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ar5523.c
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ar5523.c
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/*
* Copyright (c) 2006 Damien Bergamini <[email protected]>
* Copyright (c) 2006 Sam Leffler, Errno Consulting
* Copyright (c) 2007 Christoph Hellwig <[email protected]>
* Copyright (c) 2008-2009 Weongyo Jeong <[email protected]>
* Copyright (c) 2012 Pontus Fuchs <[email protected]>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* This driver is based on the uath driver written by Damien Bergamini for
* OpenBSD, who did black-box analysis of the Windows binary driver to find
* out how the hardware works. It contains a lot magic numbers because of
* that and only has minimal functionality.
*/
#include <linux/compiler.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/list.h>
#include <linux/completion.h>
#include <linux/firmware.h>
#include <linux/skbuff.h>
#include <linux/usb.h>
#include <net/mac80211.h>
#include "ar5523.h"
#include "ar5523_hw.h"
/*
* Various supported device vendors/products.
* UB51: AR5005UG 802.11b/g, UB52: AR5005UX 802.11a/b/g
*/
static int ar5523_submit_rx_cmd(struct ar5523 *ar);
static void ar5523_data_tx_pkt_put(struct ar5523 *ar);
static void ar5523_read_reply(struct ar5523 *ar, struct ar5523_cmd_hdr *hdr,
struct ar5523_tx_cmd *cmd)
{
int dlen, olen;
u32 *rp;
dlen = hdr->len - sizeof(*hdr);
if (dlen < 0) {
WARN_ON(1);
goto out;
}
ar5523_dbg(ar, "Code = %d len = %d\n", hdr->code & 0xff, dlen);
rp = (u32 *)(hdr + 1);
if (dlen >= sizeof(u32)) {
olen = be32_to_cpu(rp[0]);
dlen -= sizeof(u32);
if (olen == 0) {
/* convention is 0 =>'s one word */
olen = sizeof(u32);
}
} else
olen = 0;
if (cmd->odata) {
if (cmd->olen < olen) {
ar5523_err(ar, "olen to small %d < %d\n",
cmd->olen, olen);
cmd->olen = 0;
cmd->res = -EOVERFLOW;
} else {
cmd->olen = olen;
memcpy(cmd->odata, &rp[1], olen);
cmd->res = 0;
}
}
out:
complete(&cmd->done);
}
static void ar5523_cmd_rx_cb(struct urb *urb)
{
struct ar5523 *ar = urb->context;
struct ar5523_tx_cmd *cmd = &ar->tx_cmd;
struct ar5523_cmd_hdr *hdr = ar->rx_cmd_buf;
int dlen;
if (urb->status) {
if (urb->status != -ESHUTDOWN)
ar5523_err(ar, "RX USB error %d.\n", urb->status);
goto skip;
}
if (urb->actual_length < sizeof(struct ar5523_cmd_hdr)) {
ar5523_err(ar, "RX USB to short.\n");
goto skip;
}
ar5523_dbg(ar, "%s code %02x priv %d\n", __func__,
be32_to_cpu(hdr->code) & 0xff, hdr->priv);
hdr->code = be32_to_cpu(hdr->code);
hdr->len = be32_to_cpu(hdr->len);
switch (hdr->code & 0xff) {
default:
/* reply to a read command */
if (hdr->priv != AR5523_CMD_ID) {
ar5523_err(ar, "Unexpected command id: %02x\n",
hdr->code & 0xff);
goto skip;
}
ar5523_read_reply(ar, hdr, cmd);
break;
case WDCMSG_DEVICE_AVAIL:
ar5523_dbg(ar, "WDCMSG_DEVICE_AVAIL\n");
cmd->res = 0;
cmd->olen = 0;
complete(&cmd->done);
break;
case WDCMSG_SEND_COMPLETE:
ar5523_dbg(ar, "WDCMSG_SEND_COMPLETE: %d pending\n",
atomic_read(&ar->tx_nr_pending));
if (!test_bit(AR5523_HW_UP, &ar->flags))
ar5523_dbg(ar, "Unexpected WDCMSG_SEND_COMPLETE\n");
else {
mod_timer(&ar->tx_wd_timer,
