?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
hw/ppc: Drop useless CONFIG_KVM ifdefery
[qemu/ar7.git] / hw / i2c / aspeed_i2c.c
blob219ad3806f159c0d0f9795ebfbbe7ed82d55aacf
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"
23 #include "qemu/log.h"
24 #include "qemu/module.h"
25 #include "hw/i2c/aspeed_i2c.h"
26
27 /* I2C Global Register */
28
29 #define I2C_CTRL_STATUS 0x00 /* Device Interrupt Status */
30 #define I2C_CTRL_ASSIGN 0x08 /* Device Interrupt Target
31 Assignment */
32
33 /* I2C Device (Bus) Register */
34
35 #define I2CD_FUN_CTRL_REG 0x00 /* I2CD Function Control */
36 #define I2CD_BUFF_SEL_MASK (0x7 << 20)
37 #define I2CD_BUFF_SEL(x) (x << 20)
38 #define I2CD_M_SDA_LOCK_EN (0x1 << 16)
39 #define I2CD_MULTI_MASTER_DIS (0x1 << 15)
40 #define I2CD_M_SCL_DRIVE_EN (0x1 << 14)
41 #define I2CD_MSB_STS (0x1 << 9)
42 #define I2CD_SDA_DRIVE_1T_EN (0x1 << 8)
43 #define I2CD_M_SDA_DRIVE_1T_EN (0x1 << 7)
44 #define I2CD_M_HIGH_SPEED_EN (0x1 << 6)
45 #define I2CD_DEF_ADDR_EN (0x1 << 5)
46 #define I2CD_DEF_ALERT_EN (0x1 << 4)
47 #define I2CD_DEF_ARP_EN (0x1 << 3)
48 #define I2CD_DEF_GCALL_EN (0x1 << 2)
49 #define I2CD_SLAVE_EN (0x1 << 1)
50 #define I2CD_MASTER_EN (0x1)
51
52 #define I2CD_AC_TIMING_REG1 0x04 /* Clock and AC Timing Control #1 */
53 #define I2CD_AC_TIMING_REG2 0x08 /* Clock and AC Timing Control #1 */
54 #define I2CD_INTR_CTRL_REG 0x0c /* I2CD Interrupt Control */
55 #define I2CD_INTR_STS_REG 0x10 /* I2CD Interrupt Status */
56
57 #define I2CD_INTR_SLAVE_ADDR_MATCH (0x1 << 31) /* 0: addr1 1: addr2 */
58 #define I2CD_INTR_SLAVE_ADDR_RX_PENDING (0x1 << 30)
59 /* bits[19-16] Reserved */
60
61 /* All bits below are cleared by writing 1 */
62 #define I2CD_INTR_SLAVE_INACTIVE_TIMEOUT (0x1 << 15)
63 #define I2CD_INTR_SDA_DL_TIMEOUT (0x1 << 14)
64 #define I2CD_INTR_BUS_RECOVER_DONE (0x1 << 13)
65 #define I2CD_INTR_SMBUS_ALERT (0x1 << 12) /* Bus [0-3] only */
66 #define I2CD_INTR_SMBUS_ARP_ADDR (0x1 << 11) /* Removed */
67 #define I2CD_INTR_SMBUS_DEV_ALERT_ADDR (0x1 << 10) /* Removed */
68 #define I2CD_INTR_SMBUS_DEF_ADDR (0x1 << 9) /* Removed */
69 #define I2CD_INTR_GCALL_ADDR (0x1 << 8) /* Removed */
70 #define I2CD_INTR_SLAVE_ADDR_RX_MATCH (0x1 << 7) /* use RX_DONE */
71 #define I2CD_INTR_SCL_TIMEOUT (0x1 << 6)
72 #define I2CD_INTR_ABNORMAL (0x1 << 5)
73 #define I2CD_INTR_NORMAL_STOP (0x1 << 4)
74 #define I2CD_INTR_ARBIT_LOSS (0x1 << 3)
75 #define I2CD_INTR_RX_DONE (0x1 << 2)
76 #define I2CD_INTR_TX_NAK (0x1 << 1)
77 #define I2CD_INTR_TX_ACK (0x1 << 0)
78
79 #define I2CD_CMD_REG 0x14 /* I2CD Command/Status */
80 #define I2CD_SDA_OE (0x1 << 28)
81 #define I2CD_SDA_O (0x1 << 27)
82 #define I2CD_SCL_OE (0x1 << 26)
83 #define I2CD_SCL_O (0x1 << 25)
84 #define I2CD_TX_TIMING (0x1 << 24)
85 #define I2CD_TX_STATUS (0x1 << 23)
86
87 #define I2CD_TX_STATE_SHIFT 19 /* Tx State Machine */
88 #define I2CD_TX_STATE_MASK 0xf
89 #define I2CD_IDLE 0x0
90 #define I2CD_MACTIVE 0x8
91 #define I2CD_MSTART 0x9
