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linux/drivers/net/wireless/rt2x00/rt2800mmio.c

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/* Copyright (C) 2009 - 2010 Ivo van Doorn <IvDoorn@gmail.com>
* Copyright (C) 2009 Alban Browaeys <prahal@yahoo.com>
* Copyright (C) 2009 Felix Fietkau <nbd@openwrt.org>
* Copyright (C) 2009 Luis Correia <luis.f.correia@gmail.com>
* Copyright (C) 2009 Mattias Nissler <mattias.nissler@gmx.de>
* Copyright (C) 2009 Mark Asselstine <asselsm@gmail.com>
* Copyright (C) 2009 Xose Vazquez Perez <xose.vazquez@gmail.com>
* Copyright (C) 2009 Bart Zolnierkiewicz <bzolnier@gmail.com>
* <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, see <http://www.gnu.org/licenses/>.
*/
/* Module: rt2800mmio
* Abstract: rt2800 MMIO device routines.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/export.h>
#include "rt2x00.h"
#include "rt2x00mmio.h"
#include "rt2800.h"
#include "rt2800lib.h"
#include "rt2800mmio.h"
/*
* TX descriptor initialization
*/
__le32 *rt2800mmio_get_txwi(struct queue_entry *entry)
{
return (__le32 *) entry->skb->data;
}
EXPORT_SYMBOL_GPL(rt2800mmio_get_txwi);
void rt2800mmio_write_tx_desc(struct queue_entry *entry,
struct txentry_desc *txdesc)
{
struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
struct queue_entry_priv_mmio *entry_priv = entry->priv_data;
__le32 *txd = entry_priv->desc;
u32 word;
const unsigned int txwi_size = entry->queue->winfo_size;
/*
* The buffers pointed by SD_PTR0/SD_LEN0 and SD_PTR1/SD_LEN1
* must contains a TXWI structure + 802.11 header + padding + 802.11
* data. We choose to have SD_PTR0/SD_LEN0 only contains TXWI and
* SD_PTR1/SD_LEN1 contains 802.11 header + padding + 802.11
* data. It means that LAST_SEC0 is always 0.
*/
/*
* Initialize TX descriptor
*/
word = 0;
rt2x00_set_field32(&word, TXD_W0_SD_PTR0, skbdesc->skb_dma);
rt2x00_desc_write(txd, 0, word);
word = 0;
rt2x00_set_field32(&word, TXD_W1_SD_LEN1, entry->skb->len);
rt2x00_set_field32(&word, TXD_W1_LAST_SEC1,
!test_bit(ENTRY_TXD_MORE_FRAG, &txdesc->flags));
rt2x00_set_field32(&word, TXD_W1_BURST,
test_bit(ENTRY_TXD_BURST, &txdesc->flags));
rt2x00_set_field32(&word, TXD_W1_SD_LEN0, txwi_size);
rt2x00_set_field32(&word, TXD_W1_LAST_SEC0, 0);
rt2x00_set_field32(&word, TXD_W1_DMA_DONE, 0);
rt2x00_desc_write(txd, 1, word);
word = 0;
rt2x00_set_field32(&word, TXD_W2_SD_PTR1,
skbdesc->skb_dma + txwi_size);
rt2x00_desc_write(txd, 2, word);
word = 0;
rt2x00_set_field32(&word, TXD_W3_WIV,
!test_bit(ENTRY_TXD_ENCRYPT_IV, &txdesc->flags));
rt2x00_set_field32(&word, TXD_W3_QSEL, 2);
rt2x00_desc_write(txd, 3, word);
/*
* Register descriptor details in skb frame descriptor.
*/
skbdesc->desc = txd;
skbdesc->desc_len = TXD_DESC_SIZE;
}
EXPORT_SYMBOL_GPL(rt2800mmio_write_tx_desc);
/*
* RX control handlers
*/
void rt2800mmio_fill_rxdone(struct queue_entry *entry,
struct rxdone_entry_desc *rxdesc)
{
struct queue_entry_priv_mmio *entry_priv = entry->priv_data;
__le32 *rxd = entry_priv->desc;
u32 word;
rt2x00_desc_read(rxd, 3, &word);
if (rt2x00_get_field32(word, RXD_W3_CRC_ERROR))
rxdesc->flags |= RX_FLAG_FAILED_FCS_CRC;
/*
* Unfortunately we don't know the cipher type used during
* decryption. This prevents us from correct providing
* correct statistics through debugfs.
