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> 23aa613de6SDmitry Baryshkov 24b9fbb62eSCharles Keepax static struct device_type mfd_dev_type = { 25b9fbb62eSCharles Keepax .name = "mfd_device", 26b9fbb62eSCharles Keepax }; 27b9fbb62eSCharles Keepax 28f77289acSAndres Salomon int mfd_cell_enable(struct platform_device *pdev) 291e29af62SAndres Salomon { 301e29af62SAndres Salomon const struct mfd_cell *cell = mfd_get_cell(pdev); 311e29af62SAndres Salomon int err = 0; 321e29af62SAndres Salomon 331e29af62SAndres Salomon /* only call enable hook if the cell wasn't previously enabled */ 341e29af62SAndres Salomon if (atomic_inc_return(cell->usage_count) == 1) 351e29af62SAndres Salomon err = cell->enable(pdev); 361e29af62SAndres Salomon 371e29af62SAndres Salomon /* if the enable hook failed, decrement counter to allow retries */ 381e29af62SAndres Salomon if (err) 391e29af62SAndres Salomon atomic_dec(cell->usage_count); 401e29af62SAndres Salomon 411e29af62SAndres Salomon return err; 421e29af62SAndres Salomon } 43f77289acSAndres Salomon EXPORT_SYMBOL(mfd_cell_enable); 441e29af62SAndres Salomon 45f77289acSAndres Salomon int mfd_cell_disable(struct platform_device *pdev) 461e29af62SAndres Salomon { 471e29af62SAndres Salomon const struct mfd_cell *cell = mfd_get_cell(pdev); 481e29af62SAndres Salomon int err = 0; 491e29af62SAndres Salomon 501e29af62SAndres Salomon /* only disable if no other clients are using it */ 511e29af62SAndres Salomon if (atomic_dec_return(cell->usage_count) == 0) 521e29af62SAndres Salomon err = cell->disable(pdev); 531e29af62SAndres Salomon 541e29af62SAndres Salomon /* if the disable hook failed, increment to allow retries */ 551e29af62SAndres Salomon if (err) 561e29af62SAndres Salomon atomic_inc(cell->usage_count); 571e29af62SAndres Salomon 581e29af62SAndres Salomon /* sanity check; did someone call disable too many times? */ 591e29af62SAndres Salomon WARN_ON(atomic_read(cell->usage_count) < 0); 601e29af62SAndres Salomon 611e29af62SAndres Salomon return err; 621e29af62SAndres Salomon } 63f77289acSAndres Salomon EXPORT_SYMBOL(mfd_cell_disable); 641e29af62SAndres Salomon 65e710d7d5SSamuel Ortiz static int mfd_platform_add_cell(struct platform_device *pdev, 6603e361b2SGeert Uytterhoeven const struct mfd_cell *cell, 6703e361b2SGeert Uytterhoeven atomic_t *usage_count) 68e710d7d5SSamuel Ortiz { 69e710d7d5SSamuel Ortiz if (!cell) 70e710d7d5SSamuel Ortiz return 0; 71e710d7d5SSamuel Ortiz 72e710d7d5SSamuel Ortiz pdev->mfd_cell = kmemdup(cell, sizeof(*cell), GFP_KERNEL); 73e710d7d5SSamuel Ortiz if (!pdev->mfd_cell) 74e710d7d5SSamuel Ortiz return -ENOMEM; 75e710d7d5SSamuel Ortiz 7603e361b2SGeert Uytterhoeven pdev->mfd_cell->usage_count = usage_count; 77e710d7d5SSamuel Ortiz return 0; 78e710d7d5SSamuel Ortiz } 79e710d7d5SSamuel Ortiz 80424f525aSDmitry Baryshkov static int mfd_add_device(struct device *parent, int id, 8103e361b2SGeert Uytterhoeven const struct mfd_cell *cell, atomic_t *usage_count, 82aa613de6SDmitry Baryshkov struct resource *mem_base, 830848c94fSMark Brown int irq_base, struct irq_domain *domain) 84aa613de6SDmitry Baryshkov { 