mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 19:29:37 +00:00
regmap: spmi: support base and extended register spaces
SPMI states that a slave may contain two register spaces, the Base register space is a 5-bit byte-addressable space accessed via the Register Read/Write and Register Zero Write command sequences, and the Extended register space: a 16-bit byte-addressable space accessed via the Extended Read/Write and Extended Read/Write Long command sequences. Provide support for accessing both of these spaces, taking advantage of the more bandwidth-efficient commands ('Register 0 Write' vs 'Register Write', and 'Extended Register Read/Write' vs 'Extended Register Read/Write Long') when possible. Signed-off-by: Josh Cartwright <joshc@codeaurora.org> Acked-by: Mark Brown <broonie@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
2c9e577d97
commit
c9afbb05a9
2 changed files with 208 additions and 38 deletions
|
@ -22,69 +22,235 @@
|
|||
#include <linux/module.h>
|
||||
#include <linux/init.h>
|
||||
|
||||
static int regmap_spmi_read(void *context,
|
||||
static int regmap_spmi_base_read(void *context,
|
||||
const void *reg, size_t reg_size,
|
||||
void *val, size_t val_size)
|
||||
{
|
||||
BUG_ON(reg_size != 2);
|
||||
return spmi_ext_register_readl(context, *(u16 *)reg,
|
||||
val, val_size);
|
||||
u8 addr = *(u8 *)reg;
|
||||
int err = 0;
|
||||
|
||||
BUG_ON(reg_size != 1);
|
||||
|
||||
while (val_size-- && !err)
|
||||
err = spmi_register_read(context, addr++, val++);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static int regmap_spmi_gather_write(void *context,
|
||||
static int regmap_spmi_base_gather_write(void *context,
|
||||
const void *reg, size_t reg_size,
|
||||
const void *val, size_t val_size)
|
||||
{
|
||||
BUG_ON(reg_size != 2);
|
||||
return spmi_ext_register_writel(context, *(u16 *)reg, val, val_size);
|
||||
const u8 *data = val;
|
||||
u8 addr = *(u8 *)reg;
|
||||
int err = 0;
|
||||
|
||||
BUG_ON(reg_size != 1);
|
||||
|
||||
/*
|
||||
* SPMI defines a more bandwidth-efficient 'Register 0 Write' sequence,
|
||||
* use it when possible.
|
||||
*/
|
||||
if (addr == 0 && val_size) {
|
||||
err = spmi_register_zero_write(context, *data);
|
||||
if (err)
|
||||
goto err_out;
|
||||
|
||||
data++;
|
||||
addr++;
|
||||
val_size--;
|
||||
}
|
||||
|
||||
static int regmap_spmi_write(void *context, const void *data,
|
||||
while (val_size) {
|
||||
err = spmi_register_write(context, addr, *data);
|
||||
if (err)
|
||||
goto err_out;
|
||||
|
||||
data++;
|
||||
addr++;
|
||||
val_size--;
|
||||
}
|
||||
|
||||
err_out:
|
||||
return err;
|
||||
}
|
||||
|
||||
static int regmap_spmi_base_write(void *context, const void *data,
|
||||
size_t count)
|
||||
{
|
||||
BUG_ON(count < 2);
|
||||
return regmap_spmi_gather_write(context, data, 2, data + 2, count - 2);
|
||||
BUG_ON(count < 1);
|
||||
return regmap_spmi_base_gather_write(context, data, 1, data + 1,
|
||||
count - 1);
|
||||
}
|
||||
|
||||
static struct regmap_bus regmap_spmi = {
|
||||
.read = regmap_spmi_read,
|
||||
.write = regmap_spmi_write,
|
||||
.gather_write = regmap_spmi_gather_write,
|
||||
static struct regmap_bus regmap_spmi_base = {
|
||||
.read = regmap_spmi_base_read,
|
||||
.write = regmap_spmi_base_write,
|
||||
.gather_write = regmap_spmi_base_gather_write,
|
||||
.reg_format_endian_default = REGMAP_ENDIAN_NATIVE,
|
||||
.val_format_endian_default = REGMAP_ENDIAN_NATIVE,
|
||||
};
|
||||
|
||||
/**
|
||||
* regmap_init_spmi(): Initialize register map
|
||||
*
|
||||
* @sdev: Device that will be interacted with
|
||||
* regmap_init_spmi_base(): Create regmap for the Base register space
|
||||
* @sdev: SPMI device that will be interacted with
|
||||
* @config: Configuration for register map
|
||||
*
|
||||
* The return value will be an ERR_PTR() on error or a valid pointer to
|
||||
* a struct regmap.
