From: Thara Gopinath <thara@xxxxxx>
This patch adds dmtimer platform driver which include:
(1) platform driver initialization
(2) driver probe function
(3) driver remove function
Signed-off-by: Partha Basak <p-basak2@xxxxxx>
Signed-off-by: Thara Gopinath <thara@xxxxxx>
Signed-off-by: Tarun Kanti DebBarma <tarun.kanti@xxxxxx>
Cc: Cousson, Benoit <b-cousson@xxxxxx>
Cc: Paul Walmsley <paul@xxxxxxxxx>
Cc: Kevin Hilman <khilman@xxxxxxxxxxxxxxxxxxx>
Cc: Tony Lindgren <tony@xxxxxxxxxxx>
---
arch/arm/plat-omap/dmtimer.c | 186 +++++++++++++++++++++++++++++++++++++++++-
1 files changed, 185 insertions(+), 1 deletions(-)
diff --git a/arch/arm/plat-omap/dmtimer.c b/arch/arm/plat-omap/dmtimer.c
index 9a22623..fc3513e 100644
--- a/arch/arm/plat-omap/dmtimer.c
+++ b/arch/arm/plat-omap/dmtimer.c
@@ -43,7 +43,9 @@
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/module.h>
+#include <linux/slab.h>
#include <mach/hardware.h>
+#include <linux/pm_runtime.h>
#include <plat/dmtimer.h>
#include <mach/irqs.h>
@@ -780,13 +782,195 @@ int __init omap_dm_timer_init(void)
timer->fclk = clk_get(NULL, clk_name);
}
+#endif
timer->id = i;
/* add the timer element to the list */
spin_lock_irqsave(&dm_timer_lock, flags);
list_add_tail(&timer->node, &omap_timer_list);
spin_unlock_irqrestore(&dm_timer_lock, flags);
-#endif
}
return 0;
}
+/**
+ * omap_dm_timer_probe - probe function called for every registered device
+ * @pdev: pointer to current timer platform device
+ *
+ * called by driver framework at the end of device registration for all
+ * timer devices
+ */
+static int __devinit omap_dm_timer_probe(struct platform_device *pdev)
+{
+ int ret;
+ unsigned long flags;
+ struct omap_dm_timer *timer;
+ struct resource *mem, *irq, *ioarea;
+ struct dmtimer_platform_data *pdata = pdev->dev.platform_data;
+
+ dev_dbg(&pdev->dev, "%s:+\n", __func__);
+
+ if (!pdata) {
+ dev_err(&pdev->dev, "%s: no platform data\n", __func__);
+ return -ENODEV;
+ }
+ /*
+ * early timers are already registered and in list.
+ * what we need to do during second phase of probe
+ * is to assign the newly allocated/configured pdev
+ * to already registered timer->pdev. we also call
+ * pm_runtime_enable() for each device because it
+ * could not be called during early boot because
+ * pm_runtime framework was not yet up and running.
+ */
+ spin_lock_irqsave(&dm_timer_lock, flags);
+ list_for_each_entry(timer, &omap_timer_list, node)
+ if (timer->id == pdev->id) {
+ timer->pdev = pdev;
+ spin_unlock_irqrestore(&dm_timer_lock, flags);
+ pm_runtime_enable(&pdev->dev);
+ if (timer->enabled) {
+ /*
+ * Disable the clock and reenable via runtime
+ * framework so that reference count at
+ * at PM Runtime, OMAP device & clock fw are
+ * consistent.
