drivers/net/wireless/mediatek/mt76/mt7615/sdio_txrx.c - third_party/kernel - Git at Google

 // SPDX-License-Identifier: ISC
 /* Copyright (C) 2020 MediaTek Inc.
  *
  * Author: Felix Fietkau <nbd@nbd.name>
  *	   Lorenzo Bianconi <lorenzo@kernel.org>
  *	   Sean Wang <sean.wang@mediatek.com>
  */

 #include <linux/kernel.h>
 #include <linux/iopoll.h>
 #include <linux/module.h>

 #include <linux/mmc/host.h>
 #include <linux/mmc/sdio_ids.h>
 #include <linux/mmc/sdio_func.h>

 #include "../trace.h"
 #include "mt7615.h"
 #include "sdio.h"
 #include "mac.h"

 static int mt7663s_refill_sched_quota(struct mt76_dev *dev, u32 *data)
 {
 	u32 ple_ac_data_quota[] = {
 		FIELD_GET(TXQ_CNT_L, data[4]), /* VO */
 		FIELD_GET(TXQ_CNT_H, data[3]), /* VI */
 		FIELD_GET(TXQ_CNT_L, data[3]), /* BE */
 		FIELD_GET(TXQ_CNT_H, data[2]), /* BK */
 	};
 	u32 pse_ac_data_quota[] = {
 		FIELD_GET(TXQ_CNT_H, data[1]), /* VO */
 		FIELD_GET(TXQ_CNT_L, data[1]), /* VI */
 		FIELD_GET(TXQ_CNT_H, data[0]), /* BE */
 		FIELD_GET(TXQ_CNT_L, data[0]), /* BK */
 	};
 	u32 pse_mcu_quota = FIELD_GET(TXQ_CNT_L, data[2]);
 	u32 pse_data_quota = 0, ple_data_quota = 0;
 	struct mt76_sdio *sdio = &dev->sdio;
 	int i;

 	for (i = 0; i < ARRAY_SIZE(pse_ac_data_quota); i++) {
 		pse_data_quota += pse_ac_data_quota[i];
 		ple_data_quota += ple_ac_data_quota[i];
 	}

 	if (!pse_data_quota && !ple_data_quota && !pse_mcu_quota)
 		return 0;

 	mutex_lock(&sdio->sched.lock);
 	sdio->sched.pse_mcu_quota += pse_mcu_quota;
 	sdio->sched.pse_data_quota += pse_data_quota;
 	sdio->sched.ple_data_quota += ple_data_quota;
 	mutex_unlock(&sdio->sched.lock);

 	return pse_data_quota + ple_data_quota + pse_mcu_quota;
 }

 static struct sk_buff *mt7663s_build_rx_skb(void *data, int data_len,
 					    int buf_len)
 {
 	int len = min_t(int, data_len, MT_SKB_HEAD_LEN);
 	struct sk_buff *skb;

 	skb = alloc_skb(len, GFP_KERNEL);
 	if (!skb)
 		return NULL;

 	skb_put_data(skb, data, len);
 	if (data_len > len) {
 		struct page *page;

 		data += len;
 		page = virt_to_head_page(data);
 		skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
 				page, data - page_address(page),
 				data_len - len, buf_len);
 		get_page(page);
 	}

 	return skb;
 }

 static int mt7663s_rx_run_queue(struct mt76_dev *dev, enum mt76_rxq_id qid,
 				struct mt76s_intr *intr)
 {
 	struct mt76_queue *q = &dev->q_rx[qid];
 	struct mt76_sdio *sdio = &dev->sdio;
 	int len = 0, err, i;
 	struct page *page;
 	u8 *buf;

 	for (i = 0; i < intr->rx.num[qid]; i++)
 		len += round_up(intr->rx.len[qid][i] + 4, 4);

 	if (!len)
 		return 0;

 	if (len > sdio->func->cur_blksize)
 		len = roundup(len, sdio->func->cur_blksize);

