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aspeed/i2c: QOMify AspeedI2CBus
[mirror_qemu.git] / hw / i2c / aspeed_i2c.c
CommitLineData
16020011
CLG		 1/*
2 * ARM Aspeed I2C controller
3 *
4 * Copyright (C) 2016 IBM Corp.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 2
9 * of the License, or (at your option) any later version.
10 *
11 * This program 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
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, see <http://www.gnu.org/licenses/>.
18 *
19 */
20
21#include "qemu/osdep.h"
22#include "hw/sysbus.h"
d6454270 23#include "migration/vmstate.h"
16020011 24#include "qemu/log.h"
0b8fa32f 25#include "qemu/module.h"
545d6bef
CLG		 26#include "qemu/error-report.h"
27#include "qapi/error.h"
16020011 28#include "hw/i2c/aspeed_i2c.h"
64552b6b 29#include "hw/irq.h"
545d6bef 30#include "hw/qdev-properties.h"
66cc84a1 31#include "trace.h"
16020011
CLG		 32
33/* I2C Global Register */
34
35#define I2C_CTRL_STATUS 0x00 /* Device Interrupt Status */
36#define I2C_CTRL_ASSIGN 0x08 /* Device Interrupt Target
37 Assignment */
aab90b1c
CLG		 38#define I2C_CTRL_GLOBAL 0x0C /* Global Control Register */
39#define I2C_CTRL_SRAM_EN BIT(0)
16020011
CLG		 40
41/* I2C Device (Bus) Register */
42
43#define I2CD_FUN_CTRL_REG 0x00 /* I2CD Function Control */
6054fc73 44#define I2CD_POOL_PAGE_SEL(x) (((x) >> 20) & 0x7) /* AST2400 */
16020011
CLG		 45#define I2CD_M_SDA_LOCK_EN (0x1 << 16)
46#define I2CD_MULTI_MASTER_DIS (0x1 << 15)
47#define I2CD_M_SCL_DRIVE_EN (0x1 << 14)
48#define I2CD_MSB_STS (0x1 << 9)
49#define I2CD_SDA_DRIVE_1T_EN (0x1 << 8)
50#define I2CD_M_SDA_DRIVE_1T_EN (0x1 << 7)
51#define I2CD_M_HIGH_SPEED_EN (0x1 << 6)
52#define I2CD_DEF_ADDR_EN (0x1 << 5)
53#define I2CD_DEF_ALERT_EN (0x1 << 4)
54#define I2CD_DEF_ARP_EN (0x1 << 3)
55#define I2CD_DEF_GCALL_EN (0x1 << 2)
56#define I2CD_SLAVE_EN (0x1 << 1)
57#define I2CD_MASTER_EN (0x1)
58
59#define I2CD_AC_TIMING_REG1 0x04 /* Clock and AC Timing Control #1 */
60#define I2CD_AC_TIMING_REG2 0x08 /* Clock and AC Timing Control #1 */
61#define I2CD_INTR_CTRL_REG 0x0c /* I2CD Interrupt Control */
62#define I2CD_INTR_STS_REG 0x10 /* I2CD Interrupt Status */
5540cb97
CLG		 63
64#define I2CD_INTR_SLAVE_ADDR_MATCH (0x1 << 31) /* 0: addr1 1: addr2 */
65#define I2CD_INTR_SLAVE_ADDR_RX_PENDING (0x1 << 30)
66/* bits[19-16] Reserved */
67
68/* All bits below are cleared by writing 1 */
69#define I2CD_INTR_SLAVE_INACTIVE_TIMEOUT (0x1 << 15)
16020011
CLG		 70#define I2CD_INTR_SDA_DL_TIMEOUT (0x1 << 14)
71#define I2CD_INTR_BUS_RECOVER_DONE (0x1 << 13)
72#define I2CD_INTR_SMBUS_ALERT (0x1 << 12) /* Bus [0-3] only */
73#define I2CD_INTR_SMBUS_ARP_ADDR (0x1 << 11) /* Removed */
74#define I2CD_INTR_SMBUS_DEV_ALERT_ADDR (0x1 << 10) /* Removed */
75#define I2CD_INTR_SMBUS_DEF_ADDR (0x1 << 9) /* Removed */
76#define I2CD_INTR_GCALL_ADDR (0x1 << 8) /* Removed */
5540cb97 77#define I2CD_INTR_SLAVE_ADDR_RX_MATCH (0x1 << 7) /* use RX_DONE */
16020011
CLG		 78#define I2CD_INTR_SCL_TIMEOUT (0x1 << 6)
79#define I2CD_INTR_ABNORMAL (0x1 << 5)
80#define I2CD_INTR_NORMAL_STOP (0x1 << 4)
81#define I2CD_INTR_ARBIT_LOSS (0x1 << 3)
82#define I2CD_INTR_RX_DONE (0x1 << 2)
83#define I2CD_INTR_TX_NAK (0x1 << 1)
84#define I2CD_INTR_TX_ACK (0x1 << 0)
85
86#define I2CD_CMD_REG 0x14 /* I2CD Command/Status */
87#define I2CD_SDA_OE (0x1 << 28)
88#define I2CD_SDA_O (0x1 << 27)
89#define I2CD_SCL_OE (0x1 << 26)
90#define I2CD_SCL_O (0x1 << 25)
91#define I2CD_TX_TIMING (0x1 << 24)
92#define I2CD_TX_STATUS (0x1 << 23)
93
94#define I2CD_TX_STATE_SHIFT 19 /* Tx State Machine */
95#define I2CD_TX_STATE_MASK 0xf
96#define I2CD_IDLE 0x0
97#define I2CD_MACTIVE 0x8
98#define I2CD_MSTART 0x9
99#define I2CD_MSTARTR 0xa
100#define I2CD_MSTOP 0xb
101#define I2CD_MTXD 0xc
102#define I2CD_MRXACK 0xd
103#define I2CD_MRXD 0xe
104#define I2CD_MTXACK 0xf
105#define I2CD_SWAIT 0x1
106#define I2CD_SRXD 0x4
107#define I2CD_STXACK 0x5
108#define I2CD_STXD 0x6
109#define I2CD_SRXACK 0x7
110#define I2CD_RECOVER 0x3
111
112#define I2CD_SCL_LINE_STS (0x1 << 18)
113#define I2CD_SDA_LINE_STS (0x1 << 17)
114#define I2CD_BUS_BUSY_STS (0x1 << 16)
115#define I2CD_SDA_OE_OUT_DIR (0x1 << 15)
116#define I2CD_SDA_O_OUT_DIR (0x1 << 14)
117#define I2CD_SCL_OE_OUT_DIR (0x1 << 13)
118#define I2CD_SCL_O_OUT_DIR (0x1 << 12)
119#define I2CD_BUS_RECOVER_CMD_EN (0x1 << 11)
