summaryrefslogtreecommitdiffstats
path: root/drivers/phy/samsung/phy-exynos5250-usb2.c
blob: aad806272305f068dd8fa06ee079eeb45cc6ade5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
/*
 * Samsung SoC USB 1.1/2.0 PHY driver - Exynos 5250 support
 *
 * Copyright (C) 2013 Samsung Electronics Co., Ltd.
 * Author: Kamil Debski <k.debski@samsung.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/delay.h>
#include <linux/io.h>
#include <linux/phy/phy.h>
#include <linux/regmap.h>
#include "phy-samsung-usb2.h"

/* Exynos USB PHY registers */
#define EXYNOS_5250_REFCLKSEL_CRYSTAL	0x0
#define EXYNOS_5250_REFCLKSEL_XO	0x1
#define EXYNOS_5250_REFCLKSEL_CLKCORE	0x2

#define EXYNOS_5250_FSEL_9MHZ6		0x0
#define EXYNOS_5250_FSEL_10MHZ		0x1
#define EXYNOS_5250_FSEL_12MHZ		0x2
#define EXYNOS_5250_FSEL_19MHZ2		0x3
#define EXYNOS_5250_FSEL_20MHZ		0x4
#define EXYNOS_5250_FSEL_24MHZ		0x5
#define EXYNOS_5250_FSEL_50MHZ		0x7

/* Normal host */
#define EXYNOS_5250_HOSTPHYCTRL0			0x0

#define EXYNOS_5250_HOSTPHYCTRL0_PHYSWRSTALL		BIT(31)
#define EXYNOS_5250_HOSTPHYCTRL0_REFCLKSEL_SHIFT	19
#define EXYNOS_5250_HOSTPHYCTRL0_REFCLKSEL_MASK	\
		(0x3 << EXYNOS_5250_HOSTPHYCTRL0_REFCLKSEL_SHIFT)
#define EXYNOS_5250_HOSTPHYCTRL0_FSEL_SHIFT		16
#define EXYNOS_5250_HOSTPHYCTRL0_FSEL_MASK \
		(0x7 << EXYNOS_5250_HOSTPHYCTRL0_FSEL_SHIFT)
#define EXYNOS_5250_HOSTPHYCTRL0_TESTBURNIN		BIT(11)
#define EXYNOS_5250_HOSTPHYCTRL0_RETENABLE		BIT(10)
#define EXYNOS_5250_HOSTPHYCTRL0_COMMON_ON_N		BIT(9)
#define EXYNOS_5250_HOSTPHYCTRL0_VATESTENB_MASK		(0x3 << 7)
#define EXYNOS_5250_HOSTPHYCTRL0_VATESTENB_DUAL		(0x0 << 7)
#define EXYNOS_5250_HOSTPHYCTRL0_VATESTENB_ID0		(0x1 << 7)
#define EXYNOS_5250_HOSTPHYCTRL0_VATESTENB_ANALOGTEST	(0x2 << 7)
#define EXYNOS_5250_HOSTPHYCTRL0_SIDDQ			BIT(6)
#define EXYNOS_5250_HOSTPHYCTRL0_FORCESLEEP		BIT(5)
#define EXYNOS_5250_HOSTPHYCTRL0_FORCESUSPEND		BIT(4)
#define EXYNOS_5250_HOSTPHYCTRL0_WORDINTERFACE		BIT(3)
#define EXYNOS_5250_HOSTPHYCTRL0_UTMISWRST		BIT(2)
#define EXYNOS_5250_HOSTPHYCTRL0_LINKSWRST		BIT(1)
#define EXYNOS_5250_HOSTPHYCTRL0_PHYSWRST		BIT(0)

/* HSIC0 & HSIC1 */
#define EXYNOS_5250_HSICPHYCTRL1			0x10
#define EXYNOS_5250_HSICPHYCTRL2			0x20

