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Dmitry Baryshkovaa613de2008-06-27 10:37:19 +01001/*
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>
Samuel Ortiz91feded2010-02-19 11:07:59 +010016#include <linux/acpi.h>
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +010017#include <linux/mfd/core.h>
Mark Brown4c90aa92010-11-26 17:19:34 +000018#include <linux/pm_runtime.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090019#include <linux/slab.h>
Paul Gortmaker4e36dd32011-07-03 15:13:27 -040020#include <linux/module.h>
Lee Jonesc94bb232012-06-29 19:01:03 +020021#include <linux/irqdomain.h>
22#include <linux/of.h>
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +010023
Charles Keepaxb9fbb622012-11-09 16:15:28 +000024static struct device_type mfd_dev_type = {
25 .name = "mfd_device",
26};
27
Andres Salomonf77289a2011-03-03 09:51:58 -080028int mfd_cell_enable(struct platform_device *pdev)
Andres Salomon1e29af62011-02-17 19:07:34 -080029{
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}
Andres Salomonf77289a2011-03-03 09:51:58 -080043EXPORT_SYMBOL(mfd_cell_enable);
Andres Salomon1e29af62011-02-17 19:07:34 -080044
Andres Salomonf77289a2011-03-03 09:51:58 -080045int mfd_cell_disable(struct platform_device *pdev)
Andres Salomon1e29af62011-02-17 19:07:34 -080046{
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}
Andres Salomonf77289a2011-03-03 09:51:58 -080063EXPORT_SYMBOL(mfd_cell_disable);
Andres Salomon1e29af62011-02-17 19:07:34 -080064
Samuel Ortize710d7d2011-04-08 00:43:01 +020065static 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
Dmitry Baryshkov424f5252008-07-29 01:30:26 +020078static int mfd_add_device(struct device *parent, int id,
Ben Dooks7f71ac92008-07-28 18:29:09 +020079 const struct mfd_cell *cell,
80 struct resource *mem_base,
Mark Brown0848c942012-09-11 15:16:36 +080081 int irq_base, struct irq_domain *domain)
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +010082{
Ian Moltona87903f2008-07-25 22:59:29 +010083 struct resource *res;
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +010084 struct platform_device *pdev;
Lee Jonesc94bb232012-06-29 19:01:03 +020085 struct device_node *np = NULL;
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +010086 int ret = -ENOMEM;
87 int r;
88
Mark Brown3bed6e42009-07-27 14:45:51 +010089 pdev = platform_device_alloc(cell->name, id + cell->id);
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +010090 if (!pdev)
91 goto fail_alloc;
92
Ian Moltona87903f2008-07-25 22:59:29 +010093 res = kzalloc(sizeof(*res) * cell->num_resources, GFP_KERNEL);
94 if (!res)
95 goto fail_device;
96
Dmitry Baryshkov424f5252008-07-29 01:30:26 +020097 pdev->dev.parent = parent;
Charles Keepaxb9fbb622012-11-09 16:15:28 +000098 pdev->dev.type = &mfd_dev_type;
Benedikt Sprangerb018e132013-08-13 11:08:38 +020099 pdev->dev.dma_mask = parent->dma_mask;
100 pdev->dev.dma_parms = parent->dma_parms;
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +0100101
Lee Jonesc94bb232012-06-29 19:01:03 +0200102 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;
Lee Jonesc94bb232012-06-29 19:01:03 +0200106 break;
107 }
108 }
109 }
110
Samuel Ortizeb895602011-04-06 16:52:52 +0200111 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
Samuel Ortize710d7d2011-04-08 00:43:01 +0200118 ret = mfd_platform_add_cell(pdev, cell);
Andres Salomonfe891a02011-02-17 19:07:09 -0800119 if (ret)
120 goto fail_res;
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +0100121
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +0100122 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 */
Samuel Ortizf03cfcb2010-03-26 01:09:04 +0100127 if ((cell->resources[r].flags & IORESOURCE_MEM) && mem_base) {
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +0100128 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) {
Lee Jonesc94bb232012-06-29 19:01:03 +0200134 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 }
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +0100146 } 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 }
Samuel Ortiz91feded2010-02-19 11:07:59 +0100151
Daniel Drake5f2545f2010-09-30 21:55:36 +0100152 if (!cell->ignore_resource_conflicts) {
Jean Delvare855cc452012-02-18 17:54:23 +0100153 ret = acpi_check_resource_conflict(&res[r]);
Daniel Drake5f2545f2010-09-30 21:55:36 +0100154 if (ret)
155 goto fail_res;
156 }
