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Merge branch 'master' of git://git2.kernel.org/pub/scm/linux/kernel/git/torvalds...
[linux-2.6/linux-2.6-openrd.git] / drivers / video / msm / mddi.c
blob474421fe79a646dfa98d04ad28c72930061575a5
1 /*
2 * MSM MDDI Transport
3 *
4 * Copyright (C) 2007 Google Incorporated
5 * Copyright (C) 2007 QUALCOMM Incorporated
6 *
7 * This software is licensed under the terms of the GNU General Public
8 * License version 2, as published by the Free Software Foundation, and
9 * may be copied, distributed, and modified under those terms.
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 */
17
18 #include <linux/module.h>
19 #include <linux/kernel.h>
20 #include <linux/dma-mapping.h>
21 #include <linux/interrupt.h>
22 #include <linux/platform_device.h>
23 #include <linux/delay.h>
24 #include <linux/spinlock.h>
25 #include <linux/clk.h>
26 #include <linux/io.h>
27 #include <linux/sched.h>
28 #include <mach/msm_iomap.h>
29 #include <mach/irqs.h>
30 #include <mach/board.h>
31 #include <mach/msm_fb.h>
32 #include "mddi_hw.h"
33
34 #define FLAG_DISABLE_HIBERNATION 0x0001
35 #define FLAG_HAVE_CAPS 0x0002
36 #define FLAG_HAS_VSYNC_IRQ 0x0004
37 #define FLAG_HAVE_STATUS 0x0008
38
39 #define CMD_GET_CLIENT_CAP 0x0601
40 #define CMD_GET_CLIENT_STATUS 0x0602
41
42 union mddi_rev {
43 unsigned char raw[MDDI_REV_BUFFER_SIZE];
44 struct mddi_rev_packet hdr;
45 struct mddi_client_status status;
46 struct mddi_client_caps caps;
47 struct mddi_register_access reg;
48 };
49
50 struct reg_read_info {
51 struct completion done;
52 uint32_t reg;
53 uint32_t status;
54 uint32_t result;
55 };
56
57 struct mddi_info {
58 uint16_t flags;
59 uint16_t version;
60 char __iomem *base;
61 int irq;
62 struct clk *clk;
63 struct msm_mddi_client_data client_data;
64
65 /* buffer for rev encap packets */
66 void *rev_data;
67 dma_addr_t rev_addr;
68 struct mddi_llentry *reg_write_data;
69 dma_addr_t reg_write_addr;
70 struct mddi_llentry *reg_read_data;
71 dma_addr_t reg_read_addr;
72 size_t rev_data_curr;
73
74 spinlock_t int_lock;
75 uint32_t int_enable;
76 uint32_t got_int;
77 wait_queue_head_t int_wait;
78
79 struct mutex reg_write_lock;
80 struct mutex reg_read_lock;
81 struct reg_read_info *reg_read;
82
83 struct mddi_client_caps caps;
84 struct mddi_client_status status;
85
86 void (*power_client)(struct msm_mddi_client_data *, int);
87
88 /* client device published to bind us to the
89 * appropriate mddi_client driver
90 */
91 char client_name[20];
92
93 struct platform_device client_pdev;
94 };
95
96 static void mddi_init_rev_encap(struct mddi_info *mddi);
97
98 #define mddi_readl(r) readl(mddi->base + (MDDI_##r))
99 #define mddi_writel(v, r) writel((v), mddi->base + (MDDI_##r))
100
101 void mddi_activate_link(struct msm_mddi_client_data *cdata)
102 {
103 struct mddi_info *mddi = container_of(cdata, struct mddi_info,
104 client_data);
105
106 mddi_writel(MDDI_CMD_LINK_ACTIVE, CMD);
107 }
108
109 static void mddi_handle_link_list_done(struct mddi_info *mddi)
110 {
111 }
112
113 static void mddi_reset_rev_encap_ptr(struct mddi_info *mddi)