 	page = __dev_alloc_pages(GFP_KERNEL, get_order(len));
 	if (!page)
 		return -ENOMEM;

 	buf = page_address(page);

 	sdio_claim_host(sdio->func);
 	err = sdio_readsb(sdio->func, buf, MCR_WRDR(qid), len);
 	sdio_release_host(sdio->func);

 	if (err < 0) {
 		dev_err(dev->dev, "sdio read data failed:%d\n", err);
 		put_page(page);
 		return err;
 	}

 	for (i = 0; i < intr->rx.num[qid]; i++) {
 		int index = (q->head + i) % q->ndesc;
 		struct mt76_queue_entry *e = &q->entry[index];

 		len = intr->rx.len[qid][i];
 		e->skb = mt7663s_build_rx_skb(buf, len, round_up(len + 4, 4));
 		if (!e->skb)
 			break;

 		buf += round_up(len + 4, 4);
 		if (q->queued + i + 1 == q->ndesc)
 			break;
 	}
 	put_page(page);

 	spin_lock_bh(&q->lock);
 	q->head = (q->head + i) % q->ndesc;
 	q->queued += i;
 	spin_unlock_bh(&q->lock);

 	return i;
 }

 static int mt7663s_tx_pick_quota(struct mt76_sdio *sdio, enum mt76_txq_id qid,
 				 int buf_sz, int *pse_size, int *ple_size)
 {
 	int pse_sz;

 	pse_sz = DIV_ROUND_UP(buf_sz + sdio->sched.deficit, MT_PSE_PAGE_SZ);

 	if (qid == MT_TXQ_MCU) {
 		if (sdio->sched.pse_mcu_quota < *pse_size + pse_sz)
 			return -EBUSY;
 	} else {
 		if (sdio->sched.pse_data_quota < *pse_size + pse_sz ||
 		    sdio->sched.ple_data_quota < *ple_size + 1)
 			return -EBUSY;

 		*ple_size = *ple_size + 1;
 	}
 	*pse_size = *pse_size + pse_sz;

 	return 0;
 }

 static void mt7663s_tx_update_quota(struct mt76_sdio *sdio, enum mt76_txq_id qid,
 				    int pse_size, int ple_size)
 {
 	mutex_lock(&sdio->sched.lock);
 	if (qid == MT_TXQ_MCU) {
 		sdio->sched.pse_mcu_quota -= pse_size;
 	} else {
 		sdio->sched.pse_data_quota -= pse_size;
 		sdio->sched.ple_data_quota -= ple_size;
 	}
 	mutex_unlock(&sdio->sched.lock);
 }

 static int __mt7663s_xmit_queue(struct mt76_dev *dev, u8 *data, int len)
 {
 	struct mt76_sdio *sdio = &dev->sdio;
 	int err;

 	if (len > sdio->func->cur_blksize)
 		len = roundup(len, sdio->func->cur_blksize);

 	sdio_claim_host(sdio->func);
 	err = sdio_writesb(sdio->func, MCR_WTDR1, data, len);
 	sdio_release_host(sdio->func);

 	if (err)
 		dev_err(dev->dev, "sdio write failed: %d\n", err);

 	return err;
 }

 static int mt7663s_tx_run_queue(struct mt76_dev *dev, enum mt76_txq_id qid)
 {
 	int err, nframes = 0, len = 0, pse_sz = 0, ple_sz = 0;
 	struct mt76_queue *q = dev->q_tx[qid];
 	struct mt76_sdio *sdio = &dev->sdio;

 	while (q->first != q->head) {
 		struct mt76_queue_entry *e = &q->entry[q->first];
 		struct sk_buff *iter;

 		if (!test_bit(MT76_STATE_MCU_RUNNING, &dev->phy.state)) {
 			__skb_put_zero(e->skb, 4);
 			err = __mt7663s_xmit_queue(dev, e->skb->data,
 						   e->skb->len);
 			if (err)
 				return err;

