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-rw-r--r--drivers/base/regmap/internal.h17
-rw-r--r--drivers/base/regmap/regmap.c201
2 files changed, 213 insertions, 5 deletions
diff --git a/drivers/base/regmap/internal.h b/drivers/base/regmap/internal.h
index b986b86..80f9ab9 100644
--- a/drivers/base/regmap/internal.h
+++ b/drivers/base/regmap/internal.h
@@ -95,6 +95,9 @@ struct regmap {
/* if set, converts bulk rw to single rw */
bool use_single_rw;
+
+ struct rb_root range_tree;
+ void *selector_work_buf; /* Scratch buffer used for selector */
};
struct regcache_ops {
@@ -115,6 +118,20 @@ bool regmap_precious(struct regmap *map, unsigned int reg);
int _regmap_write(struct regmap *map, unsigned int reg,
unsigned int val);
+struct regmap_range_node {
+ struct rb_node node;
+
+ unsigned int range_min;
+ unsigned int range_max;
+
+ unsigned int selector_reg;
+ unsigned int selector_mask;
+ int selector_shift;
+
+ unsigned int window_start;
+ unsigned int window_len;
+};
+
#ifdef CONFIG_DEBUG_FS
extern void regmap_debugfs_initcall(void);
extern void regmap_debugfs_init(struct regmap *map, const char *name);
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 6520179..83a0166 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -15,12 +15,17 @@
#include <linux/export.h>
#include <linux/mutex.h>
#include <linux/err.h>
+#include <linux/rbtree.h>
#define CREATE_TRACE_POINTS
#include <trace/events/regmap.h>
#include "internal.h"
+static int _regmap_update_bits(struct regmap *map, unsigned int reg,
+ unsigned int mask, unsigned int val,
+ bool *change);
+
bool regmap_writeable(struct regmap *map, unsigned int reg)
{
if (map->max_register && reg > map->max_register)
@@ -208,6 +213,67 @@ static void dev_get_regmap_release(struct device *dev, void *res)
*/
}
+static bool _regmap_range_add(struct regmap *map,
+ struct regmap_range_node *data)
+{
+ struct rb_root *root = &map->range_tree;
+ struct rb_node **new = &(root->rb_node), *parent = NULL;
+
+ while (*new) {
+ struct regmap_range_node *this =
+ container_of(*new, struct regmap_range_node, node);
+
+ parent = *new;
+ if (data->range_max < this->range_min)
+ new = &((*new)->rb_left);
+ else if (data->range_min > this->range_max)
+ new = &((*new)->rb_right);
+ else
+ return false;
+ }
+
+ rb_link_node(&data->node, parent, new);
+ rb_insert_color(&data->node, root);
+
+ return true;
+}
+
+static struct regmap_range_node *_regmap_range_lookup(struct regmap *map,
+ unsigned int reg)
+{
+ struct rb_node *node = map->range_tree.rb_node;
+
+ while (node) {
+ struct regmap_range_node *this =
+ container_of(node, struct regmap_range_node, node);
+
+ if (reg < this->range_min)
+ node = node->rb_left;
+ else if (reg > this->range_max)
+ node = node->rb_right;
+ else
+ return this;
+ }
+
+ return NULL;
+}
+
+static void regmap_range_exit(struct regmap *map)
+{
+ struct rb_node *next;
+ struct regmap_range_node *range_node;
+
+ next = rb_first(&map->range_tree);
+ while (next) {
+ range_node = rb_entry(next, struct regmap_range_node, node);
+ next = rb_next(&range_node->node);
+ rb_erase(&range_node->node, &map->range_tree);
+ kfree(range_node);
+ }
+
+ kfree(map->selector_work_buf);
+}
+
/**
* regmap_init(): Initialise register map
*
@@ -227,6 +293,7 @@ struct regmap *regmap_init(struct device *dev,
{
struct regmap *map, **m;
int ret = -EINVAL;
+ int i, j;
if (!bus || !config)
goto err;
@@ -364,27 +431,88 @@ struct regmap *regmap_init(struct device *dev,
goto err_map;
}
- regmap_debugfs_init(map, config->name);
+ map->range_tree = RB_ROOT;
