From: Davide Ciminaghi Date: Tue, 16 Oct 2012 13:56:59 +0000 (+0200) Subject: regmap: make lock/unlock functions customizable X-Git-Tag: upstream/snapshot3+hdmi~6112^2~2^2 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=0d4529c534c1c664f25088eb5f5b4d7ce0ee2510;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git regmap: make lock/unlock functions customizable It is sometimes convenient for a regmap user to override the standard regmap lock/unlock functions with custom functions. For instance this can be useful in case an already existing spinlock or mutex has to be used for locking a set of registers instead of the internal regmap spinlock/mutex. Note that the fast_io field of struct regmap_bus is ignored in case custom locking functions are used. Signed-off-by: Davide Ciminaghi Signed-off-by: Mark Brown --- diff --git a/drivers/base/regmap/internal.h b/drivers/base/regmap/internal.h index 80f9ab9..b1ee824 100644 --- a/drivers/base/regmap/internal.h +++ b/drivers/base/regmap/internal.h @@ -31,14 +31,12 @@ struct regmap_format { unsigned int (*parse_val)(void *buf); }; -typedef void (*regmap_lock)(struct regmap *map); -typedef void (*regmap_unlock)(struct regmap *map); - struct regmap { struct mutex mutex; spinlock_t spinlock; regmap_lock lock; regmap_unlock unlock; + void *lock_arg; /* This is passed to lock/unlock functions */ struct device *dev; /* Device we do I/O on */ void *work_buf; /* Scratch buffer used to format I/O */ diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c index 52069d2..5d8b7525 100644 --- a/drivers/base/regmap/regmap.c +++ b/drivers/base/regmap/regmap.c @@ -214,23 +214,27 @@ static unsigned int regmap_parse_32_native(void *buf) return *(u32 *)buf; } -static void regmap_lock_mutex(struct regmap *map) +static void regmap_lock_mutex(void *__map) { + struct regmap *map = __map; mutex_lock(&map->mutex); } -static void regmap_unlock_mutex(struct regmap *map) +static void regmap_unlock_mutex(void *__map) { + struct regmap *map = __map; mutex_unlock(&map->mutex); } -static void regmap_lock_spinlock(struct regmap *map) +static void regmap_lock_spinlock(void *__map) { + struct regmap *map = __map; spin_lock(&map->spinlock); } -static void regmap_unlock_spinlock(struct regmap *map) +static void regmap_unlock_spinlock(void *__map) { + struct regmap *map = __map; spin_unlock(&map->spinlock); } @@ -335,14 +339,21 @@ struct regmap *regmap_init(struct device *dev, goto err; } - if (bus->fast_io) { - spin_lock_init(&map->spinlock); - map->lock = regmap_lock_spinlock; - map->unlock = regmap_unlock_spinlock; + if (config->lock && config->unlock) { + map->lock = config->lock; + map->unlock = config->unlock; + map->lock_arg = config->lock_arg; } else { - mutex_init(&map->mutex); - map->lock = regmap_lock_mutex; - map->unlock = regmap_unlock_mutex; + if (bus->fast_io) { + spin_lock_init(&map->spinlock); + map->lock = regmap_lock_spinlock; + map->unlock = regmap_unlock_spinlock; + } else { + mutex_init(&map->mutex); + map->lock = regmap_lock_mutex; + map->unlock = regmap_unlock_mutex; + } + map->lock_arg = map; } map->format.reg_bytes = DIV_ROUND_UP(config->reg_bits, 8); map->format.pad_bytes = config->pad_bits / 8; @@ -939,11 +950,11 @@ int regmap_write(struct regmap *map, unsigned int reg, unsigned int val) if (reg % map->reg_stride) return -EINVAL; - map->lock(map); + map->lock(map->lock_arg); ret = _regmap_write(map, reg, val); - map->unlock(map); + map->unlock(map->lock_arg); return ret; } @@ -975,11 +986,11 @@ int regmap_raw_write(struct regmap *map, unsigned int reg, if (reg % map->reg_stride) return -EINVAL; - map->lock(map); + map->lock(map->lock_arg); ret = _regmap_raw_write(map, reg, val, val_len); - map->unlock(map); + map->unlock(map->lock_arg); return ret; } @@ -1011,7 +1022,7 @@ int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val, if (reg % map->reg_stride) return -EINVAL; - map->lock(map); + map->lock(map->lock_arg); /* No formatting is require if val_byte is 1 */ if (val_bytes == 1) { @@ -1047,7 +1058,7 @@ int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val, kfree(wval); out: - map->unlock(map); + map->unlock(map->lock_arg); return ret; } EXPORT_SYMBOL_GPL(regmap_bulk_write); @@ -1137,11 +1148,11 @@ int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val) if (reg % map->reg_stride) return -EINVAL; - map->lock(map); + map->lock(map->lock_arg); ret = _regmap_read(map, reg, val); - map->unlock(map); + map->unlock(map->lock_arg); return ret; } @@ -1171,7 +1182,7 @@ int regmap_raw_read(struct regmap *map, unsigned int reg, void *val, if (reg % map->reg_stride) return -EINVAL; - map->lock(map); + map->lock(map->lock_arg); if (regmap_volatile_range(map, reg, val_count) || map->cache_bypass || map->cache_type == REGCACHE_NONE) { @@ -1193,7 +1204,7 @@ int regmap_raw_read(struct regmap *map, unsigned int reg, void *val, } out: - map->unlock(map); + map->unlock(map->lock_arg); return ret; } @@ -1300,9 +1311,9 @@ int regmap_update_bits(struct regmap *map, unsigned int reg, bool change; int ret; - map->lock(map); + map->lock(map->lock_arg); ret = _regmap_update_bits(map, reg, mask, val, &change); - map->unlock(map); + map->unlock(map->lock_arg); return ret; } @@ -1326,9 +1337,9 @@ int regmap_update_bits_check(struct regmap *map, unsigned int reg, { int ret; - map->lock(map); + map->lock(map->lock_arg); ret = _regmap_update_bits(map, reg, mask, val, change); - map->unlock(map); + map->unlock(map->lock_arg); return ret; } EXPORT_SYMBOL_GPL(regmap_update_bits_check); @@ -1357,7 +1368,7 @@ int regmap_register_patch(struct regmap *map, const struct reg_default *regs, if (map->patch) return -EBUSY; - map->lock(map); + map->lock(map->lock_arg); bypass = map->cache_bypass; @@ -1385,7 +1396,7 @@ int regmap_register_patch(struct regmap *map, const struct reg_default *regs, out: map->cache_bypass = bypass; - map->unlock(map); + map->unlock(map->lock_arg); return ret; } diff --git a/include/linux/regmap.h b/include/linux/regmap.h index e3bcc3f..5d24378 100644 --- a/include/linux/regmap.h +++ b/include/linux/regmap.h @@ -53,6 +53,9 @@ enum regmap_endian { REGMAP_ENDIAN_NATIVE, }; +typedef void (*regmap_lock)(void *); +typedef void (*regmap_unlock)(void *); + /** * Configuration for the register map of a device. * @@ -75,6 +78,12 @@ enum regmap_endian { * @precious_reg: Optional callback returning true if the rgister * should not be read outside of a call from the driver * (eg, a clear on read interrupt status register). + * @lock: Optional lock callback (overrides regmap's default lock + * function, based on spinlock or mutex). + * @unlock: As above for unlocking. + * @lock_arg: this field is passed as the only argument of lock/unlock + * functions (ignored in case regular lock/unlock functions + * are not overridden). * * @max_register: Optional, specifies the maximum valid register index. * @reg_defaults: Power on reset values for registers (for use with @@ -116,6 +125,9 @@ struct regmap_config { bool (*readable_reg)(struct device *dev, unsigned int reg); bool (*volatile_reg)(struct device *dev, unsigned int reg); bool (*precious_reg)(struct device *dev, unsigned int reg); + regmap_lock lock; + regmap_unlock unlock; + void *lock_arg; unsigned int max_register; const struct reg_default *reg_defaults; @@ -181,7 +193,9 @@ typedef void (*regmap_hw_free_context)(void *context); * Description of a hardware bus for the register map infrastructure. * * @fast_io: Register IO is fast. Use a spinlock instead of a mutex - * to perform locking. + * to perform locking. This field is ignored if custom lock/unlock + * functions are used (see fields lock/unlock of + * struct regmap_config). * @write: Write operation. * @gather_write: Write operation with split register/value, return -ENOTSUPP * if not implemented on a given device.