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1/*
2 * broadsheetfb.c -- FB driver for E-Ink Broadsheet controller
3 *
4 * Copyright (C) 2008, Jaya Kumar
5 *
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file COPYING in the main directory of this archive for
8 * more details.
9 *
10 * Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven.
11 *
12 * This driver is written to be used with the Broadsheet display controller.
13 *
14 * It is intended to be architecture independent. A board specific driver
15 * must be used to perform all the physical IO interactions.
16 *
17 */
18
19#include <linux/module.h>
20#include <linux/kernel.h>
21#include <linux/errno.h>
22#include <linux/string.h>
23#include <linux/mm.h>
24#include <linux/slab.h>
25#include <linux/vmalloc.h>
26#include <linux/delay.h>
27#include <linux/interrupt.h>
28#include <linux/fb.h>
29#include <linux/init.h>
30#include <linux/platform_device.h>
31#include <linux/list.h>
32#include <linux/firmware.h>
33#include <linux/uaccess.h>
34
35#include <video/broadsheetfb.h>
36
37/* track panel specific parameters */
38struct panel_info {
39 int w;
40 int h;
41 u16 sdcfg;
42 u16 gdcfg;
43 u16 lutfmt;
44 u16 fsynclen;
45 u16 fendfbegin;
46 u16 lsynclen;
47 u16 lendlbegin;
48 u16 pixclk;
49};
50
51/* table of panel specific parameters to be indexed into by the board drivers */
52static struct panel_info panel_table[] = {
53 { /* standard 6" on TFT backplane */
54 .w = 800,
55 .h = 600,
56 .sdcfg = (100 | (1 << 8) | (1 << 9)),
57 .gdcfg = 2,
58 .lutfmt = (4 | (1 << 7)),
59 .fsynclen = 4,
60 .fendfbegin = (10 << 8) | 4,
61 .lsynclen = 10,
62 .lendlbegin = (100 << 8) | 4,
63 .pixclk = 6,
64 },
65 { /* custom 3.7" flexible on PET or steel */
66 .w = 320,
67 .h = 240,
68 .sdcfg = (67 | (0 << 8) | (0 << 9) | (0 << 10) | (0 << 12)),
69 .gdcfg = 3,
70 .lutfmt = (4 | (1 << 7)),
71 .fsynclen = 0,
72 .fendfbegin = (80 << 8) | 4,
73 .lsynclen = 10,
74 .lendlbegin = (80 << 8) | 20,
75 .pixclk = 14,
76 },
77 { /* standard 9.7" on TFT backplane */
78 .w = 1200,
79 .h = 825,
80 .sdcfg = (100 | (1 << 8) | (1 << 9) | (0 << 10) | (0 << 12)),
81 .gdcfg = 2,
82 .lutfmt = (4 | (1 << 7)),
83 .fsynclen = 0,
84 .fendfbegin = (4 << 8) | 4,
85 .lsynclen = 4,
86 .lendlbegin = (60 << 8) | 10,
87 .pixclk = 3,
88 },
89};
90
91#define DPY_W 800
92#define DPY_H 600
93
94static struct fb_fix_screeninfo broadsheetfb_fix = {
95 .id = "broadsheetfb",
96 .type = FB_TYPE_PACKED_PIXELS,
97 .visual = FB_VISUAL_STATIC_PSEUDOCOLOR,
98 .xpanstep = 0,
99 .ypanstep = 0,
100 .ywrapstep = 0,
101 .line_length = DPY_W,
102 .accel = FB_ACCEL_NONE,
103};
104
105static struct fb_var_screeninfo broadsheetfb_var = {
106 .xres = DPY_W,
107 .yres = DPY_H,
108 .xres_virtual = DPY_W,
109 .yres_virtual = DPY_H,
110 .bits_per_pixel = 8,
111 .grayscale = 1,
112 .red = { 0, 4, 0 },
113 .green = { 0, 4, 0 },
114 .blue = { 0, 4, 0 },
115 .transp = { 0, 0, 0 },
116};
117
118/* main broadsheetfb functions */
119static void broadsheet_gpio_issue_data(struct broadsheetfb_par *par, u16 data)
120{
121 par->board->set_ctl(par, BS_WR, 0);
122 par->board->set_hdb(par, data);
123 par->board->set_ctl(par, BS_WR, 1);
124}
125
126static void broadsheet_gpio_issue_cmd(struct broadsheetfb_par *par, u16 data)
127{
128 par->board->set_ctl(par, BS_DC, 0);
129 broadsheet_gpio_issue_data(par, data);
130}
131
132static void broadsheet_gpio_send_command(struct broadsheetfb_par *par, u16 data)
133{
134 par->board->wait_for_rdy(par);
135
136 par->board->set_ctl(par, BS_CS, 0);
137 broadsheet_gpio_issue_cmd(par, data);
138 par->board->set_ctl(par, BS_DC, 1);
139 par->board->set_ctl(par, BS_CS, 1);
140}
141
142static void broadsheet_gpio_send_cmdargs(struct broadsheetfb_par *par, u16 cmd,
143 int argc, u16 *argv)
