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backlight: 88pm860x_bl - potential memory leak
[wandboard.git] / drivers / video / sh_mobile_lcdcfb.c
blobe8c769944812e90a81b7d0cf8bdbe5d3f5525fc8
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 <linux/ioctl.h>
23 #include <linux/slab.h>
24 #include <video/sh_mobile_lcdc.h>
25 #include <asm/atomic.h>
26
27 #define PALETTE_NR 16
28 #define SIDE_B_OFFSET 0x1000
29 #define MIRROR_OFFSET 0x2000
30
31 /* shared registers */
32 #define _LDDCKR 0x410
33 #define _LDDCKSTPR 0x414
34 #define _LDINTR 0x468
35 #define _LDSR 0x46c
36 #define _LDCNT1R 0x470
37 #define _LDCNT2R 0x474
38 #define _LDRCNTR 0x478
39 #define _LDDDSR 0x47c
40 #define _LDDWD0R 0x800
41 #define _LDDRDR 0x840
42 #define _LDDWAR 0x900
43 #define _LDDRAR 0x904
44
45 /* shared registers and their order for context save/restore */
46 static int lcdc_shared_regs[] = {
47 _LDDCKR,
48 _LDDCKSTPR,
49 _LDINTR,
50 _LDDDSR,
51 _LDCNT1R,
52 _LDCNT2R,
53 };
54 #define NR_SHARED_REGS ARRAY_SIZE(lcdc_shared_regs)
55
56 /* per-channel registers */
57 enum { LDDCKPAT1R, LDDCKPAT2R, LDMT1R, LDMT2R, LDMT3R, LDDFR, LDSM1R,
58 LDSM2R, LDSA1R, LDMLSR, LDHCNR, LDHSYNR, LDVLNR, LDVSYNR, LDPMR,
59 NR_CH_REGS };
60
61 static unsigned long lcdc_offs_mainlcd[NR_CH_REGS] = {
62 [LDDCKPAT1R] = 0x400,
63 [LDDCKPAT2R] = 0x404,
64 [LDMT1R] = 0x418,
65 [LDMT2R] = 0x41c,
66 [LDMT3R] = 0x420,
67 [LDDFR] = 0x424,
68 [LDSM1R] = 0x428,
69 [LDSM2R] = 0x42c,
70 [LDSA1R] = 0x430,
71 [LDMLSR] = 0x438,
72 [LDHCNR] = 0x448,
73 [LDHSYNR] = 0x44c,
74 [LDVLNR] = 0x450,
75 [LDVSYNR] = 0x454,
76 [LDPMR] = 0x460,
77 };
78
79 static unsigned long lcdc_offs_sublcd[NR_CH_REGS] = {
80 [LDDCKPAT1R] = 0x408,
81 [LDDCKPAT2R] = 0x40c,
82 [LDMT1R] = 0x600,
83 [LDMT2R] = 0x604,
84 [LDMT3R] = 0x608,
85 [LDDFR] = 0x60c,
86 [LDSM1R] = 0x610,
87 [LDSM2R] = 0x614,
88 [LDSA1R] = 0x618,
89 [LDMLSR] = 0x620,
90 [LDHCNR] = 0x624,
91 [LDHSYNR] = 0x628,
92 [LDVLNR] = 0x62c,
93 [LDVSYNR] = 0x630,
94 [LDPMR] = 0x63c,
95 };
96
97 #define START_LCDC 0x00000001
98 #define LCDC_RESET 0x00000100
99 #define DISPLAY_BEU 0x00000008
100 #define LCDC_ENABLE 0x00000001
101 #define LDINTR_FE 0x00000400
102 #define LDINTR_VSE 0x00000200
103 #define LDINTR_VEE 0x00000100
104 #define LDINTR_FS 0x00000004
105 #define LDINTR_VSS 0x00000002
106 #define LDINTR_VES 0x00000001
107 #define LDRCNTR_SRS 0x00020000
108 #define LDRCNTR_SRC 0x00010000
109 #define LDRCNTR_MRS 0x00000002
110 #define LDRCNTR_MRC 0x00000001
111 #define LDSR_MRS 0x00000100
112
113 struct sh_mobile_lcdc_priv;
114 struct sh_mobile_lcdc_chan {
115 struct sh_mobile_lcdc_priv *lcdc;
116 unsigned long *reg_offs;
117 unsigned long ldmt1r_value;
118 unsigned long enabled; /* ME and SE in LDCNT2R */
119 struct sh_mobile_lcdc_chan_cfg cfg;
120 u32 pseudo_palette[PALETTE_NR];
121 unsigned long saved_ch_regs[NR_CH_REGS];
122 struct fb_info *info;
123 dma_addr_t dma_handle;
124 struct fb_deferred_io defio;
125 struct scatterlist *sglist;
126 unsigned long frame_end;
127 unsigned long pan_offset;
128 wait_queue_head_t frame_end_wait;
129 struct completion vsync_completion;
130 };
131
132 struct sh_mobile_lcdc_priv {
133 void __iomem *base;
134 int irq;
135 atomic_t hw_usecnt;
136 struct device *dev;
137 struct clk *dot_clk;
138 unsigned long lddckr;
139 struct sh_mobile_lcdc_chan ch[2];
140 unsigned long saved_shared_regs[NR_SHARED_REGS];
141 int started;
142 };
143
144 static bool banked(int reg_nr)
145 {
146 switch (reg_nr) {
147 case LDMT1R:
148 case LDMT2R:
149 case LDMT3R:
150 case LDDFR:
151 case LDSM1R:
152 case LDSA1R:
153 case LDMLSR:
154 case LDHCNR:
155 case LDHSYNR:
156 case LDVLNR:
157 case LDVSYNR:
158 return true;
159 }
160 return false;
161 }
162
163 static void lcdc_write_chan(struct sh_mobile_lcdc_chan *chan,
164 int reg_nr, unsigned long data)
165 {
166 iowrite32(data, chan->lcdc->base + chan->reg_offs[reg_nr]);
167 if (banked(reg_nr))
168 iowrite32(data, chan->lcdc->base + chan->reg_offs[reg_nr] +
169 SIDE_B_OFFSET);
170 }
171
172 static void lcdc_write_chan_mirror(struct sh_mobile_lcdc_chan *chan,
173 int reg_nr, unsigned long data)
174 {
175 iowrite32(data, chan->lcdc->base + chan->reg_offs[reg_nr] +
