]> git.proxmox.com Git - qemu.git/blame - hw/pm_smbus.c
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[qemu.git] / hw / pm_smbus.c
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1/*
2 * PC SMBus implementation
3 * splitted from acpi.c
4 *
5 * Copyright (c) 2006 Fabrice Bellard
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License version 2 as published by the Free Software Foundation.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
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17 * License along with this library; if not, see
18 * <http://www.gnu.org/licenses/>.
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19 */
20#include "hw.h"
21#include "pc.h"
22#include "pm_smbus.h"
fc0bdd99 23#include "smbus.h"
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24
25/* no save/load? */
26
27#define SMBHSTSTS 0x00
28#define SMBHSTCNT 0x02
29#define SMBHSTCMD 0x03
30#define SMBHSTADD 0x04
31#define SMBHSTDAT0 0x05
32#define SMBHSTDAT1 0x06
33#define SMBBLKDAT 0x07
34
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35//#define DEBUG
36
37#ifdef DEBUG
38# define SMBUS_DPRINTF(format, ...) printf(format, ## __VA_ARGS__)
39#else
40# define SMBUS_DPRINTF(format, ...) do { } while (0)
41#endif
42
43
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44static void smb_transaction(PMSMBus *s)
45{
46 uint8_t prot = (s->smb_ctl >> 2) & 0x07;
47 uint8_t read = s->smb_addr & 0x01;
48 uint8_t cmd = s->smb_cmd;
49 uint8_t addr = s->smb_addr >> 1;
50 i2c_bus *bus = s->smbus;
51
b246eebb 52 SMBUS_DPRINTF("SMBus trans addr=0x%02x prot=0x%02x\n", addr, prot);
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53 switch(prot) {
54 case 0x0:
55 smbus_quick_command(bus, addr, read);
56 break;
57 case 0x1:
58 if (read) {
59 s->smb_data0 = smbus_receive_byte(bus, addr);
60 } else {
61 smbus_send_byte(bus, addr, cmd);
62 }
63 break;
64 case 0x2:
65 if (read) {
66 s->smb_data0 = smbus_read_byte(bus, addr, cmd);
67 } else {
68 smbus_write_byte(bus, addr, cmd, s->smb_data0);
69 }
70 break;
71 case 0x3:
72 if (read) {
73 uint16_t val;
74 val = smbus_read_word(bus, addr, cmd);
75 s->smb_data0 = val;
76 s->smb_data1 = val >> 8;
77 } else {
78 smbus_write_word(bus, addr, cmd, (s->smb_data1 << 8) | s->smb_data0);
79 }
80 break;
81 case 0x5:
82 if (read) {
83 s->smb_data0 = smbus_read_block(bus, addr, cmd, s->smb_data);
84 } else {
85 smbus_write_block(bus, addr, cmd, s->smb_data, s->smb_data0);
86 }
87 break;
88 default:
89 goto error;
90 }
91 return;
92
93 error:
94 s->smb_stat |= 0x04;
95}
96
97void smb_ioport_writeb(void *opaque, uint32_t addr, uint32_t val)
98{
99 PMSMBus *s = opaque;
100 addr &= 0x3f;
b246eebb 101 SMBUS_DPRINTF("SMB writeb port=0x%04x val=0x%02x\n", addr, val);
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102 switch(addr) {
103 case SMBHSTSTS:
104 s->smb_stat = 0;
105 s->smb_index = 0;
106 break;
107 case SMBHSTCNT:
108 s->smb_ctl = val;
109 if (val & 0x40)
110 smb_transaction(s);
111 break;
112 case SMBHSTCMD:
113 s->smb_cmd = val;
114 break;
115 case SMBHSTADD:
116 s->smb_addr = val;
117 break;
118 case SMBHSTDAT0:
119 s->smb_data0 = val;
120 break;
121 case SMBHSTDAT1:
122 s->smb_data1 = val;
123 break;
124 case SMBBLKDAT:
125 s->smb_data[s->smb_index++] = val;
126 if (s->smb_index > 31)
127 s->smb_index = 0;
128 break;
129 default:
130 break;
131 }
132}
133
134uint32_t smb_ioport_readb(void *opaque, uint32_t addr)
135{
136 PMSMBus *s = opaque;
137 uint32_t val;
138
139 addr &= 0x3f;
140 switch(addr) {
141 case SMBHSTSTS:
142 val = s->smb_stat;
143 break;
144 case SMBHSTCNT:
145 s->smb_index = 0;
146 val = s->smb_ctl & 0x1f;
147 break;
148 case SMBHSTCMD:
149 val = s->smb_cmd;
150 break;
151 case SMBHSTADD:
152 val = s->smb_addr;
153 break;
154 case SMBHSTDAT0:
155 val = s->smb_data0;
156 break;
157 case SMBHSTDAT1:
158 val = s->smb_data1;
159 break;
160 case SMBBLKDAT:
161 val = s->smb_data[s->smb_index++];
162 if (s->smb_index > 31)
163 s->smb_index = 0;
164 break;
165 default:
166 val = 0;
167 break;
168 }
b246eebb 169 SMBUS_DPRINTF("SMB readb port=0x%04x val=0x%02x\n", addr, val);
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170 return val;
171}
172
173void pm_smbus_init(DeviceState *parent, PMSMBus *smb)
174{
175 smb->smbus = i2c_init_bus(parent, "i2c");
176}