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![Patrick Delaunay](/assets/img/avatar_default.png)
Remove the pinctrl_decode_pin_config() API, because this function is unused and not compatible with livetree (it uses fdtdec_get_bool instead of ofnode API). Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com> Reviewed-by: Simon Glass <sjg@chromium.org>
421 lines
9.4 KiB
C
421 lines
9.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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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 <linux/libfdt.h>
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#include <linux/err.h>
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#include <linux/list.h>
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#include <dm.h>
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#include <dm/lists.h>
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#include <dm/pinctrl.h>
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#include <dm/util.h>
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#include <dm/of_access.h>
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DECLARE_GLOBAL_DATA_PTR;
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#if CONFIG_IS_ENABLED(PINCTRL_FULL)
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/**
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* pinctrl_config_one() - apply pinctrl settings for a single node
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*
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* @config: pin configuration node
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* @return: 0 on success, or negative error code on failure
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*/
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static int pinctrl_config_one(struct udevice *config)
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{
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struct udevice *pctldev;
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const struct pinctrl_ops *ops;
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pctldev = config;
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for (;;) {
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pctldev = dev_get_parent(pctldev);
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if (!pctldev) {
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dev_err(config, "could not find pctldev\n");
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return -EINVAL;
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}
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if (pctldev->uclass->uc_drv->id == UCLASS_PINCTRL)
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break;
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}
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ops = pinctrl_get_ops(pctldev);
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return ops->set_state(pctldev, config);
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}
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/**
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* pinctrl_select_state_full() - full implementation of pinctrl_select_state
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*
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* @dev: peripheral device
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* @statename: state name, like "default"
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* @return: 0 on success, or negative error code on failure
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*/
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static int pinctrl_select_state_full(struct udevice *dev, const char *statename)
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{
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char propname[32]; /* long enough */
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const fdt32_t *list;
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uint32_t phandle;
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struct udevice *config;
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int state, size, i, ret;
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state = dev_read_stringlist_search(dev, "pinctrl-names", statename);
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if (state < 0) {
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char *end;
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/*
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* If statename is not found in "pinctrl-names",
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* assume statename is just the integer state ID.
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*/
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state = simple_strtoul(statename, &end, 10);
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if (*end)
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return -EINVAL;
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}
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snprintf(propname, sizeof(propname), "pinctrl-%d", state);
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list = dev_read_prop(dev, propname, &size);
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if (!list)
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return -EINVAL;
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size /= sizeof(*list);
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for (i = 0; i < size; i++) {
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phandle = fdt32_to_cpu(*list++);
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ret = uclass_get_device_by_phandle_id(UCLASS_PINCONFIG, phandle,
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&config);
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if (ret) {
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dev_warn(dev, "%s: uclass_get_device_by_phandle_id: err=%d\n",
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__func__, ret);
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continue;
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}
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ret = pinctrl_config_one(config);
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if (ret) {
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dev_warn(dev, "%s: pinctrl_config_one: err=%d\n",
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__func__, ret);
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continue;
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}
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}
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return 0;
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}
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/**
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* pinconfig_post_bind() - post binding for PINCONFIG uclass
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* Recursively bind its children as pinconfig devices.
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*
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* @dev: pinconfig device
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* @return: 0 on success, or negative error code on failure
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*/
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static int pinconfig_post_bind(struct udevice *dev)
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{
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bool pre_reloc_only = !(gd->flags & GD_FLG_RELOC);
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const char *name;
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ofnode node;
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int ret;
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if (!dev_of_valid(dev))
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return 0;
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dev_for_each_subnode(node, dev) {
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if (pre_reloc_only &&
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!ofnode_pre_reloc(node))
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continue;
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/*
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* If this node has "compatible" property, this is not
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* a pin configuration node, but a normal device. skip.
