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/pxa-regs.h>
  29 #include <mach/pxa2xx-regs.h>
  30 #include <mach/mfp-pxa25x.h>
  31 #include <mach/reset.h>
  32 #include <mach/pm.h>
  33 #include <mach/dma.h>
  34
  35 #include "generic.h"
  36 #include "devices.h"
  37 #include "clock.h"
  38
  39 /*
  40  * Various clock factors driven by the CCCR register.
  41  */
  42
  43 /* Crystal Frequency to Memory Frequency Multiplier (L) */
  44 static unsigned char L_clk_mult[32] = { 0, 27, 32, 36, 40, 45, 0, };
  45
  46 /* Memory Frequency to Run Mode Frequency Multiplier (M) */
  47 static unsigned char M_clk_mult[4] = { 0, 1, 2, 4 };
  48
  49 /* Run Mode Frequency to Turbo Mode Frequency Multiplier (N) */
  50 /* Note: we store the value N * 2 here. */
  51 static unsigned char N2_clk_mult[8] = { 0, 0, 2, 3, 4, 0, 6, 0 };
  52
  53 /* Crystal clock */
  54 #define BASE_CLK        3686400
  55
  56 /*
  57  * Get the clock frequency as reflected by CCCR and the turbo flag.
  58  * We assume these values have been applied via a fcs.
  59  * If info is not 0 we also display the current settings.
  60  */
  61 unsigned int pxa25x_get_clk_frequency_khz(int info)
  62 {
  63         unsigned long cccr, turbo;
  64         unsigned int l, L, m, M, n2, N;
  65
  66         cccr = CCCR;
  67         asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (turbo) );
  68
  69         l  =  L_clk_mult[(cccr >> 0) & 0x1f];
  70         m  =  M_clk_mult[(cccr >> 5) & 0x03];
  71         n2 = N2_clk_mult[(cccr >> 7) & 0x07];
  72
  73         L = l * BASE_CLK;
  74         M = m * L;
  75         N = n2 * M / 2;
  76
  77         if(info)
  78         {
  79                 L += 5000;
  80                 printk( KERN_INFO "Memory clock: %d.%02dMHz (*%d)\n",
  81                         L / 1000000, (L % 1000000) / 10000, l );
  82                 M += 5000;
  83                 printk( KERN_INFO "Run Mode clock: %d.%02dMHz (*%d)\n",
  84                         M / 1000000, (M % 1000000) / 10000, m );
  85                 N += 5000;
  86                 printk( KERN_INFO "Turbo Mode clock: %d.%02dMHz (*%d.%d, %sactive)\n",
  87                         N / 1000000, (N % 1000000) / 10000, n2 / 2, (n2 % 2) * 5,
  88                         (turbo & 1) ? "" : "in" );
  89         }
  90
  91         return (turbo & 1) ? (N/1000) : (M/1000);
  92 }
  93
  94 /*
  95  * Return the current memory clock frequency in units of 10kHz
  96  */
  97 unsigned int pxa25x_get_memclk_frequency_10khz(void)
  98 {
  99         return L_clk_mult[(CCCR >> 0) & 0x1f] * BASE_CLK / 10000;
 100 }
 101
 102 static unsigned long clk_pxa25x_lcd_getrate(struct clk *clk)
 103 {
 104         return pxa25x_get_memclk_frequency_10khz() * 10000;
 105 }
 106
 107 static const struct clkops clk_pxa25x_lcd_ops = {
 108         .enable         = clk_cken_enable,
 109         .disable        = clk_cken_disable,
 110         .getrate        = clk_pxa25x_lcd_getrate,
 111 };
 112
 113 static unsigned long gpio12_config_32k[] = {
 114         GPIO12_32KHz,
 115 };
 116
 117 static unsigned long gpio12_config_gpio[] = {
 118         GPIO12_GPIO,
 119 };
 120
 121 static void clk_gpio12_enable(struct clk *clk)
 122 {
 123         pxa2xx_mfp_config(gpio12_config_32k, 1);
 124 }
 125
 126 static void clk_gpio12_disable(struct clk *clk)
 127 {
 128         pxa2xx_mfp_config(gpio12_config_gpio, 1);
 129 }
 130
 131 static const struct clkops clk_pxa25x_gpio12_ops = {
 132         .enable         = clk_gpio12_enable,
 133         .disable        = clk_gpio12_disable,
 134 };
 135
 136 static unsigned long gpio11_config_3m6[] = {
 137         GPIO11_3_6MHz,
 138 };
 139
 140 static unsigned long gpio11_config_gpio[] = {
 141         GPIO11_GPIO,
 142 };
 143
 144 static void clk_gpio11_enable(struct clk *clk)
 145 {
 146         pxa2xx_mfp_config(gpio11_config_3m6, 1);
 147 }
 148
 149 static void clk_gpio11_disable(struct clk *clk)
 150 {
 151         pxa2xx_mfp_config(gpio11_config_gpio, 1);
 152 }
 153
 154 static const struct clkops clk_pxa25x_gpio11_ops = {
 155         .enable         = clk_gpio11_enable,
 156         .disable        = clk_gpio11_disable,
 157 };
 158
 159 /*
 160  * 3.6864MHz -> OST, GPIO, SSP, PWM, PLLs (95.842MHz, 147.456MHz)
 161  * 95.842MHz -> MMC 19.169MHz, I2C 31.949MHz, FICP 47.923MHz, USB 47.923MHz
 162  * 147.456MHz -> UART 14.7456MHz, AC97 12.288MHz, I2S 5.672MHz (allegedly)
 163  */
 164 static struct clk pxa25x_hwuart_clk =
 165         INIT_CKEN("UARTCLK", HWUART, 14745600, 1, &pxa_device_hwuart.dev)
 166 ;
 167
 168 /*
 169  * PXA 2xx clock declarations.
