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(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(b, 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(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(b << io->regshift, 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(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(b << io->regshift, 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