tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 <mach/msm_iomap.h>
28#include <mach/irqs.h>
29#include <mach/board.h>
30#include <linux/delay.h>
31
32#include <mach/msm_fb.h>
33#include "mddi_hw.h"
34
35#define FLAG_DISABLE_HIBERNATION 0x0001
36#define FLAG_HAVE_CAPS 0x0002
37#define FLAG_HAS_VSYNC_IRQ 0x0004
38#define FLAG_HAVE_STATUS 0x0008
39
40#define CMD_GET_CLIENT_CAP 0x0601
41#define CMD_GET_CLIENT_STATUS 0x0602
42
43union mddi_rev {
44 unsigned char raw[MDDI_REV_BUFFER_SIZE];
45 struct mddi_rev_packet hdr;
46 struct mddi_client_status status;
47 struct mddi_client_caps caps;
48 struct mddi_register_access reg;
49};
50
51struct reg_read_info {
52 struct completion done;
53 uint32_t reg;
54 uint32_t status;
55 uint32_t result;
56};
57
58struct mddi_info {
59 uint16_t flags;
60 uint16_t version;
61 char __iomem *base;
62 int irq;
63 struct clk *clk;
64 struct msm_mddi_client_data client_data;
65
66 /* buffer for rev encap packets */
67 void *rev_data;
68 dma_addr_t rev_addr;
69 struct mddi_llentry *reg_write_data;
70 dma_addr_t reg_write_addr;
71 struct mddi_llentry *reg_read_data;
72 dma_addr_t reg_read_addr;
73 size_t rev_data_curr;
74
75 spinlock_t int_lock;
76 uint32_t int_enable;
77 uint32_t got_int;
78 wait_queue_head_t int_wait;
79
80 struct mutex reg_write_lock;
81 struct mutex reg_read_lock;
82 struct reg_read_info *reg_read;
83
84 struct mddi_client_caps caps;
85 struct mddi_client_status status;
86
87 void (*power_client)(struct msm_mddi_client_data *, int);
88
89 /* client device published to bind us to the
90 * appropriate mddi_client driver
91 */
92 char client_name[20];
93
94 struct platform_device client_pdev;
95};
96
97static void mddi_init_rev_encap(struct mddi_info *mddi);
98
99#define mddi_readl(r) readl(mddi->base + (MDDI_##r))
100#define mddi_writel(v, r) writel((v), mddi->base + (MDDI_##r))
101
102void mddi_activate_link(struct msm_mddi_client_data *cdata)
103{
104 struct mddi_info *mddi = container_of(cdata, struct mddi_info,
105 client_data);
106
107 mddi_writel(MDDI_CMD_LINK_ACTIVE, CMD);
108}
109
110static void mddi_handle_link_list_done(struct mddi_info *mddi)
111{
112}
113
114static void mddi_reset_rev_encap_ptr(struct mddi_info *mddi)
115{
116 printk(KERN_INFO "mddi: resetting rev ptr\n");
117 mddi->rev_data_curr = 0;
118 mddi_writel(mddi->rev_addr, REV_PTR);
119 mddi_writel(mddi->rev_addr, REV_PTR);
120 mddi_writel(MDDI_CMD_FORCE_NEW_REV_PTR, CMD);
121}
122
123static void mddi_handle_rev_data(struct mddi_info *mddi, union mddi_rev *rev)
124{
125 int i;
126 struct reg_read_info *ri;
127
128 if ((rev->hdr.length <= MDDI_REV_BUFFER_SIZE - 2) &&
129 (rev->hdr.length >= sizeof(struct mddi_rev_packet) - 2)) {
130
131 switch (rev->hdr.type) {
132 case TYPE_CLIENT_CAPS:
133 memcpy(&mddi->caps, &rev->caps,
134 sizeof(struct mddi_client_caps));
135 mddi->flags |= FLAG_HAVE_CAPS;
136 wake_up(&mddi->int_wait);
137 break;
138 case TYPE_CLIENT_STATUS:
139 memcpy(&mddi->status, &rev->status,
140 sizeof(struct mddi_client_status));
141 mddi->flags |= FLAG_HAVE_STATUS;
142 wake_up(&mddi->int_wait);
143 break;
144 case TYPE_REGISTER_ACCESS:
