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/dmaengine.h>
  15 #include <linux/dma/pxa-dma.h>
  16 #include <linux/gpio.h>
  17 #include <linux/gpio-pxa.h>
  18 #include <linux/module.h>
  19 #include <linux/kernel.h>
  20 #include <linux/init.h>
  21 #include <linux/irqchip.h>
  22 #include <linux/suspend.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/syscore_ops.h>
  25 #include <linux/io.h>
  26 #include <linux/irq.h>
  27 #include <linux/platform_data/i2c-pxa.h>
  28 #include <linux/platform_data/mmp_dma.h>
  29
  30 #include <asm/mach/map.h>
  31 #include <mach/hardware.h>
  32 #include <asm/irq.h>
  33 #include <asm/suspend.h>
  34 #include <mach/irqs.h>
  35 #include "pxa27x.h"
  36 #include <mach/reset.h>
  37 #include <linux/platform_data/usb-ohci-pxa27x.h>
  38 #include "pm.h"
  39 #include <mach/dma.h>
  40 #include <mach/smemc.h>
  41
  42 #include "generic.h"
  43 #include "devices.h"
  44 #include <linux/clk-provider.h>
  45 #include <linux/clkdev.h>
  46
  47 void pxa27x_clear_otgph(void)
  48 {
  49         if (cpu_is_pxa27x() && (PSSR & PSSR_OTGPH))
  50                 PSSR |= PSSR_OTGPH;
  51 }
  52 EXPORT_SYMBOL(pxa27x_clear_otgph);
  53
  54 static unsigned long ac97_reset_config[] = {
  55         GPIO113_AC97_nRESET_GPIO_HIGH,
  56         GPIO113_AC97_nRESET,
  57         GPIO95_AC97_nRESET_GPIO_HIGH,
  58         GPIO95_AC97_nRESET,
  59 };
  60
  61 void pxa27x_configure_ac97reset(int reset_gpio, bool to_gpio)
  62 {
  63         /*
  64          * This helper function is used to work around a bug in the pxa27x's
  65          * ac97 controller during a warm reset.  The configuration of the
  66          * reset_gpio is changed as follows:
  67          * to_gpio == true: configured to generic output gpio and driven high
  68          * to_gpio == false: configured to ac97 controller alt fn AC97_nRESET
  69          */
  70
  71         if (reset_gpio == 113)
  72                 pxa2xx_mfp_config(to_gpio ? &ac97_reset_config[0] :
  73                                   &ac97_reset_config[1], 1);
  74
  75         if (reset_gpio == 95)
  76                 pxa2xx_mfp_config(to_gpio ? &ac97_reset_config[2] :
  77                                   &ac97_reset_config[3], 1);
  78 }
  79 EXPORT_SYMBOL_GPL(pxa27x_configure_ac97reset);
  80
  81 #ifdef CONFIG_PM
  82
  83 #define SAVE(x)         sleep_save[SLEEP_SAVE_##x] = x
  84 #define RESTORE(x)      x = sleep_save[SLEEP_SAVE_##x]
  85
  86 /*
  87  * allow platforms to override default PWRMODE setting used for PM_SUSPEND_MEM
  88  */
  89 static unsigned int pwrmode = PWRMODE_SLEEP;
  90
  91 int pxa27x_set_pwrmode(unsigned int mode)
  92 {
  93         switch (mode) {
  94         case PWRMODE_SLEEP:
  95         case PWRMODE_DEEPSLEEP:
  96                 pwrmode = mode;
  97                 return 0;
  98         }
  99
 100         return -EINVAL;
 101 }
 102
 103 /*
 104  * List of global PXA peripheral registers to preserve.
 105  * More ones like CP and general purpose register values are preserved
 106  * with the stack pointer in sleep.S.
