pxa27x.c

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/*
 *  linux/arch/arm/mach-pxa/pxa27x.c
 *
 *  Author: Nicolas Pitre
 *  Created:    Nov 05, 2002
 *  Copyright:  MontaVista Software Inc.
 *
 * Code specific to PXA27x aka Bulverde.
 *
 * 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.
 */
#include <linux/gpio.h>
#include <linux/gpio-pxa.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/suspend.h>
#include <linux/platform_device.h>
#include <linux/syscore_ops.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/i2c/pxa-i2c.h>

#include <asm/mach/map.h>
#include <mach/hardware.h>
#include <asm/irq.h>
#include <asm/suspend.h>
#include <mach/irqs.h>
#include <mach/pxa27x.h>
#include <mach/reset.h>
#include <linux/platform_data/usb-ohci-pxa27x.h>
#include <mach/pm.h>
#include <mach/dma.h>
#include <mach/smemc.h>

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

void pxa27x_clear_otgph(void)
{
    if (cpu_is_pxa27x() && (PSSR & PSSR_OTGPH))
        PSSR |= PSSR_OTGPH;
}
EXPORT_SYMBOL(pxa27x_clear_otgph);

static unsigned long ac97_reset_config[] = {
    GPIO113_GPIO,
    GPIO113_AC97_nRESET,
    GPIO95_GPIO,
    GPIO95_AC97_nRESET,
};

void pxa27x_assert_ac97reset(int reset_gpio, int on)
{
    if (reset_gpio == 113)
        pxa2xx_mfp_config(on ? &ac97_reset_config[0] :
                       &ac97_reset_config[1], 1);

    if (reset_gpio == 95)
        pxa2xx_mfp_config(on ? &ac97_reset_config[2] :
                       &ac97_reset_config[3], 1);
}
EXPORT_SYMBOL_GPL(pxa27x_assert_ac97reset);

/* Crystal clock: 13MHz */
#define BASE_CLK    13000000

/*
 * Get the clock frequency as reflected by CCSR 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 pxa27x_get_clk_frequency_khz(int info)
{
    unsigned long ccsr, clkcfg;
    unsigned int l, L, m, M, n2, N, S;
        int cccr_a, t, ht, b;

    ccsr = CCSR;
    cccr_a = CCCR & (1 << 25);

    /* Read clkcfg register: it has turbo, b, half-turbo (and f) */
    asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg) );
    t  = clkcfg & (1 << 0);
    ht = clkcfg & (1 << 2);
    b  = clkcfg & (1 << 3);

    l  = ccsr & 0x1f;
    n2 = (ccsr>>7) & 0xf;
    m  = (l <= 10) ? 1 : (l <= 20) ? 2 : 4;

    L  = l * BASE_CLK;
    N  = (L * n2) / 2;
    M  = (!cccr_a) ? (L/m) : ((b) ? L : (L/2));
    S  = (b) ? L : (L/2);

    if (info) {
        printk( KERN_INFO "Run Mode clock: %d.%02dMHz (*%d)\n",
            L / 1000000, (L % 1000000) / 10000, l );
        printk( KERN_INFO "Turbo Mode clock: %d.%02dMHz (*%d.%d, %sactive)\n",
            N / 1000000, (N % 1000000)/10000, n2 / 2, (n2 % 2)*5,
            (t) ? "" : "in" );
        printk( KERN_INFO "Memory clock: %d.%02dMHz (/%d)\n",
            M / 1000000, (M % 1000000) / 10000, m );
        printk( KERN_INFO "System bus clock: %d.%02dMHz \n",
            S / 1000000, (S % 1000000) / 10000 );
    }

    return (t) ? (N/1000) : (L/1000);
}

/*
 * Return the current mem clock frequency as reflected by CCCR[A], B, and L
 */
static unsigned long clk_pxa27x_mem_getrate(struct clk *clk)
{
    unsigned long ccsr, clkcfg;
    unsigned int l, L, m, M;
        int cccr_a, b;

    ccsr = CCSR;
    cccr_a = CCCR & (1 << 25);

    /* Read clkcfg register: it has turbo, b, half-turbo (and f) */
    asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg) );
    b = clkcfg & (1 << 3);

    l = ccsr & 0x1f;
    m = (l <= 10) ? 1 : (l <= 20) ? 2 : 4;

    L = l * BASE_CLK;
    M = (!cccr_a) ? (L/m) : ((b) ? L : (L/2));

    return M;
}

static const struct clkops clk_pxa27x_mem_ops = {
    .enable     = clk_dummy_enable,
    .disable    = clk_dummy_disable,
    .getrate    = clk_pxa27x_mem_getrate,
};

