Dmitry Baryshkov | aa613de | 2008-06-27 10:37:19 +0100 | [diff] [blame] | 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> |
Samuel Ortiz | 91feded | 2010-02-19 11:07:59 +0100 | [diff] [blame] | 16 | #include <linux/acpi.h> |
Dmitry Baryshkov | aa613de | 2008-06-27 10:37:19 +0100 | [diff] [blame] | 17 | #include <linux/mfd/core.h> |
Mark Brown | 4c90aa9 | 2010-11-26 17:19:34 +0000 | [diff] [blame] | 18 | #include <linux/pm_runtime.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 19 | #include <linux/slab.h> |
Paul Gortmaker | 4e36dd3 | 2011-07-03 15:13:27 -0400 | [diff] [blame] | 20 | #include <linux/module.h> |
Lee Jones | c94bb23 | 2012-06-29 19:01:03 +0200 | [diff] [blame] | 21 | #include <linux/irqdomain.h> |
| 22 | #include <linux/of.h> |
Dmitry Baryshkov | aa613de | 2008-06-27 10:37:19 +0100 | [diff] [blame] | 23 | |
Charles Keepax | b9fbb62 | 2012-11-09 16:15:28 +0000 | [diff] [blame] | 24 | static struct device_type mfd_dev_type = { |
| 25 | .name = "mfd_device", |
| 26 | }; |
| 27 | |
Andres Salomon | f77289a | 2011-03-03 09:51:58 -0800 | [diff] [blame] | 28 | int mfd_cell_enable(struct platform_device *pdev) |
Andres Salomon | 1e29af6 | 2011-02-17 19:07:34 -0800 | [diff] [blame] | 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 | } |
Andres Salomon | f77289a | 2011-03-03 09:51:58 -0800 | [diff] [blame] | 43 | EXPORT_SYMBOL(mfd_cell_enable); |
Andres Salomon | 1e29af6 | 2011-02-17 19:07:34 -0800 | [diff] [blame] | 44 | |
Andres Salomon | f77289a | 2011-03-03 09:51:58 -0800 | [diff] [blame] | 45 | int mfd_cell_disable(struct platform_device *pdev) |
Andres Salomon | 1e29af6 | 2011-02-17 19:07:34 -0800 | [diff] [blame] | 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 | } |
Andres Salomon | f77289a | 2011-03-03 09:51:58 -0800 | [diff] [blame] | 63 | EXPORT_SYMBOL(mfd_cell_disable); |
Andres Salomon | 1e29af6 | 2011-02-17 19:07:34 -0800 | [diff] [blame] | 64 | |
Samuel Ortiz | e710d7d | 2011-04-08 00:43:01 +0200 | [diff] [blame] | 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 | |
Dmitry Baryshkov | 424f525 | 2008-07-29 01:30:26 +0200 | [diff] [blame] | 78 | static int mfd_add_device(struct device *parent, int id, |
Ben Dooks | 7f71ac9 | 2008-07-28 18:29:09 +0200 | [diff] [blame] | 79 | const struct mfd_cell *cell, |
| 80 | struct resource *mem_base, |
Mark Brown | 0848c94 | 2012-09-11 15:16:36 +0800 | [diff] [blame] | 81 | int irq_base, struct irq_domain *domain) |
Dmitry Baryshkov | aa613de | 2008-06-27 10:37:19 +0100 | [diff] [blame] | 82 | { |
Ian Molton | a87903f | 2008-07-25 22:59:29 +0100 | [diff] [blame] | 83 | struct resource *res; |
Dmitry Baryshkov | aa613de | 2008-06-27 10:37:19 +0100 | [diff] [blame] | 84 | struct platform_device *pdev; |
Lee Jones | c94bb23 | 2012-06-29 19:01:03 +0200 | [diff] [blame] | 85 | struct device_node *np = NULL; |