85a87903f3SIan Molton struct resource *res; 86aa613de6SDmitry Baryshkov struct platform_device *pdev; 87c94bb233SLee Jones struct device_node *np = NULL; 88aa613de6SDmitry Baryshkov int ret = -ENOMEM; 89aa613de6SDmitry Baryshkov int r; 90aa613de6SDmitry Baryshkov 913bed6e41SMark Brown pdev = platform_device_alloc(cell->name, id + cell->id); 92aa613de6SDmitry Baryshkov if (!pdev) 93aa613de6SDmitry Baryshkov goto fail_alloc; 94aa613de6SDmitry Baryshkov 95a87903f3SIan Molton res = kzalloc(sizeof(*res) * cell->num_resources, GFP_KERNEL); 96a87903f3SIan Molton if (!res) 97a87903f3SIan Molton goto fail_device; 98a87903f3SIan Molton 99424f525aSDmitry Baryshkov pdev->dev.parent = parent; 100b9fbb62eSCharles Keepax pdev->dev.type = &mfd_dev_type; 101b018e136SBenedikt Spranger pdev->dev.dma_mask = parent->dma_mask; 102b018e136SBenedikt Spranger pdev->dev.dma_parms = parent->dma_parms; 103aa613de6SDmitry Baryshkov 104c94bb233SLee Jones if (parent->of_node && cell->of_compatible) { 105c94bb233SLee Jones for_each_child_of_node(parent->of_node, np) { 106c94bb233SLee Jones if (of_device_is_compatible(np, cell->of_compatible)) { 107c94bb233SLee Jones pdev->dev.of_node = np; 108c94bb233SLee Jones break; 109c94bb233SLee Jones } 110c94bb233SLee Jones } 111c94bb233SLee Jones } 112c94bb233SLee Jones 113eb895607SSamuel Ortiz if (cell->pdata_size) { 114eb895607SSamuel Ortiz ret = platform_device_add_data(pdev, 115eb895607SSamuel Ortiz cell->platform_data, cell->pdata_size); 116eb895607SSamuel Ortiz if (ret) 117eb895607SSamuel Ortiz goto fail_res; 118eb895607SSamuel Ortiz } 119eb895607SSamuel Ortiz 12003e361b2SGeert Uytterhoeven ret = mfd_platform_add_cell(pdev, cell, usage_count); 121aa613de6SDmitry Baryshkov if (ret) 122a87903f3SIan Molton goto fail_res; 123aa613de6SDmitry Baryshkov 124aa613de6SDmitry Baryshkov for (r = 0; r < cell->num_resources; r++) { 125aa613de6SDmitry Baryshkov res[r].name = cell->resources[r].name; 126aa613de6SDmitry Baryshkov res[r].flags = cell->resources[r].flags; 127aa613de6SDmitry Baryshkov 128aa613de6SDmitry Baryshkov /* Find out base to use */ 129f03cfcbcSSamuel Ortiz if ((cell->resources[r].flags & IORESOURCE_MEM) && mem_base) { 130aa613de6SDmitry Baryshkov res[r].parent = mem_base; 131aa613de6SDmitry Baryshkov res[r].start = mem_base->start + 132aa613de6SDmitry Baryshkov cell->resources[r].start; 133aa613de6SDmitry Baryshkov res[r].end = mem_base->start + 134aa613de6SDmitry Baryshkov cell->resources[r].end; 135aa613de6SDmitry Baryshkov } else if (cell->resources[r].flags & IORESOURCE_IRQ) { 136c94bb233SLee Jones if (domain) { 137c94bb233SLee Jones /* Unable to create mappings for IRQ ranges. */ 138c94bb233SLee Jones WARN_ON(cell->resources[r].start != 139c94bb233SLee Jones cell->resources[r].end); 140c94bb233SLee Jones res[r].start = res[r].end = irq_create_mapping( 141c94bb233SLee Jones domain, cell->resources[r].start); 142c94bb233SLee Jones } else { 143aa613de6SDmitry Baryshkov res[r].start = irq_base + 144aa613de6SDmitry Baryshkov cell->resources[r].start; 145aa613de6SDmitry Baryshkov res[r].end = irq_base + 146aa613de6SDmitry Baryshkov