114 {
115 printk(KERN_INFO "mddi: resetting rev ptr\n");
116 mddi->rev_data_curr = 0;
117 mddi_writel(mddi->rev_addr, REV_PTR);
118 mddi_writel(mddi->rev_addr, REV_PTR);
119 mddi_writel(MDDI_CMD_FORCE_NEW_REV_PTR, CMD);
120 }
121
122 static void mddi_handle_rev_data(struct mddi_info *mddi, union mddi_rev *rev)
123 {
124 int i;
125 struct reg_read_info *ri;
126
127 if ((rev->hdr.length <= MDDI_REV_BUFFER_SIZE - 2) &&
128 (rev->hdr.length >= sizeof(struct mddi_rev_packet) - 2)) {
129
130 switch (rev->hdr.type) {
131 case TYPE_CLIENT_CAPS:
132 memcpy(&mddi->caps, &rev->caps,
133 sizeof(struct mddi_client_caps));
134 mddi->flags |= FLAG_HAVE_CAPS;
135 wake_up(&mddi->int_wait);
136 break;
137 case TYPE_CLIENT_STATUS:
138 memcpy(&mddi->status, &rev->status,
139 sizeof(struct mddi_client_status));
140 mddi->flags |= FLAG_HAVE_STATUS;
141 wake_up(&mddi->int_wait);
142 break;
143 case TYPE_REGISTER_ACCESS:
144 ri = mddi->reg_read;
145 if (ri == 0) {
146 printk(KERN_INFO "rev: got reg %x = %x without "
147 " pending read\n",
148 rev->reg.register_address,
149 rev->reg.register_data_list);
150 break;
151 }
152 if (ri->reg != rev->reg.register_address) {
153 printk(KERN_INFO "rev: got reg %x = %x for "
154 "wrong register, expected "
155 "%x\n",
156 rev->reg.register_address,
157 rev->reg.register_data_list, ri->reg);
158 break;
159 }
160 mddi->reg_read = NULL;
161 ri->status = 0;
162 ri->result = rev->reg.register_data_list;
163 complete(&ri->done);
164 break;
165 default:
166 printk(KERN_INFO "rev: unknown reverse packet: "
167 "len=%04x type=%04x CURR_REV_PTR=%x\n",
168 rev->hdr.length, rev->hdr.type,
169 mddi_readl(CURR_REV_PTR));
170 for (i = 0; i < rev->hdr.length + 2; i++) {
171 if ((i % 16) == 0)
172 printk(KERN_INFO "\n");
173 printk(KERN_INFO " %02x", rev->raw[i]);
174 }
175 printk(KERN_INFO "\n");
176 mddi_reset_rev_encap_ptr(mddi);
177 }
178 } else {
179 printk(KERN_INFO "bad rev length, %d, CURR_REV_PTR %x\n",
180 rev->hdr.length, mddi_readl(CURR_REV_PTR));
181 mddi_reset_rev_encap_ptr(mddi);
182 }
183 }
184
185 static void mddi_wait_interrupt(struct mddi_info *mddi, uint32_t intmask);
186
187 static void mddi_handle_rev_data_avail(struct mddi_info *mddi)
188 {
189 union mddi_rev *rev = mddi->rev_data;
190 uint32_t rev_data_count;
191 uint32_t rev_crc_err_count;
192 int i;
193 struct reg_read_info *ri;
194 size_t prev_offset;
195 uint16_t length;
196
197 union mddi_rev *crev = mddi->rev_data + mddi->rev_data_curr;
198
199 /* clear the interrupt */
200 mddi_writel(MDDI_INT_REV_DATA_AVAIL, INT);
201 rev_data_count = mddi_readl(REV_PKT_CNT);
202 rev_crc_err_count = mddi_readl(REV_CRC_ERR);
203 if (rev_data_count > 1)
204 printk(KERN_INFO "rev_data_count %d\n", rev_data_count);
205
206 if (rev_crc_err_count) {
207 printk(KERN_INFO "rev_crc_err_count %d, INT %x\n",
208 rev_crc_err_count, mddi_readl(INT));
209 ri = mddi->reg_read;
210 if (ri == 0) {
211 printk(KERN_INFO "rev: got crc error without pending "
212 "read\n");
213 } else {
214 mddi->reg_read = NULL;
215 ri->status = -EIO;
216 ri->result = -1;
217 complete(&ri->done);
218 }
219 }
