TOKEN_INTERRUPT) - /* high speed did bulk NYET; fifo isn't filling */ - && ep->dev->gadget.speed == USB_SPEED_FULL) { - unsigned usec; - - usec = 50; /* 64 byte bulk/interrupt */ - handshake (statp, (1 << USB_OUT_PING_NAK_SENT), - (1 << USB_OUT_PING_NAK_SENT), usec); - /* NAK done; now CLEAR_NAK_OUT_PACKETS is safe */ - } -} - -/* unload packet(s) from the fifo we use for usb OUT transfers. - * returns true iff the request completed, because of short packet - * or the request buffer having filled with full packets. - * - * for ep-a..ep-d this will read multiple packets out when they - * have been accepted. - */ -static int -read_fifo (struct net2280_ep *ep, struct net2280_request *req) -{ - struct net2280_ep_regs __iomem *regs = ep->regs; - u8 *buf = req->req.buf + req->req.actual; - unsigned count, tmp, is_short; - unsigned cleanup = 0, prevent = 0; - - /* erratum 0106 ... packets coming in during fifo reads might - * be incompletely rejected. not all cases have workarounds. - */ - if (ep->dev->chiprev == 0x0100 - && ep->dev->gadget.speed == USB_SPEED_FULL) { - udelay (1); - tmp = readl (&ep->regs->ep_stat); - if ((tmp & (1 << NAK_OUT_PACKETS))) - cleanup = 1; - else if ((tmp & (1 << FIFO_FULL))) { - start_out_naking (ep); - prevent = 1; - } - /* else: hope we don't see the problem */ - } - - /* never overflow the rx buffer. the fifo reads packets until - * it sees a short one; we might not be ready for them all. - */ - prefetchw (buf); - count = readl (®s->ep_avail); - if (unlikely (count == 0)) { - udelay (1); - tmp = readl (&ep->regs->ep_stat); - count = readl (®s->ep_avail); - /* handled that data already? */ - if (count == 0 && (tmp & (1 << NAK_OUT_PACKETS)) == 0) - return 0; - } - - tmp = req->req.length - req->req.actual; - if (count > tmp) { - /* as with DMA, data overflow gets flushed */ - if ((tmp % ep->ep.maxpacket) != 0) { - ERROR (ep->dev, - "%s out fifo %d bytes, expected %d\n", - ep->ep.name, count, tmp); - req->req.status = -EOVERFLOW; - cleanup = 1; - /* NAK_OUT_PACKETS will be set, so flushing is safe; - * the next read will start with the next packet - */ - } /* else it's a ZLP, no worries */ - count = tmp; - } - req->req.actual += count; - - is_short = (count == 0) || ((count % ep->ep.maxpacket) != 0); - - VDEBUG (ep->dev, "read %s fifo (OUT) %d bytes%s%s%s req %p %d/%d\n", - ep->ep.name, count, is_short ? " (short)" : "", - cleanup ? " flush" : "", prevent ? " nak" : "", - req, req->req.actual, req->req.length); - - while (count >= 4) { - tmp = readl (®s->ep_data); - cpu_to_le32s (&tmp); - put_unaligned (tmp, (u32 *)buf); - buf += 4; - count -= 4; - } - if (count) { - tmp = readl (®s->ep_data); - /* LE conversion is implicit here: */ - do { - *buf++ = (u8) tmp; - tmp >>= 8; - } while (--count); - } - if (cleanup) - out_flush (ep); - if (prevent) { - writel ((1 << CLEAR_NAK_OUT_PACKETS), &ep->regs->ep_rsp); - (void) readl (&ep->regs->ep_rsp); - } - - return is_short || ((req->req.actual == req->req.length) - && !req->req.zero); -} - -/* fill out dma descriptor to match a given request */ -static void -fill_dma_desc (struct net2280_ep *ep, struct net2280_request *req, int valid) -{ - struct net2280_dma *td = req->td; - u32 dmacount = req->req.length; - - /* don't let DMA continue after a short OUT packet, - * so overruns can't affect the next transfer. - * in case of overruns on max-size packets, we can't - * stop the fifo from filling but we can flush it. - */ - if (ep->is_in) - dmacount |= (1 << DMA_DIRECTION); - if ((!ep->is_in && (dmacount % ep->ep.maxpacket) != 0) - || ep->dev->pdev->device != 0x2280) - dmacount |= (1 << END_OF_CHAIN); - - req->valid = valid; - if (valid) - dmacount |= (1 << VALID_BIT); - if (likely(!req->req.no_interrupt || !use_dma_chaining)) - dmacount |= (1 << DMA_DONE_INTERRUPT_ENABLE); - - /* td->dmadesc = previously set by caller */ - td->dmaaddr = cpu_to_le32 (req->req.dma); - - /* 2280 may be polling VALID_BIT through ep->dma->dmadesc */ - wmb (); - td->dmacount = cpu_to_le32(dmacount); -} - -static const u32 dmactl_default = - (1 << DMA_SCATTER_GATHER_DONE_INTERRUPT) - | (1 << DMA_CLEAR_COUNT_ENABLE) - /* erratum 0116 workaround part 1 (use POLLING) */ - | (POLL_100_USEC << DESCRIPTOR_POLLING_RATE) - | (1 << DMA_VALID_BIT_POLLING_ENABLE) - | (1 << DMA_VALID_BIT_ENABLE) - | (1 << DMA_SCATTER_GATHER_ENABLE) - /* erratum 0116 workaround part 2 (no AUTOSTART) */ - | (1 << DMA_ENABLE); - -static inline void spin_stop_dma (struct net2280_dma_regs __iomem *dma) -{ - handshake (&dma->dmactl, (1 << DMA_ENABLE), 0, 50); -} - -static inline void stop_dma (struct net2280_dma_regs __iomem *dma) -{ - writel (readl (&dma->dmactl) & ~(1 << DMA_ENABLE), &dma->dmactl); - spin_stop_dma (dma); -} - -static void start_queue (struct net2280_ep *ep, u32 dmactl, u32 td_dma) -{ - struct net2280_dma_regs __iomem *dma = ep->dma; - unsigned int tmp = (1 << VALID_BIT) | (ep->is_in << DMA_DIRECTION); - - if (ep->dev->pdev->device != 0x2280) - tmp |= (1 << END_OF_CHAIN); - - writel (tmp, &dma->dmacount); - writel (readl (&dma->dmastat), &dma->dmastat); - - writel (td_dma, &dma->dmadesc); - writel (dmactl, &dma->dmactl); - - /* erratum 0116 workaround part 3: pci arbiter away from net2280 */ - (void) readl (&ep->dev->pci->pcimstctl); - - writel ((1 << DMA_START), &dma->dmastat); - - if (!ep->is_in) - stop_out_naking (ep); -} - -static void start_dma (struct net2280_ep *ep, struct net2280_request *req) -{ - u32 tmp; - struct net2280_dma_regs __iomem *dma = ep->dma; - - /* FIXME can't use DMA for ZLPs */ - - /* on this path we "know" there's no dma active (yet) */ - WARN_ON (readl (&dma->dmactl) & (1 << DMA_ENABLE)); - writel (0, &ep->dma->dmactl); - - /* previous OUT packet might have been short */ - if (!ep->is_in && ((tmp = readl (&ep->regs->ep_stat)) - & (1 << NAK_OUT_PACKETS)) != 0) { - writel ((1 << SHORT_PACKET_TRANSFERRED_INTERRUPT), - &ep->regs->ep_stat); - - tmp = readl (&ep->regs->ep_avail); - if (tmp) { - writel (readl (&dma->dmastat), &dma->dmastat); - - /* transfer all/some fifo data */ - writel (req->req.dma, &dma->dmaaddr); - tmp = min (tmp, req->req.length); - - /* dma irq, faking scatterlist status */ - req->td->dmacount = cpu_to_le32 (req->req.length - tmp); - writel ((1 << DMA_DONE_INTERRUPT_ENABLE) - | tmp, &dma->dmacount); - req->td->dmadesc = 0; - req->valid = 1; - - writel ((1 << DMA_ENABLE), &dma->dmactl); - writel ((1 << DMA_START), &dma->dmastat); - return; - } - } - - tmp = dmactl_default; - - /* force packet boundaries between dma requests, but prevent the - * controller from automagically writing a last "short" packet - * (zero length) unless the driver explicitly said to do that. - */ - if (ep->is_in) { - if (likely ((req->req.length % ep->ep.maxpacket) != 0 - || req->req.zero)) { - tmp |= (1 << DMA_FIFO_VALIDATE); - ep->in_fifo_validate = 1; - } else - ep->in_fifo_validate = 0; - } - - /* init req->td, pointing to the current dummy */ - req->td->dmadesc = cpu_to_le32 (ep->td_dma); - fill_dma_desc (ep, req, 1); - - if (!use_dma_chaining) - req->td->dmacount |= cpu_to_le32 (1 << END_OF_CHAIN); - - start_queue (ep, tmp, req->td_dma); -} - -static inline void -queue_dma (struct net2280_ep *ep, struct net2280_request *req, int valid) -{ - struct net2280_dma *end; - dma_addr_t tmp; - - /* swap new dummy for old, link; fill and maybe activate */ - end = ep->dummy; - ep->dummy = req->td; - req->td = end; - - tmp = ep->td_dma; - ep->td_dma = req->td_dma; - req->td_dma = tmp; - - end->dmadesc = cpu_to_le32 (ep->td_dma); - - fill_dma_desc (ep, req, valid); -} - -static void -done (struct net2280_ep *ep, struct net2280_request *req, int status) -{ - struct net2280 *dev; - unsigned stopped = ep->stopped; - - list_del_init (&req->queue); - - if (req->req.status == -EINPROGRESS) - req->req.status = status; - else - status = req->req.status; - - dev = ep->dev; - if (ep->dma) - usb_gadget_unmap_request(&dev->gadget, &req->req, ep->is_in); - - if (status && status != -ESHUTDOWN) - VDEBUG (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 int -net2280_queue (struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags) -{ - struct net2280_request *req; - struct net2280_ep *ep; - struct net2280 *dev; - unsigned long flags; - - /* we always require a cpu-view buffer, so that we can - * always use pio (as fallback or whatever). - */ - req = container_of (_req, struct net2280_request, req); - if (!