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8#include <linux/module.h>
9#include <linux/device.h>
10#include <linux/interrupt.h>
11#include <linux/spinlock.h>
12#include <linux/err.h>
13#include <linux/mm.h>
14#include <linux/fb.h>
15#include <linux/dma-mapping.h>
16#include <linux/vmalloc.h>
17#include <linux/clk.h>
18#include <linux/gfp.h>
19
20#include <mach/lcdc.h>
21#include <linux/omap-dma.h>
22
23#include <asm/mach-types.h>
24
25#include "omapfb.h"
26
27#include "lcdc.h"
28
29#define MODULE_NAME "lcdc"
30
31#define MAX_PALETTE_SIZE PAGE_SIZE
32
33enum lcdc_load_mode {
34 OMAP_LCDC_LOAD_PALETTE,
35 OMAP_LCDC_LOAD_FRAME,
36 OMAP_LCDC_LOAD_PALETTE_AND_FRAME
37};
38
39static struct omap_lcd_controller {
40 enum omapfb_update_mode update_mode;
41 int ext_mode;
42
43 unsigned long frame_offset;
44 int screen_width;
45 int xres;
46 int yres;
47
48 enum omapfb_color_format color_mode;
49 int bpp;
50 void *palette_virt;
51 dma_addr_t palette_phys;
52 int palette_code;
53 int palette_size;
54
55 unsigned int irq_mask;
56 struct completion last_frame_complete;
57 struct completion palette_load_complete;
58 struct clk *lcd_ck;
59 struct omapfb_device *fbdev;
60
61 void (*dma_callback)(void *data);
62 void *dma_callback_data;
63
64 dma_addr_t vram_phys;
65 void *vram_virt;
66 unsigned long vram_size;
67} lcdc;
68
69static inline void enable_irqs(int mask)
70{
71 lcdc.irq_mask |= mask;
72}
73
74static inline void disable_irqs(int mask)
75{
76 lcdc.irq_mask &= ~mask;
77}
78
79static void set_load_mode(enum lcdc_load_mode mode)
80{
81 u32 l;
82
83 l = omap_readl(OMAP_LCDC_CONTROL);
84 l &= ~(3 << 20);
85 switch (mode) {
86 case OMAP_LCDC_LOAD_PALETTE:
87 l |= 1 << 20;
88 break;
89 case OMAP_LCDC_LOAD_FRAME:
90 l |= 2 << 20;
91 break;
92 case OMAP_LCDC_LOAD_PALETTE_AND_FRAME:
93 break;
94 default:
95 BUG();
96 }
97 omap_writel(l, OMAP_LCDC_CONTROL);
98}
99
100static void enable_controller(void)
101{
102 u32 l;
103
104 l = omap_readl(OMAP_LCDC_CONTROL);
105 l |= OMAP_LCDC_CTRL_LCD_EN;
106 l &= ~OMAP_LCDC_IRQ_MASK;
107 l |= lcdc.irq_mask | OMAP_LCDC_IRQ_DONE;
108 omap_writel(l, OMAP_LCDC_CONTROL);
109}
110
111static void disable_controller_async(void)
112{
113 u32 l;
114 u32 mask;
115
116 l = omap_readl(OMAP_LCDC_CONTROL);
117 mask = OMAP_LCDC_CTRL_LCD_EN | OMAP_LCDC_IRQ_MASK;
118
119
120
121
122 mask &= ~OMAP_LCDC_IRQ_DONE;
123 l &= ~mask;
124 omap_writel(l, OMAP_LCDC_CONTROL);
125}
126
127static void disable_controller(void)
128{
129 init_completion(&lcdc.last_frame_complete);
130 disable_controller_async();
131 if (!wait_for_completion_timeout(&lcdc.last_frame_complete,
132 msecs_to_jiffies(500)))
133 dev_err(lcdc.fbdev->dev, "timeout waiting for FRAME DONE\n");
134}
135
136static void reset_controller(u32 status)
137{
138 static unsigned long reset_count;
139 static unsigned long last_jiffies;
140
141 disable_controller_async();
142 reset_count++;
