1 /* 2 * Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.com> 3 * 4 * SPDX-License-Identifier: GPL-2.0+ 5 */ 6 7 #include <common.h> 8 #include <linux/libfdt.h> 9 #include <linux/err.h> 10 #include <linux/list.h> 11 #include <dm.h> 12 #include <dm/lists.h> 13 #include <dm/pinctrl.h> 14 #include <dm/util.h> 15 #include <dm/of_access.h> 16 17 DECLARE_GLOBAL_DATA_PTR; 18 19 int pinctrl_decode_pin_config(const void *blob, int node) 20 { 21 int flags = 0; 22 23 if (fdtdec_get_bool(blob, node, "bias-pull-up")) 24 flags |= 1 << PIN_CONFIG_BIAS_PULL_UP; 25 else if (fdtdec_get_bool(blob, node, "bias-pull-down")) 26 flags |= 1 << PIN_CONFIG_BIAS_PULL_DOWN; 27 28 return flags; 29 } 30 31 #if CONFIG_IS_ENABLED(PINCTRL_FULL) 32 /** 33 * pinctrl_config_one() - apply pinctrl settings for a single node 34 * 35 * @config: pin configuration node 36 * @return: 0 on success, or negative error code on failure 37 */ 38 static int pinctrl_config_one(struct udevice *config) 39 { 40 struct udevice *pctldev; 41 const struct pinctrl_ops *ops; 42 43 pctldev = config; 44 for (;;) { 45 pctldev = dev_get_parent(pctldev); 46 if (!pctldev) { 47 dev_err(config, "could not find pctldev\n"); 48 return -EINVAL; 49 } 50 if (pctldev->uclass->uc_drv->id == UCLASS_PINCTRL) 51 break; 52 } 53 54 ops = pinctrl_get_ops(pctldev); 55 return ops->set_state(pctldev, config); 56 } 57 58 /** 59 * pinctrl_select_state_full() - full implementation of pinctrl_select_state 60 * 61 * @dev: peripheral device 62 * @statename: state name, like "default" 63 * @return: 0 on success, or negative error code on failure 64 */ 65 static int pinctrl_select_state_full(struct udevice *dev, const char *statename) 66 { 67 char propname[32]; /* long enough */ 68 const fdt32_t *list; 69 uint32_t phandle; 70 struct udevice *config; 71 int state, size, i, ret; 72 73 state = dev_read_stringlist_search(dev, "pinctrl-names", statename); 74 if (state < 0) { 75 char *end; 76 /* 77 * If statename is not found in "pinctrl-names", 78 * assume statename is just the integer state ID. 79 */ 80 state = simple_strtoul(statename, &end, 10); 81 if (*end) 82 return -EINVAL; 83 } 84 85 snprintf(propname, sizeof(propname), "pinctrl-%d", state); 86 list = dev_read_prop(dev, propname, &size); 87 if (!list) 88 return -EINVAL; 89 90 size /= sizeof(*list); 91 for (i = 0; i < size; i++) { 92 phandle = fdt32_to_cpu(*list++); 93 ret = uclass_get_device_by_phandle_id(UCLASS_PINCONFIG, phandle, 94 &config); 95 if (ret) 96 return ret; 97 98 ret = pinctrl_config_one(config); 99 if (ret) 100 return ret; 101 } 102 103 return 0; 104 } 105 106 /** 107 * pinconfig_post_bind() - post binding for PINCONFIG uclass 108 * Recursively bind its children as pinconfig devices. 109 * 110 * @dev: pinconfig device 111 * @return: 0 on success, or negative error code on failure 112 */ 113 static int pinconfig_post_bind(struct udevice *dev) 114 { 115 bool pre_reloc_only = !(gd->flags & GD_FLG_RELOC); 116 const char *name; 117 ofnode node; 118 int ret; 119 120 dev_for_each_subnode(node, dev) { 121 if (pre_reloc_only && 122 !ofnode_pre_reloc(node)) 123 continue; 124 /* 125 * If this node has "compatible" property, this is not 126 * a pin configuration node, but a normal device. skip. 127 */ 128 ofnode_get_property(node, "compatible", &ret); 129 if (ret >= 0) 130 continue; 131 132 if (ret != -FDT_ERR_NOTFOUND) 133 return ret; 134 135 name = ofnode_get_name(node); 136 if (!name) 137 return -EINVAL; 138 ret = device_bind_driver_to_node(dev, "pinconfig", name, 139 node, NULL); 