144{
145 int i;
146
147 par->board->wait_for_rdy(par);
148
149 par->board->set_ctl(par, BS_CS, 0);
150 broadsheet_gpio_issue_cmd(par, cmd);
151 par->board->set_ctl(par, BS_DC, 1);
152
153 for (i = 0; i < argc; i++)
154 broadsheet_gpio_issue_data(par, argv[i]);
155 par->board->set_ctl(par, BS_CS, 1);
156}
157
158static void broadsheet_mmio_send_cmdargs(struct broadsheetfb_par *par, u16 cmd,
159 int argc, u16 *argv)
160{
161 int i;
162
163 par->board->mmio_write(par, BS_MMIO_CMD, cmd);
164
165 for (i = 0; i < argc; i++)
166 par->board->mmio_write(par, BS_MMIO_DATA, argv[i]);
167}
168
169static void broadsheet_send_command(struct broadsheetfb_par *par, u16 data)
170{
171 if (par->board->mmio_write)
172 par->board->mmio_write(par, BS_MMIO_CMD, data);
173 else
174 broadsheet_gpio_send_command(par, data);
175}
176
177static void broadsheet_send_cmdargs(struct broadsheetfb_par *par, u16 cmd,
178 int argc, u16 *argv)
179{
180 if (par->board->mmio_write)
181 broadsheet_mmio_send_cmdargs(par, cmd, argc, argv);
182 else
183 broadsheet_gpio_send_cmdargs(par, cmd, argc, argv);
184}
185
186static void broadsheet_gpio_burst_write(struct broadsheetfb_par *par, int size,
187 u16 *data)
188{
189 int i;
190 u16 tmp;
191
192 par->board->set_ctl(par, BS_CS, 0);
193 par->board->set_ctl(par, BS_DC, 1);
194
195 for (i = 0; i < size; i++) {
196 par->board->set_ctl(par, BS_WR, 0);
197 tmp = (data[i] & 0x0F) << 4;
198 tmp |= (data[i] & 0x0F00) << 4;
199 par->board->set_hdb(par, tmp);
200 par->board->set_ctl(par, BS_WR, 1);
201 }
202
203 par->board->set_ctl(par, BS_CS, 1);
204}
205
206static void broadsheet_mmio_burst_write(struct broadsheetfb_par *par, int size,
207 u16 *data)
208{
209 int i;
210 u16 tmp;
211
212 for (i = 0; i < size; i++) {
213 tmp = (data[i] & 0x0F) << 4;
214 tmp |= (data[i] & 0x0F00) << 4;
215 par->board->mmio_write(par, BS_MMIO_DATA, tmp);
216 }
217
218}
219
220static void broadsheet_burst_write(struct broadsheetfb_par *par, int size,
221 u16 *data)
222{
223 if (par->board->mmio_write)
224 broadsheet_mmio_burst_write(par, size, data);
225 else
226 broadsheet_gpio_burst_write(par, size, data);
227}
228
229static u16 broadsheet_gpio_get_data(struct broadsheetfb_par *par)
230{
231 u16 res;
232 /* wait for ready to go hi. (lo is busy) */
233 par->board->wait_for_rdy(par);
234
235 /* cs lo, dc lo for cmd, we lo for each data, db as usual */
236 par->board->set_ctl(par, BS_DC, 1);
237 par->board->set_ctl(par, BS_CS, 0);
238 par->board->set_ctl(par, BS_WR, 0);
239
240 res = par->board->get_hdb(par);
241
242 /* strobe wr */
243 par->board->set_ctl(par, BS_WR, 1);
244 par->board->set_ctl(par, BS_CS, 1);
245
246 return res;
247}
248
249
250static u16 broadsheet_get_data(struct broadsheetfb_par *par)
251{
252 if (par->board->mmio_read)
253 return par->board->mmio_read(par);
254 else
255 return broadsheet_gpio_get_data(par);
256}
257
258static void broadsheet_gpio_write_reg(struct broadsheetfb_par *par, u16 reg,
259 u16 data)
260{
261 /* wait for ready to go hi. (lo is busy) */
262 par->board->wait_for_rdy(par);
263
264 /* cs lo, dc lo for cmd, we lo for each data, db as usual */
265 par->board->set_ctl(par, BS_CS, 0);
266
267 broadsheet_gpio_issue_cmd(par, BS_CMD_WR_REG);
268
269 par->board->set_ctl(par, BS_DC, 1);
270
271 broadsheet_gpio_issue_data(par, reg);
272 broadsheet_gpio_issue_data(par, data);
273
274 par->board->set_ctl(par, BS_CS, 1);
275}
276
277static void broadsheet_mmio_write_reg(struct broadsheetfb_par *par, u16 reg,
278 u16 data)
279{
280 par->board->mmio_write(par, BS_MMIO_CMD, BS_CMD_WR_REG);
281 par->board->mmio_write(par, BS_MMIO_DATA, reg);
282 par->board->mmio_write(par, BS_MMIO_DATA, data);
283
284}
285
286static void broadsheet_write_reg(struct broadsheetfb_par *par, u16 reg,
