root / hw / pl181.c @ 81699d8a
History | View | Annotate | Download (13.7 kB)
1 |
/*
|
---|---|
2 |
* Arm PrimeCell PL181 MultiMedia Card Interface
|
3 |
*
|
4 |
* Copyright (c) 2007 CodeSourcery.
|
5 |
* Written by Paul Brook
|
6 |
*
|
7 |
* This code is licenced under the GPL.
|
8 |
*/
|
9 |
|
10 |
#include "sysbus.h" |
11 |
#include "sd.h" |
12 |
|
13 |
//#define DEBUG_PL181 1
|
14 |
|
15 |
#ifdef DEBUG_PL181
|
16 |
#define DPRINTF(fmt, ...) \
|
17 |
do { printf("pl181: " fmt , ## __VA_ARGS__); } while (0) |
18 |
#else
|
19 |
#define DPRINTF(fmt, ...) do {} while(0) |
20 |
#endif
|
21 |
|
22 |
#define PL181_FIFO_LEN 16 |
23 |
|
24 |
typedef struct { |
25 |
SysBusDevice busdev; |
26 |
SDState *card; |
27 |
uint32_t clock; |
28 |
uint32_t power; |
29 |
uint32_t cmdarg; |
30 |
uint32_t cmd; |
31 |
uint32_t datatimer; |
32 |
uint32_t datalength; |
33 |
uint32_t respcmd; |
34 |
uint32_t response[4];
|
35 |
uint32_t datactrl; |
36 |
uint32_t datacnt; |
37 |
uint32_t status; |
38 |
uint32_t mask[2];
|
39 |
int fifo_pos;
|
40 |
int fifo_len;
|
41 |
/* The linux 2.6.21 driver is buggy, and misbehaves if new data arrives
|
42 |
while it is reading the FIFO. We hack around this be defering
|
43 |
subsequent transfers until after the driver polls the status word.
|
44 |
http://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=4446/1
|
45 |
*/
|
46 |
int linux_hack;
|
47 |
uint32_t fifo[PL181_FIFO_LEN]; |
48 |
qemu_irq irq[2];
|
49 |
} pl181_state; |
50 |
|
51 |
#define PL181_CMD_INDEX 0x3f |
52 |
#define PL181_CMD_RESPONSE (1 << 6) |
53 |
#define PL181_CMD_LONGRESP (1 << 7) |
54 |
#define PL181_CMD_INTERRUPT (1 << 8) |
55 |
#define PL181_CMD_PENDING (1 << 9) |
56 |
#define PL181_CMD_ENABLE (1 << 10) |
57 |
|
58 |
#define PL181_DATA_ENABLE (1 << 0) |
59 |
#define PL181_DATA_DIRECTION (1 << 1) |
60 |
#define PL181_DATA_MODE (1 << 2) |
61 |
#define PL181_DATA_DMAENABLE (1 << 3) |
62 |
|
63 |
#define PL181_STATUS_CMDCRCFAIL (1 << 0) |
64 |
#define PL181_STATUS_DATACRCFAIL (1 << 1) |
65 |
#define PL181_STATUS_CMDTIMEOUT (1 << 2) |
66 |
#define PL181_STATUS_DATATIMEOUT (1 << 3) |
67 |
#define PL181_STATUS_TXUNDERRUN (1 << 4) |
68 |
#define PL181_STATUS_RXOVERRUN (1 << 5) |
69 |
#define PL181_STATUS_CMDRESPEND (1 << 6) |
70 |
#define PL181_STATUS_CMDSENT (1 << 7) |
71 |
#define PL181_STATUS_DATAEND (1 << 8) |
72 |
#define PL181_STATUS_DATABLOCKEND (1 << 10) |
73 |
#define PL181_STATUS_CMDACTIVE (1 << 11) |
74 |
#define PL181_STATUS_TXACTIVE (1 << 12) |
75 |
#define PL181_STATUS_RXACTIVE (1 << 13) |
76 |
#define PL181_STATUS_TXFIFOHALFEMPTY (1 << 14) |
77 |
#define PL181_STATUS_RXFIFOHALFFULL (1 << 15) |
78 |
#define PL181_STATUS_TXFIFOFULL (1 << 16) |
79 |
#define PL181_STATUS_RXFIFOFULL (1 << 17) |
80 |
#define PL181_STATUS_TXFIFOEMPTY (1 << 18) |
81 |
#define PL181_STATUS_RXFIFOEMPTY (1 << 19) |
82 |
#define PL181_STATUS_TXDATAAVLBL (1 << 20) |
83 |
#define PL181_STATUS_RXDATAAVLBL (1 << 21) |
84 |
|
85 |
