arch/alpha/kernel/pci-sysfs.c

   1 /*
   2  * arch/alpha/kernel/pci-sysfs.c
   3  *
   4  * Copyright (C) 2009 Ivan Kokshaysky
   5  *
   6  * Alpha PCI resource files.
   7  *
   8  * Loosely based on generic HAVE_PCI_MMAP implementation in
   9  * drivers/pci/pci-sysfs.c
  10  */
  11
  12 #include <linux/sched.h>
  13 #include <linux/pci.h>
  14
  15 static int hose_mmap_page_range(struct pci_controller *hose,
  16                                 struct vm_area_struct *vma,
  17                                 enum pci_mmap_state mmap_type, int sparse)
  18 {
  19         unsigned long base;
  20
  21         if (mmap_type == pci_mmap_mem)
  22                 base = sparse ? hose->sparse_mem_base : hose->dense_mem_base;
  23         else
  24                 base = sparse ? hose->sparse_io_base : hose->dense_io_base;
  25
  26         vma->vm_pgoff += base >> PAGE_SHIFT;
  27         vma->vm_flags |= (VM_IO | VM_RESERVED);
  28
  29         return io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
  30                                   vma->vm_end - vma->vm_start,
  31                                   vma->vm_page_prot);
  32 }
  33
  34 static int __pci_mmap_fits(struct pci_dev *pdev, int num,
  35                            struct vm_area_struct *vma, int sparse)
  36 {
  37         unsigned long nr, start, size;
  38         int shift = sparse ? 5 : 0;
  39
  40         nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
  41         start = vma->vm_pgoff;
  42         size = ((pci_resource_len(pdev, num) - 1) >> (PAGE_SHIFT - shift)) + 1;
  43
  44         if (start < size && size - start >= nr)
  45                 return 1;
  46         WARN(1, "process \"%s\" tried to map%s 0x%08lx-0x%08lx on %s BAR %d "
  47                 "(size 0x%08lx)\n",
  48                 current->comm, sparse ? " sparse" : "", start, start + nr,
  49                 pci_name(pdev), num, size);
  50         return 0;
  51 }
  52
  53 /**
  54  * pci_mmap_resource - map a PCI resource into user memory space
  55  * @kobj: kobject for mapping
  56  * @attr: struct bin_attribute for the file being mapped
  57  * @vma: struct vm_area_struct passed into the mmap
  58  * @sparse: address space type
  59  *
  60  * Use the bus mapping routines to map a PCI resource into userspace.
  61  */
  62 static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
  63                              struct vm_area_struct *vma, int sparse)
  64 {
  65         struct pci_dev *pdev = to_pci_dev(container_of(kobj,
  66                                                        struct device, kobj));
  67         struct resource *res = (struct resource *)attr->private;
  68         enum pci_mmap_state mmap_type;
  69         struct pci_bus_region bar;
  70         int i;
  71
  72         for (i = 0; i < PCI_ROM_RESOURCE; i++)
  73                 if (res == &pdev->resource[i])
  74                         break;
  75         if (i >= PCI_ROM_RESOURCE)
  76                 return -ENODEV;
  77
  78         if (!__pci_mmap_fits(pdev, i, vma, sparse))
  79                 return -EINVAL;
  80
  81         if (iomem_is_exclusive(res->start))
  82                 return -EINVAL;
  83
  84         pcibios_resource_to_bus(pdev, &bar, res);
  85         vma->vm_pgoff += bar.start >> (PAGE_SHIFT - (sparse ? 5 : 0));
  86         mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
  87
  88         return hose_mmap_page_range(pdev->sysdata, vma, mmap_type, sparse);
  89 }
  90
  91 static int pci_mmap_resource_sparse(struct kobject *kobj,
  92                                     struct bin_attribute *attr,
  93                                     struct vm_area_struct *vma)
  94 {
  95         return pci_mmap_resource(kobj, attr, vma, 1);
  96 }
  97
  98 static int pci_mmap_resource_dense(struct kobject *kobj,
  99                                    struct bin_attribute *attr,
 100                                    struct vm_area_struct *vma)
 101 {
 102         return pci_mmap_resource(kobj, attr, vma, 0);
 103 }
 104
 105 /**
 106  * pci_remove_resource_files - cleanup resource files
 107  * @dev: dev to cleanup
 108  *
 109  * If we created resource files for @dev, remove them from sysfs and
 110  * free their resources.
