sh: R7780RP push-switch support.

This adds simple push-switch support for the RDBRP-1/RDBREVRP-1 debug
boards found on the R7780RP-1.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

2 files changed, 125 insertions, 1 deletions

diff --git a/arch/sh/boards/renesas/r7780rp/Makefile b/arch/sh/boards/renesas/r7780rp/Makefile
index f1776d027978..574b0316ed56 100644
--- a/arch/sh/boards/renesas/r7780rp/Makefile
+++ b/arch/sh/boards/renesas/r7780rp/Makefile
@@ -3,4 +3,6 @@
 #
 
 obj-y    := setup.o io.o irq.o
-obj-$(CONFIG_HEARTBEAT) += led.o
+
+obj-$(CONFIG_HEARTBEAT)         += led.o
+obj-$(CONFIG_PUSH_SWITCH)       += psw.o
diff --git a/arch/sh/boards/renesas/r7780rp/psw.c b/arch/sh/boards/renesas/r7780rp/psw.c
new file mode 100644
index 000000000000..c844dfa5d58d
--- /dev/null
+++ b/arch/sh/boards/renesas/r7780rp/psw.c
@@ -0,0 +1,122 @@
+/*
+ * arch/sh/boards/renesas/r7780rp/psw.c
+ *
+ * push switch support for RDBRP-1/RDBREVRP-1 debug boards.
+ *
+ * Copyright (C) 2006  Paul Mundt
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/io.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <asm/mach/r7780rp.h>
+#include <asm/push-switch.h>
+
+static irqreturn_t psw_irq_handler(int irq, void *arg)
+{
+        struct platform_device *pdev = arg;
+        struct push_switch *psw = platform_get_drvdata(pdev);
+        struct push_switch_platform_info *psw_info = pdev->dev.platform_data;
+        unsigned int l, mask;
+        int ret = 0;
+
+        l = ctrl_inw(PA_DBSW);
+
+        /* Nothing to do if there's no state change */
+        if (psw->state) {
+                ret = 1;
+                goto out;
+        }
+
+        mask = l & 0x70;
+        /* Figure out who raised it */
+        if (mask & (1 << psw_info->bit)) {
+                psw->state = !!(mask & (1 << psw_info->bit));
+                if (psw->state) /* debounce */
+                        mod_timer(&psw->debounce, jiffies + 50);
+
+                ret = 1;
+        }
+
+out:
+        /* Clear the switch IRQs */
+        l |= (0x7 << 12);
+        ctrl_outw(l, PA_DBSW);
+
+        return IRQ_RETVAL(ret);
+}
+
+static struct resource psw_resources[] = {
+        [0] = {
+                .start  = IRQ_PSW,
+                .flags  = IORESOURCE_IRQ,
+        },
+};
+
+static struct push_switch_platform_info s2_platform_data = {
+        .name           = "s2",
+        .bit            = 6,
+        .irq_flags      = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
+                          IRQF_SHARED,
+        .irq_handler    = psw_irq_handler,
+};
+
+static struct platform_device s2_switch_device = {
+        .name           = "push-switch",
+        .id             = 0,
+        .num_resources  = ARRAY_SIZE(psw_resources),
+        .resource       = psw_resources,
+        .dev            = {
+                .platform_data = &s2_platform_data,
+        },
+};
+
+static struct push_switch_platform_info s3_platform_data = {
+        .name           = "s3",
+        .bit            = 5,
+        .irq_flags      = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
+                          IRQF_SHARED,
+        .irq_handler    = psw_irq_handler,
+};
+
+static struct platform_device s3_switch_device = {
+        .name           = "push-switch",
+        .id             = 1,
+        .num_resources  = ARRAY_SIZE(psw_resources),
+        .resource       = psw_resources,
+        .dev            = {
+                .platform_data = &s3_platform_data,
+        },
+};
+
+static struct push_switch_platform_info s4_platform_data = {
+        .name           = "s4",
+        .bit            = 4,
+        .irq_flags      = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
+                          IRQF_SHARED,
+        .irq_handler    = psw_irq_handler,
+};
+
+static struct platform_device s4_switch_device = {
+        .name           = "push-switch",
+        .id             = 2,
+        .num_resources  = ARRAY_SIZE(psw_resources),
+        .resource       = psw_resources,
+        .dev            = {
+                .platform_data = &s4_platform_data,
+        },
+};
+
+static struct platform_device *psw_devices[] = {
+        &s2_switch_device, &s3_switch_device, &s4_switch_device,
+};
+
+static int __init psw_init(void)
+{
+        return platform_add_devices(psw_devices, ARRAY_SIZE(psw_devices));
+}
+module_init(psw_init);