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: Tarun Kanti DebBarma <tarun.kanti@xxxxxx>
Signed-off-by: Thara Gopinath <thara@xxxxxx>
Acked-by: Cousson, Benoit <b-cousson@xxxxxx>
---
arch/arm/plat-omap/dmtimer.c | 167 ++++++++++++++++++++++++++++-
arch/arm/plat-omap/include/plat/dmtimer.h | 2 +
2 files changed, 168 insertions(+), 1 deletions(-)
diff --git a/arch/arm/plat-omap/dmtimer.c b/arch/arm/plat-omap/dmtimer.c
index 1bfaf09..bfe6fd3 100644
--- a/arch/arm/plat-omap/dmtimer.c
+++ b/arch/arm/plat-omap/dmtimer.c
@@ -43,6 +43,9 @@
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
#include <mach/hardware.h>
#include <plat/dmtimer.h>
#include <mach/irqs.h>
@@ -257,7 +260,8 @@ static struct omap_dm_timer *dm_timers;
static const char **dm_source_names;
static struct clk **dm_source_clocks;
-static spinlock_t dm_timer_lock;
+static LIST_HEAD(omap_timer_list);
+static DEFINE_SPINLOCK(dm_timer_lock);
/*
* Reads timer registers in posted and non-posted mode. The posted mode bit
@@ -689,6 +693,167 @@ 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;
+
+ 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(timer, &omap_timer_list, node)
+ if (!pdata->is_early_init && timer->id == pdev->id) {
+ timer->pdev = pdev;
+ spin_unlock_irqrestore(&dm_timer_lock, flags);
+ dev_dbg(&pdev->dev, "Regular Probed\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;
+ }
+
+ /*
+ * Following func pointers are required by OMAP1's reset code
+ * in mach-omap1/dmtimer.c to access to low level read/write.
+ */
+ if (pdata->is_omap16xx) {
+ pdata->dm_timer_read_reg = omap_dm_timer_read_reg;
+ pdata->dm_timer_write_reg = omap_dm_timer_write_reg;
+ pdata->is_early_init = 0;
+ }
+
+ timer->id = pdev->id;
+ timer->irq = irq->start;
+ timer->pdev = pdev;
+ 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, "Early Probed\n");
+
+ return 0;
+
+err_free_mem:
+ kfree(timer);
+
+err_release_ioregion:
+ release_mem_region(mem->start, resource_size(mem));
+
+err_free_pdev:
+ kfree(pdata);
+ platform_device_unregister(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.
+ * In 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->pdev->id == pdev->id) {
+ kfree(timer->pdev->dev.platform_data);
+ 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_dm_timer_driver = {
+ .probe = omap_dm_timer_probe,
+ .remove = omap_dm_timer_remove,
+ .driver = {
+ .name = "omap_timer",
+ },
+};
+
+static int __init omap_dm_timer_driver_init(void)
+{
+ return platform_driver_register(&omap_dm_timer_driver);
+}
+
+static void __exit omap_dm_timer_driver_exit(void)
+{
+ platform_driver_unregister(&omap_dm_timer_driver);
+}
+
+early_platform_init("earlytimer", &omap_dm_timer_driver);
+module_init(omap_dm_timer_driver_init);
+module_exit(omap_dm_timer_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)
{
struct omap_dm_timer *timer;
diff --git a/arch/arm/plat-omap/include/plat/dmtimer.h b/arch/arm/plat-omap/include/plat/dmtimer.h
index 4bfbfcc..1a080db 100644
--- a/arch/arm/plat-omap/include/plat/dmtimer.h
+++ b/arch/arm/plat-omap/include/plat/dmtimer.h
@@ -59,6 +59,7 @@
struct omap_dm_timer {
unsigned long phys_base;
+ int id;
int irq;
struct clk *iclk, *fclk;
void __iomem *io_base;
@@ -66,6 +67,7 @@ struct omap_dm_timer {
unsigned enabled:1;
unsigned posted:1;
struct platform_device *pdev;
+ struct list_head node;
};
extern struct omap_dm_timer *gptimer_wakeup;
--
1.6.0.4
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