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*/
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ofnode_get_property(node, "compatible", &ret);
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if (ret >= 0)
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continue;
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/* If this node has "gpio-controller" property, skip */
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if (ofnode_read_bool(node, "gpio-controller"))
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continue;
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if (ret != -FDT_ERR_NOTFOUND)
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return ret;
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name = ofnode_get_name(node);
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if (!name)
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return -EINVAL;
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ret = device_bind_driver_to_node(dev, "pinconfig", name,
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node, NULL);
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if (ret)
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return ret;
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}
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return 0;
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}
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UCLASS_DRIVER(pinconfig) = {
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.id = UCLASS_PINCONFIG,
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#if CONFIG_IS_ENABLED(PINCONF_RECURSIVE)
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.post_bind = pinconfig_post_bind,
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#endif
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.name = "pinconfig",
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};
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U_BOOT_DRIVER(pinconfig_generic) = {
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.name = "pinconfig",
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.id = UCLASS_PINCONFIG,
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};
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#else
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static int pinctrl_select_state_full(struct udevice *dev, const char *statename)
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{
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return -ENODEV;
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}
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static int pinconfig_post_bind(struct udevice *dev)
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{
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return 0;
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}
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#endif
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static int
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pinctrl_gpio_get_pinctrl_and_offset(struct udevice *dev, unsigned offset,
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struct udevice **pctldev,
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unsigned int *pin_selector)
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{
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struct ofnode_phandle_args args;
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unsigned gpio_offset, pfc_base, pfc_pins;
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int ret;
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ret = dev_read_phandle_with_args(dev, "gpio-ranges", NULL, 3,
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0, &args);
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if (ret) {
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dev_dbg(dev, "%s: dev_read_phandle_with_args: err=%d\n",
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__func__, ret);
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return ret;
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}
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ret = uclass_get_device_by_ofnode(UCLASS_PINCTRL,
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args.node, pctldev);
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if (ret) {
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dev_dbg(dev,
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"%s: uclass_get_device_by_of_offset failed: err=%d\n",
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__func__, ret);
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return ret;
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}
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gpio_offset = args.args[0];
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pfc_base = args.args[1];
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pfc_pins = args.args[2];
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if (offset < gpio_offset || offset > gpio_offset + pfc_pins) {
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dev_dbg(dev,
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"%s: GPIO can not be mapped to pincontrol pin\n",
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__func__);
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return -EINVAL;
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}
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offset -= gpio_offset;
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offset += pfc_base;
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*pin_selector = offset;
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return 0;
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}
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/**
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* pinctrl_gpio_request() - request a single pin to be used as GPIO
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*
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* @dev: GPIO peripheral device
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* @offset: the GPIO pin offset from the GPIO controller
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* @return: 0 on success, or negative error code on failure
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*/
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int pinctrl_gpio_request(struct udevice *dev, unsigned offset)
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{
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const struct pinctrl_ops *ops;
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struct udevice *pctldev;
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unsigned int pin_selector;
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int ret;
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ret = pinctrl_gpio_get_pinctrl_and_offset(dev, offset,
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&pctldev, &pin_selector);
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if (ret)
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return ret;
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ops = pinctrl_get_ops(pctldev);
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if (!ops || !ops->gpio_request_enable)
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return -ENOTSUPP;
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return ops->gpio_request_enable(pctldev, pin_selector);
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}
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/**
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* pinctrl_gpio_free() - free a single pin used as GPIO
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*
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* @dev: GPIO peripheral device
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* @offset: the GPIO pin offset from the GPIO controller
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* @return: 0 on success, or negative error code on failure
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*/
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int pinctrl_gpio_free(struct udevice *dev, unsigned offset)
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{
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const struct pinctrl_ops *ops;
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struct udevice *pctldev;
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unsigned int pin_selector;
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int ret;
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ret = pinctrl_gpio_get_pinctrl_and_offset(dev, offset,
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&pctldev, &pin_selector);
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if (ret)
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return ret;
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ops = pinctrl_get_ops(pctldev);
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if (!ops || !ops->gpio_disable_free)
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return -ENOTSUPP;
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return ops->gpio_disable_free(pctldev, pin_selector);
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}
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/**
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* pinctrl_select_state_simple() - simple implementation of pinctrl_select_state
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*
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* @dev: peripheral device
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* @return: 0 on success, or negative error code on failure
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*/
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static int pinctrl_select_state_simple(struct udevice *dev)
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{
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struct udevice *pctldev;
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struct pinctrl_ops *ops;
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int ret;
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/*
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* For most system, there is only one pincontroller device. But in
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* case of multiple pincontroller devices, probe the one with sequence
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* number 0 (defined by alias) to avoid race condition.