287 u16 data)
288{
289 if (par->board->mmio_write)
290 broadsheet_mmio_write_reg(par, reg, data);
291 else
292 broadsheet_gpio_write_reg(par, reg, data);
293}
294
295static void broadsheet_write_reg32(struct broadsheetfb_par *par, u16 reg,
296 u32 data)
297{
298 broadsheet_write_reg(par, reg, cpu_to_le32(data) & 0xFFFF);
299 broadsheet_write_reg(par, reg + 2, (cpu_to_le32(data) >> 16) & 0xFFFF);
300}
301
302
303static u16 broadsheet_read_reg(struct broadsheetfb_par *par, u16 reg)
304{
305 broadsheet_send_cmdargs(par, BS_CMD_RD_REG, 1, &reg);
306 par->board->wait_for_rdy(par);
307 return broadsheet_get_data(par);
308}
309
310/* functions for waveform manipulation */
311static int is_broadsheet_pll_locked(struct broadsheetfb_par *par)
312{
313 return broadsheet_read_reg(par, 0x000A) & 0x0001;
314}
315
316static int broadsheet_setup_plls(struct broadsheetfb_par *par)
317{
318 int retry_count = 0;
319 u16 tmp;
320
321 /* disable arral saemipu mode */
322 broadsheet_write_reg(par, 0x0006, 0x0000);
323
324 broadsheet_write_reg(par, 0x0010, 0x0004);
325 broadsheet_write_reg(par, 0x0012, 0x5949);
326 broadsheet_write_reg(par, 0x0014, 0x0040);
327 broadsheet_write_reg(par, 0x0016, 0x0000);
328
329 do {
330 if (retry_count++ > 100)
331 return -ETIMEDOUT;
332 mdelay(1);
333 } while (!is_broadsheet_pll_locked(par));
334
335 tmp = broadsheet_read_reg(par, 0x0006);
336 tmp &= ~0x1;
337 broadsheet_write_reg(par, 0x0006, tmp);
338
339 return 0;
340}
341
342static int broadsheet_setup_spi(struct broadsheetfb_par *par)
343{
344
345 broadsheet_write_reg(par, 0x0204, ((3 << 3) | 1));
346 broadsheet_write_reg(par, 0x0208, 0x0001);
347
348 return 0;
349}
350
351static int broadsheet_setup_spiflash(struct broadsheetfb_par *par,
352 u16 *orig_sfmcd)
353{
354
355 *orig_sfmcd = broadsheet_read_reg(par, 0x0204);
356 broadsheet_write_reg(par, 0x0208, 0);
357 broadsheet_write_reg(par, 0x0204, 0);
358 broadsheet_write_reg(par, 0x0204, ((3 << 3) | 1));
359
360 return 0;
361}
362
363static int broadsheet_spiflash_wait_for_bit(struct broadsheetfb_par *par,
364 u16 reg, int bitnum, int val,
365 int timeout)
366{
367 u16 tmp;
368
369 do {
370 tmp = broadsheet_read_reg(par, reg);
371 if (((tmp >> bitnum) & 1) == val)
372 return 0;
373 mdelay(1);
374 } while (timeout--);
375
376 return -ETIMEDOUT;
377}
378
379static int broadsheet_spiflash_write_byte(struct broadsheetfb_par *par, u8 data)
380{
381 broadsheet_write_reg(par, 0x0202, (data | 0x100));
382
383 return broadsheet_spiflash_wait_for_bit(par, 0x0206, 3, 0, 100);
384}
385
386static int broadsheet_spiflash_read_byte(struct broadsheetfb_par *par, u8 *data)
387{
388 int err;
389 u16 tmp;
390
391 broadsheet_write_reg(par, 0x0202, 0);
392
393 err = broadsheet_spiflash_wait_for_bit(par, 0x0206, 3, 0, 100);
394 if (err)
395 return err;
396
397 tmp = broadsheet_read_reg(par, 0x200);
398
399 *data = tmp & 0xFF;
400
401 return 0;
402}
403
404static int broadsheet_spiflash_wait_for_status(struct broadsheetfb_par *par,
405 int timeout)
406{
407 u8 tmp;
408 int err;
409
410 do {
411 broadsheet_write_reg(par, 0x0208, 1);
412
413 err = broadsheet_spiflash_write_byte(par, 0x05);
414 if (err)
415 goto failout;
416
417 err = broadsheet_spiflash_read_byte(par, &tmp);
418 if (err)
419 goto failout;
420
421 broadsheet_write_reg(par, 0x0208, 0);
422
423 if (!(tmp & 0x1))
424 return 0;
425
426 mdelay(5);
427 } while (timeout--);
428
429 dev_err(par->info->device, "Timed out waiting for spiflash status\n");
430 return -ETIMEDOUT;
431
432failout:
433 broadsheet_write_reg(par, 0x0208, 0);
434 return err;
435}
436
437static int broadsheet_spiflash_op_on_address(struct broadsheetfb_par *par,
438 u8 op, u32 addr)
439{
440 int i;
441 u8 tmp;
442 int err;
443
