1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) 2014 Linaro Ltd.
4 * Copyright (c) 2014 HiSilicon Limited.
5 */
6
7 #include <linux/delay.h>
8 #include <linux/io.h>
9 #include <linux/mfd/syscon.h>
10 #include <linux/module.h>
11 #include <linux/of.h>
12 #include <linux/phy/phy.h>
13 #include <linux/platform_device.h>
14 #include <linux/regmap.h>
15
16 #define SATA_PHY0_CTLL 0xa0
17 #define MPLL_MULTIPLIER_SHIFT 1
18 #define MPLL_MULTIPLIER_MASK 0xfe
19 #define MPLL_MULTIPLIER_50M 0x3c
20 #define MPLL_MULTIPLIER_100M 0x1e
21 #define PHY_RESET BIT(0)
22 #define REF_SSP_EN BIT(9)
23 #define SSC_EN BIT(10)
24 #define REF_USE_PAD BIT(23)
25
26 #define SATA_PORT_PHYCTL 0x174
27 #define SPEED_MODE_MASK 0x6f0000
28 #define HALF_RATE_SHIFT 16
29 #define PHY_CONFIG_SHIFT 18
30 #define GEN2_EN_SHIFT 21
31 #define SPEED_CTRL BIT(20)
32
33 #define SATA_PORT_PHYCTL1 0x148
34 #define AMPLITUDE_MASK 0x3ffffe
35 #define AMPLITUDE_GEN3 0x68
36 #define AMPLITUDE_GEN3_SHIFT 15
37 #define AMPLITUDE_GEN2 0x56
38 #define AMPLITUDE_GEN2_SHIFT 8
39 #define AMPLITUDE_GEN1 0x56
40 #define AMPLITUDE_GEN1_SHIFT 1
41
42 #define SATA_PORT_PHYCTL2 0x14c
43 #define PREEMPH_MASK 0x3ffff
44 #define PREEMPH_GEN3 0x20
45 #define PREEMPH_GEN3_SHIFT 12
46 #define PREEMPH_GEN2 0x15
47 #define PREEMPH_GEN2_SHIFT 6
48 #define PREEMPH_GEN1 0x5
49 #define PREEMPH_GEN1_SHIFT 0
50
51 struct hix5hd2_priv {
52 void __iomem *base;
53 struct regmap *peri_ctrl;
54 };
55
56 enum phy_speed_mode {
57 SPEED_MODE_GEN1 = 0,
58 SPEED_MODE_GEN2 = 1,
59 SPEED_MODE_GEN3 = 2,
60 };
61
hix5hd2_sata_phy_init(struct phy * phy)62 static int hix5hd2_sata_phy_init(struct phy *phy)
63 {
64 struct hix5hd2_priv *priv = phy_get_drvdata(phy);
65 u32 val, data[2];
66 int ret;
67
68 if (priv->peri_ctrl) {
69 ret = of_property_read_u32_array(phy->dev.of_node,
70 "hisilicon,power-reg",
71 &data[0], 2);
72 if (ret) {
73 dev_err(&phy->dev, "Fail read hisilicon,power-reg\n");
74 return ret;
75 }
76
77 regmap_update_bits(priv->peri_ctrl, data[0],
78 BIT(data[1]), BIT(data[1]));
79 }
80
81 /* reset phy */
82 val = readl_relaxed(priv->base + SATA_PHY0_CTLL);
83 val &= ~(MPLL_MULTIPLIER_MASK | REF_USE_PAD);
84 val |= MPLL_MULTIPLIER_50M << MPLL_MULTIPLIER_SHIFT |
85 REF_SSP_EN | PHY_RESET;
86 writel_relaxed(val, priv->base + SATA_PHY0_CTLL);
87 msleep(20);
88 val &= ~PHY_RESET;
89 writel_relaxed(val, priv->base + SATA_PHY0_CTLL);
90
91 val = readl_relaxed(priv->base + SATA_PORT_PHYCTL1);
92 val &= ~AMPLITUDE_MASK;
93 val |= AMPLITUDE_GEN3 << AMPLITUDE_GEN3_SHIFT |
94 AMPLITUDE_GEN2 << AMPLITUDE_GEN2_SHIFT |
95 AMPLITUDE_GEN1 << AMPLITUDE_GEN1_SHIFT;
96 writel_relaxed(val, priv->base + SATA_PORT_PHYCTL1);
97
98 val = readl_relaxed(priv->base + SATA_PORT_PHYCTL2);
99 val &= ~PREEMPH_MASK;
100 val |= PREEMPH_GEN3 << PREEMPH_GEN3_SHIFT |