_req || !_req->complete || !_req->buf - || !list_empty (&req->queue)) - return -EINVAL; - if (_req->length > (~0 & DMA_BYTE_COUNT_MASK)) - return -EDOM; - ep = container_of (_ep, struct net2280_ep, ep); - if (!_ep || (!ep->desc && ep->num != 0)) - return -EINVAL; - dev = ep->dev; - if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) - return -ESHUTDOWN; - - /* FIXME implement PIO fallback for ZLPs with DMA */ - if (ep->dma && _req->length == 0) - return -EOPNOTSUPP; - - /* set up dma mapping in case the caller didn't */ - if (ep->dma) { - int ret; - - ret = usb_gadget_map_request(&dev->gadget, _req, - ep->is_in); - if (ret) - return ret; - } - -#if 0 - VDEBUG (dev, "%s queue req %p, len %d buf %p\n", - _ep->name, _req, _req->length, _req->buf); -#endif - - spin_lock_irqsave (&dev->lock, flags); - - _req->status = -EINPROGRESS; - _req->actual = 0; - - /* kickstart this i/o queue? */ - if (list_empty (&ep->queue) && !ep->stopped) { - /* use DMA if the endpoint supports it, else pio */ - if (ep->dma) - start_dma (ep, req); - else { - /* maybe there's no control data, just status ack */ - if (ep->num == 0 && _req->length == 0) { - allow_status (ep); - done (ep, req, 0); - VDEBUG (dev, "%s status ack\n", ep->ep.name); - goto done; - } - - /* PIO ... stuff the fifo, or unblock it. */ - if (ep->is_in) - write_fifo (ep, _req); - else if (list_empty (&ep->queue)) { - u32 s; - - /* OUT FIFO might have packet(s) buffered */ - s = readl (&ep->regs->ep_stat); - if ((s & (1 << FIFO_EMPTY)) == 0) { - /* note: _req->short_not_ok is - * ignored here since PIO _always_ - * stops queue advance here, and - * _req->status doesn't change for - * short reads (only _req->actual) - */ - if (read_fifo (ep, req)) { - done (ep, req, 0); - if (ep->num == 0) - allow_status (ep); - /* don't queue it */ - req = NULL; - } else - s = readl (&ep->regs->ep_stat); - } - - /* don't NAK, let the fifo fill */ - if (req && (s & (1 << NAK_OUT_PACKETS))) - writel ((1 << CLEAR_NAK_OUT_PACKETS), - &ep->regs->ep_rsp); - } - } - - } else if (ep->dma) { - int valid = 1; - - if (ep->is_in) { - int expect; - - /* preventing magic zlps is per-engine state, not - * per-transfer; irq logic must recover hiccups. - */ - expect = likely (req->req.zero - || (req->req.length % ep->ep.maxpacket) != 0); - if (expect != ep->in_fifo_validate) - valid = 0; - } - queue_dma (ep, req, valid); - - } /* else the irq handler advances the queue. */ - - ep->responded = 1; - if (req) - list_add_tail (&req->queue, &ep->queue); -done: - spin_unlock_irqrestore (&dev->lock, flags); - - /* pci writes may still be posted */ - return 0; -} - -static inline void -dma_done ( - struct net2280_ep *ep, - struct net2280_request *req, - u32 dmacount, - int status -) -{ - req->req.actual = req->req.length - (DMA_BYTE_COUNT_MASK & dmacount); - done (ep, req, status); -} - -static void restart_dma (struct net2280_ep *ep); - -static void scan_dma_completions (struct net2280_ep *ep) -{ - /* only look at descriptors that were "naturally" retired, - * so fifo and list head state won't matter - */ - while (!list_empty (&ep->queue)) { - struct net2280_request *req; - u32 tmp; - - req = list_entry (ep->queue.next, - struct net2280_request, queue); - if (!req->valid) - break; - rmb (); - tmp = le32_to_cpup (&req->td->dmacount); - if ((tmp & (1 << VALID_BIT)) != 0) - break; - - /* SHORT_PACKET_TRANSFERRED_INTERRUPT handles "usb-short" - * cases where DMA must be aborted; this code handles - * all non-abort DMA completions. - */ - if (unlikely (req->td->dmadesc == 0)) { - /* paranoia */ - tmp = readl (&ep->dma->dmacount); - if (tmp & DMA_BYTE_COUNT_MASK) - break; - /* single transfer mode */ - dma_done (ep, req, tmp, 0); - break; - } else if (!ep->is_in - && (req->req.length % ep->ep.maxpacket) != 0) { - tmp = readl (&ep->regs->ep_stat); - - /* AVOID TROUBLE HERE by not issuing short reads from - * your gadget driver. That helps avoids errata 0121, - * 0122, and 0124; not all cases trigger the warning. - */ - if ((tmp & (1 << NAK_OUT_PACKETS)) == 0) { - WARNING (ep->dev, "%s lost packet sync!\n", - ep->ep.name); - req->req.status = -EOVERFLOW; - } else if ((tmp = readl (&ep->regs->ep_avail)) != 0) { - /* fifo gets flushed later */ - ep->out_overflow = 1; - DEBUG (ep->dev, "%s dma, discard %d len %d\n", - ep->ep.name, tmp, - req->req.length); - req->req.status = -EOVERFLOW; - } - } - dma_done (ep, req, tmp, 0); - } -} - -static void restart_dma (struct net2280_ep *ep) -{ - struct net2280_request *req; - u32 dmactl = dmactl_default; - - if (ep->stopped) - return; - req = list_entry (ep->queue.next, struct net2280_request, queue); - - if (!use_dma_chaining) { - start_dma (ep, req); - return; - } - - /* the 2280 will be processing the queue unless queue hiccups after - * the previous transfer: - * IN: wanted automagic zlp, head doesn't (or vice versa) - * DMA_FIFO_VALIDATE doesn't init from dma descriptors. - * OUT: was "usb-short", we must restart. - */ - if (ep->is_in && !req->valid) { - struct net2280_request *entry, *prev = NULL; - int reqmode, done = 0; - - DEBUG (ep->dev, "%s dma hiccup td %p\n", ep->ep.name, req->td); - ep->in_fifo_validate = likely (req->req.zero - || (req->req.length % ep->ep.maxpacket) != 0); - if (ep->in_fifo_validate) - dmactl |= (1 << DMA_FIFO_VALIDATE); - list_for_each_entry (entry, &ep->queue, queue) { - __le32 dmacount; - - if (entry == req) - continue; - dmacount = entry->td->dmacount; - if (!done) { - reqmode = likely (entry->req.zero - || (entry->req.length - % ep->ep.maxpacket) != 0); - if (reqmode == ep->in_fifo_validate) { - entry->valid = 1; - dmacount |= valid_bit; - entry->td->dmacount = dmacount; - prev = entry; - continue; - } else { - /* force a hiccup */ - prev->td->dmacount |= dma_done_ie; - done = 1; - } - } - - /* walk the rest of the queue so unlinks behave */ - entry->valid = 0; - dmacount &= ~valid_bit; - entry->td->dmacount = dmacount; - prev = entry; - } - } - - writel (0, &ep->dma->dmactl); - start_queue (ep, dmactl, req->td_dma); -} - -static void abort_dma (struct net2280_ep *ep) -{ - /* abort the current transfer */ - if (likely (!list_empty (&ep->queue))) { - /* FIXME work around errata 0121, 0122, 0124 */ - writel ((1 << DMA_ABORT), &ep->dma->dmastat); - spin_stop_dma (ep->dma); - } else - stop_dma (ep->dma); - scan_dma_completions (ep); -} - -/* dequeue ALL requests */ -static void nuke (struct net2280_ep *ep) -{ - struct net2280_request *req; - - /* called with spinlock held */ - ep->stopped = 1; - if (ep->dma) - abort_dma (ep); - while (!list_empty (&ep->queue)) { - req = list_entry (ep->queue.next, - struct net2280_request, - queue); - done (ep, req, -ESHUTDOWN); - } -} - -/* dequeue JUST ONE request */ -static int net2280_dequeue (struct usb_ep *_ep, struct usb_request *_req) -{ - struct net2280_ep *ep; - struct net2280_request *req; - unsigned long flags; - u32 dmactl; - int stopped; - - ep = container_of (_ep, struct net2280_ep, ep); - if (!