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path: root/drivers/base/regmap/regmap-mmio.c
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Diffstat (limited to 'drivers/base/regmap/regmap-mmio.c')
-rw-r--r--drivers/base/regmap/regmap-mmio.c262
1 files changed, 142 insertions, 120 deletions
diff --git a/drivers/base/regmap/regmap-mmio.c b/drivers/base/regmap/regmap-mmio.c
index eea51569f..5189fd618 100644
--- a/drivers/base/regmap/regmap-mmio.c
+++ b/drivers/base/regmap/regmap-mmio.c
@@ -23,28 +23,18 @@
#include <linux/regmap.h>
#include <linux/slab.h>
+#include "internal.h"
+
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();
- }
-}
+ void (*reg_write)(struct regmap_mmio_context *ctx,
+ unsigned int reg, unsigned int val);
+ unsigned int (*reg_read)(struct regmap_mmio_context *ctx,
+ unsigned int reg);
+};
static int regmap_mmio_regbits_check(size_t reg_bits)
{
@@ -88,72 +78,62 @@ static int regmap_mmio_get_min_stride(size_t val_bits)
return min_stride;
}
-static inline void regmap_mmio_count_check(size_t count, u32 offset)
+static void regmap_mmio_write8(struct regmap_mmio_context *ctx,
+ unsigned int reg,
+ unsigned int val)
+{
+ writeb(val, ctx->regs + reg);
+}
+
+static void regmap_mmio_write16le(struct regmap_mmio_context *ctx,
+ unsigned int reg,
+ unsigned int val)
+{
+ writew(val, ctx->regs + reg);
+}
+
+static void regmap_mmio_write16be(struct regmap_mmio_context *ctx,
+ unsigned int reg,
+ unsigned int val)
+{
+ iowrite16be(val, ctx->regs + reg);
+}
+
+static void regmap_mmio_write32le(struct regmap_mmio_context *ctx,
+ unsigned int reg,
+ unsigned int val)
{
- BUG_ON(count <= offset);
+ writel(val, ctx->regs + reg);
}
-static inline unsigned int
-regmap_mmio_get_offset(const void *reg, size_t reg_size)
+static void regmap_mmio_write32be(struct regmap_mmio_context *ctx,
+ unsigned int reg,
+ unsigned int val)
{
- switch (reg_size) {
- case 1:
- return *(u8 *)reg;
- case 2:
- return *(u16 *)reg;
- case 4:
- return *(u32 *)reg;
+ iowrite32be(val, ctx->regs + reg);
+}
+
#ifdef CONFIG_64BIT
- case 8:
- return *(u64 *)reg;
-#endif
- default:
- BUG();
- }
+static void regmap_mmio_write64le(struct regmap_mmio_context *ctx,
+ unsigned int reg,
+ unsigned int val)
+{
+ writeq(val, ctx->regs + reg);
}
+#endif
-static int regmap_mmio_gather_write(void *context,
- const void *reg, size_t reg_size,
- const void *val, size_t val_size)
+static int regmap_mmio_write(void *context, unsigned int reg, unsigned int val)
{
struct regmap_mmio_context *ctx = context;
- unsigned int offset;
int ret;
- regmap_mmio_regsize_check(reg_size);
-
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) {
- case 1:
- writeb(*(u8 *)val, ctx->regs + offset);
- break;
- case 2:
- writew(*(u16 *)val, ctx->regs + offset);
- break;
- case 4:
- writel(*(u32 *)val, ctx->regs + offset);
- break;
-#ifdef CONFIG_64BIT
- case 8:
- writeq(*(u64 *)val, ctx->regs + offset);
- break;
-#endif
- default:
- /* Should be caught by regmap_mmio_check_config */
- BUG();
- }
- val_size -= ctx->val_bytes;
- val += ctx->val_bytes;
- offset += ctx->val_bytes;
- }
+ ctx->reg_write(ctx, reg, val);
if (!IS_ERR(ctx->clk))
clk_disable(ctx->clk);
@@ -161,59 +141,56 @@ static int regmap_mmio_gather_write(void *context,
return 0;
}
-static int regmap_mmio_write(void *context, const void *data, size_t count)
+static unsigned int regmap_mmio_read8(struct regmap_mmio_context *ctx,
+ unsigned int reg)
{
- struct regmap_mmio_context *ctx = context;
- unsigned int offset = ctx->reg_bytes + ctx->pad_bytes;
+ return readb(ctx->regs + reg);
+}
+
+static unsigned int regmap_mmio_read16le(struct regmap_mmio_context *ctx,
+ unsigned int reg)
+{
+ return readw(ctx->regs + reg);
