1 // SPDX-License-Identifier: ISC
2 /* Copyright (C) 2021 MediaTek Inc. */
3 
4 #include <linux/kernel.h>
5 #include <linux/mmc/sdio_func.h>
6 #include <linux/module.h>
7 #include <linux/iopoll.h>
8 
9 #include "mt7921.h"
10 #include "../sdio.h"
11 #include "../mt76_connac2_mac.h"
12 #include "mcu.h"
13 #include "regs.h"
14 
15 static int
mt7921s_mcu_send_message(struct mt76_dev * mdev,struct sk_buff * skb,int cmd,int * seq)16 mt7921s_mcu_send_message(struct mt76_dev *mdev, struct sk_buff *skb,
17 			 int cmd, int *seq)
18 {
19 	struct mt792x_dev *dev = container_of(mdev, struct mt792x_dev, mt76);
20 	enum mt7921_sdio_pkt_type type = MT7921_SDIO_CMD;
21 	enum mt76_mcuq_id txq = MT_MCUQ_WM;
22 	int ret, pad;
23 
24 	/* We just return in case firmware assertion to avoid blocking the
25 	 * common workqueue to run, for example, the coredump work might be
26 	 * blocked by mt792x_mac_work that is excuting register access via sdio
27 	 * bus.
28 	 */
29 	if (dev->fw_assert)
30 		return -EBUSY;
31 
32 	ret = mt76_connac2_mcu_fill_message(mdev, skb, cmd, seq);
33 	if (ret)
34 		return ret;
35 
36 	mdev->mcu.timeout = 3 * HZ;
37 
38 	if (cmd == MCU_CMD(FW_SCATTER))
39 		type = MT7921_SDIO_FWDL;
40 
41 	mt7921_skb_add_usb_sdio_hdr(dev, skb, type);
42 	pad = round_up(skb->len, 4) - skb->len;
43 	__skb_put_zero(skb, pad);
44 
45 	ret = mt76_tx_queue_skb_raw(dev, mdev->q_mcu[txq], skb, 0);
46 	if (ret)
47 		return ret;
48 
49 	mt76_queue_kick(dev, mdev->q_mcu[txq]);
50 
51 	return ret;
52 }
53 
mt7921s_read_rm3r(struct mt792x_dev * dev)54 static u32 mt7921s_read_rm3r(struct mt792x_dev *dev)
55 {
56 	struct mt76_sdio *sdio = &dev->mt76.sdio;
57 
58 	return sdio_readl(sdio->func, MCR_D2HRM3R, NULL);
59 }
60 
mt7921s_clear_rm3r_drv_own(struct mt792x_dev * dev)61 static u32 mt7921s_clear_rm3r_drv_own(struct mt792x_dev *dev)
62 {
63 	struct mt76_sdio *sdio = &dev->mt76.sdio;
64 	u32 val;
65 
66 	val = sdio_readl(sdio->func, MCR_D2HRM3R, NULL);
67 	if (val)
68 		sdio_writel(sdio->func, H2D_SW_INT_CLEAR_MAILBOX_ACK,
69 			    MCR_WSICR, NULL);
70 
71 	return val;
72 }
73 
mt7921s_mcu_init(struct mt792x_dev * dev)74 int mt7921s_mcu_init(struct mt792x_dev *dev)
75 {
76 	static const struct mt76_mcu_ops mt7921s_mcu_ops = {
77 		.headroom = MT_SDIO_HDR_SIZE +
78 			    sizeof(struct mt76_connac2_mcu_txd),
79 		.tailroom = MT_SDIO_TAIL_SIZE,
80 		.mcu_skb_send_msg = mt7921s_mcu_send_message,
81 		.mcu_parse_response = mt7921_mcu_parse_response,
82 		.mcu_rr = mt76_connac_mcu_reg_rr,
83 		.mcu_wr = mt76_connac_mcu_reg_wr,
84 	};
85 	int ret;
86 
87 	mt7921s_mcu_drv_pmctrl(dev);
88 
89 	dev->mt76.mcu_ops = &mt7921s_mcu_ops;
90 
91 	ret = mt7921_run_firmware(dev);
92 	if (ret)
93 		return ret;
94 
95 	set_bit(MT76_STATE_MCU_RUNNING, &dev->mphy.state);
96 
97 	return 0;
98 }
99 
mt7921s_mcu_drv_pmctrl(struct mt792x_dev * dev)100 int mt7921s_mcu_drv_pmctrl(struct mt792x_dev *dev)
101 {
102 	struct sdio_func *func = dev->mt76.sdio.func;
103 	struct mt76_phy *mphy = &dev->mt76.phy;
104 	struct mt76_connac_pm *pm = &dev->pm;
105 	u32 status;
106 	int err;
107 
108 	sdio_claim_host(func);
109 
110 	sdio_writel(func, WHLPCR_FW_OWN_REQ_CLR, MCR_WHLPCR, NULL);
111 
112 	err = readx_poll_timeout(mt76s_read_pcr, &dev->mt76, status,
113 				 status & WHLPCR_IS_DRIVER_OWN, 2000, 1000000);
114 
115 	if (!err && test_bit(MT76_STATE_MCU_RUNNING, &dev->mphy.state))
116 		err = readx_poll_timeout(mt7921s_read_rm3r, dev, status,
117 					 status & D2HRM3R_IS_DRIVER_OWN,
118 					 2000, 1000000);
119 
120 	sdio_release_host(func);
121 
122 	if (err < 0) {
123 		dev_err(dev->mt76.dev, "driver own failed\n");
124 		return -EIO;
125 	}
126 
127 	clear_bit(MT76_STATE_PM, &mphy->state);
128 
129 	pm->stats.last_wake_event = jiffies;
130 	pm->stats.doze_time += pm->stats.last_wake_event -
131 			       pm->stats.last_doze_event;
132 
133 	return 0;
134 }
135 
mt7921s_mcu_fw_pmctrl(struct mt792x_dev * dev)136 int mt7921s_mcu_fw_pmctrl(struct mt792x_dev *dev)
137 {
138 	struct sdio_func *func = dev->mt76.sdio.func;
139 	struct mt76_phy *mphy = &dev->mt76.phy;
140 	struct mt76_connac_pm *pm = &dev->pm;
141 	u32 status;
142 	int err;
143 
144 	sdio_claim_host(func);
145 
146 	if (test_bit(MT76_STATE_MCU_RUNNING, &dev->mphy.state)) {
147 		err = readx_poll_timeout(mt7921s_clear_rm3r_drv_own,
148 					 dev, status,
149 					 !(status & D2HRM3R_IS_DRIVER_OWN),
150 					 2000, 1000000);
151 		if (err < 0) {
152 			dev_err(dev->mt76.dev, "mailbox ACK not cleared\n");
153 			goto out;
154 		}
155 	}
156 
157 	sdio_writel(func, WHLPCR_FW_OWN_REQ_SET, MCR_WHLPCR, NULL);
158 
159 	err = readx_poll_timeout(mt76s_read_pcr, &dev->mt76, status,
160 				 !(status & WHLPCR_IS_DRIVER_OWN), 2000, 1000000);
161 out:
162 	sdio_release_host(func);
163 
164 	if (err < 0) {
165 		dev_err(dev->mt76.dev, "firmware own failed\n");
166 		clear_bit(MT76_STATE_PM, &mphy->state);
167 		return -EIO;
168 	}
169 
170 	pm->stats.last_doze_event = jiffies;
171 	pm->stats.awake_time += pm->stats.last_doze_event -
172 				pm->stats.last_wake_event;
173 
174 	return 0;
175 }
176