*/
rxdesc->cipher_status = rt2x00_get_field32(word, RXD_W3_CIPHER_ERROR);
if (rt2x00_get_field32(word, RXD_W3_DECRYPTED)) {
/*
* Hardware has stripped IV/EIV data from 802.11 frame during
* decryption. Unfortunately the descriptor doesn't contain
* any fields with the EIV/IV data either, so they can't
* be restored by rt2x00lib.
*/
rxdesc->flags |= RX_FLAG_IV_STRIPPED;
/*
* The hardware has already checked the Michael Mic and has
* stripped it from the frame. Signal this to mac80211.
*/
rxdesc->flags |= RX_FLAG_MMIC_STRIPPED;
if (rxdesc->cipher_status == RX_CRYPTO_SUCCESS)
rxdesc->flags |= RX_FLAG_DECRYPTED;
else if (rxdesc->cipher_status == RX_CRYPTO_FAIL_MIC)
rxdesc->flags |= RX_FLAG_MMIC_ERROR;
}
if (rt2x00_get_field32(word, RXD_W3_MY_BSS))
rxdesc->dev_flags |= RXDONE_MY_BSS;
if (rt2x00_get_field32(word, RXD_W3_L2PAD))
rxdesc->dev_flags |= RXDONE_L2PAD;
/*
* Process the RXWI structure that is at the start of the buffer.
*/
rt2800_process_rxwi(entry, rxdesc);
}
EXPORT_SYMBOL_GPL(rt2800mmio_fill_rxdone);
/*
* Interrupt functions.
*/
static void rt2800mmio_wakeup(struct rt2x00_dev *rt2x00dev)
{
struct ieee80211_conf conf = { .flags = 0 };
struct rt2x00lib_conf libconf = { .conf = &conf };
rt2800_config(rt2x00dev, &libconf, IEEE80211_CONF_CHANGE_PS);
}
static bool rt2800mmio_txdone_entry_check(struct queue_entry *entry, u32 status)
{
__le32 *txwi;
u32 word;
int wcid, tx_wcid;
wcid = rt2x00_get_field32(status, TX_STA_FIFO_WCID);
txwi = rt2800_drv_get_txwi(entry);
rt2x00_desc_read(txwi, 1, &word);
tx_wcid = rt2x00_get_field32(word, TXWI_W1_WIRELESS_CLI_ID);
return (tx_wcid == wcid);
}
static bool rt2800mmio_txdone_find_entry(struct queue_entry *entry, void *data)
{
u32 status = *(u32 *)data;
/*
* rt2800pci hardware might reorder frames when exchanging traffic
* with multiple BA enabled STAs.
*
* For example, a tx queue
* [ STA1 | STA2 | STA1 | STA2 ]
* can result in tx status reports
* [ STA1 | STA1 | STA2 | STA2 ]
* when the hw decides to aggregate the frames for STA1 into one AMPDU.
*
* To mitigate this effect, associate the tx status to the first frame
* in the tx queue with a matching wcid.
*/
if (rt2800mmio_txdone_entry_check(entry, status) &&
!test_bit(ENTRY_DATA_STATUS_SET, &entry->flags)) {
/*
* Got a matching frame, associate the tx status with
* the frame
*/
entry->status = status;
set_bit(ENTRY_DATA_STATUS_SET, &entry->flags);
return true;
}
/* Check the next frame */
return false;
}
static bool rt2800mmio_txdone_match_first(struct queue_entry *entry, void *data)
{
u32 status = *(u32 *)data;
/*
* Find the first frame without tx status and assign this status to it
* regardless if it matches or not.
*/
if (!test_bit(ENTRY_DATA_STATUS_SET, &entry->flags)) {
/*
* Got a matching frame, associate the tx status with
* the frame
*/
entry->status = status;
set_bit(ENTRY_DATA_STATUS_SET, &entry->flags);
return true;
}
/* Check the next frame */
return false;
}
static bool rt2800mmio_txdone_release_entries(struct queue_entry *entry,
void *data)
{
if (test_bit(ENTRY_DATA_STATUS_SET, &entry->flags)) {
rt2800_txdone_entry(entry, entry->status,
rt2800mmio_get_txwi(entry));
return false;
}
/* No more frames to release */
return true;
}
static bool rt2800mmio_txdone(struct rt2x00_dev *rt2x00dev)
{
struct data_queue *queue;
u32 status;
u8 qid;
int max_tx_done = 16;
while (kfifo_get(&rt2x00dev->txstatus_fifo, &status)) {
qid = rt2x00_get_field32(status, TX_STA_FIFO_PID_QUEUE);
if (unlikely(qid >= QID_RX)) {
/*
* Unknown queue, this shouldn't happen. Just drop
* this tx status.
