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Merge remote-tracking branch 'regmap/topic/async' into regmap-next

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This commit is contained in:
Mark Brown 2013-02-14 17:11:03 +00:00
commit 3689cf7fd1
4 changed files with 354 additions and 47 deletions
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18
drivers/base/regmap/internal.h
View file

@ -16,6 +16,7 @@
#include <linux/regmap.h>
#include <linux/fs.h>
#include <linux/list.h>
#include <linux/wait.h>
struct regmap;
struct regcache_ops;
@ -39,6 +40,13 @@ struct regmap_format {
unsigned int (*parse_val)(void *buf);
};
struct regmap_async {
struct list_head list;
struct work_struct cleanup;
struct regmap *map;
void *work_buf;
};
struct regmap {
struct mutex mutex;
spinlock_t spinlock;
@ -53,6 +61,11 @@ struct regmap {
void *bus_context;
const char *name;
spinlock_t async_lock;
wait_queue_head_t async_waitq;
struct list_head async_list;
int async_ret;
#ifdef CONFIG_DEBUG_FS
struct dentry *debugfs;
const char *debugfs_name;
@ -74,6 +87,9 @@ struct regmap {
const struct regmap_access_table *volatile_table;
const struct regmap_access_table *precious_table;
int (*reg_read)(void *context, unsigned int reg, unsigned int *val);
int (*reg_write)(void *context, unsigned int reg, unsigned int val);
u8 read_flag_mask;
u8 write_flag_mask;
@ -175,6 +191,8 @@ bool regcache_set_val(void *base, unsigned int idx,
unsigned int val, unsigned int word_size);
int regcache_lookup_reg(struct regmap *map, unsigned int reg);
void regmap_async_complete_cb(struct regmap_async *async, int ret);
extern struct regcache_ops regcache_rbtree_ops;
extern struct regcache_ops regcache_lzo_ops;

54
drivers/base/regmap/regmap-spi.c
View file

@ -15,6 +15,21 @@
#include <linux/init.h>
#include <linux/module.h>
#include "internal.h"
struct regmap_async_spi {
struct regmap_async core;
struct spi_message m;
struct spi_transfer t[2];
};
static void regmap_spi_complete(void *data)
{
struct regmap_async_spi *async = data;
regmap_async_complete_cb(&async->core, async->m.status);
}
static int regmap_spi_write(void *context, const void *data, size_t count)
{
struct device *dev = context;
@ -40,6 +55,43 @@ static int regmap_spi_gather_write(void *context,
return spi_sync(spi, &m);
}
static int regmap_spi_async_write(void *context,
const void *reg, size_t reg_len,
const void *val, size_t val_len,
struct regmap_async *a)
{
struct regmap_async_spi *async = container_of(a,
struct regmap_async_spi,
core);
struct device *dev = context;
struct spi_device *spi = to_spi_device(dev);
async->t[0].tx_buf = reg;
async->t[0].len = reg_len;
async->t[1].tx_buf = val;
async->t[1].len = val_len;
spi_message_init(&async->m);
spi_message_add_tail(&async->t[0], &async->m);
spi_message_add_tail(&async->t[1], &async->m);
async->m.complete = regmap_spi_complete;
async->m.context = async;
return spi_async(spi, &async->m);
}
static struct regmap_async *regmap_spi_async_alloc(void)
{
struct regmap_async_spi *async_spi;
async_spi = kzalloc(sizeof(*async_spi), GFP_KERNEL);
if (!async_spi)
return NULL;
return &async_spi->core;
}
static int regmap_spi_read(void *context,
const void *reg, size_t reg_size,
void *val, size_t val_size)
@ -53,6 +105,8 @@ static int regmap_spi_read(void *context,
static struct regmap_bus regmap_spi = {
.write = regmap_spi_write,
.gather_write = regmap_spi_gather_write,
.async_write = regmap_spi_async_write,
.async_alloc = regmap_spi_async_alloc,
.read = regmap_spi_read,
.read_flag_mask = 0x80,
};

301
drivers/base/regmap/regmap.c
View file

@ -16,6 +16,7 @@
#include <linux/mutex.h>
#include <linux/err.h>
#include <linux/rbtree.h>
#include <linux/sched.h>
#define CREATE_TRACE_POINTS
#include <trace/events/regmap.h>