176 MIRROR_OFFSET);
177 }
178
179 static unsigned long lcdc_read_chan(struct sh_mobile_lcdc_chan *chan,
180 int reg_nr)
181 {
182 return ioread32(chan->lcdc->base + chan->reg_offs[reg_nr]);
183 }
184
185 static void lcdc_write(struct sh_mobile_lcdc_priv *priv,
186 unsigned long reg_offs, unsigned long data)
187 {
188 iowrite32(data, priv->base + reg_offs);
189 }
190
191 static unsigned long lcdc_read(struct sh_mobile_lcdc_priv *priv,
192 unsigned long reg_offs)
193 {
194 return ioread32(priv->base + reg_offs);
195 }
196
197 static void lcdc_wait_bit(struct sh_mobile_lcdc_priv *priv,
198 unsigned long reg_offs,
199 unsigned long mask, unsigned long until)
200 {
201 while ((lcdc_read(priv, reg_offs) & mask) != until)
202 cpu_relax();
203 }
204
205 static int lcdc_chan_is_sublcd(struct sh_mobile_lcdc_chan *chan)
206 {
207 return chan->cfg.chan == LCDC_CHAN_SUBLCD;
208 }
209
210 static void lcdc_sys_write_index(void *handle, unsigned long data)
211 {
212 struct sh_mobile_lcdc_chan *ch = handle;
213
214 lcdc_write(ch->lcdc, _LDDWD0R, data | 0x10000000);
215 lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
216 lcdc_write(ch->lcdc, _LDDWAR, 1 | (lcdc_chan_is_sublcd(ch) ? 2 : 0));
217 lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
218 }
219
220 static void lcdc_sys_write_data(void *handle, unsigned long data)
221 {
222 struct sh_mobile_lcdc_chan *ch = handle;
223
224 lcdc_write(ch->lcdc, _LDDWD0R, data | 0x11000000);
225 lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
226 lcdc_write(ch->lcdc, _LDDWAR, 1 | (lcdc_chan_is_sublcd(ch) ? 2 : 0));
227 lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
228 }
229
230 static unsigned long lcdc_sys_read_data(void *handle)
231 {
232 struct sh_mobile_lcdc_chan *ch = handle;
233
234 lcdc_write(ch->lcdc, _LDDRDR, 0x01000000);
235 lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
236 lcdc_write(ch->lcdc, _LDDRAR, 1 | (lcdc_chan_is_sublcd(ch) ? 2 : 0));
237 udelay(1);
238 lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
239
240 return lcdc_read(ch->lcdc, _LDDRDR) & 0x3ffff;
241 }
242
243 struct sh_mobile_lcdc_sys_bus_ops sh_mobile_lcdc_sys_bus_ops = {
244 lcdc_sys_write_index,
245 lcdc_sys_write_data,
246 lcdc_sys_read_data,
247 };
248
249 static void sh_mobile_lcdc_clk_on(struct sh_mobile_lcdc_priv *priv)
250 {
251 if (atomic_inc_and_test(&priv->hw_usecnt)) {
252 pm_runtime_get_sync(priv->dev);
253 if (priv->dot_clk)
254 clk_enable(priv->dot_clk);
255 }
256 }
257
258 static void sh_mobile_lcdc_clk_off(struct sh_mobile_lcdc_priv *priv)
259 {
260 if (atomic_sub_return(1, &priv->hw_usecnt) == -1) {
261 if (priv->dot_clk)
262 clk_disable(priv->dot_clk);
263 pm_runtime_put(priv->dev);
264 }
265 }
266
267 static int sh_mobile_lcdc_sginit(struct fb_info *info,
268 struct list_head *pagelist)
269 {
270 struct sh_mobile_lcdc_chan *ch = info->par;
271 unsigned int nr_pages_max = info->fix.smem_len >> PAGE_SHIFT;
272 struct page *page;
273 int nr_pages = 0;
274
275 sg_init_table(ch->sglist, nr_pages_max);
276
277 list_for_each_entry(page, pagelist, lru)
278 sg_set_page(&ch->sglist[nr_pages++], page, PAGE_SIZE, 0);
279
280 return nr_pages;
281 }
282
283 static void sh_mobile_lcdc_deferred_io(struct fb_info *info,
284 struct list_head *pagelist)
285 {
286 struct sh_mobile_lcdc_chan *ch = info->par;
287 struct sh_mobile_lcdc_board_cfg *bcfg = &ch->cfg.board_cfg;
288
289 /* enable clocks before accessing hardware */
290 sh_mobile_lcdc_clk_on(ch->lcdc);
291
292 /*
293 * It's possible to get here without anything on the pagelist via
294 * sh_mobile_lcdc_deferred_io_touch() or via a userspace fsync()
295 * invocation. In the former case, the acceleration routines are
296 * stepped in to when using the framebuffer console causing the
297 * workqueue to be scheduled without any dirty pages on the list.
298 *
299 * Despite this, a panel update is still needed given that the
300 * acceleration routines have their own methods for writing in
301 * that still need to be updated.
302 *
303 * The fsync() and empty pagelist case could be optimized for,
304 * but we don't bother, as any application exhibiting such
305 * behaviour is fundamentally broken anyways.
