diff options
Diffstat (limited to 'drivers/base/regmap/regmap-mmio.c')
| -rw-r--r-- | drivers/base/regmap/regmap-mmio.c | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/drivers/base/regmap/regmap-mmio.c b/drivers/base/regmap/regmap-mmio.c index eed488aad1b0..e8d2675463ac 100644 --- a/drivers/base/regmap/regmap-mmio.c +++ b/drivers/base/regmap/regmap-mmio.c @@ -16,6 +16,7 @@ struct regmap_mmio_context { void __iomem *regs; unsigned int val_bytes; + bool big_endian; bool attached_clk; struct clk *clk; @@ -165,6 +166,83 @@ static int regmap_mmio_write(void *context, unsigned int reg, unsigned int val) return 0; } +static int regmap_mmio_noinc_write(void *context, unsigned int reg, + const void *val, size_t val_count) +{ + struct regmap_mmio_context *ctx = context; + int ret = 0; + int i; + + if (!IS_ERR(ctx->clk)) { + ret = clk_enable(ctx->clk); + if (ret < 0) + return ret; + } + + /* + * There are no native, assembly-optimized write single register + * operations for big endian, so fall back to emulation if this + * is needed. (Single bytes are fine, they are not affected by + * endianness.) + */ + if (ctx->big_endian && (ctx->val_bytes > 1)) { + switch (ctx->val_bytes) { + case 2: + { + const u16 *valp = (const u16 *)val; + for (i = 0; i < val_count; i++) + writew(swab16(valp[i]), ctx->regs + reg); + goto out_clk; + } + case 4: + { + const u32 *valp = (const u32 *)val; + for (i = 0; i < val_count; i++) + writel(swab32(valp[i]), ctx->regs + reg); + goto out_clk; + } +#ifdef CONFIG_64BIT + case 8: + { + const u64 *valp = (const u64 *)val; + for (i = 0; i < val_count; i++) + writeq(swab64(valp[i]), ctx->regs + reg); + goto out_clk; + } +#endif + default: + ret = -EINVAL; + goto out_clk; + } + } + + switch (ctx->val_bytes) { + case 1: + writesb(ctx->regs + reg, (const u8 *)val, val_count); + break; + case 2: + writesw(ctx->regs + reg, (const u16 *)val, val_count); + break; + case 4: + writesl(ctx->regs + reg, (const u32 *)val, val_count); + break; +#ifdef CONFIG_64BIT + case 8: + writesq(ctx->regs + reg, (const u64 *)val, val_count); + break; +#endif + default: + ret = -EINVAL; + break; + } + +out_clk: + if (!IS_ERR(ctx->clk)) + clk_disable(ctx->clk); + + return ret; +} + static unsigned int regmap_mmio_read8(struct regmap_mmio_context *ctx, unsigned int reg) { @@ -262,6 +340,87 @@ static int regmap_mmio_read(void *context, unsigned int reg, unsigned int *val) return 0; } +static int regmap_mmio_noinc_read(void *context, unsigned int reg, + void *val, size_t val_count) +{ + struct regmap_mmio_context *ctx = context; + int ret = 0; + int i; + + if (!IS_ERR(ctx->clk)) { + ret = clk_enable(ctx->clk); + if (ret < 0) + return ret; + } + + switch (ctx->val_bytes) { + case 1: + readsb(ctx->regs + reg, (u8 *)val, val_count); + break; + case 2: + readsw(ctx->regs + reg, (u16 *)val, val_count); + break; + case 4: + readsl(ctx->regs + reg, (u32 *)val, val_count); + break; +#ifdef CONFIG_64BIT + case 8: + readsq(ctx->regs + reg, (u64 *)val, val_count); + break; +#endif + default: + ret = -EINVAL; + goto out_clk; + } + + /* + * There are no native, assembly-optimized write single register + * operations for big endian, so fall back to emulation if this + * is needed. (Single bytes are fine, they are not affected by + * endianness.) + */ + if (ctx->big_endian && (ctx->val_bytes > 1)) { + switch (ctx->val_bytes) { + case 2: + { + u16 *valp = (u16 *)val; + for (i = 0; i < val_count; i++) + valp[i] = swab16(valp[i]); + break; + } + case 4: + { + u32 *valp = (u32 *)val; + for (i = 0; i < val_count; i++) + valp[i] = swab32(valp[i]); + break; + } +#ifdef CONFIG_64BIT + case 8: + { + u64 *valp = (u64 *)val; + for (i = 0; i < val_count; i++) + valp[i] = swab64(valp[i]); + break; + } +#endif + default: + ret = -EINVAL; + break; + } + } + + +out_clk: + if (!IS_ERR(ctx->clk)) + clk_disable(ctx->clk); + + return ret; + + return 0; +} + + static void regmap_mmio_free_context(void *context) { struct regmap_mmio_context *ctx = context; @@ -278,6 +437,8 @@ static const struct regmap_bus regmap_mmio = { .fast_io = true, .reg_write = regmap_mmio_write, .reg_read = regmap_mmio_read, + .reg_noinc_write = regmap_mmio_noinc_write, + .reg_noinc_read = regmap_mmio_noinc_read, .free_context = regmap_mmio_free_context, .val_format_endian_default = REGMAP_ENDIAN_LITTLE, }; @@ -368,6 +529,7 @@ static struct regmap_mmio_context *regmap_mmio_gen_context(struct device *dev, #ifdef __BIG_ENDIAN case REGMAP_ENDIAN_NATIVE: #endif + ctx->big_endian = true; switch (config->val_bits) { case 8: if (config->io_port) { |