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path: root/drivers/base/regmap/regcache.c
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Diffstat (limited to 'drivers/base/regmap/regcache.c')
-rw-r--r--drivers/base/regmap/regcache.c196
1 files changed, 178 insertions, 18 deletions
diff --git a/drivers/base/regmap/regcache.c b/drivers/base/regmap/regcache.c
index e69ff3e4742..75923f2396b 100644
--- a/drivers/base/regmap/regcache.c
+++ b/drivers/base/regmap/regcache.c
@@ -45,8 +45,8 @@ static int regcache_hw_init(struct regmap *map)
tmp_buf = kmalloc(map->cache_size_raw, GFP_KERNEL);
if (!tmp_buf)
return -EINVAL;
- ret = regmap_bulk_read(map, 0, tmp_buf,
- map->num_reg_defaults_raw);
+ ret = regmap_raw_read(map, 0, tmp_buf,
+ map->num_reg_defaults_raw);
map->cache_bypass = cache_bypass;
if (ret < 0) {
kfree(tmp_buf);
@@ -58,8 +58,7 @@ static int regcache_hw_init(struct regmap *map)
/* calculate the size of reg_defaults */
for (count = 0, i = 0; i < map->num_reg_defaults_raw; i++) {
- val = regcache_get_val(map->reg_defaults_raw,
- i, map->cache_word_size);
+ val = regcache_get_val(map, map->reg_defaults_raw, i);
if (regmap_volatile(map, i * map->reg_stride))
continue;
count++;
@@ -75,8 +74,7 @@ static int regcache_hw_init(struct regmap *map)
/* fill the reg_defaults */
map->num_reg_defaults = count;
for (i = 0, j = 0; i < map->num_reg_defaults_raw; i++) {
- val = regcache_get_val(map->reg_defaults_raw,
- i, map->cache_word_size);
+ val = regcache_get_val(map, map->reg_defaults_raw, i);
if (regmap_volatile(map, i * map->reg_stride))
continue;
map->reg_defaults[j].reg = i * map->reg_stride;
@@ -123,6 +121,8 @@ int regcache_init(struct regmap *map, const struct regmap_config *config)
map->reg_defaults_raw = config->reg_defaults_raw;
map->cache_word_size = DIV_ROUND_UP(config->val_bits, 8);
map->cache_size_raw = map->cache_word_size * config->num_reg_defaults_raw;
+ map->cache_present = NULL;
+ map->cache_present_nbits = 0;
map->cache = NULL;
map->cache_ops = cache_types[i];
@@ -181,6 +181,7 @@ void regcache_exit(struct regmap *map)
BUG_ON(!map->cache_ops);
+ kfree(map->cache_present);
kfree(map->reg_defaults);
if (map->cache_free)
kfree(map->reg_defaults_raw);
@@ -417,28 +418,68 @@ void regcache_cache_bypass(struct regmap *map, bool enable)
}
EXPORT_SYMBOL_GPL(regcache_cache_bypass);
-bool regcache_set_val(void *base, unsigned int idx,
- unsigned int val, unsigned int word_size)
+int regcache_set_reg_present(struct regmap *map, unsigned int reg)
{
- switch (word_size) {
+ unsigned long *cache_present;
+ unsigned int cache_present_size;
+ unsigned int nregs;
+ int i;
+
+ nregs = reg + 1;
+ cache_present_size = BITS_TO_LONGS(nregs);
+ cache_present_size *= sizeof(long);
+
+ if (!map->cache_present) {
+ cache_present = kmalloc(cache_present_size, GFP_KERNEL);
+ if (!cache_present)
+ return -ENOMEM;
+ bitmap_zero(cache_present, nregs);
+ map->cache_present = cache_present;
+ map->cache_present_nbits = nregs;
+ }
+
+ if (nregs > map->cache_present_nbits) {
+ cache_present = krealloc(map->cache_present,
+ cache_present_size, GFP_KERNEL);
+ if (!cache_present)
+ return -ENOMEM;
+ for (i = 0; i < nregs; i++)
+ if (i >= map->cache_present_nbits)
+ clear_bit(i, cache_present);
+ map->cache_present = cache_present;
+ map->cache_present_nbits = nregs;
+ }
+
+ set_bit(reg, map->cache_present);
+ return 0;
+}
+
+bool regcache_set_val(struct regmap *map, void *base, unsigned int idx,
+ unsigned int val)
+{
+ if (regcache_get_val(map, base, idx) == val)
+ return true;
+
+ /* Use device native format if possible */
+ if (map->format.format_val) {
+ map->format.format_val(base + (map->cache_word_size * idx),
