arch/arm/mach-ixp4xx/nslu2-setup.c

   1 /*
   2  * arch/arm/mach-ixp4xx/nslu2-setup.c
   3  *
   4  * NSLU2 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 nslu2-power.c:
  11  *      Copyright (C) 2005 Tower Technologies
  12  *
  13  * Author: Mark Rakes <mrakes at mac.com>
  14  * Author: Rod Whitby <rod@whitby.id.au>
  15  * Author: Alessandro Zummo <a.zummo@towertech.it>
  16  * Maintainers: http://www.nslu2-linux.org/
  17  *
  18  */
  19 #include <linux/gpio.h>
  20 #include <linux/if_ether.h>
  21 #include <linux/irq.h>
  22 #include <linux/serial.h>
  23 #include <linux/serial_8250.h>
  24 #include <linux/leds.h>
  25 #include <linux/reboot.h>
  26 #include <linux/i2c.h>
  27 #include <linux/i2c-gpio.h>
  28 #include <linux/io.h>
  29 #include <asm/mach-types.h>
  30 #include <asm/mach/arch.h>
  31 #include <asm/mach/flash.h>
  32 #include <asm/mach/time.h>
  33
  34 #define NSLU2_SDA_PIN           7
  35 #define NSLU2_SCL_PIN           6
  36
  37 /* NSLU2 Timer */
  38 #define NSLU2_FREQ 66000000
  39
  40 /* Buttons */
  41 #define NSLU2_PB_GPIO           5       /* power button */
  42 #define NSLU2_PO_GPIO           8       /* power off */
  43 #define NSLU2_RB_GPIO           12      /* reset button */
  44
  45 /* Buzzer */
  46 #define NSLU2_GPIO_BUZZ         4
  47
  48 /* LEDs */
  49 #define NSLU2_LED_RED_GPIO      0
  50 #define NSLU2_LED_GRN_GPIO      1
  51 #define NSLU2_LED_DISK1_GPIO    3
  52 #define NSLU2_LED_DISK2_GPIO    2
  53
  54 static struct flash_platform_data nslu2_flash_data = {
  55         .map_name               = "cfi_probe",
  56         .width                  = 2,
  57 };
  58
  59 static struct resource nslu2_flash_resource = {
  60         .flags                  = IORESOURCE_MEM,
  61 };
  62
  63 static struct platform_device nslu2_flash = {
  64         .name                   = "IXP4XX-Flash",
  65         .id                     = 0,
  66         .dev.platform_data      = &nslu2_flash_data,
  67         .num_resources          = 1,
  68         .resource               = &nslu2_flash_resource,
  69 };
  70
  71 static struct i2c_gpio_platform_data nslu2_i2c_gpio_data = {
  72         .sda_pin                = NSLU2_SDA_PIN,
  73         .scl_pin                = NSLU2_SCL_PIN,
  74 };
  75
  76 static struct i2c_board_info __initdata nslu2_i2c_board_info [] = {
  77         {
  78                 I2C_BOARD_INFO("x1205", 0x6f),
  79         },
  80 };
  81
  82 static struct gpio_led nslu2_led_pins[] = {
  83         {
  84                 .name           = "nslu2:green:ready",
  85                 .gpio           = NSLU2_LED_GRN_GPIO,
  86         },
  87         {
  88                 .name           = "nslu2:red:status",
  89                 .gpio           = NSLU2_LED_RED_GPIO,
  90         },
  91         {
  92                 .name           = "nslu2:green:disk-1",
  93                 .gpio           = NSLU2_LED_DISK1_GPIO,
  94                 .active_low     = true,
  95         },
  96         {
  97                 .name           = "nslu2:green:disk-2",
  98                 .gpio           = NSLU2_LED_DISK2_GPIO,
  99                 .active_low     = true,
 100         },
 101 };
 102
 103 static struct gpio_led_platform_data nslu2_led_data = {
 104         .num_leds               = ARRAY_SIZE(nslu2_led_pins),
 105         .leds                   = nslu2_led_pins,
 106 };
 107
 108 static struct platform_device nslu2_leds = {
 109         .name                   = "leds-gpio",
 110         .id                     = -1,
 111         .dev.platform_data      = &nslu2_led_data,
 112 };
 113
 114 static struct platform_device nslu2_i2c_gpio = {
 115         .name                   = "i2c-gpio",
