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25#include "qemu/osdep.h"
26#include "qemu/units.h"
27#include "qapi/error.h"
28#include "hw/hw.h"
29#include "hw/boards.h"
30#include "hw/i2c/i2c.h"
31#include "hw/i2c/smbus_slave.h"
32#include "hw/i2c/smbus_eeprom.h"
33
34
35
36#define TYPE_SMBUS_EEPROM "smbus-eeprom"
37
38#define SMBUS_EEPROM(obj) \
39 OBJECT_CHECK(SMBusEEPROMDevice, (obj), TYPE_SMBUS_EEPROM)
40
41#define SMBUS_EEPROM_SIZE 256
42
43typedef struct SMBusEEPROMDevice {
44 SMBusDevice smbusdev;
45 uint8_t data[SMBUS_EEPROM_SIZE];
46 void *init_data;
47 uint8_t offset;
48 bool accessed;
49} SMBusEEPROMDevice;
50
51static uint8_t eeprom_receive_byte(SMBusDevice *dev)
52{
53 SMBusEEPROMDevice *eeprom = SMBUS_EEPROM(dev);
54 uint8_t *data = eeprom->data;
55 uint8_t val = data[eeprom->offset++];
56
57 eeprom->accessed = true;
58#ifdef DEBUG
59 printf("eeprom_receive_byte: addr=0x%02x val=0x%02x\n",
60 dev->i2c.address, val);
61#endif
62 return val;
63}
64
65static int eeprom_write_data(SMBusDevice *dev, uint8_t *buf, uint8_t len)
66{
67 SMBusEEPROMDevice *eeprom = SMBUS_EEPROM(dev);
68 uint8_t *data = eeprom->data;
69
70 eeprom->accessed = true;
71#ifdef DEBUG
72 printf("eeprom_write_byte: addr=0x%02x cmd=0x%02x val=0x%02x\n",
73 dev->i2c.address, buf[0], buf[1]);
74#endif
75
76 eeprom->offset = buf[0];
77 buf++;
78 len--;
79
80 for (; len > 0; len--) {
81 data[eeprom->offset] = *buf++;
82 eeprom->offset = (eeprom->offset + 1) % SMBUS_EEPROM_SIZE;
83 }
84
85 return 0;
86}
87
88static bool smbus_eeprom_vmstate_needed(void *opaque)
89{
90 MachineClass *mc = MACHINE_GET_CLASS(qdev_get_machine());
91 SMBusEEPROMDevice *eeprom = opaque;
92
93 return (eeprom->accessed || smbus_vmstate_needed(&eeprom->smbusdev)) &&
94 !mc->smbus_no_migration_support;
95}
96
97static const VMStateDescription vmstate_smbus_eeprom = {
98 .name = "smbus-eeprom",
99 .version_id = 1,
100 .minimum_version_id = 1,
101 .needed = smbus_eeprom_vmstate_needed,
102 .fields = (VMStateField[]) {
103 VMSTATE_SMBUS_DEVICE(smbusdev, SMBusEEPROMDevice),
104 VMSTATE_UINT8_ARRAY(data, SMBusEEPROMDevice, SMBUS_EEPROM_SIZE),
105 VMSTATE_UINT8(offset, SMBusEEPROMDevice),
106 VMSTATE_BOOL(accessed, SMBusEEPROMDevice),
107 VMSTATE_END_OF_LIST()
108 }
109};
110
111
112
113
114
115
116
117
118
119
120
121static void smbus_eeprom_reset(DeviceState *dev)
122{
123 SMBusEEPROMDevice *eeprom = SMBUS_EEPROM(dev);
124
125 memcpy(eeprom->data, eeprom->init_data, SMBUS_EEPROM_SIZE);
126 eeprom->offset = 0;
127}
128
129static void smbus_eeprom_realize(DeviceState *dev, Error **errp)
130{
131 smbus_eeprom_reset(dev);
132}
133
134static Property smbus_eeprom_properties[] = {
135 DEFINE_PROP_PTR("data", SMBusEEPROMDevice, init_data),
136 DEFINE_PROP_END_OF_LIST(),
137};
138
139static void smbus_eeprom_class_initfn(ObjectClass *klass, void *data)
140{
141 DeviceClass *dc = DEVICE_CLASS(klass);
142 SMBusDeviceClass *sc = SMBUS_DEVICE_CLASS(klass);
143
144 dc->realize = smbus_eeprom_realize;
145 dc->reset = smbus_eeprom_reset;
146 sc->receive_byte = eeprom_receive_byte;
147 sc->write_data = eeprom_write_data;
148 dc->props = smbus_eeprom_properties;
149 dc->vmsd = &vmstate_smbus_eeprom;
150
151 dc->user_creatable = false;
152}
153
154static const TypeInfo smbus_eeprom_info = {
155 .name = TYPE_SMBUS_EEPROM,
156 .parent = TYPE_SMBUS_DEVICE,
157 .instance_size = sizeof(SMBusEEPROMDevice),