#define PL181_STATUS_TX_FIFO (PL181_STATUS_TXACTIVE \
|
86 |
|PL181_STATUS_TXFIFOHALFEMPTY \ |
87 |
|PL181_STATUS_TXFIFOFULL \ |
88 |
|PL181_STATUS_TXFIFOEMPTY \ |
89 |
|PL181_STATUS_TXDATAAVLBL) |
90 |
#define PL181_STATUS_RX_FIFO (PL181_STATUS_RXACTIVE \
|
91 |
|PL181_STATUS_RXFIFOHALFFULL \ |
92 |
|PL181_STATUS_RXFIFOFULL \ |
93 |
|PL181_STATUS_RXFIFOEMPTY \ |
94 |
|PL181_STATUS_RXDATAAVLBL) |
95 |
|
96 |
static const unsigned char pl181_id[] = |
97 |
{ 0x81, 0x11, 0x04, 0x00, 0x0d, 0xf0, 0x05, 0xb1 }; |
98 |
|
99 |
static void pl181_update(pl181_state *s) |
100 |
{ |
101 |
int i;
|
102 |
for (i = 0; i < 2; i++) { |
103 |
qemu_set_irq(s->irq[i], (s->status & s->mask[i]) != 0);
|
104 |
} |
105 |
} |
106 |
|
107 |
static void pl181_fifo_push(pl181_state *s, uint32_t value) |
108 |
{ |
109 |
int n;
|
110 |
|
111 |
if (s->fifo_len == PL181_FIFO_LEN) {
|
112 |
fprintf(stderr, "pl181: FIFO overflow\n");
|
113 |
return;
|
114 |
} |
115 |
n = (s->fifo_pos + s->fifo_len) & (PL181_FIFO_LEN - 1);
|
116 |
s->fifo_len++; |
117 |
s->fifo[n] = value; |
118 |
DPRINTF("FIFO push %08x\n", (int)value); |
119 |
} |
120 |
|
121 |
static uint32_t pl181_fifo_pop(pl181_state *s)
|
122 |
{ |
123 |
uint32_t value; |
124 |
|
125 |
if (s->fifo_len == 0) { |
126 |
fprintf(stderr, "pl181: FIFO underflow\n");
|
127 |
return 0; |
128 |
} |
129 |
value = s->fifo[s->fifo_pos]; |
130 |
s->fifo_len--; |
131 |
s->fifo_pos = (s->fifo_pos + 1) & (PL181_FIFO_LEN - 1); |
132 |
DPRINTF("FIFO pop %08x\n", (int)value); |
133 |
return value;
|
134 |
} |
135 |
|
136 |
static void pl181_send_command(pl181_state *s) |
137 |
{ |
138 |
SDRequest request; |
139 |
uint8_t response[16];
|
140 |
int rlen;
|
141 |
|
142 |
request.cmd = s->cmd & PL181_CMD_INDEX; |
143 |
request.arg = s->cmdarg; |
144 |
DPRINTF("Command %d %08x\n", request.cmd, request.arg);
|
145 |
rlen = sd_do_command(s->card, &request, response); |
146 |
if (rlen < 0) |
147 |
goto error;
|
148 |
if (s->cmd & PL181_CMD_RESPONSE) {
|
149 |
#define RWORD(n) ((response[n] << 24) | (response[n + 1] << 16) \ |
150 |
| (response[n + 2] << 8) | response[n + 3]) |
151 |
if (rlen == 0 || (rlen == 4 && (s->cmd & PL181_CMD_LONGRESP))) |
152 |
goto error;
|
153 |
if (rlen != 4 && rlen != 16) |
154 |
goto error;
|
155 |
s->response[0] = RWORD(0); |
156 |
if (rlen == 4) { |
157 |
s->response[1] = s->response[2] = s->response[3] = 0; |
158 |
} else {
|
159 |
s->response[1] = RWORD(4); |
160 |
s->response[2] = RWORD(8); |
161 |
s->response[3] = RWORD(12) & ~1; |
162 |
} |
163 |
DPRINTF("Response received\n");
|
164 |
s->status |= PL181_STATUS_CMDRESPEND; |
165 |
#undef RWORD
|
166 |
} else {
|
167 |
DPRINTF("Command sent\n");
|
168 |
s->status |= PL181_STATUS_CMDSENT; |
169 |
} |
170 |
return;
|
171 |
|
172 |
error:
|
173 |
DPRINTF("Timeout\n");
|
174 |
s->status |= PL181_STATUS_CMDTIMEOUT; |
175 |
} |
176 |
|
177 |
/* Transfer data between the card and the FIFO. This is complicated by
|
178 |
