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31#include <linux/module.h>
32#include <linux/kernel.h>
33#include <linux/errno.h>
34#include <linux/string.h>
35#include <linux/mm.h>
36#include <linux/tty.h>
37#include <linux/slab.h>
38#include <linux/delay.h>
39#include <linux/fb.h>
40#include <linux/ioport.h>
41#include <linux/init.h>
42#include <linux/types.h>
43#include <linux/interrupt.h>
44#include <linux/sched.h>
45#include <linux/timer.h>
46#include <linux/device.h>
47#include <linux/backlight.h>
48#include <linux/lcd.h>
49#include <linux/spinlock.h>
50#include <linux/dma-mapping.h>
51#include <linux/platform_device.h>
52#include <linux/gpio.h>
53
54#include <asm/blackfin.h>
55#include <asm/irq.h>
56#include <asm/dpmc.h>
57#include <asm/dma-mapping.h>
58#include <asm/dma.h>
59#include <asm/portmux.h>
60
61#include <mach/bf54x-lq043.h>
62
63#define NO_BL_SUPPORT
64
65#define DRIVER_NAME "bf54x-lq043"
66static char driver_name[] = DRIVER_NAME;
67
68#define BFIN_LCD_NBR_PALETTE_ENTRIES 256
69
70#define EPPI0_18 {P_PPI0_CLK, P_PPI0_FS1, P_PPI0_FS2, P_PPI0_D0, P_PPI0_D1, P_PPI0_D2, P_PPI0_D3, \
71 P_PPI0_D4, P_PPI0_D5, P_PPI0_D6, P_PPI0_D7, P_PPI0_D8, P_PPI0_D9, P_PPI0_D10, \
72 P_PPI0_D11, P_PPI0_D12, P_PPI0_D13, P_PPI0_D14, P_PPI0_D15, P_PPI0_D16, P_PPI0_D17, 0}
73
74#define EPPI0_24 {P_PPI0_D18, P_PPI0_D19, P_PPI0_D20, P_PPI0_D21, P_PPI0_D22, P_PPI0_D23, 0}
75
76struct bfin_bf54xfb_info {
77 struct fb_info *fb;
78 struct device *dev;
79
80 struct bfin_bf54xfb_mach_info *mach_info;
81
82 unsigned char *fb_buffer;
83
84 dma_addr_t dma_handle;
85 int lq043_open_cnt;
86 int irq;
87 spinlock_t lock;
88};
89
90static int nocursor;
91module_param(nocursor, int, 0644);
92MODULE_PARM_DESC(nocursor, "cursor enable/disable");
93
94static int outp_rgb666;
95module_param(outp_rgb666, int, 0);
96MODULE_PARM_DESC(outp_rgb666, "Output 18-bit RGB666");
97
98#define LCD_X_RES 480
99#define LCD_Y_RES 272
100
101#define LCD_BPP 24
102#define DMA_BUS_SIZE 32
103
104
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123
124
125#define LCD_CLK (8*1000*1000)
126
127
128#define EPPI_HCOUNT LCD_X_RES
129
130
131#define EPPI_VCOUNT LCD_Y_RES
132
133
134#define EPPI_LINE 525
135
136
137#define EPPI_FRAME 286
138
139
140#define EPPI_FS1W_HBL 41
141
142
143#define EPPI_FS1P_AVPL EPPI_LINE
144
145
146#define EPPI_HDELAY 43
147
148
149#define EPPI_FS2W_LVB (EPPI_LINE * 10)
150
151
152#define EPPI_FS2P_LAVF (EPPI_LINE * EPPI_FRAME)
153
154
155#define EPPI_VDELAY 12
156
157#define EPPI_CLIP 0xFF00FF00
158
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171
172
173
174#define EPPI_CONTROL (0x20136E2E | SWAPEN)
175
176static inline u16 get_eppi_clkdiv(u32 target_ppi_clk)
177{
178 u32 sclk = get_sclk();
179
180
181
182 return (((sclk / target_ppi_clk) / 2) - 1);
183}
184
185static void config_ppi(struct bfin_bf54xfb_info *fbi)