jiffies + AR5523_TX_WD_TIMEOUT);
ar5523_data_tx_pkt_put(ar);
}
break;
case WDCMSG_TARGET_START:
/* This command returns a bogus id so it needs special
handling */
dlen = hdr->len - sizeof(*hdr);
if (dlen != (int)sizeof(u32)) {
ar5523_err(ar, "Invalid reply to WDCMSG_TARGET_START");
return;
}
memcpy(cmd->odata, hdr + 1, sizeof(u32));
cmd->olen = sizeof(u32);
cmd->res = 0;
complete(&cmd->done);
break;
case WDCMSG_STATS_UPDATE:
ar5523_dbg(ar, "WDCMSG_STATS_UPDATE\n");
break;
}
skip:
ar5523_submit_rx_cmd(ar);
}
static int ar5523_alloc_rx_cmd(struct ar5523 *ar)
{
ar->rx_cmd_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!ar->rx_cmd_urb)
return -ENOMEM;
ar->rx_cmd_buf = usb_alloc_coherent(ar->dev, AR5523_MAX_RXCMDSZ,
GFP_KERNEL,
&ar->rx_cmd_urb->transfer_dma);
if (!ar->rx_cmd_buf) {
usb_free_urb(ar->rx_cmd_urb);
return -ENOMEM;
}
return 0;
}
static void ar5523_cancel_rx_cmd(struct ar5523 *ar)
{
usb_kill_urb(ar->rx_cmd_urb);
}
static void ar5523_free_rx_cmd(struct ar5523 *ar)
{
usb_free_coherent(ar->dev, AR5523_MAX_RXCMDSZ,
ar->rx_cmd_buf, ar->rx_cmd_urb->transfer_dma);
usb_free_urb(ar->rx_cmd_urb);
}
static int ar5523_submit_rx_cmd(struct ar5523 *ar)
{
int error;
usb_fill_bulk_urb(ar->rx_cmd_urb, ar->dev,
ar5523_cmd_rx_pipe(ar->dev), ar->rx_cmd_buf,
AR5523_MAX_RXCMDSZ, ar5523_cmd_rx_cb, ar);
ar->rx_cmd_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
error = usb_submit_urb(ar->rx_cmd_urb, GFP_ATOMIC);
if (error) {
if (error != -ENODEV)
ar5523_err(ar, "error %d when submitting rx urb\n",
error);
return error;
}
return 0;
}
/*
* Command submitted cb
*/
static void ar5523_cmd_tx_cb(struct urb *urb)
{
struct ar5523_tx_cmd *cmd = urb->context;
struct ar5523 *ar = cmd->ar;
if (urb->status) {
ar5523_err(ar, "Failed to TX command. Status = %d\n",
urb->status);
cmd->res = urb->status;
complete(&cmd->done);
return;
}
if (!(cmd->flags & AR5523_CMD_FLAG_READ)) {
cmd->res = 0;
complete(&cmd->done);
}
}
static int ar5523_cmd(struct ar5523 *ar, u32 code, const void *idata,
int ilen, void *odata, int olen, int flags)
{
struct ar5523_cmd_hdr *hdr;
struct ar5523_tx_cmd *cmd = &ar->tx_cmd;
int xferlen, error;
/* always bulk-out a multiple of 4 bytes */
xferlen = (sizeof(struct ar5523_cmd_hdr) + ilen + 3) & ~3;
hdr = (struct ar5523_cmd_hdr *)cmd->buf_tx;
memset(hdr, 0, sizeof(struct ar5523_cmd_hdr));
hdr->len = cpu_to_be32(xferlen);
hdr->code = cpu_to_be32(code);
hdr->priv = AR5523_CMD_ID;
if (flags & AR5523_CMD_FLAG_MAGIC)
hdr->magic = cpu_to_be32(1 << 24);
memcpy(hdr + 1, idata, ilen);
cmd->odata = odata;
cmd->olen = olen;
cmd->flags = flags;
ar5523_dbg(ar, "do cmd %02x\n", code);
usb_fill_bulk_urb(cmd->urb_tx, ar->dev, ar5523_cmd_tx_pipe(ar->dev),
cmd->buf_tx, xferlen, ar5523_cmd_tx_cb, cmd);
cmd->urb_tx->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
error = usb_submit_urb(cmd->urb_tx, GFP_KERNEL);
if (error) {
ar5523_err(ar, "could not send command 0x%x, error=%d\n",
code, error);
return error;
}
if (!wait_for_completion_timeout(&cmd->done, 2 * HZ)) {
cmd->odata = NULL;
ar5523_err(ar, "timeout waiting for command %02x reply\n",
code);
