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/module.h> 15 #include <linux/of.h> 16 #include <linux/of_address.h> 17 #include <linux/of_device.h> 18 #include <linux/pinctrl/pinctrl.h> 19 #include <linux/pinctrl/pinmux.h> 20 #include <linux/platform_device.h> 21 #include <linux/regmap.h> 22 #include <linux/slab.h> 23 24 #include "../core.h" 25 #include "../pinctrl-utils.h" 26 #include "berlin.h" 27 28 struct berlin_pinctrl { 29 struct regmap *regmap; 30 struct device *dev; 31 const struct berlin_pinctrl_desc *desc; 32 struct berlin_pinctrl_function *functions; 33 unsigned nfunctions; 34 struct pinctrl_dev *pctrl_dev; 35 }; 36 37 static int berlin_pinctrl_get_group_count(struct pinctrl_dev *pctrl_dev) 38 { 39 struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev); 40 41 return pctrl->desc->ngroups; 42 } 43 44 static const char *berlin_pinctrl_get_group_name(struct pinctrl_dev *pctrl_dev, 45 unsigned group) 46 { 47 struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev); 48 49 return pctrl->desc->groups[group].name; 50 } 51 52 static int berlin_pinctrl_dt_node_to_map(struct pinctrl_dev *pctrl_dev, 53 struct device_node *node, 54 struct pinctrl_map **map, 55 unsigned *num_maps) 56 { 57 struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev); 58 struct property *prop; 59 const char *function_name, *group_name; 60 unsigned reserved_maps = 0; 61 int ret, ngroups; 62 63 *map = NULL; 64 *num_maps = 0; 65 66 ret = of_property_read_string(node, "function", &function_name); 67 if (ret) { 68 dev_err(pctrl->dev, 69 "missing function property in node %s\n", 70 node->name); 71 return -EINVAL; 72 } 73 74 ngroups = of_property_count_strings(node, "groups"); 75 if (ngroups < 0) { 76 dev_err(pctrl->dev, 77 "missing groups property in node %s\n", 78 node->name); 79 return -EINVAL; 80 } 81 82 ret = pinctrl_utils_reserve_map(pctrl_dev, map, &reserved_maps, 83 num_maps, ngroups); 84 if (ret) { 85 dev_err(pctrl->dev, "can't reserve map: %d\n", ret); 86 return ret; 87 } 88 89 of_property_for_each_string(node, "groups", prop, group_name) { 90 ret = pinctrl_utils_add_map_mux(pctrl_dev, map, &reserved_maps, 91 num_maps, group_name, 92 function_name); 93 if (ret) { 94 dev_err(pctrl->dev, "can't add map: %d\n", ret); 95 return ret; 96 } 97 } 98 99 return 0; 100 } 101 102 static const struct pinctrl_ops berlin_pinctrl_ops = { 103 .get_groups_count = &berlin_pinctrl_get_group_count, 104 .get_group_name = &berlin_pinctrl_get_group_name, 105 .dt_node_to_map = &berlin_pinctrl_dt_node_to_map, 106 .dt_free_map = &pinctrl_utils_dt_free_map, 107 }; 108 109 static int berlin_pinmux_get_functions_count(struct pinctrl_dev *pctrl_dev) 110 { 111 struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev); 112 113 return pctrl->nfunctions; 114 } 115 116 static const char *berlin_pinmux_get_function_name(struct pinctrl_dev *pctrl_dev, 117 unsigned function) 118 { 119 struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev); 120 121 return pctrl->functions[function].name; 122 } 123 124 static int berlin_pinmux_get_function_groups(struct pinctrl_dev *pctrl_dev, 125 unsigned function, 126 const char * const **groups, 127 unsigned * const num_groups) 128 { 129 struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev); 130 131 *groups = pctrl->functions[function].groups; 132 *num_groups = pctrl->functions[function].ngroups; 133 134 return 0; 135 } 136 137 static struct berlin_desc_function * 138 berlin_pinctrl_find_function_by_name(struct berlin_pinctrl *pctrl, 139 const struct berlin_desc_group *group, 140 const char *fname) 141 { 142 struct berlin_desc_function *function = group->functions; 143 144 while (function->name) { 145 if (!strcmp(function->name, fname)) 146 return function; 147 148 function++; 149 } 150 151 return NULL; 152 } 153 154 static int berlin_pinmux_set(struct pinctrl_dev *pctrl_dev, 155 unsigned function, 156 unsigned group) 157 { 158 struct berlin_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctrl_dev); 159 const struct berlin_desc_group *group_desc = pctrl->desc->groups + group; 160 struct berlin_pinctrl_function *func = pctrl->functions + function; 161 struct berlin_desc_function *function_desc = 162 