 111  */
 112 void pci_remove_resource_files(struct pci_dev *pdev)
 113 {
 114         int i;
 115
 116         for (i = 0; i < PCI_ROM_RESOURCE; i++) {
 117                 struct bin_attribute *res_attr;
 118
 119                 res_attr = pdev->res_attr[i];
 120                 if (res_attr) {
 121                         sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
 122                         kfree(res_attr);
 123                 }
 124
 125                 res_attr = pdev->res_attr_wc[i];
 126                 if (res_attr) {
 127                         sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
 128                         kfree(res_attr);
 129                 }
 130         }
 131 }
 132
 133 static int sparse_mem_mmap_fits(struct pci_dev *pdev, int num)
 134 {
 135         struct pci_bus_region bar;
 136         struct pci_controller *hose = pdev->sysdata;
 137         long dense_offset;
 138         unsigned long sparse_size;
 139
 140         pcibios_resource_to_bus(pdev, &bar, &pdev->resource[num]);
 141
 142         /* All core logic chips have 4G sparse address space, except
 143            CIA which has 16G (see xxx_SPARSE_MEM and xxx_DENSE_MEM
 144            definitions in asm/core_xxx.h files). This corresponds
 145            to 128M or 512M of the bus space. */
 146         dense_offset = (long)(hose->dense_mem_base - hose->sparse_mem_base);
 147         sparse_size = dense_offset >= 0x400000000UL ? 0x20000000 : 0x8000000;
 148
 149         return bar.end < sparse_size;
 150 }
 151
 152 static int pci_create_one_attr(struct pci_dev *pdev, int num, char *name,
 153                                char *suffix, struct bin_attribute *res_attr,
 154                                unsigned long sparse)
 155 {
 156         size_t size = pci_resource_len(pdev, num);
 157
 158         sprintf(name, "resource%d%s", num, suffix);
 159         res_attr->mmap = sparse ? pci_mmap_resource_sparse :
 160                                   pci_mmap_resource_dense;
 161         res_attr->attr.name = name;
 162         res_attr->attr.mode = S_IRUSR | S_IWUSR;
 163         res_attr->size = sparse ? size << 5 : size;
 164         res_attr->private = &pdev->resource[num];
 165         return sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
 166 }
 167
 168 static int pci_create_attr(struct pci_dev *pdev, int num)
 169 {
 170         /* allocate attribute structure, piggyback attribute name */
 171         int retval, nlen1, nlen2 = 0, res_count = 1;
 172         unsigned long sparse_base, dense_base;
 173         struct bin_attribute *attr;
 174         struct pci_controller *hose = pdev->sysdata;
 175         char *suffix, *attr_name;
 176
 177         suffix = "";    /* Assume bwx machine, normal resourceN files. */
 178         nlen1 = 10;
 179
 180         if (pdev->resource[num].flags & IORESOURCE_MEM) {
 181                 sparse_base = hose->sparse_mem_base;
 182                 dense_base = hose->dense_mem_base;
 183                 if (sparse_base && !sparse_mem_mmap_fits(pdev, num)) {
 184                         sparse_base = 0;
 185                         suffix = "_dense";
 186                         nlen1 = 16;     /* resourceN_dense */
 187                 }
 188         } else {
 189                 sparse_base = hose->sparse_io_base;
 190                 dense_base = hose->dense_io_base;
 191         }
 192
 193         if (sparse_base) {
 194                 suffix = "_sparse";
 195                 nlen1 = 17;
 196                 if (dense_base) {
 197                         nlen2 = 16;     /* resourceN_dense */
 198                         res_count = 2;
 199                 }
 200         }
 201
 202         attr = kzalloc(sizeof(*attr) * res_count + nlen1 + nlen2, GFP_ATOMIC);
 203         if (!attr)
 204                 return -ENOMEM;
 205
 206         /* Create bwx, sparse or single dense file */
 207         attr_name = (char *)(attr + res_count);
 208         pdev->res_attr[num] = attr;
 209         retval = pci_create_one_attr(pdev, num, attr_name, suffix, attr,
 210                                      sparse_base);
 211         if (retval || res_count == 1)
 212                 return retval;
 213
 214         /* Create dense file */
 215         attr_name += nlen1;
 216         attr++;
 217         pdev->res_attr_wc[num] = attr;
 218         return pci_create_one_attr(pdev, num, attr_name, "_dense", attr, 0);
 219 }
 220
 221 /**
 222  * pci_create_resource_files - create resource files in sysfs for @dev
 223  * @dev: dev in question
 224  *
 225  * Walk the resources in @dev creating files for each resource available.
