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Merge branch 'omap-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[mirror_ubuntu-artful-kernel.git] / drivers / video / sh_mobile_lcdcfb.c
1 /*
2 * SuperH Mobile LCDC Framebuffer
3 *
4 * Copyright (c) 2008 Magnus Damm
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
8 * for more details.
9 */
10
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/delay.h>
14 #include <linux/mm.h>
15 #include <linux/fb.h>
16 #include <linux/clk.h>
17 #include <linux/pm_runtime.h>
18 #include <linux/platform_device.h>
19 #include <linux/dma-mapping.h>
20 #include <linux/interrupt.h>
21 #include <linux/vmalloc.h>
22 #include <video/sh_mobile_lcdc.h>
23 #include <asm/atomic.h>
24
25 #define PALETTE_NR 16
26 #define SIDE_B_OFFSET 0x1000
27 #define MIRROR_OFFSET 0x2000
28
29 /* shared registers */
30 #define _LDDCKR 0x410
31 #define _LDDCKSTPR 0x414
32 #define _LDINTR 0x468
33 #define _LDSR 0x46c
34 #define _LDCNT1R 0x470
35 #define _LDCNT2R 0x474
36 #define _LDRCNTR 0x478
37 #define _LDDDSR 0x47c
38 #define _LDDWD0R 0x800
39 #define _LDDRDR 0x840
40 #define _LDDWAR 0x900
41 #define _LDDRAR 0x904
42
43 /* shared registers and their order for context save/restore */
44 static int lcdc_shared_regs[] = {
45 _LDDCKR,
46 _LDDCKSTPR,
47 _LDINTR,
48 _LDDDSR,
49 _LDCNT1R,
50 _LDCNT2R,
51 };
52 #define NR_SHARED_REGS ARRAY_SIZE(lcdc_shared_regs)
53
54 /* per-channel registers */
55 enum { LDDCKPAT1R, LDDCKPAT2R, LDMT1R, LDMT2R, LDMT3R, LDDFR, LDSM1R,
56 LDSM2R, LDSA1R, LDMLSR, LDHCNR, LDHSYNR, LDVLNR, LDVSYNR, LDPMR,
57 NR_CH_REGS };
58
59 static unsigned long lcdc_offs_mainlcd[NR_CH_REGS] = {
60 [LDDCKPAT1R] = 0x400,
61 [LDDCKPAT2R] = 0x404,
62 [LDMT1R] = 0x418,
63 [LDMT2R] = 0x41c,
64 [LDMT3R] = 0x420,
65 [LDDFR] = 0x424,
66 [LDSM1R] = 0x428,
67 [LDSM2R] = 0x42c,
68 [LDSA1R] = 0x430,
69 [LDMLSR] = 0x438,
70 [LDHCNR] = 0x448,
71 [LDHSYNR] = 0x44c,
72 [LDVLNR] = 0x450,
73 [LDVSYNR] = 0x454,
74 [LDPMR] = 0x460,
75 };
76
77 static unsigned long lcdc_offs_sublcd[NR_CH_REGS] = {
78 [LDDCKPAT1R] = 0x408,
79 [LDDCKPAT2R] = 0x40c,
80 [LDMT1R] = 0x600,
81 [LDMT2R] = 0x604,
82 [LDMT3R] = 0x608,
83 [LDDFR] = 0x60c,
84 [LDSM1R] = 0x610,
85 [LDSM2R] = 0x614,
86 [LDSA1R] = 0x618,
87 [LDMLSR] = 0x620,
88 [LDHCNR] = 0x624,
89 [LDHSYNR] = 0x628,
90 [LDVLNR] = 0x62c,
91 [LDVSYNR] = 0x630,
92 [LDPMR] = 0x63c,
93 };
94
95 #define START_LCDC 0x00000001
96 #define LCDC_RESET 0x00000100
97 #define DISPLAY_BEU 0x00000008
98 #define LCDC_ENABLE 0x00000001
99 #define LDINTR_FE 0x00000400
100 #define LDINTR_VSE 0x00000200
101 #define LDINTR_VEE 0x00000100
102 #define LDINTR_FS 0x00000004
103 #define LDINTR_VSS 0x00000002
104 #define LDINTR_VES 0x00000001
105 #define LDRCNTR_SRS 0x00020000
106 #define LDRCNTR_SRC 0x00010000
107 #define LDRCNTR_MRS 0x00000002
108 #define LDRCNTR_MRC 0x00000001
109
110 struct sh_mobile_lcdc_priv;
111 struct sh_mobile_lcdc_chan {
112 struct sh_mobile_lcdc_priv *lcdc;
113 unsigned long *reg_offs;
114 unsigned long ldmt1r_value;
115 unsigned long enabled; /* ME and SE in LDCNT2R */
116 struct sh_mobile_lcdc_chan_cfg cfg;
117 u32 pseudo_palette[PALETTE_NR];
118 unsigned long saved_ch_regs[NR_CH_REGS];
119 struct fb_info *info;
120 dma_addr_t dma_handle;
121 struct fb_deferred_io defio;
122 struct scatterlist *sglist;
123 unsigned long frame_end;
124 unsigned long pan_offset;
125 unsigned long new_pan_offset;
126 wait_queue_head_t frame_end_wait;
127 };
128
129 struct sh_mobile_lcdc_priv {
130 void __iomem *base;
131 int irq;
132 atomic_t hw_usecnt;
133 struct device *dev;
134 struct clk *dot_clk;
135 unsigned long lddckr;
136 struct sh_mobile_lcdc_chan ch[2];
137 unsigned long saved_shared_regs[NR_SHARED_REGS];
138 int started;
139 };
140
141 static bool banked(int reg_nr)
142 {
143 switch (reg_nr) {
144 case LDMT1R:
145 case LDMT2R:
146 case LDMT3R:
147 case LDDFR:
148 case LDSM1R:
149 case LDSA1R:
150 case LDMLSR:
151 case LDHCNR:
152 case LDHSYNR:
153 case LDVLNR:
154 case LDVSYNR:
155 return true;
156 }
157 return false;
158 }
159
160 static void lcdc_write_chan(struct sh_mobile_lcdc_chan *chan,
161 int reg_nr, unsigned long data)
162 {
