/* * Copyright (C) 2015 Masahiro Yamada * * SPDX-License-Identifier: GPL-2.0+ */ #include #include #include #include #include #include #include #include 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(dev); 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_stringlist_search(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(dev); 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 && !dm_fdt_pre_reloc(fdt, offset)) 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, .flags = DM_UC_FLAG_SEQ_ALIAS, .name = "pinctrl", };