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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
cf0adb8e JC |
2 | /* |
3 | * Samsung EXYNOS SoC series PCIe PHY driver | |
4 | * | |
5 | * Phy provider for PCIe controller on Exynos SoC series | |
6 | * | |
7 | * Copyright (C) 2017 Samsung Electronics Co., Ltd. | |
8 | * Jaehoon Chung <jh80.chung@samsung.com> | |
cf0adb8e JC |
9 | */ |
10 | ||
11 | #include <linux/delay.h> | |
12 | #include <linux/io.h> | |
13 | #include <linux/iopoll.h> | |
4574a92c | 14 | #include <linux/init.h> |
cf0adb8e | 15 | #include <linux/mfd/syscon.h> |
cf0adb8e JC |
16 | #include <linux/of.h> |
17 | #include <linux/of_address.h> | |
18 | #include <linux/of_platform.h> | |
19 | #include <linux/platform_device.h> | |
20 | #include <linux/phy/phy.h> | |
21 | #include <linux/regmap.h> | |
22 | ||
23 | /* PCIe Purple registers */ | |
24 | #define PCIE_PHY_GLOBAL_RESET 0x000 | |
25 | #define PCIE_PHY_COMMON_RESET 0x004 | |
26 | #define PCIE_PHY_CMN_REG 0x008 | |
27 | #define PCIE_PHY_MAC_RESET 0x00c | |
28 | #define PCIE_PHY_PLL_LOCKED 0x010 | |
29 | #define PCIE_PHY_TRSVREG_RESET 0x020 | |
30 | #define PCIE_PHY_TRSV_RESET 0x024 | |
31 | ||
32 | /* PCIe PHY registers */ | |
33 | #define PCIE_PHY_IMPEDANCE 0x004 | |
34 | #define PCIE_PHY_PLL_DIV_0 0x008 | |
35 | #define PCIE_PHY_PLL_BIAS 0x00c | |
36 | #define PCIE_PHY_DCC_FEEDBACK 0x014 | |
37 | #define PCIE_PHY_PLL_DIV_1 0x05c | |
38 | #define PCIE_PHY_COMMON_POWER 0x064 | |
39 | #define PCIE_PHY_COMMON_PD_CMN BIT(3) | |
40 | #define PCIE_PHY_TRSV0_EMP_LVL 0x084 | |
41 | #define PCIE_PHY_TRSV0_DRV_LVL 0x088 | |
42 | #define PCIE_PHY_TRSV0_RXCDR 0x0ac | |
43 | #define PCIE_PHY_TRSV0_POWER 0x0c4 | |
44 | #define PCIE_PHY_TRSV0_PD_TSV BIT(7) | |
45 | #define PCIE_PHY_TRSV0_LVCC 0x0dc | |
46 | #define PCIE_PHY_TRSV1_EMP_LVL 0x144 | |
47 | #define PCIE_PHY_TRSV1_RXCDR 0x16c | |
48 | #define PCIE_PHY_TRSV1_POWER 0x184 | |
49 | #define PCIE_PHY_TRSV1_PD_TSV BIT(7) | |
50 | #define PCIE_PHY_TRSV1_LVCC 0x19c | |
51 | #define PCIE_PHY_TRSV2_EMP_LVL 0x204 | |
52 | #define PCIE_PHY_TRSV2_RXCDR 0x22c | |
53 | #define PCIE_PHY_TRSV2_POWER 0x244 | |
54 | #define PCIE_PHY_TRSV2_PD_TSV BIT(7) | |
55 | #define PCIE_PHY_TRSV2_LVCC 0x25c | |
56 | #define PCIE_PHY_TRSV3_EMP_LVL 0x2c4 | |
57 | #define PCIE_PHY_TRSV3_RXCDR 0x2ec | |
58 | #define PCIE_PHY_TRSV3_POWER 0x304 | |
59 | #define PCIE_PHY_TRSV3_PD_TSV BIT(7) | |
60 | #define PCIE_PHY_TRSV3_LVCC 0x31c | |
61 | ||
62 | struct exynos_pcie_phy_data { | |
63 | const struct phy_ops *ops; | |
64 | }; | |
65 | ||
66 | /* For Exynos pcie phy */ | |
67 | struct exynos_pcie_phy { | |
68 | const struct exynos_pcie_phy_data *drv_data; | |
69 | void __iomem *phy_base; | |
70 | void __iomem *blk_base; /* For exynos5440 */ | |
71 | }; | |
72 | ||
73 | static void exynos_pcie_phy_writel(void __iomem *base, u32 val, u32 offset) | |