163 iowrite32(data, chan->lcdc->base + chan->reg_offs[reg_nr]);
164 if (banked(reg_nr))
165 iowrite32(data, chan->lcdc->base + chan->reg_offs[reg_nr] +
166 SIDE_B_OFFSET);
167 }
168
169 static void lcdc_write_chan_mirror(struct sh_mobile_lcdc_chan *chan,
170 int reg_nr, unsigned long data)
171 {
172 iowrite32(data, chan->lcdc->base + chan->reg_offs[reg_nr] +
173 MIRROR_OFFSET);
174 }
175
176 static unsigned long lcdc_read_chan(struct sh_mobile_lcdc_chan *chan,
177 int reg_nr)
178 {
179 return ioread32(chan->lcdc->base + chan->reg_offs[reg_nr]);
180 }
181
182 static void lcdc_write(struct sh_mobile_lcdc_priv *priv,
183 unsigned long reg_offs, unsigned long data)
184 {
185 iowrite32(data, priv->base + reg_offs);
186 }
187
188 static unsigned long lcdc_read(struct sh_mobile_lcdc_priv *priv,
189 unsigned long reg_offs)
190 {
191 return ioread32(priv->base + reg_offs);
192 }
193
194 static void lcdc_wait_bit(struct sh_mobile_lcdc_priv *priv,
195 unsigned long reg_offs,
196 unsigned long mask, unsigned long until)
197 {
198 while ((lcdc_read(priv, reg_offs) & mask) != until)
199 cpu_relax();
200 }
201
202 static int lcdc_chan_is_sublcd(struct sh_mobile_lcdc_chan *chan)
203 {
204 return chan->cfg.chan == LCDC_CHAN_SUBLCD;
205 }
206
207 static void lcdc_sys_write_index(void *handle, unsigned long data)
208 {
209 struct sh_mobile_lcdc_chan *ch = handle;
210
211 lcdc_write(ch->lcdc, _LDDWD0R, data | 0x10000000);
212 lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
213 lcdc_write(ch->lcdc, _LDDWAR, 1 | (lcdc_chan_is_sublcd(ch) ? 2 : 0));
214 lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
215 }
216
217 static void lcdc_sys_write_data(void *handle, unsigned long data)
218 {
219 struct sh_mobile_lcdc_chan *ch = handle;
220
221 lcdc_write(ch->lcdc, _LDDWD0R, data | 0x11000000);
222 lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
223 lcdc_write(ch->lcdc, _LDDWAR, 1 | (lcdc_chan_is_sublcd(ch) ? 2 : 0));
224 lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
225 }
226
227 static unsigned long lcdc_sys_read_data(void *handle)
228 {
229 struct sh_mobile_lcdc_chan *ch = handle;
230
231 lcdc_write(ch->lcdc, _LDDRDR, 0x01000000);
232 lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
233 lcdc_write(ch->lcdc, _LDDRAR, 1 | (lcdc_chan_is_sublcd(ch) ? 2 : 0));
234 udelay(1);
235 lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
236
237 return lcdc_read(ch->lcdc, _LDDRDR) & 0x3ffff;
238 }
239
240 struct sh_mobile_lcdc_sys_bus_ops sh_mobile_lcdc_sys_bus_ops = {
241 lcdc_sys_write_index,
242 lcdc_sys_write_data,
243 lcdc_sys_read_data,
244 };
245
246 static void sh_mobile_lcdc_clk_on(struct sh_mobile_lcdc_priv *priv)
247 {
248 if (atomic_inc_and_test(&priv->hw_usecnt)) {
249 pm_runtime_get_sync(priv->dev);
250 if (priv->dot_clk)
251 clk_enable(priv->dot_clk);
252 }
253 }
254
255 static void sh_mobile_lcdc_clk_off(struct sh_mobile_lcdc_priv *priv)
256 {
257 if (atomic_sub_return(1, &priv->hw_usecnt) == -1) {
258 if (priv->dot_clk)
259 clk_disable(priv->dot_clk);
260 pm_runtime_put(priv->dev);
261 }
262 }
263
264 static int sh_mobile_lcdc_sginit(struct fb_info *info,
265 struct list_head *pagelist)
266 {
267 struct sh_mobile_lcdc_chan *ch = info->par;
268 unsigned int nr_pages_max = info->fix.smem_len >> PAGE_SHIFT;
269 struct page *page;
270 int nr_pages = 0;
271
272 sg_init_table(ch->sglist, nr_pages_max);
273
274 list_for_each_entry(page, pagelist, lru)
275 sg_set_page(&ch->sglist[nr_pages++], page, PAGE_SIZE, 0);
276
277 return nr_pages;
278 }
279
280 static void sh_mobile_lcdc_deferred_io(struct fb_info *info,
281 struct list_head *pagelist)
282 {
283 struct sh_mobile_lcdc_chan *ch = info->par;
284 struct sh_mobile_lcdc_board_cfg *bcfg = &ch->cfg.board_cfg;
285
286 /* enable clocks before accessing hardware */
287 sh_mobile_lcdc_clk_on(ch->lcdc);
288
289 /*
290 * It's possible to get here without anything on the pagelist via
291 * sh_mobile_lcdc_deferred_io_touch() or via a userspace fsync()
292 * invocation. In the former case, the acceleration routines are
293 * stepped in to when using the framebuffer console causing the
294 * workqueue to be scheduled without any dirty pages on the list.
