linux/drivers/net/wireless/rt2x00/rt2x00pci.c
Ivo van Doorn 1230cb83f4 rt2x00: Always call ieee80211_stop_queue() when return NETDEV_TX_BUSY
Apparently it was possible that ieee80211_stop_queue() was not full while
NETDEV_TX_BUSY was being reported back. I think that is what causing the WARN_ON().
This moves all calls to ieee80211_stop_queue() in rt2x00mac.c where it is easier
to determine if the queue should be halted.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2008-01-28 15:09:22 -08:00

534 lines
12 KiB
C

/*
Copyright (C) 2004 - 2007 rt2x00 SourceForge Project
<http://rt2x00.serialmonkey.com>
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.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the
Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/*
Module: rt2x00pci
Abstract: rt2x00 generic pci device routines.
*/
#include <linux/dma-mapping.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include "rt2x00.h"
#include "rt2x00pci.h"
/*
* Beacon handlers.
*/
int rt2x00pci_beacon_update(struct ieee80211_hw *hw, struct sk_buff *skb,
struct ieee80211_tx_control *control)
{
struct rt2x00_dev *rt2x00dev = hw->priv;
struct skb_desc *desc;
struct data_ring *ring;
struct data_entry *entry;
/*
* Just in case mac80211 doesn't set this correctly,
* but we need this queue set for the descriptor
* initialization.
*/
control->queue = IEEE80211_TX_QUEUE_BEACON;
ring = rt2x00lib_get_ring(rt2x00dev, control->queue);
entry = rt2x00_get_data_entry(ring);
/*
* Fill in skb descriptor
*/
desc = get_skb_desc(skb);
desc->desc_len = ring->desc_size;
desc->data_len = skb->len;
desc->desc = entry->priv;
desc->data = skb->data;
desc->ring = ring;
desc->entry = entry;
memcpy(entry->data_addr, skb->data, skb->len);
rt2x00lib_write_tx_desc(rt2x00dev, skb, control);
/*
* Enable beacon generation.
*/
rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, control->queue);
return 0;
}
EXPORT_SYMBOL_GPL(rt2x00pci_beacon_update);
/*
* TX data handlers.
*/
int rt2x00pci_write_tx_data(struct rt2x00_dev *rt2x00dev,
struct data_ring *ring, struct sk_buff *skb,
struct ieee80211_tx_control *control)
{
struct data_entry *entry = rt2x00_get_data_entry(ring);
__le32 *txd = entry->priv;
struct skb_desc *desc;
u32 word;
if (rt2x00_ring_full(ring))
return -EINVAL;
rt2x00_desc_read(txd, 0, &word);
if (rt2x00_get_field32(word, TXD_ENTRY_OWNER_NIC) ||
rt2x00_get_field32(word, TXD_ENTRY_VALID)) {
ERROR(rt2x00dev,
"Arrived at non-free entry in the non-full queue %d.\n"
"Please file bug report to %s.\n",
control->queue, DRV_PROJECT);
return -EINVAL;
}
/*
* Fill in skb descriptor
*/
desc = get_skb_desc(skb);
desc->desc_len = ring->desc_size;
desc->data_len = skb->len;
desc->desc = entry->priv;
desc->data = skb->data;
desc->ring = ring;
desc->entry = entry;
memcpy(entry->data_addr, skb->data, skb->len);
rt2x00lib_write_tx_desc(rt2x00dev, skb, control);
rt2x00_ring_index_inc(ring);
return 0;
}
EXPORT_SYMBOL_GPL(rt2x00pci_write_tx_data);
/*
* TX/RX data handlers.
*/
void rt2x00pci_rxdone(struct rt2x00_dev *rt2x00dev)
{
struct data_ring *ring = rt2x00dev->rx;
struct data_entry *entry;
struct sk_buff *skb;
struct ieee80211_hdr *hdr;
struct skb_desc *skbdesc;
struct rxdata_entry_desc desc;
int header_size;
__le32 *rxd;
int align;
u32 word;
while (1) {
entry = rt2x00_get_data_entry(ring);
rxd = entry->priv;
rt2x00_desc_read(rxd, 0, &word);
if (rt2x00_get_field32(word, RXD_ENTRY_OWNER_NIC))
break;
memset(&desc, 0, sizeof(desc));
rt2x00dev->ops->lib->fill_rxdone(entry, &desc);
hdr = (struct ieee80211_hdr *)entry->data_addr;
header_size =
ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control));
/*
* The data behind the ieee80211 header must be
* aligned on a 4 byte boundary.
*/
align = header_size % 4;
/*
* Allocate the sk_buffer, initialize it and copy
* all data into it.
*/
skb = dev_alloc_skb(desc.size + align);
if (!skb)
return;
skb_reserve(skb, align);
memcpy(skb_put(skb, desc.size), entry->data_addr, desc.size);
/*
* Fill in skb descriptor
*/
skbdesc = get_skb_desc(skb);
skbdesc->desc_len = entry->ring->desc_size;
skbdesc->data_len = skb->len;
skbdesc->desc = entry->priv;
skbdesc->data = skb->data;
skbdesc->ring = ring;
skbdesc->entry = entry;
/*
* Send the frame to rt2x00lib for further processing.