_ep || (!ep->desc && ep->num != 0) || !_req) - return -EINVAL; - - spin_lock_irqsave (&ep->dev->lock, flags); - stopped = ep->stopped; - - /* quiesce dma while we patch the queue */ - dmactl = 0; - ep->stopped = 1; - if (ep->dma) { - dmactl = readl (&ep->dma->dmactl); - /* WARNING erratum 0127 may kick in ... */ - stop_dma (ep->dma); - scan_dma_completions (ep); - } - - /* make sure it's still queued on this endpoint */ - list_for_each_entry (req, &ep->queue, queue) { - if (&req->req == _req) - break; - } - if (&req->req != _req) { - spin_unlock_irqrestore (&ep->dev->lock, flags); - return -EINVAL; - } - - /* queue head may be partially complete. */ - if (ep->queue.next == &req->queue) { - if (ep->dma) { - DEBUG (ep->dev, "unlink (%s) dma\n", _ep->name); - _req->status = -ECONNRESET; - abort_dma (ep); - if (likely (ep->queue.next == &req->queue)) { - // NOTE: misreports single-transfer mode - req->td->dmacount = 0; /* invalidate */ - dma_done (ep, req, - readl (&ep->dma->dmacount), - -ECONNRESET); - } - } else { - DEBUG (ep->dev, "unlink (%s) pio\n", _ep->name); - done (ep, req, -ECONNRESET); - } - req = NULL; - - /* patch up hardware chaining data */ - } else if (ep->dma && use_dma_chaining) { - if (req->queue.prev == ep->queue.next) { - writel (le32_to_cpu (req->td->dmadesc), - &ep->dma->dmadesc); - if (req->td->dmacount & dma_done_ie) - writel (readl (&ep->dma->dmacount) - | le32_to_cpu(dma_done_ie), - &ep->dma->dmacount); - } else { - struct net2280_request *prev; - - prev = list_entry (req->queue.prev, - struct net2280_request, queue); - prev->td->dmadesc = req->td->dmadesc; - if (req->td->dmacount & dma_done_ie) - prev->td->dmacount |= dma_done_ie; - } - } - - if (req) - done (ep, req, -ECONNRESET); - ep->stopped = stopped; - - if (ep->dma) { - /* turn off dma on inactive queues */ - if (list_empty (&ep->queue)) - stop_dma (ep->dma); - else if (!ep->stopped) { - /* resume current request, or start new one */ - if (req) - writel (dmactl, &ep->dma->dmactl); - else - start_dma (ep, list_entry (ep->queue.next, - struct net2280_request, queue)); - } - } - - spin_unlock_irqrestore (&ep->dev->lock, flags); - return 0; -} - -/*-------------------------------------------------------------------------*/ - -static int net2280_fifo_status (struct usb_ep *_ep); - -static int -net2280_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged) -{ - struct net2280_ep *ep; - unsigned long flags; - int retval = 0; - - ep = container_of (_ep, struct net2280_ep, ep); - if (!_ep || (!ep->desc && ep->num != 0)) - return -EINVAL; - if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) - return -ESHUTDOWN; - if (ep->desc /* not ep0 */ && (ep->desc->bmAttributes & 0x03) - == USB_ENDPOINT_XFER_ISOC) - return -EINVAL; - - spin_lock_irqsave (&ep->dev->lock, flags); - if (!list_empty (&ep->queue)) - retval = -EAGAIN; - else if (ep->is_in && value && net2280_fifo_status (_ep) != 0) - retval = -EAGAIN; - else { - VDEBUG (ep->dev, "%s %s %s\n", _ep->name, - value ? "set" : "clear", - wedged ? "wedge" : "halt"); - /* set/clear, then synch memory views with the device */ - if (value) { - if (ep->num == 0) - ep->dev->protocol_stall = 1; - else - set_halt (ep); - if (wedged) - ep->wedged = 1; - } else { - clear_halt (ep); - ep->wedged = 0; - } - (void) readl (&ep->regs->ep_rsp); - } - spin_unlock_irqrestore (&ep->dev->lock, flags); - - return retval; -} - -static int -net2280_set_halt(struct usb_ep *_ep, int value) -{ - return net2280_set_halt_and_wedge(_ep, value, 0); -} - -static int -net2280_set_wedge(struct usb_ep *_ep) -{ - if (!_ep || _ep->name == ep0name) - return -EINVAL; - return net2280_set_halt_and_wedge(_ep, 1, 1); -} - -static int -net2280_fifo_status (struct usb_ep *_ep) -{ - struct net2280_ep *ep; - u32 avail; - - ep = container_of (_ep, struct net2280_ep, ep); - if (!_ep || (!ep->desc && ep->num != 0)) - return -ENODEV; - if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) - return -ESHUTDOWN; - - avail = readl (&ep->regs->ep_avail) & ((1 << 12) - 1); - if (avail > ep->fifo_size) - return -EOVERFLOW; - if (ep->is_in) - avail = ep->fifo_size - avail; - return avail; -} - -static void -net2280_fifo_flush (struct usb_ep *_ep) -{ - struct net2280_ep *ep; - - ep = container_of (_ep, struct net2280_ep, ep); - if (!_ep || (!ep->desc && ep->num != 0)) - return; - if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) - return; - - writel ((1 << FIFO_FLUSH), &ep->regs->ep_stat); - (void) readl (&ep->regs->ep_rsp); -} - -static const struct usb_ep_ops net2280_ep_ops = { - .enable = net2280_enable, - .disable = net2280_disable, - - .alloc_request = net2280_alloc_request, - .free_request = net2280_free_request, - - .queue = net2280_queue, - .dequeue = net2280_dequeue, - - .set_halt = net2280_set_halt, - .set_wedge = net2280_set_wedge, - .fifo_status = net2280_fifo_status, - .fifo_flush = net2280_fifo_flush, -}; - -/*-------------------------------------------------------------------------*/ - -static int net2280_get_frame (struct usb_gadget *_gadget) -{ - struct net2280 *dev; - unsigned long flags; - u16 retval; - - if (!_gadget) - return -ENODEV; - dev = container_of (_gadget, struct net2280, gadget); - spin_lock_irqsave (&dev->lock, flags); - retval = get_idx_reg (dev->regs, REG_FRAME) & 0x03ff; - spin_unlock_irqrestore (&dev->lock, flags); - return retval; -} - -static int net2280_wakeup (struct usb_gadget *_gadget) -{ - struct net2280 *dev; - u32 tmp; - unsigned long flags; - - if (!_gadget) - return 0; - dev = container_of (_gadget, struct net2280, gadget); - - spin_lock_irqsave (&dev->lock, flags); - tmp = readl (&dev->usb->usbctl); - if (tmp & (1 << DEVICE_REMOTE_WAKEUP_ENABLE)) - writel (1 << GENERATE_RESUME, &dev->usb->usbstat); - spin_unlock_irqrestore (&dev->lock, flags); - - /* pci writes may still be posted */ - return 0; -} - -static int net2280_set_selfpowered (struct usb_gadget *_gadget, int value) -{ - struct net2280 *dev; - u32 tmp; - unsigned long flags; - - if (!_gadget) - return 0; - dev = container_of (_gadget, struct net2280, gadget); - - spin_lock_irqsave (&dev->lock, flags); - tmp = readl (&dev->usb->usbctl); - if (value) - tmp |= (1 << SELF_POWERED_STATUS); - else - tmp &= ~(1 << SELF_POWERED_STATUS); - writel (tmp, &dev->usb->usbctl); - spin_unlock_irqrestore (&dev->lock, flags); - - return 0; -} - -static int net2280_pullup(struct usb_gadget *_gadget, int is_on) -{ - struct net2280 *dev; - u32 tmp; - unsigned long flags; - - if (!