1 files changed, 319 insertions, 0 deletions
diff --git a/arch/arm/plat-omap/debug-leds.c b/arch/arm/plat-omap/debug-leds.c
new file mode 100644
index 000000000000..511d6a50041e
--- /dev/null
+++ b/arch/arm/plat-omap/debug-leds.c
@@ -0,0 +1,319 @@
+/*
+ * linux/arch/arm/plat-omap/debug-leds.c
+ *
+ * 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/init.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+
+#include <asm/io.h>
+#include <asm/hardware.h>
+#include <asm/leds.h>
+#include <asm/system.h>
+#include <asm/mach-types.h>
+
+#include <asm/arch/fpga.h>
+#include <asm/arch/gpio.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.
+ *
+ * The "surfer" expansion board and H2 sample board also have two-color
+ * green+red LEDs (in parallel), used here for timer and idle indicators
+ * in preference to the ones on the debug board, for a "Disco LED" effect.
+ *
+ * This driver exports either the original ARM LED API, the new generic
+ * one, or both.
+ */
+
+static spinlock_t			lock;
+static struct h2p2_dbg_fpga __iomem	*fpga;
+static u16				led_state, hw_led_state;
+
+
+#ifdef	CONFIG_LEDS
+#define old_led_api()	1
+#else
+#define old_led_api()	0
+#endif
+
+#ifdef	CONFIG_LEDS_OMAP_DEBUG
+#define new_led_api()	1
+#else
+#define new_led_api()	0
+#endif
+
+
+/*-------------------------------------------------------------------------*/
+
+/* original ARM debug LED API:
+ *  - timer and idle leds (some boards use non-FPGA leds here);
+ *  - up to 4 generic leds, easily accessed in-kernel (any context)
+ */
+
+#define GPIO_LED_RED		3
+#define GPIO_LED_GREEN		OMAP_MPUIO(4)
+
+#define LED_STATE_ENABLED	0x01
+#define LED_STATE_CLAIMED	0x02
+#define LED_TIMER_ON		0x04
+
+#define GPIO_IDLE		GPIO_LED_GREEN
+#define GPIO_TIMER		GPIO_LED_RED
+
+static void h2p2_dbg_leds_event(led_event_t evt)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&lock, flags);
+
+	if (!(led_state & LED_STATE_ENABLED) && evt != led_start)
+		goto done;
+
+	switch (evt) {
+	case led_start:
+		if (fpga)
+			led_state |= LED_STATE_ENABLED;
+		break;
+
+	case led_stop:
+	case led_halted:
+		/* all leds off during suspend or shutdown */
+
+		if (!(machine_is_omap_perseus2() || machine_is_omap_h4())) {
+			omap_set_gpio_dataout(GPIO_TIMER, 0);
+			omap_set_gpio_dataout(GPIO_IDLE, 0);
+		}
+
+		__raw_writew(~0, &fpga->leds);
+		led_state &= ~LED_STATE_ENABLED;
+		goto done;
+
+	case led_claim:
+		led_state |= LED_STATE_CLAIMED;
+		hw_led_state = 0;
+		break;
+
+	case led_release:
+		led_state &= ~LED_STATE_CLAIMED;
+		break;
+
+#ifdef CONFIG_LEDS_TIMER
+	case led_timer:
+		led_state ^= LED_TIMER_ON;
+
+		if (machine_is_omap_perseus2() || machine_is_omap_h4())
+			hw_led_state ^= H2P2_DBG_FPGA_P2_LED_TIMER;
+		else {
+			omap_set_gpio_dataout(GPIO_TIMER,
+					led_state & LED_TIMER_ON);
+			goto done;
+		}
+
+		break;
+#endif
+
+#ifdef CONFIG_LEDS_CPU
+	/* LED lit iff busy */
+	case led_idle_start:
+		if (machine_is_omap_perseus2() || machine_is_omap_h4())
+			hw_led_state &= ~H2P2_DBG_FPGA_P2_LED_IDLE;
+		else {
+			omap_set_gpio_dataout(GPIO_IDLE, 1);
+			goto done;
+		}
+
+		break;
+
+	case led_idle_end:
+		if (machine_is_omap_perseus2() || machine_is_omap_h4())
+			hw_led_state |= H2P2_DBG_FPGA_P2_LED_IDLE;
+		else {
+			omap_set_gpio_dataout(GPIO_IDLE, 0);
+			goto done;
+		}
+
+		break;
+#endif
+
+	case led_green_on:
+		hw_led_state |= H2P2_DBG_FPGA_LED_GREEN;
+		break;
+	case led_green_off:
+		hw_led_state &= ~H2P2_DBG_FPGA_LED_GREEN;
+		break;
+
+	case led_amber_on:
+		hw_led_state |= H2P2_DBG_FPGA_LED_AMBER;
+		break;
