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board-evm.c

/*
 * TI DaVinci EVM board support
 *
 * Author: Kevin Hilman, MontaVista Software, Inc. <source@mvista.com>
 *
 * 2007 (c) MontaVista Software, Inc. This file is licensed under
 * the terms of the GNU General Public License version 2. This program
 * is licensed "as is" without any warranty of any kind, whether express
 * or implied.
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/dma-mapping.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/leds.h>

#include <linux/i2c.h>
#include <linux/i2c/pcf857x.h>
#include <linux/i2c/at24.h>

#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/mtd/physmap.h>
#include <linux/io.h>

#include <asm/setup.h>
#include <asm/mach-types.h>

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

#include <mach/hardware.h>
#include <mach/common.h>
#include <mach/i2c.h>

/* other misc. init functions */
void __init davinci_psc_init(void);
void __init davinci_irq_init(void);
void __init davinci_map_common_io(void);
void __init davinci_init_common_hw(void);

#if defined(CONFIG_MTD_PHYSMAP) || \
    defined(CONFIG_MTD_PHYSMAP_MODULE)

static struct mtd_partition davinci_evm_norflash_partitions[] = {
      /* bootloader (U-Boot, etc) in first 4 sectors */
      {
            .name       = "bootloader",
            .offset           = 0,
            .size       = 4 * SZ_64K,
            .mask_flags = MTD_WRITEABLE, /* force read-only */
      },
      /* bootloader params in the next 1 sectors */
      {
            .name       = "params",
            .offset           = MTDPART_OFS_APPEND,
            .size       = SZ_64K,
            .mask_flags = 0,
      },
      /* kernel */
      {
            .name       = "kernel",
            .offset           = MTDPART_OFS_APPEND,
            .size       = SZ_2M,
            .mask_flags = 0
      },
      /* file system */
      {
            .name       = "filesystem",
            .offset           = MTDPART_OFS_APPEND,
            .size       = MTDPART_SIZ_FULL,
            .mask_flags = 0
      }
};

static struct physmap_flash_data davinci_evm_norflash_data = {
      .width            = 2,
      .parts            = davinci_evm_norflash_partitions,
      .nr_parts   = ARRAY_SIZE(davinci_evm_norflash_partitions),
};

/* NOTE: CFI probe will correctly detect flash part as 32M, but EMIF
 * limits addresses to 16M, so using addresses past 16M will wrap */
static struct resource davinci_evm_norflash_resource = {
      .start            = DAVINCI_ASYNC_EMIF_DATA_CE0_BASE,
      .end        = DAVINCI_ASYNC_EMIF_DATA_CE0_BASE + SZ_16M - 1,
      .flags            = IORESOURCE_MEM,
};

static struct platform_device davinci_evm_norflash_device = {
      .name       = "physmap-flash",
      .id         = 0,
      .dev        = {
            .platform_data    = &davinci_evm_norflash_data,
      },
      .num_resources    = 1,
      .resource   = &davinci_evm_norflash_resource,
};

#endif

#if defined(CONFIG_BLK_DEV_PALMCHIP_BK3710) || \
    defined(CONFIG_BLK_DEV_PALMCHIP_BK3710_MODULE)

static struct resource ide_resources[] = {
      {
            .start          = DAVINCI_CFC_ATA_BASE,
            .end            = DAVINCI_CFC_ATA_BASE + 0x7ff,
            .flags          = IORESOURCE_MEM,
      },
      {
            .start          = IRQ_IDE,
            .end            = IRQ_IDE,
            .flags          = IORESOURCE_IRQ,
      },
};

static u64 ide_dma_mask = DMA_32BIT_MASK;

static struct platform_device ide_dev = {
      .name           = "palm_bk3710",
      .id             = -1,
      .resource       = ide_resources,
      .num_resources  = ARRAY_SIZE(ide_resources),
      .dev = {
            .dma_mask         = &ide_dma_mask,
            .coherent_dma_mask      = DMA_32BIT_MASK,
      },
};

#endif

/*----------------------------------------------------------------------*/

/*
 * I2C GPIO expanders
 */

#define PCF_Uxx_BASE(x) (DAVINCI_N_GPIO + ((x) * 8))


