linux/lib/devres.c
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   1#include <linux/pci.h>
   2#include <linux/io.h>
   3#include <linux/gfp.h>
   4#include <linux/module.h>
   5
   6void devm_ioremap_release(struct device *dev, void *res)
   7{
   8        iounmap(*(void __iomem **)res);
   9}
  10
  11static int devm_ioremap_match(struct device *dev, void *res, void *match_data)
  12{
  13        return *(void **)res == match_data;
  14}
  15
  16/**
  17 * devm_ioremap - Managed ioremap()
  18 * @dev: Generic device to remap IO address for
  19 * @offset: BUS offset to map
  20 * @size: Size of map
  21 *
  22 * Managed ioremap().  Map is automatically unmapped on driver detach.
  23 */
  24void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
  25                           unsigned long size)
  26{
  27        void __iomem **ptr, *addr;
  28
  29        ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
  30        if (!ptr)
  31                return NULL;
  32
  33        addr = ioremap(offset, size);
  34        if (addr) {
  35                *ptr = addr;
  36                devres_add(dev, ptr);
  37        } else
  38                devres_free(ptr);
  39
  40        return addr;
  41}
  42EXPORT_SYMBOL(devm_ioremap);
  43
  44/**
  45 * devm_ioremap_nocache - Managed ioremap_nocache()
  46 * @dev: Generic device to remap IO address for
  47 * @offset: BUS offset to map
  48 * @size: Size of map
  49 *
  50 * Managed ioremap_nocache().  Map is automatically unmapped on driver
  51 * detach.
  52 */
  53void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
  54                                   unsigned long size)
  55{
  56        void __iomem **ptr, *addr;
  57
  58        ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
  59        if (!ptr)
  60                return NULL;
  61
  62        addr = ioremap_nocache(offset, size);
  63        if (addr) {
  64                *ptr = addr;
  65                devres_add(dev, ptr);
  66        } else
  67                devres_free(ptr);
  68
  69        return addr;
  70}
  71EXPORT_SYMBOL(devm_ioremap_nocache);
  72
  73/**
  74 * devm_iounmap - Managed iounmap()
  75 * @dev: Generic device to unmap for
  76 * @addr: Address to unmap
  77 *
  78 * Managed iounmap().  @addr must have been mapped using devm_ioremap*().
  79 */
  80void devm_iounmap(struct device *dev, void __iomem *addr)
  81{
  82        WARN_ON(devres_destroy(dev, devm_ioremap_release, devm_ioremap_match,
  83                               (void *)addr));
  84        iounmap(addr);
  85}
  86EXPORT_SYMBOL(devm_iounmap);
  87
  88#ifdef CONFIG_HAS_IOPORT
  89/*
  90 * Generic iomap devres
  91 */
  92static void devm_ioport_map_release(struct device *dev, void *res)
  93{
  94        ioport_unmap(*(void __iomem **)res);
  95}
  96
  97static int devm_ioport_map_match(struct device *dev, void *res,
  98                                 void *match_data)
  99{
 100        return *(void **)res == match_data;
 101}
 102
 103/**
 104 * devm_ioport_map - Managed ioport_map()
 105 * @dev: Generic device to map ioport for
 106 * @port: Port to map
 107 * @nr: Number of ports to map
 108 *
 109 * Managed ioport_map().  Map is automatically unmapped on driver
 110 * detach.
 111 */
 112void __iomem * devm_ioport_map(struct device *dev, unsigned long port,
 113                               unsigned int nr)
 114{
 115        void __iomem **ptr, *addr;
 116
 117        ptr = devres_alloc(devm_ioport_map_release, sizeof(*ptr), GFP_KERNEL);
 118        if (!ptr)
 119                return NULL;
 120
 121        addr = ioport_map(port, nr);
 122        if (addr) {
 123                *ptr = addr;
 124                devres_add(dev, ptr);
 125        } else
 126                devres_free(ptr);
 127
 128        return addr;
 129}
 130EXPORT_SYMBOL(devm_ioport_map);
 131
 132/**
 133 * devm_ioport_unmap - Managed ioport_unmap()
 134 * @dev: Generic device to unmap for
 135 * @addr: Address to unmap
 136 *
 137 * Managed ioport_unmap().  @addr must have been mapped using
 138 * devm_ioport_map().
