1 /*
2 * linux/arch/arm/mach-pxa/pxa25x.c
3 *
4 * Author: Nicolas Pitre
5 * Created: Jun 15, 2001
6 * Copyright: MontaVista Software Inc.
7 *
8 * Code specific to PXA21x/25x/26x variants.
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 *
14 * Since this file should be linked before any other machine specific file,
15 * the __initcall() here will be executed first. This serves as default
16 * initialization stuff for PXA machines which can be overridden later if
17 * need be.
18 */
19 #include <linux/gpio.h>
20 #include <linux/gpio-pxa.h>
21 #include <linux/module.h>
22 #include <linux/kernel.h>
23 #include <linux/init.h>
24 #include <linux/platform_device.h>
25 #include <linux/suspend.h>
26 #include <linux/syscore_ops.h>
27 #include <linux/irq.h>
28
29 #include <asm/mach/map.h>
30 #include <asm/suspend.h>
31 #include <mach/hardware.h>
32 #include <mach/irqs.h>
33 #include <mach/pxa25x.h>
34 #include <mach/reset.h>
35 #include <mach/pm.h>
36 #include <mach/dma.h>
37 #include <mach/smemc.h>
38
39 #include "generic.h"
40 #include "devices.h"
41 #include "clock.h"
42
43 /*
44 * Various clock factors driven by the CCCR register.
45 */
46
47 /* Crystal Frequency to Memory Frequency Multiplier (L) */
48 static unsigned char L_clk_mult[32] = { 0, 27, 32, 36, 40, 45, 0, };
49
50 /* Memory Frequency to Run Mode Frequency Multiplier (M) */
51 static unsigned char M_clk_mult[4] = { 0, 1, 2, 4 };
52
53 /* Run Mode Frequency to Turbo Mode Frequency Multiplier (N) */
54 /* Note: we store the value N * 2 here. */
55 static unsigned char N2_clk_mult[8] = { 0, 0, 2, 3, 4, 0, 6, 0 };
56
57 /* Crystal clock */
58 #define BASE_CLK 3686400
59
60 /*
61 * Get the clock frequency as reflected by CCCR and the turbo flag.
62 * We assume these values have been applied via a fcs.
63 * If info is not 0 we also display the current settings.
64 */
pxa25x_get_clk_frequency_khz(int info)65 unsigned int pxa25x_get_clk_frequency_khz(int info)
66 {
67 unsigned long cccr, turbo;
68 unsigned int l, L, m, M, n2, N;
69
70 cccr = CCCR;
71 asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (turbo) );
72
73 l = L_clk_mult[(cccr >> 0) & 0x1f];
74 m = M_clk_mult[(cccr >> 5) & 0x03];
75 n2 = N2_clk_mult[(cccr >> 7) & 0x07];
76
77 L = l * BASE_CLK;
78 M = m * L;
79 N = n2 * M / 2;
80
81 if(info)
82 {
83 L += 5000;
84 printk( KERN_INFO "Memory clock: %d.%02dMHz (*%d)\n",
85 L / 1000000, (L % 1000000) / 10000, l );
86 M += 5000;
87 printk( KERN_INFO "Run Mode clock: %d.%02dMHz (*%d)\n",
88 M / 1000000, (M % 1000000) / 10000, m );
89 N += 5000;
90 printk( KERN_INFO "Turbo Mode clock: %d.%02dMHz (*%d.%d, %sactive)\n",
91 N / 1000000, (N % 1000000) / 10000, n2 / 2, (n2 % 2) * 5,
92 (turbo & 1) ? "" : "in" );
93 }
94
95 return (turbo & 1) ? (N/1000) : (M/1000);
96 }
97
clk_pxa25x_mem_getrate(struct clk * clk)98 static unsigned long clk_pxa25x_mem_getrate(struct clk *clk)
99 {
100 return L_clk_mult[(CCCR >> 0) & 0x1f] * BASE_CLK;
101 }
102
