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/module.h>
  20 #include <linux/kernel.h>
  21 #include <linux/init.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/suspend.h>
  24 #include <linux/sysdev.h>
  25
  26 #include <mach/hardware.h>
  27 #include <mach/irqs.h>
  28 #include <mach/gpio.h>
  29 #include <mach/pxa25x.h>
  30 #include <mach/reset.h>
  31 #include <mach/pm.h>
  32 #include <mach/dma.h>
  33
  34 #include "generic.h"
  35 #include "devices.h"
  36 #include "clock.h"
  37
  38 /*
  39  * Various clock factors driven by the CCCR register.
  40  */
  41
  42 /* Crystal Frequency to Memory Frequency Multiplier (L) */
  43 static unsigned char L_clk_mult[32] = { 0, 27, 32, 36, 40, 45, 0, };
  44
  45 /* Memory Frequency to Run Mode Frequency Multiplier (M) */
  46 static unsigned char M_clk_mult[4] = { 0, 1, 2, 4 };
  47
  48 /* Run Mode Frequency to Turbo Mode Frequency Multiplier (N) */
  49 /* Note: we store the value N * 2 here. */
  50 static unsigned char N2_clk_mult[8] = { 0, 0, 2, 3, 4, 0, 6, 0 };
  51
  52 /* Crystal clock */
  53 #define BASE_CLK        3686400
  54
  55 /*
  56  * Get the clock frequency as reflected by CCCR and the turbo flag.
  57  * We assume these values have been applied via a fcs.
  58  * If info is not 0 we also display the current settings.
  59  */
  60 unsigned int pxa25x_get_clk_frequency_khz(int info)
  61 {
  62         unsigned long cccr, turbo;
  63         unsigned int l, L, m, M, n2, N;
  64
  65         cccr = CCCR;
  66         asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (turbo) );
  67
  68         l  =  L_clk_mult[(cccr >> 0) & 0x1f];
  69         m  =  M_clk_mult[(cccr >> 5) & 0x03];
  70         n2 = N2_clk_mult[(cccr >> 7) & 0x07];
  71
  72         L = l * BASE_CLK;
  73         M = m * L;
  74         N = n2 * M / 2;
  75
  76         if(info)
  77         {
  78                 L += 5000;
  79                 printk( KERN_INFO "Memory clock: %d.%02dMHz (*%d)\n",
  80                         L / 1000000, (L % 1000000) / 10000, l );
  81                 M += 5000;
  82                 printk( KERN_INFO "Run Mode clock: %d.%02dMHz (*%d)\n",
  83                         M / 1000000, (M % 1000000) / 10000, m );
  84                 N += 5000;
  85                 printk( KERN_INFO "Turbo Mode clock: %d.%02dMHz (*%d.%d, %sactive)\n",
  86                         N / 1000000, (N % 1000000) / 10000, n2 / 2, (n2 % 2) * 5,
  87                         (turbo & 1) ? "" : "in" );
  88         }
  89
  90         return (turbo & 1) ? (N/1000) : (M/1000);
  91 }
  92
  93 /*
  94  * Return the current memory clock frequency in units of 10kHz
  95  */
  96 unsigned int pxa25x_get_memclk_frequency_10khz(void)
  97 {
  98         return L_clk_mult[(CCCR >> 0) & 0x1f] * BASE_CLK / 10000;
  99 }
 100
 101 static unsigned long clk_pxa25x_lcd_getrate(struct clk *clk)
 102 {
 103         return pxa25x_get_memclk_frequency_10khz() * 10000;
 104 }
 105
 106 static const struct clkops clk_pxa25x_lcd_ops = {
 107         .enable         = clk_cken_enable,