 			goto next;
 		}

 		if (len + e->skb->len + 4 > MT76S_XMIT_BUF_SZ)
 			break;

 		if (mt7663s_tx_pick_quota(sdio, qid, e->buf_sz, &pse_sz,
 					  &ple_sz))
 			break;

 		memcpy(sdio->xmit_buf[qid] + len, e->skb->data,
 		       skb_headlen(e->skb));
 		len += skb_headlen(e->skb);
 		nframes++;

 		skb_walk_frags(e->skb, iter) {
 			memcpy(sdio->xmit_buf[qid] + len, iter->data,
 			       iter->len);
 			len += iter->len;
 			nframes++;
 		}
 next:
 		q->first = (q->first + 1) % q->ndesc;
 		e->done = true;
 	}

 	if (nframes) {
 		memset(sdio->xmit_buf[qid] + len, 0, 4);
 		err = __mt7663s_xmit_queue(dev, sdio->xmit_buf[qid], len + 4);
 		if (err)
 			return err;
 	}
 	mt7663s_tx_update_quota(sdio, qid, pse_sz, ple_sz);

 	return nframes;
 }

 void mt7663s_tx_work(struct work_struct *work)
 {
 	struct mt76_sdio *sdio = container_of(work, struct mt76_sdio,
 					      tx.xmit_work);
 	struct mt76_dev *dev = container_of(sdio, struct mt76_dev, sdio);
 	int i, nframes = 0;

 	for (i = 0; i < MT_TXQ_MCU_WA; i++) {
 		int ret;

 		ret = mt7663s_tx_run_queue(dev, i);
 		if (ret < 0)
 			break;

 		nframes += ret;
 	}
 	if (nframes)
 		queue_work(sdio->txrx_wq, &sdio->tx.xmit_work);

 	queue_work(sdio->txrx_wq, &sdio->tx.status_work);
 }

 void mt7663s_rx_work(struct work_struct *work)
 {
 	struct mt76_sdio *sdio = container_of(work, struct mt76_sdio,
 					      rx.recv_work);
 	struct mt76_dev *dev = container_of(sdio, struct mt76_dev, sdio);
 	struct mt76s_intr *intr = sdio->intr_data;
 	int nframes = 0, ret;

 	/* disable interrupt */
 	sdio_claim_host(sdio->func);
 	sdio_writel(sdio->func, WHLPCR_INT_EN_CLR, MCR_WHLPCR, NULL);
 	ret = sdio_readsb(sdio->func, intr, MCR_WHISR, sizeof(*intr));
 	sdio_release_host(sdio->func);

 	if (ret < 0)
 		goto out;

 	trace_dev_irq(dev, intr->isr, 0);

 	if (intr->isr & WHIER_RX0_DONE_INT_EN) {
 		ret = mt7663s_rx_run_queue(dev, 0, intr);
 		if (ret > 0) {
 			queue_work(sdio->txrx_wq, &sdio->rx.net_work);
 			nframes += ret;
 		}
 	}

 	if (intr->isr & WHIER_RX1_DONE_INT_EN) {
 		ret = mt7663s_rx_run_queue(dev, 1, intr);
 		if (ret > 0) {
 			queue_work(sdio->txrx_wq, &sdio->rx.net_work);
 			nframes += ret;
 		}
 	}

 	if (mt7663s_refill_sched_quota(dev, intr->tx.wtqcr))
 		queue_work(sdio->txrx_wq, &sdio->tx.xmit_work);

 	if (nframes) {
 		queue_work(sdio->txrx_wq, &sdio->rx.recv_work);
 		return;
 	}
 out:
 	/* enable interrupt */
 	sdio_claim_host(sdio->func);
 	sdio_writel(sdio->func, WHLPCR_INT_EN_SET, MCR_WHLPCR, NULL);
 	sdio_release_host(sdio->func);
 }

