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10#include "qemu/osdep.h"
11#include "sysemu/blockdev.h"
12#include "hw/sysbus.h"
13#include "hw/sd/sd.h"
14#include "qemu/log.h"
15#include "qemu/module.h"
16#include "qapi/error.h"
17
18
19
20#ifdef DEBUG_PL181
21#define DPRINTF(fmt, ...) \
22do { printf("pl181: " fmt , ## __VA_ARGS__); } while (0)
23#else
24#define DPRINTF(fmt, ...) do {} while(0)
25#endif
26
27#define PL181_FIFO_LEN 16
28
29#define TYPE_PL181 "pl181"
30#define PL181(obj) OBJECT_CHECK(PL181State, (obj), TYPE_PL181)
31
32typedef struct PL181State {
33 SysBusDevice parent_obj;
34
35 MemoryRegion iomem;
36 SDState *card;
37 uint32_t clock;
38 uint32_t power;
39 uint32_t cmdarg;
40 uint32_t cmd;
41 uint32_t datatimer;
42 uint32_t datalength;
43 uint32_t respcmd;
44 uint32_t response[4];
45 uint32_t datactrl;
46 uint32_t datacnt;
47 uint32_t status;
48 uint32_t mask[2];
49 int32_t fifo_pos;
50 int32_t fifo_len;
51
52
53
54
55
56 int32_t linux_hack;
57 uint32_t fifo[PL181_FIFO_LEN];
58 qemu_irq irq[2];
59
60 qemu_irq cardstatus[2];
61} PL181State;
62
63static const VMStateDescription vmstate_pl181 = {
64 .name = "pl181",
65 .version_id = 1,
66 .minimum_version_id = 1,
67 .fields = (VMStateField[]) {
68 VMSTATE_UINT32(clock, PL181State),
69 VMSTATE_UINT32(power, PL181State),
70 VMSTATE_UINT32(cmdarg, PL181State),
71 VMSTATE_UINT32(cmd, PL181State),
72 VMSTATE_UINT32(datatimer, PL181State),
73 VMSTATE_UINT32(datalength, PL181State),
74 VMSTATE_UINT32(respcmd, PL181State),
75 VMSTATE_UINT32_ARRAY(response, PL181State, 4),
76 VMSTATE_UINT32(datactrl, PL181State),
77 VMSTATE_UINT32(datacnt, PL181State),
78 VMSTATE_UINT32(status, PL181State),
79 VMSTATE_UINT32_ARRAY(mask, PL181State, 2),
80 VMSTATE_INT32(fifo_pos, PL181State),
81 VMSTATE_INT32(fifo_len, PL181State),
82 VMSTATE_INT32(linux_hack, PL181State),
83 VMSTATE_UINT32_ARRAY(fifo, PL181State, PL181_FIFO_LEN),
84 VMSTATE_END_OF_LIST()
85 }
86};
87
88#define PL181_CMD_INDEX 0x3f
89#define PL181_CMD_RESPONSE (1 << 6)
90#define PL181_CMD_LONGRESP (1 << 7)
91#define PL181_CMD_INTERRUPT (1 << 8)
92#define PL181_CMD_PENDING (1 << 9)
93#define PL181_CMD_ENABLE (1 << 10)
94
95#define PL181_DATA_ENABLE (1 << 0)
96#define PL181_DATA_DIRECTION (1 << 1)
97#define PL181_DATA_MODE (1 << 2)
98#define PL181_DATA_DMAENABLE (1 << 3)
99
100#define PL181_STATUS_CMDCRCFAIL (1 << 0)
101#define PL181_STATUS_DATACRCFAIL (1 << 1)
102#define PL181_STATUS_CMDTIMEOUT (1 << 2)
103#define PL181_STATUS_DATATIMEOUT (1 << 3)
104#define PL181_STATUS_TXUNDERRUN (1 << 4)
105#define PL181_STATUS_RXOVERRUN (1 << 5)
106#define PL181_STATUS_CMDRESPEND (1 << 6)
107#define PL181_STATUS_CMDSENT (1 << 7)
108#define PL181_STATUS_DATAEND (1 << 8)
109#define PL181_STATUS_DATABLOCKEND (1 << 10)
110#define PL181_STATUS_CMDACTIVE (1 << 11)
111#define PL181_STATUS_TXACTIVE (1 << 12)
112#define PL181_STATUS_RXACTIVE (1 << 13)
113#define PL181_STATUS_TXFIFOHALFEMPTY (1 << 14)
114#define PL181_STATUS_RXFIFOHALFFULL (1 << 15)
115#define PL181_STATUS_TXFIFOFULL (1 << 16)
116#define PL181_STATUS_RXFIFOFULL (1 << 17)
117#define PL181_STATUS_TXFIFOEMPTY (1 << 18)
118#define PL181_STATUS_RXFIFOEMPTY (1 << 19)
119#define PL181_STATUS_TXDATAAVLBL (1 << 20)
120#define PL181_STATUS_RXDATAAVLBL (1 << 21)
121