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +0100157 }
158
Axel Lin8af5fe32010-05-31 17:30:55 +0800159 ret = platform_device_add_resources(pdev, res, cell->num_resources);
160 if (ret)
161 goto fail_res;
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +0100162
163 ret = platform_device_add(pdev);
164 if (ret)
Ian Moltona87903f2008-07-25 22:59:29 +0100165 goto fail_res;
166
Mark Brown4c90aa92010-11-26 17:19:34 +0000167 if (cell->pm_runtime_no_callbacks)
168 pm_runtime_no_callbacks(&pdev->dev);
169
Ian Moltona87903f2008-07-25 22:59:29 +0100170 kfree(res);
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +0100171
172 return 0;
173
Ian Moltona87903f2008-07-25 22:59:29 +0100174fail_res:
175 kfree(res);
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +0100176fail_device:
177 platform_device_put(pdev);
178fail_alloc:
179 return ret;
180}
181
Dmitry Baryshkov424f5252008-07-29 01:30:26 +0200182int mfd_add_devices(struct device *parent, int id,
Andres Salomon1e29af62011-02-17 19:07:34 -0800183 struct mfd_cell *cells, int n_devs,
Ben Dooks7f71ac92008-07-28 18:29:09 +0200184 struct resource *mem_base,
Mark Brown0848c942012-09-11 15:16:36 +0800185 int irq_base, struct irq_domain *domain)
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +0100186{
187 int i;
188 int ret = 0;
Andres Salomon1e29af62011-02-17 19:07:34 -0800189 atomic_t *cnts;
190
191 /* initialize reference counting for all cells */
Axel Lind1b5c5e2012-02-12 17:43:22 +0800192 cnts = kcalloc(n_devs, sizeof(*cnts), GFP_KERNEL);
Andres Salomon1e29af62011-02-17 19:07:34 -0800193 if (!cnts)
194 return -ENOMEM;
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +0100195
196 for (i = 0; i < n_devs; i++) {
Andres Salomon1e29af62011-02-17 19:07:34 -0800197 atomic_set(&cnts[i], 0);
198 cells[i].usage_count = &cnts[i];
Mark Brown0848c942012-09-11 15:16:36 +0800199 ret = mfd_add_device(parent, id, cells + i, mem_base,
200 irq_base, domain);
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +0100201 if (ret)
202 break;
203 }
204
205 if (ret)
206 mfd_remove_devices(parent);
207
208 return ret;
209}
210EXPORT_SYMBOL(mfd_add_devices);
211
Andres Salomon1e29af62011-02-17 19:07:34 -0800212static int mfd_remove_devices_fn(struct device *dev, void *c)
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +0100213{
Charles Keepaxb9fbb622012-11-09 16:15:28 +0000214 struct platform_device *pdev;
215 const struct mfd_cell *cell;
Andres Salomon1e29af62011-02-17 19:07:34 -0800216 atomic_t **usage_count = c;
217
Charles Keepaxb9fbb622012-11-09 16:15:28 +0000218 if (dev->type != &mfd_dev_type)
219 return 0;
220
221 pdev = to_platform_device(dev);
222 cell = mfd_get_cell(pdev);
223
Andres Salomon1e29af62011-02-17 19:07:34 -0800224 /* 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);
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +0100229 return 0;
230}
231
Dmitry Baryshkov424f5252008-07-29 01:30:26 +0200232void mfd_remove_devices(struct device *parent)
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +0100233{
Andres Salomon1e29af62011-02-17 19:07:34 -0800234 atomic_t *cnts = NULL;
235
236 device_for_each_child(parent, &cnts, mfd_remove_devices_fn);
237 kfree(cnts);
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +0100238}
239EXPORT_SYMBOL(mfd_remove_devices);
240
Andres Salomonfa1df692011-03-21 19:19:35 -0700241int mfd_clone_cell(const char *cell, const char **clones, size_t n_clones)
Andres Salomona9bbba92011-02-17 19:07:35 -0800242{
243 struct mfd_cell cell_entry;
244 struct device *dev;
245 struct platform_device *pdev;
Andres Salomonfa1df692011-03-21 19:19:35 -0700246 int i;
Andres Salomona9bbba92011-02-17 19:07:35 -0800247
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
Andres Salomonfa1df692011-03-21 19:19:35 -0700259 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 */
Mark Brown0848c942012-09-11 15:16:36 +0800262 if (mfd_add_device(pdev->dev.parent, -1, &cell_entry, NULL, 0,
263 NULL))
Andres Salomonfa1df692011-03-21 19:19:35 -0700264 dev_err(dev, "failed to create platform device '%s'\n",
265 clones[i]);
266 }
267
268 return 0;
Andres Salomona9bbba92011-02-17 19:07:35 -0800269}
Andres Salomonfa1df692011-03-21 19:19:35 -0700270EXPORT_SYMBOL(mfd_clone_cell);
Andres Salomona9bbba92011-02-17 19:07:35 -0800271
Dmitry Baryshkovaa613de2008-06-27 10:37:19 +0100272MODULE_LICENSE("GPL");
273MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov");