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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/gfp.h>
36#include <linux/fb.h>
37#include <linux/init.h>
38#include <linux/types.h>
39#include <linux/interrupt.h>
40#include <linux/device.h>
41#include <linux/backlight.h>
42#include <linux/lcd.h>
43#include <linux/dma-mapping.h>
44#include <linux/platform_device.h>
45
46#include <asm/blackfin.h>
47#include <asm/irq.h>
48#include <asm/dma-mapping.h>
49#include <asm/dma.h>
50#include <asm/portmux.h>
51#include <asm/gptimers.h>
52
53#define NO_BL_SUPPORT
54
55#define LCD_X_RES 320
56#define LCD_Y_RES 240
57#define LCD_BPP 24
58
59#define DMA_BUS_SIZE 16
60#define LCD_CLK (12*1000*1000)
61
62#define CLOCKS_PER_PIX 3
63
64
65
66
67
68#define U_LINE 1
69
70#define H_ACTPIX (LCD_X_RES * CLOCKS_PER_PIX)
71#define H_PERIOD (408 * CLOCKS_PER_PIX)
72#define H_PULSE 90
73#define H_START 204
74
75#define V_LINES (LCD_Y_RES + U_LINE)
76#define V_PULSE (3 * H_PERIOD)
77#define V_PERIOD (H_PERIOD * V_LINES)
78
79#define ACTIVE_VIDEO_MEM_OFFSET (U_LINE * H_ACTPIX)
80
81#define BFIN_LCD_NBR_PALETTE_ENTRIES 256
82
83#define DRIVER_NAME "bfin-t350mcqb"
84static char driver_name[] = DRIVER_NAME;
85
86struct bfin_t350mcqbfb_info {
87 struct fb_info *fb;
88 struct device *dev;
89 unsigned char *fb_buffer;
90 dma_addr_t dma_handle;
91 int lq043_open_cnt;
92 int irq;
93 spinlock_t lock;
94 u32 pseudo_pal[16];
95};
96
97static int nocursor;
98module_param(nocursor, int, 0644);
99MODULE_PARM_DESC(nocursor, "cursor enable/disable");
100
101#define PPI_TX_MODE 0x2
102#define PPI_XFER_TYPE_11 0xC
103#define PPI_PORT_CFG_01 0x10
104#define PPI_PACK_EN 0x80
105#define PPI_POLS_1 0x8000
106
107static void bfin_t350mcqb_config_ppi(struct bfin_t350mcqbfb_info *fbi)
108{
109 bfin_write_PPI_DELAY(H_START);
110 bfin_write_PPI_COUNT(H_ACTPIX-1);
111 bfin_write_PPI_FRAME(V_LINES);
112
113 bfin_write_PPI_CONTROL(PPI_TX_MODE |
114 PPI_XFER_TYPE_11 |
115 PPI_PORT_CFG_01 |
116 PPI_PACK_EN |
117 PPI_POLS_1);
118}
119
120static inline void bfin_t350mcqb_disable_ppi(void)
121{
122 bfin_write_PPI_CONTROL(bfin_read_PPI_CONTROL() & ~PORT_EN);
123}
124
125static inline void bfin_t350mcqb_enable_ppi(void)
126{
127 bfin_write_PPI_CONTROL(bfin_read_PPI_CONTROL() | PORT_EN);
128}
129
130static void bfin_t350mcqb_start_timers(void)
131{
132 unsigned long flags;
133
134 local_irq_save(flags);
135 enable_gptimers(TIMER1bit);
136 enable_gptimers(TIMER0bit);
137 local_irq_restore(flags);
138}
139
140static void bfin_t350mcqb_stop_timers(void)
141{
142 disable_gptimers(TIMER0bit | TIMER1bit);
143
144 set_gptimer_status(0, TIMER_STATUS_TRUN0 | TIMER_STATUS_TRUN1 |
145 TIMER_STATUS_TIMIL0 | TIMER_STATUS_TIMIL1 |
146 TIMER_STATUS_TOVF0 | TIMER_STATUS_TOVF1);
147
148}
149
150static void bfin_t350mcqb_init_timers(void)
151{
152
153 bfin_t350mcqb_stop_timers();
154
155 set_gptimer_period(TIMER0_id, H_PERIOD);