122#define PL181_STATUS_TX_FIFO (PL181_STATUS_TXACTIVE \
123 |PL181_STATUS_TXFIFOHALFEMPTY \
124 |PL181_STATUS_TXFIFOFULL \
125 |PL181_STATUS_TXFIFOEMPTY \
126 |PL181_STATUS_TXDATAAVLBL)
127#define PL181_STATUS_RX_FIFO (PL181_STATUS_RXACTIVE \
128 |PL181_STATUS_RXFIFOHALFFULL \
129 |PL181_STATUS_RXFIFOFULL \
130 |PL181_STATUS_RXFIFOEMPTY \
131 |PL181_STATUS_RXDATAAVLBL)
132
133static const unsigned char pl181_id[] =
134{ 0x81, 0x11, 0x04, 0x00, 0x0d, 0xf0, 0x05, 0xb1 };
135
136static void pl181_update(PL181State *s)
137{
138 int i;
139 for (i = 0; i < 2; i++) {
140 qemu_set_irq(s->irq[i], (s->status & s->mask[i]) != 0);
141 }
142}
143
144static void pl181_fifo_push(PL181State *s, uint32_t value)
145{
146 int n;
147
148 if (s->fifo_len == PL181_FIFO_LEN) {
149 fprintf(stderr, "pl181: FIFO overflow\n");
150 return;
151 }
152 n = (s->fifo_pos + s->fifo_len) & (PL181_FIFO_LEN - 1);
153 s->fifo_len++;
154 s->fifo[n] = value;
155 DPRINTF("FIFO push %08x\n", (int)value);
156}
157
158static uint32_t pl181_fifo_pop(PL181State *s)
159{
160 uint32_t value;
161
162 if (s->fifo_len == 0) {
163 fprintf(stderr, "pl181: FIFO underflow\n");
164 return 0;
165 }
166 value = s->fifo[s->fifo_pos];
167 s->fifo_len--;
168 s->fifo_pos = (s->fifo_pos + 1) & (PL181_FIFO_LEN - 1);
169 DPRINTF("FIFO pop %08x\n", (int)value);
170 return value;
171}
172
173static void pl181_send_command(PL181State *s)
174{
175 SDRequest request;
176 uint8_t response[16];
177 int rlen;
178
179 request.cmd = s->cmd & PL181_CMD_INDEX;
180 request.arg = s->cmdarg;
181 DPRINTF("Command %d %08x\n", request.cmd, request.arg);
182 rlen = sd_do_command(s->card, &request, response);
183 if (rlen < 0)
184 goto error;
185 if (s->cmd & PL181_CMD_RESPONSE) {
186 if (rlen == 0 || (rlen == 4 && (s->cmd & PL181_CMD_LONGRESP)))
187 goto error;
188 if (rlen != 4 && rlen != 16)
189 goto error;
190 s->response[0] = ldl_be_p(&response[0]);
191 if (rlen == 4) {
192 s->response[1] = s->response[2] = s->response[3] = 0;
193 } else {
194 s->response[1] = ldl_be_p(&response[4]);
195 s->response[2] = ldl_be_p(&response[8]);
196 s->response[3] = ldl_be_p(&response[12]) & ~1;
197 }
198 DPRINTF("Response received\n");
199 s->status |= PL181_STATUS_CMDRESPEND;
200 } else {
201 DPRINTF("Command sent\n");
202 s->status |= PL181_STATUS_CMDSENT;
203 }
204 return;
205
206error:
207 DPRINTF("Timeout\n");
208 s->status |= PL181_STATUS_CMDTIMEOUT;
209}
210
211
212
213
214
215static void pl181_fifo_run(PL181State *s)
216{
217 uint32_t bits;
218 uint32_t value = 0;
219 int n;
220 int is_read;
221
222 is_read = (s->datactrl & PL181_DATA_DIRECTION) != 0;
223 if (s->datacnt != 0 && (!is_read || sd_data_ready(s->card))
224 && !s->linux_hack) {
225 if (is_read) {
226 n = 0;
227 while (s->datacnt && s->fifo_len < PL181_FIFO_LEN) {
228 value |= (uint32_t)sd_read_data(s->card) << (n * 8);
229 s->datacnt--;
230 n++;
231 if (n == 4) {
232 pl181_fifo_push(s, value);
233 n = 0;
234 value = 0;
235 }
236 }
237 if (n != 0) {
238 pl181_fifo_push(s, value);
239 }
240 } else {
241 n = 0;
242 while (s->datacnt > 0 && (s->fifo_len > 0 || n > 0)) {
243 if (n == 0) {
244 value = pl181_fifo_pop(s);
245 n = 4;
246 }
247 n--;
248 s->datacnt--;
249 sd_write_data(s->card, value & 0xff);
250 value >>= 8;
251 }
252 }
253 }