*/
rt2x00_warn(rt2x00dev, "Got TX status report with unexpected pid %u, dropping\n",
qid);
break;
}
queue = rt2x00queue_get_tx_queue(rt2x00dev, qid);
if (unlikely(queue == NULL)) {
/*
* The queue is NULL, this shouldn't happen. Stop
* processing here and drop the tx status
*/
rt2x00_warn(rt2x00dev, "Got TX status for an unavailable queue %u, dropping\n",
qid);
break;
}
if (unlikely(rt2x00queue_empty(queue))) {
/*
* The queue is empty. Stop processing here
* and drop the tx status.
*/
rt2x00_warn(rt2x00dev, "Got TX status for an empty queue %u, dropping\n",
qid);
break;
}
/*
* Let's associate this tx status with the first
* matching frame.
*/
if (!rt2x00queue_for_each_entry(queue, Q_INDEX_DONE,
Q_INDEX, &status,
rt2800mmio_txdone_find_entry)) {
/*
* We cannot match the tx status to any frame, so just
* use the first one.
*/
if (!rt2x00queue_for_each_entry(queue, Q_INDEX_DONE,
Q_INDEX, &status,
rt2800mmio_txdone_match_first)) {
rt2x00_warn(rt2x00dev, "No frame found for TX status on queue %u, dropping\n",
qid);
break;
}
}
/*
* Release all frames with a valid tx status.
*/
rt2x00queue_for_each_entry(queue, Q_INDEX_DONE,
Q_INDEX, NULL,
rt2800mmio_txdone_release_entries);
if (--max_tx_done == 0)
break;
}
return !max_tx_done;
}
static inline void rt2800mmio_enable_interrupt(struct rt2x00_dev *rt2x00dev,
struct rt2x00_field32 irq_field)
{
u32 reg;
/*
* Enable a single interrupt. The interrupt mask register
* access needs locking.
*/
spin_lock_irq(&rt2x00dev->irqmask_lock);
rt2x00mmio_register_read(rt2x00dev, INT_MASK_CSR, &reg);
rt2x00_set_field32(&reg, irq_field, 1);
rt2x00mmio_register_write(rt2x00dev, INT_MASK_CSR, reg);
spin_unlock_irq(&rt2x00dev->irqmask_lock);
}
void rt2800mmio_txstatus_tasklet(unsigned long data)
{
struct rt2x00_dev *rt2x00dev = (struct rt2x00_dev *)data;
if (rt2800mmio_txdone(rt2x00dev))
tasklet_schedule(&rt2x00dev->txstatus_tasklet);
/*
* No need to enable the tx status interrupt here as we always
* leave it enabled to minimize the possibility of a tx status
* register overflow. See comment in interrupt handler.
*/
}
EXPORT_SYMBOL_GPL(rt2800mmio_txstatus_tasklet);
void rt2800mmio_pretbtt_tasklet(unsigned long data)
{
struct rt2x00_dev *rt2x00dev = (struct rt2x00_dev *)data;
rt2x00lib_pretbtt(rt2x00dev);
if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
rt2800mmio_enable_interrupt(rt2x00dev, INT_MASK_CSR_PRE_TBTT);
}
EXPORT_SYMBOL_GPL(rt2800mmio_pretbtt_tasklet);
void rt2800mmio_tbtt_tasklet(unsigned long data)
{
struct rt2x00_dev *rt2x00dev = (struct rt2x00_dev *)data;
struct rt2800_drv_data *drv_data = rt2x00dev->drv_data;
u32 reg;
rt2x00lib_beacondone(rt2x00dev);
if (rt2x00dev->intf_ap_count) {
/*
* The rt2800pci hardware tbtt timer is off by 1us per tbtt
* causing beacon skew and as a result causing problems with
* some powersaving clients over time. Shorten the beacon
* interval every 64 beacons by 64us to mitigate this effect.