 116         .id                     = 0,
 117         .dev     = {
 118                 .platform_data  = &nslu2_i2c_gpio_data,
 119         },
 120 };
 121
 122 static struct platform_device nslu2_beeper = {
 123         .name                   = "ixp4xx-beeper",
 124         .id                     = NSLU2_GPIO_BUZZ,
 125         .num_resources          = 0,
 126 };
 127
 128 static struct resource nslu2_uart_resources[] = {
 129         {
 130                 .start          = IXP4XX_UART1_BASE_PHYS,
 131                 .end            = IXP4XX_UART1_BASE_PHYS + 0x0fff,
 132                 .flags          = IORESOURCE_MEM,
 133         },
 134         {
 135                 .start          = IXP4XX_UART2_BASE_PHYS,
 136                 .end            = IXP4XX_UART2_BASE_PHYS + 0x0fff,
 137                 .flags          = IORESOURCE_MEM,
 138         }
 139 };
 140
 141 static struct plat_serial8250_port nslu2_uart_data[] = {
 142         {
 143                 .mapbase        = IXP4XX_UART1_BASE_PHYS,
 144                 .membase        = (char *)IXP4XX_UART1_BASE_VIRT + REG_OFFSET,
 145                 .irq            = IRQ_IXP4XX_UART1,
 146                 .flags          = UPF_BOOT_AUTOCONF,
 147                 .iotype         = UPIO_MEM,
 148                 .regshift       = 2,
 149                 .uartclk        = IXP4XX_UART_XTAL,
 150         },
 151         {
 152                 .mapbase        = IXP4XX_UART2_BASE_PHYS,
 153                 .membase        = (char *)IXP4XX_UART2_BASE_VIRT + REG_OFFSET,
 154                 .irq            = IRQ_IXP4XX_UART2,
 155                 .flags          = UPF_BOOT_AUTOCONF,
 156                 .iotype         = UPIO_MEM,
 157                 .regshift       = 2,
 158                 .uartclk        = IXP4XX_UART_XTAL,
 159         },
 160         { }
 161 };
 162
 163 static struct platform_device nslu2_uart = {
 164         .name                   = "serial8250",
 165         .id                     = PLAT8250_DEV_PLATFORM,
 166         .dev.platform_data      = nslu2_uart_data,
 167         .num_resources          = 2,
 168         .resource               = nslu2_uart_resources,
 169 };
 170
 171 /* Built-in 10/100 Ethernet MAC interfaces */
 172 static struct eth_plat_info nslu2_plat_eth[] = {
 173         {
 174                 .phy            = 1,
 175                 .rxq            = 3,
 176                 .txreadyq       = 20,
 177         }
 178 };
 179
 180 static struct platform_device nslu2_eth[] = {
 181         {
 182                 .name                   = "ixp4xx_eth",
 183                 .id                     = IXP4XX_ETH_NPEB,
 184                 .dev.platform_data      = nslu2_plat_eth,
 185         }
 186 };
 187
 188 static struct platform_device *nslu2_devices[] __initdata = {
 189         &nslu2_i2c_gpio,
 190         &nslu2_flash,
 191         &nslu2_beeper,
 192         &nslu2_leds,
 193         &nslu2_eth[0],
 194 };
 195
 196 static void nslu2_power_off(void)
 197 {
 198         /* This causes the box to drop the power and go dead. */
 199
 200         /* enable the pwr cntl gpio and assert power off */
 201         gpio_direction_output(NSLU2_PO_GPIO, 1);
 202 }
 203
 204 static irqreturn_t nslu2_power_handler(int irq, void *dev_id)
 205 {
 206         /* Signal init to do the ctrlaltdel action, this will bypass init if
 207          * it hasn't started and do a kernel_restart.
 208          */
 209         ctrl_alt_del();
 210
 211         return IRQ_HANDLED;
 212 }
 213
 214 static irqreturn_t nslu2_reset_handler(int irq, void *dev_id)
 215 {
 216         /* This is the paper-clip reset, it shuts the machine down directly.
