LXR linux/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
  28static 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
  37static struct gpio_led_platform_data wgt634u_led_data = {
  38        .num_leds =     ARRAY_SIZE(wgt634u_leds),
  39        .leds =         wgt634u_leds,
  40};
  41
  42static 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. */
  53static 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
  82static struct physmap_flash_data wgt634u_flash_data = {
  83        .parts    = wgt634u_partitions,
  84        .nr_parts = ARRAY_SIZE(wgt634u_partitions)
  85};
  86
  87static struct resource wgt634u_flash_resource = {
  88        .flags = IORESOURCE_MEM,
  89};
  90
  91static 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 */
 100static struct platform_device *wgt634u_devices[] __initdata = {
 101        &wgt634u_flash,
 102        &wgt634u_gpio_leds,
 103};
 104
 105static 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(&bcm47xx_bus.ssb.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
 129static 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        u8 *et0mac;
 136
 137        if (bcm47xx_bus_type != BCM47XX_BUS_TYPE_SSB)
 138                return -ENODEV;
 139
 140        et0mac = bcm47xx_bus.ssb.sprom.et0mac;
 141
 142        if (et0mac[0] == 0x00 &&
 143            ((et0mac[1] == 0x09 && et0mac[2] == 0x5b) ||
 144             (et0mac[1] == 0x0f && et0mac[2] == 0xb5))) {
 145                struct ssb_mipscore *mcore = &bcm47xx_bus.ssb.mipscore;
 146
 147                printk(KERN_INFO "WGT634U machine detected.\n");
 148
 149                if (!request_irq(gpio_to_irq(WGT634U_GPIO_RESET),
 150                                 gpio_interrupt, IRQF_SHARED,
 151                                 "WGT634U GPIO", &bcm47xx_bus.ssb.chipco)) {
 152                        gpio_direction_input(WGT634U_GPIO_RESET);
 153                        gpio_intmask(WGT634U_GPIO_RESET, 1);
 154                        ssb_chipco_irq_mask(&bcm47xx_bus.ssb.chipco,
 155                                            SSB_CHIPCO_IRQ_GPIO,
 156                                            SSB_CHIPCO_IRQ_GPIO);
 157                }
 158
 159                wgt634u_flash_data.width = mcore->flash_buswidth;
 160                wgt634u_flash_resource.start = mcore->flash_window;
 161                wgt634u_flash_resource.end = mcore->flash_window
 162                                           + mcore->flash_window_size
 163                                           - 1;
 164                return platform_add_devices(wgt634u_devices,
 165                                            ARRAY_SIZE(wgt634u_devices));
 166        } else
 167                return -ENODEV;
 168}
 169
 170module_init(wgt634u_init);
 171