120#define I2CD_S_ALT_EN (0x1 << 10)
16020011
CLG		 121
122/* Command Bit */
6054fc73
CLG		 123#define I2CD_RX_DMA_ENABLE (0x1 << 9)
124#define I2CD_TX_DMA_ENABLE (0x1 << 8)
125#define I2CD_RX_BUFF_ENABLE (0x1 << 7)
126#define I2CD_TX_BUFF_ENABLE (0x1 << 6)
16020011
CLG		 127#define I2CD_M_STOP_CMD (0x1 << 5)
128#define I2CD_M_S_RX_CMD_LAST (0x1 << 4)
129#define I2CD_M_RX_CMD (0x1 << 3)
130#define I2CD_S_TX_CMD (0x1 << 2)
131#define I2CD_M_TX_CMD (0x1 << 1)
132#define I2CD_M_START_CMD (0x1)
133
134#define I2CD_DEV_ADDR_REG 0x18 /* Slave Device Address */
6054fc73
CLG		 135#define I2CD_POOL_CTRL_REG 0x1c /* Pool Buffer Control */
136#define I2CD_POOL_RX_COUNT(x) (((x) >> 24) & 0xff)
137#define I2CD_POOL_RX_SIZE(x) ((((x) >> 16) & 0xff) + 1)
138#define I2CD_POOL_TX_COUNT(x) ((((x) >> 8) & 0xff) + 1)
139#define I2CD_POOL_OFFSET(x) (((x) & 0x3f) << 2) /* AST2400 */
16020011
CLG		 140#define I2CD_BYTE_BUF_REG 0x20 /* Transmit/Receive Byte Buffer */
141#define I2CD_BYTE_BUF_TX_SHIFT 0
142#define I2CD_BYTE_BUF_TX_MASK 0xff
143#define I2CD_BYTE_BUF_RX_SHIFT 8
144#define I2CD_BYTE_BUF_RX_MASK 0xff
545d6bef
CLG		 145#define I2CD_DMA_ADDR 0x24 /* DMA Buffer Address */
146#define I2CD_DMA_LEN 0x28 /* DMA Transfer Length < 4KB */
16020011
CLG		 147
148static inline bool aspeed_i2c_bus_is_master(AspeedI2CBus *bus)
149{
150 return bus->ctrl & I2CD_MASTER_EN;
151}
152
153static inline bool aspeed_i2c_bus_is_enabled(AspeedI2CBus *bus)
154{
155 return bus->ctrl & (I2CD_MASTER_EN | I2CD_SLAVE_EN);
156}
157
158static inline void aspeed_i2c_bus_raise_interrupt(AspeedI2CBus *bus)
159{
51dd4923
CLG		 160 AspeedI2CClass *aic = ASPEED_I2C_GET_CLASS(bus->controller);
161
66cc84a1
CLG		 162 trace_aspeed_i2c_bus_raise_interrupt(bus->intr_status,
163 bus->intr_status & I2CD_INTR_TX_NAK ? "nak|" : "",
164 bus->intr_status & I2CD_INTR_TX_ACK ? "ack|" : "",
165 bus->intr_status & I2CD_INTR_RX_DONE ? "done|" : "",
166 bus->intr_status & I2CD_INTR_NORMAL_STOP ? "normal|" : "",
167 bus->intr_status & I2CD_INTR_ABNORMAL ? "abnormal" : "");
168
16020011
CLG		 169 bus->intr_status &= bus->intr_ctrl;
170 if (bus->intr_status) {
171 bus->controller->intr_status |= 1 << bus->id;
51dd4923 172 qemu_irq_raise(aic->bus_get_irq(bus));
16020011
CLG		 173 }
174}
175
176static uint64_t aspeed_i2c_bus_read(void *opaque, hwaddr offset,
177 unsigned size)
178{
179 AspeedI2CBus *bus = opaque;
545d6bef 180 AspeedI2CClass *aic = ASPEED_I2C_GET_CLASS(bus->controller);
66cc84a1 181 uint64_t value = -1;
16020011
CLG		 182
183 switch (offset) {
184 case I2CD_FUN_CTRL_REG:
66cc84a1
CLG		 185 value = bus->ctrl;
186 break;
16020011 187 case I2CD_AC_TIMING_REG1:
66cc84a1
CLG		 188 value = bus->timing[0];
189 break;
16020011 190 case I2CD_AC_TIMING_REG2:
66cc84a1
CLG		 191 value = bus->timing[1];
192 break;
16020011 193 case I2CD_INTR_CTRL_REG:
66cc84a1
CLG		 194 value = bus->intr_ctrl;
195 break;
16020011 196 case I2CD_INTR_STS_REG:
66cc84a1
CLG		 197 value = bus->intr_status;
198 break;
6054fc73 199 case I2CD_POOL_CTRL_REG:
66cc84a1
CLG		 200 value = bus->pool_ctrl;
201 break;
16020011 202 case I2CD_BYTE_BUF_REG:
66cc84a1
CLG		 203 value = bus->buf;
204 break;
16020011 205 case I2CD_CMD_REG:
66cc84a1
CLG		 206 value = bus->cmd | (i2c_bus_busy(bus->bus) << 16);
207 break;
545d6bef
CLG		 208 case I2CD_DMA_ADDR:
209 if (!aic->has_dma) {
210 qemu_log_mask(LOG_GUEST_ERROR, "%s: No DMA support\n", __func__);
66cc84a1 211 break;
545d6bef 212 }
66cc84a1
CLG		 213 value = bus->dma_addr;
214 break;
545d6bef
CLG		 215 case I2CD_DMA_LEN:
216 if (!aic->has_dma) {
217 qemu_log_mask(LOG_GUEST_ERROR, "%s: No DMA support\n", __func__);
66cc84a1 218 break;
545d6bef 219 }
66cc84a1
CLG		 220 value = bus->dma_len;
221 break;
222
16020011
CLG		 223 default:
224 qemu_log_mask(LOG_GUEST_ERROR,
225 "%s: Bad offset 0x%" HWADDR_PRIx "\n", __func__, offset);
66cc84a1
CLG		 226 value = -1;
227 break;
16020011 228 }
66cc84a1
CLG		 229
230 trace_aspeed_i2c_bus_read(bus->id, offset, size, value);
231 return value;
16020011
CLG		 232}
233
4960f084
CLG		 234static void aspeed_i2c_set_state(AspeedI2CBus *bus, uint8_t state)
235{
236 bus->cmd &= ~(I2CD_TX_STATE_MASK << I2CD_TX_STATE_SHIFT);
237 bus->cmd |= (state & I2CD_TX_STATE_MASK) << I2CD_TX_STATE_SHIFT;
238}
239
240static uint8_t aspeed_i2c_get_state(AspeedI2CBus *bus)
241{
242 return (bus->cmd >> I2CD_TX_STATE_SHIFT) & I2CD_TX_STATE_MASK;