444 broadsheet_write_reg(par, 0x0208, 1);
445
446 err = broadsheet_spiflash_write_byte(par, op);
447 if (err)
448 return err;
449
450 for (i = 2; i >= 0; i--) {
451 tmp = ((addr >> (i * 8)) & 0xFF);
452 err = broadsheet_spiflash_write_byte(par, tmp);
453 if (err)
454 return err;
455 }
456
457 return err;
458}
459
460static int broadsheet_verify_spiflash(struct broadsheetfb_par *par,
461 int *flash_type)
462{
463 int err = 0;
464 u8 sig;
465
466 err = broadsheet_spiflash_op_on_address(par, 0xAB, 0x00000000);
467 if (err)
468 goto failout;
469
470 err = broadsheet_spiflash_read_byte(par, &sig);
471 if (err)
472 goto failout;
473
474 if ((sig != 0x10) && (sig != 0x11)) {
475 dev_err(par->info->device, "Unexpected flash type\n");
476 err = -EINVAL;
477 goto failout;
478 }
479
480 *flash_type = sig;
481
482failout:
483 broadsheet_write_reg(par, 0x0208, 0);
484 return err;
485}
486
487static int broadsheet_setup_for_wfm_write(struct broadsheetfb_par *par,
488 u16 *initial_sfmcd, int *flash_type)
489
490{
491 int err;
492
493 err = broadsheet_setup_plls(par);
494 if (err)
495 return err;
496
497 broadsheet_write_reg(par, 0x0106, 0x0203);
498
499 err = broadsheet_setup_spi(par);
500 if (err)
501 return err;
502
503 err = broadsheet_setup_spiflash(par, initial_sfmcd);
504 if (err)
505 return err;
506
507 return broadsheet_verify_spiflash(par, flash_type);
508}
509
510static int broadsheet_spiflash_write_control(struct broadsheetfb_par *par,
511 int mode)
512{
513 int err;
514
515 broadsheet_write_reg(par, 0x0208, 1);
516 if (mode)
517 err = broadsheet_spiflash_write_byte(par, 0x06);
518 else
519 err = broadsheet_spiflash_write_byte(par, 0x04);
520
521 broadsheet_write_reg(par, 0x0208, 0);
522 return err;
523}
524
525static int broadsheet_spiflash_erase_sector(struct broadsheetfb_par *par,
526 int addr)
527{
528 int err;
529
530 broadsheet_spiflash_write_control(par, 1);
531
532 err = broadsheet_spiflash_op_on_address(par, 0xD8, addr);
533
534 broadsheet_write_reg(par, 0x0208, 0);
535
536 if (err)
537 return err;
538
539 err = broadsheet_spiflash_wait_for_status(par, 1000);
540
541 return err;
542}
543
544static int broadsheet_spiflash_read_range(struct broadsheetfb_par *par,
545 int addr, int size, char *data)
546{
547 int err;
548 int i;
549
550 err = broadsheet_spiflash_op_on_address(par, 0x03, addr);
551 if (err)
552 goto failout;
553
554 for (i = 0; i < size; i++) {
555 err = broadsheet_spiflash_read_byte(par, &data[i]);
556 if (err)
557 goto failout;
558 }
559
560failout:
561 broadsheet_write_reg(par, 0x0208, 0);
562 return err;
563}
564
565#define BS_SPIFLASH_PAGE_SIZE 256
566static int broadsheet_spiflash_write_page(struct broadsheetfb_par *par,
567 int addr, const char *data)
568{
569 int err;
570 int i;
571
572 broadsheet_spiflash_write_control(par, 1);
573
574 err = broadsheet_spiflash_op_on_address(par, 0x02, addr);
575 if (err)
576 goto failout;
577
578 for (i = 0; i < BS_SPIFLASH_PAGE_SIZE; i++) {
579 err = broadsheet_spiflash_write_byte(par, data[i]);
580 if (err)
581 goto failout;
582 }
583
584 broadsheet_write_reg(par, 0x0208, 0);
585
586 err = broadsheet_spiflash_wait_for_status(par, 100);
587
588failout:
589 return err;
590}
591
592static int broadsheet_spiflash_write_sector(struct broadsheetfb_par *par,
593 int addr, const char *data, int sector_size)
594{
595 int i;
596 int err;
597
598 for (i = 0; i < sector_size; i += BS_SPIFLASH_PAGE_SIZE) {
599 err = broadsheet_spiflash_write_page(par, addr + i, &data[i]);
600 if (err)
601 return err;
602 }
603 return 0;
604}
605
606/*
607 * The caller must guarantee that the data to be rewritten is entirely
608 * contained within this sector. That is, data_start_addr + data_len
609 * must be less than sector_start_addr + sector_size.