74 | { | |
75 | writel(val, base + offset); | |
76 | } | |
77 | ||
78 | static u32 exynos_pcie_phy_readl(void __iomem *base, u32 offset) | |
79 | { | |
80 | return readl(base + offset); | |
81 | } | |
82 | ||
83 | /* For Exynos5440 specific functions */ | |
84 | static int exynos5440_pcie_phy_init(struct phy *phy) | |
85 | { | |
86 | struct exynos_pcie_phy *ep = phy_get_drvdata(phy); | |
87 | ||
88 | /* DCC feedback control off */ | |
89 | exynos_pcie_phy_writel(ep->phy_base, 0x29, PCIE_PHY_DCC_FEEDBACK); | |
90 | ||
91 | /* set TX/RX impedance */ | |
92 | exynos_pcie_phy_writel(ep->phy_base, 0xd5, PCIE_PHY_IMPEDANCE); | |
93 | ||
94 | /* set 50Mhz PHY clock */ | |
95 | exynos_pcie_phy_writel(ep->phy_base, 0x14, PCIE_PHY_PLL_DIV_0); | |
96 | exynos_pcie_phy_writel(ep->phy_base, 0x12, PCIE_PHY_PLL_DIV_1); | |
97 | ||
98 | /* set TX Differential output for lane 0 */ | |
99 | exynos_pcie_phy_writel(ep->phy_base, 0x7f, PCIE_PHY_TRSV0_DRV_LVL); | |
100 | ||
101 | /* set TX Pre-emphasis Level Control for lane 0 to minimum */ | |
102 | exynos_pcie_phy_writel(ep->phy_base, 0x0, PCIE_PHY_TRSV0_EMP_LVL); | |
103 | ||
104 | /* set RX clock and data recovery bandwidth */ | |
105 | exynos_pcie_phy_writel(ep->phy_base, 0xe7, PCIE_PHY_PLL_BIAS); | |
106 | exynos_pcie_phy_writel(ep->phy_base, 0x82, PCIE_PHY_TRSV0_RXCDR); | |
107 | exynos_pcie_phy_writel(ep->phy_base, 0x82, PCIE_PHY_TRSV1_RXCDR); | |
108 | exynos_pcie_phy_writel(ep->phy_base, 0x82, PCIE_PHY_TRSV2_RXCDR); | |
109 | exynos_pcie_phy_writel(ep->phy_base, 0x82, PCIE_PHY_TRSV3_RXCDR); | |
110 | ||
111 | /* change TX Pre-emphasis Level Control for lanes */ | |
112 | exynos_pcie_phy_writel(ep->phy_base, 0x39, PCIE_PHY_TRSV0_EMP_LVL); | |
113 | exynos_pcie_phy_writel(ep->phy_base, 0x39, PCIE_PHY_TRSV1_EMP_LVL); | |
114 | exynos_pcie_phy_writel(ep->phy_base, 0x39, PCIE_PHY_TRSV2_EMP_LVL); | |
115 | exynos_pcie_phy_writel(ep->phy_base, 0x39, PCIE_PHY_TRSV3_EMP_LVL); | |
116 | ||
117 | /* set LVCC */ | |
118 | exynos_pcie_phy_writel(ep->phy_base, 0x20, PCIE_PHY_TRSV0_LVCC); | |
119 | exynos_pcie_phy_writel(ep->phy_base, 0xa0, PCIE_PHY_TRSV1_LVCC); | |
120 | exynos_pcie_phy_writel(ep->phy_base, 0xa0, PCIE_PHY_TRSV2_LVCC); | |
121 | exynos_pcie_phy_writel(ep->phy_base, 0xa0, PCIE_PHY_TRSV3_LVCC); | |
122 | ||
123 | /* pulse for common reset */ | |
124 | exynos_pcie_phy_writel(ep->blk_base, 1, PCIE_PHY_COMMON_RESET); | |
125 | udelay(500); | |
126 | exynos_pcie_phy_writel(ep->blk_base, 0, PCIE_PHY_COMMON_RESET); | |
127 | ||
128 | return 0; | |
129 | } | |
130 | ||
131 | static int exynos5440_pcie_phy_power_on(struct phy *phy) | |
132 | { | |
133 | struct exynos_pcie_phy *ep = phy_get_drvdata(phy); | |
134 | u32 val; | |
135 | ||
136 | exynos_pcie_phy_writel(ep->blk_base, 0, PCIE_PHY_COMMON_RESET); | |
137 | exynos_pcie_phy_writel(ep->blk_base, 0, PCIE_PHY_CMN_REG); | |
