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linux_dsm_epyc7002/drivers/usb/gadget/udc/net2280.c
Felipe Balbi ccf5fb6981 usb: gadget: net2280: silence sparse warning 
Silence the following warning:

drivers/usb/gadget/udc/net2280.c:3176:33: warning: context imbalance in
'handle_stat1_irqs' - unexpected unlock

Signed-off-by: Felipe Balbi <balbi@ti.com>
2015-03-10 15:33:31 -05:00

3646 lines
93 KiB
C
Raw Blame History

/*
* 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.
*
* MSI is enabled by default. The legacy IRQ is used if MSI couldn't
* be 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.
* Copyright (C) 2014 Ricardo Ribalda - Qtechnology/AS
*
* Modified Seth Levy 2005 PLX Technology, Inc. to provide compatibility
* with 2282 chip
*
* Modified Ricardo Ribalda Qtechnology AS to provide compatibility
* with usb 338x chip. Based on PLX driver
*
* 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.
*/
#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 <linux/io.h>
#include <asm/byteorder.h>
#include <asm/irq.h>
#include <asm/unaligned.h>
#define DRIVER_DESC "PLX NET228x/USB338x USB Peripheral Controller"
#define DRIVER_VERSION "2005 Sept 27/v3.0"
#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 u32 ep_bit[9] = { 0, 17, 2, 19, 4, 1, 18, 3, 20 };
static const char ep0name[] = "ep0";
static const char *const ep_name[] = {
ep0name,
"ep-a", "ep-b", "ep-c", "ep-d",
"ep-e", "ep-f", "ep-g", "ep-h",
};
/* Endpoint names for usb3380 advance mode */
static const char *const ep_name_adv[] = {
ep0name,
"ep1in", "ep2out", "ep3in", "ep4out",
"ep1out", "ep2in", "ep3out", "ep4in",
};
/* 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;
/* "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;
/* "modprobe net2280 enable_suspend=1" etc */
module_param(enable_suspend, bool, 0444);
#define DIR_STRING(bAddress) (((bAddress) & USB_DIR_IN) ? "in" : "out")
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";
}
#include "net2280.h"
#define valid_bit cpu_to_le32(BIT(VALID_BIT))
#define dma_done_ie cpu_to_le32(BIT(DMA_DONE_INTERRUPT_ENABLE))
/*-------------------------------------------------------------------------*/
static inline void enable_pciirqenb(struct net2280_ep *ep)
{
u32 tmp = readl(&ep->dev->regs->pciirqenb0);
if (ep->dev->quirks & PLX_LEGACY)
tmp |= BIT(ep->num);
else
tmp |= BIT(ep_bit[ep->num]);
writel(tmp, &ep->dev->regs->pciirqenb0);
return;
}
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;
static const u32 ep_key[9] = { 1, 0, 1, 0, 1, 1, 0, 1, 0 };
int ret = 0;
ep = container_of(_ep, struct net2280_ep, ep);
if (!_ep || !desc || ep->desc || _ep->name == ep0name ||
desc->bDescriptorType != USB_DT_ENDPOINT) {
pr_err("%s: failed at line=%d\n", __func__, __LINE__);
return -EINVAL;
}
dev = ep->dev;
if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
ret = -ESHUTDOWN;
goto print_err;
}
/* erratum 0119 workaround ties up an endpoint number */
if ((desc->bEndpointAddress & 0x0f) == EP_DONTUSE) {
ret = -EDOM;
goto print_err;
}
if (dev->quirks & PLX_SUPERSPEED) {
if ((desc->bEndpointAddress & 0x0f) >= 0x0c) {
ret = -EDOM;
goto print_err;
}
ep->is_in = !!usb_endpoint_dir_in(desc);
if (dev->enhanced_mode && ep->is_in && ep_key[ep->num]) {
ret = -EINVAL;
goto print_err;
}
}
/* sanity check ep-e/ep-f since their fifos are small */
max = usb_endpoint_maxp(desc) & 0x1fff;
if (ep->num > 4 && max > 64 && (dev->quirks & PLX_LEGACY)) {
ret = -ERANGE;
goto print_err;
}
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_max_speed(ep, max);
/* set type, direction, address; reset fifo counters */
writel(BIT(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(BIT(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_SUPER && max != 1024) ||
(dev->gadget.speed == USB_SPEED_HIGH && max != 512) ||
(dev->gadget.speed == USB_SPEED_FULL && max > 64)) {
spin_unlock_irqrestore(&dev->lock, flags);
ret = -ERANGE;
goto print_err;
}
}
ep->is_iso = (tmp == USB_ENDPOINT_XFER_ISOC);
/* Enable this endpoint */
if (dev->quirks & PLX_LEGACY) {
tmp <<= ENDPOINT_TYPE;
tmp |= desc->bEndpointAddress;
/* default full fifo lines */
tmp |= (4 << ENDPOINT_BYTE_COUNT);
tmp |= BIT(ENDPOINT_ENABLE);
ep->is_in = (tmp & USB_DIR_IN) != 0;
} else {
/* In Legacy mode, only OUT endpoints are used */
if (dev->enhanced_mode && ep->is_in) {
tmp <<= IN_ENDPOINT_TYPE;
tmp |= BIT(IN_ENDPOINT_ENABLE);
/* Not applicable to Legacy */
tmp |= BIT(ENDPOINT_DIRECTION);
} else {
tmp <<= OUT_ENDPOINT_TYPE;
tmp |= BIT(OUT_ENDPOINT_ENABLE);
tmp |= (ep->is_in << ENDPOINT_DIRECTION);
}
tmp |= usb_endpoint_num(desc);
tmp |= (ep->ep.maxburst << MAX_BURST_SIZE);
}
/* Make sure all the registers are written before ep_rsp*/
wmb();
/* for OUT transfers, block the rx fifo until a read is posted */
if (!ep->is_in)
writel(BIT(SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
else if (!(dev->quirks & PLX_2280)) {
/* Added for 2282, Don't use nak packets on an in endpoint,
* this was ignored on 2280
*/
writel(BIT(CLEAR_NAK_OUT_PACKETS) |
BIT(CLEAR_NAK_OUT_PACKETS_MODE), &ep->regs->ep_rsp);
}
writel(tmp, &ep->cfg->ep_cfg);
/* enable irqs */
if (!ep->dma) { /* pio, per-packet */
enable_pciirqenb(ep);
tmp = BIT(DATA_PACKET_RECEIVED_INTERRUPT_ENABLE) |
BIT(DATA_PACKET_TRANSMITTED_INTERRUPT_ENABLE);
if (dev->quirks & PLX_2280)
tmp |= readl(&ep->regs->ep_irqenb);
writel(tmp, &ep->regs->ep_irqenb);
} else { /* dma, per-request */
tmp = BIT((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 = BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT_ENABLE);
writel(tmp, &ep->regs->ep_irqenb);
enable_pciirqenb(ep);
}
}
tmp = desc->bEndpointAddress;
ep_dbg(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 ret;
print_err:
dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, ret);
return ret;
}
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_228x(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(BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) |
BIT(DMA_TRANSACTION_DONE_INTERRUPT) |
BIT(DMA_ABORT),
&ep->dma->dmastat);
tmp = readl(&regs->pciirqenb0);
tmp &= ~BIT(ep->num);
writel(tmp, &regs->pciirqenb0);
} else {
tmp = readl(&regs->pciirqenb1);
tmp &= ~BIT((8 + ep->num)); /* completion */
writel(tmp, &regs->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->quirks & PLX_2280)) {
tmp = BIT(SET_NAK_OUT_PACKETS_MODE) |
BIT(SET_NAK_OUT_PACKETS) |
BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
BIT(CLEAR_INTERRUPT_MODE);
} else {
/* added for 2282 */
tmp = BIT(CLEAR_NAK_OUT_PACKETS_MODE) |
BIT(CLEAR_NAK_OUT_PACKETS) |
BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
BIT(CLEAR_INTERRUPT_MODE);
}
if (ep->num != 0) {
tmp |= BIT(CLEAR_ENDPOINT_TOGGLE) |
BIT(CLEAR_ENDPOINT_HALT);
}
writel(tmp, &ep->regs->ep_rsp);
/* scrub most status bits, and flush any fifo state */
if (ep->dev->quirks & PLX_2280)
tmp = BIT(FIFO_OVERFLOW) |
BIT(FIFO_UNDERFLOW);
else
tmp = 0;
writel(tmp | BIT(TIMEOUT) |
BIT(USB_STALL_SENT) |
BIT(USB_IN_NAK_SENT) |
BIT(USB_IN_ACK_RCVD) |
BIT(USB_OUT_PING_NAK_SENT) |
BIT(USB_OUT_ACK_SENT) |
BIT(FIFO_FLUSH) |
BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
BIT(DATA_IN_TOKEN_INTERRUPT),
&ep->regs->ep_stat);
/* fifo size is handled separately */
}
static void ep_reset_338x(struct net2280_regs __iomem *regs,
struct net2280_ep *ep)
{
u32 tmp, dmastat;
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(BIT(DMA_ABORT_DONE_INTERRUPT) |
BIT(DMA_PAUSE_DONE_INTERRUPT) |
BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) |
BIT(DMA_TRANSACTION_DONE_INTERRUPT),
/* | BIT(DMA_ABORT), */
&ep->dma->dmastat);
dmastat = readl(&ep->dma->dmastat);
if (dmastat == 0x5002) {
ep_warn(ep->dev, "The dmastat return = %x!!\n",
dmastat);
writel(0x5a, &ep->dma->dmastat);
}
tmp = readl(&regs->pciirqenb0);
tmp &= ~BIT(ep_bit[ep->num]);
writel(tmp, &regs->pciirqenb0);
} else {
if (ep->num < 5) {
tmp = readl(&regs->pciirqenb1);
tmp &= ~BIT((8 + ep->num)); /* completion */
writel(tmp, &regs->pciirqenb1);
}
}
writel(0, &ep->regs->ep_irqenb);
writel(BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
BIT(FIFO_OVERFLOW) |
BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
BIT(DATA_IN_TOKEN_INTERRUPT), &ep->regs->ep_stat);
}
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) {
pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
return -EINVAL;
}
spin_lock_irqsave(&ep->dev->lock, flags);
nuke(ep);
if (ep->dev->quirks & PLX_SUPERSPEED)
ep_reset_338x(ep->dev->regs, ep);
else
ep_reset_228x(ep->dev->regs, ep);
ep_vdbg(ep->dev, "disabled %s %s\n",
ep->dma ? "dma" : "pio", _ep->name);
/* synch memory views with the device */
(void)readl(&ep->cfg->ep_cfg);
if (!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) {
pr_err("%s: Invalid ep\n", __func__);
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) {
dev_err(&ep->dev->pdev->dev, "%s: Inavlid ep=%p or req=%p\n",
__func__, _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;
ep_vdbg(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, &regs->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, &regs->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;
statp = &ep->regs->ep_stat;
tmp = readl(statp);
if (tmp & BIT(NAK_OUT_PACKETS)) {
ep_dbg(ep->dev, "%s %s %08x !NAK\n",
ep->ep.name, __func__, tmp);
writel(BIT(SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
}
writel(BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
BIT(DATA_PACKET_RECEIVED_INTERRUPT),
statp);
writel(BIT(FIFO_FLUSH), statp);
/* Make sure that stap is written */
mb();
tmp = readl(statp);
if (tmp & BIT(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, BIT(USB_OUT_PING_NAK_SENT),
BIT(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 & BIT(NAK_OUT_PACKETS)))
cleanup = 1;
else if ((tmp & BIT(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(&regs->ep_avail);
if (unlikely(count == 0)) {
udelay(1);
tmp = readl(&ep->regs->ep_stat);
count = readl(&regs->ep_avail);
/* handled that data already? */
if (count == 0 && (tmp & BIT(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) {
ep_err(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);
ep_vdbg(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(&regs->ep_data);
cpu_to_le32s(&tmp);
put_unaligned(tmp, (u32 *)buf);
buf += 4;
count -= 4;
}
if (count) {
tmp = readl(&regs->ep_data);
/* LE conversion is implicit here: */
do {
*buf++ = (u8) tmp;
tmp >>= 8;
} while (--count);
}
if (cleanup)
out_flush(ep);
if (prevent) {
writel(BIT(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 |= BIT(DMA_DIRECTION);
if ((!ep->is_in && (dmacount % ep->ep.maxpacket) != 0) ||
!(ep->dev->quirks & PLX_2280))
dmacount |= BIT(END_OF_CHAIN);
req->valid = valid;
if (valid)
dmacount |= BIT(VALID_BIT);
dmacount |= BIT(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 =
BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) |
BIT(DMA_CLEAR_COUNT_ENABLE) |
/* erratum 0116 workaround part 1 (use POLLING) */
(POLL_100_USEC << DESCRIPTOR_POLLING_RATE) |
BIT(DMA_VALID_BIT_POLLING_ENABLE) |
BIT(DMA_VALID_BIT_ENABLE) |
BIT(DMA_SCATTER_GATHER_ENABLE) |
/* erratum 0116 workaround part 2 (no AUTOSTART) */
BIT(DMA_ENABLE);
static inline void spin_stop_dma(struct net2280_dma_regs __iomem *dma)
{
handshake(&dma->dmactl, BIT(DMA_ENABLE), 0, 50);
}
static inline void stop_dma(struct net2280_dma_regs __iomem *dma)
{
writel(readl(&dma->dmactl) & ~BIT(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 = BIT(VALID_BIT) | (ep->is_in << DMA_DIRECTION);
if (!(ep->dev->quirks & PLX_2280))
tmp |= BIT(END_OF_CHAIN);
writel(tmp, &dma->dmacount);
writel(readl(&dma->dmastat), &dma->dmastat);
writel(td_dma, &dma->dmadesc);
if (ep->dev->quirks & PLX_SUPERSPEED)
dmactl |= BIT(DMA_REQUEST_OUTSTANDING);
writel(dmactl, &dma->dmactl);
/* erratum 0116 workaround part 3: pci arbiter away from net2280 */
(void) readl(&ep->dev->pci->pcimstctl);
writel(BIT(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) & BIT(DMA_ENABLE));
writel(0, &ep->dma->dmactl);
/* previous OUT packet might have been short */
if (!ep->is_in && (readl(&ep->regs->ep_stat) &
BIT(NAK_OUT_PACKETS))) {
writel(BIT(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(BIT(DMA_DONE_INTERRUPT_ENABLE) | tmp,
&dma->dmacount);
req->td->dmadesc = 0;
req->valid = 1;
writel(BIT(DMA_ENABLE), &dma->dmactl);
writel(BIT(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) ||
req->req.zero)){
tmp |= BIT(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);
req->td->dmacount |= cpu_to_le32(BIT(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)
ep_vdbg(dev, "complete %s req %p stat %d len %u/%u\n",
ep->ep.name, &req->req, status,
req->req.actual, req->req.length);
/* don't modify queue heads during completion callback */
ep->stopped = 1;
spin_unlock(&dev->lock);
usb_gadget_giveback_request(&ep->ep, &req->req);
spin_lock(&dev->lock);
ep->stopped = stopped;
}
/*-------------------------------------------------------------------------*/
static 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;
int ret = 0;
/* we always require a cpu-view buffer, so that we can
* always use pio (as fallback or whatever).
