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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
15#define MP_GLB_DIG_8C 0x008C
16#define FRC_PLL_ISO_EN BIT(8)
17#define PLL_ISO_EN BIT(9)
18#define FRC_FRC_PWR_ON BIT(10)
19#define PLL_PWR_ON BIT(11)
20
21#define MP_LN_DIG_RX_9C 0xA09C
22#define FSM_DIFZ_FRC BIT(18)
23
24#define MP_LN_DIG_RX_AC 0xA0AC
25#define FRC_RX_SQ_EN BIT(0)
26#define RX_SQ_EN BIT(1)
27
28#define MP_LN_RX_44 0xB044
29#define FRC_CDR_PWR_ON BIT(17)
30#define CDR_PWR_ON BIT(18)
31#define FRC_CDR_ISO_EN BIT(19)
32#define CDR_ISO_EN BIT(20)
33
34struct ufs_mtk_phy {
35 struct device *dev;
36 void __iomem *mmio;
37 struct clk *mp_clk;
38 struct clk *unipro_clk;
39};
40
41static inline u32 mphy_readl(struct ufs_mtk_phy *phy, u32 reg)
42{
43 return readl(phy->mmio + reg);
44}
45
46static inline void mphy_writel(struct ufs_mtk_phy *phy, u32 val, u32 reg)
47{
48 writel(val, phy->mmio + reg);
49}
50
51static void mphy_set_bit(struct ufs_mtk_phy *phy, u32 reg, u32 bit)
52{
53 u32 val;
54
55 val = mphy_readl(phy, reg);
56 val |= bit;
57 mphy_writel(phy, val, reg);
58}
59
60static void mphy_clr_bit(struct ufs_mtk_phy *phy, u32 reg, u32 bit)
61{
62 u32 val;
63
64 val = mphy_readl(phy, reg);
65 val &= ~bit;
66 mphy_writel(phy, val, reg);
67}
68
69static struct ufs_mtk_phy *get_ufs_mtk_phy(struct phy *generic_phy)
70{
71 return (struct ufs_mtk_phy *)phy_get_drvdata(generic_phy);
72}
73
74static int ufs_mtk_phy_clk_init(struct ufs_mtk_phy *phy)
75{
76 struct device *dev = phy->dev;
77
78 phy->unipro_clk = devm_clk_get(dev, "unipro");
79 if (IS_ERR(phy->unipro_clk)) {
80 dev_err(dev, "failed to get clock: unipro");
81 return PTR_ERR(phy->unipro_clk);
82 }
83
84 phy->mp_clk = devm_clk_get(dev, "mp");
85 if (IS_ERR(phy->mp_clk)) {
86 dev_err(dev, "failed to get clock: mp");
87 return PTR_ERR(phy->mp_clk);
88 }
89
90 return 0;
91}
92
93static void ufs_mtk_phy_set_active(struct ufs_mtk_phy *phy)
94{
95
96 mphy_set_bit(phy, MP_GLB_DIG_8C, PLL_PWR_ON);
97 mphy_clr_bit(phy, MP_GLB_DIG_8C, FRC_FRC_PWR_ON);
98
99
100 mphy_clr_bit(phy, MP_GLB_DIG_8C, PLL_ISO_EN);
101 mphy_clr_bit(phy, MP_GLB_DIG_8C, FRC_PLL_ISO_EN);
102
103
104 mphy_set_bit(phy, MP_LN_RX_44, CDR_PWR_ON);
105 mphy_clr_bit(phy, MP_LN_RX_44, FRC_CDR_PWR_ON);
106
107
108 mphy_clr_bit(phy, MP_LN_RX_44, CDR_ISO_EN);
109 mphy_clr_bit(phy, MP_LN_RX_44, FRC_CDR_ISO_EN);
110
111
112 mphy_set_bit(phy, MP_LN_DIG_RX_AC, RX_SQ_EN);
113 mphy_clr_bit(phy, MP_LN_DIG_RX_AC, FRC_RX_SQ_EN);
114
115
116 udelay(1);
117
118
119 mphy_clr_bit(phy, MP_LN_DIG_RX_9C, FSM_DIFZ_FRC);
120}
121
122static void ufs_mtk_phy_set_deep_hibern(struct ufs_mtk_phy *phy)
123{
124
125 mphy_set_bit(phy, MP_LN_DIG_RX_9C, FSM_DIFZ_FRC);
126
127
128 mphy_set_bit(phy, MP_LN_DIG_RX_AC, FRC_RX_SQ_EN);
129 mphy_clr_bit(phy, MP_LN_DIG_RX_AC, RX_SQ_EN);
130
131
132 mphy_set_bit(phy, MP_LN_RX_44, FRC_CDR_ISO_EN);
