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Date: Fri, 5 Aug 2022 23:53:21 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Mark Brown <broonie@...nel.org>,
Aidan MacDonald <aidanmacdonald.0x0@...il.com>,
linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
"Rafael J. Wysocki" <rafael@...nel.org>
Subject: [PATCH v1 5/5] regmap: mmio: Introduce IO accessors that can talk to IO port
Currently regmap MMIO is inconsistent with IO accessors. I.e.
the Big Endian counterparts are using ioreadXXbe() / iowriteXXbe()
which are not clean implementations of readXXbe(). Besides that
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.
That said, reimplement current Big Endian MMIO accessors by replacing
ioread()/iowrite() with respective read()/write() and swab() calls.
While at it, add IO port support with a corresponding flag added.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
drivers/base/regmap/regmap-mmio.c | 102 +++++++++++++++++++++++++++---
include/linux/regmap.h | 3 +
2 files changed, 96 insertions(+), 9 deletions(-)
diff --git a/drivers/base/regmap/regmap-mmio.c b/drivers/base/regmap/regmap-mmio.c
index 698295a8f5a6..6a0d370ac83b 100644
--- a/drivers/base/regmap/regmap-mmio.c
+++ b/drivers/base/regmap/regmap-mmio.c
@@ -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)
@@ -88,9 +94,21 @@ 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)
+{
+ writew(swab16(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);
}
@@ -109,9 +127,21 @@ 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)
+{
+ writel(swab32(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);
}
@@ -144,6 +174,12 @@ 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)
{
@@ -156,8 +192,20 @@ 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 swab16(readw(ctx->regs + reg));
+}
+
+static unsigned int regmap_mmio_ioread16be(struct regmap_mmio_context *ctx,
+ unsigned int reg)
{
return ioread16be(ctx->regs + reg);
}
@@ -174,8 +222,20 @@ 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 swab32(readl(ctx->regs + reg));
+}
+
+static unsigned int regmap_mmio_ioread32be(struct regmap_mmio_context *ctx,
+ unsigned int reg)
{
return ioread32be(ctx->regs + reg);
}
@@ -253,7 +313,10 @@ 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 {
@@ -262,7 +325,10 @@ 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 {
@@ -271,7 +337,10 @@ 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 {
@@ -290,16 +359,31 @@ 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;
diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index 7cf2157134ac..8cccc247cd37 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -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;
--
2.35.1
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