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}
114