243}
244
545d6bef
CLG		 245static int aspeed_i2c_dma_read(AspeedI2CBus *bus, uint8_t *data)
246{
247 MemTxResult result;
248 AspeedI2CState *s = bus->controller;
249
250 result = address_space_read(&s->dram_as, bus->dma_addr,
251 MEMTXATTRS_UNSPECIFIED, data, 1);
252 if (result != MEMTX_OK) {
253 qemu_log_mask(LOG_GUEST_ERROR, "%s: DRAM read failed @%08x\n",
254 __func__, bus->dma_addr);
255 return -1;
256 }
257
258 bus->dma_addr++;
259 bus->dma_len--;
260 return 0;
261}
262
6054fc73
CLG		 263static int aspeed_i2c_bus_send(AspeedI2CBus *bus, uint8_t pool_start)
264{
265 AspeedI2CClass *aic = ASPEED_I2C_GET_CLASS(bus->controller);
266 int ret = -1;
267 int i;
268
269 if (bus->cmd & I2CD_TX_BUFF_ENABLE) {
270 for (i = pool_start; i < I2CD_POOL_TX_COUNT(bus->pool_ctrl); i++) {
271 uint8_t *pool_base = aic->bus_pool_base(bus);
272
66cc84a1
CLG		 273 trace_aspeed_i2c_bus_send("BUF", i + 1,
274 I2CD_POOL_TX_COUNT(bus->pool_ctrl),
275 pool_base[i]);
6054fc73
CLG		 276 ret = i2c_send(bus->bus, pool_base[i]);
277 if (ret) {
278 break;
279 }
280 }
281 bus->cmd &= ~I2CD_TX_BUFF_ENABLE;
545d6bef
CLG		 282 } else if (bus->cmd & I2CD_TX_DMA_ENABLE) {
283 while (bus->dma_len) {
284 uint8_t data;
285 aspeed_i2c_dma_read(bus, &data);
66cc84a1 286 trace_aspeed_i2c_bus_send("DMA", bus->dma_len, bus->dma_len, data);
545d6bef
CLG		 287 ret = i2c_send(bus->bus, data);
288 if (ret) {
289 break;
290 }
291 }
292 bus->cmd &= ~I2CD_TX_DMA_ENABLE;
6054fc73 293 } else {
66cc84a1 294 trace_aspeed_i2c_bus_send("BYTE", pool_start, 1, bus->buf);
6054fc73
CLG		 295 ret = i2c_send(bus->bus, bus->buf);
296 }
297
298 return ret;
299}
300
301static void aspeed_i2c_bus_recv(AspeedI2CBus *bus)
7bd9c60d 302{
6054fc73
CLG		 303 AspeedI2CState *s = bus->controller;
304 AspeedI2CClass *aic = ASPEED_I2C_GET_CLASS(s);
305 uint8_t data;
306 int i;
307
308 if (bus->cmd & I2CD_RX_BUFF_ENABLE) {
309 uint8_t *pool_base = aic->bus_pool_base(bus);
7bd9c60d 310
6054fc73
CLG		 311 for (i = 0; i < I2CD_POOL_RX_SIZE(bus->pool_ctrl); i++) {
312 pool_base[i] = i2c_recv(bus->bus);
66cc84a1
CLG		 313 trace_aspeed_i2c_bus_recv("BUF", i + 1,
314 I2CD_POOL_RX_SIZE(bus->pool_ctrl),
315 pool_base[i]);
6054fc73
CLG		 316 }
317
318 /* Update RX count */
319 bus->pool_ctrl &= ~(0xff << 24);
320 bus->pool_ctrl |= (i & 0xff) << 24;
321 bus->cmd &= ~I2CD_RX_BUFF_ENABLE;
545d6bef
CLG		 322 } else if (bus->cmd & I2CD_RX_DMA_ENABLE) {
323 uint8_t data;
324
325 while (bus->dma_len) {
326 MemTxResult result;
327
328 data = i2c_recv(bus->bus);
66cc84a1 329 trace_aspeed_i2c_bus_recv("DMA", bus->dma_len, bus->dma_len, data);
545d6bef
CLG		 330 result = address_space_write(&s->dram_as, bus->dma_addr,
331 MEMTXATTRS_UNSPECIFIED, &data, 1);
332 if (result != MEMTX_OK) {
333 qemu_log_mask(LOG_GUEST_ERROR, "%s: DRAM write failed @%08x\n",
334 __func__, bus->dma_addr);
335 return;
336 }
337 bus->dma_addr++;
338 bus->dma_len--;
339 }
340 bus->cmd &= ~I2CD_RX_DMA_ENABLE;
6054fc73
CLG		 341 } else {
342 data = i2c_recv(bus->bus);
66cc84a1 343 trace_aspeed_i2c_bus_recv("BYTE", 1, 1, bus->buf);
6054fc73
CLG		 344 bus->buf = (data & I2CD_BYTE_BUF_RX_MASK) << I2CD_BYTE_BUF_RX_SHIFT;
345 }
346}
347
348static void aspeed_i2c_handle_rx_cmd(AspeedI2CBus *bus)
349{
7bd9c60d 350 aspeed_i2c_set_state(bus, I2CD_MRXD);
6054fc73 351 aspeed_i2c_bus_recv(bus);
bc15cde0 352 bus->intr_status |= I2CD_INTR_RX_DONE;
7bd9c60d
GR		 353 if (bus->cmd & I2CD_M_S_RX_CMD_LAST) {
354 i2c_nack(bus->bus);
355 }
356 bus->cmd &= ~(I2CD_M_RX_CMD | I2CD_M_S_RX_CMD_LAST);
357 aspeed_i2c_set_state(bus, I2CD_MACTIVE);
358}
359
6054fc73
CLG		 360static uint8_t aspeed_i2c_get_addr(AspeedI2CBus *bus)
361{
362 AspeedI2CClass *aic = ASPEED_I2C_GET_CLASS(bus->controller);
363
364 if (bus->cmd & I2CD_TX_BUFF_ENABLE) {
365 uint8_t *pool_base = aic->bus_pool_base(bus);
366
367 return pool_base[0];
545d6bef
CLG		 368 } else if (bus->cmd & I2CD_TX_DMA_ENABLE) {
369 uint8_t data;
370
371 aspeed_i2c_dma_read(bus, &data);
372 return data;
6054fc73
CLG		 373 } else {
374 return bus->buf;
375 }
376}
377
aab90b1c
CLG		 378static bool aspeed_i2c_check_sram(AspeedI2CBus *bus)
379{
380 AspeedI2CState *s = bus->controller;
381 AspeedI2CClass *aic = ASPEED_I2C_GET_CLASS(s);
382
383 if (!aic->check_sram) {
384 return true;
385 }
386
387 /*
388 * AST2500: SRAM must be enabled before using the Buffer Pool or
389 * DMA mode.
