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pinctrl: uniphier: support pin configuration 

Support the following DT properties:
  "bias-disable"
  "bias-pull-up"
  "bias-pull-down"
  "bias-pull-pin-default"
  "input-enable"
  "input-disable"

My main motivation is to support pull up/down biasing.  For Pro5 and
later SoCs, the pupdctrl register number is the same as the pinmux
number, so this feature can be supported without having big pin
tables.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
This commit is contained in:
Masahiro Yamada 2017-02-12 18:21:15 +09:00
parent 1b280978c0
commit 6a6b9d5dfd
7 changed files with 134 additions and 12 deletions
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134
drivers/pinctrl/uniphier/pinctrl-uniphier-core.c
View File

@ -5,6 +5,7 @@
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <linux/io.h>
#include <linux/err.h>
#include <linux/sizes.h>
@ -15,6 +16,7 @@
#define UNIPHIER_PINCTRL_PINMUX_BASE 0x1000
#define UNIPHIER_PINCTRL_LOAD_PINMUX 0x1700
#define UNIPHIER_PINCTRL_PUPDCTRL_BASE 0x1a00
#define UNIPHIER_PINCTRL_IECTRL 0x1d00
static const char *uniphier_pinctrl_dummy_name = "_dummy";
@ -55,8 +57,8 @@ static const char *uniphier_pinmux_get_function_name(struct udevice *dev,
return priv->socdata->functions[selector];
}
static void uniphier_pinconf_input_enable_perpin(struct udevice *dev,
unsigned pin)
static int uniphier_pinconf_input_enable_perpin(struct udevice *dev,
unsigned int pin, int enable)
{
struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
unsigned reg;
@ -66,18 +68,30 @@ static void uniphier_pinconf_input_enable_perpin(struct udevice *dev,
mask = BIT(pin % 32);
tmp = readl(priv->base + reg);
tmp |= mask;
if (enable)
tmp |= mask;
else
tmp &= ~mask;
writel(tmp, priv->base + reg);
return 0;
}
static void uniphier_pinconf_input_enable_legacy(struct udevice *dev,
unsigned pin)
static int uniphier_pinconf_input_enable_legacy(struct udevice *dev,
unsigned int pin, int enable)
{
struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
int pins_count = priv->socdata->pins_count;
const struct uniphier_pinctrl_pin *pins = priv->socdata->pins;
int i;
/*
* Multiple pins share one input enable, per-pin disabling is
* impossible.
*/
if (!enable)
return -EINVAL;
for (i = 0; i < pins_count; i++) {
if (pins[i].number == pin) {
unsigned int iectrl;
@ -89,18 +103,115 @@ static void uniphier_pinconf_input_enable_legacy(struct udevice *dev,
writel(tmp, priv->base + UNIPHIER_PINCTRL_IECTRL);
}
}
return 0;
}
static void uniphier_pinconf_input_enable(struct udevice *dev, unsigned pin)
static int uniphier_pinconf_input_enable(struct udevice *dev,
unsigned int pin, int enable)
{
struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
if (priv->socdata->caps & UNIPHIER_PINCTRL_CAPS_PERPIN_IECTRL)
uniphier_pinconf_input_enable_perpin(dev, pin);
return uniphier_pinconf_input_enable_perpin(dev, pin, enable);
else
uniphier_pinconf_input_enable_legacy(dev, pin);
return uniphier_pinconf_input_enable_legacy(dev, pin, enable);
}
#if CONFIG_IS_ENABLED(PINCONF)
static const struct pinconf_param uniphier_pinconf_params[] = {
{ "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
{ "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
{ "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
{ "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 1 },
{ "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 },
{ "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 },
};
static int uniphier_pinconf_bias_set(struct udevice *dev, unsigned int pin,
unsigned int param, unsigned int arg)
{
struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
unsigned int enable = 1;
unsigned int reg;
u32 mask, tmp;
if (!(priv->socdata->caps & UNIPHIER_PINCTRL_CAPS_PUPD_SIMPLE))
return -ENOTSUPP;
switch (param) {
case PIN_CONFIG_BIAS_DISABLE:
enable = 0;
break;
case PIN_CONFIG_BIAS_PULL_UP:
case PIN_CONFIG_BIAS_PULL_DOWN:
if (arg == 0) /* total bias is not supported */
return -EINVAL;
break;
case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
if (arg == 0) /* configuration ignored */
return 0;
default:
BUG();
}
reg = UNIPHIER_PINCTRL_PUPDCTRL_BASE + pin / 32 * 4;
mask = BIT(pin % 32);
tmp = readl(priv->base + reg);
if (enable)
tmp |= mask;
else
tmp &= ~mask;
writel(tmp, priv->base + reg);
return 0;
}
static int uniphier_pinconf_set_one(struct udevice *dev, unsigned int pin,
unsigned int param, unsigned int arg)
{
int ret;
switch (param) {
case PIN_CONFIG_BIAS_DISABLE:
case PIN_CONFIG_BIAS_PULL_UP:
case PIN_CONFIG_BIAS_PULL_DOWN:
case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT:
ret = uniphier_pinconf_bias_set(dev, pin, param, arg);
break;
case PIN_CONFIG_INPUT_ENABLE:
ret = uniphier_pinconf_input_enable(dev, pin, arg);
break;
default:
printf("unsupported configuration parameter %u\n", param);
return -EINVAL;
}
return ret;
}
static int uniphier_pinconf_group_set(struct udevice *dev,
unsigned int group_selector,
unsigned int param, unsigned int arg)
{
struct uniphier_pinctrl_priv *priv = dev_get_priv(dev);
const struct uniphier_pinctrl_group *grp =
&priv->socdata->groups[group_selector];
int i, ret;
for (i = 0; i < grp->num_pins; i++) {
ret = uniphier_pinconf_set_one(dev, grp->pins[i], param, arg);
if (ret)
return ret;
}
return 0;
}
#endif /* CONFIG_IS_ENABLED(PINCONF) */
static void uniphier_pinmux_set_one(struct udevice *dev, unsigned pin,
int muxval)
{
@ -112,7 +223,7 @@ static void uniphier_pinmux_set_one(struct udevice *dev, unsigned pin,
u32 tmp;
/* some pins need input-enabling */
uniphier_pinconf_input_enable(dev, pin);
uniphier_pinconf_input_enable(dev, pin, 1);
if (muxval < 0)
return; /* dedicated pin; nothing to do for pin-mux */
@ -174,6 +285,11 @@ const struct pinctrl_ops uniphier_pinctrl_ops = {
.get_functions_count = uniphier_pinmux_get_functions_count,
.get_function_name = uniphier_pinmux_get_function_name,
.pinmux_group_set = uniphier_pinmux_group_set,
#if CONFIG_IS_ENABLED(PINCONF)
.pinconf_num_params = ARRAY_SIZE(uniphier_pinconf_params),
.pinconf_params = uniphier_pinconf_params,
.pinconf_group_set = uniphier_pinconf_group_set,
#endif
.set_state = pinctrl_generic_set_state,
};