143 if (reset_count == 1 || time_after(jiffies, last_jiffies + HZ)) {
144 dev_err(lcdc.fbdev->dev,
145 "resetting (status %#010x,reset count %lu)\n",
146 status, reset_count);
147 last_jiffies = jiffies;
148 }
149 if (reset_count < 100) {
150 enable_controller();
151 } else {
152 reset_count = 0;
153 dev_err(lcdc.fbdev->dev,
154 "too many reset attempts, giving up.\n");
155 }
156}
157
158
159
160
161
162static void setup_lcd_dma(void)
163{
164 static const int dma_elem_type[] = {
165 0,
166 OMAP_DMA_DATA_TYPE_S8,
167 OMAP_DMA_DATA_TYPE_S16,
168 0,
169 OMAP_DMA_DATA_TYPE_S32,
170 };
171 struct omapfb_plane_struct *plane = lcdc.fbdev->fb_info[0]->par;
172 struct fb_var_screeninfo *var = &lcdc.fbdev->fb_info[0]->var;
173 unsigned long src;
174 int esize, xelem, yelem;
175
176 src = lcdc.vram_phys + lcdc.frame_offset;
177
178 switch (var->rotate) {
179 case 0:
180 if (plane->info.mirror || (src & 3) ||
181 lcdc.color_mode == OMAPFB_COLOR_YUV420 ||
182 (lcdc.xres & 1))
183 esize = 2;
184 else
185 esize = 4;
186 xelem = lcdc.xres * lcdc.bpp / 8 / esize;
187 yelem = lcdc.yres;
188 break;
189 case 90:
190 case 180:
191 case 270:
192 if (cpu_is_omap15xx()) {
193 BUG();
194 }
195 esize = 2;
196 xelem = lcdc.yres * lcdc.bpp / 16;
197 yelem = lcdc.xres;
198 break;
199 default:
200 BUG();
201 return;
202 }
203#ifdef VERBOSE
204 dev_dbg(lcdc.fbdev->dev,
205 "setup_dma: src %#010lx esize %d xelem %d yelem %d\n",
206 src, esize, xelem, yelem);
207#endif
208 omap_set_lcd_dma_b1(src, xelem, yelem, dma_elem_type[esize]);
209 if (!cpu_is_omap15xx()) {
210 int bpp = lcdc.bpp;
211
212
213
214
215
216 if (lcdc.color_mode == OMAPFB_COLOR_YUV420)
217 bpp = 16;
218
219 omap_set_lcd_dma_b1_vxres(
220 lcdc.screen_width * bpp / 8 / esize);
221
222 omap_set_lcd_dma_b1_rotation(var->rotate);
223 omap_set_lcd_dma_b1_mirror(plane->info.mirror);
224 }
225 omap_setup_lcd_dma();
226}
227
228static irqreturn_t lcdc_irq_handler(int irq, void *dev_id)
229{
230 u32 status;
231
232 status = omap_readl(OMAP_LCDC_STATUS);
233
234 if (status & (OMAP_LCDC_STAT_FUF | OMAP_LCDC_STAT_SYNC_LOST))
235 reset_controller(status);
236 else {
237 if (status & OMAP_LCDC_STAT_DONE) {
238 u32 l;
239
240
241
242
243
244
245 l = omap_readl(OMAP_LCDC_CONTROL);
246 l &= ~OMAP_LCDC_IRQ_DONE;
247 omap_writel(l, OMAP_LCDC_CONTROL);
248 complete(&lcdc.last_frame_complete);
249 }
250 if (status & OMAP_LCDC_STAT_LOADED_PALETTE) {
251 disable_controller_async();
252 complete(&lcdc.palette_load_complete);
253 }
254 }
255
256
257
258
259
260
261
262
263 status &= ~(OMAP_LCDC_STAT_VSYNC |
264 OMAP_LCDC_STAT_LOADED_PALETTE |
265 OMAP_LCDC_STAT_ABC |
266 OMAP_LCDC_STAT_LINE_INT);
267 omap_writel(status, OMAP_LCDC_STATUS);
268 return IRQ_HANDLED;
269}
270
271
272
273
274
275
276
277
278static int omap_lcdc_setup_plane(int plane, int channel_out,
279 unsigned long offset, int screen_width,
