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pxa25x.c

/*
 *  linux/arch/arm/mach-pxa/pxa25x.c
 *
 *  Author: Nicolas Pitre
 *  Created:      Jun 15, 2001
 *  Copyright:    MontaVista Software Inc.
 *
 * Code specific to PXA21x/25x/26x variants.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Since this file should be linked before any other machine specific file,
 * the __initcall() here will be executed first.  This serves as default
 * initialization stuff for PXA machines which can be overridden later if
 * need be.
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/suspend.h>
#include <linux/sysdev.h>

#include <mach/hardware.h>
#include <mach/irqs.h>
#include <mach/gpio.h>
#include <mach/pxa25x.h>
#include <mach/reset.h>
#include <mach/pm.h>
#include <mach/dma.h>

#include "generic.h"
#include "devices.h"
#include "clock.h"

/*
 * Various clock factors driven by the CCCR register.
 */

/* Crystal Frequency to Memory Frequency Multiplier (L) */
static unsigned char L_clk_mult[32] = { 0, 27, 32, 36, 40, 45, 0, };

/* Memory Frequency to Run Mode Frequency Multiplier (M) */
static unsigned char M_clk_mult[4] = { 0, 1, 2, 4 };

/* Run Mode Frequency to Turbo Mode Frequency Multiplier (N) */
/* Note: we store the value N * 2 here. */
static unsigned char N2_clk_mult[8] = { 0, 0, 2, 3, 4, 0, 6, 0 };

/* Crystal clock */
#define BASE_CLK  3686400

/*
 * Get the clock frequency as reflected by CCCR and the turbo flag.
 * We assume these values have been applied via a fcs.
 * If info is not 0 we also display the current settings.
 */
unsigned int pxa25x_get_clk_frequency_khz(int info)
{
      unsigned long cccr, turbo;
      unsigned int l, L, m, M, n2, N;

      cccr = CCCR;
      asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (turbo) );

      l  =  L_clk_mult[(cccr >> 0) & 0x1f];
      m  =  M_clk_mult[(cccr >> 5) & 0x03];
      n2 = N2_clk_mult[(cccr >> 7) & 0x07];

      L = l * BASE_CLK;
      M = m * L;
      N = n2 * M / 2;

      if(info)
      {
            L += 5000;
            printk( KERN_INFO "Memory clock: %d.%02dMHz (*%d)\n",
                  L / 1000000, (L % 1000000) / 10000, l );
            M += 5000;
            printk( KERN_INFO "Run Mode clock: %d.%02dMHz (*%d)\n",
                  M / 1000000, (M % 1000000) / 10000, m );
            N += 5000;
            printk( KERN_INFO "Turbo Mode clock: %d.%02dMHz (*%d.%d, %sactive)\n",
                  N / 1000000, (N % 1000000) / 10000, n2 / 2, (n2 % 2) * 5,
                  (turbo & 1) ? "" : "in" );
      }

      return (turbo & 1) ? (N/1000) : (M/1000);
}

/*
 * Return the current memory clock frequency in units of 10kHz
 */
unsigned int pxa25x_get_memclk_frequency_10khz(void)
{
      return L_clk_mult[(CCCR >> 0) & 0x1f] * BASE_CLK / 10000;
}

static unsigned long clk_pxa25x_lcd_getrate(struct clk *clk)
{
      return pxa25x_get_memclk_frequency_10khz() * 10000;
}

static const struct clkops clk_pxa25x_lcd_ops = {
      .enable           = clk_cken_enable,
      .disable    = clk_cken_disable,
      .getrate    = clk_pxa25x_lcd_getrate,
};

static unsigned long gpio12_config_32k[] = {
      GPIO12_32KHz,
};

static unsigned long gpio12_config_gpio[] = {
      GPIO12_GPIO,
};

static void clk_gpio12_enable(struct clk *clk)
{
      pxa2xx_mfp_config(gpio12_config_32k, 1);
}

static void clk_gpio12_disable(struct clk *clk)
{
      pxa2xx_mfp_config(gpio12_config_gpio, 1);
}

static const struct clkops clk_pxa25x_gpio12_ops = {
      .enable         = clk_gpio12_enable,
      .disable        = clk_gpio12_disable,
};

static unsigned long gpio11_config_3m6[] = {
      GPIO11_3_6MHz,
};

static unsigned long gpio11_config_gpio[] = {
      GPIO11_GPIO,
};

static void clk_gpio11_enable(struct clk *clk)
{
      pxa2xx_mfp_config(gpio11_config_3m6, 1);
}

static void clk_gpio11_disable(struct clk *clk)
{
      pxa2xx_mfp_config(gpio11_config_gpio, 1);
}

static const struct clkops clk_pxa25x_gpio11_ops = {
      .enable         = clk_gpio11_enable,
      .disable        = clk_gpio11_disable,
};

