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 static struct flash_platform_data dsmg600_flash_data = {
  37         .map_name               = "cfi_probe",
  38         .width                  = 2,
  39 };
  40
  41 static struct resource dsmg600_flash_resource = {
  42         .flags                  = IORESOURCE_MEM,
  43 };
  44
  45 static 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
  53 static struct i2c_gpio_platform_data dsmg600_i2c_gpio_data = {
  54         .sda_pin                = DSMG600_SDA_PIN,
  55         .scl_pin                = DSMG600_SCL_PIN,
  56 };
  57
  58 static 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
  66 static struct i2c_board_info __initdata dsmg600_i2c_board_info [] = {
  67         {
  68                 I2C_BOARD_INFO("rtc-pcf8563", 0x51),
  69         },
  70 };
  71
  72 static 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
  84 static struct gpio_led_platform_data dsmg600_led_data = {
  85         .num_leds               = ARRAY_SIZE(dsmg600_led_pins),
  86         .leds                   = dsmg600_led_pins,
  87 };
  88
  89 static struct platform_device dsmg600_leds = {
  90         .name                   = "leds-gpio",
  91         .id                     = -1,
  92         .dev.platform_data      = &dsmg600_led_data,
  93 };
  94
  95 static 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
 108 static 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
 130 static 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
 138 static struct platform_device *dsmg600_devices[] __initdata = {
 139         &dsmg600_i2c_gpio,
 140         &dsmg600_flash,
 141         &dsmg600_leds,
 142 };
 143
 144 static 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  */
 156 static 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
 161 static void dsmg600_power_handler(unsigned long data);
 162 static DEFINE_TIMER(dsmg600_power_timer, dsmg600_power_handler, 0, 0);
 163
 164 static 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
 196 static 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
 204 static 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
 213 static struct sys_timer dsmg600_timer = {
 214     .init   = dsmg600_timer_init,
 215 };
 216
 217 static 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
 263 MACHINE_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,
 272 MACHINE_END