103 static const struct clkops clk_pxa25x_mem_ops = {
104 .enable = clk_dummy_enable,
105 .disable = clk_dummy_disable,
106 .getrate = clk_pxa25x_mem_getrate,
107 };
108
109 static const struct clkops clk_pxa25x_lcd_ops = {
110 .enable = clk_pxa2xx_cken_enable,
111 .disable = clk_pxa2xx_cken_disable,
112 .getrate = clk_pxa25x_mem_getrate,
113 };
114
115 static unsigned long gpio12_config_32k[] = {
116 GPIO12_32KHz,
117 };
118
119 static unsigned long gpio12_config_gpio[] = {
120 GPIO12_GPIO,
121 };
122
clk_gpio12_enable(struct clk * clk)123 static void clk_gpio12_enable(struct clk *clk)
124 {
125 pxa2xx_mfp_config(gpio12_config_32k, 1);
126 }
127
clk_gpio12_disable(struct clk * clk)128 static void clk_gpio12_disable(struct clk *clk)
129 {
130 pxa2xx_mfp_config(gpio12_config_gpio, 1);
131 }
132
133 static const struct clkops clk_pxa25x_gpio12_ops = {
134 .enable = clk_gpio12_enable,
135 .disable = clk_gpio12_disable,
136 };
137
138 static unsigned long gpio11_config_3m6[] = {
139 GPIO11_3_6MHz,
140 };
141
142 static unsigned long gpio11_config_gpio[] = {
143 GPIO11_GPIO,
144 };
145
clk_gpio11_enable(struct clk * clk)146 static void clk_gpio11_enable(struct clk *clk)
147 {
148 pxa2xx_mfp_config(gpio11_config_3m6, 1);
149 }
150
clk_gpio11_disable(struct clk * clk)151 static void clk_gpio11_disable(struct clk *clk)
152 {
153 pxa2xx_mfp_config(gpio11_config_gpio, 1);
154 }
155
156 static const struct clkops clk_pxa25x_gpio11_ops = {
157 .enable = clk_gpio11_enable,
158 .disable = clk_gpio11_disable,
159 };
160
161 /*
162 * 3.6864MHz -> OST, GPIO, SSP, PWM, PLLs (95.842MHz, 147.456MHz)
163 * 95.842MHz -> MMC 19.169MHz, I2C 31.949MHz, FICP 47.923MHz, USB 47.923MHz
164 * 147.456MHz -> UART 14.7456MHz, AC97 12.288MHz, I2S 5.672MHz (allegedly)
165 */
166
167 /*
168 * PXA 2xx clock declarations.
169 */
170 static DEFINE_PXA2_CKEN(pxa25x_hwuart, HWUART, 14745600, 1);
171 static DEFINE_PXA2_CKEN(pxa25x_ffuart, FFUART, 14745600, 1);
172 static DEFINE_PXA2_CKEN(pxa25x_btuart, BTUART, 14745600, 1);
173 static DEFINE_PXA2_CKEN(pxa25x_stuart, STUART, 14745600, 1);
174 static DEFINE_PXA2_CKEN(pxa25x_usb, USB, 47923000, 5);
175 static DEFINE_PXA2_CKEN(pxa25x_mmc, MMC, 19169000, 0);
176 static DEFINE_PXA2_CKEN(pxa25x_i2c, I2C, 31949000, 0);
177 static DEFINE_PXA2_CKEN(pxa25x_ssp, SSP, 3686400, 0);
178 static DEFINE_PXA2_CKEN(pxa25x_nssp, NSSP, 3686400, 0);
179 static DEFINE_PXA2_CKEN(pxa25x_assp, ASSP, 3686400, 0);
180 static DEFINE_PXA2_CKEN(pxa25x_pwm0, PWM0, 3686400, 0);
181 static DEFINE_PXA2_CKEN(pxa25x_pwm1, PWM1, 3686400, 0);
182 static DEFINE_PXA2_CKEN(pxa25x_ac97, AC97, 24576000, 0);
183 static DEFINE_PXA2_CKEN(pxa25x_i2s, I2S, 14745600, 0);
184 static DEFINE_PXA2_CKEN(pxa25x_ficp, FICP, 47923000, 0);
185
186 static DEFINE_CK(pxa25x_lcd, LCD, &clk_pxa25x_lcd_ops);
187 static DEFINE_CLK(pxa25x_gpio11, &clk_pxa25x_gpio11_ops, 3686400, 0);
188 static DEFINE_CLK(pxa25x_gpio12, &clk_pxa25x_gpio12_ops, 32768, 0);
