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regmap: mmio: Introduce IO accessors that can talk to IO port

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Some users may use regmap MMIO for IO ports, and this can be done
by assigning ioreadXX()/iowriteXX() and their Big Endian counterparts
to the regmap context.

Add IO port support with a corresponding flag added.

While doing that, make sure that user won't select relaxed MMIO access
along with IO port because the latter have no relaxed variants.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: William Breathitt Gray <william.gray@linaro.org>
Link: https://lore.kernel.org/r/20220808203401.35153-4-andriy.shevchenko@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Andy Shevchenko 2022-08-08 23:33:59 +03:00 committed by Mark Brown
parent 159dfabd20
commit 93ce557679
No known key found for this signature in database
GPG key ID: 24D68B725D5487D0
2 changed files with 99 additions and 9 deletions
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105
drivers/base/regmap/regmap-mmio.c
View file

@ -74,6 +74,12 @@ static void regmap_mmio_write8_relaxed(struct regmap_mmio_context *ctx,
writeb_relaxed(val, ctx->regs + reg);
}
static void regmap_mmio_iowrite8(struct regmap_mmio_context *ctx,
unsigned int reg, unsigned int val)
{
iowrite8(val, ctx->regs + reg);
}
static void regmap_mmio_write16le(struct regmap_mmio_context *ctx,
unsigned int reg,
unsigned int val)
@ -88,6 +94,12 @@ static void regmap_mmio_write16le_relaxed(struct regmap_mmio_context *ctx,
writew_relaxed(val, ctx->regs + reg);
}
static void regmap_mmio_iowrite16le(struct regmap_mmio_context *ctx,
unsigned int reg, unsigned int val)
{
iowrite16(val, ctx->regs + reg);
}
static void regmap_mmio_write16be(struct regmap_mmio_context *ctx,
unsigned int reg,
unsigned int val)
@ -95,6 +107,12 @@ static void regmap_mmio_write16be(struct regmap_mmio_context *ctx,
iowrite16be(val, ctx->regs + reg);
}
static void regmap_mmio_iowrite16be(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)
@ -109,6 +127,12 @@ static void regmap_mmio_write32le_relaxed(struct regmap_mmio_context *ctx,
writel_relaxed(val, ctx->regs + reg);
}
static void regmap_mmio_iowrite32le(struct regmap_mmio_context *ctx,
unsigned int reg, unsigned int val)
{
iowrite32(val, ctx->regs + reg);
}
static void regmap_mmio_write32be(struct regmap_mmio_context *ctx,
unsigned int reg,
unsigned int val)
@ -116,6 +140,12 @@ static void regmap_mmio_write32be(struct regmap_mmio_context *ctx,
iowrite32be(val, ctx->regs + reg);
}
static void regmap_mmio_iowrite32be(struct regmap_mmio_context *ctx,
unsigned int reg, unsigned int val)
{
iowrite32be(val, ctx->regs + reg);
}
static int regmap_mmio_write(void *context, unsigned int reg, unsigned int val)
{
struct regmap_mmio_context *ctx = context;
@ -147,6 +177,12 @@ static unsigned int regmap_mmio_read8_relaxed(struct regmap_mmio_context *ctx,
return readb_relaxed(ctx->regs + reg);
}
static unsigned int regmap_mmio_ioread8(struct regmap_mmio_context *ctx,
unsigned int reg)
{
return ioread8(ctx->regs + reg);
}
static unsigned int regmap_mmio_read16le(struct regmap_mmio_context *ctx,
unsigned int reg)
{
@ -159,12 +195,24 @@ static unsigned int regmap_mmio_read16le_relaxed(struct regmap_mmio_context *ctx
return readw_relaxed(ctx->regs + reg);
}
static unsigned int regmap_mmio_ioread16le(struct regmap_mmio_context *ctx,
unsigned int reg)
{
return ioread16(ctx->regs + reg);
}
static unsigned int regmap_mmio_read16be(struct regmap_mmio_context *ctx,
unsigned int reg)
{
return ioread16be(ctx->regs + reg);
}
static unsigned int regmap_mmio_ioread16be(struct regmap_mmio_context *ctx,