/* U2 -- LEDs */

static struct gpio_led evm_leds[] = {
      { .name = "DS8", .active_low = 1,
            .default_trigger = "heartbeat", },
      { .name = "DS7", .active_low = 1, },
      { .name = "DS6", .active_low = 1, },
      { .name = "DS5", .active_low = 1, },
      { .name = "DS4", .active_low = 1, },
      { .name = "DS3", .active_low = 1, },
      { .name = "DS2", .active_low = 1,
            .default_trigger = "mmc0", },
      { .name = "DS1", .active_low = 1,
            .default_trigger = "ide-disk", },
};

static const struct gpio_led_platform_data evm_led_data = {
      .num_leds   = ARRAY_SIZE(evm_leds),
      .leds       = evm_leds,
};

static struct platform_device *evm_led_dev;

static int
evm_led_setup(struct i2c_client *client, int gpio, unsigned ngpio, void *c)
{
      struct gpio_led *leds = evm_leds;
      int status;

      while (ngpio--) {
            leds->gpio = gpio++;
            leds++;
      }

      /* what an extremely annoying way to be forced to handle
       * device unregistration ...
       */
      evm_led_dev = platform_device_alloc("leds-gpio", 0);
      platform_device_add_data(evm_led_dev,
                  &evm_led_data, sizeof evm_led_data);

      evm_led_dev->dev.parent = &client->dev;
      status = platform_device_add(evm_led_dev);
      if (status < 0) {
            platform_device_put(evm_led_dev);
            evm_led_dev = NULL;
      }
      return status;
}

static int
evm_led_teardown(struct i2c_client *client, int gpio, unsigned ngpio, void *c)
{
      if (evm_led_dev) {
            platform_device_unregister(evm_led_dev);
            evm_led_dev = NULL;
      }
      return 0;
}

static struct pcf857x_platform_data pcf_data_u2 = {
      .gpio_base  = PCF_Uxx_BASE(0),
      .setup            = evm_led_setup,
      .teardown   = evm_led_teardown,
};


/* U18 - A/V clock generator and user switch */

static int sw_gpio;

static ssize_t
sw_show(struct device *d, struct device_attribute *a, char *buf)
{
      char *s = gpio_get_value_cansleep(sw_gpio) ? "on\n" : "off\n";

      strcpy(buf, s);
      return strlen(s);
}

static DEVICE_ATTR(user_sw, S_IRUGO, sw_show, NULL);

static int
evm_u18_setup(struct i2c_client *client, int gpio, unsigned ngpio, void *c)
{
      int   status;

      /* export dip switch option */
      sw_gpio = gpio + 7;
      status = gpio_request(sw_gpio, "user_sw");
      if (status == 0)
            status = gpio_direction_input(sw_gpio);
      if (status == 0)
            status = device_create_file(&client->dev, &dev_attr_user_sw);
      else
            gpio_free(sw_gpio);
      if (status != 0)
            sw_gpio = -EINVAL;

      /* audio PLL:  48 kHz (vs 44.1 or 32), single rate (vs double) */
      gpio_request(gpio + 3, "pll_fs2");
      gpio_direction_output(gpio + 3, 0);

      gpio_request(gpio + 2, "pll_fs1");
      gpio_direction_output(gpio + 2, 0);

      gpio_request(gpio + 1, "pll_sr");
      gpio_direction_output(gpio + 1, 0);

      return 0;
}

static int
evm_u18_teardown(struct i2c_client *client, int gpio, unsigned ngpio, void *c)
{
      gpio_free(gpio + 1);
      gpio_free(gpio + 2);
      gpio_free(gpio + 3);

      if (sw_gpio > 0) {
            device_remove_file(&client->dev, &dev_attr_user_sw);
            gpio_free(sw_gpio);
      }
      return 0;
}

static struct pcf857x_platform_data pcf_data_u18 = {
      .gpio_base  = PCF_Uxx_BASE(1),
      .n_latch    = (1 << 3) | (1 << 2) | (1 << 1),
      .setup            = evm_u18_setup,
      .teardown   = evm_u18_teardown,
};


/* U35 - various I/O signals used to manage USB, CF, ATA, etc */

static int
evm_u35_setup(struct i2c_client *client, int gpio, unsigned ngpio, void *c)
{
      /* p0 = nDRV_VBUS (initial:  don't supply it) */
      gpio_request(gpio + 0, "nDRV_VBUS");
      gpio_direction_output(gpio + 0, 1);

      /* p1 = VDDIMX_EN */
      gpio_request(gpio + 1, "VDDIMX_EN");
      gpio_direction_output(gpio + 1, 1);

      /* p2 = VLYNQ_EN */
      gpio_request(gpio + 2, "VLYNQ_EN");
      gpio_direction_output(gpio + 2, 1);

      /* p3 = n3V3_CF_RESET (initial: stay in reset) */
      gpio_request(gpio + 3, "nCF_RESET");
      gpio_direction_output(gpio + 3, 0);

      /* (p4 unused) */

      /* p5 = 1V8_WLAN_RESET (initial: stay in reset) */
      gpio_request(gpio + 5, "WLAN_RESET");
      gpio_direction_output(gpio + 5, 1);

      /* p6 = nATA_SEL (initial: select) */
      gpio_request(gpio + 6, "nATA_SEL");
      gpio_direction_output(gpio + 6, 0);

