setup.c

Go to the documentation of this file.

/*
 * Board-specific setup code for the ATNGW100 Network Gateway
 *
 * Copyright (C) 2005-2006 Atmel Corporation
 *
 * 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/clk.h>
#include <linux/etherdevice.h>
#include <linux/gpio.h>
#include <linux/irq.h>
#include <linux/i2c.h>
#include <linux/i2c-gpio.h>
#include <linux/init.h>
#include <linux/linkage.h>
#include <linux/platform_device.h>
#include <linux/types.h>
#include <linux/leds.h>
#include <linux/spi/spi.h>
#include <linux/atmel-mci.h>
#include <linux/usb/atmel_usba_udc.h>

#include <asm/io.h>
#include <asm/setup.h>

#include <mach/at32ap700x.h>
#include <mach/board.h>
#include <mach/init.h>
#include <mach/portmux.h>

/* Oscillator frequencies. These are board-specific */
unsigned long at32_board_osc_rates[3] = {
    [0] = 32768,    /* 32.768 kHz on RTC osc */
    [1] = 20000000, /* 20 MHz on osc0 */
    [2] = 12000000, /* 12 MHz on osc1 */
};

/*
 * The ATNGW100 mkII is very similar to the ATNGW100. Both have the AT32AP7000
 * chip on board; the difference is that the ATNGW100 mkII has 128 MB 32-bit
 * SDRAM (the ATNGW100 has 32 MB 16-bit SDRAM) and 256 MB 16-bit NAND flash
 * (the ATNGW100 has none.)
 *
 * The RAM difference is handled by the boot loader, so the only difference we
 * end up handling here is the NAND flash, EBI pin reservation and if LCDC or
 * MACB1 should be enabled.
 */
#ifdef CONFIG_BOARD_ATNGW100_MKII
#include <linux/mtd/partitions.h>
#include <mach/smc.h>

static struct smc_timing nand_timing __initdata = {
    .ncs_read_setup     = 0,
    .nrd_setup      = 10,
    .ncs_write_setup    = 0,
    .nwe_setup      = 10,

    .ncs_read_pulse     = 30,
    .nrd_pulse      = 15,
    .ncs_write_pulse    = 30,
    .nwe_pulse      = 15,

    .read_cycle     = 30,
    .write_cycle        = 30,

    .ncs_read_recover   = 0,
    .nrd_recover        = 15,
    .ncs_write_recover  = 0,
    /* WE# high -> RE# low min 60 ns */
    .nwe_recover        = 50,
};

static struct smc_config nand_config __initdata = {
    .bus_width      = 2,
    .nrd_controlled     = 1,
    .nwe_controlled     = 1,
    .nwait_mode     = 0,
    .byte_write     = 0,
    .tdf_cycles     = 2,
    .tdf_mode       = 0,
};

static struct mtd_partition nand_partitions[] = {
    {
        .name       = "main",
        .offset     = 0x00000000,
        .size       = MTDPART_SIZ_FULL,
    },
};


static struct atmel_nand_data atngw100mkii_nand_data __initdata = {
    .cle        = 21,
    .ale        = 22,
    .rdy_pin    = GPIO_PIN_PB(28),
    .enable_pin = GPIO_PIN_PE(23),
    .bus_width_16   = true,
    .ecc_mode   = NAND_ECC_SOFT,
    .parts      = nand_partitions,
    .num_parts  = ARRAY_SIZE(nand_partitions),
};
#endif

/* Initialized by bootloader-specific startup code. */
struct tag *bootloader_tags __initdata;

struct eth_addr {
    u8 addr[6];
};
static struct eth_addr __initdata hw_addr[2];
static struct macb_platform_data __initdata eth_data[2];

static struct spi_board_info spi0_board_info[] __initdata = {
    {
        .modalias   = "mtd_dataflash",
        .max_speed_hz   = 8000000,
        .chip_select    = 0,
    },
};

static struct mci_platform_data __initdata mci0_data = {
    .slot[0] = {
        .bus_width  = 4,
#if defined(CONFIG_BOARD_ATNGW100_MKII)
        .detect_pin = GPIO_PIN_PC(25),
        .wp_pin     = GPIO_PIN_PE(22),
#else
        .detect_pin = GPIO_PIN_PC(25),
        .wp_pin     = GPIO_PIN_PE(0),
#endif
    },
};

static struct usba_platform_data atngw100_usba_data __initdata = {
#if defined(CONFIG_BOARD_ATNGW100_MKII)
    .vbus_pin   = GPIO_PIN_PE(26),
#else
    .vbus_pin   = -ENODEV,
#endif
};

/*
 * The next two functions should go away as the boot loader is
 * supposed to initialize the macb address registers with a valid
 * ethernet address. But we need to keep it around for a while until
 * we can be reasonably sure the boot loader does this.
 *
 * The phy_id is ignored as the driver will probe for it.
 */
static int __init parse_tag_ethernet(struct tag *tag)
{
    int i;

    i = tag->u.ethernet.mac_index;
    if (i < ARRAY_SIZE(hw_addr))
        memcpy(hw_addr[i].addr, tag->u.ethernet.hw_address,
               sizeof(hw_addr[i].addr));

    return 0;
}
__tagtable(ATAG_ETHERNET, parse_tag_ethernet);

static void __init set_hw_addr(struct platform_device *pdev)
{
    struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    const u8 *addr;
    void __iomem *regs;
    struct clk *pclk;

    if (!res)
        return;
    if (pdev->id >= ARRAY_SIZE(hw_addr))
        return;

    addr = hw_addr[pdev->id].addr;
    if (!is_valid_ether_addr(addr))
        return;

