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1/*
2 * ST SPEAr1310-miphy driver
3 *
4 * Copyright (C) 2014 ST Microelectronics
5 * Pratyush Anand <pratyush.anand@gmail.com>
6 * Mohit Kumar <mohit.kumar.dhaka@gmail.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 */
13
14#include <linux/bitops.h>
15#include <linux/delay.h>
16#include <linux/dma-mapping.h>
17#include <linux/kernel.h>
18#include <linux/mfd/syscon.h>
19#include <linux/module.h>
20#include <linux/of_device.h>
21#include <linux/phy/phy.h>
22#include <linux/regmap.h>
23
24/* SPEAr1310 Registers */
25#define SPEAR1310_PCIE_SATA_CFG 0x3A4
26 #define SPEAR1310_PCIE_SATA2_SEL_PCIE (0 << 31)
27 #define SPEAR1310_PCIE_SATA1_SEL_PCIE (0 << 30)
28 #define SPEAR1310_PCIE_SATA0_SEL_PCIE (0 << 29)
29 #define SPEAR1310_PCIE_SATA2_SEL_SATA BIT(31)
30 #define SPEAR1310_PCIE_SATA1_SEL_SATA BIT(30)
31 #define SPEAR1310_PCIE_SATA0_SEL_SATA BIT(29)
32 #define SPEAR1310_SATA2_CFG_TX_CLK_EN BIT(27)
33 #define SPEAR1310_SATA2_CFG_RX_CLK_EN BIT(26)
34 #define SPEAR1310_SATA2_CFG_POWERUP_RESET BIT(25)
35 #define SPEAR1310_SATA2_CFG_PM_CLK_EN BIT(24)
36 #define SPEAR1310_SATA1_CFG_TX_CLK_EN BIT(23)
37 #define SPEAR1310_SATA1_CFG_RX_CLK_EN BIT(22)
38 #define SPEAR1310_SATA1_CFG_POWERUP_RESET BIT(21)
39 #define SPEAR1310_SATA1_CFG_PM_CLK_EN BIT(20)
40 #define SPEAR1310_SATA0_CFG_TX_CLK_EN BIT(19)
41 #define SPEAR1310_SATA0_CFG_RX_CLK_EN BIT(18)
42 #define SPEAR1310_SATA0_CFG_POWERUP_RESET BIT(17)
43 #define SPEAR1310_SATA0_CFG_PM_CLK_EN BIT(16)
44 #define SPEAR1310_PCIE2_CFG_DEVICE_PRESENT BIT(11)
45 #define SPEAR1310_PCIE2_CFG_POWERUP_RESET BIT(10)
46 #define SPEAR1310_PCIE2_CFG_CORE_CLK_EN BIT(9)
47 #define SPEAR1310_PCIE2_CFG_AUX_CLK_EN BIT(8)
48 #define SPEAR1310_PCIE1_CFG_DEVICE_PRESENT BIT(7)
49 #define SPEAR1310_PCIE1_CFG_POWERUP_RESET BIT(6)
50 #define SPEAR1310_PCIE1_CFG_CORE_CLK_EN BIT(5)
51 #define SPEAR1310_PCIE1_CFG_AUX_CLK_EN BIT(4)
52 #define SPEAR1310_PCIE0_CFG_DEVICE_PRESENT BIT(3)
53 #define SPEAR1310_PCIE0_CFG_POWERUP_RESET BIT(2)
54 #define SPEAR1310_PCIE0_CFG_CORE_CLK_EN BIT(1)
55 #define SPEAR1310_PCIE0_CFG_AUX_CLK_EN BIT(0)
56
57 #define SPEAR1310_PCIE_CFG_MASK(x) ((0xF << (x * 4)) | BIT((x + 29)))
58 #define SPEAR1310_SATA_CFG_MASK(x) ((0xF << (x * 4 + 16)) | \
59 BIT((x + 29)))
60 #define SPEAR1310_PCIE_CFG_VAL(x) \
61 (SPEAR1310_PCIE_SATA##x##_SEL_PCIE | \
62 SPEAR1310_PCIE##x##_CFG_AUX_CLK_EN | \
63 SPEAR1310_PCIE##x##_CFG_CORE_CLK_EN | \
64 SPEAR1310_PCIE##x##_CFG_POWERUP_RESET | \
65 SPEAR1310_PCIE##x##_CFG_DEVICE_PRESENT)
66 #define SPEAR1310_SATA_CFG_VAL(x) \
67 (SPEAR1310_PCIE_SATA##x##_SEL_SATA | \
68 SPEAR1310_SATA##x##_CFG_PM_CLK_EN | \
69 SPEAR1310_SATA##x##_CFG_POWERUP_RESET | \
70 SPEAR1310_SATA##x##_CFG_RX_CLK_EN | \