      /* p7 = nCF_SEL (initial: deselect) */
      gpio_request(gpio + 7, "nCF_SEL");
      gpio_direction_output(gpio + 7, 1);

      return 0;
}

static int
evm_u35_teardown(struct i2c_client *client, int gpio, unsigned ngpio, void *c)
{
      gpio_free(gpio + 7);
      gpio_free(gpio + 6);
      gpio_free(gpio + 5);
      gpio_free(gpio + 3);
      gpio_free(gpio + 2);
      gpio_free(gpio + 1);
      gpio_free(gpio + 0);
      return 0;
}

static struct pcf857x_platform_data pcf_data_u35 = {
      .gpio_base  = PCF_Uxx_BASE(2),
      .setup            = evm_u35_setup,
      .teardown   = evm_u35_teardown,
};

/*----------------------------------------------------------------------*/

/* Most of this EEPROM is unused, but U-Boot uses some data:
 *  - 0x7f00, 6 bytes Ethernet Address
 *  - 0x0039, 1 byte NTSC vs PAL (bit 0x80 == PAL)
 *  - ... newer boards may have more
 */
static struct at24_platform_data eeprom_info = {
      .byte_len   = (256*1024) / 8,
      .page_size  = 64,
      .flags            = AT24_FLAG_ADDR16,
};

static struct i2c_board_info __initdata i2c_info[] =  {
      {
            I2C_BOARD_INFO("pcf8574", 0x38),
            .platform_data    = &pcf_data_u2,
      },
      {
            I2C_BOARD_INFO("pcf8574", 0x39),
            .platform_data    = &pcf_data_u18,
      },
      {
            I2C_BOARD_INFO("pcf8574", 0x3a),
            .platform_data    = &pcf_data_u35,
      },
      {
            I2C_BOARD_INFO("24c256", 0x50),
            .platform_data    = &eeprom_info,
      },
      /* ALSO:
       * - tvl320aic33 audio codec (0x1b)
       * - msp430 microcontroller (0x23)
       * - tvp5146 video decoder (0x5d)
       */
};

/* The msp430 uses a slow bitbanged I2C implementation (ergo 20 KHz),
 * which requires 100 usec of idle bus after i2c writes sent to it.
 */
static struct davinci_i2c_platform_data i2c_pdata = {
      .bus_freq   = 20 /* kHz */,
      .bus_delay  = 100 /* usec */,
};

static void __init evm_init_i2c(void)
{
      davinci_init_i2c(&i2c_pdata);
      i2c_register_board_info(1, i2c_info, ARRAY_SIZE(i2c_info));
}

static struct platform_device *davinci_evm_devices[] __initdata = {
#if defined(CONFIG_MTD_PHYSMAP) || \
    defined(CONFIG_MTD_PHYSMAP_MODULE)
      &davinci_evm_norflash_device,
#endif
#if defined(CONFIG_BLK_DEV_PALMCHIP_BK3710) || \
    defined(CONFIG_BLK_DEV_PALMCHIP_BK3710_MODULE)
      &ide_dev,
#endif
};

static void __init
davinci_evm_map_io(void)
{
      davinci_map_common_io();
}

static __init void davinci_evm_init(void)
{
      davinci_psc_init();

#if defined(CONFIG_BLK_DEV_PALMCHIP_BK3710) || \
    defined(CONFIG_BLK_DEV_PALMCHIP_BK3710_MODULE)
#if defined(CONFIG_MTD_PHYSMAP) || \
    defined(CONFIG_MTD_PHYSMAP_MODULE)
      printk(KERN_WARNING "WARNING: both IDE and NOR flash are enabled, "
             "but share pins.\n\t Disable IDE for NOR support.\n");
#endif
#endif

      platform_add_devices(davinci_evm_devices,
                       ARRAY_SIZE(davinci_evm_devices));
      evm_init_i2c();

      /* irlml6401 sustains over 3A, switches 5V in under 8 msec */
      setup_usb(500, 8);
}

static __init void davinci_evm_irq_init(void)
{
      davinci_init_common_hw();
      davinci_irq_init();
}

MACHINE_START(DAVINCI_EVM, "DaVinci EVM")
      /* Maintainer: MontaVista Software <source@mvista.com> */
      .phys_io      = IO_PHYS,
      .io_pg_offst  = (__IO_ADDRESS(IO_PHYS) >> 18) & 0xfffc,
      .boot_params  = (DAVINCI_DDR_BASE + 0x100),
      .map_io           = davinci_evm_map_io,
      .init_irq     = davinci_evm_irq_init,
      .timer            = &davinci_timer,
      .init_machine = davinci_evm_init,
MACHINE_END

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