1aa613de6SDmitry Baryshkov /* 2aa613de6SDmitry Baryshkov * drivers/mfd/mfd-core.c 3aa613de6SDmitry Baryshkov * 4aa613de6SDmitry Baryshkov * core MFD support 5aa613de6SDmitry Baryshkov * Copyright (c) 2006 Ian Molton 6aa613de6SDmitry Baryshkov * Copyright (c) 2007,2008 Dmitry Baryshkov 7aa613de6SDmitry Baryshkov * 8aa613de6SDmitry Baryshkov * This program is free software; you can redistribute it and/or modify 9aa613de6SDmitry Baryshkov * it under the terms of the GNU General Public License version 2 as 10aa613de6SDmitry Baryshkov * published by the Free Software Foundation. 11aa613de6SDmitry Baryshkov * 12aa613de6SDmitry Baryshkov */ 13aa613de6SDmitry Baryshkov 14aa613de6SDmitry Baryshkov #include <linux/kernel.h> 15aa613de6SDmitry Baryshkov #include <linux/platform_device.h> 1691fededeSSamuel Ortiz #include <linux/acpi.h> 17aa613de6SDmitry Baryshkov #include <linux/mfd/core.h> 184c90aa94SMark Brown #include <linux/pm_runtime.h> 195a0e3ad6STejun Heo #include <linux/slab.h> 204e36dd33SPaul Gortmaker #include <linux/module.h> 21c94bb233SLee Jones #include <linux/irqdomain.h> 22c94bb233SLee Jones #include <linux/of.h> 237fcd4274SCharles Keepax #include <linux/regulator/consumer.h> 24aa613de6SDmitry Baryshkov 25b9fbb62eSCharles Keepax static struct device_type mfd_dev_type = { 26b9fbb62eSCharles Keepax .name = "mfd_device", 27b9fbb62eSCharles Keepax }; 28b9fbb62eSCharles Keepax 29f77289acSAndres Salomon int mfd_cell_enable(struct platform_device *pdev) 301e29af62SAndres Salomon { 311e29af62SAndres Salomon const struct mfd_cell *cell = mfd_get_cell(pdev); 321e29af62SAndres Salomon int err = 0; 331e29af62SAndres Salomon 341e29af62SAndres Salomon /* only call enable hook if the cell wasn't previously enabled */ 351e29af62SAndres Salomon if (atomic_inc_return(cell->usage_count) == 1) 361e29af62SAndres Salomon err = cell->enable(pdev); 371e29af62SAndres Salomon 381e29af62SAndres Salomon /* if the enable hook failed, decrement counter to allow retries */ 391e29af62SAndres Salomon if (err) 401e29af62SAndres Salomon atomic_dec(cell->usage_count); 411e29af62SAndres Salomon 421e29af62SAndres Salomon return err; 431e29af62SAndres Salomon } 44f77289acSAndres Salomon EXPORT_SYMBOL(mfd_cell_enable); 451e29af62SAndres Salomon 46f77289acSAndres Salomon int mfd_cell_disable(struct platform_device *pdev) 471e29af62SAndres Salomon { 481e29af62SAndres Salomon const struct mfd_cell *cell = mfd_get_cell(pdev); 491e29af62SAndres Salomon int err = 0; 501e29af62SAndres Salomon 511e29af62SAndres Salomon /* only disable if no other clients are using it */ 521e29af62SAndres Salomon if (atomic_dec_return(cell->usage_count) == 0) 531e29af62SAndres Salomon err = cell->disable(pdev); 541e29af62SAndres Salomon 551e29af62SAndres Salomon /* if the disable hook failed, increment to allow retries */ 561e29af62SAndres Salomon if (err) 571e29af62SAndres Salomon atomic_inc(cell->usage_count); 581e29af62SAndres