/*
 * Return the current LCD clock frequency in units of 10kHz as
 */
static unsigned int pxa27x_get_lcdclk_frequency_10khz(void)
{
    unsigned long ccsr;
    unsigned int l, L, k, K;

    ccsr = CCSR;

    l = ccsr & 0x1f;
    k = (l <= 7) ? 1 : (l <= 16) ? 2 : 4;

    L = l * BASE_CLK;
    K = L / k;

    return (K / 10000);
}

static unsigned long clk_pxa27x_lcd_getrate(struct clk *clk)
{
    return pxa27x_get_lcdclk_frequency_10khz() * 10000;
}

static const struct clkops clk_pxa27x_lcd_ops = {
    .enable     = clk_pxa2xx_cken_enable,
    .disable    = clk_pxa2xx_cken_disable,
    .getrate    = clk_pxa27x_lcd_getrate,
};

static DEFINE_PXA2_CKEN(pxa27x_ffuart, FFUART, 14857000, 1);
static DEFINE_PXA2_CKEN(pxa27x_btuart, BTUART, 14857000, 1);
static DEFINE_PXA2_CKEN(pxa27x_stuart, STUART, 14857000, 1);
static DEFINE_PXA2_CKEN(pxa27x_i2s, I2S, 14682000, 0);
static DEFINE_PXA2_CKEN(pxa27x_i2c, I2C, 32842000, 0);
static DEFINE_PXA2_CKEN(pxa27x_usb, USB, 48000000, 5);
static DEFINE_PXA2_CKEN(pxa27x_mmc, MMC, 19500000, 0);
static DEFINE_PXA2_CKEN(pxa27x_ficp, FICP, 48000000, 0);
static DEFINE_PXA2_CKEN(pxa27x_usbhost, USBHOST, 48000000, 0);
static DEFINE_PXA2_CKEN(pxa27x_pwri2c, PWRI2C, 13000000, 0);
static DEFINE_PXA2_CKEN(pxa27x_keypad, KEYPAD, 32768, 0);
static DEFINE_PXA2_CKEN(pxa27x_ssp1, SSP1, 13000000, 0);
static DEFINE_PXA2_CKEN(pxa27x_ssp2, SSP2, 13000000, 0);
static DEFINE_PXA2_CKEN(pxa27x_ssp3, SSP3, 13000000, 0);
static DEFINE_PXA2_CKEN(pxa27x_pwm0, PWM0, 13000000, 0);
static DEFINE_PXA2_CKEN(pxa27x_pwm1, PWM1, 13000000, 0);
static DEFINE_PXA2_CKEN(pxa27x_ac97, AC97, 24576000, 0);
static DEFINE_PXA2_CKEN(pxa27x_ac97conf, AC97CONF, 24576000, 0);
static DEFINE_PXA2_CKEN(pxa27x_msl, MSL, 48000000, 0);
static DEFINE_PXA2_CKEN(pxa27x_usim, USIM, 48000000, 0);
static DEFINE_PXA2_CKEN(pxa27x_memstk, MEMSTK, 19500000, 0);
static DEFINE_PXA2_CKEN(pxa27x_im, IM, 0, 0);
static DEFINE_PXA2_CKEN(pxa27x_memc, MEMC, 0, 0);

static DEFINE_CK(pxa27x_lcd, LCD, &clk_pxa27x_lcd_ops);
static DEFINE_CK(pxa27x_camera, CAMERA, &clk_pxa27x_lcd_ops);
static DEFINE_CLK(pxa27x_mem, &clk_pxa27x_mem_ops, 0, 0);

