LXR linux/arch/alpha/kernel/pci-noop.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 *      linux/arch/alpha/kernel/pci-noop.c
   4 *
   5 * Stub PCI interfaces for Jensen-specific kernels.
   6 */
   7
   8#include <linux/pci.h>
   9#include <linux/init.h>
  10#include <linux/bootmem.h>
  11#include <linux/gfp.h>
  12#include <linux/capability.h>
  13#include <linux/mm.h>
  14#include <linux/errno.h>
  15#include <linux/sched.h>
  16#include <linux/dma-mapping.h>
  17#include <linux/scatterlist.h>
  18
  19#include "proto.h"
  20
  21
  22/*
  23 * The PCI controller list.
  24 */
  25
  26struct pci_controller *hose_head, **hose_tail = &hose_head;
  27struct pci_controller *pci_isa_hose;
  28
  29
  30struct pci_controller * __init
  31alloc_pci_controller(void)
  32{
  33        struct pci_controller *hose;
  34
  35        hose = alloc_bootmem(sizeof(*hose));
  36
  37        *hose_tail = hose;
  38        hose_tail = &hose->next;
  39
  40        return hose;
  41}
  42
  43struct resource * __init
  44alloc_resource(void)
  45{
  46        return alloc_bootmem(sizeof(struct resource));
  47}
  48
  49asmlinkage long
  50sys_pciconfig_iobase(long which, unsigned long bus, unsigned long dfn)
  51{
  52        struct pci_controller *hose;
  53
  54        /* from hose or from bus.devfn */
  55        if (which & IOBASE_FROM_HOSE) {
  56                for (hose = hose_head; hose; hose = hose->next) 
  57                        if (hose->index == bus)
  58                                break;
  59                if (!hose)
  60                        return -ENODEV;
  61        } else {
  62                /* Special hook for ISA access.  */
  63                if (bus == 0 && dfn == 0)
  64                        hose = pci_isa_hose;
  65                else
  66                        return -ENODEV;
  67        }
  68
  69        switch (which & ~IOBASE_FROM_HOSE) {
  70        case IOBASE_HOSE:
  71                return hose->index;
  72        case IOBASE_SPARSE_MEM:
  73                return hose->sparse_mem_base;
  74        case IOBASE_DENSE_MEM:
  75                return hose->dense_mem_base;
  76        case IOBASE_SPARSE_IO:
  77                return hose->sparse_io_base;
  78        case IOBASE_DENSE_IO:
  79                return hose->dense_io_base;
  80        case IOBASE_ROOT_BUS:
  81                return hose->bus->number;
  82        }
  83
  84        return -EOPNOTSUPP;
  85}
  86
  87asmlinkage long
  88sys_pciconfig_read(unsigned long bus, unsigned long dfn,
  89                   unsigned long off, unsigned long len, void *buf)
  90{
  91        if (!capable(CAP_SYS_ADMIN))
  92                return -EPERM;
  93        else
  94                return -ENODEV;
  95}
  96
  97asmlinkage long
  98sys_pciconfig_write(unsigned long bus, unsigned long dfn,
  99                    unsigned long off, unsigned long len, void *buf)
 100{
 101        if (!capable(CAP_SYS_ADMIN))
 102                return -EPERM;
 103        else
 104                return -ENODEV;
 105}
 106
 107static void *alpha_noop_alloc_coherent(struct device *dev, size_t size,
 108                                       dma_addr_t *dma_handle, gfp_t gfp,
 109                                       unsigned long attrs)
 110{
 111        void *ret;
 112
 113        if (!dev || *dev->dma_mask >= 0xffffffffUL)
 114                gfp &= ~GFP_DMA;
 115        ret = (void *)__get_free_pages(gfp, get_order(size));
 116        if (ret) {
 117                memset(ret, 0, size);
 118                *dma_handle = virt_to_phys(ret);
 119        }
 120        return ret;
 121}
 122
 123static int alpha_noop_supported(struct device *dev, u64 mask)
 124{
 125        return mask < 0x00ffffffUL ? 0 : 1;
 126}
 127
 128const struct dma_map_ops alpha_noop_ops = {
 129        .alloc                  = alpha_noop_alloc_coherent,
 130        .free                   = dma_noop_free_coherent,
 131        .map_page               = dma_noop_map_page,
 132        .map_sg                 = dma_noop_map_sg,
 133        .mapping_error          = dma_noop_mapping_error,
 134        .dma_supported          = alpha_noop_supported,
 135};
 136
 137const struct dma_map_ops *dma_ops = &alpha_noop_ops;
 138EXPORT_SYMBOL(dma_ops);
 139