aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-pxa/pxa27x.c
blob: ec68cc16b4e3347631ee427854b99d505e551692 (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
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
/*
 *  linux/arch/arm/mach-pxa/pxa27x.c
 *
 *  Author:	Nicolas Pitre
 *  Created:	Nov 05, 2002
 *  Copyright:	MontaVista Software Inc.
 *
 * Code specific to PXA27x aka Bulverde.
 *
 * 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/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/suspend.h>
#include <linux/platform_device.h>
#include <linux/sysdev.h>

#include <mach/hardware.h>
#include <asm/irq.h>
#include <mach/irqs.h>
#include <mach/gpio.h>
#include <mach/pxa27x.h>
#include <mach/reset.h>
#include <mach/ohci.h>
#include <mach/pm.h>
#include <mach/dma.h>
#include <plat/i2c.h>

#include "generic.h"
#include "devices.h"
#include "clock.h"

void pxa27x_clear_otgph(void)
{
	if (cpu_is_pxa27x() && (PSSR & PSSR_OTGPH))
		PSSR |= PSSR_OTGPH;
}
EXPORT_SYMBOL(pxa27x_clear_otgph);

/* Crystal clock: 13MHz */
#define BASE_CLK	13000000

/*
 * Get the clock frequency as reflected by CCSR and the turbo flag.
 * We assume these values have been applied via a fcs.
 * If info is not 0 we also display the current settings.
 */
unsigned int pxa27x_get_clk_frequency_khz(int info)
{
	unsigned long ccsr, clkcfg;
	unsigned int l, L, m, M, n2, N, S;
       	int cccr_a, t, ht, b;

	ccsr = CCSR;
	cccr_a = CCCR & (1 << 25);

	/* Read clkcfg register: it has turbo, b, half-turbo (and f) */
	asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg) );
	t  = clkcfg & (1 << 0);
	ht = clkcfg & (1 << 2);
	b  = clkcfg & (1 << 3);

	l  = ccsr & 0x1f;
	n2 = (ccsr>>7) & 0xf;
	m  = (l <= 10) ? 1 : (l <= 20) ? 2 : 4;

	L  = l * BASE_CLK;
	N  = (L * n2) / 2;
	M  = (!cccr_a) ? (L/m) : ((b) ? L : (L/2));
	S  = (b) ? L : (L/2);

	if (info) {
		printk( KERN_INFO "Run Mode clock: %d.%02dMHz (*%d)\n",
			L / 1000000, (L % 1000000) / 10000, l );
		printk( KERN_INFO "Turbo Mode clock: %d.%02dMHz (*%d.%d, %sactive)\n",
			N / 1000000, (N % 1000000)/10000, n2 / 2, (n2 % 2)*5,
			(t) ? "" : "in" );
		printk( KERN_INFO "Memory clock: %d.%02dMHz (/%d)\n",
			M / 1000000, (M % 1000000) / 10000, m );
		printk( KERN_INFO "System bus clock: %d.%02dMHz \n",
			S / 1000000, (S % 1000000) / 10000 );
	}

	return (t) ? (N/1000) : (L/1000);
}

/*
 * Return the current mem clock frequency in units of 10kHz as
 * reflected by CCCR[A], B, and L
 */
unsigned int pxa27x_get_memclk_frequency_10khz(void)
{
	unsigned long ccsr, clkcfg;
	unsigned int l, L, m, M;
       	int cccr_a, b;

	ccsr = CCSR;
	cccr_a = CCCR & (1 << 25);

	/* Read clkcfg register: it has turbo, b, half-turbo (and f) */
	asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg) );
	b = clkcfg & (1 << 3);

	l = ccsr & 0x1f;
	m = (l <= 10) ? 1 : (l <= 20) ? 2 : 4;

	L = l * BASE_CLK;
	M = (!cccr_a) ? (L/m) : ((b) ? L : (L/2));

	return (M / 10000);
}

/*
 * Return the current LCD clock frequency in units of 10kHz as
 */
static unsigned int pxa27x_get_lcdclk_frequency_10khz(void)
{
	unsigned long ccsr;
	unsigned int l, L, k, K;

	ccsr = CCSR;

	l = ccsr & 0x1f;
	k = (l <= 7) ? 1 : (l <= 16) ? 2 : 4;