 void mt7663s_sdio_irq(struct sdio_func *func)
 {
 	struct mt7615_dev *dev = sdio_get_drvdata(func);
 	struct mt76_sdio *sdio = &dev->mt76.sdio;

 	if (!test_bit(MT76_STATE_INITIALIZED, &dev->mt76.phy.state))
 		return;

 	queue_work(sdio->txrx_wq, &sdio->rx.recv_work);
 }
	// SPDX-License-Identifier: ISC
	/* Copyright (C) 2020 MediaTek Inc.
	*
	* Author: Felix Fietkau <nbd@nbd.name>
	* Lorenzo Bianconi <lorenzo@kernel.org>
	* Sean Wang <sean.wang@mediatek.com>
	*/

	#include <linux/kernel.h>
	#include <linux/iopoll.h>
	#include <linux/module.h>

	#include <linux/mmc/host.h>
	#include <linux/mmc/sdio_ids.h>
	#include <linux/mmc/sdio_func.h>

	#include "../trace.h"
	#include "mt7615.h"
	#include "sdio.h"
	#include "mac.h"

	static int mt7663s_refill_sched_quota(struct mt76_dev dev, u32 data)
	{
	u32 ple_ac_data_quota[] = {
	FIELD_GET(TXQ_CNT_L, data[4]), /* VO */
	FIELD_GET(TXQ_CNT_H, data[3]), /* VI */
	FIELD_GET(TXQ_CNT_L, data[3]), /* BE */
	FIELD_GET(TXQ_CNT_H, data[2]), /* BK */
	};
	u32 pse_ac_data_quota[] = {
	FIELD_GET(TXQ_CNT_H, data[1]), /* VO */
	FIELD_GET(TXQ_CNT_L, data[1]), /* VI */
	FIELD_GET(TXQ_CNT_H, data[0]), /* BE */
	FIELD_GET(TXQ_CNT_L, data[0]), /* BK */
	};
	u32 pse_mcu_quota = FIELD_GET(TXQ_CNT_L, data[2]);
	u32 pse_data_quota = 0, ple_data_quota = 0;
	struct mt76_sdio *sdio = &dev->sdio;
	int i;

	for (i = 0; i < ARRAY_SIZE(pse_ac_data_quota); i++) {
	pse_data_quota += pse_ac_data_quota[i];
	ple_data_quota += ple_ac_data_quota[i];
	}

	if (!pse_data_quota && !ple_data_quota && !pse_mcu_quota)
	return 0;

	mutex_lock(&sdio->sched.lock);
	sdio->sched.pse_mcu_quota += pse_mcu_quota;
	sdio->sched.pse_data_quota += pse_data_quota;
	sdio->sched.ple_data_quota += ple_data_quota;
	mutex_unlock(&sdio->sched.lock);

	return pse_data_quota + ple_data_quota + pse_mcu_quota;
	}

	static struct sk_buff mt7663s_build_rx_skb(void data, int data_len,
	int buf_len)
	{
	int len = min_t(int, data_len, MT_SKB_HEAD_LEN);
	struct sk_buff *skb;

	skb = alloc_skb(len, GFP_KERNEL);
	if (!skb)
	return NULL;

	skb_put_data(skb, data, len);
	if (data_len > len) {
	struct page *page;

	data += len;
	page = virt_to_head_page(data);
	skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
	page, data - page_address(page),
	data_len - len, buf_len);
	get_page(page);
	}

	return skb;
	}

	static int mt7663s_rx_run_queue(struct mt76_dev *dev, enum mt76_rxq_id qid,
	struct mt76s_intr *intr)
	{
	struct mt76_queue *q = &dev->q_rx[qid];
	struct mt76_sdio *sdio = &dev->sdio;
	int len = 0, err, i;
	struct page *page;
	u8 *buf;

	for (i = 0; i < intr->rx.num[qid]; i++)
	len += round_up(intr->rx.len[qid][i] + 4, 4);

	if (!len)
	return 0;