cmd->res = -ETIMEDOUT;
}
return cmd->res;
}
static int ar5523_cmd_write(struct ar5523 *ar, u32 code, const void *data,
int len, int flags)
{
flags &= ~AR5523_CMD_FLAG_READ;
return ar5523_cmd(ar, code, data, len, NULL, 0, flags);
}
static int ar5523_cmd_read(struct ar5523 *ar, u32 code, const void *idata,
int ilen, void *odata, int olen, int flags)
{
flags |= AR5523_CMD_FLAG_READ;
return ar5523_cmd(ar, code, idata, ilen, odata, olen, flags);
}
static int ar5523_config(struct ar5523 *ar, u32 reg, u32 val)
{
struct ar5523_write_mac write;
int error;
write.reg = cpu_to_be32(reg);
write.len = cpu_to_be32(0); /* 0 = single write */
*(u32 *)write.data = cpu_to_be32(val);
error = ar5523_cmd_write(ar, WDCMSG_TARGET_SET_CONFIG, &write,
3 * sizeof(u32), 0);
if (error != 0)
ar5523_err(ar, "could not write register 0x%02x\n", reg);
return error;
}
static int ar5523_config_multi(struct ar5523 *ar, u32 reg, const void *data,
int len)
{
struct ar5523_write_mac write;
int error;
write.reg = cpu_to_be32(reg);
write.len = cpu_to_be32(len);
memcpy(write.data, data, len);
/* properly handle the case where len is zero (reset) */
error = ar5523_cmd_write(ar, WDCMSG_TARGET_SET_CONFIG, &write,
(len == 0) ? sizeof(u32) : 2 * sizeof(u32) + len, 0);
if (error != 0)
ar5523_err(ar, "could not write %d bytes to register 0x%02x\n",
len, reg);
return error;
}
static int ar5523_get_status(struct ar5523 *ar, u32 which, void *odata,
int olen)
{
int error;
which = cpu_to_be32(which);
error = ar5523_cmd_read(ar, WDCMSG_TARGET_GET_STATUS,
&which, sizeof(which), odata, olen, AR5523_CMD_FLAG_MAGIC);
if (error != 0)
ar5523_err(ar, "could not read EEPROM offset 0x%02x\n",
be32_to_cpu(which));
return error;
}
static int ar5523_get_capability(struct ar5523 *ar, u32 cap, u32 *val)
{
int error;
cap = cpu_to_be32(cap);
error = ar5523_cmd_read(ar, WDCMSG_TARGET_GET_CAPABILITY,
&cap, sizeof(cap), val, sizeof(u32), AR5523_CMD_FLAG_MAGIC);
if (error != 0) {
ar5523_err(ar, "could not read capability %u\n",
be32_to_cpu(cap));
return error;
}
*val = be32_to_cpu(*val);
return error;
}
static int ar5523_get_devcap(struct ar5523 *ar)
{
#define GETCAP(x) do { \
error = ar5523_get_capability(ar, x, &cap); \
if (error != 0) \
return error; \
ar5523_info(ar, "Cap: " \
"%s=0x%08x\n", #x, cap); \
} while (0)
int error;
u32 cap;
/* collect device capabilities */
GETCAP(CAP_TARGET_VERSION);
GETCAP(CAP_TARGET_REVISION);
GETCAP(CAP_MAC_VERSION);
GETCAP(CAP_MAC_REVISION);
GETCAP(CAP_PHY_REVISION);
GETCAP(CAP_ANALOG_5GHz_REVISION);
GETCAP(CAP_ANALOG_2GHz_REVISION);
GETCAP(CAP_REG_DOMAIN);
GETCAP(CAP_REG_CAP_BITS);
GETCAP(CAP_WIRELESS_MODES);
GETCAP(CAP_CHAN_SPREAD_SUPPORT);
GETCAP(CAP_COMPRESS_SUPPORT);
GETCAP(CAP_BURST_SUPPORT);
GETCAP(CAP_FAST_FRAMES_SUPPORT);
GETCAP(CAP_CHAP_TUNING_SUPPORT);
GETCAP(CAP_TURBOG_SUPPORT);
GETCAP(CAP_TURBO_PRIME_SUPPORT);
GETCAP(CAP_DEVICE_TYPE);
GETCAP(CAP_WME_SUPPORT);
GETCAP(CAP_TOTAL_QUEUES);
GETCAP(CAP_CONNECTION_ID_MAX);
GETCAP(CAP_LOW_5GHZ_CHAN);
GETCAP(CAP_HIGH_5GHZ_CHAN);
GETCAP(CAP_LOW_2GHZ_CHAN);
GETCAP(CAP_HIGH_2GHZ_CHAN);
GETCAP(CAP_TWICE_ANTENNAGAIN_5G);
GETCAP(CAP_TWICE_ANTENNAGAIN_2G);