@ -34,6 +35,22 @@ static int _regmap_update_bits(struct regmap *map, unsigned int reg,
unsigned int mask, unsigned int val,
bool *change);
static int _regmap_bus_read(void *context, unsigned int reg,
unsigned int *val);
static int _regmap_bus_formatted_write(void *context, unsigned int reg,
unsigned int val);
static int _regmap_bus_raw_write(void *context, unsigned int reg,
unsigned int val);
static void async_cleanup(struct work_struct *work)
{
struct regmap_async *async = container_of(work, struct regmap_async,
cleanup);
kfree(async->work_buf);
kfree(async);
}
bool regmap_reg_in_ranges(unsigned int reg,
const struct regmap_range *ranges,
unsigned int nranges)
@ -423,6 +440,10 @@ struct regmap *regmap_init(struct device *dev,
map->cache_type = config->cache_type;
map->name = config->name;
spin_lock_init(&map->async_lock);
INIT_LIST_HEAD(&map->async_list);
init_waitqueue_head(&map->async_waitq);
if (config->read_flag_mask || config->write_flag_mask) {
map->read_flag_mask = config->read_flag_mask;
map->write_flag_mask = config->write_flag_mask;
@ -430,6 +451,8 @@ struct regmap *regmap_init(struct device *dev,
map->read_flag_mask = bus->read_flag_mask;
}
map->reg_read = _regmap_bus_read;
reg_endian = config->reg_format_endian;
if (reg_endian == REGMAP_ENDIAN_DEFAULT)
reg_endian = bus->reg_format_endian_default;
@ -581,6 +604,11 @@ struct regmap *regmap_init(struct device *dev,
goto err_map;
}
if (map->format.format_write)
map->reg_write = _regmap_bus_formatted_write;
else if (map->format.format_val)
map->reg_write = _regmap_bus_raw_write;
map->range_tree = RB_ROOT;
for (i = 0; i < config->num_ranges; i++) {
const struct regmap_range_cfg *range_cfg = &config->ranges[i];
@ -876,10 +904,13 @@ static int _regmap_select_page(struct regmap *map, unsigned int *reg,
}
static int _regmap_raw_write(struct regmap *map, unsigned int reg,
const void *val, size_t val_len)
const void *val, size_t val_len, bool async)
{
struct regmap_range_node *range;
unsigned long flags;
u8 *u8 = map->work_buf;
void *work_val = map->work_buf + map->format.reg_bytes +
map->format.pad_bytes;
void *buf;
int ret = -ENOTSUPP;
size_t len;
@ -924,7 +955,7 @@ static int _regmap_raw_write(struct regmap *map, unsigned int reg,
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);
map->format.val_bytes, async);
if (ret != 0)
return ret;
@ -947,6 +978,50 @@ static int _regmap_raw_write(struct regmap *map, unsigned int reg,
u8[0] |= map->write_flag_mask;
if (async && map->bus->async_write) {
struct regmap_async *async = map->bus->async_alloc();
if (!async)
return -ENOMEM;
async->work_buf = kzalloc(map->format.buf_size,
GFP_KERNEL | GFP_DMA);
if (!async->work_buf) {
kfree(async);
return -ENOMEM;
}
INIT_WORK(&async->cleanup, async_cleanup);
async->map = map;
/* If the caller supplied the value we can use it safely. */
memcpy(async->work_buf, map->work_buf, map->format.pad_bytes +
map->format.reg_bytes + map->format.val_bytes);
if (val == work_val)
val = async->work_buf + map->format.pad_bytes +
map->format.reg_bytes;
spin_lock_irqsave(&map->async_lock, flags);
list_add_tail(&async->list, &map->async_list);
spin_unlock_irqrestore(&map->async_lock, flags);
ret = map->bus->async_write(map->bus_context, async->work_buf,
map->format.reg_bytes +
map->format.pad_bytes,
val, val_len, async);
if (ret != 0) {
dev_err(map->dev, "Failed to schedule write: %d\n",
ret);
spin_lock_irqsave(&map->async_lock, flags);
list_del(&async->list);
spin_unlock_irqrestore(&map->async_lock, flags);
kfree(async->work_buf);
kfree(async);
}
}
trace_regmap_hw_write_start(map->dev, reg,
val_len / map->format.val_bytes);
@ -954,8 +1029,7 @@ static int _regmap_raw_write(struct regmap *map, unsigned int reg,
* send the work_buf directly, otherwise try to do a gather
* write.