220
221 if (rev_data_count == 0)
222 return;
223
224 prev_offset = mddi->rev_data_curr;
225
226 length = *((uint8_t *)mddi->rev_data + mddi->rev_data_curr);
227 mddi->rev_data_curr++;
228 if (mddi->rev_data_curr == MDDI_REV_BUFFER_SIZE)
229 mddi->rev_data_curr = 0;
230 length += *((uint8_t *)mddi->rev_data + mddi->rev_data_curr) << 8;
231 mddi->rev_data_curr += 1 + length;
232 if (mddi->rev_data_curr >= MDDI_REV_BUFFER_SIZE)
233 mddi->rev_data_curr =
234 mddi->rev_data_curr % MDDI_REV_BUFFER_SIZE;
235
236 if (length > MDDI_REV_BUFFER_SIZE - 2) {
237 printk(KERN_INFO "mddi: rev data length greater than buffer"
238 "size\n");
239 mddi_reset_rev_encap_ptr(mddi);
240 return;
241 }
242
243 if (prev_offset + 2 + length >= MDDI_REV_BUFFER_SIZE) {
244 union mddi_rev tmprev;
245 size_t rem = MDDI_REV_BUFFER_SIZE - prev_offset;
246 memcpy(&tmprev.raw[0], mddi->rev_data + prev_offset, rem);
247 memcpy(&tmprev.raw[rem], mddi->rev_data, 2 + length - rem);
248 mddi_handle_rev_data(mddi, &tmprev);
249 } else {
250 mddi_handle_rev_data(mddi, crev);
251 }
252
253 if (prev_offset < MDDI_REV_BUFFER_SIZE / 2 &&
254 mddi->rev_data_curr >= MDDI_REV_BUFFER_SIZE / 2) {
255 mddi_writel(mddi->rev_addr, REV_PTR);
256 }
257 }
258
259 static irqreturn_t mddi_isr(int irq, void *data)
260 {
261 struct msm_mddi_client_data *cdata = data;
262 struct mddi_info *mddi = container_of(cdata, struct mddi_info,
263 client_data);
264 uint32_t active, status;
265
266 spin_lock(&mddi->int_lock);
267
268 active = mddi_readl(INT);
269 status = mddi_readl(STAT);
270
271 mddi_writel(active, INT);
272
273 /* ignore any interrupts we have disabled */
274 active &= mddi->int_enable;
275
276 mddi->got_int |= active;
277 wake_up(&mddi->int_wait);
278
279 if (active & MDDI_INT_PRI_LINK_LIST_DONE) {
280 mddi->int_enable &= (~MDDI_INT_PRI_LINK_LIST_DONE);
281 mddi_handle_link_list_done(mddi);
282 }
283 if (active & MDDI_INT_REV_DATA_AVAIL)
284 mddi_handle_rev_data_avail(mddi);
285
286 if (active & ~MDDI_INT_NEED_CLEAR)
287 mddi->int_enable &= ~(active & ~MDDI_INT_NEED_CLEAR);
288
289 if (active & MDDI_INT_LINK_ACTIVE) {
290 mddi->int_enable &= (~MDDI_INT_LINK_ACTIVE);
291 mddi->int_enable |= MDDI_INT_IN_HIBERNATION;
292 }
293
294 if (active & MDDI_INT_IN_HIBERNATION) {
295 mddi->int_enable &= (~MDDI_INT_IN_HIBERNATION);
296 mddi->int_enable |= MDDI_INT_LINK_ACTIVE;
297 }
298
299 mddi_writel(mddi->int_enable, INTEN);
300 spin_unlock(&mddi->int_lock);
301
302 return IRQ_HANDLED;
303 }
304
305 static long mddi_wait_interrupt_timeout(struct mddi_info *mddi,
306 uint32_t intmask, int timeout)
307 {
308 unsigned long irq_flags;
309
310 spin_lock_irqsave(&mddi->int_lock, irq_flags);
311 mddi->got_int &= ~intmask;
312 mddi->int_enable |= intmask;
313 mddi_writel(mddi->int_enable, INTEN);
314 spin_unlock_irqrestore(&mddi->int_lock, irq_flags);
315 return wait_event_timeout(mddi->int_wait, mddi->got_int & intmask,
316 timeout);
317 }
318
319 static void mddi_wait_interrupt(struct mddi_info *mddi, uint32_t intmask)
320 {
321 if (mddi_wait_interrupt_timeout(mddi, intmask, HZ/10) == 0)
