mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-12 06:06:15 +09:00
83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
280 lines
6.2 KiB
C
280 lines
6.2 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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int pinctrl_decode_pin_config(const void *blob, int node)
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{
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int flags = 0;
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if (fdtdec_get_bool(blob, node, "bias-pull-up"))
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flags |= 1 << PIN_CONFIG_BIAS_PULL_UP;
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else if (fdtdec_get_bool(blob, node, "bias-pull-down"))
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flags |= 1 << PIN_CONFIG_BIAS_PULL_DOWN;
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return flags;
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}
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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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return ret;
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ret = pinctrl_config_one(config);
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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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/**
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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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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 (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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.post_bind = pinconfig_post_bind,
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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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/**
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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 simplicity, assume the first device of PINCTRL uclass
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* is the correct one. This is most likely OK as there is
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* usually only one pinctrl device on the system.
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*/
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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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* 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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/**
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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 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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