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 <asm/mach-types.h>
  31 #include <asm/mach/arch.h>
  32 #include <asm/mach/flash.h>
  33 #include <asm/mach/time.h>
  34
  35 #define DSMG600_SDA_PIN         5
  36 #define DSMG600_SCL_PIN         4
  37
  38 /* DSM-G600 Timer Setting */
  39 #define DSMG600_FREQ            66000000
  40
  41 /* Buttons */
  42 #define DSMG600_PB_GPIO         15      /* power button */
  43 #define DSMG600_RB_GPIO         3       /* reset button */
  44
  45 /* Power control */
  46 #define DSMG600_PO_GPIO         2       /* power off */
  47
  48 /* LEDs */
  49 #define DSMG600_LED_PWR_GPIO    0
  50 #define DSMG600_LED_WLAN_GPIO   14
  51
  52 static struct flash_platform_data dsmg600_flash_data = {
  53         .map_name               = "cfi_probe",
  54         .width                  = 2,
  55 };
  56
  57 static struct resource dsmg600_flash_resource = {
  58         .flags                  = IORESOURCE_MEM,
  59 };
  60
  61 static struct platform_device dsmg600_flash = {
  62         .name                   = "IXP4XX-Flash",
  63         .id                     = 0,
  64         .dev.platform_data      = &dsmg600_flash_data,
  65         .num_resources          = 1,
  66         .resource               = &dsmg600_flash_resource,
  67 };
  68
  69 static struct i2c_gpio_platform_data dsmg600_i2c_gpio_data = {
  70         .sda_pin                = DSMG600_SDA_PIN,
  71         .scl_pin                = DSMG600_SCL_PIN,
  72 };
  73
  74 static struct platform_device dsmg600_i2c_gpio = {
  75         .name                   = "i2c-gpio",
  76         .id                     = 0,
  77         .dev     = {
  78                 .platform_data  = &dsmg600_i2c_gpio_data,
  79         },
  80 };
  81
  82 static struct i2c_board_info __initdata dsmg600_i2c_board_info [] = {
  83         {
  84                 I2C_BOARD_INFO("pcf8563", 0x51),
  85         },
  86 };
  87
  88 static struct gpio_led dsmg600_led_pins[] = {
  89         {
  90                 .name           = "dsmg600:green:power",
  91                 .gpio           = DSMG600_LED_PWR_GPIO,
  92         },
  93         {
  94                 .name           = "dsmg600:green:wlan",
  95                 .gpio           = DSMG600_LED_WLAN_GPIO,
  96                 .active_low     = true,
  97         },
  98 };
  99
 100 static struct gpio_led_platform_data dsmg600_led_data = {
 101         .num_leds               = ARRAY_SIZE(dsmg600_led_pins),
 102         .leds                   = dsmg600_led_pins,
 103 };
 104
 105 static struct platform_device dsmg600_leds = {
 106         .name                   = "leds-gpio",
 107         .id                     = -1,
 108         .dev.platform_data      = &dsmg600_led_data,
 109 };
 110
 111 static struct resource dsmg600_uart_resources[] = {
 112         {
 113                 .start          = IXP4XX_UART1_BASE_PHYS,
 114                 .end            = IXP4XX_UART1_BASE_PHYS + 0x0fff,
 115                 .flags          = IORESOURCE_MEM,
 116         },
 117         {
 118                 .start          = IXP4XX_UART2_BASE_PHYS,
 119                 .end            = IXP4XX_UART2_BASE_PHYS + 0x0fff,
 120                 .flags          = IORESOURCE_MEM,
 121         }
 122 };
 123
 124 static struct plat_serial8250_port dsmg600_uart_data[] = {
 125         {
 126                 .mapbase        = IXP4XX_UART1_BASE_PHYS,
 127                 .membase        = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
 128                 .irq            = IRQ_IXP4XX_UART1,
 129                 .flags          = UPF_BOOT_AUTOCONF,
 130                 .iotype         = UPIO_MEM,
 131                 .regshift       = 2,
 132                 .uartclk        = IXP4XX_UART_XTAL,
 133         },
 134         {
 135                 .mapbase        = IXP4XX_UART2_BASE_PHYS,
 136                 .membase        = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
 137                 .irq            = IRQ_IXP4XX_UART2,