92 #define I2CD_MSTARTR 0xa
93 #define I2CD_MSTOP 0xb
94 #define I2CD_MTXD 0xc
95 #define I2CD_MRXACK 0xd
96 #define I2CD_MRXD 0xe
97 #define I2CD_MTXACK 0xf
98 #define I2CD_SWAIT 0x1
99 #define I2CD_SRXD 0x4
100 #define I2CD_STXACK 0x5
101 #define I2CD_STXD 0x6
102 #define I2CD_SRXACK 0x7
103 #define I2CD_RECOVER 0x3
104
105 #define I2CD_SCL_LINE_STS (0x1 << 18)
106 #define I2CD_SDA_LINE_STS (0x1 << 17)
107 #define I2CD_BUS_BUSY_STS (0x1 << 16)
108 #define I2CD_SDA_OE_OUT_DIR (0x1 << 15)
109 #define I2CD_SDA_O_OUT_DIR (0x1 << 14)
110 #define I2CD_SCL_OE_OUT_DIR (0x1 << 13)
111 #define I2CD_SCL_O_OUT_DIR (0x1 << 12)
112 #define I2CD_BUS_RECOVER_CMD_EN (0x1 << 11)
113 #define I2CD_S_ALT_EN (0x1 << 10)
114 #define I2CD_RX_DMA_ENABLE (0x1 << 9)
115 #define I2CD_TX_DMA_ENABLE (0x1 << 8)
116
117 /* Command Bit */
118 #define I2CD_M_STOP_CMD (0x1 << 5)
119 #define I2CD_M_S_RX_CMD_LAST (0x1 << 4)
120 #define I2CD_M_RX_CMD (0x1 << 3)
121 #define I2CD_S_TX_CMD (0x1 << 2)
122 #define I2CD_M_TX_CMD (0x1 << 1)
123 #define I2CD_M_START_CMD (0x1)
124
125 #define I2CD_DEV_ADDR_REG 0x18 /* Slave Device Address */
126 #define I2CD_BUF_CTRL_REG 0x1c /* Pool Buffer Control */
127 #define I2CD_BYTE_BUF_REG 0x20 /* Transmit/Receive Byte Buffer */
128 #define I2CD_BYTE_BUF_TX_SHIFT 0
129 #define I2CD_BYTE_BUF_TX_MASK 0xff
130 #define I2CD_BYTE_BUF_RX_SHIFT 8
131 #define I2CD_BYTE_BUF_RX_MASK 0xff
132
133
134 static inline bool aspeed_i2c_bus_is_master(AspeedI2CBus *bus)
135 {
136 return bus->ctrl & I2CD_MASTER_EN;
137 }
138
139 static inline bool aspeed_i2c_bus_is_enabled(AspeedI2CBus *bus)
140 {
141 return bus->ctrl & (I2CD_MASTER_EN | I2CD_SLAVE_EN);
142 }
143
144 static inline void aspeed_i2c_bus_raise_interrupt(AspeedI2CBus *bus)
145 {
146 bus->intr_status &= bus->intr_ctrl;
147 if (bus->intr_status) {
148 bus->controller->intr_status |= 1 << bus->id;
149 qemu_irq_raise(bus->controller->irq);
150 }
151 }
152
153 static uint64_t aspeed_i2c_bus_read(void *opaque, hwaddr offset,
154 unsigned size)
155 {
156 AspeedI2CBus *bus = opaque;
157
158 switch (offset) {
159 case I2CD_FUN_CTRL_REG:
160 return bus->ctrl;
161 case I2CD_AC_TIMING_REG1:
162 return bus->timing[0];
163 case I2CD_AC_TIMING_REG2:
164 return bus->timing[1];
165 case I2CD_INTR_CTRL_REG:
166 return bus->intr_ctrl;
167 case I2CD_INTR_STS_REG:
168 return bus->intr_status;
169 case I2CD_BYTE_BUF_REG:
170 return bus->buf;
171 case I2CD_CMD_REG:
172 return bus->cmd | (i2c_bus_busy(bus->bus) << 16);
173 default:
174 qemu_log_mask(LOG_GUEST_ERROR,
175 "%s: Bad offset 0x%" HWADDR_PRIx "\n", __func__, offset);
176 return -1;
177 }
178 }
179
180 static void aspeed_i2c_set_state(AspeedI2CBus *bus, uint8_t state)
181 {
182 bus->cmd &= ~(I2CD_TX_STATE_MASK << I2CD_TX_STATE_SHIFT);
183 bus->cmd |= (state & I2CD_TX_STATE_MASK) << I2CD_TX_STATE_SHIFT;
184 }
185
186 static uint8_t aspeed_i2c_get_state(AspeedI2CBus *bus)
187 {
188 return (bus->cmd >> I2CD_TX_STATE_SHIFT) & I2CD_TX_STATE_MASK;
