sm501: Add missing arbitration control register
[qemu.git] / hw / i2c / smbus_eeprom.c
1 /*
2 * QEMU SMBus EEPROM device
3 *
4 * Copyright (c) 2007 Arastra, Inc.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24
25 #include "qemu/osdep.h"
26 #include "hw/hw.h"
27 #include "hw/i2c/i2c.h"
28 #include "hw/i2c/smbus.h"
29
30 //#define DEBUG
31
32 typedef struct SMBusEEPROMDevice {
33 SMBusDevice smbusdev;
34 void *data;
35 uint8_t offset;
36 } SMBusEEPROMDevice;
37
38 static void eeprom_quick_cmd(SMBusDevice *dev, uint8_t read)
39 {
40 #ifdef DEBUG
41 printf("eeprom_quick_cmd: addr=0x%02x read=%d\n", dev->i2c.address, read);
42 #endif
43 }
44
45 static void eeprom_send_byte(SMBusDevice *dev, uint8_t val)
46 {
47 SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev;
48 #ifdef DEBUG
49 printf("eeprom_send_byte: addr=0x%02x val=0x%02x\n",
50 dev->i2c.address, val);
51 #endif
52 eeprom->offset = val;
53 }
54
55 static uint8_t eeprom_receive_byte(SMBusDevice *dev)
56 {
57 SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev;
58 uint8_t *data = eeprom->data;
59 uint8_t val = data[eeprom->offset++];
60 #ifdef DEBUG
61 printf("eeprom_receive_byte: addr=0x%02x val=0x%02x\n",
62 dev->i2c.address, val);
63 #endif
64 return val;
65 }
66
67 static void eeprom_write_data(SMBusDevice *dev, uint8_t cmd, uint8_t *buf, int len)
68 {
69 SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev;
70 int n;
71 #ifdef DEBUG
72 printf("eeprom_write_byte: addr=0x%02x cmd=0x%02x val=0x%02x\n",
73 dev->i2c.address, cmd, buf[0]);
74 #endif
75 /* A page write operation is not a valid SMBus command.
76 It is a block write without a length byte. Fortunately we
77 get the full block anyway. */
78 /* TODO: Should this set the current location? */
79 if (cmd + len > 256)
80 n = 256 - cmd;
81 else
82 n = len;
83 memcpy(eeprom->data + cmd, buf, n);
84 len -= n;
85 if (len)
86 memcpy(eeprom->data, buf + n, len);
87 }
88
89 static uint8_t eeprom_read_data(SMBusDevice *dev, uint8_t cmd, int n)
90 {
91 SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev;
92 /* If this is the first byte then set the current position. */
93 if (n == 0)
94 eeprom->offset = cmd;
95 /* As with writes, we implement block reads without the
96 SMBus length byte. */
97 return eeprom_receive_byte(dev);
98 }
99
100 static int smbus_eeprom_initfn(SMBusDevice *dev)
101 {
102 SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *)dev;
103
104 eeprom->offset = 0;
105 return 0;
106 }
107
108 static Property smbus_eeprom_properties[] = {
109 DEFINE_PROP_PTR("data", SMBusEEPROMDevice, data),
110 DEFINE_PROP_END_OF_LIST(),
111 };
112
113 static void smbus_eeprom_class_initfn(ObjectClass *klass, void *data)
114 {
115 DeviceClass *dc = DEVICE_CLASS(klass);
116 SMBusDeviceClass *sc = SMBUS_DEVICE_CLASS(klass);
117
118 sc->init = smbus_eeprom_initfn;
119 sc->quick_cmd = eeprom_quick_cmd;
120 sc->send_byte = eeprom_send_byte;
121 sc->receive_byte = eeprom_receive_byte;
122 sc->write_data = eeprom_write_data;
123 sc->read_data = eeprom_read_data;
124 dc->props = smbus_eeprom_properties;
125 /* Reason: pointer property "data" */
126 dc->cannot_instantiate_with_device_add_yet = true;
127 }
128
129 static const TypeInfo smbus_eeprom_info = {
130 .name = "smbus-eeprom",
131 .parent = TYPE_SMBUS_DEVICE,
132 .instance_size = sizeof(SMBusEEPROMDevice),
133 .class_init = smbus_eeprom_class_initfn,
134 };
135
136 static void smbus_eeprom_register_types(void)
137 {
138 type_register_static(&smbus_eeprom_info);
139 }
140
141 type_init(smbus_eeprom_register_types)
142
143 void smbus_eeprom_init(I2CBus *smbus, int nb_eeprom,
144 const uint8_t *eeprom_spd, int eeprom_spd_size)
145 {
146 int i;
147 uint8_t *eeprom_buf = g_malloc0(8 * 256); /* XXX: make this persistent */
148 if (eeprom_spd_size > 0) {
149 memcpy(eeprom_buf, eeprom_spd, eeprom_spd_size);
150 }
151
152 for (i = 0; i < nb_eeprom; i++) {
153 DeviceState *eeprom;
154 eeprom = qdev_create((BusState *)smbus, "smbus-eeprom");
155 qdev_prop_set_uint8(eeprom, "address", 0x50 + i);
156 qdev_prop_set_ptr(eeprom, "data", eeprom_buf + (i * 256));
157 qdev_init_nofail(eeprom);
158 }
159 }