	L = l * BASE_CLK;
	K = L / k;

	return (K / 10000);
}

static unsigned long clk_pxa27x_lcd_getrate(struct clk *clk)
{
	return pxa27x_get_lcdclk_frequency_10khz() * 10000;
}

static const struct clkops clk_pxa27x_lcd_ops = {
	.enable		= clk_cken_enable,
	.disable	= clk_cken_disable,
	.getrate	= clk_pxa27x_lcd_getrate,
};

static DEFINE_CK(pxa27x_lcd, LCD, &clk_pxa27x_lcd_ops);
static DEFINE_CK(pxa27x_camera, CAMERA, &clk_pxa27x_lcd_ops);
static DEFINE_CKEN(pxa27x_ffuart, FFUART, 14857000, 1);
static DEFINE_CKEN(pxa27x_btuart, BTUART, 14857000, 1);
static DEFINE_CKEN(pxa27x_stuart, STUART, 14857000, 1);
static DEFINE_CKEN(pxa27x_i2s, I2S, 14682000, 0);
static DEFINE_CKEN(pxa27x_i2c, I2C, 32842000, 0);
static DEFINE_CKEN(pxa27x_usb, USB, 48000000, 5);
static DEFINE_CKEN(pxa27x_mmc, MMC, 19500000, 0);
static DEFINE_CKEN(pxa27x_ficp, FICP, 48000000, 0);
static DEFINE_CKEN(pxa27x_usbhost, USBHOST, 48000000, 0);
static DEFINE_CKEN(pxa27x_pwri2c, PWRI2C, 13000000, 0);
static DEFINE_CKEN(pxa27x_keypad, KEYPAD, 32768, 0);
static DEFINE_CKEN(pxa27x_ssp1, SSP1, 13000000, 0);
static DEFINE_CKEN(pxa27x_ssp2, SSP2, 13000000, 0);
static DEFINE_CKEN(pxa27x_ssp3, SSP3, 13000000, 0);
static DEFINE_CKEN(pxa27x_pwm0, PWM0, 13000000, 0);
static DEFINE_CKEN(pxa27x_pwm1, PWM1, 13000000, 0);
static DEFINE_CKEN(pxa27x_ac97, AC97, 24576000, 0);
static DEFINE_CKEN(pxa27x_ac97conf, AC97CONF, 24576000, 0);
static DEFINE_CKEN(pxa27x_msl, MSL, 48000000, 0);
static DEFINE_CKEN(pxa27x_usim, USIM, 48000000, 0);
static DEFINE_CKEN(pxa27x_memstk, MEMSTK, 19500000, 0);
static DEFINE_CKEN(pxa27x_im, IM, 0, 0);
static DEFINE_CKEN(pxa27x_memc, MEMC, 0, 0);