*/
ep = container_of(_ep, struct net2280_ep, ep);
if (!_ep || (!ep->desc && ep->num != 0)) {
pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
return -EINVAL;
}
req = container_of(_req, struct net2280_request, req);
if (!_req || !_req->complete || !_req->buf ||
!list_empty(&req->queue)) {
ret = -EINVAL;
goto print_err;
}
if (_req->length > (~0 & DMA_BYTE_COUNT_MASK)) {
ret = -EDOM;
goto print_err;
}
dev = ep->dev;
if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
ret = -ESHUTDOWN;
goto print_err;
}
/* FIXME implement PIO fallback for ZLPs with DMA */
if (ep->dma && _req->length == 0) {
ret = -EOPNOTSUPP;
goto print_err;
}
/* set up dma mapping in case the caller didn't */
if (ep->dma) {
ret = usb_gadget_map_request(&dev->gadget, _req,
ep->is_in);
if (ret)
goto print_err;
}
ep_vdbg(dev, "%s queue req %p, len %d buf %p\n",
_ep->name, _req, _req->length, _req->buf);
spin_lock_irqsave(&dev->lock, flags);
_req->status = -EINPROGRESS;
_req->actual = 0;
/* kickstart this i/o queue? */
if (list_empty(&ep->queue) && !ep->stopped &&
!((dev->quirks & PLX_SUPERSPEED) && ep->dma &&
(readl(&ep->regs->ep_rsp) & BIT(CLEAR_ENDPOINT_HALT)))) {
/* 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);
ep_vdbg(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 & BIT(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) &&
ep->num == 0) {
done(ep, req, 0);
allow_status(ep);
/* don't queue it */
req = NULL;
} else if (read_fifo(ep, req) &&
ep->num != 0) {
done(ep, req, 0);
req = NULL;
} else
s = readl(&ep->regs->ep_stat);
}
/* don't NAK, let the fifo fill */
if (req && (s & BIT(NAK_OUT_PACKETS)))
writel(BIT(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));
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 ret;
print_err:
dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, ret);
return ret;
}
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 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 & BIT(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) &&
!(ep->dev->quirks & PLX_SUPERSPEED)) {
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 & BIT(NAK_OUT_PACKETS)) == 0) {
ep_warn(ep->dev, "%s lost packet sync!\n",
ep->ep.name);
req->req.status = -EOVERFLOW;
} else {
tmp = readl(&ep->regs->ep_avail);
if (tmp) {
/* fifo gets flushed later */
ep->out_overflow = 1;
ep_dbg(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;
if (ep->stopped)
return;
req = list_entry(ep->queue.next, struct net2280_request, queue);
start_dma(ep, req);
}
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(BIT(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) {
pr_err("%s: Invalid ep=%p or ep->desc or req=%p\n",
__func__, _ep, _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);
dev_err(&ep->dev->pdev->dev, "%s: Request mismatch\n",
__func__);
return -EINVAL;
}
/* queue head may be partially complete. */
if (ep->queue.next == &req->queue) {
if (ep->dma) {
ep_dbg(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 {
ep_dbg(ep->dev, "unlink (%s) pio\n", _ep->name);
done(ep, req, -ECONNRESET);
}
req = NULL;
}
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)) {
pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
return -EINVAL;
}
if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
retval = -ESHUTDOWN;
goto print_err;
}
if (ep->desc /* not ep0 */ && (ep->desc->bmAttributes & 0x03)
== USB_ENDPOINT_XFER_ISOC) {
retval = -EINVAL;
goto print_err;
}
spin_lock_irqsave(&ep->dev->lock, flags);
if (!list_empty(&ep->queue)) {
retval = -EAGAIN;
goto print_unlock;
} else if (ep->is_in && value && net2280_fifo_status(_ep) != 0) {
retval = -EAGAIN;
goto print_unlock;
} else {
ep_vdbg(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);
if (ep->dev->quirks & PLX_SUPERSPEED &&
!list_empty(&ep->queue) && ep->td_dma)
restart_dma(ep);
ep->wedged = 0;
}
(void) readl(&ep->regs->ep_rsp);
}
spin_unlock_irqrestore(&ep->dev->lock, flags);
return retval;
print_unlock:
spin_unlock_irqrestore(&ep->dev->lock, flags);
print_err:
dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, retval);
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) {
pr_err("%s: Invalid ep=%p or ep0\n", __func__, _ep);
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)) {
pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
return -ENODEV;
}
if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
dev_err(&ep->dev->pdev->dev,
"%s: Invalid driver=%p or speed=%d\n",
__func__, ep->dev->driver, ep->dev->gadget.speed);
return -ESHUTDOWN;
}
avail = readl(&ep->regs->ep_avail) & (BIT(12) - 1);
if (avail > ep->fifo_size) {
dev_err(&ep->dev->pdev->dev, "%s: Fifo overflow\n", __func__);
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)) {
pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
return;
}
if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
dev_err(&ep->dev->pdev->dev,
"%s: Invalid driver=%p or speed=%d\n",
__func__, ep->dev->driver, ep->dev->gadget.speed);
return;
}
writel(BIT(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 & BIT(DEVICE_REMOTE_WAKEUP_ENABLE))
writel(BIT(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 |= BIT(SELF_POWERED_STATUS);
_gadget->is_selfpowered = 1;
} else {
tmp &= ~BIT(SELF_POWERED_STATUS);
_gadget->is_selfpowered = 0;
}
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 |= BIT(USB_DETECT_ENABLE);
else
tmp &= ~BIT(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);
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\n\n"
"devinit %03x fifoctl %08x gadget '%s'\n"
"pci irqenb0 %02x irqenb1 %08x "
"irqstat0 %04x irqstat1 %08x\n",
driver_name, dev->chiprev,
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 & BIT(VBUS_PIN)) {
if (t2 & BIT(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 < dev->n_ep; i++) {
struct net2280_ep *ep;
ep = &dev->ep[i];
if (i && !ep->desc)
continue;
t1 = readl(&ep->cfg->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 & BIT(CLEAR_NAK_OUT_PACKETS))
? "NAK " : "",
(t2 & BIT(CLEAR_EP_HIDE_STATUS_PHASE))
? "hide " : "",
(t2 & BIT(CLEAR_EP_FORCE_CRC_ERROR))
? "CRC " : "",
(t2 & BIT(CLEAR_INTERRUPT_MODE))
? "interrupt " : "",
(t2 & BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE))
? "status " : "",
(t2 & BIT(CLEAR_NAK_OUT_PACKETS_MODE))
? "NAKmode " : "",
(t2 & BIT(CLEAR_ENDPOINT_TOGGLE))
? "DATA1 " : "DATA0 ",
(t2 & BIT(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 < dev->n_ep; 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 < dev->n_ep; 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",
type_string(d->bmAttributes),
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);
}
static void defect7374_disable_data_eps(struct net2280 *dev)
{
/*
* For Defect 7374, disable data EPs (and more):
* - This phase undoes the earlier phase of the Defect 7374 workaround,
* returing ep regs back to normal.
