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10#include <linux/clk.h>
11#include <linux/delay.h>
12#include <linux/io.h>
13#include <linux/i2c.h>
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/of.h>
17#include <linux/of_address.h>
18#include <linux/phy/phy.h>
19#include <linux/platform_device.h>
20#include <linux/regmap.h>
21#include <linux/spinlock.h>
22#include <linux/mfd/syscon.h>
23
24#define SATAPHY_CONTROL_OFFSET 0x0724
25#define EXYNOS5_SATAPHY_PMU_ENABLE BIT(0)
26#define EXYNOS5_SATA_RESET 0x4
27#define RESET_GLOBAL_RST_N BIT(0)
28#define RESET_CMN_RST_N BIT(1)
29#define RESET_CMN_BLOCK_RST_N BIT(2)
30#define RESET_CMN_I2C_RST_N BIT(3)
31#define RESET_TX_RX_PIPE_RST_N BIT(4)
32#define RESET_TX_RX_BLOCK_RST_N BIT(5)
33#define RESET_TX_RX_I2C_RST_N (BIT(6) | BIT(7))
34#define LINK_RESET 0xf0000
35#define EXYNOS5_SATA_MODE0 0x10
36#define SATA_SPD_GEN3 BIT(1)
37#define EXYNOS5_SATA_CTRL0 0x14
38#define CTRL0_P0_PHY_CALIBRATED_SEL BIT(9)
39#define CTRL0_P0_PHY_CALIBRATED BIT(8)
40#define EXYNOS5_SATA_PHSATA_CTRLM 0xe0
41#define PHCTRLM_REF_RATE BIT(1)
42#define PHCTRLM_HIGH_SPEED BIT(0)
43#define EXYNOS5_SATA_PHSATA_STATM 0xf0
44#define PHSTATM_PLL_LOCKED BIT(0)
45
46#define PHY_PLL_TIMEOUT (usecs_to_jiffies(1000))
47
48struct exynos_sata_phy {
49 struct phy *phy;
50 struct clk *phyclk;
51 void __iomem *regs;
52 struct regmap *pmureg;
53 struct i2c_client *client;
54};
55
56static int wait_for_reg_status(void __iomem *base, u32 reg, u32 checkbit,
57 u32 status)
58{
59 unsigned long timeout = jiffies + PHY_PLL_TIMEOUT;
60
61 while (time_before(jiffies, timeout)) {
62 if ((readl(base + reg) & checkbit) == status)
63 return 0;
64 }
65
66 return -EFAULT;
67}
68
69static int exynos_sata_phy_power_on(struct phy *phy)
70{
71 struct exynos_sata_phy *sata_phy = phy_get_drvdata(phy);
72
73 return regmap_update_bits(sata_phy->pmureg, SATAPHY_CONTROL_OFFSET,
74 EXYNOS5_SATAPHY_PMU_ENABLE, true);
75
76}
77
78static int exynos_sata_phy_power_off(struct phy *phy)
79{
80 struct exynos_sata_phy *sata_phy = phy_get_drvdata(phy);
81
82 return regmap_update_bits(sata_phy->pmureg, SATAPHY_CONTROL_OFFSET,
83 EXYNOS5_SATAPHY_PMU_ENABLE, false);
84
85}
86
87static int exynos_sata_phy_init(struct phy *phy)
88{
89 u32 val = 0;
90 int ret = 0;
91 u8 buf[] = { 0x3a, 0x0b };
92 struct exynos_sata_phy *sata_phy = phy_get_drvdata(phy);
93
94 ret = regmap_update_bits(sata_phy->pmureg, SATAPHY_CONTROL_OFFSET,
95 EXYNOS5_SATAPHY_PMU_ENABLE, true);
96 if (ret != 0)
97 dev_err(&sata_phy->phy->dev, "phy init failed\n");
98
99 writel(val, sata_phy->regs + EXYNOS5_SATA_RESET);
100
101 val = readl(sata_phy->regs + EXYNOS5_SATA_RESET);
102 val |= RESET_GLOBAL_RST_N | RESET_CMN_RST_N | RESET_CMN_BLOCK_RST_N
103 | RESET_CMN_I2C_RST_N | RESET_TX_RX_PIPE_RST_N
104 | RESET_TX_RX_BLOCK_RST_N | RESET_TX_RX_I2C_RST_N;
105 writel(val, sata_phy->regs + EXYNOS5_SATA_RESET);
106
107 val = readl(sata_phy->regs + EXYNOS5_SATA_RESET);
108 val |= LINK_RESET;
109 writel(val, sata_phy->regs + EXYNOS5_SATA_RESET);
110
111 val = readl(sata_phy->regs + EXYNOS5_SATA_RESET);
112 val |= RESET_CMN_RST_N;
113 writel(val, sata_phy->regs + EXYNOS5_SATA_RESET);
114
115 val = readl(sata_phy->regs + EXYNOS5_SATA_PHSATA_CTRLM);
116 val &= ~PHCTRLM_REF_RATE;
117 writel(val, sata_phy->regs + EXYNOS5_SATA_PHSATA_CTRLM);
118
119
120 val = readl(sata_phy->regs + EXYNOS5_SATA_PHSATA_CTRLM);
121 val |= PHCTRLM_HIGH_SPEED;
122 writel(val, sata_phy->regs + EXYNOS5_SATA_PHSATA_CTRLM);
123
124 val = readl(sata_phy->regs + EXYNOS5_SATA_CTRL0);
125 val |= CTRL0_P0_PHY_CALIBRATED_SEL | CTRL0_P0_PHY_CALIBRATED;
