diff options
Diffstat (limited to 'drivers/base/regmap/regmap-mmio.c')
| -rw-r--r-- | drivers/base/regmap/regmap-mmio.c | 164 |
1 files changed, 140 insertions, 24 deletions
diff --git a/drivers/base/regmap/regmap-mmio.c b/drivers/base/regmap/regmap-mmio.c index f05fc74dd84..04a329a377e 100644 --- a/drivers/base/regmap/regmap-mmio.c +++ b/drivers/base/regmap/regmap-mmio.c @@ -16,8 +16,8 @@ * along with this program. If not, see <http://www.gnu.org/licenses/>. */ +#include <linux/clk.h> #include <linux/err.h> -#include <linux/init.h> #include <linux/io.h> #include <linux/module.h> #include <linux/regmap.h> @@ -25,19 +25,83 @@ struct regmap_mmio_context { void __iomem *regs; + unsigned reg_bytes; unsigned val_bytes; + unsigned pad_bytes; + struct clk *clk; }; +static inline void regmap_mmio_regsize_check(size_t reg_size) +{ + switch (reg_size) { + case 1: + case 2: + case 4: +#ifdef CONFIG_64BIT + case 8: +#endif + break; + default: + BUG(); + } +} + +static int regmap_mmio_regbits_check(size_t reg_bits) +{ + switch (reg_bits) { + case 8: + case 16: + case 32: +#ifdef CONFIG_64BIT + case 64: +#endif + return 0; + default: + return -EINVAL; + } +} + +static inline void regmap_mmio_count_check(size_t count, u32 offset) +{ + BUG_ON(count <= offset); +} + +static inline unsigned int +regmap_mmio_get_offset(const void *reg, size_t reg_size) +{ + switch (reg_size) { + case 1: + return *(u8 *)reg; + case 2: + return *(u16 *)reg; + case 4: + return *(u32 *)reg; +#ifdef CONFIG_64BIT + case 8: + return *(u64 *)reg; +#endif + default: + BUG(); + } +} + static int regmap_mmio_gather_write(void *context, const void *reg, size_t reg_size, const void *val, size_t val_size) { struct regmap_mmio_context *ctx = context; - u32 offset; + unsigned int offset; + int ret; - BUG_ON(reg_size != 4); + regmap_mmio_regsize_check(reg_size); - offset = *(u32 *)reg; + if (!IS_ERR(ctx->clk)) { + ret = clk_enable(ctx->clk); + if (ret < 0) + return ret; + } + + offset = regmap_mmio_get_offset(reg, reg_size); while (val_size) { switch (ctx->val_bytes) { @@ -64,14 +128,21 @@ static int regmap_mmio_gather_write(void *context, offset += ctx->val_bytes; } + if (!IS_ERR(ctx->clk)) + clk_disable(ctx->clk); + return 0; } static int regmap_mmio_write(void *context, const void *data, size_t count) { - BUG_ON(count < 4); + struct regmap_mmio_context *ctx = context; + unsigned int offset = ctx->reg_bytes + ctx->pad_bytes; - return regmap_mmio_gather_write(context, data, 4, data + 4, count - 4); + regmap_mmio_count_check(count, offset); + + return regmap_mmio_gather_write(context, data, ctx->reg_bytes, + data + offset, count - offset); } static int regmap_mmio_read(void *context, @@ -79,11 +150,18 @@ static int regmap_mmio_read(void *context, void *val, size_t val_size) { struct regmap_mmio_context *ctx = context; - u32 offset; + unsigned int offset; + int ret; + + regmap_mmio_regsize_check(reg_size); - BUG_ON(reg_size != 4); + if (!IS_ERR(ctx->clk)) { + ret = clk_enable(ctx->clk); + if (ret < 0) + return ret; + } - offset = *(u32 *)reg; + offset = regmap_mmio_get_offset(reg, reg_size); while (val_size) { switch (ctx->val_bytes) { @@ -110,11 +188,20 @@ static int regmap_mmio_read(void *context, offset += ctx->val_bytes; } + if (!IS_ERR(ctx->clk)) + clk_disable(ctx->clk); + return 0; } static void regmap_mmio_free_context(void *context) { + struct