1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Marvell PXA2xx family pin control 4 * 5 * Copyright (C) 2015 Robert Jarzmik 6 */ 7 8 #include <linux/bitops.h> 9 #include <linux/io.h> 10 #include <linux/of.h> 11 #include <linux/of_address.h> 12 #include <linux/module.h> 13 #include <linux/pinctrl/machine.h> 14 #include <linux/pinctrl/pinconf.h> 15 #include <linux/pinctrl/pinconf-generic.h> 16 #include <linux/pinctrl/pinmux.h> 17 #include <linux/pinctrl/pinctrl.h> 18 #include <linux/platform_device.h> 19 #include <linux/slab.h> 20 21 #include "../pinctrl-utils.h" 22 #include "pinctrl-pxa2xx.h" 23 24 static int pxa2xx_pctrl_get_groups_count(struct pinctrl_dev *pctldev) 25 { 26 struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); 27 28 return pctl->ngroups; 29 } 30 31 static const char *pxa2xx_pctrl_get_group_name(struct pinctrl_dev *pctldev, 32 unsigned tgroup) 33 { 34 struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); 35 struct pxa_pinctrl_group *group = pctl->groups + tgroup; 36 37 return group->name; 38 } 39 40 static int pxa2xx_pctrl_get_group_pins(struct pinctrl_dev *pctldev, 41 unsigned tgroup, 42 const unsigned **pins, 43 unsigned *num_pins) 44 { 45 struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); 46 struct pxa_pinctrl_group *group = pctl->groups + tgroup; 47 48 *pins = (unsigned *)&group->pin; 49 *num_pins = 1; 50 51 return 0; 52 } 53 54 static const struct pinctrl_ops pxa2xx_pctl_ops = { 55 #ifdef CONFIG_OF 56 .dt_node_to_map = pinconf_generic_dt_node_to_map_all, 57 .dt_free_map = pinctrl_utils_free_map, 58 #endif 59 .get_groups_count = pxa2xx_pctrl_get_groups_count, 60 .get_group_name = pxa2xx_pctrl_get_group_name, 61 .get_group_pins = pxa2xx_pctrl_get_group_pins, 62 }; 63 64 static struct pxa_desc_function * 65 pxa_desc_by_func_group(struct pxa_pinctrl *pctl, const char *pin_name, 66 const char *func_name) 67 { 68 int i; 69 struct pxa_desc_function *df; 70 71 for (i = 0; i < pctl->npins; i++) { 72 const struct pxa_desc_pin *pin = pctl->ppins + i; 73 74 if (!strcmp(pin->pin.name, pin_name)) 75 for (df = pin->functions; df->name; df++) 76 if (!strcmp(df->name, func_name)) 77 return df; 78 } 79 80 return NULL; 81 } 82 83 static int pxa2xx_pmx_gpio_set_direction(struct pinctrl_dev *pctldev, 84 struct pinctrl_gpio_range *range, 85 unsigned pin, 86 bool input) 87 { 88 struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); 89 unsigned long flags; 90 uint32_t val; 91 void __iomem *gpdr; 92 93 gpdr = pctl->base_gpdr[pin / 32]; 94 dev_dbg(pctl->dev, "set_direction(pin=%d): dir=%d\n", 95 pin, !input); 96 97 spin_lock_irqsave(&pctl->lock, flags); 98 99 val = readl_relaxed(gpdr); 100 val = (val & ~BIT(pin % 32)) | (input ? 