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Message-ID: <1397692999-7800-6-git-send-email-joelf@ti.com>
Date: Wed, 16 Apr 2014 19:03:16 -0500
From: Joel Fernandes <joelf@...com>
To: Tony Lindgren <tony@...mide.com>
CC: Rajendra Nayak <rnayak@...com>,
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>,
Joel Fernandes <joelf@...com>
Subject: [PATCH 6/9] ARM: OMAP: dmtimer: Add a write_ctrl function to simplify bit setting
A common pattern in dmtimer code is to read the control reg, set and reset
certain bits, and write it back. We abstract this pattern and introduce a
new function to do so.
Signed-off-by: Joel Fernandes <joelf@...com>
---
arch/arm/plat-omap/dmtimer.c | 63 ++++++++++++++++++++++++------------------
1 file changed, 36 insertions(+), 27 deletions(-)
diff --git a/arch/arm/plat-omap/dmtimer.c b/arch/arm/plat-omap/dmtimer.c
index 0e96ad2..782ff10 100644
--- a/arch/arm/plat-omap/dmtimer.c
+++ b/arch/arm/plat-omap/dmtimer.c
@@ -91,6 +91,18 @@ static void omap_dm_timer_write_reg(struct omap_dm_timer *timer, u32 reg,
__omap_dm_timer_write(timer, reg, value, timer->posted);
}
+static u32 omap_dm_timer_write_ctrl(struct omap_dm_timer *timer, u32 mask,
+ u32 value)
+{
+ u32 l;
+
+ l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
+ l &= mask;
+ l |= value;
+ omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
+ return l;
+}
+
static void omap_timer_restore_context(struct omap_dm_timer *timer)
{
omap_dm_timer_write_reg(timer, OMAP_TIMER_WAKEUP_EN_REG,
@@ -521,23 +533,22 @@ EXPORT_SYMBOL_GPL(omap_dm_timer_set_source);
int omap_dm_timer_set_load(struct omap_dm_timer *timer, int autoreload,
unsigned int load)
{
- u32 l;
+ u32 mask = ~0, val = 0;
if (unlikely(!timer))
return -EINVAL;
omap_dm_timer_enable(timer);
- l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
if (autoreload)
- l |= OMAP_TIMER_CTRL_AR;
+ val |= OMAP_TIMER_CTRL_AR;
else
- l &= ~OMAP_TIMER_CTRL_AR;
- omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
+ mask &= ~OMAP_TIMER_CTRL_AR;
+ val = omap_dm_timer_write_ctrl(timer, mask, val);
omap_dm_timer_write_reg(timer, OMAP_TIMER_LOAD_REG, load);
omap_dm_timer_write_reg(timer, OMAP_TIMER_TRIGGER_REG, 0);
/* Save the context */
- timer->context.tclr = l;
+ timer->context.tclr = val;
timer->context.tldr = load;
omap_dm_timer_disable(timer);
return 0;
@@ -577,22 +588,22 @@ EXPORT_SYMBOL_GPL(omap_dm_timer_set_load_start);
int omap_dm_timer_set_match(struct omap_dm_timer *timer, int enable,
unsigned int match)
{
- u32 l;
+ u32 mask = ~0, val = 0;
if (unlikely(!timer))
return -EINVAL;
omap_dm_timer_enable(timer);
- l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
if (enable)
- l |= OMAP_TIMER_CTRL_CE;
+ val |= OMAP_TIMER_CTRL_CE;
else
- l &= ~OMAP_TIMER_CTRL_CE;
+ mask &= ~OMAP_TIMER_CTRL_CE;
+
omap_dm_timer_write_reg(timer, OMAP_TIMER_MATCH_REG, match);
- omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
+ val = omap_dm_timer_write_ctrl(timer, mask, val);
/* Save the context */
- timer->context.tclr = l;
+ timer->context.tclr = val;
timer->context.tmar = match;
omap_dm_timer_disable(timer);
return 0;
@@ -602,24 +613,23 @@ EXPORT_SYMBOL_GPL(omap_dm_timer_set_match);
int omap_dm_timer_set_pwm(struct omap_dm_timer *timer, int def_on,
int toggle, int trigger)
{
- u32 l;
+ u32 mask = ~0, val = 0;
if (unlikely(!timer))
return -EINVAL;
omap_dm_timer_enable(timer);
- l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
- l &= ~(OMAP_TIMER_CTRL_GPOCFG | OMAP_TIMER_CTRL_SCPWM |
+ mask &= ~(OMAP_TIMER_CTRL_GPOCFG | OMAP_TIMER_CTRL_SCPWM |
OMAP_TIMER_CTRL_PT | (0x03 << 10));
if (def_on)
- l |= OMAP_TIMER_CTRL_SCPWM;
+ val |= OMAP_TIMER_CTRL_SCPWM;
if (toggle)
- l |= OMAP_TIMER_CTRL_PT;
- l |= trigger << 10;
- omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
+ val |= OMAP_TIMER_CTRL_PT;
+ val |= trigger << 10;
+ val = omap_dm_timer_write_ctrl(timer, mask, val);
/* Save the context */
- timer->context.tclr = l;
+ timer->context.tclr = val;
omap_dm_timer_disable(timer);
return 0;
}
@@ -627,22 +637,21 @@ EXPORT_SYMBOL_GPL(omap_dm_timer_set_pwm);
int omap_dm_timer_set_prescaler(struct omap_dm_timer *timer, int prescaler)
{
- u32 l;
+ u32 mask = ~0, val = 0;
if (unlikely(!timer))
return -EINVAL;
omap_dm_timer_enable(timer);
- l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
- l &= ~(OMAP_TIMER_CTRL_PRE | (0x07 << 2));
+ mask &= ~(OMAP_TIMER_CTRL_PRE | (0x07 << 2));
if (prescaler >= 0x00 && prescaler <= 0x07) {
- l |= OMAP_TIMER_CTRL_PRE;
- l |= prescaler << 2;
+ val |= OMAP_TIMER_CTRL_PRE;
+ val |= prescaler << 2;
}
- omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
+ val = omap_dm_timer_write_ctrl(timer, mask, val);
/* Save the context */
- timer->context.tclr = l;
+ timer->context.tclr = val;
omap_dm_timer_disable(timer);
return 0;
}
--
1.7.9.5
--
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