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#include <linux/gpio.h>
  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#include <linux/gpio.h>
  30
  31#include <mach/hardware.h>
  32
  33#include <asm/mach-types.h>
  34#include <asm/mach/arch.h>
  35#include <asm/mach/flash.h>
  36#include <asm/mach/time.h>
  37
  38#define DSMG600_SDA_PIN         5
  39#define DSMG600_SCL_PIN         4
  40
  41/* DSM-G600 Timer Setting */
  42#define DSMG600_FREQ            66000000
  43
  44/* Buttons */
  45#define DSMG600_PB_GPIO         15      /* power button */
  46#define DSMG600_RB_GPIO         3       /* reset button */
  47
  48/* Power control */
  49#define DSMG600_PO_GPIO         2       /* power off */
  50
  51/* LEDs */
  52#define DSMG600_LED_PWR_GPIO    0
  53#define DSMG600_LED_WLAN_GPIO   14
  54
  55static struct flash_platform_data dsmg600_flash_data = {
  56        .map_name               = "cfi_probe",
  57        .width                  = 2,
  58};
  59
  60static struct resource dsmg600_flash_resource = {
  61        .flags                  = IORESOURCE_MEM,
  62};
  63
  64static struct platform_device dsmg600_flash = {
  65        .name                   = "IXP4XX-Flash",
  66        .id                     = 0,
  67        .dev.platform_data      = &dsmg600_flash_data,
  68        .num_resources          = 1,
  69        .resource               = &dsmg600_flash_resource,
  70};
  71
  72static struct i2c_gpio_platform_data dsmg600_i2c_gpio_data = {
  73        .sda_pin                = DSMG600_SDA_PIN,
  74        .scl_pin                = DSMG600_SCL_PIN,
  75};
  76
  77static struct platform_device dsmg600_i2c_gpio = {
  78        .name                   = "i2c-gpio",
  79        .id                     = 0,
  80        .dev     = {
  81                .platform_data  = &dsmg600_i2c_gpio_data,
  82        },
  83};
  84
  85static struct i2c_board_info __initdata dsmg600_i2c_board_info [] = {
  86        {
  87                I2C_BOARD_INFO("pcf8563", 0x51),
  88        },
  89};
  90
  91static struct gpio_led dsmg600_led_pins[] = {
  92        {
  93                .name           = "dsmg600:green:power",
  94                .gpio           = DSMG600_LED_PWR_GPIO,
  95        },
  96        {
  97                .name           = "dsmg600:green:wlan",
  98                .gpio           = DSMG600_LED_WLAN_GPIO,
  99                .active_low     = true,
 100        },
 101};
 102
 103static struct gpio_led_platform_data dsmg600_led_data = {
 104        .num_leds               = ARRAY_SIZE(dsmg600_led_pins),
 105        .leds                   = dsmg600_led_pins,
 106};
 107
 108static struct platform_device dsmg600_leds = {
 109        .name                   = "leds-gpio",
 110        .id                     = -1,
 111        .dev.platform_data      = &dsmg600_led_data,
 112};
 113
 114static struct resource dsmg600_uart_resources[] = {
 115        {
 116                .start          = IXP4XX_UART1_BASE_PHYS,
 117                .end            = IXP4XX_UART1_BASE_PHYS + 0x0fff,
 118                .flags          = IORESOURCE_MEM,
 119        },
 120        {
 121                .start          = IXP4XX_UART2_BASE_PHYS,
 122                .end            = IXP4XX_UART2_BASE_PHYS + 0x0fff,
 123                .flags          = IORESOURCE_MEM,
 124        }
 125};
 126
 127static struct plat_serial8250_port dsmg600_uart_data[] = {
 128        {
 129                .mapbase        = IXP4XX_UART1_BASE_PHYS,
 130                .membase        = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
 131                .irq            = IRQ_IXP4XX_UART1,
 132                .flags          = UPF_BOOT_AUTOCONF,
 133                .iotype         = UPIO_MEM,
 134                .regshift       = 2,
 135                .uartclk        = IXP4XX_UART_XTAL,
 136        },
 137        {
 138                .mapbase        = IXP4XX_UART2_BASE_PHYS,
 139                .membase        = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
 140                .irq            = IRQ_IXP4XX_UART2,
 141                .flags          = UPF_BOOT_AUTOCONF,
 142                .iotype         = UPIO_MEM,
 143                .regshift       = 2,
 144                .uartclk        = IXP4XX_UART_XTAL,
 145        },
 146        { }
 147};
 148
 149static struct platform_device dsmg600_uart = {
 150        .name                   = "serial8250",
 151        .id                     = PLAT8250_DEV_PLATFORM,
 152        .dev.platform_data      = dsmg600_uart_data,
 153        .num_resources          = ARRAY_SIZE(dsmg600_uart_resources),
 154        .resource               = dsmg600_uart_resources,
 155};
 156
 157static struct platform_device *dsmg600_devices[] __initdata = {
 158        &dsmg600_i2c_gpio,
 159        &dsmg600_flash,
 160        &dsmg600_leds,
 161};
 162
 163static void dsmg600_power_off(void)
 164{
 165        /* enable the pwr cntl and drive it high */
 166        gpio_direction_output(DSMG600_PO_GPIO, 1);
 167}
 168
 169/* This is used to make sure the power-button pusher is serious.  The button
 170 * must be held until the value of this counter reaches zero.
