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author | Sean Wang <sean.wang@mediatek.com> | 2020-07-15 14:46:30 +0200 |
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committer | Felix Fietkau <nbd@nbd.name> | 2020-07-21 19:01:18 +0200 |
commit | d39b52e31aa641c79d0a1177f9d02e71d1b7fd64 (patch) | |
tree | a5f8b7c2df28b83d59487162943f3d017f59975e /drivers/net/wireless/mediatek/mt76/sdio.c | |
parent | 90520afbae5f01c67f6b7ad580e0de90adab21a6 (diff) | |
download | linux-stable-d39b52e31aa641c79d0a1177f9d02e71d1b7fd64.tar.gz linux-stable-d39b52e31aa641c79d0a1177f9d02e71d1b7fd64.tar.bz2 linux-stable-d39b52e31aa641c79d0a1177f9d02e71d1b7fd64.zip |
mt76: introduce mt76_sdio module
Introduce mt76_sdio module as common layer to add mt7663s support
Co-developed-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Diffstat (limited to 'drivers/net/wireless/mediatek/mt76/sdio.c')
-rw-r--r-- | drivers/net/wireless/mediatek/mt76/sdio.c | 363 |
1 files changed, 363 insertions, 0 deletions
diff --git a/drivers/net/wireless/mediatek/mt76/sdio.c b/drivers/net/wireless/mediatek/mt76/sdio.c new file mode 100644 index 000000000000..a6f3255c4d84 --- /dev/null +++ b/drivers/net/wireless/mediatek/mt76/sdio.c @@ -0,0 +1,363 @@ +// SPDX-License-Identifier: ISC +/* Copyright (C) 2020 MediaTek Inc. + * + * This file is written based on mt76/usb.c. + * + * Author: Felix Fietkau <nbd@nbd.name> + * Lorenzo Bianconi <lorenzo@kernel.org> + * Sean Wang <sean.wang@mediatek.com> + */ + +#include <linux/iopoll.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/mmc/sdio_func.h> +#include <linux/sched.h> +#include <linux/kthread.h> + +#include "mt76.h" + +static int +mt76s_alloc_rx_queue(struct mt76_dev *dev, enum mt76_rxq_id qid) +{ + struct mt76_queue *q = &dev->q_rx[qid]; + + spin_lock_init(&q->lock); + q->entry = devm_kcalloc(dev->dev, + MT_NUM_RX_ENTRIES, sizeof(*q->entry), + GFP_KERNEL); + if (!q->entry) + return -ENOMEM; + + q->ndesc = MT_NUM_RX_ENTRIES; + q->head = q->tail = 0; + q->queued = 0; + + return 0; +} + +static int mt76s_alloc_tx(struct mt76_dev *dev) +{ + struct mt76_queue *q; + int i; + + for (i = 0; i < MT_TXQ_MCU_WA; i++) { + INIT_LIST_HEAD(&dev->q_tx[i].swq); + + q = devm_kzalloc(dev->dev, sizeof(*q), GFP_KERNEL); + if (!q) + return -ENOMEM; + + spin_lock_init(&q->lock); + q->hw_idx = i; + dev->q_tx[i].q = q; + + q->entry = devm_kcalloc(dev->dev, + MT_NUM_TX_ENTRIES, sizeof(*q->entry), + GFP_KERNEL); + if (!q->entry) + return -ENOMEM; + + q->ndesc = MT_NUM_TX_ENTRIES; + } + + return 0; +} + +void mt76s_stop_txrx(struct mt76_dev *dev) +{ + struct mt76_sdio *sdio = &dev->sdio; + + cancel_work_sync(&sdio->stat_work); + clear_bit(MT76_READING_STATS, &dev->phy.state); + + mt76_tx_status_check(dev, NULL, true); +} +EXPORT_SYMBOL_GPL(mt76s_stop_txrx); + +int mt76s_alloc_queues(struct mt76_dev *dev) +{ + int err; + + err = mt76s_alloc_rx_queue(dev, MT_RXQ_MAIN); + if (err < 0) + return err; + + return