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/memblock.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 = memblock_alloc(sizeof(*hose), SMP_CACHE_BYTES);
 37	if (!hose)
 38		panic("%s: Failed to allocate %zu bytes\n", __func__,
 39		      sizeof(*hose));
 40
 41	*hose_tail = hose;
 42	hose_tail = &hose->next;
 43
 44	return hose;
 45}
 46
 47struct resource * __init
 48alloc_resource(void)
 49{
 50	void *ptr = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
 51
 52	if (!ptr)
 53		panic("%s: Failed to allocate %zu bytes\n", __func__,
 54		      sizeof(struct resource));
 55
 56	return ptr;
 57}
 58
 59SYSCALL_DEFINE3(pciconfig_iobase, long, which, unsigned long, bus,
 60		unsigned long, dfn)
 61{
 62	struct pci_controller *hose;
 63
 64	/* from hose or from bus.devfn */
 65	if (which & IOBASE_FROM_HOSE) {
 66		for (hose = hose_head; hose; hose = hose->next)
 67			if (hose->index == bus)
 68				break;
 69		if (!hose)
 70			return -ENODEV;
 71	} else {
 72		/* Special hook for ISA access.  */
 73		if (bus == 0 && dfn == 0)
 74			hose = pci_isa_hose;
 75		else
 76			return -ENODEV;
 77	}
 78
 79	switch (which & ~IOBASE_FROM_HOSE) {
 80	case IOBASE_HOSE:
 81		return hose->index;
 82	case IOBASE_SPARSE_MEM:
 83		return hose->sparse_mem_base;
 84	case IOBASE_DENSE_MEM:
 85		return hose->dense_mem_base;
 86	case IOBASE_SPARSE_IO:
 87		return hose->sparse_io_base;
 88	case IOBASE_DENSE_IO:
 89		return hose->dense_io_base;
 90	case IOBASE_ROOT_BUS:
 91		return hose->bus->number;
 92	}
 93
 94	return -EOPNOTSUPP;
 95}
 96
 97SYSCALL_DEFINE5(pciconfig_read, 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
106SYSCALL_DEFINE5(pciconfig_write, unsigned long, bus, unsigned long, dfn,
107		unsigned long, off, unsigned long, len, void __user *, buf)
108{
109	if (!capable(CAP_SYS_ADMIN))
110		return -EPERM;
111	else
112		return -ENODEV;
113}