bd31b85960
Annotate the low level hardware locks which must not be preempted. In mainline this change documents the low level nature of the lock - otherwise there's no functional difference. Lockdep and Sparse checking will work as usual. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Ingo Molnar <mingo@elte.hu>
139 lines
2.8 KiB
C
139 lines
2.8 KiB
C
/*
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* linux/arch/arm/mach-footbridge/netwinder-leds.c
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*
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* Copyright (C) 1998-1999 Russell King
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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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* NetWinder LED control routines.
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*
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* The Netwinder uses the leds as follows:
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* - Green - toggles state every 50 timer interrupts
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* - Red - On if the system is not idle
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*
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* Changelog:
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* 02-05-1999 RMK Various cleanups
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/spinlock.h>
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#include <mach/hardware.h>
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#include <asm/leds.h>
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#include <asm/mach-types.h>
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#include <asm/system.h>
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#define LED_STATE_ENABLED 1
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#define LED_STATE_CLAIMED 2
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static char led_state;
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static char hw_led_state;
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static DEFINE_RAW_SPINLOCK(leds_lock);
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static void netwinder_leds_event(led_event_t evt)
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{
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unsigned long flags;
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raw_spin_lock_irqsave(&leds_lock, flags);
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switch (evt) {
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case led_start:
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led_state |= LED_STATE_ENABLED;
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hw_led_state = GPIO_GREEN_LED;
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break;
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case led_stop:
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led_state &= ~LED_STATE_ENABLED;
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break;
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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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hw_led_state = 0;
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break;
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#ifdef CONFIG_LEDS_TIMER
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case led_timer:
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if (!(led_state & LED_STATE_CLAIMED))
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hw_led_state ^= GPIO_GREEN_LED;
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break;
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#endif
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#ifdef CONFIG_LEDS_CPU
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case led_idle_start:
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if (!(led_state & LED_STATE_CLAIMED))
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hw_led_state &= ~GPIO_RED_LED;
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break;
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case led_idle_end:
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if (!(led_state & LED_STATE_CLAIMED))
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hw_led_state |= GPIO_RED_LED;
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break;
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#endif
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case led_halted:
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if (!(led_state & LED_STATE_CLAIMED))
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hw_led_state |= GPIO_RED_LED;
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break;
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case led_green_on:
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if (led_state & LED_STATE_CLAIMED)
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hw_led_state |= GPIO_GREEN_LED;
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break;
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case led_green_off:
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if (led_state & LED_STATE_CLAIMED)
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hw_led_state &= ~GPIO_GREEN_LED;
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break;
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case led_amber_on:
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if (led_state & LED_STATE_CLAIMED)
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hw_led_state |= GPIO_GREEN_LED | GPIO_RED_LED;
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break;
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case led_amber_off:
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if (led_state & LED_STATE_CLAIMED)
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hw_led_state &= ~(GPIO_GREEN_LED | GPIO_RED_LED);
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break;
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case led_red_on:
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if (led_state & LED_STATE_CLAIMED)
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hw_led_state |= GPIO_RED_LED;
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break;
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case led_red_off:
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if (led_state & LED_STATE_CLAIMED)
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hw_led_state &= ~GPIO_RED_LED;
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break;
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default:
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break;
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}
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raw_spin_unlock_irqrestore(&leds_lock, flags);
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if (led_state & LED_STATE_ENABLED) {
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raw_spin_lock_irqsave(&nw_gpio_lock, flags);
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nw_gpio_modify_op(GPIO_RED_LED | GPIO_GREEN_LED, hw_led_state);
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raw_spin_unlock_irqrestore(&nw_gpio_lock, flags);
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}
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}
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static int __init leds_init(void)
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{
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if (machine_is_netwinder())
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leds_event = netwinder_leds_event;
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leds_event(led_start);
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return 0;
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}
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__initcall(leds_init);
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