static struct clk_lookup pxa27x_clkregs[] = {
	INIT_CLKREG(&clk_pxa27x_lcd, "pxa2xx-fb", NULL),
	INIT_CLKREG(&clk_pxa27x_camera, "pxa27x-camera.0", NULL),
	INIT_CLKREG(&clk_pxa27x_ffuart, "pxa2xx-uart.0", NULL),
	INIT_CLKREG(&clk_pxa27x_btuart, "pxa2xx-uart.1", NULL),
	INIT_CLKREG(&clk_pxa27x_stuart, "pxa2xx-uart.2", NULL),
	INIT_CLKREG(&clk_pxa27x_i2s, "pxa2xx-i2s", NULL),
	INIT_CLKREG(&clk_pxa27x_i2c, "pxa2xx-i2c.0", NULL),
	INIT_CLKREG(&clk_pxa27x_usb, "pxa27x-udc", NULL),
	INIT_CLKREG(&clk_pxa27x_mmc, "pxa2xx-mci.0", NULL),
	INIT_CLKREG(&clk_pxa27x_stuart, "pxa2xx-ir", "UARTCLK"),
	INIT_CLKREG(&clk_pxa27x_ficp, "pxa2xx-ir", "FICPCLK"),
	INIT_CLKREG(&clk_pxa27x_usbhost, "pxa27x-ohci", NULL),
	INIT_CLKREG(&clk_pxa27x_pwri2c, "pxa2xx-i2c.1", NULL),
	INIT_CLKREG(&clk_pxa27x_keypad, "pxa27x-keypad", NULL),
	INIT_CLKREG(&clk_pxa27x_ssp1, "pxa27x-ssp.0", NULL),
	INIT_CLKREG(&clk_pxa27x_ssp2, "pxa27x-ssp.1", NULL),
	INIT_CLKREG(&clk_pxa27x_ssp3, "pxa27x-ssp.2", NULL),
	INIT_CLKREG(&clk_pxa27x_pwm0, "pxa27x-pwm.0", NULL),
	INIT_CLKREG(&clk_pxa27x_pwm1, "pxa27x-pwm.1", NULL),
	INIT_CLKREG(&clk_pxa27x_ac97, NULL, "AC97CLK"),
	INIT_CLKREG(&clk_pxa27x_ac97conf, NULL, "AC97CONFCLK"),
	INIT_CLKREG(&clk_pxa27x_msl, NULL, "MSLCLK"),
	INIT_CLKREG(&clk_pxa27x_usim, NULL, "USIMCLK"),
	INIT_CLKREG(&clk_pxa27x_memstk, NULL, "MSTKCLK"),
	INIT_CLKREG(&clk_pxa27x_im, NULL, "IMCLK"),
	INIT_CLKREG(&clk_pxa27x_memc, NULL, "MEMCLK"),
};

#ifdef CONFIG_PM

#define SAVE(x)		sleep_save[SLEEP_SAVE_##x] = x
#define RESTORE(x)	x = sleep_save[SLEEP_SAVE_##x]

/*
 * allow platforms to override default PWRMODE setting used for PM_SUSPEND_MEM
 */
static unsigned int pwrmode = PWRMODE_SLEEP;

int __init pxa27x_set_pwrmode(unsigned int mode)
{
	switch (mode) {
	case PWRMODE_SLEEP:
	case PWRMODE_DEEPSLEEP:
		pwrmode = mode;
		return 0;
	}

	return -EINVAL;
}

/*
 * List of global PXA peripheral registers to preserve.
 * More ones like CP and general purpose register values are preserved
 * with the stack pointer in sleep.S.
 */
enum {
	SLEEP_SAVE_PSTR,
	SLEEP_SAVE_CKEN,
	SLEEP_SAVE_MDREFR,
	SLEEP_SAVE_PCFR,
	SLEEP_SAVE_COUNT
};

void pxa27x_cpu_pm_save(unsigned long *sleep_save)
{
	SAVE(MDREFR);
	SAVE(PCFR);

	SAVE(CKEN);
	SAVE(PSTR);
}

void pxa27x_cpu_pm_restore(unsigned long *sleep_save)
{
	RESTORE(MDREFR);
	RESTORE(PCFR);

	PSSR = PSSR_RDH | PSSR_PH;

	RESTORE(CKEN);
	RESTORE(PSTR);
}

void pxa27x_cpu_pm_enter(suspend_state_t state)
{
	extern void pxa_cpu_standby(void);

	/* ensure voltage-change sequencer not initiated, which hangs */
	PCFR &= ~PCFR_FVC;

	/* Clear edge-detect status register. */
	PEDR = 0xDF12FE1B;