#define EXYNOS_5250_HSICPHYCTRLX_REFCLKSEL_MASK		(0x3 << 23)
#define EXYNOS_5250_HSICPHYCTRLX_REFCLKSEL_DEFAULT	(0x2 << 23)
#define EXYNOS_5250_HSICPHYCTRLX_REFCLKDIV_MASK		(0x7f << 16)
#define EXYNOS_5250_HSICPHYCTRLX_REFCLKDIV_12		(0x24 << 16)
#define EXYNOS_5250_HSICPHYCTRLX_REFCLKDIV_15		(0x1c << 16)
#define EXYNOS_5250_HSICPHYCTRLX_REFCLKDIV_16		(0x1a << 16)
#define EXYNOS_5250_HSICPHYCTRLX_REFCLKDIV_19_2		(0x15 << 16)
#define EXYNOS_5250_HSICPHYCTRLX_REFCLKDIV_20		(0x14 << 16)
#define EXYNOS_5250_HSICPHYCTRLX_SIDDQ			BIT(6)
#define EXYNOS_5250_HSICPHYCTRLX_FORCESLEEP		BIT(5)
#define EXYNOS_5250_HSICPHYCTRLX_FORCESUSPEND		BIT(4)
#define EXYNOS_5250_HSICPHYCTRLX_WORDINTERFACE		BIT(3)
#define EXYNOS_5250_HSICPHYCTRLX_UTMISWRST		BIT(2)
#define EXYNOS_5250_HSICPHYCTRLX_PHYSWRST		BIT(0)

/* EHCI control */
#define EXYNOS_5250_HOSTEHCICTRL			0x30
#define EXYNOS_5250_HOSTEHCICTRL_ENAINCRXALIGN		BIT(29)
#define EXYNOS_5250_HOSTEHCICTRL_ENAINCR4		BIT(28)
#define EXYNOS_5250_HOSTEHCICTRL_ENAINCR8		BIT(27)
#define EXYNOS_5250_HOSTEHCICTRL_ENAINCR16		BIT(26)
#define EXYNOS_5250_HOSTEHCICTRL_AUTOPPDONOVRCUREN	BIT(25)
#define EXYNOS_5250_HOSTEHCICTRL_FLADJVAL0_SHIFT	19
#define EXYNOS_5250_HOSTEHCICTRL_FLADJVAL0_MASK	\
		(0x3f << EXYNOS_5250_HOSTEHCICTRL_FLADJVAL0_SHIFT)
#define EXYNOS_5250_HOSTEHCICTRL_FLADJVAL1_SHIFT	13
#define EXYNOS_5250_HOSTEHCICTRL_FLADJVAL1_MASK	\
		(0x3f << EXYNOS_5250_HOSTEHCICTRL_FLADJVAL1_SHIFT)
#define EXYNOS_5250_HOSTEHCICTRL_FLADJVAL2_SHIFT	7
#define EXYNOS_5250_HOSTEHCICTRL_FLADJVAL0_MASK	\
		(0x3f << EXYNOS_5250_HOSTEHCICTRL_FLADJVAL0_SHIFT)
#define EXYNOS_5250_HOSTEHCICTRL_FLADJVALHOST_SHIFT	1
#define EXYNOS_5250_HOSTEHCICTRL_FLADJVALHOST_MASK \
		(0x1 << EXYNOS_5250_HOSTEHCICTRL_FLADJVALHOST_SHIFT)
#define EXYNOS_5250_HOSTEHCICTRL_SIMULATIONMODE		BIT(0)

/* OHCI control */
#define EXYNOS_5250_HOSTOHCICTRL                        0x34
#define EXYNOS_5250_HOSTOHCICTRL_FRAMELENVAL_SHIFT	1
#define EXYNOS_5250_HOSTOHCICTRL_FRAMELENVAL_MASK \
		(0x3ff << EXYNOS_5250_HOSTOHCICTRL_FRAMELENVAL_SHIFT)
#define EXYNOS_5250_HOSTOHCICTRL_FRAMELENVALEN		BIT(0)

