tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Samsung SoC USB 1.1/2.0 PHY driver - Exynos 4x12 support
3 *
4 * Copyright (C) 2013 Samsung Electronics Co., Ltd.
5 * Author: Kamil Debski <k.debski@samsung.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12#include <linux/delay.h>
13#include <linux/io.h>
14#include <linux/phy/phy.h>
15#include <linux/regmap.h>
16#include "phy-samsung-usb2.h"
17
18/* Exynos USB PHY registers */
19
20/* PHY power control */
21#define EXYNOS_4x12_UPHYPWR 0x0
22
23#define EXYNOS_4x12_UPHYPWR_PHY0_SUSPEND BIT(0)
24#define EXYNOS_4x12_UPHYPWR_PHY0_PWR BIT(3)
25#define EXYNOS_4x12_UPHYPWR_PHY0_OTG_PWR BIT(4)
26#define EXYNOS_4x12_UPHYPWR_PHY0_SLEEP BIT(5)
27#define EXYNOS_4x12_UPHYPWR_PHY0 ( \
28 EXYNOS_4x12_UPHYPWR_PHY0_SUSPEND | \
29 EXYNOS_4x12_UPHYPWR_PHY0_PWR | \
30 EXYNOS_4x12_UPHYPWR_PHY0_OTG_PWR | \
31 EXYNOS_4x12_UPHYPWR_PHY0_SLEEP)
32
33#define EXYNOS_4x12_UPHYPWR_PHY1_SUSPEND BIT(6)
34#define EXYNOS_4x12_UPHYPWR_PHY1_PWR BIT(7)
35#define EXYNOS_4x12_UPHYPWR_PHY1_SLEEP BIT(8)
36#define EXYNOS_4x12_UPHYPWR_PHY1 ( \
37 EXYNOS_4x12_UPHYPWR_PHY1_SUSPEND | \
38 EXYNOS_4x12_UPHYPWR_PHY1_PWR | \
39 EXYNOS_4x12_UPHYPWR_PHY1_SLEEP)
40
41#define EXYNOS_4x12_UPHYPWR_HSIC0_SUSPEND BIT(9)
42#define EXYNOS_4x12_UPHYPWR_HSIC0_PWR BIT(10)
43#define EXYNOS_4x12_UPHYPWR_HSIC0_SLEEP BIT(11)
44#define EXYNOS_4x12_UPHYPWR_HSIC0 ( \
45 EXYNOS_4x12_UPHYPWR_HSIC0_SUSPEND | \
46 EXYNOS_4x12_UPHYPWR_HSIC0_PWR | \
47 EXYNOS_4x12_UPHYPWR_HSIC0_SLEEP)
48
49#define EXYNOS_4x12_UPHYPWR_HSIC1_SUSPEND BIT(12)
50#define EXYNOS_4x12_UPHYPWR_HSIC1_PWR BIT(13)
51#define EXYNOS_4x12_UPHYPWR_HSIC1_SLEEP BIT(14)
52#define EXYNOS_4x12_UPHYPWR_HSIC1 ( \
53 EXYNOS_4x12_UPHYPWR_HSIC1_SUSPEND | \
54 EXYNOS_4x12_UPHYPWR_HSIC1_PWR | \
55 EXYNOS_4x12_UPHYPWR_HSIC1_SLEEP)
56
57/* PHY clock control */
58#define EXYNOS_4x12_UPHYCLK 0x4
59
60#define EXYNOS_4x12_UPHYCLK_PHYFSEL_MASK (0x7 << 0)
61#define EXYNOS_4x12_UPHYCLK_PHYFSEL_OFFSET 0
62#define EXYNOS_4x12_UPHYCLK_PHYFSEL_9MHZ6 (0x0 << 0)
63#define EXYNOS_4x12_UPHYCLK_PHYFSEL_10MHZ (0x1 << 0)
64#define EXYNOS_4x12_UPHYCLK_PHYFSEL_12MHZ (0x2 << 0)
65#define EXYNOS_4x12_UPHYCLK_PHYFSEL_19MHZ2 (0x3 << 0)