138 | exynos_pcie_phy_writel(ep->blk_base, 0, PCIE_PHY_TRSVREG_RESET); | |
139 | exynos_pcie_phy_writel(ep->blk_base, 0, PCIE_PHY_TRSV_RESET); | |
140 | ||
141 | val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_COMMON_POWER); | |
142 | val &= ~PCIE_PHY_COMMON_PD_CMN; | |
143 | exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_COMMON_POWER); | |
144 | ||
145 | val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_TRSV0_POWER); | |
146 | val &= ~PCIE_PHY_TRSV0_PD_TSV; | |
147 | exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_TRSV0_POWER); | |
148 | ||
149 | val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_TRSV1_POWER); | |
150 | val &= ~PCIE_PHY_TRSV1_PD_TSV; | |
151 | exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_TRSV1_POWER); | |
152 | ||
153 | val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_TRSV2_POWER); | |
154 | val &= ~PCIE_PHY_TRSV2_PD_TSV; | |
155 | exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_TRSV2_POWER); | |
156 | ||
157 | val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_TRSV3_POWER); | |
158 | val &= ~PCIE_PHY_TRSV3_PD_TSV; | |
159 | exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_TRSV3_POWER); | |
160 | ||
161 | return 0; | |
162 | } | |
163 | ||
164 | static int exynos5440_pcie_phy_power_off(struct phy *phy) | |
165 | { | |
166 | struct exynos_pcie_phy *ep = phy_get_drvdata(phy); | |
167 | u32 val; | |
168 | ||
169 | if (readl_poll_timeout(ep->phy_base + PCIE_PHY_PLL_LOCKED, val, | |
170 | (val != 0), 1, 500)) { | |
171 | dev_err(&phy->dev, "PLL Locked: 0x%x\n", val); | |
172 | return -ETIMEDOUT; | |
173 | } | |
174 | ||
175 | val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_COMMON_POWER); | |
176 | val |= PCIE_PHY_COMMON_PD_CMN; | |
177 | exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_COMMON_POWER); | |
178 | ||
179 | val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_TRSV0_POWER); | |
180 | val |= PCIE_PHY_TRSV0_PD_TSV; | |
181 | exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_TRSV0_POWER); | |
182 | ||
183 | val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_TRSV1_POWER); | |
184 | val |= PCIE_PHY_TRSV1_PD_TSV; | |
185 | exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_TRSV1_POWER); | |
186 | ||
187 | val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_TRSV2_POWER); | |
188 | val |= PCIE_PHY_TRSV2_PD_TSV; | |
189 | exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_TRSV2_POWER); | |
190 | ||
191 | val = exynos_pcie_phy_readl(ep->phy_base, PCIE_PHY_TRSV3_POWER); | |
192 | val |= PCIE_PHY_TRSV3_PD_TSV; | |
193 | exynos_pcie_phy_writel(ep->phy_base, val, PCIE_PHY_TRSV3_POWER); | |
194 | ||
195 | return 0; | |
196 | } | |
197 | ||
198 | static int exynos5440_pcie_phy_reset(struct phy *phy) | |
199 | { | |
200 | struct exynos_pcie_phy *ep = phy_get_drvdata(phy); | |