 108         .disable        = clk_cken_disable,
 109         .getrate        = clk_pxa25x_lcd_getrate,
 110 };
 111
 112 static unsigned long gpio12_config_32k[] = {
 113         GPIO12_32KHz,
 114 };
 115
 116 static unsigned long gpio12_config_gpio[] = {
 117         GPIO12_GPIO,
 118 };
 119
 120 static void clk_gpio12_enable(struct clk *clk)
 121 {
 122         pxa2xx_mfp_config(gpio12_config_32k, 1);
 123 }
 124
 125 static void clk_gpio12_disable(struct clk *clk)
 126 {
 127         pxa2xx_mfp_config(gpio12_config_gpio, 1);
 128 }
 129
 130 static const struct clkops clk_pxa25x_gpio12_ops = {
 131         .enable         = clk_gpio12_enable,
 132         .disable        = clk_gpio12_disable,
 133 };
 134
 135 static unsigned long gpio11_config_3m6[] = {
 136         GPIO11_3_6MHz,
 137 };
 138
 139 static unsigned long gpio11_config_gpio[] = {
 140         GPIO11_GPIO,
 141 };
 142
 143 static void clk_gpio11_enable(struct clk *clk)
 144 {
 145         pxa2xx_mfp_config(gpio11_config_3m6, 1);
 146 }
 147
 148 static void clk_gpio11_disable(struct clk *clk)
 149 {
 150         pxa2xx_mfp_config(gpio11_config_gpio, 1);
 151 }
 152
 153 static const struct clkops clk_pxa25x_gpio11_ops = {
 154         .enable         = clk_gpio11_enable,
 155         .disable        = clk_gpio11_disable,
 156 };
 157
 158 /*
 159  * 3.6864MHz -> OST, GPIO, SSP, PWM, PLLs (95.842MHz, 147.456MHz)
 160  * 95.842MHz -> MMC 19.169MHz, I2C 31.949MHz, FICP 47.923MHz, USB 47.923MHz
 161  * 147.456MHz -> UART 14.7456MHz, AC97 12.288MHz, I2S 5.672MHz (allegedly)
 162  */
 163 static DEFINE_CKEN(pxa25x_hwuart, HWUART, 14745600, 1);
 164
 165 static struct clk_lookup pxa25x_hwuart_clkreg =
 166         INIT_CLKREG(&clk_pxa25x_hwuart, "pxa2xx-uart.3", NULL);
 167
 168 /*
 169  * PXA 2xx clock declarations.
 170  */
 171 static DEFINE_CK(pxa25x_lcd, LCD, &clk_pxa25x_lcd_ops);
 172 static DEFINE_CKEN(pxa25x_ffuart, FFUART, 14745600, 1);
 173 static DEFINE_CKEN(pxa25x_btuart, BTUART, 14745600, 1);
 174 static DEFINE_CKEN(pxa25x_stuart, STUART, 14745600, 1);
 175 static DEFINE_CKEN(pxa25x_usb, USB, 47923000, 5);
 176 static DEFINE_CLK(pxa25x_gpio11, &clk_pxa25x_gpio11_ops, 3686400, 0);
 177 static DEFINE_CLK(pxa25x_gpio12, &clk_pxa25x_gpio12_ops, 32768, 0);
 178 static DEFINE_CKEN(pxa25x_mmc, MMC, 19169000, 0);
 179 static DEFINE_CKEN(pxa25x_i2c, I2C, 31949000, 0);
 180 static DEFINE_CKEN(pxa25x_ssp, SSP, 3686400, 0);
 181 static DEFINE_CKEN(pxa25x_nssp, NSSP, 3686400, 0);
 182 static DEFINE_CKEN(pxa25x_assp, ASSP, 3686400, 0);
 183 static DEFINE_CKEN(pxa25x_pwm0, PWM0, 3686400, 0);
 184 static DEFINE_CKEN(pxa25x_pwm1, PWM1, 3686400, 0);
 185 static DEFINE_CKEN(pxa25x_ac97, AC97, 24576000, 0);
 186 static DEFINE_CKEN(pxa25x_i2s, I2S, 14745600, 0);
 187 static DEFINE_CKEN(pxa25x_ficp, FICP, 47923000, 0);
 188
 189 static struct clk_lookup pxa25x_clkregs[] = {
 190         INIT_CLKREG(&clk_pxa25x_lcd, "pxa2xx-fb", NULL),
 191         INIT_CLKREG(&clk_pxa25x_ffuart, "pxa2xx-uart.0", NULL),
 192         INIT_CLKREG(&clk_pxa25x_btuart, "pxa2xx-uart.1", NULL),
