diff options
Diffstat (limited to 'drivers/net/wireless/ralink/rt2x00/rt2800mmio.c')
| -rw-r--r-- | drivers/net/wireless/ralink/rt2x00/rt2800mmio.c | 138 |
1 files changed, 91 insertions, 47 deletions
diff --git a/drivers/net/wireless/ralink/rt2x00/rt2800mmio.c b/drivers/net/wireless/ralink/rt2x00/rt2800mmio.c index ddb88cfeace2..d1de8e2ff690 100644 --- a/drivers/net/wireless/ralink/rt2x00/rt2800mmio.c +++ b/drivers/net/wireless/ralink/rt2x00/rt2800mmio.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0-or-later /* 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> @@ -7,19 +8,6 @@ * 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 @@ -255,26 +243,12 @@ void rt2800mmio_autowake_tasklet(unsigned long data) } EXPORT_SYMBOL_GPL(rt2800mmio_autowake_tasklet); -static void rt2800mmio_txdone(struct rt2x00_dev *rt2x00dev) -{ - bool timeout = false; - - while (!kfifo_is_empty(&rt2x00dev->txstatus_fifo) || - (timeout = rt2800_txstatus_timeout(rt2x00dev))) { - - rt2800_txdone(rt2x00dev); - - if (timeout) - rt2800_txdone_nostatus(rt2x00dev); - } -} - -static bool rt2800mmio_fetch_txstatus(struct rt2x00_dev *rt2x00dev) +static void rt2800mmio_fetch_txstatus(struct rt2x00_dev *rt2x00dev) { u32 status; - bool more = false; + unsigned long flags; - /* FIXEME: rewrite this comment + /* * 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. @@ -285,34 +259,32 @@ static bool rt2800mmio_fetch_txstatus(struct rt2x00_dev *rt2x00dev) * because we can schedule the tasklet multiple times (when the * interrupt fires again during tx status processing). * - * txstatus tasklet is called with INT_SOURCE_CSR_TX_FIFO_STATUS - * disabled so have only one producer and one consumer - we don't - * need to lock the kfifo. + * We also read statuses from tx status timeout timer, use + * lock to prevent concurent writes to fifo. */ + + spin_lock_irqsave(&rt2x00dev->irqmask_lock, flags); + while (!kfifo_is_full(&rt2x00dev->txstatus_fifo)) { status = rt2x00mmio_register_read(rt2x00dev, TX_STA_FIFO); if (!rt2x00_get_field32(status, TX_STA_FIFO_VALID)) break; kfifo_put(&rt2x00dev->txstatus_fifo, status); - more = true; } - return more; + spin_unlock_irqrestore(&rt2x00dev->irqmask_lock, flags); } void rt2800mmio_txstatus_tasklet(unsigned long data) { struct rt2x00_dev *rt2x00dev = (struct rt2x00_dev *)data; - do { - rt2800mmio_txdone(rt2x00dev); + rt2800_txdone(rt2x00dev, 16); - } while (rt2800mmio_fetch_txstatus(rt2x00dev)); + if (!kfifo_is_empty(&rt2x00dev->txstatus_fifo)) + tasklet_schedule(&rt2x00dev->txstatus_tasklet); - if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags)) - rt2800mmio_enable_interrupt(rt2x00dev, - INT_SOURCE_CSR_TX_FIFO_STATUS); } EXPORT_SYMBOL_GPL(rt2800mmio_txstatus_tasklet); @@ -339,8 +311,10 @@ irqreturn_t rt2800mmio_interrupt(int irq, void *dev_instance) mask = ~reg; if (rt2x00_get_field32(reg, INT_SOURCE_CSR_TX_FIFO_STATUS)) { + rt2x00_set_field32(&mask, INT_MASK_CSR_TX_FIFO_STATUS, 1); rt2800mmio_fetch_txstatus(rt2x00dev); - tasklet_schedule(&rt2x00dev->txstatus_tasklet); + if (!kfifo_is_empty(&rt2x00dev->txstatus_fifo)) + tasklet_schedule(&rt2x00dev->txstatus_tasklet); } if (rt2x00_get_field32(reg, INT_SOURCE_CSR_PRE_TBTT)) @@ -440,6 +414,9 @@ void rt2800mmio_start_queue(struct data_queue *queue) } EXPORT_SYMBOL_GPL(rt2800mmio_start_queue); +/* 200 ms */ +#define TXSTATUS_TIMEOUT 200000000 + void rt2800mmio_kick_queue(struct data_queue *queue) { struct rt2x00_dev *rt2x00dev = queue->rt2x00dev; @@ -454,6 +431,8 @@ void rt2800mmio_kick_queue(struct data_queue *queue) entry = rt2x00queue_get_entry(queue, Q_INDEX); rt2x00mmio_register_write(rt2x00dev, TX_CTX_IDX(queue->qid), entry->entry_idx); + hrtimer_start(&rt2x00dev->txstatus_timer, + TXSTATUS_TIMEOUT, HRTIMER_MODE_REL); break; case QID_MGMT: entry = rt2x00queue_get_entry(queue, Q_INDEX); @@ -498,11 +477,8 @@ void rt2800mmio_flush_queue(struct data_queue *queue, bool drop) * For TX queues schedule completion tasklet to catch * tx status timeouts, othewise just wait. */ - if (tx_queue) { - tasklet_disable(&rt2x00dev->txstatus_tasklet); - rt2800mmio_txdone(rt2x00dev); - tasklet_enable(&rt2x00dev->txstatus_tasklet); - } + if (tx_queue) + queue_work(rt2x00dev->workqueue, &rt2x00dev->txdone_work); /* * Wait for a little while to give the driver @@ -640,6 +616,10 @@ void rt2800mmio_clear_entry(struct queue_entry *entry) word = rt2x00_desc_read(entry_priv->desc, 1); rt2x00_set_field32(&word, TXD_W1_DMA_DONE, 1); rt2x00_desc_write(entry_priv->desc, 1, word); + + /* If last entry stop txstatus timer */ + if (entry->queue->length == 1) + hrtimer_cancel(&rt2x00dev->txstatus_timer); } } EXPORT_SYMBOL_GPL(rt2800mmio_clear_entry); @@ -772,6 +752,70 @@ int rt2800mmio_enable_radio(struct rt2x00_dev *rt2x00dev) } EXPORT_SYMBOL_GPL(rt2800mmio_enable_radio); +static void rt2800mmio_work_txdone(struct work_struct *work) +{ + struct rt2x00_dev *rt2x00dev = + container_of(work, struct rt2x00_dev, txdone_work); + + if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags)) + return; + + while (!kfifo_is_empty(&rt2x00dev->txstatus_fifo) || + rt2800_txstatus_timeout(rt2x00dev)) { + + tasklet_disable(&rt2x00dev->txstatus_tasklet); + rt2800_txdone(rt2x00dev, UINT_MAX); + rt2800_txdone_nostatus(rt2x00dev); + tasklet_enable(&rt2x00dev->txstatus_tasklet); + } + + if (rt2800_txstatus_pending(rt2x00dev)) + hrtimer_start(&rt2x00dev->txstatus_timer, + TXSTATUS_TIMEOUT, HRTIMER_MODE_REL); +} + +static enum hrtimer_restart rt2800mmio_tx_sta_fifo_timeout(struct hrtimer *timer) +{ + struct rt2x00_dev *rt2x00dev = + container_of(timer, struct rt2x00_dev, txstatus_timer); + + if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags)) + goto out; + + if (!rt2800_txstatus_pending(rt2x00dev)) + goto out; + + rt2800mmio_fetch_txstatus(rt2x00dev); + if (!kfifo_is_empty(&rt2x00dev->txstatus_fifo)) + tasklet_schedule(&rt2x00dev->txstatus_tasklet); + else + queue_work(rt2x00dev->workqueue, &rt2x00dev->txdone_work); +out: + return HRTIMER_NORESTART; +} + +int rt2800mmio_probe_hw(struct rt2x00_dev *rt2x00dev) +{ + int retval; + + retval = rt2800_probe_hw(rt2x00dev); + if (retval) + return retval; + + /* + * Set txstatus timer function. + */ + rt2x00dev->txstatus_timer.function = rt2800mmio_tx_sta_fifo_timeout; + + /* + * Overwrite TX done handler + */ + INIT_WORK(&rt2x00dev->txdone_work, rt2800mmio_work_txdone); + + return 0; +} +EXPORT_SYMBOL_GPL(rt2800mmio_probe_hw); + MODULE_AUTHOR(DRV_PROJECT); MODULE_VERSION(DRV_VERSION); MODULE_DESCRIPTION("rt2800 MMIO library"); |