71 SPEAR1310_SATA##x##_CFG_TX_CLK_EN)
72
73#define SPEAR1310_PCIE_MIPHY_CFG_1 0x3A8
74 #define SPEAR1310_MIPHY_DUAL_OSC_BYPASS_EXT BIT(31)
75 #define SPEAR1310_MIPHY_DUAL_CLK_REF_DIV2 BIT(28)
76 #define SPEAR1310_MIPHY_DUAL_PLL_RATIO_TOP(x) (x << 16)
77 #define SPEAR1310_MIPHY_SINGLE_OSC_BYPASS_EXT BIT(15)
78 #define SPEAR1310_MIPHY_SINGLE_CLK_REF_DIV2 BIT(12)
79 #define SPEAR1310_MIPHY_SINGLE_PLL_RATIO_TOP(x) (x << 0)
80 #define SPEAR1310_PCIE_SATA_MIPHY_CFG_SATA_MASK (0xFFFF)
81 #define SPEAR1310_PCIE_SATA_MIPHY_CFG_PCIE_MASK (0xFFFF << 16)
82 #define SPEAR1310_PCIE_SATA_MIPHY_CFG_SATA \
83 (SPEAR1310_MIPHY_DUAL_OSC_BYPASS_EXT | \
84 SPEAR1310_MIPHY_DUAL_CLK_REF_DIV2 | \
85 SPEAR1310_MIPHY_DUAL_PLL_RATIO_TOP(60) | \
86 SPEAR1310_MIPHY_SINGLE_OSC_BYPASS_EXT | \
87 SPEAR1310_MIPHY_SINGLE_CLK_REF_DIV2 | \
88 SPEAR1310_MIPHY_SINGLE_PLL_RATIO_TOP(60))
89 #define SPEAR1310_PCIE_SATA_MIPHY_CFG_SATA_25M_CRYSTAL_CLK \
90 (SPEAR1310_MIPHY_SINGLE_PLL_RATIO_TOP(120))
91 #define SPEAR1310_PCIE_SATA_MIPHY_CFG_PCIE \
92 (SPEAR1310_MIPHY_DUAL_OSC_BYPASS_EXT | \
93 SPEAR1310_MIPHY_DUAL_PLL_RATIO_TOP(25) | \
94 SPEAR1310_MIPHY_SINGLE_OSC_BYPASS_EXT | \
95 SPEAR1310_MIPHY_SINGLE_PLL_RATIO_TOP(25))
96
97#define SPEAR1310_PCIE_MIPHY_CFG_2 0x3AC
98
99enum spear1310_miphy_mode {
100 SATA,
101 PCIE,
102};
103
104struct spear1310_miphy_priv {
105 /* instance id of this phy */
106 u32 id;
107 /* phy mode: 0 for SATA 1 for PCIe */
108 enum spear1310_miphy_mode mode;
109 /* regmap for any soc specific misc registers */
110 struct regmap *misc;
111 /* phy struct pointer */
112 struct phy *phy;
113};
114
115static int spear1310_miphy_pcie_init(struct spear1310_miphy_priv *priv)
116{
117 u32 val;
118
119 regmap_update_bits(priv->misc, SPEAR1310_PCIE_MIPHY_CFG_1,
120 SPEAR1310_PCIE_SATA_MIPHY_CFG_PCIE_MASK,
121 SPEAR1310_PCIE_SATA_MIPHY_CFG_PCIE);
122
123 switch (priv->id) {
124 case 0:
125 val = SPEAR1310_PCIE_CFG_VAL(0);
126 break;
127 case 1:
128 val = SPEAR1310_PCIE_CFG_VAL(1);
129 break;
130 case 2:
131 val = SPEAR1310_PCIE_CFG_VAL(2);
132 break;
133 default:
134 return -EINVAL;
135 }
136
137 regmap_update_bits(priv->misc, SPEAR1310_PCIE_SATA_CFG,
138 SPEAR1310_PCIE_CFG_MASK(priv->id), val);
139
140 return 0;
141}
142
143static int spear1310_miphy_pcie_exit(struct spear1310_miphy_priv *priv)
144{
145 regmap_update_bits(priv->misc, SPEAR1310_PCIE_SATA_CFG,
146 SPEAR1310_PCIE_CFG_MASK(priv->id), 0);
147
148 regmap_update_bits(priv->misc, SPEAR1310_PCIE_MIPHY_CFG_1,
149 SPEAR1310_PCIE_SATA_MIPHY_CFG_PCIE_MASK, 0);
150
151 return 0;
152}
153
154static int spear1310_miphy_init(struct phy *phy)
155{
156 struct spear1310_miphy_priv *priv = phy_get_drvdata(phy);
157 int ret = 0;
158
