arch/arm/mach-pxa/pxa25x.c

   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  */
  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
  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
 123 static void clk_gpio12_enable(struct clk *clk)
 124 {
 125         pxa2xx_mfp_config(gpio12_config_32k, 1);
 126 }
 127
 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
 146 static void clk_gpio11_enable(struct clk *clk)
 147 {
 148         pxa2xx_mfp_config(gpio11_config_3m6, 1);
 149 }
 150
 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
 238 static void pxa25x_cpu_pm_save(unsigned long *sleep_save)
 239 {
 240         SAVE(PSTR);
 241 }
 242
 243 static void pxa25x_cpu_pm_restore(unsigned long *sleep_save)
 244 {
 245         RESTORE(PSTR);
 246 }
 247
 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
 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
 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
 283 static void __init pxa25x_init_pm(void)
 284 {
 285         pxa_cpu_pm_fns = &pxa25x_cpu_pm_fns;
 286 }
 287 #else
 288 static inline void pxa25x_init_pm(void) {}
 289 #endif
 290
 291 /* PXA25x: supports wakeup from GPIO0..GPIO15 and RTC alarm
 292  */
 293
 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
 318 void __init pxa25x_init_irq(void)
 319 {
 320         pxa_init_irq(32, pxa25x_set_wake);
 321 }
 322
 323 #ifdef CONFIG_CPU_PXA26x
 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         = SMEMC_SIZE,
 335                 .type           = MT_DEVICE
 336         }, {    /* UNCACHED_PHYS_0 */
 337                 .virtual        = UNCACHED_PHYS_0,
 338                 .pfn            = __phys_to_pfn(0x00000000),
 339                 .length         = UNCACHED_PHYS_0_SIZE,
 340                 .type           = MT_DEVICE
 341         },
 342 };
 343
 344 void __init pxa25x_map_io(void)
 345 {
 346         pxa_map_io();
 347         iotable_init(ARRAY_AND_SIZE(pxa25x_io_desc));
 348         pxa25x_get_clk_frequency_khz(1);
 349 }
 350
 351 static struct pxa_gpio_platform_data pxa25x_gpio_info __initdata = {
 352         .irq_base       = PXA_GPIO_TO_IRQ(0),
 353         .gpio_set_wake  = gpio_set_wake,
 354 };
 355
 356 static struct platform_device *pxa25x_devices[] __initdata = {
 357         &pxa25x_device_udc,
 358         &pxa_device_pmu,
 359         &pxa_device_i2s,
 360         &sa1100_device_rtc,
 361         &pxa25x_device_ssp,
 362         &pxa25x_device_nssp,
 363         &pxa25x_device_assp,
 364         &pxa25x_device_pwm0,
 365         &pxa25x_device_pwm1,
 366         &pxa_device_asoc_platform,
 367 };
 368
 369 static int __init pxa25x_init(void)
 370 {
 371         int ret = 0;
 372
 373         if (cpu_is_pxa25x()) {
 374
 375                 reset_status = RCSR;
 376
 377                 clkdev_add_table(pxa25x_clkregs, ARRAY_SIZE(pxa25x_clkregs));
 378
 379                 if ((ret = pxa_init_dma(IRQ_DMA, 16)))
 380                         return ret;
 381
 382                 pxa25x_init_pm();
 383
 384                 register_syscore_ops(&pxa_irq_syscore_ops);
 385                 register_syscore_ops(&pxa2xx_mfp_syscore_ops);
 386                 register_syscore_ops(&pxa2xx_clock_syscore_ops);
 387
 388                 pxa_register_device(&pxa25x_device_gpio, &pxa25x_gpio_info);
 389                 ret = platform_add_devices(pxa25x_devices,
 390                                            ARRAY_SIZE(pxa25x_devices));
 391                 if (ret)
 392                         return ret;
 393         }
 394
 395         /* Only add HWUART for PXA255/26x; PXA210/250 do not have it. */
 396         if (cpu_is_pxa255())
 397                 clkdev_add(&pxa25x_hwuart_clkreg);
 398
 399         return ret;
 400 }
 401
 402 postcore_initcall(pxa25x_init);