Salomon 591e29af62SAndres Salomon /* sanity check; did someone call disable too many times? */ 601e29af62SAndres Salomon WARN_ON(atomic_read(cell->usage_count) < 0); 611e29af62SAndres Salomon 621e29af62SAndres Salomon return err; 631e29af62SAndres Salomon } 64f77289acSAndres Salomon EXPORT_SYMBOL(mfd_cell_disable); 651e29af62SAndres Salomon 66e710d7d5SSamuel Ortiz static int mfd_platform_add_cell(struct platform_device *pdev, 6703e361b2SGeert Uytterhoeven const struct mfd_cell *cell, 6803e361b2SGeert Uytterhoeven atomic_t *usage_count) 69e710d7d5SSamuel Ortiz { 70e710d7d5SSamuel Ortiz if (!cell) 71e710d7d5SSamuel Ortiz return 0; 72e710d7d5SSamuel Ortiz 73e710d7d5SSamuel Ortiz pdev->mfd_cell = kmemdup(cell, sizeof(*cell), GFP_KERNEL); 74e710d7d5SSamuel Ortiz if (!pdev->mfd_cell) 75e710d7d5SSamuel Ortiz return -ENOMEM; 76e710d7d5SSamuel Ortiz 7703e361b2SGeert Uytterhoeven pdev->mfd_cell->usage_count = usage_count; 78e710d7d5SSamuel Ortiz return 0; 79e710d7d5SSamuel Ortiz } 80e710d7d5SSamuel Ortiz 81424f525aSDmitry Baryshkov static int mfd_add_device(struct device *parent, int id, 8203e361b2SGeert Uytterhoeven const struct mfd_cell *cell, atomic_t *usage_count, 83aa613de6SDmitry Baryshkov struct resource *mem_base, 840848c94fSMark Brown int irq_base, struct irq_domain *domain) 85aa613de6SDmitry Baryshkov { 86a87903f3SIan Molton struct resource *res; 87aa613de6SDmitry Baryshkov struct platform_device *pdev; 88c94bb233SLee Jones struct device_node *np = NULL; 89aa613de6SDmitry Baryshkov int ret = -ENOMEM; 90aa613de6SDmitry Baryshkov int r; 91aa613de6SDmitry Baryshkov 923bed6e41SMark Brown pdev = platform_device_alloc(cell->name, id + cell->id); 93aa613de6SDmitry Baryshkov if (!pdev) 94aa613de6SDmitry Baryshkov goto fail_alloc; 95aa613de6SDmitry Baryshkov 96a87903f3SIan Molton res = kzalloc(sizeof(*res) * cell->num_resources, GFP_KERNEL); 97a87903f3SIan Molton if (!res) 98a87903f3SIan Molton goto fail_device; 99a87903f3SIan Molton 100424f525aSDmitry Baryshkov pdev->dev.parent = parent; 101b9fbb62eSCharles Keepax pdev->dev.type = &mfd_dev_type; 102b018e136SBenedikt Spranger pdev->dev.dma_mask = parent->dma_mask; 103b018e136SBenedikt Spranger pdev->dev.dma_parms = parent->dma_parms; 1044f08df1bSBoris BREZILLON pdev->dev.coherent_dma_mask = parent->coherent_dma_mask; 105aa613de6SDmitry Baryshkov 106d137be00SCharles Keepax ret = regulator_bulk_register_supply_alias( 1077fcd4274SCharles Keepax &pdev->dev, cell->parent_supplies, 1087fcd4274SCharles Keepax parent, cell->parent_supplies, 1097fcd4274SCharles Keepax cell->num_parent_supplies); 1107fcd4274SCharles Keepax if (ret < 0) 1117fcd4274SCharles Keepax goto fail_res; 1127fcd4274SCharles Keepax 113c94bb233SLee Jones if (parent->of_node && cell->of_compatible) { 114c94bb233SLee Jones for_each_child_of_node(parent->of_node, np) { 115c94bb233SLee Jones if (of_device_is_compatible(np, cell->of_compatible)) { 116c94bb233SLee Jones