1 // SPDX-License-Identifier: GPL-2.0+
2 
3 #include <linux/io.h>
4 #include "ipmi_si.h"
5 
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 
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 
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 
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 
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 
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 
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 
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 	io->io_cleanup = port_cleanup;
72 
73 	/*
74 	 * Figure out the actual inb/inw/inl/etc routine to use based
75 	 * upon the register size.
76 	 */
77 	switch (io->regsize) {
78 	case 1:
79 		io->inputb = port_inb;
80 		io->outputb = port_outb;
81 		break;
82 	case 2:
83 		io->inputb = port_inw;
84 		io->outputb = port_outw;
85 		break;
86 	case 4:
87 		io->inputb = port_inl;
88 		io->outputb = port_outl;
89 		break;
90 	default:
91 		dev_warn(io->dev, "Invalid register size: %d\n",
92 			 io->regsize);
93 		return -EINVAL;
94 	}
95 
96 	/*
97 	 * Some BIOSes reserve disjoint I/O regions in their ACPI
98 	 * tables.  This causes problems when trying to register the
99 	 * entire I/O region.  Therefore we must register each I/O
100 	 * port separately.
101 	 */
102 	for (idx = 0; idx < io->io_size; idx++) {
103 		if (request_region(addr + idx * io->regspacing,
104 				   io->regsize, DEVICE_NAME) == NULL) {
105 			/* Undo allocations */
106 			while (idx--)
107 				release_region(addr + idx * io->regspacing,
108 					       io->regsize);
109 			return -EIO;
110 		}
111 	}
112 	return 0;
113 }
114