arch/arm/mach-ixp4xx/nas100d-setup.c

   1 /*
   2  * arch/arm/mach-ixp4xx/nas100d-setup.c
   3  *
   4  * NAS 100d board-setup
   5  *
   6  * Copyright (C) 2008 Rod Whitby <rod@whitby.id.au>
   7  *
   8  * based on ixdp425-setup.c:
   9  *      Copyright (C) 2003-2004 MontaVista Software, Inc.
  10  * based on nas100d-power.c:
  11  *      Copyright (C) 2005 Tower Technologies
  12  * based on nas100d-io.c
  13  *      Copyright (C) 2004 Karen Spearel
  14  *
  15  * Author: Alessandro Zummo <a.zummo@towertech.it>
  16  * Author: Rod Whitby <rod@whitby.id.au>
  17  * Maintainers: http://www.nslu2-linux.org/
  18  *
  19  */
  20 #include <linux/gpio.h>
  21 #include <linux/if_ether.h>
  22 #include <linux/irq.h>
  23 #include <linux/jiffies.h>
  24 #include <linux/timer.h>
  25 #include <linux/serial.h>
  26 #include <linux/serial_8250.h>
  27 #include <linux/leds.h>
  28 #include <linux/reboot.h>
  29 #include <linux/i2c.h>
  30 #include <linux/i2c-gpio.h>
  31 #include <linux/io.h>
  32 #include <asm/mach-types.h>
  33 #include <asm/mach/arch.h>
  34 #include <asm/mach/flash.h>
  35
  36 #define NAS100D_SDA_PIN         5
  37 #define NAS100D_SCL_PIN         6
  38
  39 /* Buttons */
  40 #define NAS100D_PB_GPIO         14   /* power button */
  41 #define NAS100D_RB_GPIO         4    /* reset button */
  42
  43 /* Power control */
  44 #define NAS100D_PO_GPIO         12   /* power off */
  45
  46 /* LEDs */
  47 #define NAS100D_LED_WLAN_GPIO   0
  48 #define NAS100D_LED_DISK_GPIO   3
  49 #define NAS100D_LED_PWR_GPIO    15
  50
  51 static struct flash_platform_data nas100d_flash_data = {
  52         .map_name               = "cfi_probe",
  53         .width                  = 2,
  54 };
  55
  56 static struct resource nas100d_flash_resource = {
  57         .flags                  = IORESOURCE_MEM,
  58 };
  59
  60 static struct platform_device nas100d_flash = {
  61         .name                   = "IXP4XX-Flash",
  62         .id                     = 0,
  63         .dev.platform_data      = &nas100d_flash_data,
  64         .num_resources          = 1,
  65         .resource               = &nas100d_flash_resource,
  66 };
  67
  68 static struct i2c_board_info __initdata nas100d_i2c_board_info [] = {
  69         {
  70                 I2C_BOARD_INFO("pcf8563", 0x51),
  71         },
  72 };
  73
  74 static struct gpio_led nas100d_led_pins[] = {
  75         {
  76                 .name           = "nas100d:green:wlan",
  77                 .gpio           = NAS100D_LED_WLAN_GPIO,
  78                 .active_low     = true,
  79         },
  80         {
  81                 .name           = "nas100d:blue:power",  /* (off=flashing) */
  82                 .gpio           = NAS100D_LED_PWR_GPIO,
  83                 .active_low     = true,
  84         },
  85         {
  86                 .name           = "nas100d:yellow:disk",
  87                 .gpio           = NAS100D_LED_DISK_GPIO,
  88                 .active_low     = true,
  89         },
  90 };
  91
  92 static struct gpio_led_platform_data nas100d_led_data = {
  93         .num_leds               = ARRAY_SIZE(nas100d_led_pins),
  94         .leds                   = nas100d_led_pins,
  95 };
  96
  97 static struct platform_device nas100d_leds = {
  98         .name                   = "leds-gpio",
  99         .id                     = -1,
 100         .dev.platform_data      = &nas100d_led_data,
 101 };
 102
 103 static struct i2c_gpio_platform_data nas100d_i2c_gpio_data = {
 104         .sda_pin                = NAS100D_SDA_PIN,
 105         .scl_pin                = NAS100D_SCL_PIN,
 106 };
 107
 108 static struct platform_device nas100d_i2c_gpio = {
 109         .name                   = "i2c-gpio",
 110         .id                     = 0,
 111         .dev     = {
 112                 .platform_data  = &nas100d_i2c_gpio_data,
 113         },
 114 };
 115
 116 static struct resource nas100d_uart_resources[] = {
 117         {
 118                 .start          = IXP4XX_UART1_BASE_PHYS,