280 int pos_x, int pos_y, int width, int height,
281 int color_mode)
282{
283 struct fb_var_screeninfo *var = &lcdc.fbdev->fb_info[0]->var;
284 struct lcd_panel *panel = lcdc.fbdev->panel;
285 int rot_x, rot_y;
286
287 if (var->rotate == 0) {
288 rot_x = panel->x_res;
289 rot_y = panel->y_res;
290 } else {
291 rot_x = panel->y_res;
292 rot_y = panel->x_res;
293 }
294 if (plane != 0 || channel_out != 0 || pos_x != 0 || pos_y != 0 ||
295 width > rot_x || height > rot_y) {
296#ifdef VERBOSE
297 dev_dbg(lcdc.fbdev->dev,
298 "invalid plane params plane %d pos_x %d pos_y %d "
299 "w %d h %d\n", plane, pos_x, pos_y, width, height);
300#endif
301 return -EINVAL;
302 }
303
304 lcdc.frame_offset = offset;
305 lcdc.xres = width;
306 lcdc.yres = height;
307 lcdc.screen_width = screen_width;
308 lcdc.color_mode = color_mode;
309
310 switch (color_mode) {
311 case OMAPFB_COLOR_CLUT_8BPP:
312 lcdc.bpp = 8;
313 lcdc.palette_code = 0x3000;
314 lcdc.palette_size = 512;
315 break;
316 case OMAPFB_COLOR_RGB565:
317 lcdc.bpp = 16;
318 lcdc.palette_code = 0x4000;
319 lcdc.palette_size = 32;
320 break;
321 case OMAPFB_COLOR_RGB444:
322 lcdc.bpp = 16;
323 lcdc.palette_code = 0x4000;
324 lcdc.palette_size = 32;
325 break;
326 case OMAPFB_COLOR_YUV420:
327 if (lcdc.ext_mode) {
328 lcdc.bpp = 12;
329 break;
330 }
331 fallthrough;
332 case OMAPFB_COLOR_YUV422:
333 if (lcdc.ext_mode) {
334 lcdc.bpp = 16;
335 break;
336 }
337 fallthrough;
338 default:
339
340
341
342
343
344
345 dev_dbg(lcdc.fbdev->dev, "invalid color mode %d\n", color_mode);
346 BUG();
347 return -1;
348 }
349
350 if (lcdc.ext_mode) {
351 setup_lcd_dma();
352 return 0;
353 }
354
355 if (lcdc.update_mode == OMAPFB_AUTO_UPDATE) {
356 disable_controller();
357 omap_stop_lcd_dma();
358 setup_lcd_dma();
359 enable_controller();
360 }
361
362 return 0;
363}
364
365static int omap_lcdc_enable_plane(int plane, int enable)
366{
367 dev_dbg(lcdc.fbdev->dev,
368 "plane %d enable %d update_mode %d ext_mode %d\n",
369 plane, enable, lcdc.update_mode, lcdc.ext_mode);
370 if (plane != OMAPFB_PLANE_GFX)
371 return -EINVAL;
372
373 return 0;
374}
375
376
377
378
379
380
381static void load_palette(void)
382{
383 u16 *palette;
384
385 palette = (u16 *)lcdc.palette_virt;
386
387 *(u16 *)palette &= 0x0fff;
388 *(u16 *)palette |= lcdc.palette_code;
389
390 omap_set_lcd_dma_b1(lcdc.palette_phys,
391 lcdc.palette_size / 4 + 1, 1, OMAP_DMA_DATA_TYPE_S32);
392
393 omap_set_lcd_dma_single_transfer(1);
394 omap_setup_lcd_dma();
395
396 init_completion(&lcdc.palette_load_complete);
397 enable_irqs(OMAP_LCDC_IRQ_LOADED_PALETTE);
398 set_load_mode(OMAP_LCDC_LOAD_PALETTE);
399 enable_controller();
400 if (!wait_for_completion_timeout(&lcdc.palette_load_complete,
401 msecs_to_jiffies(500)))
402 dev_err(lcdc.fbdev->dev, "timeout waiting for FRAME DONE\n");
403
404 disable_irqs(OMAP_LCDC_IRQ_LOADED_PALETTE);
405 omap_stop_lcd_dma();
406