186{
187
188 u16 eppi_clkdiv = get_eppi_clkdiv(LCD_CLK);
189
190 bfin_write_EPPI0_FS1W_HBL(EPPI_FS1W_HBL);
191 bfin_write_EPPI0_FS1P_AVPL(EPPI_FS1P_AVPL);
192 bfin_write_EPPI0_FS2W_LVB(EPPI_FS2W_LVB);
193 bfin_write_EPPI0_FS2P_LAVF(EPPI_FS2P_LAVF);
194 bfin_write_EPPI0_CLIP(EPPI_CLIP);
195
196 bfin_write_EPPI0_FRAME(EPPI_FRAME);
197 bfin_write_EPPI0_LINE(EPPI_LINE);
198
199 bfin_write_EPPI0_HCOUNT(EPPI_HCOUNT);
200 bfin_write_EPPI0_HDELAY(EPPI_HDELAY);
201 bfin_write_EPPI0_VCOUNT(EPPI_VCOUNT);
202 bfin_write_EPPI0_VDELAY(EPPI_VDELAY);
203
204 bfin_write_EPPI0_CLKDIV(eppi_clkdiv);
205
206
207
208
209
210 if (outp_rgb666)
211 bfin_write_EPPI0_CONTROL((EPPI_CONTROL & ~DLENGTH) | DLEN_18 |
212 RGB_FMT_EN);
213 else
214 bfin_write_EPPI0_CONTROL(((EPPI_CONTROL & ~DLENGTH) | DLEN_24) &
215 ~RGB_FMT_EN);
216
217
218}
219
220static int config_dma(struct bfin_bf54xfb_info *fbi)
221{
222
223 set_dma_config(CH_EPPI0,
224 set_bfin_dma_config(DIR_READ, DMA_FLOW_AUTO,
225 INTR_DISABLE, DIMENSION_2D,
226 DATA_SIZE_32,
227 DMA_NOSYNC_KEEP_DMA_BUF));
228 set_dma_x_count(CH_EPPI0, (LCD_X_RES * LCD_BPP) / DMA_BUS_SIZE);
229 set_dma_x_modify(CH_EPPI0, DMA_BUS_SIZE / 8);
230 set_dma_y_count(CH_EPPI0, LCD_Y_RES);
231 set_dma_y_modify(CH_EPPI0, DMA_BUS_SIZE / 8);
232 set_dma_start_addr(CH_EPPI0, (unsigned long)fbi->fb_buffer);
233
234 return 0;
235}
236
237static int request_ports(struct bfin_bf54xfb_info *fbi)
238{
239
240 u16 eppi_req_18[] = EPPI0_18;
241 u16 disp = fbi->mach_info->disp;
242
243 if (gpio_request_one(disp, GPIOF_OUT_INIT_HIGH, DRIVER_NAME)) {
244 printk(KERN_ERR "Requesting GPIO %d failed\n", disp);
245 return -EFAULT;
246 }
247
248 if (peripheral_request_list(eppi_req_18, DRIVER_NAME)) {
249 printk(KERN_ERR "Requesting Peripherals failed\n");
250 gpio_free(disp);
251 return -EFAULT;
252 }
253
254 if (!outp_rgb666) {
255
256 u16 eppi_req_24[] = EPPI0_24;
257
258 if (peripheral_request_list(eppi_req_24, DRIVER_NAME)) {
259 printk(KERN_ERR "Requesting Peripherals failed\n");
260 peripheral_free_list(eppi_req_18);
261 gpio_free(disp);
262 return -EFAULT;
263 }
264 }
265
266 return 0;
267}
268
269static void free_ports(struct bfin_bf54xfb_info *fbi)
270{
271
272 u16 eppi_req_18[] = EPPI0_18;
273
274 gpio_free(fbi->mach_info->disp);
275
276 peripheral_free_list(eppi_req_18);
277
278 if (!outp_rgb666) {
279 u16 eppi_req_24[] = EPPI0_24;
280 peripheral_free_list(eppi_req_24);
281 }
282}
283
284static int bfin_bf54x_fb_open(struct fb_info *info, int user)
285{
286 struct bfin_bf54xfb_info *fbi = info->par;
287
288 spin_lock(&fbi->lock);
289 fbi->lq043_open_cnt++;
290
291 if (fbi->lq043_open_cnt <= 1) {
292
293 bfin_write_EPPI0_CONTROL(0);
294 SSYNC();
295
296 config_dma(fbi);
297 config_ppi(fbi);
298
299
300 enable_dma(CH_EPPI0);
301 bfin_write_EPPI0_CONTROL(bfin_read_EPPI0_CONTROL() | EPPI_EN);
302 }
303