 138                 .flags          = UPF_BOOT_AUTOCONF,
 139                 .iotype         = UPIO_MEM,
 140                 .regshift       = 2,
 141                 .uartclk        = IXP4XX_UART_XTAL,
 142         },
 143         { }
 144 };
 145
 146 static struct platform_device dsmg600_uart = {
 147         .name                   = "serial8250",
 148         .id                     = PLAT8250_DEV_PLATFORM,
 149         .dev.platform_data      = dsmg600_uart_data,
 150         .num_resources          = ARRAY_SIZE(dsmg600_uart_resources),
 151         .resource               = dsmg600_uart_resources,
 152 };
 153
 154 static struct platform_device *dsmg600_devices[] __initdata = {
 155         &dsmg600_i2c_gpio,
 156         &dsmg600_flash,
 157         &dsmg600_leds,
 158 };
 159
 160 static void dsmg600_power_off(void)
 161 {
 162         /* enable the pwr cntl gpio */
 163         gpio_line_config(DSMG600_PO_GPIO, IXP4XX_GPIO_OUT);
 164
 165         /* poweroff */
 166         gpio_line_set(DSMG600_PO_GPIO, IXP4XX_GPIO_HIGH);
 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  */
 172 static 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
 177 static void dsmg600_power_handler(unsigned long data);
 178 static DEFINE_TIMER(dsmg600_power_timer, dsmg600_power_handler, 0, 0);
 179
 180 static 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_line_set(DSMG600_LED_PWR_GPIO, IXP4XX_GPIO_LOW);
 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
 212 static 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
 220 static 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
 229 static void __init dsmg600_init(void)
 230 {
 231         ixp4xx_sys_init();
 232
 233         /* Make sure that GPIO14 and GPIO15 are not used as clocks */
 234         *IXP4XX_GPIO_GPCLKR = 0;
 235
 236         dsmg600_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
 237         dsmg600_flash_resource.end =
 238                 IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
 239
 240         i2c_register_board_info(0, dsmg600_i2c_board_info,
 241                                 ARRAY_SIZE(dsmg600_i2c_board_info));
 242
 243         /* The UART is required on the DSM-G600 (Redboot cannot use the
 244          * NIC) -- do it here so that it does *not* get removed if
 245          * platform_add_devices fails!
 246          */
 247         (void)platform_device_register(&dsmg600_uart);
 248
 249         platform_add_devices(dsmg600_devices, ARRAY_SIZE(dsmg600_devices));
 250
 251         pm_power_off = dsmg600_power_off;
 252
 253         if (request_irq(gpio_to_irq(DSMG600_RB_GPIO), &dsmg600_reset_handler,
 254                 IRQF_DISABLED | IRQF_TRIGGER_LOW,
 255                 "DSM-G600 reset button", NULL) < 0) {
 256
 257                 printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
 258                         gpio_to_irq(DSMG600_RB_GPIO));
 259         }
 260
 261         /* The power button on the D-Link DSM-G600 is on GPIO 15, but
 262          * it cannot handle interrupts on that GPIO line.  So we'll
 263          * have to poll it with a kernel timer.
 264          */
 265
 266         /* Make sure that the power button GPIO is set up as an input */
 267         gpio_line_config(DSMG600_PB_GPIO, IXP4XX_GPIO_IN);
 268
 269         /* Set the initial value for the power button IRQ handler */
 270         power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
 271
 272         mod_timer(&dsmg600_power_timer, jiffies + msecs_to_jiffies(500));
 273 }
 274
 275 MACHINE_START(DSMG600, "D-Link DSM-G600 RevA")
 276         /* Maintainer: www.nslu2-linux.org */
 277         .atag_offset    = 0x100,
 278         .map_io         = ixp4xx_map_io,
 279         .init_early     = ixp4xx_init_early,
 280         .init_irq       = ixp4xx_init_irq,
 281         .init_time      = dsmg600_timer_init,
 282         .init_machine   = dsmg600_init,
 283 #if defined(CONFIG_PCI)
 284         .dma_zone_size  = SZ_64M,
 285 #endif
 286         .restart        = ixp4xx_restart,
 287 MACHINE_END