189 static DEFINE_CLK(pxa25x_mem, &clk_pxa25x_mem_ops, 0, 0);
190
191 static struct clk_lookup pxa25x_clkregs[] = {
192 INIT_CLKREG(&clk_pxa25x_lcd, "pxa2xx-fb", NULL),
193 INIT_CLKREG(&clk_pxa25x_ffuart, "pxa2xx-uart.0", NULL),
194 INIT_CLKREG(&clk_pxa25x_btuart, "pxa2xx-uart.1", NULL),
195 INIT_CLKREG(&clk_pxa25x_stuart, "pxa2xx-uart.2", NULL),
196 INIT_CLKREG(&clk_pxa25x_usb, "pxa25x-udc", NULL),
197 INIT_CLKREG(&clk_pxa25x_mmc, "pxa2xx-mci.0", NULL),
198 INIT_CLKREG(&clk_pxa25x_i2c, "pxa2xx-i2c.0", NULL),
199 INIT_CLKREG(&clk_pxa25x_ssp, "pxa25x-ssp.0", NULL),
200 INIT_CLKREG(&clk_pxa25x_nssp, "pxa25x-nssp.1", NULL),
201 INIT_CLKREG(&clk_pxa25x_assp, "pxa25x-nssp.2", NULL),
202 INIT_CLKREG(&clk_pxa25x_pwm0, "pxa25x-pwm.0", NULL),
203 INIT_CLKREG(&clk_pxa25x_pwm1, "pxa25x-pwm.1", NULL),
204 INIT_CLKREG(&clk_pxa25x_i2s, "pxa2xx-i2s", NULL),
205 INIT_CLKREG(&clk_pxa25x_stuart, "pxa2xx-ir", "UARTCLK"),
206 INIT_CLKREG(&clk_pxa25x_ficp, "pxa2xx-ir", "FICPCLK"),
207 INIT_CLKREG(&clk_pxa25x_ac97, NULL, "AC97CLK"),
208 INIT_CLKREG(&clk_pxa25x_gpio11, NULL, "GPIO11_CLK"),
209 INIT_CLKREG(&clk_pxa25x_gpio12, NULL, "GPIO12_CLK"),
210 INIT_CLKREG(&clk_pxa25x_mem, "pxa2xx-pcmcia", NULL),
211 #ifdef CONFIG_CPU_PXA26x
212 INIT_CLKREG(&clk_dummy, "pxa26x-gpio", NULL),
213 #else
214 INIT_CLKREG(&clk_dummy, "pxa25x-gpio", NULL),
215 #endif
216 INIT_CLKREG(&clk_dummy, "sa1100-rtc", NULL),
217 };
218
219 static struct clk_lookup pxa25x_hwuart_clkreg =
220 INIT_CLKREG(&clk_pxa25x_hwuart, "pxa2xx-uart.3", NULL);
221
222 #ifdef CONFIG_PM
223
224 #define SAVE(x) sleep_save[SLEEP_SAVE_##x] = x
225 #define RESTORE(x) x = sleep_save[SLEEP_SAVE_##x]
226
227 /*
228 * List of global PXA peripheral registers to preserve.
229 * More ones like CP and general purpose register values are preserved
230 * with the stack pointer in sleep.S.
231 */
232 enum {
233 SLEEP_SAVE_PSTR,
234 SLEEP_SAVE_COUNT
235 };
236
237
pxa25x_cpu_pm_save(unsigned long * sleep_save)238 static void pxa25x_cpu_pm_save(unsigned long *sleep_save)
239 {
240 SAVE(PSTR);
241 }
242
pxa25x_cpu_pm_restore(unsigned long * sleep_save)243 static void pxa25x_cpu_pm_restore(unsigned long *sleep_save)
244 {
245 RESTORE(PSTR);
246 }
247
pxa25x_cpu_pm_enter(suspend_state_t state)248 static void pxa25x_cpu_pm_enter(suspend_state_t state)
249 {
250 /* Clear reset status */
251 RCSR = RCSR_HWR | RCSR_WDR | RCSR_SMR | RCSR_GPR;
252
253 switch (state) {
254 case PM_SUSPEND_MEM:
255 cpu_suspend(PWRMODE_SLEEP, pxa25x_finish_suspend);
256 break;
257 }
258 }
259
pxa25x_cpu_pm_prepare(void)260 static int pxa25x_cpu_pm_prepare(void)
261 {
262 /* set resume return address */
263 PSPR = virt_to_phys(cpu_resume);
264 return 0;
265 }
266
pxa25x_cpu_pm_finish(void)267 static void pxa25x_cpu_pm_finish(void)
268 {
269 /* ensure not to come back here if it wasn't intended */
270 PSPR = 0;
271 }
272
273 static struct pxa_cpu_pm_fns pxa25x_cpu_pm_fns = {
274 .save_count = SLEEP_SAVE_COUNT,
275 .valid = suspend_valid_only_mem,