254 s->status &= ~(PL181_STATUS_RX_FIFO | PL181_STATUS_TX_FIFO);
255 if (s->datacnt == 0) {
256 s->status |= PL181_STATUS_DATAEND;
257
258 s->status |= PL181_STATUS_DATABLOCKEND;
259 DPRINTF("Transfer Complete\n");
260 }
261 if (s->datacnt == 0 && s->fifo_len == 0) {
262 s->datactrl &= ~PL181_DATA_ENABLE;
263 DPRINTF("Data engine idle\n");
264 } else {
265
266 bits = PL181_STATUS_TXACTIVE | PL181_STATUS_RXACTIVE;
267 if (s->fifo_len == 0) {
268 bits |= PL181_STATUS_TXFIFOEMPTY;
269 bits |= PL181_STATUS_RXFIFOEMPTY;
270 } else {
271 bits |= PL181_STATUS_TXDATAAVLBL;
272 bits |= PL181_STATUS_RXDATAAVLBL;
273 }
274 if (s->fifo_len == 16) {
275 bits |= PL181_STATUS_TXFIFOFULL;
276 bits |= PL181_STATUS_RXFIFOFULL;
277 }
278 if (s->fifo_len <= 8) {
279 bits |= PL181_STATUS_TXFIFOHALFEMPTY;
280 }
281 if (s->fifo_len >= 8) {
282 bits |= PL181_STATUS_RXFIFOHALFFULL;
283 }
284 if (s->datactrl & PL181_DATA_DIRECTION) {
285 bits &= PL181_STATUS_RX_FIFO;
286 } else {
287 bits &= PL181_STATUS_TX_FIFO;
288 }
289 s->status |= bits;
290 }
291}
292
293static uint64_t pl181_read(void *opaque, hwaddr offset,
294 unsigned size)
295{
296 PL181State *s = (PL181State *)opaque;
297 uint32_t tmp;
298
299 if (offset >= 0xfe0 && offset < 0x1000) {
300 return pl181_id[(offset - 0xfe0) >> 2];
301 }
302 switch (offset) {
303 case 0x00:
304 return s->power;
305 case 0x04:
306 return s->clock;
307 case 0x08:
308 return s->cmdarg;
309 case 0x0c:
310 return s->cmd;
311 case 0x10:
312 return s->respcmd;
313 case 0x14:
314 return s->response[0];
315 case 0x18:
316 return s->response[1];
317 case 0x1c:
318 return s->response[2];
319 case 0x20:
320 return s->response[3];
321 case 0x24:
322 return s->datatimer;
323 case 0x28:
324 return s->datalength;
325 case 0x2c:
326 return s->datactrl;
327 case 0x30:
328 return s->datacnt;
329 case 0x34:
330 tmp = s->status;
331 if (s->linux_hack) {
332 s->linux_hack = 0;
333 pl181_fifo_run(s);
334 pl181_update(s);
335 }
336 return tmp;
337 case 0x3c:
338 return s->mask[0];
339 case 0x40:
340 return s->mask[1];
341 case 0x48:
342
343
344
345
346
347
348 tmp = (s->datacnt + 3) >> 2;
349 if (s->linux_hack) {
350 s->linux_hack = 0;
351 pl181_fifo_run(s);
352 pl181_update(s);
353 }
354 return tmp;
355 case 0x80: case 0x84: case 0x88: case 0x8c:
356 case 0x90: case 0x94: case 0x98: case 0x9c:
357 case 0xa0: case 0xa4: case 0xa8: case 0xac:
358 case 0xb0: case 0xb4: case 0xb8: case 0xbc:
359 if (s->fifo_len == 0) {
360 qemu_log_mask(LOG_GUEST_ERROR, "pl181: Unexpected FIFO read\n");
361 return 0;
362 } else {
363 uint32_t value;
364 value = pl181_fifo_pop(s);
365 s->linux_hack = 1;
366 pl181_fifo_run(s);
367 pl181_update(s);
368 return value;
369 }
370 default:
371 qemu_log_mask(LOG_GUEST_ERROR,
372 "pl181_read: Bad offset %x\n", (int)offset);
373 return 0;
374 }
375}
376
377static void pl181_write(void *opaque, hwaddr offset,
378 uint64_t value, unsigned size)
379{
380 PL181State *s = (PL181State *)opaque;
381
382 switch (offset) {
383 case 0x00:
384 s->power = value & 0xff;
385 break;
386 case 0x04:
387 s->clock = value & 0xff;
388 break;
389 case 0x08:
390 s->cmdarg = value;
391 break;
392 case 0x0c:
393 s->cmd = value;
394 if (s->cmd & PL181_CMD_ENABLE) {
395 if (s->cmd & PL181_CMD_INTERRUPT) {
396 qemu_log_mask(LOG_UNIMP,