322 printk(KERN_INFO KERN_ERR "mddi_wait_interrupt %d, timeout "
323 "waiting for %x, INT = %x, STAT = %x gotint = %x\n",
324 current->pid, intmask, mddi_readl(INT), mddi_readl(STAT),
325 mddi->got_int);
326 }
327
328 static void mddi_init_rev_encap(struct mddi_info *mddi)
329 {
330 memset(mddi->rev_data, 0xee, MDDI_REV_BUFFER_SIZE);
331 mddi_writel(mddi->rev_addr, REV_PTR);
332 mddi_writel(MDDI_CMD_FORCE_NEW_REV_PTR, CMD);
333 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
334 }
335
336 void mddi_set_auto_hibernate(struct msm_mddi_client_data *cdata, int on)
337 {
338 struct mddi_info *mddi = container_of(cdata, struct mddi_info,
339 client_data);
340 mddi_writel(MDDI_CMD_POWERDOWN, CMD);
341 mddi_wait_interrupt(mddi, MDDI_INT_IN_HIBERNATION);
342 mddi_writel(MDDI_CMD_HIBERNATE | !!on, CMD);
343 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
344 }
345
346
347 static uint16_t mddi_init_registers(struct mddi_info *mddi)
348 {
349 mddi_writel(0x0001, VERSION);
350 mddi_writel(MDDI_HOST_BYTES_PER_SUBFRAME, BPS);
351 mddi_writel(0x0003, SPM); /* subframes per media */
352 mddi_writel(0x0005, TA1_LEN);
353 mddi_writel(MDDI_HOST_TA2_LEN, TA2_LEN);
354 mddi_writel(0x0096, DRIVE_HI);
355 /* 0x32 normal, 0x50 for Toshiba display */
356 mddi_writel(0x0050, DRIVE_LO);
357 mddi_writel(0x003C, DISP_WAKE); /* wakeup counter */
358 mddi_writel(MDDI_HOST_REV_RATE_DIV, REV_RATE_DIV);
359
360 mddi_writel(MDDI_REV_BUFFER_SIZE, REV_SIZE);
361 mddi_writel(MDDI_MAX_REV_PKT_SIZE, REV_ENCAP_SZ);
362
363 /* disable periodic rev encap */
364 mddi_writel(MDDI_CMD_PERIODIC_REV_ENCAP, CMD);
365 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
366
367 if (mddi_readl(PAD_CTL) == 0) {
368 /* If we are turning on band gap, need to wait 5us before
369 * turning on the rest of the PAD */
370 mddi_writel(0x08000, PAD_CTL);
371 udelay(5);
372 }
373
374 /* Recommendation from PAD hw team */
375 mddi_writel(0xa850f, PAD_CTL);
376
377
378 /* Need an even number for counts */
379 mddi_writel(0x60006, DRIVER_START_CNT);
380
381 mddi_set_auto_hibernate(&mddi->client_data, 0);
382
383 mddi_writel(MDDI_CMD_DISP_IGNORE, CMD);
384 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
385
386 mddi_init_rev_encap(mddi);
387 return mddi_readl(CORE_VER) & 0xffff;
388 }
389
390 static void mddi_suspend(struct msm_mddi_client_data *cdata)
391 {
392 struct mddi_info *mddi = container_of(cdata, struct mddi_info,
393 client_data);
394 /* turn off the client */
395 if (mddi->power_client)
396 mddi->power_client(&mddi->client_data, 0);
397 /* turn off the link */
398 mddi_writel(MDDI_CMD_RESET, CMD);
399 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
400 /* turn off the clock */
401 clk_disable(mddi->clk);
402 }
403
404 static void mddi_resume(struct msm_mddi_client_data *cdata)
405 {
406 struct mddi_info *mddi = container_of(cdata, struct mddi_info,
407 client_data);
408 mddi_set_auto_hibernate(&mddi->client_data, 0);
409 /* turn on the client */
410 if (mddi->power_client)
411 mddi->power_client(&mddi->client_data, 1);
412 /* turn on the clock */
413 clk_enable(mddi->clk);
414 /* set up the local registers */