_gadget) - return -ENODEV; - dev = container_of (_gadget, struct net2280, gadget); - - spin_lock_irqsave (&dev->lock, flags); - tmp = readl (&dev->usb->usbctl); - dev->softconnect = (is_on != 0); - if (is_on) - tmp |= (1 << USB_DETECT_ENABLE); - else - tmp &= ~(1 << USB_DETECT_ENABLE); - writel (tmp, &dev->usb->usbctl); - spin_unlock_irqrestore (&dev->lock, flags); - - return 0; -} - -static int net2280_start(struct usb_gadget *_gadget, - struct usb_gadget_driver *driver); -static int net2280_stop(struct usb_gadget *_gadget, - struct usb_gadget_driver *driver); - -static const struct usb_gadget_ops net2280_ops = { - .get_frame = net2280_get_frame, - .wakeup = net2280_wakeup, - .set_selfpowered = net2280_set_selfpowered, - .pullup = net2280_pullup, - .udc_start = net2280_start, - .udc_stop = net2280_stop, -}; - -/*-------------------------------------------------------------------------*/ - -#ifdef CONFIG_USB_GADGET_DEBUG_FILES - -/* FIXME move these into procfs, and use seq_file. - * Sysfs _still_ doesn't behave for arbitrarily sized files, - * and also doesn't help products using this with 2.4 kernels. - */ - -/* "function" sysfs attribute */ -static ssize_t function_show(struct device *_dev, struct device_attribute *attr, - char *buf) -{ - struct net2280 *dev = dev_get_drvdata (_dev); - - if (!dev->driver - || !dev->driver->function - || strlen (dev->driver->function) > PAGE_SIZE) - return 0; - return scnprintf (buf, PAGE_SIZE, "%s\n", dev->driver->function); -} -static DEVICE_ATTR_RO(function); - -static ssize_t registers_show(struct device *_dev, - struct device_attribute *attr, char *buf) -{ - struct net2280 *dev; - char *next; - unsigned size, t; - unsigned long flags; - int i; - u32 t1, t2; - const char *s; - - dev = dev_get_drvdata (_dev); - next = buf; - size = PAGE_SIZE; - spin_lock_irqsave (&dev->lock, flags); - - if (dev->driver) - s = dev->driver->driver.name; - else - s = "(none)"; - - /* Main Control Registers */ - t = scnprintf (next, size, "%s version " DRIVER_VERSION - ", chiprev %04x, dma %s\n\n" - "devinit %03x fifoctl %08x gadget '%s'\n" - "pci irqenb0 %02x irqenb1 %08x " - "irqstat0 %04x irqstat1 %08x\n", - driver_name, dev->chiprev, - use_dma - ? (use_dma_chaining ? "chaining" : "enabled") - : "disabled", - readl (&dev->regs->devinit), - readl (&dev->regs->fifoctl), - s, - readl (&dev->regs->pciirqenb0), - readl (&dev->regs->pciirqenb1), - readl (&dev->regs->irqstat0), - readl (&dev->regs->irqstat1)); - size -= t; - next += t; - - /* USB Control Registers */ - t1 = readl (&dev->usb->usbctl); - t2 = readl (&dev->usb->usbstat); - if (t1 & (1 << VBUS_PIN)) { - if (t2 & (1 << HIGH_SPEED)) - s = "high speed"; - else if (dev->gadget.speed == USB_SPEED_UNKNOWN) - s = "powered"; - else - s = "full speed"; - /* full speed bit (6) not working?? */ - } else - s = "not attached"; - t = scnprintf (next, size, - "stdrsp %08x usbctl %08x usbstat %08x " - "addr 0x%02x (%s)\n", - readl (&dev->usb->stdrsp), t1, t2, - readl (&dev->usb->ouraddr), s); - size -= t; - next += t; - - /* PCI Master Control Registers */ - - /* DMA Control Registers */ - - /* Configurable EP Control Registers */ - for (i = 0; i < 7; i++) { - struct net2280_ep *ep; - - ep = &dev->ep [i]; - if (i && !ep->desc) - continue; - - t1 = readl (&ep->regs->ep_cfg); - t2 = readl (&ep->regs->ep_rsp) & 0xff; - t = scnprintf (next, size, - "\n%s\tcfg %05x rsp (%02x) %s%s%s%s%s%s%s%s" - "irqenb %02x\n", - ep->ep.name, t1, t2, - (t2 & (1 << CLEAR_NAK_OUT_PACKETS)) - ? "NAK " : "", - (t2 & (1 << CLEAR_EP_HIDE_STATUS_PHASE)) - ? "hide " : "", - (t2 & (1 << CLEAR_EP_FORCE_CRC_ERROR)) - ? "CRC " : "", - (t2 & (1 << CLEAR_INTERRUPT_MODE)) - ? "interrupt " : "", - (t2 & (1<<CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE)) - ? "status " : "", - (t2 & (1 << CLEAR_NAK_OUT_PACKETS_MODE)) - ? "NAKmode " : "", - (t2 & (1 << CLEAR_ENDPOINT_TOGGLE)) - ? "DATA1 " : "DATA0 ", - (t2 & (1 << CLEAR_ENDPOINT_HALT)) - ? "HALT " : "", - readl (&ep->regs->ep_irqenb)); - size -= t; - next += t; - - t = scnprintf (next, size, - "\tstat %08x avail %04x " - "(ep%d%s-%s)%s\n", - readl (&ep->regs->ep_stat), - readl (&ep->regs->ep_avail), - t1 & 0x0f, DIR_STRING (t1), - type_string (t1 >> 8), - ep->stopped ? "*" : ""); - size -= t; - next += t; - - if (!ep->dma) - continue; - - t = scnprintf (next, size, - " dma\tctl %08x stat %08x count %08x\n" - "\taddr %08x desc %08x\n", - readl (&ep->dma->dmactl), - readl (&ep->dma->dmastat), - readl (&ep->dma->dmacount), - readl (&ep->dma->dmaaddr), - readl (&ep->dma->dmadesc)); - size -= t; - next += t; - - } - - /* Indexed Registers */ - // none yet - - /* Statistics */ - t = scnprintf (next, size, "\nirqs: "); - size -= t; - next += t; - for (i = 0; i < 7; i++) { - struct net2280_ep *ep; - - ep = &dev->ep [i]; - if (i && !ep->irqs) - continue; - t = scnprintf (next, size, " %s/%lu", ep->ep.name, ep->irqs); - size -= t; - next += t; - - } - t = scnprintf (next, size, "\n"); - size -= t; - next += t; - - spin_unlock_irqrestore (&dev->lock, flags); - - return PAGE_SIZE - size; -} -static DEVICE_ATTR_RO(registers); - -static ssize_t queues_show(struct device *_dev, struct device_attribute *attr, - char *buf) -{ - struct net2280 *dev; - char *next; - unsigned size; - unsigned long flags; - int i; - - dev = dev_get_drvdata (_dev); - next = buf; - size = PAGE_SIZE; - spin_lock_irqsave (&dev->lock, flags); - - for (i = 0; i < 7; i++) { - struct net2280_ep *ep = &dev->ep [i]; - struct net2280_request *req; - int t; - - if (i != 0) { - const struct usb_endpoint_descriptor *d; - - d = ep->desc; - if (!d) - continue; - t = d->bEndpointAddress; - t = scnprintf (next, size, - "\n%s (ep%d%s-%s) max %04x %s fifo %d\n", - ep->ep.name, t & USB_ENDPOINT_NUMBER_MASK, - (t & USB_DIR_IN) ? "in" : "out", - ({ char *val; - switch (d->bmAttributes & 0x03) { - case USB_ENDPOINT_XFER_BULK: - val = "bulk"; break; - case USB_ENDPOINT_XFER_INT: - val = "intr"; break; - default: - val = "iso"; break; - } val; }), - usb_endpoint_maxp (d) & 0x1fff, - ep->dma ? "dma" : "pio", ep->fifo_size - ); - } else /* ep0 should only have one transfer queued */ - t = scnprintf (next, size, "ep0 max 64 pio %s\n", - ep->is_in ? "in" : "out"); - 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->td_dma == readl (&ep->dma->dmadesc)) - t = scnprintf (next, size, - "\treq %p len %d/%d " - "buf %p (dmacount %08x)\n", - &req->req, req->req.actual, - req->req.length, req->req.buf, - readl (&ep->dma->dmacount)); - else - t = scnprintf (next, size, - "\treq %p len %d/%d buf %p\n", - &req->req, req->req.actual, - req->req.length, req->req.buf); - if (t <= 0 || t > size) - goto done; - size -= t; - next += t; - - if (ep->dma) { - struct net2280_dma *td; - - td = req->td; - t = scnprintf (next, size, "\t td %08x " - " count %08x buf %08x desc %08x\n", - (u32) req->td_dma, - le32_to_cpu (td->dmacount), - le32_to_cpu (td->dmaaddr), - le32_to_cpu (td->dmadesc)); - if (t <= 0 || t > size) - goto done; - size -= t; - next += t; - } - } - } - -done: - spin_unlock_irqrestore (&dev->lock, flags); - return PAGE_SIZE - size; -} -static DEVICE_ATTR_RO(queues); - - -#else - -#define device_create_file(a,b) (0) -#define device_remove_file(a,b) do { } while (0) - -#endif - -/*-------------------------------------------------------------------------*/ - -/* another driver-specific mode might be a request type doing dma - * to/from another device fifo instead of to/from memory. - */ - -static void set_fifo_mode (struct net2280 *dev, int mode) -{ - /* keeping high bits preserves BAR2 */ - writel ((0xffff << PCI_BASE2_RANGE) | mode, &dev->regs->fifoctl); - - /* always ep-{a,b,e,f} ... maybe not ep-c or ep-d */ - INIT_LIST_HEAD (&dev->gadget.ep_list); - list_add_tail (&dev->ep [1].ep.ep_list, &dev->gadget.ep_list); - list_add_tail (&dev->ep [2].ep.ep_list, &dev->gadget.ep_list); - switch (mode) { - case 0: - list_add_tail (&dev->ep [3].ep.ep_list, &dev->gadget.ep_list); - list_add_tail (&dev->ep [4].ep.ep_list, &dev->gadget.ep_list); - dev->ep [1].fifo_size = dev->ep [2].fifo_size = 1024; - break; - case 1: - dev->ep [1].fifo_size = dev->ep [2].fifo_size = 2048; - break; - case 2: - list_add_tail (&dev->ep [3].ep.ep_list, &dev->gadget.ep_list); - dev->ep [1].fifo_size = 2048; - dev->ep [2].fifo_size = 1024; - break; - } - /* fifo sizes for ep0, ep-c, ep-d, ep-e, and ep-f never change */ - list_add_tail (&dev->ep [5].ep.ep_list, &dev->gadget.ep_list); - list_add_tail (&dev->ep [6].ep.ep_list, &dev->gadget.ep_list); -} - -/* keeping it simple: - * - one bus driver, initted first; - * - one function driver, initted second - * - * most of the work to support multiple net2280 controllers would - * be to associate this gadget driver (yes?) with all of them, or - * perhaps to bind specific drivers to