306 */
307 if (!list_empty(pagelist)) {
308 unsigned int nr_pages = sh_mobile_lcdc_sginit(info, pagelist);
309
310 /* trigger panel update */
311 dma_map_sg(info->dev, ch->sglist, nr_pages, DMA_TO_DEVICE);
312 if (bcfg->start_transfer)
313 bcfg->start_transfer(bcfg->board_data, ch,
314 &sh_mobile_lcdc_sys_bus_ops);
315 lcdc_write_chan(ch, LDSM2R, 1);
316 dma_unmap_sg(info->dev, ch->sglist, nr_pages, DMA_TO_DEVICE);
317 } else {
318 if (bcfg->start_transfer)
319 bcfg->start_transfer(bcfg->board_data, ch,
320 &sh_mobile_lcdc_sys_bus_ops);
321 lcdc_write_chan(ch, LDSM2R, 1);
322 }
323 }
324
325 static void sh_mobile_lcdc_deferred_io_touch(struct fb_info *info)
326 {
327 struct fb_deferred_io *fbdefio = info->fbdefio;
328
329 if (fbdefio)
330 schedule_delayed_work(&info->deferred_work, fbdefio->delay);
331 }
332
333 static irqreturn_t sh_mobile_lcdc_irq(int irq, void *data)
334 {
335 struct sh_mobile_lcdc_priv *priv = data;
336 struct sh_mobile_lcdc_chan *ch;
337 unsigned long tmp;
338 unsigned long ldintr;
339 int is_sub;
340 int k;
341
342 /* acknowledge interrupt */
343 ldintr = tmp = lcdc_read(priv, _LDINTR);
344 /*
345 * disable further VSYNC End IRQs, preserve all other enabled IRQs,
346 * write 0 to bits 0-6 to ack all triggered IRQs.
347 */
348 tmp &= 0xffffff00 & ~LDINTR_VEE;
349 lcdc_write(priv, _LDINTR, tmp);
350
351 /* figure out if this interrupt is for main or sub lcd */
352 is_sub = (lcdc_read(priv, _LDSR) & (1 << 10)) ? 1 : 0;
353
354 /* wake up channel and disable clocks */
355 for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
356 ch = &priv->ch[k];
357
358 if (!ch->enabled)
359 continue;
360
361 /* Frame Start */
362 if (ldintr & LDINTR_FS) {
363 if (is_sub == lcdc_chan_is_sublcd(ch)) {
364 ch->frame_end = 1;
365 wake_up(&ch->frame_end_wait);
366
367 sh_mobile_lcdc_clk_off(priv);
368 }
369 }
370
371 /* VSYNC End */
372 if (ldintr & LDINTR_VES)
373 complete(&ch->vsync_completion);
374 }
375
376 return IRQ_HANDLED;
377 }
378
379 static void sh_mobile_lcdc_start_stop(struct sh_mobile_lcdc_priv *priv,
380 int start)
381 {
382 unsigned long tmp = lcdc_read(priv, _LDCNT2R);
383 int k;
384
385 /* start or stop the lcdc */
386 if (start)
387 lcdc_write(priv, _LDCNT2R, tmp | START_LCDC);
388 else
389 lcdc_write(priv, _LDCNT2R, tmp & ~START_LCDC);
390
391 /* wait until power is applied/stopped on all channels */
392 for (k = 0; k < ARRAY_SIZE(priv->ch); k++)
393 if (lcdc_read(priv, _LDCNT2R) & priv->ch[k].enabled)
394 while (1) {
395 tmp = lcdc_read_chan(&priv->ch[k], LDPMR) & 3;
396 if (start && tmp == 3)
397 break;
398 if (!start && tmp == 0)
399 break;
400 cpu_relax();
401 }
402
403 if (!start)
404 lcdc_write(priv, _LDDCKSTPR, 1); /* stop dotclock */
405 }
406
407 static int sh_mobile_lcdc_start(struct sh_mobile_lcdc_priv *priv)
408 {
409 struct sh_mobile_lcdc_chan *ch;
410 struct fb_videomode *lcd_cfg;
411 struct sh_mobile_lcdc_board_cfg *board_cfg;
412 unsigned long tmp;
413 int k, m;
414 int ret = 0;
415
416 /* enable clocks before accessing the hardware */
417 for (k = 0; k < ARRAY_SIZE(priv->ch); k++)
418 if (priv->ch[k].enabled)
419 sh_mobile_lcdc_clk_on(priv);
420
421 /* reset */
422 lcdc_write(priv, _LDCNT2R, lcdc_read(priv, _LDCNT2R) | LCDC_RESET);
423 lcdc_wait_bit(priv, _LDCNT2R, LCDC_RESET, 0);
424
425 /* enable LCDC channels */
426 tmp = lcdc_read(priv, _LDCNT2R);
427 tmp |= priv->ch[0].enabled;
428 tmp |= priv->ch[1].enabled;
429 lcdc_write(priv, _LDCNT2R, tmp);
430
431 /* read data from external memory, avoid using the BEU for now */
432 lcdc_write(priv, _LDCNT2R, lcdc_read(priv, _LDCNT2R) & ~DISPLAY_BEU);
433
434 /* stop the lcdc first */
435 sh_mobile_lcdc_start_stop(priv, 0);
436
437 /* configure clocks */
438 tmp = priv->lddckr;
439 for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
440 ch = &priv->ch[k];
441
442 if (!priv->ch[k].enabled)
443 continue;
444
