xref: /illumos-kvm-cmd/hw/pm_smbus.c (revision 68396ea9)
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
17  * License along with this library; if not, see
18  * <http://www.gnu.org/licenses/>.
19  */
20 #include "hw.h"
21 #include "pc.h"
22 #include "pm_smbus.h"
23 #include "smbus.h"
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 
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 
smb_transaction(PMSMBus * s)44 static 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 
52     SMBUS_DPRINTF("SMBus trans addr=0x%02x prot=0x%02x\n", addr, prot);
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 
smb_ioport_writeb(void * opaque,uint32_t addr,uint32_t val)97 void smb_ioport_writeb(void *opaque, uint32_t addr, uint32_t val)
98 {
99     PMSMBus *s = opaque;
100     addr &= 0x3f;
101     SMBUS_DPRINTF("SMB writeb port=0x%04x val=0x%02x\n", addr, val);
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 
smb_ioport_readb(void * opaque,uint32_t addr)134 uint32_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     }
169     SMBUS_DPRINTF("SMB readb port=0x%04x val=0x%02x\n", addr, val);
170     return val;
171 }
172 
pm_smbus_init(DeviceState * parent,PMSMBus * smb)173 void pm_smbus_init(DeviceState *parent, PMSMBus *smb)
174 {
175     smb->smbus = i2c_init_bus(parent, "i2c");
176 }
177