u-boot/drivers/pinctrl/pinctrl-sandbox.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2020 Sean Anderson <seanga2@gmail.com>
* Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.com>
*/
#include <common.h>
#include <dm.h>
#include <dm/pinctrl.h>
#include <dt-bindings/pinctrl/sandbox-pinmux.h>
#include <log.h>
#include <linux/bitops.h>
/*
* This driver emulates a pin controller with the following rules:
* - The pinctrl config for each pin must be set individually
* - The first three pins (P0-P2) must be muxed as a group
* - The next two pins (P3-P4) must be muxed as a group
* - The last four pins (P5-P8) must be muxed individually
*/
static const char * const sandbox_pins[] = {
#define PIN(x) \
[x] = "P" #x
PIN(0),
PIN(1),
PIN(2),
PIN(3),
PIN(4),
PIN(5),
PIN(6),
PIN(7),
PIN(8),
#undef PIN
};
static const char * const sandbox_pins_muxing[][2] = {
{ "UART TX", "I2C SCL" },
{ "UART RX", "I2C SDA" },
{ "SPI SCLK", "I2S SCK" },
{ "SPI MOSI", "I2S SD" },
{ "SPI MISO", "I2S WS" },
{ "GPIO0", "SPI CS0" },
{ "GPIO1", "SPI CS1" },
{ "GPIO2", "PWM0" },
{ "GPIO3", "PWM1" },
};
#define SANDBOX_GROUP_I2C_UART 0
#define SANDBOX_GROUP_SPI_I2S 1
static const char * const sandbox_groups[] = {
[SANDBOX_GROUP_I2C_UART] = "I2C_UART",
[SANDBOX_GROUP_SPI_I2S] = "SPI_I2S",
};
static const char * const sandbox_functions[] = {
#define FUNC(id) \
[SANDBOX_PINMUX_##id] = #id
FUNC(UART),
FUNC(I2C),
FUNC(SPI),
FUNC(I2S),
FUNC(GPIO),
FUNC(CS),
FUNC(PWM),
#undef FUNC
};
static const struct pinconf_param sandbox_conf_params[] = {
{ "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
{ "bias-high-impedance", PIN_CONFIG_BIAS_HIGH_IMPEDANCE, 0 },
{ "bias-bus-hold", PIN_CONFIG_BIAS_BUS_HOLD, 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 },
{ "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN, 0 },
{ "drive-open-source", PIN_CONFIG_DRIVE_OPEN_SOURCE, 0 },
{ "drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 },
{ "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 },
{ "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 },
};
/* Bitfield used to save param and value of each pin/selector */
struct sandbox_pinctrl_priv {
unsigned int mux;
unsigned int pins_param[ARRAY_SIZE(sandbox_pins)];
unsigned int pins_value[ARRAY_SIZE(sandbox_pins)];
};
static int sandbox_get_pins_count(struct udevice *dev)
{
return ARRAY_SIZE(sandbox_pins);
}
static const char *sandbox_get_pin_name(struct udevice *dev, unsigned selector)
{
return sandbox_pins[selector];
}
static int sandbox_get_pin_muxing(struct udevice *dev,
unsigned int selector,
char *buf, int size)
{
const struct pinconf_param *p;
struct sandbox_pinctrl_priv *priv = dev_get_priv(dev);
int i;
snprintf(buf, size, "%s",
sandbox_pins_muxing[selector][!!(priv->mux & BIT(selector))]);
if (priv->pins_param[selector]) {
for (i = 0, p = sandbox_conf_params;
i < ARRAY_SIZE(sandbox_conf_params);
i++, p++) {
if ((priv->pins_param[selector] & BIT(p->param)) &&
(!!(priv->pins_value[selector] & BIT(p->param)) ==
p->default_value)) {
strncat(buf, " ", size);
strncat(buf, p->property, size);
}
}
}
strncat(buf, ".", size);
return 0;
}
static int sandbox_get_groups_count(struct udevice *dev)
{
return ARRAY_SIZE(sandbox_groups);
}
static const char *sandbox_get_group_name(struct udevice *dev,
unsigned selector)
{
return sandbox_groups[selector];
}
static int sandbox_get_functions_count(struct udevice *dev)
{
return ARRAY_SIZE(sandbox_functions);
}
static const char *sandbox_get_function_name(struct udevice *dev,
unsigned selector)
{
return sandbox_functions[selector];
}
static int sandbox_pinmux_set(struct udevice *dev, unsigned pin_selector,
unsigned func_selector)
{
int mux;