specific devices. - */ - -static void usb_reset (struct net2280 *dev) -{ - u32 tmp; - - dev->gadget.speed = USB_SPEED_UNKNOWN; - (void) readl (&dev->usb->usbctl); - - net2280_led_init (dev); - - /* disable automatic responses, and irqs */ - writel (0, &dev->usb->stdrsp); - writel (0, &dev->regs->pciirqenb0); - writel (0, &dev->regs->pciirqenb1); - - /* clear old dma and irq state */ - for (tmp = 0; tmp < 4; tmp++) { - struct net2280_ep *ep = &dev->ep [tmp + 1]; - - if (ep->dma) - abort_dma (ep); - } - writel (~0, &dev->regs->irqstat0), - writel (~(1 << SUSPEND_REQUEST_INTERRUPT), &dev->regs->irqstat1), - - /* reset, and enable pci */ - tmp = readl (&dev->regs->devinit) - | (1 << PCI_ENABLE) - | (1 << FIFO_SOFT_RESET) - | (1 << USB_SOFT_RESET) - | (1 << M8051_RESET); - writel (tmp, &dev->regs->devinit); - - /* standard fifo and endpoint allocations */ - set_fifo_mode (dev, (fifo_mode <= 2) ? fifo_mode : 0); -} - -static void usb_reinit (struct net2280 *dev) -{ - u32 tmp; - int init_dma; - - /* use_dma changes are ignored till next device re-init */ - init_dma = use_dma; - - /* basic endpoint init */ - for (tmp = 0; tmp < 7; tmp++) { - struct net2280_ep *ep = &dev->ep [tmp]; - - ep->ep.name = ep_name [tmp]; - ep->dev = dev; - ep->num = tmp; - - if (tmp > 0 && tmp <= 4) { - ep->fifo_size = 1024; - if (init_dma) - ep->dma = &dev->dma [tmp - 1]; - } else - ep->fifo_size = 64; - ep->regs = &dev->epregs [tmp]; - ep_reset (dev->regs, ep); - } - usb_ep_set_maxpacket_limit(&dev->ep [0].ep, 64); - usb_ep_set_maxpacket_limit(&dev->ep [5].ep, 64); - usb_ep_set_maxpacket_limit(&dev->ep [6].ep, 64); - - dev->gadget.ep0 = &dev->ep [0].ep; - dev->ep [0].stopped = 0; - INIT_LIST_HEAD (&dev->gadget.ep0->ep_list); - - /* we want to prevent lowlevel/insecure access from the USB host, - * but erratum 0119 means this enable bit is ignored - */ - for (tmp = 0; tmp < 5; tmp++) - writel (EP_DONTUSE, &dev->dep [tmp].dep_cfg); -} - -static void ep0_start (struct net2280 *dev) -{ - writel ( (1 << CLEAR_EP_HIDE_STATUS_PHASE) - | (1 << CLEAR_NAK_OUT_PACKETS) - | (1 << CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE) - , &dev->epregs [0].ep_rsp); - - /* - * hardware optionally handles a bunch of standard requests - * that the API hides from drivers anyway. have it do so. - * endpoint status/features are handled in software, to - * help pass tests for some dubious behavior. - */ - writel ( (1 << SET_TEST_MODE) - | (1 << SET_ADDRESS) - | (1 << DEVICE_SET_CLEAR_DEVICE_REMOTE_WAKEUP) - | (1 << GET_DEVICE_STATUS) - | (1 << GET_INTERFACE_STATUS) - , &dev->usb->stdrsp); - writel ( (1 << USB_ROOT_PORT_WAKEUP_ENABLE) - | (1 << SELF_POWERED_USB_DEVICE) - | (1 << REMOTE_WAKEUP_SUPPORT) - | (dev->softconnect << USB_DETECT_ENABLE) - | (1 << SELF_POWERED_STATUS) - , &dev->usb->usbctl); - - /* enable irqs so we can see ep0 and general operation */ - writel ( (1 << SETUP_PACKET_INTERRUPT_ENABLE) - | (1 << ENDPOINT_0_INTERRUPT_ENABLE) - , &dev->regs->pciirqenb0); - writel ( (1 << PCI_INTERRUPT_ENABLE) - | (1 << PCI_MASTER_ABORT_RECEIVED_INTERRUPT_ENABLE) - | (1 << PCI_TARGET_ABORT_RECEIVED_INTERRUPT_ENABLE) - | (1 << PCI_RETRY_ABORT_INTERRUPT_ENABLE) - | (1 << VBUS_INTERRUPT_ENABLE) - | (1 << ROOT_PORT_RESET_INTERRUPT_ENABLE) - | (1 << SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE) - , &dev->regs->pciirqenb1); - - /* don't leave any writes posted */ - (void) readl (&dev->usb->usbctl); -} - -/* when a driver is successfully registered, it will receive - * control requests including set_configuration(), which enables - * non-control requests. then usb traffic follows until a - * disconnect is reported. then a host may connect again, or - * the driver might get unbound. - */ -static int net2280_start(struct usb_gadget *_gadget, - struct usb_gadget_driver *driver) -{ - struct net2280 *dev; - int retval; - unsigned i; - - /* insist on high speed support from the driver, since - * (dev->usb->xcvrdiag & FORCE_FULL_SPEED_MODE) - * "must not be used in normal operation" - */ - if (!driver || driver->max_speed < USB_SPEED_HIGH - || !driver->setup) - return -EINVAL; - - dev = container_of (_gadget, struct net2280, gadget); - - for (i = 0; i < 7; i++) - dev->ep [i].irqs = 0; - - /* hook up the driver ... */ - dev->softconnect = 1; - driver->driver.bus = NULL; - dev->driver = driver; - - retval = device_create_file (&dev->pdev->dev, &dev_attr_function); - if (retval) goto err_unbind; - retval = device_create_file (&dev->pdev->dev, &dev_attr_queues); - if (retval) goto err_func; - - /* Enable force-full-speed testing mode, if desired */ - if (full_speed) - writel(1 << FORCE_FULL_SPEED_MODE, &dev->usb->xcvrdiag); - - /* ... then enable host detection and ep0; and we're ready - * for set_configuration as well as eventual disconnect. - */ - net2280_led_active (dev, 1); - ep0_start (dev); - - DEBUG (dev, "%s ready, usbctl %08x stdrsp %08x\n", - driver->driver.name, - readl (&dev->usb->usbctl), - readl (&dev->usb->stdrsp)); - - /* pci writes may still be posted */ - return 0; - -err_func: - device_remove_file (&dev->pdev->dev, &dev_attr_function); -err_unbind: - dev->driver = NULL; - return retval; -} - -static void -stop_activity (struct net2280 *dev, struct usb_gadget_driver *driver) -{ - int i; - - /* don't disconnect if it's not connected */ - if (dev->gadget.speed == USB_SPEED_UNKNOWN) - driver = NULL; - - /* stop hardware; prevent new request submissions; - * and kill any outstanding requests. - */ - usb_reset (dev); - for (i = 0; i < 7; i++) - nuke (&dev->ep [i]); - - /* report disconnect; the driver is already quiesced */ - if (driver) { - spin_unlock(&dev->lock); - driver->disconnect(&dev->gadget); - spin_lock(&dev->lock); - } - - usb_reinit (dev); -} - -static int net2280_stop(struct usb_gadget *_gadget, - struct usb_gadget_driver *driver) -{ - struct net2280 *dev; - unsigned long flags; - - dev = container_of (_gadget, struct net2280, gadget); - - spin_lock_irqsave (&dev->lock, flags); - stop_activity (dev, driver); - spin_unlock_irqrestore (&dev->lock, flags); - - dev->driver = NULL; - - net2280_led_active (dev, 0); - - /* Disable full-speed test mode */ - writel(0, &dev->usb->xcvrdiag); - - device_remove_file (&dev->pdev->dev, &dev_attr_function); - device_remove_file (&dev->pdev->dev, &dev_attr_queues); - - DEBUG(dev, "unregistered driver '%s'\n", - driver ? driver->driver.name : ""); - - return 0; -} - -/*-------------------------------------------------------------------------*/ - -/* handle ep0, ep-e, ep-f with 64 byte packets: packet per irq. - * also works for dma-capable endpoints, in pio mode or just - * to manually advance the queue after short OUT transfers. - */ -static void handle_ep_small (struct net2280_ep *ep) -{ - struct net2280_request *req; - u32 t; - /* 0 error, 1 mid-data, 2 done */ - int mode = 1; - - if (!list_empty (&ep->queue)) - req = list_entry (ep->queue.next, - struct net2280_request, queue); - else - req = NULL; - - /* ack all, and handle what we care about */ - t = readl (&ep->regs->ep_stat); - ep->irqs++; -#if 0 - VDEBUG (ep->dev, "%s ack ep_stat %08x, req %p\n", - ep->ep.name, t, req ? &req->req : 0); -#endif - if (!ep->is_in || ep->dev->pdev->device == 0x2280) - writel (t & ~(1 << NAK_OUT_PACKETS), &ep->regs->ep_stat); - else - /* Added for 2282 */ - writel (t, &ep->regs->ep_stat); - - /* for ep0, monitor token irqs to catch data stage length errors - * and to synchronize on status. - * - * also, to defer reporting of protocol stalls ... here's where - * data or status first appears, handling stalls here should never - * cause trouble on the host side.. - * - * control requests could be slightly faster