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