189 }
190
191 static void aspeed_i2c_handle_rx_cmd(AspeedI2CBus *bus)
192 {
193 uint8_t ret;
194
195 aspeed_i2c_set_state(bus, I2CD_MRXD);
196 ret = i2c_recv(bus->bus);
197 bus->intr_status |= I2CD_INTR_RX_DONE;
198 bus->buf = (ret & I2CD_BYTE_BUF_RX_MASK) << I2CD_BYTE_BUF_RX_SHIFT;
199 if (bus->cmd & I2CD_M_S_RX_CMD_LAST) {
200 i2c_nack(bus->bus);
201 }
202 bus->cmd &= ~(I2CD_M_RX_CMD | I2CD_M_S_RX_CMD_LAST);
203 aspeed_i2c_set_state(bus, I2CD_MACTIVE);
204 }
205
206 /*
207 * The state machine needs some refinement. It is only used to track
208 * invalid STOP commands for the moment.
209 */
210 static void aspeed_i2c_bus_handle_cmd(AspeedI2CBus *bus, uint64_t value)
211 {
212 bus->cmd &= ~0xFFFF;
213 bus->cmd |= value & 0xFFFF;
214
215 if (bus->cmd & I2CD_M_START_CMD) {
216 uint8_t state = aspeed_i2c_get_state(bus) & I2CD_MACTIVE ?
217 I2CD_MSTARTR : I2CD_MSTART;
218
219 aspeed_i2c_set_state(bus, state);
220
221 if (i2c_start_transfer(bus->bus, extract32(bus->buf, 1, 7),
222 extract32(bus->buf, 0, 1))) {
223 bus->intr_status |= I2CD_INTR_TX_NAK;
224 } else {
225 bus->intr_status |= I2CD_INTR_TX_ACK;
226 }
227
228 /* START command is also a TX command, as the slave address is
229 * sent on the bus */
230 bus->cmd &= ~(I2CD_M_START_CMD | I2CD_M_TX_CMD);
231
232 /* No slave found */
233 if (!i2c_bus_busy(bus->bus)) {
234 return;
235 }
236 aspeed_i2c_set_state(bus, I2CD_MACTIVE);
237 }
238
239 if (bus->cmd & I2CD_M_TX_CMD) {
240 aspeed_i2c_set_state(bus, I2CD_MTXD);
241 if (i2c_send(bus->bus, bus->buf)) {
242 bus->intr_status |= (I2CD_INTR_TX_NAK);
243 i2c_end_transfer(bus->bus);
244 } else {
245 bus->intr_status |= I2CD_INTR_TX_ACK;
246 }
247 bus->cmd &= ~I2CD_M_TX_CMD;
248 aspeed_i2c_set_state(bus, I2CD_MACTIVE);
249 }
250
251 if ((bus->cmd & (I2CD_M_RX_CMD | I2CD_M_S_RX_CMD_LAST)) &&
252 !(bus->intr_status & I2CD_INTR_RX_DONE)) {
253 aspeed_i2c_handle_rx_cmd(bus);
254 }
255
256 if (bus->cmd & I2CD_M_STOP_CMD) {
257 if (!(aspeed_i2c_get_state(bus) & I2CD_MACTIVE)) {
258 qemu_log_mask(LOG_GUEST_ERROR, "%s: abnormal stop\n", __func__);
259 bus->intr_status |= I2CD_INTR_ABNORMAL;
260 } else {
261 aspeed_i2c_set_state(bus, I2CD_MSTOP);
262 i2c_end_transfer(bus->bus);
263 bus->intr_status |= I2CD_INTR_NORMAL_STOP;
264 }
265 bus->cmd &= ~I2CD_M_STOP_CMD;
266 aspeed_i2c_set_state(bus, I2CD_IDLE);
267 }
268 }
269
270 static void aspeed_i2c_bus_write(void *opaque, hwaddr offset,
271 uint64_t value, unsigned size)
272 {
273 AspeedI2CBus *bus = opaque;
274 bool handle_rx;
275
276 switch (offset) {
277 case I2CD_FUN_CTRL_REG:
278 if (value & I2CD_SLAVE_EN) {
279 qemu_log_mask(LOG_UNIMP, "%s: slave mode not implemented\n",
280 __func__);
281 break;
282 }
283 bus->ctrl = value & 0x0071C3FF;
284 break;
285 case I2CD_AC_TIMING_REG1:
286 bus->timing[0] = value & 0xFFFFF0F;
287 break;
288 case I2CD_AC_TIMING_REG2:
289 bus->timing[1] = value & 0x7;
290 break;
291 case I2CD_INTR_CTRL_REG:
