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#include <linux/syscalls.h>
  19
  20#include "proto.h"
  21
  22
  23/*
  24 * The PCI controller list.
  25 */
  26
  27struct pci_controller *hose_head, **hose_tail = &hose_head;
  28struct pci_controller *pci_isa_hose;
  29
  30
  31struct pci_controller * __init
  32alloc_pci_controller(void)
  33{
  34        struct pci_controller *hose;
  35
  36        hose = alloc_bootmem(sizeof(*hose));
  37
  38        *hose_tail = hose;
  39        hose_tail = &hose->next;
  40
  41        return hose;
  42}
  43
  44struct resource * __init
  45alloc_resource(void)
  46{
  47        return alloc_bootmem(sizeof(struct resource));
  48}
  49
  50SYSCALL_DEFINE3(pciconfig_iobase, long, which, unsigned long, bus,
  51                unsigned long, dfn)
  52{
  53        struct pci_controller *hose;
  54
  55        /* from hose or from bus.devfn */
  56        if (which & IOBASE_FROM_HOSE) {
  57                for (hose = hose_head; hose; hose = hose->next) 
  58                        if (hose->index == bus)
  59                                break;
  60                if (!hose)
  61                        return -ENODEV;
  62        } else {
  63                /* Special hook for ISA access.  */
  64                if (bus == 0 && dfn == 0)
  65                        hose = pci_isa_hose;
  66                else
  67                        return -ENODEV;
  68        }
  69
  70        switch (which & ~IOBASE_FROM_HOSE) {
  71        case IOBASE_HOSE:
  72                return hose->index;
  73        case IOBASE_SPARSE_MEM:
  74                return hose->sparse_mem_base;
  75        case IOBASE_DENSE_MEM:
  76                return hose->dense_mem_base;
  77        case IOBASE_SPARSE_IO:
  78                return hose->sparse_io_base;
  79        case IOBASE_DENSE_IO:
  80                return hose->dense_io_base;
  81        case IOBASE_ROOT_BUS:
  82                return hose->bus->number;
  83        }
  84
  85        return -EOPNOTSUPP;
  86}
  87
  88SYSCALL_DEFINE5(pciconfig_read, unsigned long, bus, unsigned long, dfn,
  89                unsigned long, off, unsigned long, len, void __user *, buf)
  90{
  91        if (!capable(CAP_SYS_ADMIN))
  92                return -EPERM;
  93        else
  94                return -ENODEV;
  95}
  96
  97SYSCALL_DEFINE5(pciconfig_write, unsigned long, bus, unsigned long, dfn,
  98                unsigned long, off, unsigned long, len, void __user *, buf)
  99{
 100        if (!capable(CAP_SYS_ADMIN))
 101                return -EPERM;
 102        else
 103                return -ENODEV;
 104}
 105