407 omap_set_lcd_dma_single_transfer(lcdc.ext_mode);
408}
409
410
411static int omap_lcdc_setcolreg(u_int regno, u16 red, u16 green, u16 blue,
412 u16 transp, int update_hw_pal)
413{
414 u16 *palette;
415
416 if (lcdc.color_mode != OMAPFB_COLOR_CLUT_8BPP || regno > 255)
417 return -EINVAL;
418
419 palette = (u16 *)lcdc.palette_virt;
420
421 palette[regno] &= ~0x0fff;
422 palette[regno] |= ((red >> 12) << 8) | ((green >> 12) << 4 ) |
423 (blue >> 12);
424
425 if (update_hw_pal) {
426 disable_controller();
427 omap_stop_lcd_dma();
428 load_palette();
429 setup_lcd_dma();
430 set_load_mode(OMAP_LCDC_LOAD_FRAME);
431 enable_controller();
432 }
433
434 return 0;
435}
436
437static void calc_ck_div(int is_tft, int pck, int *pck_div)
438{
439 unsigned long lck;
440
441 pck = max(1, pck);
442 lck = clk_get_rate(lcdc.lcd_ck);
443 *pck_div = (lck + pck - 1) / pck;
444 if (is_tft)
445 *pck_div = max(2, *pck_div);
446 else
447 *pck_div = max(3, *pck_div);
448 if (*pck_div > 255) {
449
450 *pck_div = 255;
451 dev_warn(lcdc.fbdev->dev, "pixclock %d kHz too low.\n",
452 pck / 1000);
453 }
454}
455
456static inline void setup_regs(void)
457{
458 u32 l;
459 struct lcd_panel *panel = lcdc.fbdev->panel;
460 int is_tft = panel->config & OMAP_LCDC_PANEL_TFT;
461 unsigned long lck;
462 int pcd;
463
464 l = omap_readl(OMAP_LCDC_CONTROL);
465 l &= ~OMAP_LCDC_CTRL_LCD_TFT;
466 l |= is_tft ? OMAP_LCDC_CTRL_LCD_TFT : 0;
467#ifdef CONFIG_MACH_OMAP_PALMTE
468
469
470 l |= (is_tft && panel->bpp == 8) ? 0x810000 : 0;
471
472#endif
473 omap_writel(l, OMAP_LCDC_CONTROL);
474
475 l = omap_readl(OMAP_LCDC_TIMING2);
476 l &= ~(((1 << 6) - 1) << 20);
477 l |= (panel->config & OMAP_LCDC_SIGNAL_MASK) << 20;
478 omap_writel(l, OMAP_LCDC_TIMING2);
479
480 l = panel->x_res - 1;
481 l |= (panel->hsw - 1) << 10;
482 l |= (panel->hfp - 1) << 16;
483 l |= (panel->hbp - 1) << 24;
484 omap_writel(l, OMAP_LCDC_TIMING0);
485
486 l = panel->y_res - 1;
487 l |= (panel->vsw - 1) << 10;
488 l |= panel->vfp << 16;
489 l |= panel->vbp << 24;
490 omap_writel(l, OMAP_LCDC_TIMING1);
491
492 l = omap_readl(OMAP_LCDC_TIMING2);
493 l &= ~0xff;
494
495 lck = clk_get_rate(lcdc.lcd_ck);
496
497 if (!panel->pcd)
498 calc_ck_div(is_tft, panel->pixel_clock * 1000, &pcd);
499 else {
500 dev_warn(lcdc.fbdev->dev,
501 "Pixel clock divider value is obsolete.\n"
502 "Try to set pixel_clock to %lu and pcd to 0 "
503 "in drivers/video/omap/lcd_%s.c and submit a patch.\n",
504 lck / panel->pcd / 1000, panel->name);
505
506 pcd = panel->pcd;
507 }
508 l |= pcd & 0xff;
509 l |= panel->acb << 8;
510 omap_writel(l, OMAP_LCDC_TIMING2);
511
512
513 panel->pixel_clock = lck / pcd / 1000;
514}
515
516
517
518
519
520
521static int omap_lcdc_set_update_mode(enum omapfb_update_mode mode)
522{
523 int r = 0;
524
525 if (mode != lcdc.update_mode) {
526 switch (mode) {
527 case OMAPFB_AUTO_UPDATE:
528 setup_regs();
529 load_palette();
530
531
