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Commit bcf86687 authored by Mark Brown's avatar Mark Brown
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Merge remote-tracking branch 'regmap/topic/debugfs' into regmap-next

parents d3816c1a 5166b7c0
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Showing with 260 additions and 64 deletions
drivers/base/regmap/internal.h
View file @ bcf86687
......@@ -15,10 +15,18 @@
#include <linux/regmap.h>
#include <linux/fs.h>
#include <linux/list.h>
struct regmap;
struct regcache_ops;
struct regmap_debugfs_off_cache {
struct list_head list;
off_t min;
off_t max;
unsigned int base_reg;
};
struct regmap_format {
size_t buf_size;
size_t reg_bytes;
......@@ -50,6 +58,12 @@ struct regmap {
#ifdef CONFIG_DEBUG_FS
struct dentry *debugfs;
const char *debugfs_name;
unsigned int debugfs_reg_len;
unsigned int debugfs_val_len;
unsigned int debugfs_tot_len;
struct list_head debugfs_off_cache;
#endif
unsigned int max_register;
......@@ -120,6 +134,8 @@ int _regmap_write(struct regmap *map, unsigned int reg,
struct regmap_range_node {
struct rb_node node;
const char *name;
struct regmap *map;
unsigned int range_min;
unsigned int range_max;
......
drivers/base/regmap/regmap-debugfs.c
View file @ bcf86687
......@@ -56,17 +56,74 @@ static const struct file_operations regmap_name_fops = {
.llseek = default_llseek,
};
static ssize_t regmap_map_read_file(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos)
/*
* Work out where the start offset maps into register numbers, bearing
* in mind that we suppress hidden registers.
*/
static unsigned int regmap_debugfs_get_dump_start(struct regmap *map,
unsigned int base,
loff_t from,
loff_t *pos)
{
int reg_len, val_len, tot_len;
size_t buf_pos = 0;
struct regmap_debugfs_off_cache *c = NULL;
loff_t p = 0;
unsigned int i, ret;
/*
* If we don't have a cache build one so we don't have to do a
* linear scan each time.
*/
if (list_empty(&map->debugfs_off_cache)) {
for (i = base; i <= map->max_register; i += map->reg_stride) {
/* Skip unprinted registers, closing off cache entry */
if (!regmap_readable(map, i) ||
regmap_precious(map, i)) {
if (c) {
c->max = p - 1;
list_add_tail(&c->list,
&map->debugfs_off_cache);
c = NULL;
}
continue;
}
/* No cache entry? Start a new one */
if (!c) {
c = kzalloc(sizeof(*c), GFP_KERNEL);
if (!c)
break;
c->min = p;
c->base_reg = i;
}
p += map->debugfs_tot_len;
}
}
/* Find the relevant block */
list_for_each_entry(c, &map->debugfs_off_cache, list) {
if (*pos >= c->min && *pos <= c->max) {
*pos = c->min;
return c->base_reg;
}
ret = c->max;
}
return ret;
}
static ssize_t regmap_read_debugfs(struct regmap *map, unsigned int from,
unsigned int to, char __user *user_buf,
size_t count, loff_t *ppos)
{
size_t buf_pos = 0;
loff_t p = *ppos;
ssize_t ret;
int i;
struct regmap *map = file->private_data;
char *buf;
unsigned int val;
unsigned int val, start_reg;
if (*ppos < 0 || !count)
return -EINVAL;
......@@ -76,11 +133,18 @@ static ssize_t regmap_map_read_file(struct file *file, char __user *user_buf,
return -ENOMEM;
/* Calculate the length of a fixed format */
reg_len = regmap_calc_reg_len(map->max_register, buf, count);
val_len = 2 * map->format.val_bytes;
tot_len = reg_len + val_len + 3; /* : \n */
if (!map->debugfs_tot_len) {
map->debugfs_reg_len = regmap_calc_reg_len(map->max_register,
buf, count);
map->debugfs_val_len = 2 * map->format.val_bytes;