the FIFO holding 32-bit words and the card taking data in single byte
|
179 |
chunks. FIFO bytes are transferred in little-endian order. */
|
180 |
|
181 |
static void pl181_fifo_run(pl181_state *s) |
182 |
{ |
183 |
uint32_t bits; |
184 |
uint32_t value = 0;
|
185 |
int n;
|
186 |
int is_read;
|
187 |
|
188 |
is_read = (s->datactrl & PL181_DATA_DIRECTION) != 0;
|
189 |
if (s->datacnt != 0 && (!is_read || sd_data_ready(s->card)) |
190 |
&& !s->linux_hack) { |
191 |
if (is_read) {
|
192 |
n = 0;
|
193 |
while (s->datacnt && s->fifo_len < PL181_FIFO_LEN) {
|
194 |
value |= (uint32_t)sd_read_data(s->card) << (n * 8);
|
195 |
s->datacnt--; |
196 |
n++; |
197 |
if (n == 4) { |
198 |
pl181_fifo_push(s, value); |
199 |
n = 0;
|
200 |
value = 0;
|
201 |
} |
202 |
} |
203 |
if (n != 0) { |
204 |
pl181_fifo_push(s, value); |
205 |
} |
206 |
} else { /* write */ |
207 |
n = 0;
|
208 |
while (s->datacnt > 0 && (s->fifo_len > 0 || n > 0)) { |
209 |
if (n == 0) { |
210 |
value = pl181_fifo_pop(s); |
211 |
n = 4;
|
212 |
} |
213 |
n--; |
214 |
s->datacnt--; |
215 |
sd_write_data(s->card, value & 0xff);
|
216 |
value >>= 8;
|
217 |
} |
218 |
} |
219 |
} |
220 |
s->status &= ~(PL181_STATUS_RX_FIFO | PL181_STATUS_TX_FIFO); |
221 |
if (s->datacnt == 0) { |
222 |
s->status |= PL181_STATUS_DATAEND; |
223 |
/* HACK: */
|
224 |
s->status |= PL181_STATUS_DATABLOCKEND; |
225 |
DPRINTF("Transfer Complete\n");
|
226 |
} |
227 |
if (s->datacnt == 0 && s->fifo_len == 0) { |
228 |
s->datactrl &= ~PL181_DATA_ENABLE; |
229 |
DPRINTF("Data engine idle\n");
|
230 |
} else {
|
231 |
/* Update FIFO bits. */
|
232 |
bits = PL181_STATUS_TXACTIVE | PL181_STATUS_RXACTIVE; |
233 |
if (s->fifo_len == 0) { |
234 |
bits |= PL181_STATUS_TXFIFOEMPTY; |
235 |
bits |= PL181_STATUS_RXFIFOEMPTY; |
236 |
} else {
|
237 |
bits |= PL181_STATUS_TXDATAAVLBL; |
238 |
bits |= PL181_STATUS_RXDATAAVLBL; |
239 |
} |
240 |
if (s->fifo_len == 16) { |
241 |
bits |= PL181_STATUS_TXFIFOFULL; |
242 |
bits |= PL181_STATUS_RXFIFOFULL; |
243 |
} |
244 |
if (s->fifo_len <= 8) { |
245 |
bits |= PL181_STATUS_TXFIFOHALFEMPTY; |
246 |
} |
247 |
if (s->fifo_len >= 8) { |
248 |
bits |= PL181_STATUS_RXFIFOHALFFULL; |
249 |
} |
250 |
if (s->datactrl & PL181_DATA_DIRECTION) {
|
251 |
bits &= PL181_STATUS_RX_FIFO; |
252 |
} else {
|
253 |
bits &= PL181_STATUS_TX_FIFO; |
254 |
} |
255 |
s->status |= bits; |
256 |
} |
257 |
} |
258 |
|
259 |
static uint32_t pl181_read(void *opaque, target_phys_addr_t offset) |
260 |
{ |
261 |
pl181_state *s = (pl181_state *)opaque; |
262 |
uint32_t tmp; |
263 |
|
264 |
if (offset >= 0xfe0 && offset < 0x1000) { |
265 |
return pl181_id[(offset - 0xfe0) >> 2]; |
266 |
} |
267 |
switch (offset) {
|
268 |
case 0x00: /* Power */ |
269 |
return s->power;
|
270 |
case 0x04: /* Clock */ |
271 |
return s->clock;
|
272 |
case 0x08: /* Argument */ |
273 |
return s->cmdarg;
|
274 |
case 0x0c: /* Command */ |
275 |
return s->cmd;
|
276 |
case 0x10: /* RespCmd */ |
277 |