610 */
611static int broadsheet_spiflash_rewrite_sector(struct broadsheetfb_par *par,
612 int sector_size, int data_start_addr,
613 int data_len, const char *data)
614{
615 int err;
616 char *sector_buffer;
617 int tail_start_addr;
618 int start_sector_addr;
619
620 sector_buffer = kzalloc(sector_size, GFP_KERNEL);
621 if (!sector_buffer)
622 return -ENOMEM;
623
624 /* the start address of the sector is the 0th byte of that sector */
625 start_sector_addr = (data_start_addr / sector_size) * sector_size;
626
627 /*
628 * check if there is head data that we need to readback into our sector
629 * buffer first
630 */
631 if (data_start_addr != start_sector_addr) {
632 /*
633 * we need to read every byte up till the start address of our
634 * data and we put it into our sector buffer.
635 */
636 err = broadsheet_spiflash_read_range(par, start_sector_addr,
637 data_start_addr, sector_buffer);
638 if (err)
639 goto out;
640 }
641
642 /* now we copy our data into the right place in the sector buffer */
643 memcpy(sector_buffer + data_start_addr, data, data_len);
644
645 /*
646 * now we check if there is a tail section of the sector that we need to
647 * readback.
648 */
649 tail_start_addr = (data_start_addr + data_len) % sector_size;
650
651 if (tail_start_addr) {
652 int tail_len;
653
654 tail_len = sector_size - tail_start_addr;
655
656 /* now we read this tail into our sector buffer */
657 err = broadsheet_spiflash_read_range(par, tail_start_addr,
658 tail_len, sector_buffer + tail_start_addr);
659 if (err)
660 goto out;
661 }
662
663 /* if we got here we have the full sector that we want to rewrite. */
664
665 /* first erase the sector */
666 err = broadsheet_spiflash_erase_sector(par, start_sector_addr);
667 if (err)
668 goto out;
669
670 /* now write it */
671 err = broadsheet_spiflash_write_sector(par, start_sector_addr,
672 sector_buffer, sector_size);
673out:
674 kfree(sector_buffer);
675 return err;
676}
677
678static int broadsheet_write_spiflash(struct broadsheetfb_par *par, u32 wfm_addr,
679 const u8 *wfm, int bytecount, int flash_type)
680{
681 int sector_size;
682 int err;
683 int cur_addr;
684 int writecount;
685 int maxlen;
686 int offset = 0;
687
688 switch (flash_type) {
689 case 0x10:
690 sector_size = 32*1024;
691 break;
692 case 0x11:
693 default:
694 sector_size = 64*1024;
695 break;
696 }
697
698 while (bytecount) {
699 cur_addr = wfm_addr + offset;
700 maxlen = roundup(cur_addr, sector_size) - cur_addr;
701 writecount = min(bytecount, maxlen);
702
703 err = broadsheet_spiflash_rewrite_sector(par, sector_size,
704 cur_addr, writecount, wfm + offset);
705 if (err)
706 return err;
707
708 offset += writecount;
709 bytecount -= writecount;
710 }
711
712 return 0;
713}
714
715static int broadsheet_store_waveform_to_spiflash(struct broadsheetfb_par *par,
716 const u8 *wfm, size_t wfm_size)
717{
718 int err = 0;
719 u16 initial_sfmcd = 0;
720 int flash_type = 0;
721
722 err = broadsheet_setup_for_wfm_write(par, &initial_sfmcd, &flash_type);
723 if (err)
724 goto failout;
725
726 err = broadsheet_write_spiflash(par, 0x886, wfm, wfm_size, flash_type);
727
728failout:
729 broadsheet_write_reg(par, 0x0204, initial_sfmcd);
730 return err;
731}
732
733static ssize_t broadsheet_loadstore_waveform(struct device *dev,
734 struct device_attribute *attr,
735 const char *buf, size_t len)
736{
737 int err;
738 struct fb_info *info = dev_get_drvdata(dev);
739 struct broadsheetfb_par *par = info->par;
740 const struct firmware *fw_entry;
741
742 if (len < 1)
743 return -EINVAL;
744
745 err = request_firmware(&fw_entry, "broadsheet.wbf", dev);
746 if (err < 0) {
747 dev_err(dev, "Failed to get broadsheet waveform\n");
748 goto err_failed;
749 }
750
751 /* try to enforce reasonable min max on waveform */
752 if ((fw_entry->size < 8*1024) || (fw_entry->size > 64*1024)) {
753 dev_err(dev, "Invalid waveform\n");
754 err = -EINVAL;
755 goto err_fw;
756 }