    /*
     * Since this is board-specific code, we'll cheat and use the
     * physical address directly as we happen to know that it's
     * the same as the virtual address.
     */
    regs = (void __iomem __force *)res->start;
    pclk = clk_get(&pdev->dev, "pclk");
    if (IS_ERR(pclk))
        return;

    clk_enable(pclk);
    __raw_writel((addr[3] << 24) | (addr[2] << 16)
             | (addr[1] << 8) | addr[0], regs + 0x98);
    __raw_writel((addr[5] << 8) | addr[4], regs + 0x9c);
    clk_disable(pclk);
    clk_put(pclk);
}

void __init setup_board(void)
{
    at32_map_usart(1, 0, 0);    /* USART 1: /dev/ttyS0, DB9 */
    at32_setup_serial_console(0);
}

static const struct gpio_led ngw_leds[] = {
    { .name = "sys", .gpio = GPIO_PIN_PA(16), .active_low = 1,
        .default_trigger = "heartbeat",
    },
    { .name = "a", .gpio = GPIO_PIN_PA(19), .active_low = 1, },
    { .name = "b", .gpio = GPIO_PIN_PE(19), .active_low = 1, },
};

static const struct gpio_led_platform_data ngw_led_data = {
    .num_leds = ARRAY_SIZE(ngw_leds),
    .leds =     (void *) ngw_leds,
};

static struct platform_device ngw_gpio_leds = {
    .name =     "leds-gpio",
    .id =       -1,
    .dev = {
        .platform_data = (void *) &ngw_led_data,
    }
};

static struct i2c_gpio_platform_data i2c_gpio_data = {
    .sda_pin        = GPIO_PIN_PA(6),
    .scl_pin        = GPIO_PIN_PA(7),
    .sda_is_open_drain  = 1,
    .scl_is_open_drain  = 1,
    .udelay         = 2,    /* close to 100 kHz */
};

static struct platform_device i2c_gpio_device = {
    .name       = "i2c-gpio",
    .id     = 0,
    .dev        = {
        .platform_data  = &i2c_gpio_data,
    },
};

static struct i2c_board_info __initdata i2c_info[] = {
    /* NOTE:  original ATtiny24 firmware is at address 0x0b */
};

static int __init atngw100_init(void)
{
    unsigned    i;

    /*
     * ATNGW100 mkII uses 32-bit SDRAM interface. Reserve the
     * SDRAM-specific pins so that nobody messes with them.
     */
#ifdef CONFIG_BOARD_ATNGW100_MKII
    at32_reserve_pin(GPIO_PIOE_BASE, ATMEL_EBI_PE_DATA_ALL);

    smc_set_timing(&nand_config, &nand_timing);
    smc_set_configuration(3, &nand_config);
    at32_add_device_nand(0, &atngw100mkii_nand_data);
#endif

    at32_add_device_usart(0);

    set_hw_addr(at32_add_device_eth(0, &eth_data[0]));
#ifndef CONFIG_BOARD_ATNGW100_MKII_LCD
    set_hw_addr(at32_add_device_eth(1, &eth_data[1]));
#endif

    at32_add_device_spi(0, spi0_board_info, ARRAY_SIZE(spi0_board_info));
    at32_add_device_mci(0, &mci0_data);
    at32_add_device_usba(0, &atngw100_usba_data);

    for (i = 0; i < ARRAY_SIZE(ngw_leds); i++) {
        at32_select_gpio(ngw_leds[i].gpio,
                AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH);
    }
    platform_device_register(&ngw_gpio_leds);

    /* all these i2c/smbus pins should have external pullups for
     * open-drain sharing among all I2C devices.  SDA and SCL do;
     * PB28/EXTINT3 (ATNGW100) and PE21 (ATNGW100 mkII) doesn't; it should
     * be SMBALERT# (for PMBus), but it's not available off-board.
     */
#ifdef CONFIG_BOARD_ATNGW100_MKII
    at32_select_periph(GPIO_PIOE_BASE, 1 << 21, 0, AT32_GPIOF_PULLUP);
#else
    at32_select_periph(GPIO_PIOB_BASE, 1 << 28, 0, AT32_GPIOF_PULLUP);
#endif
    at32_select_gpio(i2c_gpio_data.sda_pin,
        AT32_GPIOF_MULTIDRV | AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH);
    at32_select_gpio(i2c_gpio_data.scl_pin,
        AT32_GPIOF_MULTIDRV | AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH);
    platform_device_register(&i2c_gpio_device);
    i2c_register_board_info(0, i2c_info, ARRAY_SIZE(i2c_info));

    return 0;
}
postcore_initcall(atngw100_init);

static int __init atngw100_arch_init(void)
{
    /* PB30 (ATNGW100) and PE30 (ATNGW100 mkII) is the otherwise unused
     * jumper on the mainboard, with an external pullup; the jumper grounds
     * it. Use it however you like, including letting U-Boot or Linux tweak
     * boot sequences.
     */
#ifdef CONFIG_BOARD_ATNGW100_MKII
    at32_select_gpio(GPIO_PIN_PE(30), 0);
    gpio_request(GPIO_PIN_PE(30), "j15");
    gpio_direction_input(GPIO_PIN_PE(30));
    gpio_export(GPIO_PIN_PE(30), false);
#else
    at32_select_gpio(GPIO_PIN_PB(30), 0);
    gpio_request(GPIO_PIN_PB(30), "j15");
    gpio_direction_input(GPIO_PIN_PB(30));
    gpio_export(GPIO_PIN_PB(30), false);
#endif

    /* set_irq_type() after the arch_initcall for EIC has run, and
     * before the I2C subsystem could try using this IRQ.
     */
    return irq_set_irq_type(AT32_EXTINT(3), IRQ_TYPE_EDGE_FALLING);
}
arch_initcall(atngw100_arch_init);