Dmitry Baryshkov | aa613de | 2008-06-27 10:37:19 +0100 | [diff] [blame] | 86 | int ret = -ENOMEM; |
| 87 | int r; |
| 88 | |
Mark Brown | 3bed6e4 | 2009-07-27 14:45:51 +0100 | [diff] [blame] | 89 | pdev = platform_device_alloc(cell->name, id + cell->id); |
Dmitry Baryshkov | aa613de | 2008-06-27 10:37:19 +0100 | [diff] [blame] | 90 | if (!pdev) |
| 91 | goto fail_alloc; |
| 92 | |
Ian Molton | a87903f | 2008-07-25 22:59:29 +0100 | [diff] [blame] | 93 | res = kzalloc(sizeof(*res) * cell->num_resources, GFP_KERNEL); |
| 94 | if (!res) |
| 95 | goto fail_device; |
| 96 | |
Dmitry Baryshkov | 424f525 | 2008-07-29 01:30:26 +0200 | [diff] [blame] | 97 | pdev->dev.parent = parent; |
Charles Keepax | b9fbb62 | 2012-11-09 16:15:28 +0000 | [diff] [blame] | 98 | pdev->dev.type = &mfd_dev_type; |
Benedikt Spranger | b018e13 | 2013-08-13 11:08:38 +0200 | [diff] [blame] | 99 | pdev->dev.dma_mask = parent->dma_mask; |
| 100 | pdev->dev.dma_parms = parent->dma_parms; |
Dmitry Baryshkov | aa613de | 2008-06-27 10:37:19 +0100 | [diff] [blame] | 101 | |
Lee Jones | c94bb23 | 2012-06-29 19:01:03 +0200 | [diff] [blame] | 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; |
Lee Jones | c94bb23 | 2012-06-29 19:01:03 +0200 | [diff] [blame] | 106 | break; |
| 107 | } |
| 108 | } |
| 109 | } |
| 110 | |
Samuel Ortiz | eb89560 | 2011-04-06 16:52:52 +0200 | [diff] [blame] | 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 | |
Samuel Ortiz | e710d7d | 2011-04-08 00:43:01 +0200 | [diff] [blame] | 118 | ret = mfd_platform_add_cell(pdev, cell); |
Andres Salomon | fe891a0 | 2011-02-17 19:07:09 -0800 | [diff] [blame] | 119 | if (ret) |
| 120 | goto fail_res; |
Dmitry Baryshkov | aa613de | 2008-06-27 10:37:19 +0100 | [diff] [blame] | 121 | |
Dmitry Baryshkov | aa613de | 2008-06-27 10:37:19 +0100 | [diff] [blame] | 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 */ |
Samuel Ortiz | f03cfcb | 2010-03-26 01:09:04 +0100 | [diff] [blame] | 127 | if ((cell->resources[r].flags & IORESOURCE_MEM) && mem_base) { |
Dmitry Baryshkov | aa613de | 2008-06-27 10:37:19 +0100 | [diff] [blame] | 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) { |
Lee Jones | c94bb23 | 2012-06-29 19:01:03 +0200 | [diff] [blame] | 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 | } |
Dmitry Baryshkov | aa613de | 2008-06-27 10:37:19 +0100 | [diff] [blame] | 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 | } |
Samuel Ortiz | 91feded | 2010-02-19 11:07:59 +0100 | [diff] [blame] | 151 | |
Daniel Drake | 5f2545f | 2010-09-30 21:55:36 +0100 | [diff] [blame] | 152 | if (!cell->ignore_resource_conflicts) { |
Jean Delvare | 855cc45 | 2012-02-18 17:54:23 +0100 | [diff] [blame] | 153 | ret = acpi_check_resource_conflict(&res[r]); |
Daniel Drake | 5f2545f | 2010-09-30 21:55:36 +0100 | [diff] [blame] | 154 | if (ret) |
| 155 | goto fail_res; |
| 156 | } |
Dmitry Baryshkov | aa613de | 2008-06-27 10:37:19 +0100 | [diff] [blame] | 157 | } |
