arch/arm/mach-pxa/pxa27x.c

   1 /*
   2  *  linux/arch/arm/mach-pxa/pxa27x.c
   3  *
   4  *  Author:     Nicolas Pitre
   5  *  Created:    Nov 05, 2002
   6  *  Copyright:  MontaVista Software Inc.
   7  *
   8  * Code specific to PXA27x aka Bulverde.
   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 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/init.h>
  17 #include <linux/suspend.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/sysdev.h>
  20
  21 #include <mach/hardware.h>
  22 #include <asm/irq.h>
  23 #include <mach/irqs.h>
  24 #include <mach/gpio.h>
  25 #include <mach/pxa27x.h>
  26 #include <mach/reset.h>
  27 #include <mach/ohci.h>
  28 #include <mach/pm.h>
  29 #include <mach/dma.h>
  30 #include <mach/i2c.h>
  31
  32 #include "generic.h"
  33 #include "devices.h"
  34 #include "clock.h"
  35
  36 void pxa27x_clear_otgph(void)
  37 {
  38         if (cpu_is_pxa27x() && (PSSR & PSSR_OTGPH))
  39                 PSSR |= PSSR_OTGPH;
  40 }
  41 EXPORT_SYMBOL(pxa27x_clear_otgph);
  42
  43 /* Crystal clock: 13MHz */
  44 #define BASE_CLK        13000000
  45
  46 /*
  47  * Get the clock frequency as reflected by CCSR and the turbo flag.
  48  * We assume these values have been applied via a fcs.
  49  * If info is not 0 we also display the current settings.
  50  */
  51 unsigned int pxa27x_get_clk_frequency_khz(int info)
  52 {
  53         unsigned long ccsr, clkcfg;
  54         unsigned int l, L, m, M, n2, N, S;
  55         int cccr_a, t, ht, b;
  56
  57         ccsr = CCSR;
  58         cccr_a = CCCR & (1 << 25);
  59
  60         /* Read clkcfg register: it has turbo, b, half-turbo (and f) */
  61         asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg) );
  62         t  = clkcfg & (1 << 0);
  63         ht = clkcfg & (1 << 2);
  64         b  = clkcfg & (1 << 3);
  65
  66         l  = ccsr & 0x1f;
  67         n2 = (ccsr>>7) & 0xf;
  68         m  = (l <= 10) ? 1 : (l <= 20) ? 2 : 4;
  69
  70         L  = l * BASE_CLK;
  71         N  = (L * n2) / 2;
  72         M  = (!cccr_a) ? (L/m) : ((b) ? L : (L/2));
  73         S  = (b) ? L : (L/2);
  74
  75         if (info) {
  76                 printk( KERN_INFO "Run Mode clock: %d.%02dMHz (*%d)\n",
  77                         L / 1000000, (L % 1000000) / 10000, l );
  78                 printk( KERN_INFO "Turbo Mode clock: %d.%02dMHz (*%d.%d, %sactive)\n",
  79                         N / 1000000, (N % 1000000)/10000, n2 / 2, (n2 % 2)*5,
  80                         (t) ? "" : "in" );
  81                 printk( KERN_INFO "Memory clock: %d.%02dMHz (/%d)\n",
  82                         M / 1000000, (M % 1000000) / 10000, m );
  83                 printk( KERN_INFO "System bus clock: %d.%02dMHz \n",
  84                         S / 1000000, (S % 1000000) / 10000 );
  85         }
  86
  87         return (t) ? (N/1000) : (L/1000);
  88 }
  89
  90 /*
  91  * Return the current mem clock frequency in units of 10kHz as
  92  * reflected by CCCR[A], B, and L
  93  */
  94 unsigned int pxa27x_get_memclk_frequency_10khz(void)
  95 {
  96         unsigned long ccsr, clkcfg;
  97         unsigned int l, L, m, M;
  98         int cccr_a, b;
  99
 100         ccsr = CCSR;
 101         cccr_a = CCCR & (1 << 25);
 102
 103         /* Read clkcfg register: it has turbo, b, half-turbo (and f) */
 104         asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg) );
