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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.com>
- */
- #define LOG_CATEGORY UCLASS_PINCTRL
- #include <common.h>
- #include <malloc.h>
- #include <asm/global_data.h>
- #include <dm/device_compat.h>
- #include <linux/libfdt.h>
- #include <linux/err.h>
- #include <linux/list.h>
- #include <dm.h>
- #include <dm/lists.h>
- #include <dm/pinctrl.h>
- #include <dm/util.h>
- #include <dm/of_access.h>
- DECLARE_GLOBAL_DATA_PTR;
- #if CONFIG_IS_ENABLED(PINCTRL_FULL)
- /**
- * pinctrl_config_one() - apply pinctrl settings for a single node
- *
- * @config: pin configuration node
- * @return: 0 on success, or negative error code on failure
- */
- static int pinctrl_config_one(struct udevice *config)
- {
- struct udevice *pctldev;
- const struct pinctrl_ops *ops;
- pctldev = config;
- for (;;) {
- pctldev = dev_get_parent(pctldev);
- if (!pctldev) {
- dev_err(config, "could not find pctldev\n");
- return -EINVAL;
- }
- if (pctldev->uclass->uc_drv->id == UCLASS_PINCTRL)
- break;
- }
- ops = pinctrl_get_ops(pctldev);
- return ops->set_state(pctldev, config);
- }
- /**
- * pinctrl_select_state_full() - full implementation of pinctrl_select_state
- *
- * @dev: peripheral device
- * @statename: state name, like "default"
- * @return: 0 on success, or negative error code on failure
- */
- static int pinctrl_select_state_full(struct udevice *dev, const char *statename)
- {
- char propname[32]; /* long enough */
- const fdt32_t *list;
- uint32_t phandle;
- struct udevice *config;
- int state, size, i, ret;
- state = dev_read_stringlist_search(dev, "pinctrl-names", statename);
- if (state < 0) {
- char *end;
- /*
- * If statename is not found in "pinctrl-names",
- * assume statename is just the integer state ID.
- */
- state = dectoul(statename, &end);
- if (*end)
- return -EINVAL;
- }
- snprintf(propname, sizeof(propname), "pinctrl-%d", state);
- list = dev_read_prop(dev, propname, &size);
- if (!list)
- return -EINVAL;
- size /= sizeof(*list);
- for (i = 0; i < size; i++) {
- phandle = fdt32_to_cpu(*list++);
- ret = uclass_get_device_by_phandle_id(UCLASS_PINCONFIG, phandle,
- &config);
- if (ret) {
- dev_warn(dev, "%s: uclass_get_device_by_phandle_id: err=%d\n",
- __func__, ret);
- continue;
- }
- ret = pinctrl_config_one(config);
- if (ret) {
- dev_warn(dev, "%s: pinctrl_config_one: err=%d\n",
- __func__, ret);
- continue;
- }
- }
- return 0;
- }
- /**
- * pinconfig_post_bind() - post binding for PINCONFIG uclass
- * Recursively bind its children as pinconfig devices.
- *
- * @dev: pinconfig device
- * @return: 0 on success, or negative error code on failure
- */
- static int pinconfig_post_bind(struct udevice *dev)
- {
- bool pre_reloc_only = !(gd->flags & GD_FLG_RELOC);
- const char *name;
- ofnode node;
- int ret;
- if (!dev_has_ofnode(dev))
- return 0;
- dev_for_each_subnode(node, dev) {
- if (pre_reloc_only &&
- !ofnode_pre_reloc(node))
- continue;
- /*
- * If this node has "compatible" property, this is not
- * a pin configuration node, but a normal device. skip.
