Shawn Guo | 1772311 | 2012-04-28 13:00:50 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2012 Freescale Semiconductor, Inc. |
| 3 | * |
| 4 | * The code contained herein is licensed under the GNU General Public |
| 5 | * License. You may obtain a copy of the GNU General Public License |
| 6 | * Version 2 or later at the following locations: |
| 7 | * |
| 8 | * http://www.opensource.org/licenses/gpl-license.html |
| 9 | * http://www.gnu.org/copyleft/gpl.html |
| 10 | */ |
| 11 | |
| 12 | #include <linux/err.h> |
| 13 | #include <linux/init.h> |
| 14 | #include <linux/io.h> |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/of.h> |
| 17 | #include <linux/of_address.h> |
| 18 | #include <linux/pinctrl/machine.h> |
| 19 | #include <linux/pinctrl/pinconf.h> |
| 20 | #include <linux/pinctrl/pinctrl.h> |
| 21 | #include <linux/pinctrl/pinmux.h> |
| 22 | #include <linux/platform_device.h> |
| 23 | #include <linux/slab.h> |
| 24 | #include "core.h" |
| 25 | #include "pinctrl-mxs.h" |
| 26 | |
| 27 | #define SUFFIX_LEN 4 |
| 28 | |
| 29 | struct mxs_pinctrl_data { |
| 30 | struct device *dev; |
| 31 | struct pinctrl_dev *pctl; |
| 32 | void __iomem *base; |
| 33 | struct mxs_pinctrl_soc_data *soc; |
| 34 | }; |
| 35 | |
| 36 | static int mxs_get_groups_count(struct pinctrl_dev *pctldev) |
| 37 | { |
| 38 | struct mxs_pinctrl_data *d = pinctrl_dev_get_drvdata(pctldev); |
| 39 | |
| 40 | return d->soc->ngroups; |
| 41 | } |
| 42 | |
| 43 | static const char *mxs_get_group_name(struct pinctrl_dev *pctldev, |
| 44 | unsigned group) |
| 45 | { |
| 46 | struct mxs_pinctrl_data *d = pinctrl_dev_get_drvdata(pctldev); |
| 47 | |
| 48 | return d->soc->groups[group].name; |
| 49 | } |
| 50 | |
| 51 | static int mxs_get_group_pins(struct pinctrl_dev *pctldev, unsigned group, |
| 52 | const unsigned **pins, unsigned *num_pins) |
| 53 | { |
| 54 | struct mxs_pinctrl_data *d = pinctrl_dev_get_drvdata(pctldev); |
| 55 | |
| 56 | *pins = d->soc->groups[group].pins; |
| 57 | *num_pins = d->soc->groups[group].npins; |
| 58 | |
| 59 | return 0; |
| 60 | } |
| 61 | |
| 62 | static void mxs_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s, |
| 63 | unsigned offset) |
| 64 | { |
| 65 | seq_printf(s, " %s", dev_name(pctldev->dev)); |
| 66 | } |
| 67 | |
| 68 | static int mxs_dt_node_to_map(struct pinctrl_dev *pctldev, |
| 69 | struct device_node *np, |
| 70 | struct pinctrl_map **map, unsigned *num_maps) |
| 71 | { |
| 72 | struct pinctrl_map *new_map; |
| 73 | char *group; |
| 74 | unsigned new_num; |
| 75 | unsigned long config = 0; |
| 76 | unsigned long *pconfig; |
| 77 | int length = strlen(np->name) + SUFFIX_LEN; |
| 78 | u32 val; |
| 79 | int ret; |
| 80 | |
| 81 | ret = of_property_read_u32(np, "fsl,drive-strength", &val); |