static struct clk_lookup pxa27x_clkregs[] = {
    INIT_CLKREG(&clk_pxa27x_lcd, "pxa2xx-fb", NULL),
    INIT_CLKREG(&clk_pxa27x_camera, "pxa27x-camera.0", NULL),
    INIT_CLKREG(&clk_pxa27x_ffuart, "pxa2xx-uart.0", NULL),
    INIT_CLKREG(&clk_pxa27x_btuart, "pxa2xx-uart.1", NULL),
    INIT_CLKREG(&clk_pxa27x_stuart, "pxa2xx-uart.2", NULL),
    INIT_CLKREG(&clk_pxa27x_i2s, "pxa2xx-i2s", NULL),
    INIT_CLKREG(&clk_pxa27x_i2c, "pxa2xx-i2c.0", NULL),
    INIT_CLKREG(&clk_pxa27x_usb, "pxa27x-udc", NULL),
    INIT_CLKREG(&clk_pxa27x_mmc, "pxa2xx-mci.0", NULL),
    INIT_CLKREG(&clk_pxa27x_stuart, "pxa2xx-ir", "UARTCLK"),
    INIT_CLKREG(&clk_pxa27x_ficp, "pxa2xx-ir", "FICPCLK"),
    INIT_CLKREG(&clk_pxa27x_usbhost, "pxa27x-ohci", NULL),
    INIT_CLKREG(&clk_pxa27x_pwri2c, "pxa2xx-i2c.1", NULL),
    INIT_CLKREG(&clk_pxa27x_keypad, "pxa27x-keypad", NULL),
    INIT_CLKREG(&clk_pxa27x_ssp1, "pxa27x-ssp.0", NULL),
    INIT_CLKREG(&clk_pxa27x_ssp2, "pxa27x-ssp.1", NULL),
    INIT_CLKREG(&clk_pxa27x_ssp3, "pxa27x-ssp.2", NULL),
    INIT_CLKREG(&clk_pxa27x_pwm0, "pxa27x-pwm.0", NULL),
    INIT_CLKREG(&clk_pxa27x_pwm1, "pxa27x-pwm.1", NULL),
    INIT_CLKREG(&clk_pxa27x_ac97, NULL, "AC97CLK"),
    INIT_CLKREG(&clk_pxa27x_ac97conf, NULL, "AC97CONFCLK"),
    INIT_CLKREG(&clk_pxa27x_msl, NULL, "MSLCLK"),
    INIT_CLKREG(&clk_pxa27x_usim, NULL, "USIMCLK"),
    INIT_CLKREG(&clk_pxa27x_memstk, NULL, "MSTKCLK"),
    INIT_CLKREG(&clk_pxa27x_im, NULL, "IMCLK"),
    INIT_CLKREG(&clk_pxa27x_memc, NULL, "MEMCLK"),
    INIT_CLKREG(&clk_pxa27x_mem, "pxa2xx-pcmcia", NULL),
    INIT_CLKREG(&clk_dummy, "pxa-gpio", NULL),
};

#ifdef CONFIG_PM

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

/*
 * allow platforms to override default PWRMODE setting used for PM_SUSPEND_MEM
 */
static unsigned int pwrmode = PWRMODE_SLEEP;

int __init pxa27x_set_pwrmode(unsigned int mode)
{
    switch (mode) {
    case PWRMODE_SLEEP:
    case PWRMODE_DEEPSLEEP:
        pwrmode = mode;
        return 0;
    }

    return -EINVAL;
}

/*
 * 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_MDREFR,
    SLEEP_SAVE_PCFR,
    SLEEP_SAVE_COUNT
};

void pxa27x_cpu_pm_save(unsigned long *sleep_save)
{
    sleep_save[SLEEP_SAVE_MDREFR] = __raw_readl(MDREFR);
    SAVE(PCFR);

    SAVE(PSTR);
}

void pxa27x_cpu_pm_restore(unsigned long *sleep_save)
{
    __raw_writel(sleep_save[SLEEP_SAVE_MDREFR], MDREFR);
    RESTORE(PCFR);

    PSSR = PSSR_RDH | PSSR_PH;

    RESTORE(PSTR);
}

void pxa27x_cpu_pm_enter(suspend_state_t state)
{
    extern void pxa_cpu_standby(void);
#ifndef CONFIG_IWMMXT
    u64 acc0;

    asm volatile("mra %Q0, %R0, acc0" : "=r" (acc0));
#endif

    /* ensure voltage-change sequencer not initiated, which hangs */
    PCFR &= ~PCFR_FVC;

    /* Clear edge-detect status register. */
    PEDR = 0xDF12FE1B;

    /* Clear reset status */
    RCSR = RCSR_HWR | RCSR_WDR | RCSR_SMR | RCSR_GPR;

    switch (state) {
    case PM_SUSPEND_STANDBY:
        pxa_cpu_standby();
        break;
    case PM_SUSPEND_MEM:
        cpu_suspend(pwrmode, pxa27x_finish_suspend);
#ifndef CONFIG_IWMMXT
        asm volatile("mar acc0, %Q0, %R0" : "=r" (acc0));
#endif
        break;
    }
}

static int pxa27x_cpu_pm_valid(suspend_state_t state)
{
    return state == PM_SUSPEND_MEM || state == PM_SUSPEND_STANDBY;
}

