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 <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 16 DECLARE_GLOBAL_DATA_PTR; 17 18 int pinctrl_decode_pin_config(const void *blob, int node) 19 { 20 int flags = 0; 21 22 if (fdtdec_get_bool(blob, node, "bias-pull-up")) 23 flags |= 1 << PIN_CONFIG_BIAS_PULL_UP; 24 else if (fdtdec_get_bool(blob, node, "bias-pull-down")) 25 flags |= 1 << PIN_CONFIG_BIAS_PULL_DOWN; 26 27 return flags; 28 } 29 30 #if CONFIG_IS_ENABLED(PINCTRL_FULL) 31 /** 32 * pinctrl_config_one() - apply pinctrl settings for a single node 33 * 34 * @config: pin configuration node 35 * @return: 0 on success, or negative error code on failure 36 */ 37 static int pinctrl_config_one(struct udevice *config) 38 { 39 struct udevice *pctldev; 40 const struct pinctrl_ops *ops; 41 42 pctldev = config; 43 for (;;) { 44 pctldev = dev_get_parent(pctldev); 45 if (!pctldev) { 46 dev_err(config, "could not find pctldev\n"); 47 return -EINVAL; 48 } 49 if (pctldev->uclass->uc_drv->id == UCLASS_PINCTRL) 50 break; 51 } 52 53 ops = pinctrl_get_ops(pctldev); 54 return ops->set_state(pctldev, config); 55 } 56 57 /** 58 * pinctrl_select_state_full() - full implementation of pinctrl_select_state 59 * 60 * @dev: peripheral device 61 * @statename: state name, like "default" 62 * @return: 0 on success, or negative error code on failure 63 */ 64 static int pinctrl_select_state_full(struct udevice *dev, const char *statename) 65 { 66 const void *fdt = gd->fdt_blob; 67 int node = dev_of_offset(dev); 68 char propname[32]; /* long enough */ 69 const fdt32_t *list; 70 uint32_t phandle; 71 int config_node; 72 struct udevice *config; 73 int state, size, i, ret; 74 75 state = fdt_stringlist_search(fdt, node, "pinctrl-names", statename); 76 if (state < 0) { 77 char *end; 78 /* 79 * If statename is not found in "pinctrl-names", 80 * assume statename is just the integer state ID. 81 */ 82 state = simple_strtoul(statename, &end, 10); 83 if (*end) 84 return -EINVAL; 85 } 86 87 snprintf(propname, sizeof(propname), "pinctrl-%d", state); 88 list = fdt_getprop(fdt, node, propname, &size); 89 if (!list) 90 return -EINVAL; 91 92 size /= sizeof(*list); 93 for (i = 0; i < size; i++) { 94 phandle = fdt32_to_cpu(*list++); 95 96 config_node = fdt_node_offset_by_phandle(fdt, phandle); 97 if (config_node < 0) { 98 dev_err(dev, "prop %s index %d invalid phandle\n", 99 propname, i); 100 return -EINVAL; 101 } 102 ret = uclass_get_device_by_of_offset(UCLASS_PINCONFIG, 103 config_node, &config); 104 if (ret) 105 return ret; 106 107 ret = pinctrl_config_one(config); 108 if (ret) 109 return ret; 110 } 111 112 return 0; 113 } 114 115 /** 116 * pinconfig_post_bind() - post binding for PINCONFIG uclass 117 * Recursively bind its children as pinconfig devices. 118 * 119 * @dev: pinconfig device 120 * @return: 0 on success, or negative error code on failure 121 */ 122 static int pinconfig_post_bind(struct udevice *dev) 123 { 124 bool pre_reloc_only = !(gd->flags & GD_FLG_RELOC); 125 const char *name; 126 ofnode node; 127 int ret; 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 simplicity, assume the first device of PINCTRL uclass 193 * is the correct one. This is most likely OK as there is 194 * usually only one pinctrl device on the system. 195 */ 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 * Try full-implemented pinctrl first. 213 * If it fails or is not implemented, try simple one. 214 */ 215 if (pinctrl_select_state_full(dev, statename)) 216 return pinctrl_select_state_simple(dev); 217 218 return 0; 219 } 220 221 int pinctrl_request(struct udevice *dev, int func, int flags) 222 { 223 struct pinctrl_ops *ops = pinctrl_get_ops(dev); 224 225 if (!ops->request) 226 return -ENOSYS; 227 228 return ops->request(dev, func, flags); 229 } 230 231 int pinctrl_request_noflags(struct udevice *dev, int func) 232 { 233 return pinctrl_request(dev, func, 0); 234 } 235 236 int pinctrl_get_periph_id(struct udevice *dev, struct udevice *periph) 237 { 238 struct pinctrl_ops *ops = pinctrl_get_ops(dev); 239 240 if (!ops->get_periph_id) 241 return -ENOSYS; 242 243 return ops->get_periph_id(dev, periph); 244 } 245 246 int pinctrl_get_gpio_mux(struct udevice *dev, int banknum, int index) 247 { 248 struct pinctrl_ops *ops = pinctrl_get_ops(dev); 249 250 if (!ops->get_gpio_mux) 251 return -ENOSYS; 252 253 return ops->get_gpio_mux(dev, banknum, index); 254 } 255 256 /** 257 * pinconfig_post_bind() - post binding for PINCTRL uclass 258 * Recursively bind child nodes as pinconfig devices in case of full pinctrl. 259 * 260 * @dev: pinctrl device 261 * @return: 0 on success, or negative error code on failure 262 */ 263 static int pinctrl_post_bind(struct udevice *dev) 264 { 265 const struct pinctrl_ops *ops = pinctrl_get_ops(dev); 266 267 if (!ops) { 268 dev_dbg(dev, "ops is not set. Do not bind.\n"); 269 return -EINVAL; 270 } 271 272 /* 273 * If set_state callback is set, we assume this pinctrl driver is the 274 * full implementation. In this case, its child nodes should be bound 275 * so that peripheral devices can easily search in parent devices 276 * during later DT-parsing. 277 */ 278 if (ops->set_state) 279 return pinconfig_post_bind(dev); 280 281 return 0; 282 } 283 284 UCLASS_DRIVER(pinctrl) = { 285 .id = UCLASS_PINCTRL, 286 .post_bind = pinctrl_post_bind, 287 .flags = DM_UC_FLAG_SEQ_ALIAS, 288 .name = "pinctrl", 289 }; 290