66#define EXYNOS_4x12_UPHYCLK_PHYFSEL_20MHZ (0x4 << 0)
67#define EXYNOS_4x12_UPHYCLK_PHYFSEL_24MHZ (0x5 << 0)
68#define EXYNOS_4x12_UPHYCLK_PHYFSEL_50MHZ (0x7 << 0)
69
70#define EXYNOS_4x12_UPHYCLK_PHY0_ID_PULLUP BIT(3)
71#define EXYNOS_4x12_UPHYCLK_PHY0_COMMON_ON BIT(4)
72#define EXYNOS_4x12_UPHYCLK_PHY1_COMMON_ON BIT(7)
73
74#define EXYNOS_4x12_UPHYCLK_HSIC_REFCLK_MASK (0x7f << 10)
75#define EXYNOS_4x12_UPHYCLK_HSIC_REFCLK_OFFSET 10
76#define EXYNOS_4x12_UPHYCLK_HSIC_REFCLK_12MHZ (0x24 << 10)
77#define EXYNOS_4x12_UPHYCLK_HSIC_REFCLK_15MHZ (0x1c << 10)
78#define EXYNOS_4x12_UPHYCLK_HSIC_REFCLK_16MHZ (0x1a << 10)
79#define EXYNOS_4x12_UPHYCLK_HSIC_REFCLK_19MHZ2 (0x15 << 10)
80#define EXYNOS_4x12_UPHYCLK_HSIC_REFCLK_20MHZ (0x14 << 10)
81
82/* PHY reset control */
83#define EXYNOS_4x12_UPHYRST 0x8
84
85#define EXYNOS_4x12_URSTCON_PHY0 BIT(0)
86#define EXYNOS_4x12_URSTCON_OTG_HLINK BIT(1)
87#define EXYNOS_4x12_URSTCON_OTG_PHYLINK BIT(2)
88#define EXYNOS_4x12_URSTCON_HOST_PHY BIT(3)
89#define EXYNOS_4x12_URSTCON_PHY1 BIT(4)
90#define EXYNOS_4x12_URSTCON_HSIC0 BIT(5)
91#define EXYNOS_4x12_URSTCON_HSIC1 BIT(6)
92#define EXYNOS_4x12_URSTCON_HOST_LINK_ALL BIT(7)
93#define EXYNOS_4x12_URSTCON_HOST_LINK_P0 BIT(8)
94#define EXYNOS_4x12_URSTCON_HOST_LINK_P1 BIT(9)
95#define EXYNOS_4x12_URSTCON_HOST_LINK_P2 BIT(10)
96
97/* Isolation, configured in the power management unit */
98#define EXYNOS_4x12_USB_ISOL_OFFSET 0x704
99#define EXYNOS_4x12_USB_ISOL_OTG BIT(0)
100#define EXYNOS_4x12_USB_ISOL_HSIC0_OFFSET 0x708
101#define EXYNOS_4x12_USB_ISOL_HSIC0 BIT(0)
102#define EXYNOS_4x12_USB_ISOL_HSIC1_OFFSET 0x70c
103#define EXYNOS_4x12_USB_ISOL_HSIC1 BIT(0)
104
105/* Mode switching SUB Device <-> Host */
106#define EXYNOS_4x12_MODE_SWITCH_OFFSET 0x21c
107#define EXYNOS_4x12_MODE_SWITCH_MASK 1
108#define EXYNOS_4x12_MODE_SWITCH_DEVICE 0
109#define EXYNOS_4x12_MODE_SWITCH_HOST 1
110
111enum exynos4x12_phy_id {
112 EXYNOS4x12_DEVICE,
113 EXYNOS4x12_HOST,
114 EXYNOS4x12_HSIC0,
115 EXYNOS4x12_HSIC1,
116 EXYNOS4x12_NUM_PHYS,
117};
118
119/*
120 * exynos4x12_rate_to_clk() converts the supplied clock rate to the value that
121 * can be written to the phy register.
