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_GPIO, 51 GPIO113_AC97_nRESET, 52 GPIO95_GPIO, 53 GPIO95_AC97_nRESET, 54 }; 55 56 void pxa27x_assert_ac97reset(int reset_gpio, int on) 57 { 58 if (reset_gpio == 113) 59 pxa2xx_mfp_config(on ? &ac97_reset_config[0] : 60 &ac97_reset_config[1], 1); 61 62 if (reset_gpio == 95) 63 pxa2xx_mfp_config(on ? &ac97_reset_config[2] : 64 &ac97_reset_config[3], 1); 65 } 66 EXPORT_SYMBOL_GPL(pxa27x_assert_ac97reset); 67 68 /* Crystal clock: 13MHz */ 69 #define BASE_CLK 13000000 70 71 /* 72 * Get the clock frequency as reflected by CCSR and the turbo flag. 73 * We assume these values have been applied via a fcs. 74 * If info is not 0 we also display the current settings. 75 */ 76 unsigned int pxa27x_get_clk_frequency_khz(int info) 77 { 78 unsigned long ccsr, clkcfg; 79 unsigned int l, L, m, M, n2, N, S; 80 int cccr_a, t, ht, b; 81 82 ccsr = CCSR; 83 cccr_a = CCCR & (1 << 25); 84 85 /* Read clkcfg register: it has turbo, b, half-turbo (and f) */ 86 asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg) ); 87 t = clkcfg & (1 << 0); 88 ht = clkcfg & (1 << 2); 89 b = clkcfg & (1 << 3); 90 91 l = ccsr & 0x1f; 92 n2 = (ccsr>>7) & 0xf; 93 m = (l <= 10) ? 1 : (l <= 20) ? 2 : 4; 94 95 L = l * BASE_CLK; 96 N = (L * n2) / 2; 97 M = (!cccr_a) ? (L/m) : ((b) ? L : (L/2)); 98 S = (b) ? L : (L/2); 99 100 if (info) { 101 printk( KERN_INFO "Run Mode clock: %d.%02dMHz (*%d)\n", 102 L / 1000000, (L % 1000000) / 10000, l ); 103 printk( KERN_INFO "Turbo Mode clock: %d.%02dMHz (*%d.%d, %sactive)\n", 104 N / 1000000, (N % 1000000)/10000, n2 / 2, (n2 % 2)*5, 105 (t) ? "" : "in" ); 106 printk( KERN_INFO "Memory clock: %d.%02dMHz (/%d)\n", 107 M / 1000000, (M % 1000000) / 10000, m ); 108 printk( KERN_INFO "System bus clock: %d.%02dMHz \n", 109 S / 1000000, (S % 1000000) / 10000 ); 110 } 111 112 return (t) ? (N/1000) : (L/1000); 113 } 114 115 /* 116 * Return the current mem clock frequency as reflected by CCCR[A], B, and L 117 */ 118 static unsigned long clk_pxa27x_mem_getrate(struct clk *clk) 119 { 120 unsigned long ccsr, clkcfg; 121 unsigned int l, L, m, M; 122 int cccr_a, b; 123 124 ccsr = CCSR; 125 cccr_a = CCCR & (1 << 25); 126 127 /* Read clkcfg register: it has turbo, b, half-turbo (and f) */ 128 asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg) ); 129 b = clkcfg & (1 << 3); 130 131 l = ccsr & 0x1f; 132 m = (l <= 10) ? 1 : (l <= 20) ? 2 : 4; 133 134 L = l * BASE_CLK; 135 M = (!cccr_a) ? (L/m) : ((b) ? L : (L/2)); 136 137 return M; 138 } 139 140 static const struct clkops clk_pxa27x_mem_ops = { 141 .enable = clk_dummy_enable, 142 .disable = clk_dummy_disable, 143 .getrate = clk_pxa27x_mem_getrate, 144 }; 145 146 /* 147 * Return the current LCD clock frequency in units of 10kHz as 148 */ 149 static unsigned int pxa27x_get_lcdclk_frequency_10khz(void) 150 { 151 unsigned long ccsr; 152 unsigned int l, L, k, K; 153 154 ccsr = CCSR; 155 156 l = ccsr & 0x1f; 157 k = (l <= 7) ? 1 : (l <= 16) ? 2 : 4; 158 159 L = l * BASE_CLK; 160 K = L / k; 161 162 return (K / 10000); 163 } 164 165 static unsigned long clk_pxa27x_lcd_getrate(struct clk *clk) 166 { 167 return pxa27x_get_lcdclk_frequency_10khz() * 10000; 168 } 169 170 static const struct clkops clk_pxa27x_lcd_ops = { 171 .enable = clk_pxa2xx_cken_enable, 172 .disable = clk_pxa2xx_cken_disable, 173 .getrate = clk_pxa27x_lcd_getrate, 174 }; 175 176 static DEFINE_PXA2_CKEN(pxa27x_ffuart, FFUART, 14857000, 1); 177 static DEFINE_PXA2_CKEN(pxa27x_btuart, BTUART, 14857000, 1); 178 static DEFINE_PXA2_CKEN(pxa27x_stuart, STUART, 14857000, 1); 179 static DEFINE_PXA2_CKEN(pxa27x_i2s, I2S, 14682000, 0); 180 static DEFINE_PXA2_CKEN(pxa27x_i2c, I2C, 32842000, 0); 181 static DEFINE_PXA2_CKEN(pxa27x_usb, USB, 48000000, 5); 182 static DEFINE_PXA2_CKEN(pxa27x_mmc, MMC, 19500000, 0); 183 static DEFINE_PXA2_CKEN(pxa27x_ficp, FICP, 48000000, 0); 184 static DEFINE_PXA2_CKEN(pxa27x_usbhost, USBHOST, 48000000, 0); 185 static DEFINE_PXA2_CKEN(pxa27x_pwri2c, PWRI2C, 13000000, 0); 186 static DEFINE_PXA2_CKEN(pxa27x_keypad, KEYPAD, 32768, 0); 187 static DEFINE_PXA2_CKEN(pxa27x_ssp1, SSP1, 13000000, 0); 188 static DEFINE_PXA2_CKEN(pxa27x_ssp2, SSP2, 13000000, 0); 189 static DEFINE_PXA2_CKEN(pxa27x_ssp3, SSP3, 13000000, 0); 190 static DEFINE_PXA2_CKEN(pxa27x_pwm0, PWM0, 13000000, 0); 191 static DEFINE_PXA2_CKEN(pxa27x_pwm1, PWM1, 13000000, 0); 192 static DEFINE_PXA2_CKEN(pxa27x_ac97, AC97, 24576000, 0); 193 static DEFINE_PXA2_CKEN(pxa27x_ac97conf, AC97CONF, 24576000, 0); 194 static DEFINE_PXA2_CKEN(pxa27x_msl, MSL, 48000000, 0); 195 static DEFINE_PXA2_CKEN(pxa27x_usim, USIM, 48000000, 0); 196 static DEFINE_PXA2_CKEN(pxa27x_memstk, MEMSTK, 19500000, 0); 197 static DEFINE_PXA2_CKEN(pxa27x_im, IM, 0, 0); 198 static DEFINE_PXA2_CKEN(pxa27x_memc, MEMC, 0, 0); 199 200 static DEFINE_CK(pxa27x_lcd, LCD, &clk_pxa27x_lcd_ops); 201 static DEFINE_CK(pxa27x_camera, CAMERA, &clk_pxa27x_lcd_ops); 202 static DEFINE_CLK(pxa27x_mem, &clk_pxa27x_mem_ops, 0, 0); 203 204 static struct clk_lookup pxa27x_clkregs[] = { 205 INIT_CLKREG(&clk_pxa27x_lcd, "pxa2xx-fb", NULL), 206 INIT_CLKREG(&clk_pxa27x_camera, "pxa27x-camera.0", NULL), 207 INIT_CLKREG(&clk_pxa27x_ffuart, "pxa2xx-uart.0", NULL), 208 INIT_CLKREG(&clk_pxa27x_btuart, "pxa2xx-uart.1", NULL), 209 INIT_CLKREG(&clk_pxa27x_stuart, "pxa2xx-uart.2", NULL), 210 INIT_CLKREG(&clk_pxa27x_i2s, "pxa2xx-i2s", NULL), 211 INIT_CLKREG(&clk_pxa27x_i2c, "pxa2xx-i2c.0", NULL), 212 INIT_CLKREG(&clk_pxa27x_usb, "pxa27x-udc", NULL), 213 INIT_CLKREG(&clk_pxa27x_mmc, "pxa2xx-mci.0", NULL), 214 INIT_CLKREG(&clk_pxa27x_stuart, "pxa2xx-ir", "UARTCLK"), 215 INIT_CLKREG(&clk_pxa27x_ficp, "pxa2xx-ir", "FICPCLK"), 216 INIT_CLKREG(&clk_pxa27x_usbhost, "pxa27x-ohci", NULL), 217 INIT_CLKREG(&clk_pxa27x_pwri2c, "pxa2xx-i2c.1", NULL), 218 INIT_CLKREG(&clk_pxa27x_keypad, "pxa27x-keypad", NULL), 219 INIT_CLKREG(&clk_pxa27x_ssp1, "pxa27x-ssp.0", NULL), 220 INIT_CLKREG(&clk_pxa27x_ssp2, "pxa27x-ssp.1", NULL), 221 INIT_CLKREG(&clk_pxa27x_ssp3, "pxa27x-ssp.2", NULL), 222 INIT_CLKREG(&clk_pxa27x_pwm0, "pxa27x-pwm.0", NULL), 223 