757
758 mutex_lock(&(par->io_lock));
759 err = broadsheet_store_waveform_to_spiflash(par, fw_entry->data,
760 fw_entry->size);
761
762 mutex_unlock(&(par->io_lock));
763 if (err < 0) {
764 dev_err(dev, "Failed to store broadsheet waveform\n");
765 goto err_fw;
766 }
767
768 dev_info(dev, "Stored broadsheet waveform, size %zd\n", fw_entry->size);
769
770 err = len;
771
772err_fw:
773 release_firmware(fw_entry);
774err_failed:
775 return err;
776}
777static DEVICE_ATTR(loadstore_waveform, S_IWUSR, NULL,
778 broadsheet_loadstore_waveform);
779
780/* upper level functions that manipulate the display and other stuff */
781static void broadsheet_init_display(struct broadsheetfb_par *par)
782{
783 u16 args[5];
784 int xres = par->info->var.xres;
785 int yres = par->info->var.yres;
786
787 args[0] = panel_table[par->panel_index].w;
788 args[1] = panel_table[par->panel_index].h;
789 args[2] = panel_table[par->panel_index].sdcfg;
790 args[3] = panel_table[par->panel_index].gdcfg;
791 args[4] = panel_table[par->panel_index].lutfmt;
792 broadsheet_send_cmdargs(par, BS_CMD_INIT_DSPE_CFG, 5, args);
793
794 /* did the controller really set it? */
795 broadsheet_send_cmdargs(par, BS_CMD_INIT_DSPE_CFG, 5, args);
796
797 args[0] = panel_table[par->panel_index].fsynclen;
798 args[1] = panel_table[par->panel_index].fendfbegin;
799 args[2] = panel_table[par->panel_index].lsynclen;
800 args[3] = panel_table[par->panel_index].lendlbegin;
801 args[4] = panel_table[par->panel_index].pixclk;
802 broadsheet_send_cmdargs(par, BS_CMD_INIT_DSPE_TMG, 5, args);
803
804 broadsheet_write_reg32(par, 0x310, xres*yres*2);
805
806 /* setup waveform */
807 args[0] = 0x886;
808 args[1] = 0;
809 broadsheet_send_cmdargs(par, BS_CMD_RD_WFM_INFO, 2, args);
810
811 broadsheet_send_command(par, BS_CMD_UPD_GDRV_CLR);
812
813 broadsheet_send_command(par, BS_CMD_WAIT_DSPE_TRG);
814
815 broadsheet_write_reg(par, 0x330, 0x84);
816
817 broadsheet_send_command(par, BS_CMD_WAIT_DSPE_TRG);
818
819 args[0] = (0x3 << 4);
820 broadsheet_send_cmdargs(par, BS_CMD_LD_IMG, 1, args);
821
822 args[0] = 0x154;
823 broadsheet_send_cmdargs(par, BS_CMD_WR_REG, 1, args);
824
825 broadsheet_burst_write(par, (panel_table[par->panel_index].w *
826 panel_table[par->panel_index].h)/2,
827 (u16 *)par->info->screen_buffer);
828
829 broadsheet_send_command(par, BS_CMD_LD_IMG_END);
830
831 args[0] = 0x4300;
832 broadsheet_send_cmdargs(par, BS_CMD_UPD_FULL, 1, args);
833
834 broadsheet_send_command(par, BS_CMD_WAIT_DSPE_TRG);
835
836 broadsheet_send_command(par, BS_CMD_WAIT_DSPE_FREND);
837
838 par->board->wait_for_rdy(par);
839}
840
841static void broadsheet_identify(struct broadsheetfb_par *par)
842{
843 u16 rev, prc;
844 struct device *dev = par->info->device;
845
846 rev = broadsheet_read_reg(par, BS_REG_REV);
847 prc = broadsheet_read_reg(par, BS_REG_PRC);
848 dev_info(dev, "Broadsheet Rev 0x%x, Product Code 0x%x\n", rev, prc);
849
850 if (prc != 0x0047)
851 dev_warn(dev, "Unrecognized Broadsheet Product Code\n");
852 if (rev != 0x0100)
853 dev_warn(dev, "Unrecognized Broadsheet Revision\n");
854}
855
856static void broadsheet_init(struct broadsheetfb_par *par)
857{
858 broadsheet_send_command(par, BS_CMD_INIT_SYS_RUN);
859 /* the controller needs a second */
860 msleep(1000);
861 broadsheet_init_display(par);
862}
863
864static void broadsheetfb_dpy_update_pages(struct broadsheetfb_par *par,
865 u16 y1, u16 y2)
866{
867 u16 args[5];
868 unsigned char *buf = par->info->screen_buffer;
869
870 mutex_lock(&(par->io_lock));
871 /* y1 must be a multiple of 4 so drop the lower bits */
872 y1 &= 0xFFFC;
873 /* y2 must be a multiple of 4 , but - 1 so up the lower bits */
874 y2 |= 0x0003;
875
876 args[0] = 0x3 << 4;
877 args[1] = 0;
878 args[2] = y1;
879 args[3] = cpu_to_le16(par->info->var.xres);
880 args[4] = y2;
881 broadsheet_send_cmdargs(par, BS_CMD_LD_IMG_AREA, 5, args);
882
883 args[0] = 0x154;
