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/module.h>
  21 #include <linux/kernel.h>
  22 #include <linux/init.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/suspend.h>
  25 #include <linux/syscore_ops.h>
  26 #include <linux/irq.h>
  27
  28 #include <asm/mach/map.h>
  29 #include <asm/suspend.h>
  30 #include <mach/hardware.h>
  31 #include <mach/irqs.h>
  32 #include <mach/pxa25x.h>
  33 #include <mach/reset.h>
  34 #include <mach/pm.h>
  35 #include <mach/dma.h>
  36 #include <mach/smemc.h>
  37
  38 #include "generic.h"
  39 #include "devices.h"
  40 #include "clock.h"
  41
  42 /*
  43  * Various clock factors driven by the CCCR register.
  44  */
  45
  46 /* Crystal Frequency to Memory Frequency Multiplier (L) */
  47 static unsigned char L_clk_mult[32] = { 0, 27, 32, 36, 40, 45, 0, };
  48
  49 /* Memory Frequency to Run Mode Frequency Multiplier (M) */
  50 static unsigned char M_clk_mult[4] = { 0, 1, 2, 4 };
  51
  52 /* Run Mode Frequency to Turbo Mode Frequency Multiplier (N) */
  53 /* Note: we store the value N * 2 here. */
  54 static unsigned char N2_clk_mult[8] = { 0, 0, 2, 3, 4, 0, 6, 0 };
  55
  56 /* Crystal clock */
  57 #define BASE_CLK        3686400
  58
  59 /*
  60  * Get the clock frequency as reflected by CCCR and the turbo flag.
  61  * We assume these values have been applied via a fcs.
  62  * If info is not 0 we also display the current settings.
  63  */
  64 unsigned int pxa25x_get_clk_frequency_khz(int info)
  65 {
  66         unsigned long cccr, turbo;
  67         unsigned int l, L, m, M, n2, N;
  68
  69         cccr = CCCR;
  70         asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (turbo) );
  71
  72         l  =  L_clk_mult[(cccr >> 0) & 0x1f];
  73         m  =  M_clk_mult[(cccr >> 5) & 0x03];
  74         n2 = N2_clk_mult[(cccr >> 7) & 0x07];
  75
  76         L = l * BASE_CLK;
  77         M = m * L;
  78         N = n2 * M / 2;
  79
  80         if(info)
  81         {
  82                 L += 5000;
  83                 printk( KERN_INFO "Memory clock: %d.%02dMHz (*%d)\n",
  84                         L / 1000000, (L % 1000000) / 10000, l );
  85                 M += 5000;
  86                 printk( KERN_INFO "Run Mode clock: %d.%02dMHz (*%d)\n",
  87                         M / 1000000, (M % 1000000) / 10000, m );
  88                 N += 5000;
  89                 printk( KERN_INFO "Turbo Mode clock: %d.%02dMHz (*%d.%d, %sactive)\n",
  90                         N / 1000000, (N % 1000000) / 10000, n2 / 2, (n2 % 2) * 5,
  91                         (turbo & 1) ? "" : "in" );
  92         }
  93
  94         return (turbo & 1) ? (N/1000) : (M/1000);
  95 }
  96
  97 static unsigned long clk_pxa25x_mem_getrate(struct clk *clk)
  98 {
  99         return L_clk_mult[(CCCR >> 0) & 0x1f] * BASE_CLK;
 100 }
 101
 102 static const struct clkops clk_pxa25x_mem_ops = {
 103         .enable         = clk_dummy_enable,
 104         .disable        = clk_dummy_disable,
 105         .getrate        = clk_pxa25x_mem_getrate,
 106 };
 107
 108 static const struct clkops clk_pxa25x_lcd_ops = {
 109         .enable         = clk_pxa2xx_cken_enable,
