1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * drivers/mfd/mfd-core.c 4 * 5 * core MFD support 6 * Copyright (c) 2006 Ian Molton 7 * Copyright (c) 2007,2008 Dmitry Baryshkov 8 */ 9 10 #include <linux/kernel.h> 11 #include <linux/platform_device.h> 12 #include <linux/acpi.h> 13 #include <linux/list.h> 14 #include <linux/property.h> 15 #include <linux/mfd/core.h> 16 #include <linux/pm_runtime.h> 17 #include <linux/slab.h> 18 #include <linux/module.h> 19 #include <linux/irqdomain.h> 20 #include <linux/of.h> 21 #include <linux/of_address.h> 22 #include <linux/regulator/consumer.h> 23 24 static LIST_HEAD(mfd_of_node_list); 25 26 struct mfd_of_node_entry { 27 struct list_head list; 28 struct device *dev; 29 struct device_node *np; 30 }; 31 32 static struct device_type mfd_dev_type = { 33 .name = "mfd_device", 34 }; 35 36 int mfd_cell_enable(struct platform_device *pdev) 37 { 38 const struct mfd_cell *cell = mfd_get_cell(pdev); 39 40 if (!cell->enable) { 41 dev_dbg(&pdev->dev, "No .enable() call-back registered\n"); 42 return 0; 43 } 44 45 return cell->enable(pdev); 46 } 47 EXPORT_SYMBOL(mfd_cell_enable); 48 49 int mfd_cell_disable(struct platform_device *pdev) 50 { 51 const struct mfd_cell *cell = mfd_get_cell(pdev); 52 53 if (!cell->disable) { 54 dev_dbg(&pdev->dev, "No .disable() call-back registered\n"); 55 return 0; 56 } 57 58 return cell->disable(pdev); 59 } 60 EXPORT_SYMBOL(mfd_cell_disable); 61 62 #if IS_ENABLED(CONFIG_ACPI) 63 struct match_ids_walk_data { 64 struct acpi_device_id *ids; 65 struct acpi_device *adev; 66 }; 67 68 static int match_device_ids(struct acpi_device *adev, void *data) 69 { 70 struct match_ids_walk_data *wd = data; 71 72 if (!acpi_match_device_ids(adev, wd->ids)) { 73 wd->adev = adev; 74 return 1; 75 } 76 77 return 0; 78 } 79 80 static void mfd_acpi_add_device(const struct mfd_cell *cell, 81 struct platform_device *pdev) 82 { 83 const struct mfd_cell_acpi_match *match = cell->acpi_match; 84 struct acpi_device *adev = NULL; 85 struct acpi_device *parent; 86 87 parent = ACPI_COMPANION(pdev->dev.parent); 88 if (!parent) 89 return; 90 91 /* 92 * MFD child device gets its ACPI handle either from the ACPI device 93 * directly under the parent that matches the either _HID or _CID, or 94 * _ADR or it will use the parent handle if is no ID is given. 95 * 96 * Note that use of _ADR is a grey area in the ACPI specification, 97 * though at least Intel Galileo Gen 2 is using it to distinguish 98 * the children devices. 99 */ 100 if (match) { 101 if (match->pnpid) { 102 struct acpi_device_id ids[2] = {}; 103 struct match_ids_walk_data wd = { 104 .adev = NULL, 105 .ids = ids, 106 }; 107 108 strlcpy(ids[0].id, match->pnpid, sizeof(ids[0].id)); 109 acpi_dev_for_each_child(parent, match_device_ids, &wd); 110 adev = wd.adev; 111 } else { 112 adev = acpi_find_child_device(parent, match->adr, false); 113 } 114 } 115 116 ACPI_COMPANION_SET(&pdev->dev, adev ?: parent); 117 } 118 #else 119 static inline void mfd_acpi_add_device(const struct mfd_cell *cell, 120 struct platform_device *pdev) 121 { 122 } 123 #endif 124 125 static int mfd_match_of_node_to_dev(struct platform_device *pdev, 126 struct device_node *np, 127 const struct mfd_cell *cell) 128 { 129 #if IS_ENABLED(CONFIG_OF) 130 struct mfd_of_node_entry *of_entry; 131 const __be32 *reg; 132 u64 of_node_addr; 133 134 /* Skip if OF node has previously been allocated to a device */ 135 list_for_each_entry(of_entry, &mfd_of_node_list, list) 136 if (of_entry->np == np) 137 return -EAGAIN; 138 139 if (!cell->use_of_reg) 140 /* No of_reg defined - allocate first free compatible match */ 141 goto allocate_of_node; 142 143 /* We only care about each node's first defined address */ 144 reg = of_get_address(np, 0, NULL, NULL); 145 if (!reg) 146 /* OF node does not contatin a 'reg' property to match to */ 147 return -EAGAIN; 148 149 of_node_addr = of_read_number(reg, of_n_addr_cells(np)); 150 151 if (cell->of_reg != of_node_addr) 152 /* No match */ 153 return -EAGAIN; 154 155 allocate_of_node: 156 of_entry = kzalloc(sizeof(*of_entry), GFP_KERNEL); 157 if (!of_entry) 158 return -ENOMEM; 159 160 