| 82 | if (!ret) |
| 83 | config = val | MA_PRESENT; |
| 84 | ret = of_property_read_u32(np, "fsl,voltage", &val); |
| 85 | if (!ret) |
| 86 | config |= val << VOL_SHIFT | VOL_PRESENT; |
| 87 | ret = of_property_read_u32(np, "fsl,pull-up", &val); |
| 88 | if (!ret) |
| 89 | config |= val << PULL_SHIFT | PULL_PRESENT; |
| 90 | |
| 91 | new_num = config ? 2 : 1; |
| 92 | new_map = kzalloc(sizeof(*new_map) * new_num, GFP_KERNEL); |
| 93 | if (!new_map) |
| 94 | return -ENOMEM; |
| 95 | |
| 96 | new_map[0].type = PIN_MAP_TYPE_MUX_GROUP; |
| 97 | new_map[0].data.mux.function = np->name; |
| 98 | |
| 99 | /* Compose group name */ |
| 100 | group = kzalloc(length, GFP_KERNEL); |
| 101 | if (!group) |
| 102 | return -ENOMEM; |
| 103 | of_property_read_u32(np, "reg", &val); |
| 104 | snprintf(group, length, "%s.%d", np->name, val); |
| 105 | new_map[0].data.mux.group = group; |
| 106 | |
| 107 | if (config) { |
| 108 | pconfig = kmemdup(&config, sizeof(config), GFP_KERNEL); |
| 109 | if (!pconfig) { |
| 110 | ret = -ENOMEM; |
| 111 | goto free; |
| 112 | } |
| 113 | |
| 114 | new_map[1].type = PIN_MAP_TYPE_CONFIGS_GROUP; |
| 115 | new_map[1].data.configs.group_or_pin = group; |
| 116 | new_map[1].data.configs.configs = pconfig; |
| 117 | new_map[1].data.configs.num_configs = 1; |
| 118 | } |
| 119 | |
| 120 | *map = new_map; |
| 121 | *num_maps = new_num; |
| 122 | |
| 123 | return 0; |
| 124 | |
| 125 | free: |
| 126 | kfree(new_map); |
| 127 | return ret; |
| 128 | } |
| 129 | |
| 130 | static void mxs_dt_free_map(struct pinctrl_dev *pctldev, |
| 131 | struct pinctrl_map *map, unsigned num_maps) |
| 132 | { |
| 133 | int i; |
| 134 | |
| 135 | for (i = 0; i < num_maps; i++) { |
| 136 | if (map[i].type == PIN_MAP_TYPE_MUX_GROUP) |
| 137 | kfree(map[i].data.mux.group); |
| 138 | if (map[i].type == PIN_MAP_TYPE_CONFIGS_GROUP) |
| 139 | kfree(map[i].data.configs.configs); |
| 140 | } |
| 141 | |
| 142 | kfree(map); |
| 143 | } |
| 144 | |
| 145 | static struct pinctrl_ops mxs_pinctrl_ops = { |
| 146 | .get_groups_count = mxs_get_groups_count, |
| 147 | .get_group_name = mxs_get_group_name, |
| 148 | .get_group_pins = mxs_get_group_pins, |
| 149 | .pin_dbg_show = mxs_pin_dbg_show, |
| 150 | .dt_node_to_map = mxs_dt_node_to_map, |
| 151 | .dt_free_map = mxs_dt_free_map, |
| 152 | }; |
| 153 | |
| 154 | static int mxs_pinctrl_get_funcs_count(struct pinctrl_dev *pctldev) |
| 155 | { |
| 156 | struct mxs_pinctrl_data *d = pinctrl_dev_get_drvdata(pctldev); |
| 157 | |
| 158 | return d->soc->nfunctions; |
| 159 | } |
| 160 | |
| 161 | static const char *mxs_pinctrl_get_func_name(struct pinctrl_dev *pctldev, |
| 162 | unsigned function) |
| 163 | { |
| 164 | struct mxs_pinctrl_data *d = pinctrl_dev_get_drvdata(pctldev); |