445 m = ch->cfg.clock_divider;
446 if (!m)
447 continue;
448
449 if (m == 1)
450 m = 1 << 6;
451 tmp |= m << (lcdc_chan_is_sublcd(ch) ? 8 : 0);
452
453 lcdc_write_chan(ch, LDDCKPAT1R, 0x00000000);
454 lcdc_write_chan(ch, LDDCKPAT2R, (1 << (m/2)) - 1);
455 }
456
457 lcdc_write(priv, _LDDCKR, tmp);
458
459 /* start dotclock again */
460 lcdc_write(priv, _LDDCKSTPR, 0);
461 lcdc_wait_bit(priv, _LDDCKSTPR, ~0, 0);
462
463 /* interrupts are disabled to begin with */
464 lcdc_write(priv, _LDINTR, 0);
465
466 for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
467 ch = &priv->ch[k];
468 lcd_cfg = &ch->cfg.lcd_cfg;
469
470 if (!ch->enabled)
471 continue;
472
473 tmp = ch->ldmt1r_value;
474 tmp |= (lcd_cfg->sync & FB_SYNC_VERT_HIGH_ACT) ? 0 : 1 << 28;
475 tmp |= (lcd_cfg->sync & FB_SYNC_HOR_HIGH_ACT) ? 0 : 1 << 27;
476 tmp |= (ch->cfg.flags & LCDC_FLAGS_DWPOL) ? 1 << 26 : 0;
477 tmp |= (ch->cfg.flags & LCDC_FLAGS_DIPOL) ? 1 << 25 : 0;
478 tmp |= (ch->cfg.flags & LCDC_FLAGS_DAPOL) ? 1 << 24 : 0;
479 tmp |= (ch->cfg.flags & LCDC_FLAGS_HSCNT) ? 1 << 17 : 0;
480 tmp |= (ch->cfg.flags & LCDC_FLAGS_DWCNT) ? 1 << 16 : 0;
481 lcdc_write_chan(ch, LDMT1R, tmp);
482
483 /* setup SYS bus */
484 lcdc_write_chan(ch, LDMT2R, ch->cfg.sys_bus_cfg.ldmt2r);
485 lcdc_write_chan(ch, LDMT3R, ch->cfg.sys_bus_cfg.ldmt3r);
486
487 /* horizontal configuration */
488 tmp = lcd_cfg->xres + lcd_cfg->hsync_len;
489 tmp += lcd_cfg->left_margin;
490 tmp += lcd_cfg->right_margin;
491 tmp /= 8; /* HTCN */
492 tmp |= (lcd_cfg->xres / 8) << 16; /* HDCN */
493 lcdc_write_chan(ch, LDHCNR, tmp);
494
495 tmp = lcd_cfg->xres;
496 tmp += lcd_cfg->right_margin;
497 tmp /= 8; /* HSYNP */
498 tmp |= (lcd_cfg->hsync_len / 8) << 16; /* HSYNW */
499 lcdc_write_chan(ch, LDHSYNR, tmp);
500
501 /* power supply */
502 lcdc_write_chan(ch, LDPMR, 0);
503
504 /* vertical configuration */
505 tmp = lcd_cfg->yres + lcd_cfg->vsync_len;
506 tmp += lcd_cfg->upper_margin;
507 tmp += lcd_cfg->lower_margin; /* VTLN */
508 tmp |= lcd_cfg->yres << 16; /* VDLN */
509 lcdc_write_chan(ch, LDVLNR, tmp);
510
511 tmp = lcd_cfg->yres;
512 tmp += lcd_cfg->lower_margin; /* VSYNP */
513 tmp |= lcd_cfg->vsync_len << 16; /* VSYNW */
514 lcdc_write_chan(ch, LDVSYNR, tmp);
515
516 board_cfg = &ch->cfg.board_cfg;
517 if (board_cfg->setup_sys)
518 ret = board_cfg->setup_sys(board_cfg->board_data, ch,
519 &sh_mobile_lcdc_sys_bus_ops);
520 if (ret)
521 return ret;
522 }
523
524 /* word and long word swap */
525 lcdc_write(priv, _LDDDSR, lcdc_read(priv, _LDDDSR) | 6);
526
527 for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
528 ch = &priv->ch[k];
529
530 if (!priv->ch[k].enabled)
531 continue;
532
533 /* set bpp format in PKF[4:0] */
534 tmp = lcdc_read_chan(ch, LDDFR);
535 tmp &= ~(0x0001001f);
536 tmp |= (ch->info->var.bits_per_pixel == 16) ? 3 : 0;
537 lcdc_write_chan(ch, LDDFR, tmp);
538
539 /* point out our frame buffer */
540 lcdc_write_chan(ch, LDSA1R, ch->info->fix.smem_start);
541
542 /* set line size */
543 lcdc_write_chan(ch, LDMLSR, ch->info->fix.line_length);
544
545 /* setup deferred io if SYS bus */
546 tmp = ch->cfg.sys_bus_cfg.deferred_io_msec;
547 if (ch->ldmt1r_value & (1 << 12) && tmp) {
548 ch->defio.deferred_io = sh_mobile_lcdc_deferred_io;
549 ch->defio.delay = msecs_to_jiffies(tmp);
550 ch->info->fbdefio = &ch->defio;
551 fb_deferred_io_init(ch->info);
552
553 /* one-shot mode */
554 lcdc_write_chan(ch, LDSM1R, 1);
555
556 /* enable "Frame End Interrupt Enable" bit */
557 lcdc_write(priv, _LDINTR, LDINTR_FE);
558
559 } else {
560 /* continuous read mode */
561 lcdc_write_chan(ch, LDSM1R, 0);
562 }
563 }
564
565 /* display output */
566 lcdc_write(priv, _LDCNT1R, LCDC_ENABLE);
567
568 /* start the lcdc */
569 sh_mobile_lcdc_start_stop(priv, 1);
570 priv->started = 1;
571
572 /* tell the board code to enable the panel */
573 for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