532 setup_lcd_dma();
533
534 set_load_mode(OMAP_LCDC_LOAD_FRAME);
535 enable_irqs(OMAP_LCDC_IRQ_DONE);
536
537 enable_controller();
538 lcdc.update_mode = mode;
539 break;
540 case OMAPFB_UPDATE_DISABLED:
541 disable_controller();
542 omap_stop_lcd_dma();
543 lcdc.update_mode = mode;
544 break;
545 default:
546 r = -EINVAL;
547 }
548 }
549
550 return r;
551}
552
553static enum omapfb_update_mode omap_lcdc_get_update_mode(void)
554{
555 return lcdc.update_mode;
556}
557
558
559static void omap_lcdc_suspend(void)
560{
561 omap_lcdc_set_update_mode(OMAPFB_UPDATE_DISABLED);
562}
563
564static void omap_lcdc_resume(void)
565{
566 omap_lcdc_set_update_mode(OMAPFB_AUTO_UPDATE);
567}
568
569static void omap_lcdc_get_caps(int plane, struct omapfb_caps *caps)
570{
571 return;
572}
573
574int omap_lcdc_set_dma_callback(void (*callback)(void *data), void *data)
575{
576 BUG_ON(callback == NULL);
577
578 if (lcdc.dma_callback)
579 return -EBUSY;
580 else {
581 lcdc.dma_callback = callback;
582 lcdc.dma_callback_data = data;
583 }
584 return 0;
585}
586EXPORT_SYMBOL(omap_lcdc_set_dma_callback);
587
588void omap_lcdc_free_dma_callback(void)
589{
590 lcdc.dma_callback = NULL;
591}
592EXPORT_SYMBOL(omap_lcdc_free_dma_callback);
593
594static void lcdc_dma_handler(u16 status, void *data)
595{
596 if (lcdc.dma_callback)
597 lcdc.dma_callback(lcdc.dma_callback_data);
598}
599
600static int alloc_palette_ram(void)
601{
602 lcdc.palette_virt = dma_alloc_wc(lcdc.fbdev->dev, MAX_PALETTE_SIZE,
603 &lcdc.palette_phys, GFP_KERNEL);
604 if (lcdc.palette_virt == NULL) {
605 dev_err(lcdc.fbdev->dev, "failed to alloc palette memory\n");
606 return -ENOMEM;
607 }
608 memset(lcdc.palette_virt, 0, MAX_PALETTE_SIZE);
609
610 return 0;
611}
612
613static void free_palette_ram(void)
614{
615 dma_free_wc(lcdc.fbdev->dev, MAX_PALETTE_SIZE, lcdc.palette_virt,
616 lcdc.palette_phys);
617}
618
619static int alloc_fbmem(struct omapfb_mem_region *region)
620{
621 int bpp;
622 int frame_size;
623 struct lcd_panel *panel = lcdc.fbdev->panel;
624
625 bpp = panel->bpp;
626 if (bpp == 12)
627 bpp = 16;
628 frame_size = PAGE_ALIGN(panel->x_res * bpp / 8 * panel->y_res);
629 if (region->size > frame_size)
630 frame_size = region->size;
631 lcdc.vram_size = frame_size;
632 lcdc.vram_virt = dma_alloc_wc(lcdc.fbdev->dev, lcdc.vram_size,
633 &lcdc.vram_phys, GFP_KERNEL);
634 if (lcdc.vram_virt == NULL) {
635 dev_err(lcdc.fbdev->dev, "unable to allocate FB DMA memory\n");
636 return -ENOMEM;
637 }
638 region->size = frame_size;
639 region->paddr = lcdc.vram_phys;
640 region->vaddr = lcdc.vram_virt;
641 region->alloc = 1;
642
643 memset(lcdc.vram_virt, 0, lcdc.vram_size);
644
645 return 0;
646}
647
648static void free_fbmem(void)
649{
650 dma_free_wc(lcdc.fbdev->dev, lcdc.vram_size, lcdc.vram_virt,
651 lcdc.vram_phys);
652}
653
654static int setup_fbmem(struct omapfb_mem_desc *req_md)
655{
