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/gpio.h>
  15 #include <linux/gpio-pxa.h>
  16 #include <linux/module.h>
  17 #include <linux/kernel.h>
  18 #include <linux/init.h>
  19 #include <linux/suspend.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/syscore_ops.h>
  22 #include <linux/io.h>
  23 #include <linux/irq.h>
  24 #include <linux/i2c/pxa-i2c.h>
  25
  26 #include <asm/mach/map.h>
  27 #include <mach/hardware.h>
  28 #include <asm/irq.h>
  29 #include <asm/suspend.h>
  30 #include <mach/irqs.h>
  31 #include <mach/pxa27x.h>
  32 #include <mach/reset.h>
  33 #include <linux/platform_data/usb-ohci-pxa27x.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 void pxa27x_clear_otgph(void)
  43 {
  44         if (cpu_is_pxa27x() && (PSSR & PSSR_OTGPH))
  45                 PSSR |= PSSR_OTGPH;
  46 }
  47 EXPORT_SYMBOL(pxa27x_clear_otgph);
  48
  49 static unsigned long ac97_reset_config[] = {
  50         GPIO113_AC97_nRESET_GPIO_HIGH,
  51         GPIO113_AC97_nRESET,
  52         GPIO95_AC97_nRESET_GPIO_HIGH,
  53         GPIO95_AC97_nRESET,
  54 };
  55
  56 void pxa27x_configure_ac97reset(int reset_gpio, bool to_gpio)
  57 {
  58         /*
  59          * This helper function is used to work around a bug in the pxa27x's
  60          * ac97 controller during a warm reset.  The configuration of the
  61          * reset_gpio is changed as follows:
  62          * to_gpio == true: configured to generic output gpio and driven high
  63          * to_gpio == false: configured to ac97 controller alt fn AC97_nRESET
  64          */
  65
  66         if (reset_gpio == 113)
  67                 pxa2xx_mfp_config(to_gpio ? &ac97_reset_config[0] :
  68                                   &ac97_reset_config[1], 1);
  69
  70         if (reset_gpio == 95)
  71                 pxa2xx_mfp_config(to_gpio ? &ac97_reset_config[2] :
  72                                   &ac97_reset_config[3], 1);
  73 }
  74 EXPORT_SYMBOL_GPL(pxa27x_configure_ac97reset);
  75
  76 /* Crystal clock: 13MHz */
  77 #define BASE_CLK        13000000
  78
  79 /*
  80  * Get the clock frequency as reflected by CCSR and the turbo flag.
  81  * We assume these values have been applied via a fcs.
  82  * If info is not 0 we also display the current settings.
  83  */
  84 unsigned int pxa27x_get_clk_frequency_khz(int info)
  85 {
  86         unsigned long ccsr, clkcfg;
  87         unsigned int l, L, m, M, n2, N, S;
  88         int cccr_a, t, ht, b;
  89
  90         ccsr = CCSR;
  91         cccr_a = CCCR & (1 << 25);
  92
  93         /* Read clkcfg register: it has turbo, b, half-turbo (and f) */
  94         asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg) );
  95         t  = clkcfg & (1 << 0);
  96         ht = clkcfg & (1 << 2);
  97         b  = clkcfg & (1 << 3);
  98
  99         l  = ccsr & 0x1f;
 100         n2 = (ccsr>>7) & 0xf;
 101         m  = (l <= 10) ? 1 : (l <= 20) ? 2 : 4;
 102
 103         L  = l * BASE_CLK;
 104         N  = (L * n2) / 2;
 105         M  = (!cccr_a) ? (L/m) : ((b) ? L : (L/2));
 106         S  = (b) ? L : (L/2);
 107
 108         if (info) {
 109                 printk( KERN_INFO "Run Mode clock: %d.%02dMHz (*%d)\n",
 110                         L / 1000000, (L % 1000000) / 10000, l );