*/
if (drv_data->tbtt_tick == (BCN_TBTT_OFFSET - 2)) {
rt2x00mmio_register_read(rt2x00dev, BCN_TIME_CFG, &reg);
rt2x00_set_field32(&reg, BCN_TIME_CFG_BEACON_INTERVAL,
(rt2x00dev->beacon_int * 16) - 1);
rt2x00mmio_register_write(rt2x00dev, BCN_TIME_CFG, reg);
} else if (drv_data->tbtt_tick == (BCN_TBTT_OFFSET - 1)) {
rt2x00mmio_register_read(rt2x00dev, BCN_TIME_CFG, &reg);
rt2x00_set_field32(&reg, BCN_TIME_CFG_BEACON_INTERVAL,
(rt2x00dev->beacon_int * 16));
rt2x00mmio_register_write(rt2x00dev, BCN_TIME_CFG, reg);
}
drv_data->tbtt_tick++;
drv_data->tbtt_tick %= BCN_TBTT_OFFSET;
}
if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
rt2800mmio_enable_interrupt(rt2x00dev, INT_MASK_CSR_TBTT);
}
EXPORT_SYMBOL_GPL(rt2800mmio_tbtt_tasklet);
void rt2800mmio_rxdone_tasklet(unsigned long data)
{
struct rt2x00_dev *rt2x00dev = (struct rt2x00_dev *)data;
if (rt2x00mmio_rxdone(rt2x00dev))
tasklet_schedule(&rt2x00dev->rxdone_tasklet);
else if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
rt2800mmio_enable_interrupt(rt2x00dev, INT_MASK_CSR_RX_DONE);
}
EXPORT_SYMBOL_GPL(rt2800mmio_rxdone_tasklet);
void rt2800mmio_autowake_tasklet(unsigned long data)
{
struct rt2x00_dev *rt2x00dev = (struct rt2x00_dev *)data;
rt2800mmio_wakeup(rt2x00dev);
if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
rt2800mmio_enable_interrupt(rt2x00dev,
INT_MASK_CSR_AUTO_WAKEUP);
}
EXPORT_SYMBOL_GPL(rt2800mmio_autowake_tasklet);
static void rt2800mmio_txstatus_interrupt(struct rt2x00_dev *rt2x00dev)
{
u32 status;
int i;
/*
* The TX_FIFO_STATUS interrupt needs special care. We should
* read TX_STA_FIFO but we should do it immediately as otherwise
* the register can overflow and we would lose status reports.
*
* Hence, read the TX_STA_FIFO register and copy all tx status
* reports into a kernel FIFO which is handled in the txstatus
* tasklet. We use a tasklet to process the tx status reports
* because we can schedule the tasklet multiple times (when the
* interrupt fires again during tx status processing).
*
* Furthermore we don't disable the TX_FIFO_STATUS
* interrupt here but leave it enabled so that the TX_STA_FIFO
* can also be read while the tx status tasklet gets executed.
*
* Since we have only one producer and one consumer we don't
* need to lock the kfifo.
*/
for (i = 0; i < rt2x00dev->tx->limit; i++) {
rt2x00mmio_register_read(rt2x00dev, TX_STA_FIFO, &status);
if (!rt2x00_get_field32(status, TX_STA_FIFO_VALID))
break;
if (!kfifo_put(&rt2x00dev->txstatus_fifo, status)) {
rt2x00_warn(rt2x00dev, "TX status FIFO overrun, drop tx status report\n");
break;
}
}
/* Schedule the tasklet for processing the tx status. */
tasklet_schedule(&rt2x00dev->txstatus_tasklet);
}
irqreturn_t rt2800mmio_interrupt(int irq, void *dev_instance)
{
struct rt2x00_dev *rt2x00dev = dev_instance;
u32 reg, mask;
/* Read status and ACK all interrupts */
rt2x00mmio_register_read(rt2x00dev, INT_SOURCE_CSR, &reg);
rt2x00mmio_register_write(rt2x00dev, INT_SOURCE_CSR, reg);
if (!reg)
return IRQ_NONE;
if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
return IRQ_HANDLED;
/*
* Since INT_MASK_CSR and INT_SOURCE_CSR use the same bits
* for interrupts and interrupt masks we can just use the value of
* INT_SOURCE_CSR to create the interrupt mask.
*/
mask = ~reg;
if (rt2x00_get_field32(reg, INT_SOURCE_CSR_TX_FIFO_STATUS)) {
rt2800mmio_txstatus_interrupt(rt2x00dev);
/*
* Never disable the TX_FIFO_STATUS interrupt.
