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/slab.h>
  14 #include <linux/pci.h>
  15
  16 static int hose_mmap_page_range(struct pci_controller *hose,
  17                                 struct vm_area_struct *vma,
  18                                 enum pci_mmap_state mmap_type, int sparse)
  19 {
  20         unsigned long base;
  21
  22         if (mmap_type == pci_mmap_mem)
  23                 base = sparse ? hose->sparse_mem_base : hose->dense_mem_base;
  24         else
  25                 base = sparse ? hose->sparse_io_base : hose->dense_io_base;
  26
  27         vma->vm_pgoff += base >> PAGE_SHIFT;
  28         vma->vm_flags |= (VM_IO | VM_RESERVED);
  29
  30         return io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
  31                                   vma->vm_end - vma->vm_start,
  32                                   vma->vm_page_prot);
  33 }
  34
  35 static int __pci_mmap_fits(struct pci_dev *pdev, int num,
  36                            struct vm_area_struct *vma, int sparse)
  37 {
  38         unsigned long nr, start, size;
  39         int shift = sparse ? 5 : 0;
  40
  41         nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
  42         start = vma->vm_pgoff;
  43         size = ((pci_resource_len(pdev, num) - 1) >> (PAGE_SHIFT - shift)) + 1;
  44
  45         if (start < size && size - start >= nr)
  46                 return 1;
  47         WARN(1, "process \"%s\" tried to map%s 0x%08lx-0x%08lx on %s BAR %d "
  48                 "(size 0x%08lx)\n",
  49                 current->comm, sparse ? " sparse" : "", start, start + nr,
  50                 pci_name(pdev), num, size);
  51         return 0;
  52 }
  53
  54 /**
  55  * pci_mmap_resource - map a PCI resource into user memory space
  56  * @kobj: kobject for mapping
  57  * @attr: struct bin_attribute for the file being mapped
  58  * @vma: struct vm_area_struct passed into the mmap
  59  * @sparse: address space type
  60  *
  61  * Use the bus mapping routines to map a PCI resource into userspace.
  62  */
  63 static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
  64                              struct vm_area_struct *vma, int sparse)
  65 {
  66         struct pci_dev *pdev = to_pci_dev(container_of(kobj,
  67                                                        struct device, kobj));
  68         struct resource *res = (struct resource *)attr->private;
  69         enum pci_mmap_state mmap_type;
  70         struct pci_bus_region bar;
  71         int i;
  72
  73         for (i = 0; i < PCI_ROM_RESOURCE; i++)
  74                 if (res == &pdev->resource[i])
  75                         break;
  76         if (i >= PCI_ROM_RESOURCE)
  77                 return -ENODEV;
  78
  79         if (!__pci_mmap_fits(pdev, i, vma, sparse))
  80                 return -EINVAL;
  81
  82         if (iomem_is_exclusive(res->start))
  83                 return -EINVAL;
  84
  85         pcibios_resource_to_bus(pdev, &bar, res);
  86         vma->vm_pgoff += bar.start >> (PAGE_SHIFT - (sparse ? 5 : 0));
  87         mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
  88
  89         return hose_mmap_page_range(pdev->sysdata, vma, mmap_type, sparse);
  90 }
  91
  92 static int pci_mmap_resource_sparse(struct kobject *kobj,
  93                                     struct bin_attribute *attr,
  94                                     struct vm_area_struct *vma)
  95 {
  96         return pci_mmap_resource(kobj, attr, vma, 1);
  97 }
  98
  99 static int pci_mmap_resource_dense(struct kobject *kobj,
 100                                    struct bin_attribute *attr,
 101                                    struct vm_area_struct *vma)
 102 {
 103         return pci_mmap_resource(kobj, attr, vma, 0);
 104 }
 105
 106 /**
 107  * pci_remove_resource_files - cleanup resource files
 108  * @dev: dev to cleanup
 109  *
 110  * If we created resource files for @dev, remove them from sysfs and
 111  * free their resources.
