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Date: Thu, 4 Oct 2012 18:36:14 +0100
From: Mark Brown <broonie@...nsource.wolfsonmicro.com>
To: linux-kernel@...r.kernel.org
Cc: Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: [PATCH 1/3] regmap: Factor range lookup out of page selection
This will support a subsequent update to allow bulk writes to cross window
boundaries.
Signed-off-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
---
drivers/base/regmap/regmap.c | 91 +++++++++++++++++++++++-------------------
1 file changed, 51 insertions(+), 40 deletions(-)
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 366b629..4bb926c 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -765,59 +765,57 @@ struct regmap *dev_get_regmap(struct device *dev, const char *name)
EXPORT_SYMBOL_GPL(dev_get_regmap);
static int _regmap_select_page(struct regmap *map, unsigned int *reg,
+ struct regmap_range_node *range,
unsigned int val_num)
{
- struct regmap_range_node *range;
void *orig_work_buf;
unsigned int win_offset;
unsigned int win_page;
bool page_chg;
int ret;
- range = _regmap_range_lookup(map, *reg);
- if (range) {
- win_offset = (*reg - range->range_min) % range->window_len;
- win_page = (*reg - range->range_min) / range->window_len;
+ win_offset = (*reg - range->range_min) % range->window_len;
+ win_page = (*reg - range->range_min) / range->window_len;
- if (val_num > 1) {
- /* Bulk write shouldn't cross range boundary */
- if (*reg + val_num - 1 > range->range_max)
- return -EINVAL;
+ if (val_num > 1) {
+ /* Bulk write shouldn't cross range boundary */
+ if (*reg + val_num - 1 > range->range_max)
+ return -EINVAL;
- /* ... or single page boundary */
- if (val_num > range->window_len - win_offset)
- return -EINVAL;
- }
+ /* ... or single page boundary */
+ if (val_num > range->window_len - win_offset)
+ return -EINVAL;
+ }
- /* It is possible to have selector register inside data window.
- In that case, selector register is located on every page and
- it needs no page switching, when accessed alone. */
- if (val_num > 1 ||
- range->window_start + win_offset != range->selector_reg) {
- /* Use separate work_buf during page switching */
- orig_work_buf = map->work_buf;
- map->work_buf = map->selector_work_buf;
+ /* It is possible to have selector register inside data window.
+ In that case, selector register is located on every page and
+ it needs no page switching, when accessed alone. */
+ if (val_num > 1 ||
+ range->window_start + win_offset != range->selector_reg) {
+ /* Use separate work_buf during page switching */
+ orig_work_buf = map->work_buf;
+ map->work_buf = map->selector_work_buf;
- ret = _regmap_update_bits(map, range->selector_reg,
- range->selector_mask,
- win_page << range->selector_shift,
- &page_chg);
+ ret = _regmap_update_bits(map, range->selector_reg,
+ range->selector_mask,
+ win_page << range->selector_shift,
+ &page_chg);
- map->work_buf = orig_work_buf;
+ map->work_buf = orig_work_buf;
- if (ret < 0)
- return ret;
- }
-
- *reg = range->window_start + win_offset;
+ if (ret < 0)
+ return ret;
}
+ *reg = range->window_start + win_offset;
+
return 0;
}
static int _regmap_raw_write(struct regmap *map, unsigned int reg,
const void *val, size_t val_len)
{
+ struct regmap_range_node *range;
u8 *u8 = map->work_buf;
void *buf;
int ret = -ENOTSUPP;
@@ -852,9 +850,13 @@ static int _regmap_raw_write(struct regmap *map, unsigned int reg,
}
}
- ret = _regmap_select_page(map, ®, val_len / map->format.val_bytes);
- if (ret < 0)
- return ret;
+ range = _regmap_range_lookup(map, reg);
+ if (range) {
+ ret = _regmap_select_page(map, ®, range,
+ val_len / map->format.val_bytes);
+ if (ret < 0)
+ return ret;
+ }
map->format.format_reg(map->work_buf, reg, map->reg_shift);
@@ -903,6 +905,7 @@ static int _regmap_raw_write(struct regmap *map, unsigned int reg,
int _regmap_write(struct regmap *map, unsigned int reg,
unsigned int val)
{
+ struct regmap_range_node *range;
int ret;
BUG_ON(!map->format.format_write && !map->format.format_val);
@@ -924,9 +927,12 @@ int _regmap_write(struct regmap *map, unsigned int reg,
trace_regmap_reg_write(map->dev, reg, val);
if (map->format.format_write) {
- ret = _regmap_select_page(map, ®, 1);
- if (ret < 0)
- return ret;
+ range = _regmap_range_lookup(map, reg);
+ if (range) {
+ ret = _regmap_select_page(map, ®, range, 1);
+ if (ret < 0)
+ return ret;
+ }
map->format.format_write(map, reg, val);
@@ -1082,12 +1088,17 @@ EXPORT_SYMBOL_GPL(regmap_bulk_write);
static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
unsigned int val_len)
{
+ struct regmap_range_node *range;
u8 *u8 = map->work_buf;
int ret;
- ret = _regmap_select_page(map, ®, val_len / map->format.val_bytes);
- if (ret < 0)
- return ret;
+ range = _regmap_range_lookup(map, reg);
+ if (range) {
+ ret = _regmap_select_page(map, ®, range,
+ val_len / map->format.val_bytes);
+ if (ret < 0)
+ return ret;
+ }
map->format.format_reg(map->work_buf, reg, map->reg_shift);
--
1.7.10.4
--
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