 226  */
 227 int pci_create_resource_files(struct pci_dev *pdev)
 228 {
 229         int i;
 230         int retval;
 231
 232         /* Expose the PCI resources from this device as files */
 233         for (i = 0; i < PCI_ROM_RESOURCE; i++) {
 234
 235                 /* skip empty resources */
 236                 if (!pci_resource_len(pdev, i))
 237                         continue;
 238
 239                 retval = pci_create_attr(pdev, i);
 240                 if (retval) {
 241                         pci_remove_resource_files(pdev);
 242                         return retval;
 243                 }
 244         }
 245         return 0;
 246 }
 247
 248 /* Legacy I/O bus mapping stuff. */
 249
 250 static int __legacy_mmap_fits(struct pci_controller *hose,
 251                               struct vm_area_struct *vma,
 252                               unsigned long res_size, int sparse)
 253 {
 254         unsigned long nr, start, size;
 255
 256         nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
 257         start = vma->vm_pgoff;
 258         size = ((res_size - 1) >> PAGE_SHIFT) + 1;
 259
 260         if (start < size && size - start >= nr)
 261                 return 1;
 262         WARN(1, "process \"%s\" tried to map%s 0x%08lx-0x%08lx on hose %d "
 263                 "(size 0x%08lx)\n",
 264                 current->comm, sparse ? " sparse" : "", start, start + nr,
 265                 hose->index, size);
 266         return 0;
 267 }
 268
 269 static inline int has_sparse(struct pci_controller *hose,
 270                              enum pci_mmap_state mmap_type)
 271 {
 272         unsigned long base;
 273
 274         base = (mmap_type == pci_mmap_mem) ? hose->sparse_mem_base :
 275                                              hose->sparse_io_base;
 276
 277         return base != 0;
 278 }
 279
 280 int pci_mmap_legacy_page_range(struct pci_bus *bus, struct vm_area_struct *vma,
 281                                enum pci_mmap_state mmap_type)
 282 {
 283         struct pci_controller *hose = bus->sysdata;
 284         int sparse = has_sparse(hose, mmap_type);
 285         unsigned long res_size;
 286
 287         res_size = (mmap_type == pci_mmap_mem) ? bus->legacy_mem->size :
 288                                                  bus->legacy_io->size;
 289         if (!__legacy_mmap_fits(hose, vma, res_size, sparse))
 290                 return -EINVAL;
 291
 292         return hose_mmap_page_range(hose, vma, mmap_type, sparse);
 293 }
 294
 295 /**
 296  * pci_adjust_legacy_attr - adjustment of legacy file attributes
 297  * @b: bus to create files under
 298  * @mmap_type: I/O port or memory
 299  *
 300  * Adjust file name and size for sparse mappings.
 301  */
 302 void pci_adjust_legacy_attr(struct pci_bus *bus, enum pci_mmap_state mmap_type)
 303 {
 304         struct pci_controller *hose = bus->sysdata;
 305
 306         if (!has_sparse(hose, mmap_type))
 307                 return;
 308
 309         if (mmap_type == pci_mmap_mem) {
 310                 bus->legacy_mem->attr.name = "legacy_mem_sparse";
 311                 bus->legacy_mem->size <<= 5;
 312         } else {
 313                 bus->legacy_io->attr.name = "legacy_io_sparse";
 314                 bus->legacy_io->size <<= 5;
 315         }
 316         return;
 317 }
 318
 319 /* Legacy I/O bus read/write functions */
 320 int pci_legacy_read(struct pci_bus *bus, loff_t port, u32 *val, size_t size)
 321 {
 322         struct pci_controller *hose = bus->sysdata;
 323
 324         port += hose->io_space->start;
 325
 326         switch(size) {
 327         case 1:
 328                 *((u8 *)val) = inb(port);
 329                 return 1;
 330         case 2:
 331                 if (port & 1)
 332                         return -EINVAL;
 333                 *((u16 *)val) = inw(port);
 334                 return 2;
 335         case 4:
 336                 if (port & 3)
 337                         return -EINVAL;
 338                 *((u32 *)val) = inl(port);
 339                 return 4;
 340         }
 341         return -EINVAL;
 342 }
 343
 344 int pci_legacy_write(struct pci_bus *bus, loff_t port, u32 val, size_t size)
 345 {
 346         struct pci_controller *hose = bus->sysdata;
 347
 348         port += hose->io_space->start;
 349
 350         switch(size) {
 351         case 1:
 352                 outb(port, val);
 353                 return 1;
 354         case 2:
 355                 if (port & 1)
 356                         return -EINVAL;
 357                 outw(port, val);
 358                 return 2;
 359         case 4:
 360                 if (port & 3)
 361                         return -EINVAL;
 362                 outl(port, val);
 363                 return 4;
 364         }
 365         return -EINVAL;
 366 }