 112  */
 113 void pci_remove_resource_files(struct pci_dev *pdev)
 114 {
 115         int i;
 116
 117         for (i = 0; i < PCI_ROM_RESOURCE; i++) {
 118                 struct bin_attribute *res_attr;
 119
 120                 res_attr = pdev->res_attr[i];
 121                 if (res_attr) {
 122                         sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
 123                         kfree(res_attr);
 124                 }
 125
 126                 res_attr = pdev->res_attr_wc[i];
 127                 if (res_attr) {
 128                         sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
 129                         kfree(res_attr);
 130                 }
 131         }
 132 }
 133
 134 static int sparse_mem_mmap_fits(struct pci_dev *pdev, int num)
 135 {
 136         struct pci_bus_region bar;
 137         struct pci_controller *hose = pdev->sysdata;
 138         long dense_offset;
 139         unsigned long sparse_size;
 140
 141         pcibios_resource_to_bus(pdev, &bar, &pdev->resource[num]);
 142
 143         /* All core logic chips have 4G sparse address space, except
 144            CIA which has 16G (see xxx_SPARSE_MEM and xxx_DENSE_MEM
 145            definitions in asm/core_xxx.h files). This corresponds
 146            to 128M or 512M of the bus space. */
 147         dense_offset = (long)(hose->dense_mem_base - hose->sparse_mem_base);
 148         sparse_size = dense_offset >= 0x400000000UL ? 0x20000000 : 0x8000000;
 149
 150         return bar.end < sparse_size;
 151 }
 152
 153 static int pci_create_one_attr(struct pci_dev *pdev, int num, char *name,
 154                                char *suffix, struct bin_attribute *res_attr,
 155                                unsigned long sparse)
 156 {
 157         size_t size = pci_resource_len(pdev, num);
 158
 159         sprintf(name, "resource%d%s", num, suffix);
 160         res_attr->mmap = sparse ? pci_mmap_resource_sparse :
 161                                   pci_mmap_resource_dense;
 162         res_attr->attr.name = name;
 163         res_attr->attr.mode = S_IRUSR | S_IWUSR;
 164         res_attr->size = sparse ? size << 5 : size;
 165         res_attr->private = &pdev->resource[num];
 166         return sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
 167 }
 168
 169 static int pci_create_attr(struct pci_dev *pdev, int num)
 170 {
 171         /* allocate attribute structure, piggyback attribute name */
 172         int retval, nlen1, nlen2 = 0, res_count = 1;
 173         unsigned long sparse_base, dense_base;
 174         struct bin_attribute *attr;
 175         struct pci_controller *hose = pdev->sysdata;
 176         char *suffix, *attr_name;
 177
 178         suffix = "";    /* Assume bwx machine, normal resourceN files. */
 179         nlen1 = 10;
 180
 181         if (pdev->resource[num].flags & IORESOURCE_MEM) {
 182                 sparse_base = hose->sparse_mem_base;
 183                 dense_base = hose->dense_mem_base;
 184                 if (sparse_base && !sparse_mem_mmap_fits(pdev, num)) {
 185                         sparse_base = 0;
 186                         suffix = "_dense";
 187                         nlen1 = 16;     /* resourceN_dense */
 188                 }
 189         } else {
 190                 sparse_base = hose->sparse_io_base;
 191                 dense_base = hose->dense_io_base;
 192         }
 193
 194         if (sparse_base) {
 195                 suffix = "_sparse";
 196                 nlen1 = 17;
 197                 if (dense_base) {
 198                         nlen2 = 16;     /* resourceN_dense */
 199                         res_count = 2;
 200                 }
 201         }
 202
 203         attr = kzalloc(sizeof(*attr) * res_count + nlen1 + nlen2, GFP_ATOMIC);
 204         if (!attr)
 205                 return -ENOMEM;
 206
 207         /* Create bwx, sparse or single dense file */
 208         attr_name = (char *)(attr + res_count);
 209         pdev->res_attr[num] = attr;
 210         retval = pci_create_one_attr(pdev, num, attr_name, suffix, attr,
 211                                      sparse_base);
 212         if (retval || res_count == 1)
 213                 return retval;
 214
 215         /* Create dense file */
 216         attr_name += nlen1;
 217         attr++;
 218         pdev->res_attr_wc[num] = attr;
 219         return pci_create_one_attr(pdev, num, attr_name, "_dense", attr, 0);
 220 }
 221
 222 /**
 223  * pci_create_resource_files - create resource files in sysfs for @dev
 224  * @dev: dev in question
 225  *
 226  * Walk the resources in @dev creating files for each resource available.