GETCAP(CAP_CIPHER_AES_CCM);
GETCAP(CAP_CIPHER_TKIP);
GETCAP(CAP_MIC_TKIP);
return 0;
}
static int ar5523_set_ledsteady(struct ar5523 *ar, int lednum, int ledmode)
{
struct ar5523_cmd_ledsteady led;
led.lednum = cpu_to_be32(lednum);
led.ledmode = cpu_to_be32(ledmode);
ar5523_dbg(ar, "set %s led %s (steady)\n",
(lednum == UATH_LED_LINK) ? "link" : "activity",
ledmode ? "on" : "off");
return ar5523_cmd_write(ar, WDCMSG_SET_LED_STEADY, &led, sizeof(led),
0);
}
static int ar5523_set_rxfilter(struct ar5523 *ar, u32 bits, u32 op)
{
struct ar5523_cmd_rx_filter rxfilter;
rxfilter.bits = cpu_to_be32(bits);
rxfilter.op = cpu_to_be32(op);
ar5523_dbg(ar, "setting Rx filter=0x%x flags=0x%x\n", bits, op);
return ar5523_cmd_write(ar, WDCMSG_RX_FILTER, &rxfilter,
sizeof(rxfilter), 0);
}
static int ar5523_reset_tx_queues(struct ar5523 *ar)
{
__be32 qid = cpu_to_be32(0);
ar5523_dbg(ar, "resetting Tx queue\n");
return ar5523_cmd_write(ar, WDCMSG_RELEASE_TX_QUEUE,
&qid, sizeof(qid), 0);
}
static int ar5523_set_chan(struct ar5523 *ar)
{
struct ieee80211_conf *conf = &ar->hw->conf;
struct ar5523_cmd_reset reset;
memset(&reset, 0, sizeof(reset));
reset.flags |= cpu_to_be32(UATH_CHAN_2GHZ);
reset.flags |= cpu_to_be32(UATH_CHAN_OFDM);
reset.freq = cpu_to_be32(conf->channel->center_freq);
reset.maxrdpower = cpu_to_be32(50); /* XXX */
reset.channelchange = cpu_to_be32(1);
reset.keeprccontent = cpu_to_be32(0);
ar5523_dbg(ar, "set chan flags 0x%x freq %d\n",
be32_to_cpu(reset.flags),
conf->channel->center_freq);
return ar5523_cmd_write(ar, WDCMSG_RESET, &reset, sizeof(reset), 0);
}
static int ar5523_queue_init(struct ar5523 *ar)
{
struct ar5523_cmd_txq_setup qinfo;
ar5523_dbg(ar, "setting up Tx queue\n");
qinfo.qid = cpu_to_be32(0);
qinfo.len = cpu_to_be32(sizeof(qinfo.attr));
qinfo.attr.priority = cpu_to_be32(0); /* XXX */
qinfo.attr.aifs = cpu_to_be32(3);
qinfo.attr.logcwmin = cpu_to_be32(4);
qinfo.attr.logcwmax = cpu_to_be32(10);
qinfo.attr.bursttime = cpu_to_be32(0);
qinfo.attr.mode = cpu_to_be32(0);
qinfo.attr.qflags = cpu_to_be32(1); /* XXX? */
return ar5523_cmd_write(ar, WDCMSG_SETUP_TX_QUEUE, &qinfo,
sizeof(qinfo), 0);
}
static int ar5523_switch_chan(struct ar5523 *ar)
{
int error;
error = ar5523_set_chan(ar);
if (error) {
ar5523_err(ar, "could not set chan, error %d\n", error);
goto out_err;
}
/* reset Tx rings */
error = ar5523_reset_tx_queues(ar);
if (error) {
ar5523_err(ar, "could not reset Tx queues, error %d\n",
error);
goto out_err;
}
/* set Tx rings WME properties */
error = ar5523_queue_init(ar);
if (error)
ar5523_err(ar, "could not init wme, error %d\n", error);
out_err:
return error;
}
static void ar5523_rx_data_put(struct ar5523 *ar,
struct ar5523_rx_data *data)
{
unsigned long flags;
spin_lock_irqsave(&ar->rx_data_list_lock, flags);
list_move(&data->list, &ar->rx_data_free);
spin_unlock_irqrestore(&ar->rx_data_list_lock, flags);
}
static void ar5523_data_rx_cb(struct urb *urb)
{
struct ar5523_rx_data *data = urb->context;
struct ar5523 *ar = data->ar;
struct ar5523_rx_desc *desc;
struct ar5523_chunk *chunk;
struct ieee80211_hw *hw = ar->hw;
