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 
27 struct pci_controller *hose_head, **hose_tail = &hose_head;
28 struct pci_controller *pci_isa_hose;
29 
30 
31 struct pci_controller * __init
alloc_pci_controller(void)32 alloc_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 
47 struct resource * __init
alloc_resource(void)48 alloc_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 
SYSCALL_DEFINE3(pciconfig_iobase,long,which,unsigned long,bus,unsigned long,dfn)59 SYSCALL_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 
SYSCALL_DEFINE5(pciconfig_read,unsigned long,bus,unsigned long,dfn,unsigned long,off,unsigned long,len,void __user *,buf)97 SYSCALL_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 
SYSCALL_DEFINE5(pciconfig_write,unsigned long,bus,unsigned long,dfn,unsigned long,off,unsigned long,len,void __user *,buf)106 SYSCALL_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