without token synch for - * status, but status can jam up that way. - */ - if (unlikely (ep->num == 0)) { - if (ep->is_in) { - /* status; stop NAKing */ - if (t & (1 << DATA_OUT_PING_TOKEN_INTERRUPT)) { - if (ep->dev->protocol_stall) { - ep->stopped = 1; - set_halt (ep); - } - if (!req) - allow_status (ep); - mode = 2; - /* reply to extra IN data tokens with a zlp */ - } else if (t & (1 << DATA_IN_TOKEN_INTERRUPT)) { - if (ep->dev->protocol_stall) { - ep->stopped = 1; - set_halt (ep); - mode = 2; - } else if (ep->responded && - !req && !ep->stopped) - write_fifo (ep, NULL); - } - } else { - /* status; stop NAKing */ - if (t & (1 << DATA_IN_TOKEN_INTERRUPT)) { - if (ep->dev->protocol_stall) { - ep->stopped = 1; - set_halt (ep); - } - mode = 2; - /* an extra OUT token is an error */ - } else if (((t & (1 << DATA_OUT_PING_TOKEN_INTERRUPT)) - && req - && req->req.actual == req->req.length) - || (ep->responded && !req)) { - ep->dev->protocol_stall = 1; - set_halt (ep); - ep->stopped = 1; - if (req) - done (ep, req, -EOVERFLOW); - req = NULL; - } - } - } - - if (unlikely (!req)) - return; - - /* manual DMA queue advance after short OUT */ - if (likely (ep->dma)) { - if (t & (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT)) { - u32 count; - int stopped = ep->stopped; - - /* TRANSFERRED works around OUT_DONE erratum 0112. - * we expect (N <= maxpacket) bytes; host wrote M. - * iff (M < N) we won't ever see a DMA interrupt. - */ - ep->stopped = 1; - for (count = 0; ; t = readl (&ep->regs->ep_stat)) { - - /* any preceding dma transfers must finish. - * dma handles (M >= N), may empty the queue - */ - scan_dma_completions (ep); - if (unlikely (list_empty (&ep->queue) - || ep->out_overflow)) { - req = NULL; - break; - } - req = list_entry (ep->queue.next, - struct net2280_request, queue); - - /* here either (M < N), a "real" short rx; - * or (M == N) and the queue didn't empty - */ - if (likely (t & (1 << FIFO_EMPTY))) { - count = readl (&ep->dma->dmacount); - count &= DMA_BYTE_COUNT_MASK; - if (readl (&ep->dma->dmadesc) - != req->td_dma) - req = NULL; - break; - } - udelay(1); - } - - /* stop DMA, leave ep NAKing */ - writel ((1 << DMA_ABORT), &ep->dma->dmastat); - spin_stop_dma (ep->dma); - - if (likely (req)) { - req->td->dmacount = 0; - t = readl (&ep->regs->ep_avail); - dma_done (ep, req, count, - (ep->out_overflow || t) - ? -EOVERFLOW : 0); - } - - /* also flush to prevent erratum 0106 trouble */ - if (unlikely (ep->out_overflow - || (ep->dev->chiprev == 0x0100 - && ep->dev->gadget.speed - == USB_SPEED_FULL))) { - out_flush (ep); - ep->out_overflow = 0; - } - - /* (re)start dma if needed, stop NAKing */ - ep->stopped = stopped; - if (!list_empty (&ep->queue)) - restart_dma (ep); - } else - DEBUG (ep->dev, "%s dma ep_stat %08x ??\n", - ep->ep.name, t); - return; - - /* data packet(s) received (in the fifo, OUT) */ - } else if (t & (1 << DATA_PACKET_RECEIVED_INTERRUPT)) { - if (read_fifo (ep, req) && ep->num != 0) - mode = 2; - - /* data packet(s) transmitted (IN) */ - } else if (t & (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)) { - unsigned len; - - len = req->req.length - req->req.actual; - if (len > ep->ep.maxpacket) - len = ep->ep.maxpacket; - req->req.actual += len; - - /* if we wrote it all, we're usually done */ - if (req->req.actual == req->req.length) { - if (ep->num == 0) { - /* send zlps until the status stage */ - } else if (!req->req.zero || len != ep->ep.maxpacket) - mode = 2; - } - - /* there was nothing to do ... */ - } else if (mode == 1) - return; - - /* done */ - if (mode == 2) { - /* stream endpoints often resubmit/unlink in completion */ - done (ep, req, 0); - - /* maybe advance queue to next request */ - if (ep->num == 0) { - /* NOTE: net2280 could let gadget driver start the - * status stage later. since not all controllers let - * them control that, the api doesn't (yet) allow it. - */ - if (!ep->stopped) - allow_status (ep); - req = NULL; - } else { - if (!list_empty (&ep->queue) && !ep->stopped) - req = list_entry (ep->queue.next, - struct net2280_request, queue); - else - req = NULL; - if (req && !ep->is_in) - stop_out_naking (ep); - } - } - - /* is there a buffer for the next packet? - * for best streaming performance, make sure there is one. - */ - if (req && !ep->stopped) { - - /* load IN fifo with next packet (may be zlp) */ - if (t & (1 << DATA_PACKET_TRANSMITTED_INTERRUPT)) - write_fifo (ep, &req->req); - } -} - -static struct net2280_ep * -get_ep_by_addr (struct net2280 *dev, u16 wIndex) -{ - struct net2280_ep *ep; - - if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0) - return &dev->ep [0]; - list_for_each_entry (ep, &dev->gadget.ep_list, ep.ep_list) { - u8 bEndpointAddress; - - if (!ep->desc) - continue; - bEndpointAddress = ep->desc->bEndpointAddress; - if ((wIndex ^ bEndpointAddress) & USB_DIR_IN) - continue; - if ((wIndex & 0x0f) == (bEndpointAddress & 0x0f)) - return ep; - } - return NULL; -} - -static void handle_stat0_irqs (struct net2280 *dev, u32 stat) -{ - struct net2280_ep *ep; - u32 num, scratch; - - /* most of these don't need individual acks */ - stat &= ~(1 << INTA_ASSERTED); - if (!stat) - return; - // DEBUG (dev, "irqstat0 %04x\n", stat); - - /* starting a control request? */ - if (unlikely (stat & (1 << SETUP_PACKET_INTERRUPT))) { - union { - u32 raw [2]; - struct usb_ctrlrequest r; - } u; - int tmp; - struct net2280_request *req; - - if (dev->gadget.speed == USB_SPEED_UNKNOWN) { - if (readl (&dev->usb->usbstat) & (1 << HIGH_SPEED)) - dev->gadget.speed = USB_SPEED_HIGH; - else - dev->gadget.speed = USB_SPEED_FULL; - net2280_led_speed (dev, dev->gadget.speed); - DEBUG(dev, "%s\n", usb_speed_string(dev->gadget.speed)); - } - - ep = &dev->ep [0]; - ep->irqs++; - - /* make sure any leftover request state is cleared */ - stat &= ~(1 << ENDPOINT_0_INTERRUPT); - while (!list_empty (&ep->queue)) { - req = list_entry (ep->queue.next, - struct net2280_request, queue); - done (ep, req, (req->req.actual == req->req.length) - ? 0 : -EPROTO); - } - ep->stopped = 0; - dev->protocol_stall = 0; - - if (ep->dev->pdev->device == 0x2280) - tmp = (1 << FIFO_OVERFLOW) - | (1 << FIFO_UNDERFLOW); - else - tmp = 0; - - writel (tmp | (1 << TIMEOUT) - | (1 << USB_STALL_SENT) - | (1 << USB_IN_NAK_SENT) - | (1 << USB_IN_ACK_RCVD) - | (1 << USB_OUT_PING_NAK_SENT) - | (1 << USB_OUT_ACK_SENT) - | (1 << SHORT_PACKET_OUT_DONE_INTERRUPT) - | (1 << SHORT_PACKET_TRANSFERRED_INTERRUPT) - | (1 << DATA_PACKET_RECEIVED_INTERRUPT) - | (1 << DATA_PACKET_TRANSMITTED_INTERRUPT) - | (1 << DATA_OUT_PING_TOKEN_INTERRUPT) - | (1 << DATA_IN_TOKEN_INTERRUPT) - , &ep->regs->ep_stat); - u.raw [0] = readl (&dev->usb->setup0123); - u.raw [1] = readl (&dev->usb->setup4567); - - cpu_to_le32s (&u.raw [0]); - cpu_to_le32s (&u.raw [1]); - - tmp = 0; - -#define w_value le16_to_cpu(u.r.wValue) -#define w_index le16_to_cpu(u.r.wIndex) -#define w_length le16_to_cpu(u.r.wLength) - - /* ack the irq */ - writel (1 << SETUP_PACKET_INTERRUPT, &dev->regs->irqstat0); - stat ^= (1 << SETUP_PACKET_INTERRUPT); - - /* watch control traffic at the token level, and force - * synchronization before letting the status stage happen. - * FIXME ignore tokens we'll NAK, until driver responds. - * that'll mean a lot less irqs for some drivers. - */ - ep->is_in = (u.r.bRequestType & USB_DIR_IN) != 0; - if (ep->is_in) { - scratch = (1 << DATA_PACKET_TRANSMITTED_INTERRUPT) - | (1 << DATA_OUT_PING_TOKEN_INTERRUPT) - | (1 << DATA_IN_TOKEN_INTERRUPT); - stop_out_naking (ep); - } else - scratch = (1 << DATA_PACKET_RECEIVED_INTERRUPT) - | (1 << DATA_OUT_PING_TOKEN_INTERRUPT) - | (1 << DATA_IN_TOKEN_INTERRUPT); - writel (scratch, &dev->epregs [0].ep_irqenb); - - /* we made the hardware handle most lowlevel requests; - * everything else goes uplevel to the gadget code. - */ - ep->responded = 1; - switch (u.r.bRequest) { - case USB_REQ_GET_STATUS: { - struct net2280_ep *e; - __le32 status; - - /* hw handles device and interface status */ - if (u.r.bRequestType != (USB_DIR_IN|USB_RECIP_ENDPOINT)) - goto delegate; - if ((e = get_ep_by_addr (dev, w_index)) == NULL - || w_length > 2) - goto do_stall; - - if (readl (&e->regs->ep_rsp) - & (1 << SET_ENDPOINT_HALT)) - status = cpu_to_le32 (1); - else - status = cpu_to_le32 (0); - - /* don't bother with a request object! */ - writel (0, &dev->epregs [0].ep_irqenb); - set_fifo_bytecount (ep, w_length); - writel ((__force u32)status, &dev->epregs [0].ep_data); - allow_status (ep); - VDEBUG (dev, "%s stat %02x\n", ep->ep.name, status); - goto next_endpoints; - } - break; - case USB_REQ_CLEAR_FEATURE: { - struct net2280_ep *e; - - /* hw handles device features */ - if (u.r.bRequestType != USB_RECIP_ENDPOINT) - goto delegate; - if (w_value != USB_ENDPOINT_HALT - || w_length != 0) - goto do_stall; - if ((e = get_ep_by_addr (dev, w_index)) == NULL) - goto do_stall; - if (e->wedged) { - VDEBUG(dev, "%s wedged, halt not cleared\n", - ep->ep.name); - } else { - VDEBUG(dev, "%s clear halt\n", ep->ep.name); - clear_halt(e); - } - allow_status (ep); - goto next_endpoints; - } - break; - case USB_REQ_SET_FEATURE: { - struct net2280_ep *e; - - /* hw handles device features */ - if (u.r.bRequestType != USB_RECIP_ENDPOINT) - goto delegate; - if (w_value != USB_ENDPOINT_HALT - || w_length != 0) - goto do_stall; - if ((e = get_ep_by_addr (dev, w_index)) == NULL) - goto do_stall; - if (e->ep.name == ep0name) - goto do_stall; - set_halt (e); - allow_status (ep); - VDEBUG (dev, "%s set halt\n", ep->ep.name); - goto next_endpoints; - } - break; - default: -delegate: - VDEBUG (dev, "setup %02x.%02x v%04x i%04x l%04x " - "ep_cfg %08x\n", - u.r.bRequestType, u.r.bRequest, - w_value, w_index, w_length, - readl (&ep->regs->ep_cfg)); - ep->responded = 0; - spin_unlock (&dev->lock); - tmp = dev->driver->setup (&dev->gadget, &u.r); - spin_lock (&dev->lock); - } - - /* stall ep0 on error */ - if (tmp < 0) { -do_stall: - VDEBUG (dev, "req %02x.%02x protocol STALL; stat %d\n", - u.r.bRequestType, u.r.bRequest, tmp); - dev->protocol_stall = 1; - } - - /* some in/out token irq should follow; maybe stall then. - * driver must queue a request (even zlp) or halt ep0 - * before the host times out. - */ - } - -#undef w_value -#undef w_index -#undef w_length - -next_endpoints: - /* endpoint data irq ? */ - scratch = stat & 0x7f; - stat &= ~0x7f; - for (num = 0; scratch; num++) { - u32 t; - - /* do this endpoint's FIFO and queue need tending? */ - t = 1 << num; - if ((scratch & t) == 0) - continue; - scratch ^= t; - - ep = &dev->ep [num]; - handle_ep_small (ep); - } - - if (stat) - DEBUG (dev, "unhandled irqstat0 %08x\n", stat); -} - -#define DMA_INTERRUPTS ( \ - (1 << DMA_D_INTERRUPT) \ - | (1 << DMA_C_INTERRUPT) \ - | (1 << DMA_B_INTERRUPT) \ - | (1 << DMA_A_INTERRUPT)) -#define PCI_ERROR_INTERRUPTS ( \ - (1 << PCI_MASTER_ABORT_RECEIVED_INTERRUPT) \ - | (1 << PCI_TARGET_ABORT_RECEIVED_INTERRUPT) \ - | (1 << PCI_RETRY_ABORT_INTERRUPT)) - -static void handle_stat1_irqs (struct net2280 *dev, u32 stat) -{ - struct net2280_ep *ep; - u32 tmp, num, mask, scratch; - - /* after disconnect there's nothing else to do! */ - tmp = (1 << VBUS_INTERRUPT) | (1 << ROOT_PORT_RESET_INTERRUPT); - mask = (1 << HIGH_SPEED) | (1 << FULL_SPEED); - - /* VBUS disconnect is indicated by VBUS_PIN and VBUS_INTERRUPT set. - * Root Port Reset is indicated by ROOT_PORT_RESET_INTERRUPT set and - * both HIGH_SPEED and FULL_SPEED clear (as ROOT_PORT_RESET_INTERRUPT - * only indicates a change in the reset state). - */ - if (stat & tmp) { - writel (tmp, &dev->regs->irqstat1); - if ((((stat & (1 << ROOT_PORT_RESET_INTERRUPT)) - && ((readl (&dev->usb->usbstat) & mask) - == 0)) - || ((readl (&dev->usb->usbctl) - & (1 << VBUS_PIN)) == 0) - ) && ( dev->gadget.speed != USB_SPEED_UNKNOWN)) { - DEBUG (dev, "disconnect %s\n", - dev->driver->driver.name); - stop_activity (dev, dev->driver); - ep0_start (dev); - return; - } - stat &= ~tmp; - - /* vBUS can bounce ... one of many reasons to ignore the - * notion of hotplug events on bus connect/disconnect! - */ - if (!stat) - return; - } - - /* NOTE: chip stays in PCI D0 state for now, but it could - * enter D1 to save more power - */ - tmp = (1 << SUSPEND_REQUEST_CHANGE_INTERRUPT); - if (stat & tmp) { - writel (tmp, &dev->regs->irqstat1); - if (stat & (1 << SUSPEND_REQUEST_INTERRUPT)) { - if (dev->driver->suspend) - dev->driver->suspend (&dev->gadget); - if (!enable_suspend) - stat &= ~(1 << SUSPEND_REQUEST_INTERRUPT); - } else { - if (dev->driver->resume) - dev->driver->resume (&dev->gadget); - /* at high speed, note erratum 0133 */ - } - stat &= ~tmp; - } - - /* clear any other status/irqs */ - if (stat) - writel (stat, &dev->regs->irqstat1); - - /* some status we can just ignore */ - if (dev->pdev->device == 0x2280) - stat &= ~((1 << CONTROL_STATUS_INTERRUPT) - | (1 << SUSPEND_REQUEST_INTERRUPT) - | (1 << RESUME_INTERRUPT) - | (1 << SOF_INTERRUPT)); - else - stat &= ~((1 << CONTROL_STATUS_INTERRUPT) - | (1 << RESUME_INTERRUPT) - | (1 << SOF_DOWN_INTERRUPT) - | (1 << SOF_INTERRUPT)); - - if (!stat) - return; - // DEBUG (dev, "irqstat1 %08x\n", stat); - - /* DMA status, for ep-{a,b,c,d} */ - scratch = stat & DMA_INTERRUPTS; - stat &= ~DMA_INTERRUPTS; - scratch >>= 9; - for (num = 0; scratch; num++) { - struct net2280_dma_regs __iomem *dma; - - tmp = 1 << num; - if ((tmp & scratch) == 0) - continue; - scratch ^= tmp; - - ep = &dev->ep [num + 1]; - dma = ep->dma; - - if (!dma) - continue; - - /* clear ep's dma status */ - tmp = readl (&dma->dmastat); - writel (tmp, &dma->dmastat); - - /* chaining should stop on abort, short OUT from fifo, - * or (stat0 codepath) short OUT transfer. - */ - if (!use_dma_chaining) { - if ((tmp & (1 << DMA_TRANSACTION_DONE_INTERRUPT)) - == 0) { - DEBUG (ep->dev, "%s no xact done? %08x\n", - ep->ep.name, tmp); - continue; - } - stop_dma (ep->dma); - } - - /* OUT transfers terminate when the data from the - * host is in our memory. Process whatever's done. - * On this path, we know transfer's last packet wasn't - * less than req->length. NAK_OUT_PACKETS may be set, - * or the FIFO may already be holding new packets. - * - * IN transfers can linger in the FIFO for a very - * long time ... we ignore that for now, accounting - * precisely (like PIO does) needs per-packet irqs - */ - scan_dma_completions (ep); - - /* disable dma on inactive queues; else maybe restart */ - if (list_empty (&ep->queue)) { - if (use_dma_chaining) - stop_dma (ep->dma); - } else { - tmp = readl (&dma->dmactl); - if (!use_dma_chaining - || (tmp & (1 << DMA_ENABLE)) == 0) - restart_dma (ep); - else if (ep->is_in && use_dma_chaining) { - struct net2280_request *req; - __le32 dmacount; - - /* the descriptor at the head of the chain - * may still have VALID_BIT clear; that's - * used to trigger changing DMA_FIFO_VALIDATE - * (affects automagic zlp writes). - */ - req = list_entry (ep->queue.next, - struct net2280_request, queue); - dmacount = req->td->dmacount; - dmacount &= cpu_to_le32 ( - (1 << VALID_BIT) - | DMA_BYTE_COUNT_MASK); - if (dmacount && (dmacount & valid_bit) == 0) - restart_dma (ep); - } - } - ep->irqs++; - } - - /* NOTE: there are other PCI errors we might usefully notice. - * if they appear very often, here's where to try recovering. - */ - if (stat & PCI_ERROR_INTERRUPTS) { - ERROR (dev, "pci dma error; stat %08x\n", stat); - stat &= ~PCI_ERROR_INTERRUPTS; - /* these are fatal errors, but "maybe" they won't - * happen again ... - */ - stop_activity (dev, dev->driver); - ep0_start (dev); - stat = 0; - } - - if (stat) - DEBUG (dev, "unhandled irqstat1 %08x\n", stat); -} - -static irqreturn_t net2280_irq (int irq, void *_dev) -{ - struct net2280 *dev = _dev; - - /* shared interrupt, not ours */ - if (!