- */
- ofnode_get_property(node, "compatible", &ret);
- if (ret >= 0)
- continue;
- /* If this node has "gpio-controller" property, skip */
- if (ofnode_read_bool(node, "gpio-controller"))
- continue;
- if (ret != -FDT_ERR_NOTFOUND)
- return ret;
- name = ofnode_get_name(node);
- if (!name)
- return -EINVAL;
- ret = device_bind_driver_to_node(dev, "pinconfig", name,
- node, NULL);
- if (ret)
- return ret;
- }
- return 0;
- }
- UCLASS_DRIVER(pinconfig) = {
- .id = UCLASS_PINCONFIG,
- #if CONFIG_IS_ENABLED(PINCONF_RECURSIVE)
- .post_bind = pinconfig_post_bind,
- #endif
- .name = "pinconfig",
- };
- U_BOOT_DRIVER(pinconfig_generic) = {
- .name = "pinconfig",
- .id = UCLASS_PINCONFIG,
- };
- #else
- static int pinctrl_select_state_full(struct udevice *dev, const char *statename)
- {
- return -ENODEV;
- }
- static int pinconfig_post_bind(struct udevice *dev)
- {
- return 0;
- }
- #endif
- static int
- pinctrl_gpio_get_pinctrl_and_offset(struct udevice *dev, unsigned offset,
- struct udevice **pctldev,
- unsigned int *pin_selector)
- {
- struct ofnode_phandle_args args;
- unsigned gpio_offset, pfc_base, pfc_pins;
- int ret;
- ret = dev_read_phandle_with_args(dev, "gpio-ranges", NULL, 3,
- 0, &args);
- if (ret) {
- dev_dbg(dev, "%s: dev_read_phandle_with_args: err=%d\n",
- __func__, ret);
- return ret;
- }
- ret = uclass_get_device_by_ofnode(UCLASS_PINCTRL,
- args.node, pctldev);
- if (ret) {
- dev_dbg(dev,
- "%s: uclass_get_device_by_of_offset failed: err=%d\n",
- __func__, ret);
- return ret;
- }
- gpio_offset = args.args[0];
- pfc_base = args.args[1];
- pfc_pins = args.args[2];
- if (offset < gpio_offset || offset > gpio_offset + pfc_pins) {
- dev_dbg(dev,
- "%s: GPIO can not be mapped to pincontrol pin\n",
- __func__);
- return -EINVAL;
- }
- offset -= gpio_offset;
- offset += pfc_base;
- *pin_selector = offset;
- return 0;
- }
- /**
- * pinctrl_gpio_request() - request a single pin to be used as GPIO
- *
- * @dev: GPIO peripheral device
- * @offset: the GPIO pin offset from the GPIO controller
- * @return: 0 on success, or negative error code on failure
- */
- int pinctrl_gpio_request(struct udevice *dev, unsigned offset)
- {
- const struct pinctrl_ops *ops;
- struct udevice *pctldev;
- unsigned int pin_selector;
- int ret;
- ret = pinctrl_gpio_get_pinctrl_and_offset(dev, offset,
- &pctldev, &pin_selector);
- if (ret)
- return ret;
- ops = pinctrl_get_ops(pctldev);
- assert(ops);
- if (!ops->gpio_request_enable)
- return -ENOSYS;
- return ops->gpio_request_enable(pctldev, pin_selector);
- }
- /**
- * pinctrl_gpio_free() - free a single pin used as GPIO
- *
- * @dev: GPIO peripheral device
- * @offset: the GPIO pin offset from the GPIO controller
- * @return: 0 on success, or negative error code on failure
- */
- int pinctrl_gpio_free(struct udevice *dev, unsigned offset)
- {
- const struct pinctrl_ops *ops;
- struct udevice *pctldev;
- unsigned int pin_selector;
- int ret;
- ret = pinctrl_gpio_get_pinctrl_and_offset(dev, offset,
- &pctldev, &pin_selector);
- if (ret)
- return ret;
- ops = pinctrl_get_ops(pctldev);
- assert(ops);
- if (!ops->gpio_disable_free)
- return -ENOSYS;
- return ops->gpio_disable_free(pctldev, pin_selector);
- }
- /**
- * pinctrl_select_state_simple() - simple implementation of pinctrl_select_state
- *
- * @dev: peripheral device
- * @return: 0 on success, or negative error code on failure
- */
- static int pinctrl_select_state_simple(struct udevice *dev)
- {
- struct udevice *pctldev;
- struct pinctrl_ops *ops;
- int ret;
- /*
- * For most system, there is only one pincontroller device. But in
- * case of multiple pincontroller devices, probe the one with sequence
- * number 0 (defined by alias) to avoid race condition.