304 spin_unlock(&fbi->lock);
305
306 return 0;
307}
308
309static int bfin_bf54x_fb_release(struct fb_info *info, int user)
310{
311 struct bfin_bf54xfb_info *fbi = info->par;
312
313 spin_lock(&fbi->lock);
314
315 fbi->lq043_open_cnt--;
316
317 if (fbi->lq043_open_cnt <= 0) {
318
319 bfin_write_EPPI0_CONTROL(0);
320 SSYNC();
321 disable_dma(CH_EPPI0);
322 }
323
324 spin_unlock(&fbi->lock);
325
326 return 0;
327}
328
329static int bfin_bf54x_fb_check_var(struct fb_var_screeninfo *var,
330 struct fb_info *info)
331{
332
333 switch (var->bits_per_pixel) {
334 case 24:
335 var->red.offset = 16;
336 var->green.offset = 8;
337 var->blue.offset = 0;
338 var->red.length = var->green.length = var->blue.length = 8;
339 var->transp.offset = 0;
340 var->transp.length = 0;
341 var->transp.msb_right = 0;
342 var->red.msb_right = 0;
343 var->green.msb_right = 0;
344 var->blue.msb_right = 0;
345 break;
346 default:
347 pr_debug("%s: depth not supported: %u BPP\n", __func__,
348 var->bits_per_pixel);
349 return -EINVAL;
350 }
351
352 if (info->var.xres != var->xres || info->var.yres != var->yres ||
353 info->var.xres_virtual != var->xres_virtual ||
354 info->var.yres_virtual != var->yres_virtual) {
355 pr_debug("%s: Resolution not supported: X%u x Y%u \n",
356 __func__, var->xres, var->yres);
357 return -EINVAL;
358 }
359
360
361
362
363
364 if ((info->fix.line_length * var->yres_virtual) > info->fix.smem_len) {
365 pr_debug("%s: Memory Limit requested yres_virtual = %u\n",
366 __func__, var->yres_virtual);
367 return -ENOMEM;
368 }
369
370 return 0;
371}
372
373int bfin_bf54x_fb_cursor(struct fb_info *info, struct fb_cursor *cursor)
374{
375 if (nocursor)
376 return 0;
377 else
378 return -EINVAL;
379}
380
381static int bfin_bf54x_fb_setcolreg(u_int regno, u_int red, u_int green,
382 u_int blue, u_int transp,
383 struct fb_info *info)
384{
385 if (regno >= BFIN_LCD_NBR_PALETTE_ENTRIES)
386 return -EINVAL;
387
388 if (info->var.grayscale) {
389
390 red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
391 }
392
393 if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
394
395 u32 value;
396
397 if (regno > 16)
398 return -EINVAL;
399
400 red >>= (16 - info->var.red.length);
401 green >>= (16 - info->var.green.length);
402 blue >>= (16 - info->var.blue.length);
403
404 value = (red << info->var.red.offset) |
405 (green << info->var.green.offset) |
406 (blue << info->var.blue.offset);
407 value &= 0xFFFFFF;
408
409 ((u32 *) (info->pseudo_palette))[regno] = value;
410
411 }
412
413 return 0;
414}
415
416static struct fb_ops bfin_bf54x_fb_ops = {
417 .owner = THIS_MODULE,
418 .fb_open = bfin_bf54x_fb_open,
419 .fb_release = bfin_bf54x_fb_release,
420 .fb_check_var = bfin_bf54x_fb_check_var,
421 .fb_fillrect = cfb_fillrect,
422 .fb_copyarea = cfb_copyarea,
423 .fb_imageblit = cfb_imageblit,
424 .fb_cursor = bfin_bf54x_fb_cursor,