 107  */
 108 enum {
 109         SLEEP_SAVE_PSTR,
 110         SLEEP_SAVE_MDREFR,
 111         SLEEP_SAVE_PCFR,
 112         SLEEP_SAVE_COUNT
 113 };
 114
 115 void pxa27x_cpu_pm_save(unsigned long *sleep_save)
 116 {
 117         sleep_save[SLEEP_SAVE_MDREFR] = __raw_readl(MDREFR);
 118         SAVE(PCFR);
 119
 120         SAVE(PSTR);
 121 }
 122
 123 void pxa27x_cpu_pm_restore(unsigned long *sleep_save)
 124 {
 125         __raw_writel(sleep_save[SLEEP_SAVE_MDREFR], MDREFR);
 126         RESTORE(PCFR);
 127
 128         PSSR = PSSR_RDH | PSSR_PH;
 129
 130         RESTORE(PSTR);
 131 }
 132
 133 void pxa27x_cpu_pm_enter(suspend_state_t state)
 134 {
 135         extern void pxa_cpu_standby(void);
 136 #ifndef CONFIG_IWMMXT
 137         u64 acc0;
 138
 139         asm volatile(".arch_extension xscale\n\t"
 140                      "mra %Q0, %R0, acc0" : "=r" (acc0));
 141 #endif
 142
 143         /* ensure voltage-change sequencer not initiated, which hangs */
 144         PCFR &= ~PCFR_FVC;
 145
 146         /* Clear edge-detect status register. */
 147         PEDR = 0xDF12FE1B;
 148
 149         /* Clear reset status */
 150         RCSR = RCSR_HWR | RCSR_WDR | RCSR_SMR | RCSR_GPR;
 151
 152         switch (state) {
 153         case PM_SUSPEND_STANDBY:
 154                 pxa_cpu_standby();
 155                 break;
 156         case PM_SUSPEND_MEM:
 157                 cpu_suspend(pwrmode, pxa27x_finish_suspend);
 158 #ifndef CONFIG_IWMMXT
 159                 asm volatile(".arch_extension xscale\n\t"
 160                              "mar acc0, %Q0, %R0" : "=r" (acc0));
 161 #endif
 162                 break;
 163         }
 164 }
 165
 166 static int pxa27x_cpu_pm_valid(suspend_state_t state)
 167 {
 168         return state == PM_SUSPEND_MEM || state == PM_SUSPEND_STANDBY;
 169 }
 170
 171 static int pxa27x_cpu_pm_prepare(void)
 172 {
 173         /* set resume return address */
 174         PSPR = __pa_symbol(cpu_resume);
 175         return 0;
 176 }
 177
 178 static void pxa27x_cpu_pm_finish(void)
 179 {
 180         /* ensure not to come back here if it wasn't intended */
 181         PSPR = 0;
 182 }
 183
 184 static struct pxa_cpu_pm_fns pxa27x_cpu_pm_fns = {
 185         .save_count     = SLEEP_SAVE_COUNT,
 186         .save           = pxa27x_cpu_pm_save,
 187         .restore        = pxa27x_cpu_pm_restore,
 188         .valid          = pxa27x_cpu_pm_valid,
 189         .enter          = pxa27x_cpu_pm_enter,
 190         .prepare        = pxa27x_cpu_pm_prepare,
 191         .finish         = pxa27x_cpu_pm_finish,
 192 };
 193
 194 static void __init pxa27x_init_pm(void)
 195 {
 196         pxa_cpu_pm_fns = &pxa27x_cpu_pm_fns;
 197 }
 198 #else
 199 static inline void pxa27x_init_pm(void) {}
 200 #endif
 201
 202 /* PXA27x:  Various gpios can issue wakeup events.  This logic only
 203  * handles the simple cases, not the WEMUX2 and WEMUX3 options
 204  */
 205 static int pxa27x_set_wake(struct irq_data *d, unsigned int on)
 206 {
 207         int gpio = pxa_irq_to_gpio(d->irq);
 208         uint32_t mask;
 209
 210         if (gpio >= 0 && gpio < 128)
 211                 return gpio_set_wake(gpio, on);
 212
 213         if (d->irq == IRQ_KEYPAD)
 214                 return keypad_set_wake(on);
 215
 216         switch (d->irq) {
 217         case IRQ_RTCAlrm:
 218                 mask = PWER_RTC;
 219                 break;
 220         case IRQ_USB:
 221                 mask = 1u << 26;
 222                 break;
 223         default:
 224                 return -EINVAL;
 225         }
 226
 227         if (on)
 228                 PWER |= mask;
 229         else
 230                 PWER &=~mask;
 231
 232         return 0;
 233 }
 234
 235 void __init pxa27x_init_irq(void)
 236 {
 237         pxa_init_irq(34, pxa27x_set_wake);
 238 }
 239
 240 static int __init
 241 pxa27x_dt_init_irq(struct device_node *node, struct device_node *parent)
 242 {
 243         pxa_dt_irq_init(pxa27x_set_wake);
 244         set_handle_irq(ichp_handle_irq);
 245
 246         return 0;
 247 }
 248 IRQCHIP_DECLARE(pxa27x_intc, "marvell,pxa-intc", pxa27x_dt_init_irq);
 249
 250 static struct map_desc pxa27x_io_desc[] __initdata = {
 251         {       /* Mem Ctl */
 252                 .virtual        = (unsigned long)SMEMC_VIRT,
 253                 .pfn            = __phys_to_pfn(PXA2XX_SMEMC_BASE),
 254                 .length         = SMEMC_SIZE,
 255                 .type           = MT_DEVICE
 256         }, {    /* UNCACHED_PHYS_0 */
 257                 .virtual        = UNCACHED_PHYS_0,
 258                 .pfn            = __phys_to_pfn(0x00000000),
 259                 .length         = UNCACHED_PHYS_0_SIZE,
 260                 .type           = MT_DEVICE
 261         },
 262 };
 263
 264 void __init pxa27x_map_io(void)
 265 {
 266         pxa_map_io();
 267         iotable_init(ARRAY_AND_SIZE(pxa27x_io_desc));
 268         pxa27x_get_clk_frequency_khz(1);
 269 }
 270
 271 /*
 272  * device registration specific to PXA27x.