*/
rt2x00_set_field32(&mask, INT_MASK_CSR_TX_FIFO_STATUS, 1);
}
if (rt2x00_get_field32(reg, INT_SOURCE_CSR_PRE_TBTT))
tasklet_hi_schedule(&rt2x00dev->pretbtt_tasklet);
if (rt2x00_get_field32(reg, INT_SOURCE_CSR_TBTT))
tasklet_hi_schedule(&rt2x00dev->tbtt_tasklet);
if (rt2x00_get_field32(reg, INT_SOURCE_CSR_RX_DONE))
tasklet_schedule(&rt2x00dev->rxdone_tasklet);
if (rt2x00_get_field32(reg, INT_SOURCE_CSR_AUTO_WAKEUP))
tasklet_schedule(&rt2x00dev->autowake_tasklet);
/*
* Disable all interrupts for which a tasklet was scheduled right now,
* the tasklet will reenable the appropriate interrupts.
*/
spin_lock(&rt2x00dev->irqmask_lock);
rt2x00mmio_register_read(rt2x00dev, INT_MASK_CSR, &reg);
reg &= mask;
rt2x00mmio_register_write(rt2x00dev, INT_MASK_CSR, reg);
spin_unlock(&rt2x00dev->irqmask_lock);
return IRQ_HANDLED;
}
EXPORT_SYMBOL_GPL(rt2800mmio_interrupt);
void rt2800mmio_toggle_irq(struct rt2x00_dev *rt2x00dev,
enum dev_state state)
{
u32 reg;
unsigned long flags;
/*
* When interrupts are being enabled, the interrupt registers
* should clear the register to assure a clean state.
*/
if (state == STATE_RADIO_IRQ_ON) {
rt2x00mmio_register_read(rt2x00dev, INT_SOURCE_CSR, &reg);
rt2x00mmio_register_write(rt2x00dev, INT_SOURCE_CSR, reg);
}
spin_lock_irqsave(&rt2x00dev->irqmask_lock, flags);
reg = 0;
if (state == STATE_RADIO_IRQ_ON) {
rt2x00_set_field32(&reg, INT_MASK_CSR_RX_DONE, 1);
rt2x00_set_field32(&reg, INT_MASK_CSR_TBTT, 1);
rt2x00_set_field32(&reg, INT_MASK_CSR_PRE_TBTT, 1);
rt2x00_set_field32(&reg, INT_MASK_CSR_TX_FIFO_STATUS, 1);
rt2x00_set_field32(&reg, INT_MASK_CSR_AUTO_WAKEUP, 1);
}
rt2x00mmio_register_write(rt2x00dev, INT_MASK_CSR, reg);
spin_unlock_irqrestore(&rt2x00dev->irqmask_lock, flags);
if (state == STATE_RADIO_IRQ_OFF) {
/*
* Wait for possibly running tasklets to finish.
*/
tasklet_kill(&rt2x00dev->txstatus_tasklet);
tasklet_kill(&rt2x00dev->rxdone_tasklet);
tasklet_kill(&rt2x00dev->autowake_tasklet);
tasklet_kill(&rt2x00dev->tbtt_tasklet);
tasklet_kill(&rt2x00dev->pretbtt_tasklet);
}
}
EXPORT_SYMBOL_GPL(rt2800mmio_toggle_irq);
/*
* Queue handlers.