INIT_CLKREG(&clk_pxa27x_pwm1, "pxa27x-pwm.1", NULL), 224 INIT_CLKREG(&clk_pxa27x_ac97, NULL, "AC97CLK"), 225 INIT_CLKREG(&clk_pxa27x_ac97conf, NULL, "AC97CONFCLK"), 226 INIT_CLKREG(&clk_pxa27x_msl, NULL, "MSLCLK"), 227 INIT_CLKREG(&clk_pxa27x_usim, NULL, "USIMCLK"), 228 INIT_CLKREG(&clk_pxa27x_memstk, NULL, "MSTKCLK"), 229 INIT_CLKREG(&clk_pxa27x_im, NULL, "IMCLK"), 230 INIT_CLKREG(&clk_pxa27x_memc, NULL, "MEMCLK"), 231 INIT_CLKREG(&clk_pxa27x_mem, "pxa2xx-pcmcia", NULL), 232 INIT_CLKREG(&clk_dummy, "pxa-gpio", NULL), 233 }; 234 235 #ifdef CONFIG_PM 236 237 #define SAVE(x) sleep_save[SLEEP_SAVE_##x] = x 238 #define RESTORE(x) x = sleep_save[SLEEP_SAVE_##x] 239 240 /* 241 * allow platforms to override default PWRMODE setting used for PM_SUSPEND_MEM 242 */ 243 static unsigned int pwrmode = PWRMODE_SLEEP; 244 245 int __init pxa27x_set_pwrmode(unsigned int mode) 246 { 247 switch (mode) { 248 case PWRMODE_SLEEP: 249 case PWRMODE_DEEPSLEEP: 250 pwrmode = mode; 251 return 0; 252 } 253 254 return -EINVAL; 255 } 256 257 /* 258 * List of global PXA peripheral registers to preserve. 259 * More ones like CP and general purpose register values are preserved 260 * with the stack pointer in sleep.S. 261 */ 262 enum { 263 SLEEP_SAVE_PSTR, 264 SLEEP_SAVE_MDREFR, 265 SLEEP_SAVE_PCFR, 266 SLEEP_SAVE_COUNT 267 }; 268 269 void pxa27x_cpu_pm_save(unsigned long *sleep_save) 270 { 271 sleep_save[SLEEP_SAVE_MDREFR] = __raw_readl(MDREFR); 272 SAVE(PCFR); 273 274 SAVE(PSTR); 275 } 276 277 void pxa27x_cpu_pm_restore(unsigned long *sleep_save) 278 { 279 __raw_writel(sleep_save[SLEEP_SAVE_MDREFR], MDREFR); 280 RESTORE(PCFR); 281 282 PSSR = PSSR_RDH | PSSR_PH; 283 284 RESTORE(PSTR); 285 } 286 287 void pxa27x_cpu_pm_enter(suspend_state_t state) 288 { 289 extern void pxa_cpu_standby(void); 290 #ifndef CONFIG_IWMMXT 291 u64 acc0; 292 293 asm volatile("mra %Q0, %R0, acc0" : "=r" (acc0)); 294 #endif 295 296 /* ensure voltage-change sequencer not initiated, which hangs */ 297 PCFR &= ~PCFR_FVC; 298 299 /* Clear edge-detect status register. */ 300 PEDR = 0xDF12FE1B; 301 302 /* Clear reset status */ 303 RCSR = RCSR_HWR | RCSR_WDR | RCSR_SMR | RCSR_GPR; 304 305 switch (state) { 306 case PM_SUSPEND_STANDBY: 307 pxa_cpu_standby(); 308 break; 309 case PM_SUSPEND_MEM: 310 cpu_suspend(pwrmode, pxa27x_finish_suspend); 311 #ifndef CONFIG_IWMMXT 312 asm volatile("mar acc0, %Q0, %R0" : "=r" (acc0)); 313 #endif 314 break; 315 } 316 } 317 318 static int pxa27x_cpu_pm_valid(suspend_state_t state) 319 { 320 return state == PM_SUSPEND_MEM || state == PM_SUSPEND_STANDBY; 321 } 322 323 static int pxa27x_cpu_pm_prepare(void) 324 { 325 /* set resume return address */ 326 PSPR = virt_to_phys(cpu_resume); 327 return 0; 328 } 329 330 static void pxa27x_cpu_pm_finish(void) 331 { 332 /* ensure not to come back here if it wasn't intended */ 333 PSPR = 0; 334 } 335 336 static struct pxa_cpu_pm_fns pxa27x_cpu_pm_fns = { 337 .save_count = SLEEP_SAVE_COUNT, 338 .save = pxa27x_cpu_pm_save, 339 .restore = pxa27x_cpu_pm_restore, 340 .valid = pxa27x_cpu_pm_valid, 341 .enter = pxa27x_cpu_pm_enter, 342 .prepare = pxa27x_cpu_pm_prepare, 343 .finish = pxa27x_cpu_pm_finish, 344 }; 345 346 static void __init pxa27x_init_pm(void) 347 { 348 pxa_cpu_pm_fns = &pxa27x_cpu_pm_fns; 349 } 350 #else 351 static inline void pxa27x_init_pm(void) {} 352 #endif 353 354 /* PXA27x: Various gpios can issue wakeup events. This logic only 355 * handles the simple cases, not the WEMUX2 and WEMUX3 options 356 */ 357 static int pxa27x_set_wake(struct irq_data *d, unsigned int on) 358 { 359 int gpio = pxa_irq_to_gpio(d->irq); 360 uint32_t mask; 361 362 if (gpio >= 0 && gpio < 128) 363 return gpio_set_wake(gpio, on); 364 365 if (d->irq == IRQ_KEYPAD) 366 return keypad_set_wake(on); 367 368 switch (d->irq) { 369 case IRQ_RTCAlrm: 370 mask = PWER_RTC; 371 break; 372 case IRQ_USB: 373 mask = 1u << 26; 374 break; 375 default: 376 return -EINVAL; 377 } 378 379 if (on) 380 PWER |= mask; 381 else 382 PWER &=~mask; 383 384 return 0; 385 } 386 387 void __init pxa27x_init_irq(void) 388 { 389 pxa_init_irq(34, pxa27x_set_wake); 390 } 391 392 static struct map_desc pxa27x_io_desc[] __initdata = { 393 { /* Mem Ctl */ 394 .virtual = (unsigned long)SMEMC_VIRT, 395 .pfn = __phys_to_pfn(PXA2XX_SMEMC_BASE), 396 .length = 0x00200000, 397 .type = MT_DEVICE 398 }, { /* IMem ctl */ 399 .virtual = 0xfe000000, 400 .pfn = __phys_to_pfn(0x58000000), 401 .length = 0x00100000, 402 .type = MT_DEVICE 403 }, 404 }; 405 406 void __init pxa27x_map_io(void) 407 { 408 pxa_map_io(); 409 iotable_init(ARRAY_AND_SIZE(pxa27x_io_desc)); 410 pxa27x_get_clk_frequency_khz(1); 411 } 412 413 /* 414 * device registration specific to PXA27x. 415 */ 416 void __init pxa27x_set_i2c_power_info(struct i2c_pxa_platform_data *info) 417 { 418 local_irq_disable(); 419 PCFR |= PCFR_PI2CEN; 420 local_irq_enable(); 421 pxa_register_device(&pxa27x_device_i2c_power, info); 422 } 423 424 static struct pxa_gpio_platform_data pxa27x_gpio_info __initdata = { 425 .gpio_set_wake = gpio_set_wake, 426 }; 427 428 static struct platform_device *devices[] __initdata = { 429 &pxa27x_device_udc, 430 &pxa_device_pmu, 431 &pxa_device_i2s, 432 &pxa_device_asoc_ssp1, 433 &pxa_device_asoc_ssp2, 434 &pxa_device_asoc_ssp3, 435 &pxa_device_asoc_platform, 436 &sa1100_device_rtc, 437 &pxa_device_rtc, 438 &pxa27x_device_ssp1, 439 &pxa27x_device_ssp2, 440 &pxa27x_device_ssp3, 441 &pxa27x_device_pwm0, 442 &pxa27x_device_pwm1, 443 }; 444 445 static int __init pxa27x_init(void) 446 { 447 int ret = 0; 448 449 if (cpu_is_pxa27x()) { 450 451 reset_status = RCSR; 452 453 clkdev_add_table(pxa27x_clkregs, ARRAY_SIZE(pxa27x_clkregs)); 454 455 if ((ret = pxa_init_dma(IRQ_DMA, 32))) 456 return ret; 457 458 pxa27x_init_pm(); 459 460 register_syscore_ops(&pxa_irq_syscore_ops); 461 register_syscore_ops(&pxa2xx_mfp_syscore_ops); 462 register_syscore_ops(&pxa2xx_clock_syscore_ops); 463 464 pxa_register_device(&pxa_device_gpio, &pxa27x_gpio_info); 465 ret = platform_add_devices(devices, ARRAY_SIZE(devices)); 466 } 467 468 return ret; 469 } 470 471 postcore_initcall(pxa27x_init); 472