295 *
296 * Despite this, a panel update is still needed given that the
297 * acceleration routines have their own methods for writing in
298 * that still need to be updated.
299 *
300 * The fsync() and empty pagelist case could be optimized for,
301 * but we don't bother, as any application exhibiting such
302 * behaviour is fundamentally broken anyways.
303 */
304 if (!list_empty(pagelist)) {
305 unsigned int nr_pages = sh_mobile_lcdc_sginit(info, pagelist);
306
307 /* trigger panel update */
308 dma_map_sg(info->dev, ch->sglist, nr_pages, DMA_TO_DEVICE);
309 if (bcfg->start_transfer)
310 bcfg->start_transfer(bcfg->board_data, ch,
311 &sh_mobile_lcdc_sys_bus_ops);
312 lcdc_write_chan(ch, LDSM2R, 1);
313 dma_unmap_sg(info->dev, ch->sglist, nr_pages, DMA_TO_DEVICE);
314 } else {
315 if (bcfg->start_transfer)
316 bcfg->start_transfer(bcfg->board_data, ch,
317 &sh_mobile_lcdc_sys_bus_ops);
318 lcdc_write_chan(ch, LDSM2R, 1);
319 }
320 }
321
322 static void sh_mobile_lcdc_deferred_io_touch(struct fb_info *info)
323 {
324 struct fb_deferred_io *fbdefio = info->fbdefio;
325
326 if (fbdefio)
327 schedule_delayed_work(&info->deferred_work, fbdefio->delay);
328 }
329
330 static irqreturn_t sh_mobile_lcdc_irq(int irq, void *data)
331 {
332 struct sh_mobile_lcdc_priv *priv = data;
333 struct sh_mobile_lcdc_chan *ch;
334 unsigned long tmp;
335 unsigned long ldintr;
336 int is_sub;
337 int k;
338
339 /* acknowledge interrupt */
340 ldintr = tmp = lcdc_read(priv, _LDINTR);
341 /*
342 * disable further VSYNC End IRQs, preserve all other enabled IRQs,
343 * write 0 to bits 0-6 to ack all triggered IRQs.
344 */
345 tmp &= 0xffffff00 & ~LDINTR_VEE;
346 lcdc_write(priv, _LDINTR, tmp);
347
348 /* figure out if this interrupt is for main or sub lcd */
349 is_sub = (lcdc_read(priv, _LDSR) & (1 << 10)) ? 1 : 0;
350
351 /* wake up channel and disable clocks */
352 for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
353 ch = &priv->ch[k];
354
355 if (!ch->enabled)
356 continue;
357
358 /* Frame Start */
359 if (ldintr & LDINTR_FS) {
360 if (is_sub == lcdc_chan_is_sublcd(ch)) {
361 ch->frame_end = 1;
362 wake_up(&ch->frame_end_wait);
363
364 sh_mobile_lcdc_clk_off(priv);
365 }
366 }
367
368 /* VSYNC End */
369 if (ldintr & LDINTR_VES) {
370 unsigned long ldrcntr = lcdc_read(priv, _LDRCNTR);
371 /* Set the source address for the next refresh */
372 lcdc_write_chan_mirror(ch, LDSA1R, ch->dma_handle +
373 ch->new_pan_offset);
374 if (lcdc_chan_is_sublcd(ch))
375 lcdc_write(ch->lcdc, _LDRCNTR,
376 ldrcntr ^ LDRCNTR_SRS);
377 else
378 lcdc_write(ch->lcdc, _LDRCNTR,
379 ldrcntr ^ LDRCNTR_MRS);
380 ch->pan_offset = ch->new_pan_offset;
381 }
382 }
383
384 return IRQ_HANDLED;
385 }
386
387 static void sh_mobile_lcdc_start_stop(struct sh_mobile_lcdc_priv *priv,
388 int start)
389 {
390 unsigned long tmp = lcdc_read(priv, _LDCNT2R);
391 int k;
392
393 /* start or stop the lcdc */
394 if (start)
395 lcdc_write(priv, _LDCNT2R, tmp | START_LCDC);
396 else
397 lcdc_write(priv, _LDCNT2R, tmp & ~START_LCDC);
398
399 /* wait until power is applied/stopped on all channels */
400 for (k = 0; k < ARRAY_SIZE(priv->ch); k++)
401 if (lcdc_read(priv, _LDCNT2R) & priv->ch[k].enabled)
402 while (1) {
403 tmp = lcdc_read_chan(&priv->ch[k], LDPMR) & 3;
404 if (start && tmp == 3)
405 break;
406 if (!start && tmp == 0)
407 break;
408 cpu_relax();
409 }
410
411 if (!start)
412 lcdc_write(priv, _LDDCKSTPR, 1); /* stop dotclock */
413 }
414
415 static int sh_mobile_lcdc_start(struct sh_mobile_lcdc_priv *priv)
416 {
417 struct sh_mobile_lcdc_chan *ch;
418 struct fb_videomode *lcd_cfg;
419 struct sh_mobile_lcdc_board_cfg *board_cfg;
420 unsigned long tmp;
421 int k, m;
422 int ret = 0;
423
424 /* enable clocks before accessing the hardware */
