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
  54 static struct flash_platform_data dsmg600_flash_data = {
  55         .map_name               = "cfi_probe",
  56         .width                  = 2,
  57 };
  58
  59 static struct resource dsmg600_flash_resource = {
  60         .flags                  = IORESOURCE_MEM,
  61 };
  62
  63 static 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
  71 static struct i2c_gpio_platform_data dsmg600_i2c_gpio_data = {
  72         .sda_pin                = DSMG600_SDA_PIN,
  73         .scl_pin                = DSMG600_SCL_PIN,
  74 };
  75
  76 static 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
  84 static struct i2c_board_info __initdata dsmg600_i2c_board_info [] = {
  85         {
  86                 I2C_BOARD_INFO("pcf8563", 0x51),
  87         },
  88 };
  89
  90 static 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
 102 static struct gpio_led_platform_data dsmg600_led_data = {
 103         .num_leds               = ARRAY_SIZE(dsmg600_led_pins),
 104         .leds                   = dsmg600_led_pins,
 105 };
 106
 107 static struct platform_device dsmg600_leds = {
 108         .name                   = "leds-gpio",
 109         .id                     = -1,
 110         .dev.platform_data      = &dsmg600_led_data,
 111 };
 112
 113 static 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
 126 static 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
 148 static 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
 156 static struct platform_device *dsmg600_devices[] __initdata = {
 157         &dsmg600_i2c_gpio,
 158         &dsmg600_flash,
 159         &dsmg600_leds,
 160 };
 161
 162 static 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  */
 174 static 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
 179 static void dsmg600_power_handler(unsigned long data);
 180 static DEFINE_TIMER(dsmg600_power_timer, dsmg600_power_handler, 0, 0);
 181
 182 static 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
 214 static 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
 222 static 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
 231 static 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
 277 MACHINE_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,
 289 MACHINE_END