pdev->dev.of_node = np; 117c94bb233SLee Jones break; 118c94bb233SLee Jones } 119c94bb233SLee Jones } 120c94bb233SLee Jones } 121c94bb233SLee Jones 122eb895607SSamuel Ortiz if (cell->pdata_size) { 123eb895607SSamuel Ortiz ret = platform_device_add_data(pdev, 124eb895607SSamuel Ortiz cell->platform_data, cell->pdata_size); 125eb895607SSamuel Ortiz if (ret) 1267fcd4274SCharles Keepax goto fail_alias; 127eb895607SSamuel Ortiz } 128eb895607SSamuel Ortiz 12903e361b2SGeert Uytterhoeven ret = mfd_platform_add_cell(pdev, cell, usage_count); 130aa613de6SDmitry Baryshkov if (ret) 1317fcd4274SCharles Keepax goto fail_alias; 132aa613de6SDmitry Baryshkov 133aa613de6SDmitry Baryshkov for (r = 0; r < cell->num_resources; r++) { 134aa613de6SDmitry Baryshkov res[r].name = cell->resources[r].name; 135aa613de6SDmitry Baryshkov res[r].flags = cell->resources[r].flags; 136aa613de6SDmitry Baryshkov 137aa613de6SDmitry Baryshkov /* Find out base to use */ 138f03cfcbcSSamuel Ortiz if ((cell->resources[r].flags & IORESOURCE_MEM) && mem_base) { 139aa613de6SDmitry Baryshkov res[r].parent = mem_base; 140aa613de6SDmitry Baryshkov res[r].start = mem_base->start + 141aa613de6SDmitry Baryshkov cell->resources[r].start; 142aa613de6SDmitry Baryshkov res[r].end = mem_base->start + 143aa613de6SDmitry Baryshkov cell->resources[r].end; 144aa613de6SDmitry Baryshkov } else if (cell->resources[r].flags & IORESOURCE_IRQ) { 145c94bb233SLee Jones if (domain) { 146c94bb233SLee Jones /* Unable to create mappings for IRQ ranges. */ 147c94bb233SLee Jones WARN_ON(cell->resources[r].start != 148c94bb233SLee Jones cell->resources[r].end); 149c94bb233SLee Jones res[r].start = res[r].end = irq_create_mapping( 150c94bb233SLee Jones domain, cell->resources[r].start); 151c94bb233SLee Jones } else { 152aa613de6SDmitry Baryshkov res[r].start = irq_base + 153aa613de6SDmitry Baryshkov cell->resources[r].start; 154aa613de6SDmitry Baryshkov res[r].end = irq_base + 155aa613de6SDmitry Baryshkov cell->resources[r].end; 156c94bb233SLee Jones } 157aa613de6SDmitry Baryshkov } else { 158aa613de6SDmitry Baryshkov res[r].parent = cell->resources[r].parent; 159aa613de6SDmitry Baryshkov res[r].start = cell->resources[r].start; 160aa613de6SDmitry Baryshkov res[r].end = cell->resources[r].end; 161aa613de6SDmitry Baryshkov } 16291fededeSSamuel Ortiz 1635f2545faSDaniel Drake if (!cell->ignore_resource_conflicts) { 164855cc454SJean Delvare ret = acpi_check_resource_conflict(&res[r]); 16591fededeSSamuel Ortiz if (ret) 1667fcd4274SCharles Keepax goto fail_alias; 167aa613de6SDmitry Baryshkov } 1685f2545faSDaniel Drake } 169aa613de6SDmitry Baryshkov 1708af5fe3bSAxel Lin ret = platform_device_add_resources(pdev, res, cell->num_resources); 1718af5fe3bSAxel Lin if (ret) 1727fcd4274SCharles Keepax goto fail_alias; 173aa613de6SDmitry Baryshkov 174aa613de6SDmitry Baryshkov ret = platform_device_add(pdev); 175aa613de6SDmitry Baryshkov if (ret) 1767fcd4274SCharles