140 if (ret) 141 return ret; 142 } 143 144 return 0; 145 } 146 147 UCLASS_DRIVER(pinconfig) = { 148 .id = UCLASS_PINCONFIG, 149 .post_bind = pinconfig_post_bind, 150 .name = "pinconfig", 151 }; 152 153 U_BOOT_DRIVER(pinconfig_generic) = { 154 .name = "pinconfig", 155 .id = UCLASS_PINCONFIG, 156 }; 157 158 #else 159 static int pinctrl_select_state_full(struct udevice *dev, const char *statename) 160 { 161 return -ENODEV; 162 } 163 164 static int pinconfig_post_bind(struct udevice *dev) 165 { 166 return 0; 167 } 168 #endif 169 170 /** 171 * pinctrl_select_state_simple() - simple implementation of pinctrl_select_state 172 * 173 * @dev: peripheral device 174 * @return: 0 on success, or negative error code on failure 175 */ 176 static int pinctrl_select_state_simple(struct udevice *dev) 177 { 178 struct udevice *pctldev; 179 struct pinctrl_ops *ops; 180 int ret; 181 182 /* 183 * For simplicity, assume the first device of PINCTRL uclass 184 * is the correct one. This is most likely OK as there is 185 * usually only one pinctrl device on the system. 186 */ 187 ret = uclass_get_device(UCLASS_PINCTRL, 0, &pctldev); 188 if (ret) 189 return ret; 190 191 ops = pinctrl_get_ops(pctldev); 192 if (!ops->set_state_simple) { 193 dev_dbg(dev, "set_state_simple op missing\n"); 194 return -ENOSYS; 195 } 196 197 return ops->set_state_simple(pctldev, dev); 198 } 199 200 int pinctrl_select_state(struct udevice *dev, const char *statename) 201 { 202 /* 203 * Try full-implemented pinctrl first. 204 * If it fails or is not implemented, try simple one. 205 */ 206 if (pinctrl_select_state_full(dev, statename)) 207 return pinctrl_select_state_simple(dev); 208 209 return 0; 210 } 211 212 int pinctrl_request(struct udevice *dev, int func, int flags) 213 { 214 struct pinctrl_ops *ops = pinctrl_get_ops(dev); 215 216 if (!ops->request) 217 return -ENOSYS; 218 219 return ops->request(dev, func, flags); 220 } 221 222 int pinctrl_request_noflags(struct udevice *dev, int func) 223 { 224 return pinctrl_request(dev, func, 0); 225 } 226 227 int pinctrl_get_periph_id(struct udevice *dev, struct udevice *periph) 228 { 229 struct pinctrl_ops *ops = pinctrl_get_ops(dev); 230 231 if (!ops->get_periph_id) 232 return -ENOSYS; 233 234 return ops->get_periph_id(dev, periph); 235 } 236 237 int pinctrl_get_gpio_mux(struct udevice *dev, int banknum, int index) 238 { 239 struct pinctrl_ops *ops = pinctrl_get_ops(dev); 240 241 if (!ops->get_gpio_mux) 242 return -ENOSYS; 243 244 return ops->get_gpio_mux(dev, banknum, index); 245 } 246 247 /** 248 * pinconfig_post_bind() - post binding for PINCTRL uclass 249 * Recursively bind child nodes as pinconfig devices in case of full pinctrl. 250 * 251 * @dev: pinctrl device 252 * @return: 0 on success, or negative error code on failure 253 */ 254 static int pinctrl_post_bind(struct udevice *dev) 255 { 256 const struct pinctrl_ops *ops = pinctrl_get_ops(dev); 257 258 if (!ops) { 259 dev_dbg(dev, "ops is not set. Do not bind.\n"); 260 return -EINVAL; 261 } 262 263 /* 264 * If set_state callback is set, we assume this pinctrl driver is the 265 * full implementation. In this case, its child nodes should be bound 266 * so that peripheral devices can easily search in parent devices 267 * during later DT-parsing. 268 */ 269 if (ops->set_state) 270 return pinconfig_post_bind(dev); 271 272 return 0; 273 } 274 275 UCLASS_DRIVER(pinctrl) = { 276 .id = UCLASS_PINCTRL, 277 .post_bind = pinctrl_post_bind, 278 .flags = DM_UC_FLAG_SEQ_ALIAS, 279 .name = "pinctrl", 280 }; 281