 111                 printk( KERN_INFO "Turbo Mode clock: %d.%02dMHz (*%d.%d, %sactive)\n",
 112                         N / 1000000, (N % 1000000)/10000, n2 / 2, (n2 % 2)*5,
 113                         (t) ? "" : "in" );
 114                 printk( KERN_INFO "Memory clock: %d.%02dMHz (/%d)\n",
 115                         M / 1000000, (M % 1000000) / 10000, m );
 116                 printk( KERN_INFO "System bus clock: %d.%02dMHz \n",
 117                         S / 1000000, (S % 1000000) / 10000 );
 118         }
 119
 120         return (t) ? (N/1000) : (L/1000);
 121 }
 122
 123 /*
 124  * Return the current mem clock frequency as reflected by CCCR[A], B, and L
 125  */
 126 static unsigned long clk_pxa27x_mem_getrate(struct clk *clk)
 127 {
 128         unsigned long ccsr, clkcfg;
 129         unsigned int l, L, m, M;
 130         int cccr_a, b;
 131
 132         ccsr = CCSR;
 133         cccr_a = CCCR & (1 << 25);
 134
 135         /* Read clkcfg register: it has turbo, b, half-turbo (and f) */
 136         asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg) );
 137         b = clkcfg & (1 << 3);
 138
 139         l = ccsr & 0x1f;
 140         m = (l <= 10) ? 1 : (l <= 20) ? 2 : 4;
 141
 142         L = l * BASE_CLK;
 143         M = (!cccr_a) ? (L/m) : ((b) ? L : (L/2));
 144
 145         return M;
 146 }
 147
 148 static const struct clkops clk_pxa27x_mem_ops = {
 149         .enable         = clk_dummy_enable,
 150         .disable        = clk_dummy_disable,
 151         .getrate        = clk_pxa27x_mem_getrate,
 152 };
 153
 154 /*
 155  * Return the current LCD clock frequency in units of 10kHz as
 156  */
 157 static unsigned int pxa27x_get_lcdclk_frequency_10khz(void)
 158 {
 159         unsigned long ccsr;
 160         unsigned int l, L, k, K;
 161
 162         ccsr = CCSR;
 163
 164         l = ccsr & 0x1f;
 165         k = (l <= 7) ? 1 : (l <= 16) ? 2 : 4;
 166
 167         L = l * BASE_CLK;
 168         K = L / k;
 169
 170         return (K / 10000);
 171 }
 172
 173 static unsigned long clk_pxa27x_lcd_getrate(struct clk *clk)
 174 {
 175         return pxa27x_get_lcdclk_frequency_10khz() * 10000;
 176 }
 177
 178 static const struct clkops clk_pxa27x_lcd_ops = {
 179         .enable         = clk_pxa2xx_cken_enable,
 180         .disable        = clk_pxa2xx_cken_disable,
 181         .getrate        = clk_pxa27x_lcd_getrate,
 182 };
 183
 184 static DEFINE_PXA2_CKEN(pxa27x_ffuart, FFUART, 14857000, 1);
 185 static DEFINE_PXA2_CKEN(pxa27x_btuart, BTUART, 14857000, 1);
 186 static DEFINE_PXA2_CKEN(pxa27x_stuart, STUART, 14857000, 1);
 187 static DEFINE_PXA2_CKEN(pxa27x_i2s, I2S, 14682000, 0);
 188 static DEFINE_PXA2_CKEN(pxa27x_i2c, I2C, 32842000, 0);
 189 static DEFINE_PXA2_CKEN(pxa27x_usb, USB, 48000000, 5);
 190 static DEFINE_PXA2_CKEN(pxa27x_mmc, MMC, 19500000, 0);
 191 static DEFINE_PXA2_CKEN(pxa27x_ficp, FICP, 48000000, 0);
 192 static DEFINE_PXA2_CKEN(pxa27x_usbhost, USBHOST, 48000000, 0);
 193 static DEFINE_PXA2_CKEN(pxa27x_pwri2c, PWRI2C, 13000000, 0);
 194 static DEFINE_PXA2_CKEN(pxa27x_keypad, KEYPAD, 32768, 0);
 195 static DEFINE_PXA2_CKEN(pxa27x_ssp1, SSP1, 13000000, 0);
 196 static DEFINE_PXA2_CKEN(pxa27x_ssp2, SSP2, 13000000, 0);
 197 static DEFINE_PXA2_CKEN(pxa27x_ssp3, SSP3, 13000000, 0);
 198 static DEFINE_PXA2_CKEN(pxa27x_pwm0, PWM0, 13000000, 0);