+ */
+ omap_dm_timer_disable(timer);
+ pm_runtime_get_sync(&pdev->dev);
+ }
+ dev_dbg(&pdev->dev, "pm_runtime ENABLED\n");
+ return 0;
+ }
+ spin_unlock_irqrestore(&dm_timer_lock, flags);
+
+ irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+ if (unlikely(!irq)) {
+ dev_err(&pdev->dev, "%s: no IRQ resource\n", __func__);
+ ret = -ENODEV;
+ goto err_free_pdev;
+ }
+
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (unlikely(!mem)) {
+ dev_err(&pdev->dev, "%s: no memory resource\n", __func__);
+ ret = -ENODEV;
+ goto err_free_pdev;
+ }
+
+ ioarea = request_mem_region(mem->start, resource_size(mem),
+ pdev->name);
+ if (!ioarea) {
+ dev_err(&pdev->dev, "%s: region already claimed\n", __func__);
+ ret = -EBUSY;
+ goto err_free_pdev;
+ }
+
+ timer = kzalloc(sizeof(struct omap_dm_timer), GFP_KERNEL);
+ if (!timer) {
+ dev_err(&pdev->dev, "%s: no memory for omap_dm_timer\n",
+ __func__);
+ ret = -ENOMEM;
+ goto err_release_ioregion;
+ }
+
+ timer->io_base = ioremap(mem->start, resource_size(mem));
+ if (!timer->io_base) {
+ dev_err(&pdev->dev, "%s: ioremap failed\n", __func__);
+ ret = -ENOMEM;
+ goto err_free_mem;
+ }
+
+ timer->irq = irq->start;
+ timer->pdev = pdev;
+ timer->id = pdev->id;
+ timer->reserved = 0;
+ /*
+ * if pm_runtime is not defined hwmod by default enables the clock.
+ * in order to avoid back to back enabling of device clock using
+ * omap_dm_timer_enable(), timer->enabled flag is set here.
+ */
+#ifndef CONFIG_PM_RUNTIME
+ timer->enabled = 1;
+#endif
+
+ /* add the timer element to the list */
+ spin_lock_irqsave(&dm_timer_lock, flags);
+ list_add_tail(&timer->node, &omap_timer_list);
+ spin_unlock_irqrestore(&dm_timer_lock, flags);
+
+ dev_dbg(&pdev->dev, " bound to its driver\n");
+
+ return 0;
+
+err_free_mem:
+ kfree(timer);
+
+err_release_ioregion:
+ release_mem_region(mem->start, resource_size(mem));
+
+err_free_pdev:
+ platform_device_del(pdev);
+
+ return ret;
+}
+
+/**
+ * omap_dm_timer_remove - cleanup a registered timer device
+ * @pdev: pointer to current timer platform device
+ *
+ * called by driver framework whenever a timer device is unregistered.
+ * it addition to freeing platform resources it also deletes the timer
+ * entry from the local list.
+ */
+static int __devexit omap_dm_timer_remove(struct platform_device *pdev)
+{
+ struct omap_dm_timer *timer, *tmp;
+ unsigned long flags;
+ int ret = -EINVAL;
+ struct dmtimer_platform_data *pdata = pdev->dev.platform_data;
+
+ if (!pdata) {
+ dev_err(&pdev->dev, "%s: no platform data\n", __func__);
+ return -ENODEV;
+ }
+
+ spin_lock_irqsave(&dm_timer_lock, flags);
+ list_for_each_entry_safe(timer, tmp, &omap_timer_list, node) {
+ if (timer->id == pdev->id) {
+ platform_device_del(timer->pdev);
+ list_del(&timer->node);
+ kfree(timer);
+ ret = 0;
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&dm_timer_lock, flags);
+
+ return ret;
+}
+
+static struct platform_driver omap_dmtimer_driver = {
+ .probe = omap_dm_timer_probe,
+ .remove = omap_dm_timer_remove,
+ .driver = {
+ .name = "dmtimer",
+ },
+};
+
+static int __init omap_dmtimer_driver_init(void)
+{
+ return platform_driver_register(&omap_dmtimer_driver);
+}
+
+static void __exit omap_dmtimer_driver_exit(void)
+{
+ platform_driver_unregister(&omap_dmtimer_driver);
+}
+
+module_init(omap_dmtimer_driver_init);
+module_exit(omap_dmtimer_driver_exit);
+
+MODULE_DESCRIPTION("OMAP DUAL MODE TIMER DRIVER");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRIVER_NAME);
+MODULE_AUTHOR("Texas Instruments Inc");
--
1.6.0.4
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