	if (len > sdio->func->cur_blksize)
	len = roundup(len, sdio->func->cur_blksize);

	page = __dev_alloc_pages(GFP_KERNEL, get_order(len));
	if (!page)
	return -ENOMEM;

	buf = page_address(page);

	sdio_claim_host(sdio->func);
	err = sdio_readsb(sdio->func, buf, MCR_WRDR(qid), len);
	sdio_release_host(sdio->func);

	if (err < 0) {
	dev_err(dev->dev, "sdio read data failed:%d\n", err);
	put_page(page);
	return err;
	}

	for (i = 0; i < intr->rx.num[qid]; i++) {
	int index = (q->head + i) % q->ndesc;
	struct mt76_queue_entry *e = &q->entry[index];

	len = intr->rx.len[qid][i];
	e->skb = mt7663s_build_rx_skb(buf, len, round_up(len + 4, 4));
	if (!e->skb)
	break;

	buf += round_up(len + 4, 4);
	if (q->queued + i + 1 == q->ndesc)
	break;
	}
	put_page(page);

	spin_lock_bh(&q->lock);
	q->head = (q->head + i) % q->ndesc;
	q->queued += i;
	spin_unlock_bh(&q->lock);

	return i;
	}

	static int mt7663s_tx_pick_quota(struct mt76_sdio *sdio, enum mt76_txq_id qid,
	int buf_sz, int pse_size, int ple_size)
	{
	int pse_sz;

	pse_sz = DIV_ROUND_UP(buf_sz + sdio->sched.deficit, MT_PSE_PAGE_SZ);

	if (qid == MT_TXQ_MCU) {
	if (sdio->sched.pse_mcu_quota < *pse_size + pse_sz)
	return -EBUSY;
	} else {
	if (sdio->sched.pse_data_quota < *pse_size + pse_sz \|\|
	sdio->sched.ple_data_quota < *ple_size + 1)
	return -EBUSY;

	ple_size = ple_size + 1;
	}
	pse_size = pse_size + pse_sz;

	return 0;
	}

	static void mt7663s_tx_update_quota(struct mt76_sdio *sdio, enum mt76_txq_id qid,
	int pse_size, int ple_size)
	{
	mutex_lock(&sdio->sched.lock);
	if (qid == MT_TXQ_MCU) {
	sdio->sched.pse_mcu_quota -= pse_size;
	} else {
	sdio->sched.pse_data_quota -= pse_size;
	sdio->sched.ple_data_quota -= ple_size;
	}
	mutex_unlock(&sdio->sched.lock);
	}

	static int __mt7663s_xmit_queue(struct mt76_dev dev, u8 data, int len)
	{
	struct mt76_sdio *sdio = &dev->sdio;
	int err;

	if (len > sdio->func->cur_blksize)
	len = roundup(len, sdio->func->cur_blksize);

	sdio_claim_host(sdio->func);
	err = sdio_writesb(sdio->func, MCR_WTDR1, data, len);
	sdio_release_host(sdio->func);

	if (err)
	dev_err(dev->dev, "sdio write failed: %d\n", err);

	return err;
	}

	static int mt7663s_tx_run_queue(struct mt76_dev *dev, enum mt76_txq_id qid)
	{
	int err, nframes = 0, len = 0, pse_sz = 0, ple_sz = 0;
	struct mt76_queue *q = dev->q_tx[qid];
	struct mt76_sdio *sdio = &dev->sdio;

	while (q->first != q->head) {
	struct mt76_queue_entry *e = &q->entry[q->first];
	struct sk_buff *iter;

	if (!test_bit(MT76_STATE_MCU_RUNNING, &dev->phy.state)) {
	__skb_put_zero(e->skb, 4);
	err = __mt7663s_xmit_queue(dev, e->skb->data,
	e->skb->len);
	if (err)
	return err;

	goto next;
	}

	if (len + e->skb->len + 4 > MT76S_XMIT_BUF_SZ)
	break;