656 if (!req_md->region_cnt) {
657 dev_err(lcdc.fbdev->dev, "no memory regions defined\n");
658 return -EINVAL;
659 }
660
661 if (req_md->region_cnt > 1) {
662 dev_err(lcdc.fbdev->dev, "only one plane is supported\n");
663 req_md->region_cnt = 1;
664 }
665
666 return alloc_fbmem(&req_md->region[0]);
667}
668
669static int omap_lcdc_init(struct omapfb_device *fbdev, int ext_mode,
670 struct omapfb_mem_desc *req_vram)
671{
672 int r;
673 u32 l;
674 int rate;
675 struct clk *tc_ck;
676
677 lcdc.irq_mask = 0;
678
679 lcdc.fbdev = fbdev;
680 lcdc.ext_mode = ext_mode;
681
682 l = 0;
683 omap_writel(l, OMAP_LCDC_CONTROL);
684
685
686
687
688 lcdc.lcd_ck = clk_get(fbdev->dev, "lcd_ck");
689 if (IS_ERR(lcdc.lcd_ck)) {
690 dev_err(fbdev->dev, "unable to access LCD clock\n");
691 r = PTR_ERR(lcdc.lcd_ck);
692 goto fail0;
693 }
694
695 tc_ck = clk_get(fbdev->dev, "tc_ck");
696 if (IS_ERR(tc_ck)) {
697 dev_err(fbdev->dev, "unable to access TC clock\n");
698 r = PTR_ERR(tc_ck);
699 goto fail1;
700 }
701
702 rate = clk_get_rate(tc_ck);
703 clk_put(tc_ck);
704
705 if (machine_is_ams_delta())
706 rate /= 4;
707 if (machine_is_omap_h3())
708 rate /= 3;
709 r = clk_set_rate(lcdc.lcd_ck, rate);
710 if (r) {
711 dev_err(fbdev->dev, "failed to adjust LCD rate\n");
712 goto fail1;
713 }
714 clk_enable(lcdc.lcd_ck);
715
716 r = request_irq(OMAP_LCDC_IRQ, lcdc_irq_handler, 0, MODULE_NAME, fbdev);
717 if (r) {
718 dev_err(fbdev->dev, "unable to get IRQ\n");
719 goto fail2;
720 }
721
722 r = omap_request_lcd_dma(lcdc_dma_handler, NULL);
723 if (r) {
724 dev_err(fbdev->dev, "unable to get LCD DMA\n");
725 goto fail3;
726 }
727
728 omap_set_lcd_dma_single_transfer(ext_mode);
729 omap_set_lcd_dma_ext_controller(ext_mode);
730
731 if (!ext_mode)
732 if ((r = alloc_palette_ram()) < 0)
733 goto fail4;
734
735 if ((r = setup_fbmem(req_vram)) < 0)
736 goto fail5;
737
738 pr_info("omapfb: LCDC initialized\n");
739
740 return 0;
741fail5:
742 if (!ext_mode)
743 free_palette_ram();
744fail4:
745 omap_free_lcd_dma();
746fail3:
747 free_irq(OMAP_LCDC_IRQ, lcdc.fbdev);
748fail2:
749 clk_disable(lcdc.lcd_ck);
750fail1:
751 clk_put(lcdc.lcd_ck);
752fail0:
753 return r;
754}
755
756static void omap_lcdc_cleanup(void)
757{
758 if (!lcdc.ext_mode)
759 free_palette_ram();
760 free_fbmem();
761 omap_free_lcd_dma();
762 free_irq(OMAP_LCDC_IRQ, lcdc.fbdev);
763 clk_disable(lcdc.lcd_ck);
764 clk_put(lcdc.lcd_ck);
765}
766
767const struct lcd_ctrl omap1_int_ctrl = {
768 .name = "internal",
769 .init = omap_lcdc_init,
770 .cleanup = omap_lcdc_cleanup,
771 .get_caps = omap_lcdc_get_caps,
772 .set_update_mode = omap_lcdc_set_update_mode,
773 .get_update_mode = omap_lcdc_get_update_mode,
774 .update_window = NULL,
775 .suspend = omap_lcdc_suspend,
776 .resume = omap_lcdc_resume,
777 .setup_plane = omap_lcdc_setup_plane,
778 .enable_plane = omap_lcdc_enable_plane,
779 .setcolreg = omap_lcdc_setcolreg,
780};
781