mt76s_alloc_tx(dev); +} +EXPORT_SYMBOL_GPL(mt76s_alloc_queues); + +static struct mt76_queue_entry * +mt76s_get_next_rx_entry(struct mt76_queue *q) +{ + struct mt76_queue_entry *e = NULL; + + spin_lock_bh(&q->lock); + if (q->queued > 0) { + e = &q->entry[q->head]; + q->head = (q->head + 1) % q->ndesc; + q->queued--; + } + spin_unlock_bh(&q->lock); + + return e; +} + +static int +mt76s_process_rx_queue(struct mt76_dev *dev, struct mt76_queue *q) +{ + int qid = q - &dev->q_rx[MT_RXQ_MAIN]; + int nframes = 0; + + while (true) { + struct mt76_queue_entry *e; + + if (!test_bit(MT76_STATE_INITIALIZED, &dev->phy.state)) + break; + + e = mt76s_get_next_rx_entry(q); + if (!e || !e->skb) + break; + + dev->drv->rx_skb(dev, MT_RXQ_MAIN, e->skb); + e->skb = NULL; + nframes++; + } + if (qid == MT_RXQ_MAIN) + mt76_rx_poll_complete(dev, MT_RXQ_MAIN, NULL); + + return nframes; +} + +static int mt76s_process_tx_queue(struct mt76_dev *dev, enum mt76_txq_id qid) +{ + struct mt76_sw_queue *sq = &dev->q_tx[qid]; + u32 n_dequeued = 0, n_sw_dequeued = 0; + struct mt76_queue_entry entry; + struct mt76_queue *q = sq->q; + bool wake; + + while (q->queued > n_dequeued) { + if (q->entry[q->head].schedule) { + q->entry[q->head].schedule = false; + n_sw_dequeued++; + } + + entry = q->entry[q->head]; + q->entry[q->head].done = false; + q->head = (q->head + 1) % q->ndesc; + n_dequeued++; + + if (qid == MT_TXQ_MCU) + dev_kfree_skb(entry.skb); + else + dev->drv->tx_complete_skb(dev, qid, &entry); + } + + spin_lock_bh(&q->lock); + + sq->swq_queued -= n_sw_dequeued; + q->queued -= n_dequeued; + + wake = q->stopped && q->queued < q->ndesc - 8; + if (wake) + q->stopped = false; + + if (!q->queued) + wake_up(&dev->tx_wait); + + spin_unlock_bh(&q->lock); + + if (qid == MT_TXQ_MCU) + goto out; + + mt76_txq_schedule(&dev->phy, qid); + + if (wake) + ieee80211_wake_queue(dev->hw, qid); + + wake_up_process(dev->sdio.tx_kthread); +out: + return n_dequeued; +} + +static void mt76s_tx_status_data(struct work_struct *work) +{ + struct mt76_sdio *sdio; + struct mt76_dev *dev; + u8 update = 1; + u16 count = 0; + + sdio = container_of(work, struct mt76_sdio, stat_work); + dev = container_of(sdio, struct mt76_dev, sdio); + + while (true) { + if (test_bit(MT76_REMOVED, &dev->phy.state)) + break; + + if (!dev->drv->tx_status_data(dev, &update)) + break; + count++; + } + + if (count && test_bit(MT76_STATE_RUNNING, &dev->phy.state)) + queue_work(dev->wq, &sdio->stat_work); + else + clear_bit(MT76_READING_STATS, &dev->phy.state); +} + +static int +mt76s_tx_queue_skb(struct mt76_dev *dev, enum mt76_txq_id qid, + struct sk_buff *skb, struct mt76_wcid *wcid, + struct ieee80211_sta *sta) +{ + struct mt76_queue *q = dev->q_tx[qid].q; + struct mt76_tx_info tx_info = { + .skb = skb, + }; + int err, len = skb->len; + u16 idx = q->tail; + + if (q->queued == q->ndesc) + return -ENOSPC; + + skb->prev = skb->next = NULL; + err = dev->drv->tx_prepare_skb(dev, NULL, qid, wcid, sta, &tx_info); + if (err < 0) + return err; + + q->entry[q->tail].skb = tx_info.skb; + q->entry[q->tail].buf_sz = len; + q->tail = (q->tail + 1) % q->ndesc; + + return idx; +} + +static int +mt76s_tx_queue_skb_raw(struct mt76_dev *dev, enum mt76_txq_id qid, + struct sk_buff *skb, u32 tx_info) +{ + struct mt76_queue *q = dev->q_tx[qid].q; + int ret = -ENOSPC, len = skb->len; + + spin_lock_bh(&q->lock); + if (q->queued == q->ndesc) + goto out; + + ret = mt76_skb_adjust_pad(skb); + if (ret) + goto out; + + q->entry[q->tail].buf_sz = len; + q->entry[q->tail].skb = skb; + q->tail = (q->tail + 1) % q->ndesc; + +out: + spin_unlock_bh(&q->lock); + + return ret; +} + +static void mt76s_tx_kick(struct mt76_dev *dev, struct mt76_queue *q) +{ + struct mt76_sdio *sdio = &dev->sdio; + + wake_up_process(sdio->tx_kthread); +} + +static const struct mt76_queue_ops sdio_queue_ops = { + .tx_queue_skb = mt76s_tx_queue_skb, + .kick = mt76s_tx_kick, + .tx_queue_skb_raw = mt76s_tx_queue_skb_raw, +}; + +static int mt76s_kthread_run(void *data) +{ + struct mt76_dev *dev = data; + struct mt76_phy *mphy = &dev->phy; + + while (!kthread_should_stop()) { + int i, nframes = 0; + + cond_resched(); + + /* rx processing */ + local_bh_disable(); + rcu_read_lock(); + + mt76_for_each_q_rx(dev, i) + nframes += mt76s_process_rx_queue(dev, &dev->q_rx[i]); + + rcu_read_unlock(); + local_bh_enable(); + + /* tx processing */ + for (i = 0; i < MT_TXQ_MCU_WA; i++) + nframes += mt76s_process_tx_queue(dev, i); + + if (dev->drv->tx_status_data && + !test_and_set_bit(MT76_READING_STATS, &mphy->state)) + queue_work(dev->wq, &dev->sdio.stat_work); + + if (!nframes || !test_bit(MT76_STATE_RUNNING, &mphy->state)) { + set_current_state(TASK_INTERRUPTIBLE); + schedule(); + } + } + + return 0; +} + +void mt76s_deinit(struct mt76_dev *dev) +{ + struct mt76_sdio *sdio = &dev->sdio; + int i; + + kthread_stop(sdio->kthread); + kthread_stop(sdio->tx_kthread); + mt76s_stop_txrx(dev); + + sdio_claim_host(sdio->func); + sdio_release_irq(sdio->func); + sdio_release_host(sdio->func); + + mt76_for_each_q_rx(dev, i) { + struct mt76_queue *q = &dev->q_rx[i]; + int j; + + for (j = 0; j < q->ndesc; j++) { + struct mt76_queue_entry *e = &q->entry[j]; + + if (!e->skb) + continue; + + dev_kfree_skb(e->skb); + e->skb = NULL; + } + } +} +EXPORT_SYMBOL_GPL(mt76s_deinit); + +int mt76s_init(struct mt76_dev *dev, struct sdio_func *func, + const struct mt76_bus_ops *bus_ops) +{ + struct mt76_sdio *sdio = &dev->sdio; + + sdio->kthread = kthread_create(mt76s_kthread_run, dev, "mt76s"); + if (IS_ERR(sdio->kthread)) + return PTR_ERR(sdio->kthread); + + INIT_WORK(&sdio->stat_work, mt76s_tx_status_data); + + mutex_init(&sdio->sched.lock); + dev->queue_ops = &sdio_queue_ops; + dev->bus = bus_ops; + dev->sdio.func = func; + + return 0; +} +EXPORT_SYMBOL_GPL(mt76s_init); + +MODULE_AUTHOR("Sean Wang <sean.wang@mediatek.com>"); +MODULE_AUTHOR("Lorenzo Bianconi <lorenzo@kernel.org>"); +MODULE_LICENSE("Dual BSD/GPL"); |