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Commit | Line | Data |
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aa613de6 DES |
1 | /* |
2 | * drivers/mfd/mfd-core.c | |
3 | * | |
4 | * core MFD support | |
5 | * Copyright (c) 2006 Ian Molton | |
6 | * Copyright (c) 2007,2008 Dmitry Baryshkov | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | * | |
12 | */ | |
13 | ||
14 | #include <linux/kernel.h> | |
15 | #include <linux/platform_device.h> | |
91fedede | 16 | #include <linux/acpi.h> |
aa613de6 | 17 | #include <linux/mfd/core.h> |
4c90aa94 | 18 | #include <linux/pm_runtime.h> |
5a0e3ad6 | 19 | #include <linux/slab.h> |
4e36dd33 | 20 | #include <linux/module.h> |
c94bb233 LJ |
21 | #include <linux/irqdomain.h> |
22 | #include <linux/of.h> | |
aa613de6 | 23 | |
b9fbb62e CK |
24 | static struct device_type mfd_dev_type = { |
25 | .name = "mfd_device", | |
26 | }; | |
27 | ||
f77289ac | 28 | int mfd_cell_enable(struct platform_device *pdev) |
1e29af62 AS |
29 | { |
30 | const struct mfd_cell *cell = mfd_get_cell(pdev); | |
31 | int err = 0; | |
32 | ||
33 | /* only call enable hook if the cell wasn't previously enabled */ | |
34 | if (atomic_inc_return(cell->usage_count) == 1) | |
35 | err = cell->enable(pdev); | |
36 | ||
37 | /* if the enable hook failed, decrement counter to allow retries */ | |
38 | if (err) | |
39 | atomic_dec(cell->usage_count); | |
40 | ||
41 | return err; | |
42 | } | |
f77289ac | 43 | EXPORT_SYMBOL(mfd_cell_enable); |
1e29af62 | 44 | |
f77289ac | 45 | int mfd_cell_disable(struct platform_device *pdev) |
1e29af62 AS |
46 | { |
47 | const struct mfd_cell *cell = mfd_get_cell(pdev); | |
48 | int err = 0; | |
49 | ||
50 | /* only disable if no other clients are using it */ | |
51 | if (atomic_dec_return(cell->usage_count) == 0) | |
52 | err = cell->disable(pdev); | |
53 | ||
54 | /* if the disable hook failed, increment to allow retries */ | |
55 | if (err) | |
56 | atomic_inc(cell->usage_count); | |
57 | ||
58 | /* sanity check; did someone call disable too many times? */ | |
59 | WARN_ON(atomic_read(cell->usage_count) < 0); | |
60 | ||
61 | return err; | |
62 | } | |
f77289ac | 63 | EXPORT_SYMBOL(mfd_cell_disable); |
1e29af62 | 64 | |
e710d7d5 SO |
65 | static int mfd_platform_add_cell(struct platform_device *pdev, |
66 | const struct mfd_cell *cell) | |
67 | { | |
68 | if (!cell) | |
69 | return 0; | |
70 | ||
71 | pdev->mfd_cell = kmemdup(cell, sizeof(*cell), GFP_KERNEL); | |
72 | if (!pdev->mfd_cell) | |
73 | return -ENOMEM; | |
74 | ||
75 | return 0; | |
76 | } | |
77 | ||
424f525a | 78 | static int mfd_add_device(struct device *parent, int id, |
7f71ac93 BD |
79 | const struct mfd_cell *cell, |
80 | struct resource *mem_base, | |
0848c94f | 81 | int irq_base, struct irq_domain *domain) |
aa613de6 | 82 | { |
a87903f3 | 83 | struct resource *res; |
aa613de6 | 84 | struct platform_device *pdev; |
c94bb233 | 85 | struct device_node *np = NULL; |
aa613de6 DES |
86 | int ret = -ENOMEM; |
87 | int r; | |
88 | ||
3bed6e41 | 89 | pdev = platform_device_alloc(cell->name, id + cell->id); |
aa613de6 DES |
90 | if (!pdev) |
91 | goto fail_alloc; | |
92 | ||
a87903f3 IM |
93 | res = kzalloc(sizeof(*res) * cell->num_resources, GFP_KERNEL); |