*/
struct net2280_ep *ep;
int i;
unsigned char ep_sel;
u32 tmp_reg;
for (i = 1; i < 5; i++) {
ep = &dev->ep[i];
writel(0, &ep->cfg->ep_cfg);
}
/* CSROUT, CSRIN, PCIOUT, PCIIN, STATIN, RCIN */
for (i = 0; i < 6; i++)
writel(0, &dev->dep[i].dep_cfg);
for (ep_sel = 0; ep_sel <= 21; ep_sel++) {
/* Select an endpoint for subsequent operations: */
tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
writel(((tmp_reg & ~0x1f) | ep_sel), &dev->plregs->pl_ep_ctrl);
if (ep_sel < 2 || (ep_sel > 9 && ep_sel < 14) ||
ep_sel == 18 || ep_sel == 20)
continue;
/* Change settings on some selected endpoints */
tmp_reg = readl(&dev->plregs->pl_ep_cfg_4);
tmp_reg &= ~BIT(NON_CTRL_IN_TOLERATE_BAD_DIR);
writel(tmp_reg, &dev->plregs->pl_ep_cfg_4);
tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
tmp_reg |= BIT(EP_INITIALIZED);
writel(tmp_reg, &dev->plregs->pl_ep_ctrl);
}
}
static void defect7374_enable_data_eps_zero(struct net2280 *dev)
{
u32 tmp = 0, tmp_reg;
u32 scratch;
int i;
unsigned char ep_sel;
scratch = get_idx_reg(dev->regs, SCRATCH);
WARN_ON((scratch & (0xf << DEFECT7374_FSM_FIELD))
== DEFECT7374_FSM_SS_CONTROL_READ);
scratch &= ~(0xf << DEFECT7374_FSM_FIELD);
ep_warn(dev, "Operate Defect 7374 workaround soft this time");
ep_warn(dev, "It will operate on cold-reboot and SS connect");
/*GPEPs:*/
tmp = ((0 << ENDPOINT_NUMBER) | BIT(ENDPOINT_DIRECTION) |
(2 << OUT_ENDPOINT_TYPE) | (2 << IN_ENDPOINT_TYPE) |
((dev->enhanced_mode) ?
BIT(OUT_ENDPOINT_ENABLE) : BIT(ENDPOINT_ENABLE)) |
BIT(IN_ENDPOINT_ENABLE));
for (i = 1; i < 5; i++)
writel(tmp, &dev->ep[i].cfg->ep_cfg);
/* CSRIN, PCIIN, STATIN, RCIN*/
tmp = ((0 << ENDPOINT_NUMBER) | BIT(ENDPOINT_ENABLE));
writel(tmp, &dev->dep[1].dep_cfg);
writel(tmp, &dev->dep[3].dep_cfg);
writel(tmp, &dev->dep[4].dep_cfg);
writel(tmp, &dev->dep[5].dep_cfg);
/*Implemented for development and debug.
* Can be refined/tuned later.*/
for (ep_sel = 0; ep_sel <= 21; ep_sel++) {
/* Select an endpoint for subsequent operations: */
tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
writel(((tmp_reg & ~0x1f) | ep_sel),
&dev->plregs->pl_ep_ctrl);
if (ep_sel == 1) {
tmp =
(readl(&dev->plregs->pl_ep_ctrl) |
BIT(CLEAR_ACK_ERROR_CODE) | 0);
writel(tmp, &dev->plregs->pl_ep_ctrl);
continue;
}
if (ep_sel == 0 || (ep_sel > 9 && ep_sel < 14) ||
ep_sel == 18 || ep_sel == 20)
continue;
tmp = (readl(&dev->plregs->pl_ep_cfg_4) |
BIT(NON_CTRL_IN_TOLERATE_BAD_DIR) | 0);
writel(tmp, &dev->plregs->pl_ep_cfg_4);
tmp = readl(&dev->plregs->pl_ep_ctrl) &
~BIT(EP_INITIALIZED);
writel(tmp, &dev->plregs->pl_ep_ctrl);
}
/* Set FSM to focus on the first Control Read:
* - Tip: Connection speed is known upon the first
* setup request.*/
scratch |= DEFECT7374_FSM_WAITING_FOR_CONTROL_READ;
set_idx_reg(dev->regs, SCRATCH, scratch);
}
/* 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_228x(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(~(u32)BIT(SUSPEND_REQUEST_INTERRUPT), &dev->regs->irqstat1),
/* reset, and enable pci */
tmp = readl(&dev->regs->devinit) |
BIT(PCI_ENABLE) |
BIT(FIFO_SOFT_RESET) |
BIT(USB_SOFT_RESET) |
BIT(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_reset_338x(struct net2280 *dev)
{
u32 tmp;
dev->gadget.speed = USB_SPEED_UNKNOWN;
(void)readl(&dev->usb->usbctl);
net2280_led_init(dev);
if (dev->bug7734_patched) {
/* 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(~0, &dev->regs->irqstat1);
if (dev->bug7734_patched) {
/* reset, and enable pci */
tmp = readl(&dev->regs->devinit) |
BIT(PCI_ENABLE) |
BIT(FIFO_SOFT_RESET) |
BIT(USB_SOFT_RESET) |
BIT(M8051_RESET);
writel(tmp, &dev->regs->devinit);
}
/* always ep-{1,2,3,4} ... maybe not ep-3 or ep-4 */
INIT_LIST_HEAD(&dev->gadget.ep_list);
for (tmp = 1; tmp < dev->n_ep; tmp++)
list_add_tail(&dev->ep[tmp].ep.ep_list, &dev->gadget.ep_list);
}
static void usb_reset(struct net2280 *dev)
{
if (dev->quirks & PLX_LEGACY)
return usb_reset_228x(dev);
return usb_reset_338x(dev);
}
static void usb_reinit_228x(struct net2280 *dev)
{
u32 tmp;
/* 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;
ep->dma = &dev->dma[tmp - 1];
} else
ep->fifo_size = 64;
ep->regs = &dev->epregs[tmp];
ep->cfg = &dev->epregs[tmp];
ep_reset_228x(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 usb_reinit_338x(struct net2280 *dev)
{
int i;
u32 tmp, val;
static const u32 ne[9] = { 0, 1, 2, 3, 4, 1, 2, 3, 4 };
static const u32 ep_reg_addr[9] = { 0x00, 0xC0, 0x00, 0xC0, 0x00,
0x00, 0xC0, 0x00, 0xC0 };
/* basic endpoint init */
for (i = 0; i < dev->n_ep; i++) {
struct net2280_ep *ep = &dev->ep[i];
ep->ep.name = dev->enhanced_mode ? ep_name_adv[i] : ep_name[i];
ep->dev = dev;
ep->num = i;
if (i > 0 && i <= 4)
ep->dma = &dev->dma[i - 1];
if (dev->enhanced_mode) {
ep->cfg = &dev->epregs[ne[i]];
ep->regs = (struct net2280_ep_regs __iomem *)
(((void __iomem *)&dev->epregs[ne[i]]) +
ep_reg_addr[i]);
} else {
ep->cfg = &dev->epregs[i];
ep->regs = &dev->epregs[i];
}
ep->fifo_size = (i != 0) ? 2048 : 512;
ep_reset_338x(dev->regs, ep);
}
usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 512);
dev->gadget.ep0 = &dev->ep[0].ep;
dev->ep[0].stopped = 0;
/* Link layer set up */
if (dev->bug7734_patched) {
tmp = readl(&dev->usb_ext->usbctl2) &
~(BIT(U1_ENABLE) | BIT(U2_ENABLE) | BIT(LTM_ENABLE));
writel(tmp, &dev->usb_ext->usbctl2);
}
/* Hardware Defect and Workaround */
val = readl(&dev->ll_lfps_regs->ll_lfps_5);
val &= ~(0xf << TIMER_LFPS_6US);
val |= 0x5 << TIMER_LFPS_6US;
writel(val, &dev->ll_lfps_regs->ll_lfps_5);
val = readl(&dev->ll_lfps_regs->ll_lfps_6);
val &= ~(0xffff << TIMER_LFPS_80US);
val |= 0x0100 << TIMER_LFPS_80US;
writel(val, &dev->ll_lfps_regs->ll_lfps_6);
/*
* AA_AB Errata. Issue 4. Workaround for SuperSpeed USB
* Hot Reset Exit Handshake may Fail in Specific Case using
* Default Register Settings. Workaround for Enumeration test.