unsigned int reg)
{
return ioread16be(ctx->regs + reg);
}
static unsigned int regmap_mmio_read32le(struct regmap_mmio_context *ctx,
unsigned int reg)
{
@ -177,12 +225,24 @@ static unsigned int regmap_mmio_read32le_relaxed(struct regmap_mmio_context *ctx
return readl_relaxed(ctx->regs + reg);
}
static unsigned int regmap_mmio_ioread32le(struct regmap_mmio_context *ctx,
unsigned int reg)
{
return ioread32(ctx->regs + reg);
}
static unsigned int regmap_mmio_read32be(struct regmap_mmio_context *ctx,
unsigned int reg)
{
return ioread32be(ctx->regs + reg);
}
static unsigned int regmap_mmio_ioread32be(struct regmap_mmio_context *ctx,
unsigned int reg)
{
return ioread32be(ctx->regs + reg);
}
static int regmap_mmio_read(void *context, unsigned int reg, unsigned int *val)
{
struct regmap_mmio_context *ctx = context;
@ -245,6 +305,9 @@ static struct regmap_mmio_context *regmap_mmio_gen_context(struct device *dev,
if (config->reg_stride < min_stride)
return ERR_PTR(-EINVAL);
if (config->use_relaxed_mmio && config->io_port)
return ERR_PTR(-EINVAL);
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return ERR_PTR(-ENOMEM);
@ -261,7 +324,10 @@ static struct regmap_mmio_context *regmap_mmio_gen_context(struct device *dev,
#endif
switch (config->val_bits) {
case 8:
if (config->use_relaxed_mmio) {
if (config->io_port) {
ctx->reg_read = regmap_mmio_ioread8;
ctx->reg_write = regmap_mmio_iowrite8;
} else if (config->use_relaxed_mmio) {
ctx->reg_read = regmap_mmio_read8_relaxed;
ctx->reg_write = regmap_mmio_write8_relaxed;
} else {
@ -270,7 +336,10 @@ static struct regmap_mmio_context *regmap_mmio_gen_context(struct device *dev,
}
break;
case 16:
if (config->use_relaxed_mmio) {
if (config->io_port) {
ctx->reg_read = regmap_mmio_ioread16le;
ctx->reg_write = regmap_mmio_iowrite16le;
} else if (config->use_relaxed_mmio) {
ctx->reg_read = regmap_mmio_read16le_relaxed;
ctx->reg_write = regmap_mmio_write16le_relaxed;
} else {
@ -279,7 +348,10 @@ static struct regmap_mmio_context *regmap_mmio_gen_context(struct device *dev,
}
break;
case 32:
if (config->use_relaxed_mmio) {
if (config->io_port) {
ctx->reg_read = regmap_mmio_ioread32le;
ctx->reg_write = regmap_mmio_iowrite32le;
} else if (config->use_relaxed_mmio) {
ctx->reg_read = regmap_mmio_read32le_relaxed;
ctx->reg_write = regmap_mmio_write32le_relaxed;
} else {
@ -298,16 +370,31 @@ 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 (config->io_port) {
ctx->reg_read = regmap_mmio_ioread8;
ctx->reg_write = regmap_mmio_iowrite8;
} else {
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;
if (config->io_port) {
ctx->reg_read = regmap_mmio_ioread16be;
ctx->reg_write = regmap_mmio_iowrite16be;
} else {
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;
if (config->io_port) {
ctx->reg_read = regmap_mmio_ioread32be;
ctx->reg_write = regmap_mmio_iowrite32be;
} else {
ctx->reg_read = regmap_mmio_read32be;
ctx->reg_write = regmap_mmio_write32be;
}
break;
default:
ret = -EINVAL;

3
include/linux/regmap.h
View file

@ -311,6 +311,8 @@ typedef void (*regmap_unlock)(void *);
* This field is a duplicate of a similar file in
* 'struct regmap_bus' and serves exact same purpose.
* Use it only for "no-bus" cases.
* @io_port: Support IO port accessors. Makes sense only when MMIO vs. IO port
* access can be distinguished.
* @max_register: Optional, specifies the maximum valid register address.
* @wr_table: Optional, points to a struct regmap_access_table specifying
* valid ranges for write access.
@ -399,6 +401,7 @@ struct regmap_config {
size_t max_raw_write;
bool fast_io;
bool io_port;
unsigned int max_register;
const struct regmap_access_table *wr_table;