94 | if (!res) | |
95 | goto fail_device; | |
96 | ||
424f525a | 97 | pdev->dev.parent = parent; |
b9fbb62e | 98 | pdev->dev.type = &mfd_dev_type; |
b018e136 BS |
99 | pdev->dev.dma_mask = parent->dma_mask; |
100 | pdev->dev.dma_parms = parent->dma_parms; | |
aa613de6 | 101 | |
c94bb233 LJ |
102 | if (parent->of_node && cell->of_compatible) { |
103 | for_each_child_of_node(parent->of_node, np) { | |
104 | if (of_device_is_compatible(np, cell->of_compatible)) { | |
105 | pdev->dev.of_node = np; | |
c94bb233 LJ |
106 | break; |
107 | } | |
108 | } | |
109 | } | |
110 | ||
eb895607 SO |
111 | if (cell->pdata_size) { |
112 | ret = platform_device_add_data(pdev, | |
113 | cell->platform_data, cell->pdata_size); | |
114 | if (ret) | |
115 | goto fail_res; | |
116 | } | |
117 | ||
e710d7d5 | 118 | ret = mfd_platform_add_cell(pdev, cell); |
fe891a00 AS |
119 | if (ret) |
120 | goto fail_res; | |
aa613de6 | 121 | |
aa613de6 DES |
122 | for (r = 0; r < cell->num_resources; r++) { |
123 | res[r].name = cell->resources[r].name; | |
124 | res[r].flags = cell->resources[r].flags; | |
125 | ||
126 | /* Find out base to use */ | |
f03cfcbc | 127 | if ((cell->resources[r].flags & IORESOURCE_MEM) && mem_base) { |
aa613de6 DES |
128 | res[r].parent = mem_base; |
129 | res[r].start = mem_base->start + | |
130 | cell->resources[r].start; | |
131 | res[r].end = mem_base->start + | |
132 | cell->resources[r].end; | |
133 | } else if (cell->resources[r].flags & IORESOURCE_IRQ) { | |
c94bb233 LJ |
134 | if (domain) { |
135 | /* Unable to create mappings for IRQ ranges. */ | |
136 | WARN_ON(cell->resources[r].start != | |
137 | cell->resources[r].end); | |
138 | res[r].start = res[r].end = irq_create_mapping( | |
139 | domain, cell->resources[r].start); | |
140 | } else { | |
141 | res[r].start = irq_base + | |
142 | cell->resources[r].start; | |
143 | res[r].end = irq_base + | |
144 | cell->resources[r].end; | |
145 | } | |
aa613de6 DES |
146 | } else { |
147 | res[r].parent = cell->resources[r].parent; | |
148 | res[r].start = cell->resources[r].start; | |
149 | res[r].end = cell->resources[r].end; | |
150 | } | |
91fedede | 151 | |
5f2545fa | 152 | if (!cell->ignore_resource_conflicts) { |
855cc454 | 153 | ret = acpi_check_resource_conflict(&res[r]); |
5f2545fa DD |
154 | if (ret) |
155 | goto fail_res; | |
156 | } | |
aa613de6 DES |
157 | } |
158 | ||
8af5fe3b AL |
159 | ret = platform_device_add_resources(pdev, res, cell->num_resources); |
160 | if (ret) | |
161 | goto fail_res; | |
aa613de6 DES |
162 | |
163 | ret = platform_device_add(pdev); | |
164 | if (ret) | |
a87903f3 IM |
165 | goto fail_res; |
166 | ||
4c90aa94 MB |
167 | if (cell->pm_runtime_no_callbacks) |
168 | pm_runtime_no_callbacks(&pdev->dev); | |
169 | ||
a87903f3 | 170 | kfree(res); |
aa613de6 DES |
171 | |
172 | return 0; | |
173 | ||
a87903f3 IM |
174 | fail_res: |
175 | kfree(res); | |
aa613de6 DES |
176 | fail_device: |
177 | platform_device_put(pdev); | |
178 | fail_alloc: | |
179 | return ret; | |
180 | } | |
181 | ||
424f525a | 182 | int mfd_add_devices(struct device *parent, int id, |
1e29af62 | 183 | struct mfd_cell *cells, int n_devs, |
7f71ac93 | 184 | struct resource *mem_base, |