 110         .disable        = clk_pxa2xx_cken_disable,
 111         .getrate        = clk_pxa25x_mem_getrate,
 112 };
 113
 114 static unsigned long gpio12_config_32k[] = {
 115         GPIO12_32KHz,
 116 };
 117
 118 static unsigned long gpio12_config_gpio[] = {
 119         GPIO12_GPIO,
 120 };
 121
 122 static void clk_gpio12_enable(struct clk *clk)
 123 {
 124         pxa2xx_mfp_config(gpio12_config_32k, 1);
 125 }
 126
 127 static void clk_gpio12_disable(struct clk *clk)
 128 {
 129         pxa2xx_mfp_config(gpio12_config_gpio, 1);
 130 }
 131
 132 static const struct clkops clk_pxa25x_gpio12_ops = {
 133         .enable         = clk_gpio12_enable,
 134         .disable        = clk_gpio12_disable,
 135 };
 136
 137 static unsigned long gpio11_config_3m6[] = {
 138         GPIO11_3_6MHz,
 139 };
 140
 141 static unsigned long gpio11_config_gpio[] = {
 142         GPIO11_GPIO,
 143 };
 144
 145 static void clk_gpio11_enable(struct clk *clk)
 146 {
 147         pxa2xx_mfp_config(gpio11_config_3m6, 1);
 148 }
 149
 150 static void clk_gpio11_disable(struct clk *clk)
 151 {
 152         pxa2xx_mfp_config(gpio11_config_gpio, 1);
 153 }
 154
 155 static const struct clkops clk_pxa25x_gpio11_ops = {
 156         .enable         = clk_gpio11_enable,
 157         .disable        = clk_gpio11_disable,
 158 };
 159
 160 /*
 161  * 3.6864MHz -> OST, GPIO, SSP, PWM, PLLs (95.842MHz, 147.456MHz)
 162  * 95.842MHz -> MMC 19.169MHz, I2C 31.949MHz, FICP 47.923MHz, USB 47.923MHz
 163  * 147.456MHz -> UART 14.7456MHz, AC97 12.288MHz, I2S 5.672MHz (allegedly)
 164  */
 165
 166 /*
 167  * PXA 2xx clock declarations.
 168  */
 169 static DEFINE_PXA2_CKEN(pxa25x_hwuart, HWUART, 14745600, 1);
 170 static DEFINE_PXA2_CKEN(pxa25x_ffuart, FFUART, 14745600, 1);
 171 static DEFINE_PXA2_CKEN(pxa25x_btuart, BTUART, 14745600, 1);
 172 static DEFINE_PXA2_CKEN(pxa25x_stuart, STUART, 14745600, 1);
 173 static DEFINE_PXA2_CKEN(pxa25x_usb, USB, 47923000, 5);
 174 static DEFINE_PXA2_CKEN(pxa25x_mmc, MMC, 19169000, 0);
 175 static DEFINE_PXA2_CKEN(pxa25x_i2c, I2C, 31949000, 0);
 176 static DEFINE_PXA2_CKEN(pxa25x_ssp, SSP, 3686400, 0);
 177 static DEFINE_PXA2_CKEN(pxa25x_nssp, NSSP, 3686400, 0);
 178 static DEFINE_PXA2_CKEN(pxa25x_assp, ASSP, 3686400, 0);
 179 static DEFINE_PXA2_CKEN(pxa25x_pwm0, PWM0, 3686400, 0);
 180 static DEFINE_PXA2_CKEN(pxa25x_pwm1, PWM1, 3686400, 0);
 181 static DEFINE_PXA2_CKEN(pxa25x_ac97, AC97, 24576000, 0);
 182 static DEFINE_PXA2_CKEN(pxa25x_i2s, I2S, 14745600, 0);
 183 static DEFINE_PXA2_CKEN(pxa25x_ficp, FICP, 47923000, 0);
 184
 185 static DEFINE_CK(pxa25x_lcd, LCD, &clk_pxa25x_lcd_ops);
 186 static DEFINE_CLK(pxa25x_gpio11, &clk_pxa25x_gpio11_ops, 3686400, 0);
 187 static DEFINE_CLK(pxa25x_gpio12, &clk_pxa25x_gpio12_ops, 32768, 0);
 188 static DEFINE_CLK(pxa25x_mem, &clk_pxa25x_mem_ops, 0, 0);
 189
 190 static struct clk_lookup pxa25x_clkregs[] = {
 191         INIT_CLKREG(&clk_pxa25x_lcd, "pxa2xx-fb", NULL),
 192         INIT_CLKREG(&clk_pxa25x_ffuart, "pxa2xx-uart.0", NULL),
 193         INIT_CLKREG(&clk_pxa25x_btuart, "pxa2xx-uart.1", NULL),
