arch/arm/mach-pxa/pxa3xx.c

   1 /*
   2  * linux/arch/arm/mach-pxa/pxa3xx.c
   3  *
   4  * code specific to pxa3xx aka Monahans
   5  *
   6  * Copyright (C) 2006 Marvell International Ltd.
   7  *
   8  * 2007-09-02: eric miao <eric.miao@marvell.com>
   9  *             initial version
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/kernel.h>
  18 #include <linux/init.h>
  19 #include <linux/pm.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/irq.h>
  22 #include <linux/io.h>
  23 #include <linux/sysdev.h>
  24
  25 #include <asm/mach/map.h>
  26 #include <mach/hardware.h>
  27 #include <mach/gpio.h>
  28 #include <mach/pxa3xx-regs.h>
  29 #include <mach/reset.h>
  30 #include <mach/ohci.h>
  31 #include <mach/pm.h>
  32 #include <mach/dma.h>
  33 #include <mach/regs-intc.h>
  34 #include <mach/smemc.h>
  35 #include <plat/i2c.h>
  36
  37 #include "generic.h"
  38 #include "devices.h"
  39 #include "clock.h"
  40
  41 #define PECR_IE(n)      ((1 << ((n) * 2)) << 28)
  42 #define PECR_IS(n)      ((1 << ((n) * 2)) << 29)
  43
  44 static DEFINE_PXA3_CKEN(pxa3xx_ffuart, FFUART, 14857000, 1);
  45 static DEFINE_PXA3_CKEN(pxa3xx_btuart, BTUART, 14857000, 1);
  46 static DEFINE_PXA3_CKEN(pxa3xx_stuart, STUART, 14857000, 1);
  47 static DEFINE_PXA3_CKEN(pxa3xx_i2c, I2C, 32842000, 0);
  48 static DEFINE_PXA3_CKEN(pxa3xx_udc, UDC, 48000000, 5);
  49 static DEFINE_PXA3_CKEN(pxa3xx_usbh, USBH, 48000000, 0);
  50 static DEFINE_PXA3_CKEN(pxa3xx_u2d, USB2, 48000000, 0);
  51 static DEFINE_PXA3_CKEN(pxa3xx_keypad, KEYPAD, 32768, 0);
  52 static DEFINE_PXA3_CKEN(pxa3xx_ssp1, SSP1, 13000000, 0);
  53 static DEFINE_PXA3_CKEN(pxa3xx_ssp2, SSP2, 13000000, 0);
  54 static DEFINE_PXA3_CKEN(pxa3xx_ssp3, SSP3, 13000000, 0);
  55 static DEFINE_PXA3_CKEN(pxa3xx_ssp4, SSP4, 13000000, 0);
  56 static DEFINE_PXA3_CKEN(pxa3xx_pwm0, PWM0, 13000000, 0);
  57 static DEFINE_PXA3_CKEN(pxa3xx_pwm1, PWM1, 13000000, 0);
  58 static DEFINE_PXA3_CKEN(pxa3xx_mmc1, MMC1, 19500000, 0);
  59 static DEFINE_PXA3_CKEN(pxa3xx_mmc2, MMC2, 19500000, 0);
  60
  61 static DEFINE_CK(pxa3xx_lcd, LCD, &clk_pxa3xx_hsio_ops);
  62 static DEFINE_CK(pxa3xx_smemc, SMC, &clk_pxa3xx_smemc_ops);
  63 static DEFINE_CK(pxa3xx_camera, CAMERA, &clk_pxa3xx_hsio_ops);
  64 static DEFINE_CK(pxa3xx_ac97, AC97, &clk_pxa3xx_ac97_ops);
  65 static DEFINE_CLK(pxa3xx_pout, &clk_pxa3xx_pout_ops, 13000000, 70);
  66
  67 static struct clk_lookup pxa3xx_clkregs[] = {
  68         INIT_CLKREG(&clk_pxa3xx_pout, NULL, "CLK_POUT"),
  69         /* Power I2C clock is always on */
  70         INIT_CLKREG(&clk_dummy, "pxa3xx-pwri2c.1", NULL),
  71         INIT_CLKREG(&clk_pxa3xx_lcd, "pxa2xx-fb", NULL),
  72         INIT_CLKREG(&clk_pxa3xx_camera, NULL, "CAMCLK"),
  73         INIT_CLKREG(&clk_pxa3xx_ac97, NULL, "AC97CLK"),