struct ieee80211_rx_status *rx_status;
u32 rxlen;
int usblen = urb->actual_length;
int hdrlen, pad;
ar5523_dbg(ar, "%s\n", __func__);
/* sync/async unlink faults aren't errors */
if (urb->status) {
if (urb->status != -ESHUTDOWN)
ar5523_err(ar, "%s: USB err: %d\n", __func__,
urb->status);
goto skip;
}
if (usblen < AR5523_MIN_RXBUFSZ) {
ar5523_err(ar, "RX: wrong xfer size (usblen=%d)\n", usblen);
goto skip;
}
chunk = (struct ar5523_chunk *) data->skb->data;
if (((chunk->flags & UATH_CFLAGS_FINAL) == 0) ||
chunk->seqnum != 0) {
ar5523_dbg(ar, "RX: No final flag. s: %d f: %02x l: %d\n",
chunk->seqnum, chunk->flags,
be16_to_cpu(chunk->length));
goto skip;
}
/* Rx descriptor is located at the end, 32-bit aligned */
desc = (struct ar5523_rx_desc *)
(data->skb->data + usblen - sizeof(struct ar5523_rx_desc));
rxlen = be32_to_cpu(desc->len);
if (rxlen > ar->rxbufsz) {
ar5523_dbg(ar, "RX: Bad descriptor (len=%d)\n",
be32_to_cpu(desc->len));
goto skip;
}
if (!rxlen) {
ar5523_dbg(ar, "RX: rxlen is 0\n");
goto skip;
}
if (be32_to_cpu(desc->status) != 0) {
ar5523_dbg(ar, "Bad RX status (0x%x len = %d). Skip\n",
be32_to_cpu(desc->status), be32_to_cpu(desc->len));
goto skip;
}
skb_reserve(data->skb, sizeof(*chunk));
skb_put(data->skb, rxlen - sizeof(struct ar5523_rx_desc));
hdrlen = ieee80211_get_hdrlen_from_skb(data->skb);
if (!IS_ALIGNED(hdrlen, 4)) {
ar5523_dbg(ar, "eek, alignment workaround activated\n");
pad = ALIGN(hdrlen, 4) - hdrlen;
memmove(data->skb->data + pad, data->skb->data, hdrlen);
skb_pull(data->skb, pad);
skb_put(data->skb, pad);
}
rx_status = IEEE80211_SKB_RXCB(data->skb);
memset(rx_status, 0, sizeof(*rx_status));
rx_status->freq = be32_to_cpu(desc->channel);
rx_status->band = hw->conf.channel->band;
rx_status->signal = -95 + be32_to_cpu(desc->rssi);
ieee80211_rx_irqsafe(hw, data->skb);
data->skb = NULL;
skip:
if (data->skb) {
dev_kfree_skb_irq(data->skb);
data->skb = NULL;
}
ar5523_rx_data_put(ar, data);
if (atomic_inc_return(&ar->rx_data_free_cnt) >=
AR5523_RX_DATA_REFILL_COUNT &&
test_bit(AR5523_HW_UP, &ar->flags))
queue_work(ar->wq, &ar->rx_refill_work);
}
static void ar5523_rx_refill_work(struct work_struct *work)
{
struct ar5523 *ar = container_of(work, struct ar5523, rx_refill_work);
struct ar5523_rx_data *data;
unsigned long flags;
int error;
ar5523_dbg(ar, "%s\n", __func__);
do {
spin_lock_irqsave(&ar->rx_data_list_lock, flags);
if (!list_empty(&ar->rx_data_free))
data = (struct ar5523_rx_data *) ar->rx_data_free.next;
else
data = NULL;
spin_unlock_irqrestore(&ar->rx_data_list_lock, flags);
if (!data)
goto done;
data->skb = alloc_skb(ar->rxbufsz, GFP_KERNEL);
if (!data->skb) {
ar5523_err(ar, "could not allocate rx skbuff\n");
return;
}
usb_fill_bulk_urb(data->urb, ar->dev,
ar5523_data_rx_pipe(ar->dev), data->skb->data,
ar->rxbufsz, ar5523_data_rx_cb, data);
spin_lock_irqsave(&ar->rx_data_list_lock, flags);
list_move(&data->list, &ar->rx_data_used);
spin_unlock_irqrestore(&ar->rx_data_list_lock, flags);
atomic_dec(&ar->rx_data_free_cnt);
error = usb_submit_urb(data->urb, GFP_KERNEL);
if (error) {
kfree_skb(data->skb);
if (error != -ENODEV)