0 : BIT(pin % 32)); 101 writel_relaxed(val, gpdr); 102 103 spin_unlock_irqrestore(&pctl->lock, flags); 104 105 return 0; 106 } 107 108 static const char *pxa2xx_pmx_get_func_name(struct pinctrl_dev *pctldev, 109 unsigned function) 110 { 111 struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); 112 struct pxa_pinctrl_function *pf = pctl->functions + function; 113 114 return pf->name; 115 } 116 117 static int pxa2xx_get_functions_count(struct pinctrl_dev *pctldev) 118 { 119 struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); 120 121 return pctl->nfuncs; 122 } 123 124 static int pxa2xx_pmx_get_func_groups(struct pinctrl_dev *pctldev, 125 unsigned function, 126 const char * const **groups, 127 unsigned * const num_groups) 128 { 129 struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); 130 struct pxa_pinctrl_function *pf = pctl->functions + function; 131 132 *groups = pf->groups; 133 *num_groups = pf->ngroups; 134 135 return 0; 136 } 137 138 static int pxa2xx_pmx_set_mux(struct pinctrl_dev *pctldev, unsigned function, 139 unsigned tgroup) 140 { 141 struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); 142 struct pxa_pinctrl_group *group = pctl->groups + tgroup; 143 struct pxa_desc_function *df; 144 int pin, shift; 145 unsigned long flags; 146 void __iomem *gafr, *gpdr; 147 u32 val; 148 149 150 df = pxa_desc_by_func_group(pctl, group->name, 151 (pctl->functions + function)->name); 152 if (!df) 153 return -EINVAL; 154 155 pin = group->pin; 156 gafr = pctl->base_gafr[pin / 16]; 157 gpdr = pctl->base_gpdr[pin / 32]; 158 shift = (pin % 16) << 1; 159 dev_dbg(pctl->dev, "set_mux(pin=%d): af=%d dir=%d\n", 160 pin, df->muxval >> 1, df->muxval & 0x1); 161 162 spin_lock_irqsave(&pctl->lock, flags); 163 164 val = readl_relaxed(gafr); 165 val = (val & ~(0x3 << shift)) | ((df->muxval >> 1) << shift); 166 writel_relaxed(val, gafr); 167 168 val = readl_relaxed(gpdr); 169 val = (val & ~BIT(pin % 32)) | ((df->muxval & 1) ? BIT(pin % 32) : 0); 170 writel_relaxed(val, gpdr); 171 172 spin_unlock_irqrestore(&pctl->lock, flags); 173 174 return 0; 175 } 176 static const struct pinmux_ops pxa2xx_pinmux_ops = { 177 .get_functions_count = pxa2xx_get_functions_count, 178 .get_function_name = pxa2xx_pmx_get_func_name, 179 .get_function_groups = pxa2xx_pmx_get_func_groups, 180 .set_mux = pxa2xx_pmx_set_mux, 181 .gpio_set_direction = pxa2xx_pmx_gpio_set_direction, 182 }; 183 184 static int pxa2xx_pconf_group_get(struct pinctrl_dev *pctldev, 185 unsigned group, 186 unsigned long *config) 187 { 188 struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); 189 struct pxa_pinctrl_group *g = pctl->groups + group; 190 unsigned long flags; 191 unsigned pin = g->pin; 192 void __iomem *pgsr = pctl->base_pgsr[pin / 32]; 193 u32 val; 194 195 spin_lock_irqsave(&pctl->lock, flags); 196 val = readl_relaxed(pgsr) & BIT(pin % 32); 197 *config = val ? PIN_CONFIG_LOW_POWER_MODE : 0; 198 spin_unlock_irqrestore(&pctl->lock, flags); 199 200 dev_dbg(pctl->dev, "get sleep gpio state(pin=%d) %d\n", 201 pin, !!val); 202 return 0; 203 } 204 205 static int pxa2xx_pconf_group_set(struct pinctrl_dev *pctldev, 206 unsigned group, 207 unsigned long *configs, 208 unsigned num_configs) 209 { 210 struct pxa_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev); 211 struct pxa_pinctrl_group *g = pctl->groups + group; 212 unsigned long flags; 213 unsigned pin = g->pin; 214 void __iomem *pgsr = pctl->base_pgsr[pin / 32]; 215 int i, is_set = 0; 216 u32 val; 217 218 for (i = 0; i < num_configs; i++) { 219 switch (pinconf_to_config_param(configs[i])) { 