map->debugfs_tot_len = map->debugfs_reg_len +
map->debugfs_val_len + 3; /* : \n */
}
for (i = 0; i <= map->max_register; i += map->reg_stride) {
/* Work out which register we're starting at */
start_reg = regmap_debugfs_get_dump_start(map, from, *ppos, &p);
for (i = start_reg; i <= to; i += map->reg_stride) {
if (!regmap_readable(map, i))
continue;
......@@ -90,26 +154,27 @@ static ssize_t regmap_map_read_file(struct file *file, char __user *user_buf,
/* If we're in the region the user is trying to read */
if (p >= *ppos) {
/* ...but not beyond it */
if (buf_pos >= count - 1 - tot_len)
if (buf_pos + 1 + map->debugfs_tot_len >= count)
break;
/* Format the register */
snprintf(buf + buf_pos, count - buf_pos, "%.*x: ",
reg_len, i);
buf_pos += reg_len + 2;
map->debugfs_reg_len, i - from);
buf_pos += map->debugfs_reg_len + 2;
/* Format the value, write all X if we can't read */
ret = regmap_read(map, i, &val);
if (ret == 0)
snprintf(buf + buf_pos, count - buf_pos,
"%.*x", val_len, val);
"%.*x", map->debugfs_val_len, val);
else
memset(buf + buf_pos, 'X', val_len);
memset(buf + buf_pos, 'X',
map->debugfs_val_len);
buf_pos += 2 * map->format.val_bytes;
buf[buf_pos++] = '\n';
}
p += tot_len;
p += map->debugfs_tot_len;
}
ret = buf_pos;
......@@ -126,6 +191,15 @@ static ssize_t regmap_map_read_file(struct file *file, char __user *user_buf,
return ret;
}
static ssize_t regmap_map_read_file(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos)
{
struct regmap *map = file->private_data;
return regmap_read_debugfs(map, 0, map->max_register, user_buf,
count, ppos);
}
#undef REGMAP_ALLOW_WRITE_DEBUGFS
#ifdef REGMAP_ALLOW_WRITE_DEBUGFS
/*
......@@ -174,6 +248,22 @@ static const struct file_operations regmap_map_fops = {
.llseek = default_llseek,
};
static ssize_t regmap_range_read_file(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos)
{
struct regmap_range_node *range = file->private_data;
struct regmap *map = range->map;
return regmap_read_debugfs(map, range->range_min, range->range_max,
user_buf, count, ppos);
}
static const struct file_operations regmap_range_fops = {
.open = simple_open,
.read = regmap_range_read_file,
.llseek = default_llseek,
};
static ssize_t regmap_access_read_file(struct file *file,
char __user *user_buf, size_t count,
loff_t *ppos)
......@@ -244,6 +334,11 @@ static const struct file_operations regmap_access_fops = {
void regmap_debugfs_init(struct regmap *map, const char *name)
{
struct rb_node *next;
struct regmap_range_node *range_node;
INIT_LIST_HEAD(&map->debugfs_off_cache);
if (name) {
map->debugfs_name = kasprintf(GFP_KERNEL, "%s-%s",
dev_name(map->dev), name);
......@@ -276,11 +371,32 @@ void regmap_debugfs_init(struct regmap *map, const char *name)
debugfs_create_bool("cache_bypass", 0400, map->debugfs,
&map->cache_bypass);
}
next = rb_first(&map->range_tree);
while (next) {
range_node = rb_entry(next, struct regmap_range_node, node);
if (range_node->name)
debugfs_create_file(range_node->name, 0400,
map->debugfs, range_node,
&regmap_range_fops);
next = rb_next(&range_node->node);
}
}
void regmap_debugfs_exit(struct regmap *map)
{
struct regmap_debugfs_off_cache *c;
debugfs_remove_recursive(map->debugfs);
while (!list_empty(&map->debugfs_off_cache)) {
c = list_first_entry(&map->debugfs_off_cache,
struct regmap_debugfs_off_cache,
list);
list_del(&c->list);
kfree(c);
}
kfree(map->debugfs_name);
}
......