145 ri = mddi->reg_read;
146 if (ri == 0) {
147 printk(KERN_INFO "rev: got reg %x = %x without "
148 " pending read\n",
149 rev->reg.register_address,
150 rev->reg.register_data_list);
151 break;
152 }
153 if (ri->reg != rev->reg.register_address) {
154 printk(KERN_INFO "rev: got reg %x = %x for "
155 "wrong register, expected "
156 "%x\n",
157 rev->reg.register_address,
158 rev->reg.register_data_list, ri->reg);
159 break;
160 }
161 mddi->reg_read = NULL;
162 ri->status = 0;
163 ri->result = rev->reg.register_data_list;
164 complete(&ri->done);
165 break;
166 default:
167 printk(KERN_INFO "rev: unknown reverse packet: "
168 "len=%04x type=%04x CURR_REV_PTR=%x\n",
169 rev->hdr.length, rev->hdr.type,
170 mddi_readl(CURR_REV_PTR));
171 for (i = 0; i < rev->hdr.length + 2; i++) {
172 if ((i % 16) == 0)
173 printk(KERN_INFO "\n");
174 printk(KERN_INFO " %02x", rev->raw[i]);
175 }
176 printk(KERN_INFO "\n");
177 mddi_reset_rev_encap_ptr(mddi);
178 }
179 } else {
180 printk(KERN_INFO "bad rev length, %d, CURR_REV_PTR %x\n",
181 rev->hdr.length, mddi_readl(CURR_REV_PTR));
182 mddi_reset_rev_encap_ptr(mddi);
183 }
184}
185
186static void mddi_wait_interrupt(struct mddi_info *mddi, uint32_t intmask);
187
188static void mddi_handle_rev_data_avail(struct mddi_info *mddi)
189{
190 union mddi_rev *rev = mddi->rev_data;
191 uint32_t rev_data_count;
192 uint32_t rev_crc_err_count;
193 int i;
194 struct reg_read_info *ri;
195 size_t prev_offset;
196 uint16_t length;
197
198 union mddi_rev *crev = mddi->rev_data + mddi->rev_data_curr;
199
200 /* clear the interrupt */
201 mddi_writel(MDDI_INT_REV_DATA_AVAIL, INT);
202 rev_data_count = mddi_readl(REV_PKT_CNT);
203 rev_crc_err_count = mddi_readl(REV_CRC_ERR);
204 if (rev_data_count > 1)
205 printk(KERN_INFO "rev_data_count %d\n", rev_data_count);
206
207 if (rev_crc_err_count) {
208 printk(KERN_INFO "rev_crc_err_count %d, INT %x\n",
209 rev_crc_err_count, mddi_readl(INT));
210 ri = mddi->reg_read;
211 if (ri == 0) {
212 printk(KERN_INFO "rev: got crc error without pending "
213 "read\n");
214 } else {
215 mddi->reg_read = NULL;
216 ri->status = -EIO;
217 ri->result = -1;
218 complete(&ri->done);
219 }
220 }
221
222 if (rev_data_count == 0)
223 return;
224
225 prev_offset = mddi->rev_data_curr;
226
227 length = *((uint8_t *)mddi->rev_data + mddi->rev_data_curr);
228 mddi->rev_data_curr++;
229 if (mddi->rev_data_curr == MDDI_REV_BUFFER_SIZE)
230 mddi->rev_data_curr = 0;
231 length += *((uint8_t *)mddi->rev_data + mddi->rev_data_curr) << 8;
232 mddi->rev_data_curr += 1 + length;
233 if (mddi->rev_data_curr >= MDDI_REV_BUFFER_SIZE)
234 mddi->rev_data_curr =
235 mddi->rev_data_curr % MDDI_REV_BUFFER_SIZE;
236
237 if (length > MDDI_REV_BUFFER_SIZE - 2) {
238 printk(KERN_INFO "mddi: rev data length greater than buffer"
239 "size\n");
240 mddi_reset_rev_encap_ptr(mddi);
241 return;
242 }
243
244 if (prev_offset + 2 + length >= MDDI_REV_BUFFER_SIZE) {
245 union mddi_rev tmprev;
246 size_t rem = MDDI_REV_BUFFER_SIZE - prev_offset;
247 memcpy(&tmprev.raw[0], mddi->rev_data + prev_offset, rem);
248 memcpy(&tmprev.raw[rem], mddi->rev_data, 2 + length - rem);
