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
  30#include <mach/hardware.h>
  31
  32#include <asm/mach-types.h>
  33#include <asm/mach/arch.h>
  34#include <asm/mach/flash.h>
  35#include <asm/mach/time.h>
  36
  37#define DSMG600_SDA_PIN         5
  38#define DSMG600_SCL_PIN         4
  39
  40/* DSM-G600 Timer Setting */
  41#define DSMG600_FREQ            66000000
  42
  43/* Buttons */
  44#define DSMG600_PB_GPIO         15      /* power button */
  45#define DSMG600_RB_GPIO         3       /* reset button */
  46
  47/* Power control */
  48#define DSMG600_PO_GPIO         2       /* power off */
  49
  50/* LEDs */
  51#define DSMG600_LED_PWR_GPIO    0
  52#define DSMG600_LED_WLAN_GPIO   14
  53
  54static struct flash_platform_data dsmg600_flash_data = {
  55        .map_name               = "cfi_probe",
  56        .width                  = 2,
  57};
  58
  59static struct resource dsmg600_flash_resource = {
  60        .flags                  = IORESOURCE_MEM,
  61};
  62
  63static struct platform_device dsmg600_flash = {
  64        .name                   = "IXP4XX-Flash",
  65        .id                     = 0,
  66        .dev.platform_data      = &dsmg600_flash_data,
  67        .num_resources          = 1,
  68        .resource               = &dsmg600_flash_resource,
  69};
  70
  71static struct i2c_gpio_platform_data dsmg600_i2c_gpio_data = {
  72        .sda_pin                = DSMG600_SDA_PIN,
  73        .scl_pin                = DSMG600_SCL_PIN,
  74};
  75
  76static struct platform_device dsmg600_i2c_gpio = {
  77        .name                   = "i2c-gpio",
  78        .id                     = 0,
  79        .dev     = {
  80                .platform_data  = &dsmg600_i2c_gpio_data,
  81        },
  82};
  83
  84static struct i2c_board_info __initdata dsmg600_i2c_board_info [] = {
  85        {
  86                I2C_BOARD_INFO("pcf8563", 0x51),
  87        },
  88};
  89
  90static struct gpio_led dsmg600_led_pins[] = {
  91        {
  92                .name           = "dsmg600:green:power",
  93                .gpio           = DSMG600_LED_PWR_GPIO,
  94        },
  95        {
  96                .name           = "dsmg600:green:wlan",
  97                .gpio           = DSMG600_LED_WLAN_GPIO,
  98                .active_low     = true,
  99        },
 100};
 101
 102static struct gpio_led_platform_data dsmg600_led_data = {
 103        .num_leds               = ARRAY_SIZE(dsmg600_led_pins),
 104        .leds                   = dsmg600_led_pins,
 105};
 106
 107static struct platform_device dsmg600_leds = {
 108        .name                   = "leds-gpio",
 109        .id                     = -1,
 110        .dev.platform_data      = &dsmg600_led_data,
 111};
 112
 113static struct resource dsmg600_uart_resources[] = {
 114        {
 115                .start          = IXP4XX_UART1_BASE_PHYS,
 116                .end            = IXP4XX_UART1_BASE_PHYS + 0x0fff,
 117                .flags          = IORESOURCE_MEM,
 118        },
 119        {
 120                .start          = IXP4XX_UART2_BASE_PHYS,
 121                .end            = IXP4XX_UART2_BASE_PHYS + 0x0fff,
 122                .flags          = IORESOURCE_MEM,
 123        }
 124};
 125
 126static struct plat_serial8250_port dsmg600_uart_data[] = {
 127        {
 128                .mapbase        = IXP4XX_UART1_BASE_PHYS,
 129                .membase        = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
 130                .irq            = IRQ_IXP4XX_UART1,
 131                .flags          = UPF_BOOT_AUTOCONF,
 132                .iotype         = UPIO_MEM,
 133                .regshift       = 2,
 134                .uartclk        = IXP4XX_UART_XTAL,
 135        },
 136        {
 137                .mapbase        = IXP4XX_UART2_BASE_PHYS,
 138                .membase        = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
 139                .irq            = IRQ_IXP4XX_UART2,
 140                .flags          = UPF_BOOT_AUTOCONF,
 141                .iotype         = UPIO_MEM,
 142                .regshift       = 2,
 143                .uartclk        = IXP4XX_UART_XTAL,
 144        },
 145        { }
 146};
 147
 148static struct platform_device dsmg600_uart = {
 149        .name                   = "serial8250",
 150        .id                     = PLAT8250_DEV_PLATFORM,
 151        .dev.platform_data      = dsmg600_uart_data,
 152        .num_resources          = ARRAY_SIZE(dsmg600_uart_resources),
 153        .resource               = dsmg600_uart_resources,
 154};
 155
 156static struct platform_device *dsmg600_devices[] __initdata = {
 157        &dsmg600_i2c_gpio,
 158        &dsmg600_flash,
 159        &dsmg600_leds,
 160};
 161
 162static void dsmg600_power_off(void)
 163{
 164        /* enable the pwr cntl gpio */
 165        gpio_line_config(DSMG600_PO_GPIO, IXP4XX_GPIO_OUT);
 166
 167        /* poweroff */
 168        gpio_line_set(DSMG600_PO_GPIO, IXP4XX_GPIO_HIGH);
 169}
 170
 171/* This is used to make sure the power-button pusher is serious.  The button
 172 * must be held until the value of this counter reaches zero.
