/*
* 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);
