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>
166 lines
3.4 KiB
C
166 lines
3.4 KiB
C
/*
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* arch/arm/mach-shark/leds.c
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* by Alexander Schulz
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*
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* derived from:
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* arch/arm/kernel/leds-footbridge.c
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* Copyright (C) 1998-1999 Russell King
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*
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* DIGITAL Shark LED control routines.
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*
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* The leds use is as follows:
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* - Green front - toggles state every 50 timer interrupts
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* - Amber front - Unused, this is a dual color led (Amber/Green)
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* - Amber back - On if system is not idle
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*
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* Changelog:
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/spinlock.h>
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#include <linux/ioport.h>
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#include <linux/io.h>
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#include <asm/leds.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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#define SEQUOIA_LED_GREEN (1<<6)
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#define SEQUOIA_LED_AMBER (1<<5)
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#define SEQUOIA_LED_BACK (1<<7)
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static char led_state;
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static short hw_led_state;
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static short saved_state;
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static DEFINE_RAW_SPINLOCK(leds_lock);
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short sequoia_read(int addr) {
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outw(addr,0x24);
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return inw(0x26);
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}
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void sequoia_write(short value,short addr) {
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outw(addr,0x24);
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outw(value,0x26);
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}
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static void sequoia_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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hw_led_state = sequoia_read(0x09);
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switch (evt) {
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case led_start:
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hw_led_state |= SEQUOIA_LED_GREEN;
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hw_led_state |= SEQUOIA_LED_AMBER;
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#ifdef CONFIG_LEDS_CPU
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hw_led_state |= SEQUOIA_LED_BACK;
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#else
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hw_led_state &= ~SEQUOIA_LED_BACK;
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#endif
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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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hw_led_state &= ~SEQUOIA_LED_BACK;
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hw_led_state |= SEQUOIA_LED_GREEN;
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hw_led_state |= SEQUOIA_LED_AMBER;
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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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saved_state = hw_led_state;
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hw_led_state &= ~SEQUOIA_LED_BACK;
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hw_led_state |= SEQUOIA_LED_GREEN;
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hw_led_state |= SEQUOIA_LED_AMBER;
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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 = saved_state;
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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 ^= SEQUOIA_LED_GREEN;
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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 &= ~SEQUOIA_LED_BACK;
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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 |= SEQUOIA_LED_BACK;
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break;
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#endif
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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 &= ~SEQUOIA_LED_GREEN;
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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 |= SEQUOIA_LED_GREEN;
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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 &= ~SEQUOIA_LED_AMBER;
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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 |= SEQUOIA_LED_AMBER;
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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 |= SEQUOIA_LED_BACK;
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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 &= ~SEQUOIA_LED_BACK;
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break;
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default:
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break;
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}
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if (led_state & LED_STATE_ENABLED)
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sequoia_write(hw_led_state,0x09);
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raw_spin_unlock_irqrestore(&leds_lock, flags);
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}
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static int __init leds_init(void)
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{
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extern void (*leds_event)(led_event_t);
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short temp;
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leds_event = sequoia_leds_event;
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/* Make LEDs independent of power-state */
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request_region(0x24,4,"sequoia");
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temp = sequoia_read(0x09);
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temp |= 1<<10;
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sequoia_write(temp,0x09);
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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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