drivers/base/regmap/regmap.c
View file @ bcf86687
......@@ -519,20 +519,38 @@ struct regmap *regmap_init(struct device *dev,
}
map->range_tree = RB_ROOT;
for (i = 0; i < config->n_ranges; i++) {
for (i = 0; i < config->num_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)
if (range_cfg->range_max < range_cfg->range_min) {
dev_err(map->dev, "Invalid range %d: %d < %d\n", i,
range_cfg->range_max, range_cfg->range_min);
goto err_range;
}
if (range_cfg->range_max > map->max_register) {
dev_err(map->dev, "Invalid range %d: %d > %d\n", i,
range_cfg->range_max, map->max_register);
goto err_range;
}
if (range_cfg->selector_reg > map->max_register) {
dev_err(map->dev,
"Invalid range %d: selector out of map\n", i);
goto err_range;
}
if (range_cfg->window_len == 0) {
dev_err(map->dev, "Invalid range %d: window_len 0\n",
i);
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++) {
for (j = 0; j < config->num_ranges; j++) {
unsigned sel_reg = config->ranges[j].selector_reg;
unsigned win_min = config->ranges[j].window_start;
unsigned win_max = win_min +
......@@ -540,11 +558,17 @@ struct regmap *regmap_init(struct device *dev,
if (range_cfg->range_min <= sel_reg &&
sel_reg <= range_cfg->range_max) {
dev_err(map->dev,
"Range %d: selector for %d in window\n",
i, j);
goto err_range;
}
if (!(win_max < range_cfg->range_min ||
win_min > range_cfg->range_max)) {
dev_err(map->dev,
"Range %d: window for %d in window\n",
i, j);
goto err_range;
}
}
......@@ -555,6 +579,8 @@ struct regmap *regmap_init(struct device *dev,
goto err_range;
}
new->map = map;
new->name = range_cfg->name;
new->range_min = range_cfg->range_min;
new->range_max = range_cfg->range_max;
new->selector_reg = range_cfg->selector_reg;
......@@ -564,6 +590,7 @@ struct regmap *regmap_init(struct device *dev,
new->window_len = range_cfg->window_len;
if (_regmap_range_add(map, new) == false) {
dev_err(map->dev, "Failed to add range %d\n", i);
kfree(new);
goto err_range;
}
......@@ -579,7 +606,7 @@ struct regmap *regmap_init(struct device *dev,
}
ret = regcache_init(map, config);
if (ret < 0)
if (ret != 0)
goto err_range;
regmap_debugfs_init(map, config->name);
......@@ -738,59 +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;
if (val_num > 1) {
/* Bulk write shouldn't cross range boundary */
if (*reg + val_num - 1 > range->range_max)
return -EINVAL;
win_offset = (*reg - range->range_min) % range->window_len;
win_page = (*reg - range->range_min) / range->window_len;
/* ... or single page boundary */
if (val_num > range->window_len - win_offset)
return -EINVAL;
}
if (val_num > 1) {
/* Bulk write shouldn't cross range boundary */
if (*reg + val_num - 1 > range->range_max)
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;
/* ... or single page boundary */
if (val_num > range->window_len - win_offset)
return -EINVAL;
}
ret = _regmap_update_bits(map, range->selector_reg,
range->selector_mask,
win_page << range->selector_shift,
&page_chg);
/* 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;
map->work_buf = orig_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;
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;
......@@ -825,9 +850,35 @@ 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;
range = _regmap_range_lookup(map, reg);
if (range) {
int val_num = val_len / map->format.val_bytes;
int win_offset = (reg - range->range_min) % range->window_len;
int win_residue = range->window_len - win_offset;
/* If the write goes beyond the end of the window split it */
while (val_num > win_residue) {
dev_dbg(map->dev, "Writing window %d/%zu\n",
win_residue, val_len / map->format.val_bytes);
ret = _regmap_raw_write(map, reg, val, win_residue *
map->format.val_bytes);
if (ret != 0)
return ret;
reg += win_residue;
val_num -= win_residue;
val += win_residue * map->format.val_bytes;
val_len -= win_residue * map->format.val_bytes;
win_offset = (reg - range->range_min) %
range->window_len;
win_residue = range->window_len - win_offset;
}
ret = _regmap_select_page(map, &reg, range, val_num);
if (ret != 0)
return ret;
}
map->format.format_reg(map->work_buf, reg, map->reg_shift);
......@@ -876,6 +927,7 @@ 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);
......@@ -897,9 +949,12 @@ 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, &reg, 1);
if (ret < 0)
return ret;
range = _regmap_range_lookup(map, reg);
if (range) {
ret = _regmap_select_page(map, &reg, range, 1);
if (ret != 0)
return ret;
}
map->format.format_write(map, reg, val);
......@@ -1055,12 +1110,17 @@ 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, &reg, val_len / map->format.val_bytes);
if (ret < 0)
return ret;
range = _regmap_range_lookup(map, reg);
if (range) {
ret = _regmap_select_page(map, &reg, range,
val_len / map->format.val_bytes);
if (ret != 0)
return ret;
}
map->format.format_reg(map->work_buf, reg, map->reg_shift);
......
include/linux/regmap.h
View file @ bcf86687
......@@ -133,7 +133,7 @@ struct regmap_config {
enum regmap_endian val_format_endian;
const struct regmap_range_cfg *ranges;
unsigned int n_ranges;
unsigned int num_ranges;
};
/**
......@@ -142,6 +142,8 @@ struct regmap_config {
* 1. page selector register update;
* 2. access through data window registers.
*
* @name: Descriptive name for diagnostics
*
* @range_min: Address of the lowest register address in virtual range.
* @range_max: Address of the highest register in virtual range.
*
......@@ -153,6 +155,8 @@ struct regmap_config {
* @window_len: Number of registers in data window.
*/
struct regmap_range_cfg {
const char *name;
/* Registers of virtual address range */
unsigned int range_min;
unsigned int range_max;
......
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