1 files changed, 174 insertions, 0 deletions

diff --git a/kernel/arch/arm/plat-omap/debug-leds.c b/kernel/arch/arm/plat-omap/debug-leds.c
new file mode 100644
index 000000000..48b69de89
--- /dev/null
+++ b/kernel/arch/arm/plat-omap/debug-leds.c
@@ -0,0 +1,174 @@
+/*
+ * linux/arch/arm/plat-omap/debug-leds.c
+ *
+ * Copyright 2011 by Bryan Wu <bryan.wu@canonical.com>
+ * Copyright 2003 by Texas Instruments Incorporated
+ *
+ * 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/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <linux/io.h>
+#include <linux/platform_data/gpio-omap.h>
+#include <linux/slab.h>
+
+#include <asm/mach-types.h>
+
+/* Many OMAP development platforms reuse the same "debug board"; these
+ * platforms include H2, H3, H4, and Perseus2.  There are 16 LEDs on the
+ * debug board (all green), accessed through FPGA registers.
+ */
+
+/* NOTE:  most boards don't have a static mapping for the FPGA ... */
+struct h2p2_dbg_fpga {
+	/* offset 0x00 */
+	u16		smc91x[8];
+	/* offset 0x10 */
+	u16		fpga_rev;
+	u16		board_rev;
+	u16		gpio_outputs;
+	u16		leds;
+	/* offset 0x18 */
+	u16		misc_inputs;
+	u16		lan_status;
+	u16		lan_reset;
+	u16		reserved0;
+	/* offset 0x20 */
+	u16		ps2_data;
+	u16		ps2_ctrl;
+	/* plus also 4 rs232 ports ... */
+};
+
+static struct h2p2_dbg_fpga __iomem *fpga;
+
+static u16 fpga_led_state;
+
+struct dbg_led {
+	struct led_classdev	cdev;
+	u16			mask;
+};
+
+static const struct {
+	const char *name;
+	const char *trigger;
+} dbg_leds[] = {
+	{ "dbg:d4", "heartbeat", },
+	{ "dbg:d5", "cpu0", },
+	{ "dbg:d6", "default-on", },
+	{ "dbg:d7", },
+	{ "dbg:d8", },
+	{ "dbg:d9", },
+	{ "dbg:d10", },
+	{ "dbg:d11", },
+	{ "dbg:d12", },
+	{ "dbg:d13", },
+	{ "dbg:d14", },
+	{ "dbg:d15", },
+	{ "dbg:d16", },
+	{ "dbg:d17", },
+	{ "dbg:d18", },
+	{ "dbg:d19", },
+};
+
+/*
+ * The triggers lines up below will only be used if the
+ * LED triggers are compiled in.
+ */
+static void dbg_led_set(struct led_classdev *cdev,
+			      enum led_brightness b)
+{
+	struct dbg_led *led = container_of(cdev, struct dbg_led, cdev);
+	u16 reg;
+
+	reg = readw_relaxed(&fpga->leds);
+	if (b != LED_OFF)
+		reg |= led->mask;
+	else
+		reg &= ~led->mask;
+	writew_relaxed(reg, &fpga->leds);
+}
+
+static enum led_brightness dbg_led_get(struct led_classdev *cdev)
+{
+	struct dbg_led *led = container_of(cdev, struct dbg_led, cdev);
+	u16 reg;
+
+	reg = readw_relaxed(&fpga->leds);
+	return (reg & led->mask) ? LED_FULL : LED_OFF;
+}
+
+static int fpga_probe(struct platform_device *pdev)
+{
+	struct resource	*iomem;
+	int i;
+
+	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!iomem)
+		return -ENODEV;
+
+	fpga = ioremap(iomem->start, resource_size(iomem));
+	writew_relaxed(0xff, &fpga->leds);
+
+	for (i = 0; i < ARRAY_SIZE(dbg_leds); i++) {
+		struct dbg_led *led;
+
+		led = kzalloc(sizeof(*led), GFP_KERNEL);
+		if (!led)
+			break;
+
+		led->cdev.name = dbg_leds[i].name;
+		led->cdev.brightness_set = dbg_led_set;
+		led->cdev.brightness_get = dbg_led_get;
+		led->cdev.default_trigger = dbg_leds[i].trigger;
+		led->mask = BIT(i);
+
+		if (led_classdev_register(NULL, &led->cdev) < 0) {
+			kfree(led);
+			break;
+		}
+	}
+
+	return 0;
+}
+
+static int fpga_suspend_noirq(struct device *dev)
+{
+	fpga_led_state = readw_relaxed(&fpga->leds);
+	writew_relaxed(0xff, &fpga->leds);
+
+	return 0;
+}
+
+static int fpga_resume_noirq(struct device *dev)
+{
+	writew_relaxed(~fpga_led_state, &fpga->leds);
+	return 0;
+}
+
+static const struct dev_pm_ops fpga_dev_pm_ops = {
+	.suspend_noirq = fpga_suspend_noirq,
+	.resume_noirq = fpga_resume_noirq,
+};
+
+static struct platform_driver led_driver = {
+	.driver.name	= "omap_dbg_led",
+	.driver.pm	= &fpga_dev_pm_ops,
+	.probe		= fpga_probe,
+};
+
+static int __init fpga_init(void)
+{
+	if (machine_is_omap_h4()
+			|| machine_is_omap_h3()
+			|| machine_is_omap_h2()
+			|| machine_is_omap_perseus2()
+			)
+		return platform_driver_register(&led_driver);
+	return 0;
+}
+fs_initcall(fpga_init);