*/
void rt2800mmio_start_queue(struct data_queue *queue)
{
struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
u32 reg;
switch (queue->qid) {
case QID_RX:
rt2x00mmio_register_read(rt2x00dev, MAC_SYS_CTRL, &reg);
rt2x00_set_field32(&reg, MAC_SYS_CTRL_ENABLE_RX, 1);
rt2x00mmio_register_write(rt2x00dev, MAC_SYS_CTRL, reg);
break;
case QID_BEACON:
rt2x00mmio_register_read(rt2x00dev, BCN_TIME_CFG, &reg);
rt2x00_set_field32(&reg, BCN_TIME_CFG_TSF_TICKING, 1);
rt2x00_set_field32(&reg, BCN_TIME_CFG_TBTT_ENABLE, 1);
rt2x00_set_field32(&reg, BCN_TIME_CFG_BEACON_GEN, 1);
rt2x00mmio_register_write(rt2x00dev, BCN_TIME_CFG, reg);
rt2x00mmio_register_read(rt2x00dev, INT_TIMER_EN, &reg);
rt2x00_set_field32(&reg, INT_TIMER_EN_PRE_TBTT_TIMER, 1);
rt2x00mmio_register_write(rt2x00dev, INT_TIMER_EN, reg);
break;
default:
break;
}
}
EXPORT_SYMBOL_GPL(rt2800mmio_start_queue);
void rt2800mmio_kick_queue(struct data_queue *queue)
{
struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
struct queue_entry *entry;
switch (queue->qid) {
case QID_AC_VO:
case QID_AC_VI:
case QID_AC_BE:
case QID_AC_BK:
entry = rt2x00queue_get_entry(queue, Q_INDEX);
rt2x00mmio_register_write(rt2x00dev, TX_CTX_IDX(queue->qid),
entry->entry_idx);
break;
case QID_MGMT:
entry = rt2x00queue_get_entry(queue, Q_INDEX);
rt2x00mmio_register_write(rt2x00dev, TX_CTX_IDX(5),
entry->entry_idx);
break;
default:
break;
}
}
EXPORT_SYMBOL_GPL(rt2800mmio_kick_queue);
void rt2800mmio_stop_queue(struct data_queue *queue)
{
struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
u32 reg;
switch (queue->qid) {
case QID_RX:
rt2x00mmio_register_read(rt2x00dev, MAC_SYS_CTRL, &reg);
rt2x00_set_field32(&reg, MAC_SYS_CTRL_ENABLE_RX, 0);
rt2x00mmio_register_write(rt2x00dev, MAC_SYS_CTRL, reg);
break;
case QID_BEACON:
rt2x00mmio_register_read(rt2x00dev, BCN_TIME_CFG, &reg);
rt2x00_set_field32(&reg, BCN_TIME_CFG_TSF_TICKING, 0);
rt2x00_set_field32(&reg, BCN_TIME_CFG_TBTT_ENABLE, 0);
rt2x00_set_field32(&reg, BCN_TIME_CFG_BEACON_GEN, 0);
rt2x00mmio_register_write(rt2x00dev, BCN_TIME_CFG, reg);
rt2x00mmio_register_read(rt2x00dev, INT_TIMER_EN, &reg);
rt2x00_set_field32(&reg, INT_TIMER_EN_PRE_TBTT_TIMER, 0);
rt2x00mmio_register_write(rt2x00dev, INT_TIMER_EN, reg);
/*
* Wait for current invocation to finish. The tasklet
* won't be scheduled anymore afterwards since we disabled
* the TBTT and PRE TBTT timer.
*/
tasklet_kill(&rt2x00dev->tbtt_tasklet);
tasklet_kill(&rt2x00dev->pretbtt_tasklet);
break;
default:
break;
}
}
EXPORT_SYMBOL_GPL(rt2800mmio_stop_queue);
void rt2800mmio_queue_init(struct data_queue *queue)
{
struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
unsigned short txwi_size, rxwi_size;
rt2800_get_txwi_rxwi_size(rt2x00dev, &txwi_size, &rxwi_size);
switch (queue->qid) {
case QID_RX:
queue->limit = 128;
queue->data_size = AGGREGATION_SIZE;
queue->desc_size = RXD_DESC_SIZE;
queue->winfo_size = rxwi_size;
queue->priv_size = sizeof(struct queue_entry_priv_mmio);
break;
case QID_AC_VO:
case QID_AC_VI:
case QID_AC_BE:
case QID_AC_BK:
queue->limit = 64;
queue->data_size = AGGREGATION_SIZE;
queue->desc_size = TXD_DESC_SIZE;
queue->winfo_size = txwi_size;
queue->priv_size = sizeof(struct queue_entry_priv_mmio);
break;
case QID_BEACON:
queue->limit = 8;
queue->data_size = 0; /* No DMA required for beacons */
queue->desc_size = TXD_DESC_SIZE;
queue->winfo_size = txwi_size;
queue->priv_size = sizeof(struct queue_entry_priv_mmio);
break;
case QID_ATIM:
/* fallthrough */
default:
BUG();
break;
}
}
EXPORT_SYMBOL_GPL(rt2800mmio_queue_init);
/*
* Initialization functions.