156 set_gptimer_pwidth(TIMER0_id, H_PULSE);
157 set_gptimer_config(TIMER0_id, TIMER_MODE_PWM | TIMER_PERIOD_CNT |
158 TIMER_TIN_SEL | TIMER_CLK_SEL|
159 TIMER_EMU_RUN);
160
161 set_gptimer_period(TIMER1_id, V_PERIOD);
162 set_gptimer_pwidth(TIMER1_id, V_PULSE);
163 set_gptimer_config(TIMER1_id, TIMER_MODE_PWM | TIMER_PERIOD_CNT |
164 TIMER_TIN_SEL | TIMER_CLK_SEL |
165 TIMER_EMU_RUN);
166
167}
168
169static void bfin_t350mcqb_config_dma(struct bfin_t350mcqbfb_info *fbi)
170{
171
172 set_dma_config(CH_PPI,
173 set_bfin_dma_config(DIR_READ, DMA_FLOW_AUTO,
174 INTR_DISABLE, DIMENSION_2D,
175 DATA_SIZE_16,
176 DMA_NOSYNC_KEEP_DMA_BUF));
177 set_dma_x_count(CH_PPI, (LCD_X_RES * LCD_BPP) / DMA_BUS_SIZE);
178 set_dma_x_modify(CH_PPI, DMA_BUS_SIZE / 8);
179 set_dma_y_count(CH_PPI, V_LINES);
180
181 set_dma_y_modify(CH_PPI, DMA_BUS_SIZE / 8);
182 set_dma_start_addr(CH_PPI, (unsigned long)fbi->fb_buffer);
183
184}
185
186static u16 ppi0_req_8[] = {P_PPI0_CLK, P_PPI0_FS1, P_PPI0_FS2,
187 P_PPI0_D0, P_PPI0_D1, P_PPI0_D2,
188 P_PPI0_D3, P_PPI0_D4, P_PPI0_D5,
189 P_PPI0_D6, P_PPI0_D7, 0};
190
191static int bfin_t350mcqb_request_ports(int action)
192{
193 if (action) {
194 if (peripheral_request_list(ppi0_req_8, DRIVER_NAME)) {
195 printk(KERN_ERR "Requesting Peripherals failed\n");
196 return -EFAULT;
197 }
198 } else
199 peripheral_free_list(ppi0_req_8);
200
201 return 0;
202}
203
204static int bfin_t350mcqb_fb_open(struct fb_info *info, int user)
205{
206 struct bfin_t350mcqbfb_info *fbi = info->par;
207
208 spin_lock(&fbi->lock);
209 fbi->lq043_open_cnt++;
210
211 if (fbi->lq043_open_cnt <= 1) {
212
213 bfin_t350mcqb_disable_ppi();
214 SSYNC();
215
216 bfin_t350mcqb_config_dma(fbi);
217 bfin_t350mcqb_config_ppi(fbi);
218 bfin_t350mcqb_init_timers();
219
220
221 enable_dma(CH_PPI);
222 bfin_t350mcqb_enable_ppi();
223 bfin_t350mcqb_start_timers();
224 }
225
226 spin_unlock(&fbi->lock);
227
228 return 0;
229}
230
231static int bfin_t350mcqb_fb_release(struct fb_info *info, int user)
232{
233 struct bfin_t350mcqbfb_info *fbi = info->par;
234
235 spin_lock(&fbi->lock);
236
237 fbi->lq043_open_cnt--;
238
239 if (fbi->lq043_open_cnt <= 0) {
240 bfin_t350mcqb_disable_ppi();
241 SSYNC();
242 disable_dma(CH_PPI);
243 bfin_t350mcqb_stop_timers();
244 }
245
246 spin_unlock(&fbi->lock);
247
248 return 0;
249}
250
251static int bfin_t350mcqb_fb_check_var(struct fb_var_screeninfo *var,
252 struct fb_info *info)
253{
254
255 switch (var->bits_per_pixel) {
256 case 24:
257 var->red.offset = 0;
258 var->green.offset = 8;
259 var->blue.offset = 16;
260 var->red.length = var->green.length = var->blue.length = 8;
261 var->transp.offset = 0;
262 var->transp.length = 0;
263 var->transp.msb_right = 0;
264 var->red.msb_right = 0;
265 var->green.msb_right = 0;
266 var->blue.msb_right = 0;
267 break;
268 default:
269 pr_debug("%s: depth not supported: %u BPP\n", __func__,
270 var->bits_per_pixel);
271 return -EINVAL;
