LXR linux/arch/arm/mach-ixp4xx/dsmg600-setup.c

   1/*
   2 * DSM-G600 board-setup
   3 *
   4 * Copyright (C) 2008 Rod Whitby <rod@whitby.id.au>
   5 * Copyright (C) 2006 Tower Technologies
   6 *
   7 * based on ixdp425-setup.c:
   8 *      Copyright (C) 2003-2004 MontaVista Software, Inc.
   9 * based on nslu2-power.c:
  10 *      Copyright (C) 2005 Tower Technologies
  11 * based on nslu2-io.c:
  12 *      Copyright (C) 2004 Karen Spearel
  13 *
  14 * Author: Alessandro Zummo <a.zummo@towertech.it>
  15 * Author: Michael Westerhof <mwester@dls.net>
  16 * Author: Rod Whitby <rod@whitby.id.au>
  17 * Maintainers: http://www.nslu2-linux.org/
  18 */
  19
  20#include <linux/irq.h>
  21#include <linux/jiffies.h>
  22#include <linux/timer.h>
  23#include <linux/serial.h>
  24#include <linux/serial_8250.h>
  25#include <linux/leds.h>
  26#include <linux/reboot.h>
  27#include <linux/i2c.h>
  28#include <linux/i2c-gpio.h>
  29
  30#include <asm/mach-types.h>
  31#include <asm/mach/arch.h>
  32#include <asm/mach/flash.h>
  33#include <asm/mach/time.h>
  34#include <asm/gpio.h>
  35
  36static struct flash_platform_data dsmg600_flash_data = {
  37        .map_name               = "cfi_probe",
  38        .width                  = 2,
  39};
  40
  41static struct resource dsmg600_flash_resource = {
  42        .flags                  = IORESOURCE_MEM,
  43};
  44
  45static struct platform_device dsmg600_flash = {
  46        .name                   = "IXP4XX-Flash",
  47        .id                     = 0,
  48        .dev.platform_data      = &dsmg600_flash_data,
  49        .num_resources          = 1,
  50        .resource               = &dsmg600_flash_resource,
  51};
  52
  53static struct i2c_gpio_platform_data dsmg600_i2c_gpio_data = {
  54        .sda_pin                = DSMG600_SDA_PIN,
  55        .scl_pin                = DSMG600_SCL_PIN,
  56};
  57
  58static struct platform_device dsmg600_i2c_gpio = {
  59        .name                   = "i2c-gpio",
  60        .id                     = 0,
  61        .dev     = {
  62                .platform_data  = &dsmg600_i2c_gpio_data,
  63        },
  64};
  65
  66static struct i2c_board_info __initdata dsmg600_i2c_board_info [] = {
  67        {
  68                I2C_BOARD_INFO("pcf8563", 0x51),
  69        },
  70};
  71
  72static struct gpio_led dsmg600_led_pins[] = {
  73        {
  74                .name           = "dsmg600:green:power",
  75                .gpio           = DSMG600_LED_PWR_GPIO,
  76        },
  77        {
  78                .name           = "dsmg600:green:wlan",
  79                .gpio           = DSMG600_LED_WLAN_GPIO,
  80                .active_low     = true,
  81        },
  82};
  83
  84static struct gpio_led_platform_data dsmg600_led_data = {
  85        .num_leds               = ARRAY_SIZE(dsmg600_led_pins),
  86        .leds                   = dsmg600_led_pins,
  87};
  88
  89static struct platform_device dsmg600_leds = {
  90        .name                   = "leds-gpio",
  91        .id                     = -1,
  92        .dev.platform_data      = &dsmg600_led_data,
  93};
  94
  95static struct resource dsmg600_uart_resources[] = {
  96        {
  97                .start          = IXP4XX_UART1_BASE_PHYS,
  98                .end            = IXP4XX_UART1_BASE_PHYS + 0x0fff,
  99                .flags          = IORESOURCE_MEM,
 100        },
 101        {
 102                .start          = IXP4XX_UART2_BASE_PHYS,
 103                .end            = IXP4XX_UART2_BASE_PHYS + 0x0fff,
 104                .flags          = IORESOURCE_MEM,
 105        }
 106};
 107
 108static struct plat_serial8250_port dsmg600_uart_data[] = {
 109        {
 110                .mapbase        = IXP4XX_UART1_BASE_PHYS,
 111                .membase        = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
 112                .irq            = IRQ_IXP4XX_UART1,
 113                .flags          = UPF_BOOT_AUTOCONF,
 114                .iotype         = UPIO_MEM,
 115                .regshift       = 2,
 116                .uartclk        = IXP4XX_UART_XTAL,
 117        },
 118        {
 119                .mapbase        = IXP4XX_UART2_BASE_PHYS,
 120                .membase        = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
 121                .irq            = IRQ_IXP4XX_UART2,
 122                .flags          = UPF_BOOT_AUTOCONF,
 123                .iotype         = UPIO_MEM,
 124                .regshift       = 2,
 125                .uartclk        = IXP4XX_UART_XTAL,
 126        },
 127        { }
 128};
 129
 130static struct platform_device dsmg600_uart = {
 131        .name                   = "serial8250",
 132        .id                     = PLAT8250_DEV_PLATFORM,
 133        .dev.platform_data      = dsmg600_uart_data,
 134        .num_resources          = ARRAY_SIZE(dsmg600_uart_resources),
 135        .resource               = dsmg600_uart_resources,
 136};
 137
 138static struct platform_device *dsmg600_devices[] __initdata = {
 139        &dsmg600_i2c_gpio,
 140        &dsmg600_flash,
 141        &dsmg600_leds,
 142};
 143
 144static void dsmg600_power_off(void)
 145{
 146        /* enable the pwr cntl gpio */
 147        gpio_line_config(DSMG600_PO_GPIO, IXP4XX_GPIO_OUT);
 148
 149        /* poweroff */
 150        gpio_line_set(DSMG600_PO_GPIO, IXP4XX_GPIO_HIGH);
 151}
 152
 153/* This is used to make sure the power-button pusher is serious.  The button
 154 * must be held until the value of this counter reaches zero.