ar5523_err(ar, "Err sending rx data urb %d\n",
error);
ar5523_rx_data_put(ar, data);
atomic_inc(&ar->rx_data_free_cnt);
return;
}
} while (true);
done:
return;
}
static void ar5523_cancel_rx_bufs(struct ar5523 *ar)
{
struct ar5523_rx_data *data;
unsigned long flags;
do {
spin_lock_irqsave(&ar->rx_data_list_lock, flags);
if (!list_empty(&ar->rx_data_used))
data = (struct ar5523_rx_data *) ar->rx_data_used.next;
else
data = NULL;
spin_unlock_irqrestore(&ar->rx_data_list_lock, flags);
if (!data)
break;
usb_kill_urb(data->urb);
list_move(&data->list, &ar->rx_data_free);
atomic_inc(&ar->rx_data_free_cnt);
} while (data);
}
static void ar5523_free_rx_bufs(struct ar5523 *ar)
{
struct ar5523_rx_data *data;
ar5523_cancel_rx_bufs(ar);
while (!list_empty(&ar->rx_data_free)) {
data = (struct ar5523_rx_data *) ar->rx_data_free.next;
list_del(&data->list);
usb_free_urb(data->urb);
}
}
static int ar5523_alloc_rx_bufs(struct ar5523 *ar)
{
int i;
for (i = 0; i < AR5523_RX_DATA_COUNT; i++) {
struct ar5523_rx_data *data = &ar->rx_data[i];
data->ar = ar;
data->urb = usb_alloc_urb(0, GFP_KERNEL);
if (!data->urb) {
ar5523_err(ar, "could not allocate rx data urb\n");
goto err;
}
list_add_tail(&data->list, &ar->rx_data_free);
atomic_inc(&ar->rx_data_free_cnt);
}
return 0;
err:
ar5523_free_rx_bufs(ar);
return -ENOMEM;
}
static void ar5523_data_tx_pkt_put(struct ar5523 *ar)
{
atomic_dec(&ar->tx_nr_total);
if (!atomic_dec_return(&ar->tx_nr_pending)) {
del_timer(&ar->tx_wd_timer);
wake_up(&ar->tx_flush_waitq);
}
if (atomic_read(&ar->tx_nr_total) < AR5523_TX_DATA_RESTART_COUNT) {
ar5523_dbg(ar, "restart tx queue\n");
ieee80211_wake_queues(ar->hw);
}
}
static void ar5523_data_tx_cb(struct urb *urb)
{
struct sk_buff *skb = urb->context;
struct ieee80211_tx_info *txi = IEEE80211_SKB_CB(skb);
struct ar5523_tx_data *data = (struct ar5523_tx_data *)
txi->driver_data;
struct ar5523 *ar = data->ar;
unsigned long flags;
ar5523_dbg(ar, "data tx urb completed: %d\n", urb->status);
spin_lock_irqsave(&ar->tx_data_list_lock, flags);
list_del(&data->list);
spin_unlock_irqrestore(&ar->tx_data_list_lock, flags);
if (urb->status) {
ar5523_dbg(ar, "%s: urb status: %d\n", __func__, urb->status);
ar5523_data_tx_pkt_put(ar);
ieee80211_free_txskb(ar->hw, skb);
} else {
skb_pull(skb, sizeof(struct ar5523_tx_desc) + sizeof(__be32));
ieee80211_tx_status_irqsafe(ar->hw, skb);
}
usb_free_urb(urb);
}
static void ar5523_tx(struct ieee80211_hw *hw,
struct ieee80211_tx_control *control,
struct sk_buff *skb)
{
struct ieee80211_tx_info *txi = IEEE80211_SKB_CB(skb);
struct ar5523_tx_data *data = (struct ar5523_tx_data *)
txi->driver_data;
struct ar5523 *ar = hw->priv;
unsigned long flags;
ar5523_dbg(ar, "tx called\n");
if (atomic_inc_return(&ar->tx_nr_total) >= AR5523_TX_DATA_COUNT) {
ar5523_dbg(ar, "tx queue full\n");
ar5523_dbg(ar, "stop queues (tot %d pend %d)\n",
atomic_read(&ar->tx_nr_total),
atomic_read(&ar->tx_nr_pending));
ieee80211_stop_queues(hw);
}
data->skb = skb;
spin_lock_irqsave(&ar->tx_data_list_lock, flags);
list_add_tail(&data->list, &ar->tx_queue_pending);
spin_unlock_irqrestore(&ar->tx_data_list_lock, flags);