884 broadsheet_send_cmdargs(par, BS_CMD_WR_REG, 1, args);
885
886 buf += y1 * par->info->var.xres;
887 broadsheet_burst_write(par, ((1 + y2 - y1) * par->info->var.xres)/2,
888 (u16 *) buf);
889
890 broadsheet_send_command(par, BS_CMD_LD_IMG_END);
891
892 args[0] = 0x4300;
893 broadsheet_send_cmdargs(par, BS_CMD_UPD_FULL, 1, args);
894
895 broadsheet_send_command(par, BS_CMD_WAIT_DSPE_TRG);
896
897 broadsheet_send_command(par, BS_CMD_WAIT_DSPE_FREND);
898
899 par->board->wait_for_rdy(par);
900 mutex_unlock(&(par->io_lock));
901
902}
903
904static void broadsheetfb_dpy_update(struct broadsheetfb_par *par)
905{
906 u16 args[5];
907
908 mutex_lock(&(par->io_lock));
909 args[0] = 0x3 << 4;
910 broadsheet_send_cmdargs(par, BS_CMD_LD_IMG, 1, args);
911
912 args[0] = 0x154;
913 broadsheet_send_cmdargs(par, BS_CMD_WR_REG, 1, args);
914 broadsheet_burst_write(par, (panel_table[par->panel_index].w *
915 panel_table[par->panel_index].h)/2,
916 (u16 *)par->info->screen_buffer);
917
918 broadsheet_send_command(par, BS_CMD_LD_IMG_END);
919
920 args[0] = 0x4300;
921 broadsheet_send_cmdargs(par, BS_CMD_UPD_FULL, 1, args);
922
923 broadsheet_send_command(par, BS_CMD_WAIT_DSPE_TRG);
924
925 broadsheet_send_command(par, BS_CMD_WAIT_DSPE_FREND);
926
927 par->board->wait_for_rdy(par);
928 mutex_unlock(&(par->io_lock));
929}
930
931/* this is called back from the deferred io workqueue */
932static void broadsheetfb_dpy_deferred_io(struct fb_info *info, struct list_head *pagereflist)
933{
934 u16 y1 = 0, h = 0;
935 unsigned long prev_offset = ULONG_MAX;
936 struct fb_deferred_io_pageref *pageref;
937 int h_inc;
938 u16 yres = info->var.yres;
939 u16 xres = info->var.xres;
940
941 /* height increment is fixed per page */
942 h_inc = DIV_ROUND_UP(PAGE_SIZE , xres);
943
944 /* walk the written page list and swizzle the data */
945 list_for_each_entry(pageref, pagereflist, list) {
946 if (prev_offset == ULONG_MAX) {
947 /* just starting so assign first page */
948 y1 = pageref->offset / xres;
949 h = h_inc;
950 } else if ((prev_offset + PAGE_SIZE) == pageref->offset) {
951 /* this page is consecutive so increase our height */
952 h += h_inc;
953 } else {
954 /* page not consecutive, issue previous update first */
955 broadsheetfb_dpy_update_pages(info->par, y1, y1 + h);
956 /* start over with our non consecutive page */
957 y1 = pageref->offset / xres;
958 h = h_inc;
959 }
960 prev_offset = pageref->offset;
961 }
962
963 /* if we still have any pages to update we do so now */
964 if (h >= yres) {
965 /* its a full screen update, just do it */
966 broadsheetfb_dpy_update(info->par);
967 } else {
968 broadsheetfb_dpy_update_pages(info->par, y1,
969 min((u16) (y1 + h), yres));
970 }
971}
972
973static void broadsheetfb_defio_damage_range(struct fb_info *info, off_t off, size_t len)
974{
975 struct broadsheetfb_par *par = info->par;
976
977 broadsheetfb_dpy_update(par);
978}
979
980static void broadsheetfb_defio_damage_area(struct fb_info *info, u32 x, u32 y,
981 u32 width, u32 height)
982{
983 struct broadsheetfb_par *par = info->par;
984
985 broadsheetfb_dpy_update(par);
986}
987
988FB_GEN_DEFAULT_DEFERRED_SYSMEM_OPS(broadsheetfb,
989 broadsheetfb_defio_damage_range,
990 broadsheetfb_defio_damage_area)
991
992static const struct fb_ops broadsheetfb_ops = {
993 .owner = THIS_MODULE,
994 FB_DEFAULT_DEFERRED_OPS(broadsheetfb),
995};
996
997static struct fb_deferred_io broadsheetfb_defio = {
998 .delay = HZ/4,
999 .sort_pagereflist = true,
1000 .deferred_io = broadsheetfb_dpy_deferred_io,
1001};
1002
1003static int broadsheetfb_probe(struct platform_device *dev)
1004{
1005 struct fb_info *info;
1006 struct broadsheet_board *board;
1007 int retval = -ENOMEM;
1008 int videomemorysize;
1009 unsigned char *videomemory;
1010 struct broadsheetfb_par *par;
1011 int i;
1012 int dpyw, dpyh;
1013 int panel_index;
1014
1015 /* pick up board specific routines */
1016 board = dev->dev.platform_data;
1017 if (!board)