+}
- regmap_mmio_count_check(count, offset);
+static unsigned int regmap_mmio_read16be(struct regmap_mmio_context *ctx,
+ unsigned int reg)
+{
+ return ioread16be(ctx->regs + reg);
+}
- return regmap_mmio_gather_write(context, data, ctx->reg_bytes,
- data + offset, count - offset);
+static unsigned int regmap_mmio_read32le(struct regmap_mmio_context *ctx,
+ unsigned int reg)
+{
+ return readl(ctx->regs + reg);
}
-static int regmap_mmio_read(void *context,
- const void *reg, size_t reg_size,
- void *val, size_t val_size)
+static unsigned int regmap_mmio_read32be(struct regmap_mmio_context *ctx,
+ unsigned int reg)
+{
+ return ioread32be(ctx->regs + reg);
+}
+
+#ifdef CONFIG_64BIT
+static unsigned int regmap_mmio_read64le(struct regmap_mmio_context *ctx,
+ unsigned int reg)
+{
+ return readq(ctx->regs + reg);
+}
+#endif
+
+static int regmap_mmio_read(void *context, unsigned int reg, unsigned int *val)
{
struct regmap_mmio_context *ctx = context;
- unsigned int offset;
int ret;
- regmap_mmio_regsize_check(reg_size);
-
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) {
- case 1:
- *(u8 *)val = readb(ctx->regs + offset);
- break;
- case 2:
- *(u16 *)val = readw(ctx->regs + offset);
- break;
- case 4:
- *(u32 *)val = readl(ctx->regs + offset);
- break;
-#ifdef CONFIG_64BIT
- case 8:
- *(u64 *)val = readq(ctx->regs + offset);
- break;
-#endif
- default:
- /* Should be caught by regmap_mmio_check_config */
- BUG();
- }
- val_size -= ctx->val_bytes;
- val += ctx->val_bytes;
- offset += ctx->val_bytes;
- }
+ *val = ctx->reg_read(ctx, reg);
if (!IS_ERR(ctx->clk))
clk_disable(ctx->clk);
@@ -232,14 +209,12 @@ static void regmap_mmio_free_context(void *context)
kfree(context);
}
-static struct regmap_bus regmap_mmio = {
+static const struct regmap_bus regmap_mmio = {
.fast_io = true,
- .write = regmap_mmio_write,
- .gather_write = regmap_mmio_gather_write,
- .read = regmap_mmio_read,
+ .reg_write = regmap_mmio_write,
+ .reg_read = regmap_mmio_read,
.free_context = regmap_mmio_free_context,
- .reg_format_endian_default = REGMAP_ENDIAN_NATIVE,
- .val_format_endian_default = REGMAP_ENDIAN_NATIVE,
+ .val_format_endian_default = REGMAP_ENDIAN_LITTLE,
};
static struct regmap_mmio_context *regmap_mmio_gen_context(struct device *dev,
@@ -265,24 +240,71 @@ static struct regmap_mmio_context *regmap_mmio_gen_context(struct device *dev,
if (config->reg_stride < min_stride)
return ERR_PTR(-EINVAL);
- switch (config->reg_format_endian) {
- case REGMAP_ENDIAN_DEFAULT:
- case REGMAP_ENDIAN_NATIVE:
- break;
- default:
- return ERR_PTR(-EINVAL);
- }
-
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return ERR_PTR(-ENOMEM);
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);
+ switch (regmap_get_val_endian(dev, &regmap_mmio, config)) {
+ case REGMAP_ENDIAN_DEFAULT:
+ case REGMAP_ENDIAN_LITTLE:
+#ifdef __LITTLE_ENDIAN
+ case REGMAP_ENDIAN_NATIVE:
+#endif
+ switch (config->val_bits) {
+ case 8:
+ 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;
+ break;
+ case 32:
+ 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;
+ break;
+#endif
+ default:
+ ret = -EINVAL;
+ goto err_free;
+ }
+ break;
+ case REGMAP_ENDIAN_BIG:
+#ifdef __BIG_ENDIAN
+ case REGMAP_ENDIAN_NATIVE:
+#endif
+ switch (config->val_bits) {
+ case 8:
+ ctx->reg_read = regmap_mmio_read8;
+ ctx->reg_write = regmap_mmio_write8;
+ break;
+ case 16:
+ ctx->reg_read = regmap_mmio_read16be;
+ ctx->reg_write = regmap_mmio_write16be;
+ break;
+ case 32:
+ ctx->reg_read = regmap_mmio_read32be;
+ ctx->reg_write = regmap_mmio_write32be;
+ break;
+ default:
+ ret = -EINVAL;
+ goto err_free;
+ }
+ break;
+ default:
+ ret = -EINVAL;
+ goto err_free;
+ }
+
if (clk_id == NULL)
return ctx;