 105         b = clkcfg & (1 << 3);
 106
 107         l = ccsr & 0x1f;
 108         m = (l <= 10) ? 1 : (l <= 20) ? 2 : 4;
 109
 110         L = l * BASE_CLK;
 111         M = (!cccr_a) ? (L/m) : ((b) ? L : (L/2));
 112
 113         return (M / 10000);
 114 }
 115
 116 /*
 117  * Return the current LCD clock frequency in units of 10kHz as
 118  */
 119 static unsigned int pxa27x_get_lcdclk_frequency_10khz(void)
 120 {
 121         unsigned long ccsr;
 122         unsigned int l, L, k, K;
 123
 124         ccsr = CCSR;
 125
 126         l = ccsr & 0x1f;
 127         k = (l <= 7) ? 1 : (l <= 16) ? 2 : 4;
 128
 129         L = l * BASE_CLK;
 130         K = L / k;
 131
 132         return (K / 10000);
 133 }
 134
 135 static unsigned long clk_pxa27x_lcd_getrate(struct clk *clk)
 136 {
 137         return pxa27x_get_lcdclk_frequency_10khz() * 10000;
 138 }
 139
 140 static const struct clkops clk_pxa27x_lcd_ops = {
 141         .enable         = clk_cken_enable,
 142         .disable        = clk_cken_disable,
 143         .getrate        = clk_pxa27x_lcd_getrate,
 144 };
 145
 146 static DEFINE_CK(pxa27x_lcd, LCD, &clk_pxa27x_lcd_ops);
 147 static DEFINE_CK(pxa27x_camera, CAMERA, &clk_pxa27x_lcd_ops);
 148 static DEFINE_CKEN(pxa27x_ffuart, FFUART, 14857000, 1);
 149 static DEFINE_CKEN(pxa27x_btuart, BTUART, 14857000, 1);
 150 static DEFINE_CKEN(pxa27x_stuart, STUART, 14857000, 1);
 151 static DEFINE_CKEN(pxa27x_i2s, I2S, 14682000, 0);
 152 static DEFINE_CKEN(pxa27x_i2c, I2C, 32842000, 0);
 153 static DEFINE_CKEN(pxa27x_usb, USB, 48000000, 5);
 154 static DEFINE_CKEN(pxa27x_mmc, MMC, 19500000, 0);
 155 static DEFINE_CKEN(pxa27x_ficp, FICP, 48000000, 0);
 156 static DEFINE_CKEN(pxa27x_usbhost, USBHOST, 48000000, 0);
 157 static DEFINE_CKEN(pxa27x_pwri2c, PWRI2C, 13000000, 0);
 158 static DEFINE_CKEN(pxa27x_keypad, KEYPAD, 32768, 0);
 159 static DEFINE_CKEN(pxa27x_ssp1, SSP1, 13000000, 0);
 160 static DEFINE_CKEN(pxa27x_ssp2, SSP2, 13000000, 0);
 161 static DEFINE_CKEN(pxa27x_ssp3, SSP3, 13000000, 0);
 162 static DEFINE_CKEN(pxa27x_pwm0, PWM0, 13000000, 0);
 163 static DEFINE_CKEN(pxa27x_pwm1, PWM1, 13000000, 0);
 164 static DEFINE_CKEN(pxa27x_ac97, AC97, 24576000, 0);
 165 static DEFINE_CKEN(pxa27x_ac97conf, AC97CONF, 24576000, 0);
 166 static DEFINE_CKEN(pxa27x_msl, MSL, 48000000, 0);
 167 static DEFINE_CKEN(pxa27x_usim, USIM, 48000000, 0);
 168 static DEFINE_CKEN(pxa27x_memstk, MEMSTK, 19500000, 0);
 169 static DEFINE_CKEN(pxa27x_im, IM, 0, 0);
 170 static DEFINE_CKEN(pxa27x_memc, MEMC, 0, 0);
 171
 172 static struct clk_lookup pxa27x_clkregs[] = {
 173         INIT_CLKREG(&clk_pxa27x_lcd, "pxa2xx-fb", NULL),
 174         INIT_CLKREG(&clk_pxa27x_camera, "pxa27x-camera.0", NULL),
 175         INIT_CLKREG(&clk_pxa27x_ffuart, "pxa2xx-uart.0", NULL),
 176         INIT_CLKREG(&clk_pxa27x_btuart, "pxa2xx-uart.1", NULL),
 177         INIT_CLKREG(&clk_pxa27x_stuart, "pxa2xx-uart.2", NULL),
 178         INIT_CLKREG(&clk_pxa27x_i2s, "pxa2xx-i2s", NULL),
 179         INIT_CLKREG(&clk_pxa27x_i2c, "pxa2xx-i2c.0", NULL),
 180         INIT_CLKREG(&clk_pxa27x_usb, "pxa27x-udc", NULL),
 181         INIT_CLKREG(&clk_pxa27x_mmc, "pxa2xx-mci.0", NULL),
 182         INIT_CLKREG(&clk_pxa27x_stuart, "pxa2xx-ir", "UARTCLK"),
 183         INIT_CLKREG(&clk_pxa27x_ficp, "pxa2xx-ir", "FICPCLK"),