berlin_pinctrl_find_function_by_name(pctrl, group_desc, 163 func->name); 164 u32 mask, val; 165 166 if (!function_desc) 167 return -EINVAL; 168 169 mask = GENMASK(group_desc->lsb + group_desc->bit_width - 1, 170 group_desc->lsb); 171 val = function_desc->muxval << group_desc->lsb; 172 regmap_update_bits(pctrl->regmap, group_desc->offset, mask, val); 173 174 return 0; 175 } 176 177 static const struct pinmux_ops berlin_pinmux_ops = { 178 .get_functions_count = &berlin_pinmux_get_functions_count, 179 .get_function_name = &berlin_pinmux_get_function_name, 180 .get_function_groups = &berlin_pinmux_get_function_groups, 181 .set_mux = &berlin_pinmux_set, 182 }; 183 184 static int berlin_pinctrl_add_function(struct berlin_pinctrl *pctrl, 185 const char *name) 186 { 187 struct berlin_pinctrl_function *function = pctrl->functions; 188 189 while (function->name) { 190 if (!strcmp(function->name, name)) { 191 function->ngroups++; 192 return -EEXIST; 193 } 194 function++; 195 } 196 197 function->name = name; 198 function->ngroups = 1; 199 200 pctrl->nfunctions++; 201 202 return 0; 203 } 204 205 static int berlin_pinctrl_build_state(struct platform_device *pdev) 206 { 207 struct berlin_pinctrl *pctrl = platform_get_drvdata(pdev); 208 struct berlin_desc_group const *desc_group; 209 struct berlin_desc_function const *desc_function; 210 int i, max_functions = 0; 211 212 pctrl->nfunctions = 0; 213 214 for (i = 0; i < pctrl->desc->ngroups; i++) { 215 desc_group = pctrl->desc->groups + i; 216 /* compute the maxiumum number of functions a group can have */ 217 max_functions += 1 << (desc_group->bit_width + 1); 218 } 219 220 /* we will reallocate later */ 221 pctrl->functions = devm_kzalloc(&pdev->dev, 222 max_functions * sizeof(*pctrl->functions), 223 GFP_KERNEL); 224 if (!pctrl->functions) 225 return -ENOMEM; 226 227 /* register all functions */ 228 for (i = 0; i < pctrl->desc->ngroups; i++) { 229 desc_group = pctrl->desc->groups + i; 230 desc_function = desc_group->functions; 231 232 while (desc_function->name) { 233 berlin_pinctrl_add_function(pctrl, desc_function->name); 234 desc_function++; 235 } 236 } 237 238 pctrl->functions = krealloc(pctrl->functions, 239 pctrl->nfunctions * sizeof(*pctrl->functions), 240 GFP_KERNEL); 241 242 /* map functions to theirs groups */ 243 for (i = 0; i < pctrl->desc->ngroups; i++) { 244 desc_group = pctrl->desc->groups + i; 245 desc_function = desc_group->functions; 246 247 while (desc_function->name) { 248 struct berlin_pinctrl_function 249 *function = pctrl->functions; 250 const char **groups; 251 bool found = false; 252 253 while (function->name) { 254 if (!strcmp(desc_function->name, function->name)) { 255 found = true; 256 break; 257 } 258 function++; 259 } 260 261 if (!found) 262 return -EINVAL; 263 264 if (!function->groups) { 265 function->groups = 266 devm_kzalloc(&pdev->dev, 267 function->ngroups * sizeof(char *), 268 GFP_KERNEL); 269 270 if (!function->groups) 271 return -ENOMEM; 272 } 273 274 groups = function->groups; 275 while (*groups) 276 groups++; 277 278 *groups = desc_group->name; 279 280 desc_function++; 281 } 282 } 283 284 return 0; 285 } 286 287 static struct pinctrl_desc berlin_pctrl_desc = { 288 .name = "berlin-pinctrl", 289 .pctlops = &berlin_pinctrl_ops, 290 .pmxops = &berlin_pinmux_ops, 291 .owner = THIS_MODULE, 292 }; 293 294 int berlin_pinctrl_probe(struct platform_device *pdev, 295 const struct berlin_pinctrl_desc *desc) 296 { 297 struct device *dev = &pdev->dev; 298 struct berlin_pinctrl *pctrl; 299 struct regmap *regmap; 300 int ret; 301 302 regmap = dev_get_regmap(&pdev->dev, NULL); 303 if (!regmap) 304 return -ENODEV; 305 306 pctrl = devm_kzalloc(dev, sizeof(*pctrl), GFP_KERNEL); 307 if (!pctrl) 308 return -ENOMEM; 309 310 platform_set_drvdata(pdev, pctrl); 311 312 pctrl->regmap = regmap; 313 pctrl->dev = &pdev->dev; 314 pctrl->desc = desc; 315 316 ret = berlin_pinctrl_build_state(pdev); 317 if (ret) { 318 dev_err(dev, "cannot build driver state: %d\n", ret); 319 return ret; 320 } 321 322 pctrl->pctrl_dev = pinctrl_register(&berlin_pctrl_desc, dev, pctrl); 323 if (!pctrl->pctrl_dev) { 324 dev_err(dev, "failed to register pinctrl driver\n"); 325 return -EINVAL; 326 } 327 328 return 0; 329 } 330