*/
val = readl(&dev->ll_tsn_regs->ll_tsn_counters_2);
val &= ~(0x1f << HOT_TX_NORESET_TS2);
val |= 0x10 << HOT_TX_NORESET_TS2;
writel(val, &dev->ll_tsn_regs->ll_tsn_counters_2);
val = readl(&dev->ll_tsn_regs->ll_tsn_counters_3);
val &= ~(0x1f << HOT_RX_RESET_TS2);
val |= 0x3 << HOT_RX_RESET_TS2;
writel(val, &dev->ll_tsn_regs->ll_tsn_counters_3);
/*
* Set Recovery Idle to Recover bit:
* - On SS connections, setting Recovery Idle to Recover Fmw improves
* link robustness with various hosts and hubs.
* - It is safe to set for all connection speeds; all chip revisions.
* - R-M-W to leave other bits undisturbed.
* - Reference PLX TT-7372
*/
val = readl(&dev->ll_chicken_reg->ll_tsn_chicken_bit);
val |= BIT(RECOVERY_IDLE_TO_RECOVER_FMW);
writel(val, &dev->ll_chicken_reg->ll_tsn_chicken_bit);
INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
/* disable dedicated endpoints */
writel(0x0D, &dev->dep[0].dep_cfg);
writel(0x0D, &dev->dep[1].dep_cfg);
writel(0x0E, &dev->dep[2].dep_cfg);
writel(0x0E, &dev->dep[3].dep_cfg);
writel(0x0F, &dev->dep[4].dep_cfg);
writel(0x0C, &dev->dep[5].dep_cfg);
}
static void usb_reinit(struct net2280 *dev)
{
if (dev->quirks & PLX_LEGACY)
return usb_reinit_228x(dev);
return usb_reinit_338x(dev);
}
static void ep0_start_228x(struct net2280 *dev)
{
writel(BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
BIT(CLEAR_NAK_OUT_PACKETS) |
BIT(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(BIT(SET_TEST_MODE) |
BIT(SET_ADDRESS) |
BIT(DEVICE_SET_CLEAR_DEVICE_REMOTE_WAKEUP) |
BIT(GET_DEVICE_STATUS) |
BIT(GET_INTERFACE_STATUS),
&dev->usb->stdrsp);
writel(BIT(USB_ROOT_PORT_WAKEUP_ENABLE) |
BIT(SELF_POWERED_USB_DEVICE) |
BIT(REMOTE_WAKEUP_SUPPORT) |
(dev->softconnect << USB_DETECT_ENABLE) |
BIT(SELF_POWERED_STATUS),
&dev->usb->usbctl);
/* enable irqs so we can see ep0 and general operation */
writel(BIT(SETUP_PACKET_INTERRUPT_ENABLE) |
BIT(ENDPOINT_0_INTERRUPT_ENABLE),
&dev->regs->pciirqenb0);
writel(BIT(PCI_INTERRUPT_ENABLE) |
BIT(PCI_MASTER_ABORT_RECEIVED_INTERRUPT_ENABLE) |
BIT(PCI_TARGET_ABORT_RECEIVED_INTERRUPT_ENABLE) |
BIT(PCI_RETRY_ABORT_INTERRUPT_ENABLE) |
BIT(VBUS_INTERRUPT_ENABLE) |
BIT(ROOT_PORT_RESET_INTERRUPT_ENABLE) |
BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE),
&dev->regs->pciirqenb1);
/* don't leave any writes posted */
(void) readl(&dev->usb->usbctl);
}
static void ep0_start_338x(struct net2280 *dev)
{
if (dev->bug7734_patched)
writel(BIT(CLEAR_NAK_OUT_PACKETS_MODE) |
BIT(SET_EP_HIDE_STATUS_PHASE),
&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(BIT(SET_ISOCHRONOUS_DELAY) |
BIT(SET_SEL) |
BIT(SET_TEST_MODE) |
BIT(SET_ADDRESS) |
BIT(GET_INTERFACE_STATUS) |
BIT(GET_DEVICE_STATUS),
&dev->usb->stdrsp);
dev->wakeup_enable = 1;
writel(BIT(USB_ROOT_PORT_WAKEUP_ENABLE) |
(dev->softconnect << USB_DETECT_ENABLE) |
BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
&dev->usb->usbctl);
/* enable irqs so we can see ep0 and general operation */
writel(BIT(SETUP_PACKET_INTERRUPT_ENABLE) |
BIT(ENDPOINT_0_INTERRUPT_ENABLE),
&dev->regs->pciirqenb0);
writel(BIT(PCI_INTERRUPT_ENABLE) |
BIT(ROOT_PORT_RESET_INTERRUPT_ENABLE) |
BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE) |
BIT(VBUS_INTERRUPT_ENABLE),
&dev->regs->pciirqenb1);
/* don't leave any writes posted */
(void)readl(&dev->usb->usbctl);
}
static void ep0_start(struct net2280 *dev)
{
if (dev->quirks & PLX_LEGACY)
return ep0_start_228x(dev);
return ep0_start_338x(dev);
}
/* 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 < dev->n_ep; i++)
dev->ep[i].irqs = 0;
/* hook up the driver ... */
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 host detection and ep0; and we're ready
* for set_configuration as well as eventual disconnect.