425 .fb_setcolreg = bfin_bf54x_fb_setcolreg,
426};
427
428#ifndef NO_BL_SUPPORT
429static int bl_get_brightness(struct backlight_device *bd)
430{
431 return 0;
432}
433
434static const struct backlight_ops bfin_lq043fb_bl_ops = {
435 .get_brightness = bl_get_brightness,
436};
437
438static struct backlight_device *bl_dev;
439
440static int bfin_lcd_get_power(struct lcd_device *dev)
441{
442 return 0;
443}
444
445static int bfin_lcd_set_power(struct lcd_device *dev, int power)
446{
447 return 0;
448}
449
450static int bfin_lcd_get_contrast(struct lcd_device *dev)
451{
452 return 0;
453}
454
455static int bfin_lcd_set_contrast(struct lcd_device *dev, int contrast)
456{
457
458 return 0;
459}
460
461static int bfin_lcd_check_fb(struct lcd_device *dev, struct fb_info *fi)
462{
463 if (!fi || (fi == &bfin_bf54x_fb))
464 return 1;
465 return 0;
466}
467
468static struct lcd_ops bfin_lcd_ops = {
469 .get_power = bfin_lcd_get_power,
470 .set_power = bfin_lcd_set_power,
471 .get_contrast = bfin_lcd_get_contrast,
472 .set_contrast = bfin_lcd_set_contrast,
473 .check_fb = bfin_lcd_check_fb,
474};
475
476static struct lcd_device *lcd_dev;
477#endif
478
479static irqreturn_t bfin_bf54x_irq_error(int irq, void *dev_id)
480{
481
482
483 u16 status = bfin_read_EPPI0_STATUS();
484
485 bfin_write_EPPI0_STATUS(0xFFFF);
486
487 if (status) {
488 bfin_write_EPPI0_CONTROL(bfin_read_EPPI0_CONTROL() & ~EPPI_EN);
489 disable_dma(CH_EPPI0);
490
491
492 enable_dma(CH_EPPI0);
493 bfin_write_EPPI0_CONTROL(bfin_read_EPPI0_CONTROL() | EPPI_EN);
494 bfin_write_EPPI0_STATUS(0xFFFF);
495 }
496
497 return IRQ_HANDLED;
498}
499
500static int bfin_bf54x_probe(struct platform_device *pdev)
501{
502#ifndef NO_BL_SUPPORT
503 struct backlight_properties props;
504#endif
505 struct bfin_bf54xfb_info *info;
506 struct fb_info *fbinfo;
507 int ret;
508
509 printk(KERN_INFO DRIVER_NAME ": FrameBuffer initializing...\n");
510
511 if (request_dma(CH_EPPI0, "CH_EPPI0") < 0) {
512 printk(KERN_ERR DRIVER_NAME
513 ": couldn't request CH_EPPI0 DMA\n");
514 ret = -EFAULT;
515 goto out1;
516 }
517
518 fbinfo =
519 framebuffer_alloc(sizeof(struct bfin_bf54xfb_info), &pdev->dev);
520 if (!fbinfo) {
521 ret = -ENOMEM;
522 goto out2;
523 }
524
525 info = fbinfo->par;
526 info->fb = fbinfo;
527 info->dev = &pdev->dev;
528 spin_lock_init(&info->lock);
529
530 platform_set_drvdata(pdev, fbinfo);
531
532 strcpy(fbinfo->fix.id, driver_name);
533
534 info->mach_info = pdev->dev.platform_data;
535
536 if (info->mach_info == NULL) {
537 dev_err(&pdev->dev,
538 "no platform data for lcd, cannot attach\n");
539 ret = -EINVAL;
540 goto out3;
541 }
542
543 fbinfo->fix.type = FB_TYPE_PACKED_PIXELS;
544 fbinfo->fix.type_aux = 0;
545 fbinfo->fix.xpanstep = 0;
546 fbinfo->fix.ypanstep = 0;
547 fbinfo->fix.ywrapstep = 0;
548 fbinfo->fix.accel = FB_ACCEL_NONE;