574 ch = &priv->ch[k];
575 if (!ch->enabled)
576 continue;
577
578 board_cfg = &ch->cfg.board_cfg;
579 if (board_cfg->display_on)
580 board_cfg->display_on(board_cfg->board_data);
581 }
582
583 return 0;
584 }
585
586 static void sh_mobile_lcdc_stop(struct sh_mobile_lcdc_priv *priv)
587 {
588 struct sh_mobile_lcdc_chan *ch;
589 struct sh_mobile_lcdc_board_cfg *board_cfg;
590 int k;
591
592 /* clean up deferred io and ask board code to disable panel */
593 for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
594 ch = &priv->ch[k];
595 if (!ch->enabled)
596 continue;
597
598 /* deferred io mode:
599 * flush frame, and wait for frame end interrupt
600 * clean up deferred io and enable clock
601 */
602 if (ch->info->fbdefio) {
603 ch->frame_end = 0;
604 schedule_delayed_work(&ch->info->deferred_work, 0);
605 wait_event(ch->frame_end_wait, ch->frame_end);
606 fb_deferred_io_cleanup(ch->info);
607 ch->info->fbdefio = NULL;
608 sh_mobile_lcdc_clk_on(priv);
609 }
610
611 board_cfg = &ch->cfg.board_cfg;
612 if (board_cfg->display_off)
613 board_cfg->display_off(board_cfg->board_data);
614 }
615
616 /* stop the lcdc */
617 if (priv->started) {
618 sh_mobile_lcdc_start_stop(priv, 0);
619 priv->started = 0;
620 }
621
622 /* stop clocks */
623 for (k = 0; k < ARRAY_SIZE(priv->ch); k++)
624 if (priv->ch[k].enabled)
625 sh_mobile_lcdc_clk_off(priv);
626 }
627
628 static int sh_mobile_lcdc_check_interface(struct sh_mobile_lcdc_chan *ch)
629 {
630 int ifm, miftyp;
631
632 switch (ch->cfg.interface_type) {
633 case RGB8: ifm = 0; miftyp = 0; break;
634 case RGB9: ifm = 0; miftyp = 4; break;
635 case RGB12A: ifm = 0; miftyp = 5; break;
636 case RGB12B: ifm = 0; miftyp = 6; break;
637 case RGB16: ifm = 0; miftyp = 7; break;
638 case RGB18: ifm = 0; miftyp = 10; break;
639 case RGB24: ifm = 0; miftyp = 11; break;
640 case SYS8A: ifm = 1; miftyp = 0; break;
641 case SYS8B: ifm = 1; miftyp = 1; break;
642 case SYS8C: ifm = 1; miftyp = 2; break;
643 case SYS8D: ifm = 1; miftyp = 3; break;
644 case SYS9: ifm = 1; miftyp = 4; break;
645 case SYS12: ifm = 1; miftyp = 5; break;
646 case SYS16A: ifm = 1; miftyp = 7; break;
647 case SYS16B: ifm = 1; miftyp = 8; break;
648 case SYS16C: ifm = 1; miftyp = 9; break;
649 case SYS18: ifm = 1; miftyp = 10; break;
650 case SYS24: ifm = 1; miftyp = 11; break;
651 default: goto bad;
652 }
653
654 /* SUBLCD only supports SYS interface */
655 if (lcdc_chan_is_sublcd(ch)) {
656 if (ifm == 0)
657 goto bad;
658 else
659 ifm = 0;
660 }
661
662 ch->ldmt1r_value = (ifm << 12) | miftyp;
663 return 0;
664 bad:
665 return -EINVAL;
666 }
667
668 static int sh_mobile_lcdc_setup_clocks(struct platform_device *pdev,
669 int clock_source,
670 struct sh_mobile_lcdc_priv *priv)
671 {
672 char *str;
673 int icksel;
674
675 switch (clock_source) {
676 case LCDC_CLK_BUS: str = "bus_clk"; icksel = 0; break;
677 case LCDC_CLK_PERIPHERAL: str = "peripheral_clk"; icksel = 1; break;
678 case LCDC_CLK_EXTERNAL: str = NULL; icksel = 2; break;
679 default:
680 return -EINVAL;
681 }
682
683 priv->lddckr = icksel << 16;
684
685 if (str) {
686 priv->dot_clk = clk_get(&pdev->dev, str);
687 if (IS_ERR(priv->dot_clk)) {
688 dev_err(&pdev->dev, "cannot get dot clock %s\n", str);
689 return PTR_ERR(priv->dot_clk);
690 }
691 }
692 atomic_set(&priv->hw_usecnt, -1);
693
694 /* Runtime PM support involves two step for this driver:
695 * 1) Enable Runtime PM
696 * 2) Force Runtime PM Resume since hardware is accessed from probe()
697 */
698 priv->dev = &pdev->dev;
699 pm_runtime_enable(priv->dev);
700 pm_runtime_resume(priv->dev);
701 return 0;
702 }
703
704 static int sh_mobile_lcdc_setcolreg(u_int regno,
705 u_int red, u_int green, u_int blue,
706 u_int transp, struct fb_info *info)
707 {
708 u32 *palette = info->pseudo_palette;
709
710 if (regno >= PALETTE_NR)
711 return -EINVAL;
712