415 mddi->rev_data_curr = 0;
416 mddi_init_registers(mddi);
417 mddi_writel(mddi->int_enable, INTEN);
418 mddi_writel(MDDI_CMD_LINK_ACTIVE, CMD);
419 mddi_writel(MDDI_CMD_SEND_RTD, CMD);
420 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
421 mddi_set_auto_hibernate(&mddi->client_data, 1);
422 }
423
424 static int __init mddi_get_client_caps(struct mddi_info *mddi)
425 {
426 int i, j;
427
428 /* clear any stale interrupts */
429 mddi_writel(0xffffffff, INT);
430
431 mddi->int_enable = MDDI_INT_LINK_ACTIVE |
432 MDDI_INT_IN_HIBERNATION |
433 MDDI_INT_PRI_LINK_LIST_DONE |
434 MDDI_INT_REV_DATA_AVAIL |
435 MDDI_INT_REV_OVERFLOW |
436 MDDI_INT_REV_OVERWRITE |
437 MDDI_INT_RTD_FAILURE;
438 mddi_writel(mddi->int_enable, INTEN);
439
440 mddi_writel(MDDI_CMD_LINK_ACTIVE, CMD);
441 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
442
443 for (j = 0; j < 3; j++) {
444 /* the toshiba vga panel does not respond to get
445 * caps unless you SEND_RTD, but the first SEND_RTD
446 * will fail...
447 */
448 for (i = 0; i < 4; i++) {
449 uint32_t stat;
450
451 mddi_writel(MDDI_CMD_SEND_RTD, CMD);
452 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
453 stat = mddi_readl(STAT);
454 printk(KERN_INFO "mddi cmd send rtd: int %x, stat %x, "
455 "rtd val %x\n", mddi_readl(INT), stat,
456 mddi_readl(RTD_VAL));
457 if ((stat & MDDI_STAT_RTD_MEAS_FAIL) == 0)
458 break;
459 msleep(1);
460 }
461
462 mddi_writel(CMD_GET_CLIENT_CAP, CMD);
463 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
464 wait_event_timeout(mddi->int_wait, mddi->flags & FLAG_HAVE_CAPS,
465 HZ / 100);
466
467 if (mddi->flags & FLAG_HAVE_CAPS)
468 break;
469 printk(KERN_INFO KERN_ERR "mddi_init, timeout waiting for "
470 "caps\n");
471 }
472 return mddi->flags & FLAG_HAVE_CAPS;
473 }
474
475 /* link must be active when this is called */
476 int mddi_check_status(struct mddi_info *mddi)
477 {
478 int ret = -1, retry = 3;
479 mutex_lock(&mddi->reg_read_lock);
480 mddi_writel(MDDI_CMD_PERIODIC_REV_ENCAP | 1, CMD);
481 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
482
483 do {
484 mddi->flags &= ~FLAG_HAVE_STATUS;
485 mddi_writel(CMD_GET_CLIENT_STATUS, CMD);
486 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
487 wait_event_timeout(mddi->int_wait,
488 mddi->flags & FLAG_HAVE_STATUS,
489 HZ / 100);
490
491 if (mddi->flags & FLAG_HAVE_STATUS) {
492 if (mddi->status.crc_error_count)
493 printk(KERN_INFO "mddi status: crc_error "
494 "count: %d\n",
495 mddi->status.crc_error_count);
496 else
497 ret = 0;
498 break;
499 } else
500 printk(KERN_INFO "mddi status: failed to get client "
501 "status\n");
502 mddi_writel(MDDI_CMD_SEND_RTD, CMD);
503 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
504 } while (--retry);
505
506 mddi_writel(MDDI_CMD_PERIODIC_REV_ENCAP | 0, CMD);
507 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
508 mutex_unlock(&mddi->reg_read_lock);
509 return ret;
510 }
511
512
513 void mddi_remote_write(struct msm_mddi_client_data *cdata, uint32_t val,
514 uint32_t reg)
515 {
516 struct mddi_info *mddi = container_of(cdata, struct mddi_info,
