diff options
| -rw-r--r-- | drivers/base/regmap/regmap-mmio.c | 90 | ||||
| -rw-r--r-- | include/linux/regmap.h | 5 |
2 files changed, 87 insertions, 8 deletions
diff --git a/drivers/base/regmap/regmap-mmio.c b/drivers/base/regmap/regmap-mmio.c index af967d8f975e..f9cd51afb9d2 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 val_bytes; + bool relaxed_mmio; bool attached_clk; struct clk *clk; @@ -75,6 +76,13 @@ static void regmap_mmio_write8(struct regmap_mmio_context *ctx, writeb(val, ctx->regs + reg); } +static void regmap_mmio_write8_relaxed(struct regmap_mmio_context *ctx, + unsigned int reg, + unsigned int val) +{ + writeb_relaxed(val, ctx->regs + reg); +} + static void regmap_mmio_write16le(struct regmap_mmio_context *ctx, unsigned int reg, unsigned int val) @@ -82,6 +90,13 @@ static void regmap_mmio_write16le(struct regmap_mmio_context *ctx, writew(val, ctx->regs + reg); } +static void regmap_mmio_write16le_relaxed(struct regmap_mmio_context *ctx, + unsigned int reg, + unsigned int val) +{ + writew_relaxed(val, ctx->regs + reg); +} + static void regmap_mmio_write16be(struct regmap_mmio_context *ctx, unsigned int reg, unsigned int val) @@ -96,6 +111,13 @@ static void regmap_mmio_write32le(struct regmap_mmio_context *ctx, writel(val, ctx->regs + reg); } +static void regmap_mmio_write32le_relaxed(struct regmap_mmio_context *ctx, + unsigned int reg, + unsigned int val) +{ + writel_relaxed(val, ctx->regs + reg); +} + static void regmap_mmio_write32be(struct regmap_mmio_context *ctx, unsigned int reg, unsigned int val) @@ -110,6 +132,13 @@ static void regmap_mmio_write64le(struct regmap_mmio_context *ctx, { writeq(val, ctx->regs + reg); } + +static void regmap_mmio_write64le_relaxed(struct regmap_mmio_context *ctx, + unsigned int reg, + unsigned int val) +{ + writeq_relaxed(val, ctx->regs + reg); +} #endif static int regmap_mmio_write(void *context, unsigned int reg, unsigned int val) @@ -137,12 +166,24 @@ static unsigned int regmap_mmio_read8(struct regmap_mmio_context *ctx, return readb(ctx->regs + reg); } +static unsigned int regmap_mmio_read8_relaxed(struct regmap_mmio_context *ctx, + unsigned int reg) +{ + return readb_relaxed(ctx->regs + reg); +} + static unsigned int regmap_mmio_read16le(struct regmap_mmio_context *ctx, unsigned int reg) { return readw(ctx->regs + reg); } +static unsigned int regmap_mmio_read16le_relaxed(struct regmap_mmio_context *ctx, + unsigned int reg) +{ + return readw_relaxed(ctx->regs + reg); +} + static unsigned int regmap_mmio_read16be(struct regmap_mmio_context *ctx, unsigned int reg) { @@ -155,6 +196,12 @@ static unsigned int regmap_mmio_read32le(struct regmap_mmio_context *ctx, return readl(ctx->regs + reg); } +static unsigned int regmap_mmio_read32le_relaxed(struct regmap_mmio_context *ctx, + unsigned int reg) +{ + return readl_relaxed(ctx->regs + reg); +} + static unsigned int regmap_mmio_read32be(struct regmap_mmio_context *ctx, unsigned int reg) { @@ -167,6 +214,12 @@ static unsigned int regmap_mmio_read64le(struct regmap_mmio_context *ctx, { return readq(ctx->regs + reg); } + +static unsigned int regmap_mmio_read64le_relaxed(struct regmap_mmio_context *ctx, + unsigned int reg) +{ + return readq_relaxed(ctx->regs + reg); +} #endif static int regmap_mmio_read(void *context, unsigned int reg, unsigned int *val) @@ -237,6 +290,7 @@ static struct regmap_mmio_context *regmap_mmio_gen_context(struct device *dev, ctx->regs = regs; ctx->val_bytes = config->val_bits / 8; + ctx->relaxed_mmio = config->use_relaxed_mmio; ctx->clk = ERR_PTR(-ENODEV); switch (regmap_get_val_endian(dev, ®map_mmio, config)) { @@ -247,21 +301,41 @@ static struct regmap_mmio_context *regmap_mmio_gen_context(struct device *dev, #endif switch (config->val_bits) { case 8: - ctx->reg_read = regmap_mmio_read8; - ctx->reg_write = regmap_mmio_write8; + if (ctx->relaxed_mmio) { + ctx->reg_read = regmap_mmio_read8_relaxed; + ctx->reg_write = regmap_mmio_write8_relaxed; + } else { + ctx->reg_read = regmap_mmio_read8; + ctx->reg_write = regmap_mmio_write8; + } break; case 16: - ctx->reg_read = regmap_mmio_read16le; - ctx->reg_write = regmap_mmio_write16le; + if (ctx->relaxed_mmio) { + ctx->reg_read = regmap_mmio_read16le_relaxed; + ctx->reg_write = regmap_mmio_write16le_relaxed; + } else { + ctx->reg_read = regmap_mmio_read16le; + ctx->reg_write = regmap_mmio_write16le; + } break; case 32: - ctx->reg_read = regmap_mmio_read32le; - ctx->reg_write = regmap_mmio_write32le; + if (ctx->relaxed_mmio) { + ctx->reg_read = regmap_mmio_read32le_relaxed; + ctx->reg_write = regmap_mmio_write32le_relaxed; + } else { + ctx->reg_read = regmap_mmio_read32le; + ctx->reg_write = regmap_mmio_write32le; + } break; #ifdef CONFIG_64BIT case 64: - ctx->reg_read = regmap_mmio_read64le; - ctx->reg_write = regmap_mmio_write64le; + if (ctx->relaxed_mmio) { + ctx->reg_read = regmap_mmio_read64le_relaxed; + ctx->reg_write = regmap_mmio_write64le_relaxed; + } else { + ctx->reg_read = regmap_mmio_read64le; + ctx->reg_write = regmap_mmio_write64le; + } break; #endif default: diff --git a/include/linux/regmap.h b/include/linux/regmap.h index e7834d98207f..126fe700d1d8 100644 --- a/include/linux/regmap.h +++ b/include/linux/regmap.h @@ -315,6 +315,10 @@ typedef void (*regmap_unlock)(void *); * masks are used. * @zero_flag_mask: If set, read_flag_mask and write_flag_mask are used even * if they are both empty. + * @use_relaxed_mmio: If set, MMIO R/W operations will not use memory barriers. + * This can avoid load on devices which don't require strict + * orderings, but drivers should carefully add any explicit + * memory barriers when they may require them. * @use_single_read: If set, converts the bulk read operation into a series of * single read operations. This is useful for a device that * does not support bulk read. @@ -388,6 +392,7 @@ struct regmap_config { bool use_single_read; bool use_single_write; + bool use_relaxed_mmio; bool can_multi_write; enum regmap_endian reg_format_endian; |