425 for (k = 0; k < ARRAY_SIZE(priv->ch); k++)
426 if (priv->ch[k].enabled)
427 sh_mobile_lcdc_clk_on(priv);
428
429 /* reset */
430 lcdc_write(priv, _LDCNT2R, lcdc_read(priv, _LDCNT2R) | LCDC_RESET);
431 lcdc_wait_bit(priv, _LDCNT2R, LCDC_RESET, 0);
432
433 /* enable LCDC channels */
434 tmp = lcdc_read(priv, _LDCNT2R);
435 tmp |= priv->ch[0].enabled;
436 tmp |= priv->ch[1].enabled;
437 lcdc_write(priv, _LDCNT2R, tmp);
438
439 /* read data from external memory, avoid using the BEU for now */
440 lcdc_write(priv, _LDCNT2R, lcdc_read(priv, _LDCNT2R) & ~DISPLAY_BEU);
441
442 /* stop the lcdc first */
443 sh_mobile_lcdc_start_stop(priv, 0);
444
445 /* configure clocks */
446 tmp = priv->lddckr;
447 for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
448 ch = &priv->ch[k];
449
450 if (!priv->ch[k].enabled)
451 continue;
452
453 m = ch->cfg.clock_divider;
454 if (!m)
455 continue;
456
457 if (m == 1)
458 m = 1 << 6;
459 tmp |= m << (lcdc_chan_is_sublcd(ch) ? 8 : 0);
460
461 lcdc_write_chan(ch, LDDCKPAT1R, 0x00000000);
462 lcdc_write_chan(ch, LDDCKPAT2R, (1 << (m/2)) - 1);
463 }
464
465 lcdc_write(priv, _LDDCKR, tmp);
466
467 /* start dotclock again */
468 lcdc_write(priv, _LDDCKSTPR, 0);
469 lcdc_wait_bit(priv, _LDDCKSTPR, ~0, 0);
470
471 /* interrupts are disabled to begin with */
472 lcdc_write(priv, _LDINTR, 0);
473
474 for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
475 ch = &priv->ch[k];
476 lcd_cfg = &ch->cfg.lcd_cfg;
477
478 if (!ch->enabled)
479 continue;
480
481 tmp = ch->ldmt1r_value;
482 tmp |= (lcd_cfg->sync & FB_SYNC_VERT_HIGH_ACT) ? 0 : 1 << 28;
483 tmp |= (lcd_cfg->sync & FB_SYNC_HOR_HIGH_ACT) ? 0 : 1 << 27;
484 tmp |= (ch->cfg.flags & LCDC_FLAGS_DWPOL) ? 1 << 26 : 0;
485 tmp |= (ch->cfg.flags & LCDC_FLAGS_DIPOL) ? 1 << 25 : 0;
486 tmp |= (ch->cfg.flags & LCDC_FLAGS_DAPOL) ? 1 << 24 : 0;
487 tmp |= (ch->cfg.flags & LCDC_FLAGS_HSCNT) ? 1 << 17 : 0;
488 tmp |= (ch->cfg.flags & LCDC_FLAGS_DWCNT) ? 1 << 16 : 0;
489 lcdc_write_chan(ch, LDMT1R, tmp);
490
491 /* setup SYS bus */
492 lcdc_write_chan(ch, LDMT2R, ch->cfg.sys_bus_cfg.ldmt2r);
493 lcdc_write_chan(ch, LDMT3R, ch->cfg.sys_bus_cfg.ldmt3r);
494
495 /* horizontal configuration */
496 tmp = lcd_cfg->xres + lcd_cfg->hsync_len;
497 tmp += lcd_cfg->left_margin;
498 tmp += lcd_cfg->right_margin;
499 tmp /= 8; /* HTCN */
500 tmp |= (lcd_cfg->xres / 8) << 16; /* HDCN */
501 lcdc_write_chan(ch, LDHCNR, tmp);
502
503 tmp = lcd_cfg->xres;
504 tmp += lcd_cfg->right_margin;
505 tmp /= 8; /* HSYNP */
506 tmp |= (lcd_cfg->hsync_len / 8) << 16; /* HSYNW */
507 lcdc_write_chan(ch, LDHSYNR, tmp);
508
509 /* power supply */
510 lcdc_write_chan(ch, LDPMR, 0);
511
512 /* vertical configuration */
513 tmp = lcd_cfg->yres + lcd_cfg->vsync_len;
514 tmp += lcd_cfg->upper_margin;
515 tmp += lcd_cfg->lower_margin; /* VTLN */
516 tmp |= lcd_cfg->yres << 16; /* VDLN */
517 lcdc_write_chan(ch, LDVLNR, tmp);
518
519 tmp = lcd_cfg->yres;
520 tmp += lcd_cfg->lower_margin; /* VSYNP */
521 tmp |= lcd_cfg->vsync_len << 16; /* VSYNW */
522 lcdc_write_chan(ch, LDVSYNR, tmp);
523
524 board_cfg = &ch->cfg.board_cfg;
525 if (board_cfg->setup_sys)
526 ret = board_cfg->setup_sys(board_cfg->board_data, ch,
527 &sh_mobile_lcdc_sys_bus_ops);
528 if (ret)
529 return ret;
530 }
531
532 /* word and long word swap */
533 lcdc_write(priv, _LDDDSR, lcdc_read(priv, _LDDDSR) | 6);
534
535 for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
536 ch = &priv->ch[k];
537
538 if (!priv->ch[k].enabled)
539 continue;
540
541 /* set bpp format in PKF[4:0] */
542 tmp = lcdc_read_chan(ch, LDDFR);
543 tmp &= ~(0x0001001f);
544 tmp |= (ch->info->var.bits_per_pixel == 16) ? 3 : 0;
545 lcdc_write_chan(ch, LDDFR, tmp);
546
547 /* point out our frame buffer */
548 lcdc_write_chan(ch, LDSA1R, ch->info->fix.smem_start);