390 */
391 if (!(s->ctrl_global & I2C_CTRL_SRAM_EN) &&
392 (bus->cmd & (I2CD_RX_DMA_ENABLE | I2CD_TX_DMA_ENABLE |
393 I2CD_RX_BUFF_ENABLE | I2CD_TX_BUFF_ENABLE))) {
394 qemu_log_mask(LOG_GUEST_ERROR, "%s: SRAM is not enabled\n", __func__);
395 return false;
396 }
397
398 return true;
399}
400
66cc84a1
CLG		 401static void aspeed_i2c_bus_cmd_dump(AspeedI2CBus *bus)
402{
f821bac4 403 g_autofree char *cmd_flags = NULL;
66cc84a1
CLG		 404 uint32_t count;
405
406 if (bus->cmd & (I2CD_RX_BUFF_ENABLE | I2CD_RX_BUFF_ENABLE)) {
407 count = I2CD_POOL_TX_COUNT(bus->pool_ctrl);
408 } else if (bus->cmd & (I2CD_RX_DMA_ENABLE | I2CD_RX_DMA_ENABLE)) {
409 count = bus->dma_len;
410 } else { /* BYTE mode */
411 count = 1;
412 }
413
414 cmd_flags = g_strdup_printf("%s%s%s%s%s%s%s%s%s",
415 bus->cmd & I2CD_M_START_CMD ? "start|" : "",
416 bus->cmd & I2CD_RX_DMA_ENABLE ? "rxdma|" : "",
417 bus->cmd & I2CD_TX_DMA_ENABLE ? "txdma|" : "",
418 bus->cmd & I2CD_RX_BUFF_ENABLE ? "rxbuf|" : "",
419 bus->cmd & I2CD_TX_BUFF_ENABLE ? "txbuf|" : "",
420 bus->cmd & I2CD_M_TX_CMD ? "tx|" : "",
421 bus->cmd & I2CD_M_RX_CMD ? "rx|" : "",
422 bus->cmd & I2CD_M_S_RX_CMD_LAST ? "last|" : "",
423 bus->cmd & I2CD_M_STOP_CMD ? "stop" : "");
424
425 trace_aspeed_i2c_bus_cmd(bus->cmd, cmd_flags, count, bus->intr_status);
426}
427
4960f084
CLG		 428/*
429 * The state machine needs some refinement. It is only used to track
430 * invalid STOP commands for the moment.
431 */
16020011
CLG		 432static void aspeed_i2c_bus_handle_cmd(AspeedI2CBus *bus, uint64_t value)
433{
6054fc73
CLG		 434 uint8_t pool_start = 0;
435
ddabca75 436 bus->cmd &= ~0xFFFF;
16020011 437 bus->cmd |= value & 0xFFFF;
16020011 438
aab90b1c
CLG		 439 if (!aspeed_i2c_check_sram(bus)) {
440 return;
441 }
442
66cc84a1
CLG		 443 if (trace_event_get_state_backends(TRACE_ASPEED_I2C_BUS_CMD)) {
444 aspeed_i2c_bus_cmd_dump(bus);
445 }
446
16020011 447 if (bus->cmd & I2CD_M_START_CMD) {
4960f084
CLG		 448 uint8_t state = aspeed_i2c_get_state(bus) & I2CD_MACTIVE ?
449 I2CD_MSTARTR : I2CD_MSTART;
6054fc73 450 uint8_t addr;
4960f084
CLG		 451
452 aspeed_i2c_set_state(bus, state);
453
6054fc73
CLG		 454 addr = aspeed_i2c_get_addr(bus);
455
456 if (i2c_start_transfer(bus->bus, extract32(addr, 1, 7),
457 extract32(addr, 0, 1))) {
16020011
CLG		 458 bus->intr_status |= I2CD_INTR_TX_NAK;
459 } else {
460 bus->intr_status |= I2CD_INTR_TX_ACK;
461 }
462
6054fc73
CLG		 463 bus->cmd &= ~I2CD_M_START_CMD;
464
465 /*
466 * The START command is also a TX command, as the slave
467 * address is sent on the bus. Drop the TX flag if nothing
468 * else needs to be sent in this sequence.
469 */
470 if (bus->cmd & I2CD_TX_BUFF_ENABLE) {
471 if (I2CD_POOL_TX_COUNT(bus->pool_ctrl) == 1) {
472 bus->cmd &= ~I2CD_M_TX_CMD;
473 } else {
474 /*
475 * Increase the start index in the TX pool buffer to
476 * skip the address byte.