- */
- ret = uclass_get_device_by_seq(UCLASS_PINCTRL, 0, &pctldev);
- if (ret)
- /* if not found, get the first one */
- ret = uclass_get_device(UCLASS_PINCTRL, 0, &pctldev);
- if (ret)
- return ret;
- ops = pinctrl_get_ops(pctldev);
- if (!ops->set_state_simple) {
- dev_dbg(dev, "set_state_simple op missing\n");
- return -ENOSYS;
- }
- return ops->set_state_simple(pctldev, dev);
- }
- int pinctrl_select_state(struct udevice *dev, const char *statename)
- {
- /*
- * Some device which is logical like mmc.blk, do not have
- * a valid ofnode.
- */
- if (!dev_has_ofnode(dev))
- return 0;
- /*
- * Try full-implemented pinctrl first.
- * If it fails or is not implemented, try simple one.
- */
- if (pinctrl_select_state_full(dev, statename))
- return pinctrl_select_state_simple(dev);
- return 0;
- }
- int pinctrl_request(struct udevice *dev, int func, int flags)
- {
- struct pinctrl_ops *ops = pinctrl_get_ops(dev);
- if (!ops->request)
- return -ENOSYS;
- return ops->request(dev, func, flags);
- }
- int pinctrl_request_noflags(struct udevice *dev, int func)
- {
- return pinctrl_request(dev, func, 0);
- }
- int pinctrl_get_periph_id(struct udevice *dev, struct udevice *periph)
- {
- struct pinctrl_ops *ops = pinctrl_get_ops(dev);
- if (!ops->get_periph_id)
- return -ENOSYS;
- return ops->get_periph_id(dev, periph);
- }
- int pinctrl_get_gpio_mux(struct udevice *dev, int banknum, int index)
- {
- struct pinctrl_ops *ops = pinctrl_get_ops(dev);
- if (!ops->get_gpio_mux)
- return -ENOSYS;
- return ops->get_gpio_mux(dev, banknum, index);
- }
- int pinctrl_get_pins_count(struct udevice *dev)
- {
- struct pinctrl_ops *ops = pinctrl_get_ops(dev);
- if (!ops->get_pins_count)
- return -ENOSYS;
- return ops->get_pins_count(dev);
- }
- int pinctrl_get_pin_name(struct udevice *dev, int selector, char *buf,
- int size)
- {
- struct pinctrl_ops *ops = pinctrl_get_ops(dev);
- if (!ops->get_pin_name)
- return -ENOSYS;
- snprintf(buf, size, ops->get_pin_name(dev, selector));
- return 0;
- }
- int pinctrl_get_pin_muxing(struct udevice *dev, int selector, char *buf,
- int size)
- {
- struct pinctrl_ops *ops = pinctrl_get_ops(dev);
- if (!ops->get_pin_muxing)
- return -ENOSYS;
- return ops->get_pin_muxing(dev, selector, buf, size);
- }
- /**
- * pinconfig_post_bind() - post binding for PINCTRL uclass
- * Recursively bind child nodes as pinconfig devices in case of full pinctrl.
- *
- * @dev: pinctrl device
- * @return: 0 on success, or negative error code on failure
- */
- static int __maybe_unused pinctrl_post_bind(struct udevice *dev)
- {
- const struct pinctrl_ops *ops = pinctrl_get_ops(dev);
- if (!ops) {
- dev_dbg(dev, "ops is not set. Do not bind.\n");
- return -EINVAL;
- }
- /*
- * If set_state callback is set, we assume this pinctrl driver is the
- * full implementation. In this case, its child nodes should be bound
- * so that peripheral devices can easily search in parent devices
- * during later DT-parsing.
- */
- if (ops->set_state)
- return pinconfig_post_bind(dev);
- return 0;
- }
- UCLASS_DRIVER(pinctrl) = {
- .id = UCLASS_PINCTRL,
- #if !CONFIG_IS_ENABLED(OF_PLATDATA)
- .post_bind = pinctrl_post_bind,
- #endif
- .flags = DM_UC_FLAG_SEQ_ALIAS,
- .name = "pinctrl",
- };
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