517 client_data);
518 struct mddi_llentry *ll;
519 struct mddi_register_access *ra;
520
521 mutex_lock(&mddi->reg_write_lock);
522
523 ll = mddi->reg_write_data;
524
525 ra = &(ll->u.r);
526 ra->length = 14 + 4;
527 ra->type = TYPE_REGISTER_ACCESS;
528 ra->client_id = 0;
529 ra->read_write_info = MDDI_WRITE | 1;
530 ra->crc16 = 0;
531
532 ra->register_address = reg;
533 ra->register_data_list = val;
534
535 ll->flags = 1;
536 ll->header_count = 14;
537 ll->data_count = 4;
538 ll->data = mddi->reg_write_addr + offsetof(struct mddi_llentry,
539 u.r.register_data_list);
540 ll->next = 0;
541 ll->reserved = 0;
542
543 mddi_writel(mddi->reg_write_addr, PRI_PTR);
544
545 mddi_wait_interrupt(mddi, MDDI_INT_PRI_LINK_LIST_DONE);
546 mutex_unlock(&mddi->reg_write_lock);
547 }
548
549 uint32_t mddi_remote_read(struct msm_mddi_client_data *cdata, uint32_t reg)
550 {
551 struct mddi_info *mddi = container_of(cdata, struct mddi_info,
552 client_data);
553 struct mddi_llentry *ll;
554 struct mddi_register_access *ra;
555 struct reg_read_info ri;
556 unsigned s;
557 int retry_count = 2;
558 unsigned long irq_flags;
559
560 mutex_lock(&mddi->reg_read_lock);
561
562 ll = mddi->reg_read_data;
563
564 ra = &(ll->u.r);
565 ra->length = 14;
566 ra->type = TYPE_REGISTER_ACCESS;
567 ra->client_id = 0;
568 ra->read_write_info = MDDI_READ | 1;
569 ra->crc16 = 0;
570
571 ra->register_address = reg;
572
573 ll->flags = 0x11;
574 ll->header_count = 14;
575 ll->data_count = 0;
576 ll->data = 0;
577 ll->next = 0;
578 ll->reserved = 0;
579
580 s = mddi_readl(STAT);
581
582 ri.reg = reg;
583 ri.status = -1;
584
585 do {
586 init_completion(&ri.done);
587 mddi->reg_read = &ri;
588 mddi_writel(mddi->reg_read_addr, PRI_PTR);
589
590 mddi_wait_interrupt(mddi, MDDI_INT_PRI_LINK_LIST_DONE);
591
592 /* Enable Periodic Reverse Encapsulation. */
593 mddi_writel(MDDI_CMD_PERIODIC_REV_ENCAP | 1, CMD);
594 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
595 if (wait_for_completion_timeout(&ri.done, HZ/10) == 0 &&
596 !ri.done.done) {
597 printk(KERN_INFO "mddi_remote_read(%x) timeout "
598 "(%d %d %d)\n",
599 reg, ri.status, ri.result, ri.done.done);
600 spin_lock_irqsave(&mddi->int_lock, irq_flags);
601 mddi->reg_read = NULL;
602 spin_unlock_irqrestore(&mddi->int_lock, irq_flags);
603 ri.status = -1;
604 ri.result = -1;
605 }
606 if (ri.status == 0)
607 break;
608
609 mddi_writel(MDDI_CMD_SEND_RTD, CMD);
610 mddi_writel(MDDI_CMD_LINK_ACTIVE, CMD);
611 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
612 printk(KERN_INFO "mddi_remote_read: failed, sent "
613 "MDDI_CMD_SEND_RTD: int %x, stat %x, rtd val %x "
614 "curr_rev_ptr %x\n", mddi_readl(INT), mddi_readl(STAT),
615 mddi_readl(RTD_VAL), mddi_readl(CURR_REV_PTR));
616 } while (retry_count-- > 0);
617 /* Disable Periodic Reverse Encapsulation. */
618 mddi_writel(MDDI_CMD_PERIODIC_REV_ENCAP | 0, CMD);
619 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
620 mddi->reg_read = NULL;
621 mutex_unlock(&mddi->reg_read_lock);
622 return ri.result;
623 }
624
625 static struct mddi_info mddi_info[2];
626
