tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2019 MediaTek Inc.
4 * Author: Stanley Chu <stanley.chu@mediatek.com>
5 */
6
7#include <linux/clk.h>
8#include <linux/delay.h>
9#include <linux/io.h>
10#include <linux/module.h>
11#include <linux/phy/phy.h>
12#include <linux/platform_device.h>
13
14#include "phy-mtk-io.h"
15
16/* mphy register and offsets */
17#define MP_GLB_DIG_8C 0x008C
18#define FRC_PLL_ISO_EN BIT(8)
19#define PLL_ISO_EN BIT(9)
20#define FRC_FRC_PWR_ON BIT(10)
21#define PLL_PWR_ON BIT(11)
22
23#define MP_LN_DIG_RX_9C 0xA09C
24#define FSM_DIFZ_FRC BIT(18)
25
26#define MP_LN_DIG_RX_AC 0xA0AC
27#define FRC_RX_SQ_EN BIT(0)
28#define RX_SQ_EN BIT(1)
29
30#define MP_LN_RX_44 0xB044
31#define FRC_CDR_PWR_ON BIT(17)
32#define CDR_PWR_ON BIT(18)
33#define FRC_CDR_ISO_EN BIT(19)
34#define CDR_ISO_EN BIT(20)
35
36#define UFSPHY_CLKS_CNT 2
37
38struct ufs_mtk_phy {
39 struct device *dev;
40 void __iomem *mmio;
41 struct clk_bulk_data clks[UFSPHY_CLKS_CNT];
42};
43
44static struct ufs_mtk_phy *get_ufs_mtk_phy(struct phy *generic_phy)
45{
46 return (struct ufs_mtk_phy *)phy_get_drvdata(generic_phy);
47}
48
49static int ufs_mtk_phy_clk_init(struct ufs_mtk_phy *phy)
50{
51 struct device *dev = phy->dev;
52 struct clk_bulk_data *clks = phy->clks;
53
54 clks[0].id = "unipro";
55 clks[1].id = "mp";
56 return devm_clk_bulk_get(dev, UFSPHY_CLKS_CNT, clks);
57}
58
59static void ufs_mtk_phy_set_active(struct ufs_mtk_phy *phy)
60{
61 void __iomem *mmio = phy->mmio;
62
63 /* release DA_MP_PLL_PWR_ON */
64 mtk_phy_set_bits(mmio + MP_GLB_DIG_8C, PLL_PWR_ON);
65 mtk_phy_clear_bits(mmio + MP_GLB_DIG_8C, FRC_FRC_PWR_ON);
66
67 /* release DA_MP_PLL_ISO_EN */
68 mtk_phy_clear_bits(mmio + MP_GLB_DIG_8C, PLL_ISO_EN);
69 mtk_phy_clear_bits(mmio + MP_GLB_DIG_8C, FRC_PLL_ISO_EN);
70
71 /* release DA_MP_CDR_PWR_ON */
72 mtk_phy_set_bits(mmio + MP_LN_RX_44, CDR_PWR_ON);
73 mtk_phy_clear_bits(mmio + MP_LN_RX_44, FRC_CDR_PWR_ON);
74
75 /* release DA_MP_CDR_ISO_EN */
76 mtk_phy_clear_bits(mmio + MP_LN_RX_44, CDR_ISO_EN);
77 mtk_phy_clear_bits(mmio + MP_LN_RX_44, FRC_CDR_ISO_EN);
78
79 /* release DA_MP_RX0_SQ_EN */
80 mtk_phy_set_bits(mmio + MP_LN_DIG_RX_AC, RX_SQ_EN);
81 mtk_phy_clear_bits(mmio + MP_LN_DIG_RX_AC, FRC_RX_SQ_EN);
82
83 /* delay 1us to wait DIFZ stable */
84 udelay(1);
85
86 /* release DIFZ */
87 mtk_phy_clear_bits(mmio + MP_LN_DIG_RX_9C, FSM_DIFZ_FRC);
88}
89
90static void ufs_mtk_phy_set_deep_hibern(struct ufs_mtk_phy *phy)
91{
92 void __iomem *mmio = phy->mmio;
93
94 /* force DIFZ */
95 mtk_phy_set_bits(mmio + MP_LN_DIG_RX_9C, FSM_DIFZ_FRC);
96
97 /* force DA_MP_RX0_SQ_EN */
98 mtk_phy_set_bits(mmio + MP_LN_DIG_RX_AC, FRC_RX_SQ_EN);
99 mtk_phy_clear_bits(mmio + MP_LN_DIG_RX_AC, RX_SQ_EN);