*/
net2280_led_active(dev, 1);
if ((dev->quirks & PLX_SUPERSPEED) && !dev->bug7734_patched)
defect7374_enable_data_eps_zero(dev);
ep0_start(dev);
/* 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 < dev->n_ep; 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 net2280 *dev;
unsigned long flags;
dev = container_of(_gadget, struct net2280, gadget);
spin_lock_irqsave(&dev->lock, flags);
stop_activity(dev, NULL);
spin_unlock_irqrestore(&dev->lock, flags);
net2280_led_active(dev, 0);
device_remove_file(&dev->pdev->dev, &dev_attr_function);
device_remove_file(&dev->pdev->dev, &dev_attr_queues);
dev->driver = NULL;
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++;
ep_vdbg(ep->dev, "%s ack ep_stat %08x, req %p\n",
ep->ep.name, t, req ? &req->req : NULL);
if (!ep->is_in || (ep->dev->quirks & PLX_2280))
writel(t & ~BIT(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 & BIT(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 & BIT(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 & BIT(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 & BIT(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 & BIT(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 & BIT(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(BIT(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
ep_dbg(ep->dev, "%s dma ep_stat %08x ??\n",
ep->ep.name, t);
return;
/* data packet(s) received (in the fifo, OUT) */
} else if (t & BIT(DATA_PACKET_RECEIVED_INTERRUPT)) {
if (read_fifo(ep, req) && ep->num != 0)
mode = 2;
/* data packet(s) transmitted (IN) */
} else if (t & BIT(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 */
/* send zlps until the status stage */
if ((req->req.actual == req->req.length) &&
(!req->req.zero || len != ep->ep.maxpacket) && ep->num)
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 & BIT(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 defect7374_workaround(struct net2280 *dev, struct usb_ctrlrequest r)
{
u32 scratch, fsmvalue;
u32 ack_wait_timeout, state;
/* Workaround for Defect 7374 (U1/U2 erroneously rejected): */
scratch = get_idx_reg(dev->regs, SCRATCH);
fsmvalue = scratch & (0xf << DEFECT7374_FSM_FIELD);
scratch &= ~(0xf << DEFECT7374_FSM_FIELD);
if (!((fsmvalue == DEFECT7374_FSM_WAITING_FOR_CONTROL_READ) &&
(r.bRequestType & USB_DIR_IN)))
return;
/* This is the first Control Read for this connection: */
if (!(readl(&dev->usb->usbstat) & BIT(SUPER_SPEED_MODE))) {
/*
* Connection is NOT SS:
* - Connection must be FS or HS.
* - This FSM state should allow workaround software to
* run after the next USB connection.
*/
scratch |= DEFECT7374_FSM_NON_SS_CONTROL_READ;
dev->bug7734_patched = 1;
goto restore_data_eps;
}
/* Connection is SS: */
for (ack_wait_timeout = 0;
ack_wait_timeout < DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS;
ack_wait_timeout++) {
state = readl(&dev->plregs->pl_ep_status_1)
& (0xff << STATE);
if ((state >= (ACK_GOOD_NORMAL << STATE)) &&
(state <= (ACK_GOOD_MORE_ACKS_TO_COME << STATE))) {
scratch |= DEFECT7374_FSM_SS_CONTROL_READ;
dev->bug7734_patched = 1;
break;
}
/*
* We have not yet received host's Data Phase ACK
* - Wait and try again.
*/
udelay(DEFECT_7374_PROCESSOR_WAIT_TIME);
continue;
}
if (ack_wait_timeout >= DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS) {
ep_err(dev, "FAIL: Defect 7374 workaround waited but failed "
"to detect SS host's data phase ACK.");
ep_err(dev, "PL_EP_STATUS_1(23:16):.Expected from 0x11 to 0x16"
"got 0x%2.2x.\n", state >> STATE);
} else {
ep_warn(dev, "INFO: Defect 7374 workaround waited about\n"
"%duSec for Control Read Data Phase ACK\n",
DEFECT_7374_PROCESSOR_WAIT_TIME * ack_wait_timeout);
}
restore_data_eps:
/*
* Restore data EPs to their pre-workaround settings (disabled,
* initialized, and other details).
*/
defect7374_disable_data_eps(dev);
set_idx_reg(dev->regs, SCRATCH, scratch);
return;
}
static void ep_clear_seqnum(struct net2280_ep *ep)
{
struct net2280 *dev = ep->dev;
u32 val;
static const u32 ep_pl[9] = { 0, 3, 4, 7, 8, 2, 5, 6, 9 };
val = readl(&dev->plregs->pl_ep_ctrl) & ~0x1f;
val |= ep_pl[ep->num];
writel(val, &dev->plregs->pl_ep_ctrl);
val |= BIT(SEQUENCE_NUMBER_RESET);
writel(val, &dev->plregs->pl_ep_ctrl);
return;
}
static void handle_stat0_irqs_superspeed(struct net2280 *dev,
struct net2280_ep *ep, struct usb_ctrlrequest r)
{
int tmp = 0;
#define w_value le16_to_cpu(r.wValue)
#define w_index le16_to_cpu(r.wIndex)
#define w_length le16_to_cpu(r.wLength)
switch (r.bRequest) {
struct net2280_ep *e;
u16 status;
case USB_REQ_SET_CONFIGURATION:
dev->addressed_state = !w_value;
goto usb3_delegate;
case USB_REQ_GET_STATUS:
switch (r.bRequestType) {
case (USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
status = dev->wakeup_enable ? 0x02 : 0x00;
if (dev->gadget.is_selfpowered)
status |= BIT(0);
status |= (dev->u1_enable << 2 | dev->u2_enable << 3 |
dev->ltm_enable << 4);
writel(0, &dev->epregs[0].ep_irqenb);
set_fifo_bytecount(ep, sizeof(status));
writel((__force u32) status, &dev->epregs[0].ep_data);
allow_status_338x(ep);
break;
case (USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
e = get_ep_by_addr(dev, w_index);
if (!e)
goto do_stall3;
status = readl(&e->regs->ep_rsp) &
BIT(CLEAR_ENDPOINT_HALT);
writel(0, &dev->epregs[0].ep_irqenb);
set_fifo_bytecount(ep, sizeof(status));
writel((__force u32) status, &dev->epregs[0].ep_data);
allow_status_338x(ep);
break;
default:
goto usb3_delegate;
}
break;
case USB_REQ_CLEAR_FEATURE:
switch (r.bRequestType) {
case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
if (!dev->addressed_state) {
switch (w_value) {
case USB_DEVICE_U1_ENABLE:
dev->u1_enable = 0;
writel(readl(&dev->usb_ext->usbctl2) &
~BIT(U1_ENABLE),
&dev->usb_ext->usbctl2);
allow_status_338x(ep);
goto next_endpoints3;
case USB_DEVICE_U2_ENABLE:
dev->u2_enable = 0;
writel(readl(&dev->usb_ext->usbctl2) &
~BIT(U2_ENABLE),
&dev->usb_ext->usbctl2);
allow_status_338x(ep);
goto next_endpoints3;
case USB_DEVICE_LTM_ENABLE:
dev->ltm_enable = 0;
writel(readl(&dev->usb_ext->usbctl2) &
~BIT(LTM_ENABLE),
&dev->usb_ext->usbctl2);
allow_status_338x(ep);
goto next_endpoints3;
default:
break;
}
}
if (w_value == USB_DEVICE_REMOTE_WAKEUP) {
dev->wakeup_enable = 0;
writel(readl(&dev->usb->usbctl) &
~BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
&dev->usb->usbctl);
allow_status_338x(ep);
break;