220 case PIN_CONFIG_LOW_POWER_MODE: 221 is_set = pinconf_to_config_argument(configs[i]); 222 break; 223 default: 224 return -EINVAL; 225 } 226 } 227 228 dev_dbg(pctl->dev, "set sleep gpio state(pin=%d) %d\n", 229 pin, is_set); 230 231 spin_lock_irqsave(&pctl->lock, flags); 232 val = readl_relaxed(pgsr); 233 val = (val & ~BIT(pin % 32)) | (is_set ? BIT(pin % 32) : 0); 234 writel_relaxed(val, pgsr); 235 spin_unlock_irqrestore(&pctl->lock, flags); 236 237 return 0; 238 } 239 240 static const struct pinconf_ops pxa2xx_pconf_ops = { 241 .pin_config_group_get = pxa2xx_pconf_group_get, 242 .pin_config_group_set = pxa2xx_pconf_group_set, 243 .is_generic = true, 244 }; 245 246 static struct pinctrl_desc pxa2xx_pinctrl_desc = { 247 .confops = &pxa2xx_pconf_ops, 248 .pctlops = &pxa2xx_pctl_ops, 249 .pmxops = &pxa2xx_pinmux_ops, 250 }; 251 252 static const struct pxa_pinctrl_function * 253 pxa2xx_find_function(struct pxa_pinctrl *pctl, const char *fname, 254 const struct pxa_pinctrl_function *functions) 255 { 256 const struct pxa_pinctrl_function *func; 257 258 for (func = functions; func->name; func++) 259 if (!strcmp(fname, func->name)) 260 return func; 261 262 return NULL; 263 } 264 265 static int pxa2xx_build_functions(struct pxa_pinctrl *pctl) 266 { 267 int i; 268 struct pxa_pinctrl_function *functions; 269 struct pxa_desc_function *df; 270 271 /* 272 * Each pin can have at most 6 alternate functions, and 2 gpio functions 273 * which are common to each pin. As there are more than 2 pins without 274 * alternate function, 6 * npins is an absolute high limit of the number 275 * of functions. 276 */ 277 functions = devm_kcalloc(pctl->dev, pctl->npins * 6, 278 sizeof(*functions), GFP_KERNEL); 279 if (!functions) 280 return -ENOMEM; 281 282 for (i = 0; i < pctl->npins; i++) 283 for (df = pctl->ppins[i].functions; df->name; df++) 284 if (!pxa2xx_find_function(pctl, df->name, functions)) 285 (functions + pctl->nfuncs++)->name = df->name; 286 pctl->functions = devm_kmemdup(pctl->dev, functions, 287 pctl->nfuncs * sizeof(*functions), 288 GFP_KERNEL); 289 if (!pctl->functions) 290 return -ENOMEM; 291 292 devm_kfree(pctl->dev, functions); 293 return 0; 294 } 295 296 static int pxa2xx_build_groups(struct pxa_pinctrl *pctl) 297 { 298 int i, j, ngroups; 299 struct pxa_pinctrl_function *func; 300 struct pxa_desc_function *df; 301 char **gtmp; 302 303 gtmp = devm_kmalloc_array(pctl->dev, pctl->npins, sizeof(*gtmp), 304 GFP_KERNEL); 305 if (!gtmp) 306 return -ENOMEM; 307 308 for (i = 0; i < pctl->nfuncs; i++) { 309 ngroups = 0; 310 for (j = 0; j < pctl->npins; j++) 311 for (df = pctl->ppins[j].functions; df->name; 312 df++) 313 if (!strcmp(pctl->functions[i].name, 314 df->name)) 315 gtmp[ngroups++] = (char *) 316 pctl->ppins[j].pin.name; 317 func = pctl->functions + i; 318 func->ngroups = ngroups; 319 func->groups = 320 devm_kmalloc_array(pctl->dev, ngroups, 321 sizeof(char *), GFP_KERNEL); 322 if (!func->groups) 323 return -ENOMEM; 324 325 memcpy(func->groups, gtmp, ngroups * sizeof(*gtmp)); 326 } 327 328 devm_kfree(pctl->dev, gtmp); 329 return 0; 330 } 331 332 static int pxa2xx_build_state(struct