 217          */
 218         machine_power_off();
 219
 220         return IRQ_HANDLED;
 221 }
 222
 223 static int __init nslu2_gpio_init(void)
 224 {
 225         if (!machine_is_nslu2())
 226                 return 0;
 227
 228         /* Request the power off GPIO */
 229         return gpio_request(NSLU2_PO_GPIO, "power off");
 230 }
 231 device_initcall(nslu2_gpio_init);
 232
 233 static void __init nslu2_timer_init(void)
 234 {
 235     /* The xtal on this machine is non-standard. */
 236     ixp4xx_timer_freq = NSLU2_FREQ;
 237
 238     /* Call standard timer_init function. */
 239     ixp4xx_timer_init();
 240 }
 241
 242 static void __init nslu2_init(void)
 243 {
 244         uint8_t __iomem *f;
 245         int i;
 246
 247         ixp4xx_sys_init();
 248
 249         nslu2_flash_resource.start = IXP4XX_EXP_BUS_BASE(0);
 250         nslu2_flash_resource.end =
 251                 IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
 252
 253         i2c_register_board_info(0, nslu2_i2c_board_info,
 254                                 ARRAY_SIZE(nslu2_i2c_board_info));
 255
 256         /*
 257          * This is only useful on a modified machine, but it is valuable
 258          * to have it first in order to see debug messages, and so that
 259          * it does *not* get removed if platform_add_devices fails!
 260          */
 261         (void)platform_device_register(&nslu2_uart);
 262
 263         platform_add_devices(nslu2_devices, ARRAY_SIZE(nslu2_devices));
 264
 265         pm_power_off = nslu2_power_off;
 266
 267         if (request_irq(gpio_to_irq(NSLU2_RB_GPIO), &nslu2_reset_handler,
 268                 IRQF_DISABLED | IRQF_TRIGGER_LOW,
 269                 "NSLU2 reset button", NULL) < 0) {
 270
 271                 printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
 272                         gpio_to_irq(NSLU2_RB_GPIO));
 273         }
 274
 275         if (request_irq(gpio_to_irq(NSLU2_PB_GPIO), &nslu2_power_handler,
 276                 IRQF_DISABLED | IRQF_TRIGGER_HIGH,
 277                 "NSLU2 power button", NULL) < 0) {
 278
 279                 printk(KERN_DEBUG "Power Button IRQ %d not available\n",
 280                         gpio_to_irq(NSLU2_PB_GPIO));
 281         }
 282
 283         /*
 284          * Map in a portion of the flash and read the MAC address.
 285          * Since it is stored in BE in the flash itself, we need to
 286          * byteswap it if we're in LE mode.
 287          */
 288         f = ioremap(IXP4XX_EXP_BUS_BASE(0), 0x40000);
 289         if (f) {
 290                 for (i = 0; i < 6; i++)
 291 #ifdef __ARMEB__
 292                         nslu2_plat_eth[0].hwaddr[i] = readb(f + 0x3FFB0 + i);
 293 #else
 294                         nslu2_plat_eth[0].hwaddr[i] = readb(f + 0x3FFB0 + (i^3));
 295 #endif
 296                 iounmap(f);
 297         }
 298         printk(KERN_INFO "NSLU2: Using MAC address %pM for port 0\n",
 299                nslu2_plat_eth[0].hwaddr);
 300
 301 }
 302
 303 MACHINE_START(NSLU2, "Linksys NSLU2")
 304         /* Maintainer: www.nslu2-linux.org */
 305         .atag_offset    = 0x100,
 306         .map_io         = ixp4xx_map_io,
 307         .init_early     = ixp4xx_init_early,
 308         .init_irq       = ixp4xx_init_irq,
 309         .init_time      = nslu2_timer_init,
 310         .init_machine   = nslu2_init,
 311 #if defined(CONFIG_PCI)
 312         .dma_zone_size  = SZ_64M,
 313 #endif
 314         .restart        = ixp4xx_restart,
 315 MACHINE_END