159 if (priv->mode == PCIE)
160 ret = spear1310_miphy_pcie_init(priv);
161
162 return ret;
163}
164
165static int spear1310_miphy_exit(struct phy *phy)
166{
167 struct spear1310_miphy_priv *priv = phy_get_drvdata(phy);
168 int ret = 0;
169
170 if (priv->mode == PCIE)
171 ret = spear1310_miphy_pcie_exit(priv);
172
173 return ret;
174}
175
176static const struct of_device_id spear1310_miphy_of_match[] = {
177 { .compatible = "st,spear1310-miphy" },
178 { },
179};
180MODULE_DEVICE_TABLE(of, spear1310_miphy_of_match);
181
182static const struct phy_ops spear1310_miphy_ops = {
183 .init = spear1310_miphy_init,
184 .exit = spear1310_miphy_exit,
185 .owner = THIS_MODULE,
186};
187
188static struct phy *spear1310_miphy_xlate(struct device *dev,
189 struct of_phandle_args *args)
190{
191 struct spear1310_miphy_priv *priv = dev_get_drvdata(dev);
192
193 if (args->args_count < 1) {
194 dev_err(dev, "DT did not pass correct no of args\n");
195 return ERR_PTR(-ENODEV);
196 }
197
198 priv->mode = args->args[0];
199
200 if (priv->mode != SATA && priv->mode != PCIE) {
201 dev_err(dev, "DT did not pass correct phy mode\n");
202 return ERR_PTR(-ENODEV);
203 }
204
205 return priv->phy;
206}
207
208static int spear1310_miphy_probe(struct platform_device *pdev)
209{
210 struct device *dev = &pdev->dev;
211 struct spear1310_miphy_priv *priv;
212 struct phy_provider *phy_provider;
213
214 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
215 if (!priv)
216 return -ENOMEM;
217
218 priv->misc =
219 syscon_regmap_lookup_by_phandle(dev->of_node, "misc");
220 if (IS_ERR(priv->misc)) {
221 dev_err(dev, "failed to find misc regmap\n");
222 return PTR_ERR(priv->misc);
223 }
224
225 if (of_property_read_u32(dev->of_node, "phy-id", &priv->id)) {
226 dev_err(dev, "failed to find phy id\n");
227 return -EINVAL;
228 }
229
230 priv->phy = devm_phy_create(dev, NULL, &spear1310_miphy_ops);
231 if (IS_ERR(priv->phy)) {
232 dev_err(dev, "failed to create SATA PCIe PHY\n");
233 return PTR_ERR(priv->phy);
234 }
235
236 dev_set_drvdata(dev, priv);
237 phy_set_drvdata(priv->phy, priv);
238
239 phy_provider =
240 devm_of_phy_provider_register(dev, spear1310_miphy_xlate);
241 if (IS_ERR(phy_provider)) {
242 dev_err(dev, "failed to register phy provider\n");
243 return PTR_ERR(phy_provider);
244 }
245
246 return 0;
247}
248
249static struct platform_driver spear1310_miphy_driver = {
250 .probe = spear1310_miphy_probe,
251 .driver = {
252 .name = "spear1310-miphy",
253 .of_match_table = of_match_ptr(spear1310_miphy_of_match),
254 },
255};
256
257module_platform_driver(spear1310_miphy_driver);
258
259MODULE_DESCRIPTION("ST SPEAR1310-MIPHY driver");
260MODULE_AUTHOR("Pratyush Anand <pratyush.anand@gmail.com>");
261MODULE_LICENSE("GPL v2");