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
  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
  32 #include <asm/mach-types.h>
  33 #include <asm/mach/arch.h>
  34 #include <asm/mach/flash.h>
  35 #include <asm/io.h>
  36 #include <asm/gpio.h>
  37
  38 static struct flash_platform_data nas100d_flash_data = {
  39         .map_name               = "cfi_probe",
  40         .width                  = 2,
  41 };
  42
  43 static struct resource nas100d_flash_resource = {
  44         .flags                  = IORESOURCE_MEM,
  45 };
  46
  47 static struct platform_device nas100d_flash = {
  48         .name                   = "IXP4XX-Flash",
  49         .id                     = 0,
  50         .dev.platform_data      = &nas100d_flash_data,
  51         .num_resources          = 1,
  52         .resource               = &nas100d_flash_resource,
  53 };
  54
  55 static struct i2c_board_info __initdata nas100d_i2c_board_info [] = {
  56         {
  57                 I2C_BOARD_INFO("rtc-pcf8563", 0x51),
  58         },
  59 };
  60
  61 static struct gpio_led nas100d_led_pins[] = {
  62         {
  63                 .name           = "nas100d:green:wlan",
  64                 .gpio           = NAS100D_LED_WLAN_GPIO,
  65                 .active_low     = true,
  66         },
  67         {
  68                 .name           = "nas100d:blue:power",  /* (off=flashing) */
  69                 .gpio           = NAS100D_LED_PWR_GPIO,
  70                 .active_low     = true,
  71         },
  72         {
  73                 .name           = "nas100d:yellow:disk",
  74                 .gpio           = NAS100D_LED_DISK_GPIO,
  75                 .active_low     = true,
  76         },
  77 };
  78
  79 static struct gpio_led_platform_data nas100d_led_data = {
  80         .num_leds               = ARRAY_SIZE(nas100d_led_pins),
  81         .leds                   = nas100d_led_pins,
  82 };
  83
  84 static struct platform_device nas100d_leds = {
  85         .name                   = "leds-gpio",
  86         .id                     = -1,
  87         .dev.platform_data      = &nas100d_led_data,
  88 };
  89
  90 static struct i2c_gpio_platform_data nas100d_i2c_gpio_data = {
  91         .sda_pin                = NAS100D_SDA_PIN,
  92         .scl_pin                = NAS100D_SCL_PIN,
  93 };
  94
  95 static struct platform_device nas100d_i2c_gpio = {
  96         .name                   = "i2c-gpio",
  97         .id                     = 0,
  98         .dev     = {
  99                 .platform_data  = &nas100d_i2c_gpio_data,
 100         },
 101 };
 102
 103 static struct resource nas100d_uart_resources[] = {
 104         {
 105                 .start          = IXP4XX_UART1_BASE_PHYS,
 106                 .end            = IXP4XX_UART1_BASE_PHYS + 0x0fff,
 107                 .flags          = IORESOURCE_MEM,
 108         },
 109         {
 110                 .start          = IXP4XX_UART2_BASE_PHYS,
 111                 .end            = IXP4XX_UART2_BASE_PHYS + 0x0fff,
 112                 .flags          = IORESOURCE_MEM,
 113         }
 114 };
 115
 116 static struct plat_serial8250_port nas100d_uart_data[] = {
 117         {
 118                 .mapbase        = IXP4XX_UART1_BASE_PHYS,
 119                 .membase        = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
 120                 .irq            = IRQ_IXP4XX_UART1,
 121                 .flags          = UPF_BOOT_AUTOCONF,
 122                 .iotype         = UPIO_MEM,
 123                 .regshift       = 2,
 124                 .uartclk        = IXP4XX_UART_XTAL,
 125         },
 126         {
 127                 .mapbase        = IXP4XX_UART2_BASE_PHYS,
 128                 .membase        = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
 129                 .irq            = IRQ_IXP4XX_UART2,
 130                 .flags          = UPF_BOOT_AUTOCONF,
 131                 .iotype         = UPIO_MEM,
 132                 .regshift       = 2,
 133                 .uartclk        = IXP4XX_UART_XTAL,
 134         },
 135         { }
 136 };
 137
 138 static struct platform_device nas100d_uart = {
 139         .name                   = "serial8250",
 140         .id                     = PLAT8250_DEV_PLATFORM,
 141         .dev.platform_data      = nas100d_uart_data,
 142         .num_resources          = 2,
 143         .resource               = nas100d_uart_resources,
 144 };
 145
 146 /* Built-in 10/100 Ethernet MAC interfaces */
 147 static struct eth_plat_info nas100d_plat_eth[] = {
 148         {
 149                 .phy            = 0,
 150                 .rxq            = 3,
 151                 .txreadyq       = 20,
 152         }
 153 };
 154
 155 static struct platform_device nas100d_eth[] = {
 156         {
 157                 .name                   = "ixp4xx_eth",
 158                 .id                     = IXP4XX_ETH_NPEB,
 159                 .dev.platform_data      = nas100d_plat_eth,
 160         }
 161 };
 162
 163 static struct platform_device *nas100d_devices[] __initdata = {
 164         &nas100d_i2c_gpio,
 165         &nas100d_flash,
 166         &nas100d_leds,
 167         &nas100d_eth[0],
 168 };
 169
 170 static void nas100d_power_off(void)
 171 {
 172         /* This causes the box to drop the power and go dead. */
 173
 174         /* enable the pwr cntl gpio */
 175         gpio_line_config(NAS100D_PO_GPIO, IXP4XX_GPIO_OUT);
 176
 177         /* do the deed */
 178         gpio_line_set(NAS100D_PO_GPIO, IXP4XX_GPIO_HIGH);
 179 }
 180
 181 /* This is used to make sure the power-button pusher is serious.  The button
 182  * must be held until the value of this counter reaches zero.
