arch/alpha/kernel/pci-noop.c

   1 /*
   2  *      linux/arch/alpha/kernel/pci-noop.c
   3  *
   4  * Stub PCI interfaces for Jensen-specific kernels.
   5  */
   6
   7 #include <linux/pci.h>
   8 #include <linux/init.h>
   9 #include <linux/bootmem.h>
  10 #include <linux/gfp.h>
  11 #include <linux/capability.h>
  12 #include <linux/mm.h>
  13 #include <linux/errno.h>
  14 #include <linux/sched.h>
  15 #include <linux/dma-mapping.h>
  16 #include <linux/scatterlist.h>
  17
  18 #include "proto.h"
  19
  20
  21 /*
  22  * The PCI controller list.
  23  */
  24
  25 struct pci_controller *hose_head, **hose_tail = &hose_head;
  26 struct pci_controller *pci_isa_hose;
  27
  28
  29 struct pci_controller * __init
  30 alloc_pci_controller(void)
  31 {
  32         struct pci_controller *hose;
  33
  34         hose = alloc_bootmem(sizeof(*hose));
  35
  36         *hose_tail = hose;
  37         hose_tail = &hose->next;
  38
  39         return hose;
  40 }
  41
  42 struct resource * __init
  43 alloc_resource(void)
  44 {
  45         return alloc_bootmem(sizeof(struct resource));
  46 }
  47
  48 asmlinkage long
  49 sys_pciconfig_iobase(long which, unsigned long bus, unsigned long dfn)
  50 {
  51         struct pci_controller *hose;
  52
  53         /* from hose or from bus.devfn */
  54         if (which & IOBASE_FROM_HOSE) {
  55                 for (hose = hose_head; hose; hose = hose->next)
  56                         if (hose->index == bus)
  57                                 break;
  58                 if (!hose)
  59                         return -ENODEV;
  60         } else {
  61                 /* Special hook for ISA access.  */
  62                 if (bus == 0 && dfn == 0)
  63                         hose = pci_isa_hose;
  64                 else
  65                         return -ENODEV;
  66         }
  67
  68         switch (which & ~IOBASE_FROM_HOSE) {
  69         case IOBASE_HOSE:
  70                 return hose->index;
  71         case IOBASE_SPARSE_MEM:
  72                 return hose->sparse_mem_base;
  73         case IOBASE_DENSE_MEM:
  74                 return hose->dense_mem_base;
  75         case IOBASE_SPARSE_IO:
  76                 return hose->sparse_io_base;
  77         case IOBASE_DENSE_IO:
  78                 return hose->dense_io_base;
  79         case IOBASE_ROOT_BUS:
  80                 return hose->bus->number;
  81         }
  82
  83         return -EOPNOTSUPP;
  84 }
  85
  86 asmlinkage long
  87 sys_pciconfig_read(unsigned long bus, unsigned long dfn,
  88                    unsigned long off, unsigned long len, void *buf)
  89 {
  90         if (!capable(CAP_SYS_ADMIN))
  91                 return -EPERM;
  92         else
  93                 return -ENODEV;
  94 }
  95
  96 asmlinkage long
  97 sys_pciconfig_write(unsigned long bus, unsigned long dfn,
  98                     unsigned long off, unsigned long len, void *buf)
  99 {
 100         if (!capable(CAP_SYS_ADMIN))
 101                 return -EPERM;
 102         else
 103                 return -ENODEV;
 104 }
 105
 106 static void *alpha_noop_alloc_coherent(struct device *dev, size_t size,
 107                                        dma_addr_t *dma_handle, gfp_t gfp,
 108                                        unsigned long attrs)
 109 {
 110         void *ret;
 111
 112         if (!dev || *dev->dma_mask >= 0xffffffffUL)
 113                 gfp &= ~GFP_DMA;
 114         ret = (void *)__get_free_pages(gfp, get_order(size));
 115         if (ret) {
 116                 memset(ret, 0, size);
 117                 *dma_handle = virt_to_phys(ret);
 118         }
 119         return ret;
 120 }
 121
 122 static int alpha_noop_supported(struct device *dev, u64 mask)
 123 {
 124         return mask < 0x00ffffffUL ? 0 : 1;
 125 }
 126
 127 const struct dma_map_ops alpha_noop_ops = {
 128         .alloc                  = alpha_noop_alloc_coherent,
 129         .free                   = dma_noop_free_coherent,
 130         .map_page               = dma_noop_map_page,
 131         .map_sg                 = dma_noop_map_sg,
 132         .mapping_error          = dma_noop_mapping_error,
 133         .dma_supported          = alpha_noop_supported,
 134 };
 135
 136 const struct dma_map_ops *dma_ops = &alpha_noop_ops;
 137 EXPORT_SYMBOL(dma_ops);