249 mddi_handle_rev_data(mddi, &tmprev);
250 } else {
251 mddi_handle_rev_data(mddi, crev);
252 }
253
254 if (prev_offset < MDDI_REV_BUFFER_SIZE / 2 &&
255 mddi->rev_data_curr >= MDDI_REV_BUFFER_SIZE / 2) {
256 mddi_writel(mddi->rev_addr, REV_PTR);
257 }
258}
259
260static irqreturn_t mddi_isr(int irq, void *data)
261{
262 struct msm_mddi_client_data *cdata = data;
263 struct mddi_info *mddi = container_of(cdata, struct mddi_info,
264 client_data);
265 uint32_t active, status;
266
267 spin_lock(&mddi->int_lock);
268
269 active = mddi_readl(INT);
270 status = mddi_readl(STAT);
271
272 mddi_writel(active, INT);
273
274 /* ignore any interrupts we have disabled */
275 active &= mddi->int_enable;
276
277 mddi->got_int |= active;
278 wake_up(&mddi->int_wait);
279
280 if (active & MDDI_INT_PRI_LINK_LIST_DONE) {
281 mddi->int_enable &= (~MDDI_INT_PRI_LINK_LIST_DONE);
282 mddi_handle_link_list_done(mddi);
283 }
284 if (active & MDDI_INT_REV_DATA_AVAIL)
285 mddi_handle_rev_data_avail(mddi);
286
287 if (active & ~MDDI_INT_NEED_CLEAR)
288 mddi->int_enable &= ~(active & ~MDDI_INT_NEED_CLEAR);
289
290 if (active & MDDI_INT_LINK_ACTIVE) {
291 mddi->int_enable &= (~MDDI_INT_LINK_ACTIVE);
292 mddi->int_enable |= MDDI_INT_IN_HIBERNATION;
293 }
294
295 if (active & MDDI_INT_IN_HIBERNATION) {
296 mddi->int_enable &= (~MDDI_INT_IN_HIBERNATION);
297 mddi->int_enable |= MDDI_INT_LINK_ACTIVE;
298 }
299
300 mddi_writel(mddi->int_enable, INTEN);
301 spin_unlock(&mddi->int_lock);
302
303 return IRQ_HANDLED;
304}
305
306static long mddi_wait_interrupt_timeout(struct mddi_info *mddi,
307 uint32_t intmask, int timeout)
308{
309 unsigned long irq_flags;
310
311 spin_lock_irqsave(&mddi->int_lock, irq_flags);
312 mddi->got_int &= ~intmask;
313 mddi->int_enable |= intmask;
314 mddi_writel(mddi->int_enable, INTEN);
315 spin_unlock_irqrestore(&mddi->int_lock, irq_flags);
316 return wait_event_timeout(mddi->int_wait, mddi->got_int & intmask,
317 timeout);
318}
319
320static void mddi_wait_interrupt(struct mddi_info *mddi, uint32_t intmask)
321{
322 if (mddi_wait_interrupt_timeout(mddi, intmask, HZ/10) == 0)
323 printk(KERN_INFO KERN_ERR "mddi_wait_interrupt %d, timeout "
324 "waiting for %x, INT = %x, STAT = %x gotint = %x\n",
325 current->pid, intmask, mddi_readl(INT), mddi_readl(STAT),
326 mddi->got_int);
327}
328
329static void mddi_init_rev_encap(struct mddi_info *mddi)
330{
331 memset(mddi->rev_data, 0xee, MDDI_REV_BUFFER_SIZE);
332 mddi_writel(mddi->rev_addr, REV_PTR);
333 mddi_writel(MDDI_CMD_FORCE_NEW_REV_PTR, CMD);
334 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
335}
336
337void mddi_set_auto_hibernate(struct msm_mddi_client_data *cdata, int on)
338{
339 struct mddi_info *mddi = container_of(cdata, struct mddi_info,
340 client_data);
341 mddi_writel(MDDI_CMD_POWERDOWN, CMD);
342 mddi_wait_interrupt(mddi, MDDI_INT_IN_HIBERNATION);
343 mddi_writel(MDDI_CMD_HIBERNATE | !!on, CMD);
344 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
345}
346
347
348static uint16_t mddi_init_registers(struct mddi_info *mddi)
349{
350 mddi_writel(0x0001, VERSION);
