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Diffstat (limited to 'drivers/net/wireless/mediatek/mt76/sdio.c')
-rw-r--r--drivers/net/wireless/mediatek/mt76/sdio.c675
1 files changed, 675 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 000000000..fc4fb9463
--- /dev/null
+++ b/drivers/net/wireless/mediatek/mt76/sdio.c
@@ -0,0 +1,675 @@
+// 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/mmc/card.h>
+#include <linux/mmc/host.h>
+#include <linux/sched.h>
+#include <linux/kthread.h>
+
+#include "mt76.h"
+#include "sdio.h"
+
+static u32 mt76s_read_whisr(struct mt76_dev *dev)
+{
+ return sdio_readl(dev->sdio.func, MCR_WHISR, NULL);
+}
+
+u32 mt76s_read_pcr(struct mt76_dev *dev)
+{
+ struct mt76_sdio *sdio = &dev->sdio;
+
+ return sdio_readl(sdio->func, MCR_WHLPCR, NULL);
+}
+EXPORT_SYMBOL_GPL(mt76s_read_pcr);
+
+static u32 mt76s_read_mailbox(struct mt76_dev *dev, u32 offset)
+{
+ struct sdio_func *func = dev->sdio.func;
+ u32 val = ~0, status;
+ int err;
+
+ sdio_claim_host(func);
+
+ sdio_writel(func, offset, MCR_H2DSM0R, &err);
+ if (err < 0) {
+ dev_err(dev->dev, "failed setting address [err=%d]\n", err);
+ goto out;
+ }
+
+ sdio_writel(func, H2D_SW_INT_READ, MCR_WSICR, &err);
+ if (err < 0) {
+ dev_err(dev->dev, "failed setting read mode [err=%d]\n", err);
+ goto out;
+ }
+
+ err = readx_poll_timeout(mt76s_read_whisr, dev, status,
+ status & H2D_SW_INT_READ, 0, 1000000);
+ if (err < 0) {
+ dev_err(dev->dev, "query whisr timeout\n");
+ goto out;
+ }
+
+ sdio_writel(func, H2D_SW_INT_READ, MCR_WHISR, &err);
+ if (err < 0) {
+ dev_err(dev->dev, "failed setting read mode [err=%d]\n", err);
+ goto out;
+ }
+
+ val = sdio_readl(func, MCR_H2DSM0R, &err);
+ if (err < 0) {
+ dev_err(dev->dev, "failed reading h2dsm0r [err=%d]\n", err);
+ goto out;
+ }
+
+ if (val != offset) {
+ dev_err(dev->dev, "register mismatch\n");
+ val = ~0;
+ goto out;
+ }
+
+ val = sdio_readl(func, MCR_D2HRM1R, &err);
+ if (err < 0)
+ dev_err(dev->dev, "failed reading d2hrm1r [err=%d]\n", err);
+
+out:
+ sdio_release_host(func);
+
+ return val;
+}
+
+static void mt76s_write_mailbox(struct mt76_dev *dev, u32 offset, u32 val)
+{
+ struct sdio_func *func = dev->sdio.func;
+ u32 status;
+ int err;
+
+ sdio_claim_host(func);
+
+ sdio_writel(func, offset, MCR_H2DSM0R, &err);
+ if (err < 0) {
+ dev_err(dev->dev, "failed setting address [err=%d]\n", err);
+ goto out;
+ }
+
+ sdio_writel(func, val, MCR_H2DSM1R, &err);
+ if (err < 0) {
+ dev_err(dev->dev,
+ "failed setting write value [err=%d]\n", err);
+ goto out;
+ }
+
+ sdio_writel(func, H2D_SW_INT_WRITE, MCR_WSICR, &err);
+ if (err < 0) {
+ dev_err(dev->dev, "failed setting write mode [err=%d]\n", err);
+ goto out;
+ }
+
+ err = readx_poll_timeout(mt76s_read_whisr, dev, status,
+ status & H2D_SW_INT_WRITE, 0, 1000000);
+ if (err < 0) {
+ dev_err(dev->dev, "query whisr timeout\n");
+ goto out;
+ }
+
+ sdio_writel(func, H2D_SW_INT_WRITE, MCR_WHISR, &err);
+ if (err < 0) {
+ dev_err(dev->dev, "failed setting write mode [err=%d]\n", err);
+ goto out;
+ }
+
+ val = sdio_readl(func, MCR_H2DSM0R, &err);
+ if (err < 0) {
+ dev_err(dev->dev, "failed reading h2dsm0r [err=%d]\n", err);
+ goto out;
+ }
+
+ if (val != offset)
+ dev_err(dev->dev, "register mismatch\n");
+