627 static int __init mddi_clk_setup(struct platform_device *pdev,
628 struct mddi_info *mddi,
629 unsigned long clk_rate)
630 {
631 int ret;
632
633 /* set up the clocks */
634 mddi->clk = clk_get(&pdev->dev, "mddi_clk");
635 if (IS_ERR(mddi->clk)) {
636 printk(KERN_INFO "mddi: failed to get clock\n");
637 return PTR_ERR(mddi->clk);
638 }
639 ret = clk_enable(mddi->clk);
640 if (ret)
641 goto fail;
642 ret = clk_set_rate(mddi->clk, clk_rate);
643 if (ret)
644 goto fail;
645 return 0;
646
647 fail:
648 clk_put(mddi->clk);
649 return ret;
650 }
651
652 static int __init mddi_rev_data_setup(struct mddi_info *mddi)
653 {
654 void *dma;
655 dma_addr_t dma_addr;
656
657 /* set up dma buffer */
658 dma = dma_alloc_coherent(NULL, 0x1000, &dma_addr, GFP_KERNEL);
659 if (dma == 0)
660 return -ENOMEM;
661 mddi->rev_data = dma;
662 mddi->rev_data_curr = 0;
663 mddi->rev_addr = dma_addr;
664 mddi->reg_write_data = dma + MDDI_REV_BUFFER_SIZE;
665 mddi->reg_write_addr = dma_addr + MDDI_REV_BUFFER_SIZE;
666 mddi->reg_read_data = mddi->reg_write_data + 1;
667 mddi->reg_read_addr = mddi->reg_write_addr +
668 sizeof(*mddi->reg_write_data);
669 return 0;
670 }
671
672 static int __init mddi_probe(struct platform_device *pdev)
673 {
674 struct msm_mddi_platform_data *pdata = pdev->dev.platform_data;
675 struct mddi_info *mddi = &mddi_info[pdev->id];
676 struct resource *resource;
677 int ret, i;
678
679 resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
680 if (!resource) {
681 printk(KERN_ERR "mddi: no associated mem resource!\n");
682 return -ENOMEM;
683 }
684 mddi->base = ioremap(resource->start, resource->end - resource->start);
685 if (!mddi->base) {
686 printk(KERN_ERR "mddi: failed to remap base!\n");
687 ret = -EINVAL;
688 goto error_ioremap;
689 }
690 resource = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
691 if (!resource) {
692 printk(KERN_ERR "mddi: no associated irq resource!\n");
693 ret = -EINVAL;
694 goto error_get_irq_resource;
695 }
696 mddi->irq = resource->start;
697 printk(KERN_INFO "mddi: init() base=0x%p irq=%d\n", mddi->base,
698 mddi->irq);
699 mddi->power_client = pdata->power_client;
700
701 mutex_init(&mddi->reg_write_lock);
702 mutex_init(&mddi->reg_read_lock);
703 spin_lock_init(&mddi->int_lock);
704 init_waitqueue_head(&mddi->int_wait);
705
706 ret = mddi_clk_setup(pdev, mddi, pdata->clk_rate);
707 if (ret) {
708 printk(KERN_ERR "mddi: failed to setup clock!\n");
709 goto error_clk_setup;
710 }
711
712 ret = mddi_rev_data_setup(mddi);
713 if (ret) {
714 printk(KERN_ERR "mddi: failed to setup rev data!\n");
715 goto error_rev_data;
716 }
717
718 mddi->int_enable = 0;
719 mddi_writel(mddi->int_enable, INTEN);
720 ret = request_irq(mddi->irq, mddi_isr, IRQF_DISABLED, "mddi",
721 &mddi->client_data);
722 if (ret) {
723 printk(KERN_ERR "mddi: failed to request enable irq!\n");
724 goto error_request_irq;
725 }
726
727 /* turn on the mddi client bridge chip */
728 if (mddi->power_client)
729 mddi->power_client(&mddi->client_data, 1);
730
731 /* initialize the mddi registers */
732 mddi_set_auto_hibernate(&mddi->client_data, 0);
733 mddi_writel(MDDI_CMD_RESET, CMD);
