leds.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:2k
- /*
- * linux/arch/arm/mach-integrator/leds.c
- *
- * Integrator LED control routines
- *
- * Copyright (C) 1999 ARM Limited
- * Copyright (C) 2000 Deep Blue Solutions Ltd
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
- #include <linux/kernel.h>
- #include <linux/init.h>
- #include <asm/hardware.h>
- #include <asm/io.h>
- #include <asm/leds.h>
- #include <asm/system.h>
- #include <asm/mach-types.h>
- static int saved_leds;
- static void integrator_leds_event(led_event_t ledevt)
- {
- unsigned long flags;
- const unsigned int dbg_base = IO_ADDRESS(INTEGRATOR_DBG_BASE);
- const unsigned int hdr_ctrl = IO_ADDRESS(INTEGRATOR_HDR_BASE) +
- INTEGRATOR_HDR_CTRL_OFFSET;
- unsigned int ctrl;
- unsigned int update_alpha_leds;
-
- // yup, change the LEDs
- local_irq_save(flags);
- update_alpha_leds = 0;
- switch(ledevt) {
- case led_idle_start:
- ctrl = __raw_readl(hdr_ctrl);
- ctrl &= ~INTEGRATOR_HDR_CTRL_LED;
- __raw_writel(ctrl, hdr_ctrl);
- break;
- case led_idle_end:
- ctrl = __raw_readl(hdr_ctrl);
- ctrl |= INTEGRATOR_HDR_CTRL_LED;
- __raw_writel(ctrl, hdr_ctrl);
- break;
- case led_timer:
- saved_leds ^= GREEN_LED;
- update_alpha_leds = 1;
- break;
- case led_red_on:
- saved_leds |= RED_LED;
- update_alpha_leds = 1;
- break;
- case led_red_off:
- saved_leds &= ~RED_LED;
- update_alpha_leds = 1;
- break;
- default:
- break;
- }
- if (update_alpha_leds) {
- while (__raw_readl(dbg_base + INTEGRATOR_DBG_ALPHA_OFFSET) & 1);
- __raw_writel(saved_leds, dbg_base + INTEGRATOR_DBG_LEDS_OFFSET);
- }
- local_irq_restore(flags);
- }
- static int __init leds_init(void)
- {
- if (machine_is_integrator())
- leds_event = integrator_leds_event;
- return 0;
- }
- __initcall(leds_init);