+out:
+ sdio_release_host(func);
+}
+
+u32 mt76s_rr(struct mt76_dev *dev, u32 offset)
+{
+ if (test_bit(MT76_STATE_MCU_RUNNING, &dev->phy.state))
+ return dev->mcu_ops->mcu_rr(dev, offset);
+ else
+ return mt76s_read_mailbox(dev, offset);
+}
+EXPORT_SYMBOL_GPL(mt76s_rr);
+
+void mt76s_wr(struct mt76_dev *dev, u32 offset, u32 val)
+{
+ if (test_bit(MT76_STATE_MCU_RUNNING, &dev->phy.state))
+ dev->mcu_ops->mcu_wr(dev, offset, val);
+ else
+ mt76s_write_mailbox(dev, offset, val);
+}
+EXPORT_SYMBOL_GPL(mt76s_wr);
+
+u32 mt76s_rmw(struct mt76_dev *dev, u32 offset, u32 mask, u32 val)
+{
+ val |= mt76s_rr(dev, offset) & ~mask;
+ mt76s_wr(dev, offset, val);
+
+ return val;
+}
+EXPORT_SYMBOL_GPL(mt76s_rmw);
+
+void mt76s_write_copy(struct mt76_dev *dev, u32 offset,
+ const void *data, int len)
+{
+ const u32 *val = data;
+ int i;
+
+ for (i = 0; i < len / sizeof(u32); i++) {
+ mt76s_wr(dev, offset, val[i]);
+ offset += sizeof(u32);
+ }
+}
+EXPORT_SYMBOL_GPL(mt76s_write_copy);
+
+void mt76s_read_copy(struct mt76_dev *dev, u32 offset,
+ void *data, int len)
+{
+ u32 *val = data;
+ int i;
+
+ for (i = 0; i < len / sizeof(u32); i++) {
+ val[i] = mt76s_rr(dev, offset);
+ offset += sizeof(u32);
+ }
+}
+EXPORT_SYMBOL_GPL(mt76s_read_copy);
+
+int mt76s_wr_rp(struct mt76_dev *dev, u32 base,
+ const struct mt76_reg_pair *data,
+ int len)
+{
+ int i;
+
+ for (i = 0; i < len; i++) {
+ mt76s_wr(dev, data->reg, data->value);
+ data++;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(mt76s_wr_rp);
+
+int mt76s_rd_rp(struct mt76_dev *dev, u32 base,
+ struct mt76_reg_pair *data, int len)
+{
+ int i;
+
+ for (i = 0; i < len; i++) {
+ data->value = mt76s_rr(dev, data->reg);
+ data++;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(mt76s_rd_rp);
+
+int mt76s_hw_init(struct mt76_dev *dev, struct sdio_func *func, int hw_ver)
+{
+ u32 status, ctrl;
+ int ret;
+
+ dev->sdio.hw_ver = hw_ver;
+
+ sdio_claim_host(func);
+
+ ret = sdio_enable_func(func);
+ if (ret < 0)
+ goto release;
+
+ /* Get ownership from the device */
+ sdio_writel(func, WHLPCR_INT_EN_CLR | WHLPCR_FW_OWN_REQ_CLR,
+ MCR_WHLPCR, &ret);
+ if (ret < 0)
+ goto disable_func;
+
+ ret = readx_poll_timeout(mt76s_read_pcr, dev, status,
+ status & WHLPCR_IS_DRIVER_OWN, 2000, 1000000);
+ if (ret < 0) {
+ dev_err(dev->dev, "Cannot get ownership from device");
+ goto disable_func;
+ }
+
+ ret = sdio_set_block_size(func, 512);
+ if (ret < 0)
+ goto disable_func;
+
+ /* Enable interrupt */
+ sdio_writel(func, WHLPCR_INT_EN_SET, MCR_WHLPCR, &ret);
+ if (ret < 0)
+ goto disable_func;
+
+ ctrl = WHIER_RX0_DONE_INT_EN | WHIER_TX_DONE_INT_EN;
+ if (hw_ver == MT76_CONNAC2_SDIO)
+ ctrl |= WHIER_RX1_DONE_INT_EN;
+ sdio_writel(func, ctrl, MCR_WHIER, &ret);
+ if (ret < 0)
+ goto disable_func;
+
+ switch (hw_ver) {
+ case MT76_CONNAC_SDIO:
+ /* set WHISR as read clear and Rx aggregation number as 16 */
+ ctrl = FIELD_PREP(MAX_HIF_RX_LEN_NUM, 16);
+ break;
+ default:
+ ctrl = sdio_readl(func, MCR_WHCR, &ret);
+ if (ret < 0)
+ goto disable_func;
+ ctrl &= ~MAX_HIF_RX_LEN_NUM_CONNAC2;
+ ctrl &= ~W_INT_CLR_CTRL; /* read clear */
+ ctrl |= FIELD_PREP(MAX_HIF_RX_LEN_NUM_CONNAC2, 0);
+ break;
+ }
+
+ sdio_writel(func, ctrl, MCR_WHCR, &ret);
+ if (ret < 0)
+ goto disable_func;