/* USBOTG */
#define EXYNOS_5250_USBOTGSYS				0x38
#define EXYNOS_5250_USBOTGSYS_PHYLINK_SW_RESET		BIT(14)
#define EXYNOS_5250_USBOTGSYS_LINK_SW_RST_UOTG		BIT(13)
#define EXYNOS_5250_USBOTGSYS_PHY_SW_RST		BIT(12)
#define EXYNOS_5250_USBOTGSYS_REFCLKSEL_SHIFT		9
#define EXYNOS_5250_USBOTGSYS_REFCLKSEL_MASK \
		(0x3 << EXYNOS_5250_USBOTGSYS_REFCLKSEL_SHIFT)
#define EXYNOS_5250_USBOTGSYS_ID_PULLUP			BIT(8)
#define EXYNOS_5250_USBOTGSYS_COMMON_ON			BIT(7)
#define EXYNOS_5250_USBOTGSYS_FSEL_SHIFT		4
#define EXYNOS_5250_USBOTGSYS_FSEL_MASK \
		(0x3 << EXYNOS_5250_USBOTGSYS_FSEL_SHIFT)
#define EXYNOS_5250_USBOTGSYS_FORCE_SLEEP		BIT(3)
#define EXYNOS_5250_USBOTGSYS_OTGDISABLE		BIT(2)
#define EXYNOS_5250_USBOTGSYS_SIDDQ_UOTG		BIT(1)
#define EXYNOS_5250_USBOTGSYS_FORCE_SUSPEND		BIT(0)

/* Isolation, configured in the power management unit */
#define EXYNOS_5250_USB_ISOL_OTG_OFFSET		0x704
#define EXYNOS_5250_USB_ISOL_OTG		BIT(0)
#define EXYNOS_5250_USB_ISOL_HOST_OFFSET	0x708
#define EXYNOS_5250_USB_ISOL_HOST		BIT(0)

/* Mode swtich register */
#define EXYNOS_5250_MODE_SWITCH_OFFSET		0x230
#define EXYNOS_5250_MODE_SWITCH_MASK		1
#define EXYNOS_5250_MODE_SWITCH_DEVICE		0
#define EXYNOS_5250_MODE_SWITCH_HOST		1

enum exynos4x12_phy_id {
	EXYNOS5250_DEVICE,
	EXYNOS5250_HOST,
	EXYNOS5250_HSIC0,
	EXYNOS5250_HSIC1,
	EXYNOS5250_NUM_PHYS,
};

/*
 * exynos5250_rate_to_clk() converts the supplied clock rate to the value that
 * can be written to the phy register.
 */
static int exynos5250_rate_to_clk(unsigned long rate, u32 *reg)
{
	/* EXYNOS_5250_FSEL_MASK */

	switch (rate) {
	case 9600 * KHZ:
		*reg = EXYNOS_5250_FSEL_9MHZ6;
		break;
	case 10 * MHZ:
		*reg = EXYNOS_5250_FSEL_10MHZ;
		break;
	case 12 * MHZ:
		*reg = EXYNOS_5250_FSEL_12MHZ;
		break;
	case 19200 * KHZ:
		*reg = EXYNOS_5250_FSEL_19MHZ2;
		break;
	case 20 * MHZ:
		*reg = EXYNOS_5250_FSEL_20MHZ;
		break;
	case 24 * MHZ:
		*reg = EXYNOS_5250_FSEL_24MHZ;
		break;
	case 50 * MHZ:
		*reg = EXYNOS_5250_FSEL_50MHZ;
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static void exynos5250_isol(struct samsung_usb2_phy_instance *inst, bool on)
{
	struct samsung_usb2_phy_driver *drv = inst->drv;
	u32 offset;
	u32 mask;