 183  */
 184 static int power_button_countdown;
 185
 186 /* Must hold the button down for at least this many counts to be processed */
 187 #define PBUTTON_HOLDDOWN_COUNT 4 /* 2 secs */
 188
 189 static void nas100d_power_handler(unsigned long data);
 190 static DEFINE_TIMER(nas100d_power_timer, nas100d_power_handler, 0, 0);
 191
 192 static void nas100d_power_handler(unsigned long data)
 193 {
 194         /* This routine is called twice per second to check the
 195          * state of the power button.
 196          */
 197
 198         if (gpio_get_value(NAS100D_PB_GPIO)) {
 199
 200                 /* IO Pin is 1 (button pushed) */
 201                 if (power_button_countdown > 0)
 202                         power_button_countdown--;
 203
 204         } else {
 205
 206                 /* Done on button release, to allow for auto-power-on mods. */
 207                 if (power_button_countdown == 0) {
 208                         /* Signal init to do the ctrlaltdel action,
 209                          * this will bypass init if it hasn't started
 210                          * and do a kernel_restart.
 211                          */
 212                         ctrl_alt_del();
 213
 214                         /* Change the state of the power LED to "blink" */
 215                         gpio_line_set(NAS100D_LED_PWR_GPIO, IXP4XX_GPIO_LOW);
 216                 } else {
 217                         power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
 218                 }
 219         }
 220
 221         mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500));
 222 }
 223
 224 static irqreturn_t nas100d_reset_handler(int irq, void *dev_id)
 225 {
 226         /* This is the paper-clip reset, it shuts the machine down directly. */
 227         machine_power_off();
 228
 229         return IRQ_HANDLED;
 230 }
 231
 232 static void __init nas100d_init(void)
 233 {
 234         DECLARE_MAC_BUF(mac_buf);
 235         uint8_t __iomem *f;
 236         int i;
 237
 238         ixp4xx_sys_init();
 239
 240         /* gpio 14 and 15 are _not_ clocks */
 241         *IXP4XX_GPIO_GPCLKR = 0;
 242
 243         nas100d_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
 244         nas100d_flash_resource.end =
 245                 IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
 246
 247         i2c_register_board_info(0, nas100d_i2c_board_info,
 248                                 ARRAY_SIZE(nas100d_i2c_board_info));
 249
 250         /*
 251          * This is only useful on a modified machine, but it is valuable
 252          * to have it first in order to see debug messages, and so that
 253          * it does *not* get removed if platform_add_devices fails!
 254          */
 255         (void)platform_device_register(&nas100d_uart);
 256
 257         platform_add_devices(nas100d_devices, ARRAY_SIZE(nas100d_devices));
 258
 259         pm_power_off = nas100d_power_off;
 260
 261         if (request_irq(gpio_to_irq(NAS100D_RB_GPIO), &nas100d_reset_handler,
 262                 IRQF_DISABLED | IRQF_TRIGGER_LOW,
 263                 "NAS100D reset button", NULL) < 0) {
 264
 265                 printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
 266                         gpio_to_irq(NAS100D_RB_GPIO));
 267         }
 268
 269         /* The power button on the Iomega NAS100d is on GPIO 14, but
 270          * it cannot handle interrupts on that GPIO line.  So we'll
 271          * have to poll it with a kernel timer.
 272          */
 273
 274         /* Make sure that the power button GPIO is set up as an input */
 275         gpio_line_config(NAS100D_PB_GPIO, IXP4XX_GPIO_IN);
 276
 277         /* Set the initial value for the power button IRQ handler */
 278         power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
 279
 280         mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500));
 281
 282         /*
 283          * Map in a portion of the flash and read the MAC address.
 284          * Since it is stored in BE in the flash itself, we need to
 285          * byteswap it if we're in LE mode.
 286          */
 287         f = ioremap(IXP4XX_EXP_BUS_BASE(0), 0x1000000);
 288         if (f) {
 289                 for (i = 0; i < 6; i++)
 290 #ifdef __ARMEB__
 291                         nas100d_plat_eth[0].hwaddr[i] = readb(f + 0xFC0FD8 + i);
 292 #else
 293                         nas100d_plat_eth[0].hwaddr[i] = readb(f + 0xFC0FD8 + (i^3));
 294 #endif
 295                 iounmap(f);
 296         }
 297         printk(KERN_INFO "NAS100D: Using MAC address %s for port 0\n",
 298                print_mac(mac_buf, nas100d_plat_eth[0].hwaddr));
 299
 300 }
 301
 302 MACHINE_START(NAS100D, "Iomega NAS 100d")
 303         /* Maintainer: www.nslu2-linux.org */
 304         .phys_io        = IXP4XX_PERIPHERAL_BASE_PHYS,
 305         .io_pg_offst    = ((IXP4XX_PERIPHERAL_BASE_VIRT) >> 18) & 0xFFFC,
 306         .boot_params    = 0x00000100,
 307         .map_io         = ixp4xx_map_io,
 308         .init_irq       = ixp4xx_init_irq,
 309         .timer          = &ixp4xx_timer,
 310         .init_machine   = nas100d_init,
 311 MACHINE_END