158 .class_init = smbus_eeprom_class_initfn,
159};
160
161static void smbus_eeprom_register_types(void)
162{
163 type_register_static(&smbus_eeprom_info);
164}
165
166type_init(smbus_eeprom_register_types)
167
168void smbus_eeprom_init_one(I2CBus *smbus, uint8_t address, uint8_t *eeprom_buf)
169{
170 DeviceState *dev;
171
172 dev = qdev_create((BusState *) smbus, TYPE_SMBUS_EEPROM);
173 qdev_prop_set_uint8(dev, "address", address);
174 qdev_prop_set_ptr(dev, "data", eeprom_buf);
175 qdev_init_nofail(dev);
176}
177
178void smbus_eeprom_init(I2CBus *smbus, int nb_eeprom,
179 const uint8_t *eeprom_spd, int eeprom_spd_size)
180{
181 int i;
182
183
184 assert(nb_eeprom <= 8);
185 uint8_t *eeprom_buf = g_malloc0(8 * SMBUS_EEPROM_SIZE);
186 if (eeprom_spd_size > 0) {
187 memcpy(eeprom_buf, eeprom_spd, eeprom_spd_size);
188 }
189
190 for (i = 0; i < nb_eeprom; i++) {
191 smbus_eeprom_init_one(smbus, 0x50 + i,
192 eeprom_buf + (i * SMBUS_EEPROM_SIZE));
193 }
194}
195
196
197uint8_t *spd_data_generate(enum sdram_type type, ram_addr_t ram_size,
198 Error **errp)
199{
200 uint8_t *spd;
201 uint8_t nbanks;
202 uint16_t density;
203 uint32_t size;
204 int min_log2, max_log2, sz_log2;
205 int i;
206
207 switch (type) {
208 case SDR:
209 min_log2 = 2;
210 max_log2 = 9;
211 break;
212 case DDR:
213 min_log2 = 5;
214 max_log2 = 12;
215 break;
216 case DDR2:
217 min_log2 = 7;
218 max_log2 = 14;
219 break;
220 default:
221 g_assert_not_reached();
222 }
223 size = ram_size >> 20;
224 if (size < 4) {
225 error_setg(errp, "SDRAM size is too small");
226 return NULL;
227 }
228 sz_log2 = 31 - clz32(size);
229 size = 1U << sz_log2;
230 if (ram_size > size * MiB) {
231 error_setg(errp, "SDRAM size 0x"RAM_ADDR_FMT" is not a power of 2, "
232 "truncating to %u MB", ram_size, size);
233 }
234 if (sz_log2 < min_log2) {
235 error_setg(errp,
236 "Memory size is too small for SDRAM type, adjusting type");
237 if (size >= 32) {
238 type = DDR;
239 min_log2 = 5;
240 max_log2 = 12;
241 } else {
242 type = SDR;
243 min_log2 = 2;
244 max_log2 = 9;
245 }
246 }
247
248 nbanks = 1;
249 while (sz_log2 > max_log2 && nbanks < 8) {
250 sz_log2--;
251 nbanks++;
252 }
253
254 if (size > (1ULL << sz_log2) * nbanks) {
255 error_setg(errp, "Memory size is too big for SDRAM, truncating");
256 }
257
258
259 if (nbanks == 1 && sz_log2 > min_log2) {
260 sz_log2--;
261 nbanks++;
262 }
263
264 density = 1ULL << (sz_log2 - 2);
265 switch (type) {
266 case DDR2:
267 density = (density & 0xe0) | (density >> 8 & 0x1f);
268 break;
269 case DDR:
270 density = (density & 0xf8) | (density >> 8 & 0x07);
271 break;
272 case SDR:
273 default:
274 density &= 0xff;
275 break;
276 }
277
278 spd = g_malloc0(256);
279 spd[0] = 128;
280 spd[1] = 8;
281 spd[2] = type;
282 spd[3] = 13;
283 spd[4] = 10;
284 spd[5] = (type == DDR2 ? nbanks - 1 : nbanks);
285 spd[6] = 64;
286
287 spd[8] = 4;
288 spd[9] = 0x25;
289 spd[10] = 1;
290
291 spd[12] = 0x82;
292 spd[13] = 8;
293
294 spd[15] = (type == DDR2 ? 0 : 1);
295 spd[16] = 12;
296 spd[17] = 4;
297 spd[18] = 12;
298 spd[19] = (type == DDR2 ? 0 : 1);
299 spd[20] = 2;
300
301
302 spd[23] = 0x12;
303
304
305
306 spd[27] = 20;
307 spd[28] = 15;
308 spd[29] = 20;
309 spd[30] = 45;
310 spd[31] = density;
311 spd[32] = 20;
312 spd[33] = 8;
313 spd[34] = 20;
314 spd[35] = 8;
315
316
317 for (i = 0; i < 63; i++) {
318 spd[63] += spd[i];
319 }
320 return spd;
321}
322