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
  36 #define DSMG600_SDA_PIN         5
  37 #define DSMG600_SCL_PIN         4
  38
  39 /* DSM-G600 Timer Setting */
  40 #define DSMG600_FREQ            66000000
  41
  42 /* Buttons */
  43 #define DSMG600_PB_GPIO         15      /* power button */
  44 #define DSMG600_RB_GPIO         3       /* reset button */
  45
  46 /* Power control */
  47 #define DSMG600_PO_GPIO         2       /* power off */
  48
  49 /* LEDs */
  50 #define DSMG600_LED_PWR_GPIO    0
  51 #define DSMG600_LED_WLAN_GPIO   14
  52
  53 static struct flash_platform_data dsmg600_flash_data = {
  54         .map_name               = "cfi_probe",
  55         .width                  = 2,
  56 };
  57
  58 static struct resource dsmg600_flash_resource = {
  59         .flags                  = IORESOURCE_MEM,
  60 };
  61
  62 static struct platform_device dsmg600_flash = {
  63         .name                   = "IXP4XX-Flash",
  64         .id                     = 0,
  65         .dev.platform_data      = &dsmg600_flash_data,
  66         .num_resources          = 1,
  67         .resource               = &dsmg600_flash_resource,
  68 };
  69
  70 static struct i2c_gpio_platform_data dsmg600_i2c_gpio_data = {
  71         .sda_pin                = DSMG600_SDA_PIN,
  72         .scl_pin                = DSMG600_SCL_PIN,
  73 };
  74
  75 static struct platform_device dsmg600_i2c_gpio = {
  76         .name                   = "i2c-gpio",
  77         .id                     = 0,
  78         .dev     = {
  79                 .platform_data  = &dsmg600_i2c_gpio_data,
  80         },
  81 };
  82
  83 static struct i2c_board_info __initdata dsmg600_i2c_board_info [] = {
  84         {
  85                 I2C_BOARD_INFO("pcf8563", 0x51),
  86         },
  87 };
  88
  89 static struct gpio_led dsmg600_led_pins[] = {
  90         {
  91                 .name           = "dsmg600:green:power",
  92                 .gpio           = DSMG600_LED_PWR_GPIO,
  93         },
  94         {
  95                 .name           = "dsmg600:green:wlan",
  96                 .gpio           = DSMG600_LED_WLAN_GPIO,
  97                 .active_low     = true,
  98         },
  99 };
 100
 101 static struct gpio_led_platform_data dsmg600_led_data = {
 102         .num_leds               = ARRAY_SIZE(dsmg600_led_pins),
 103         .leds                   = dsmg600_led_pins,
 104 };
 105
 106 static struct platform_device dsmg600_leds = {
 107         .name                   = "leds-gpio",
 108         .id                     = -1,
 109         .dev.platform_data      = &dsmg600_led_data,
 110 };
 111
 112 static struct resource dsmg600_uart_resources[] = {
 113         {
 114                 .start          = IXP4XX_UART1_BASE_PHYS,
 115                 .end            = IXP4XX_UART1_BASE_PHYS + 0x0fff,
 116                 .flags          = IORESOURCE_MEM,
 117         },
 118         {
 119                 .start          = IXP4XX_UART2_BASE_PHYS,
 120                 .end            = IXP4XX_UART2_BASE_PHYS + 0x0fff,
 121                 .flags          = IORESOURCE_MEM,
 122         }
 123 };
 124
 125 static struct plat_serial8250_port dsmg600_uart_data[] = {
 126         {
 127                 .mapbase        = IXP4XX_UART1_BASE_PHYS,
 128                 .membase        = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
 129                 .irq            = IRQ_IXP4XX_UART1,
 130                 .flags          = UPF_BOOT_AUTOCONF,
 131                 .iotype         = UPIO_MEM,
 132                 .regshift       = 2,
 133                 .uartclk        = IXP4XX_UART_XTAL,
 134         },
 135         {
 136                 .mapbase        = IXP4XX_UART2_BASE_PHYS,
 137                 .membase        = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
 138                 .irq            = IRQ_IXP4XX_UART2,
 139                 .flags          = UPF_BOOT_AUTOCONF,
 140                 .iotype         = UPIO_MEM,
 141                 .regshift       = 2,
 142                 .uartclk        = IXP4XX_UART_XTAL,
 143         },
 144         { }
 145 };
 146
 147 static struct platform_device dsmg600_uart = {
 148         .name                   = "serial8250",
 149         .id                     = PLAT8250_DEV_PLATFORM,
 150         .dev.platform_data      = dsmg600_uart_data,
 151         .num_resources          = ARRAY_SIZE(dsmg600_uart_resources),
 152         .resource               = dsmg600_uart_resources,
 153 };
 154
 155 static struct platform_device *dsmg600_devices[] __initdata = {
 156         &dsmg600_i2c_gpio,
 157         &dsmg600_flash,
 158         &dsmg600_leds,
 159 };
 160
 161 static void dsmg600_power_off(void)
 162 {
 163         /* enable the pwr cntl gpio */
 164         gpio_line_config(DSMG600_PO_GPIO, IXP4XX_GPIO_OUT);
 165
 166         /* poweroff */
 167         gpio_line_set(DSMG600_PO_GPIO, IXP4XX_GPIO_HIGH);
 168 }
 169
 170 /* This is used to make sure the power-button pusher is serious.  The button
 171  * must be held until the value of this counter reaches zero.