return s->respcmd;
|
278 |
case 0x14: /* Response0 */ |
279 |
return s->response[0]; |
280 |
case 0x18: /* Response1 */ |
281 |
return s->response[1]; |
282 |
case 0x1c: /* Response2 */ |
283 |
return s->response[2]; |
284 |
case 0x20: /* Response3 */ |
285 |
return s->response[3]; |
286 |
case 0x24: /* DataTimer */ |
287 |
return s->datatimer;
|
288 |
case 0x28: /* DataLength */ |
289 |
return s->datalength;
|
290 |
case 0x2c: /* DataCtrl */ |
291 |
return s->datactrl;
|
292 |
case 0x30: /* DataCnt */ |
293 |
return s->datacnt;
|
294 |
case 0x34: /* Status */ |
295 |
tmp = s->status; |
296 |
if (s->linux_hack) {
|
297 |
s->linux_hack = 0;
|
298 |
pl181_fifo_run(s); |
299 |
pl181_update(s); |
300 |
} |
301 |
return tmp;
|
302 |
case 0x3c: /* Mask0 */ |
303 |
return s->mask[0]; |
304 |
case 0x40: /* Mask1 */ |
305 |
return s->mask[1]; |
306 |
case 0x48: /* FifoCnt */ |
307 |
/* The documentation is somewhat vague about exactly what FifoCnt
|
308 |
does. On real hardware it appears to be when decrememnted
|
309 |
when a word is transfered between the FIFO and the serial
|
310 |
data engine. DataCnt is decremented after each byte is
|
311 |
transfered between the serial engine and the card.
|
312 |
We don't emulate this level of detail, so both can be the same. */
|
313 |
tmp = (s->datacnt + 3) >> 2; |
314 |
if (s->linux_hack) {
|
315 |
s->linux_hack = 0;
|
316 |
pl181_fifo_run(s); |
317 |
pl181_update(s); |
318 |
} |
319 |
return tmp;
|
320 |
case 0x80: case 0x84: case 0x88: case 0x8c: /* FifoData */ |
321 |
case 0x90: case 0x94: case 0x98: case 0x9c: |
322 |
case 0xa0: case 0xa4: case 0xa8: case 0xac: |
323 |
case 0xb0: case 0xb4: case 0xb8: case 0xbc: |
324 |
if (s->fifo_len == 0) { |
325 |
fprintf(stderr, "pl181: Unexpected FIFO read\n");
|
326 |
return 0; |
327 |
} else {
|
328 |
uint32_t value; |
329 |
value = pl181_fifo_pop(s); |
330 |
s->linux_hack = 1;
|
331 |
pl181_fifo_run(s); |
332 |
pl181_update(s); |
333 |
return value;
|
334 |
} |
335 |
default:
|
336 |
hw_error("pl181_read: Bad offset %x\n", (int)offset); |
337 |
return 0; |
338 |
} |
339 |
} |
340 |
|
341 |
static void pl181_write(void *opaque, target_phys_addr_t offset, |
342 |
uint32_t value) |
343 |
{ |
344 |
pl181_state *s = (pl181_state *)opaque; |
345 |
|
346 |
switch (offset) {
|
347 |
case 0x00: /* Power */ |
348 |
s->power = value & 0xff;
|
349 |
break;
|
350 |
case 0x04: /* Clock */ |
351 |
s->clock = value & 0xff;
|
352 |
break;
|
353 |
case 0x08: /* Argument */ |
354 |
s->cmdarg = value; |
355 |
break;
|
356 |
case 0x0c: /* Command */ |
357 |
s->cmd = value; |
358 |
if (s->cmd & PL181_CMD_ENABLE) {
|
359 |
if (s->cmd & PL181_CMD_INTERRUPT) {
|
360 |
fprintf(stderr, "pl181: Interrupt mode not implemented\n");
|
361 |
abort(); |
362 |
} if (s->cmd & PL181_CMD_PENDING) {
|
363 |
fprintf(stderr, "pl181: Pending commands not implemented\n");
|
364 |
abort(); |
365 |
} else {
|
366 |
pl181_send_command(s); |
367 |
pl181_fifo_run(s); |
