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[thirdparty/kernel/stable.git] / drivers / phy / samsung / phy-exynos-pcie.c
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d2912cb1 1// SPDX-License-Identifier: GPL-2.0-only
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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>
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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>
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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
62struct exynos_pcie_phy_data {
63 const struct phy_ops *ops;
64};
65
66/* For Exynos pcie phy */
67struct 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
73static void exynos_pcie_phy_writel(void __iomem *base, u32 val, u32 offset)
74{
75 writel(val, base + offset);
76}
77
78static u32 exynos_pcie_phy_readl(void __iomem *base, u32 offset)
79{
80 return readl(base + offset);
81}
82
83/* For Exynos5440 specific functions */
84static 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
131static 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
164static 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
198static 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
209static 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
217static const struct exynos_pcie_phy_data exynos5440_pcie_phy_data = {
218 .ops = &exynos5440_phy_ops,
219};
220
221static 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};
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228
229static 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);
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253 if (IS_ERR(exynos_phy->blk_base))
254 return PTR_ERR(exynos_phy->blk_base);
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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
270static 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 278builtin_platform_driver(exynos_pcie_phy_driver);