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 #include <linux/gpio.h>
  30
  31 #include <mach/hardware.h>
  32
  33 #include <asm/mach-types.h>
  34 #include <asm/mach/arch.h>
  35 #include <asm/mach/flash.h>
  36 #include <asm/mach/time.h>
  37
  38 #define DSMG600_SDA_PIN         5
  39 #define DSMG600_SCL_PIN         4
  40
  41 /* DSM-G600 Timer Setting */
  42 #define DSMG600_FREQ            66000000
  43
  44 /* Buttons */
  45 #define DSMG600_PB_GPIO         15      /* power button */
  46 #define DSMG600_RB_GPIO         3       /* reset button */
  47
  48 /* Power control */
  49 #define DSMG600_PO_GPIO         2       /* power off */
  50
  51 /* LEDs */
  52 #define DSMG600_LED_PWR_GPIO    0
  53 #define DSMG600_LED_WLAN_GPIO   14
  54
  55 static struct flash_platform_data dsmg600_flash_data = {
  56         .map_name               = "cfi_probe",
  57         .width                  = 2,
  58 };
  59
  60 static struct resource dsmg600_flash_resource = {
  61         .flags                  = IORESOURCE_MEM,
  62 };
  63
  64 static struct platform_device dsmg600_flash = {
  65         .name                   = "IXP4XX-Flash",
  66         .id                     = 0,
  67         .dev.platform_data      = &dsmg600_flash_data,
  68         .num_resources          = 1,
  69         .resource               = &dsmg600_flash_resource,
  70 };
  71
  72 static struct i2c_gpio_platform_data dsmg600_i2c_gpio_data = {
  73         .sda_pin                = DSMG600_SDA_PIN,
  74         .scl_pin                = DSMG600_SCL_PIN,
  75 };
  76
  77 static struct platform_device dsmg600_i2c_gpio = {
  78         .name                   = "i2c-gpio",
  79         .id                     = 0,
  80         .dev     = {
  81                 .platform_data  = &dsmg600_i2c_gpio_data,
  82         },
  83 };
  84
  85 static struct i2c_board_info __initdata dsmg600_i2c_board_info [] = {
  86         {
  87                 I2C_BOARD_INFO("pcf8563", 0x51),
  88         },
  89 };
  90
  91 static struct gpio_led dsmg600_led_pins[] = {
  92         {
  93                 .name           = "dsmg600:green:power",
  94                 .gpio           = DSMG600_LED_PWR_GPIO,
  95         },
  96         {
  97                 .name           = "dsmg600:green:wlan",
  98                 .gpio           = DSMG600_LED_WLAN_GPIO,
  99                 .active_low     = true,
 100         },
 101 };
 102
 103 static struct gpio_led_platform_data dsmg600_led_data = {
 104         .num_leds               = ARRAY_SIZE(dsmg600_led_pins),
 105         .leds                   = dsmg600_led_pins,
 106 };
 107
 108 static struct platform_device dsmg600_leds = {
 109         .name                   = "leds-gpio",
 110         .id                     = -1,
 111         .dev.platform_data      = &dsmg600_led_data,
 112 };
 113
 114 static struct resource dsmg600_uart_resources[] = {
 115         {
 116                 .start          = IXP4XX_UART1_BASE_PHYS,
 117                 .end            = IXP4XX_UART1_BASE_PHYS + 0x0fff,
 118                 .flags          = IORESOURCE_MEM,
 119         },
 120         {
 121                 .start          = IXP4XX_UART2_BASE_PHYS,
 122                 .end            = IXP4XX_UART2_BASE_PHYS + 0x0fff,
 123                 .flags          = IORESOURCE_MEM,
 124         }
 125 };
 126
 127 static struct plat_serial8250_port dsmg600_uart_data[] = {
 128         {
 129                 .mapbase        = IXP4XX_UART1_BASE_PHYS,
 130                 .membase        = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
 131                 .irq            = IRQ_IXP4XX_UART1,
 132                 .flags          = UPF_BOOT_AUTOCONF,
 133                 .iotype         = UPIO_MEM,
 134                 .regshift       = 2,
 135                 .uartclk        = IXP4XX_UART_XTAL,
 136         },
 137         {
 138                 .mapbase        = IXP4XX_UART2_BASE_PHYS,
 139                 .membase        = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