713 /* only FB_VISUAL_TRUECOLOR supported */
714
715 red >>= 16 - info->var.red.length;
716 green >>= 16 - info->var.green.length;
717 blue >>= 16 - info->var.blue.length;
718 transp >>= 16 - info->var.transp.length;
719
720 palette[regno] = (red << info->var.red.offset) |
721 (green << info->var.green.offset) |
722 (blue << info->var.blue.offset) |
723 (transp << info->var.transp.offset);
724
725 return 0;
726 }
727
728 static struct fb_fix_screeninfo sh_mobile_lcdc_fix = {
729 .id = "SH Mobile LCDC",
730 .type = FB_TYPE_PACKED_PIXELS,
731 .visual = FB_VISUAL_TRUECOLOR,
732 .accel = FB_ACCEL_NONE,
733 .xpanstep = 0,
734 .ypanstep = 1,
735 .ywrapstep = 0,
736 };
737
738 static void sh_mobile_lcdc_fillrect(struct fb_info *info,
739 const struct fb_fillrect *rect)
740 {
741 sys_fillrect(info, rect);
742 sh_mobile_lcdc_deferred_io_touch(info);
743 }
744
745 static void sh_mobile_lcdc_copyarea(struct fb_info *info,
746 const struct fb_copyarea *area)
747 {
748 sys_copyarea(info, area);
749 sh_mobile_lcdc_deferred_io_touch(info);
750 }
751
752 static void sh_mobile_lcdc_imageblit(struct fb_info *info,
753 const struct fb_image *image)
754 {
755 sys_imageblit(info, image);
756 sh_mobile_lcdc_deferred_io_touch(info);
757 }
758
759 static int sh_mobile_fb_pan_display(struct fb_var_screeninfo *var,
760 struct fb_info *info)
761 {
762 struct sh_mobile_lcdc_chan *ch = info->par;
763 struct sh_mobile_lcdc_priv *priv = ch->lcdc;
764 unsigned long ldrcntr;
765 unsigned long new_pan_offset;
766
767 new_pan_offset = (var->yoffset * info->fix.line_length) +
768 (var->xoffset * (info->var.bits_per_pixel / 8));
769
770 if (new_pan_offset == ch->pan_offset)
771 return 0; /* No change, do nothing */
772
773 ldrcntr = lcdc_read(priv, _LDRCNTR);
774
775 /* Set the source address for the next refresh */
776 lcdc_write_chan_mirror(ch, LDSA1R, ch->dma_handle + new_pan_offset);
777 if (lcdc_chan_is_sublcd(ch))
778 lcdc_write(ch->lcdc, _LDRCNTR, ldrcntr ^ LDRCNTR_SRS);
779 else
780 lcdc_write(ch->lcdc, _LDRCNTR, ldrcntr ^ LDRCNTR_MRS);
781
782 ch->pan_offset = new_pan_offset;
783
784 sh_mobile_lcdc_deferred_io_touch(info);
785
786 return 0;
787 }
788
789 static int sh_mobile_wait_for_vsync(struct fb_info *info)
790 {
791 struct sh_mobile_lcdc_chan *ch = info->par;
792 unsigned long ldintr;
793 int ret;
794
795 /* Enable VSync End interrupt */
796 ldintr = lcdc_read(ch->lcdc, _LDINTR);
797 ldintr |= LDINTR_VEE;
798 lcdc_write(ch->lcdc, _LDINTR, ldintr);
799
800 ret = wait_for_completion_interruptible_timeout(&ch->vsync_completion,
801 msecs_to_jiffies(100));
802 if (!ret)
803 return -ETIMEDOUT;
804
805 return 0;
806 }
807
808 static int sh_mobile_ioctl(struct fb_info *info, unsigned int cmd,
809 unsigned long arg)
810 {
811 int retval;
812
813 switch (cmd) {
814 case FBIO_WAITFORVSYNC:
815 retval = sh_mobile_wait_for_vsync(info);
816 break;
817
818 default:
819 retval = -ENOIOCTLCMD;
820 break;
821 }
822 return retval;
823 }
824
825
826 static struct fb_ops sh_mobile_lcdc_ops = {
827 .owner = THIS_MODULE,
828 .fb_setcolreg = sh_mobile_lcdc_setcolreg,
829 .fb_read = fb_sys_read,
830 .fb_write = fb_sys_write,
831 .fb_fillrect = sh_mobile_lcdc_fillrect,
832 .fb_copyarea = sh_mobile_lcdc_copyarea,
833 .fb_imageblit = sh_mobile_lcdc_imageblit,
834 .fb_pan_display = sh_mobile_fb_pan_display,
835 .fb_ioctl = sh_mobile_ioctl,
836 };
837
838 static int sh_mobile_lcdc_set_bpp(struct fb_var_screeninfo *var, int bpp)
839 {
840 switch (bpp) {
841 case 16: /* PKF[4:0] = 00011 - RGB 565 */
842 var->red.offset = 11;
843 var->red.length = 5;
844 var->green.offset = 5;
845 var->green.length = 6;
846 var->blue.offset = 0;
847 var->blue.length = 5;
848 var->transp.offset = 0;
849 var->transp.length = 0;
850 break;
851
852 case 32: /* PKF[4:0] = 00000 - RGB 888
853 * sh7722 pdf says 00RRGGBB but reality is GGBB00RR
854 * this may be because LDDDSR has word swap enabled..