of_entry->dev = &pdev->dev; 161 of_entry->np = np; 162 list_add_tail(&of_entry->list, &mfd_of_node_list); 163 164 pdev->dev.of_node = np; 165 pdev->dev.fwnode = &np->fwnode; 166 #endif 167 return 0; 168 } 169 170 static int mfd_add_device(struct device *parent, int id, 171 const struct mfd_cell *cell, 172 struct resource *mem_base, 173 int irq_base, struct irq_domain *domain) 174 { 175 struct resource *res; 176 struct platform_device *pdev; 177 struct device_node *np = NULL; 178 struct mfd_of_node_entry *of_entry, *tmp; 179 int ret = -ENOMEM; 180 int platform_id; 181 int r; 182 183 if (id == PLATFORM_DEVID_AUTO) 184 platform_id = id; 185 else 186 platform_id = id + cell->id; 187 188 pdev = platform_device_alloc(cell->name, platform_id); 189 if (!pdev) 190 goto fail_alloc; 191 192 pdev->mfd_cell = kmemdup(cell, sizeof(*cell), GFP_KERNEL); 193 if (!pdev->mfd_cell) 194 goto fail_device; 195 196 res = kcalloc(cell->num_resources, sizeof(*res), GFP_KERNEL); 197 if (!res) 198 goto fail_device; 199 200 pdev->dev.parent = parent; 201 pdev->dev.type = &mfd_dev_type; 202 pdev->dev.dma_mask = parent->dma_mask; 203 pdev->dev.dma_parms = parent->dma_parms; 204 pdev->dev.coherent_dma_mask = parent->coherent_dma_mask; 205 206 ret = regulator_bulk_register_supply_alias( 207 &pdev->dev, cell->parent_supplies, 208 parent, cell->parent_supplies, 209 cell->num_parent_supplies); 210 if (ret < 0) 211 goto fail_res; 212 213 if (IS_ENABLED(CONFIG_OF) && parent->of_node && cell->of_compatible) { 214 for_each_child_of_node(parent->of_node, np) { 215 if (of_device_is_compatible(np, cell->of_compatible)) { 216 /* Ignore 'disabled' devices error free */ 217 if (!of_device_is_available(np)) { 218 of_node_put(np); 219 ret = 0; 220 goto fail_alias; 221 } 222 223 ret = mfd_match_of_node_to_dev(pdev, np, cell); 224 if (ret == -EAGAIN) 225 continue; 226 of_node_put(np); 227 if (ret) 228 goto fail_alias; 229 230 break; 231 } 232 } 233 234 if (!pdev->dev.of_node) 235 pr_warn("%s: Failed to locate of_node [id: %d]\n", 236 cell->name, platform_id); 237 } 238 239 mfd_acpi_add_device(cell, pdev); 240 241 if (cell->pdata_size) { 242 ret = platform_device_add_data(pdev, 243 cell->platform_data, cell->pdata_size); 244 if (ret) 245 goto fail_of_entry; 246 } 247 248 if (cell->swnode) { 249 ret = device_add_software_node(&pdev->dev, cell->swnode); 250 if (ret) 251 goto fail_of_entry; 252 } 253 254 for (r = 0; r < cell->num_resources; r++) { 255 res[r].name = cell->resources[r].name; 256 res[r].flags = cell->resources[r].flags; 257 258 /* Find out base to use */ 259 if ((cell->resources[r].flags & IORESOURCE_MEM) && mem_base) { 260 res[r].parent = mem_base; 261 res[r].start = mem_base->start + 262 cell->resources[r].start; 263 res[r].end = mem_base->start + 264 cell->resources[r].end; 265 } else if (cell->resources[r].flags & IORESOURCE_IRQ) { 266 if (domain) { 267 /* Unable to create mappings for IRQ ranges. */ 268 WARN_ON(cell->resources[r].start != 269 cell->resources[r].end); 270 res[r].start = res[r].end = irq_create_mapping( 271 domain, cell->resources[r].start); 272 } else { 273 res[r].start = irq_base + 274 cell->resources[r].start; 275 res[r].end = irq_base + 276 cell->resources[r].end; 277 } 278 } else { 279 res[r].parent = cell->resources[r].parent; 280 res[r].start = cell->resources[r].start; 281 res[r].end = cell->resources[r].end; 282 } 283 284 if (!cell->ignore_resource_conflicts) { 285 if (has_acpi_companion(&pdev->dev)) { 286 ret = acpi_check_resource_conflict(&res[r]); 287 if (ret) 288 goto fail_res_conflict; 289 } 290 } 291 } 292 293 ret = platform_device_add_resources(pdev, res, cell->num_resources); 294 if (ret) 295 goto fail_res_conflict; 296 297 ret = platform_device_add(pdev); 298 if (ret) 299 goto fail_res_conflict; 300 301 if (cell->pm_runtime_no_callbacks) 302 pm_runtime_no_callbacks(&pdev->dev); 303 304 kfree(res); 305 306 return 0; 307 308 fail_res_conflict: 309 if (cell->swnode) 310 device_remove_software_node(&pdev->dev); 311 fail_of_entry: 312 list_for_each_entry_safe(of_entry, tmp, &mfd_of_node_list, list) 313 if (of_entry->dev == &pdev->dev) { 314 list_del(&of_entry->list); 315 kfree(of_entry); 316 } 317 fail_alias: 318 regulator_bulk_unregister_supply_alias(&pdev->dev, 319 cell->parent_supplies, 320 cell->num_parent_supplies); 321 fail_res: 322 kfree(res); 323 fail_device: 324 platform_device_put(pdev); 325 fail_alloc: 326 return ret; 327 } 328 329 /** 330 * mfd_add_devices - register child devices 331 * 332 * @parent: Pointer to parent device. 