| 165 | |
| 166 | return d->soc->functions[function].name; |
| 167 | } |
| 168 | |
| 169 | static int mxs_pinctrl_get_func_groups(struct pinctrl_dev *pctldev, |
| 170 | unsigned group, |
| 171 | const char * const **groups, |
| 172 | unsigned * const num_groups) |
| 173 | { |
| 174 | struct mxs_pinctrl_data *d = pinctrl_dev_get_drvdata(pctldev); |
| 175 | |
| 176 | *groups = d->soc->functions[group].groups; |
| 177 | *num_groups = d->soc->functions[group].ngroups; |
| 178 | |
| 179 | return 0; |
| 180 | } |
| 181 | |
| 182 | static int mxs_pinctrl_enable(struct pinctrl_dev *pctldev, unsigned selector, |
| 183 | unsigned group) |
| 184 | { |
| 185 | struct mxs_pinctrl_data *d = pinctrl_dev_get_drvdata(pctldev); |
| 186 | struct mxs_group *g = &d->soc->groups[group]; |
| 187 | void __iomem *reg; |
| 188 | u8 bank, shift; |
| 189 | u16 pin; |
| 190 | int i; |
| 191 | |
| 192 | for (i = 0; i < g->npins; i++) { |
| 193 | bank = PINID_TO_BANK(g->pins[i]); |
| 194 | pin = PINID_TO_PIN(g->pins[i]); |
| 195 | reg = d->base + d->soc->regs->muxsel; |
| 196 | reg += bank * 0x20 + pin / 16 * 0x10; |
| 197 | shift = pin % 16 * 2; |
| 198 | |
| 199 | writel(0x3 << shift, reg + CLR); |
| 200 | writel(g->muxsel[i] << shift, reg + SET); |
| 201 | } |
| 202 | |
| 203 | return 0; |
| 204 | } |
| 205 | |
| 206 | static void mxs_pinctrl_disable(struct pinctrl_dev *pctldev, |
| 207 | unsigned function, unsigned group) |
| 208 | { |
| 209 | /* Nothing to do here */ |
| 210 | } |
| 211 | |
| 212 | static struct pinmux_ops mxs_pinmux_ops = { |
| 213 | .get_functions_count = mxs_pinctrl_get_funcs_count, |
| 214 | .get_function_name = mxs_pinctrl_get_func_name, |
| 215 | .get_function_groups = mxs_pinctrl_get_func_groups, |
| 216 | .enable = mxs_pinctrl_enable, |
| 217 | .disable = mxs_pinctrl_disable, |
| 218 | }; |
| 219 | |
| 220 | static int mxs_pinconf_get(struct pinctrl_dev *pctldev, |
| 221 | unsigned pin, unsigned long *config) |
| 222 | { |
| 223 | return -ENOTSUPP; |
| 224 | } |
| 225 | |
| 226 | static int mxs_pinconf_set(struct pinctrl_dev *pctldev, |
| 227 | unsigned pin, unsigned long config) |
| 228 | { |
| 229 | return -ENOTSUPP; |
| 230 | } |
| 231 | |
| 232 | static int mxs_pinconf_group_get(struct pinctrl_dev *pctldev, |
| 233 | unsigned group, unsigned long *config) |
| 234 | { |
| 235 | struct mxs_pinctrl_data *d = pinctrl_dev_get_drvdata(pctldev); |
| 236 | |
| 237 | *config = d->soc->groups[group].config; |
| 238 | |
| 239 | return 0; |
| 240 | } |
| 241 | |
| 242 | static int mxs_pinconf_group_set(struct pinctrl_dev *pctldev, |
| 243 | unsigned group, unsigned long config) |
| 244 | { |
| 245 | struct mxs_pinctrl_data *d = pinctrl_dev_get_drvdata(pctldev); |