ieee80211_queue_work(ar->hw, &ar->tx_work);
}
static void ar5523_tx_work_locked(struct ar5523 *ar)
{
struct ar5523_tx_data *data;
struct ar5523_tx_desc *desc;
struct ar5523_chunk *chunk;
struct ieee80211_tx_info *txi;
struct urb *urb;
struct sk_buff *skb;
int error = 0, paylen;
u32 txqid;
unsigned long flags;
BUILD_BUG_ON(sizeof(struct ar5523_tx_data) >
IEEE80211_TX_INFO_DRIVER_DATA_SIZE);
ar5523_dbg(ar, "%s\n", __func__);
do {
spin_lock_irqsave(&ar->tx_data_list_lock, flags);
if (!list_empty(&ar->tx_queue_pending)) {
data = (struct ar5523_tx_data *)
ar->tx_queue_pending.next;
list_del(&data->list);
} else
data = NULL;
spin_unlock_irqrestore(&ar->tx_data_list_lock, flags);
if (!data)
break;
skb = data->skb;
txqid = 0;
txi = IEEE80211_SKB_CB(skb);
paylen = skb->len;
urb = usb_alloc_urb(0, GFP_KERNEL);
if (!urb) {
ar5523_err(ar, "Failed to allocate TX urb\n");
ieee80211_free_txskb(ar->hw, skb);
continue;
}
data->ar = ar;
data->urb = urb;
desc = (struct ar5523_tx_desc *)skb_push(skb, sizeof(*desc));
chunk = (struct ar5523_chunk *)skb_push(skb, sizeof(*chunk));
chunk->seqnum = 0;
chunk->flags = UATH_CFLAGS_FINAL;
chunk->length = cpu_to_be16(skb->len);
desc->msglen = cpu_to_be32(skb->len);
desc->msgid = AR5523_DATA_ID;
desc->buflen = cpu_to_be32(paylen);
desc->type = cpu_to_be32(WDCMSG_SEND);
desc->flags = cpu_to_be32(UATH_TX_NOTIFY);
if (test_bit(AR5523_CONNECTED, &ar->flags))
desc->connid = cpu_to_be32(AR5523_ID_BSS);
else
desc->connid = cpu_to_be32(AR5523_ID_BROADCAST);
if (txi->flags & IEEE80211_TX_CTL_USE_MINRATE)
txqid |= UATH_TXQID_MINRATE;
desc->txqid = cpu_to_be32(txqid);
urb->transfer_flags = URB_ZERO_PACKET;
usb_fill_bulk_urb(urb, ar->dev, ar5523_data_tx_pipe(ar->dev),
skb->data, skb->len, ar5523_data_tx_cb, skb);
spin_lock_irqsave(&ar->tx_data_list_lock, flags);
list_add_tail(&data->list, &ar->tx_queue_submitted);
spin_unlock_irqrestore(&ar->tx_data_list_lock, flags);
mod_timer(&ar->tx_wd_timer, jiffies + AR5523_TX_WD_TIMEOUT);
atomic_inc(&ar->tx_nr_pending);
ar5523_dbg(ar, "TX Frame (%d pending)\n",
atomic_read(&ar->tx_nr_pending));
error = usb_submit_urb(urb, GFP_KERNEL);
if (error) {
ar5523_err(ar, "error %d when submitting tx urb\n",
error);
spin_lock_irqsave(&ar->tx_data_list_lock, flags);
list_del(&data->list);
spin_unlock_irqrestore(&ar->tx_data_list_lock, flags);
atomic_dec(&ar->tx_nr_pending);
ar5523_data_tx_pkt_put(ar);
usb_free_urb(urb);
ieee80211_free_txskb(ar->hw, skb);
}
} while (true);
}
static void ar5523_tx_work(struct work_struct *work)
{
struct ar5523 *ar = container_of(work, struct ar5523, tx_work);
ar5523_dbg(ar, "%s\n", __func__);
mutex_lock(&ar->mutex);
ar5523_tx_work_locked(ar);
mutex_unlock(&ar->mutex);
}
static void ar5523_tx_wd_timer(unsigned long arg)
{
struct ar5523 *ar = (struct ar5523 *) arg;
ar5523_dbg(ar, "TX watchdog timer triggered\n");
ieee80211_queue_work(ar->hw, &ar->tx_wd_work);
}
static void ar5523_tx_wd_work(struct work_struct *work)
{
struct ar5523 *ar = container_of(work, struct ar5523, tx_wd_work);
/* Occasionally the TX queues stop responding. The only way to
* recover seems to be to reset the dongle.