+
+ ret = sdio_claim_irq(func, mt76s_sdio_irq);
+ if (ret < 0)
+ goto disable_func;
+
+ sdio_release_host(func);
+
+ return 0;
+
+disable_func:
+ sdio_disable_func(func);
+release:
+ sdio_release_host(func);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(mt76s_hw_init);
+
+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,
+ MT76S_NUM_RX_ENTRIES, sizeof(*q->entry),
+ GFP_KERNEL);
+ if (!q->entry)
+ return -ENOMEM;
+
+ q->ndesc = MT76S_NUM_RX_ENTRIES;
+ q->head = q->tail = 0;
+ q->queued = 0;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(mt76s_alloc_rx_queue);
+
+static struct mt76_queue *mt76s_alloc_tx_queue(struct mt76_dev *dev)
+{
+ struct mt76_queue *q;
+
+ q = devm_kzalloc(dev->dev, sizeof(*q), GFP_KERNEL);
+ if (!q)
+ return ERR_PTR(-ENOMEM);
+
+ spin_lock_init(&q->lock);
+ q->entry = devm_kcalloc(dev->dev,
+ MT76S_NUM_TX_ENTRIES, sizeof(*q->entry),
+ GFP_KERNEL);
+ if (!q->entry)
+ return ERR_PTR(-ENOMEM);
+
+ q->ndesc = MT76S_NUM_TX_ENTRIES;
+
+ return q;
+}
+
+int mt76s_alloc_tx(struct mt76_dev *dev)
+{
+ struct mt76_queue *q;
+ int i;
+
+ for (i = 0; i <= MT_TXQ_PSD; i++) {
+ q = mt76s_alloc_tx_queue(dev);
+ if (IS_ERR(q))
+ return PTR_ERR(q);
+
+ dev->phy.q_tx[i] = q;
+ }
+
+ q = mt76s_alloc_tx_queue(dev);
+ if (IS_ERR(q))
+ return PTR_ERR(q);
+
+ dev->q_mcu[MT_MCUQ_WM] = q;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(mt76s_alloc_tx);
+
+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->tail];
+ q->tail = (q->tail + 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 void mt76s_net_worker(struct mt76_worker *w)
+{
+ struct mt76_sdio *sdio = container_of(w, struct mt76_sdio,
+ net_worker);
+ struct mt76_dev *dev = container_of(sdio, struct mt76_dev, sdio);
+ int i, nframes;
+
+ do {
+ nframes = 0;
+
+ 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();
+ } while (nframes > 0);
+}
+
+static int mt76s_process_tx_queue(struct mt76_dev *dev, struct mt76_queue *q)
+{
+ struct mt76_queue_entry entry;
+ int nframes = 0;
+ bool mcu;
+
+ if (!q)
+ return 0;
+
+ mcu = q == dev->q_mcu[MT_MCUQ_WM];
+ while (q->queued > 0) {
+ if (!q->entry[q->tail].done)
+ break;
+
+ entry = q->entry[q->tail];
+ q->entry[q->tail].done = false;
+
+ if (mcu) {
+ dev_kfree_skb(entry.skb);
+ entry.skb = NULL;
+ }
+
+ mt76_queue_tx_complete(dev, q, &entry);
+ nframes++;
+ }
+
+ if (!q->queued)
+ wake_up(&dev->tx_wait);
+
+ return nframes;
+}
+
+static void mt76s_status_worker(struct mt76_worker *w)
+{
+ struct mt76_sdio *sdio = container_of(w, struct mt76_sdio,
+ status_worker);
+ struct mt76_dev *dev = container_of(sdio, struct mt76_dev, sdio);
+ bool resched = false;
+ int i, nframes;
+
+ do {
+ int ndata_frames = 0;
+
+ nframes = mt76s_process_tx_queue(dev, dev->q_mcu[MT_MCUQ_WM]);
+
+ for (i = 0; i <= MT_TXQ_PSD; i++)
+ ndata_frames += mt76s_process_tx_queue(dev,
+ dev->phy.q_tx[i]);
+ nframes += ndata_frames;
+ if (ndata_frames > 0)
+ resched = true;
+
+ if (dev->drv->tx_status_data && ndata_frames > 0 &&
+ !test_and_set_bit(MT76_READING_STATS, &dev->phy.state) &&
+ !test_bit(MT76_STATE_SUSPEND, &dev->phy.state))
+ mt76_worker_schedule(&sdio->stat_worker);
+ } while (nframes > 0);
+
+ if (resched)
+ mt76_worker_schedule(&dev->tx_worker);
+}
+