549 fbinfo->fix.visual = FB_VISUAL_TRUECOLOR;
550
551 fbinfo->var.nonstd = 0;
552 fbinfo->var.activate = FB_ACTIVATE_NOW;
553 fbinfo->var.height = info->mach_info->height;
554 fbinfo->var.width = info->mach_info->width;
555 fbinfo->var.accel_flags = 0;
556 fbinfo->var.vmode = FB_VMODE_NONINTERLACED;
557
558 fbinfo->fbops = &bfin_bf54x_fb_ops;
559 fbinfo->flags = FBINFO_FLAG_DEFAULT;
560
561 fbinfo->var.xres = info->mach_info->xres.defval;
562 fbinfo->var.xres_virtual = info->mach_info->xres.defval;
563 fbinfo->var.yres = info->mach_info->yres.defval;
564 fbinfo->var.yres_virtual = info->mach_info->yres.defval;
565 fbinfo->var.bits_per_pixel = info->mach_info->bpp.defval;
566
567 fbinfo->var.upper_margin = 0;
568 fbinfo->var.lower_margin = 0;
569 fbinfo->var.vsync_len = 0;
570
571 fbinfo->var.left_margin = 0;
572 fbinfo->var.right_margin = 0;
573 fbinfo->var.hsync_len = 0;
574
575 fbinfo->var.red.offset = 16;
576 fbinfo->var.green.offset = 8;
577 fbinfo->var.blue.offset = 0;
578 fbinfo->var.transp.offset = 0;
579 fbinfo->var.red.length = 8;
580 fbinfo->var.green.length = 8;
581 fbinfo->var.blue.length = 8;
582 fbinfo->var.transp.length = 0;
583 fbinfo->fix.smem_len = info->mach_info->xres.max *
584 info->mach_info->yres.max * info->mach_info->bpp.max / 8;
585
586 fbinfo->fix.line_length = fbinfo->var.xres_virtual *
587 fbinfo->var.bits_per_pixel / 8;
588
589 info->fb_buffer =
590 dma_alloc_coherent(NULL, fbinfo->fix.smem_len, &info->dma_handle,
591 GFP_KERNEL);
592
593 if (NULL == info->fb_buffer) {
594 printk(KERN_ERR DRIVER_NAME
595 ": couldn't allocate dma buffer.\n");
596 ret = -ENOMEM;
597 goto out3;
598 }
599
600 fbinfo->screen_base = (void *)info->fb_buffer;
601 fbinfo->fix.smem_start = (int)info->fb_buffer;
602
603 fbinfo->fbops = &bfin_bf54x_fb_ops;
604
605 fbinfo->pseudo_palette = devm_kzalloc(&pdev->dev, sizeof(u32) * 16,
606 GFP_KERNEL);
607 if (!fbinfo->pseudo_palette) {
608 printk(KERN_ERR DRIVER_NAME
609 "Fail to allocate pseudo_palette\n");
610
611 ret = -ENOMEM;
612 goto out4;
613 }
614
615 if (fb_alloc_cmap(&fbinfo->cmap, BFIN_LCD_NBR_PALETTE_ENTRIES, 0)
616 < 0) {
617 printk(KERN_ERR DRIVER_NAME
618 "Fail to allocate colormap (%d entries)\n",
619 BFIN_LCD_NBR_PALETTE_ENTRIES);
620 ret = -EFAULT;
621 goto out4;
622 }
623
624 if (request_ports(info)) {
625 printk(KERN_ERR DRIVER_NAME ": couldn't request gpio port.\n");
626 ret = -EFAULT;
627 goto out6;
628 }
629
630 info->irq = platform_get_irq(pdev, 0);
631 if (info->irq < 0) {
632 ret = -EINVAL;
633 goto out7;
634 }
635
636 if (request_irq(info->irq, bfin_bf54x_irq_error, 0,
637 "PPI ERROR", info) < 0) {
638 printk(KERN_ERR DRIVER_NAME
639 ": unable to request PPI ERROR IRQ\n");
640 ret = -EFAULT;
641 goto out7;
642 }
643
644 if (register_framebuffer(fbinfo) < 0) {
645 printk(KERN_ERR DRIVER_NAME
646 ": unable to register framebuffer.\n");