292 bus->intr_ctrl = value & 0x7FFF;
293 break;
294 case I2CD_INTR_STS_REG:
295 handle_rx = (bus->intr_status & I2CD_INTR_RX_DONE) &&
296 (value & I2CD_INTR_RX_DONE);
297 bus->intr_status &= ~(value & 0x7FFF);
298 if (!bus->intr_status) {
299 bus->controller->intr_status &= ~(1 << bus->id);
300 qemu_irq_lower(bus->controller->irq);
301 }
302 if (handle_rx && (bus->cmd & (I2CD_M_RX_CMD | I2CD_M_S_RX_CMD_LAST))) {
303 aspeed_i2c_handle_rx_cmd(bus);
304 aspeed_i2c_bus_raise_interrupt(bus);
305 }
306 break;
307 case I2CD_DEV_ADDR_REG:
308 qemu_log_mask(LOG_UNIMP, "%s: slave mode not implemented\n",
309 __func__);
310 break;
311 case I2CD_BYTE_BUF_REG:
312 bus->buf = (value & I2CD_BYTE_BUF_TX_MASK) << I2CD_BYTE_BUF_TX_SHIFT;
313 break;
314 case I2CD_CMD_REG:
315 if (!aspeed_i2c_bus_is_enabled(bus)) {
316 break;
317 }
318
319 if (!aspeed_i2c_bus_is_master(bus)) {
320 qemu_log_mask(LOG_UNIMP, "%s: slave mode not implemented\n",
321 __func__);
322 break;
323 }
324
325 aspeed_i2c_bus_handle_cmd(bus, value);
326 aspeed_i2c_bus_raise_interrupt(bus);
327 break;
328
329 default:
330 qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset 0x%" HWADDR_PRIx "\n",
331 __func__, offset);
332 }
333 }
334
335 static uint64_t aspeed_i2c_ctrl_read(void *opaque, hwaddr offset,
336 unsigned size)
337 {
338 AspeedI2CState *s = opaque;
339
340 switch (offset) {
341 case I2C_CTRL_STATUS:
342 return s->intr_status;
343 default:
344 qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset 0x%" HWADDR_PRIx "\n",
345 __func__, offset);
346 break;
347 }
348
349 return -1;
350 }
351
352 static void aspeed_i2c_ctrl_write(void *opaque, hwaddr offset,
353 uint64_t value, unsigned size)
354 {
355 switch (offset) {
356 case I2C_CTRL_STATUS:
357 default:
358 qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset 0x%" HWADDR_PRIx "\n",
359 __func__, offset);
360 break;
361 }
362 }
363
364 static const MemoryRegionOps aspeed_i2c_bus_ops = {
365 .read = aspeed_i2c_bus_read,
366 .write = aspeed_i2c_bus_write,
367 .endianness = DEVICE_LITTLE_ENDIAN,
368 };
369
370 static const MemoryRegionOps aspeed_i2c_ctrl_ops = {
371 .read = aspeed_i2c_ctrl_read,
372 .write = aspeed_i2c_ctrl_write,
373 .endianness = DEVICE_LITTLE_ENDIAN,
374 };
375
376 static const VMStateDescription aspeed_i2c_bus_vmstate = {
377 .name = TYPE_ASPEED_I2C,
378 .version_id = 1,
379 .minimum_version_id = 1,
380 .fields = (VMStateField[]) {
381 VMSTATE_UINT8(id, AspeedI2CBus),
382 VMSTATE_UINT32(ctrl, AspeedI2CBus),
383 VMSTATE_UINT32_ARRAY(timing, AspeedI2CBus, 2),
384 VMSTATE_UINT32(intr_ctrl, AspeedI2CBus),
385 VMSTATE_UINT32(intr_status, AspeedI2CBus),
386 VMSTATE_UINT32(cmd, AspeedI2CBus),
387 VMSTATE_UINT32(buf, AspeedI2CBus),
388 VMSTATE_END_OF_LIST()
389 }
390 };
391
392 static const VMStateDescription aspeed_i2c_vmstate = {
393 .name = TYPE_ASPEED_I2C,
394 .version_id = 1,
395 .minimum_version_id = 1,
396 .fields = (VMStateField[]) {
397 VMSTATE_UINT32(intr_status, AspeedI2CState),