|
||||
*/
|
||||
struct regmap *regmap_init_spmi(struct spmi_device *sdev,
|
||||
struct regmap *regmap_init_spmi_base(struct spmi_device *sdev,
|
||||
const struct regmap_config *config)
|
||||
{
|
||||
return regmap_init(&sdev->dev, ®map_spmi, sdev, config);
|
||||
return regmap_init(&sdev->dev, ®map_spmi_base, sdev, config);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(regmap_init_spmi);
|
||||
EXPORT_SYMBOL_GPL(regmap_init_spmi_base);
|
||||
|
||||
/**
|
||||
* devm_regmap_init_spmi(): Initialise managed register map
|
||||
*
|
||||
* @sdev: Device that will be interacted with
|
||||
* devm_regmap_init_spmi_base(): Create managed regmap for Base register space
|
||||
* @sdev: SPMI device that will be interacted with
|
||||
* @config: Configuration for register map
|
||||
*
|
||||
* The return value will be an ERR_PTR() on error or a valid pointer
|
||||
* to a struct regmap. The regmap will be automatically freed by the
|
||||
* device management code.
|
||||
*/
|
||||
struct regmap *devm_regmap_init_spmi(struct spmi_device *sdev,
|
||||
struct regmap *devm_regmap_init_spmi_base(struct spmi_device *sdev,
|
||||
const struct regmap_config *config)
|
||||
{
|
||||
return devm_regmap_init(&sdev->dev, ®map_spmi, sdev, config);
|
||||
return devm_regmap_init(&sdev->dev, ®map_spmi_base, sdev, config);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(devm_regmap_init_spmi);
|
||||
EXPORT_SYMBOL_GPL(devm_regmap_init_spmi_base);
|
||||
|
||||
static int regmap_spmi_ext_read(void *context,
|
||||
const void *reg, size_t reg_size,
|
||||
void *val, size_t val_size)
|
||||
{
|
||||
int err = 0;
|
||||
size_t len;
|
||||
u16 addr;
|
||||
|
||||
BUG_ON(reg_size != 2);
|
||||
|
||||
addr = *(u16 *)reg;
|
||||
|
||||
/*
|
||||
* Split accesses into two to take advantage of the more
|
||||
* bandwidth-efficient 'Extended Register Read' command when possible
|
||||
*/
|
||||
while (addr <= 0xFF && val_size) {
|
||||
len = min_t(size_t, val_size, 16);
|
||||
|
||||
err = spmi_ext_register_read(context, addr, val, len);
|
||||
if (err)
|
||||
goto err_out;
|
||||
|
||||
addr += len;
|
||||
val += len;
|
||||
val_size -= len;
|
||||
}
|
||||
|
||||
while (val_size) {
|
||||
len = min_t(size_t, val_size, 8);
|
||||
|
||||
err = spmi_ext_register_readl(context, addr, val, val_size);
|
||||
if (err)
|
||||
goto err_out;
|
||||
|
||||
addr += len;
|
||||
val += len;
|
||||
val_size -= len;
|
||||
}
|
||||
|
||||
err_out:
|
||||
return err;
|
||||
}
|
||||
|
||||
static int regmap_spmi_ext_gather_write(void *context,
|
||||
const void *reg, size_t reg_size,
|
||||
const void *val, size_t val_size)
|
||||
{
|
||||
int err = 0;
|
||||
size_t len;
|
||||
u16 addr;
|
||||
|
||||
BUG_ON(reg_size != 2);
|
||||
|
||||
addr = *(u16 *)reg;
|
||||
|
||||
while (addr <= 0xFF && val_size) {
|
||||
len = min_t(size_t, val_size, 16);
|
||||
|
||||
err = spmi_ext_register_write(context, addr, val, len);
|
||||
if (err)
|
||||
goto err_out;
|
||||
|
||||
addr += len;
|
||||
val += len;
|
||||
val_size -= len;
|
||||
}
|
||||
|
||||
while (val_size) {
|
||||
len = min_t(size_t, val_size, 8);
|
||||
|
||||
err = spmi_ext_register_writel(context, addr, val, len);
|
||||
if (err)
|
||||
goto err_out;
|
||||
|
||||
addr += len;
|
||||
val += len;
