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         struct resource *res;
  46
  47         res = alloc_bootmem(sizeof(*res));
  48
  49         return res;
  50 }
  51
  52 asmlinkage long
  53 sys_pciconfig_iobase(long which, unsigned long bus, unsigned long dfn)
  54 {
  55         struct pci_controller *hose;
  56
  57         /* from hose or from bus.devfn */
  58         if (which & IOBASE_FROM_HOSE) {
  59                 for (hose = hose_head; hose; hose = hose->next)
  60                         if (hose->index == bus)
  61                                 break;
  62                 if (!hose)
  63                         return -ENODEV;
  64         } else {
  65                 /* Special hook for ISA access.  */
  66                 if (bus == 0 && dfn == 0)
  67                         hose = pci_isa_hose;
  68                 else
  69                         return -ENODEV;
  70         }
  71
  72         switch (which & ~IOBASE_FROM_HOSE) {
  73         case IOBASE_HOSE:
  74                 return hose->index;
  75         case IOBASE_SPARSE_MEM:
  76                 return hose->sparse_mem_base;
  77         case IOBASE_DENSE_MEM:
  78                 return hose->dense_mem_base;
  79         case IOBASE_SPARSE_IO:
  80                 return hose->sparse_io_base;
  81         case IOBASE_DENSE_IO:
  82                 return hose->dense_io_base;
  83         case IOBASE_ROOT_BUS:
  84                 return hose->bus->number;
  85         }
  86
  87         return -EOPNOTSUPP;
  88 }
  89
  90 asmlinkage long
  91 sys_pciconfig_read(unsigned long bus, unsigned long dfn,
  92                    unsigned long off, unsigned long len, void *buf)
  93 {
  94         if (!capable(CAP_SYS_ADMIN))
  95                 return -EPERM;
  96         else
  97                 return -ENODEV;
  98 }
  99
 100 asmlinkage long
 101 sys_pciconfig_write(unsigned long bus, unsigned long dfn,
 102                     unsigned long off, unsigned long len, void *buf)
 103 {
 104         if (!capable(CAP_SYS_ADMIN))
 105                 return -EPERM;
 106         else
 107                 return -ENODEV;
 108 }
 109
 110 static void *alpha_noop_alloc_coherent(struct device *dev, size_t size,
 111                                        dma_addr_t *dma_handle, gfp_t gfp,
 112                                        struct dma_attrs *attrs)
 113 {
 114         void *ret;
 115
 116         if (!dev || *dev->dma_mask >= 0xffffffffUL)
 117                 gfp &= ~GFP_DMA;
 118         ret = (void *)__get_free_pages(gfp, get_order(size));
 119         if (ret) {
 120                 memset(ret, 0, size);
 121                 *dma_handle = virt_to_phys(ret);
 122         }
 123         return ret;
 124 }
 125
 126 static void alpha_noop_free_coherent(struct device *dev, size_t size,
 127                                      void *cpu_addr, dma_addr_t dma_addr,
 128                                      struct dma_attrs *attrs)
 129 {
 130         free_pages((unsigned long)cpu_addr, get_order(size));
 131 }
 132
 133 static dma_addr_t alpha_noop_map_page(struct device *dev, struct page *page,
 134                                       unsigned long offset, size_t size,
 135                                       enum dma_data_direction dir,
 136                                       struct dma_attrs *attrs)
 137 {
 138         return page_to_pa(page) + offset;
 139 }
 140
 141 static int alpha_noop_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
 142                              enum dma_data_direction dir, struct dma_attrs *attrs)
 143 {
 144         int i;
 145         struct scatterlist *sg;
 146
 147         for_each_sg(sgl, sg, nents, i) {
 148                 void *va;
 149
 150                 BUG_ON(!sg_page(sg));
 151                 va = sg_virt(sg);
 152                 sg_dma_address(sg) = (dma_addr_t)virt_to_phys(va);
 153                 sg_dma_len(sg) = sg->length;
 154         }
 155
 156         return nents;
 157 }
 158
 159 static int alpha_noop_mapping_error(struct device *dev, dma_addr_t dma_addr)
 160 {
 161         return 0;
 162 }
 163
 164 static int alpha_noop_supported(struct device *dev, u64 mask)
 165 {
 166         return mask < 0x00ffffffUL ? 0 : 1;
 167 }
 168
 169 struct dma_map_ops alpha_noop_ops = {
 170         .alloc                  = alpha_noop_alloc_coherent,
 171         .free                   = alpha_noop_free_coherent,
 172         .map_page               = alpha_noop_map_page,
 173         .map_sg                 = alpha_noop_map_sg,
 174         .mapping_error          = alpha_noop_mapping_error,
 175         .dma_supported          = alpha_noop_supported,
 176 };
 177
 178 struct dma_map_ops *dma_ops = &alpha_noop_ops;
 179 EXPORT_SYMBOL(dma_ops);