gumstix.c

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/*
 *  linux/arch/arm/mach-pxa/gumstix.c
 *
 *  Support for the Gumstix motherboards.
 *
 *  Original Author:    Craig Hughes
 *  Created:    Feb 14, 2008
 *  Copyright:  Craig Hughes
 *
 *  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.
 *
 *  Implemented based on lubbock.c by Nicolas Pitre and code from Craig
 *  Hughes
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/gpio.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/usb/gpio_vbus.h>

#include <asm/setup.h>
#include <asm/memory.h>
#include <asm/mach-types.h>
#include <mach/hardware.h>
#include <asm/irq.h>
#include <asm/sizes.h>

#include <asm/mach/arch.h>
#include <asm/mach/map.h>
#include <asm/mach/irq.h>
#include <asm/mach/flash.h>

#include <mach/pxa25x.h>
#include <linux/platform_data/mmc-pxamci.h>
#include <mach/udc.h>
#include <mach/gumstix.h>

#include "generic.h"

static struct resource flash_resource = {
    .start  = 0x00000000,
    .end    = SZ_64M - 1,
    .flags  = IORESOURCE_MEM,
};

static struct mtd_partition gumstix_partitions[] = {
    {
        .name =     "Bootloader",
        .size =     0x00040000,
        .offset =   0,
        .mask_flags =   MTD_WRITEABLE  /* force read-only */
    } , {
        .name =     "rootfs",
        .size =     MTDPART_SIZ_FULL,
        .offset =   MTDPART_OFS_APPEND
    }
};

static struct flash_platform_data gumstix_flash_data = {
    .map_name   = "cfi_probe",
    .parts      = gumstix_partitions,
    .nr_parts   = ARRAY_SIZE(gumstix_partitions),
    .width      = 2,
};

static struct platform_device gumstix_flash_device = {
    .name       = "pxa2xx-flash",
    .id     = 0,
    .dev = {
        .platform_data = &gumstix_flash_data,
    },
    .resource = &flash_resource,
    .num_resources = 1,
};

static struct platform_device *devices[] __initdata = {
    &gumstix_flash_device,
};

#ifdef CONFIG_MMC_PXA
static struct pxamci_platform_data gumstix_mci_platform_data = {
    .ocr_mask       = MMC_VDD_32_33|MMC_VDD_33_34,
    .gpio_card_detect   = -1,
    .gpio_card_ro       = -1,
    .gpio_power     = -1,
};

static void __init gumstix_mmc_init(void)
{
    pxa_set_mci_info(&gumstix_mci_platform_data);
}
#else
static void __init gumstix_mmc_init(void)
{
    pr_debug("Gumstix mmc disabled\n");
}
#endif

#ifdef CONFIG_USB_PXA25X
static struct gpio_vbus_mach_info gumstix_udc_info = {
    .gpio_vbus      = GPIO_GUMSTIX_USB_GPIOn,
    .gpio_pullup        = GPIO_GUMSTIX_USB_GPIOx,
};

static struct platform_device gumstix_gpio_vbus = {
    .name   = "gpio-vbus",
    .id = -1,
    .dev    = {
        .platform_data  = &gumstix_udc_info,
    },
};

static void __init gumstix_udc_init(void)
{
    platform_device_register(&gumstix_gpio_vbus);
}
#else
static void gumstix_udc_init(void)
{
    pr_debug("Gumstix udc is disabled\n");
}
#endif

#ifdef CONFIG_BT
/* Normally, the bootloader would have enabled this 32kHz clock but many
** boards still have u-boot 1.1.4 so we check if it has been turned on and
** if not, we turn it on with a warning message. */
static void gumstix_setup_bt_clock(void)
{
    int timeout = 500;

    if (!(OSCC & OSCC_OOK))
        pr_warning("32kHz clock was not on. Bootloader may need to "
                "be updated\n");
    else
        return;

    OSCC |= OSCC_OON;
    do {
        if (OSCC & OSCC_OOK)
            break;
        udelay(1);
    } while (--timeout);
    if (!timeout)
        pr_err("Failed to start 32kHz clock\n");
}

static void __init gumstix_bluetooth_init(void)
{
    int err;

    gumstix_setup_bt_clock();

    err = gpio_request(GPIO_GUMSTIX_BTRESET, "BTRST");
    if (err) {
        pr_err("gumstix: failed request gpio for bluetooth reset\n");
        return;
    }

    err = gpio_direction_output(GPIO_GUMSTIX_BTRESET, 1);
    if (err) {
        pr_err("gumstix: can't reset bluetooth\n");
        return;
    }
    gpio_set_value(GPIO_GUMSTIX_BTRESET, 0);
    udelay(100);
    gpio_set_value(GPIO_GUMSTIX_BTRESET, 1);
}
#else
static void gumstix_bluetooth_init(void)
{
    pr_debug("Gumstix Bluetooth is disabled\n");
}
#endif

static unsigned long gumstix_pin_config[] __initdata = {
    GPIO12_32KHz,
    /* BTUART */
    GPIO42_HWUART_RXD,
    GPIO43_HWUART_TXD,
    GPIO44_HWUART_CTS,
    GPIO45_HWUART_RTS,
    /* MMC */
    GPIO6_MMC_CLK,
    GPIO53_MMC_CLK,
    GPIO8_MMC_CS0,
};

int __attribute__((weak)) am200_init(void)
{
    return 0;
}

int __attribute__((weak)) am300_init(void)
{
    return 0;
}

static void __init carrier_board_init(void)
{
    /*
     * put carrier/expansion board init here if
     * they cannot be detected programatically
     */
    am200_init();
    am300_init();
}

static void __init gumstix_init(void)
{
    pxa2xx_mfp_config(ARRAY_AND_SIZE(gumstix_pin_config));

    pxa_set_ffuart_info(NULL);
    pxa_set_btuart_info(NULL);
    pxa_set_stuart_info(NULL);
    pxa_set_hwuart_info(NULL);

    gumstix_bluetooth_init();
    gumstix_udc_init();
    gumstix_mmc_init();
    (void) platform_add_devices(devices, ARRAY_SIZE(devices));
    carrier_board_init();
}

MACHINE_START(GUMSTIX, "Gumstix")
    .atag_offset    = 0x100, /* match u-boot bi_boot_params */
    .map_io     = pxa25x_map_io,
    .nr_irqs    = PXA_NR_IRQS,
    .init_irq   = pxa25x_init_irq,
    .handle_irq = pxa25x_handle_irq,
    .timer      = &pxa_timer,
    .init_machine   = gumstix_init,
    .restart    = pxa_restart,
MACHINE_END