e0b50d3c64
Partial fix for CONFIG_LEDS breakage ... at least allow platforms using the debug-leds support (H4 for now) to build with the generic LED support, and default the LED that would be the timer LED to trigger using the "heartbeat" (timer driven, rate depends on load). Right now only H2 and P2 seem to have working LED support; this at least makes H4 less broken. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
314 lines
7 KiB
C
314 lines
7 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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