	if (mt7663s_tx_pick_quota(sdio, qid, e->buf_sz, &pse_sz,
	&ple_sz))
	break;

	memcpy(sdio->xmit_buf[qid] + len, e->skb->data,
	skb_headlen(e->skb));
	len += skb_headlen(e->skb);
	nframes++;

	skb_walk_frags(e->skb, iter) {
	memcpy(sdio->xmit_buf[qid] + len, iter->data,
	iter->len);
	len += iter->len;
	nframes++;
	}
	next:
	q->first = (q->first + 1) % q->ndesc;
	e->done = true;
	}

	if (nframes) {
	memset(sdio->xmit_buf[qid] + len, 0, 4);
	err = __mt7663s_xmit_queue(dev, sdio->xmit_buf[qid], len + 4);
	if (err)
	return err;
	}
	mt7663s_tx_update_quota(sdio, qid, pse_sz, ple_sz);

	return nframes;
	}

	void mt7663s_tx_work(struct work_struct *work)
	{
	struct mt76_sdio *sdio = container_of(work, struct mt76_sdio,
	tx.xmit_work);
	struct mt76_dev *dev = container_of(sdio, struct mt76_dev, sdio);
	int i, nframes = 0;

	for (i = 0; i < MT_TXQ_MCU_WA; i++) {
	int ret;

	ret = mt7663s_tx_run_queue(dev, i);
	if (ret < 0)
	break;

	nframes += ret;
	}
	if (nframes)
	queue_work(sdio->txrx_wq, &sdio->tx.xmit_work);

	queue_work(sdio->txrx_wq, &sdio->tx.status_work);
	}

	void mt7663s_rx_work(struct work_struct *work)
	{
	struct mt76_sdio *sdio = container_of(work, struct mt76_sdio,
	rx.recv_work);
	struct mt76_dev *dev = container_of(sdio, struct mt76_dev, sdio);
	struct mt76s_intr *intr = sdio->intr_data;
	int nframes = 0, ret;

	/* disable interrupt */
	sdio_claim_host(sdio->func);
	sdio_writel(sdio->func, WHLPCR_INT_EN_CLR, MCR_WHLPCR, NULL);
	ret = sdio_readsb(sdio->func, intr, MCR_WHISR, sizeof(*intr));
	sdio_release_host(sdio->func);

	if (ret < 0)
	goto out;

	trace_dev_irq(dev, intr->isr, 0);

	if (intr->isr & WHIER_RX0_DONE_INT_EN) {
	ret = mt7663s_rx_run_queue(dev, 0, intr);
	if (ret > 0) {
	queue_work(sdio->txrx_wq, &sdio->rx.net_work);
	nframes += ret;
	}
	}

	if (intr->isr & WHIER_RX1_DONE_INT_EN) {
	ret = mt7663s_rx_run_queue(dev, 1, intr);
	if (ret > 0) {
	queue_work(sdio->txrx_wq, &sdio->rx.net_work);
	nframes += ret;
	}
	}

	if (mt7663s_refill_sched_quota(dev, intr->tx.wtqcr))
	queue_work(sdio->txrx_wq, &sdio->tx.xmit_work);

	if (nframes) {
	queue_work(sdio->txrx_wq, &sdio->rx.recv_work);
	return;
	}
	out:
	/* enable interrupt */
	sdio_claim_host(sdio->func);
	sdio_writel(sdio->func, WHLPCR_INT_EN_SET, MCR_WHLPCR, NULL);
	sdio_release_host(sdio->func);
	}

	void mt7663s_sdio_irq(struct sdio_func *func)
	{
	struct mt7615_dev *dev = sdio_get_drvdata(func);
	struct mt76_sdio *sdio = &dev->mt76.sdio;

	if (!test_bit(MT76_STATE_INITIALIZED, &dev->mt76.phy.state))
	return;

	queue_work(sdio->txrx_wq, &sdio->rx.recv_work);
	}