  74         INIT_CLKREG(&clk_pxa3xx_ffuart, "pxa2xx-uart.0", NULL),
  75         INIT_CLKREG(&clk_pxa3xx_btuart, "pxa2xx-uart.1", NULL),
  76         INIT_CLKREG(&clk_pxa3xx_stuart, "pxa2xx-uart.2", NULL),
  77         INIT_CLKREG(&clk_pxa3xx_stuart, "pxa2xx-ir", "UARTCLK"),
  78         INIT_CLKREG(&clk_pxa3xx_i2c, "pxa2xx-i2c.0", NULL),
  79         INIT_CLKREG(&clk_pxa3xx_udc, "pxa27x-udc", NULL),
  80         INIT_CLKREG(&clk_pxa3xx_usbh, "pxa27x-ohci", NULL),
  81         INIT_CLKREG(&clk_pxa3xx_u2d, "pxa3xx-u2d", NULL),
  82         INIT_CLKREG(&clk_pxa3xx_keypad, "pxa27x-keypad", NULL),
  83         INIT_CLKREG(&clk_pxa3xx_ssp1, "pxa27x-ssp.0", NULL),
  84         INIT_CLKREG(&clk_pxa3xx_ssp2, "pxa27x-ssp.1", NULL),
  85         INIT_CLKREG(&clk_pxa3xx_ssp3, "pxa27x-ssp.2", NULL),
  86         INIT_CLKREG(&clk_pxa3xx_ssp4, "pxa27x-ssp.3", NULL),
  87         INIT_CLKREG(&clk_pxa3xx_pwm0, "pxa27x-pwm.0", NULL),
  88         INIT_CLKREG(&clk_pxa3xx_pwm1, "pxa27x-pwm.1", NULL),
  89         INIT_CLKREG(&clk_pxa3xx_mmc1, "pxa2xx-mci.0", NULL),
  90         INIT_CLKREG(&clk_pxa3xx_mmc2, "pxa2xx-mci.1", NULL),
  91         INIT_CLKREG(&clk_pxa3xx_smemc, "pxa2xx-pcmcia", NULL),
  92 };
  93
  94 #ifdef CONFIG_PM
  95
  96 #define ISRAM_START     0x5c000000
  97 #define ISRAM_SIZE      SZ_256K
  98
  99 static void __iomem *sram;
 100 static unsigned long wakeup_src;
 101
 102 /*
 103  * Enter a standby mode (S0D1C2 or S0D2C2).  Upon wakeup, the dynamic
 104  * memory controller has to be reinitialised, so we place some code
 105  * in the SRAM to perform this function.
 106  *
 107  * We disable FIQs across the standby - otherwise, we might receive a
 108  * FIQ while the SDRAM is unavailable.
 109  */
 110 static void pxa3xx_cpu_standby(unsigned int pwrmode)
 111 {
 112         extern const char pm_enter_standby_start[], pm_enter_standby_end[];
 113         void (*fn)(unsigned int) = (void __force *)(sram + 0x8000);
 114
 115         memcpy_toio(sram + 0x8000, pm_enter_standby_start,
 116                     pm_enter_standby_end - pm_enter_standby_start);
 117
 118         AD2D0SR = ~0;
 119         AD2D1SR = ~0;
 120         AD2D0ER = wakeup_src;
 121         AD2D1ER = 0;
 122         ASCR = ASCR;
 123         ARSR = ARSR;
 124
 125         local_fiq_disable();
 126         fn(pwrmode);
 127         local_fiq_enable();
 128
 129         AD2D0ER = 0;
 130         AD2D1ER = 0;
 131 }
 132
 133 /*
 134  * NOTE:  currently, the OBM (OEM Boot Module) binary comes along with
 135  * PXA3xx development kits assumes that the resuming process continues
 136  * with the address stored within the first 4 bytes of SDRAM. The PSPR
 137  * register is used privately by BootROM and OBM, and _must_ be set to
 138  * 0x5c014000 for the moment.