}
goto usb3_delegate;
case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
e = get_ep_by_addr(dev, w_index);
if (!e)
goto do_stall3;
if (w_value != USB_ENDPOINT_HALT)
goto do_stall3;
ep_vdbg(dev, "%s clear halt\n", e->ep.name);
/*
* Workaround for SS SeqNum not cleared via
* Endpoint Halt (Clear) bit. select endpoint
*/
ep_clear_seqnum(e);
clear_halt(e);
if (!list_empty(&e->queue) && e->td_dma)
restart_dma(e);
allow_status(ep);
ep->stopped = 1;
break;
default:
goto usb3_delegate;
}
break;
case USB_REQ_SET_FEATURE:
switch (r.bRequestType) {
case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
if (!dev->addressed_state) {
switch (w_value) {
case USB_DEVICE_U1_ENABLE:
dev->u1_enable = 1;
writel(readl(&dev->usb_ext->usbctl2) |
BIT(U1_ENABLE),
&dev->usb_ext->usbctl2);
allow_status_338x(ep);
goto next_endpoints3;
case USB_DEVICE_U2_ENABLE:
dev->u2_enable = 1;
writel(readl(&dev->usb_ext->usbctl2) |
BIT(U2_ENABLE),
&dev->usb_ext->usbctl2);
allow_status_338x(ep);
goto next_endpoints3;
case USB_DEVICE_LTM_ENABLE:
dev->ltm_enable = 1;
writel(readl(&dev->usb_ext->usbctl2) |
BIT(LTM_ENABLE),
&dev->usb_ext->usbctl2);
allow_status_338x(ep);
goto next_endpoints3;
default:
break;
}
}
if (w_value == USB_DEVICE_REMOTE_WAKEUP) {
dev->wakeup_enable = 1;
writel(readl(&dev->usb->usbctl) |
BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
&dev->usb->usbctl);
allow_status_338x(ep);
break;
}
goto usb3_delegate;
case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
e = get_ep_by_addr(dev, w_index);
if (!e || (w_value != USB_ENDPOINT_HALT))
goto do_stall3;
ep->stopped = 1;
if (ep->num == 0)
ep->dev->protocol_stall = 1;
else {
if (ep->dma)
abort_dma(ep);
set_halt(ep);
}
allow_status_338x(ep);
break;
default:
goto usb3_delegate;
}
break;
default:
usb3_delegate:
ep_vdbg(dev, "setup %02x.%02x v%04x i%04x l%04x ep_cfg %08x\n",
r.bRequestType, r.bRequest,
w_value, w_index, w_length,
readl(&ep->cfg->ep_cfg));
ep->responded = 0;
spin_unlock(&dev->lock);
tmp = dev->driver->setup(&dev->gadget, &r);
spin_lock(&dev->lock);
}
do_stall3:
if (tmp < 0) {
ep_vdbg(dev, "req %02x.%02x protocol STALL; stat %d\n",
r.bRequestType, r.bRequest, tmp);
dev->protocol_stall = 1;
/* TD 9.9 Halt Endpoint test. TD 9.22 Set feature test */
set_halt(ep);
}
next_endpoints3:
#undef w_value
#undef w_index
#undef w_length
return;
}
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 &= ~BIT(INTA_ASSERTED);
if (!stat)
return;
/* ep_dbg(dev, "irqstat0 %04x\n", stat); */
/* starting a control request? */
if (unlikely(stat & BIT(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) {
u32 val = readl(&dev->usb->usbstat);
if (val & BIT(SUPER_SPEED)) {
dev->gadget.speed = USB_SPEED_SUPER;
usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
EP0_SS_MAX_PACKET_SIZE);
} else if (val & BIT(HIGH_SPEED)) {
dev->gadget.speed = USB_SPEED_HIGH;
usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
EP0_HS_MAX_PACKET_SIZE);
} else {
dev->gadget.speed = USB_SPEED_FULL;
usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
EP0_HS_MAX_PACKET_SIZE);
}
net2280_led_speed(dev, dev->gadget.speed);
ep_dbg(dev, "%s\n",
usb_speed_string(dev->gadget.speed));
}
ep = &dev->ep[0];
ep->irqs++;
/* make sure any leftover request state is cleared */
stat &= ~BIT(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 (!(dev->quirks & PLX_SUPERSPEED)) {
if (ep->dev->quirks & PLX_2280)
tmp = BIT(FIFO_OVERFLOW) |
BIT(FIFO_UNDERFLOW);
else
tmp = 0;
writel(tmp | BIT(TIMEOUT) |
BIT(USB_STALL_SENT) |
BIT(USB_IN_NAK_SENT) |
BIT(USB_IN_ACK_RCVD) |
BIT(USB_OUT_PING_NAK_SENT) |
BIT(USB_OUT_ACK_SENT) |
BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
BIT(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]);
if ((dev->quirks & PLX_SUPERSPEED) && !dev->bug7734_patched)
defect7374_workaround(dev, u.r);
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(BIT(SETUP_PACKET_INTERRUPT), &dev->regs->irqstat0);
stat ^= BIT(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 = BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
BIT(DATA_IN_TOKEN_INTERRUPT);
stop_out_naking(ep);
} else
scratch = BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
BIT(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;
if (dev->gadget.speed == USB_SPEED_SUPER) {
handle_stat0_irqs_superspeed(dev, ep, u.r);
goto next_endpoints;
}
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;
e = get_ep_by_addr(dev, w_index);
if (!e || w_length > 2)
goto do_stall;
if (readl(&e->regs->ep_rsp) & BIT(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);
ep_vdbg(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;
e = get_ep_by_addr(dev, w_index);
if (!e)
goto do_stall;
if (e->wedged) {
ep_vdbg(dev, "%s wedged, halt not cleared\n",
ep->ep.name);
} else {
ep_vdbg(dev, "%s clear halt\n", e->ep.name);
clear_halt(e);
if ((ep->dev->quirks & PLX_SUPERSPEED) &&
!list_empty(&e->queue) && e->td_dma)
restart_dma(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;
e = get_ep_by_addr(dev, w_index);
if (!e)
goto do_stall;
if (e->ep.name == ep0name)
goto do_stall;
set_halt(e);
if ((dev->quirks & PLX_SUPERSPEED) && e->dma)
abort_dma(e);
allow_status(ep);
ep_vdbg(dev, "%s set halt\n", ep->ep.name);
goto next_endpoints;
}
break;
default:
delegate:
ep_vdbg(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->cfg->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:
ep_vdbg(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 = BIT(num);
if ((scratch & t) == 0)
continue;
scratch ^= t;
ep = &dev->ep[num];
handle_ep_small(ep);
}
if (stat)
ep_dbg(dev, "unhandled irqstat0 %08x\n", stat);
}
#define DMA_INTERRUPTS (BIT(DMA_D_INTERRUPT) | \
BIT(DMA_C_INTERRUPT) | \
BIT(DMA_B_INTERRUPT) | \
BIT(DMA_A_INTERRUPT))
#define PCI_ERROR_INTERRUPTS ( \
BIT(PCI_MASTER_ABORT_RECEIVED_INTERRUPT) | \
BIT(PCI_TARGET_ABORT_RECEIVED_INTERRUPT) | \
BIT(PCI_RETRY_ABORT_INTERRUPT))
static void handle_stat1_irqs(struct net2280 *dev, u32 stat)
__releases(dev->lock)
__acquires(dev->lock)
{
struct net2280_ep *ep;
u32 tmp, num, mask, scratch;
/* after disconnect there's nothing else to do! */
tmp = BIT(VBUS_INTERRUPT) | BIT(ROOT_PORT_RESET_INTERRUPT);
mask = BIT(SUPER_SPEED) | BIT(HIGH_SPEED) | BIT(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) {
bool reset = false;
bool disconnect = false;
/*
* Ignore disconnects and resets if the speed hasn't been set.