 193         INIT_CLKREG(&clk_pxa25x_stuart, "pxa2xx-uart.2", NULL),
 194         INIT_CLKREG(&clk_pxa25x_usb, "pxa25x-udc", NULL),
 195         INIT_CLKREG(&clk_pxa25x_mmc, "pxa2xx-mci.0", NULL),
 196         INIT_CLKREG(&clk_pxa25x_i2c, "pxa2xx-i2c.0", NULL),
 197         INIT_CLKREG(&clk_pxa25x_ssp, "pxa25x-ssp.0", NULL),
 198         INIT_CLKREG(&clk_pxa25x_nssp, "pxa25x-nssp.1", NULL),
 199         INIT_CLKREG(&clk_pxa25x_assp, "pxa25x-nssp.2", NULL),
 200         INIT_CLKREG(&clk_pxa25x_pwm0, "pxa25x-pwm.0", NULL),
 201         INIT_CLKREG(&clk_pxa25x_pwm1, "pxa25x-pwm.1", NULL),
 202         INIT_CLKREG(&clk_pxa25x_i2s, "pxa2xx-i2s", NULL),
 203         INIT_CLKREG(&clk_pxa25x_stuart, "pxa2xx-ir", "UARTCLK"),
 204         INIT_CLKREG(&clk_pxa25x_ficp, "pxa2xx-ir", "FICPCLK"),
 205         INIT_CLKREG(&clk_pxa25x_ac97, NULL, "AC97CLK"),
 206         INIT_CLKREG(&clk_pxa25x_gpio11, NULL, "GPIO11_CLK"),
 207         INIT_CLKREG(&clk_pxa25x_gpio12, NULL, "GPIO12_CLK"),
 208 };
 209
 210 #ifdef CONFIG_PM
 211
 212 #define SAVE(x)         sleep_save[SLEEP_SAVE_##x] = x
 213 #define RESTORE(x)      x = sleep_save[SLEEP_SAVE_##x]
 214
 215 /*
 216  * List of global PXA peripheral registers to preserve.
 217  * More ones like CP and general purpose register values are preserved
 218  * with the stack pointer in sleep.S.
 219  */
 220 enum {
 221         SLEEP_SAVE_PSTR,
 222         SLEEP_SAVE_CKEN,
 223         SLEEP_SAVE_COUNT
 224 };
 225
 226
 227 static void pxa25x_cpu_pm_save(unsigned long *sleep_save)
 228 {
 229         SAVE(CKEN);
 230         SAVE(PSTR);
 231 }
 232
 233 static void pxa25x_cpu_pm_restore(unsigned long *sleep_save)
 234 {
 235         RESTORE(CKEN);
 236         RESTORE(PSTR);
 237 }
 238
 239 static void pxa25x_cpu_pm_enter(suspend_state_t state)
 240 {
 241         /* Clear reset status */
 242         RCSR = RCSR_HWR | RCSR_WDR | RCSR_SMR | RCSR_GPR;
 243
 244         switch (state) {
 245         case PM_SUSPEND_MEM:
 246                 pxa25x_cpu_suspend(PWRMODE_SLEEP);
 247                 break;
 248         }
 249 }
 250
 251 static int pxa25x_cpu_pm_prepare(void)
 252 {
 253         /* set resume return address */
 254         PSPR = virt_to_phys(pxa_cpu_resume);
 255         return 0;
 256 }
 257
 258 static void pxa25x_cpu_pm_finish(void)
 259 {
 260         /* ensure not to come back here if it wasn't intended */
 261         PSPR = 0;
 262 }
 263
 264 static struct pxa_cpu_pm_fns pxa25x_cpu_pm_fns = {
 265         .save_count     = SLEEP_SAVE_COUNT,
 266         .valid          = suspend_valid_only_mem,
 267         .save           = pxa25x_cpu_pm_save,
 268         .restore        = pxa25x_cpu_pm_restore,
 269         .enter          = pxa25x_cpu_pm_enter,
 270         .prepare        = pxa25x_cpu_pm_prepare,
 271         .finish         = pxa25x_cpu_pm_finish,
 272 };
 273
 274 static void __init pxa25x_init_pm(void)
 275 {
 276         pxa_cpu_pm_fns = &pxa25x_cpu_pm_fns;
 277 }
 278 #else
 279 static inline void pxa25x_init_pm(void) {}