 139  */
 140 static void pxa3xx_cpu_pm_suspend(void)
 141 {
 142         volatile unsigned long *p = (volatile void *)0xc0000000;
 143         unsigned long saved_data = *p;
 144
 145         extern void pxa3xx_cpu_suspend(long);
 146
 147         /* resuming from D2 requires the HSIO2/BOOT/TPM clocks enabled */
 148         CKENA |= (1 << CKEN_BOOT) | (1 << CKEN_TPM);
 149         CKENB |= 1 << (CKEN_HSIO2 & 0x1f);
 150
 151         /* clear and setup wakeup source */
 152         AD3SR = ~0;
 153         AD3ER = wakeup_src;
 154         ASCR = ASCR;
 155         ARSR = ARSR;
 156
 157         PCFR |= (1u << 13);                     /* L1_DIS */
 158         PCFR &= ~((1u << 12) | (1u << 1));      /* L0_EN | SL_ROD */
 159
 160         PSPR = 0x5c014000;
 161
 162         /* overwrite with the resume address */
 163         *p = virt_to_phys(cpu_resume);
 164
 165         pxa3xx_cpu_suspend(PLAT_PHYS_OFFSET - PAGE_OFFSET);
 166
 167         *p = saved_data;
 168
 169         AD3ER = 0;
 170 }
 171
 172 static void pxa3xx_cpu_pm_enter(suspend_state_t state)
 173 {
 174         /*
 175          * Don't sleep if no wakeup sources are defined
 176          */
 177         if (wakeup_src == 0) {
 178                 printk(KERN_ERR "Not suspending: no wakeup sources\n");
 179                 return;
 180         }
 181
 182         switch (state) {
 183         case PM_SUSPEND_STANDBY:
 184                 pxa3xx_cpu_standby(PXA3xx_PM_S0D2C2);
 185                 break;
 186
 187         case PM_SUSPEND_MEM:
 188                 pxa3xx_cpu_pm_suspend();
 189                 break;
 190         }
 191 }
 192
 193 static int pxa3xx_cpu_pm_valid(suspend_state_t state)
 194 {
 195         return state == PM_SUSPEND_MEM || state == PM_SUSPEND_STANDBY;
 196 }
 197
 198 static struct pxa_cpu_pm_fns pxa3xx_cpu_pm_fns = {
 199         .valid          = pxa3xx_cpu_pm_valid,
 200         .enter          = pxa3xx_cpu_pm_enter,
 201 };
 202
 203 static void __init pxa3xx_init_pm(void)
 204 {
 205         sram = ioremap(ISRAM_START, ISRAM_SIZE);
 206         if (!sram) {
 207                 printk(KERN_ERR "Unable to map ISRAM: disabling standby/suspend\n");
 208                 return;
 209         }
 210
 211         /*
 212          * Since we copy wakeup code into the SRAM, we need to ensure
 213          * that it is preserved over the low power modes.  Note: bit 8
 214          * is undocumented in the developer manual, but must be set.
 215          */
 216         AD1R |= ADXR_L2 | ADXR_R0;
 217         AD2R |= ADXR_L2 | ADXR_R0;
 218         AD3R |= ADXR_L2 | ADXR_R0;
 219
 220         /*
 221          * Clear the resume enable registers.