| 158 | |
Axel Lin | 8af5fe3 | 2010-05-31 17:30:55 +0800 | [diff] [blame] | 159 | ret = platform_device_add_resources(pdev, res, cell->num_resources); |
| 160 | if (ret) |
| 161 | goto fail_res; |
Dmitry Baryshkov | aa613de | 2008-06-27 10:37:19 +0100 | [diff] [blame] | 162 | |
| 163 | ret = platform_device_add(pdev); |
| 164 | if (ret) |
Ian Molton | a87903f | 2008-07-25 22:59:29 +0100 | [diff] [blame] | 165 | goto fail_res; |
| 166 | |
Mark Brown | 4c90aa9 | 2010-11-26 17:19:34 +0000 | [diff] [blame] | 167 | if (cell->pm_runtime_no_callbacks) |
| 168 | pm_runtime_no_callbacks(&pdev->dev); |
| 169 | |
Ian Molton | a87903f | 2008-07-25 22:59:29 +0100 | [diff] [blame] | 170 | kfree(res); |
Dmitry Baryshkov | aa613de | 2008-06-27 10:37:19 +0100 | [diff] [blame] | 171 | |
| 172 | return 0; |
| 173 | |
Ian Molton | a87903f | 2008-07-25 22:59:29 +0100 | [diff] [blame] | 174 | fail_res: |
| 175 | kfree(res); |
Dmitry Baryshkov | aa613de | 2008-06-27 10:37:19 +0100 | [diff] [blame] | 176 | fail_device: |
| 177 | platform_device_put(pdev); |
| 178 | fail_alloc: |
| 179 | return ret; |
| 180 | } |
| 181 | |
Dmitry Baryshkov | 424f525 | 2008-07-29 01:30:26 +0200 | [diff] [blame] | 182 | int mfd_add_devices(struct device *parent, int id, |
Andres Salomon | 1e29af6 | 2011-02-17 19:07:34 -0800 | [diff] [blame] | 183 | struct mfd_cell *cells, int n_devs, |
Ben Dooks | 7f71ac9 | 2008-07-28 18:29:09 +0200 | [diff] [blame] | 184 | struct resource *mem_base, |
Mark Brown | 0848c94 | 2012-09-11 15:16:36 +0800 | [diff] [blame] | 185 | int irq_base, struct irq_domain *domain) |
Dmitry Baryshkov | aa613de | 2008-06-27 10:37:19 +0100 | [diff] [blame] | 186 | { |
| 187 | int i; |
| 188 | int ret = 0; |
Andres Salomon | 1e29af6 | 2011-02-17 19:07:34 -0800 | [diff] [blame] | 189 | atomic_t *cnts; |
| 190 | |
| 191 | /* initialize reference counting for all cells */ |
Axel Lin | d1b5c5e | 2012-02-12 17:43:22 +0800 | [diff] [blame] | 192 | cnts = kcalloc(n_devs, sizeof(*cnts), GFP_KERNEL); |
Andres Salomon | 1e29af6 | 2011-02-17 19:07:34 -0800 | [diff] [blame] | 193 | if (!cnts) |
| 194 | return -ENOMEM; |
Dmitry Baryshkov | aa613de | 2008-06-27 10:37:19 +0100 | [diff] [blame] | 195 | |
| 196 | for (i = 0; i < n_devs; i++) { |
Andres Salomon | 1e29af6 | 2011-02-17 19:07:34 -0800 | [diff] [blame] | 197 | atomic_set(&cnts[i], 0); |
| 198 | cells[i].usage_count = &cnts[i]; |
Mark Brown | 0848c94 | 2012-09-11 15:16:36 +0800 | [diff] [blame] | 199 | ret = mfd_add_device(parent, id, cells + i, mem_base, |
| 200 | irq_base, domain); |
Dmitry Baryshkov | aa613de | 2008-06-27 10:37:19 +0100 | [diff] [blame] | 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 | |
Andres Salomon | 1e29af6 | 2011-02-17 19:07:34 -0800 | [diff] [blame] | 212 | static int mfd_remove_devices_fn(struct device *dev, void *c) |