368 |
} |
369 |
/* The command has completed one way or the other. */
|
370 |
s->cmd &= ~PL181_CMD_ENABLE; |
371 |
} |
372 |
break;
|
373 |
case 0x24: /* DataTimer */ |
374 |
s->datatimer = value; |
375 |
break;
|
376 |
case 0x28: /* DataLength */ |
377 |
s->datalength = value & 0xffff;
|
378 |
break;
|
379 |
case 0x2c: /* DataCtrl */ |
380 |
s->datactrl = value & 0xff;
|
381 |
if (value & PL181_DATA_ENABLE) {
|
382 |
s->datacnt = s->datalength; |
383 |
pl181_fifo_run(s); |
384 |
} |
385 |
break;
|
386 |
case 0x38: /* Clear */ |
387 |
s->status &= ~(value & 0x7ff);
|
388 |
break;
|
389 |
case 0x3c: /* Mask0 */ |
390 |
s->mask[0] = value;
|
391 |
break;
|
392 |
case 0x40: /* Mask1 */ |
393 |
s->mask[1] = value;
|
394 |
break;
|
395 |
case 0x80: case 0x84: case 0x88: case 0x8c: /* FifoData */ |
396 |
case 0x90: case 0x94: case 0x98: case 0x9c: |
397 |
case 0xa0: case 0xa4: case 0xa8: case 0xac: |
398 |
case 0xb0: case 0xb4: case 0xb8: case 0xbc: |
399 |
if (s->datacnt == 0) { |
400 |
fprintf(stderr, "pl181: Unexpected FIFO write\n");
|
401 |
} else {
|
402 |
pl181_fifo_push(s, value); |
403 |
pl181_fifo_run(s); |
404 |
} |
405 |
break;
|
406 |
default:
|
407 |
hw_error("pl181_write: Bad offset %x\n", (int)offset); |
408 |
} |
409 |
pl181_update(s); |
410 |
} |
411 |
|
412 |
static CPUReadMemoryFunc * const pl181_readfn[] = { |
413 |
pl181_read, |
414 |
pl181_read, |
415 |
pl181_read |
416 |
}; |
417 |
|
418 |
static CPUWriteMemoryFunc * const pl181_writefn[] = { |
419 |
pl181_write, |
420 |
pl181_write, |
421 |
pl181_write |
422 |
}; |
423 |
|
424 |
static void pl181_reset(void *opaque) |
425 |
{ |
426 |
pl181_state *s = (pl181_state *)opaque; |
427 |
|
428 |
s->power = 0;
|
429 |
s->cmdarg = 0;
|
430 |
s->cmd = 0;
|
431 |
s->datatimer = 0;
|
432 |
s->datalength = 0;
|
433 |
s->respcmd = 0;
|
434 |
s->response[0] = 0; |
435 |
s->response[1] = 0; |
436 |
s->response[2] = 0; |
437 |
s->response[3] = 0; |
438 |
s->datatimer = 0;
|
439 |
s->datalength = 0;
|
440 |
s->datactrl = 0;
|
441 |
s->datacnt = 0;
|
442 |
s->status = 0;
|
443 |
s->linux_hack = 0;
|
444 |
s->mask[0] = 0; |
445 |
s->mask[1] = 0; |
446 |
} |
447 |
|
448 |
static int pl181_init(SysBusDevice *dev) |
449 |
{ |
450 |
int iomemtype;
|
451 |
pl181_state *s = FROM_SYSBUS(pl181_state, dev); |
452 |
BlockDriverState *bd; |
453 |
|
454 |
iomemtype = cpu_register_io_memory(pl181_readfn, |
455 |
pl181_writefn, s); |
456 |
sysbus_init_mmio(dev, 0x1000, iomemtype);
|
457 |
sysbus_init_irq(dev, &s->irq[0]);
|
458 |
sysbus_init_irq(dev, &s->irq[1]);
|
459 |
bd = qdev_init_bdrv(&dev->qdev, IF_SD); |
460 |
s->card = sd_init(bd, 0);
|
461 |
qemu_register_reset(pl181_reset, s); |
462 |
pl181_reset(s); |
463 |
/* ??? Save/restore. */
|
464 |
return 0; |
465 |
} |
466 |
|
467 |
static void pl181_register_devices(void) |
468 |
{ |
469 |
sysbus_register_dev("pl181", sizeof(pl181_state), pl181_init); |
470 |
} |
471 |
|
472 |
device_init(pl181_register_devices) |