+static void mt76s_tx_status_data(struct mt76_worker *worker)
+{
+ struct mt76_sdio *sdio;
+ struct mt76_dev *dev;
+ u8 update = 1;
+ u16 count = 0;
+
+ sdio = container_of(worker, struct mt76_sdio, stat_worker);
+ 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))
+ mt76_worker_schedule(&sdio->status_worker);
+ else
+ clear_bit(MT76_READING_STATS, &dev->phy.state);
+}
+
+static int
+mt76s_tx_queue_skb(struct mt76_dev *dev, struct mt76_queue *q,
+ enum mt76_txq_id qid, struct sk_buff *skb,
+ struct mt76_wcid *wcid, struct ieee80211_sta *sta)
+{
+ struct mt76_tx_info tx_info = {
+ .skb = skb,
+ };
+ int err, len = skb->len;
+ u16 idx = q->head;
+
+ 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->head].skb = tx_info.skb;
+ q->entry[q->head].buf_sz = len;
+ q->entry[q->head].wcid = 0xffff;
+
+ smp_wmb();
+
+ q->head = (q->head + 1) % q->ndesc;
+ q->queued++;
+
+ return idx;
+}
+
+static int
+mt76s_tx_queue_skb_raw(struct mt76_dev *dev, struct mt76_queue *q,
+ struct sk_buff *skb, u32 tx_info)
+{
+ int ret = -ENOSPC, len = skb->len, pad;
+
+ if (q->queued == q->ndesc)
+ goto error;
+
+ pad = round_up(skb->len, 4) - skb->len;
+ ret = mt76_skb_adjust_pad(skb, pad);
+ if (ret)
+ goto error;
+
+ spin_lock_bh(&q->lock);
+
+ q->entry[q->head].buf_sz = len;
+ q->entry[q->head].skb = skb;
+
+ /* ensure the entry fully updated before bus access */
+ smp_wmb();
+
+ q->head = (q->head + 1) % q->ndesc;
+ q->queued++;
+
+ spin_unlock_bh(&q->lock);
+
+ return 0;
+
+error:
+ dev_kfree_skb(skb);
+
+ return ret;
+}
+
+static void mt76s_tx_kick(struct mt76_dev *dev, struct mt76_queue *q)
+{
+ struct mt76_sdio *sdio = &dev->sdio;
+
+ mt76_worker_schedule(&sdio->txrx_worker);
+}
+
+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,
+};
+
+void mt76s_deinit(struct mt76_dev *dev)
+{
+ struct mt76_sdio *sdio = &dev->sdio;
+ int i;
+
+ mt76_worker_teardown(&sdio->txrx_worker);
+ mt76_worker_teardown(&sdio->status_worker);
+ mt76_worker_teardown(&sdio->net_worker);
+ mt76_worker_teardown(&sdio->stat_worker);
+
+ clear_bit(MT76_READING_STATS, &dev->phy.state);
+
+ mt76_tx_status_check(dev, true);
+
+ 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;
+ u32 host_max_cap;
+ int err;
+
+ err = mt76_worker_setup(dev->hw, &sdio->status_worker,
+ mt76s_status_worker, "sdio-status");
+ if (err)
+ return err;
+
+ err = mt76_worker_setup(dev->hw, &sdio->net_worker, mt76s_net_worker,
+ "sdio-net");
+ if (err)
+ return err;
+
+ err = mt76_worker_setup(dev->hw, &sdio->stat_worker, mt76s_tx_status_data,
+ "sdio-sta");
+ if (err)
+ return err;
+
+ sched_set_fifo_low(sdio->status_worker.task);
+ sched_set_fifo_low(sdio->net_worker.task);
+ sched_set_fifo_low(sdio->stat_worker.task);
+
+ dev->queue_ops = &sdio_queue_ops;
+ dev->bus = bus_ops;
+ dev->sdio.func = func;
+
+ host_max_cap = min_t(u32, func->card->host->max_req_size,
+ func->cur_blksize *
+ func->card->host->max_blk_count);
+ dev->sdio.xmit_buf_sz = min_t(u32, host_max_cap, MT76S_XMIT_BUF_SZ);
+ dev->sdio.xmit_buf = devm_kmalloc(dev->dev, dev->sdio.xmit_buf_sz,
+ GFP_KERNEL);
+ if (!dev->sdio.xmit_buf)
+ err = -ENOMEM;
+
+ return err;
+}
+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");
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-06 19:26:24 +0000