477 */
478 pool_start++;
479 }
545d6bef
CLG		 480 } else if (bus->cmd & I2CD_TX_DMA_ENABLE) {
481 if (bus->dma_len == 0) {
482 bus->cmd &= ~I2CD_M_TX_CMD;
483 }
6054fc73
CLG		 484 } else {
485 bus->cmd &= ~I2CD_M_TX_CMD;
486 }
ddabca75
CLG		 487
488 /* No slave found */
489 if (!i2c_bus_busy(bus->bus)) {
490 return;
491 }
4960f084 492 aspeed_i2c_set_state(bus, I2CD_MACTIVE);
ddabca75
CLG		 493 }
494
495 if (bus->cmd & I2CD_M_TX_CMD) {
4960f084 496 aspeed_i2c_set_state(bus, I2CD_MTXD);
6054fc73 497 if (aspeed_i2c_bus_send(bus, pool_start)) {
4960f084 498 bus->intr_status |= (I2CD_INTR_TX_NAK);
16020011
CLG		 499 i2c_end_transfer(bus->bus);
500 } else {
501 bus->intr_status |= I2CD_INTR_TX_ACK;
502 }
ddabca75 503 bus->cmd &= ~I2CD_M_TX_CMD;
4960f084 504 aspeed_i2c_set_state(bus, I2CD_MACTIVE);
ddabca75 505 }
16020011 506
bb626e5b
GR		 507 if ((bus->cmd & (I2CD_M_RX_CMD | I2CD_M_S_RX_CMD_LAST)) &&
508 !(bus->intr_status & I2CD_INTR_RX_DONE)) {
7bd9c60d 509 aspeed_i2c_handle_rx_cmd(bus);
16020011
CLG		 510 }
511
d0efdc16 512 if (bus->cmd & I2CD_M_STOP_CMD) {
4960f084
CLG		 513 if (!(aspeed_i2c_get_state(bus) & I2CD_MACTIVE)) {
514 qemu_log_mask(LOG_GUEST_ERROR, "%s: abnormal stop\n", __func__);
16020011
CLG		 515 bus->intr_status |= I2CD_INTR_ABNORMAL;
516 } else {
4960f084 517 aspeed_i2c_set_state(bus, I2CD_MSTOP);
16020011
CLG		 518 i2c_end_transfer(bus->bus);
519 bus->intr_status |= I2CD_INTR_NORMAL_STOP;
520 }
ddabca75 521 bus->cmd &= ~I2CD_M_STOP_CMD;
4960f084 522 aspeed_i2c_set_state(bus, I2CD_IDLE);
16020011 523 }
16020011
CLG		 524}
525
526static void aspeed_i2c_bus_write(void *opaque, hwaddr offset,
527 uint64_t value, unsigned size)
528{
529 AspeedI2CBus *bus = opaque;
51dd4923 530 AspeedI2CClass *aic = ASPEED_I2C_GET_CLASS(bus->controller);
bb626e5b 531 bool handle_rx;
16020011 532
66cc84a1
CLG		 533 trace_aspeed_i2c_bus_write(bus->id, offset, size, value);
534
16020011
CLG		 535 switch (offset) {
536 case I2CD_FUN_CTRL_REG:
537 if (value & I2CD_SLAVE_EN) {
538 qemu_log_mask(LOG_UNIMP, "%s: slave mode not implemented\n",
539 __func__);
540 break;
541 }
542 bus->ctrl = value & 0x0071C3FF;
543 break;
544 case I2CD_AC_TIMING_REG1:
545 bus->timing[0] = value & 0xFFFFF0F;
546 break;
547 case I2CD_AC_TIMING_REG2:
548 bus->timing[1] = value & 0x7;
549 break;
550 case I2CD_INTR_CTRL_REG:
551 bus->intr_ctrl = value & 0x7FFF;
552 break;
553 case I2CD_INTR_STS_REG:
bb626e5b
GR		 554 handle_rx = (bus->intr_status & I2CD_INTR_RX_DONE) &&
555 (value & I2CD_INTR_RX_DONE);
16020011 556 bus->intr_status &= ~(value & 0x7FFF);
5540cb97
CLG		 557 if (!bus->intr_status) {
558 bus->controller->intr_status &= ~(1 << bus->id);
51dd4923 559 qemu_irq_lower(aic->bus_get_irq(bus));
5540cb97 560 }
bb626e5b
GR		 561 if (handle_rx && (bus->cmd & (I2CD_M_RX_CMD | I2CD_M_S_RX_CMD_LAST))) {
562 aspeed_i2c_handle_rx_cmd(bus);
563 aspeed_i2c_bus_raise_interrupt(bus);
564 }
16020011
CLG		 565 break;
566 case I2CD_DEV_ADDR_REG:
567 qemu_log_mask(LOG_UNIMP, "%s: slave mode not implemented\n",
568 __func__);
569 break;
6054fc73
CLG		 570 case I2CD_POOL_CTRL_REG:
571 bus->pool_ctrl &= ~0xffffff;
572 bus->pool_ctrl |= (value & 0xffffff);
573 break;
574
16020011
CLG		 575 case I2CD_BYTE_BUF_REG:
576 bus->buf = (value & I2CD_BYTE_BUF_TX_MASK) << I2CD_BYTE_BUF_TX_SHIFT;
577 break;
578 case I2CD_CMD_REG:
579 if (!aspeed_i2c_bus_is_enabled(bus)) {
580 break;
581 }
582
583 if (!aspeed_i2c_bus_is_master(bus)) {
584 qemu_log_mask(LOG_UNIMP, "%s: slave mode not implemented\n",
585 __func__);
586 break;
587 }
588
545d6bef
CLG		 589 if (!aic->has_dma &&
590 value & (I2CD_RX_DMA_ENABLE | I2CD_TX_DMA_ENABLE)) {
591 qemu_log_mask(LOG_GUEST_ERROR, "%s: No DMA support\n", __func__);
592 break;
593 }
594
16020011 595 aspeed_i2c_bus_handle_cmd(bus, value);
ddabca75 596 aspeed_i2c_bus_raise_interrupt(bus);
16020011 597 break;
545d6bef
CLG		 598 case I2CD_DMA_ADDR:
599 if (!aic->has_dma) {
600 qemu_log_mask(LOG_GUEST_ERROR, "%s: No DMA support\n", __func__);
601 break;
602 }
603
74925159 604 bus->dma_addr = value & 0x3ffffffc;
545d6bef
CLG		 605 break;
606
607 case I2CD_DMA_LEN:
608 if (!aic->has_dma) {
609 qemu_log_mask(LOG_GUEST_ERROR, "%s: No DMA support\n", __func__);
610 break;
611 }
612
613 bus->dma_len = value & 0xfff;
614 if (!bus->dma_len) {