100
101 /* force DA_MP_CDR_ISO_EN */
102 mtk_phy_set_bits(mmio + MP_LN_RX_44, FRC_CDR_ISO_EN);
103 mtk_phy_set_bits(mmio + MP_LN_RX_44, CDR_ISO_EN);
104
105 /* force DA_MP_CDR_PWR_ON */
106 mtk_phy_set_bits(mmio + MP_LN_RX_44, FRC_CDR_PWR_ON);
107 mtk_phy_clear_bits(mmio + MP_LN_RX_44, CDR_PWR_ON);
108
109 /* force DA_MP_PLL_ISO_EN */
110 mtk_phy_set_bits(mmio + MP_GLB_DIG_8C, FRC_PLL_ISO_EN);
111 mtk_phy_set_bits(mmio + MP_GLB_DIG_8C, PLL_ISO_EN);
112
113 /* force DA_MP_PLL_PWR_ON */
114 mtk_phy_set_bits(mmio + MP_GLB_DIG_8C, FRC_FRC_PWR_ON);
115 mtk_phy_clear_bits(mmio + MP_GLB_DIG_8C, PLL_PWR_ON);
116}
117
118static int ufs_mtk_phy_power_on(struct phy *generic_phy)
119{
120 struct ufs_mtk_phy *phy = get_ufs_mtk_phy(generic_phy);
121 int ret;
122
123 ret = clk_bulk_prepare_enable(UFSPHY_CLKS_CNT, phy->clks);
124 if (ret)
125 return ret;
126
127 ufs_mtk_phy_set_active(phy);
128
129 return 0;
130}
131
132static int ufs_mtk_phy_power_off(struct phy *generic_phy)
133{
134 struct ufs_mtk_phy *phy = get_ufs_mtk_phy(generic_phy);
135
136 ufs_mtk_phy_set_deep_hibern(phy);
137
138 clk_bulk_disable_unprepare(UFSPHY_CLKS_CNT, phy->clks);
139
140 return 0;
141}
142
143static const struct phy_ops ufs_mtk_phy_ops = {
144 .power_on = ufs_mtk_phy_power_on,
145 .power_off = ufs_mtk_phy_power_off,
146 .owner = THIS_MODULE,
147};
148
149static int ufs_mtk_phy_probe(struct platform_device *pdev)
150{
151 struct device *dev = &pdev->dev;
152 struct phy *generic_phy;
153 struct phy_provider *phy_provider;
154 struct ufs_mtk_phy *phy;
155 int ret;
156
157 phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
158 if (!phy)
159 return -ENOMEM;
160
161 phy->mmio = devm_platform_ioremap_resource(pdev, 0);
162 if (IS_ERR(phy->mmio))
163 return PTR_ERR(phy->mmio);
164
165 phy->dev = dev;
166
167 ret = ufs_mtk_phy_clk_init(phy);
168 if (ret)
169 return ret;
170
171 generic_phy = devm_phy_create(dev, NULL, &ufs_mtk_phy_ops);
172 if (IS_ERR(generic_phy))
173 return PTR_ERR(generic_phy);
174
175 phy_set_drvdata(generic_phy, phy);
176
177 phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
178
179 return PTR_ERR_OR_ZERO(phy_provider);
180}
181
182static const struct of_device_id ufs_mtk_phy_of_match[] = {
183 {.compatible = "mediatek,mt8183-ufsphy"},
184 {},
185};
186MODULE_DEVICE_TABLE(of, ufs_mtk_phy_of_match);
187
188static struct platform_driver ufs_mtk_phy_driver = {
189 .probe = ufs_mtk_phy_probe,
190 .driver = {
191 .of_match_table = ufs_mtk_phy_of_match,
192 .name = "ufs_mtk_phy",
193 },
194};
195module_platform_driver(ufs_mtk_phy_driver);
196
197MODULE_DESCRIPTION("Universal Flash Storage (UFS) MediaTek MPHY");
198MODULE_AUTHOR("Stanley Chu <stanley.chu@mediatek.com>");
199MODULE_LICENSE("GPL v2");