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 
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 
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