 139 */
 140void devm_ioport_unmap(struct device *dev, void __iomem *addr)
 141{
 142        ioport_unmap(addr);
 143        WARN_ON(devres_destroy(dev, devm_ioport_map_release,
 144                               devm_ioport_map_match, (void *)addr));
 145}
 146EXPORT_SYMBOL(devm_ioport_unmap);
 147
 148#ifdef CONFIG_PCI
 149/*
 150 * PCI iomap devres
 151 */
 152#define PCIM_IOMAP_MAX  PCI_ROM_RESOURCE
 153
 154struct pcim_iomap_devres {
 155        void __iomem *table[PCIM_IOMAP_MAX];
 156};
 157
 158static void pcim_iomap_release(struct device *gendev, void *res)
 159{
 160        struct pci_dev *dev = container_of(gendev, struct pci_dev, dev);
 161        struct pcim_iomap_devres *this = res;
 162        int i;
 163
 164        for (i = 0; i < PCIM_IOMAP_MAX; i++)
 165                if (this->table[i])
 166                        pci_iounmap(dev, this->table[i]);
 167}
 168
 169/**
 170 * pcim_iomap_table - access iomap allocation table
 171 * @pdev: PCI device to access iomap table for
 172 *
 173 * Access iomap allocation table for @dev.  If iomap table doesn't
 174 * exist and @pdev is managed, it will be allocated.  All iomaps
 175 * recorded in the iomap table are automatically unmapped on driver
 176 * detach.
 177 *
 178 * This function might sleep when the table is first allocated but can
 179 * be safely called without context and guaranteed to succed once
 180 * allocated.
 181 */
 182void __iomem * const * pcim_iomap_table(struct pci_dev *pdev)
 183{
 184        struct pcim_iomap_devres *dr, *new_dr;
 185
 186        dr = devres_find(&pdev->dev, pcim_iomap_release, NULL, NULL);
 187        if (dr)
 188                return dr->table;
 189
 190        new_dr = devres_alloc(pcim_iomap_release, sizeof(*new_dr), GFP_KERNEL);
 191        if (!new_dr)
 192                return NULL;
 193        dr = devres_get(&pdev->dev, new_dr, NULL, NULL);
 194        return dr->table;
 195}
 196EXPORT_SYMBOL(pcim_iomap_table);
 197
 198/**
 199 * pcim_iomap - Managed pcim_iomap()
 200 * @pdev: PCI device to iomap for
 201 * @bar: BAR to iomap
 202 * @maxlen: Maximum length of iomap
 203 *
 204 * Managed pci_iomap().  Map is automatically unmapped on driver
 205 * detach.
 206 */
 207void __iomem * pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen)
 208{
 209        void __iomem **tbl;
 210
 211        BUG_ON(bar >= PCIM_IOMAP_MAX);
 212
 213        tbl = (void __iomem **)pcim_iomap_table(pdev);
 214        if (!tbl || tbl[bar])   /* duplicate mappings not allowed */
 215                return NULL;
 216
 217        tbl[bar] = pci_iomap(pdev, bar, maxlen);
 218        return tbl[bar];
 219}
 220EXPORT_SYMBOL(pcim_iomap);
 221
 222/**
 223 * pcim_iounmap - Managed pci_iounmap()
 224 * @pdev: PCI device to iounmap for
 225 * @addr: Address to unmap
 226 *
 227 * Managed pci_iounmap().  @addr must have been mapped using pcim_iomap().