 194         INIT_CLKREG(&clk_pxa25x_stuart, "pxa2xx-uart.2", NULL),
 195         INIT_CLKREG(&clk_pxa25x_usb, "pxa25x-udc", NULL),
 196         INIT_CLKREG(&clk_pxa25x_mmc, "pxa2xx-mci.0", NULL),
 197         INIT_CLKREG(&clk_pxa25x_i2c, "pxa2xx-i2c.0", NULL),
 198         INIT_CLKREG(&clk_pxa25x_ssp, "pxa25x-ssp.0", NULL),
 199         INIT_CLKREG(&clk_pxa25x_nssp, "pxa25x-nssp.1", NULL),
 200         INIT_CLKREG(&clk_pxa25x_assp, "pxa25x-nssp.2", NULL),
 201         INIT_CLKREG(&clk_pxa25x_pwm0, "pxa25x-pwm.0", NULL),
 202         INIT_CLKREG(&clk_pxa25x_pwm1, "pxa25x-pwm.1", NULL),
 203         INIT_CLKREG(&clk_pxa25x_i2s, "pxa2xx-i2s", NULL),
 204         INIT_CLKREG(&clk_pxa25x_stuart, "pxa2xx-ir", "UARTCLK"),
 205         INIT_CLKREG(&clk_pxa25x_ficp, "pxa2xx-ir", "FICPCLK"),
 206         INIT_CLKREG(&clk_pxa25x_ac97, NULL, "AC97CLK"),
 207         INIT_CLKREG(&clk_pxa25x_gpio11, NULL, "GPIO11_CLK"),
 208         INIT_CLKREG(&clk_pxa25x_gpio12, NULL, "GPIO12_CLK"),
 209         INIT_CLKREG(&clk_pxa25x_mem, "pxa2xx-pcmcia", NULL),
 210 };
 211
 212 static struct clk_lookup pxa25x_hwuart_clkreg =
 213         INIT_CLKREG(&clk_pxa25x_hwuart, "pxa2xx-uart.3", NULL);
 214
 215 #ifdef CONFIG_PM
 216
 217 #define SAVE(x)         sleep_save[SLEEP_SAVE_##x] = x
 218 #define RESTORE(x)      x = sleep_save[SLEEP_SAVE_##x]
 219
 220 /*
 221  * List of global PXA peripheral registers to preserve.
 222  * More ones like CP and general purpose register values are preserved
 223  * with the stack pointer in sleep.S.
 224  */
 225 enum {
 226         SLEEP_SAVE_PSTR,
 227         SLEEP_SAVE_COUNT
 228 };
 229
 230
 231 static void pxa25x_cpu_pm_save(unsigned long *sleep_save)
 232 {
 233         SAVE(PSTR);
 234 }
 235
 236 static void pxa25x_cpu_pm_restore(unsigned long *sleep_save)
 237 {
 238         RESTORE(PSTR);
 239 }
 240
 241 static void pxa25x_cpu_pm_enter(suspend_state_t state)
 242 {
 243         /* Clear reset status */
 244         RCSR = RCSR_HWR | RCSR_WDR | RCSR_SMR | RCSR_GPR;
 245
 246         switch (state) {
 247         case PM_SUSPEND_MEM:
 248                 cpu_suspend(PWRMODE_SLEEP, pxa25x_finish_suspend);
 249                 break;
 250         }
 251 }
 252
 253 static int pxa25x_cpu_pm_prepare(void)
 254 {
 255         /* set resume return address */
 256         PSPR = virt_to_phys(cpu_resume);
 257         return 0;
 258 }
 259
 260 static void pxa25x_cpu_pm_finish(void)
 261 {
 262         /* ensure not to come back here if it wasn't intended */
 263         PSPR = 0;
 264 }
 265
 266 static struct pxa_cpu_pm_fns pxa25x_cpu_pm_fns = {
 267         .save_count     = SLEEP_SAVE_COUNT,
 268         .valid          = suspend_valid_only_mem,
 269         .save           = pxa25x_cpu_pm_save,
 270         .restore        = pxa25x_cpu_pm_restore,
 271         .enter          = pxa25x_cpu_pm_enter,
 272         .prepare        = pxa25x_cpu_pm_prepare,
 273         .finish         = pxa25x_cpu_pm_finish,
 274 };
 275
 276 static void __init pxa25x_init_pm(void)
 277 {
 278         pxa_cpu_pm_fns = &pxa25x_cpu_pm_fns;
 279 }
 280 #else
 281 static inline void pxa25x_init_pm(void) {}
 282 #endif
 283