 170  */
 171 static struct clk pxa25x_clks[] = {
 172         INIT_CK("LCDCLK", LCD, &clk_pxa25x_lcd_ops, &pxa_device_fb.dev),
 173         INIT_CKEN("UARTCLK", FFUART, 14745600, 1, &pxa_device_ffuart.dev),
 174         INIT_CKEN("UARTCLK", BTUART, 14745600, 1, &pxa_device_btuart.dev),
 175         INIT_CKEN("UARTCLK", STUART, 14745600, 1, NULL),
 176         INIT_CKEN("UDCCLK", USB, 47923000, 5, &pxa25x_device_udc.dev),
 177         INIT_CLK("GPIO11_CLK", &clk_pxa25x_gpio11_ops, 3686400, 0, NULL),
 178         INIT_CLK("GPIO12_CLK", &clk_pxa25x_gpio12_ops, 32768, 0, NULL),
 179         INIT_CKEN("MMCCLK", MMC, 19169000, 0, &pxa_device_mci.dev),
 180         INIT_CKEN("I2CCLK", I2C, 31949000, 0, &pxa_device_i2c.dev),
 181
 182         INIT_CKEN("SSPCLK",  SSP, 3686400, 0, &pxa25x_device_ssp.dev),
 183         INIT_CKEN("SSPCLK", NSSP, 3686400, 0, &pxa25x_device_nssp.dev),
 184         INIT_CKEN("SSPCLK", ASSP, 3686400, 0, &pxa25x_device_assp.dev),
 185         INIT_CKEN("PWMCLK", PWM0, 3686400, 0, &pxa25x_device_pwm0.dev),
 186         INIT_CKEN("PWMCLK", PWM1, 3686400, 0, &pxa25x_device_pwm1.dev),
 187
 188         INIT_CKEN("AC97CLK",     AC97,     24576000, 0, NULL),
 189
 190         /*
 191         INIT_CKEN("I2SCLK",  I2S,  14745600, 0, NULL),
 192         */
 193         INIT_CKEN("FICPCLK", FICP, 47923000, 0, NULL),
 194 };
 195
 196 #ifdef CONFIG_PM
 197
 198 #define SAVE(x)         sleep_save[SLEEP_SAVE_##x] = x
 199 #define RESTORE(x)      x = sleep_save[SLEEP_SAVE_##x]
 200
 201 /*
 202  * List of global PXA peripheral registers to preserve.
 203  * More ones like CP and general purpose register values are preserved
 204  * with the stack pointer in sleep.S.