1018 return -EINVAL;
1019
1020 /* try to count device specific driver, if can't, platform recalls */
1021 if (!try_module_get(board->owner))
1022 return -ENODEV;
1023
1024 info = framebuffer_alloc(sizeof(struct broadsheetfb_par), &dev->dev);
1025 if (!info)
1026 goto err;
1027
1028 switch (board->get_panel_type()) {
1029 case 37:
1030 panel_index = 1;
1031 break;
1032 case 97:
1033 panel_index = 2;
1034 break;
1035 case 6:
1036 default:
1037 panel_index = 0;
1038 break;
1039 }
1040
1041 dpyw = panel_table[panel_index].w;
1042 dpyh = panel_table[panel_index].h;
1043
1044 videomemorysize = roundup((dpyw*dpyh), PAGE_SIZE);
1045
1046 videomemory = vzalloc(videomemorysize);
1047 if (!videomemory)
1048 goto err_fb_rel;
1049
1050 info->screen_buffer = videomemory;
1051 info->fbops = &broadsheetfb_ops;
1052
1053 broadsheetfb_var.xres = dpyw;
1054 broadsheetfb_var.yres = dpyh;
1055 broadsheetfb_var.xres_virtual = dpyw;
1056 broadsheetfb_var.yres_virtual = dpyh;
1057 info->var = broadsheetfb_var;
1058
1059 broadsheetfb_fix.line_length = dpyw;
1060 info->fix = broadsheetfb_fix;
1061 info->fix.smem_len = videomemorysize;
1062 par = info->par;
1063 par->panel_index = panel_index;
1064 par->info = info;
1065 par->board = board;
1066 par->write_reg = broadsheet_write_reg;
1067 par->read_reg = broadsheet_read_reg;
1068 init_waitqueue_head(&par->waitq);
1069
1070 mutex_init(&par->io_lock);
1071
1072 info->flags = FBINFO_VIRTFB;
1073
1074 info->fbdefio = &broadsheetfb_defio;
1075 retval = fb_deferred_io_init(info);
1076 if (retval)
1077 goto err_vfree;
1078
1079 retval = fb_alloc_cmap(&info->cmap, 16, 0);
1080 if (retval < 0) {
1081 dev_err(&dev->dev, "Failed to allocate colormap\n");
1082 goto err_fbdefio;
1083 }
1084
1085 /* set cmap */
1086 for (i = 0; i < 16; i++)
1087 info->cmap.red[i] = (((2*i)+1)*(0xFFFF))/32;
1088 memcpy(info->cmap.green, info->cmap.red, sizeof(u16)*16);
1089 memcpy(info->cmap.blue, info->cmap.red, sizeof(u16)*16);
1090
1091 retval = par->board->setup_irq(info);
1092 if (retval < 0)
1093 goto err_cmap;
1094
1095 /* this inits the dpy */
1096 retval = board->init(par);
1097 if (retval < 0)
1098 goto err_free_irq;
1099
1100 broadsheet_identify(par);
1101
1102 broadsheet_init(par);
1103
1104 retval = register_framebuffer(info);
1105 if (retval < 0)
1106 goto err_free_irq;
1107
1108 platform_set_drvdata(dev, info);
1109
1110 retval = device_create_file(&dev->dev, &dev_attr_loadstore_waveform);
1111 if (retval < 0)
1112 goto err_unreg_fb;
1113
1114 fb_info(info, "Broadsheet frame buffer, using %dK of video memory\n",
1115 videomemorysize >> 10);
1116
1117
1118 return 0;
1119
1120err_unreg_fb:
1121 unregister_framebuffer(info);
1122err_free_irq:
1123 board->cleanup(par);
1124err_cmap:
1125 fb_dealloc_cmap(&info->cmap);
1126err_fbdefio:
1127 fb_deferred_io_cleanup(info);
1128err_vfree:
1129 vfree(videomemory);
1130err_fb_rel:
1131 framebuffer_release(info);
1132err:
1133 module_put(board->owner);
1134 return retval;
1135
1136}
1137
1138static void broadsheetfb_remove(struct platform_device *dev)
1139{
1140 struct fb_info *info = platform_get_drvdata(dev);
1141
1142 if (info) {
1143 struct broadsheetfb_par *par = info->par;
1144
1145 device_remove_file(info->device, &dev_attr_loadstore_waveform);
1146 unregister_framebuffer(info);
1147 fb_deferred_io_cleanup(info);
1148 par->board->cleanup(par);
1149 fb_dealloc_cmap(&info->cmap);
1150 vfree(info->screen_buffer);
1151 module_put(par->board->owner);
1152 framebuffer_release(info);
1153 }
1154}
1155
1156static struct platform_driver broadsheetfb_driver = {
1157 .probe = broadsheetfb_probe,
1158 .remove = broadsheetfb_remove,
1159 .driver = {
1160 .name = "broadsheetfb",
1161 },
1162};
1163module_platform_driver(broadsheetfb_driver);
1164
1165MODULE_DESCRIPTION("fbdev driver for Broadsheet controller");
1166MODULE_AUTHOR("Jaya Kumar");
1167MODULE_LICENSE("GPL");
1168
1169MODULE_FIRMWARE("broadsheet.wbf");