*/
if (val == (map->work_buf + map->format.pad_bytes +
map->format.reg_bytes))
if (val == work_val)
ret = map->bus->write(map->bus_context, map->work_buf,
map->format.reg_bytes +
map->format.pad_bytes +
@ -987,12 +1061,54 @@ static int _regmap_raw_write(struct regmap *map, unsigned int reg,
return ret;
}
static int _regmap_bus_formatted_write(void *context, unsigned int reg,
unsigned int val)
{
int ret;
struct regmap_range_node *range;
struct regmap *map = context;
BUG_ON(!map->format.format_write);
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);
trace_regmap_hw_write_start(map->dev, reg, 1);
ret = map->bus->write(map->bus_context, map->work_buf,
map->format.buf_size);
trace_regmap_hw_write_done(map->dev, reg, 1);
return ret;
}
static int _regmap_bus_raw_write(void *context, unsigned int reg,
unsigned int val)
{
struct regmap *map = context;
BUG_ON(!map->format.format_val);
map->format.format_val(map->work_buf + map->format.reg_bytes
+ map->format.pad_bytes, val, 0);
return _regmap_raw_write(map, reg,
map->work_buf +
map->format.reg_bytes +
map->format.pad_bytes,
map->format.val_bytes, false);
}
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);
if (!map->cache_bypass && map->format.format_write) {
ret = regcache_write(map, reg, val);
@ -1011,33 +1127,7 @@ int _regmap_write(struct regmap *map, unsigned int reg,
trace_regmap_reg_write(map->dev, reg, val);
if (map->format.format_write) {
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);
trace_regmap_hw_write_start(map->dev, reg, 1);
ret = map->bus->write(map->bus_context, map->work_buf,
map->format.buf_size);
trace_regmap_hw_write_done(map->dev, reg, 1);
return ret;
} else {
map->format.format_val(map->work_buf + map->format.reg_bytes
+ map->format.pad_bytes, val, 0);
return _regmap_raw_write(map, reg,
map->work_buf +
map->format.reg_bytes +
map->format.pad_bytes,
map->format.val_bytes);
}
return map->reg_write(map, reg, val);
}
/**
@ -1095,7 +1185,7 @@ int regmap_raw_write(struct regmap *map, unsigned int reg,
map->lock(map->lock_arg);
ret = _regmap_raw_write(map, reg, val, val_len);
ret = _regmap_raw_write(map, reg, val, val_len, false);
map->unlock(map->lock_arg);
@ -1151,14 +1241,15 @@ int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val,
if (map->use_single_rw) {
for (i = 0; i < val_count; i++) {
ret = regmap_raw_write(map,
reg + (i * map->reg_stride),
val + (i * val_bytes),
val_bytes);
reg + (i * map->reg_stride),
val + (i * val_bytes),
val_bytes);
if (ret != 0)
return ret;
}
} else {
ret = _regmap_raw_write(map, reg, wval, val_bytes * val_count);
ret = _regmap_raw_write(map, reg, wval, val_bytes * val_count,
false);
}
if (val_bytes != 1)
@ -1170,6 +1261,48 @@ int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val,
}
EXPORT_SYMBOL_GPL(regmap_bulk_write);
/**
* regmap_raw_write_async(): Write raw values to one or more registers
* asynchronously
*
* @map: Register map to write to
* @reg: Initial register to write to
* @val: Block of data to be written, laid out for direct transmission to the
* device. Must be valid until regmap_async_complete() is called.
