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>

diff --git a/drivers/base/regmap/regmap-irq.c b/drivers/base/regmap/regmap-irq.c
index 38d1f72d869cf4ceb698067f588f81b96e0102df..e65eec2e7def061b37d7ff9a60442e1bbd2ce939 100644 (file)
--- 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 8fc0bfd8edc4434fc79fda8591323d6be41f0645..f98fe9f5faa24269d3946c0a72ae54e5b666846f 100644 (file)
--- 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;