855 */
856 var->red.offset = 0;
857 var->red.length = 8;
858 var->green.offset = 24;
859 var->green.length = 8;
860 var->blue.offset = 16;
861 var->blue.length = 8;
862 var->transp.offset = 0;
863 var->transp.length = 0;
864 break;
865 default:
866 return -EINVAL;
867 }
868 var->bits_per_pixel = bpp;
869 var->red.msb_right = 0;
870 var->green.msb_right = 0;
871 var->blue.msb_right = 0;
872 var->transp.msb_right = 0;
873 return 0;
874 }
875
876 static int sh_mobile_lcdc_suspend(struct device *dev)
877 {
878 struct platform_device *pdev = to_platform_device(dev);
879
880 sh_mobile_lcdc_stop(platform_get_drvdata(pdev));
881 return 0;
882 }
883
884 static int sh_mobile_lcdc_resume(struct device *dev)
885 {
886 struct platform_device *pdev = to_platform_device(dev);
887
888 return sh_mobile_lcdc_start(platform_get_drvdata(pdev));
889 }
890
891 static int sh_mobile_lcdc_runtime_suspend(struct device *dev)
892 {
893 struct platform_device *pdev = to_platform_device(dev);
894 struct sh_mobile_lcdc_priv *p = platform_get_drvdata(pdev);
895 struct sh_mobile_lcdc_chan *ch;
896 int k, n;
897
898 /* save per-channel registers */
899 for (k = 0; k < ARRAY_SIZE(p->ch); k++) {
900 ch = &p->ch[k];
901 if (!ch->enabled)
902 continue;
903 for (n = 0; n < NR_CH_REGS; n++)
904 ch->saved_ch_regs[n] = lcdc_read_chan(ch, n);
905 }
906
907 /* save shared registers */
908 for (n = 0; n < NR_SHARED_REGS; n++)
909 p->saved_shared_regs[n] = lcdc_read(p, lcdc_shared_regs[n]);
910
911 /* turn off LCDC hardware */
912 lcdc_write(p, _LDCNT1R, 0);
913 return 0;
914 }
915
916 static int sh_mobile_lcdc_runtime_resume(struct device *dev)
917 {
918 struct platform_device *pdev = to_platform_device(dev);
919 struct sh_mobile_lcdc_priv *p = platform_get_drvdata(pdev);
920 struct sh_mobile_lcdc_chan *ch;
921 int k, n;
922
923 /* restore per-channel registers */
924 for (k = 0; k < ARRAY_SIZE(p->ch); k++) {
925 ch = &p->ch[k];
926 if (!ch->enabled)
927 continue;
928 for (n = 0; n < NR_CH_REGS; n++)
929 lcdc_write_chan(ch, n, ch->saved_ch_regs[n]);
930 }
931
932 /* restore shared registers */
933 for (n = 0; n < NR_SHARED_REGS; n++)
934 lcdc_write(p, lcdc_shared_regs[n], p->saved_shared_regs[n]);
935
936 return 0;
937 }
938
939 static const struct dev_pm_ops sh_mobile_lcdc_dev_pm_ops = {
940 .suspend = sh_mobile_lcdc_suspend,
941 .resume = sh_mobile_lcdc_resume,
942 .runtime_suspend = sh_mobile_lcdc_runtime_suspend,
943 .runtime_resume = sh_mobile_lcdc_runtime_resume,
944 };
945
946 static int sh_mobile_lcdc_remove(struct platform_device *pdev);
947
948 static int __devinit sh_mobile_lcdc_probe(struct platform_device *pdev)
949 {
950 struct fb_info *info;
951 struct sh_mobile_lcdc_priv *priv;
952 struct sh_mobile_lcdc_info *pdata;
953 struct sh_mobile_lcdc_chan_cfg *cfg;
954 struct resource *res;
955 int error;
956 void *buf;
957 int i, j;
958
959 if (!pdev->dev.platform_data) {
960 dev_err(&pdev->dev, "no platform data defined\n");
961 return -EINVAL;
962 }
963
964 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
965 i = platform_get_irq(pdev, 0);
966 if (!res || i < 0) {
967 dev_err(&pdev->dev, "cannot get platform resources\n");
968 return -ENOENT;
969 }
970
971 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
972 if (!priv) {
973 dev_err(&pdev->dev, "cannot allocate device data\n");
974 return -ENOMEM;
975 }
976
977 platform_set_drvdata(pdev, priv);
978
979 error = request_irq(i, sh_mobile_lcdc_irq, IRQF_DISABLED,
980 dev_name(&pdev->dev), priv);
981 if (error) {
982 dev_err(&pdev->dev, "unable to request irq\n");
983 goto err1;
984 }
985
986 priv->irq = i;
987 pdata = pdev->dev.platform_data;
988
989 j = 0;
990 for (i = 0; i < ARRAY_SIZE(pdata->ch); i++) {
991 priv->ch[j].lcdc = priv;
992 memcpy(&priv->ch[j].cfg, &pdata->ch[i], sizeof(pdata->ch[i]));
993
994 error = sh_mobile_lcdc_check_interface(&priv->ch[i]);
995 if (error) {
996 dev_err(&pdev->dev, "unsupported interface type\n");
997 goto err1;
998 }
999 init_waitqueue_head(&priv->ch[i].frame_end_wait);
1000 init_completion(&priv->ch[i].vsync_completion);
1001 priv->ch[j].pan_offset = 0;
1002
1003 switch (pdata->ch[i].chan) {
1004 case LCDC_CHAN_MAINLCD:
1005 priv->ch[j].enabled = 1 << 1;
1006 priv->ch[j].reg_offs = lcdc_offs_mainlcd;
1007 j++;
1008 break;
1009 case LCDC_CHAN_SUBLCD:
1010 priv->ch[j].enabled = 1 << 2;
1011 priv->ch[j].reg_offs = lcdc_offs_sublcd;
1012 j++;
1013 break;
1014 }
1015 }
1016
1017 if (!j) {
1018 dev_err(&pdev->dev, "no channels defined\n");
1019 error = -EINVAL;
1020 goto err1;
1021 }
1022
1023 error = sh_mobile_lcdc_setup_clocks(pdev, pdata->clock_source, priv);
1024 if (error) {
1025 dev_err(&pdev->dev, "unable to setup clocks\n");
1026 goto err1;
1027 }
1028