Dmitry Baryshkov | aa613de | 2008-06-27 10:37:19 +0100 | [diff] [blame] | 213 | { |
Charles Keepax | b9fbb62 | 2012-11-09 16:15:28 +0000 | [diff] [blame] | 214 | struct platform_device *pdev; |
| 215 | const struct mfd_cell *cell; |
Andres Salomon | 1e29af6 | 2011-02-17 19:07:34 -0800 | [diff] [blame] | 216 | atomic_t **usage_count = c; |
| 217 | |
Charles Keepax | b9fbb62 | 2012-11-09 16:15:28 +0000 | [diff] [blame] | 218 | if (dev->type != &mfd_dev_type) |
| 219 | return 0; |
| 220 | |
| 221 | pdev = to_platform_device(dev); |
| 222 | cell = mfd_get_cell(pdev); |
| 223 | |
Andres Salomon | 1e29af6 | 2011-02-17 19:07:34 -0800 | [diff] [blame] | 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); |
Dmitry Baryshkov | aa613de | 2008-06-27 10:37:19 +0100 | [diff] [blame] | 229 | return 0; |
| 230 | } |
| 231 | |
Dmitry Baryshkov | 424f525 | 2008-07-29 01:30:26 +0200 | [diff] [blame] | 232 | void mfd_remove_devices(struct device *parent) |
Dmitry Baryshkov | aa613de | 2008-06-27 10:37:19 +0100 | [diff] [blame] | 233 | { |
Andres Salomon | 1e29af6 | 2011-02-17 19:07:34 -0800 | [diff] [blame] | 234 | atomic_t *cnts = NULL; |
| 235 | |
| 236 | device_for_each_child(parent, &cnts, mfd_remove_devices_fn); |
| 237 | kfree(cnts); |
Dmitry Baryshkov | aa613de | 2008-06-27 10:37:19 +0100 | [diff] [blame] | 238 | } |
| 239 | EXPORT_SYMBOL(mfd_remove_devices); |
| 240 | |
Andres Salomon | fa1df69 | 2011-03-21 19:19:35 -0700 | [diff] [blame] | 241 | int mfd_clone_cell(const char *cell, const char **clones, size_t n_clones) |
Andres Salomon | a9bbba9 | 2011-02-17 19:07:35 -0800 | [diff] [blame] | 242 | { |
| 243 | struct mfd_cell cell_entry; |
| 244 | struct device *dev; |
| 245 | struct platform_device *pdev; |
Andres Salomon | fa1df69 | 2011-03-21 19:19:35 -0700 | [diff] [blame] | 246 | int i; |
Andres Salomon | a9bbba9 | 2011-02-17 19:07:35 -0800 | [diff] [blame] | 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 | |
Andres Salomon | fa1df69 | 2011-03-21 19:19:35 -0700 | [diff] [blame] | 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 */ |
Mark Brown | 0848c94 | 2012-09-11 15:16:36 +0800 | [diff] [blame] | 262 | if (mfd_add_device(pdev->dev.parent, -1, &cell_entry, NULL, 0, |
| 263 | NULL)) |
Andres Salomon | fa1df69 | 2011-03-21 19:19:35 -0700 | [diff] [blame] | 264 | dev_err(dev, "failed to create platform device '%s'\n", |
| 265 | clones[i]); |
| 266 | } |
| 267 | |
| 268 | return 0; |
Andres Salomon | a9bbba9 | 2011-02-17 19:07:35 -0800 | [diff] [blame] | 269 | } |
Andres Salomon | fa1df69 | 2011-03-21 19:19:35 -0700 | [diff] [blame] | 270 | EXPORT_SYMBOL(mfd_clone_cell); |
Andres Salomon | a9bbba9 | 2011-02-17 19:07:35 -0800 | [diff] [blame] | 271 | |
Dmitry Baryshkov | aa613de | 2008-06-27 10:37:19 +0100 | [diff] [blame] | 272 | MODULE_LICENSE("GPL"); |
| 273 | MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov"); |