cell->resources[r].end; 147c94bb233SLee Jones } 148aa613de6SDmitry Baryshkov } else { 149aa613de6SDmitry Baryshkov res[r].parent = cell->resources[r].parent; 150aa613de6SDmitry Baryshkov res[r].start = cell->resources[r].start; 151aa613de6SDmitry Baryshkov res[r].end = cell->resources[r].end; 152aa613de6SDmitry Baryshkov } 15391fededeSSamuel Ortiz 1545f2545faSDaniel Drake if (!cell->ignore_resource_conflicts) { 155855cc454SJean Delvare ret = acpi_check_resource_conflict(&res[r]); 15691fededeSSamuel Ortiz if (ret) 15791fededeSSamuel Ortiz goto fail_res; 158aa613de6SDmitry Baryshkov } 1595f2545faSDaniel Drake } 160aa613de6SDmitry Baryshkov 1618af5fe3bSAxel Lin ret = platform_device_add_resources(pdev, res, cell->num_resources); 1628af5fe3bSAxel Lin if (ret) 1638af5fe3bSAxel Lin goto fail_res; 164aa613de6SDmitry Baryshkov 165aa613de6SDmitry Baryshkov ret = platform_device_add(pdev); 166aa613de6SDmitry Baryshkov if (ret) 167a87903f3SIan Molton goto fail_res; 168a87903f3SIan Molton 1694c90aa94SMark Brown if (cell->pm_runtime_no_callbacks) 1704c90aa94SMark Brown pm_runtime_no_callbacks(&pdev->dev); 1714c90aa94SMark Brown 172a87903f3SIan Molton kfree(res); 173aa613de6SDmitry Baryshkov 174aa613de6SDmitry Baryshkov return 0; 175aa613de6SDmitry Baryshkov 176a87903f3SIan Molton fail_res: 177a87903f3SIan Molton kfree(res); 178aa613de6SDmitry Baryshkov fail_device: 179aa613de6SDmitry Baryshkov platform_device_put(pdev); 180aa613de6SDmitry Baryshkov fail_alloc: 181aa613de6SDmitry Baryshkov return ret; 182aa613de6SDmitry Baryshkov } 183aa613de6SDmitry Baryshkov 184424f525aSDmitry Baryshkov int mfd_add_devices(struct device *parent, int id, 18503e361b2SGeert Uytterhoeven const struct mfd_cell *cells, int n_devs, 186aa613de6SDmitry Baryshkov struct resource *mem_base, 1870848c94fSMark Brown int irq_base, struct irq_domain *domain) 188aa613de6SDmitry Baryshkov { 189aa613de6SDmitry Baryshkov int i; 190aa613de6SDmitry Baryshkov int ret = 0; 1911e29af62SAndres Salomon atomic_t *cnts; 1921e29af62SAndres Salomon 1931e29af62SAndres Salomon /* initialize reference counting for all cells */ 194d1b5c5e2SAxel Lin cnts = kcalloc(n_devs, sizeof(*cnts), GFP_KERNEL); 1951e29af62SAndres Salomon if (!cnts) 1961e29af62SAndres Salomon return -ENOMEM; 197aa613de6SDmitry Baryshkov 198aa613de6SDmitry Baryshkov for (i = 0; i < n_devs; i++) { 1991e29af62SAndres Salomon atomic_set(&cnts[i], 0); 20003e361b2SGeert Uytterhoeven ret = mfd_add_device(parent, id, cells + i, cnts + i, mem_base, 2010848c94fSMark Brown irq_base, domain); 202aa613de6SDmitry Baryshkov if (ret) 203aa613de6SDmitry Baryshkov break; 204aa613de6SDmitry Baryshkov } 205aa613de6SDmitry Baryshkov 206aa613de6SDmitry Baryshkov if (ret) 207aa613de6SDmitry Baryshkov mfd_remove_devices(parent); 208aa613de6SDmitry Baryshkov 209aa613de6SDmitry Baryshkov return ret; 210aa613de6SDmitry Baryshkov } 211aa613de6SDmitry Baryshkov EXPORT_SYMBOL(mfd_add_devices); 212aa613de6SDmitry Baryshkov 2131e29af62SAndres Salomon static int mfd_remove_devices_fn(struct device *dev, void *c) 214aa613de6SDmitry Baryshkov { 215b9fbb62eSCharles Keepax struct