Keepax goto fail_alias; 177a87903f3SIan Molton 1784c90aa94SMark Brown if (cell->pm_runtime_no_callbacks) 1794c90aa94SMark Brown pm_runtime_no_callbacks(&pdev->dev); 1804c90aa94SMark Brown 181a87903f3SIan Molton kfree(res); 182aa613de6SDmitry Baryshkov 183aa613de6SDmitry Baryshkov return 0; 184aa613de6SDmitry Baryshkov 1857fcd4274SCharles Keepax fail_alias: 186d137be00SCharles Keepax regulator_bulk_unregister_supply_alias(&pdev->dev, 1877fcd4274SCharles Keepax cell->parent_supplies, 1887fcd4274SCharles Keepax cell->num_parent_supplies); 189a87903f3SIan Molton fail_res: 190a87903f3SIan Molton kfree(res); 191aa613de6SDmitry Baryshkov fail_device: 192aa613de6SDmitry Baryshkov platform_device_put(pdev); 193aa613de6SDmitry Baryshkov fail_alloc: 194aa613de6SDmitry Baryshkov return ret; 195aa613de6SDmitry Baryshkov } 196aa613de6SDmitry Baryshkov 197424f525aSDmitry Baryshkov int mfd_add_devices(struct device *parent, int id, 19803e361b2SGeert Uytterhoeven const struct mfd_cell *cells, int n_devs, 199aa613de6SDmitry Baryshkov struct resource *mem_base, 2000848c94fSMark Brown int irq_base, struct irq_domain *domain) 201aa613de6SDmitry Baryshkov { 202aa613de6SDmitry Baryshkov int i; 2030b208e41SGeert Uytterhoeven int ret; 2041e29af62SAndres Salomon atomic_t *cnts; 2051e29af62SAndres Salomon 2061e29af62SAndres Salomon /* initialize reference counting for all cells */ 207d1b5c5e2SAxel Lin cnts = kcalloc(n_devs, sizeof(*cnts), GFP_KERNEL); 2081e29af62SAndres Salomon if (!cnts) 2091e29af62SAndres Salomon return -ENOMEM; 210aa613de6SDmitry Baryshkov 211aa613de6SDmitry Baryshkov for (i = 0; i < n_devs; i++) { 2121e29af62SAndres Salomon atomic_set(&cnts[i], 0); 21303e361b2SGeert Uytterhoeven ret = mfd_add_device(parent, id, cells + i, cnts + i, mem_base, 2140848c94fSMark Brown irq_base, domain); 215aa613de6SDmitry Baryshkov if (ret) 2160b208e41SGeert Uytterhoeven goto fail; 217aa613de6SDmitry Baryshkov } 218aa613de6SDmitry Baryshkov 2190b208e41SGeert Uytterhoeven return 0; 220aa613de6SDmitry Baryshkov 2210b208e41SGeert Uytterhoeven fail: 2220b208e41SGeert Uytterhoeven if (i) 2230b208e41SGeert Uytterhoeven mfd_remove_devices(parent); 2240b208e41SGeert Uytterhoeven else 2250b208e41SGeert Uytterhoeven kfree(cnts); 226aa613de6SDmitry Baryshkov return ret; 227aa613de6SDmitry Baryshkov } 228aa613de6SDmitry Baryshkov EXPORT_SYMBOL(mfd_add_devices); 229aa613de6SDmitry Baryshkov 2301e29af62SAndres Salomon static int mfd_remove_devices_fn(struct device *dev, void *c) 231aa613de6SDmitry Baryshkov { 232b9fbb62eSCharles Keepax struct platform_device *pdev; 233b9fbb62eSCharles Keepax const struct mfd_cell *cell; 2341e29af62SAndres Salomon atomic_t **usage_count = c; 2351e29af62SAndres Salomon 236b9fbb62eSCharles Keepax if (dev->type != &mfd_dev_type) 237b9fbb62eSCharles Keepax return 0; 238b9fbb62eSCharles Keepax 239b9fbb62eSCharles Keepax pdev = to_platform_device(dev); 240b9fbb62eSCharles Keepax cell = mfd_get_cell(pdev); 241b9fbb62eSCharles Keepax 242d137be00SCharles Keepax regulator_bulk_unregister_supply_alias(dev, cell->parent_supplies, 243d137be00SCharles Keepax cell->num_parent_supplies); 244d137be00SCharles Keepax 2451e29af62SAndres Salomon /* find the base address of usage_count pointers (for freeing) */ 2461e29af62SAndres Salomon if (!