276 .save = pxa25x_cpu_pm_save,
277 .restore = pxa25x_cpu_pm_restore,
278 .enter = pxa25x_cpu_pm_enter,
279 .prepare = pxa25x_cpu_pm_prepare,
280 .finish = pxa25x_cpu_pm_finish,
281 };
282
pxa25x_init_pm(void)283 static void __init pxa25x_init_pm(void)
284 {
285 pxa_cpu_pm_fns = &pxa25x_cpu_pm_fns;
286 }
287 #else
pxa25x_init_pm(void)288 static inline void pxa25x_init_pm(void) {}
289 #endif
290
291 /* PXA25x: supports wakeup from GPIO0..GPIO15 and RTC alarm
292 */
293
pxa25x_set_wake(struct irq_data * d,unsigned int on)294 static int pxa25x_set_wake(struct irq_data *d, unsigned int on)
295 {
296 int gpio = pxa_irq_to_gpio(d->irq);
297 uint32_t mask = 0;
298
299 if (gpio >= 0 && gpio < 85)
300 return gpio_set_wake(gpio, on);
301
302 if (d->irq == IRQ_RTCAlrm) {
303 mask = PWER_RTC;
304 goto set_pwer;
305 }
306
307 return -EINVAL;
308
309 set_pwer:
310 if (on)
311 PWER |= mask;
312 else
313 PWER &=~mask;
314
315 return 0;
316 }
317
pxa25x_init_irq(void)318 void __init pxa25x_init_irq(void)
319 {
320 pxa_init_irq(32, pxa25x_set_wake);
321 }
322
323 #ifdef CONFIG_CPU_PXA26x
pxa26x_init_irq(void)324 void __init pxa26x_init_irq(void)
325 {
326 pxa_init_irq(32, pxa25x_set_wake);
327 }
328 #endif
329
330 static struct map_desc pxa25x_io_desc[] __initdata = {
331 { /* Mem Ctl */
332 .virtual = (unsigned long)SMEMC_VIRT,
333 .pfn = __phys_to_pfn(PXA2XX_SMEMC_BASE),
334 .length = 0x00200000,
335 .type = MT_DEVICE
336 },
337 };
338
pxa25x_map_io(void)339 void __init pxa25x_map_io(void)
340 {
341 pxa_map_io();
342 iotable_init(ARRAY_AND_SIZE(pxa25x_io_desc));
343 pxa25x_get_clk_frequency_khz(1);
344 }
345
346 static struct pxa_gpio_platform_data pxa25x_gpio_info __initdata = {
347 .irq_base = PXA_GPIO_TO_IRQ(0),
348 .gpio_set_wake = gpio_set_wake,
349 };
350
351 static struct platform_device *pxa25x_devices[] __initdata = {
352 &pxa25x_device_udc,
353 &pxa_device_pmu,
354 &pxa_device_i2s,
355 &sa1100_device_rtc,
356 &pxa25x_device_ssp,
357 &pxa25x_device_nssp,
358 &pxa25x_device_assp,
359 &pxa25x_device_pwm0,
360 &pxa25x_device_pwm1,
361 &pxa_device_asoc_platform,
362 };
363
pxa25x_init(void)364 static int __init pxa25x_init(void)
365 {
366 int ret = 0;
367
368 if (cpu_is_pxa25x()) {
369
370 reset_status = RCSR;
371
372 clkdev_add_table(pxa25x_clkregs, ARRAY_SIZE(pxa25x_clkregs));
373
374 if ((ret = pxa_init_dma(IRQ_DMA, 16)))
375 return ret;
376
377 pxa25x_init_pm();
378
379 register_syscore_ops(&pxa_irq_syscore_ops);
380 register_syscore_ops(&pxa2xx_mfp_syscore_ops);
381 register_syscore_ops(&pxa2xx_clock_syscore_ops);
382
383 pxa_register_device(&pxa25x_device_gpio, &pxa25x_gpio_info);
384 ret = platform_add_devices(pxa25x_devices,
385 ARRAY_SIZE(pxa25x_devices));
386 if (ret)
387 return ret;
388 }
389
390 /* Only add HWUART for PXA255/26x; PXA210/250 do not have it. */
391 if (cpu_is_pxa255())
392 clkdev_add(&pxa25x_hwuart_clkreg);
393
394 return ret;
395 }
396
397 postcore_initcall(pxa25x_init);
398