201 | ||
202 | exynos_pcie_phy_writel(ep->blk_base, 0, PCIE_PHY_MAC_RESET); | |
203 | exynos_pcie_phy_writel(ep->blk_base, 1, PCIE_PHY_GLOBAL_RESET); | |
204 | exynos_pcie_phy_writel(ep->blk_base, 0, PCIE_PHY_GLOBAL_RESET); | |
205 | ||
206 | return 0; | |
207 | } | |
208 | ||
209 | static const struct phy_ops exynos5440_phy_ops = { | |
210 | .init = exynos5440_pcie_phy_init, | |
211 | .power_on = exynos5440_pcie_phy_power_on, | |
212 | .power_off = exynos5440_pcie_phy_power_off, | |
213 | .reset = exynos5440_pcie_phy_reset, | |
214 | .owner = THIS_MODULE, | |
215 | }; | |
216 | ||
217 | static const struct exynos_pcie_phy_data exynos5440_pcie_phy_data = { | |
218 | .ops = &exynos5440_phy_ops, | |
219 | }; | |
220 | ||
221 | static const struct of_device_id exynos_pcie_phy_match[] = { | |
222 | { | |
223 | .compatible = "samsung,exynos5440-pcie-phy", | |
224 | .data = &exynos5440_pcie_phy_data, | |
225 | }, | |
226 | {}, | |
227 | }; | |
cf0adb8e JC |
228 | |
229 | static int exynos_pcie_phy_probe(struct platform_device *pdev) | |
230 | { | |
231 | struct device *dev = &pdev->dev; | |
232 | struct exynos_pcie_phy *exynos_phy; | |
233 | struct phy *generic_phy; | |
234 | struct phy_provider *phy_provider; | |
235 | struct resource *res; | |
236 | const struct exynos_pcie_phy_data *drv_data; | |
237 | ||
238 | drv_data = of_device_get_match_data(dev); | |
239 | if (!drv_data) | |
240 | return -ENODEV; | |
241 | ||
242 | exynos_phy = devm_kzalloc(dev, sizeof(*exynos_phy), GFP_KERNEL); | |
243 | if (!exynos_phy) | |
244 | return -ENOMEM; | |
245 | ||
246 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
247 | exynos_phy->phy_base = devm_ioremap_resource(dev, res); | |
248 | if (IS_ERR(exynos_phy->phy_base)) | |
249 | return PTR_ERR(exynos_phy->phy_base); | |
250 | ||
251 | res = platform_get_resource(pdev, IORESOURCE_MEM, 1); | |
252 | exynos_phy->blk_base = devm_ioremap_resource(dev, res); | |
11d94e02 JC |
253 | if (IS_ERR(exynos_phy->blk_base)) |
254 | return PTR_ERR(exynos_phy->blk_base); | |
cf0adb8e JC |
255 | |
256 | exynos_phy->drv_data = drv_data; | |
257 | ||
258 | generic_phy = devm_phy_create(dev, dev->of_node, drv_data->ops); | |
259 | if (IS_ERR(generic_phy)) { | |
260 | dev_err(dev, "failed to create PHY\n"); | |
261 | return PTR_ERR(generic_phy); | |
262 | } | |
263 | ||
264 | phy_set_drvdata(generic_phy, exynos_phy); | |
265 | phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); | |
266 | ||
267 | return PTR_ERR_OR_ZERO(phy_provider); | |
268 | } | |
269 | ||
270 | static struct platform_driver exynos_pcie_phy_driver = { | |
271 | .probe = exynos_pcie_phy_probe, | |
272 | .driver = { | |
273 | .of_match_table = exynos_pcie_phy_match, | |
274 | .name = "exynos_pcie_phy", | |
275 | } | |
276 | }; | |
cf0adb8e | 277 | |
4574a92c | 278 | builtin_platform_driver(exynos_pcie_phy_driver); |