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
15static int
16mt7921s_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
54static 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
61static 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
74int 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
100int 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
136int 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);
161out:
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