125 lines
2.7 KiB
C
125 lines
2.7 KiB
C
/*
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* Driver for the 4 user LEDs found on the Integrator AP/CP baseboard
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* Based on Versatile and RealView machine LED code
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*
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* License terms: GNU General Public License (GPL) version 2
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* Author: Bryan Wu <bryan.wu@canonical.com>
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/leds.h>
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#include "hardware.h"
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#include "cm.h"
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#if defined(CONFIG_NEW_LEDS) && defined(CONFIG_LEDS_CLASS)
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#define ALPHA_REG __io_address(INTEGRATOR_DBG_BASE)
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#define LEDREG (__io_address(INTEGRATOR_DBG_BASE) + INTEGRATOR_DBG_LEDS_OFFSET)
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struct integrator_led {
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struct led_classdev cdev;
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u8 mask;
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};
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/*
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* The triggers lines up below will only be used if the
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* LED triggers are compiled in.
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*/
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static const struct {
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const char *name;
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const char *trigger;
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} integrator_leds[] = {
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{ "integrator:green0", "heartbeat", },
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{ "integrator:yellow", },
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{ "integrator:red", },
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{ "integrator:green1", },
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{ "integrator:core_module", "cpu0", },
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};
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static void integrator_led_set(struct led_classdev *cdev,
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enum led_brightness b)
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{
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struct integrator_led *led = container_of(cdev,
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struct integrator_led, cdev);
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u32 reg = __raw_readl(LEDREG);
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if (b != LED_OFF)
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reg |= led->mask;
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else
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reg &= ~led->mask;
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while (__raw_readl(ALPHA_REG) & 1)
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cpu_relax();
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__raw_writel(reg, LEDREG);
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}
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static enum led_brightness integrator_led_get(struct led_classdev *cdev)
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{
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struct integrator_led *led = container_of(cdev,
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struct integrator_led, cdev);
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u32 reg = __raw_readl(LEDREG);
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return (reg & led->mask) ? LED_FULL : LED_OFF;
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}
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static void cm_led_set(struct led_classdev *cdev,
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enum led_brightness b)
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{
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if (b != LED_OFF)
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cm_control(CM_CTRL_LED, CM_CTRL_LED);
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else
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cm_control(CM_CTRL_LED, 0);
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}
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static enum led_brightness cm_led_get(struct led_classdev *cdev)
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{
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u32 reg = cm_get();
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return (reg & CM_CTRL_LED) ? LED_FULL : LED_OFF;
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}
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static int __init integrator_leds_init(void)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(integrator_leds); i++) {
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struct integrator_led *led;
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led = kzalloc(sizeof(*led), GFP_KERNEL);
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if (!led)
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break;
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led->cdev.name = integrator_leds[i].name;
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if (i == 4) { /* Setting for LED in core module */
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led->cdev.brightness_set = cm_led_set;
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led->cdev.brightness_get = cm_led_get;
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} else {
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led->cdev.brightness_set = integrator_led_set;
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led->cdev.brightness_get = integrator_led_get;
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}
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led->cdev.default_trigger = integrator_leds[i].trigger;
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led->mask = BIT(i);
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if (led_classdev_register(NULL, &led->cdev) < 0) {
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kfree(led);
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break;
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}
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}
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return 0;
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}
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/*
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* Since we may have triggers on any subsystem, defer registration
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* until after subsystem_init.
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*/
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fs_initcall(integrator_leds_init);
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#endif
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