1 // SPDX-License-Identifier: ISC
2 /*
3 * Copyright (C) 2019 Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
4 */
5
6 #include "mt76.h"
7
8 struct sk_buff *
__mt76_mcu_msg_alloc(struct mt76_dev * dev,const void * data,int len,int data_len,gfp_t gfp)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 }
30 EXPORT_SYMBOL_GPL(__mt76_mcu_msg_alloc);
31
mt76_mcu_get_response(struct mt76_dev * dev,unsigned long expires)32 struct 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 }
47 EXPORT_SYMBOL_GPL(mt76_mcu_get_response);
48
mt76_mcu_rx_event(struct mt76_dev * dev,struct sk_buff * skb)49 void 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 }
54 EXPORT_SYMBOL_GPL(mt76_mcu_rx_event);
55
mt76_mcu_send_and_get_msg(struct mt76_dev * dev,int cmd,const void * data,int len,bool wait_resp,struct sk_buff ** ret_skb)56 int 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 }
70 EXPORT_SYMBOL_GPL(mt76_mcu_send_and_get_msg);
71
mt76_mcu_skb_send_and_get_msg(struct mt76_dev * dev,struct sk_buff * skb,int cmd,bool wait_resp,struct sk_buff ** ret_skb)72 int 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
97 retry:
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
130 out:
131 dev_kfree_skb(orig_skb);
132 mutex_unlock(&dev->mcu.mutex);
133
134 return ret;
135 }
136 EXPORT_SYMBOL_GPL(mt76_mcu_skb_send_and_get_msg);
137
__mt76_mcu_send_firmware(struct mt76_dev * dev,int cmd,const void * data,int len,int max_len)138 int __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 }
161 EXPORT_SYMBOL_GPL(__mt76_mcu_send_firmware);
162