 273  */
 274 void __init pxa27x_set_i2c_power_info(struct i2c_pxa_platform_data *info)
 275 {
 276         local_irq_disable();
 277         PCFR |= PCFR_PI2CEN;
 278         local_irq_enable();
 279         pxa_register_device(&pxa27x_device_i2c_power, info);
 280 }
 281
 282 static struct pxa_gpio_platform_data pxa27x_gpio_info __initdata = {
 283         .irq_base       = PXA_GPIO_TO_IRQ(0),
 284         .gpio_set_wake  = gpio_set_wake,
 285 };
 286
 287 static struct platform_device *devices[] __initdata = {
 288         &pxa27x_device_udc,
 289         &pxa_device_pmu,
 290         &pxa_device_i2s,
 291         &pxa_device_asoc_ssp1,
 292         &pxa_device_asoc_ssp2,
 293         &pxa_device_asoc_ssp3,
 294         &pxa_device_asoc_platform,
 295         &pxa_device_rtc,
 296         &pxa27x_device_ssp1,
 297         &pxa27x_device_ssp2,
 298         &pxa27x_device_ssp3,
 299         &pxa27x_device_pwm0,
 300         &pxa27x_device_pwm1,
 301 };
 302
 303 static const struct dma_slave_map pxa27x_slave_map[] = {
 304         /* PXA25x, PXA27x and PXA3xx common entries */
 305         { "pxa2xx-ac97", "pcm_pcm_mic_mono", PDMA_FILTER_PARAM(LOWEST, 8) },
 306         { "pxa2xx-ac97", "pcm_pcm_aux_mono_in", PDMA_FILTER_PARAM(LOWEST, 9) },
 307         { "pxa2xx-ac97", "pcm_pcm_aux_mono_out",
 308           PDMA_FILTER_PARAM(LOWEST, 10) },
 309         { "pxa2xx-ac97", "pcm_pcm_stereo_in", PDMA_FILTER_PARAM(LOWEST, 11) },
 310         { "pxa2xx-ac97", "pcm_pcm_stereo_out", PDMA_FILTER_PARAM(LOWEST, 12) },
 311         { "pxa-ssp-dai.0", "rx", PDMA_FILTER_PARAM(LOWEST, 13) },
 312         { "pxa-ssp-dai.0", "tx", PDMA_FILTER_PARAM(LOWEST, 14) },
 313         { "pxa-ssp-dai.1", "rx", PDMA_FILTER_PARAM(LOWEST, 15) },
 314         { "pxa-ssp-dai.1", "tx", PDMA_FILTER_PARAM(LOWEST, 16) },
 315         { "pxa2xx-ir", "rx", PDMA_FILTER_PARAM(LOWEST, 17) },
 316         { "pxa2xx-ir", "tx", PDMA_FILTER_PARAM(LOWEST, 18) },
 317         { "pxa2xx-mci.0", "rx", PDMA_FILTER_PARAM(LOWEST, 21) },
 318         { "pxa2xx-mci.0", "tx", PDMA_FILTER_PARAM(LOWEST, 22) },
 319         { "pxa-ssp-dai.2", "rx", PDMA_FILTER_PARAM(LOWEST, 66) },
 320         { "pxa-ssp-dai.2", "tx", PDMA_FILTER_PARAM(LOWEST, 67) },
 321
 322         /* PXA27x specific map */
 323         { "pxa2xx-i2s", "rx", PDMA_FILTER_PARAM(LOWEST, 2) },
 324         { "pxa2xx-i2s", "tx", PDMA_FILTER_PARAM(LOWEST, 3) },
 325         { "pxa27x-camera.0", "CI_Y", PDMA_FILTER_PARAM(HIGHEST, 68) },
 326         { "pxa27x-camera.0", "CI_U", PDMA_FILTER_PARAM(HIGHEST, 69) },
 327         { "pxa27x-camera.0", "CI_V", PDMA_FILTER_PARAM(HIGHEST, 70) },
 328 };
 329
 330 static struct mmp_dma_platdata pxa27x_dma_pdata = {
 331         .dma_channels   = 32,
 332         .nb_requestors  = 75,
 333         .slave_map      = pxa27x_slave_map,
 334         .slave_map_cnt  = ARRAY_SIZE(pxa27x_slave_map),
 335 };
 336
 337 static int __init pxa27x_init(void)
 338 {
 339         int ret = 0;
 340
 341         if (cpu_is_pxa27x()) {
 342
 343                 reset_status = RCSR;
 344
 345                 pxa27x_init_pm();
 346
 347                 register_syscore_ops(&pxa_irq_syscore_ops);
 348                 register_syscore_ops(&pxa2xx_mfp_syscore_ops);
 349
 350                 if (!of_have_populated_dt()) {
 351                         pxa_register_device(&pxa27x_device_gpio,
 352                                             &pxa27x_gpio_info);
 353                         pxa2xx_set_dmac_info(&pxa27x_dma_pdata);
 354                         ret = platform_add_devices(devices,
 355                                                    ARRAY_SIZE(devices));
 356                 }
 357         }
 358
 359         return ret;
 360 }
 361
 362 postcore_initcall(pxa27x_init);