101 PREEMPH_GEN2 << PREEMPH_GEN2_SHIFT |
102 PREEMPH_GEN1 << PREEMPH_GEN1_SHIFT;
103 writel_relaxed(val, priv->base + SATA_PORT_PHYCTL2);
104
105 /* ensure PHYCTRL setting takes effect */
106 val = readl_relaxed(priv->base + SATA_PORT_PHYCTL);
107 val &= ~SPEED_MODE_MASK;
108 val |= SPEED_MODE_GEN1 << HALF_RATE_SHIFT |
109 SPEED_MODE_GEN1 << PHY_CONFIG_SHIFT |
110 SPEED_MODE_GEN1 << GEN2_EN_SHIFT | SPEED_CTRL;
111 writel_relaxed(val, priv->base + SATA_PORT_PHYCTL);
112
113 msleep(20);
114 val &= ~SPEED_MODE_MASK;
115 val |= SPEED_MODE_GEN3 << HALF_RATE_SHIFT |
116 SPEED_MODE_GEN3 << PHY_CONFIG_SHIFT |
117 SPEED_MODE_GEN3 << GEN2_EN_SHIFT | SPEED_CTRL;
118 writel_relaxed(val, priv->base + SATA_PORT_PHYCTL);
119
120 val &= ~(SPEED_MODE_MASK | SPEED_CTRL);
121 val |= SPEED_MODE_GEN2 << HALF_RATE_SHIFT |
122 SPEED_MODE_GEN2 << PHY_CONFIG_SHIFT |
123 SPEED_MODE_GEN2 << GEN2_EN_SHIFT;
124 writel_relaxed(val, priv->base + SATA_PORT_PHYCTL);
125
126 return 0;
127 }
128
129 static const struct phy_ops hix5hd2_sata_phy_ops = {
130 .init = hix5hd2_sata_phy_init,
131 .owner = THIS_MODULE,
132 };
133
hix5hd2_sata_phy_probe(struct platform_device * pdev)134 static int hix5hd2_sata_phy_probe(struct platform_device *pdev)
135 {
136 struct phy_provider *phy_provider;
137 struct device *dev = &pdev->dev;
138 struct resource *res;
139 struct phy *phy;
140 struct hix5hd2_priv *priv;
141
142 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
143 if (!priv)
144 return -ENOMEM;
145
146 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
147 if (!res)
148 return -EINVAL;
149
150 priv->base = devm_ioremap(dev, res->start, resource_size(res));
151 if (!priv->base)
152 return -ENOMEM;
153
154 priv->peri_ctrl = syscon_regmap_lookup_by_phandle(dev->of_node,
155 "hisilicon,peripheral-syscon");
156 if (IS_ERR(priv->peri_ctrl))
157 priv->peri_ctrl = NULL;
158
159 phy = devm_phy_create(dev, NULL, &hix5hd2_sata_phy_ops);
160 if (IS_ERR(phy)) {
161 dev_err(dev, "failed to create PHY\n");
162 return PTR_ERR(phy);
163 }
164
165 phy_set_drvdata(phy, priv);
166 phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
167 return PTR_ERR_OR_ZERO(phy_provider);
168 }
169
170 static const struct of_device_id hix5hd2_sata_phy_of_match[] = {
171 {.compatible = "hisilicon,hix5hd2-sata-phy",},
172 { },
173 };
174 MODULE_DEVICE_TABLE(of, hix5hd2_sata_phy_of_match);
175
176 static struct platform_driver hix5hd2_sata_phy_driver = {
177 .probe = hix5hd2_sata_phy_probe,
178 .driver = {
179 .name = "hix5hd2-sata-phy",
180 .of_match_table = hix5hd2_sata_phy_of_match,
181 }
182 };
183 module_platform_driver(hix5hd2_sata_phy_driver);
184
185 MODULE_AUTHOR("Jiancheng Xue <xuejiancheng@huawei.com>");
186 MODULE_DESCRIPTION("HISILICON HIX5HD2 SATA PHY driver");
187 MODULE_ALIAS("platform:hix5hd2-sata-phy");
188 MODULE_LICENSE("GPL v2");
189