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ba4bdc9e HG |
1 | /* |
2 | * Allwinner sun4i USB phy driver | |
3 | * | |
4 | * Copyright (C) 2014 Hans de Goede <hdegoede@redhat.com> | |
5 | * | |
6 | * Based on code from | |
7 | * Allwinner Technology Co., Ltd. <www.allwinnertech.com> | |
8 | * | |
9 | * Modelled after: Samsung S5P/EXYNOS SoC series MIPI CSIS/DSIM DPHY driver | |
10 | * Copyright (C) 2013 Samsung Electronics Co., Ltd. | |
11 | * Author: Sylwester Nawrocki <s.nawrocki@samsung.com> | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License as published by | |
15 | * the Free Software Foundation; either version 2 of the License, or | |
16 | * (at your option) any later version. | |
17 | * | |
18 | * This program is distributed in the hope that it will be useful, | |
19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | * GNU General Public License for more details. | |
22 | */ | |
23 | ||
24 | #include <linux/clk.h> | |
25 | #include <linux/io.h> | |
26 | #include <linux/kernel.h> | |
27 | #include <linux/module.h> | |
28 | #include <linux/mutex.h> | |
29 | #include <linux/of.h> | |
30 | #include <linux/of_address.h> | |
31 | #include <linux/phy/phy.h> | |
32 | #include <linux/platform_device.h> | |
33 | #include <linux/regulator/consumer.h> | |
34 | #include <linux/reset.h> | |
35 | ||
36 | #define REG_ISCR 0x00 | |
37 | #define REG_PHYCTL 0x04 | |
38 | #define REG_PHYBIST 0x08 | |
39 | #define REG_PHYTUNE 0x0c | |
40 | ||
41 | #define PHYCTL_DATA BIT(7) | |
42 | ||
43 | #define SUNXI_AHB_ICHR8_EN BIT(10) | |
44 | #define SUNXI_AHB_INCR4_BURST_EN BIT(9) | |
45 | #define SUNXI_AHB_INCRX_ALIGN_EN BIT(8) | |
46 | #define SUNXI_ULPI_BYPASS_EN BIT(0) | |
47 | ||
48 | /* Common Control Bits for Both PHYs */ | |
49 | #define PHY_PLL_BW 0x03 | |
50 | #define PHY_RES45_CAL_EN 0x0c | |
51 | ||
52 | /* Private Control Bits for Each PHY */ | |
53 | #define PHY_TX_AMPLITUDE_TUNE 0x20 | |
54 | #define PHY_TX_SLEWRATE_TUNE 0x22 | |
55 | #define PHY_VBUSVALID_TH_SEL 0x25 | |
56 | #define PHY_PULLUP_RES_SEL 0x27 | |
57 | #define PHY_OTG_FUNC_EN 0x28 | |
58 | #define PHY_VBUS_DET_EN 0x29 | |
59 | #define PHY_DISCON_TH_SEL 0x2a | |
60 | ||
61 | #define MAX_PHYS 3 | |
62 | ||
63 | struct sun4i_usb_phy_data { | |
64 | struct clk *clk; | |
65 | void __iomem *base; | |
66 | struct mutex mutex; | |
67 | int num_phys; | |
68 | u32 disc_thresh; | |
69 | struct sun4i_usb_phy { | |
70 | struct phy *phy; | |
71 | void __iomem *pmu; | |
72 | struct regulator *vbus; | |
73 | struct reset_control *reset; | |
74 | int index; | |
75 | } phys[MAX_PHYS]; | |
76 | }; | |
77 | ||
78 | #define to_sun4i_usb_phy_data(phy) \ | |
79 | container_of((phy), struct sun4i_usb_phy_data, phys[(phy)->index]) | |
80 | ||
81 | static void sun4i_usb_phy_write(struct sun4i_usb_phy *phy, u32 addr, u32 data, | |
82 | int len) | |
83 | { | |
84 | struct sun4i_usb_phy_data *phy_data = to_sun4i_usb_phy_data(phy); | |
85 | u32 temp, usbc_bit = BIT(phy->index * 2); | |
86 | int i; | |
87 | ||
88 | mutex_lock(&phy_data->mutex); | |
89 | ||
90 | for (i = 0; i < len; i++) { | |
91 | temp = readl(phy_data->base + REG_PHYCTL); | |
92 | ||
93 | /* clear the address portion */ | |
94 | temp &= ~(0xff << 8); | |
95 | ||
96 | /* set the address */ | |
97 | temp |= ((addr + i) << 8); | |
98 | writel(temp, phy_data->base + REG_PHYCTL); | |
99 | ||
100 | /* set the data bit and clear usbc bit*/ | |
101 | temp = readb(phy_data->base + REG_PHYCTL); | |
102 | if (data & 0x1) | |
103 | temp |= PHYCTL_DATA; | |
104 | else | |
105 | temp &= ~PHYCTL_DATA; | |
106 | temp &= ~usbc_bit; | |
107 | writeb(temp, phy_data->base + REG_PHYCTL); | |