397 "pl181: Interrupt mode not implemented\n");
398 } if (s->cmd & PL181_CMD_PENDING) {
399 qemu_log_mask(LOG_UNIMP,
400 "pl181: Pending commands not implemented\n");
401 } else {
402 pl181_send_command(s);
403 pl181_fifo_run(s);
404 }
405
406 s->cmd &= ~PL181_CMD_ENABLE;
407 }
408 break;
409 case 0x24:
410 s->datatimer = value;
411 break;
412 case 0x28:
413 s->datalength = value & 0xffff;
414 break;
415 case 0x2c:
416 s->datactrl = value & 0xff;
417 if (value & PL181_DATA_ENABLE) {
418 s->datacnt = s->datalength;
419 pl181_fifo_run(s);
420 }
421 break;
422 case 0x38:
423 s->status &= ~(value & 0x7ff);
424 break;
425 case 0x3c:
426 s->mask[0] = value;
427 break;
428 case 0x40:
429 s->mask[1] = value;
430 break;
431 case 0x80: case 0x84: case 0x88: case 0x8c:
432 case 0x90: case 0x94: case 0x98: case 0x9c:
433 case 0xa0: case 0xa4: case 0xa8: case 0xac:
434 case 0xb0: case 0xb4: case 0xb8: case 0xbc:
435 if (s->datacnt == 0) {
436 qemu_log_mask(LOG_GUEST_ERROR, "pl181: Unexpected FIFO write\n");
437 } else {
438 pl181_fifo_push(s, value);
439 pl181_fifo_run(s);
440 }
441 break;
442 default:
443 qemu_log_mask(LOG_GUEST_ERROR,
444 "pl181_write: Bad offset %x\n", (int)offset);
445 }
446 pl181_update(s);
447}
448
449static const MemoryRegionOps pl181_ops = {
450 .read = pl181_read,
451 .write = pl181_write,
452 .endianness = DEVICE_NATIVE_ENDIAN,
453};
454
455static void pl181_reset(DeviceState *d)
456{
457 PL181State *s = PL181(d);
458
459 s->power = 0;
460 s->cmdarg = 0;
461 s->cmd = 0;
462 s->datatimer = 0;
463 s->datalength = 0;
464 s->respcmd = 0;
465 s->response[0] = 0;
466 s->response[1] = 0;
467 s->response[2] = 0;
468 s->response[3] = 0;
469 s->datatimer = 0;
470 s->datalength = 0;
471 s->datactrl = 0;
472 s->datacnt = 0;
473 s->status = 0;
474 s->linux_hack = 0;
475 s->mask[0] = 0;
476 s->mask[1] = 0;
477
478
479 sd_set_cb(s->card, s->cardstatus[0], s->cardstatus[1]);
480
481
482
483 device_reset(DEVICE(s->card));
484}
485
486static void pl181_init(Object *obj)
487{
488 DeviceState *dev = DEVICE(obj);
489 PL181State *s = PL181(obj);
490 SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
491
492 memory_region_init_io(&s->iomem, obj, &pl181_ops, s, "pl181", 0x1000);
493 sysbus_init_mmio(sbd, &s->iomem);
494 sysbus_init_irq(sbd, &s->irq[0]);
495 sysbus_init_irq(sbd, &s->irq[1]);
496 qdev_init_gpio_out(dev, s->cardstatus, 2);
497}
498
499static void pl181_realize(DeviceState *dev, Error **errp)
500{
501 PL181State *s = PL181(dev);
502 DriveInfo *dinfo;
503
504
505 dinfo = drive_get_next(IF_SD);
506 s->card = sd_init(dinfo ? blk_by_legacy_dinfo(dinfo) : NULL, false);
507 if (s->card == NULL) {
508 error_setg(errp, "sd_init failed");
509 }
510}
511
512static void pl181_class_init(ObjectClass *klass, void *data)
513{
514 DeviceClass *k = DEVICE_CLASS(klass);
515
516 k->vmsd = &vmstate_pl181;
517 k->reset = pl181_reset;
518
519 k->user_creatable = false;
520 k->realize = pl181_realize;
521}
522
523static const TypeInfo pl181_info = {
524 .name = TYPE_PL181,
525 .parent = TYPE_SYS_BUS_DEVICE,
526 .instance_size = sizeof(PL181State),
527 .instance_init = pl181_init,
528 .class_init = pl181_class_init,
529};
530
531static void pl181_register_types(void)
532{
533 type_register_static(&pl181_info);
534}
535
536type_init(pl181_register_types)
537