 140                 .irq            = IRQ_IXP4XX_UART2,
 141                 .flags          = UPF_BOOT_AUTOCONF,
 142                 .iotype         = UPIO_MEM,
 143                 .regshift       = 2,
 144                 .uartclk        = IXP4XX_UART_XTAL,
 145         },
 146         { }
 147 };
 148
 149 static struct platform_device dsmg600_uart = {
 150         .name                   = "serial8250",
 151         .id                     = PLAT8250_DEV_PLATFORM,
 152         .dev.platform_data      = dsmg600_uart_data,
 153         .num_resources          = ARRAY_SIZE(dsmg600_uart_resources),
 154         .resource               = dsmg600_uart_resources,
 155 };
 156
 157 static struct platform_device *dsmg600_devices[] __initdata = {
 158         &dsmg600_i2c_gpio,
 159         &dsmg600_flash,
 160         &dsmg600_leds,
 161 };
 162
 163 static void dsmg600_power_off(void)
 164 {
 165         /* enable the pwr cntl and drive it high */
 166         gpio_direction_output(DSMG600_PO_GPIO, 1);
 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_set_value(DSMG600_LED_PWR_GPIO, 0);
 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 int __init dsmg600_gpio_init(void)
 230 {
 231         if (!machine_is_dsmg600())
 232                 return 0;
 233
 234         gpio_request(DSMG600_RB_GPIO, "reset button");
 235         if (request_irq(gpio_to_irq(DSMG600_RB_GPIO), &dsmg600_reset_handler,
 236                 IRQF_DISABLED | IRQF_TRIGGER_LOW,
 237                 "DSM-G600 reset button", NULL) < 0) {
 238
 239                 printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
 240                         gpio_to_irq(DSMG600_RB_GPIO));
 241         }
 242
 243         /*
 244          * The power button on the D-Link DSM-G600 is on GPIO 15, but
 245          * it cannot handle interrupts on that GPIO line.  So we'll
 246          * have to poll it with a kernel timer.
 247          */
 248
 249         /* Make sure that the power button GPIO is set up as an input */
 250         gpio_request(DSMG600_PB_GPIO, "power button");
 251         gpio_direction_input(DSMG600_PB_GPIO);
 252         /* Request poweroff GPIO line */
 253         gpio_request(DSMG600_PO_GPIO, "power off button");
 254
 255         /* Set the initial value for the power button IRQ handler */
 256         power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
 257
 258         mod_timer(&dsmg600_power_timer, jiffies + msecs_to_jiffies(500));
 259         return 0;
 260 }
 261 device_initcall(dsmg600_gpio_init);
 262
 263 static void __init dsmg600_init(void)
 264 {
 265         ixp4xx_sys_init();
 266
 267         /* Make sure that GPIO14 and GPIO15 are not used as clocks */
 268         *IXP4XX_GPIO_GPCLKR = 0;
 269
 270         dsmg600_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
 271         dsmg600_flash_resource.end =
 272                 IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
 273
 274         i2c_register_board_info(0, dsmg600_i2c_board_info,
 275                                 ARRAY_SIZE(dsmg600_i2c_board_info));
 276
 277         /* The UART is required on the DSM-G600 (Redboot cannot use the
 278          * NIC) -- do it here so that it does *not* get removed if
 279          * platform_add_devices fails!
 280          */
 281         (void)platform_device_register(&dsmg600_uart);
 282
 283         platform_add_devices(dsmg600_devices, ARRAY_SIZE(dsmg600_devices));
 284
 285         pm_power_off = dsmg600_power_off;
 286 }
 287
 288 MACHINE_START(DSMG600, "D-Link DSM-G600 RevA")
 289         /* Maintainer: www.nslu2-linux.org */
 290         .atag_offset    = 0x100,
 291         .map_io         = ixp4xx_map_io,
 292         .init_early     = ixp4xx_init_early,
 293         .init_irq       = ixp4xx_init_irq,
 294         .init_time      = dsmg600_timer_init,
 295         .init_machine   = dsmg600_init,
 296 #if defined(CONFIG_PCI)
 297         .dma_zone_size  = SZ_64M,
 298 #endif
 299         .restart        = ixp4xx_restart,
 300 MACHINE_END