549
550 /* set line size */
551 lcdc_write_chan(ch, LDMLSR, ch->info->fix.line_length);
552
553 /* setup deferred io if SYS bus */
554 tmp = ch->cfg.sys_bus_cfg.deferred_io_msec;
555 if (ch->ldmt1r_value & (1 << 12) && tmp) {
556 ch->defio.deferred_io = sh_mobile_lcdc_deferred_io;
557 ch->defio.delay = msecs_to_jiffies(tmp);
558 ch->info->fbdefio = &ch->defio;
559 fb_deferred_io_init(ch->info);
560
561 /* one-shot mode */
562 lcdc_write_chan(ch, LDSM1R, 1);
563
564 /* enable "Frame End Interrupt Enable" bit */
565 lcdc_write(priv, _LDINTR, LDINTR_FE);
566
567 } else {
568 /* continuous read mode */
569 lcdc_write_chan(ch, LDSM1R, 0);
570 }
571 }
572
573 /* display output */
574 lcdc_write(priv, _LDCNT1R, LCDC_ENABLE);
575
576 /* start the lcdc */
577 sh_mobile_lcdc_start_stop(priv, 1);
578 priv->started = 1;
579
580 /* tell the board code to enable the panel */
581 for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
582 ch = &priv->ch[k];
583 if (!ch->enabled)
584 continue;
585
586 board_cfg = &ch->cfg.board_cfg;
587 if (board_cfg->display_on)
588 board_cfg->display_on(board_cfg->board_data);
589 }
590
591 return 0;
592 }
593
594 static void sh_mobile_lcdc_stop(struct sh_mobile_lcdc_priv *priv)
595 {
596 struct sh_mobile_lcdc_chan *ch;
597 struct sh_mobile_lcdc_board_cfg *board_cfg;
598 int k;
599
600 /* clean up deferred io and ask board code to disable panel */
601 for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
602 ch = &priv->ch[k];
603 if (!ch->enabled)
604 continue;
605
606 /* deferred io mode:
607 * flush frame, and wait for frame end interrupt
608 * clean up deferred io and enable clock
609 */
610 if (ch->info->fbdefio) {
611 ch->frame_end = 0;
612 schedule_delayed_work(&ch->info->deferred_work, 0);
613 wait_event(ch->frame_end_wait, ch->frame_end);
614 fb_deferred_io_cleanup(ch->info);
615 ch->info->fbdefio = NULL;
616 sh_mobile_lcdc_clk_on(priv);
617 }
618
619 board_cfg = &ch->cfg.board_cfg;
620 if (board_cfg->display_off)
621 board_cfg->display_off(board_cfg->board_data);
622 }
623
624 /* stop the lcdc */
625 if (priv->started) {
626 sh_mobile_lcdc_start_stop(priv, 0);
627 priv->started = 0;
628 }
629
630 /* stop clocks */
631 for (k = 0; k < ARRAY_SIZE(priv->ch); k++)
632 if (priv->ch[k].enabled)
633 sh_mobile_lcdc_clk_off(priv);
634 }
635
636 static int sh_mobile_lcdc_check_interface(struct sh_mobile_lcdc_chan *ch)
637 {
638 int ifm, miftyp;
639
640 switch (ch->cfg.interface_type) {
641 case RGB8: ifm = 0; miftyp = 0; break;
642 case RGB9: ifm = 0; miftyp = 4; break;
643 case RGB12A: ifm = 0; miftyp = 5; break;
644 case RGB12B: ifm = 0; miftyp = 6; break;
645 case RGB16: ifm = 0; miftyp = 7; break;
646 case RGB18: ifm = 0; miftyp = 10; break;
647 case RGB24: ifm = 0; miftyp = 11; break;
648 case SYS8A: ifm = 1; miftyp = 0; break;
649 case SYS8B: ifm = 1; miftyp = 1; break;
650 case SYS8C: ifm = 1; miftyp = 2; break;
651 case SYS8D: ifm = 1; miftyp = 3; break;
652 case SYS9: ifm = 1; miftyp = 4; break;
653 case SYS12: ifm = 1; miftyp = 5; break;
654 case SYS16A: ifm = 1; miftyp = 7; break;
655 case SYS16B: ifm = 1; miftyp = 8; break;
656 case SYS16C: ifm = 1; miftyp = 9; break;
657 case SYS18: ifm = 1; miftyp = 10; break;
658 case SYS24: ifm = 1; miftyp = 11; break;
659 default: goto bad;
660 }
661
662 /* SUBLCD only supports SYS interface */
663 if (lcdc_chan_is_sublcd(ch)) {
664 if (ifm == 0)
665 goto bad;
666 else
667 ifm = 0;
668 }
669
670 ch->ldmt1r_value = (ifm << 12) | miftyp;
671 return 0;
672 bad:
673 return -EINVAL;
674 }
675
676 static int sh_mobile_lcdc_setup_clocks(struct platform_device *pdev,
677 int clock_source,
678 struct sh_mobile_lcdc_priv *priv)
679 {
680 char *str;
681 int icksel;
682
683 switch (clock_source) {
684 case LCDC_CLK_BUS: str = "bus_clk"; icksel = 0; break;