+ val, 0);
+ return false;
+ }
+
+ switch (map->cache_word_size) {
case 1: {
u8 *cache = base;
- if (cache[idx] == val)
- return true;
cache[idx] = val;
break;
}
case 2: {
u16 *cache = base;
- if (cache[idx] == val)
- return true;
cache[idx] = val;
break;
}
case 4: {
u32 *cache = base;
- if (cache[idx] == val)
- return true;
cache[idx] = val;
break;
}
@@ -448,13 +489,18 @@ bool regcache_set_val(void *base, unsigned int idx,
return false;
}
-unsigned int regcache_get_val(const void *base, unsigned int idx,
- unsigned int word_size)
+unsigned int regcache_get_val(struct regmap *map, const void *base,
+ unsigned int idx)
{
if (!base)
return -EINVAL;
- switch (word_size) {
+ /* Use device native format if possible */
+ if (map->format.parse_val)
+ return map->format.parse_val(regcache_get_val_addr(map, base,
+ idx));
+
+ switch (map->cache_word_size) {
case 1: {
const u8 *cache = base;
return cache[idx];
@@ -498,3 +544,117 @@ int regcache_lookup_reg(struct regmap *map, unsigned int reg)
else
return -ENOENT;
}
+
+static int regcache_sync_block_single(struct regmap *map, void *block,
+ unsigned int block_base,
+ unsigned int start, unsigned int end)
+{
+ unsigned int i, regtmp, val;
+ int ret;
+
+ for (i = start; i < end; i++) {
+ regtmp = block_base + (i * map->reg_stride);
+
+ if (!regcache_reg_present(map, regtmp))
+ continue;
+
+ val = regcache_get_val(map, block, i);
+
+ /* Is this the hardware default? If so skip. */
+ ret = regcache_lookup_reg(map, regtmp);
+ if (ret >= 0 && val == map->reg_defaults[ret].def)
+ continue;
+
+ map->cache_bypass = 1;
+
+ ret = _regmap_write(map, regtmp, val);
+
+ map->cache_bypass = 0;
+ if (ret != 0)
+ return ret;
+ dev_dbg(map->dev, "Synced register %#x, value %#x\n",
+ regtmp, val);
+ }
+
+ return 0;
+}
+
+static int regcache_sync_block_raw_flush(struct regmap *map, const void **data,
+ unsigned int base, unsigned int cur)
+{
+ size_t val_bytes = map->format.val_bytes;
+ int ret, count;
+
+ if (*data == NULL)
+ return 0;
+
+ count = cur - base;
+
+ dev_dbg(map->dev, "Writing %zu bytes for %d registers from 0x%x-0x%x\n",
+ count * val_bytes, count, base, cur - 1);
+
+ map->cache_bypass = 1;
+
+ ret = _regmap_raw_write(map, base, *data, count * val_bytes,
+ false);
+
+ map->cache_bypass = 0;
+
+ *data = NULL;
+
+ return ret;
+}
+
+static int regcache_sync_block_raw(struct regmap *map, void *block,
+ unsigned int block_base, unsigned int start,
+ unsigned int end)
+{
+ unsigned int i, val;
+ unsigned int regtmp = 0;
+ unsigned int base = 0;
+ const void *data = NULL;
+ int ret;
+
+ for (i = start; i < end; i++) {
+ regtmp = block_base + (i * map->reg_stride);
+
+ if (!regcache_reg_present(map, regtmp)) {
+ ret = regcache_sync_block_raw_flush(map, &data,
+ base, regtmp);
+ if (ret != 0)
+ return ret;
+ continue;
+ }
+
+ val = regcache_get_val(map, block, i);
+
+ /* Is this the hardware default? If so skip. */
+ ret = regcache_lookup_reg(map, regtmp);
+ if (ret >= 0 && val == map->reg_defaults[ret].def) {
+ ret = regcache_sync_block_raw_flush(map, &data,
+ base, regtmp);
+ if (ret != 0)
+ return ret;
+ continue;
+ }
+
+ if (!data) {
+ data = regcache_get_val_addr(map, block, i);
+ base = regtmp;
+ }
+ }
+
+ return regcache_sync_block_raw_flush(map, &data, base, regtmp);
+}
+
+int regcache_sync_block(struct regmap *map, void *block,
+ unsigned int block_base, unsigned int start,
+ unsigned int end)
+{
+ if (regmap_can_raw_write(map))
+ return regcache_sync_block_raw(map, block, block_base,
+ start, end);
+ else
+ return regcache_sync_block_single(map, block, block_base,
+ start, end);
+}
generated by cgit v1.2.3-70-g09d2 (git 2.51.2) at 2025-11-04 08:50:03 +0000