1 /* 2 * Marvell Berlin SoC pinctrl core driver 3 * 4 * Copyright (C) 2014 Marvell Technology Group Ltd. 5 * 6 * Antoine Ténart <antoine.tenart@free-electrons.com> 7 * 8 * This file is licensed under the terms of the GNU General Public 9 * License version 2. This program is licensed "as is" without any 10 * warranty of any kind, whether express or implied. 11 */ 12 13 #include <linux/io.h> 14 #include <linux/mfd/syscon.h> 15 #include <linux/module.h> 16 #include <linux/of.h> 17 #include <linux/of_address.h> 18 #include <linux/of_device.h> 19 #include <linux/pinctrl/pinctrl.h> 20 #include <linux/pinctrl/pinmux.h> 21 #include <linux/platform_device.h> 22 #include <linux/regmap.h> 23 #include <linux/slab.h> 24 25 #include "../core.h" 26 #include "../pinctrl-utils.h" 27 #include "berlin.h" 28 29 struct berlin_pinctrl { 30 struct regmap *regmap; 31 struct device *dev; 32 const struct berlin_pinctrl_desc *desc; 33 struct berlin_pinctrl_function *functions; 34 unsigned nfunctions; 35 struct pinctrl_dev *pctrl_dev; 36 }; 37 38 static int berlin_pinctrl_get_group_count(struct pinctrl_dev *pctrl_dev) 39 { 40 struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev); 41 42 return pctrl->desc->ngroups; 43 } 44 45 static const char *berlin_pinctrl_get_group_name(struct pinctrl_dev *pctrl_dev, 46 unsigned group) 47 { 48 struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev); 49 50 return pctrl->desc->groups[group].name; 51 } 52 53 static int berlin_pinctrl_dt_node_to_map(struct pinctrl_dev *pctrl_dev, 54 struct device_node *node, 55 struct pinctrl_map **map, 56 unsigned *num_maps) 57 { 58 struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev); 59 struct property *prop; 60 const char *function_name, *group_name; 61 unsigned reserved_maps = 0; 62 int ret, ngroups; 63 64 *map = NULL; 65 *num_maps = 0; 66 67 ret = of_property_read_string(node, "function", &function_name); 68 if (ret) { 69 dev_err(pctrl->dev, 70 "missing function property in node %s\n", 71 node->name); 72 return -EINVAL; 73 } 74 75 ngroups = of_property_count_strings(node, "groups"); 76 if (ngroups < 0) { 77 dev_err(pctrl->dev, 78 "missing groups property in node %s\n", 79 node->name); 80 return -EINVAL; 81 } 82 83 ret = pinctrl_utils_reserve_map(pctrl_dev, map, &reserved_maps, 84 num_maps, ngroups); 85 if (ret) { 86 dev_err(pctrl->dev, "can't reserve map: %d\n", ret); 87 return ret; 88 } 89 90 of_property_for_each_string(node, "groups", prop, group_name) { 91 ret = pinctrl_utils_add_map_mux(pctrl_dev, map, &reserved_maps, 92 num_maps, group_name, 93 function_name); 94 if (ret) { 95 dev_err(pctrl->dev, "can't add map: %d\n", ret); 96 return ret; 97 } 98 } 99 100 return 0; 101 } 102 103 static const struct pinctrl_ops berlin_pinctrl_ops = { 104 .get_groups_count = &berlin_pinctrl_get_group_count, 105 .get_group_name = &berlin_pinctrl_get_group_name, 106 .dt_node_to_map = &berlin_pinctrl_dt_node_to_map, 107 .dt_free_map = &pinctrl_utils_free_map, 108 }; 109 110 static int berlin_pinmux_get_functions_count(struct pinctrl_dev *pctrl_dev) 111 { 112 struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev); 113 114 return pctrl->nfunctions; 115 } 116 117 static const char *berlin_pinmux_get_function_name(struct pinctrl_dev *pctrl_dev, 118 unsigned function) 119 { 120 struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev); 121 122 return pctrl->functions[function].name; 123 } 124 125 static int berlin_pinmux_get_function_groups(struct pinctrl_dev *pctrl_dev, 126 unsigned function, 127 const char * const **groups, 128 unsigned * const num_groups) 129 { 130 struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev); 131 132 *groups = pctrl->functions[function].groups; 133 *num_groups = pctrl->functions[function].ngroups; 134 135 return 0; 136 } 137 138 static struct berlin_desc_function * 139 berlin_pinctrl_find_function_by_name(struct berlin_pinctrl *pctrl, 140 const struct berlin_desc_group *group, 141 const char *fname) 142 { 143 struct berlin_desc_function *function = group->functions; 144 145 while (function->name) { 146 if (!strcmp(function->name, fname)) 147 return function; 148 149 function++; 150 } 151 152 return NULL; 153 } 154 155 static int berlin_pinmux_set(struct pinctrl_dev *pctrl_dev, 156 unsigned function, 157 unsigned group) 158 { 159 struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev); 160 const struct berlin_desc_group *group_desc = pctrl->desc->groups + group; 161 struct berlin_pinctrl_function *func = pctrl->functions + function; 162 struct berlin_desc_function *function_desc = 163 