315 lines
7.0 KiB
C
315 lines
7.0 KiB
C
/*
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* linux/arch/arm/plat-omap/debug-leds.c
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*
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* Copyright 2003 by Texas Instruments Incorporated
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/leds.h>
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#include <asm/io.h>
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#include <asm/hardware.h>
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#include <asm/leds.h>
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#include <asm/system.h>
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#include <asm/mach-types.h>
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#include <asm/arch/fpga.h>
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#include <asm/arch/gpio.h>
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/* Many OMAP development platforms reuse the same "debug board"; these
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* platforms include H2, H3, H4, and Perseus2. There are 16 LEDs on the
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* debug board (all green), accessed through FPGA registers.
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*
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* The "surfer" expansion board and H2 sample board also have two-color
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* green+red LEDs (in parallel), used here for timer and idle indicators
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* in preference to the ones on the debug board, for a "Disco LED" effect.
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*
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* This driver exports either the original ARM LED API, the new generic
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* one, or both.
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*/
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static spinlock_t lock;
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static struct h2p2_dbg_fpga __iomem *fpga;
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static u16 led_state, hw_led_state;
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#ifdef CONFIG_LEDS_OMAP_DEBUG
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#define new_led_api() 1
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#else
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#define new_led_api() 0
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#endif
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/*-------------------------------------------------------------------------*/
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/* original ARM debug LED API:
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* - timer and idle leds (some boards use non-FPGA leds here);
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* - up to 4 generic leds, easily accessed in-kernel (any context)
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*/
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#define GPIO_LED_RED 3
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#define GPIO_LED_GREEN OMAP_MPUIO(4)
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#define LED_STATE_ENABLED 0x01
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#define LED_STATE_CLAIMED 0x02
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#define LED_TIMER_ON 0x04
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#define GPIO_IDLE GPIO_LED_GREEN
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#define GPIO_TIMER GPIO_LED_RED
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static void h2p2_dbg_leds_event(led_event_t evt)
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{
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unsigned long flags;
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spin_lock_irqsave(&lock, flags);
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if (!(led_state & LED_STATE_ENABLED) && evt != led_start)
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goto done;
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switch (evt) {
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case led_start:
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if (fpga)
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led_state |= LED_STATE_ENABLED;
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break;
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case led_stop:
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case led_halted:
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/* all leds off during suspend or shutdown */
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if (!(machine_is_omap_perseus2() || machine_is_omap_h4())) {
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omap_set_gpio_dataout(GPIO_TIMER, 0);
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omap_set_gpio_dataout(GPIO_IDLE, 0);
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}
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__raw_writew(~0, &fpga->leds);
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led_state &= ~LED_STATE_ENABLED;
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goto done;
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case led_claim:
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led_state |= LED_STATE_CLAIMED;
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hw_led_state = 0;
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break;
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case led_release:
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led_state &= ~LED_STATE_CLAIMED;
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break;
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#ifdef CONFIG_LEDS_TIMER
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case led_timer:
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led_state ^= LED_TIMER_ON;
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if (machine_is_omap_perseus2() || machine_is_omap_h4())
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hw_led_state ^= H2P2_DBG_FPGA_P2_LED_TIMER;
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else {
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omap_set_gpio_dataout(GPIO_TIMER,
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led_state & LED_TIMER_ON);
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goto done;
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}
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break;
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#endif
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#ifdef CONFIG_LEDS_CPU
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/* LED lit iff busy */
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case led_idle_start:
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if (machine_is_omap_perseus2() || machine_is_omap_h4())
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hw_led_state &= ~H2P2_DBG_FPGA_P2_LED_IDLE;
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else {
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omap_set_gpio_dataout(GPIO_IDLE, 1);
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goto done;
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}
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break;
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case led_idle_end:
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if (machine_is_omap_perseus2() || machine_is_omap_h4())
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hw_led_state |= H2P2_DBG_FPGA_P2_LED_IDLE;
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else {
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omap_set_gpio_dataout(GPIO_IDLE, 0);
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goto done;
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}
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break;
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#endif
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case led_green_on:
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hw_led_state |= H2P2_DBG_FPGA_LED_GREEN;
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break;
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case led_green_off:
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hw_led_state &= ~H2P2_DBG_FPGA_LED_GREEN;
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break;
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case led_amber_on:
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hw_led_state |= H2P2_DBG_FPGA_LED_AMBER;
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break;
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case led_amber_off:
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hw_led_state &= ~H2P2_DBG_FPGA_LED_AMBER;
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break;
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case led_red_on:
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hw_led_state |= H2P2_DBG_FPGA_LED_RED;
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break;
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case led_red_off:
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hw_led_state &= ~H2P2_DBG_FPGA_LED_RED;
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break;
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case led_blue_on:
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hw_led_state |= H2P2_DBG_FPGA_LED_BLUE;