 228 */
 229void pcim_iounmap(struct pci_dev *pdev, void __iomem *addr)
 230{
 231        void __iomem **tbl;
 232        int i;
 233
 234        pci_iounmap(pdev, addr);
 235
 236        tbl = (void __iomem **)pcim_iomap_table(pdev);
 237        BUG_ON(!tbl);
 238
 239        for (i = 0; i < PCIM_IOMAP_MAX; i++)
 240                if (tbl[i] == addr) {
 241                        tbl[i] = NULL;
 242                        return;
 243                }
 244        WARN_ON(1);
 245}
 246EXPORT_SYMBOL(pcim_iounmap);
 247
 248/**
 249 * pcim_iomap_regions - Request and iomap PCI BARs
 250 * @pdev: PCI device to map IO resources for
 251 * @mask: Mask of BARs to request and iomap
 252 * @name: Name used when requesting regions
 253 *
 254 * Request and iomap regions specified by @mask.
 255 */
 256int pcim_iomap_regions(struct pci_dev *pdev, u16 mask, const char *name)
 257{
 258        void __iomem * const *iomap;
 259        int i, rc;
 260
 261        iomap = pcim_iomap_table(pdev);
 262        if (!iomap)
 263                return -ENOMEM;
 264
 265        for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
 266                unsigned long len;
 267
 268                if (!(mask & (1 << i)))
 269                        continue;
 270
 271                rc = -EINVAL;
 272                len = pci_resource_len(pdev, i);
 273                if (!len)
 274                        goto err_inval;
 275
 276                rc = pci_request_region(pdev, i, name);
 277                if (rc)
 278                        goto err_inval;
 279
 280                rc = -ENOMEM;
 281                if (!pcim_iomap(pdev, i, 0))
 282                        goto err_region;
 283        }
 284
 285        return 0;
 286
 287 err_region:
 288        pci_release_region(pdev, i);
 289 err_inval:
 290        while (--i >= 0) {
 291                if (!(mask & (1 << i)))
 292                        continue;
 293                pcim_iounmap(pdev, iomap[i]);
 294                pci_release_region(pdev, i);
 295        }
 296
 297        return rc;
 298}
 299EXPORT_SYMBOL(pcim_iomap_regions);
 300
 301/**
 302 * pcim_iomap_regions_request_all - Request all BARs and iomap specified ones
 303 * @pdev: PCI device to map IO resources for
 304 * @mask: Mask of BARs to iomap
 305 * @name: Name used when requesting regions
 306 *
 307 * Request all PCI BARs and iomap regions specified by @mask.
 308 */
 309int pcim_iomap_regions_request_all(struct pci_dev *pdev, u16 mask,
 310                                   const char *name)
 311{
 312        int request_mask = ((1 << 6) - 1) & ~mask;
 313        int rc;
 314
 315        rc = pci_request_selected_regions(pdev, request_mask, name);
 316        if (rc)
 317                return rc;
 318
 319        rc = pcim_iomap_regions(pdev, mask, name);
 320        if (rc)
 321                pci_release_selected_regions(pdev, request_mask);
 322        return rc;
 323}
 324EXPORT_SYMBOL(pcim_iomap_regions_request_all);
 325
 326/**
 327 * pcim_iounmap_regions - Unmap and release PCI BARs
 328 * @pdev: PCI device to map IO resources for
 329 * @mask: Mask of BARs to unmap and release
 330 *
 331 * Unmap and release regions specified by @mask.
 332 */
 333void pcim_iounmap_regions(struct pci_dev *pdev, u16 mask)
 334{
 335        void __iomem * const *iomap;
 336        int i;
 337
 338        iomap = pcim_iomap_table(pdev);
 339        if (!iomap)
 340                return;
 341
 342        for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
 343                if (!(mask & (1 << i)))
 344                        continue;
 345
 346                pcim_iounmap(pdev, iomap[i]);
 347                pci_release_region(pdev, i);
 348        }
 349}
 350EXPORT_SYMBOL(pcim_iounmap_regions);
 351#endif
 352#endif
 353
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