/*
 * 3.6864MHz -> OST, GPIO, SSP, PWM, PLLs (95.842MHz, 147.456MHz)
 * 95.842MHz -> MMC 19.169MHz, I2C 31.949MHz, FICP 47.923MHz, USB 47.923MHz
 * 147.456MHz -> UART 14.7456MHz, AC97 12.288MHz, I2S 5.672MHz (allegedly)
 */
static DEFINE_CKEN(pxa25x_hwuart, HWUART, 14745600, 1);

static struct clk_lookup pxa25x_hwuart_clkreg =
      INIT_CLKREG(&clk_pxa25x_hwuart, "pxa2xx-uart.3", NULL);

/*
 * PXA 2xx clock declarations.
 */
static DEFINE_CK(pxa25x_lcd, LCD, &clk_pxa25x_lcd_ops);
static DEFINE_CKEN(pxa25x_ffuart, FFUART, 14745600, 1);
static DEFINE_CKEN(pxa25x_btuart, BTUART, 14745600, 1);
static DEFINE_CKEN(pxa25x_stuart, STUART, 14745600, 1);
static DEFINE_CKEN(pxa25x_usb, USB, 47923000, 5);
static DEFINE_CLK(pxa25x_gpio11, &clk_pxa25x_gpio11_ops, 3686400, 0);
static DEFINE_CLK(pxa25x_gpio12, &clk_pxa25x_gpio12_ops, 32768, 0);
static DEFINE_CKEN(pxa25x_mmc, MMC, 19169000, 0);
static DEFINE_CKEN(pxa25x_i2c, I2C, 31949000, 0);
static DEFINE_CKEN(pxa25x_ssp, SSP, 3686400, 0);
static DEFINE_CKEN(pxa25x_nssp, NSSP, 3686400, 0);
static DEFINE_CKEN(pxa25x_assp, ASSP, 3686400, 0);
static DEFINE_CKEN(pxa25x_pwm0, PWM0, 3686400, 0);
static DEFINE_CKEN(pxa25x_pwm1, PWM1, 3686400, 0);
static DEFINE_CKEN(pxa25x_ac97, AC97, 24576000, 0);
static DEFINE_CKEN(pxa25x_i2s, I2S, 14745600, 0);
static DEFINE_CKEN(pxa25x_ficp, FICP, 47923000, 0);

static struct clk_lookup pxa25x_clkregs[] = {
      INIT_CLKREG(&clk_pxa25x_lcd, "pxa2xx-fb", NULL),
      INIT_CLKREG(&clk_pxa25x_ffuart, "pxa2xx-uart.0", NULL),
      INIT_CLKREG(&clk_pxa25x_btuart, "pxa2xx-uart.1", NULL),
      INIT_CLKREG(&clk_pxa25x_stuart, "pxa2xx-uart.2", NULL),
      INIT_CLKREG(&clk_pxa25x_usb, "pxa25x-udc", NULL),
      INIT_CLKREG(&clk_pxa25x_mmc, "pxa2xx-mci.0", NULL),
      INIT_CLKREG(&clk_pxa25x_i2c, "pxa2xx-i2c.0", NULL),
      INIT_CLKREG(&clk_pxa25x_ssp, "pxa25x-ssp.0", NULL),
      INIT_CLKREG(&clk_pxa25x_nssp, "pxa25x-nssp.1", NULL),
      INIT_CLKREG(&clk_pxa25x_assp, "pxa25x-nssp.2", NULL),
      INIT_CLKREG(&clk_pxa25x_pwm0, "pxa25x-pwm.0", NULL),
      INIT_CLKREG(&clk_pxa25x_pwm1, "pxa25x-pwm.1", NULL),
      INIT_CLKREG(&clk_pxa25x_i2s, "pxa2xx-i2s", NULL),
      INIT_CLKREG(&clk_pxa25x_stuart, "pxa2xx-ir", "UARTCLK"),
      INIT_CLKREG(&clk_pxa25x_ficp, "pxa2xx-ir", "FICPCLK"),
      INIT_CLKREG(&clk_pxa25x_ac97, NULL, "AC97CLK"),
      INIT_CLKREG(&clk_pxa25x_gpio11, NULL, "GPIO11_CLK"),
      INIT_CLKREG(&clk_pxa25x_gpio12, NULL, "GPIO12_CLK"),
};

#ifdef CONFIG_PM

#define SAVE(x)         sleep_save[SLEEP_SAVE_##x] = x
#define RESTORE(x)      x = sleep_save[SLEEP_SAVE_##x]

