Merge branch 'for-linus' of git://oss.sgi.com:8090/xfs/xfs-2.6

[linux-2.6] / arch / arm / mach-ixp4xx / nas100d-setup.c

diff --git a/arch/arm/mach-ixp4xx/nas100d-setup.c b/arch/arm/mach-ixp4xx/nas100d-setup.c
index a432226b2050e11d1066d4ae6d27ef3ef16f1a51..159e1c4f1edaa789deb76336aa1616fd38c02c1c 100644 (file)
--- a/arch/arm/mach-ixp4xx/nas100d-setup.c
+++ b/arch/arm/mach-ixp4xx/nas100d-setup.c
@@ -3,8 +3,14 @@
  *
  * NAS 100d board-setup
  *
- * based ixdp425-setup.c:
+ * Copyright (C) 2008 Rod Whitby <rod@whitby.id.au>
+ *
+ * based on ixdp425-setup.c:
  *      Copyright (C) 2003-2004 MontaVista Software, Inc.
+ * based on nas100d-power.c:
+ *     Copyright (C) 2005 Tower Technologies
+ * based on nas100d-io.c
+ *     Copyright (C) 2004 Karen Spearel
  *
  * Author: Alessandro Zummo <a.zummo@towertech.it>
  * Author: Rod Whitby <rod@whitby.id.au>
@@ -13,10 +19,13 @@
  */
 
 #include <linux/if_ether.h>
-#include <linux/kernel.h>
+#include <linux/irq.h>
+#include <linux/jiffies.h>
+#include <linux/timer.h>
 #include <linux/serial.h>
 #include <linux/serial_8250.h>
 #include <linux/leds.h>
+#include <linux/reboot.h>
 #include <linux/i2c.h>
 #include <linux/i2c-gpio.h>
 
@@ -24,6 +33,7 @@
 #include <asm/mach/arch.h>
 #include <asm/mach/flash.h>
 #include <asm/io.h>
+#include <asm/gpio.h>
 
 static struct flash_platform_data nas100d_flash_data = {
        .map_name               = "cfi_probe",
@@ -50,17 +60,17 @@ static struct i2c_board_info __initdata nas100d_i2c_board_info [] = {
 
 static struct gpio_led nas100d_led_pins[] = {
        {
-               .name           = "wlan",   /* green led */
+               .name           = "nas100d:green:wlan",
                .gpio           = NAS100D_LED_WLAN_GPIO,
                .active_low     = true,
        },
        {
-               .name           = "power",  /* blue power led (off=flashing) */
+               .name           = "nas100d:blue:power",  /* (off=flashing) */
                .gpio           = NAS100D_LED_PWR_GPIO,
                .active_low     = true,
        },
        {
-               .name           = "disk",   /* yellow led */
+               .name           = "nas100d:yellow:disk",
                .gpio           = NAS100D_LED_DISK_GPIO,
                .active_low     = true,
        },
@@ -168,6 +178,57 @@ static void nas100d_power_off(void)
        gpio_line_set(NAS100D_PO_GPIO, IXP4XX_GPIO_HIGH);
 }
 
+/* This is used to make sure the power-button pusher is serious.  The button
+ * must be held until the value of this counter reaches zero.
+ */
+static int power_button_countdown;
+
+/* Must hold the button down for at least this many counts to be processed */
+#define PBUTTON_HOLDDOWN_COUNT 4 /* 2 secs */
+
+static void nas100d_power_handler(unsigned long data);
+static DEFINE_TIMER(nas100d_power_timer, nas100d_power_handler, 0, 0);
+
+static void nas100d_power_handler(unsigned long data)
+{
+       /* This routine is called twice per second to check the
+        * state of the power button.
+        */
+
+       if (gpio_get_value(NAS100D_PB_GPIO)) {
+
+               /* IO Pin is 1 (button pushed) */
+               if (power_button_countdown > 0)
+                       power_button_countdown--;
+
+       } else {
+
+               /* Done on button release, to allow for auto-power-on mods. */
+               if (power_button_countdown == 0) {
+                       /* Signal init to do the ctrlaltdel action,
+                        * this will bypass init if it hasn't started
+                        * and do a kernel_restart.
+                        */
+                       ctrl_alt_del();
+
+                       /* Change the state of the power LED to "blink" */
+                       gpio_line_set(NAS100D_LED_PWR_GPIO, IXP4XX_GPIO_LOW);
+               } else {
+                       power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
+               }
+       }
+
+       mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500));
+}
+
+static irqreturn_t nas100d_reset_handler(int irq, void *dev_id)
+{
+       /* This is the paper-clip reset, it shuts the machine down directly. */
+       machine_power_off();
+
+       return IRQ_HANDLED;
+}
+
 static void __init nas100d_init(void)
 {
        DECLARE_MAC_BUF(mac_buf);
@@ -183,8 +244,6 @@ static void __init nas100d_init(void)
        nas100d_flash_resource.end =
                IXP4XX_EXP_BUS_BASE(0) + ixp4xx_exp_bus_size - 1;
 
-       pm_power_off = nas100d_power_off;
-
        i2c_register_board_info(0, nas100d_i2c_board_info,
                                ARRAY_SIZE(nas100d_i2c_board_info));
 
@@ -197,6 +256,29 @@ static void __init nas100d_init(void)
 
        platform_add_devices(nas100d_devices, ARRAY_SIZE(nas100d_devices));
 
+       pm_power_off = nas100d_power_off;
+
+       if (request_irq(gpio_to_irq(NAS100D_RB_GPIO), &nas100d_reset_handler,
+               IRQF_DISABLED | IRQF_TRIGGER_LOW,
+               "NAS100D reset button", NULL) < 0) {
+
+               printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
+                       gpio_to_irq(NAS100D_RB_GPIO));
+       }
+
+       /* The power button on the Iomega NAS100d is on GPIO 14, but
+        * it cannot handle interrupts on that GPIO line.  So we'll
+        * have to poll it with a kernel timer.
+        */
+
+       /* Make sure that the power button GPIO is set up as an input */
+       gpio_line_config(NAS100D_PB_GPIO, IXP4XX_GPIO_IN);
+
+       /* Set the initial value for the power button IRQ handler */
+       power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
+
+       mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500));
+
        /*
         * Map in a portion of the flash and read the MAC address.
         * Since it is stored in BE in the flash itself, we need to