615 qemu_log_mask(LOG_UNIMP, "%s: invalid DMA length\n", __func__);
616 }
617 break;
16020011
CLG		 618
619 default:
620 qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset 0x%" HWADDR_PRIx "\n",
621 __func__, offset);
622 }
623}
624
625static uint64_t aspeed_i2c_ctrl_read(void *opaque, hwaddr offset,
626 unsigned size)
627{
628 AspeedI2CState *s = opaque;
629
630 switch (offset) {
631 case I2C_CTRL_STATUS:
632 return s->intr_status;
aab90b1c
CLG		 633 case I2C_CTRL_GLOBAL:
634 return s->ctrl_global;
16020011
CLG		 635 default:
636 qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset 0x%" HWADDR_PRIx "\n",
637 __func__, offset);
638 break;
639 }
640
641 return -1;
642}
643
644static void aspeed_i2c_ctrl_write(void *opaque, hwaddr offset,
645 uint64_t value, unsigned size)
646{
aab90b1c
CLG		 647 AspeedI2CState *s = opaque;
648
16020011 649 switch (offset) {
aab90b1c
CLG		 650 case I2C_CTRL_GLOBAL:
651 s->ctrl_global = value;
652 break;
16020011
CLG		 653 case I2C_CTRL_STATUS:
654 default:
655 qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset 0x%" HWADDR_PRIx "\n",
656 __func__, offset);
657 break;
658 }
659}
660
661static const MemoryRegionOps aspeed_i2c_bus_ops = {
662 .read = aspeed_i2c_bus_read,
663 .write = aspeed_i2c_bus_write,
664 .endianness = DEVICE_LITTLE_ENDIAN,
665};
666
667static const MemoryRegionOps aspeed_i2c_ctrl_ops = {
668 .read = aspeed_i2c_ctrl_read,
669 .write = aspeed_i2c_ctrl_write,
670 .endianness = DEVICE_LITTLE_ENDIAN,
671};
672
6054fc73
CLG		 673static uint64_t aspeed_i2c_pool_read(void *opaque, hwaddr offset,
674 unsigned size)
675{
676 AspeedI2CState *s = opaque;
677 uint64_t ret = 0;
678 int i;
679
680 for (i = 0; i < size; i++) {
681 ret |= (uint64_t) s->pool[offset + i] << (8 * i);
682 }
683
684 return ret;
685}
686
687static void aspeed_i2c_pool_write(void *opaque, hwaddr offset,
688 uint64_t value, unsigned size)
689{
690 AspeedI2CState *s = opaque;
691 int i;
692
693 for (i = 0; i < size; i++) {
694 s->pool[offset + i] = (value >> (8 * i)) & 0xFF;
695 }
696}
697
698static const MemoryRegionOps aspeed_i2c_pool_ops = {
699 .read = aspeed_i2c_pool_read,
700 .write = aspeed_i2c_pool_write,
701 .endianness = DEVICE_LITTLE_ENDIAN,
702 .valid = {
703 .min_access_size = 1,
704 .max_access_size = 4,
705 },
706};
707
16020011
CLG		 708static const VMStateDescription aspeed_i2c_bus_vmstate = {
709 .name = TYPE_ASPEED_I2C,
545d6bef
CLG		 710 .version_id = 3,
711 .minimum_version_id = 3,
16020011
CLG		 712 .fields = (VMStateField[]) {
713 VMSTATE_UINT8(id, AspeedI2CBus),
714 VMSTATE_UINT32(ctrl, AspeedI2CBus),
715 VMSTATE_UINT32_ARRAY(timing, AspeedI2CBus, 2),
716 VMSTATE_UINT32(intr_ctrl, AspeedI2CBus),
717 VMSTATE_UINT32(intr_status, AspeedI2CBus),
718 VMSTATE_UINT32(cmd, AspeedI2CBus),
719 VMSTATE_UINT32(buf, AspeedI2CBus),
6054fc73 720 VMSTATE_UINT32(pool_ctrl, AspeedI2CBus),
545d6bef
CLG		 721 VMSTATE_UINT32(dma_addr, AspeedI2CBus),
722 VMSTATE_UINT32(dma_len, AspeedI2CBus),
16020011
CLG		 723 VMSTATE_END_OF_LIST()
724 }
725};
726
727static const VMStateDescription aspeed_i2c_vmstate = {
728 .name = TYPE_ASPEED_I2C,
6054fc73
CLG		 729 .version_id = 2,
730 .minimum_version_id = 2,
16020011
CLG		 731 .fields = (VMStateField[]) {
732 VMSTATE_UINT32(intr_status, AspeedI2CState),
733 VMSTATE_STRUCT_ARRAY(busses, AspeedI2CState,
734 ASPEED_I2C_NR_BUSSES, 1, aspeed_i2c_bus_vmstate,
735 AspeedI2CBus),
6054fc73 736 VMSTATE_UINT8_ARRAY(pool, AspeedI2CState, ASPEED_I2C_MAX_POOL_SIZE),
16020011
CLG		 737 VMSTATE_END_OF_LIST()
738 }
739};
740
741static void aspeed_i2c_reset(DeviceState *dev)
742{
16020011
CLG		 743 AspeedI2CState *s = ASPEED_I2C(dev);
744
745 s->intr_status = 0;
60261038
CLG		 746}
747
748static void aspeed_i2c_instance_init(Object *obj)
749{
750 AspeedI2CState *s = ASPEED_I2C(obj);
751 AspeedI2CClass *aic = ASPEED_I2C_GET_CLASS(s);
752 int i;
16020011 753
f7da1aa8 754 for (i = 0; i < aic->num_busses; i++) {
60261038
CLG		 755 object_initialize_child(obj, "bus[*]", &s->busses[i],
756 TYPE_ASPEED_I2C_BUS);
16020011
CLG		 757 }
758}
759
760/*
f7da1aa8 761 * Address Definitions (AST2400 and AST2500)
16020011
CLG		 762 *
763 * 0x000 ... 0x03F: Global Register
764 * 0x040 ... 0x07F: Device 1
765 * 0x080 ... 0x0BF: Device 2
766 * 0x0C0 ... 0x0FF: Device 3