	switch (inst->cfg->id) {
	case EXYNOS5250_DEVICE:
		offset = EXYNOS_5250_USB_ISOL_OTG_OFFSET;
		mask = EXYNOS_5250_USB_ISOL_OTG;
		break;
	case EXYNOS5250_HOST:
		offset = EXYNOS_5250_USB_ISOL_HOST_OFFSET;
		mask = EXYNOS_5250_USB_ISOL_HOST;
		break;
	default:
		return;
	}

	regmap_update_bits(drv->reg_pmu, offset, mask, on ? 0 : mask);
}

static int exynos5250_power_on(struct samsung_usb2_phy_instance *inst)
{
	struct samsung_usb2_phy_driver *drv = inst->drv;
	u32 ctrl0;
	u32 otg;
	u32 ehci;
	u32 ohci;
	u32 hsic;

	switch (inst->cfg->id) {
	case EXYNOS5250_DEVICE:
		regmap_update_bits(drv->reg_sys,
				   EXYNOS_5250_MODE_SWITCH_OFFSET,
				   EXYNOS_5250_MODE_SWITCH_MASK,
				   EXYNOS_5250_MODE_SWITCH_DEVICE);

		/* OTG configuration */
		otg = readl(drv->reg_phy + EXYNOS_5250_USBOTGSYS);
		/* The clock */
		otg &= ~EXYNOS_5250_USBOTGSYS_FSEL_MASK;
		otg |= drv->ref_reg_val << EXYNOS_5250_USBOTGSYS_FSEL_SHIFT;
		/* Reset */
		otg &= ~(EXYNOS_5250_USBOTGSYS_FORCE_SUSPEND |
			EXYNOS_5250_USBOTGSYS_FORCE_SLEEP |
			EXYNOS_5250_USBOTGSYS_SIDDQ_UOTG);
		otg |=	EXYNOS_5250_USBOTGSYS_PHY_SW_RST |
			EXYNOS_5250_USBOTGSYS_PHYLINK_SW_RESET |
			EXYNOS_5250_USBOTGSYS_LINK_SW_RST_UOTG |
			EXYNOS_5250_USBOTGSYS_OTGDISABLE;
		/* Ref clock */
		otg &=	~EXYNOS_5250_USBOTGSYS_REFCLKSEL_MASK;
		otg |=  EXYNOS_5250_REFCLKSEL_CLKCORE <<
					EXYNOS_5250_USBOTGSYS_REFCLKSEL_SHIFT;
		writel(otg, drv->reg_phy + EXYNOS_5250_USBOTGSYS);
		udelay(100);
		otg &= ~(EXYNOS_5250_USBOTGSYS_PHY_SW_RST |
			EXYNOS_5250_USBOTGSYS_LINK_SW_RST_UOTG |
			EXYNOS_5250_USBOTGSYS_PHYLINK_SW_RESET |
			EXYNOS_5250_USBOTGSYS_OTGDISABLE);
		writel(otg, drv->reg_phy + EXYNOS_5250_USBOTGSYS);


		break;
	case EXYNOS5250_HOST:
	case EXYNOS5250_HSIC0:
	case EXYNOS5250_HSIC1:
		/* Host registers configuration */
		ctrl0 = readl(drv->reg_phy + EXYNOS_5250_HOSTPHYCTRL0);
		/* The clock */
		ctrl0 &= ~EXYNOS_5250_HOSTPHYCTRL0_FSEL_MASK;
		ctrl0 |= drv->ref_reg_val <<
					EXYNOS_5250_HOSTPHYCTRL0_FSEL_SHIFT;