133 mphy_set_bit(phy, MP_LN_RX_44, CDR_ISO_EN);
134
135
136 mphy_set_bit(phy, MP_LN_RX_44, FRC_CDR_PWR_ON);
137 mphy_clr_bit(phy, MP_LN_RX_44, CDR_PWR_ON);
138
139
140 mphy_set_bit(phy, MP_GLB_DIG_8C, FRC_PLL_ISO_EN);
141 mphy_set_bit(phy, MP_GLB_DIG_8C, PLL_ISO_EN);
142
143
144 mphy_set_bit(phy, MP_GLB_DIG_8C, FRC_FRC_PWR_ON);
145 mphy_clr_bit(phy, MP_GLB_DIG_8C, PLL_PWR_ON);
146}
147
148static int ufs_mtk_phy_power_on(struct phy *generic_phy)
149{
150 struct ufs_mtk_phy *phy = get_ufs_mtk_phy(generic_phy);
151 int ret;
152
153 ret = clk_prepare_enable(phy->unipro_clk);
154 if (ret) {
155 dev_err(phy->dev, "unipro_clk enable failed %d\n", ret);
156 goto out;
157 }
158
159 ret = clk_prepare_enable(phy->mp_clk);
160 if (ret) {
161 dev_err(phy->dev, "mp_clk enable failed %d\n", ret);
162 goto out_unprepare_unipro_clk;
163 }
164
165 ufs_mtk_phy_set_active(phy);
166
167 return 0;
168
169out_unprepare_unipro_clk:
170 clk_disable_unprepare(phy->unipro_clk);
171out:
172 return ret;
173}
174
175static int ufs_mtk_phy_power_off(struct phy *generic_phy)
176{
177 struct ufs_mtk_phy *phy = get_ufs_mtk_phy(generic_phy);
178
179 ufs_mtk_phy_set_deep_hibern(phy);
180
181 clk_disable_unprepare(phy->unipro_clk);
182 clk_disable_unprepare(phy->mp_clk);
183
184 return 0;
185}
186
187static const struct phy_ops ufs_mtk_phy_ops = {
188 .power_on = ufs_mtk_phy_power_on,
189 .power_off = ufs_mtk_phy_power_off,
190 .owner = THIS_MODULE,
191};
192
193static int ufs_mtk_phy_probe(struct platform_device *pdev)
194{
195 struct device *dev = &pdev->dev;
196 struct phy *generic_phy;
197 struct phy_provider *phy_provider;
198 struct resource *res;
199 struct ufs_mtk_phy *phy;
200 int ret;
201
202 phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
203 if (!phy)
204 return -ENOMEM;
205
206 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
207 phy->mmio = devm_ioremap_resource(dev, res);
208 if (IS_ERR(phy->mmio))
209 return PTR_ERR(phy->mmio);
210
211 phy->dev = dev;
212
213 ret = ufs_mtk_phy_clk_init(phy);
214 if (ret)
215 return ret;
216
217 generic_phy = devm_phy_create(dev, NULL, &ufs_mtk_phy_ops);
218 if (IS_ERR(generic_phy))
219 return PTR_ERR(generic_phy);
220
221 phy_set_drvdata(generic_phy, phy);
222
223 phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
224
225 return PTR_ERR_OR_ZERO(phy_provider);
226}
227
228static const struct of_device_id ufs_mtk_phy_of_match[] = {
229 {.compatible = "mediatek,mt8183-ufsphy"},
230 {},
231};
232MODULE_DEVICE_TABLE(of, ufs_mtk_phy_of_match);
233
234static struct platform_driver ufs_mtk_phy_driver = {
235 .probe = ufs_mtk_phy_probe,
236 .driver = {
237 .of_match_table = ufs_mtk_phy_of_match,
238 .name = "ufs_mtk_phy",
239 },
240};
241module_platform_driver(ufs_mtk_phy_driver);
242
243MODULE_DESCRIPTION("Universal Flash Storage (UFS) MediaTek MPHY");
244MODULE_AUTHOR("Stanley Chu <stanley.chu@mediatek.com>");
245MODULE_LICENSE("GPL v2");
246
