| /* |
| * Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.com> |
| * |
| * SPDX-License-Identifier: GPL-2.0+ |
| */ |
| |
| #include <common.h> |
| #include <libfdt.h> |
| #include <linux/err.h> |
| #include <linux/list.h> |
| #include <dm/device.h> |
| #include <dm/lists.h> |
| #include <dm/pinctrl.h> |
| #include <dm/uclass.h> |
| |
| DECLARE_GLOBAL_DATA_PTR; |
| |
| int pinctrl_decode_pin_config(const void *blob, int node) |
| { |
| int flags = 0; |
| |
| if (fdtdec_get_bool(blob, node, "bias-pull-up")) |
| flags |= 1 << PIN_CONFIG_BIAS_PULL_UP; |
| else if (fdtdec_get_bool(blob, node, "bias-pull-down")) |
| flags |= 1 << PIN_CONFIG_BIAS_PULL_DOWN; |
| |
| return flags; |
| } |
| |
| #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) |
| { |
| const void *fdt = gd->fdt_blob; |
| int node = dev->of_offset; |
| char propname[32]; /* long enough */ |
| const fdt32_t *list; |
| uint32_t phandle; |
| int config_node; |
| struct udevice *config; |
| int state, size, i, ret; |
| |
| state = fdt_find_string(fdt, node, "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 = simple_strtoul(statename, &end, 10); |
| if (*end) |
| return -EINVAL; |
| } |
| |
| snprintf(propname, sizeof(propname), "pinctrl-%d", state); |
| list = fdt_getprop(fdt, node, propname, &size); |
| if (!list) |
| return -EINVAL; |
| |
| size /= sizeof(*list); |
| for (i = 0; i < size; i++) { |
| phandle = fdt32_to_cpu(*list++); |
| |
| config_node = fdt_node_offset_by_phandle(fdt, phandle); |
| if (config_node < 0) { |
| dev_err(dev, "prop %s index %d invalid phandle\n", |
| propname, i); |
| return -EINVAL; |
| } |
| ret = uclass_get_device_by_of_offset(UCLASS_PINCONFIG, |
| config_node, &config); |
| if (ret) |
| return ret; |
| |
| ret = pinctrl_config_one(config); |
| if (ret) |
| return ret; |
| } |
| |
| 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) |
| { |
| const void *fdt = gd->fdt_blob; |
| int offset = dev->of_offset; |
| bool pre_reloc_only = !(gd->flags & GD_FLG_RELOC); |
| const char *name; |
| int ret; |
| |
| for (offset = fdt_first_subnode(fdt, offset); |
| offset > 0; |
| offset = fdt_next_subnode(fdt, offset)) { |
| if (pre_reloc_only && |
| !fdt_getprop(fdt, offset, "u-boot,dm-pre-reloc", NULL)) |
| continue; |
| /* |
| * If this node has "compatible" property, this is not |
| * a pin configuration node, but a normal device. skip. |
| */ |
| fdt_get_property(fdt, offset, "compatible", &ret); |
| if (ret >= 0) |
| continue; |
| |
| if (ret != -FDT_ERR_NOTFOUND) |
| return ret; |
| |
| name = fdt_get_name(fdt, offset, NULL); |
| if (!name) |
| return -EINVAL; |
| ret = device_bind_driver_to_node(dev, "pinconfig", name, |
| offset, NULL); |
| if (ret) |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| UCLASS_DRIVER(pinconfig) = { |
| .id = UCLASS_PINCONFIG, |
| .post_bind = pinconfig_post_bind, |
| .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 |
| |
| /** |
| * 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 simplicity, assume the first device of PINCTRL uclass |
| * is the correct one. This is most likely OK as there is |
| * usually only one pinctrl device on the system. |
| */ |
| 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) |
| { |
| /* |
| * 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); |
| } |
| |
| /** |
| * 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 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, |
| .post_bind = pinctrl_post_bind, |
| .name = "pinctrl", |
| }; |