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