 119                 .end            = IXP4XX_UART1_BASE_PHYS + 0x0fff,
 120                 .flags          = IORESOURCE_MEM,
 121         },
 122         {
 123                 .start          = IXP4XX_UART2_BASE_PHYS,
 124                 .end            = IXP4XX_UART2_BASE_PHYS + 0x0fff,
 125                 .flags          = IORESOURCE_MEM,
 126         }
 127 };
 128
 129 static struct plat_serial8250_port nas100d_uart_data[] = {
 130         {
 131                 .mapbase        = IXP4XX_UART1_BASE_PHYS,
 132                 .membase        = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
 133                 .irq            = IRQ_IXP4XX_UART1,
 134                 .flags          = UPF_BOOT_AUTOCONF,
 135                 .iotype         = UPIO_MEM,
 136                 .regshift       = 2,
 137                 .uartclk        = IXP4XX_UART_XTAL,
 138         },
 139         {
 140                 .mapbase        = IXP4XX_UART2_BASE_PHYS,
 141                 .membase        = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
 142                 .irq            = IRQ_IXP4XX_UART2,
 143                 .flags          = UPF_BOOT_AUTOCONF,
 144                 .iotype         = UPIO_MEM,
 145                 .regshift       = 2,
 146                 .uartclk        = IXP4XX_UART_XTAL,
 147         },
 148         { }
 149 };
 150
 151 static struct platform_device nas100d_uart = {
 152         .name                   = "serial8250",
 153         .id                     = PLAT8250_DEV_PLATFORM,
 154         .dev.platform_data      = nas100d_uart_data,
 155         .num_resources          = 2,
 156         .resource               = nas100d_uart_resources,
 157 };
 158
 159 /* Built-in 10/100 Ethernet MAC interfaces */
 160 static struct eth_plat_info nas100d_plat_eth[] = {
 161         {
 162                 .phy            = 0,
 163                 .rxq            = 3,
 164                 .txreadyq       = 20,
 165         }
 166 };
 167
 168 static struct platform_device nas100d_eth[] = {
 169         {
 170                 .name                   = "ixp4xx_eth",
 171                 .id                     = IXP4XX_ETH_NPEB,
 172                 .dev.platform_data      = nas100d_plat_eth,
 173         }
 174 };
 175
 176 static struct platform_device *nas100d_devices[] __initdata = {
 177         &nas100d_i2c_gpio,
 178         &nas100d_flash,
 179         &nas100d_leds,
 180         &nas100d_eth[0],
 181 };
 182
 183 static void nas100d_power_off(void)
 184 {
 185         /* This causes the box to drop the power and go dead. */
 186
 187         /* enable the pwr cntl gpio and assert power off */
 188         gpio_direction_output(NAS100D_PO_GPIO, 1);
 189 }
 190
 191 /* This is used to make sure the power-button pusher is serious.  The button
 192  * must be held until the value of this counter reaches zero.
 193  */
 194 static int power_button_countdown;
 195
 196 /* Must hold the button down for at least this many counts to be processed */
 197 #define PBUTTON_HOLDDOWN_COUNT 4 /* 2 secs */
 198
 199 static void nas100d_power_handler(unsigned long data);
 200 static DEFINE_TIMER(nas100d_power_timer, nas100d_power_handler, 0, 0);
 201
 202 static void nas100d_power_handler(unsigned long data)
 203 {
 204         /* This routine is called twice per second to check the
 205          * state of the power button.
 206          */
 207
 208         if (gpio_get_value(NAS100D_PB_GPIO)) {
 209
 210                 /* IO Pin is 1 (button pushed) */
 211                 if (power_button_countdown > 0)
 212                         power_button_countdown--;
 213
 214         } else {
 215
 216                 /* Done on button release, to allow for auto-power-on mods. */
 217                 if (power_button_countdown == 0) {
 218                         /* Signal init to do the ctrlaltdel action,
 219                          * this will bypass init if it hasn't started
 220                          * and do a kernel_restart.