734 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
735 mddi->version = mddi_init_registers(mddi);
736 if (mddi->version < 0x20) {
737 printk(KERN_ERR "mddi: unsupported version 0x%x\n",
738 mddi->version);
739 ret = -ENODEV;
740 goto error_mddi_version;
741 }
742
743 /* read the capabilities off the client */
744 if (!mddi_get_client_caps(mddi)) {
745 printk(KERN_INFO "mddi: no client found\n");
746 /* power down the panel */
747 mddi_writel(MDDI_CMD_POWERDOWN, CMD);
748 printk(KERN_INFO "mddi powerdown: stat %x\n", mddi_readl(STAT));
749 msleep(100);
750 printk(KERN_INFO "mddi powerdown: stat %x\n", mddi_readl(STAT));
751 return 0;
752 }
753 mddi_set_auto_hibernate(&mddi->client_data, 1);
754
755 if (mddi->caps.Mfr_Name == 0 && mddi->caps.Product_Code == 0)
756 pdata->fixup(&mddi->caps.Mfr_Name, &mddi->caps.Product_Code);
757
758 mddi->client_pdev.id = 0;
759 for (i = 0; i < pdata->num_clients; i++) {
760 if (pdata->client_platform_data[i].product_id ==
761 (mddi->caps.Mfr_Name << 16 | mddi->caps.Product_Code)) {
762 mddi->client_data.private_client_data =
763 pdata->client_platform_data[i].client_data;
764 mddi->client_pdev.name =
765 pdata->client_platform_data[i].name;
766 mddi->client_pdev.id =
767 pdata->client_platform_data[i].id;
768 /* XXX: possibly set clock */
769 break;
770 }
771 }
772
773 if (i >= pdata->num_clients)
774 mddi->client_pdev.name = "mddi_c_dummy";
775 printk(KERN_INFO "mddi: registering panel %s\n",
776 mddi->client_pdev.name);
777
778 mddi->client_data.suspend = mddi_suspend;
779 mddi->client_data.resume = mddi_resume;
780 mddi->client_data.activate_link = mddi_activate_link;
781 mddi->client_data.remote_write = mddi_remote_write;
782 mddi->client_data.remote_read = mddi_remote_read;
783 mddi->client_data.auto_hibernate = mddi_set_auto_hibernate;
784 mddi->client_data.fb_resource = pdata->fb_resource;
785 if (pdev->id == 0)
786 mddi->client_data.interface_type = MSM_MDDI_PMDH_INTERFACE;
787 else if (pdev->id == 1)
788 mddi->client_data.interface_type = MSM_MDDI_EMDH_INTERFACE;
789 else {
790 printk(KERN_ERR "mddi: can not determine interface %d!\n",
791 pdev->id);
792 ret = -EINVAL;
793 goto error_mddi_interface;
794 }
795
796 mddi->client_pdev.dev.platform_data = &mddi->client_data;
797 printk(KERN_INFO "mddi: publish: %s\n", mddi->client_name);
798 platform_device_register(&mddi->client_pdev);
799 return 0;
800
801 error_mddi_interface:
802 error_mddi_version:
803 free_irq(mddi->irq, 0);
804 error_request_irq:
805 dma_free_coherent(NULL, 0x1000, mddi->rev_data, mddi->rev_addr);
806 error_rev_data:
807 error_clk_setup:
808 error_get_irq_resource:
809 iounmap(mddi->base);
810 error_ioremap:
811
812 printk(KERN_INFO "mddi: mddi_init() failed (%d)\n", ret);
813 return ret;
814 }
815
816
817 static struct platform_driver mddi_driver = {
818 .probe = mddi_probe,
819 .driver = { .name = "msm_mddi" },
820 };
821
822 static int __init _mddi_init(void)
823 {
824 return platform_driver_register(&mddi_driver);
825 }
826
827 module_init(_mddi_init);
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