 205  */
 206 enum {
 207         SLEEP_SAVE_PSTR,
 208         SLEEP_SAVE_CKEN,
 209         SLEEP_SAVE_COUNT
 210 };
 211
 212
 213 static void pxa25x_cpu_pm_save(unsigned long *sleep_save)
 214 {
 215         SAVE(CKEN);
 216         SAVE(PSTR);
 217 }
 218
 219 static void pxa25x_cpu_pm_restore(unsigned long *sleep_save)
 220 {
 221         /* ensure not to come back here if it wasn't intended */
 222         PSPR = 0;
 223
 224         RESTORE(CKEN);
 225         RESTORE(PSTR);
 226 }
 227
 228 static void pxa25x_cpu_pm_enter(suspend_state_t state)
 229 {
 230         /* Clear reset status */
 231         RCSR = RCSR_HWR | RCSR_WDR | RCSR_SMR | RCSR_GPR;
 232
 233         switch (state) {
 234         case PM_SUSPEND_MEM:
 235                 /* set resume return address */
 236                 PSPR = virt_to_phys(pxa_cpu_resume);
 237                 pxa25x_cpu_suspend(PWRMODE_SLEEP);
 238                 break;
 239         }
 240 }
 241
 242 static struct pxa_cpu_pm_fns pxa25x_cpu_pm_fns = {
 243         .save_count     = SLEEP_SAVE_COUNT,
 244         .valid          = suspend_valid_only_mem,
 245         .save           = pxa25x_cpu_pm_save,
 246         .restore        = pxa25x_cpu_pm_restore,
 247         .enter          = pxa25x_cpu_pm_enter,
 248 };
 249
 250 static void __init pxa25x_init_pm(void)
 251 {
 252         pxa_cpu_pm_fns = &pxa25x_cpu_pm_fns;
 253 }
 254 #else
 255 static inline void pxa25x_init_pm(void) {}
 256 #endif
 257
 258 /* PXA25x: supports wakeup from GPIO0..GPIO15 and RTC alarm
 259  */
 260
 261 static int pxa25x_set_wake(unsigned int irq, unsigned int on)
 262 {
 263         int gpio = IRQ_TO_GPIO(irq);
 264         uint32_t mask = 0;
 265
 266         if (gpio >= 0 && gpio < 85)
 267                 return gpio_set_wake(gpio, on);
 268
 269         if (irq == IRQ_RTCAlrm) {
 270                 mask = PWER_RTC;
 271                 goto set_pwer;
 272         }
 273
 274         return -EINVAL;
 275
 276 set_pwer:
 277         if (on)
 278                 PWER |= mask;
 279         else
 280                 PWER &=~mask;
 281
 282         return 0;
 283 }
 284
 285 void __init pxa25x_init_irq(void)
 286 {
 287         pxa_init_irq(32, pxa25x_set_wake);
 288         pxa_init_gpio(85, pxa25x_set_wake);
 289 }
 290
 291 static struct platform_device *pxa25x_devices[] __initdata = {
 292         &pxa25x_device_udc,
 293         &pxa_device_ffuart,
 294         &pxa_device_btuart,
 295         &pxa_device_stuart,
 296         &pxa_device_i2s,
 297         &pxa_device_rtc,
 298         &pxa25x_device_ssp,
 299         &pxa25x_device_nssp,
 300         &pxa25x_device_assp,
 301         &pxa25x_device_pwm0,
 302         &pxa25x_device_pwm1,
 303 };
 304
 305 static struct sys_device pxa25x_sysdev[] = {
 306         {
 307                 .cls    = &pxa_irq_sysclass,
 308         }, {
 309                 .cls    = &pxa2xx_mfp_sysclass,
 310         }, {
 311                 .cls    = &pxa_gpio_sysclass,
 312         },
 313 };
 314
 315 static int __init pxa25x_init(void)
 316 {
 317         int i, ret = 0;
 318
 319         /* Only add HWUART for PXA255/26x; PXA210/250/27x do not have it. */
 320         if (cpu_is_pxa255())
 321                 clks_register(&pxa25x_hwuart_clk, 1);
 322
 323         if (cpu_is_pxa21x() || cpu_is_pxa25x()) {
 324
 325                 reset_status = RCSR;
 326
 327                 clks_register(pxa25x_clks, ARRAY_SIZE(pxa25x_clks));
 328
 329                 if ((ret = pxa_init_dma(16)))
 330                         return ret;
 331
 332                 pxa25x_init_pm();
 333
 334                 for (i = 0; i < ARRAY_SIZE(pxa25x_sysdev); i++) {
 335                         ret = sysdev_register(&pxa25x_sysdev[i]);
 336                         if (ret)
 337                                 pr_err("failed to register sysdev[%d]\n", i);
 338                 }
 339
 340                 ret = platform_add_devices(pxa25x_devices,
 341                                            ARRAY_SIZE(pxa25x_devices));
 342                 if (ret)
 343                         return ret;
 344         }
 345
 346         /* Only add HWUART for PXA255/26x; PXA210/250/27x do not have it. */
 347         if (cpu_is_pxa255())
 348                 ret = platform_device_register(&pxa_device_hwuart);
 349
 350         return ret;
 351 }
 352
 353 postcore_initcall(pxa25x_init);