*/
rt2x00lib_rxdone(entry, skb, &desc);
if (test_bit(DEVICE_ENABLED_RADIO, &ring->rt2x00dev->flags)) {
rt2x00_set_field32(&word, RXD_ENTRY_OWNER_NIC, 1);
rt2x00_desc_write(rxd, 0, word);
}
rt2x00_ring_index_inc(ring);
}
}
EXPORT_SYMBOL_GPL(rt2x00pci_rxdone);
void rt2x00pci_txdone(struct rt2x00_dev *rt2x00dev, struct data_entry *entry,
const int tx_status, const int retry)
{
u32 word;
rt2x00lib_txdone(entry, tx_status, retry);
/*
* Make this entry available for reuse.
*/
entry->flags = 0;
rt2x00_desc_read(entry->priv, 0, &word);
rt2x00_set_field32(&word, TXD_ENTRY_OWNER_NIC, 0);
rt2x00_set_field32(&word, TXD_ENTRY_VALID, 0);
rt2x00_desc_write(entry->priv, 0, word);
rt2x00_ring_index_done_inc(entry->ring);
/*
* If the data ring was full before the txdone handler
* we must make sure the packet queue in the mac80211 stack
* is reenabled when the txdone handler has finished.
*/
if (!rt2x00_ring_full(entry->ring))
ieee80211_wake_queue(rt2x00dev->hw,
entry->tx_status.control.queue);
}
EXPORT_SYMBOL_GPL(rt2x00pci_txdone);
/*
* Device initialization handlers.
*/
#define priv_offset(__ring, __i) \
({ \
ring->data_addr + (i * ring->desc_size); \
})
#define data_addr_offset(__ring, __i) \
({ \
(__ring)->data_addr + \
((__ring)->stats.limit * (__ring)->desc_size) + \
((__i) * (__ring)->data_size); \
})
#define data_dma_offset(__ring, __i) \
({ \
(__ring)->data_dma + \
((__ring)->stats.limit * (__ring)->desc_size) + \
((__i) * (__ring)->data_size); \
})
static int rt2x00pci_alloc_dma(struct rt2x00_dev *rt2x00dev,
struct data_ring *ring)
{
unsigned int i;
/*
* Allocate DMA memory for descriptor and buffer.
*/
ring->data_addr = pci_alloc_consistent(rt2x00dev_pci(rt2x00dev),
rt2x00_get_ring_size(ring),
&ring->data_dma);
if (!ring->data_addr)
return -ENOMEM;
/*
* Initialize all ring entries to contain valid
* addresses.
*/
for (i = 0; i < ring->stats.limit; i++) {
ring->entry[i].priv = priv_offset(ring, i);
ring->entry[i].data_addr = data_addr_offset(ring, i);
ring->entry[i].data_dma = data_dma_offset(ring, i);
}
return 0;
}
static void rt2x00pci_free_dma(struct rt2x00_dev *rt2x00dev,
struct data_ring *ring)
{
if (ring->data_addr)
pci_free_consistent(rt2x00dev_pci(rt2x00dev),
rt2x00_get_ring_size(ring),
ring->data_addr, ring->data_dma);
ring->data_addr = NULL;
}
int rt2x00pci_initialize(struct rt2x00_dev *rt2x00dev)
{
struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
struct data_ring *ring;
int status;
/*
* Allocate DMA
*/
ring_for_each(rt2x00dev, ring) {
status = rt2x00pci_alloc_dma(rt2x00dev, ring);
if (status)
goto exit;
}
/*
* Register interrupt handler.
*/
status = request_irq(pci_dev->irq, rt2x00dev->ops->lib->irq_handler,
IRQF_SHARED, pci_name(pci_dev), rt2x00dev);
if (status) {
ERROR(rt2x00dev, "IRQ %d allocation failed (error %d).\n",
pci_dev->irq, status);
return status;
}
return 0;
exit:
rt2x00pci_uninitialize(rt2x00dev);
return status;
}
EXPORT_SYMBOL_GPL(rt2x00pci_initialize);
void rt2x00pci_uninitialize(struct rt2x00_dev *rt2x00dev)
{
struct data_ring *ring;
/*
* Free irq line.
*/
free_irq(rt2x00dev_pci(rt2x00dev)->irq, rt2x00dev);
/*
* Free DMA
*/
ring_for_each(rt2x00dev, ring)
rt2x00pci_free_dma(rt2x00dev, ring);
}
EXPORT_SYMBOL_GPL(rt2x00pci_uninitialize);
/*
* PCI driver handlers.