1029 priv->base = ioremap_nocache(res->start, (res->end - res->start) + 1);
1030
1031 for (i = 0; i < j; i++) {
1032 cfg = &priv->ch[i].cfg;
1033
1034 priv->ch[i].info = framebuffer_alloc(0, &pdev->dev);
1035 if (!priv->ch[i].info) {
1036 dev_err(&pdev->dev, "unable to allocate fb_info\n");
1037 error = -ENOMEM;
1038 break;
1039 }
1040
1041 info = priv->ch[i].info;
1042 info->fbops = &sh_mobile_lcdc_ops;
1043 info->var.xres = info->var.xres_virtual = cfg->lcd_cfg.xres;
1044 info->var.yres = cfg->lcd_cfg.yres;
1045 /* Default Y virtual resolution is 2x panel size */
1046 info->var.yres_virtual = info->var.yres * 2;
1047 info->var.width = cfg->lcd_size_cfg.width;
1048 info->var.height = cfg->lcd_size_cfg.height;
1049 info->var.activate = FB_ACTIVATE_NOW;
1050 error = sh_mobile_lcdc_set_bpp(&info->var, cfg->bpp);
1051 if (error)
1052 break;
1053
1054 info->fix = sh_mobile_lcdc_fix;
1055 info->fix.line_length = cfg->lcd_cfg.xres * (cfg->bpp / 8);
1056 info->fix.smem_len = info->fix.line_length *
1057 info->var.yres_virtual;
1058
1059 buf = dma_alloc_coherent(&pdev->dev, info->fix.smem_len,
1060 &priv->ch[i].dma_handle, GFP_KERNEL);
1061 if (!buf) {
1062 dev_err(&pdev->dev, "unable to allocate buffer\n");
1063 error = -ENOMEM;
1064 break;
1065 }
1066
1067 info->pseudo_palette = &priv->ch[i].pseudo_palette;
1068 info->flags = FBINFO_FLAG_DEFAULT;
1069
1070 error = fb_alloc_cmap(&info->cmap, PALETTE_NR, 0);
1071 if (error < 0) {
1072 dev_err(&pdev->dev, "unable to allocate cmap\n");
1073 dma_free_coherent(&pdev->dev, info->fix.smem_len,
1074 buf, priv->ch[i].dma_handle);
1075 break;
1076 }
1077
1078 memset(buf, 0, info->fix.smem_len);
1079 info->fix.smem_start = priv->ch[i].dma_handle;
1080 info->screen_base = buf;
1081 info->device = &pdev->dev;
1082 info->par = &priv->ch[i];
1083 }
1084
1085 if (error)
1086 goto err1;
1087
1088 error = sh_mobile_lcdc_start(priv);
1089 if (error) {
1090 dev_err(&pdev->dev, "unable to start hardware\n");
1091 goto err1;
1092 }
1093
1094 for (i = 0; i < j; i++) {
1095 struct sh_mobile_lcdc_chan *ch = priv->ch + i;
1096
1097 info = ch->info;
1098
1099 if (info->fbdefio) {
1100 ch->sglist = vmalloc(sizeof(struct scatterlist) *
1101 info->fix.smem_len >> PAGE_SHIFT);
1102 if (!ch->sglist) {
1103 dev_err(&pdev->dev, "cannot allocate sglist\n");
1104 goto err1;
1105 }
1106 }
1107
1108 error = register_framebuffer(info);
1109 if (error < 0)
1110 goto err1;
1111
1112 dev_info(info->dev,
1113 "registered %s/%s as %dx%d %dbpp.\n",
1114 pdev->name,
1115 (ch->cfg.chan == LCDC_CHAN_MAINLCD) ?
1116 "mainlcd" : "sublcd",
1117 (int) ch->cfg.lcd_cfg.xres,
1118 (int) ch->cfg.lcd_cfg.yres,
1119 ch->cfg.bpp);
1120
1121 /* deferred io mode: disable clock to save power */
1122 if (info->fbdefio)
1123 sh_mobile_lcdc_clk_off(priv);
1124 }
1125
1126 return 0;
1127 err1:
1128 sh_mobile_lcdc_remove(pdev);
1129
1130 return error;
1131 }
1132
1133 static int sh_mobile_lcdc_remove(struct platform_device *pdev)
1134 {
1135 struct sh_mobile_lcdc_priv *priv = platform_get_drvdata(pdev);
1136 struct fb_info *info;
1137 int i;
1138
1139 for (i = 0; i < ARRAY_SIZE(priv->ch); i++)
1140 if (priv->ch[i].info && priv->ch[i].info->dev)
1141 unregister_framebuffer(priv->ch[i].info);
1142
1143 sh_mobile_lcdc_stop(priv);
1144
1145 for (i = 0; i < ARRAY_SIZE(priv->ch); i++) {
1146 info = priv->ch[i].info;
1147
1148 if (!info || !info->device)
1149 continue;
1150
1151 if (priv->ch[i].sglist)
1152 vfree(priv->ch[i].sglist);
1153
1154 dma_free_coherent(&pdev->dev, info->fix.smem_len,
1155 info->screen_base, priv->ch[i].dma_handle);
1156 fb_dealloc_cmap(&info->cmap);
1157 framebuffer_release(info);
1158 }
1159
1160 if (priv->dot_clk)
1161 clk_put(priv->dot_clk);
1162
1163 if (priv->dev)
1164 pm_runtime_disable(priv->dev);
1165
1166 if (priv->base)
1167 iounmap(priv->base);
1168
1169 if (priv->irq)
1170 free_irq(priv->irq, priv);
1171 kfree(priv);
1172 return 0;
1173 }
1174
1175 static struct platform_driver sh_mobile_lcdc_driver = {
1176 .driver = {
1177 .name = "sh_mobile_lcdc_fb",
1178 .owner = THIS_MODULE,
1179 .pm = &sh_mobile_lcdc_dev_pm_ops,
1180 },
1181 .probe = sh_mobile_lcdc_probe,
1182 .remove = sh_mobile_lcdc_remove,
1183 };
1184
1185 static int __init sh_mobile_lcdc_init(void)
1186 {
1187 return platform_driver_register(&sh_mobile_lcdc_driver);
1188 }
1189
1190 static void __exit sh_mobile_lcdc_exit(void)
1191 {
1192 platform_driver_unregister(&sh_mobile_lcdc_driver);
1193 }
1194
1195 module_init(sh_mobile_lcdc_init);
1196 module_exit(sh_mobile_lcdc_exit);
1197
1198 MODULE_DESCRIPTION("SuperH Mobile LCDC Framebuffer driver");
1199 MODULE_AUTHOR("Magnus Damm <damm@opensource.se>");
1200 MODULE_LICENSE("GPL v2");
WandBoard kernel