 172  */
 173 static int power_button_countdown;
 174
 175 /* Must hold the button down for at least this many counts to be processed */
 176 #define PBUTTON_HOLDDOWN_COUNT 4 /* 2 secs */
 177
 178 static void dsmg600_power_handler(unsigned long data);
 179 static DEFINE_TIMER(dsmg600_power_timer, dsmg600_power_handler, 0, 0);
 180
 181 static void dsmg600_power_handler(unsigned long data)
 182 {
 183         /* This routine is called twice per second to check the
 184          * state of the power button.
 185          */
 186
 187         if (gpio_get_value(DSMG600_PB_GPIO)) {
 188
 189                 /* IO Pin is 1 (button pushed) */
 190                 if (power_button_countdown > 0)
 191                         power_button_countdown--;
 192
 193         } else {
 194
 195                 /* Done on button release, to allow for auto-power-on mods. */
 196                 if (power_button_countdown == 0) {
 197                         /* Signal init to do the ctrlaltdel action,
 198                          * this will bypass init if it hasn't started
 199                          * and do a kernel_restart.
 200                          */
 201                         ctrl_alt_del();
 202
 203                         /* Change the state of the power LED to "blink" */
 204                         gpio_line_set(DSMG600_LED_PWR_GPIO, IXP4XX_GPIO_LOW);
 205                 } else {
 206                         power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
 207                 }
 208         }
 209
 210         mod_timer(&dsmg600_power_timer, jiffies + msecs_to_jiffies(500));
 211 }
 212
 213 static irqreturn_t dsmg600_reset_handler(int irq, void *dev_id)
 214 {
 215         /* This is the paper-clip reset, it shuts the machine down directly. */
 216         machine_power_off();
 217
 218         return IRQ_HANDLED;
 219 }
 220
 221 static void __init dsmg600_timer_init(void)
 222 {
 223     /* The xtal on this machine is non-standard. */
 224     ixp4xx_timer_freq = DSMG600_FREQ;
 225
 226     /* Call standard timer_init function. */
 227     ixp4xx_timer_init();
 228 }
 229
 230 static struct sys_timer dsmg600_timer = {
 231     .init   = dsmg600_timer_init,
 232 };
 233
 234 static void __init dsmg600_init(void)
 235 {
 236         ixp4xx_sys_init();
 237
 238         /* Make sure that GPIO14 and GPIO15 are not used as clocks */
 239         *IXP4XX_GPIO_GPCLKR = 0;
 240
 241         dsmg600_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
 242         dsmg600_flash_resource.end =
 243                 IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
 244
 245         i2c_register_board_info(0, dsmg600_i2c_board_info,
 246                                 ARRAY_SIZE(dsmg600_i2c_board_info));
 247
 248         /* The UART is required on the DSM-G600 (Redboot cannot use the
 249          * NIC) -- do it here so that it does *not* get removed if
 250          * platform_add_devices fails!
 251          */
 252         (void)platform_device_register(&dsmg600_uart);
 253
 254         platform_add_devices(dsmg600_devices, ARRAY_SIZE(dsmg600_devices));
 255
 256         pm_power_off = dsmg600_power_off;
 257
 258         if (request_irq(gpio_to_irq(DSMG600_RB_GPIO), &dsmg600_reset_handler,
 259                 IRQF_DISABLED | IRQF_TRIGGER_LOW,
 260                 "DSM-G600 reset button", NULL) < 0) {
 261
 262                 printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
 263                         gpio_to_irq(DSMG600_RB_GPIO));
 264         }
 265
 266         /* The power button on the D-Link DSM-G600 is on GPIO 15, but
 267          * it cannot handle interrupts on that GPIO line.  So we'll
 268          * have to poll it with a kernel timer.
 269          */
 270
 271         /* Make sure that the power button GPIO is set up as an input */
 272         gpio_line_config(DSMG600_PB_GPIO, IXP4XX_GPIO_IN);
 273
 274         /* Set the initial value for the power button IRQ handler */
 275         power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
 276
 277         mod_timer(&dsmg600_power_timer, jiffies + msecs_to_jiffies(500));
 278 }
 279
 280 MACHINE_START(DSMG600, "D-Link DSM-G600 RevA")
 281         /* Maintainer: www.nslu2-linux.org */
 282         .boot_params    = 0x00000100,
 283         .map_io         = ixp4xx_map_io,
 284         .init_irq       = ixp4xx_init_irq,
 285         .timer          = &dsmg600_timer,
 286         .init_machine   = dsmg600_init,
 287 MACHINE_END