3
drivers/pinctrl/uniphier/pinctrl-uniphier-ld11.c
View File

@ -92,7 +92,8 @@ static struct uniphier_pinctrl_socdata uniphier_ld11_pinctrl_socdata = {
.groups_count = ARRAY_SIZE(uniphier_ld11_groups),
.functions = uniphier_ld11_functions,
.functions_count = ARRAY_SIZE(uniphier_ld11_functions),
.caps = UNIPHIER_PINCTRL_CAPS_PERPIN_IECTRL,
.caps = UNIPHIER_PINCTRL_CAPS_PUPD_SIMPLE |
UNIPHIER_PINCTRL_CAPS_PERPIN_IECTRL,
};
static int uniphier_ld11_pinctrl_probe(struct udevice *dev)

3
drivers/pinctrl/uniphier/pinctrl-uniphier-ld20.c
View File

@ -106,7 +106,8 @@ static struct uniphier_pinctrl_socdata uniphier_ld20_pinctrl_socdata = {
.groups_count = ARRAY_SIZE(uniphier_ld20_groups),
.functions = uniphier_ld20_functions,
.functions_count = ARRAY_SIZE(uniphier_ld20_functions),
.caps = UNIPHIER_PINCTRL_CAPS_PERPIN_IECTRL,
.caps = UNIPHIER_PINCTRL_CAPS_PUPD_SIMPLE |
UNIPHIER_PINCTRL_CAPS_PERPIN_IECTRL,
};
static int uniphier_ld20_pinctrl_probe(struct udevice *dev)

1
drivers/pinctrl/uniphier/pinctrl-uniphier-ld6b.c
View File

@ -140,6 +140,7 @@ static struct uniphier_pinctrl_socdata uniphier_ld6b_pinctrl_socdata = {
.groups_count = ARRAY_SIZE(uniphier_ld6b_groups),
.functions = uniphier_ld6b_functions,
.functions_count = ARRAY_SIZE(uniphier_ld6b_functions),
.caps = UNIPHIER_PINCTRL_CAPS_PUPD_SIMPLE,
};
static int uniphier_ld6b_pinctrl_probe(struct udevice *dev)

3
drivers/pinctrl/uniphier/pinctrl-uniphier-pro5.c
View File

@ -147,7 +147,8 @@ static struct uniphier_pinctrl_socdata uniphier_pro5_pinctrl_socdata = {
.groups_count = ARRAY_SIZE(uniphier_pro5_groups),
.functions = uniphier_pro5_functions,
.functions_count = ARRAY_SIZE(uniphier_pro5_functions),
.caps = UNIPHIER_PINCTRL_CAPS_DBGMUX_SEPARATE,
.caps = UNIPHIER_PINCTRL_CAPS_PUPD_SIMPLE |
UNIPHIER_PINCTRL_CAPS_DBGMUX_SEPARATE,
};
static int uniphier_pro5_pinctrl_probe(struct udevice *dev)

1
drivers/pinctrl/uniphier/pinctrl-uniphier-pxs2.c
View File

@ -140,6 +140,7 @@ static struct uniphier_pinctrl_socdata uniphier_pxs2_pinctrl_socdata = {
.groups_count = ARRAY_SIZE(uniphier_pxs2_groups),
.functions = uniphier_pxs2_functions,
.functions_count = ARRAY_SIZE(uniphier_pxs2_functions),
.caps = UNIPHIER_PINCTRL_CAPS_PUPD_SIMPLE,
};
static int uniphier_pxs2_pinctrl_probe(struct udevice *dev)

1
drivers/pinctrl/uniphier/pinctrl-uniphier.h
View File

@ -67,6 +67,7 @@ struct uniphier_pinctrl_socdata {
const char * const *functions;
int functions_count;
unsigned caps;
#define UNIPHIER_PINCTRL_CAPS_PUPD_SIMPLE BIT(3)
#define UNIPHIER_PINCTRL_CAPS_PERPIN_IECTRL BIT(2)
#define UNIPHIER_PINCTRL_CAPS_DBGMUX_SEPARATE BIT(1)
#define UNIPHIER_PINCTRL_CAPS_MUX_4BIT BIT(0)