(readl(&dev->regs->irqstat0) & (1 << INTA_ASSERTED))) - return IRQ_NONE; - - spin_lock (&dev->lock); - - /* handle disconnect, dma, and more */ - handle_stat1_irqs (dev, readl (&dev->regs->irqstat1)); - - /* control requests and PIO */ - handle_stat0_irqs (dev, readl (&dev->regs->irqstat0)); - - spin_unlock (&dev->lock); - - return IRQ_HANDLED; -} - -/*-------------------------------------------------------------------------*/ - -static void gadget_release (struct device *_dev) -{ - struct net2280 *dev = dev_get_drvdata (_dev); - - kfree (dev); -} - -/* tear down the binding between this driver and the pci device */ - -static void net2280_remove (struct pci_dev *pdev) -{ - struct net2280 *dev = pci_get_drvdata (pdev); - - usb_del_gadget_udc(&dev->gadget); - - BUG_ON(dev->driver); - - /* then clean up the resources we allocated during probe() */ - net2280_led_shutdown (dev); - if (dev->requests) { - int i; - for (i = 1; i < 5; i++) { - if (!dev->ep [i].dummy) - continue; - pci_pool_free (dev->requests, dev->ep [i].dummy, - dev->ep [i].td_dma); - } - pci_pool_destroy (dev->requests); - } - if (dev->got_irq) - free_irq (pdev->irq, dev); - if (dev->regs) - iounmap (dev->regs); - if (dev->region) - release_mem_region (pci_resource_start (pdev, 0), - pci_resource_len (pdev, 0)); - if (dev->enabled) - pci_disable_device (pdev); - device_remove_file (&pdev->dev, &dev_attr_registers); - - INFO (dev, "unbind\n"); -} - -/* wrap this driver around the specified device, but - * don't respond over USB until a gadget driver binds to us. - */ - -static int net2280_probe (struct pci_dev *pdev, const struct pci_device_id *id) -{ - struct net2280 *dev; - unsigned long resource, len; - void __iomem *base = NULL; - int retval, i; - - /* alloc, and start init */ - dev = kzalloc (sizeof *dev, GFP_KERNEL); - if (dev == NULL){ - retval = -ENOMEM; - goto done; - } - - pci_set_drvdata (pdev, dev); - spin_lock_init (&dev->lock); - dev->pdev = pdev; - dev->gadget.ops = &net2280_ops; - dev->gadget.max_speed = USB_SPEED_HIGH; - - /* the "gadget" abstracts/virtualizes the controller */ - dev->gadget.name = driver_name; - - /* now all the pci goodies ... */ - if (pci_enable_device (pdev) < 0) { - retval = -ENODEV; - goto done; - } - dev->enabled = 1; - - /* BAR 0 holds all the registers - * BAR 1 is 8051 memory; unused here (note erratum 0103) - * BAR 2 is fifo memory; unused here - */ - resource = pci_resource_start (pdev, 0); - len = pci_resource_len (pdev, 0); - if (!request_mem_region (resource, len, driver_name)) { - DEBUG (dev, "controller already in use\n"); - retval = -EBUSY; - goto done; - } - dev->region = 1; - - /* FIXME provide firmware download interface to put - * 8051 code into the chip, e.g. to turn on PCI PM. - */ - - base = ioremap_nocache (resource, len); - if (base == NULL) { - DEBUG (dev, "can't map memory\n"); - retval = -EFAULT; - goto done; - } - dev->regs = (struct net2280_regs __iomem *) base; - dev->usb = (struct net2280_usb_regs __iomem *) (base + 0x0080); - dev->pci = (struct net2280_pci_regs __iomem *) (base + 0x0100); - dev->dma = (struct net2280_dma_regs __iomem *) (base + 0x0180); - dev->dep = (struct net2280_dep_regs __iomem *) (base + 0x0200); - dev->epregs = (struct net2280_ep_regs __iomem *) (base + 0x0300); - - /* put into initial config, link up all endpoints */ - writel (0, &dev->usb->usbctl); - usb_reset (dev); - usb_reinit (dev); - - /* irq setup after old hardware is cleaned up */ - if (!pdev->irq) { - ERROR (dev, "No IRQ. Check PCI setup!\n"); - retval = -ENODEV; - goto done; - } - - if (request_irq (pdev->irq, net2280_irq, IRQF_SHARED, driver_name, dev) - != 0) { - ERROR (dev, "request interrupt %d failed\n", pdev->irq); - retval = -EBUSY; - goto done; - } - dev->got_irq = 1; - - /* DMA setup */ - /* NOTE: we know only the 32 LSBs of dma addresses may be nonzero */ - dev->requests = pci_pool_create ("requests", pdev, - sizeof (struct net2280_dma), - 0 /* no alignment requirements */, - 0 /* or page-crossing issues */); - if (!dev->requests) { - DEBUG (dev, "can't get request pool\n"); - retval = -ENOMEM; - goto done; - } - for (i = 1; i < 5; i++) { - struct net2280_dma *td; - - td = pci_pool_alloc (dev->requests, GFP_KERNEL, - &dev->ep [i].td_dma); - if (!td) { - DEBUG (dev, "can't get dummy %d\n", i); - retval = -ENOMEM; - goto done; - } - td->dmacount = 0; /* not VALID */ - td->dmadesc = td->dmaaddr; - dev->ep [i].dummy = td; - } - - /* enable lower-overhead pci memory bursts during DMA */ - writel ( (1 << DMA_MEMORY_WRITE_AND_INVALIDATE_ENABLE) - // 256 write retries may not be enough... - // | (1 << PCI_RETRY_ABORT_ENABLE) - | (1 << DMA_READ_MULTIPLE_ENABLE) - | (1 << DMA_READ_LINE_ENABLE) - , &dev->pci->pcimstctl); - /* erratum 0115 shouldn't appear: Linux inits PCI_LATENCY_TIMER */ - pci_set_master (pdev); - pci_try_set_mwi (pdev); - - /* ... also flushes any posted pci writes */ - dev->chiprev = get_idx_reg (dev->regs, REG_CHIPREV) & 0xffff; - - /* done */ - INFO (dev, "%s\n", driver_desc); - INFO (dev, "irq %d, pci mem %p, chip rev %04x\n", - pdev->irq, base, dev->chiprev); - INFO (dev, "version: " DRIVER_VERSION "; dma %s\n", - use_dma - ? (use_dma_chaining ? "chaining" : "enabled") - : "disabled"); - retval = device_create_file (&pdev->dev, &dev_attr_registers); - if (retval) goto done; - - retval = usb_add_gadget_udc_release(&pdev->dev, &dev->gadget, - gadget_release); - if (retval) - goto done; - return 0; - -done: - if (dev) - net2280_remove (pdev); - return retval; -} - -/* make sure the board is quiescent; otherwise it will continue - * generating IRQs across the upcoming reboot. - */ - -static void net2280_shutdown (struct pci_dev *pdev) -{ - struct net2280 *dev = pci_get_drvdata (pdev); - - /* disable IRQs */ - writel (0, &dev->regs->pciirqenb0); - writel (0, &dev->regs->pciirqenb1); - - /* disable the pullup so the host will think we're gone */ - writel (0, &dev->usb->usbctl); - - /* Disable full-speed test mode */ - writel(0, &dev->usb->xcvrdiag); -} - - -/*-------------------------------------------------------------------------*/ - -static const struct pci_device_id pci_ids [] = { { - .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe), - .class_mask = ~0, - .vendor = 0x17cc, - .device = 0x2280, - .subvendor = PCI_ANY_ID, - .subdevice = PCI_ANY_ID, -}, { - .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe), - .class_mask = ~0, - .vendor = 0x17cc, - .device = 0x2282, - .subvendor = PCI_ANY_ID, - .subdevice = PCI_ANY_ID, - -}, { /* end: all zeroes */ } -}; -MODULE_DEVICE_TABLE (pci, pci_ids); - -/* pci driver glue; this is a "new style" PCI driver module */ -static struct pci_driver net2280_pci_driver = { - .name = (char *) driver_name, - .id_table = pci_ids, - - .probe = net2280_probe, - .remove = net2280_remove, - .shutdown = net2280_shutdown, - - /* FIXME add power management support */ -}; - -MODULE_DESCRIPTION (DRIVER_DESC); -MODULE_AUTHOR ("David Brownell"); -MODULE_LICENSE ("GPL"); - -static int __init init (void) -{ - if (!use_dma) - use_dma_chaining = 0; - return pci_register_driver (&net2280_pci_driver); -} -module_init (init); - -static void __exit cleanup (void) -{ - pci_unregister_driver (&net2280_pci_driver); -} -module_exit (cleanup); |
