mcu.c

  1// SPDX-License-Identifier: BSD-3-Clause-Clear
  2/*
  3 * Copyright (C) 2019 Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
  4 */
  5
  6#include "mt76.h"
  7
  8struct sk_buff *
  9__mt76_mcu_msg_alloc(struct mt76_dev *dev, const void *data,
 10		     int len, int data_len, gfp_t gfp)
 11{
 12	const struct mt76_mcu_ops *ops = dev->mcu_ops;
 13	struct sk_buff *skb;
 14
 15	len = max_t(int, len, data_len);
 16	len = ops->headroom + len + ops->tailroom;
 17
 18	skb = alloc_skb(len, gfp);
 19	if (!skb)
 20		return NULL;
 21
 22	memset(skb->head, 0, len);
 23	skb_reserve(skb, ops->headroom);
 24
 25	if (data && data_len)
 26		skb_put_data(skb, data, data_len);
 27
 28	return skb;
 29}
 30EXPORT_SYMBOL_GPL(__mt76_mcu_msg_alloc);
 31
 32struct sk_buff *mt76_mcu_get_response(struct mt76_dev *dev,
 33				      unsigned long expires)
 34{
 35	unsigned long timeout;
 36
 37	if (!time_is_after_jiffies(expires))
 38		return NULL;
 39
 40	timeout = expires - jiffies;
 41	wait_event_timeout(dev->mcu.wait,
 42			   (!skb_queue_empty(&dev->mcu.res_q) ||
 43			    test_bit(MT76_MCU_RESET, &dev->phy.state)),
 44			   timeout);
 45	return skb_dequeue(&dev->mcu.res_q);
 46}
 47EXPORT_SYMBOL_GPL(mt76_mcu_get_response);
 48
 49void mt76_mcu_rx_event(struct mt76_dev *dev, struct sk_buff *skb)
 50{
 51	skb_queue_tail(&dev->mcu.res_q, skb);
 52	wake_up(&dev->mcu.wait);
 53}
 54EXPORT_SYMBOL_GPL(mt76_mcu_rx_event);
 55
 56int mt76_mcu_send_and_get_msg(struct mt76_dev *dev, int cmd, const void *data,
 57			      int len, bool wait_resp, struct sk_buff **ret_skb)
 58{
 59	struct sk_buff *skb;
 60
 61	if (dev->mcu_ops->mcu_send_msg)
 62		return dev->mcu_ops->mcu_send_msg(dev, cmd, data, len, wait_resp);
 63
 64	skb = mt76_mcu_msg_alloc(dev, data, len);
 65	if (!skb)
 66		return -ENOMEM;
 67
 68	return mt76_mcu_skb_send_and_get_msg(dev, skb, cmd, wait_resp, ret_skb);
 69}
 70EXPORT_SYMBOL_GPL(mt76_mcu_send_and_get_msg);
 71
 72int mt76_mcu_skb_send_and_get_msg(struct mt76_dev *dev, struct sk_buff *skb,
 73				  int cmd, bool wait_resp,
 74				  struct sk_buff **ret_skb)
 75{
 76	unsigned int retry = 0;
 77	struct sk_buff *orig_skb = NULL;
 78	unsigned long expires;
 79	int ret, seq;
 80
 81	if (mt76_is_sdio(dev))
 82		if (test_bit(MT76_RESET, &dev->phy.state) && atomic_read(&dev->bus_hung))
 83			return -EIO;
 84
 85	if (ret_skb)
 86		*ret_skb = NULL;
 87
 88	mutex_lock(&dev->mcu.mutex);
 89
 90	if (dev->mcu_ops->mcu_skb_prepare_msg) {
 91		orig_skb = skb;
 92		ret = dev->mcu_ops->mcu_skb_prepare_msg(dev, skb, cmd, &seq);
 93		if (ret < 0)
 94			goto out;
 95	}
 96
 97retry:
 98	/* orig skb might be needed for retry, mcu_skb_send_msg consumes it */
 99	if (orig_skb)
100		skb_get(orig_skb);
101	ret = dev->mcu_ops->mcu_skb_send_msg(dev, skb, cmd, &seq);
102	if (ret < 0)
103		goto out;
104
105	if (!wait_resp) {
106		ret = 0;
107		goto out;
108	}
109
110	expires = jiffies + dev->mcu.timeout;
111
112	do {
113		skb = mt76_mcu_get_response(dev, expires);
114		if (!skb && !test_bit(MT76_MCU_RESET, &dev->phy.state) &&
115		    orig_skb && retry++ < dev->mcu_ops->max_retry) {
116			dev_err(dev->dev, "Retry message %08x (seq %d)\n",
117				cmd, seq);
118			skb = orig_skb;
119			goto retry;
120		}
121
122		ret = dev->mcu_ops->mcu_parse_response(dev, cmd, skb, seq);
123		if (!ret && ret_skb)
124			*ret_skb = skb;
125		else
126			dev_kfree_skb(skb);
127	} while (ret == -EAGAIN);
128
129
130out:
131	dev_kfree_skb(orig_skb);
132	mutex_unlock(&dev->mcu.mutex);
133
134	return ret;
135}
136EXPORT_SYMBOL_GPL(mt76_mcu_skb_send_and_get_msg);
137
138int __mt76_mcu_send_firmware(struct mt76_dev *dev, int cmd, const void *data,
139			     int len, int max_len)
140{
141	int err, cur_len;
142
143	while (len > 0) {
144		cur_len = min_t(int, max_len, len);
145
146		err = mt76_mcu_send_msg(dev, cmd, data, cur_len, false);
147		if (err)
148			return err;
149
150		data += cur_len;
151		len -= cur_len;
152
153		if (dev->queue_ops->tx_cleanup)
154			dev->queue_ops->tx_cleanup(dev,
155						   dev->q_mcu[MT_MCUQ_FWDL],
156						   false);
157	}
158
159	return 0;
160}
161EXPORT_SYMBOL_GPL(__mt76_mcu_send_firmware);