| 246 | struct mxs_group *g = &d->soc->groups[group]; |
| 247 | void __iomem *reg; |
| 248 | u8 ma, vol, pull, bank, shift; |
| 249 | u16 pin; |
| 250 | int i; |
| 251 | |
| 252 | ma = CONFIG_TO_MA(config); |
| 253 | vol = CONFIG_TO_VOL(config); |
| 254 | pull = CONFIG_TO_PULL(config); |
| 255 | |
| 256 | for (i = 0; i < g->npins; i++) { |
| 257 | bank = PINID_TO_BANK(g->pins[i]); |
| 258 | pin = PINID_TO_PIN(g->pins[i]); |
| 259 | |
| 260 | /* drive */ |
| 261 | reg = d->base + d->soc->regs->drive; |
| 262 | reg += bank * 0x40 + pin / 8 * 0x10; |
| 263 | |
| 264 | /* mA */ |
| 265 | if (config & MA_PRESENT) { |
| 266 | shift = pin % 8 * 4; |
| 267 | writel(0x3 << shift, reg + CLR); |
| 268 | writel(ma << shift, reg + SET); |
| 269 | } |
| 270 | |
| 271 | /* vol */ |
| 272 | if (config & VOL_PRESENT) { |
| 273 | shift = pin % 8 * 4 + 2; |
| 274 | if (vol) |
| 275 | writel(1 << shift, reg + SET); |
| 276 | else |
| 277 | writel(1 << shift, reg + CLR); |
| 278 | } |
| 279 | |
| 280 | /* pull */ |
| 281 | if (config & PULL_PRESENT) { |
| 282 | reg = d->base + d->soc->regs->pull; |
| 283 | reg += bank * 0x10; |
| 284 | shift = pin; |
| 285 | if (pull) |
| 286 | writel(1 << shift, reg + SET); |
| 287 | else |
| 288 | writel(1 << shift, reg + CLR); |
| 289 | } |
| 290 | } |
| 291 | |
| 292 | /* cache the config value for mxs_pinconf_group_get() */ |
| 293 | g->config = config; |
| 294 | |
| 295 | return 0; |
| 296 | } |
| 297 | |
| 298 | static void mxs_pinconf_dbg_show(struct pinctrl_dev *pctldev, |
| 299 | struct seq_file *s, unsigned pin) |
| 300 | { |
| 301 | /* Not support */ |
| 302 | } |
| 303 | |
| 304 | static void mxs_pinconf_group_dbg_show(struct pinctrl_dev *pctldev, |
| 305 | struct seq_file *s, unsigned group) |
| 306 | { |
| 307 | unsigned long config; |
| 308 | |
| 309 | if (!mxs_pinconf_group_get(pctldev, group, &config)) |
| 310 | seq_printf(s, "0x%lx", config); |
| 311 | } |
| 312 | |
| 313 | struct pinconf_ops mxs_pinconf_ops = { |
| 314 | .pin_config_get = mxs_pinconf_get, |
| 315 | .pin_config_set = mxs_pinconf_set, |
| 316 | .pin_config_group_get = mxs_pinconf_group_get, |
| 317 | .pin_config_group_set = mxs_pinconf_group_set, |
| 318 | .pin_config_dbg_show = mxs_pinconf_dbg_show, |
| 319 | .pin_config_group_dbg_show = mxs_pinconf_group_dbg_show, |
| 320 | }; |
| 321 | |
| 322 | static struct pinctrl_desc mxs_pinctrl_desc = { |
| 323 | .pctlops = &mxs_pinctrl_ops, |
| 324 | .pmxops = &mxs_pinmux_ops, |
| 325 | .confops = &mxs_pinconf_ops, |
| 326 | .owner = THIS_MODULE, |
| 327 | }; |
| 328 | |
| 329 | static int __devinit mxs_pinctrl_parse_group(struct platform_device *pdev, |
| 330 | struct device_node *np, int idx, |
| 331 | const char **out_name) |
| 332 | { |