* VBUS can bounce and there's always an initial reset.
*/
writel(tmp, &dev->regs->irqstat1);
if (dev->gadget.speed != USB_SPEED_UNKNOWN) {
if ((stat & BIT(VBUS_INTERRUPT)) &&
(readl(&dev->usb->usbctl) &
BIT(VBUS_PIN)) == 0) {
disconnect = true;
ep_dbg(dev, "disconnect %s\n",
dev->driver->driver.name);
} else if ((stat & BIT(ROOT_PORT_RESET_INTERRUPT)) &&
(readl(&dev->usb->usbstat) & mask)
== 0) {
reset = true;
ep_dbg(dev, "reset %s\n",
dev->driver->driver.name);
}
if (disconnect || reset) {
stop_activity(dev, dev->driver);
ep0_start(dev);
spin_unlock(&dev->lock);
if (reset)
usb_gadget_udc_reset
(&dev->gadget, dev->driver);
else
(dev->driver->disconnect)
(&dev->gadget);
spin_lock(&dev->lock);
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 = BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT);
if (stat & tmp) {
writel(tmp, &dev->regs->irqstat1);
if (stat & BIT(SUSPEND_REQUEST_INTERRUPT)) {
if (dev->driver->suspend)
dev->driver->suspend(&dev->gadget);
if (!enable_suspend)
stat &= ~BIT(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->quirks & PLX_2280)
stat &= ~(BIT(CONTROL_STATUS_INTERRUPT) |
BIT(SUSPEND_REQUEST_INTERRUPT) |
BIT(RESUME_INTERRUPT) |
BIT(SOF_INTERRUPT));
else
stat &= ~(BIT(CONTROL_STATUS_INTERRUPT) |
BIT(RESUME_INTERRUPT) |
BIT(SOF_DOWN_INTERRUPT) |
BIT(SOF_INTERRUPT));
if (!stat)
return;
/* ep_dbg(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 = BIT(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);
/* dma sync*/
if (dev->quirks & PLX_SUPERSPEED) {
u32 r_dmacount = readl(&dma->dmacount);
if (!ep->is_in && (r_dmacount & 0x00FFFFFF) &&
(tmp & BIT(DMA_TRANSACTION_DONE_INTERRUPT)))
continue;
}
if (!(tmp & BIT(DMA_TRANSACTION_DONE_INTERRUPT))) {
ep_dbg(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)) {
tmp = readl(&dma->dmactl);
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) {
ep_err(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)
ep_dbg(dev, "unhandled irqstat1 %08x\n", stat);
}
static irqreturn_t net2280_irq(int irq, void *_dev)
{
struct net2280 *dev = _dev;
/* shared interrupt, not ours */
if ((dev->quirks & PLX_LEGACY) &&
(!(readl(&dev->regs->irqstat0) & BIT(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));
if (dev->quirks & PLX_SUPERSPEED) {
/* re-enable interrupt to trigger any possible new interrupt */
u32 pciirqenb1 = readl(&dev->regs->pciirqenb1);
writel(pciirqenb1 & 0x7FFFFFFF, &dev->regs->pciirqenb1);
writel(pciirqenb1, &dev->regs->pciirqenb1);
}
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->quirks & PLX_SUPERSPEED)
pci_disable_msi(pdev);
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);
ep_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->quirks = id->driver_data;
dev->pdev = pdev;
dev->gadget.ops = &net2280_ops;
dev->gadget.max_speed = (dev->quirks & PLX_SUPERSPEED) ?
USB_SPEED_SUPER : 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)) {
ep_dbg(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) {
ep_dbg(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);
if (dev->quirks & PLX_SUPERSPEED) {
u32 fsmvalue;
u32 usbstat;
dev->usb_ext = (struct usb338x_usb_ext_regs __iomem *)
(base + 0x00b4);
dev->llregs = (struct usb338x_ll_regs __iomem *)
(base + 0x0700);
dev->ll_lfps_regs = (struct usb338x_ll_lfps_regs __iomem *)
(base + 0x0748);
dev->ll_tsn_regs = (struct usb338x_ll_tsn_regs __iomem *)
(base + 0x077c);
dev->ll_chicken_reg = (struct usb338x_ll_chi_regs __iomem *)
(base + 0x079c);
dev->plregs = (struct usb338x_pl_regs __iomem *)
(base + 0x0800);
usbstat = readl(&dev->usb->usbstat);
dev->enhanced_mode = !!(usbstat & BIT(11));
dev->n_ep = (dev->enhanced_mode) ? 9 : 5;
/* put into initial config, link up all endpoints */
fsmvalue = get_idx_reg(dev->regs, SCRATCH) &
(0xf << DEFECT7374_FSM_FIELD);
/* See if firmware needs to set up for workaround: */
if (fsmvalue == DEFECT7374_FSM_SS_CONTROL_READ) {
dev->bug7734_patched = 1;
writel(0, &dev->usb->usbctl);
} else
dev->bug7734_patched = 0;
} else {
dev->enhanced_mode = 0;
dev->n_ep = 7;
/* 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) {
ep_err(dev, "No IRQ. Check PCI setup!\n");
retval = -ENODEV;
goto done;
}
if (dev->quirks & PLX_SUPERSPEED)
if (pci_enable_msi(pdev))
ep_err(dev, "Failed to enable MSI mode\n");
if (request_irq(pdev->irq, net2280_irq, IRQF_SHARED,
driver_name, dev)) {
ep_err(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) {
ep_dbg(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) {
ep_dbg(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 */
if (dev->quirks & PLX_LEGACY)
writel(BIT(DMA_MEMORY_WRITE_AND_INVALIDATE_ENABLE) |
/*
* 256 write retries may not be enough...
BIT(PCI_RETRY_ABORT_ENABLE) |
*/
BIT(DMA_READ_MULTIPLE_ENABLE) |
BIT(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 */
ep_info(dev, "%s\n", driver_desc);
ep_info(dev, "irq %d, pci mem %p, chip rev %04x\n",
pdev->irq, base, dev->chiprev);
ep_info(dev, "version: " DRIVER_VERSION "; %s\n",
dev->enhanced_mode ? "enhanced mode" : "legacy mode");
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);
}
/*-------------------------------------------------------------------------*/
static const struct pci_device_id pci_ids[] = { {
.class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
.class_mask = ~0,
.vendor = PCI_VENDOR_ID_PLX_LEGACY,
.device = 0x2280,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
.driver_data = PLX_LEGACY | PLX_2280,
}, {
.class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
.class_mask = ~0,
.vendor = PCI_VENDOR_ID_PLX_LEGACY,
.device = 0x2282,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
.driver_data = PLX_LEGACY,
},
{
.class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
.class_mask = ~0,
.vendor = PCI_VENDOR_ID_PLX,
.device = 0x3380,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
.driver_data = PLX_SUPERSPEED,
},
{
.class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
.class_mask = ~0,
.vendor = PCI_VENDOR_ID_PLX,
.device = 0x3382,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
.driver_data = PLX_SUPERSPEED,
},
{ /* 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_pci_driver(net2280_pci_driver);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_AUTHOR("David Brownell");
MODULE_LICENSE("GPL");
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