122 */
123static int exynos4x12_rate_to_clk(unsigned long rate, u32 *reg)
124{
125 /* EXYNOS_4x12_UPHYCLK_PHYFSEL_MASK */
126
127 switch (rate) {
128 case 9600 * KHZ:
129 *reg = EXYNOS_4x12_UPHYCLK_PHYFSEL_9MHZ6;
130 break;
131 case 10 * MHZ:
132 *reg = EXYNOS_4x12_UPHYCLK_PHYFSEL_10MHZ;
133 break;
134 case 12 * MHZ:
135 *reg = EXYNOS_4x12_UPHYCLK_PHYFSEL_12MHZ;
136 break;
137 case 19200 * KHZ:
138 *reg = EXYNOS_4x12_UPHYCLK_PHYFSEL_19MHZ2;
139 break;
140 case 20 * MHZ:
141 *reg = EXYNOS_4x12_UPHYCLK_PHYFSEL_20MHZ;
142 break;
143 case 24 * MHZ:
144 *reg = EXYNOS_4x12_UPHYCLK_PHYFSEL_24MHZ;
145 break;
146 case 50 * MHZ:
147 *reg = EXYNOS_4x12_UPHYCLK_PHYFSEL_50MHZ;
148 break;
149 default:
150 return -EINVAL;
151 }
152
153 return 0;
154}
155
156static void exynos4x12_isol(struct samsung_usb2_phy_instance *inst, bool on)
157{
158 struct samsung_usb2_phy_driver *drv = inst->drv;
159 u32 offset;
160 u32 mask;
161
162 switch (inst->cfg->id) {
163 case EXYNOS4x12_DEVICE:
164 case EXYNOS4x12_HOST:
165 offset = EXYNOS_4x12_USB_ISOL_OFFSET;
166 mask = EXYNOS_4x12_USB_ISOL_OTG;
167 break;
168 case EXYNOS4x12_HSIC0:
169 offset = EXYNOS_4x12_USB_ISOL_HSIC0_OFFSET;
170 mask = EXYNOS_4x12_USB_ISOL_HSIC0;
171 break;
172 case EXYNOS4x12_HSIC1:
173 offset = EXYNOS_4x12_USB_ISOL_HSIC1_OFFSET;
174 mask = EXYNOS_4x12_USB_ISOL_HSIC1;
175 break;
176 default:
177 return;
178 };
179
180 regmap_update_bits(drv->reg_pmu, offset, mask, on ? 0 : mask);
181}
182
183static void exynos4x12_setup_clk(struct samsung_usb2_phy_instance *inst)
184{
185 struct samsung_usb2_phy_driver *drv = inst->drv;
186 u32 clk;
187
188 clk = readl(drv->reg_phy + EXYNOS_4x12_UPHYCLK);
189 clk &= ~EXYNOS_4x12_UPHYCLK_PHYFSEL_MASK;
190 clk |= drv->ref_reg_val << EXYNOS_4x12_UPHYCLK_PHYFSEL_OFFSET;
191 writel(clk, drv->reg_phy + EXYNOS_4x12_UPHYCLK);
192}
193
194static void exynos4x12_phy_pwr(struct samsung_usb2_phy_instance *inst, bool on)
195{
196 struct samsung_usb2_phy_driver *drv = inst->drv;
197 u32 rstbits = 0;
198 u32 phypwr = 0;
199 u32 rst;
200 u32 pwr;
201 u32 mode = 0;
202 u32 switch_mode = 0;
203
204 switch (inst->cfg->id) {
205 case EXYNOS4x12_DEVICE:
206 phypwr = EXYNOS_4x12_UPHYPWR_PHY0;
207 rstbits = EXYNOS_4x12_URSTCON_PHY0;
208 mode = EXYNOS_4x12_MODE_SWITCH_DEVICE;
209 switch_mode = 1;
210 break;
211 case EXYNOS4x12_HOST:
212 phypwr = EXYNOS_4x12_UPHYPWR_PHY1;
213 rstbits = EXYNOS_4x12_URSTCON_HOST_PHY;
214 mode = EXYNOS_4x12_MODE_SWITCH_HOST;
215 switch_mode = 1;
216 break;
217 case EXYNOS4x12_HSIC0:
218 phypwr = EXYNOS_4x12_UPHYPWR_HSIC0;
219 rstbits = EXYNOS_4x12_URSTCON_HSIC1 |
220 EXYNOS_4x12_URSTCON_HOST_LINK_P0 |
221 EXYNOS_4x12_URSTCON_HOST_PHY;
222 break;
223 case EXYNOS4x12_HSIC1:
224 phypwr = EXYNOS_4x12_UPHYPWR_HSIC1;