108 | ||
109 | /* pulse usbc_bit */ | |
110 | temp = readb(phy_data->base + REG_PHYCTL); | |
111 | temp |= usbc_bit; | |
112 | writeb(temp, phy_data->base + REG_PHYCTL); | |
113 | ||
114 | temp = readb(phy_data->base + REG_PHYCTL); | |
115 | temp &= ~usbc_bit; | |
116 | writeb(temp, phy_data->base + REG_PHYCTL); | |
117 | ||
118 | data >>= 1; | |
119 | } | |
120 | mutex_unlock(&phy_data->mutex); | |
121 | } | |
122 | ||
123 | static void sun4i_usb_phy_passby(struct sun4i_usb_phy *phy, int enable) | |
124 | { | |
125 | u32 bits, reg_value; | |
126 | ||
127 | if (!phy->pmu) | |
128 | return; | |
129 | ||
130 | bits = SUNXI_AHB_ICHR8_EN | SUNXI_AHB_INCR4_BURST_EN | | |
131 | SUNXI_AHB_INCRX_ALIGN_EN | SUNXI_ULPI_BYPASS_EN; | |
132 | ||
133 | reg_value = readl(phy->pmu); | |
134 | ||
135 | if (enable) | |
136 | reg_value |= bits; | |
137 | else | |
138 | reg_value &= ~bits; | |
139 | ||
140 | writel(reg_value, phy->pmu); | |
141 | } | |
142 | ||
143 | static int sun4i_usb_phy_init(struct phy *_phy) | |
144 | { | |
145 | struct sun4i_usb_phy *phy = phy_get_drvdata(_phy); | |
146 | struct sun4i_usb_phy_data *data = to_sun4i_usb_phy_data(phy); | |
147 | int ret; | |
148 | ||
149 | ret = clk_prepare_enable(data->clk); | |
150 | if (ret) | |
151 | return ret; | |
152 | ||
153 | ret = reset_control_deassert(phy->reset); | |
154 | if (ret) { | |
155 | clk_disable_unprepare(data->clk); | |
156 | return ret; | |
157 | } | |
158 | ||
159 | /* Adjust PHY's magnitude and rate */ | |
160 | sun4i_usb_phy_write(phy, PHY_TX_AMPLITUDE_TUNE, 0x14, 5); | |
161 | ||
162 | /* Disconnect threshold adjustment */ | |
163 | sun4i_usb_phy_write(phy, PHY_DISCON_TH_SEL, data->disc_thresh, 2); | |
164 | ||
165 | sun4i_usb_phy_passby(phy, 1); | |
166 | ||
167 | return 0; | |
168 | } | |
169 | ||
170 | static int sun4i_usb_phy_exit(struct phy *_phy) | |
171 | { | |
172 | struct sun4i_usb_phy *phy = phy_get_drvdata(_phy); | |
173 | struct sun4i_usb_phy_data *data = to_sun4i_usb_phy_data(phy); | |
174 | ||
175 | sun4i_usb_phy_passby(phy, 0); | |
176 | reset_control_assert(phy->reset); | |
177 | clk_disable_unprepare(data->clk); | |
178 | ||
179 | return 0; | |
180 | } | |
181 | ||
182 | static int sun4i_usb_phy_power_on(struct phy *_phy) | |
183 | { | |
184 | struct sun4i_usb_phy *phy = phy_get_drvdata(_phy); | |
185 | int ret = 0; | |
186 | ||
187 | if (phy->vbus) | |
188 | ret = regulator_enable(phy->vbus); | |
189 | ||
190 | return ret; | |
191 | } | |
192 | ||
193 | static int sun4i_usb_phy_power_off(struct phy *_phy) | |
194 | { | |
195 | struct sun4i_usb_phy *phy = phy_get_drvdata(_phy); | |
196 | ||
197 | if (phy->vbus) | |
198 | regulator_disable(phy->vbus); | |
199 | ||
200 | return 0; | |
201 | } | |
202 | ||
203 | static struct phy_ops sun4i_usb_phy_ops = { | |
204 | .init = sun4i_usb_phy_init, | |
205 | .exit = sun4i_usb_phy_exit, | |
206 | .power_on = sun4i_usb_phy_power_on, | |
207 | .power_off = sun4i_usb_phy_power_off, | |
208 | .owner = THIS_MODULE, | |
209 | }; | |
210 | ||
211 | static struct phy *sun4i_usb_phy_xlate(struct device *dev, | |
212 | struct of_phandle_args *args) | |
213 | { | |
214 | struct sun4i_usb_phy_data *data = dev_get_drvdata(dev); | |
215 | ||
216 | if (WARN_ON(args->args[0] == 0 || args->args[0] >= data->num_phys)) | |
217 | return ERR_PTR(-ENODEV); | |
218 | ||
219 | return data->phys[args->args[0]].phy; | |
220 | } | |
221 | ||
222 | static int sun4i_usb_phy_probe(struct platform_device *pdev) | |
223 | { | |
224 | struct sun4i_usb_phy_data *data; | |
225 | struct device *dev = &pdev->dev; | |
226 | struct device_node *np = dev->of_node; | |
227 | void __iomem *pmu = NULL; | |
