From: Thara Gopinath <thara@xxxxxx>
Add dmtimer platform driver functions which include:
(1) platform driver initialization
(2) driver probe function
(3) driver remove function
Signed-off-by: Thara Gopinath <thara@xxxxxx>
Signed-off-by: Tarun Kanti DebBarma <tarun.kanti@xxxxxx>
---
arch/arm/plat-omap/dmtimer.c | 168 ++++++++++++++++++++++++++++++++++++++++++
1 files changed, 168 insertions(+), 0 deletions(-)
diff --git a/arch/arm/plat-omap/dmtimer.c b/arch/arm/plat-omap/dmtimer.c
index 124fd21..3d7bd65 100644
--- a/arch/arm/plat-omap/dmtimer.c
+++ b/arch/arm/plat-omap/dmtimer.c
@@ -43,9 +43,11 @@
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/module.h>
+#include <linux/slab.h>
#include <mach/hardware.h>
#include <plat/dmtimer.h>
#include <mach/irqs.h>
+#include <linux/err.h>
/* register offsets */
#define _OMAP_TIMER_ID_OFFSET 0x00
@@ -745,6 +747,172 @@ int omap_dm_timers_active(void)
}
EXPORT_SYMBOL_GPL(omap_dm_timers_active);
+/**
+ * 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);
+ 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->fclk = clk_get(&pdev->dev, "fck");
+ if (IS_ERR_OR_NULL(timer->fclk)) {
+ dev_dbg(&pdev->dev, "%s:%d: clk_get() FAILED\n",
+ __func__, __LINE__);
+ ret = -EINVAL;
+ goto err_free_mem;
+ }
+ timer->irq = irq->start;
+ timer->pdev = pdev;
+ timer->id = pdev->id;
+ timer->reserved = 0;
+
+ /* 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;
+
+ spin_lock_irqsave(&dm_timer_lock, flags);
+ list_for_each_entry_safe(timer, tmp, &omap_timer_list, node) {
+ if (timer->id == pdev->id) {
+ clk_put(timer->fclk);
+ 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 = "omap-timer",
+ },
+};
+
+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);
+}
+
+early_platform_init("earlytimer", &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");
+
int __init omap_dm_timer_init(void)
{
unsigned long flags;
--
1.6.0.4
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