225 rstbits = EXYNOS_4x12_URSTCON_HSIC1 |
226 EXYNOS_4x12_URSTCON_HOST_LINK_P1;
227 break;
228 };
229
230 if (on) {
231 if (switch_mode)
232 regmap_update_bits(drv->reg_sys,
233 EXYNOS_4x12_MODE_SWITCH_OFFSET,
234 EXYNOS_4x12_MODE_SWITCH_MASK, mode);
235
236 pwr = readl(drv->reg_phy + EXYNOS_4x12_UPHYPWR);
237 pwr &= ~phypwr;
238 writel(pwr, drv->reg_phy + EXYNOS_4x12_UPHYPWR);
239
240 rst = readl(drv->reg_phy + EXYNOS_4x12_UPHYRST);
241 rst |= rstbits;
242 writel(rst, drv->reg_phy + EXYNOS_4x12_UPHYRST);
243 udelay(10);
244 rst &= ~rstbits;
245 writel(rst, drv->reg_phy + EXYNOS_4x12_UPHYRST);
246 /* The following delay is necessary for the reset sequence to be
247 * completed */
248 udelay(80);
249 } else {
250 pwr = readl(drv->reg_phy + EXYNOS_4x12_UPHYPWR);
251 pwr |= phypwr;
252 writel(pwr, drv->reg_phy + EXYNOS_4x12_UPHYPWR);
253 }
254}
255
256static int exynos4x12_power_on(struct samsung_usb2_phy_instance *inst)
257{
258 struct samsung_usb2_phy_driver *drv = inst->drv;
259
260 inst->enabled = 1;
261 exynos4x12_setup_clk(inst);
262 exynos4x12_phy_pwr(inst, 1);
263 exynos4x12_isol(inst, 0);
264
265 /* Power on the device, as it is necessary for HSIC to work */
266 if (inst->cfg->id == EXYNOS4x12_HSIC0) {
267 struct samsung_usb2_phy_instance *device =
268 &drv->instances[EXYNOS4x12_DEVICE];
269 exynos4x12_phy_pwr(device, 1);
270 exynos4x12_isol(device, 0);
271 }
272
273 return 0;
274}
275
276static int exynos4x12_power_off(struct samsung_usb2_phy_instance *inst)
277{
278 struct samsung_usb2_phy_driver *drv = inst->drv;
279 struct samsung_usb2_phy_instance *device =
280 &drv->instances[EXYNOS4x12_DEVICE];
281
282 inst->enabled = 0;
283 exynos4x12_isol(inst, 1);
284 exynos4x12_phy_pwr(inst, 0);
285
286 if (inst->cfg->id == EXYNOS4x12_HSIC0 && !device->enabled) {
287 exynos4x12_isol(device, 1);
288 exynos4x12_phy_pwr(device, 0);
289 }
290
291 return 0;
292}
293
294
295static const struct samsung_usb2_common_phy exynos4x12_phys[] = {
296 {
297 .label = "device",
298 .id = EXYNOS4x12_DEVICE,
299 .power_on = exynos4x12_power_on,
300 .power_off = exynos4x12_power_off,
301 },
302 {
303 .label = "host",
304 .id = EXYNOS4x12_HOST,
305 .power_on = exynos4x12_power_on,
306 .power_off = exynos4x12_power_off,
307 },
308 {
309 .label = "hsic0",
310 .id = EXYNOS4x12_HSIC0,
311 .power_on = exynos4x12_power_on,
312 .power_off = exynos4x12_power_off,
313 },
314 {
315 .label = "hsic1",
316 .id = EXYNOS4x12_HSIC1,
317 .power_on = exynos4x12_power_on,
318 .power_off = exynos4x12_power_off,
319 },
320 {},
321};
322
323const struct samsung_usb2_phy_config exynos4x12_usb2_phy_config = {
324 .has_mode_switch = 1,
325 .num_phys = EXYNOS4x12_NUM_PHYS,
326 .phys = exynos4x12_phys,
327 .rate_to_clk = exynos4x12_rate_to_clk,
328};