linux-kernel - [PATCH 04/26] ARM: OMAP: dmtimer: Add function to check if timer is running

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Date:	Thu, 24 Apr 2014 16:43:47 -0500
From:	Joel Fernandes <joelf@...com>
To:	Linux OMAP List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
CC:	Tony Lindgren <tony@...mide.com>, Joel Fernandes <joelf@...com>
Subject: [PATCH 04/26] ARM: OMAP: dmtimer: Add function to check if timer is running

Inorder to move non-DM timer specific code that modifies the "idlect"
mask on OMAP1, from dmtimer code, to OMAP1 specific timer initialization code,
we introduce a new function that can possibly be reused for other purposes in
the future. The function just checks if a timer is running based on the timer ID
which should be same as pdev->id. This allows us to cleanly separate the timer vs
non-timer bits and keep the timer bits in the dmtimer code.

Signed-off-by: Joel Fernandes <joelf@...com>
---
 arch/arm/plat-omap/dmtimer.c              |   29 +++++++++++++++++++++++++++++
 arch/arm/plat-omap/include/plat/dmtimer.h |    2 ++
 2 files changed, 31 insertions(+)

diff --git a/arch/arm/plat-omap/dmtimer.c b/arch/arm/plat-omap/dmtimer.c
index 4debb3d..86b2641 100644
--- a/arch/arm/plat-omap/dmtimer.c
+++ b/arch/arm/plat-omap/dmtimer.c
@@ -187,6 +187,35 @@ int omap_dm_timer_reserve_systimer(int id)
 	return 0;
 }
 
+/*
+ * Check if a timer is running based on timer_id, used for OMAP1 currently.
+ */
+int omap_dm_timer_is_running(int timer_id)
+{
+	int i = 1, ret = 0;
+	struct omap_dm_timer *timer = NULL;
+	unsigned long flags;
+
+	spin_lock_irqsave(&dm_timer_lock, flags);
+	list_for_each_entry(timer, &omap_timer_list, node) {
+		if (i == timer_id) {
+			u32 l;
+			l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
+			if (l & OMAP_TIMER_CTRL_ST) {
+				ret = 1;
+				goto done;
+			} else {
+				goto done;
+			}
+		}
+		i++;
+	}
+done:
+	spin_unlock_irqrestore(&dm_timer_lock, flags);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(omap_dm_timer_is_running);
+
 static struct omap_dm_timer *_omap_dm_timer_request(int req_type, void *data)
 {
 	struct omap_dm_timer *timer = NULL, *t;
diff --git a/arch/arm/plat-omap/include/plat/dmtimer.h b/arch/arm/plat-omap/include/plat/dmtimer.h
index 2861b15..41df0a6 100644
--- a/arch/arm/plat-omap/include/plat/dmtimer.h
+++ b/arch/arm/plat-omap/include/plat/dmtimer.h
@@ -135,6 +135,8 @@ void omap_dm_timer_disable(struct omap_dm_timer *timer);
 
 int omap_dm_timer_get_irq(struct omap_dm_timer *timer);
 
+int omap_dm_timer_is_running(int timer_id);
+
 u32 omap_dm_timer_modify_idlect_mask(u32 inputmask);
 struct clk *omap_dm_timer_get_fclk(struct omap_dm_timer *timer);
 
-- 
1.7.9.5

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