351 mddi_writel(MDDI_HOST_BYTES_PER_SUBFRAME, BPS);
352 mddi_writel(0x0003, SPM); /* subframes per media */
353 mddi_writel(0x0005, TA1_LEN);
354 mddi_writel(MDDI_HOST_TA2_LEN, TA2_LEN);
355 mddi_writel(0x0096, DRIVE_HI);
356 /* 0x32 normal, 0x50 for Toshiba display */
357 mddi_writel(0x0050, DRIVE_LO);
358 mddi_writel(0x003C, DISP_WAKE); /* wakeup counter */
359 mddi_writel(MDDI_HOST_REV_RATE_DIV, REV_RATE_DIV);
360
361 mddi_writel(MDDI_REV_BUFFER_SIZE, REV_SIZE);
362 mddi_writel(MDDI_MAX_REV_PKT_SIZE, REV_ENCAP_SZ);
363
364 /* disable periodic rev encap */
365 mddi_writel(MDDI_CMD_PERIODIC_REV_ENCAP, CMD);
366 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
367
368 if (mddi_readl(PAD_CTL) == 0) {
369 /* If we are turning on band gap, need to wait 5us before
370 * turning on the rest of the PAD */
371 mddi_writel(0x08000, PAD_CTL);
372 udelay(5);
373 }
374
375 /* Recommendation from PAD hw team */
376 mddi_writel(0xa850f, PAD_CTL);
377
378
379 /* Need an even number for counts */
380 mddi_writel(0x60006, DRIVER_START_CNT);
381
382 mddi_set_auto_hibernate(&mddi->client_data, 0);
383
384 mddi_writel(MDDI_CMD_DISP_IGNORE, CMD);
385 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
386
387 mddi_init_rev_encap(mddi);
388 return mddi_readl(CORE_VER) & 0xffff;
389}
390
391static void mddi_suspend(struct msm_mddi_client_data *cdata)
392{
393 struct mddi_info *mddi = container_of(cdata, struct mddi_info,
394 client_data);
395 /* turn off the client */
396 if (mddi->power_client)
397 mddi->power_client(&mddi->client_data, 0);
398 /* turn off the link */
399 mddi_writel(MDDI_CMD_RESET, CMD);
400 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
401 /* turn off the clock */
402 clk_disable(mddi->clk);
403}
404
405static void mddi_resume(struct msm_mddi_client_data *cdata)
406{
407 struct mddi_info *mddi = container_of(cdata, struct mddi_info,
408 client_data);
409 mddi_set_auto_hibernate(&mddi->client_data, 0);
410 /* turn on the client */
411 if (mddi->power_client)
412 mddi->power_client(&mddi->client_data, 1);
413 /* turn on the clock */
414 clk_enable(mddi->clk);
415 /* set up the local registers */
416 mddi->rev_data_curr = 0;
417 mddi_init_registers(mddi);
418 mddi_writel(mddi->int_enable, INTEN);
419 mddi_writel(MDDI_CMD_LINK_ACTIVE, CMD);
420 mddi_writel(MDDI_CMD_SEND_RTD, CMD);
421 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
422 mddi_set_auto_hibernate(&mddi->client_data, 1);
423}
424
425static int __init mddi_get_client_caps(struct mddi_info *mddi)
426{
427 int i, j;
428
429 /* clear any stale interrupts */
430 mddi_writel(0xffffffff, INT);
431
432 mddi->int_enable = MDDI_INT_LINK_ACTIVE |
433 MDDI_INT_IN_HIBERNATION |
434 MDDI_INT_PRI_LINK_LIST_DONE |
435 MDDI_INT_REV_DATA_AVAIL |
436 MDDI_INT_REV_OVERFLOW |
437 MDDI_INT_REV_OVERWRITE |
438 MDDI_INT_RTD_FAILURE;
439 mddi_writel(mddi->int_enable, INTEN);
440
441 mddi_writel(MDDI_CMD_LINK_ACTIVE, CMD);
442 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
443
444 for (j = 0; j < 3; j++) {
445 /* the toshiba vga panel does not respond to get
446 * caps unless you SEND_RTD, but the first SEND_RTD
447 * will fail...
