1 files changed, 92 insertions, 0 deletions

diff --git a/arch/arm/mach-ixp4xx/nslu2-power.c b/arch/arm/mach-ixp4xx/nslu2-power.c
new file mode 100644
index 000000000000..18fbc8c0fb30
--- /dev/null
+++ b/arch/arm/mach-ixp4xx/nslu2-power.c
@@ -0,0 +1,92 @@
+/*
+ * arch/arm/mach-ixp4xx/nslu2-power.c
+ *
+ * NSLU2 Power/Reset driver
+ *
+ * Copyright (C) 2005 Tower Technologies
+ *
+ * based on nslu2-io.c
+ *  Copyright (C) 2004 Karen Spearel
+ *
+ * Author: Alessandro Zummo <a.zummo@towertech.it>
+ * Maintainers: http://www.nslu2-linux.org/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/reboot.h>
+#include <linux/interrupt.h>
+
+#include <asm/mach-types.h>
+
+extern void ctrl_alt_del(void);
+
+static irqreturn_t nslu2_power_handler(int irq, void *dev_id, struct pt_regs *regs)
+{
+        /* Signal init to do the ctrlaltdel action, this will bypass init if
+         * it hasn't started and do a kernel_restart.
+         */
+        ctrl_alt_del();
+
+        return IRQ_HANDLED;
+}
+
+static irqreturn_t nslu2_reset_handler(int irq, void *dev_id, struct pt_regs *regs)
+{
+        /* This is the paper-clip reset, it shuts the machine down directly.
+         */
+        machine_power_off();
+
+        return IRQ_HANDLED;
+}
+
+static int __init nslu2_power_init(void)
+{
+        if (!(machine_is_nslu2()))
+                return 0;
+
+        *IXP4XX_GPIO_GPISR = 0x20400000;        /* read the 2 irqs to clr */
+
+        set_irq_type(NSLU2_RB_IRQ, IRQT_LOW);
+        set_irq_type(NSLU2_PB_IRQ, IRQT_HIGH);
+
+        gpio_line_isr_clear(NSLU2_RB_GPIO);
+        gpio_line_isr_clear(NSLU2_PB_GPIO);
+
+        if (request_irq(NSLU2_RB_IRQ, &nslu2_reset_handler,
+                SA_INTERRUPT, "NSLU2 reset button", NULL) < 0) {
+
+                printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
+                        NSLU2_RB_IRQ);
+
+                return -EIO;
+        }
+
+        if (request_irq(NSLU2_PB_IRQ, &nslu2_power_handler,
+                SA_INTERRUPT, "NSLU2 power button", NULL) < 0) {
+
+                printk(KERN_DEBUG "Power Button IRQ %d not available\n",
+                        NSLU2_PB_IRQ);
+
+                return -EIO;
+        }
+
+        return 0;
+}
+
+static void __exit nslu2_power_exit(void)
+{
+        free_irq(NSLU2_RB_IRQ, NULL);
+        free_irq(NSLU2_PB_IRQ, NULL);
+}
+
+module_init(nslu2_power_init);
+module_exit(nslu2_power_exit);
+
+MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
+MODULE_DESCRIPTION("NSLU2 Power/Reset driver");
+MODULE_LICENSE("GPL");