685 case LCDC_CLK_PERIPHERAL: str = "peripheral_clk"; icksel = 1; break;
686 case LCDC_CLK_EXTERNAL: str = NULL; icksel = 2; break;
687 default:
688 return -EINVAL;
689 }
690
691 priv->lddckr = icksel << 16;
692
693 if (str) {
694 priv->dot_clk = clk_get(&pdev->dev, str);
695 if (IS_ERR(priv->dot_clk)) {
696 dev_err(&pdev->dev, "cannot get dot clock %s\n", str);
697 return PTR_ERR(priv->dot_clk);
698 }
699 }
700 atomic_set(&priv->hw_usecnt, -1);
701
702 /* Runtime PM support involves two step for this driver:
703 * 1) Enable Runtime PM
704 * 2) Force Runtime PM Resume since hardware is accessed from probe()
705 */
706 pm_runtime_enable(priv->dev);
707 pm_runtime_resume(priv->dev);
708 return 0;
709 }
710
711 static int sh_mobile_lcdc_setcolreg(u_int regno,
712 u_int red, u_int green, u_int blue,
713 u_int transp, struct fb_info *info)
714 {
715 u32 *palette = info->pseudo_palette;
716
717 if (regno >= PALETTE_NR)
718 return -EINVAL;
719
720 /* only FB_VISUAL_TRUECOLOR supported */
721
722 red >>= 16 - info->var.red.length;
723 green >>= 16 - info->var.green.length;
724 blue >>= 16 - info->var.blue.length;
725 transp >>= 16 - info->var.transp.length;
726
727 palette[regno] = (red << info->var.red.offset) |
728 (green << info->var.green.offset) |
729 (blue << info->var.blue.offset) |
730 (transp << info->var.transp.offset);
731
732 return 0;
733 }
734
735 static struct fb_fix_screeninfo sh_mobile_lcdc_fix = {
736 .id = "SH Mobile LCDC",
737 .type = FB_TYPE_PACKED_PIXELS,
738 .visual = FB_VISUAL_TRUECOLOR,
739 .accel = FB_ACCEL_NONE,
740 .xpanstep = 0,
741 .ypanstep = 1,
742 .ywrapstep = 0,
743 };
744
745 static void sh_mobile_lcdc_fillrect(struct fb_info *info,
746 const struct fb_fillrect *rect)
747 {
748 sys_fillrect(info, rect);
749 sh_mobile_lcdc_deferred_io_touch(info);
750 }
751
752 static void sh_mobile_lcdc_copyarea(struct fb_info *info,
753 const struct fb_copyarea *area)
754 {
755 sys_copyarea(info, area);
756 sh_mobile_lcdc_deferred_io_touch(info);
757 }
758
759 static void sh_mobile_lcdc_imageblit(struct fb_info *info,
760 const struct fb_image *image)
761 {
762 sys_imageblit(info, image);
763 sh_mobile_lcdc_deferred_io_touch(info);
764 }
765
766 static int sh_mobile_fb_pan_display(struct fb_var_screeninfo *var,
767 struct fb_info *info)
768 {
769 struct sh_mobile_lcdc_chan *ch = info->par;
770
771 if (info->var.xoffset == var->xoffset &&
772 info->var.yoffset == var->yoffset)
773 return 0; /* No change, do nothing */
774
775 ch->new_pan_offset = (var->yoffset * info->fix.line_length) +
776 (var->xoffset * (info->var.bits_per_pixel / 8));
777
778 if (ch->new_pan_offset != ch->pan_offset) {
779 unsigned long ldintr;
780 ldintr = lcdc_read(ch->lcdc, _LDINTR);
781 ldintr |= LDINTR_VEE;
782 lcdc_write(ch->lcdc, _LDINTR, ldintr);
783 sh_mobile_lcdc_deferred_io_touch(info);
784 }
785
786 return 0;
787 }
788
789 static struct fb_ops sh_mobile_lcdc_ops = {
790 .owner = THIS_MODULE,
791 .fb_setcolreg = sh_mobile_lcdc_setcolreg,
792 .fb_read = fb_sys_read,
793 .fb_write = fb_sys_write,
794 .fb_fillrect = sh_mobile_lcdc_fillrect,
795 .fb_copyarea = sh_mobile_lcdc_copyarea,
796 .fb_imageblit = sh_mobile_lcdc_imageblit,
797 .fb_pan_display = sh_mobile_fb_pan_display,
798 };
799
800 static int sh_mobile_lcdc_set_bpp(struct fb_var_screeninfo *var, int bpp)
801 {
802 switch (bpp) {
803 case 16: /* PKF[4:0] = 00011 - RGB 565 */
804 var->red.offset = 11;
805 var->red.length = 5;
806 var->green.offset = 5;
807 var->green.length = 6;
808 var->blue.offset = 0;
809 var->blue.length = 5;
810 var->transp.offset = 0;
811 var->transp.length = 0;
812 break;
813
814 case 32: /* PKF[4:0] = 00000 - RGB 888
815 * sh7722 pdf says 00RRGGBB but reality is GGBB00RR
816 * this may be because LDDDSR has word swap enabled..