berlin_pinctrl_find_function_by_name(pctrl, group_desc, 164 func->name); 165 u32 mask, val; 166 167 if (!function_desc) 168 return -EINVAL; 169 170 mask = GENMASK(group_desc->lsb + group_desc->bit_width - 1, 171 group_desc->lsb); 172 val = function_desc->muxval << group_desc->lsb; 173 regmap_update_bits(pctrl->regmap, group_desc->offset, mask, val); 174 175 return 0; 176 } 177 178 static const struct pinmux_ops berlin_pinmux_ops = { 179 .get_functions_count = &berlin_pinmux_get_functions_count, 180 .get_function_name = &berlin_pinmux_get_function_name, 181 .get_function_groups = &berlin_pinmux_get_function_groups, 182 .set_mux = &berlin_pinmux_set, 183 }; 184 185 static int berlin_pinctrl_add_function(struct berlin_pinctrl *pctrl, 186 const char *name) 187 { 188 struct berlin_pinctrl_function *function = pctrl->functions; 189 190 while (function->name) { 191 if (!strcmp(function->name, name)) { 192 function->ngroups++; 193 return -EEXIST; 194 } 195 function++; 196 } 197 198 function->name = name; 199 function->ngroups = 1; 200 201 pctrl->nfunctions++; 202 203 return 0; 204 } 205 206 static int berlin_pinctrl_build_state(struct platform_device *pdev) 207 { 208 struct berlin_pinctrl *pctrl = platform_get_drvdata(pdev); 209 struct berlin_desc_group const *desc_group; 210 struct berlin_desc_function const *desc_function; 211 int i, max_functions = 0; 212 213 pctrl->nfunctions = 0; 214 215 for (i = 0; i < pctrl->desc->ngroups; i++) { 216 desc_group = pctrl->desc->groups + i; 217 /* compute the maxiumum number of functions a group can have */ 218 max_functions += 1 << (desc_group->bit_width + 1); 219 } 220 221 /* we will reallocate later */ 222 pctrl->functions = devm_kzalloc(&pdev->dev, 223 max_functions * sizeof(*pctrl->functions), 224 GFP_KERNEL); 225 if (!pctrl->functions) 226 return -ENOMEM; 227 228 /* register all functions */ 229 for (i = 0; i < pctrl->desc->ngroups; i++) { 230 desc_group = pctrl->desc->groups + i; 231 desc_function = desc_group->functions; 232 233 while (desc_function->name) { 234 berlin_pinctrl_add_function(pctrl, desc_function->name); 235 desc_function++; 236 } 237 } 238 239 pctrl->functions = krealloc(pctrl->functions, 240 pctrl->nfunctions * sizeof(*pctrl->functions), 241 GFP_KERNEL); 242 243 /* map functions to theirs groups */ 244 for (i = 0; i < pctrl->desc->ngroups; i++) { 245 desc_group = pctrl->desc->groups + i; 246 desc_function = desc_group->functions; 247 248 while (desc_function->name) { 249 struct berlin_pinctrl_function 250 *function = pctrl->functions; 251 const char **groups; 252 bool found = false; 253 254 while (function->name) { 255 if (!strcmp(desc_function->name, function->name)) { 256 found = true; 257 break; 258 } 259 function++; 260 } 261 262 if (!found) 263 return -EINVAL; 264 265 if (!function->groups) { 266 function->groups = 267 devm_kzalloc(&pdev->dev, 268 function->ngroups * sizeof(char *), 269 GFP_KERNEL); 270 271 if (!function->groups) 272 return -ENOMEM; 273 } 274 275 groups = function->groups; 276 while (*groups) 277 groups++; 278 279 *groups = desc_group->name; 280 281 desc_function++; 282 } 283 } 284 285 return 0; 286 } 287 288 static struct pinctrl_desc berlin_pctrl_desc = { 289 .name = "berlin-pinctrl", 290 .pctlops = &berlin_pinctrl_ops, 291 .pmxops = &berlin_pinmux_ops, 292 .owner = THIS_MODULE, 293 }; 294 295 int berlin_pinctrl_probe_regmap(struct platform_device *pdev, 296 const struct berlin_pinctrl_desc *desc, 297 struct regmap *regmap) 298 { 299 struct device *dev = &pdev->dev; 300 struct berlin_pinctrl *pctrl; 301 int ret; 302 303 pctrl = devm_kzalloc(dev, sizeof(*pctrl), GFP_KERNEL); 304 if (!pctrl) 305 return -ENOMEM; 306 307 platform_set_drvdata(pdev, pctrl); 308 309 pctrl->regmap = regmap; 310 pctrl->dev = &pdev->dev; 311 pctrl->desc = desc; 312 313 ret = berlin_pinctrl_build_state(pdev); 314 if (ret) { 315 dev_err(dev, "cannot build driver state: %d\n", ret); 316 return ret; 317 } 318 319 pctrl->pctrl_dev = devm_pinctrl_register(dev, &berlin_pctrl_desc, 320 pctrl); 321 if (IS_ERR(pctrl->pctrl_dev)) { 322 dev_err(dev, "failed to register pinctrl driver\n"); 323 return PTR_ERR(pctrl->pctrl_dev); 324 } 325 326 return 0; 327 } 328 329 int berlin_pinctrl_probe(struct platform_device *pdev, 330 const struct berlin_pinctrl_desc *desc) 331 { 332 struct device *dev = &pdev->dev; 333 struct device_node *parent_np = of_get_parent(dev->of_node); 334 struct regmap *regmap = syscon_node_to_regmap(parent_np); 335 336 of_node_put(parent_np); 337 if (IS_ERR(regmap)) 338 return PTR_ERR(regmap); 339 340 return berlin_pinctrl_probe_regmap(pdev, desc, regmap); 341 } 342