* @val_len: Length of data pointed to by val.
*
* This function is intended to be used for things like firmware
* download where a large block of data needs to be transferred to the
* device. No formatting will be done on the data provided.
*
* If supported by the underlying bus the write will be scheduled
* asynchronously, helping maximise I/O speed on higher speed buses
* like SPI. regmap_async_complete() can be called to ensure that all
* asynchrnous writes have been completed.
*
* A value of zero will be returned on success, a negative errno will
* be returned in error cases.
*/
int regmap_raw_write_async(struct regmap *map, unsigned int reg,
const void *val, size_t val_len)
{
int ret;
if (val_len % map->format.val_bytes)
return -EINVAL;
if (reg % map->reg_stride)
return -EINVAL;
map->lock(map->lock_arg);
ret = _regmap_raw_write(map, reg, val, val_len, true);
map->unlock(map->lock_arg);
return ret;
}
EXPORT_SYMBOL_GPL(regmap_raw_write_async);
static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
unsigned int val_len)
{
@ -1208,10 +1341,27 @@ static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
return ret;
}
static int _regmap_bus_read(void *context, unsigned int reg,
unsigned int *val)
{
int ret;
struct regmap *map = context;
if (!map->format.parse_val)
return -EINVAL;
ret = _regmap_raw_read(map, reg, map->work_buf, map->format.val_bytes);
if (ret == 0)
*val = map->format.parse_val(map->work_buf);
return ret;
}
static int _regmap_read(struct regmap *map, unsigned int reg,
unsigned int *val)
{
int ret;
BUG_ON(!map->reg_read);
if (!map->cache_bypass) {
ret = regcache_read(map, reg, val);
@ -1219,26 +1369,21 @@ static int _regmap_read(struct regmap *map, unsigned int reg,
return 0;
}
if (!map->format.parse_val)
return -EINVAL;
if (map->cache_only)
return -EBUSY;
ret = _regmap_raw_read(map, reg, map->work_buf, map->format.val_bytes);
ret = map->reg_read(map, reg, val);
if (ret == 0) {
*val = map->format.parse_val(map->work_buf);
#ifdef LOG_DEVICE
if (strcmp(dev_name(map->dev), LOG_DEVICE) == 0)
dev_info(map->dev, "%x => %x\n", reg, *val);
#endif
trace_regmap_reg_read(map->dev, reg, *val);
}
if (ret == 0 && !map->cache_bypass)
regcache_write(map, reg, *val);
if (!map->cache_bypass)
regcache_write(map, reg, *val);
}
return ret;
}
@ -1456,6 +1601,68 @@ int regmap_update_bits_check(struct regmap *map, unsigned int reg,
}
EXPORT_SYMBOL_GPL(regmap_update_bits_check);
void regmap_async_complete_cb(struct regmap_async *async, int ret)
{
struct regmap *map = async->map;
bool wake;
spin_lock(&map->async_lock);
list_del(&async->list);
wake = list_empty(&map->async_list);
if (ret != 0)
map->async_ret = ret;
spin_unlock(&map->async_lock);
schedule_work(&async->cleanup);
if (wake)
wake_up(&map->async_waitq);
}
EXPORT_SYMBOL_GPL(regmap_async_complete_cb);
static int regmap_async_is_done(struct regmap *map)
{
unsigned long flags;
int ret;
spin_lock_irqsave(&map->async_lock, flags);
ret = list_empty(&map->async_list);
spin_unlock_irqrestore(&map->async_lock, flags);
return ret;
}
/**
* regmap_async_complete: Ensure all asynchronous I/O has completed.
*
* @map: Map to operate on.
*
* Blocks until any pending asynchronous I/O has completed. Returns
* an error code for any failed I/O operations.