767 * 0x100 ... 0x13F: Device 4
768 * 0x140 ... 0x17F: Device 5
769 * 0x180 ... 0x1BF: Device 6
770 * 0x1C0 ... 0x1FF: Device 7
771 * 0x200 ... 0x2FF: Buffer Pool (unused in linux driver)
772 * 0x300 ... 0x33F: Device 8
773 * 0x340 ... 0x37F: Device 9
774 * 0x380 ... 0x3BF: Device 10
775 * 0x3C0 ... 0x3FF: Device 11
776 * 0x400 ... 0x43F: Device 12
777 * 0x440 ... 0x47F: Device 13
778 * 0x480 ... 0x4BF: Device 14
779 * 0x800 ... 0xFFF: Buffer Pool (unused in linux driver)
780 */
781static void aspeed_i2c_realize(DeviceState *dev, Error **errp)
782{
783 int i;
784 SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
785 AspeedI2CState *s = ASPEED_I2C(dev);
f7da1aa8 786 AspeedI2CClass *aic = ASPEED_I2C_GET_CLASS(s);
16020011
CLG		 787
788 sysbus_init_irq(sbd, &s->irq);
789 memory_region_init_io(&s->iomem, OBJECT(s), &aspeed_i2c_ctrl_ops, s,
790 "aspeed.i2c", 0x1000);
791 sysbus_init_mmio(sbd, &s->iomem);
792
f7da1aa8 793 for (i = 0; i < aic->num_busses; i++) {
60261038 794 Object *bus = OBJECT(&s->busses[i]);
f7da1aa8 795 int offset = i < aic->gap ? 1 : 5;
51dd4923 796
60261038
CLG		 797 if (!object_property_set_link(bus, "controller", OBJECT(s), errp)) {
798 return;
799 }
800
801 if (!object_property_set_uint(bus, "bus-id", i, errp)) {
802 return;
803 }
804
805 if (!sysbus_realize(SYS_BUS_DEVICE(bus), errp)) {
806 return;
807 }
808
f7da1aa8 809 memory_region_add_subregion(&s->iomem, aic->reg_size * (i + offset),
16020011
CLG		 810 &s->busses[i].mr);
811 }
6054fc73
CLG		 812
813 memory_region_init_io(&s->pool_iomem, OBJECT(s), &aspeed_i2c_pool_ops, s,
814 "aspeed.i2c-pool", aic->pool_size);
815 memory_region_add_subregion(&s->iomem, aic->pool_base, &s->pool_iomem);
545d6bef
CLG		 816
817 if (aic->has_dma) {
818 if (!s->dram_mr) {
819 error_setg(errp, TYPE_ASPEED_I2C ": 'dram' link not set");
820 return;
821 }
822
3f7a53b2
CLG		 823 address_space_init(&s->dram_as, s->dram_mr,
824 TYPE_ASPEED_I2C "-dma-dram");
545d6bef 825 }
16020011
CLG		 826}
827
545d6bef
CLG		 828static Property aspeed_i2c_properties[] = {
829 DEFINE_PROP_LINK("dram", AspeedI2CState, dram_mr,
830 TYPE_MEMORY_REGION, MemoryRegion *),
831 DEFINE_PROP_END_OF_LIST(),
832};
833
16020011
CLG		 834static void aspeed_i2c_class_init(ObjectClass *klass, void *data)
835{
836 DeviceClass *dc = DEVICE_CLASS(klass);
837
838 dc->vmsd = &aspeed_i2c_vmstate;
839 dc->reset = aspeed_i2c_reset;
4f67d30b 840 device_class_set_props(dc, aspeed_i2c_properties);
16020011
CLG		 841 dc->realize = aspeed_i2c_realize;
842 dc->desc = "Aspeed I2C Controller";
843}
844
845static const TypeInfo aspeed_i2c_info = {
846 .name = TYPE_ASPEED_I2C,
847 .parent = TYPE_SYS_BUS_DEVICE,
60261038 848 .instance_init = aspeed_i2c_instance_init,
16020011
CLG		 849 .instance_size = sizeof(AspeedI2CState),
850 .class_init = aspeed_i2c_class_init,
f7da1aa8
CLG		 851 .class_size = sizeof(AspeedI2CClass),
852 .abstract = true,
853};
854
60261038
CLG		 855static void aspeed_i2c_bus_reset(DeviceState *dev)
856{
857 AspeedI2CBus *s = ASPEED_I2C_BUS(dev);
858
859 s->intr_ctrl = 0;
860 s->intr_status = 0;
861 s->cmd = 0;
862 s->buf = 0;
863 s->dma_addr = 0;
864 s->dma_len = 0;
865 i2c_end_transfer(s->bus);
866}
867
868static void aspeed_i2c_bus_realize(DeviceState *dev, Error **errp)
869{
870 AspeedI2CBus *s = ASPEED_I2C_BUS(dev);
871 AspeedI2CClass *aic;
872 g_autofree char *name = g_strdup_printf(TYPE_ASPEED_I2C_BUS ".%d", s->id);
873
874 if (!s->controller) {
875 error_setg(errp, TYPE_ASPEED_I2C_BUS ": 'controller' link not set");
876 return;
877 }
878
879 aic = ASPEED_I2C_GET_CLASS(s->controller);
880
881 sysbus_init_irq(SYS_BUS_DEVICE(dev), &s->irq);
882
883 s->bus = i2c_init_bus(dev, name);
884
885 memory_region_init_io(&s->mr, OBJECT(s), &aspeed_i2c_bus_ops,
886 s, name, aic->reg_size);
887 sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->mr);
888}
889
890static Property aspeed_i2c_bus_properties[] = {
891 DEFINE_PROP_UINT8("bus-id", AspeedI2CBus, id, 0),
892 DEFINE_PROP_LINK("controller", AspeedI2CBus, controller, TYPE_ASPEED_I2C,
893 AspeedI2CState *),
894 DEFINE_PROP_END_OF_LIST(),
895};
896
897static void aspeed_i2c_bus_class_init(ObjectClass *klass, void *data)
898{
899 DeviceClass *dc = DEVICE_CLASS(klass);
900
901 dc->desc = "Aspeed I2C Bus";
902 dc->realize = aspeed_i2c_bus_realize;