*/
bool rt2800mmio_get_entry_state(struct queue_entry *entry)
{
struct queue_entry_priv_mmio *entry_priv = entry->priv_data;
u32 word;
if (entry->queue->qid == QID_RX) {
rt2x00_desc_read(entry_priv->desc, 1, &word);
return (!rt2x00_get_field32(word, RXD_W1_DMA_DONE));
} else {
rt2x00_desc_read(entry_priv->desc, 1, &word);
return (!rt2x00_get_field32(word, TXD_W1_DMA_DONE));
}
}
EXPORT_SYMBOL_GPL(rt2800mmio_get_entry_state);
void rt2800mmio_clear_entry(struct queue_entry *entry)
{
struct queue_entry_priv_mmio *entry_priv = entry->priv_data;
struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
u32 word;
if (entry->queue->qid == QID_RX) {
rt2x00_desc_read(entry_priv->desc, 0, &word);
rt2x00_set_field32(&word, RXD_W0_SDP0, skbdesc->skb_dma);
rt2x00_desc_write(entry_priv->desc, 0, word);
rt2x00_desc_read(entry_priv->desc, 1, &word);
rt2x00_set_field32(&word, RXD_W1_DMA_DONE, 0);
rt2x00_desc_write(entry_priv->desc, 1, word);
/*
* Set RX IDX in register to inform hardware that we have
* handled this entry and it is available for reuse again.
*/
rt2x00mmio_register_write(rt2x00dev, RX_CRX_IDX,
entry->entry_idx);
} else {
rt2x00_desc_read(entry_priv->desc, 1, &word);
rt2x00_set_field32(&word, TXD_W1_DMA_DONE, 1);
rt2x00_desc_write(entry_priv->desc, 1, word);
}
}
EXPORT_SYMBOL_GPL(rt2800mmio_clear_entry);
int rt2800mmio_init_queues(struct rt2x00_dev *rt2x00dev)
{
struct queue_entry_priv_mmio *entry_priv;
/*
* Initialize registers.
*/
entry_priv = rt2x00dev->tx[0].entries[0].priv_data;
rt2x00mmio_register_write(rt2x00dev, TX_BASE_PTR0,
entry_priv->desc_dma);
rt2x00mmio_register_write(rt2x00dev, TX_MAX_CNT0,
rt2x00dev->tx[0].limit);
rt2x00mmio_register_write(rt2x00dev, TX_CTX_IDX0, 0);
rt2x00mmio_register_write(rt2x00dev, TX_DTX_IDX0, 0);
entry_priv = rt2x00dev->tx[1].entries[0].priv_data;
rt2x00mmio_register_write(rt2x00dev, TX_BASE_PTR1,
entry_priv->desc_dma);
rt2x00mmio_register_write(rt2x00dev, TX_MAX_CNT1,
rt2x00dev->tx[1].limit);
rt2x00mmio_register_write(rt2x00dev, TX_CTX_IDX1, 0);
rt2x00mmio_register_write(rt2x00dev, TX_DTX_IDX1, 0);
entry_priv = rt2x00dev->tx[2].entries[0].priv_data;
rt2x00mmio_register_write(rt2x00dev, TX_BASE_PTR2,
entry_priv->desc_dma);
rt2x00mmio_register_write(rt2x00dev, TX_MAX_CNT2,
rt2x00dev->tx[2].limit);
rt2x00mmio_register_write(rt2x00dev, TX_CTX_IDX2, 0);
rt2x00mmio_register_write(rt2x00dev, TX_DTX_IDX2, 0);
entry_priv = rt2x00dev->tx[3].entries[0].priv_data;
rt2x00mmio_register_write(rt2x00dev, TX_BASE_PTR3,
entry_priv->desc_dma);
rt2x00mmio_register_write(rt2x00dev, TX_MAX_CNT3,
rt2x00dev->tx[3].limit);
rt2x00mmio_register_write(rt2x00dev, TX_CTX_IDX3, 0);
rt2x00mmio_register_write(rt2x00dev, TX_DTX_IDX3, 0);
rt2x00mmio_register_write(rt2x00dev, TX_BASE_PTR4, 0);
rt2x00mmio_register_write(rt2x00dev, TX_MAX_CNT4, 0);
rt2x00mmio_register_write(rt2x00dev, TX_CTX_IDX4, 0);