		/* Reset */
		ctrl0 &=	~(EXYNOS_5250_HOSTPHYCTRL0_PHYSWRST |
				EXYNOS_5250_HOSTPHYCTRL0_PHYSWRSTALL |
				EXYNOS_5250_HOSTPHYCTRL0_SIDDQ |
				EXYNOS_5250_HOSTPHYCTRL0_FORCESUSPEND |
				EXYNOS_5250_HOSTPHYCTRL0_FORCESLEEP);
		ctrl0 |=	EXYNOS_5250_HOSTPHYCTRL0_LINKSWRST |
				EXYNOS_5250_HOSTPHYCTRL0_UTMISWRST |
				EXYNOS_5250_HOSTPHYCTRL0_COMMON_ON_N;
		writel(ctrl0, drv->reg_phy + EXYNOS_5250_HOSTPHYCTRL0);
		udelay(10);
		ctrl0 &=	~(EXYNOS_5250_HOSTPHYCTRL0_LINKSWRST |
				EXYNOS_5250_HOSTPHYCTRL0_UTMISWRST);
		writel(ctrl0, drv->reg_phy + EXYNOS_5250_HOSTPHYCTRL0);

		/* OTG configuration */
		otg = readl(drv->reg_phy + EXYNOS_5250_USBOTGSYS);
		/* The clock */
		otg &= ~EXYNOS_5250_USBOTGSYS_FSEL_MASK;
		otg |= drv->ref_reg_val << EXYNOS_5250_USBOTGSYS_FSEL_SHIFT;
		/* Reset */
		otg &= ~(EXYNOS_5250_USBOTGSYS_FORCE_SUSPEND |
			EXYNOS_5250_USBOTGSYS_FORCE_SLEEP |
			EXYNOS_5250_USBOTGSYS_SIDDQ_UOTG);
		otg |=	EXYNOS_5250_USBOTGSYS_PHY_SW_RST |
			EXYNOS_5250_USBOTGSYS_PHYLINK_SW_RESET |
			EXYNOS_5250_USBOTGSYS_LINK_SW_RST_UOTG |
			EXYNOS_5250_USBOTGSYS_OTGDISABLE;
		/* Ref clock */
		otg &=	~EXYNOS_5250_USBOTGSYS_REFCLKSEL_MASK;
		otg |=  EXYNOS_5250_REFCLKSEL_CLKCORE <<
					EXYNOS_5250_USBOTGSYS_REFCLKSEL_SHIFT;
		writel(otg, drv->reg_phy + EXYNOS_5250_USBOTGSYS);
		udelay(10);
		otg &= ~(EXYNOS_5250_USBOTGSYS_PHY_SW_RST |
			EXYNOS_5250_USBOTGSYS_LINK_SW_RST_UOTG |
			EXYNOS_5250_USBOTGSYS_PHYLINK_SW_RESET);

		/* HSIC phy configuration */
		hsic = (EXYNOS_5250_HSICPHYCTRLX_REFCLKDIV_12 |
				EXYNOS_5250_HSICPHYCTRLX_REFCLKSEL_DEFAULT |
				EXYNOS_5250_HSICPHYCTRLX_PHYSWRST);
		writel(hsic, drv->reg_phy + EXYNOS_5250_HSICPHYCTRL1);
		writel(hsic, drv->reg_phy + EXYNOS_5250_HSICPHYCTRL2);
		udelay(10);
		hsic &= ~EXYNOS_5250_HSICPHYCTRLX_PHYSWRST;
		writel(hsic, drv->reg_phy + EXYNOS_5250_HSICPHYCTRL1);
		writel(hsic, drv->reg_phy + EXYNOS_5250_HSICPHYCTRL2);
		/* The following delay is necessary for the reset sequence to be
		 * completed */
		udelay(80);

		/* Enable EHCI DMA burst */
		ehci = readl(drv->reg_phy + EXYNOS_5250_HOSTEHCICTRL);
		ehci |=	EXYNOS_5250_HOSTEHCICTRL_ENAINCRXALIGN |
			EXYNOS_5250_HOSTEHCICTRL_ENAINCR4 |
			EXYNOS_5250_HOSTEHCICTRL_ENAINCR8 |
			EXYNOS_5250_HOSTEHCICTRL_ENAINCR16;
		writel(ehci, drv->reg_phy + EXYNOS_5250_HOSTEHCICTRL);