398 VMSTATE_STRUCT_ARRAY(busses, AspeedI2CState,
399 ASPEED_I2C_NR_BUSSES, 1, aspeed_i2c_bus_vmstate,
400 AspeedI2CBus),
401 VMSTATE_END_OF_LIST()
402 }
403 };
404
405 static void aspeed_i2c_reset(DeviceState *dev)
406 {
407 int i;
408 AspeedI2CState *s = ASPEED_I2C(dev);
409
410 s->intr_status = 0;
411
412 for (i = 0; i < ASPEED_I2C_NR_BUSSES; i++) {
413 s->busses[i].intr_ctrl = 0;
414 s->busses[i].intr_status = 0;
415 s->busses[i].cmd = 0;
416 s->busses[i].buf = 0;
417 i2c_end_transfer(s->busses[i].bus);
418 }
419 }
420
421 /*
422 * Address Definitions
423 *
424 * 0x000 ... 0x03F: Global Register
425 * 0x040 ... 0x07F: Device 1
426 * 0x080 ... 0x0BF: Device 2
427 * 0x0C0 ... 0x0FF: Device 3
428 * 0x100 ... 0x13F: Device 4
429 * 0x140 ... 0x17F: Device 5
430 * 0x180 ... 0x1BF: Device 6
431 * 0x1C0 ... 0x1FF: Device 7
432 * 0x200 ... 0x2FF: Buffer Pool (unused in linux driver)
433 * 0x300 ... 0x33F: Device 8
434 * 0x340 ... 0x37F: Device 9
435 * 0x380 ... 0x3BF: Device 10
436 * 0x3C0 ... 0x3FF: Device 11
437 * 0x400 ... 0x43F: Device 12
438 * 0x440 ... 0x47F: Device 13
439 * 0x480 ... 0x4BF: Device 14
440 * 0x800 ... 0xFFF: Buffer Pool (unused in linux driver)
441 */
442 static void aspeed_i2c_realize(DeviceState *dev, Error **errp)
443 {
444 int i;
445 SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
446 AspeedI2CState *s = ASPEED_I2C(dev);
447
448 sysbus_init_irq(sbd, &s->irq);
449 memory_region_init_io(&s->iomem, OBJECT(s), &aspeed_i2c_ctrl_ops, s,
450 "aspeed.i2c", 0x1000);
451 sysbus_init_mmio(sbd, &s->iomem);
452
453 for (i = 0; i < ASPEED_I2C_NR_BUSSES; i++) {
454 char name[16];
455 int offset = i < 7 ? 1 : 5;
456 snprintf(name, sizeof(name), "aspeed.i2c.%d", i);
457 s->busses[i].controller = s;
458 s->busses[i].id = i;
459 s->busses[i].bus = i2c_init_bus(dev, name);
460 memory_region_init_io(&s->busses[i].mr, OBJECT(dev),
461 &aspeed_i2c_bus_ops, &s->busses[i], name, 0x40);
462 memory_region_add_subregion(&s->iomem, 0x40 * (i + offset),
463 &s->busses[i].mr);
464 }
465 }
466
467 static void aspeed_i2c_class_init(ObjectClass *klass, void *data)
468 {
469 DeviceClass *dc = DEVICE_CLASS(klass);
470
471 dc->vmsd = &aspeed_i2c_vmstate;
472 dc->reset = aspeed_i2c_reset;
473 dc->realize = aspeed_i2c_realize;
474 dc->desc = "Aspeed I2C Controller";
475 }
476
477 static const TypeInfo aspeed_i2c_info = {
478 .name = TYPE_ASPEED_I2C,
479 .parent = TYPE_SYS_BUS_DEVICE,
480 .instance_size = sizeof(AspeedI2CState),
481 .class_init = aspeed_i2c_class_init,
482 };
483
484 static void aspeed_i2c_register_types(void)
485 {
486 type_register_static(&aspeed_i2c_info);
487 }
488
489 type_init(aspeed_i2c_register_types)
490
491
492 I2CBus *aspeed_i2c_get_bus(DeviceState *dev, int busnr)
493 {
494 AspeedI2CState *s = ASPEED_I2C(dev);
495 I2CBus *bus = NULL;
496
497 if (busnr >= 0 && busnr < ASPEED_I2C_NR_BUSSES) {
498 bus = s->busses[busnr].bus;
499 }
500
501 return bus;
502 }
AR7 emulation for QEMU