*/
int regmap_async_complete(struct regmap *map)
{
unsigned long flags;
int ret;
/* Nothing to do with no async support */
if (!map->bus->async_write)
return 0;
wait_event(map->async_waitq, regmap_async_is_done(map));
spin_lock_irqsave(&map->async_lock, flags);
ret = map->async_ret;
map->async_ret = 0;
spin_unlock_irqrestore(&map->async_lock, flags);
return ret;
}
EXPORT_SYMBOL_GPL(regmap_async_complete);
/**
* regmap_register_patch: Register and apply register updates to be applied
* on device initialistion

28
include/linux/regmap.h
View file

@ -235,14 +235,21 @@ struct regmap_range_cfg {
unsigned int window_len;
};
struct regmap_async;
typedef int (*regmap_hw_write)(void *context, const void *data,
size_t count);
typedef int (*regmap_hw_gather_write)(void *context,
const void *reg, size_t reg_len,
const void *val, size_t val_len);
typedef int (*regmap_hw_async_write)(void *context,
const void *reg, size_t reg_len,
const void *val, size_t val_len,
struct regmap_async *async);
typedef int (*regmap_hw_read)(void *context,
const void *reg_buf, size_t reg_size,
void *val_buf, size_t val_size);
typedef struct regmap_async *(*regmap_hw_async_alloc)(void);
typedef void (*regmap_hw_free_context)(void *context);
/**
@ -255,8 +262,11 @@ typedef void (*regmap_hw_free_context)(void *context);
* @write: Write operation.
* @gather_write: Write operation with split register/value, return -ENOTSUPP
* if not implemented on a given device.
* @async_write: Write operation which completes asynchronously, optional and
* must serialise with respect to non-async I/O.
* @read: Read operation. Data is returned in the buffer used to transmit
* data.
* @async_alloc: Allocate a regmap_async() structure.
* @read_flag_mask: Mask to be set in the top byte of the register when doing
* a read.
* @reg_format_endian_default: Default endianness for formatted register
@ -265,13 +275,16 @@ typedef void (*regmap_hw_free_context)(void *context);
* @val_format_endian_default: Default endianness for formatted register
* values. Used when the regmap_config specifies DEFAULT. If this is
* DEFAULT, BIG is assumed.
* @async_size: Size of struct used for async work.
*/
struct regmap_bus {
bool fast_io;
regmap_hw_write write;
regmap_hw_gather_write gather_write;
regmap_hw_async_write async_write;
regmap_hw_read read;
regmap_hw_free_context free_context;
regmap_hw_async_alloc async_alloc;
u8 read_flag_mask;
enum regmap_endian reg_format_endian_default;
enum regmap_endian val_format_endian_default;
@ -310,6 +323,8 @@ int regmap_raw_write(struct regmap *map, unsigned int reg,
const void *val, size_t val_len);
int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val,
size_t val_count);
int regmap_raw_write_async(struct regmap *map, unsigned int reg,
const void *val, size_t val_len);
int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val);
int regmap_raw_read(struct regmap *map, unsigned int reg,
void *val, size_t val_len);
@ -321,6 +336,7 @@ int regmap_update_bits_check(struct regmap *map, unsigned int reg,
unsigned int mask, unsigned int val,
bool *change);
int regmap_get_val_bytes(struct regmap *map);
int regmap_async_complete(struct regmap *map);
int regcache_sync(struct regmap *map);
int regcache_sync_region(struct regmap *map, unsigned int min,
@ -422,6 +438,13 @@ static inline int regmap_raw_write(struct regmap *map, unsigned int reg,
return -EINVAL;
}
static inline int regmap_raw_write_async(struct regmap *map, unsigned int reg,
const void *val, size_t val_len)
{
WARN_ONCE(1, "regmap API is disabled");
return -EINVAL;
}
static inline int regmap_bulk_write(struct regmap *map, unsigned int reg,
const void *val, size_t val_count)
{
@ -500,6 +523,11 @@ static inline void regcache_mark_dirty(struct regmap *map)
WARN_ONCE(1, "regmap API is disabled");
}
static inline void regmap_async_complete(struct regmap *map)
{
WARN_ONCE(1, "regmap API is disabled");
}
static inline int regmap_register_patch(struct regmap *map,
const struct reg_default *regs,
int num_regs)