[PATCH v2 2/5] media: rc: meson-ir: make use of the bitfield macros
Heiner Kallweit
hkallweit1 at gmail.com
Wed Apr 12 12:30:48 PDT 2017
Make use of the bitfield macros thus partially hiding the complexity
of dealing with bitfields.
The patch also includes a minor fix to REG0_RATE_MASK, so far it was
set to bit 0..10, but according to the spec it's bit 0..11.
Signed-off-by: Heiner Kallweit <hkallweit1 at gmail.com>
Reviewed-by: Neil Armstrong <narmstrong at baylibre.com>
---
v2:
- revert change in meson_ir_set_mask
- add R-b
---
drivers/media/rc/meson-ir.c | 26 ++++++++++++--------------
1 file changed, 12 insertions(+), 14 deletions(-)
diff --git a/drivers/media/rc/meson-ir.c b/drivers/media/rc/meson-ir.c
index a4128d7c..3864ebe3 100644
--- a/drivers/media/rc/meson-ir.c
+++ b/drivers/media/rc/meson-ir.c
@@ -19,6 +19,7 @@
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
+#include <linux/bitfield.h>
#include <media/rc-core.h>
@@ -36,27 +37,24 @@
/* only available on Meson 8b and newer */
#define IR_DEC_REG2 0x20
-#define REG0_RATE_MASK (BIT(11) - 1)
+#define REG0_RATE_MASK GENMASK(11, 0)
#define DECODE_MODE_NEC 0x0
#define DECODE_MODE_RAW 0x2
/* Meson 6b uses REG1 to configure the mode */
#define REG1_MODE_MASK GENMASK(8, 7)
-#define REG1_MODE_SHIFT 7
/* Meson 8b / GXBB use REG2 to configure the mode */
#define REG2_MODE_MASK GENMASK(3, 0)
-#define REG2_MODE_SHIFT 0
-#define REG1_TIME_IV_SHIFT 16
-#define REG1_TIME_IV_MASK ((BIT(13) - 1) << REG1_TIME_IV_SHIFT)
+#define REG1_TIME_IV_MASK GENMASK(28, 16)
-#define REG1_IRQSEL_MASK (BIT(2) | BIT(3))
-#define REG1_IRQSEL_NEC_MODE (0 << 2)
-#define REG1_IRQSEL_RISE_FALL (1 << 2)
-#define REG1_IRQSEL_FALL (2 << 2)
-#define REG1_IRQSEL_RISE (3 << 2)
+#define REG1_IRQSEL_MASK GENMASK(3, 2)
+#define REG1_IRQSEL_NEC_MODE 0
+#define REG1_IRQSEL_RISE_FALL 1
+#define REG1_IRQSEL_FALL 2
+#define REG1_IRQSEL_RISE 3
#define REG1_RESET BIT(0)
#define REG1_ENABLE BIT(15)
@@ -91,7 +89,7 @@ static irqreturn_t meson_ir_irq(int irqno, void *dev_id)
spin_lock(&ir->lock);
duration = readl(ir->reg + IR_DEC_REG1);
- duration = (duration & REG1_TIME_IV_MASK) >> REG1_TIME_IV_SHIFT;
+ duration = FIELD_GET(REG1_TIME_IV_MASK, duration);
rawir.duration = US_TO_NS(duration * MESON_TRATE);
rawir.pulse = !!(readl(ir->reg + IR_DEC_STATUS) & STATUS_IR_DEC_IN);
@@ -170,16 +168,16 @@ static int meson_ir_probe(struct platform_device *pdev)
/* Set general operation mode (= raw/software decoding) */
if (of_device_is_compatible(node, "amlogic,meson6-ir"))
meson_ir_set_mask(ir, IR_DEC_REG1, REG1_MODE_MASK,
- DECODE_MODE_RAW << REG1_MODE_SHIFT);
+ FIELD_PREP(REG1_MODE_MASK, DECODE_MODE_RAW));
else
meson_ir_set_mask(ir, IR_DEC_REG2, REG2_MODE_MASK,
- DECODE_MODE_RAW << REG2_MODE_SHIFT);
+ FIELD_PREP(REG2_MODE_MASK, DECODE_MODE_RAW));
/* Set rate */
meson_ir_set_mask(ir, IR_DEC_REG0, REG0_RATE_MASK, MESON_TRATE - 1);
/* IRQ on rising and falling edges */
meson_ir_set_mask(ir, IR_DEC_REG1, REG1_IRQSEL_MASK,
- REG1_IRQSEL_RISE_FALL);
+ FIELD_PREP(REG1_IRQSEL_MASK, REG1_IRQSEL_RISE_FALL));
/* Enable the decoder */
meson_ir_set_mask(ir, IR_DEC_REG1, REG1_ENABLE, REG1_ENABLE);
--
2.12.2
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