 184         INIT_CLKREG(&clk_pxa27x_usbhost, "pxa27x-ohci", NULL),
 185         INIT_CLKREG(&clk_pxa27x_pwri2c, "pxa2xx-i2c.1", NULL),
 186         INIT_CLKREG(&clk_pxa27x_keypad, "pxa27x-keypad", NULL),
 187         INIT_CLKREG(&clk_pxa27x_ssp1, "pxa27x-ssp.0", NULL),
 188         INIT_CLKREG(&clk_pxa27x_ssp2, "pxa27x-ssp.1", NULL),
 189         INIT_CLKREG(&clk_pxa27x_ssp3, "pxa27x-ssp.2", NULL),
 190         INIT_CLKREG(&clk_pxa27x_pwm0, "pxa27x-pwm.0", NULL),
 191         INIT_CLKREG(&clk_pxa27x_pwm1, "pxa27x-pwm.1", NULL),
 192         INIT_CLKREG(&clk_pxa27x_ac97, NULL, "AC97CLK"),
 193         INIT_CLKREG(&clk_pxa27x_ac97conf, NULL, "AC97CONFCLK"),
 194         INIT_CLKREG(&clk_pxa27x_msl, NULL, "MSLCLK"),
 195         INIT_CLKREG(&clk_pxa27x_usim, NULL, "USIMCLK"),
 196         INIT_CLKREG(&clk_pxa27x_memstk, NULL, "MSTKCLK"),
 197         INIT_CLKREG(&clk_pxa27x_im, NULL, "IMCLK"),
 198         INIT_CLKREG(&clk_pxa27x_memc, NULL, "MEMCLK"),
 199 };
 200
 201 #ifdef CONFIG_PM
 202
 203 #define SAVE(x)         sleep_save[SLEEP_SAVE_##x] = x
 204 #define RESTORE(x)      x = sleep_save[SLEEP_SAVE_##x]
 205
 206 /*
 207  * List of global PXA peripheral registers to preserve.
 208  * More ones like CP and general purpose register values are preserved
 209  * with the stack pointer in sleep.S.
 210  */
 211 enum {
 212         SLEEP_SAVE_PSTR,
 213         SLEEP_SAVE_CKEN,
 214         SLEEP_SAVE_MDREFR,
 215         SLEEP_SAVE_PCFR,
 216         SLEEP_SAVE_COUNT
 217 };
 218
 219 void pxa27x_cpu_pm_save(unsigned long *sleep_save)
 220 {
 221         SAVE(MDREFR);
 222         SAVE(PCFR);
 223
 224         SAVE(CKEN);
 225         SAVE(PSTR);
 226 }
 227
 228 void pxa27x_cpu_pm_restore(unsigned long *sleep_save)
 229 {
 230         RESTORE(MDREFR);
 231         RESTORE(PCFR);
 232
 233         PSSR = PSSR_RDH | PSSR_PH;
 234
 235         RESTORE(CKEN);
 236         RESTORE(PSTR);
 237 }
 238
 239 void pxa27x_cpu_pm_enter(suspend_state_t state)
 240 {
 241         extern void pxa_cpu_standby(void);
 242
 243         /* ensure voltage-change sequencer not initiated, which hangs */
 244         PCFR &= ~PCFR_FVC;
 245
 246         /* Clear edge-detect status register. */
 247         PEDR = 0xDF12FE1B;
 248
 249         /* Clear reset status */
 250         RCSR = RCSR_HWR | RCSR_WDR | RCSR_SMR | RCSR_GPR;
 251
 252         switch (state) {
 253         case PM_SUSPEND_STANDBY:
 254                 pxa_cpu_standby();
 255                 break;
 256         case PM_SUSPEND_MEM:
 257                 pxa27x_cpu_suspend(PWRMODE_SLEEP);
 258                 break;
 259         }
 260 }
 261
 262 static int pxa27x_cpu_pm_valid(suspend_state_t state)
 263 {
 264         return state == PM_SUSPEND_MEM || state == PM_SUSPEND_STANDBY;
 265 }
 266
 267 static int pxa27x_cpu_pm_prepare(void)
 268 {
 269         /* set resume return address */
 270         PSPR = virt_to_phys(pxa_cpu_resume);
 271         return 0;
 272 }
 273
 274 static void pxa27x_cpu_pm_finish(void)
 275 {
 276         /* ensure not to come back here if it wasn't intended */
 277         PSPR = 0;
 278 }
 279
 280 static struct pxa_cpu_pm_fns pxa27x_cpu_pm_fns = {
 281         .save_count     = SLEEP_SAVE_COUNT,
 282         .save           = pxa27x_cpu_pm_save,
 283         .restore        = pxa27x_cpu_pm_restore,
 284         .valid          = pxa27x_cpu_pm_valid,
 285         .enter          = pxa27x_cpu_pm_enter,
