Logo Search packages:      
Sourcecode: linux version File versions  Download package

gumstix.c

/*
 *  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 <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 <mach/mmc.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_GADGET_PXA25X
static struct pxa2xx_udc_mach_info gumstix_udc_info __initdata = {
      .gpio_vbus        = GPIO_GUMSTIX_USB_GPIOn,
      .gpio_pullup            = GPIO_GUMSTIX_USB_GPIOx,
};

static void __init gumstix_udc_init(void)
{
      pxa_set_udc_info(&gumstix_udc_info);
}
#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,
};

00190 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));

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

MACHINE_START(GUMSTIX, "Gumstix")
      .phys_io    = 0x40000000,
      .boot_params      = 0xa0000100, /* match u-boot bi_boot_params */
      .io_pg_offst      = (io_p2v(0x40000000) >> 18) & 0xfffc,
      .map_io           = pxa_map_io,
      .init_irq   = pxa25x_init_irq,
      .timer            = &pxa_timer,
      .init_machine     = gumstix_init,
MACHINE_END

Generated by  Doxygen 1.6.0   Back to index