diff options
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/regmap/regcache-rbtree.c | 70 |
1 files changed, 69 insertions, 1 deletions
diff --git a/drivers/base/regmap/regcache-rbtree.c b/drivers/base/regmap/regcache-rbtree.c index 04531961560..792a760c8ab 100644 --- a/drivers/base/regmap/regcache-rbtree.c +++ b/drivers/base/regmap/regcache-rbtree.c @@ -36,6 +36,8 @@ struct regcache_rbtree_node { struct regcache_rbtree_ctx { struct rb_root root; struct regcache_rbtree_node *cached_rbnode; + unsigned long *reg_present; + unsigned int reg_present_nbits; }; static inline void regcache_rbtree_get_base_top_reg( @@ -146,6 +148,7 @@ static int rbtree_show(struct seq_file *s, void *ignored) map->lock(map); mem_size = sizeof(*rbtree_ctx); + mem_size += BITS_TO_LONGS(rbtree_ctx->reg_present_nbits) * sizeof(long); for (node = rb_first(&rbtree_ctx->root); node != NULL; node = rb_next(node)) { @@ -196,6 +199,44 @@ static void rbtree_debugfs_init(struct regmap *map) } #endif +static int enlarge_reg_present_bitmap(struct regmap *map, unsigned int reg) +{ + struct regcache_rbtree_ctx *rbtree_ctx; + unsigned long *reg_present; + unsigned int reg_present_size; + unsigned int nregs; + int i; + + rbtree_ctx = map->cache; + nregs = reg + 1; + reg_present_size = BITS_TO_LONGS(nregs); + reg_present_size *= sizeof(long); + + if (!rbtree_ctx->reg_present) { + reg_present = kmalloc(reg_present_size, GFP_KERNEL); + if (!reg_present) + return -ENOMEM; + bitmap_zero(reg_present, nregs); + rbtree_ctx->reg_present = reg_present; + rbtree_ctx->reg_present_nbits = nregs; + return 0; + } + + if (nregs > rbtree_ctx->reg_present_nbits) { + reg_present = krealloc(rbtree_ctx->reg_present, + reg_present_size, GFP_KERNEL); + if (!reg_present) + return -ENOMEM; + for (i = 0; i < nregs; i++) + if (i >= rbtree_ctx->reg_present_nbits) + clear_bit(i, reg_present); + rbtree_ctx->reg_present = reg_present; + rbtree_ctx->reg_present_nbits = nregs; + } + + return 0; +} + static int regcache_rbtree_init(struct regmap *map) { struct regcache_rbtree_ctx *rbtree_ctx; @@ -209,6 +250,8 @@ static int regcache_rbtree_init(struct regmap *map) rbtree_ctx = map->cache; rbtree_ctx->root = RB_ROOT; rbtree_ctx->cached_rbnode = NULL; + rbtree_ctx->reg_present = NULL; + rbtree_ctx->reg_present_nbits = 0; for (i = 0; i < map->num_reg_defaults; i++) { ret = regcache_rbtree_write(map, @@ -238,6 +281,8 @@ static int regcache_rbtree_exit(struct regmap *map) if (!rbtree_ctx) return 0; + kfree(rbtree_ctx->reg_present); + /* free up the rbtree */ next = rb_first(&rbtree_ctx->root); while (next) { @@ -255,6 +300,17 @@ static int regcache_rbtree_exit(struct regmap *map) return 0; } +static int regcache_reg_present(struct regmap *map, unsigned int reg) +{ + struct regcache_rbtree_ctx *rbtree_ctx; + + rbtree_ctx = map->cache; + if (!(rbtree_ctx->reg_present[BIT_WORD(reg)] & BIT_MASK(reg))) + return 0; + return 1; + +} + static int regcache_rbtree_read(struct regmap *map, unsigned int reg, unsigned int *value) { @@ -264,6 +320,8 @@ static int regcache_rbtree_read(struct regmap *map, rbnode = regcache_rbtree_lookup(map, reg); if (rbnode) { reg_tmp = (reg - rbnode->base_reg) / map->reg_stride; + if (!regcache_reg_present(map, reg)) + return -ENOENT; *value = regcache_rbtree_get_register(map, rbnode, reg_tmp); } else { return -ENOENT; @@ -313,6 +371,12 @@ static int regcache_rbtree_write(struct regmap *map, unsigned int reg, int ret; rbtree_ctx = map->cache; + /* update the reg_present bitmap, make space if necessary */ + ret = enlarge_reg_present_bitmap(map, reg); + if (ret < 0) + return ret; + set_bit(reg, rbtree_ctx->reg_present); + /* if we can't locate it in the cached rbnode we'll have * to traverse the rbtree looking for it. */ @@ -354,7 +418,7 @@ static int regcache_rbtree_write(struct regmap *map, unsigned int reg, rbnode = kzalloc(sizeof *rbnode, GFP_KERNEL); if (!rbnode) return -ENOMEM; - rbnode->blklen = 1; + rbnode->blklen = sizeof(*rbnode); rbnode->base_reg = reg; rbnode->block = kmalloc(rbnode->blklen * map->cache_word_size, GFP_KERNEL); @@ -404,6 +468,10 @@ static int regcache_rbtree_sync(struct regmap *map, unsigned int min, for (i = base; i < end; i++) { regtmp = rbnode->base_reg + (i * map->reg_stride); + + if (!regcache_reg_present(map, regtmp)) + continue; + val = regcache_rbtree_get_register(map, rbnode, i); /* Is this the hardware default? If so skip. */ |