| 333 | struct mxs_pinctrl_data *d = platform_get_drvdata(pdev); |
| 334 | struct mxs_group *g = &d->soc->groups[idx]; |
| 335 | struct property *prop; |
| 336 | const char *propname = "fsl,pinmux-ids"; |
| 337 | char *group; |
| 338 | int length = strlen(np->name) + SUFFIX_LEN; |
| 339 | int i; |
| 340 | u32 val; |
| 341 | |
| 342 | group = devm_kzalloc(&pdev->dev, length, GFP_KERNEL); |
| 343 | if (!group) |
| 344 | return -ENOMEM; |
| 345 | of_property_read_u32(np, "reg", &val); |
| 346 | snprintf(group, length, "%s.%d", np->name, val); |
| 347 | g->name = group; |
| 348 | |
| 349 | prop = of_find_property(np, propname, &length); |
| 350 | if (!prop) |
| 351 | return -EINVAL; |
| 352 | g->npins = length / sizeof(u32); |
| 353 | |
| 354 | g->pins = devm_kzalloc(&pdev->dev, g->npins * sizeof(*g->pins), |
| 355 | GFP_KERNEL); |
| 356 | if (!g->pins) |
| 357 | return -ENOMEM; |
| 358 | |
| 359 | g->muxsel = devm_kzalloc(&pdev->dev, g->npins * sizeof(*g->muxsel), |
| 360 | GFP_KERNEL); |
| 361 | if (!g->muxsel) |
| 362 | return -ENOMEM; |
| 363 | |
| 364 | of_property_read_u32_array(np, propname, g->pins, g->npins); |
| 365 | for (i = 0; i < g->npins; i++) { |
| 366 | g->muxsel[i] = MUXID_TO_MUXSEL(g->pins[i]); |
| 367 | g->pins[i] = MUXID_TO_PINID(g->pins[i]); |
| 368 | } |
| 369 | |
| 370 | *out_name = g->name; |
| 371 | |
| 372 | return 0; |
| 373 | } |
| 374 | |
| 375 | static int __devinit mxs_pinctrl_probe_dt(struct platform_device *pdev, |
| 376 | struct mxs_pinctrl_data *d) |
| 377 | { |
| 378 | struct mxs_pinctrl_soc_data *soc = d->soc; |
| 379 | struct device_node *np = pdev->dev.of_node; |
| 380 | struct device_node *child; |
| 381 | struct mxs_function *f; |
| 382 | const char *fn, *fnull = ""; |
| 383 | int i = 0, idxf = 0, idxg = 0; |
| 384 | int ret; |
| 385 | u32 val; |
| 386 | |
| 387 | child = of_get_next_child(np, NULL); |
| 388 | if (!child) { |
| 389 | dev_err(&pdev->dev, "no group is defined\n"); |
| 390 | return -ENOENT; |
| 391 | } |
| 392 | |
| 393 | /* Count total functions and groups */ |
| 394 | fn = fnull; |
| 395 | for_each_child_of_node(np, child) { |
| 396 | /* Skip pure pinconf node */ |
| 397 | if (of_property_read_u32(child, "reg", &val)) |
| 398 | continue; |
| 399 | if (strcmp(fn, child->name)) { |
| 400 | fn = child->name; |
| 401 | soc->nfunctions++; |
| 402 | } |
| 403 | soc->ngroups++; |
| 404 | } |
| 405 | |
| 406 | soc->functions = devm_kzalloc(&pdev->dev, soc->nfunctions * |
| 407 | sizeof(*soc->functions), GFP_KERNEL); |
| 408 | if (!soc->functions) |
| 409 | return -ENOMEM; |
| 410 | |
| 411 | soc->groups = devm_kzalloc(&pdev->dev, soc->ngroups * |
| 412 | sizeof(*soc->groups), GFP_KERNEL); |
| 413 | if (!soc->groups) |
| 414 | return -ENOMEM; |
| 415 | |