	/* Clear reset status */
	RCSR = RCSR_HWR | RCSR_WDR | RCSR_SMR | RCSR_GPR;

	switch (state) {
	case PM_SUSPEND_STANDBY:
		pxa_cpu_standby();
		break;
	case PM_SUSPEND_MEM:
		pxa27x_cpu_suspend(pwrmode);
		break;
	}
}

static int pxa27x_cpu_pm_valid(suspend_state_t state)
{
	return state == PM_SUSPEND_MEM || state == PM_SUSPEND_STANDBY;
}

static int pxa27x_cpu_pm_prepare(void)
{
	/* set resume return address */
	PSPR = virt_to_phys(pxa_cpu_resume);
	return 0;
}

static void pxa27x_cpu_pm_finish(void)
{
	/* ensure not to come back here if it wasn't intended */
	PSPR = 0;
}

static struct pxa_cpu_pm_fns pxa27x_cpu_pm_fns = {
	.save_count	= SLEEP_SAVE_COUNT,
	.save		= pxa27x_cpu_pm_save,
	.restore	= pxa27x_cpu_pm_restore,
	.valid		= pxa27x_cpu_pm_valid,
	.enter		= pxa27x_cpu_pm_enter,
	.prepare	= pxa27x_cpu_pm_prepare,
	.finish		= pxa27x_cpu_pm_finish,
};

static void __init pxa27x_init_pm(void)
{
	pxa_cpu_pm_fns = &pxa27x_cpu_pm_fns;
}
#else
static inline void pxa27x_init_pm(void) {}
#endif

/* PXA27x:  Various gpios can issue wakeup events.  This logic only
 * handles the simple cases, not the WEMUX2 and WEMUX3 options
 */
static int pxa27x_set_wake(unsigned int irq, unsigned int on)
{
	int gpio = IRQ_TO_GPIO(irq);
	uint32_t mask;

	if (gpio >= 0 && gpio < 128)
		return gpio_set_wake(gpio, on);

	if (irq == IRQ_KEYPAD)
		return keypad_set_wake(on);

	switch (irq) {
	case IRQ_RTCAlrm:
		mask = PWER_RTC;
		break;
	case IRQ_USB:
		mask = 1u << 26;
		break;
	default:
		return -EINVAL;
	}

	if (on)
		PWER |= mask;
	else
		PWER &=~mask;

	return 0;
}

void __init pxa27x_init_irq(void)
{
	pxa_init_irq(34, pxa27x_set_wake);
	pxa_init_gpio(IRQ_GPIO_2_x, 2, 120, pxa27x_set_wake);
}

/*
 * device registration specific to PXA27x.
 */
void __init pxa27x_set_i2c_power_info(struct i2c_pxa_platform_data *info)
{
	local_irq_disable();
	PCFR |= PCFR_PI2CEN;
	local_irq_enable();
	pxa_register_device(&pxa27x_device_i2c_power, info);
}

static struct platform_device *devices[] __initdata = {
	&pxa27x_device_udc,
	&pxa_device_ffuart,
	&pxa_device_btuart,
	&pxa_device_stuart,
	&pxa_device_i2s,
	&sa1100_device_rtc,
	&pxa_device_rtc,
	&pxa27x_device_ssp1,
	&pxa27x_device_ssp2,
	&pxa27x_device_ssp3,
	&pxa27x_device_pwm0,
	&pxa27x_device_pwm1,
};

static struct sys_device pxa27x_sysdev[] = {
	{
		.cls	= &pxa_irq_sysclass,
	}, {
		.cls	= &pxa2xx_mfp_sysclass,
	}, {
		.cls	= &pxa_gpio_sysclass,
	},
};

static int __init pxa27x_init(void)
{
	int i, ret = 0;

	if (cpu_is_pxa27x()) {

		reset_status = RCSR;

		clks_register(pxa27x_clkregs, ARRAY_SIZE(pxa27x_clkregs));

		if ((ret = pxa_init_dma(IRQ_DMA, 32)))
			return ret;

		pxa27x_init_pm();

		for (i = 0; i < ARRAY_SIZE(pxa27x_sysdev); i++) {
			ret = sysdev_register(&pxa27x_sysdev[i]);
			if (ret)
				pr_err("failed to register sysdev[%d]\n", i);
		}

		ret = platform_add_devices(devices, ARRAY_SIZE(devices));
	}

	return ret;
}

postcore_initcall(pxa27x_init);