/*
 * List of global PXA peripheral registers to preserve.
 * More ones like CP and general purpose register values are preserved
 * with the stack pointer in sleep.S.
 */
enum {
      SLEEP_SAVE_PSTR,
      SLEEP_SAVE_CKEN,
      SLEEP_SAVE_COUNT
};


static void pxa25x_cpu_pm_save(unsigned long *sleep_save)
{
      SAVE(CKEN);
      SAVE(PSTR);
}

static void pxa25x_cpu_pm_restore(unsigned long *sleep_save)
{
      RESTORE(CKEN);
      RESTORE(PSTR);
}

static void pxa25x_cpu_pm_enter(suspend_state_t state)
{
      /* Clear reset status */
      RCSR = RCSR_HWR | RCSR_WDR | RCSR_SMR | RCSR_GPR;

      switch (state) {
      case PM_SUSPEND_MEM:
            pxa25x_cpu_suspend(PWRMODE_SLEEP);
            break;
      }
}

static int pxa25x_cpu_pm_prepare(void)
{
      /* set resume return address */
      PSPR = virt_to_phys(pxa_cpu_resume);
      return 0;
}

static void pxa25x_cpu_pm_finish(void)
{
      /* ensure not to come back here if it wasn't intended */
      PSPR = 0;
}

static struct pxa_cpu_pm_fns pxa25x_cpu_pm_fns = {
      .save_count = SLEEP_SAVE_COUNT,
      .valid            = suspend_valid_only_mem,
      .save       = pxa25x_cpu_pm_save,
      .restore    = pxa25x_cpu_pm_restore,
      .enter            = pxa25x_cpu_pm_enter,
      .prepare    = pxa25x_cpu_pm_prepare,
      .finish           = pxa25x_cpu_pm_finish,
};

static void __init pxa25x_init_pm(void)
{
      pxa_cpu_pm_fns = &pxa25x_cpu_pm_fns;
}
#else
static inline void pxa25x_init_pm(void) {}
#endif

/* PXA25x: supports wakeup from GPIO0..GPIO15 and RTC alarm
 */

static int pxa25x_set_wake(unsigned int irq, unsigned int on)
{
      int gpio = IRQ_TO_GPIO(irq);
      uint32_t mask = 0;

      if (gpio >= 0 && gpio < 85)
            return gpio_set_wake(gpio, on);

      if (irq == IRQ_RTCAlrm) {
            mask = PWER_RTC;
            goto set_pwer;
      }

      return -EINVAL;

set_pwer:
      if (on)
            PWER |= mask;
      else
            PWER &=~mask;

      return 0;
}

void __init pxa25x_init_irq(void)
{
      pxa_init_irq(32, pxa25x_set_wake);
      pxa_init_gpio(IRQ_GPIO_2_x, 2, 84, pxa25x_set_wake);
}

#ifdef CONFIG_CPU_PXA26x
void __init pxa26x_init_irq(void)
{
      pxa_init_irq(32, pxa25x_set_wake);
      pxa_init_gpio(IRQ_GPIO_2_x, 2, 89, pxa25x_set_wake);
}
#endif

static struct platform_device *pxa25x_devices[] __initdata = {
      &pxa25x_device_udc,
      &pxa_device_ffuart,
      &pxa_device_btuart,
      &pxa_device_stuart,
      &pxa_device_i2s,
      &sa1100_device_rtc,
      &pxa25x_device_ssp,
      &pxa25x_device_nssp,
      &pxa25x_device_assp,
      &pxa25x_device_pwm0,
      &pxa25x_device_pwm1,
};

static struct sys_device pxa25x_sysdev[] = {
      {
            .cls  = &pxa_irq_sysclass,
      }, {
            .cls  = &pxa2xx_mfp_sysclass,
      }, {
            .cls  = &pxa_gpio_sysclass,
      },
};

static int __init pxa25x_init(void)
{
      int i, ret = 0;

      if (cpu_is_pxa25x()) {

            reset_status = RCSR;

            clks_register(pxa25x_clkregs, ARRAY_SIZE(pxa25x_clkregs));

            if ((ret = pxa_init_dma(IRQ_DMA, 16)))
                  return ret;

            pxa25x_init_pm();

            for (i = 0; i < ARRAY_SIZE(pxa25x_sysdev); i++) {
                  ret = sysdev_register(&pxa25x_sysdev[i]);
                  if (ret)
                        pr_err("failed to register sysdev[%d]\n", i);
            }

            ret = platform_add_devices(pxa25x_devices,
                                 ARRAY_SIZE(pxa25x_devices));
            if (ret)
                  return ret;
      }

      /* Only add HWUART for PXA255/26x; PXA210/250 do not have it. */
      if (cpu_is_pxa255()) {
            clks_register(&pxa25x_hwuart_clkreg, 1);
            ret = platform_device_register(&pxa_device_hwuart);
      }

      return ret;
}

postcore_initcall(pxa25x_init);

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