228 | struct phy_provider *phy_provider; | |
229 | struct reset_control *reset; | |
230 | struct regulator *vbus; | |
231 | struct resource *res; | |
232 | struct phy *phy; | |
233 | char name[16]; | |
234 | int i; | |
235 | ||
236 | data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); | |
237 | if (!data) | |
238 | return -ENOMEM; | |
239 | ||
240 | mutex_init(&data->mutex); | |
241 | ||
242 | if (of_device_is_compatible(np, "allwinner,sun5i-a13-usb-phy")) | |
243 | data->num_phys = 2; | |
244 | else | |
245 | data->num_phys = 3; | |
246 | ||
247 | if (of_device_is_compatible(np, "allwinner,sun4i-a10-usb-phy")) | |
248 | data->disc_thresh = 3; | |
249 | else | |
250 | data->disc_thresh = 2; | |
251 | ||
252 | res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy_ctrl"); | |
253 | data->base = devm_ioremap_resource(dev, res); | |
254 | if (IS_ERR(data->base)) | |
255 | return PTR_ERR(data->base); | |
256 | ||
257 | data->clk = devm_clk_get(dev, "usb_phy"); | |
258 | if (IS_ERR(data->clk)) { | |
259 | dev_err(dev, "could not get usb_phy clock\n"); | |
260 | return PTR_ERR(data->clk); | |
261 | } | |
262 | ||
263 | /* Skip 0, 0 is the phy for otg which is not yet supported. */ | |
264 | for (i = 1; i < data->num_phys; i++) { | |
265 | snprintf(name, sizeof(name), "usb%d_vbus", i); | |
266 | vbus = devm_regulator_get_optional(dev, name); | |
267 | if (IS_ERR(vbus)) { | |
268 | if (PTR_ERR(vbus) == -EPROBE_DEFER) | |
269 | return -EPROBE_DEFER; | |
270 | vbus = NULL; | |
271 | } | |
272 | ||
273 | snprintf(name, sizeof(name), "usb%d_reset", i); | |
274 | reset = devm_reset_control_get(dev, name); | |
275 | if (IS_ERR(reset)) { | |
276 | dev_err(dev, "failed to get reset %s\n", name); | |
277 | return PTR_ERR(reset); | |
278 | } | |
279 | ||
280 | if (i) { /* No pmu for usbc0 */ | |
281 | snprintf(name, sizeof(name), "pmu%d", i); | |
282 | res = platform_get_resource_byname(pdev, | |
283 | IORESOURCE_MEM, name); | |
284 | pmu = devm_ioremap_resource(dev, res); | |
285 | if (IS_ERR(pmu)) | |
286 | return PTR_ERR(pmu); | |
287 | } | |
288 | ||
289 | phy = devm_phy_create(dev, &sun4i_usb_phy_ops, NULL); | |
290 | if (IS_ERR(phy)) { | |
291 | dev_err(dev, "failed to create PHY %d\n", i); | |
292 | return PTR_ERR(phy); | |
293 | } | |
294 | ||
295 | data->phys[i].phy = phy; | |
296 | data->phys[i].pmu = pmu; | |
297 | data->phys[i].vbus = vbus; | |
298 | data->phys[i].reset = reset; | |
299 | data->phys[i].index = i; | |
300 | phy_set_drvdata(phy, &data->phys[i]); | |
301 | } | |
302 | ||
303 | dev_set_drvdata(dev, data); | |
304 | phy_provider = devm_of_phy_provider_register(dev, sun4i_usb_phy_xlate); | |
305 | if (IS_ERR(phy_provider)) | |
306 | return PTR_ERR(phy_provider); | |
307 | ||
308 | return 0; | |
309 | } | |
310 | ||
311 | static const struct of_device_id sun4i_usb_phy_of_match[] = { | |
312 | { .compatible = "allwinner,sun4i-a10-usb-phy" }, | |
313 | { .compatible = "allwinner,sun5i-a13-usb-phy" }, | |
314 | { .compatible = "allwinner,sun7i-a20-usb-phy" }, | |
315 | { }, | |
316 | }; | |
317 | MODULE_DEVICE_TABLE(of, sun4i_usb_phy_of_match); | |
318 | ||
319 | static struct platform_driver sun4i_usb_phy_driver = { | |
320 | .probe = sun4i_usb_phy_probe, | |
321 | .driver = { | |
322 | .of_match_table = sun4i_usb_phy_of_match, | |
323 | .name = "sun4i-usb-phy", | |
324 | .owner = THIS_MODULE, | |
325 | } | |
326 | }; | |
327 | module_platform_driver(sun4i_usb_phy_driver); | |
328 | ||
329 | MODULE_DESCRIPTION("Allwinner sun4i USB phy driver"); | |
330 | MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>"); | |
331 | MODULE_LICENSE("GPL v2"); |