 286         .prepare        = pxa27x_cpu_pm_prepare,
 287         .finish         = pxa27x_cpu_pm_finish,
 288 };
 289
 290 static void __init pxa27x_init_pm(void)
 291 {
 292         pxa_cpu_pm_fns = &pxa27x_cpu_pm_fns;
 293 }
 294 #else
 295 static inline void pxa27x_init_pm(void) {}
 296 #endif
 297
 298 /* PXA27x:  Various gpios can issue wakeup events.  This logic only
 299  * handles the simple cases, not the WEMUX2 and WEMUX3 options
 300  */
 301 static int pxa27x_set_wake(unsigned int irq, unsigned int on)
 302 {
 303         int gpio = IRQ_TO_GPIO(irq);
 304         uint32_t mask;
 305
 306         if (gpio >= 0 && gpio < 128)
 307                 return gpio_set_wake(gpio, on);
 308
 309         if (irq == IRQ_KEYPAD)
 310                 return keypad_set_wake(on);
 311
 312         switch (irq) {
 313         case IRQ_RTCAlrm:
 314                 mask = PWER_RTC;
 315                 break;
 316         case IRQ_USB:
 317                 mask = 1u << 26;
 318                 break;
 319         default:
 320                 return -EINVAL;
 321         }
 322
 323         if (on)
 324                 PWER |= mask;
 325         else
 326                 PWER &=~mask;
 327
 328         return 0;
 329 }
 330
 331 void __init pxa27x_init_irq(void)
 332 {
 333         pxa_init_irq(34, pxa27x_set_wake);
 334         pxa_init_gpio(IRQ_GPIO_2_x, 2, 120, pxa27x_set_wake);
 335 }
 336
 337 /*
 338  * device registration specific to PXA27x.
 339  */
 340 void __init pxa27x_set_i2c_power_info(struct i2c_pxa_platform_data *info)
 341 {
 342         local_irq_disable();
 343         PCFR |= PCFR_PI2CEN;
 344         local_irq_enable();
 345         pxa_register_device(&pxa27x_device_i2c_power, info);
 346 }
 347
 348 static struct platform_device *devices[] __initdata = {
 349         &pxa27x_device_udc,
 350         &pxa_device_ffuart,
 351         &pxa_device_btuart,
 352         &pxa_device_stuart,
 353         &pxa_device_i2s,
 354         &sa1100_device_rtc,
 355         &pxa_device_rtc,
 356         &pxa27x_device_ssp1,
 357         &pxa27x_device_ssp2,
 358         &pxa27x_device_ssp3,
 359         &pxa27x_device_pwm0,
 360         &pxa27x_device_pwm1,
 361 };
 362
 363 static struct sys_device pxa27x_sysdev[] = {
 364         {
 365                 .cls    = &pxa_irq_sysclass,
 366         }, {
 367                 .cls    = &pxa2xx_mfp_sysclass,
 368         }, {
 369                 .cls    = &pxa_gpio_sysclass,
 370         },
 371 };
 372
 373 static int __init pxa27x_init(void)
 374 {
 375         int i, ret = 0;
 376
 377         if (cpu_is_pxa27x()) {
 378
 379                 reset_status = RCSR;
 380
 381                 clks_register(pxa27x_clkregs, ARRAY_SIZE(pxa27x_clkregs));
 382
 383                 if ((ret = pxa_init_dma(IRQ_DMA, 32)))
 384                         return ret;
 385
 386                 pxa27x_init_pm();
 387
 388                 for (i = 0; i < ARRAY_SIZE(pxa27x_sysdev); i++) {
 389                         ret = sysdev_register(&pxa27x_sysdev[i]);
 390                         if (ret)
 391                                 pr_err("failed to register sysdev[%d]\n", i);
 392                 }
 393
 394                 ret = platform_add_devices(devices, ARRAY_SIZE(devices));
 395         }
 396
 397         return ret;
 398 }
 399
 400 postcore_initcall(pxa27x_init);