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