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 dev_warn(dev, "%s: uclass_get_device_by_phandle_id: err=%d\n", 97 __func__, ret); 98 continue; 99 } 100 101 ret = pinctrl_config_one(config); 102 if (ret) { 103 dev_warn(dev, "%s: pinctrl_config_one: err=%d\n", 104 __func__, ret); 105 continue; 106 } 107 } 108 109 return 0; 110 } 111 112 /** 113 * pinconfig_post_bind() - post binding for PINCONFIG uclass 114 * Recursively bind its children as pinconfig devices. 115 * 116 * @dev: pinconfig device 117 * @return: 0 on success, or negative error code on failure 118 */ 119 static int pinconfig_post_bind(struct udevice *dev) 120 { 121 bool pre_reloc_only = !(gd->flags & GD_FLG_RELOC); 122 const char *name; 123 ofnode node; 124 int ret; 125 126 if (!dev_of_valid(dev)) 127 return 0; 128 129 dev_for_each_subnode(node, dev) { 130 if (pre_reloc_only && 131 !ofnode_pre_reloc(node)) 132 continue; 133 /* 134 * If this node has "compatible" property, this is not 135 * a pin configuration node, but a normal device. skip. 136 */ 137 ofnode_get_property(node, "compatible", &ret); 138 if (ret >= 0) 139 continue; 140 141 if (ret != -FDT_ERR_NOTFOUND) 142 return ret; 143 144 name = ofnode_get_name(node); 145 if (!name) 146 return -EINVAL; 147 ret = device_bind_driver_to_node(dev, "pinconfig", name, 148 node, NULL); 149 if (ret) 150 return ret; 151 } 152 153 return 0; 154 } 155 156 UCLASS_DRIVER(pinconfig) = { 157 .id = UCLASS_PINCONFIG, 158 .post_bind = pinconfig_post_bind, 159 .name = "pinconfig", 160 }; 161 162 U_BOOT_DRIVER(pinconfig_generic) = { 163 .name = "pinconfig", 164 .id = UCLASS_PINCONFIG, 165 }; 166 167 #else 168 static int pinctrl_select_state_full(struct udevice *dev, const char *statename) 169 { 170 return -ENODEV; 171 } 172 173 static int pinconfig_post_bind(struct udevice *dev) 174 { 175 return 0; 176 } 177 #endif 178 179 /** 180 * pinctrl_select_state_simple() - simple implementation of pinctrl_select_state 181 * 182 * @dev: peripheral device 183 * @return: 0 on success, or negative error code on failure 184 */ 185 static int pinctrl_select_state_simple(struct udevice *dev) 186 { 187 struct udevice *pctldev; 188 struct pinctrl_ops *ops; 189 int ret; 190 191 /* 192 * For most system, there is only one pincontroller device. But in 193 * case of multiple pincontroller devices, probe the one with sequence 194 * number 0 (defined by alias) to avoid race condition. 195 */ 196 ret = uclass_get_device_by_seq(UCLASS_PINCTRL, 0, &pctldev); 197 if (ret) 198 /* if not found, get the first one */ 199 ret = uclass_get_device(UCLASS_PINCTRL, 0, &pctldev); 200 if (ret) 201 return ret; 202 203 ops = pinctrl_get_ops(pctldev); 204 if (!ops->set_state_simple) { 205 dev_dbg(dev, "set_state_simple op missing\n"); 206 return -ENOSYS; 207 } 208 209 return ops->set_state_simple(pctldev, dev); 210 } 211 212 int pinctrl_select_state(struct udevice *dev, const char *statename) 213 { 214 /* 215 * Some device which is logical like mmc.blk, do not have 216 * a valid ofnode. 217 */ 218 if (!ofnode_valid(dev->node)) 219 return 0; 220 /* 221 * Try full-implemented pinctrl first. 222 * If it fails or is not implemented, try simple one. 223 */ 224 if (pinctrl_select_state_full(dev, statename)) 225 return pinctrl_select_state_simple(dev); 226 227 return 0; 228 } 229 230 int pinctrl_request(struct udevice *dev, int func, int flags) 231 { 232 struct pinctrl_ops *ops = pinctrl_get_ops(dev); 233 234 if (!ops->request) 235 return -ENOSYS; 236 237 return ops->request(dev, func, flags); 238 } 239 240 int pinctrl_request_noflags(struct udevice *dev, int func) 241 { 242 return pinctrl_request(dev, func, 0); 243 } 244 245 int pinctrl_get_periph_id(struct udevice *dev, struct udevice *periph) 246 { 247 struct pinctrl_ops *ops = pinctrl_get_ops(dev); 248 249 if (!ops->get_periph_id) 250 return -ENOSYS; 251 252 return ops->get_periph_id(dev, periph); 253 } 254 255 int pinctrl_get_gpio_mux(struct udevice *dev, int banknum, int index) 256 { 257 struct pinctrl_ops *ops = pinctrl_get_ops(dev); 258 259 if (!ops->get_gpio_mux) 260 return -ENOSYS; 261 262 return ops->get_gpio_mux(dev, banknum, index); 263 } 264 265 int pinctrl_get_pins_count(struct udevice *dev) 266 { 267 struct pinctrl_ops *ops = pinctrl_get_ops(dev); 268 269 if (!ops->get_pins_count) 270 return -ENOSYS; 271 272 return ops->get_pins_count(dev); 273 } 274 275 int pinctrl_get_pin_name(struct udevice *dev, int selector, char *buf, 276 int size) 277 { 278 struct pinctrl_ops *ops = pinctrl_get_ops(dev); 279 280 if (!ops->get_pin_name) 281 return -ENOSYS; 282 283 snprintf(buf, size, ops->get_pin_name(dev, selector)); 284 285 return 0; 286 } 287 288 int pinctrl_get_pin_muxing(struct udevice *dev, int selector, char *buf, 289 int size) 290 { 291 struct pinctrl_ops *ops = pinctrl_get_ops(dev); 292 293 if (!ops->get_pin_muxing) 294 return -ENOSYS; 295 296 return ops->get_pin_muxing(dev, selector, buf, size); 297 } 298 299 /** 300 * pinconfig_post_bind() - post binding for PINCTRL uclass 301 * Recursively bind child nodes as pinconfig devices in case of full pinctrl. 302 * 303 * @dev: pinctrl device 304 * @return: 0 on success, or negative error code on failure 305 */ 306 static int pinctrl_post_bind(struct udevice *dev) 307 { 308 const struct pinctrl_ops *ops = pinctrl_get_ops(dev); 309 310 if (!ops) { 311 dev_dbg(dev, "ops is not set. Do not bind.\n"); 312 return -EINVAL; 313 } 314 315 /* 316 * If set_state callback is set, we assume this pinctrl driver is the 317 * full implementation. In this case, its child nodes should be bound 318 * so that peripheral devices can easily search in parent devices 319 * during later DT-parsing. 320 */ 321 if (ops->set_state) 322 return pinconfig_post_bind(dev); 323 324 return 0; 325 } 326 327 UCLASS_DRIVER(pinctrl) = { 328 .id = UCLASS_PINCTRL, 329 .post_bind = pinctrl_post_bind, 330 .flags = DM_UC_FLAG_SEQ_ALIAS, 331 .name = "pinctrl", 332 }; 333