 173 */
 174static int power_button_countdown;
 175
 176/* Must hold the button down for at least this many counts to be processed */
 177#define PBUTTON_HOLDDOWN_COUNT 4 /* 2 secs */
 178
 179static void dsmg600_power_handler(unsigned long data);
 180static DEFINE_TIMER(dsmg600_power_timer, dsmg600_power_handler, 0, 0);
 181
 182static void dsmg600_power_handler(unsigned long data)
 183{
 184        /* This routine is called twice per second to check the
 185         * state of the power button.
 186         */
 187
 188        if (gpio_get_value(DSMG600_PB_GPIO)) {
 189
 190                /* IO Pin is 1 (button pushed) */
 191                if (power_button_countdown > 0)
 192                        power_button_countdown--;
 193
 194        } else {
 195
 196                /* Done on button release, to allow for auto-power-on mods. */
 197                if (power_button_countdown == 0) {
 198                        /* Signal init to do the ctrlaltdel action,
 199                         * this will bypass init if it hasn't started
 200                         * and do a kernel_restart.
 201                         */
 202                        ctrl_alt_del();
 203
 204                        /* Change the state of the power LED to "blink" */
 205                        gpio_line_set(DSMG600_LED_PWR_GPIO, IXP4XX_GPIO_LOW);
 206                } else {
 207                        power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
 208                }
 209        }
 210
 211        mod_timer(&dsmg600_power_timer, jiffies + msecs_to_jiffies(500));
 212}
 213
 214static irqreturn_t dsmg600_reset_handler(int irq, void *dev_id)
 215{
 216        /* This is the paper-clip reset, it shuts the machine down directly. */
 217        machine_power_off();
 218
 219        return IRQ_HANDLED;
 220}
 221
 222static void __init dsmg600_timer_init(void)
 223{
 224    /* The xtal on this machine is non-standard. */
 225    ixp4xx_timer_freq = DSMG600_FREQ;
 226
 227    /* Call standard timer_init function. */
 228    ixp4xx_timer_init();
 229}
 230
 231static void __init dsmg600_init(void)
 232{
 233        ixp4xx_sys_init();
 234
 235        /* Make sure that GPIO14 and GPIO15 are not used as clocks */
 236        *IXP4XX_GPIO_GPCLKR = 0;
 237
 238        dsmg600_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
 239        dsmg600_flash_resource.end =
 240                IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
 241
 242        i2c_register_board_info(0, dsmg600_i2c_board_info,
 243                                ARRAY_SIZE(dsmg600_i2c_board_info));
 244
 245        /* The UART is required on the DSM-G600 (Redboot cannot use the
 246         * NIC) -- do it here so that it does *not* get removed if
 247         * platform_add_devices fails!
 248         */
 249        (void)platform_device_register(&dsmg600_uart);
 250
 251        platform_add_devices(dsmg600_devices, ARRAY_SIZE(dsmg600_devices));
 252
 253        pm_power_off = dsmg600_power_off;
 254
 255        if (request_irq(gpio_to_irq(DSMG600_RB_GPIO), &dsmg600_reset_handler,
 256                IRQF_DISABLED | IRQF_TRIGGER_LOW,
 257                "DSM-G600 reset button", NULL) < 0) {
 258
 259                printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
 260                        gpio_to_irq(DSMG600_RB_GPIO));
 261        }
 262
 263        /* The power button on the D-Link DSM-G600 is on GPIO 15, but
 264         * it cannot handle interrupts on that GPIO line.  So we'll
 265         * have to poll it with a kernel timer.
 266         */
 267
 268        /* Make sure that the power button GPIO is set up as an input */
 269        gpio_line_config(DSMG600_PB_GPIO, IXP4XX_GPIO_IN);
 270
 271        /* Set the initial value for the power button IRQ handler */
 272        power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
 273
 274        mod_timer(&dsmg600_power_timer, jiffies + msecs_to_jiffies(500));
 275}
 276
 277MACHINE_START(DSMG600, "D-Link DSM-G600 RevA")
 278        /* Maintainer: www.nslu2-linux.org */
 279        .atag_offset    = 0x100,
 280        .map_io         = ixp4xx_map_io,
 281        .init_early     = ixp4xx_init_early,
 282        .init_irq       = ixp4xx_init_irq,
 283        .init_time      = dsmg600_timer_init,
 284        .init_machine   = dsmg600_init,
 285#if defined(CONFIG_PCI)
 286        .dma_zone_size  = SZ_64M,
 287#endif
 288        .restart        = ixp4xx_restart,
 289MACHINE_END
 290