448 */
449 for (i = 0; i < 4; i++) {
450 uint32_t stat;
451
452 mddi_writel(MDDI_CMD_SEND_RTD, CMD);
453 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
454 stat = mddi_readl(STAT);
455 printk(KERN_INFO "mddi cmd send rtd: int %x, stat %x, "
456 "rtd val %x\n", mddi_readl(INT), stat,
457 mddi_readl(RTD_VAL));
458 if ((stat & MDDI_STAT_RTD_MEAS_FAIL) == 0)
459 break;
460 msleep(1);
461 }
462
463 mddi_writel(CMD_GET_CLIENT_CAP, CMD);
464 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
465 wait_event_timeout(mddi->int_wait, mddi->flags & FLAG_HAVE_CAPS,
466 HZ / 100);
467
468 if (mddi->flags & FLAG_HAVE_CAPS)
469 break;
470 printk(KERN_INFO KERN_ERR "mddi_init, timeout waiting for "
471 "caps\n");
472 }
473 return mddi->flags & FLAG_HAVE_CAPS;
474}
475
476/* link must be active when this is called */
477int mddi_check_status(struct mddi_info *mddi)
478{
479 int ret = -1, retry = 3;
480 mutex_lock(&mddi->reg_read_lock);
481 mddi_writel(MDDI_CMD_PERIODIC_REV_ENCAP | 1, CMD);
482 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
483
484 do {
485 mddi->flags &= ~FLAG_HAVE_STATUS;
486 mddi_writel(CMD_GET_CLIENT_STATUS, CMD);
487 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
488 wait_event_timeout(mddi->int_wait,
489 mddi->flags & FLAG_HAVE_STATUS,
490 HZ / 100);
491
492 if (mddi->flags & FLAG_HAVE_STATUS) {
493 if (mddi->status.crc_error_count)
494 printk(KERN_INFO "mddi status: crc_error "
495 "count: %d\n",
496 mddi->status.crc_error_count);
497 else
498 ret = 0;
499 break;
500 } else
501 printk(KERN_INFO "mddi status: failed to get client "
502 "status\n");
503 mddi_writel(MDDI_CMD_SEND_RTD, CMD);
504 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
505 } while (--retry);
506
507 mddi_writel(MDDI_CMD_PERIODIC_REV_ENCAP | 0, CMD);
508 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
509 mutex_unlock(&mddi->reg_read_lock);
510 return ret;
511}
512
513
514void mddi_remote_write(struct msm_mddi_client_data *cdata, uint32_t val,
515 uint32_t reg)
516{
517 struct mddi_info *mddi = container_of(cdata, struct mddi_info,
518 client_data);
519 struct mddi_llentry *ll;
520 struct mddi_register_access *ra;
521
522 mutex_lock(&mddi->reg_write_lock);
523
524 ll = mddi->reg_write_data;
525
526 ra = &(ll->u.r);
527 ra->length = 14 + 4;
528 ra->type = TYPE_REGISTER_ACCESS;
529 ra->client_id = 0;
530 ra->read_write_info = MDDI_WRITE | 1;
531 ra->crc16 = 0;
532
533 ra->register_address = reg;
534 ra->register_data_list = val;
535
536 ll->flags = 1;
537 ll->header_count = 14;
538 ll->data_count = 4;
539 ll->data = mddi->reg_write_addr + offsetof(struct mddi_llentry,
540 u.r.register_data_list);
541 ll->next = 0;
542 ll->reserved = 0;
543
544 mddi_writel(mddi->reg_write_addr, PRI_PTR);
545
546 mddi_wait_interrupt(mddi, MDDI_INT_PRI_LINK_LIST_DONE);