126 writel(val, sata_phy->regs + EXYNOS5_SATA_CTRL0);
127
128 val = readl(sata_phy->regs + EXYNOS5_SATA_MODE0);
129 val |= SATA_SPD_GEN3;
130 writel(val, sata_phy->regs + EXYNOS5_SATA_MODE0);
131
132 ret = i2c_master_send(sata_phy->client, buf, sizeof(buf));
133 if (ret < 0)
134 return ret;
135
136
137 val = readl(sata_phy->regs + EXYNOS5_SATA_RESET);
138 val &= ~RESET_CMN_RST_N;
139 writel(val, sata_phy->regs + EXYNOS5_SATA_RESET);
140
141 val = readl(sata_phy->regs + EXYNOS5_SATA_RESET);
142 val |= RESET_CMN_RST_N;
143 writel(val, sata_phy->regs + EXYNOS5_SATA_RESET);
144
145 ret = wait_for_reg_status(sata_phy->regs,
146 EXYNOS5_SATA_PHSATA_STATM,
147 PHSTATM_PLL_LOCKED, 1);
148 if (ret < 0)
149 dev_err(&sata_phy->phy->dev,
150 "PHY PLL locking failed\n");
151 return ret;
152}
153
154static const struct phy_ops exynos_sata_phy_ops = {
155 .init = exynos_sata_phy_init,
156 .power_on = exynos_sata_phy_power_on,
157 .power_off = exynos_sata_phy_power_off,
158 .owner = THIS_MODULE,
159};
160
161static int exynos_sata_phy_probe(struct platform_device *pdev)
162{
163 struct exynos_sata_phy *sata_phy;
164 struct device *dev = &pdev->dev;
165 struct resource *res;
166 struct phy_provider *phy_provider;
167 struct device_node *node;
168 int ret = 0;
169
170 sata_phy = devm_kzalloc(dev, sizeof(*sata_phy), GFP_KERNEL);
171 if (!sata_phy)
172 return -ENOMEM;
173
174 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
175
176 sata_phy->regs = devm_ioremap_resource(dev, res);
177 if (IS_ERR(sata_phy->regs))
178 return PTR_ERR(sata_phy->regs);
179
180 sata_phy->pmureg = syscon_regmap_lookup_by_phandle(dev->of_node,
181 "samsung,syscon-phandle");
182 if (IS_ERR(sata_phy->pmureg)) {
183 dev_err(dev, "syscon regmap lookup failed.\n");
184 return PTR_ERR(sata_phy->pmureg);
185 }
186
187 node = of_parse_phandle(dev->of_node,
188 "samsung,exynos-sataphy-i2c-phandle", 0);
189 if (!node)
190 return -EINVAL;
191
192 sata_phy->client = of_find_i2c_device_by_node(node);
193 if (!sata_phy->client)
194 return -EPROBE_DEFER;
195
196 dev_set_drvdata(dev, sata_phy);
197
198 sata_phy->phyclk = devm_clk_get(dev, "sata_phyctrl");
199 if (IS_ERR(sata_phy->phyclk)) {
200 dev_err(dev, "failed to get clk for PHY\n");
201 return PTR_ERR(sata_phy->phyclk);
202 }
203
204 ret = clk_prepare_enable(sata_phy->phyclk);
205 if (ret < 0) {
206 dev_err(dev, "failed to enable source clk\n");
207 return ret;
208 }
209
210 sata_phy->phy = devm_phy_create(dev, NULL, &exynos_sata_phy_ops);
211 if (IS_ERR(sata_phy->phy)) {
212 clk_disable_unprepare(sata_phy->phyclk);
213 dev_err(dev, "failed to create PHY\n");
214 return PTR_ERR(sata_phy->phy);
215 }
216
217 phy_set_drvdata(sata_phy->phy, sata_phy);
218
219 phy_provider = devm_of_phy_provider_register(dev,
220 of_phy_simple_xlate);
221 if (IS_ERR(phy_provider)) {
222 clk_disable_unprepare(sata_phy->phyclk);
223 return PTR_ERR(phy_provider);
224 }
225
226 return 0;
227}
228
229static const struct of_device_id exynos_sata_phy_of_match[] = {
230 { .compatible = "samsung,exynos5250-sata-phy" },
231 { },
232};
233MODULE_DEVICE_TABLE(of, exynos_sata_phy_of_match);
234
235static struct platform_driver exynos_sata_phy_driver = {
236 .probe = exynos_sata_phy_probe,
237 .driver = {
238 .of_match_table = exynos_sata_phy_of_match,
239 .name = "samsung,sata-phy",
240 .suppress_bind_attrs = true,
241 }
242};
243module_platform_driver(exynos_sata_phy_driver);
244
245MODULE_DESCRIPTION("Samsung SerDes PHY driver");
246MODULE_LICENSE("GPL v2");
247MODULE_AUTHOR("Girish K S <ks.giri@samsung.com>");
248MODULE_AUTHOR("Yuvaraj C D <yuvaraj.cd@samsung.com>");
249