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*/
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ret = uclass_get_device_by_seq(UCLASS_PINCTRL, 0, &pctldev);
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if (ret)
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/* if not found, get the first one */
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ret = uclass_get_device(UCLASS_PINCTRL, 0, &pctldev);
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if (ret)
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return ret;
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ops = pinctrl_get_ops(pctldev);
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if (!ops->set_state_simple) {
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dev_dbg(dev, "set_state_simple op missing\n");
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return -ENOSYS;
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}
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return ops->set_state_simple(pctldev, dev);
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}
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int pinctrl_select_state(struct udevice *dev, const char *statename)
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{
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/*
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* Some device which is logical like mmc.blk, do not have
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* a valid ofnode.
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*/
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if (!ofnode_valid(dev->node))
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return 0;
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/*
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* Try full-implemented pinctrl first.
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* If it fails or is not implemented, try simple one.
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*/
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if (pinctrl_select_state_full(dev, statename))
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return pinctrl_select_state_simple(dev);
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return 0;
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}
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int pinctrl_request(struct udevice *dev, int func, int flags)
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{
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struct pinctrl_ops *ops = pinctrl_get_ops(dev);
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if (!ops->request)
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return -ENOSYS;
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return ops->request(dev, func, flags);
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}
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int pinctrl_request_noflags(struct udevice *dev, int func)
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{
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return pinctrl_request(dev, func, 0);
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}
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int pinctrl_get_periph_id(struct udevice *dev, struct udevice *periph)
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{
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struct pinctrl_ops *ops = pinctrl_get_ops(dev);
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if (!ops->get_periph_id)
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return -ENOSYS;
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return ops->get_periph_id(dev, periph);
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}
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int pinctrl_get_gpio_mux(struct udevice *dev, int banknum, int index)
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{
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struct pinctrl_ops *ops = pinctrl_get_ops(dev);
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if (!ops->get_gpio_mux)
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return -ENOSYS;
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return ops->get_gpio_mux(dev, banknum, index);
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}
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int pinctrl_get_pins_count(struct udevice *dev)
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{
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struct pinctrl_ops *ops = pinctrl_get_ops(dev);
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if (!ops->get_pins_count)
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return -ENOSYS;
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return ops->get_pins_count(dev);
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}
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int pinctrl_get_pin_name(struct udevice *dev, int selector, char *buf,
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int size)
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{
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struct pinctrl_ops *ops = pinctrl_get_ops(dev);
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if (!ops->get_pin_name)
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return -ENOSYS;
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snprintf(buf, size, ops->get_pin_name(dev, selector));
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return 0;
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}
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int pinctrl_get_pin_muxing(struct udevice *dev, int selector, char *buf,
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int size)
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{
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struct pinctrl_ops *ops = pinctrl_get_ops(dev);
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if (!ops->get_pin_muxing)
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return -ENOSYS;
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return ops->get_pin_muxing(dev, selector, buf, size);
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}
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/**
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* pinconfig_post_bind() - post binding for PINCTRL uclass
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* Recursively bind child nodes as pinconfig devices in case of full pinctrl.
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*
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* @dev: pinctrl device
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* @return: 0 on success, or negative error code on failure
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*/
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static int __maybe_unused pinctrl_post_bind(struct udevice *dev)
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{
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const struct pinctrl_ops *ops = pinctrl_get_ops(dev);
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if (!ops) {
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dev_dbg(dev, "ops is not set. Do not bind.\n");
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return -EINVAL;
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}
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/*
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* If set_state callback is set, we assume this pinctrl driver is the
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* full implementation. In this case, its child nodes should be bound
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* so that peripheral devices can easily search in parent devices
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* during later DT-parsing.
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*/
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if (ops->set_state)
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return pinconfig_post_bind(dev);
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return 0;
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}
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UCLASS_DRIVER(pinctrl) = {
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.id = UCLASS_PINCTRL,
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.post_bind = pinctrl_post_bind,
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.flags = DM_UC_FLAG_SEQ_ALIAS,
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.name = "pinctrl",
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};
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