*usage_count || (cell->usage_count < *usage_count)) 2471e29af62SAndres Salomon *usage_count = cell->usage_count; 2481e29af62SAndres Salomon 2491e29af62SAndres Salomon platform_device_unregister(pdev); 250aa613de6SDmitry Baryshkov return 0; 251aa613de6SDmitry Baryshkov } 252aa613de6SDmitry Baryshkov 253424f525aSDmitry Baryshkov void mfd_remove_devices(struct device *parent) 254aa613de6SDmitry Baryshkov { 2551e29af62SAndres Salomon atomic_t *cnts = NULL; 2561e29af62SAndres Salomon 2571e29af62SAndres Salomon device_for_each_child(parent, &cnts, mfd_remove_devices_fn); 2581e29af62SAndres Salomon kfree(cnts); 259aa613de6SDmitry Baryshkov } 260aa613de6SDmitry Baryshkov EXPORT_SYMBOL(mfd_remove_devices); 261aa613de6SDmitry Baryshkov 262fa1df691SAndres Salomon int mfd_clone_cell(const char *cell, const char **clones, size_t n_clones) 263a9bbba99SAndres Salomon { 264a9bbba99SAndres Salomon struct mfd_cell cell_entry; 265a9bbba99SAndres Salomon struct device *dev; 266a9bbba99SAndres Salomon struct platform_device *pdev; 267fa1df691SAndres Salomon int i; 268a9bbba99SAndres Salomon 269a9bbba99SAndres Salomon /* fetch the parent cell's device (should already be registered!) */ 270a9bbba99SAndres Salomon dev = bus_find_device_by_name(&platform_bus_type, NULL, cell); 271a9bbba99SAndres Salomon if (!dev) { 272a9bbba99SAndres Salomon printk(KERN_ERR "failed to find device for cell %s\n", cell); 273a9bbba99SAndres Salomon return -ENODEV; 274a9bbba99SAndres Salomon } 275a9bbba99SAndres Salomon pdev = to_platform_device(dev); 276a9bbba99SAndres Salomon memcpy(&cell_entry, mfd_get_cell(pdev), sizeof(cell_entry)); 277a9bbba99SAndres Salomon 278a9bbba99SAndres Salomon WARN_ON(!cell_entry.enable); 279a9bbba99SAndres Salomon 280fa1df691SAndres Salomon for (i = 0; i < n_clones; i++) { 281fa1df691SAndres Salomon cell_entry.name = clones[i]; 282fa1df691SAndres Salomon /* don't give up if a single call fails; just report error */ 28303e361b2SGeert Uytterhoeven if (mfd_add_device(pdev->dev.parent, -1, &cell_entry, 28403e361b2SGeert Uytterhoeven cell_entry.usage_count, NULL, 0, NULL)) 285fa1df691SAndres Salomon dev_err(dev, "failed to create platform device '%s'\n", 286fa1df691SAndres Salomon clones[i]); 287a9bbba99SAndres Salomon } 288a9bbba99SAndres Salomon 289fa1df691SAndres Salomon return 0; 290a9bbba99SAndres Salomon } 291fa1df691SAndres Salomon EXPORT_SYMBOL(mfd_clone_cell); 292a9bbba99SAndres Salomon 293aa613de6SDmitry Baryshkov MODULE_LICENSE("GPL"); 294aa613de6SDmitry Baryshkov MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov"); 295