647 ret = -EINVAL;
648 goto out8;
649 }
650#ifndef NO_BL_SUPPORT
651 memset(&props, 0, sizeof(struct backlight_properties));
652 props.type = BACKLIGHT_RAW;
653 props.max_brightness = 255;
654 bl_dev = backlight_device_register("bf54x-bl", NULL, NULL,
655 &bfin_lq043fb_bl_ops, &props);
656 if (IS_ERR(bl_dev)) {
657 printk(KERN_ERR DRIVER_NAME
658 ": unable to register backlight.\n");
659 ret = -EINVAL;
660 unregister_framebuffer(fbinfo);
661 goto out8;
662 }
663
664 lcd_dev = lcd_device_register(DRIVER_NAME, &pdev->dev, NULL, &bfin_lcd_ops);
665 lcd_dev->props.max_contrast = 255, printk(KERN_INFO "Done.\n");
666#endif
667
668 return 0;
669
670out8:
671 free_irq(info->irq, info);
672out7:
673 free_ports(info);
674out6:
675 fb_dealloc_cmap(&fbinfo->cmap);
676out4:
677 dma_free_coherent(NULL, fbinfo->fix.smem_len, info->fb_buffer,
678 info->dma_handle);
679out3:
680 framebuffer_release(fbinfo);
681out2:
682 free_dma(CH_EPPI0);
683out1:
684
685 return ret;
686}
687
688static int bfin_bf54x_remove(struct platform_device *pdev)
689{
690
691 struct fb_info *fbinfo = platform_get_drvdata(pdev);
692 struct bfin_bf54xfb_info *info = fbinfo->par;
693
694 free_dma(CH_EPPI0);
695 free_irq(info->irq, info);
696
697 if (info->fb_buffer != NULL)
698 dma_free_coherent(NULL, fbinfo->fix.smem_len, info->fb_buffer,
699 info->dma_handle);
700
701 fb_dealloc_cmap(&fbinfo->cmap);
702
703#ifndef NO_BL_SUPPORT
704 lcd_device_unregister(lcd_dev);
705 backlight_device_unregister(bl_dev);
706#endif
707
708 unregister_framebuffer(fbinfo);
709
710 free_ports(info);
711
712 printk(KERN_INFO DRIVER_NAME ": Unregister LCD driver.\n");
713
714 return 0;
715}
716
717#ifdef CONFIG_PM
718static int bfin_bf54x_suspend(struct platform_device *pdev, pm_message_t state)
719{
720 bfin_write_EPPI0_CONTROL(bfin_read_EPPI0_CONTROL() & ~EPPI_EN);
721 disable_dma(CH_EPPI0);
722 bfin_write_EPPI0_STATUS(0xFFFF);
723
724 return 0;
725}
726
727static int bfin_bf54x_resume(struct platform_device *pdev)
728{
729 struct fb_info *fbinfo = platform_get_drvdata(pdev);
730 struct bfin_bf54xfb_info *info = fbinfo->par;
731
732 if (info->lq043_open_cnt) {
733
734 bfin_write_EPPI0_CONTROL(0);
735 SSYNC();
736
737 config_dma(info);
738 config_ppi(info);
739
740
741 enable_dma(CH_EPPI0);
742 bfin_write_EPPI0_CONTROL(bfin_read_EPPI0_CONTROL() | EPPI_EN);
743 }
744
745 return 0;
746}
747#else
748#define bfin_bf54x_suspend NULL
749#define bfin_bf54x_resume NULL
750#endif
751
752static struct platform_driver bfin_bf54x_driver = {
753 .probe = bfin_bf54x_probe,
754 .remove = bfin_bf54x_remove,
755 .suspend = bfin_bf54x_suspend,
756 .resume = bfin_bf54x_resume,
757 .driver = {
758 .name = DRIVER_NAME,
759 .owner = THIS_MODULE,
760 },
761};
762module_platform_driver(bfin_bf54x_driver);
763
764MODULE_DESCRIPTION("Blackfin BF54x TFT LCD Driver");
765MODULE_LICENSE("GPL");
766