 221                          */
 222                         ctrl_alt_del();
 223
 224                         /* Change the state of the power LED to "blink" */
 225                         gpio_set_value(NAS100D_LED_PWR_GPIO, 0);
 226                 } else {
 227                         power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
 228                 }
 229         }
 230
 231         mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500));
 232 }
 233
 234 static irqreturn_t nas100d_reset_handler(int irq, void *dev_id)
 235 {
 236         /* This is the paper-clip reset, it shuts the machine down directly. */
 237         machine_power_off();
 238
 239         return IRQ_HANDLED;
 240 }
 241
 242 static int __init nas100d_gpio_init(void)
 243 {
 244         if (!machine_is_nas100d())
 245                 return 0;
 246
 247         /*
 248          * The power button on the Iomega NAS100d is on GPIO 14, but
 249          * it cannot handle interrupts on that GPIO line.  So we'll
 250          * have to poll it with a kernel timer.
 251          */
 252
 253         /* Request the power off GPIO */
 254         gpio_request(NAS100D_PO_GPIO, "power off");
 255
 256         /* Make sure that the power button GPIO is set up as an input */
 257         gpio_request(NAS100D_PB_GPIO, "power button");
 258         gpio_direction_input(NAS100D_PB_GPIO);
 259
 260         /* Set the initial value for the power button IRQ handler */
 261         power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
 262
 263         mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500));
 264
 265         return 0;
 266 }
 267 device_initcall(nas100d_gpio_init);
 268
 269 static void __init nas100d_init(void)
 270 {
 271         uint8_t __iomem *f;
 272         int i;
 273
 274         ixp4xx_sys_init();
 275
 276         /* gpio 14 and 15 are _not_ clocks */
 277         *IXP4XX_GPIO_GPCLKR = 0;
 278
 279         nas100d_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
 280         nas100d_flash_resource.end =
 281                 IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
 282
 283         i2c_register_board_info(0, nas100d_i2c_board_info,
 284                                 ARRAY_SIZE(nas100d_i2c_board_info));
 285
 286         /*
 287          * This is only useful on a modified machine, but it is valuable
 288          * to have it first in order to see debug messages, and so that
 289          * it does *not* get removed if platform_add_devices fails!
 290          */
 291         (void)platform_device_register(&nas100d_uart);
 292
 293         platform_add_devices(nas100d_devices, ARRAY_SIZE(nas100d_devices));
 294
 295         pm_power_off = nas100d_power_off;
 296
 297         if (request_irq(gpio_to_irq(NAS100D_RB_GPIO), &nas100d_reset_handler,
 298                 IRQF_TRIGGER_LOW, "NAS100D reset button", NULL) < 0) {
 299
 300                 printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
 301                         gpio_to_irq(NAS100D_RB_GPIO));
 302         }
 303
 304         /*
 305          * Map in a portion of the flash and read the MAC address.
 306          * Since it is stored in BE in the flash itself, we need to
 307          * byteswap it if we're in LE mode.
 308          */
 309         f = ioremap(IXP4XX_EXP_BUS_BASE(0), 0x1000000);
 310         if (f) {
 311                 for (i = 0; i < 6; i++)
 312 #ifdef __ARMEB__
 313                         nas100d_plat_eth[0].hwaddr[i] = readb(f + 0xFC0FD8 + i);
 314 #else
 315                         nas100d_plat_eth[0].hwaddr[i] = readb(f + 0xFC0FD8 + (i^3));
 316 #endif
 317                 iounmap(f);
 318         }
 319         printk(KERN_INFO "NAS100D: Using MAC address %pM for port 0\n",
 320                nas100d_plat_eth[0].hwaddr);
 321
 322 }
 323
 324 MACHINE_START(NAS100D, "Iomega NAS 100d")
 325         /* Maintainer: www.nslu2-linux.org */
 326         .atag_offset    = 0x100,
 327         .map_io         = ixp4xx_map_io,
 328         .init_early     = ixp4xx_init_early,
 329         .init_irq       = ixp4xx_init_irq,
 330         .init_time      = ixp4xx_timer_init,
 331         .init_machine   = nas100d_init,
 332 #if defined(CONFIG_PCI)
 333         .dma_zone_size  = SZ_64M,
 334 #endif
 335         .restart        = ixp4xx_restart,
 336 MACHINE_END