|
||||
val_size -= len;
|
||||
}
|
||||
|
||||
err_out:
|
||||
return err;
|
||||
}
|
||||
|
||||
static int regmap_spmi_ext_write(void *context, const void *data,
|
||||
size_t count)
|
||||
{
|
||||
BUG_ON(count < 2);
|
||||
return regmap_spmi_ext_gather_write(context, data, 2, data + 2,
|
||||
count - 2);
|
||||
}
|
||||
|
||||
static struct regmap_bus regmap_spmi_ext = {
|
||||
.read = regmap_spmi_ext_read,
|
||||
.write = regmap_spmi_ext_write,
|
||||
.gather_write = regmap_spmi_ext_gather_write,
|
||||
.reg_format_endian_default = REGMAP_ENDIAN_NATIVE,
|
||||
.val_format_endian_default = REGMAP_ENDIAN_NATIVE,
|
||||
};
|
||||
|
||||
/**
|
||||
* regmap_init_spmi_ext(): Create regmap for Ext register space
|
||||
* @sdev: Device that will be interacted with
|
||||
* @config: Configuration for register map
|
||||
*
|
||||
* The return value will be an ERR_PTR() on error or a valid pointer to
|
||||
* a struct regmap.
|
||||
*/
|
||||
struct regmap *regmap_init_spmi_ext(struct spmi_device *sdev,
|
||||
const struct regmap_config *config)
|
||||
{
|
||||
return regmap_init(&sdev->dev, ®map_spmi_ext, sdev, config);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(regmap_init_spmi_ext);
|
||||
|
||||
/**
|
||||
* devm_regmap_init_spmi_ext(): Create managed regmap for Ext register space
|
||||
* @sdev: SPMI device that will be interacted with
|
||||
* @config: Configuration for register map
|
||||
*
|
||||
* The return value will be an ERR_PTR() on error or a valid pointer
|
||||
* to a struct regmap. The regmap will be automatically freed by the
|
||||
* device management code.
|
||||
*/
|
||||
struct regmap *devm_regmap_init_spmi_ext(struct spmi_device *sdev,
|
||||
const struct regmap_config *config)
|
||||
{
|
||||
return devm_regmap_init(&sdev->dev, ®map_spmi_ext, sdev, config);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(devm_regmap_init_spmi_ext);
|
||||
|
||||
MODULE_LICENSE("GPL");
|
||||
|
|
|
@ -321,7 +321,9 @@ struct regmap *regmap_init_i2c(struct i2c_client *i2c,
|
|||
const struct regmap_config *config);
|
||||
struct regmap *regmap_init_spi(struct spi_device *dev,
|
||||
const struct regmap_config *config);
|
||||
struct regmap *regmap_init_spmi(struct spmi_device *dev,
|
||||
struct regmap *regmap_init_spmi_base(struct spmi_device *dev,
|
||||
const struct regmap_config *config);
|
||||
struct regmap *regmap_init_spmi_ext(struct spmi_device *dev,
|
||||
const struct regmap_config *config);
|
||||
struct regmap *regmap_init_mmio_clk(struct device *dev, const char *clk_id,
|
||||
void __iomem *regs,
|
||||
|
@ -335,7 +337,9 @@ struct regmap *devm_regmap_init_i2c(struct i2c_client *i2c,
|
|||
const struct regmap_config *config);
|
||||
struct regmap *devm_regmap_init_spi(struct spi_device *dev,
|
||||
const struct regmap_config *config);
|
||||
struct regmap *devm_regmap_init_spmi(struct spmi_device *dev,
|
||||
struct regmap *devm_regmap_init_spmi_base(struct spmi_device *dev,
|
||||
const struct regmap_config *config);
|
||||
struct regmap *devm_regmap_init_spmi_ext(struct spmi_device *dev,
|
||||
const struct regmap_config *config);
|
||||
struct regmap *devm_regmap_init_mmio_clk(struct device *dev, const char *clk_id,
|
||||
void __iomem *regs,
|
||||
|
|
Loading…
Reference in a new issue