333 * @id: Can be PLATFORM_DEVID_AUTO to let the Platform API take care 334 * of device numbering, or will be added to a device's cell_id. 335 * @cells: Array of (struct mfd_cell)s describing child devices. 336 * @n_devs: Number of child devices to register. 337 * @mem_base: Parent register range resource for child devices. 338 * @irq_base: Base of the range of virtual interrupt numbers allocated for 339 * this MFD device. Unused if @domain is specified. 340 * @domain: Interrupt domain to create mappings for hardware interrupts. 341 */ 342 int mfd_add_devices(struct device *parent, int id, 343 const struct mfd_cell *cells, int n_devs, 344 struct resource *mem_base, 345 int irq_base, struct irq_domain *domain) 346 { 347 int i; 348 int ret; 349 350 for (i = 0; i < n_devs; i++) { 351 ret = mfd_add_device(parent, id, cells + i, mem_base, 352 irq_base, domain); 353 if (ret) 354 goto fail; 355 } 356 357 return 0; 358 359 fail: 360 if (i) 361 mfd_remove_devices(parent); 362 363 return ret; 364 } 365 EXPORT_SYMBOL(mfd_add_devices); 366 367 static int mfd_remove_devices_fn(struct device *dev, void *data) 368 { 369 struct platform_device *pdev; 370 const struct mfd_cell *cell; 371 int *level = data; 372 373 if (dev->type != &mfd_dev_type) 374 return 0; 375 376 pdev = to_platform_device(dev); 377 cell = mfd_get_cell(pdev); 378 379 if (level && cell->level > *level) 380 return 0; 381 382 if (cell->swnode) 383 device_remove_software_node(&pdev->dev); 384 385 regulator_bulk_unregister_supply_alias(dev, cell->parent_supplies, 386 cell->num_parent_supplies); 387 388 platform_device_unregister(pdev); 389 return 0; 390 } 391 392 void mfd_remove_devices_late(struct device *parent) 393 { 394 int level = MFD_DEP_LEVEL_HIGH; 395 396 device_for_each_child_reverse(parent, &level, mfd_remove_devices_fn); 397 } 398 EXPORT_SYMBOL(mfd_remove_devices_late); 399 400 void mfd_remove_devices(struct device *parent) 401 { 402 int level = MFD_DEP_LEVEL_NORMAL; 403 404 device_for_each_child_reverse(parent, &level, mfd_remove_devices_fn); 405 } 406 EXPORT_SYMBOL(mfd_remove_devices); 407 408 static void devm_mfd_dev_release(struct device *dev, void *res) 409 { 410 mfd_remove_devices(dev); 411 } 412 413 /** 414 * devm_mfd_add_devices - Resource managed version of mfd_add_devices() 415 * 416 * Returns 0 on success or an appropriate negative error number on failure. 417 * All child-devices of the MFD will automatically be removed when it gets 418 * unbinded. 419 * 420 * @dev: Pointer to parent device. 421 * @id: Can be PLATFORM_DEVID_AUTO to let the Platform API take care 422 * of device numbering, or will be added to a device's cell_id. 423 * @cells: Array of (struct mfd_cell)s describing child devices. 424 * @n_devs: Number of child devices to register. 425 * @mem_base: Parent register range resource for child devices. 426 * @irq_base: Base of the range of virtual interrupt numbers allocated for 427 * this MFD device. Unused if @domain is specified. 428 * @domain: Interrupt domain to create mappings for hardware interrupts. 429 */ 430 int devm_mfd_add_devices(struct device *dev, int id, 431 const struct mfd_cell *cells, int n_devs, 432 struct resource *mem_base, 433 int irq_base, struct irq_domain *domain) 434 { 435 struct device **ptr; 436 int ret; 437 438 ptr = devres_alloc(devm_mfd_dev_release, sizeof(*ptr), GFP_KERNEL); 439 if (!ptr) 440 return -ENOMEM; 441 442 ret = mfd_add_devices(dev, id, cells, n_devs, mem_base, 443 irq_base, domain); 444 if (ret < 0) { 445 devres_free(ptr); 446 return ret; 447 } 448 449 *ptr = dev; 450 devres_add(dev, ptr); 451 452 return ret; 453 } 454 EXPORT_SYMBOL(devm_mfd_add_devices); 455 456 MODULE_LICENSE("GPL"); 457 MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov"); 458