 227  */
 228 int pci_create_resource_files(struct pci_dev *pdev)
 229 {
 230         int i;
 231         int retval;
 232
 233         /* Expose the PCI resources from this device as files */
 234         for (i = 0; i < PCI_ROM_RESOURCE; i++) {
 235
 236                 /* skip empty resources */
 237                 if (!pci_resource_len(pdev, i))
 238                         continue;
 239
 240                 retval = pci_create_attr(pdev, i);
 241                 if (retval) {
 242                         pci_remove_resource_files(pdev);
 243                         return retval;
 244                 }
 245         }
 246         return 0;
 247 }
 248
 249 /* Legacy I/O bus mapping stuff. */
 250
 251 static int __legacy_mmap_fits(struct pci_controller *hose,
 252                               struct vm_area_struct *vma,
 253                               unsigned long res_size, int sparse)
 254 {
 255         unsigned long nr, start, size;
 256
 257         nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
 258         start = vma->vm_pgoff;
 259         size = ((res_size - 1) >> PAGE_SHIFT) + 1;
 260
 261         if (start < size && size - start >= nr)
 262                 return 1;
 263         WARN(1, "process \"%s\" tried to map%s 0x%08lx-0x%08lx on hose %d "
 264                 "(size 0x%08lx)\n",
 265                 current->comm, sparse ? " sparse" : "", start, start + nr,
 266                 hose->index, size);
 267         return 0;
 268 }
 269
 270 static inline int has_sparse(struct pci_controller *hose,
 271                              enum pci_mmap_state mmap_type)
 272 {
 273         unsigned long base;
 274
 275         base = (mmap_type == pci_mmap_mem) ? hose->sparse_mem_base :
 276                                              hose->sparse_io_base;
 277
 278         return base != 0;
 279 }
 280
 281 int pci_mmap_legacy_page_range(struct pci_bus *bus, struct vm_area_struct *vma,
 282                                enum pci_mmap_state mmap_type)
 283 {
 284         struct pci_controller *hose = bus->sysdata;
 285         int sparse = has_sparse(hose, mmap_type);
 286         unsigned long res_size;
 287
 288         res_size = (mmap_type == pci_mmap_mem) ? bus->legacy_mem->size :
 289                                                  bus->legacy_io->size;
 290         if (!__legacy_mmap_fits(hose, vma, res_size, sparse))
 291                 return -EINVAL;
 292
 293         return hose_mmap_page_range(hose, vma, mmap_type, sparse);
 294 }
 295
 296 /**
 297  * pci_adjust_legacy_attr - adjustment of legacy file attributes
 298  * @b: bus to create files under
 299  * @mmap_type: I/O port or memory
 300  *
 301  * Adjust file name and size for sparse mappings.
 302  */
 303 void pci_adjust_legacy_attr(struct pci_bus *bus, enum pci_mmap_state mmap_type)
 304 {
 305         struct pci_controller *hose = bus->sysdata;
 306
 307         if (!has_sparse(hose, mmap_type))
 308                 return;
 309
 310         if (mmap_type == pci_mmap_mem) {
 311                 bus->legacy_mem->attr.name = "legacy_mem_sparse";
 312                 bus->legacy_mem->size <<= 5;
 313         } else {
 314                 bus->legacy_io->attr.name = "legacy_io_sparse";
 315                 bus->legacy_io->size <<= 5;
 316         }
 317         return;
 318 }
 319
 320 /* Legacy I/O bus read/write functions */
 321 int pci_legacy_read(struct pci_bus *bus, loff_t port, u32 *val, size_t size)
 322 {
 323         struct pci_controller *hose = bus->sysdata;
 324
 325         port += hose->io_space->start;
 326
 327         switch(size) {
 328         case 1:
 329                 *((u8 *)val) = inb(port);
 330                 return 1;
 331         case 2:
 332                 if (port & 1)
 333                         return -EINVAL;
 334                 *((u16 *)val) = inw(port);
 335                 return 2;
 336         case 4:
 337                 if (port & 3)
 338                         return -EINVAL;
 339                 *((u32 *)val) = inl(port);
 340                 return 4;
 341         }
 342         return -EINVAL;
 343 }
 344
 345 int pci_legacy_write(struct pci_bus *bus, loff_t port, u32 val, size_t size)
 346 {
 347         struct pci_controller *hose = bus->sysdata;
 348
 349         port += hose->io_space->start;
 350
 351         switch(size) {
 352         case 1:
 353                 outb(port, val);
 354                 return 1;
 355         case 2:
 356                 if (port & 1)
 357                         return -EINVAL;
 358                 outw(port, val);
 359                 return 2;
 360         case 4:
 361                 if (port & 3)
 362                         return -EINVAL;
 363                 outl(port, val);
 364                 return 4;
 365         }
 366         return -EINVAL;
 367 }