 222          */
 223         AD1D0ER = 0;
 224         AD2D0ER = 0;
 225         AD2D1ER = 0;
 226         AD3ER = 0;
 227
 228         pxa_cpu_pm_fns = &pxa3xx_cpu_pm_fns;
 229 }
 230
 231 static int pxa3xx_set_wake(struct irq_data *d, unsigned int on)
 232 {
 233         unsigned long flags, mask = 0;
 234
 235         switch (d->irq) {
 236         case IRQ_SSP3:
 237                 mask = ADXER_MFP_WSSP3;
 238                 break;
 239         case IRQ_MSL:
 240                 mask = ADXER_WMSL0;
 241                 break;
 242         case IRQ_USBH2:
 243         case IRQ_USBH1:
 244                 mask = ADXER_WUSBH;
 245                 break;
 246         case IRQ_KEYPAD:
 247                 mask = ADXER_WKP;
 248                 break;
 249         case IRQ_AC97:
 250                 mask = ADXER_MFP_WAC97;
 251                 break;
 252         case IRQ_USIM:
 253                 mask = ADXER_WUSIM0;
 254                 break;
 255         case IRQ_SSP2:
 256                 mask = ADXER_MFP_WSSP2;
 257                 break;
 258         case IRQ_I2C:
 259                 mask = ADXER_MFP_WI2C;
 260                 break;
 261         case IRQ_STUART:
 262                 mask = ADXER_MFP_WUART3;
 263                 break;
 264         case IRQ_BTUART:
 265                 mask = ADXER_MFP_WUART2;
 266                 break;
 267         case IRQ_FFUART:
 268                 mask = ADXER_MFP_WUART1;
 269                 break;
 270         case IRQ_MMC:
 271                 mask = ADXER_MFP_WMMC1;
 272                 break;
 273         case IRQ_SSP:
 274                 mask = ADXER_MFP_WSSP1;
 275                 break;
 276         case IRQ_RTCAlrm:
 277                 mask = ADXER_WRTC;
 278                 break;
 279         case IRQ_SSP4:
 280                 mask = ADXER_MFP_WSSP4;
 281                 break;
 282         case IRQ_TSI:
 283                 mask = ADXER_WTSI;
 284                 break;
 285         case IRQ_USIM2:
 286                 mask = ADXER_WUSIM1;
 287                 break;
 288         case IRQ_MMC2:
 289                 mask = ADXER_MFP_WMMC2;
 290                 break;
 291         case IRQ_NAND:
 292                 mask = ADXER_MFP_WFLASH;
 293                 break;
 294         case IRQ_USB2:
 295                 mask = ADXER_WUSB2;
 296                 break;
 297         case IRQ_WAKEUP0:
 298                 mask = ADXER_WEXTWAKE0;
 299                 break;
 300         case IRQ_WAKEUP1:
 301                 mask = ADXER_WEXTWAKE1;
 302                 break;
 303         case IRQ_MMC3:
 304                 mask = ADXER_MFP_GEN12;
 305                 break;
 306         default:
 307                 return -EINVAL;
 308         }
 309
 310         local_irq_save(flags);
 311         if (on)
 312                 wakeup_src |= mask;
 313         else
 314                 wakeup_src &= ~mask;
 315         local_irq_restore(flags);
 316
 317         return 0;
 318 }
 319 #else
 320 static inline void pxa3xx_init_pm(void) {}
 321 #define pxa3xx_set_wake NULL
 322 #endif
 323
 324 static void pxa_ack_ext_wakeup(struct irq_data *d)
 325 {
 326         PECR |= PECR_IS(d->irq - IRQ_WAKEUP0);
 327 }
 328
 329 static void pxa_mask_ext_wakeup(struct irq_data *d)
 330 {
 331         ICMR2 &= ~(1 << ((d->irq - PXA_IRQ(0)) & 0x1f));
 332         PECR &= ~PECR_IE(d->irq - IRQ_WAKEUP0);
 333 }
 334
 335 static void pxa_unmask_ext_wakeup(struct irq_data *d)
 336 {
 337         ICMR2 |= 1 << ((d->irq - PXA_IRQ(0)) & 0x1f);
 338         PECR |= PECR_IE(d->irq - IRQ_WAKEUP0);
 339 }
 340
 341 static int pxa_set_ext_wakeup_type(struct irq_data *d, unsigned int flow_type)
 342 {
 343         if (flow_type & IRQ_TYPE_EDGE_RISING)
 344                 PWER |= 1 << (d->irq - IRQ_WAKEUP0);
 345
 346         if (flow_type & IRQ_TYPE_EDGE_FALLING)
 347                 PWER |= 1 << (d->irq - IRQ_WAKEUP0 + 2);
 348
 349         return 0;
 350 }
 351
 352 static struct irq_chip pxa_ext_wakeup_chip = {
 353         .name           = "WAKEUP",
 354         .irq_ack        = pxa_ack_ext_wakeup,