*/
static void rt2x00pci_free_reg(struct rt2x00_dev *rt2x00dev)
{
kfree(rt2x00dev->rf);
rt2x00dev->rf = NULL;
kfree(rt2x00dev->eeprom);
rt2x00dev->eeprom = NULL;
if (rt2x00dev->csr_addr) {
iounmap(rt2x00dev->csr_addr);
rt2x00dev->csr_addr = NULL;
}
}
static int rt2x00pci_alloc_reg(struct rt2x00_dev *rt2x00dev)
{
struct pci_dev *pci_dev = rt2x00dev_pci(rt2x00dev);
rt2x00dev->csr_addr = ioremap(pci_resource_start(pci_dev, 0),
pci_resource_len(pci_dev, 0));
if (!rt2x00dev->csr_addr)
goto exit;
rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
if (!rt2x00dev->eeprom)
goto exit;
rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
if (!rt2x00dev->rf)
goto exit;
return 0;
exit:
ERROR_PROBE("Failed to allocate registers.\n");
rt2x00pci_free_reg(rt2x00dev);
return -ENOMEM;
}
int rt2x00pci_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
{
struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_data;
struct ieee80211_hw *hw;
struct rt2x00_dev *rt2x00dev;
int retval;
retval = pci_request_regions(pci_dev, pci_name(pci_dev));
if (retval) {
ERROR_PROBE("PCI request regions failed.\n");
return retval;
}
retval = pci_enable_device(pci_dev);
if (retval) {
ERROR_PROBE("Enable device failed.\n");
goto exit_release_regions;
}
pci_set_master(pci_dev);
if (pci_set_mwi(pci_dev))
ERROR_PROBE("MWI not available.\n");
if (pci_set_dma_mask(pci_dev, DMA_64BIT_MASK) &&
pci_set_dma_mask(pci_dev, DMA_32BIT_MASK)) {
ERROR_PROBE("PCI DMA not supported.\n");
retval = -EIO;
goto exit_disable_device;
}
hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
if (!hw) {
ERROR_PROBE("Failed to allocate hardware.\n");
retval = -ENOMEM;
goto exit_disable_device;
}
pci_set_drvdata(pci_dev, hw);
rt2x00dev = hw->priv;
rt2x00dev->dev = pci_dev;
rt2x00dev->ops = ops;
rt2x00dev->hw = hw;
retval = rt2x00pci_alloc_reg(rt2x00dev);
if (retval)
goto exit_free_device;
retval = rt2x00lib_probe_dev(rt2x00dev);
if (retval)
goto exit_free_reg;
return 0;
exit_free_reg:
rt2x00pci_free_reg(rt2x00dev);
exit_free_device:
ieee80211_free_hw(hw);
exit_disable_device:
if (retval != -EBUSY)
pci_disable_device(pci_dev);
exit_release_regions:
pci_release_regions(pci_dev);
pci_set_drvdata(pci_dev, NULL);
return retval;
}
EXPORT_SYMBOL_GPL(rt2x00pci_probe);
void rt2x00pci_remove(struct pci_dev *pci_dev)
{
struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
struct rt2x00_dev *rt2x00dev = hw->priv;
/*
* Free all allocated data.
*/
rt2x00lib_remove_dev(rt2x00dev);
rt2x00pci_free_reg(rt2x00dev);
ieee80211_free_hw(hw);
/*
* Free the PCI device data.
*/
pci_set_drvdata(pci_dev, NULL);
pci_disable_device(pci_dev);
pci_release_regions(pci_dev);
}
EXPORT_SYMBOL_GPL(rt2x00pci_remove);
#ifdef CONFIG_PM
int rt2x00pci_suspend(struct pci_dev *pci_dev, pm_message_t state)
{
struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
struct rt2x00_dev *rt2x00dev = hw->priv;
int retval;
retval = rt2x00lib_suspend(rt2x00dev, state);
if (retval)
return retval;
rt2x00pci_free_reg(rt2x00dev);
pci_save_state(pci_dev);
pci_disable_device(pci_dev);
return pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));
}
EXPORT_SYMBOL_GPL(rt2x00pci_suspend);
int rt2x00pci_resume(struct pci_dev *pci_dev)
{
struct ieee80211_hw *hw = pci_get_drvdata(pci_dev);
struct rt2x00_dev *rt2x00dev = hw->priv;
int retval;
if (pci_set_power_state(pci_dev, PCI_D0) ||
pci_enable_device(pci_dev) ||
pci_restore_state(pci_dev)) {
ERROR(rt2x00dev, "Failed to resume device.\n");
return -EIO;
}
retval = rt2x00pci_alloc_reg(rt2x00dev);
if (retval)
return retval;
retval = rt2x00lib_resume(rt2x00dev);
if (retval)
goto exit_free_reg;
return 0;
exit_free_reg:
rt2x00pci_free_reg(rt2x00dev);
return retval;
}
EXPORT_SYMBOL_GPL(rt2x00pci_resume);
#endif /* CONFIG_PM */
/*
* rt2x00pci module information.
*/
MODULE_AUTHOR(DRV_PROJECT);
MODULE_VERSION(DRV_VERSION);
MODULE_DESCRIPTION("rt2x00 library");
MODULE_LICENSE("GPL");