1// SPDX-License-Identifier: GPL-2.0+
2
3#include <linux/io.h>
4#include "ipmi_si.h"
5
6static unsigned char port_inb(const struct si_sm_io *io, unsigned int offset)
7{
8 unsigned int addr = io->addr_data;
9
10 return inb(port: addr + (offset * io->regspacing));
11}
12
13static void port_outb(const struct si_sm_io *io, unsigned int offset,
14 unsigned char b)
15{
16 unsigned int addr = io->addr_data;
17
18 outb(value: b, port: addr + (offset * io->regspacing));
19}
20
21static unsigned char port_inw(const struct si_sm_io *io, unsigned int offset)
22{
23 unsigned int addr = io->addr_data;
24
25 return (inw(port: addr + (offset * io->regspacing)) >> io->regshift) & 0xff;
26}
27
28static void port_outw(const struct si_sm_io *io, unsigned int offset,
29 unsigned char b)
30{
31 unsigned int addr = io->addr_data;
32
33 outw(value: b << io->regshift, port: addr + (offset * io->regspacing));
34}
35
36static unsigned char port_inl(const struct si_sm_io *io, unsigned int offset)
37{
38 unsigned int addr = io->addr_data;
39
40 return (inl(port: addr + (offset * io->regspacing)) >> io->regshift) & 0xff;
41}
42
43static void port_outl(const struct si_sm_io *io, unsigned int offset,
44 unsigned char b)
45{
46 unsigned int addr = io->addr_data;
47
48 outl(value: b << io->regshift, port: addr+(offset * io->regspacing));
49}
50
51static void port_cleanup(struct si_sm_io *io)
52{
53 unsigned int addr = io->addr_data;
54 int idx;
55
56 if (addr) {
57 for (idx = 0; idx < io->io_size; idx++)
58 release_region(addr + idx * io->regspacing,
59 io->regsize);
60 }
61}
62
63int ipmi_si_port_setup(struct si_sm_io *io)
64{
65 unsigned int addr = io->addr_data;
66 int idx;
67
68 if (!addr)
69 return -ENODEV;
70
71 /*
72 * Figure out the actual inb/inw/inl/etc routine to use based
73 * upon the register size.
74 */
75 switch (io->regsize) {
76 case 1:
77 io->inputb = port_inb;
78 io->outputb = port_outb;
79 break;
80 case 2:
81 io->inputb = port_inw;
82 io->outputb = port_outw;
83 break;
84 case 4:
85 io->inputb = port_inl;
86 io->outputb = port_outl;
87 break;
88 default:
89 dev_warn(io->dev, "Invalid register size: %d\n",
90 io->regsize);
91 return -EINVAL;
92 }
93
94 /*
95 * Some BIOSes reserve disjoint I/O regions in their ACPI
96 * tables. This causes problems when trying to register the
97 * entire I/O region. Therefore we must register each I/O
98 * port separately.
99 */
100 for (idx = 0; idx < io->io_size; idx++) {
101 if (request_region(addr + idx * io->regspacing,
102 io->regsize, SI_DEVICE_NAME) == NULL) {
103 /* Undo allocations */
104 while (idx--)
105 release_region(addr + idx * io->regspacing,
106 io->regsize);
107 return -EIO;
108 }
109 }
110
111 io->io_cleanup = port_cleanup;
112
113 return 0;
114}
115

source code of linux/drivers/char/ipmi/ipmi_si_port_io.c