 355         .irq_mask       = pxa_mask_ext_wakeup,
 356         .irq_unmask     = pxa_unmask_ext_wakeup,
 357         .irq_set_type   = pxa_set_ext_wakeup_type,
 358 };
 359
 360 static void __init pxa_init_ext_wakeup_irq(set_wake_t fn)
 361 {
 362         int irq;
 363
 364         for (irq = IRQ_WAKEUP0; irq <= IRQ_WAKEUP1; irq++) {
 365                 set_irq_chip(irq, &pxa_ext_wakeup_chip);
 366                 set_irq_handler(irq, handle_edge_irq);
 367                 set_irq_flags(irq, IRQF_VALID);
 368         }
 369
 370         pxa_ext_wakeup_chip.irq_set_wake = fn;
 371 }
 372
 373 void __init pxa3xx_init_irq(void)
 374 {
 375         /* enable CP6 access */
 376         u32 value;
 377         __asm__ __volatile__("mrc p15, 0, %0, c15, c1, 0\n": "=r"(value));
 378         value |= (1 << 6);
 379         __asm__ __volatile__("mcr p15, 0, %0, c15, c1, 0\n": :"r"(value));
 380
 381         pxa_init_irq(56, pxa3xx_set_wake);
 382         pxa_init_ext_wakeup_irq(pxa3xx_set_wake);
 383         pxa_init_gpio(IRQ_GPIO_2_x, 2, 127, NULL);
 384 }
 385
 386 static struct map_desc pxa3xx_io_desc[] __initdata = {
 387         {       /* Mem Ctl */
 388                 .virtual        = SMEMC_VIRT,
 389                 .pfn            = __phys_to_pfn(PXA3XX_SMEMC_BASE),
 390                 .length         = 0x00200000,
 391                 .type           = MT_DEVICE
 392         }
 393 };
 394
 395 void __init pxa3xx_map_io(void)
 396 {
 397         pxa_map_io();
 398         iotable_init(ARRAY_AND_SIZE(pxa3xx_io_desc));
 399         pxa3xx_get_clk_frequency_khz(1);
 400 }
 401
 402 /*
 403  * device registration specific to PXA3xx.
 404  */
 405
 406 void __init pxa3xx_set_i2c_power_info(struct i2c_pxa_platform_data *info)
 407 {
 408         pxa_register_device(&pxa3xx_device_i2c_power, info);
 409 }
 410
 411 static struct platform_device *devices[] __initdata = {
 412         &pxa27x_device_udc,
 413         &pxa_device_pmu,
 414         &pxa_device_i2s,
 415         &pxa_device_asoc_ssp1,
 416         &pxa_device_asoc_ssp2,
 417         &pxa_device_asoc_ssp3,
 418         &pxa_device_asoc_ssp4,
 419         &pxa_device_asoc_platform,
 420         &sa1100_device_rtc,
 421         &pxa_device_rtc,
 422         &pxa27x_device_ssp1,
 423         &pxa27x_device_ssp2,
 424         &pxa27x_device_ssp3,
 425         &pxa3xx_device_ssp4,
 426         &pxa27x_device_pwm0,
 427         &pxa27x_device_pwm1,
 428 };
 429
 430 static struct sys_device pxa3xx_sysdev[] = {
 431         {
 432                 .cls    = &pxa_irq_sysclass,
 433         }, {
 434                 .cls    = &pxa3xx_mfp_sysclass,
 435         }, {
 436                 .cls    = &pxa_gpio_sysclass,
 437         }, {
 438                 .cls    = &pxa3xx_clock_sysclass,
 439         }
 440 };
 441
 442 static int __init pxa3xx_init(void)
 443 {
 444         int i, ret = 0;
 445
 446         if (cpu_is_pxa3xx()) {
 447
 448                 reset_status = ARSR;
 449
 450                 /*
 451                  * clear RDH bit every time after reset
 452                  *
 453                  * Note: the last 3 bits DxS are write-1-to-clear so carefully
 454                  * preserve them here in case they will be referenced later
 455                  */
 456                 ASCR &= ~(ASCR_RDH | ASCR_D1S | ASCR_D2S | ASCR_D3S);
 457
 458                 clkdev_add_table(pxa3xx_clkregs, ARRAY_SIZE(pxa3xx_clkregs));
 459
 460                 if ((ret = pxa_init_dma(IRQ_DMA, 32)))
 461                         return ret;
 462
 463                 pxa3xx_init_pm();
 464
 465                 for (i = 0; i < ARRAY_SIZE(pxa3xx_sysdev); i++) {
 466                         ret = sysdev_register(&pxa3xx_sysdev[i]);
 467                         if (ret)
 468                                 pr_err("failed to register sysdev[%d]\n", i);
 469                 }
 470
 471                 ret = platform_add_devices(devices, ARRAY_SIZE(devices));
 472         }
 473
 474         return ret;
 475 }
 476
 477 postcore_initcall(pxa3xx_init);