903 dc->reset = aspeed_i2c_bus_reset;
904 device_class_set_props(dc, aspeed_i2c_bus_properties);
905}
906
907static const TypeInfo aspeed_i2c_bus_info = {
908 .name = TYPE_ASPEED_I2C_BUS,
909 .parent = TYPE_SYS_BUS_DEVICE,
910 .instance_size = sizeof(AspeedI2CBus),
911 .class_init = aspeed_i2c_bus_class_init,
912};
913
51dd4923
CLG		 914static qemu_irq aspeed_2400_i2c_bus_get_irq(AspeedI2CBus *bus)
915{
916 return bus->controller->irq;
917}
918
6054fc73
CLG		 919static uint8_t *aspeed_2400_i2c_bus_pool_base(AspeedI2CBus *bus)
920{
921 uint8_t *pool_page =
922 &bus->controller->pool[I2CD_POOL_PAGE_SEL(bus->ctrl) * 0x100];
923
924 return &pool_page[I2CD_POOL_OFFSET(bus->pool_ctrl)];
925}
926
f7da1aa8
CLG		 927static void aspeed_2400_i2c_class_init(ObjectClass *klass, void *data)
928{
929 DeviceClass *dc = DEVICE_CLASS(klass);
930 AspeedI2CClass *aic = ASPEED_I2C_CLASS(klass);
931
932 dc->desc = "ASPEED 2400 I2C Controller";
933
934 aic->num_busses = 14;
935 aic->reg_size = 0x40;
936 aic->gap = 7;
51dd4923 937 aic->bus_get_irq = aspeed_2400_i2c_bus_get_irq;
6054fc73
CLG		 938 aic->pool_size = 0x800;
939 aic->pool_base = 0x800;
940 aic->bus_pool_base = aspeed_2400_i2c_bus_pool_base;
f7da1aa8
CLG		 941}
942
943static const TypeInfo aspeed_2400_i2c_info = {
944 .name = TYPE_ASPEED_2400_I2C,
945 .parent = TYPE_ASPEED_I2C,
946 .class_init = aspeed_2400_i2c_class_init,
947};
948
51dd4923
CLG		 949static qemu_irq aspeed_2500_i2c_bus_get_irq(AspeedI2CBus *bus)
950{
951 return bus->controller->irq;
952}
953
6054fc73
CLG		 954static uint8_t *aspeed_2500_i2c_bus_pool_base(AspeedI2CBus *bus)
955{
956 return &bus->controller->pool[bus->id * 0x10];
957}
958
f7da1aa8
CLG		 959static void aspeed_2500_i2c_class_init(ObjectClass *klass, void *data)
960{
961 DeviceClass *dc = DEVICE_CLASS(klass);
962 AspeedI2CClass *aic = ASPEED_I2C_CLASS(klass);
963
964 dc->desc = "ASPEED 2500 I2C Controller";
965
966 aic->num_busses = 14;
967 aic->reg_size = 0x40;
968 aic->gap = 7;
51dd4923 969 aic->bus_get_irq = aspeed_2500_i2c_bus_get_irq;
6054fc73
CLG		 970 aic->pool_size = 0x100;
971 aic->pool_base = 0x200;
972 aic->bus_pool_base = aspeed_2500_i2c_bus_pool_base;
aab90b1c 973 aic->check_sram = true;
545d6bef 974 aic->has_dma = true;
f7da1aa8
CLG		 975}
976
977static const TypeInfo aspeed_2500_i2c_info = {
978 .name = TYPE_ASPEED_2500_I2C,
979 .parent = TYPE_ASPEED_I2C,
980 .class_init = aspeed_2500_i2c_class_init,
16020011
CLG		 981};
982
51dd4923
CLG		 983static qemu_irq aspeed_2600_i2c_bus_get_irq(AspeedI2CBus *bus)
984{
985 return bus->irq;
986}
987
6054fc73
CLG		 988static uint8_t *aspeed_2600_i2c_bus_pool_base(AspeedI2CBus *bus)
989{
990 return &bus->controller->pool[bus->id * 0x20];
991}
992
51dd4923
CLG		 993static void aspeed_2600_i2c_class_init(ObjectClass *klass, void *data)
994{
995 DeviceClass *dc = DEVICE_CLASS(klass);
996 AspeedI2CClass *aic = ASPEED_I2C_CLASS(klass);
997
998 dc->desc = "ASPEED 2600 I2C Controller";
999
1000 aic->num_busses = 16;
1001 aic->reg_size = 0x80;
1002 aic->gap = -1; /* no gap */
1003 aic->bus_get_irq = aspeed_2600_i2c_bus_get_irq;
6054fc73
CLG		 1004 aic->pool_size = 0x200;
1005 aic->pool_base = 0xC00;
1006 aic->bus_pool_base = aspeed_2600_i2c_bus_pool_base;
545d6bef 1007 aic->has_dma = true;
51dd4923
CLG		 1008}
1009
1010static const TypeInfo aspeed_2600_i2c_info = {
1011 .name = TYPE_ASPEED_2600_I2C,
1012 .parent = TYPE_ASPEED_I2C,
1013 .class_init = aspeed_2600_i2c_class_init,
1014};
1015
16020011
CLG		 1016static void aspeed_i2c_register_types(void)
1017{
60261038 1018 type_register_static(&aspeed_i2c_bus_info);
16020011 1019 type_register_static(&aspeed_i2c_info);
f7da1aa8
CLG		 1020 type_register_static(&aspeed_2400_i2c_info);
1021 type_register_static(&aspeed_2500_i2c_info);
51dd4923 1022 type_register_static(&aspeed_2600_i2c_info);
16020011
CLG		 1023}
1024
1025type_init(aspeed_i2c_register_types)
1026
1027
7a204cbd 1028I2CBus *aspeed_i2c_get_bus(AspeedI2CState *s, int busnr)
16020011 1029{
f7da1aa8 1030 AspeedI2CClass *aic = ASPEED_I2C_GET_CLASS(s);
16020011
CLG		 1031 I2CBus *bus = NULL;
1032
f7da1aa8 1033 if (busnr >= 0 && busnr < aic->num_busses) {
16020011
CLG		 1034 bus = s->busses[busnr].bus;
1035 }
1036
1037 return bus;
1038}
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