 199 static DEFINE_PXA2_CKEN(pxa27x_pwm1, PWM1, 13000000, 0);
 200 static DEFINE_PXA2_CKEN(pxa27x_ac97, AC97, 24576000, 0);
 201 static DEFINE_PXA2_CKEN(pxa27x_ac97conf, AC97CONF, 24576000, 0);
 202 static DEFINE_PXA2_CKEN(pxa27x_msl, MSL, 48000000, 0);
 203 static DEFINE_PXA2_CKEN(pxa27x_usim, USIM, 48000000, 0);
 204 static DEFINE_PXA2_CKEN(pxa27x_memstk, MEMSTK, 19500000, 0);
 205 static DEFINE_PXA2_CKEN(pxa27x_im, IM, 0, 0);
 206 static DEFINE_PXA2_CKEN(pxa27x_memc, MEMC, 0, 0);
 207
 208 static DEFINE_CK(pxa27x_lcd, LCD, &clk_pxa27x_lcd_ops);
 209 static DEFINE_CK(pxa27x_camera, CAMERA, &clk_pxa27x_lcd_ops);
 210 static DEFINE_CLK(pxa27x_mem, &clk_pxa27x_mem_ops, 0, 0);
 211
 212 static struct clk_lookup pxa27x_clkregs[] = {
 213         INIT_CLKREG(&clk_pxa27x_lcd, "pxa2xx-fb", NULL),
 214         INIT_CLKREG(&clk_pxa27x_camera, "pxa27x-camera.0", NULL),
 215         INIT_CLKREG(&clk_pxa27x_ffuart, "pxa2xx-uart.0", NULL),
 216         INIT_CLKREG(&clk_pxa27x_btuart, "pxa2xx-uart.1", NULL),
 217         INIT_CLKREG(&clk_pxa27x_stuart, "pxa2xx-uart.2", NULL),
 218         INIT_CLKREG(&clk_pxa27x_i2s, "pxa2xx-i2s", NULL),
 219         INIT_CLKREG(&clk_pxa27x_i2c, "pxa2xx-i2c.0", NULL),
 220         INIT_CLKREG(&clk_pxa27x_usb, "pxa27x-udc", NULL),
 221         INIT_CLKREG(&clk_pxa27x_mmc, "pxa2xx-mci.0", NULL),
 222         INIT_CLKREG(&clk_pxa27x_stuart, "pxa2xx-ir", "UARTCLK"),
 223         INIT_CLKREG(&clk_pxa27x_ficp, "pxa2xx-ir", "FICPCLK"),
 224         INIT_CLKREG(&clk_pxa27x_usbhost, "pxa27x-ohci", NULL),
 225         INIT_CLKREG(&clk_pxa27x_pwri2c, "pxa2xx-i2c.1", NULL),
 226         INIT_CLKREG(&clk_pxa27x_keypad, "pxa27x-keypad", NULL),
 227         INIT_CLKREG(&clk_pxa27x_ssp1, "pxa27x-ssp.0", NULL),
 228         INIT_CLKREG(&clk_pxa27x_ssp2, "pxa27x-ssp.1", NULL),
 229         INIT_CLKREG(&clk_pxa27x_ssp3, "pxa27x-ssp.2", NULL),
 230         INIT_CLKREG(&clk_pxa27x_pwm0, "pxa27x-pwm.0", NULL),
 231         INIT_CLKREG(&clk_pxa27x_pwm1, "pxa27x-pwm.1", NULL),
 232         INIT_CLKREG(&clk_pxa27x_ac97, NULL, "AC97CLK"),
 233         INIT_CLKREG(&clk_pxa27x_ac97conf, NULL, "AC97CONFCLK"),
 234         INIT_CLKREG(&clk_pxa27x_msl, NULL, "MSLCLK"),
 235         INIT_CLKREG(&clk_pxa27x_usim, NULL, "USIMCLK"),
 236         INIT_CLKREG(&clk_pxa27x_memstk, NULL, "MSTKCLK"),
 237         INIT_CLKREG(&clk_pxa27x_im, NULL, "IMCLK"),
 238         INIT_CLKREG(&clk_pxa27x_memc, NULL, "MEMCLK"),
 239         INIT_CLKREG(&clk_pxa27x_mem, "pxa2xx-pcmcia", NULL),
 240         INIT_CLKREG(&clk_dummy, "pxa27x-gpio", NULL),
 241         INIT_CLKREG(&clk_dummy, "sa1100-rtc", NULL),
 242 };
 243
 244 #ifdef CONFIG_PM
 245
 246 #define SAVE(x)         sleep_save[SLEEP_SAVE_##x] = x
 247 #define RESTORE(x)      x = sleep_save[SLEEP_SAVE_##x]
 248
 249 /*
 250  * allow platforms to override default PWRMODE setting used for PM_SUSPEND_MEM
 251  */
 252 static unsigned int pwrmode = PWRMODE_SLEEP;
 253
 254 int __init pxa27x_set_pwrmode(unsigned int mode)
 255 {
 256         switch (mode) {
 257         case PWRMODE_SLEEP:
 258         case PWRMODE_DEEPSLEEP:
 259                 pwrmode = mode;
 260                 return 0;
 261         }
 262
 263         return -EINVAL;
 264 }
 265
 266 /*
 267  * List of global PXA peripheral registers to preserve.
