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