 284 /* PXA25x: supports wakeup from GPIO0..GPIO15 and RTC alarm
 285  */
 286
 287 static int pxa25x_set_wake(struct irq_data *d, unsigned int on)
 288 {
 289         int gpio = irq_to_gpio(d->irq);
 290         uint32_t mask = 0;
 291
 292         if (gpio >= 0 && gpio < 85)
 293                 return gpio_set_wake(gpio, on);
 294
 295         if (d->irq == IRQ_RTCAlrm) {
 296                 mask = PWER_RTC;
 297                 goto set_pwer;
 298         }
 299
 300         return -EINVAL;
 301
 302 set_pwer:
 303         if (on)
 304                 PWER |= mask;
 305         else
 306                 PWER &=~mask;
 307
 308         return 0;
 309 }
 310
 311 void __init pxa25x_init_irq(void)
 312 {
 313         pxa_init_irq(32, pxa25x_set_wake);
 314         pxa_init_gpio(IRQ_GPIO_2_x, 2, 84, pxa25x_set_wake);
 315 }
 316
 317 #ifdef CONFIG_CPU_PXA26x
 318 void __init pxa26x_init_irq(void)
 319 {
 320         pxa_init_irq(32, pxa25x_set_wake);
 321         pxa_init_gpio(IRQ_GPIO_2_x, 2, 89, pxa25x_set_wake);
 322 }
 323 #endif
 324
 325 static struct map_desc pxa25x_io_desc[] __initdata = {
 326         {       /* Mem Ctl */
 327                 .virtual        = SMEMC_VIRT,
 328                 .pfn            = __phys_to_pfn(PXA2XX_SMEMC_BASE),
 329                 .length         = 0x00200000,
 330                 .type           = MT_DEVICE
 331         },
 332 };
 333
 334 void __init pxa25x_map_io(void)
 335 {
 336         pxa_map_io();
 337         iotable_init(ARRAY_AND_SIZE(pxa25x_io_desc));
 338         pxa25x_get_clk_frequency_khz(1);
 339 }
 340
 341 static struct platform_device *pxa25x_devices[] __initdata = {
 342         &pxa25x_device_udc,
 343         &pxa_device_pmu,
 344         &pxa_device_i2s,
 345         &sa1100_device_rtc,
 346         &pxa25x_device_ssp,
 347         &pxa25x_device_nssp,
 348         &pxa25x_device_assp,
 349         &pxa25x_device_pwm0,
 350         &pxa25x_device_pwm1,
 351         &pxa_device_asoc_platform,
 352 };
 353
 354 static int __init pxa25x_init(void)
 355 {
 356         int ret = 0;
 357
 358         if (cpu_is_pxa25x()) {
 359
 360                 reset_status = RCSR;
 361
 362                 clkdev_add_table(pxa25x_clkregs, ARRAY_SIZE(pxa25x_clkregs));
 363
 364                 if ((ret = pxa_init_dma(IRQ_DMA, 16)))
 365                         return ret;
 366
 367                 pxa25x_init_pm();
 368
 369                 register_syscore_ops(&pxa_irq_syscore_ops);
 370                 register_syscore_ops(&pxa2xx_mfp_syscore_ops);
 371                 register_syscore_ops(&pxa_gpio_syscore_ops);
 372                 register_syscore_ops(&pxa2xx_clock_syscore_ops);
 373
 374                 ret = platform_add_devices(pxa25x_devices,
 375                                            ARRAY_SIZE(pxa25x_devices));
 376                 if (ret)
 377                         return ret;
 378         }
 379
 380         /* Only add HWUART for PXA255/26x; PXA210/250 do not have it. */
 381         if (cpu_is_pxa255())
 382                 clkdev_add(&pxa25x_hwuart_clkreg);
 383
 384         return ret;
 385 }
 386
 387 postcore_initcall(pxa25x_init);