1 // SPDX-License-Identifier: GPL-2.0+
2
3 #include <linux/io.h>
4 #include "ipmi_si.h"
5
port_inb(const struct si_sm_io * io,unsigned int offset)6 static 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(addr + (offset * io->regspacing));
11 }
12
port_outb(const struct si_sm_io * io,unsigned int offset,unsigned char b)13 static 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(b, addr + (offset * io->regspacing));
19 }
20
port_inw(const struct si_sm_io * io,unsigned int offset)21 static 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(addr + (offset * io->regspacing)) >> io->regshift) & 0xff;
26 }
27
port_outw(const struct si_sm_io * io,unsigned int offset,unsigned char b)28 static 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(b << io->regshift, addr + (offset * io->regspacing));
34 }
35
port_inl(const struct si_sm_io * io,unsigned int offset)36 static 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(addr + (offset * io->regspacing)) >> io->regshift) & 0xff;
41 }
42
port_outl(const struct si_sm_io * io,unsigned int offset,unsigned char b)43 static 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(b << io->regshift, addr+(offset * io->regspacing));
49 }
50
port_cleanup(struct si_sm_io * io)51 static 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
ipmi_si_port_setup(struct si_sm_io * io)63 int 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