 155 */
 156static int power_button_countdown;
 157
 158/* Must hold the button down for at least this many counts to be processed */
 159#define PBUTTON_HOLDDOWN_COUNT 4 /* 2 secs */
 160
 161static void dsmg600_power_handler(unsigned long data);
 162static DEFINE_TIMER(dsmg600_power_timer, dsmg600_power_handler, 0, 0);
 163
 164static void dsmg600_power_handler(unsigned long data)
 165{
 166        /* This routine is called twice per second to check the
 167         * state of the power button.
 168         */
 169
 170        if (gpio_get_value(DSMG600_PB_GPIO)) {
 171
 172                /* IO Pin is 1 (button pushed) */
 173                if (power_button_countdown > 0)
 174                        power_button_countdown--;
 175
 176        } else {
 177
 178                /* Done on button release, to allow for auto-power-on mods. */
 179                if (power_button_countdown == 0) {
 180                        /* Signal init to do the ctrlaltdel action,
 181                         * this will bypass init if it hasn't started
 182                         * and do a kernel_restart.
 183                         */
 184                        ctrl_alt_del();
 185
 186                        /* Change the state of the power LED to "blink" */
 187                        gpio_line_set(DSMG600_LED_PWR_GPIO, IXP4XX_GPIO_LOW);
 188                } else {
 189                        power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
 190                }
 191        }
 192
 193        mod_timer(&dsmg600_power_timer, jiffies + msecs_to_jiffies(500));
 194}
 195
 196static irqreturn_t dsmg600_reset_handler(int irq, void *dev_id)
 197{
 198        /* This is the paper-clip reset, it shuts the machine down directly. */
 199        machine_power_off();
 200
 201        return IRQ_HANDLED;
 202}
 203
 204static void __init dsmg600_timer_init(void)
 205{
 206    /* The xtal on this machine is non-standard. */
 207    ixp4xx_timer_freq = DSMG600_FREQ;
 208
 209    /* Call standard timer_init function. */
 210    ixp4xx_timer_init();
 211}
 212
 213static struct sys_timer dsmg600_timer = {
 214    .init   = dsmg600_timer_init,
 215};
 216
 217static void __init dsmg600_init(void)
 218{
 219        ixp4xx_sys_init();
 220
 221        /* Make sure that GPIO14 and GPIO15 are not used as clocks */
 222        *IXP4XX_GPIO_GPCLKR = 0;
 223
 224        dsmg600_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
 225        dsmg600_flash_resource.end =
 226                IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
 227
 228        i2c_register_board_info(0, dsmg600_i2c_board_info,
 229                                ARRAY_SIZE(dsmg600_i2c_board_info));
 230
 231        /* The UART is required on the DSM-G600 (Redboot cannot use the
 232         * NIC) -- do it here so that it does *not* get removed if
 233         * platform_add_devices fails!
 234         */
 235        (void)platform_device_register(&dsmg600_uart);
 236
 237        platform_add_devices(dsmg600_devices, ARRAY_SIZE(dsmg600_devices));
 238
 239        pm_power_off = dsmg600_power_off;
 240
 241        if (request_irq(gpio_to_irq(DSMG600_RB_GPIO), &dsmg600_reset_handler,
 242                IRQF_DISABLED | IRQF_TRIGGER_LOW,
 243                "DSM-G600 reset button", NULL) < 0) {
 244
 245                printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
 246                        gpio_to_irq(DSMG600_RB_GPIO));
 247        }
 248
 249        /* The power button on the D-Link DSM-G600 is on GPIO 15, but
 250         * it cannot handle interrupts on that GPIO line.  So we'll
 251         * have to poll it with a kernel timer.
 252         */
 253
 254        /* Make sure that the power button GPIO is set up as an input */
 255        gpio_line_config(DSMG600_PB_GPIO, IXP4XX_GPIO_IN);
 256
 257        /* Set the initial value for the power button IRQ handler */
 258        power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
 259
 260        mod_timer(&dsmg600_power_timer, jiffies + msecs_to_jiffies(500));
 261}
 262
 263MACHINE_START(DSMG600, "D-Link DSM-G600 RevA")
 264        /* Maintainer: www.nslu2-linux.org */
 265        .phys_io        = IXP4XX_PERIPHERAL_BASE_PHYS,
 266        .io_pg_offst    = ((IXP4XX_PERIPHERAL_BASE_VIRT) >> 18) & 0xFFFC,
 267        .boot_params    = 0x00000100,
 268        .map_io         = ixp4xx_map_io,
 269        .init_irq       = ixp4xx_init_irq,
 270        .timer          = &dsmg600_timer,
 271        .init_machine   = dsmg600_init,
 272MACHINE_END
 273