diff options
Diffstat (limited to 'arch/arm/mach-integrator/leds.c')
| -rw-r--r-- | arch/arm/mach-integrator/leds.c | 161 |
1 files changed, 98 insertions, 63 deletions
diff --git a/arch/arm/mach-integrator/leds.c b/arch/arm/mach-integrator/leds.c index 466defa97842..7a7f6d3273bf 100644 --- a/arch/arm/mach-integrator/leds.c +++ b/arch/arm/mach-integrator/leds.c @@ -1,90 +1,125 @@ /* - * linux/arch/arm/mach-integrator/leds.c + * Driver for the 4 user LEDs found on the Integrator AP/CP baseboard + * Based on Versatile and RealView machine LED code * - * Integrator/AP and Integrator/CP 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 + * License terms: GNU General Public License (GPL) version 2 + * Author: Bryan Wu <bryan.wu@canonical.com> */ #include <linux/kernel.h> #include <linux/init.h> -#include <linux/smp.h> -#include <linux/spinlock.h> #include <linux/io.h> +#include <linux/slab.h> +#include <linux/leds.h> +#include <mach/cm.h> #include <mach/hardware.h> #include <mach/platform.h> -#include <asm/leds.h> -#include <asm/mach-types.h> -#include <mach/cm.h> -static int saved_leds; +#if defined(CONFIG_NEW_LEDS) && defined(CONFIG_LEDS_CLASS) + +#define ALPHA_REG __io_address(INTEGRATOR_DBG_BASE) +#define LEDREG (__io_address(INTEGRATOR_DBG_BASE) + INTEGRATOR_DBG_LEDS_OFFSET) -static void integrator_leds_event(led_event_t ledevt) +struct integrator_led { + struct led_classdev cdev; + u8 mask; +}; + +/* + * The triggers lines up below will only be used if the + * LED triggers are compiled in. + */ +static const struct { + const char *name; + const char *trigger; +} integrator_leds[] = { + { "integrator:green0", "heartbeat", }, + { "integrator:yellow", }, + { "integrator:red", }, + { "integrator:green1", }, + { "integrator:core_module", "cpu0", }, +}; + +static void integrator_led_set(struct led_classdev *cdev, + enum led_brightness b) { - unsigned long flags; - const unsigned int dbg_base = IO_ADDRESS(INTEGRATOR_DBG_BASE); - unsigned int update_alpha_leds; + struct integrator_led *led = container_of(cdev, + struct integrator_led, cdev); + u32 reg = __raw_readl(LEDREG); - // yup, change the LEDs - local_irq_save(flags); - update_alpha_leds = 0; + if (b != LED_OFF) + reg |= led->mask; + else + reg &= ~led->mask; - switch(ledevt) { - case led_idle_start: - cm_control(CM_CTRL_LED, 0); - break; + while (__raw_readl(ALPHA_REG) & 1) + cpu_relax(); - case led_idle_end: - cm_control(CM_CTRL_LED, CM_CTRL_LED); - break; + __raw_writel(reg, LEDREG); +} - case led_timer: - saved_leds ^= GREEN_LED; - update_alpha_leds = 1; - break; +static enum led_brightness integrator_led_get(struct led_classdev *cdev) +{ + struct integrator_led *led = container_of(cdev, + struct integrator_led, cdev); + u32 reg = __raw_readl(LEDREG); - case led_red_on: - saved_leds |= RED_LED; - update_alpha_leds = 1; - break; + return (reg & led->mask) ? LED_FULL : LED_OFF; +} - case led_red_off: - saved_leds &= ~RED_LED; - update_alpha_leds = 1; - break; +static void cm_led_set(struct led_classdev *cdev, + enum led_brightness b) +{ + if (b != LED_OFF) + cm_control(CM_CTRL_LED, CM_CTRL_LED); + else + cm_control(CM_CTRL_LED, 0); +} - default: - break; - } +static enum led_brightness cm_led_get(struct led_classdev *cdev) +{ + u32 reg = readl(CM_CTRL); - 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); + return (reg & CM_CTRL_LED) ? LED_FULL : LED_OFF; } -static int __init leds_init(void) +static int __init integrator_leds_init(void) { - if (machine_is_integrator() || machine_is_cintegrator()) - leds_event = integrator_leds_event; + int i; + + for (i = 0; i < ARRAY_SIZE(integrator_leds); i++) { + struct integrator_led *led; + + led = kzalloc(sizeof(*led), GFP_KERNEL); + if (!led) + break; + + + led->cdev.name = integrator_leds[i].name; + + if (i == 4) { /* Setting for LED in core module */ + led->cdev.brightness_set = cm_led_set; + led->cdev.brightness_get = cm_led_get; + } else { + led->cdev.brightness_set = integrator_led_set; + led->cdev.brightness_get = integrator_led_get; + } + + led->cdev.default_trigger = integrator_leds[i].trigger; + led->mask = BIT(i); + + if (led_classdev_register(NULL, &led->cdev) < 0) { + kfree(led); + break; + } + } return 0; } -core_initcall(leds_init); +/* + * Since we may have triggers on any subsystem, defer registration + * until after subsystem_init. + */ +fs_initcall(integrator_leds_init); +#endif |