817 */
818 var->red.offset = 0;
819 var->red.length = 8;
820 var->green.offset = 24;
821 var->green.length = 8;
822 var->blue.offset = 16;
823 var->blue.length = 8;
824 var->transp.offset = 0;
825 var->transp.length = 0;
826 break;
827 default:
828 return -EINVAL;
829 }
830 var->bits_per_pixel = bpp;
831 var->red.msb_right = 0;
832 var->green.msb_right = 0;
833 var->blue.msb_right = 0;
834 var->transp.msb_right = 0;
835 return 0;
836 }
837
838 static int sh_mobile_lcdc_suspend(struct device *dev)
839 {
840 struct platform_device *pdev = to_platform_device(dev);
841
842 sh_mobile_lcdc_stop(platform_get_drvdata(pdev));
843 return 0;
844 }
845
846 static int sh_mobile_lcdc_resume(struct device *dev)
847 {
848 struct platform_device *pdev = to_platform_device(dev);
849
850 return sh_mobile_lcdc_start(platform_get_drvdata(pdev));
851 }
852
853 static int sh_mobile_lcdc_runtime_suspend(struct device *dev)
854 {
855 struct platform_device *pdev = to_platform_device(dev);
856 struct sh_mobile_lcdc_priv *p = platform_get_drvdata(pdev);
857 struct sh_mobile_lcdc_chan *ch;
858 int k, n;
859
860 /* save per-channel registers */
861 for (k = 0; k < ARRAY_SIZE(p->ch); k++) {
862 ch = &p->ch[k];
863 if (!ch->enabled)
864 continue;
865 for (n = 0; n < NR_CH_REGS; n++)
866 ch->saved_ch_regs[n] = lcdc_read_chan(ch, n);
867 }
868
869 /* save shared registers */
870 for (n = 0; n < NR_SHARED_REGS; n++)
871 p->saved_shared_regs[n] = lcdc_read(p, lcdc_shared_regs[n]);
872
873 /* turn off LCDC hardware */
874 lcdc_write(p, _LDCNT1R, 0);
875 return 0;
876 }
877
878 static int sh_mobile_lcdc_runtime_resume(struct device *dev)
879 {
880 struct platform_device *pdev = to_platform_device(dev);
881 struct sh_mobile_lcdc_priv *p = platform_get_drvdata(pdev);
882 struct sh_mobile_lcdc_chan *ch;
883 int k, n;
884
885 /* restore per-channel registers */
886 for (k = 0; k < ARRAY_SIZE(p->ch); k++) {
887 ch = &p->ch[k];
888 if (!ch->enabled)
889 continue;
890 for (n = 0; n < NR_CH_REGS; n++)
891 lcdc_write_chan(ch, n, ch->saved_ch_regs[n]);
892 }
893
894 /* restore shared registers */
895 for (n = 0; n < NR_SHARED_REGS; n++)
896 lcdc_write(p, lcdc_shared_regs[n], p->saved_shared_regs[n]);
897
898 return 0;
899 }
900
901 static const struct dev_pm_ops sh_mobile_lcdc_dev_pm_ops = {
902 .suspend = sh_mobile_lcdc_suspend,
903 .resume = sh_mobile_lcdc_resume,
904 .runtime_suspend = sh_mobile_lcdc_runtime_suspend,
905 .runtime_resume = sh_mobile_lcdc_runtime_resume,
906 };
907
908 static int sh_mobile_lcdc_remove(struct platform_device *pdev);
909
910 static int __init sh_mobile_lcdc_probe(struct platform_device *pdev)
911 {
912 struct fb_info *info;
913 struct sh_mobile_lcdc_priv *priv;
914 struct sh_mobile_lcdc_info *pdata;
915 struct sh_mobile_lcdc_chan_cfg *cfg;
916 struct resource *res;
917 int error;
918 void *buf;
919 int i, j;
920
921 if (!pdev->dev.platform_data) {
922 dev_err(&pdev->dev, "no platform data defined\n");
923 error = -EINVAL;
924 goto err0;
925 }
926
927 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
928 i = platform_get_irq(pdev, 0);
929 if (!res || i < 0) {
930 dev_err(&pdev->dev, "cannot get platform resources\n");
931 error = -ENOENT;
932 goto err0;
933 }
934
935 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
936 if (!priv) {
937 dev_err(&pdev->dev, "cannot allocate device data\n");
938 error = -ENOMEM;
939 goto err0;
940 }
941
942 error = request_irq(i, sh_mobile_lcdc_irq, IRQF_DISABLED,
943 dev_name(&pdev->dev), priv);
944 if (error) {
945 dev_err(&pdev->dev, "unable to request irq\n");
946 goto err1;
947 }
948
949 priv->irq = i;
950 priv->dev = &pdev->dev;
951 platform_set_drvdata(pdev, priv);
952 pdata = pdev->dev.platform_data;
953
954 j = 0;
955 for (i = 0; i < ARRAY_SIZE(pdata->ch); i++) {
956 priv->ch[j].lcdc = priv;
957 memcpy(&priv->ch[j].cfg, &pdata->ch[i], sizeof(pdata->ch[i]));
958
959 error = sh_mobile_lcdc_check_interface(&priv->ch[i]);
960 if (error) {
961 dev_err(&pdev->dev, "unsupported interface type\n");
962 goto err1;
963 }
964 init_waitqueue_head(&priv->ch[i].frame_end_wait);
965 priv->ch[j].pan_offset = 0;
966 priv->ch[j].new_pan_offset = 0;
967
968 switch (pdata->ch[i].chan) {
969 case LCDC_CHAN_MAINLCD:
970 priv->ch[j].enabled = 1 << 1;
971 priv->ch[j].reg_offs = lcdc_offs_mainlcd;
972 j++;
973 break;
974 case LCDC_CHAN_SUBLCD:
975 priv->ch[j].enabled = 1 << 2;
976 priv->ch[j].reg_offs = lcdc_offs_sublcd;
977 j++;
978 break;
979 }
980 }
981
982 if (!j) {
983 dev_err(&pdev->dev, "no channels defined\n");
984 error = -EINVAL;
985 goto err1;
986 }
987
988 error = sh_mobile_lcdc_setup_clocks(pdev, pdata->clock_source, priv);
989 if (error) {
990 dev_err(&pdev->dev, "unable to setup clocks\n");
991 goto err1;
992 }
