release/src-rt-6.x.4708/linux/linux-2.6.36/arch/mips/bcm47xx/wgt634u.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2007 Aurelien Jarno <aurelien@aurel32.net>
   7  */
   8
   9 #include <linux/platform_device.h>
  10 #include <linux/module.h>
  11 #include <linux/leds.h>
  12 #include <linux/mtd/physmap.h>
  13 #include <linux/ssb/ssb.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/reboot.h>
  16 #include <linux/gpio.h>
  17 #include <asm/mach-bcm47xx/bcm47xx.h>
  18
  19 /* GPIO definitions for the WGT634U */
  20 #define WGT634U_GPIO_LED        3
  21 #define WGT634U_GPIO_RESET      2
  22 #define WGT634U_GPIO_TP1        7
  23 #define WGT634U_GPIO_TP2        6
  24 #define WGT634U_GPIO_TP3        5
  25 #define WGT634U_GPIO_TP4        4
  26 #define WGT634U_GPIO_TP5        1
  27
  28 static struct gpio_led wgt634u_leds[] = {
  29         {
  30                 .name = "power",
  31                 .gpio = WGT634U_GPIO_LED,
  32                 .active_low = 1,
  33                 .default_trigger = "heartbeat",
  34         },
  35 };
  36
  37 static struct gpio_led_platform_data wgt634u_led_data = {
  38         .num_leds =     ARRAY_SIZE(wgt634u_leds),
  39         .leds =         wgt634u_leds,
  40 };
  41
  42 static struct platform_device wgt634u_gpio_leds = {
  43         .name =         "leds-gpio",
  44         .id =           -1,
  45         .dev = {
  46                 .platform_data = &wgt634u_led_data,
  47         }
  48 };
  49
  50
  51 /* 8MiB flash. The struct mtd_partition matches original Netgear WGT634U
  52    firmware. */
  53 static struct mtd_partition wgt634u_partitions[] = {
  54         {
  55                 .name       = "cfe",
  56                 .offset     = 0,
  57                 .size       = 0x60000,          /* 384k */
  58                 .mask_flags = MTD_WRITEABLE     /* force read-only */
  59         },
  60         {
  61                 .name   = "config",
  62                 .offset = 0x60000,
  63                 .size   = 0x20000               /* 128k */
  64         },
  65         {
  66                 .name   = "linux",
  67                 .offset = 0x80000,
  68                 .size   = 0x140000              /* 1280k */
  69         },
  70         {
  71                 .name   = "jffs",
  72                 .offset = 0x1c0000,
  73                 .size   = 0x620000              /* 6272k */
  74         },
  75         {
  76                 .name   = "nvram",
  77                 .offset = 0x7e0000,
  78                 .size   = 0x20000               /* 128k */
  79         },
  80 };
  81
  82 static struct physmap_flash_data wgt634u_flash_data = {
  83         .parts    = wgt634u_partitions,
  84         .nr_parts = ARRAY_SIZE(wgt634u_partitions)
  85 };
  86
  87 static struct resource wgt634u_flash_resource = {
  88         .flags = IORESOURCE_MEM,
  89 };
  90
  91 static struct platform_device wgt634u_flash = {
  92         .name          = "physmap-flash",
  93         .id            = 0,
  94         .dev           = { .platform_data = &wgt634u_flash_data, },
  95         .resource      = &wgt634u_flash_resource,
  96         .num_resources = 1,
  97 };
  98
  99 /* Platform devices */
 100 static struct platform_device *wgt634u_devices[] __initdata = {
 101         &wgt634u_flash,
 102         &wgt634u_gpio_leds,
 103 };
 104
 105 static irqreturn_t gpio_interrupt(int irq, void *ignored)
 106 {
 107         int state;
 108
 109         /* Interrupts are shared, check if the current one is
 110            a GPIO interrupt. */
 111         if (!ssb_chipco_irq_status(&ssb_bcm47xx.chipco,
 112                                    SSB_CHIPCO_IRQ_GPIO))
 113                 return IRQ_NONE;
 114
 115         state = gpio_get_value(WGT634U_GPIO_RESET);
 116
 117         /* Interrupt are level triggered, revert the interrupt polarity
 118            to clear the interrupt. */
 119         gpio_polarity(WGT634U_GPIO_RESET, state);
 120
 121         if (!state) {
 122                 printk(KERN_INFO "Reset button pressed");
 123                 ctrl_alt_del();
 124         }
 125
 126         return IRQ_HANDLED;
 127 }
 128
 129 static int __init wgt634u_init(void)
 130 {
 131         /* There is no easy way to detect that we are running on a WGT634U
 132          * machine. Use the MAC address as an heuristic. Netgear Inc. has
 133          * been allocated ranges 00:09:5b:xx:xx:xx and 00:0f:b5:xx:xx:xx.
 134          */
 135
 136         u8 *et0mac = ssb_bcm47xx.sprom.et0mac;
 137
 138         if (et0mac[0] == 0x00 &&
 139             ((et0mac[1] == 0x09 && et0mac[2] == 0x5b) ||
 140              (et0mac[1] == 0x0f && et0mac[2] == 0xb5))) {
 141                 struct ssb_mipscore *mcore = &ssb_bcm47xx.mipscore;
 142
 143                 printk(KERN_INFO "WGT634U machine detected.\n");
 144
 145                 if (!request_irq(gpio_to_irq(WGT634U_GPIO_RESET),
 146                                  gpio_interrupt, IRQF_SHARED,
 147                                  "WGT634U GPIO", &ssb_bcm47xx.chipco)) {
 148                         gpio_direction_input(WGT634U_GPIO_RESET);
 149                         gpio_intmask(WGT634U_GPIO_RESET, 1);
 150                         ssb_chipco_irq_mask(&ssb_bcm47xx.chipco,
 151                                             SSB_CHIPCO_IRQ_GPIO,
 152                                             SSB_CHIPCO_IRQ_GPIO);
 153                 }
 154
 155                 wgt634u_flash_data.width = mcore->flash_buswidth;
 156                 wgt634u_flash_resource.start = mcore->flash_window;
 157                 wgt634u_flash_resource.end = mcore->flash_window
 158                                            + mcore->flash_window_size
 159                                            - 1;
 160                 return platform_add_devices(wgt634u_devices,
 161                                             ARRAY_SIZE(wgt634u_devices));
 162         } else
 163                 return -ENODEV;
 164 }
 165
 166 module_init(wgt634u_init);