rt2x00mmio_register_write(rt2x00dev, TX_DTX_IDX4, 0);
rt2x00mmio_register_write(rt2x00dev, TX_BASE_PTR5, 0);
rt2x00mmio_register_write(rt2x00dev, TX_MAX_CNT5, 0);
rt2x00mmio_register_write(rt2x00dev, TX_CTX_IDX5, 0);
rt2x00mmio_register_write(rt2x00dev, TX_DTX_IDX5, 0);
entry_priv = rt2x00dev->rx->entries[0].priv_data;
rt2x00mmio_register_write(rt2x00dev, RX_BASE_PTR,
entry_priv->desc_dma);
rt2x00mmio_register_write(rt2x00dev, RX_MAX_CNT,
rt2x00dev->rx[0].limit);
rt2x00mmio_register_write(rt2x00dev, RX_CRX_IDX,
rt2x00dev->rx[0].limit - 1);
rt2x00mmio_register_write(rt2x00dev, RX_DRX_IDX, 0);
rt2800_disable_wpdma(rt2x00dev);
rt2x00mmio_register_write(rt2x00dev, DELAY_INT_CFG, 0);
return 0;
}
EXPORT_SYMBOL_GPL(rt2800mmio_init_queues);
int rt2800mmio_init_registers(struct rt2x00_dev *rt2x00dev)
{
u32 reg;
/*
* Reset DMA indexes
*/
rt2x00mmio_register_read(rt2x00dev, WPDMA_RST_IDX, &reg);
rt2x00_set_field32(&reg, WPDMA_RST_IDX_DTX_IDX0, 1);
rt2x00_set_field32(&reg, WPDMA_RST_IDX_DTX_IDX1, 1);
rt2x00_set_field32(&reg, WPDMA_RST_IDX_DTX_IDX2, 1);
rt2x00_set_field32(&reg, WPDMA_RST_IDX_DTX_IDX3, 1);
rt2x00_set_field32(&reg, WPDMA_RST_IDX_DTX_IDX4, 1);
rt2x00_set_field32(&reg, WPDMA_RST_IDX_DTX_IDX5, 1);
rt2x00_set_field32(&reg, WPDMA_RST_IDX_DRX_IDX0, 1);
rt2x00mmio_register_write(rt2x00dev, WPDMA_RST_IDX, reg);
rt2x00mmio_register_write(rt2x00dev, PBF_SYS_CTRL, 0x00000e1f);
rt2x00mmio_register_write(rt2x00dev, PBF_SYS_CTRL, 0x00000e00);
if (rt2x00_is_pcie(rt2x00dev) &&
(rt2x00_rt(rt2x00dev, RT3090) ||
rt2x00_rt(rt2x00dev, RT3390) ||
rt2x00_rt(rt2x00dev, RT3572) ||
rt2x00_rt(rt2x00dev, RT3593) ||
rt2x00_rt(rt2x00dev, RT5390) ||
rt2x00_rt(rt2x00dev, RT5392) ||
rt2x00_rt(rt2x00dev, RT5592))) {
rt2x00mmio_register_read(rt2x00dev, AUX_CTRL, &reg);
rt2x00_set_field32(&reg, AUX_CTRL_FORCE_PCIE_CLK, 1);
rt2x00_set_field32(&reg, AUX_CTRL_WAKE_PCIE_EN, 1);
rt2x00mmio_register_write(rt2x00dev, AUX_CTRL, reg);
}
rt2x00mmio_register_write(rt2x00dev, PWR_PIN_CFG, 0x00000003);
reg = 0;
rt2x00_set_field32(&reg, MAC_SYS_CTRL_RESET_CSR, 1);
rt2x00_set_field32(&reg, MAC_SYS_CTRL_RESET_BBP, 1);
rt2x00mmio_register_write(rt2x00dev, MAC_SYS_CTRL, reg);
rt2x00mmio_register_write(rt2x00dev, MAC_SYS_CTRL, 0x00000000);
return 0;
}
EXPORT_SYMBOL_GPL(rt2800mmio_init_registers);
/*
* Device state switch handlers.
*/
int rt2800mmio_enable_radio(struct rt2x00_dev *rt2x00dev)
{
/* Wait for DMA, ignore error until we initialize queues. */
rt2800_wait_wpdma_ready(rt2x00dev);
if (unlikely(rt2800mmio_init_queues(rt2x00dev)))
return -EIO;
return rt2800_enable_radio(rt2x00dev);
}
EXPORT_SYMBOL_GPL(rt2800mmio_enable_radio);
MODULE_AUTHOR(DRV_PROJECT);
MODULE_VERSION(DRV_VERSION);
MODULE_DESCRIPTION("rt2800 MMIO library");
MODULE_LICENSE("GPL");
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