regmap_mmio_context *ctx = context; + + if (!IS_ERR(ctx->clk)) { + clk_unprepare(ctx->clk); + clk_put(ctx->clk); + } kfree(context); } @@ -128,14 +215,18 @@ static struct regmap_bus regmap_mmio = { .val_format_endian_default = REGMAP_ENDIAN_NATIVE, }; -static struct regmap_mmio_context *regmap_mmio_gen_context(void __iomem *regs, +static struct regmap_mmio_context *regmap_mmio_gen_context(struct device *dev, + const char *clk_id, + void __iomem *regs, const struct regmap_config *config) { struct regmap_mmio_context *ctx; int min_stride; + int ret; - if (config->reg_bits != 32) - return ERR_PTR(-EINVAL); + ret = regmap_mmio_regbits_check(config->reg_bits); + if (ret) + return ERR_PTR(ret); if (config->pad_bits) return ERR_PTR(-EINVAL); @@ -178,38 +269,63 @@ static struct regmap_mmio_context *regmap_mmio_gen_context(void __iomem *regs, ctx->regs = regs; ctx->val_bytes = config->val_bits / 8; + ctx->reg_bytes = config->reg_bits / 8; + ctx->pad_bytes = config->pad_bits / 8; + ctx->clk = ERR_PTR(-ENODEV); + + if (clk_id == NULL) + return ctx; + + ctx->clk = clk_get(dev, clk_id); + if (IS_ERR(ctx->clk)) { + ret = PTR_ERR(ctx->clk); + goto err_free; + } + + ret = clk_prepare(ctx->clk); + if (ret < 0) { + clk_put(ctx->clk); + goto err_free; + } return ctx; + +err_free: + kfree(ctx); + + return ERR_PTR(ret); } /** - * regmap_init_mmio(): Initialise register map + * regmap_init_mmio_clk(): Initialise register map with register clock * * @dev: Device that will be interacted with + * @clk_id: register clock consumer ID * @regs: Pointer to memory-mapped IO region * @config: Configuration for register map * * The return value will be an ERR_PTR() on error or a valid pointer to * a struct regmap. */ -struct regmap *regmap_init_mmio(struct device *dev, - void __iomem *regs, - const struct regmap_config *config) +struct regmap *regmap_init_mmio_clk(struct device *dev, const char *clk_id, + void __iomem *regs, + const struct regmap_config *config) { struct regmap_mmio_context *ctx; - ctx = regmap_mmio_gen_context(regs, config); + ctx = regmap_mmio_gen_context(dev, clk_id, regs, config); if (IS_ERR(ctx)) return ERR_CAST(ctx); return regmap_init(dev, ®map_mmio, ctx, config); } -EXPORT_SYMBOL_GPL(regmap_init_mmio); +EXPORT_SYMBOL_GPL(regmap_init_mmio_clk); /** - * devm_regmap_init_mmio(): Initialise managed register map + * devm_regmap_init_mmio_clk(): Initialise managed register map with clock * * @dev: Device that will be interacted with + * @clk_id: register clock consumer ID * @regs: Pointer to memory-mapped IO region * @config: Configuration for register map * @@ -217,18 +333,18 @@ EXPORT_SYMBOL_GPL(regmap_init_mmio); * to a struct regmap. The regmap will be automatically freed by the * device management code. */ -struct regmap *devm_regmap_init_mmio(struct device *dev, - void __iomem *regs, - const struct regmap_config *config) +struct regmap *devm_regmap_init_mmio_clk(struct device *dev, const char *clk_id, + void __iomem *regs, + const struct regmap_config *config) { struct regmap_mmio_context *ctx; - ctx = regmap_mmio_gen_context(regs, config); + ctx = regmap_mmio_gen_context(dev, clk_id, regs, config); if (IS_ERR(ctx)) return ERR_CAST(ctx); return devm_regmap_init(dev, ®map_mmio, ctx, config); } -EXPORT_SYMBOL_GPL(devm_regmap_init_mmio); +EXPORT_SYMBOL_GPL(devm_regmap_init_mmio_clk); MODULE_LICENSE("GPL v2"); |