+ for (i = 0; i < config->n_ranges; i++) {
+ const struct regmap_range_cfg *range_cfg = &config->ranges[i];
+ struct regmap_range_node *new;
+
+ /* Sanity check */
+ if (range_cfg->range_max < range_cfg->range_min ||
+ range_cfg->range_max > map->max_register ||
+ range_cfg->selector_reg > map->max_register ||
+ range_cfg->window_len == 0)
+ goto err_range;
+
+ /* Make sure, that this register range has no selector
+ or data window within its boundary */
+ for (j = 0; j < config->n_ranges; j++) {
+ unsigned sel_reg = config->ranges[j].selector_reg;
+ unsigned win_min = config->ranges[j].window_start;
+ unsigned win_max = win_min +
+ config->ranges[j].window_len - 1;
+
+ if (range_cfg->range_min <= sel_reg &&
+ sel_reg <= range_cfg->range_max) {
+ goto err_range;
+ }
+
+ if (!(win_max < range_cfg->range_min ||
+ win_min > range_cfg->range_max)) {
+ goto err_range;
+ }
+ }
+
+ new = kzalloc(sizeof(*new), GFP_KERNEL);
+ if (new == NULL) {
+ ret = -ENOMEM;
+ goto err_range;
+ }
+
+ new->range_min = range_cfg->range_min;
+ new->range_max = range_cfg->range_max;
+ new->selector_reg = range_cfg->selector_reg;
+ new->selector_mask = range_cfg->selector_mask;
+ new->selector_shift = range_cfg->selector_shift;
+ new->window_start = range_cfg->window_start;
+ new->window_len = range_cfg->window_len;
+
+ if (_regmap_range_add(map, new) == false) {
+ kfree(new);
+ goto err_range;
+ }
+
+ if (map->selector_work_buf == NULL) {
+ map->selector_work_buf =
+ kzalloc(map->format.buf_size, GFP_KERNEL);
+ if (map->selector_work_buf == NULL) {
+ ret = -ENOMEM;
+ goto err_range;
+ }
+ }
+ }
ret = regcache_init(map, config);
if (ret < 0)
- goto err_debugfs;
+ goto err_range;
+
+ regmap_debugfs_init(map, config->name);
/* Add a devres resource for dev_get_regmap() */
m = devres_alloc(dev_get_regmap_release, sizeof(*m), GFP_KERNEL);
if (!m) {
ret = -ENOMEM;
- goto err_cache;
+ goto err_debugfs;
}
*m = map;
devres_add(dev, m);
return map;
-err_cache:
- regcache_exit(map);
err_debugfs:
regmap_debugfs_exit(map);
+ regcache_exit(map);
+err_range:
+ regmap_range_exit(map);
kfree(map->work_buf);
err_map:
kfree(map);
@@ -481,6 +609,7 @@ void regmap_exit(struct regmap *map)
{
regcache_exit(map);
regmap_debugfs_exit(map);
+ regmap_range_exit(map);
if (map->bus->free_context)
map->bus->free_context(map->bus_context);
kfree(map->work_buf);
@@ -526,6 +655,56 @@ 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,
+ 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;
+
+ 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;
+ }
+
+ /* 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);
+ if (ret < 0)
+ return ret;
+
+ map->work_buf = orig_work_buf;
+ }
+
+ *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)
{
@@ -563,6 +742,10 @@ static int _regmap_raw_write(struct regmap *map, unsigned int reg,
}
}
+ ret = _regmap_select_page(map, &reg, val_len / map->format.val_bytes);
+ if (ret < 0)
+ return ret;
+
map->format.format_reg(map->work_buf, reg, map->reg_shift);
u8[0] |= map->write_flag_mask;
@@ -626,6 +809,10 @@ 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, &reg, 1);
+ if (ret < 0)
+ return ret;
+
map->format.format_write(map, reg, val);
trace_regmap_hw_write_start(map->dev, reg, 1);
@@ -783,6 +970,10 @@ static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
u8 *u8 = map->work_buf;
int ret;
+ ret = _regmap_select_page(map, &reg, val_len / map->format.val_bytes);
+ if (ret < 0)
+ return ret;
+
map->format.format_reg(map->work_buf, reg, map->reg_shift);
/*
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