 280 #endif
 281
 282 /* PXA25x: supports wakeup from GPIO0..GPIO15 and RTC alarm
 283  */
 284
 285 static int pxa25x_set_wake(unsigned int irq, unsigned int on)
 286 {
 287         int gpio = IRQ_TO_GPIO(irq);
 288         uint32_t mask = 0;
 289
 290         if (gpio >= 0 && gpio < 85)
 291                 return gpio_set_wake(gpio, on);
 292
 293         if (irq == IRQ_RTCAlrm) {
 294                 mask = PWER_RTC;
 295                 goto set_pwer;
 296         }
 297
 298         return -EINVAL;
 299
 300 set_pwer:
 301         if (on)
 302                 PWER |= mask;
 303         else
 304                 PWER &=~mask;
 305
 306         return 0;
 307 }
 308
 309 void __init pxa25x_init_irq(void)
 310 {
 311         pxa_init_irq(32, pxa25x_set_wake);
 312         pxa_init_gpio(IRQ_GPIO_2_x, 2, 84, pxa25x_set_wake);
 313 }
 314
 315 #ifdef CONFIG_CPU_PXA26x
 316 void __init pxa26x_init_irq(void)
 317 {
 318         pxa_init_irq(32, pxa25x_set_wake);
 319         pxa_init_gpio(IRQ_GPIO_2_x, 2, 89, pxa25x_set_wake);
 320 }
 321 #endif
 322
 323 static struct platform_device *pxa25x_devices[] __initdata = {
 324         &pxa25x_device_udc,
 325         &pxa_device_ffuart,
 326         &pxa_device_btuart,
 327         &pxa_device_stuart,
 328         &pxa_device_i2s,
 329         &sa1100_device_rtc,
 330         &pxa25x_device_ssp,
 331         &pxa25x_device_nssp,
 332         &pxa25x_device_assp,
 333         &pxa25x_device_pwm0,
 334         &pxa25x_device_pwm1,
 335 };
 336
 337 static struct sys_device pxa25x_sysdev[] = {
 338         {
 339                 .cls    = &pxa_irq_sysclass,
 340         }, {
 341                 .cls    = &pxa2xx_mfp_sysclass,
 342         }, {
 343                 .cls    = &pxa_gpio_sysclass,
 344         },
 345 };
 346
 347 static int __init pxa25x_init(void)
 348 {
 349         int i, ret = 0;
 350
 351         if (cpu_is_pxa25x()) {
 352
 353                 reset_status = RCSR;
 354
 355                 clks_register(pxa25x_clkregs, ARRAY_SIZE(pxa25x_clkregs));
 356
 357                 if ((ret = pxa_init_dma(IRQ_DMA, 16)))
 358                         return ret;
 359
 360                 pxa25x_init_pm();
 361
 362                 for (i = 0; i < ARRAY_SIZE(pxa25x_sysdev); i++) {
 363                         ret = sysdev_register(&pxa25x_sysdev[i]);
 364                         if (ret)
 365                                 pr_err("failed to register sysdev[%d]\n", i);
 366                 }
 367
 368                 ret = platform_add_devices(pxa25x_devices,
 369                                            ARRAY_SIZE(pxa25x_devices));
 370                 if (ret)
 371                         return ret;
 372         }
 373
 374         /* Only add HWUART for PXA255/26x; PXA210/250 do not have it. */
 375         if (cpu_is_pxa255()) {
 376                 clks_register(&pxa25x_hwuart_clkreg, 1);
 377                 ret = platform_device_register(&pxa_device_hwuart);
 378         }
 379
 380         return ret;
 381 }
 382
 383 postcore_initcall(pxa25x_init);