struct sandbox_pinctrl_priv *priv = dev_get_priv(dev);
debug("sandbox pinmux: pin = %d (%s), function = %d (%s)\n",
pin_selector, sandbox_get_pin_name(dev, pin_selector),
func_selector, sandbox_get_function_name(dev, func_selector));
if (pin_selector < 5)
return -EINVAL;
switch (func_selector) {
case SANDBOX_PINMUX_GPIO:
mux = 0;
break;
case SANDBOX_PINMUX_CS:
case SANDBOX_PINMUX_PWM:
mux = BIT(pin_selector);
break;
default:
return -EINVAL;
}
priv->mux &= ~BIT(pin_selector);
priv->mux |= mux;
priv->pins_param[pin_selector] = 0;
priv->pins_value[pin_selector] = 0;
return 0;
}
static int sandbox_pinmux_group_set(struct udevice *dev,
unsigned group_selector,
unsigned func_selector)
{
bool mux;
int i, group_start, group_end;
struct sandbox_pinctrl_priv *priv = dev_get_priv(dev);
unsigned int mask;
debug("sandbox pinmux: group = %d (%s), function = %d (%s)\n",
group_selector, sandbox_get_group_name(dev, group_selector),
func_selector, sandbox_get_function_name(dev, func_selector));
if (group_selector == SANDBOX_GROUP_I2C_UART) {
group_start = 0;
group_end = 1;
if (func_selector == SANDBOX_PINMUX_UART)
mux = false;
else if (func_selector == SANDBOX_PINMUX_I2C)
mux = true;
else
return -EINVAL;
} else if (group_selector == SANDBOX_GROUP_SPI_I2S) {
group_start = 2;
group_end = 4;
if (func_selector == SANDBOX_PINMUX_SPI)
mux = false;
else if (func_selector == SANDBOX_PINMUX_I2S)
mux = true;
else
return -EINVAL;
} else {
return -EINVAL;
}
mask = GENMASK(group_end, group_start);
priv->mux &= ~mask;
priv->mux |= mux ? mask : 0;
for (i = group_start; i < group_end; i++) {
priv->pins_param[i] = 0;
priv->pins_value[i] = 0;
}
return 0;
}
static int sandbox_pinmux_property_set(struct udevice *dev, u32 pinmux_group)
{
int ret;
unsigned pin_selector = pinmux_group & 0xFFFF;
unsigned func_selector = pinmux_group >> 16;
ret = sandbox_pinmux_set(dev, pin_selector, func_selector);
return ret ? ret : pin_selector;
}
static int sandbox_pinconf_set(struct udevice *dev, unsigned pin_selector,
unsigned param, unsigned argument)
{
struct sandbox_pinctrl_priv *priv = dev_get_priv(dev);
debug("sandbox pinconf: pin = %d (%s), param = %d, arg = %d\n",
pin_selector, sandbox_get_pin_name(dev, pin_selector),
param, argument);
priv->pins_param[pin_selector] |= BIT(param);
if (argument)
priv->pins_value[pin_selector] |= BIT(param);
else
priv->pins_value[pin_selector] &= ~BIT(param);
return 0;
}
static int sandbox_pinconf_group_set(struct udevice *dev,
unsigned group_selector,
unsigned param, unsigned argument)
{
debug("sandbox pinconf: group = %d (%s), param = %d, arg = %d\n",
group_selector, sandbox_get_group_name(dev, group_selector),
param, argument);
return 0;
}
const struct pinctrl_ops sandbox_pinctrl_ops = {
.get_pins_count = sandbox_get_pins_count,
.get_pin_name = sandbox_get_pin_name,
.get_pin_muxing = sandbox_get_pin_muxing,
.get_groups_count = sandbox_get_groups_count,
.get_group_name = sandbox_get_group_name,
.get_functions_count = sandbox_get_functions_count,
.get_function_name = sandbox_get_function_name,
.pinmux_set = sandbox_pinmux_set,
.pinmux_group_set = sandbox_pinmux_group_set,
.pinmux_property_set = sandbox_pinmux_property_set,
.pinconf_num_params = ARRAY_SIZE(sandbox_conf_params),
.pinconf_params = sandbox_conf_params,
.pinconf_set = sandbox_pinconf_set,
.pinconf_group_set = sandbox_pinconf_group_set,
.set_state = pinctrl_generic_set_state,
};
static const struct udevice_id sandbox_pinctrl_match[] = {
{ .compatible = "sandbox,pinctrl" },
{ /* sentinel */ }
};
U_BOOT_DRIVER(sandbox_pinctrl) = {
.name = "sandbox_pinctrl",
.id = UCLASS_PINCTRL,
.of_match = sandbox_pinctrl_match,
.priv_auto = sizeof(struct sandbox_pinctrl_priv),
.ops = &sandbox_pinctrl_ops,
};