| 416 | /* Count groups for each function */ |
| 417 | fn = fnull; |
| 418 | f = &soc->functions[idxf]; |
| 419 | for_each_child_of_node(np, child) { |
| 420 | if (of_property_read_u32(child, "reg", &val)) |
| 421 | continue; |
| 422 | if (strcmp(fn, child->name)) { |
| 423 | f = &soc->functions[idxf++]; |
| 424 | f->name = fn = child->name; |
| 425 | } |
| 426 | f->ngroups++; |
| 427 | }; |
| 428 | |
| 429 | /* Get groups for each function */ |
| 430 | idxf = 0; |
| 431 | fn = fnull; |
| 432 | for_each_child_of_node(np, child) { |
| 433 | if (of_property_read_u32(child, "reg", &val)) |
| 434 | continue; |
| 435 | if (strcmp(fn, child->name)) { |
| 436 | f = &soc->functions[idxf++]; |
| 437 | f->groups = devm_kzalloc(&pdev->dev, f->ngroups * |
| 438 | sizeof(*f->groups), |
| 439 | GFP_KERNEL); |
| 440 | if (!f->groups) |
| 441 | return -ENOMEM; |
| 442 | fn = child->name; |
| 443 | i = 0; |
| 444 | } |
| 445 | ret = mxs_pinctrl_parse_group(pdev, child, idxg++, |
| 446 | &f->groups[i++]); |
| 447 | if (ret) |
| 448 | return ret; |
| 449 | } |
| 450 | |
| 451 | return 0; |
| 452 | } |
| 453 | |
| 454 | int __devinit mxs_pinctrl_probe(struct platform_device *pdev, |
| 455 | struct mxs_pinctrl_soc_data *soc) |
| 456 | { |
| 457 | struct device_node *np = pdev->dev.of_node; |
| 458 | struct mxs_pinctrl_data *d; |
| 459 | int ret; |
| 460 | |
| 461 | d = devm_kzalloc(&pdev->dev, sizeof(*d), GFP_KERNEL); |
| 462 | if (!d) |
| 463 | return -ENOMEM; |
| 464 | |
| 465 | d->dev = &pdev->dev; |
| 466 | d->soc = soc; |
| 467 | |
| 468 | d->base = of_iomap(np, 0); |
| 469 | if (!d->base) |
| 470 | return -EADDRNOTAVAIL; |
| 471 | |
| 472 | mxs_pinctrl_desc.pins = d->soc->pins; |
| 473 | mxs_pinctrl_desc.npins = d->soc->npins; |
| 474 | mxs_pinctrl_desc.name = dev_name(&pdev->dev); |
| 475 | |
| 476 | platform_set_drvdata(pdev, d); |
| 477 | |
| 478 | ret = mxs_pinctrl_probe_dt(pdev, d); |
| 479 | if (ret) { |
| 480 | dev_err(&pdev->dev, "dt probe failed: %d\n", ret); |
| 481 | goto err; |
| 482 | } |
| 483 | |
| 484 | d->pctl = pinctrl_register(&mxs_pinctrl_desc, &pdev->dev, d); |
| 485 | if (!d->pctl) { |
| 486 | dev_err(&pdev->dev, "Couldn't register MXS pinctrl driver\n"); |
| 487 | ret = -EINVAL; |
| 488 | goto err; |
| 489 | } |
| 490 | |
| 491 | return 0; |
| 492 | |
| 493 | err: |
| 494 | iounmap(d->base); |
| 495 | return ret; |
| 496 | } |
| 497 | EXPORT_SYMBOL_GPL(mxs_pinctrl_probe); |
| 498 | |
| 499 | int __devexit mxs_pinctrl_remove(struct platform_device *pdev) |
| 500 | { |
| 501 | struct mxs_pinctrl_data *d = platform_get_drvdata(pdev); |
| 502 | |
| 503 | pinctrl_unregister(d->pctl); |
| 504 | iounmap(d->base); |
| 505 | |
| 506 | return 0; |
| 507 | } |
| 508 | EXPORT_SYMBOL_GPL(mxs_pinctrl_remove); |