547 mutex_unlock(&mddi->reg_write_lock);
548}
549
550uint32_t mddi_remote_read(struct msm_mddi_client_data *cdata, uint32_t reg)
551{
552 struct mddi_info *mddi = container_of(cdata, struct mddi_info,
553 client_data);
554 struct mddi_llentry *ll;
555 struct mddi_register_access *ra;
556 struct reg_read_info ri;
557 unsigned s;
558 int retry_count = 2;
559 unsigned long irq_flags;
560
561 mutex_lock(&mddi->reg_read_lock);
562
563 ll = mddi->reg_read_data;
564
565 ra = &(ll->u.r);
566 ra->length = 14;
567 ra->type = TYPE_REGISTER_ACCESS;
568 ra->client_id = 0;
569 ra->read_write_info = MDDI_READ | 1;
570 ra->crc16 = 0;
571
572 ra->register_address = reg;
573
574 ll->flags = 0x11;
575 ll->header_count = 14;
576 ll->data_count = 0;
577 ll->data = 0;
578 ll->next = 0;
579 ll->reserved = 0;
580
581 s = mddi_readl(STAT);
582
583 ri.reg = reg;
584 ri.status = -1;
585
586 do {
587 init_completion(&ri.done);
588 mddi->reg_read = &ri;
589 mddi_writel(mddi->reg_read_addr, PRI_PTR);
590
591 mddi_wait_interrupt(mddi, MDDI_INT_PRI_LINK_LIST_DONE);
592
593 /* Enable Periodic Reverse Encapsulation. */
594 mddi_writel(MDDI_CMD_PERIODIC_REV_ENCAP | 1, CMD);
595 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
596 if (wait_for_completion_timeout(&ri.done, HZ/10) == 0 &&
597 !ri.done.done) {
598 printk(KERN_INFO "mddi_remote_read(%x) timeout "
599 "(%d %d %d)\n",
600 reg, ri.status, ri.result, ri.done.done);
601 spin_lock_irqsave(&mddi->int_lock, irq_flags);
602 mddi->reg_read = NULL;
603 spin_unlock_irqrestore(&mddi->int_lock, irq_flags);
604 ri.status = -1;
605 ri.result = -1;
606 }
607 if (ri.status == 0)
608 break;
609
610 mddi_writel(MDDI_CMD_SEND_RTD, CMD);
611 mddi_writel(MDDI_CMD_LINK_ACTIVE, CMD);
612 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
613 printk(KERN_INFO "mddi_remote_read: failed, sent "
614 "MDDI_CMD_SEND_RTD: int %x, stat %x, rtd val %x "
615 "curr_rev_ptr %x\n", mddi_readl(INT), mddi_readl(STAT),
616 mddi_readl(RTD_VAL), mddi_readl(CURR_REV_PTR));
617 } while (retry_count-- > 0);
618 /* Disable Periodic Reverse Encapsulation. */
619 mddi_writel(MDDI_CMD_PERIODIC_REV_ENCAP | 0, CMD);
620 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
621 mddi->reg_read = NULL;
622 mutex_unlock(&mddi->reg_read_lock);
623 return ri.result;
624}
625
626static struct mddi_info mddi_info[2];
627
628static int __init mddi_clk_setup(struct platform_device *pdev,
629 struct mddi_info *mddi,
630 unsigned long clk_rate)
631{
632 int ret;
633
634 /* set up the clocks */
635 mddi->clk = clk_get(&pdev->dev, "mddi_clk");
636 if (IS_ERR(mddi->clk)) {
637 printk(KERN_INFO "mddi: failed to get clock\n");
638 return PTR_ERR(mddi->clk);
639 }
640 ret = clk_enable(mddi->clk);
641 if (ret)
642 goto fail;
643 ret = clk_set_rate(mddi->clk, clk_rate);
644 if (ret)
645 goto fail;
646 return 0;
647
648fail:
649 clk_put(mddi->clk);
650 return ret;
651}
652
653static int __init mddi_rev_data_setup(struct mddi_info *mddi)
654{
655 void *dma;
656 dma_addr_t dma_addr;
657
658 /* set up dma buffer */
659 dma = dma_alloc_coherent(NULL, 0x1000, &dma_addr, GFP_KERNEL);
660 if (dma == 0)
661 return -ENOMEM;
662 mddi->rev_data = dma;
663 mddi->rev_data_curr = 0;
664 mddi->rev_addr = dma_addr;
665 mddi->reg_write_data = dma + MDDI_REV_BUFFER_SIZE;
666 mddi->reg_write_addr = dma_addr + MDDI_REV_BUFFER_SIZE;
667 mddi->reg_read_data = mddi->reg_write_data + 1;
668 mddi->reg_read_addr = mddi->reg_write_addr +
669 sizeof(*mddi->reg_write_data);
670 return 0;
671}
672
673static int __init mddi_probe(struct platform_device *pdev)
674{
675 struct msm_mddi_platform_data *pdata = pdev->dev.platform_data;
676 struct mddi_info *mddi = &mddi_info[pdev->id];
677 struct resource *resource;
678 int ret, i;
679
680 resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
681 if (!resource) {
682 printk(KERN_ERR "mddi: no associated mem resource!\n");
683 return -ENOMEM;
684 }
685 mddi->base = ioremap(resource->start, resource->end - resource->start);
686 if (!mddi->base) {
687 printk(KERN_ERR "mddi: failed to remap base!\n");
688 ret = -EINVAL;
689 goto error_ioremap;
690 }
691 resource = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
692 if (!resource) {
693 printk(KERN_ERR "mddi: no associated irq resource!\n");
694 ret = -EINVAL;
695 goto error_get_irq_resource;
696 }
697 mddi->irq = resource->start;
698 printk(KERN_INFO "mddi: init() base=0x%p irq=%d\n", mddi->base,
699 mddi->irq);
700 mddi->power_client = pdata->power_client;
701
702 mutex_init(&mddi->reg_write_lock);
703 mutex_init(&mddi->reg_read_lock);
704 spin_lock_init(&mddi->int_lock);
705 init_waitqueue_head(&mddi->int_wait);
706
707 ret = mddi_clk_setup(pdev, mddi, pdata->clk_rate);
708 if (ret) {
709 printk(KERN_ERR "mddi: failed to setup clock!\n");
710 goto error_clk_setup;
711 }
712
713 ret = mddi_rev_data_setup(mddi);
714 if (ret) {
715 printk(KERN_ERR "mddi: failed to setup rev data!\n");
716 goto error_rev_data;
717 }
718
719 mddi->int_enable = 0;
720 mddi_writel(mddi->int_enable, INTEN);
721 ret = request_irq(mddi->irq, mddi_isr, IRQF_DISABLED, "mddi",
722 &mddi->client_data);
723 if (ret) {
724 printk(KERN_ERR "mddi: failed to request enable irq!\n");
725 goto error_request_irq;
726 }
727
728 /* turn on the mddi client bridge chip */
729 if (mddi->power_client)
730 mddi->power_client(&mddi->client_data, 1);
731
732 /* initialize the mddi registers */
733 mddi_set_auto_hibernate(&mddi->client_data, 0);
734 mddi_writel(MDDI_CMD_RESET, CMD);
735 mddi_wait_interrupt(mddi, MDDI_INT_NO_CMD_PKTS_PEND);
736 mddi->version = mddi_init_registers(mddi);
737 if (mddi->version < 0x20) {
738 printk(KERN_ERR "mddi: unsupported version 0x%x\n",