platform_device *pdev; 216b9fbb62eSCharles Keepax const struct mfd_cell *cell; 2171e29af62SAndres Salomon atomic_t **usage_count = c; 2181e29af62SAndres Salomon 219b9fbb62eSCharles Keepax if (dev->type != &mfd_dev_type) 220b9fbb62eSCharles Keepax return 0; 221b9fbb62eSCharles Keepax 222b9fbb62eSCharles Keepax pdev = to_platform_device(dev); 223b9fbb62eSCharles Keepax cell = mfd_get_cell(pdev); 224b9fbb62eSCharles Keepax 2251e29af62SAndres Salomon /* find the base address of usage_count pointers (for freeing) */ 2261e29af62SAndres Salomon if (!*usage_count || (cell->usage_count < *usage_count)) 2271e29af62SAndres Salomon *usage_count = cell->usage_count; 2281e29af62SAndres Salomon 2291e29af62SAndres Salomon platform_device_unregister(pdev); 230aa613de6SDmitry Baryshkov return 0; 231aa613de6SDmitry Baryshkov } 232aa613de6SDmitry Baryshkov 233424f525aSDmitry Baryshkov void mfd_remove_devices(struct device *parent) 234aa613de6SDmitry Baryshkov { 2351e29af62SAndres Salomon atomic_t *cnts = NULL; 2361e29af62SAndres Salomon 2371e29af62SAndres Salomon device_for_each_child(parent, &cnts, mfd_remove_devices_fn); 2381e29af62SAndres Salomon kfree(cnts); 239aa613de6SDmitry Baryshkov } 240aa613de6SDmitry Baryshkov EXPORT_SYMBOL(mfd_remove_devices); 241aa613de6SDmitry Baryshkov 242fa1df691SAndres Salomon int mfd_clone_cell(const char *cell, const char **clones, size_t n_clones) 243a9bbba99SAndres Salomon { 244a9bbba99SAndres Salomon struct mfd_cell cell_entry; 245a9bbba99SAndres Salomon struct device *dev; 246a9bbba99SAndres Salomon struct platform_device *pdev; 247fa1df691SAndres Salomon int i; 248a9bbba99SAndres Salomon 249a9bbba99SAndres Salomon /* fetch the parent cell's device (should already be registered!) */ 250a9bbba99SAndres Salomon dev = bus_find_device_by_name(&platform_bus_type, NULL, cell); 251a9bbba99SAndres Salomon if (!dev) { 252a9bbba99SAndres Salomon printk(KERN_ERR "failed to find device for cell %s\n", cell); 253a9bbba99SAndres Salomon return -ENODEV; 254a9bbba99SAndres Salomon } 255a9bbba99SAndres Salomon pdev = to_platform_device(dev); 256a9bbba99SAndres Salomon memcpy(&cell_entry, mfd_get_cell(pdev), sizeof(cell_entry)); 257a9bbba99SAndres Salomon 258a9bbba99SAndres Salomon WARN_ON(!cell_entry.enable); 259a9bbba99SAndres Salomon 260fa1df691SAndres Salomon for (i = 0; i < n_clones; i++) { 261fa1df691SAndres Salomon cell_entry.name = clones[i]; 262fa1df691SAndres Salomon /* don't give up if a single call fails; just report error */ 26303e361b2SGeert Uytterhoeven if (mfd_add_device(pdev->dev.parent, -1, &cell_entry, 26403e361b2SGeert Uytterhoeven cell_entry.usage_count, NULL, 0, NULL)) 265fa1df691SAndres Salomon dev_err(dev, "failed to create platform device '%s'\n", 266fa1df691SAndres Salomon clones[i]); 267a9bbba99SAndres Salomon } 268a9bbba99SAndres Salomon 269fa1df691SAndres Salomon return 0; 270a9bbba99SAndres Salomon } 271fa1df691SAndres Salomon EXPORT_SYMBOL(mfd_clone_cell); 272a9bbba99SAndres Salomon 273aa613de6SDmitry Baryshkov MODULE_LICENSE("GPL"); 274aa613de6SDmitry Baryshkov MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov"); 275