+	case led_amber_off:
+		hw_led_state &= ~H2P2_DBG_FPGA_LED_AMBER;
+		break;
+
+	case led_red_on:
+		hw_led_state |= H2P2_DBG_FPGA_LED_RED;
+		break;
+	case led_red_off:
+		hw_led_state &= ~H2P2_DBG_FPGA_LED_RED;
+		break;
+
+	case led_blue_on:
+		hw_led_state |= H2P2_DBG_FPGA_LED_BLUE;
+		break;
+	case led_blue_off:
+		hw_led_state &= ~H2P2_DBG_FPGA_LED_BLUE;
+		break;
+
+	default:
+		break;
+	}
+
+
+	/*
+	 *  Actually burn the LEDs
+	 */
+	if (led_state & LED_STATE_ENABLED)
+		__raw_writew(~hw_led_state, &fpga->leds);
+
+done:
+	spin_unlock_irqrestore(&lock, flags);
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* "new" LED API
+ *  - with syfs access and generic triggering
+ *  - not readily accessible to in-kernel drivers
+ */
+
+struct dbg_led {
+	struct led_classdev	cdev;
+	u16			mask;
+};
+
+static struct dbg_led dbg_leds[] = {
+	/* REVISIT at least H2 uses different timer & cpu leds... */
+#ifndef CONFIG_LEDS_TIMER
+	{ .mask = 1 << 0,  .cdev.name =  "d4:green", },		/* timer */
+#endif
+#ifndef CONFIG_LEDS_CPU
+	{ .mask = 1 << 1,  .cdev.name =  "d5:green", },		/* !idle */
+#endif
+	{ .mask = 1 << 2,  .cdev.name =  "d6:green", },
+	{ .mask = 1 << 3,  .cdev.name =  "d7:green", },
+
+	{ .mask = 1 << 4,  .cdev.name =  "d8:green", },
+	{ .mask = 1 << 5,  .cdev.name =  "d9:green", },
+	{ .mask = 1 << 6,  .cdev.name = "d10:green", },
+	{ .mask = 1 << 7,  .cdev.name = "d11:green", },
+
+	{ .mask = 1 << 8,  .cdev.name = "d12:green", },
+	{ .mask = 1 << 9,  .cdev.name = "d13:green", },
+	{ .mask = 1 << 10, .cdev.name = "d14:green", },
+	{ .mask = 1 << 11, .cdev.name = "d15:green", },
+
+#ifndef	CONFIG_LEDS
+	{ .mask = 1 << 12, .cdev.name = "d16:green", },
+	{ .mask = 1 << 13, .cdev.name = "d17:green", },
+	{ .mask = 1 << 14, .cdev.name = "d18:green", },
+	{ .mask = 1 << 15, .cdev.name = "d19:green", },
+#endif
+};
+
+static void
+fpga_led_set(struct led_classdev *cdev, enum led_brightness value)
+{
+	struct dbg_led	*led = container_of(cdev, struct dbg_led, cdev);
+	unsigned long	flags;
+
+	spin_lock_irqsave(&lock, flags);
+	if (value == LED_OFF)
+		hw_led_state &= ~led->mask;
+	else
+		hw_led_state |= led->mask;
+	__raw_writew(~hw_led_state, &fpga->leds);
+	spin_unlock_irqrestore(&lock, flags);
+}
+
+static void __init newled_init(struct device *dev)
+{
+	unsigned	i;
+	struct dbg_led	*led;
+	int		status;
+
+	for (i = 0, led = dbg_leds; i < ARRAY_SIZE(dbg_leds); i++, led++) {
+		led->cdev.brightness_set = fpga_led_set;
+		status = led_classdev_register(dev, &led->cdev);
+		if (status < 0)
+			break;
+	}
+	return;
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+static int /* __init */ fpga_probe(struct platform_device *pdev)
+{
+	struct resource	*iomem;
+
+	spin_lock_init(&lock);
+
+	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!iomem)
+		return -ENODEV;
+
+	fpga = ioremap(iomem->start, H2P2_DBG_FPGA_SIZE);
+	__raw_writew(~0, &fpga->leds);
+
+	if (old_led_api()) {
+		leds_event = h2p2_dbg_leds_event;
+		leds_event(led_start);
+	}
+
+	if (new_led_api()) {
+		newled_init(&pdev->dev);
+	}
+
+	return 0;
+}
+
+static int fpga_suspend_late(struct platform_device *pdev, pm_message_t mesg)
+{
+	__raw_writew(~0, &fpga->leds);
+	return 0;
+}
+
+static int fpga_resume_early(struct platform_device *pdev)
+{
+	__raw_writew(~hw_led_state, &fpga->leds);
+	return 0;
+}
+
+
+static struct platform_driver led_driver = {
+	.driver.name	= "omap_dbg_led",
+	.probe		= fpga_probe,
+	.suspend_late	= fpga_suspend_late,
+	.resume_early	= fpga_resume_early,
+};
+
+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);