 268  * More ones like CP and general purpose register values are preserved
 269  * with the stack pointer in sleep.S.
 270  */
 271 enum {
 272         SLEEP_SAVE_PSTR,
 273         SLEEP_SAVE_MDREFR,
 274         SLEEP_SAVE_PCFR,
 275         SLEEP_SAVE_COUNT
 276 };
 277
 278 void pxa27x_cpu_pm_save(unsigned long *sleep_save)
 279 {
 280         sleep_save[SLEEP_SAVE_MDREFR] = __raw_readl(MDREFR);
 281         SAVE(PCFR);
 282
 283         SAVE(PSTR);
 284 }
 285
 286 void pxa27x_cpu_pm_restore(unsigned long *sleep_save)
 287 {
 288         __raw_writel(sleep_save[SLEEP_SAVE_MDREFR], MDREFR);
 289         RESTORE(PCFR);
 290
 291         PSSR = PSSR_RDH | PSSR_PH;
 292
 293         RESTORE(PSTR);
 294 }
 295
 296 void pxa27x_cpu_pm_enter(suspend_state_t state)
 297 {
 298         extern void pxa_cpu_standby(void);
 299 #ifndef CONFIG_IWMMXT
 300         u64 acc0;
 301
 302         asm volatile("mra %Q0, %R0, acc0" : "=r" (acc0));
 303 #endif
 304
 305         /* ensure voltage-change sequencer not initiated, which hangs */
 306         PCFR &= ~PCFR_FVC;
 307
 308         /* Clear edge-detect status register. */
 309         PEDR = 0xDF12FE1B;
 310
 311         /* Clear reset status */
 312         RCSR = RCSR_HWR | RCSR_WDR | RCSR_SMR | RCSR_GPR;
 313
 314         switch (state) {
 315         case PM_SUSPEND_STANDBY:
 316                 pxa_cpu_standby();
 317                 break;
 318         case PM_SUSPEND_MEM:
 319                 cpu_suspend(pwrmode, pxa27x_finish_suspend);
 320 #ifndef CONFIG_IWMMXT
 321                 asm volatile("mar acc0, %Q0, %R0" : "=r" (acc0));
 322 #endif
 323                 break;
 324         }
 325 }
 326
 327 static int pxa27x_cpu_pm_valid(suspend_state_t state)
 328 {
 329         return state == PM_SUSPEND_MEM || state == PM_SUSPEND_STANDBY;
 330 }
 331
 332 static int pxa27x_cpu_pm_prepare(void)
 333 {
 334         /* set resume return address */
 335         PSPR = virt_to_phys(cpu_resume);
 336         return 0;
 337 }
 338
 339 static void pxa27x_cpu_pm_finish(void)
 340 {
 341         /* ensure not to come back here if it wasn't intended */
 342         PSPR = 0;
 343 }
 344
 345 static struct pxa_cpu_pm_fns pxa27x_cpu_pm_fns = {
 346         .save_count     = SLEEP_SAVE_COUNT,
 347         .save           = pxa27x_cpu_pm_save,
 348         .restore        = pxa27x_cpu_pm_restore,
 349         .valid          = pxa27x_cpu_pm_valid,
 350         .enter          = pxa27x_cpu_pm_enter,
 351         .prepare        = pxa27x_cpu_pm_prepare,
 352         .finish         = pxa27x_cpu_pm_finish,
 353 };
 354
 355 static void __init pxa27x_init_pm(void)
 356 {
 357         pxa_cpu_pm_fns = &pxa27x_cpu_pm_fns;
 358 }
 359 #else
 360 static inline void pxa27x_init_pm(void) {}
 361 #endif
 362
 363 /* PXA27x:  Various gpios can issue wakeup events.  This logic only
 364  * handles the simple cases, not the WEMUX2 and WEMUX3 options
 365  */
 366 static int pxa27x_set_wake(struct irq_data *d, unsigned int on)
 367 {
 368         int gpio = pxa_irq_to_gpio(d->irq);
 369         uint32_t mask;
 370
 371         if (gpio >= 0 && gpio < 128)
 372                 return gpio_set_wake(gpio, on);
 373
 374         if (d->irq == IRQ_KEYPAD)
 375                 return keypad_set_wake(on);
 376
 377         switch (d->irq) {
 378         case IRQ_RTCAlrm:
 379                 mask = PWER_RTC;