		/* OHCI settings */
		ohci = readl(drv->reg_phy + EXYNOS_5250_HOSTOHCICTRL);
		/* Following code is based on the old driver */
		ohci |=	0x1 << 3;
		writel(ohci, drv->reg_phy + EXYNOS_5250_HOSTOHCICTRL);

		break;
	}
	exynos5250_isol(inst, 0);

	return 0;
}

static int exynos5250_power_off(struct samsung_usb2_phy_instance *inst)
{
	struct samsung_usb2_phy_driver *drv = inst->drv;
	u32 ctrl0;
	u32 otg;
	u32 hsic;

	exynos5250_isol(inst, 1);

	switch (inst->cfg->id) {
	case EXYNOS5250_DEVICE:
		otg = readl(drv->reg_phy + EXYNOS_5250_USBOTGSYS);
		otg |= (EXYNOS_5250_USBOTGSYS_FORCE_SUSPEND |
			EXYNOS_5250_USBOTGSYS_SIDDQ_UOTG |
			EXYNOS_5250_USBOTGSYS_FORCE_SLEEP);
		writel(otg, drv->reg_phy + EXYNOS_5250_USBOTGSYS);
		break;
	case EXYNOS5250_HOST:
		ctrl0 = readl(drv->reg_phy + EXYNOS_5250_HOSTPHYCTRL0);
		ctrl0 |= (EXYNOS_5250_HOSTPHYCTRL0_SIDDQ |
				EXYNOS_5250_HOSTPHYCTRL0_FORCESUSPEND |
				EXYNOS_5250_HOSTPHYCTRL0_FORCESLEEP |
				EXYNOS_5250_HOSTPHYCTRL0_PHYSWRST |
				EXYNOS_5250_HOSTPHYCTRL0_PHYSWRSTALL);
		writel(ctrl0, drv->reg_phy + EXYNOS_5250_HOSTPHYCTRL0);
		break;
	case EXYNOS5250_HSIC0:
	case EXYNOS5250_HSIC1:
		hsic = (EXYNOS_5250_HSICPHYCTRLX_REFCLKDIV_12 |
				EXYNOS_5250_HSICPHYCTRLX_REFCLKSEL_DEFAULT |
				EXYNOS_5250_HSICPHYCTRLX_SIDDQ |
				EXYNOS_5250_HSICPHYCTRLX_FORCESLEEP |
				EXYNOS_5250_HSICPHYCTRLX_FORCESUSPEND
				);
		writel(hsic, drv->reg_phy + EXYNOS_5250_HSICPHYCTRL1);
		writel(hsic, drv->reg_phy + EXYNOS_5250_HSICPHYCTRL2);
		break;
	}

	return 0;
}


static const struct samsung_usb2_common_phy exynos5250_phys[] = {
	{
		.label		= "device",
		.id		= EXYNOS5250_DEVICE,
		.power_on	= exynos5250_power_on,
		.power_off	= exynos5250_power_off,
	},
	{
		.label		= "host",
		.id		= EXYNOS5250_HOST,
		.power_on	= exynos5250_power_on,
		.power_off	= exynos5250_power_off,
	},
	{
		.label		= "hsic0",
		.id		= EXYNOS5250_HSIC0,
		.power_on	= exynos5250_power_on,
		.power_off	= exynos5250_power_off,
	},
	{
		.label		= "hsic1",
		.id		= EXYNOS5250_HSIC1,
		.power_on	= exynos5250_power_on,
		.power_off	= exynos5250_power_off,
	},
};

const struct samsung_usb2_phy_config exynos5250_usb2_phy_config = {
	.has_mode_switch	= 1,
	.num_phys		= EXYNOS5250_NUM_PHYS,
	.phys			= exynos5250_phys,
	.rate_to_clk		= exynos5250_rate_to_clk,
};