 171 */
 172static int power_button_countdown;
 173
 174/* Must hold the button down for at least this many counts to be processed */
 175#define PBUTTON_HOLDDOWN_COUNT 4 /* 2 secs */
 176
 177static void dsmg600_power_handler(unsigned long data);
 178static DEFINE_TIMER(dsmg600_power_timer, dsmg600_power_handler, 0, 0);
 179
 180static void dsmg600_power_handler(unsigned long data)
 181{
 182        /* This routine is called twice per second to check the
 183         * state of the power button.
 184         */
 185
 186        if (gpio_get_value(DSMG600_PB_GPIO)) {
 187
 188                /* IO Pin is 1 (button pushed) */
 189                if (power_button_countdown > 0)
 190                        power_button_countdown--;
 191
 192        } else {
 193
 194                /* Done on button release, to allow for auto-power-on mods. */
 195                if (power_button_countdown == 0) {
 196                        /* Signal init to do the ctrlaltdel action,
 197                         * this will bypass init if it hasn't started
 198                         * and do a kernel_restart.
 199                         */
 200                        ctrl_alt_del();
 201
 202                        /* Change the state of the power LED to "blink" */
 203                        gpio_set_value(DSMG600_LED_PWR_GPIO, 0);
 204                } else {
 205                        power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
 206                }
 207        }
 208
 209        mod_timer(&dsmg600_power_timer, jiffies + msecs_to_jiffies(500));
 210}
 211
 212static irqreturn_t dsmg600_reset_handler(int irq, void *dev_id)
 213{
 214        /* This is the paper-clip reset, it shuts the machine down directly. */
 215        machine_power_off();
 216
 217        return IRQ_HANDLED;
 218}
 219
 220static void __init dsmg600_timer_init(void)
 221{
 222    /* The xtal on this machine is non-standard. */
 223    ixp4xx_timer_freq = DSMG600_FREQ;
 224
 225    /* Call standard timer_init function. */
 226    ixp4xx_timer_init();
 227}
 228
 229static int __init dsmg600_gpio_init(void)
 230{
 231        if (!machine_is_dsmg600())
 232                return 0;
 233
 234        gpio_request(DSMG600_RB_GPIO, "reset button");
 235        if (request_irq(gpio_to_irq(DSMG600_RB_GPIO), &dsmg600_reset_handler,
 236                IRQF_TRIGGER_LOW, "DSM-G600 reset button", NULL) < 0) {
 237
 238                printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
 239                        gpio_to_irq(DSMG600_RB_GPIO));
 240        }
 241
 242        /*
 243         * The power button on the D-Link DSM-G600 is on GPIO 15, but
 244         * it cannot handle interrupts on that GPIO line.  So we'll
 245         * have to poll it with a kernel timer.
 246         */
 247
 248        /* Make sure that the power button GPIO is set up as an input */
 249        gpio_request(DSMG600_PB_GPIO, "power button");
 250        gpio_direction_input(DSMG600_PB_GPIO);
 251        /* Request poweroff GPIO line */
 252        gpio_request(DSMG600_PO_GPIO, "power off button");
 253
 254        /* Set the initial value for the power button IRQ handler */
 255        power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
 256
 257        mod_timer(&dsmg600_power_timer, jiffies + msecs_to_jiffies(500));
 258        return 0;
 259}
 260device_initcall(dsmg600_gpio_init);
 261
 262static void __init dsmg600_init(void)
 263{
 264        ixp4xx_sys_init();
 265
 266        /* Make sure that GPIO14 and GPIO15 are not used as clocks */
 267        *IXP4XX_GPIO_GPCLKR = 0;
 268
 269        dsmg600_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
 270        dsmg600_flash_resource.end =
 271                IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
 272
 273        i2c_register_board_info(0, dsmg600_i2c_board_info,
 274                                ARRAY_SIZE(dsmg600_i2c_board_info));
 275
 276        /* The UART is required on the DSM-G600 (Redboot cannot use the
 277         * NIC) -- do it here so that it does *not* get removed if
 278         * platform_add_devices fails!
 279         */
 280        (void)platform_device_register(&dsmg600_uart);
 281
 282        platform_add_devices(dsmg600_devices, ARRAY_SIZE(dsmg600_devices));
 283
 284        pm_power_off = dsmg600_power_off;
 285}
 286
 287MACHINE_START(DSMG600, "D-Link DSM-G600 RevA")
 288        /* Maintainer: www.nslu2-linux.org */
 289        .atag_offset    = 0x100,
 290        .map_io         = ixp4xx_map_io,
 291        .init_early     = ixp4xx_init_early,
 292        .init_irq       = ixp4xx_init_irq,
 293        .init_time      = dsmg600_timer_init,
 294        .init_machine   = dsmg600_init,
 295#if defined(CONFIG_PCI)
 296        .dma_zone_size  = SZ_64M,
 297#endif
 298        .restart        = ixp4xx_restart,
 299MACHINE_END
 300