 380                 break;
 381         case IRQ_USB:
 382                 mask = 1u << 26;
 383                 break;
 384         default:
 385                 return -EINVAL;
 386         }
 387
 388         if (on)
 389                 PWER |= mask;
 390         else
 391                 PWER &=~mask;
 392
 393         return 0;
 394 }
 395
 396 void __init pxa27x_init_irq(void)
 397 {
 398         pxa_init_irq(34, pxa27x_set_wake);
 399 }
 400
 401 void __init pxa27x_dt_init_irq(void)
 402 {
 403         if (IS_ENABLED(CONFIG_OF))
 404                 pxa_dt_irq_init(pxa27x_set_wake);
 405 }
 406
 407 static struct map_desc pxa27x_io_desc[] __initdata = {
 408         {       /* Mem Ctl */
 409                 .virtual        = (unsigned long)SMEMC_VIRT,
 410                 .pfn            = __phys_to_pfn(PXA2XX_SMEMC_BASE),
 411                 .length         = SMEMC_SIZE,
 412                 .type           = MT_DEVICE
 413         }, {    /* UNCACHED_PHYS_0 */
 414                 .virtual        = UNCACHED_PHYS_0,
 415                 .pfn            = __phys_to_pfn(0x00000000),
 416                 .length         = UNCACHED_PHYS_0_SIZE,
 417                 .type           = MT_DEVICE
 418         },
 419 };
 420
 421 void __init pxa27x_map_io(void)
 422 {
 423         pxa_map_io();
 424         iotable_init(ARRAY_AND_SIZE(pxa27x_io_desc));
 425         pxa27x_get_clk_frequency_khz(1);
 426 }
 427
 428 /*
 429  * device registration specific to PXA27x.
 430  */
 431 void __init pxa27x_set_i2c_power_info(struct i2c_pxa_platform_data *info)
 432 {
 433         local_irq_disable();
 434         PCFR |= PCFR_PI2CEN;
 435         local_irq_enable();
 436         pxa_register_device(&pxa27x_device_i2c_power, info);
 437 }
 438
 439 static struct pxa_gpio_platform_data pxa27x_gpio_info __initdata = {
 440         .irq_base       = PXA_GPIO_TO_IRQ(0),
 441         .gpio_set_wake  = gpio_set_wake,
 442 };
 443
 444 static struct platform_device *devices[] __initdata = {
 445         &pxa27x_device_udc,
 446         &pxa_device_pmu,
 447         &pxa_device_i2s,
 448         &pxa_device_asoc_ssp1,
 449         &pxa_device_asoc_ssp2,
 450         &pxa_device_asoc_ssp3,
 451         &pxa_device_asoc_platform,
 452         &sa1100_device_rtc,
 453         &pxa_device_rtc,
 454         &pxa27x_device_ssp1,
 455         &pxa27x_device_ssp2,
 456         &pxa27x_device_ssp3,
 457         &pxa27x_device_pwm0,
 458         &pxa27x_device_pwm1,
 459 };
 460
 461 static int __init pxa27x_init(void)
 462 {
 463         int ret = 0;
 464
 465         if (cpu_is_pxa27x()) {
 466
 467                 reset_status = RCSR;
 468
 469                 clkdev_add_table(pxa27x_clkregs, ARRAY_SIZE(pxa27x_clkregs));
 470
 471                 if ((ret = pxa_init_dma(IRQ_DMA, 32)))
 472                         return ret;
 473
 474                 pxa27x_init_pm();
 475
 476                 register_syscore_ops(&pxa_irq_syscore_ops);
 477                 register_syscore_ops(&pxa2xx_mfp_syscore_ops);
 478                 register_syscore_ops(&pxa2xx_clock_syscore_ops);
 479
 480                 pxa_register_device(&pxa27x_device_gpio, &pxa27x_gpio_info);
 481                 ret = platform_add_devices(devices, ARRAY_SIZE(devices));
 482         }
 483
 484         return ret;
 485 }
 486
 487 postcore_initcall(pxa27x_init);