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break;
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case led_blue_off:
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hw_led_state &= ~H2P2_DBG_FPGA_LED_BLUE;
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break;
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default:
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break;
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}
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/*
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* Actually burn the LEDs
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*/
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if (led_state & LED_STATE_ENABLED)
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__raw_writew(~hw_led_state, &fpga->leds);
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done:
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spin_unlock_irqrestore(&lock, flags);
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}
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/*-------------------------------------------------------------------------*/
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/* "new" LED API
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* - with syfs access and generic triggering
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* - not readily accessible to in-kernel drivers
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*/
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struct dbg_led {
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struct led_classdev cdev;
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u16 mask;
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};
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static struct dbg_led dbg_leds[] = {
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/* REVISIT at least H2 uses different timer & cpu leds... */
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#ifndef CONFIG_LEDS_TIMER
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{ .mask = 1 << 0, .cdev.name = "d4:green",
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.cdev.default_trigger = "heartbeat", },
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#endif
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#ifndef CONFIG_LEDS_CPU
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{ .mask = 1 << 1, .cdev.name = "d5:green", }, /* !idle */
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#endif
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{ .mask = 1 << 2, .cdev.name = "d6:green", },
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{ .mask = 1 << 3, .cdev.name = "d7:green", },
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{ .mask = 1 << 4, .cdev.name = "d8:green", },
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{ .mask = 1 << 5, .cdev.name = "d9:green", },
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{ .mask = 1 << 6, .cdev.name = "d10:green", },
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{ .mask = 1 << 7, .cdev.name = "d11:green", },
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{ .mask = 1 << 8, .cdev.name = "d12:green", },
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{ .mask = 1 << 9, .cdev.name = "d13:green", },
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{ .mask = 1 << 10, .cdev.name = "d14:green", },
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{ .mask = 1 << 11, .cdev.name = "d15:green", },
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#ifndef CONFIG_LEDS
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{ .mask = 1 << 12, .cdev.name = "d16:green", },
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{ .mask = 1 << 13, .cdev.name = "d17:green", },
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{ .mask = 1 << 14, .cdev.name = "d18:green", },
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{ .mask = 1 << 15, .cdev.name = "d19:green", },
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#endif
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};
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static void
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fpga_led_set(struct led_classdev *cdev, enum led_brightness value)
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{
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struct dbg_led *led = container_of(cdev, struct dbg_led, cdev);
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unsigned long flags;
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spin_lock_irqsave(&lock, flags);
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if (value == LED_OFF)
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hw_led_state &= ~led->mask;
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else
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hw_led_state |= led->mask;
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__raw_writew(~hw_led_state, &fpga->leds);
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spin_unlock_irqrestore(&lock, flags);
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}
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static void __init newled_init(struct device *dev)
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{
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unsigned i;
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struct dbg_led *led;
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int status;
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for (i = 0, led = dbg_leds; i < ARRAY_SIZE(dbg_leds); i++, led++) {
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led->cdev.brightness_set = fpga_led_set;
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status = led_classdev_register(dev, &led->cdev);
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if (status < 0)
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break;
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}
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return;
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}
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/*-------------------------------------------------------------------------*/
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static int /* __init */ fpga_probe(struct platform_device *pdev)
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{
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struct resource *iomem;
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spin_lock_init(&lock);
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iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!iomem)
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return -ENODEV;
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fpga = ioremap(iomem->start, H2P2_DBG_FPGA_SIZE);
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__raw_writew(~0, &fpga->leds);
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#ifdef CONFIG_LEDS
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leds_event = h2p2_dbg_leds_event;
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leds_event(led_start);
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#endif
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if (new_led_api()) {
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newled_init(&pdev->dev);
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}
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return 0;
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}
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static int fpga_suspend_late(struct platform_device *pdev, pm_message_t mesg)
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{
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__raw_writew(~0, &fpga->leds);
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return 0;
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}
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static int fpga_resume_early(struct platform_device *pdev)
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{
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__raw_writew(~hw_led_state, &fpga->leds);
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return 0;
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}
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static struct platform_driver led_driver = {
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.driver.name = "omap_dbg_led",
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.probe = fpga_probe,
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.suspend_late = fpga_suspend_late,
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.resume_early = fpga_resume_early,
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};
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static int __init fpga_init(void)
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{
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if (machine_is_omap_h4()
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|| machine_is_omap_h3()
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|| machine_is_omap_h2()
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|| machine_is_omap_perseus2()
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)
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return platform_driver_register(&led_driver);
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return 0;
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}
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fs_initcall(fpga_init);
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