static int pxa27x_cpu_pm_prepare(void)
{
    /* set resume return address */
    PSPR = virt_to_phys(cpu_resume);
    return 0;
}

static void pxa27x_cpu_pm_finish(void)
{
    /* ensure not to come back here if it wasn't intended */
    PSPR = 0;
}

static struct pxa_cpu_pm_fns pxa27x_cpu_pm_fns = {
    .save_count = SLEEP_SAVE_COUNT,
    .save       = pxa27x_cpu_pm_save,
    .restore    = pxa27x_cpu_pm_restore,
    .valid      = pxa27x_cpu_pm_valid,
    .enter      = pxa27x_cpu_pm_enter,
    .prepare    = pxa27x_cpu_pm_prepare,
    .finish     = pxa27x_cpu_pm_finish,
};

static void __init pxa27x_init_pm(void)
{
    pxa_cpu_pm_fns = &pxa27x_cpu_pm_fns;
}
#else
static inline void pxa27x_init_pm(void) {}
#endif

/* PXA27x:  Various gpios can issue wakeup events.  This logic only
 * handles the simple cases, not the WEMUX2 and WEMUX3 options
 */
static int pxa27x_set_wake(struct irq_data *d, unsigned int on)
{
    int gpio = pxa_irq_to_gpio(d->irq);
    uint32_t mask;

    if (gpio >= 0 && gpio < 128)
        return gpio_set_wake(gpio, on);

    if (d->irq == IRQ_KEYPAD)
        return keypad_set_wake(on);

    switch (d->irq) {
    case IRQ_RTCAlrm:
        mask = PWER_RTC;
        break;
    case IRQ_USB:
        mask = 1u << 26;
        break;
    default:
        return -EINVAL;
    }

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

    return 0;
}

void __init pxa27x_init_irq(void)
{
    pxa_init_irq(34, pxa27x_set_wake);
}

static struct map_desc pxa27x_io_desc[] __initdata = {
    {   /* Mem Ctl */
        .virtual    = (unsigned long)SMEMC_VIRT,
        .pfn        = __phys_to_pfn(PXA2XX_SMEMC_BASE),
        .length     = 0x00200000,
        .type       = MT_DEVICE
    }, {    /* IMem ctl */
        .virtual    =  0xfe000000,
        .pfn        = __phys_to_pfn(0x58000000),
        .length     = 0x00100000,
        .type       = MT_DEVICE
    },
};

void __init pxa27x_map_io(void)
{
    pxa_map_io();
    iotable_init(ARRAY_AND_SIZE(pxa27x_io_desc));
    pxa27x_get_clk_frequency_khz(1);
}

/*
 * device registration specific to PXA27x.
 */
void __init pxa27x_set_i2c_power_info(struct i2c_pxa_platform_data *info)
{
    local_irq_disable();
    PCFR |= PCFR_PI2CEN;
    local_irq_enable();
    pxa_register_device(&pxa27x_device_i2c_power, info);
}

static struct pxa_gpio_platform_data pxa27x_gpio_info __initdata = {
    .gpio_set_wake = gpio_set_wake,
};

static struct platform_device *devices[] __initdata = {
    &pxa27x_device_udc,
    &pxa_device_pmu,
    &pxa_device_i2s,
    &pxa_device_asoc_ssp1,
    &pxa_device_asoc_ssp2,
    &pxa_device_asoc_ssp3,
    &pxa_device_asoc_platform,
    &sa1100_device_rtc,
    &pxa_device_rtc,
    &pxa27x_device_ssp1,
    &pxa27x_device_ssp2,
    &pxa27x_device_ssp3,
    &pxa27x_device_pwm0,
    &pxa27x_device_pwm1,
};

static int __init pxa27x_init(void)
{
    int ret = 0;

    if (cpu_is_pxa27x()) {

        reset_status = RCSR;

        clkdev_add_table(pxa27x_clkregs, ARRAY_SIZE(pxa27x_clkregs));

        if ((ret = pxa_init_dma(IRQ_DMA, 32)))
            return ret;

        pxa27x_init_pm();

        register_syscore_ops(&pxa_irq_syscore_ops);
        register_syscore_ops(&pxa2xx_mfp_syscore_ops);
        register_syscore_ops(&pxa2xx_clock_syscore_ops);

        pxa_register_device(&pxa_device_gpio, &pxa27x_gpio_info);
        ret = platform_add_devices(devices, ARRAY_SIZE(devices));
    }

    return ret;
}

postcore_initcall(pxa27x_init);