0848c94f | 185 | int irq_base, struct irq_domain *domain) |
aa613de6 DES |
186 | { |
187 | int i; | |
188 | int ret = 0; | |
1e29af62 AS |
189 | atomic_t *cnts; |
190 | ||
191 | /* initialize reference counting for all cells */ | |
d1b5c5e2 | 192 | cnts = kcalloc(n_devs, sizeof(*cnts), GFP_KERNEL); |
1e29af62 AS |
193 | if (!cnts) |
194 | return -ENOMEM; | |
aa613de6 DES |
195 | |
196 | for (i = 0; i < n_devs; i++) { | |
1e29af62 AS |
197 | atomic_set(&cnts[i], 0); |
198 | cells[i].usage_count = &cnts[i]; | |
0848c94f MB |
199 | ret = mfd_add_device(parent, id, cells + i, mem_base, |
200 | irq_base, domain); | |
aa613de6 DES |
201 | if (ret) |
202 | break; | |
203 | } | |
204 | ||
205 | if (ret) | |
206 | mfd_remove_devices(parent); | |
207 | ||
208 | return ret; | |
209 | } | |
210 | EXPORT_SYMBOL(mfd_add_devices); | |
211 | ||
1e29af62 | 212 | static int mfd_remove_devices_fn(struct device *dev, void *c) |
aa613de6 | 213 | { |
b9fbb62e CK |
214 | struct platform_device *pdev; |
215 | const struct mfd_cell *cell; | |
1e29af62 AS |
216 | atomic_t **usage_count = c; |
217 | ||
b9fbb62e CK |
218 | if (dev->type != &mfd_dev_type) |
219 | return 0; | |
220 | ||
221 | pdev = to_platform_device(dev); | |
222 | cell = mfd_get_cell(pdev); | |
223 | ||
1e29af62 AS |
224 | /* find the base address of usage_count pointers (for freeing) */ |
225 | if (!*usage_count || (cell->usage_count < *usage_count)) | |
226 | *usage_count = cell->usage_count; | |
227 | ||
228 | platform_device_unregister(pdev); | |
aa613de6 DES |
229 | return 0; |
230 | } | |
231 | ||
424f525a | 232 | void mfd_remove_devices(struct device *parent) |
aa613de6 | 233 | { |
1e29af62 AS |
234 | atomic_t *cnts = NULL; |
235 | ||
236 | device_for_each_child(parent, &cnts, mfd_remove_devices_fn); | |
237 | kfree(cnts); | |
aa613de6 DES |
238 | } |
239 | EXPORT_SYMBOL(mfd_remove_devices); | |
240 | ||
fa1df691 | 241 | int mfd_clone_cell(const char *cell, const char **clones, size_t n_clones) |
a9bbba99 AS |
242 | { |
243 | struct mfd_cell cell_entry; | |
244 | struct device *dev; | |
245 | struct platform_device *pdev; | |
fa1df691 | 246 | int i; |
a9bbba99 AS |
247 | |
248 | /* fetch the parent cell's device (should already be registered!) */ | |
249 | dev = bus_find_device_by_name(&platform_bus_type, NULL, cell); | |
250 | if (!dev) { | |
251 | printk(KERN_ERR "failed to find device for cell %s\n", cell); | |
252 | return -ENODEV; | |
253 | } | |
254 | pdev = to_platform_device(dev); | |
255 | memcpy(&cell_entry, mfd_get_cell(pdev), sizeof(cell_entry)); | |
256 | ||
257 | WARN_ON(!cell_entry.enable); | |
258 | ||
fa1df691 AS |
259 | for (i = 0; i < n_clones; i++) { |
260 | cell_entry.name = clones[i]; | |
261 | /* don't give up if a single call fails; just report error */ | |
0848c94f MB |
262 | if (mfd_add_device(pdev->dev.parent, -1, &cell_entry, NULL, 0, |
263 | NULL)) | |
fa1df691 AS |
264 | dev_err(dev, "failed to create platform device '%s'\n", |
265 | clones[i]); | |
266 | } | |
a9bbba99 | 267 | |
fa1df691 | 268 | return 0; |
a9bbba99 | 269 | } |
fa1df691 | 270 | EXPORT_SYMBOL(mfd_clone_cell); |
a9bbba99 | 271 | |
aa613de6 DES |
272 | MODULE_LICENSE("GPL"); |
273 | MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov"); |