pxa_pinctrl *pctl, 333 const struct pxa_desc_pin *ppins, int npins) 334 { 335 struct pxa_pinctrl_group *group; 336 struct pinctrl_pin_desc *pins; 337 int ret, i; 338 339 pctl->npins = npins; 340 pctl->ppins = ppins; 341 pctl->ngroups = npins; 342 343 pctl->desc.npins = npins; 344 pins = devm_kcalloc(pctl->dev, npins, sizeof(*pins), GFP_KERNEL); 345 if (!pins) 346 return -ENOMEM; 347 348 pctl->desc.pins = pins; 349 for (i = 0; i < npins; i++) 350 pins[i] = ppins[i].pin; 351 352 pctl->groups = devm_kmalloc_array(pctl->dev, pctl->ngroups, 353 sizeof(*pctl->groups), GFP_KERNEL); 354 if (!pctl->groups) 355 return -ENOMEM; 356 357 for (i = 0; i < npins; i++) { 358 group = pctl->groups + i; 359 group->name = ppins[i].pin.name; 360 group->pin = ppins[i].pin.number; 361 } 362 363 ret = pxa2xx_build_functions(pctl); 364 if (ret) 365 return ret; 366 367 ret = pxa2xx_build_groups(pctl); 368 if (ret) 369 return ret; 370 371 return 0; 372 } 373 374 int pxa2xx_pinctrl_init(struct platform_device *pdev, 375 const struct pxa_desc_pin *ppins, int npins, 376 void __iomem *base_gafr[], void __iomem *base_gpdr[], 377 void __iomem *base_pgsr[]) 378 { 379 struct pxa_pinctrl *pctl; 380 int ret, i, maxpin = 0; 381 382 for (i = 0; i < npins; i++) 383 maxpin = max_t(int, ppins[i].pin.number, maxpin); 384 385 pctl = devm_kzalloc(&pdev->dev, sizeof(*pctl), GFP_KERNEL); 386 if (!pctl) 387 return -ENOMEM; 388 pctl->base_gafr = devm_kcalloc(&pdev->dev, roundup(maxpin, 16), 389 sizeof(*pctl->base_gafr), GFP_KERNEL); 390 pctl->base_gpdr = devm_kcalloc(&pdev->dev, roundup(maxpin, 32), 391 sizeof(*pctl->base_gpdr), GFP_KERNEL); 392 pctl->base_pgsr = devm_kcalloc(&pdev->dev, roundup(maxpin, 32), 393 sizeof(*pctl->base_pgsr), GFP_KERNEL); 394 if (!pctl->base_gafr || !pctl->base_gpdr || !pctl->base_pgsr) 395 return -ENOMEM; 396 397 platform_set_drvdata(pdev, pctl); 398 spin_lock_init(&pctl->lock); 399 400 pctl->dev = &pdev->dev; 401 pctl->desc = pxa2xx_pinctrl_desc; 402 pctl->desc.name = dev_name(&pdev->dev); 403 pctl->desc.owner = THIS_MODULE; 404 405 for (i = 0; i < roundup(maxpin, 16); i += 16) 406 pctl->base_gafr[i / 16] = base_gafr[i / 16]; 407 for (i = 0; i < roundup(maxpin, 32); i += 32) { 408 pctl->base_gpdr[i / 32] = base_gpdr[i / 32]; 409 pctl->base_pgsr[i / 32] = base_pgsr[i / 32]; 410 } 411 412 ret = pxa2xx_build_state(pctl, ppins, npins); 413 if (ret) 414 return ret; 415 416 pctl->pctl_dev = devm_pinctrl_register(&pdev->dev, &pctl->desc, pctl); 417 if (IS_ERR(pctl->pctl_dev)) { 418 dev_err(&pdev->dev, "couldn't register pinctrl driver\n"); 419 return PTR_ERR(pctl->pctl_dev); 420 } 421 422 dev_info(&pdev->dev, "initialized pxa2xx pinctrl driver\n"); 423 424 return 0; 425 } 426 EXPORT_SYMBOL_GPL(pxa2xx_pinctrl_init); 427 428 int pxa2xx_pinctrl_exit(struct platform_device *pdev) 429 { 430 struct pxa_pinctrl *pctl = platform_get_drvdata(pdev); 431 432 pinctrl_unregister(pctl->pctl_dev); 433 return 0; 434 } 435 EXPORT_SYMBOL_GPL(pxa2xx_pinctrl_exit); 436 437 MODULE_AUTHOR("Robert Jarzmik <robert.jarzmik@free.fr>"); 438 MODULE_DESCRIPTION("Marvell PXA2xx pinctrl driver"); 439 MODULE_LICENSE("GPL v2"); 440