993
994 priv->base = ioremap_nocache(res->start, (res->end - res->start) + 1);
995
996 for (i = 0; i < j; i++) {
997 cfg = &priv->ch[i].cfg;
998
999 priv->ch[i].info = framebuffer_alloc(0, &pdev->dev);
1000 if (!priv->ch[i].info) {
1001 dev_err(&pdev->dev, "unable to allocate fb_info\n");
1002 error = -ENOMEM;
1003 break;
1004 }
1005
1006 info = priv->ch[i].info;
1007 info->fbops = &sh_mobile_lcdc_ops;
1008 info->var.xres = info->var.xres_virtual = cfg->lcd_cfg.xres;
1009 info->var.yres = cfg->lcd_cfg.yres;
1010 /* Default Y virtual resolution is 2x panel size */
1011 info->var.yres_virtual = info->var.yres * 2;
1012 info->var.width = cfg->lcd_size_cfg.width;
1013 info->var.height = cfg->lcd_size_cfg.height;
1014 info->var.activate = FB_ACTIVATE_NOW;
1015 error = sh_mobile_lcdc_set_bpp(&info->var, cfg->bpp);
1016 if (error)
1017 break;
1018
1019 info->fix = sh_mobile_lcdc_fix;
1020 info->fix.line_length = cfg->lcd_cfg.xres * (cfg->bpp / 8);
1021 info->fix.smem_len = info->fix.line_length *
1022 info->var.yres_virtual;
1023
1024 buf = dma_alloc_coherent(&pdev->dev, info->fix.smem_len,
1025 &priv->ch[i].dma_handle, GFP_KERNEL);
1026 if (!buf) {
1027 dev_err(&pdev->dev, "unable to allocate buffer\n");
1028 error = -ENOMEM;
1029 break;
1030 }
1031
1032 info->pseudo_palette = &priv->ch[i].pseudo_palette;
1033 info->flags = FBINFO_FLAG_DEFAULT;
1034
1035 error = fb_alloc_cmap(&info->cmap, PALETTE_NR, 0);
1036 if (error < 0) {
1037 dev_err(&pdev->dev, "unable to allocate cmap\n");
1038 dma_free_coherent(&pdev->dev, info->fix.smem_len,
1039 buf, priv->ch[i].dma_handle);
1040 break;
1041 }
1042
1043 memset(buf, 0, info->fix.smem_len);
1044 info->fix.smem_start = priv->ch[i].dma_handle;
1045 info->screen_base = buf;
1046 info->device = &pdev->dev;
1047 info->par = &priv->ch[i];
1048 }
1049
1050 if (error)
1051 goto err1;
1052
1053 error = sh_mobile_lcdc_start(priv);
1054 if (error) {
1055 dev_err(&pdev->dev, "unable to start hardware\n");
1056 goto err1;
1057 }
1058
1059 for (i = 0; i < j; i++) {
1060 struct sh_mobile_lcdc_chan *ch = priv->ch + i;
1061
1062 info = ch->info;
1063
1064 if (info->fbdefio) {
1065 priv->ch->sglist = vmalloc(sizeof(struct scatterlist) *
1066 info->fix.smem_len >> PAGE_SHIFT);
1067 if (!priv->ch->sglist) {
1068 dev_err(&pdev->dev, "cannot allocate sglist\n");
1069 goto err1;
1070 }
1071 }
1072
1073 error = register_framebuffer(info);
1074 if (error < 0)
1075 goto err1;
1076
1077 dev_info(info->dev,
1078 "registered %s/%s as %dx%d %dbpp.\n",
1079 pdev->name,
1080 (ch->cfg.chan == LCDC_CHAN_MAINLCD) ?
1081 "mainlcd" : "sublcd",
1082 (int) ch->cfg.lcd_cfg.xres,
1083 (int) ch->cfg.lcd_cfg.yres,
1084 ch->cfg.bpp);
1085
1086 /* deferred io mode: disable clock to save power */
1087 if (info->fbdefio)
1088 sh_mobile_lcdc_clk_off(priv);
1089 }
1090
1091 return 0;
1092 err1:
1093 sh_mobile_lcdc_remove(pdev);
1094 err0:
1095 return error;
1096 }
1097
1098 static int sh_mobile_lcdc_remove(struct platform_device *pdev)
1099 {
1100 struct sh_mobile_lcdc_priv *priv = platform_get_drvdata(pdev);
1101 struct fb_info *info;
1102 int i;
1103
1104 for (i = 0; i < ARRAY_SIZE(priv->ch); i++)
1105 if (priv->ch[i].info->dev)
1106 unregister_framebuffer(priv->ch[i].info);
1107
1108 sh_mobile_lcdc_stop(priv);
1109
1110 for (i = 0; i < ARRAY_SIZE(priv->ch); i++) {
1111 info = priv->ch[i].info;
1112
1113 if (!info || !info->device)
1114 continue;
1115
1116 if (priv->ch[i].sglist)
1117 vfree(priv->ch[i].sglist);
1118
1119 dma_free_coherent(&pdev->dev, info->fix.smem_len,
1120 info->screen_base, priv->ch[i].dma_handle);
1121 fb_dealloc_cmap(&info->cmap);
1122 framebuffer_release(info);
1123 }
1124
1125 if (priv->dot_clk)
1126 clk_put(priv->dot_clk);
1127
1128 pm_runtime_disable(priv->dev);
1129
1130 if (priv->base)
1131 iounmap(priv->base);
1132
1133 if (priv->irq)
1134 free_irq(priv->irq, priv);
1135 kfree(priv);
1136 return 0;
1137 }
1138
1139 static struct platform_driver sh_mobile_lcdc_driver = {
1140 .driver = {
1141 .name = "sh_mobile_lcdc_fb",
1142 .owner = THIS_MODULE,
1143 .pm = &sh_mobile_lcdc_dev_pm_ops,
1144 },
1145 .probe = sh_mobile_lcdc_probe,
1146 .remove = sh_mobile_lcdc_remove,
1147 };
1148
1149 static int __init sh_mobile_lcdc_init(void)
1150 {
1151 return platform_driver_register(&sh_mobile_lcdc_driver);
1152 }
1153
1154 static void __exit sh_mobile_lcdc_exit(void)
1155 {
1156 platform_driver_unregister(&sh_mobile_lcdc_driver);
1157 }
1158
1159 module_init(sh_mobile_lcdc_init);
1160 module_exit(sh_mobile_lcdc_exit);
1161
1162 MODULE_DESCRIPTION("SuperH Mobile LCDC Framebuffer driver");
1163 MODULE_AUTHOR("Magnus Damm <damm@opensource.se>");
1164 MODULE_LICENSE("GPL v2");
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