[PATCH 08/18] ARM: mach-integrator: retire custom LED code
Bryan Wu
bryan.wu at canonical.com
Tue Apr 17 06:53:35 EDT 2012
Use the LED in core module for CPU activity and also enable 4
debugging LEDs in baseboard.
The CPU activity LED is now handled by the trigger in the leds
subsystem, retire this old CONFIG_LEDS-based code.
Signed-off-by: Bryan Wu <bryan.wu at canonical.com>
---
arch/arm/mach-integrator/Makefile | 3 +-
arch/arm/mach-integrator/core.c | 1 -
arch/arm/mach-integrator/leds.c | 158 ++++++++++++++++++++++---------------
3 files changed, 96 insertions(+), 66 deletions(-)
diff --git a/arch/arm/mach-integrator/Makefile b/arch/arm/mach-integrator/Makefile
index ebeef96..5521d18 100644
--- a/arch/arm/mach-integrator/Makefile
+++ b/arch/arm/mach-integrator/Makefile
@@ -4,11 +4,10 @@
# Object file lists.
-obj-y := core.o lm.o
+obj-y := core.o lm.o leds.o
obj-$(CONFIG_ARCH_INTEGRATOR_AP) += integrator_ap.o
obj-$(CONFIG_ARCH_INTEGRATOR_CP) += integrator_cp.o
-obj-$(CONFIG_LEDS) += leds.o
obj-$(CONFIG_PCI) += pci_v3.o pci.o
obj-$(CONFIG_CPU_FREQ_INTEGRATOR) += cpu.o
obj-$(CONFIG_INTEGRATOR_IMPD1) += impd1.o
diff --git a/arch/arm/mach-integrator/core.c b/arch/arm/mach-integrator/core.c
index 8c53562..0c7c4ef 100644
--- a/arch/arm/mach-integrator/core.c
+++ b/arch/arm/mach-integrator/core.c
@@ -28,7 +28,6 @@
#include <mach/cm.h>
#include <mach/irqs.h>
-#include <asm/leds.h>
#include <asm/mach-types.h>
#include <asm/mach/time.h>
#include <asm/pgtable.h>
diff --git a/arch/arm/mach-integrator/leds.c b/arch/arm/mach-integrator/leds.c
index 466defa..dab912b 100644
--- a/arch/arm/mach-integrator/leds.c
+++ b/arch/arm/mach-integrator/leds.c
@@ -1,90 +1,122 @@
/*
- * 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 at 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;
+#define ALPHA_REG __io_address(INTEGRATOR_DBG_BASE)
+#define LEDREG (__io_address(INTEGRATOR_DBG_BASE) + INTEGRATOR_DBG_LEDS_OFFSET)
+
+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_leds_event(led_event_t ledevt)
+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);
--
1.7.9.5
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