Applied "regmap: irq: add support for chips who have separate unmask registers" to the regmap tree

[Mark Brown <broonie@kernel.org>]

The patch

   regmap: irq: add support for chips who have separate unmask registers

has been applied to the regmap tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From 7b7d1968e4c8d8392e8e63906d45d0bcad079037 Mon Sep 17 00:00:00 2001
From: Guo Zeng <Guo.Zeng@csr.com>
Date: Thu, 17 Sep 2015 05:23:20 +0000
Subject: [PATCH] regmap: irq: add support for chips who have separate unmask
 registers

Some chips have separate unmask registers from mask registers for
some consideration of concurrency SMP write performance. And this
patch adds a flag for it.

An user will be CSR SiRFSoC ARM chips.

Signed-off-by: Guo Zeng <Guo.Zeng@csr.com>
Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 drivers/base/regmap/regmap-irq.c | 31 ++++++++++++++++++++++++++++---
 include/linux/regmap.h           |  3 +++
 2 files changed, 31 insertions(+), 3 deletions(-)

diff --git a/drivers/base/regmap/regmap-irq.c b/drivers/base/regmap/regmap-irq.c
index 38d1f72..e65eec2 100644
--- a/drivers/base/regmap/regmap-irq.c
+++ b/drivers/base/regmap/regmap-irq.c
@@ -63,6 +63,7 @@ static void regmap_irq_sync_unlock(struct irq_data *data)
 	struct regmap *map = d->map;
 	int i, ret;
 	u32 reg;
+	u32 unmask_offset;
 
 	if (d->chip->runtime_pm) {
 		ret = pm_runtime_get_sync(map->dev);
@@ -79,12 +80,28 @@ static void regmap_irq_sync_unlock(struct irq_data *data)
 	for (i = 0; i < d->chip->num_regs; i++) {
 		reg = d->chip->mask_base +
 			(i * map->reg_stride * d->irq_reg_stride);
-		if (d->chip->mask_invert)
+		if (d->chip->mask_invert) {
 			ret = regmap_update_bits(d->map, reg,
 					 d->mask_buf_def[i], ~d->mask_buf[i]);
-		else
+		} else if (d->chip->unmask_base) {
+			/* set mask with mask_base register */
+			ret = regmap_update_bits(d->map, reg,
+					d->mask_buf_def[i], ~d->mask_buf[i]);
+			if (ret < 0)
+				dev_err(d->map->dev,
+					"Failed to sync unmasks in %x\n",
+					reg);
+			unmask_offset = d->chip->unmask_base -
+							d->chip->mask_base;
+			/* clear mask with unmask_base register */
+			ret = regmap_update_bits(d->map,
+					reg + unmask_offset,
+					d->mask_buf_def[i],
+					d->mask_buf[i]);
+		} else {
 			ret = regmap_update_bits(d->map, reg,
 					 d->mask_buf_def[i], d->mask_buf[i]);
+		}
 		if (ret != 0)
 			dev_err(d->map->dev, "Failed to sync masks in %x\n",
 				reg);
@@ -339,6 +356,7 @@ int regmap_add_irq_chip(struct regmap *map, int irq, int irq_flags,
 	int i;
 	int ret = -ENOMEM;
 	u32 reg;
+	u32 unmask_offset;
 
 	if (chip->num_regs <= 0)
 		return -EINVAL;
@@ -420,7 +438,14 @@ int regmap_add_irq_chip(struct regmap *map, int irq, int irq_flags,
 		if (chip->mask_invert)
 			ret = regmap_update_bits(map, reg,
 					 d->mask_buf[i], ~d->mask_buf[i]);
-		else
+		else if (d->chip->unmask_base) {
+			unmask_offset = d->chip->unmask_base -
+					d->chip->mask_base;
+			ret = regmap_update_bits(d->map,
+					reg + unmask_offset,
+					d->mask_buf[i],
+					d->mask_buf[i]);
+		} else
 			ret = regmap_update_bits(map, reg,
 					 d->mask_buf[i], d->mask_buf[i]);
 		if (ret != 0) {
diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index 8fc0bfd..f98fe9f 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -800,6 +800,8 @@ struct regmap_irq {
  *
  * @status_base: Base status register address.
  * @mask_base:   Base mask register address.
+ * @unmask_base:  Base unmask register address. for chips who have
+ *                separate mask and unmask registers
  * @ack_base:    Base ack address. If zero then the chip is clear on read.
  *               Using zero value is possible with @use_ack bit.
  * @wake_base:   Base address for wake enables.  If zero unsupported.
@@ -820,6 +822,7 @@ struct regmap_irq_chip {
 
 	unsigned int status_base;
 	unsigned int mask_base;
+	unsigned int unmask_base;
 	unsigned int ack_base;
 	unsigned int wake_base;
 	unsigned int irq_reg_stride;
-- 
2.5.0