*/
mutex_lock(&ar->mutex);
ar5523_err(ar, "TX queue stuck (tot %d pend %d)\n",
atomic_read(&ar->tx_nr_total),
atomic_read(&ar->tx_nr_pending));
ar5523_err(ar, "Will restart dongle.\n");
ar5523_cmd_write(ar, WDCMSG_TARGET_RESET, NULL, 0, 0);
mutex_unlock(&ar->mutex);
}
static void ar5523_flush_tx(struct ar5523 *ar)
{
ar5523_tx_work_locked(ar);
/* Don't waste time trying to flush if USB is disconnected */
if (test_bit(AR5523_USB_DISCONNECTED, &ar->flags))
return;
if (!wait_event_timeout(ar->tx_flush_waitq,
!atomic_read(&ar->tx_nr_pending), AR5523_FLUSH_TIMEOUT))
ar5523_err(ar, "flush timeout (tot %d pend %d)\n",
atomic_read(&ar->tx_nr_total),
atomic_read(&ar->tx_nr_pending));
}
static void ar5523_free_tx_cmd(struct ar5523 *ar)
{
struct ar5523_tx_cmd *cmd = &ar->tx_cmd;
usb_free_coherent(ar->dev, AR5523_MAX_RXCMDSZ, cmd->buf_tx,
cmd->urb_tx->transfer_dma);
usb_free_urb(cmd->urb_tx);
}
static int ar5523_alloc_tx_cmd(struct ar5523 *ar)
{
struct ar5523_tx_cmd *cmd = &ar->tx_cmd;
cmd->ar = ar;
init_completion(&cmd->done);
cmd->urb_tx = usb_alloc_urb(0, GFP_KERNEL);
if (!cmd->urb_tx) {
ar5523_err(ar, "could not allocate urb\n");
return -ENOMEM;
}
cmd->buf_tx = usb_alloc_coherent(ar->dev, AR5523_MAX_TXCMDSZ,
GFP_KERNEL,
&cmd->urb_tx->transfer_dma);
if (!cmd->buf_tx) {
usb_free_urb(cmd->urb_tx);
return -ENOMEM;
}
return 0;
}
/*
* This function is called periodically (every second) when associated to
* query device statistics.
*/
static void ar5523_stat_work(struct work_struct *work)
{
struct ar5523 *ar = container_of(work, struct ar5523, stat_work.work);
int error;
ar5523_dbg(ar, "%s\n", __func__);
mutex_lock(&ar->mutex);
/*
* Send request for statistics asynchronously once a second. This
* seems to be important. Throughput is a lot better if this is done.
*/
error = ar5523_cmd_write(ar, WDCMSG_TARGET_GET_STATS, NULL, 0, 0);
if (error)
ar5523_err(ar, "could not query stats, error %d\n", error);
mutex_unlock(&ar->mutex);
ieee80211_queue_delayed_work(ar->hw, &ar->stat_work, HZ);
}
/*
* Interface routines to the mac80211 stack.
*/
static int ar5523_start(struct ieee80211_hw *hw)
{
struct ar5523 *ar = hw->priv;
int error;
__be32 val;
ar5523_dbg(ar, "start called\n");
mutex_lock(&ar->mutex);
val = cpu_to_be32(0);
ar5523_cmd_write(ar, WDCMSG_BIND, &val, sizeof(val), 0);