739 mddi->version);
740 ret = -ENODEV;
741 goto error_mddi_version;
742 }
743
744 /* read the capabilities off the client */
745 if (!mddi_get_client_caps(mddi)) {
746 printk(KERN_INFO "mddi: no client found\n");
747 /* power down the panel */
748 mddi_writel(MDDI_CMD_POWERDOWN, CMD);
749 printk(KERN_INFO "mddi powerdown: stat %x\n", mddi_readl(STAT));
750 msleep(100);
751 printk(KERN_INFO "mddi powerdown: stat %x\n", mddi_readl(STAT));
752 return 0;
753 }
754 mddi_set_auto_hibernate(&mddi->client_data, 1);
755
756 if (mddi->caps.Mfr_Name == 0 && mddi->caps.Product_Code == 0)
757 pdata->fixup(&mddi->caps.Mfr_Name, &mddi->caps.Product_Code);
758
759 mddi->client_pdev.id = 0;
760 for (i = 0; i < pdata->num_clients; i++) {
761 if (pdata->client_platform_data[i].product_id ==
762 (mddi->caps.Mfr_Name << 16 | mddi->caps.Product_Code)) {
763 mddi->client_data.private_client_data =
764 pdata->client_platform_data[i].client_data;
765 mddi->client_pdev.name =
766 pdata->client_platform_data[i].name;
767 mddi->client_pdev.id =
768 pdata->client_platform_data[i].id;
769 /* XXX: possibly set clock */
770 break;
771 }
772 }
773
774 if (i >= pdata->num_clients)
775 mddi->client_pdev.name = "mddi_c_dummy";
776 printk(KERN_INFO "mddi: registering panel %s\n",
777 mddi->client_pdev.name);
778
779 mddi->client_data.suspend = mddi_suspend;
780 mddi->client_data.resume = mddi_resume;
781 mddi->client_data.activate_link = mddi_activate_link;
782 mddi->client_data.remote_write = mddi_remote_write;
783 mddi->client_data.remote_read = mddi_remote_read;
784 mddi->client_data.auto_hibernate = mddi_set_auto_hibernate;
785 mddi->client_data.fb_resource = pdata->fb_resource;
786 if (pdev->id == 0)
787 mddi->client_data.interface_type = MSM_MDDI_PMDH_INTERFACE;
788 else if (pdev->id == 1)
789 mddi->client_data.interface_type = MSM_MDDI_EMDH_INTERFACE;
790 else {
791 printk(KERN_ERR "mddi: can not determine interface %d!\n",
792 pdev->id);
793 ret = -EINVAL;
794 goto error_mddi_interface;
795 }
796
797 mddi->client_pdev.dev.platform_data = &mddi->client_data;
798 printk(KERN_INFO "mddi: publish: %s\n", mddi->client_name);
799 platform_device_register(&mddi->client_pdev);
800 return 0;
801
802error_mddi_interface:
803error_mddi_version:
804 free_irq(mddi->irq, 0);
805error_request_irq:
806 dma_free_coherent(NULL, 0x1000, mddi->rev_data, mddi->rev_addr);
807error_rev_data:
808error_clk_setup:
809error_get_irq_resource:
810 iounmap(mddi->base);
811error_ioremap:
812
813 printk(KERN_INFO "mddi: mddi_init() failed (%d)\n", ret);
814 return ret;
815}
816
817
818static struct platform_driver mddi_driver = {
819 .probe = mddi_probe,
820 .driver = { .name = "msm_mddi" },
821};
822
823static int __init _mddi_init(void)
824{
825 return platform_driver_register(&mddi_driver);
826}
827
828module_init(_mddi_init);