diff options
Diffstat (limited to 'drivers/pinctrl/tegra/pinctrl-tegra20.c')
| -rw-r--r-- | drivers/pinctrl/tegra/pinctrl-tegra20.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/drivers/pinctrl/tegra/pinctrl-tegra20.c b/drivers/pinctrl/tegra/pinctrl-tegra20.c new file mode 100644 index 0000000000..d5171b8be2 --- /dev/null +++ b/drivers/pinctrl/tegra/pinctrl-tegra20.c @@ -0,0 +1,177 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * (C) Copyright 2023 + * Svyatoslav Ryhel <clamor95@gmail.com> + */ + +#include <dm.h> +#include <dm/device_compat.h> +#include <dm/pinctrl.h> +#include <stdlib.h> + +#include <asm/arch/pinmux.h> + +static void tegra_pinctrl_set_pin(struct udevice *config) +{ + int i, count, pin_id, ret; + int pull, tristate; + const char **pins; + + ret = dev_read_u32(config, "nvidia,pull", &pull); + if (ret) + pull = ret; + + ret = dev_read_u32(config, "nvidia,tristate", &tristate); + if (ret) + tristate = ret; + + count = dev_read_string_list(config, "nvidia,pins", &pins); + if (count < 0) { + log_debug("%s: could not parse property nvidia,pins\n", __func__); + return; + } + + for (i = 0; i < count; i++) { + for (pin_id = 0; pin_id < PMUX_PINGRP_COUNT; pin_id++) + if (tegra_pinctrl_to_pingrp[pin_id]) + if (!strcmp(pins[i], tegra_pinctrl_to_pingrp[pin_id])) + break; + + if (pull >= 0) + pinmux_set_pullupdown(pin_id, pull); + + if (tristate >= 0) { + if (!tristate) + pinmux_tristate_disable(pin_id); + else + pinmux_tristate_enable(pin_id); + } + } + + free(pins); +} + +static void tegra_pinctrl_set_func(struct udevice *config) +{ + int i, count, func_id, pin_id; + const char *function; + const char **pins; + + function = dev_read_string(config, "nvidia,function"); + if (function) + for (i = 0; i < PMUX_FUNC_COUNT; i++) + if (tegra_pinctrl_to_func[i]) + if (!strcmp(function, tegra_pinctrl_to_func[i])) + break; + + func_id = i; + + count = dev_read_string_list(config, "nvidia,pins", &pins); + if (count < 0) { + log_debug("%s: could not parse property nvidia,pins\n", __func__); + return; + } + + for (i = 0; i < count; i++) { + for (pin_id = 0; pin_id < PMUX_PINGRP_COUNT; pin_id++) + if (tegra_pinctrl_to_pingrp[pin_id]) + if (!strcmp(pins[i], tegra_pinctrl_to_pingrp[pin_id])) + break; + + debug("%s(%d) muxed to %s(%d)\n", pins[i], pin_id, function, func_id); + + pinmux_set_func(pin_id, func_id); + } + + free(pins); +} + +static int tegra_pinctrl_set_state(struct udevice *dev, struct udevice *config) +{ + struct udevice *child; + + device_foreach_child(child, config) { + /* + * Tegra20 pinmux is set differently then any other + * Tegra SOC. Nodes are arranged by function muxing, + * then actual pins setup (with node name prefix + * conf_*) and then drive setup. + */ + if (!strncmp(child->name, "conf_", 5)) + tegra_pinctrl_set_pin(child); + else if (!strncmp(child->name, "drive_", 6)) + debug("%s: drive configuration is not supported\n", __func__); + else + tegra_pinctrl_set_func(child); + } + + return 0; +} + +static int tegra_pinctrl_get_pins_count(struct udevice *dev) +{ + return PMUX_PINGRP_COUNT; +} + +static const char *tegra_pinctrl_get_pin_name(struct udevice *dev, + unsigned int selector) +{ + return tegra_pinctrl_to_pingrp[selector]; +} + +static int tegra_pinctrl_get_groups_count(struct udevice *dev) +{ + return PMUX_DRVGRP_COUNT; +} + +static const char *tegra_pinctrl_get_group_name(struct udevice *dev, + unsigned int selector) +{ + return tegra_pinctrl_to_drvgrp[selector]; +} + +static int tegra_pinctrl_get_functions_count(struct udevice *dev) +{ + return PMUX_FUNC_COUNT; +} + +static const char *tegra_pinctrl_get_function_name(struct udevice *dev, + unsigned int selector) +{ + return tegra_pinctrl_to_func[selector]; +} + +const struct pinctrl_ops tegra_pinctrl_ops = { + .get_pins_count = tegra_pinctrl_get_pins_count, + .get_pin_name = tegra_pinctrl_get_pin_name, + .get_groups_count = tegra_pinctrl_get_groups_count, + .get_group_name = tegra_pinctrl_get_group_name, + .get_functions_count = tegra_pinctrl_get_functions_count, + .get_function_name = tegra_pinctrl_get_function_name, + .set_state = tegra_pinctrl_set_state, +}; + +static int tegra_pinctrl_bind(struct udevice *dev) +{ + /* + * Make sure that the pinctrl driver gets probed after binding + * to provide initial configuration and assure that further + * probed devices are working correctly. + */ + dev_or_flags(dev, DM_FLAG_PROBE_AFTER_BIND); + + return 0; +} + +static const struct udevice_id tegra_pinctrl_ids[] = { + { .compatible = "nvidia,tegra20-pinmux" }, + { }, +}; + +U_BOOT_DRIVER(tegra_pinctrl) = { + .name = "tegra_pinctrl", + .id = UCLASS_PINCTRL, + .of_match = tegra_pinctrl_ids, + .bind = tegra_pinctrl_bind, + .ops = &tegra_pinctrl_ops, +}; |