272 }
273
274 if (info->var.xres != var->xres || info->var.yres != var->yres ||
275 info->var.xres_virtual != var->xres_virtual ||
276 info->var.yres_virtual != var->yres_virtual) {
277 pr_debug("%s: Resolution not supported: X%u x Y%u \n",
278 __func__, var->xres, var->yres);
279 return -EINVAL;
280 }
281
282
283
284
285
286 if ((info->fix.line_length * var->yres_virtual) > info->fix.smem_len) {
287 pr_debug("%s: Memory Limit requested yres_virtual = %u\n",
288 __func__, var->yres_virtual);
289 return -ENOMEM;
290 }
291
292 return 0;
293}
294
295int bfin_t350mcqb_fb_cursor(struct fb_info *info, struct fb_cursor *cursor)
296{
297 if (nocursor)
298 return 0;
299 else
300 return -EINVAL;
301}
302
303static int bfin_t350mcqb_fb_setcolreg(u_int regno, u_int red, u_int green,
304 u_int blue, u_int transp,
305 struct fb_info *info)
306{
307 if (regno >= BFIN_LCD_NBR_PALETTE_ENTRIES)
308 return -EINVAL;
309
310 if (info->var.grayscale) {
311
312 red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
313 }
314
315 if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
316
317 u32 value;
318
319 if (regno > 16)
320 return -EINVAL;
321
322 red >>= (16 - info->var.red.length);
323 green >>= (16 - info->var.green.length);
324 blue >>= (16 - info->var.blue.length);
325
326 value = (red << info->var.red.offset) |
327 (green << info->var.green.offset) |
328 (blue << info->var.blue.offset);
329 value &= 0xFFFFFF;
330
331 ((u32 *) (info->pseudo_palette))[regno] = value;
332
333 }
334
335 return 0;
336}
337
338static struct fb_ops bfin_t350mcqb_fb_ops = {
339 .owner = THIS_MODULE,
340 .fb_open = bfin_t350mcqb_fb_open,
341 .fb_release = bfin_t350mcqb_fb_release,
342 .fb_check_var = bfin_t350mcqb_fb_check_var,
343 .fb_fillrect = cfb_fillrect,
344 .fb_copyarea = cfb_copyarea,
345 .fb_imageblit = cfb_imageblit,
346 .fb_cursor = bfin_t350mcqb_fb_cursor,
347 .fb_setcolreg = bfin_t350mcqb_fb_setcolreg,
348};
349
350#ifndef NO_BL_SUPPORT
351static int bl_get_brightness(struct backlight_device *bd)
352{
353 return 0;
354}
355
356static const struct backlight_ops bfin_lq043fb_bl_ops = {
357 .get_brightness = bl_get_brightness,
358};
359
360static struct backlight_device *bl_dev;
361
362static int bfin_lcd_get_power(struct lcd_device *dev)
363{
364 return 0;
365}
366
367static int bfin_lcd_set_power(struct lcd_device *dev, int power)
368{
369 return 0;
370}
371
372static int bfin_lcd_get_contrast(struct lcd_device *dev)
373{
374 return 0;
375}
376
377static int bfin_lcd_set_contrast(struct lcd_device *dev, int contrast)
378{
379
380 return 0;
381}
382
383static int bfin_lcd_check_fb(struct lcd_device *dev, struct fb_info *fi)
384{
385 if (!fi || (fi == &bfin_t350mcqb_fb))
386 return 1;
387 return 0;
388}
389
390static struct lcd_ops bfin_lcd_ops = {
391 .get_power = bfin_lcd_get_power,
392 .set_power = bfin_lcd_set_power,
393 .get_contrast = bfin_lcd_get_contrast,
394 .set_contrast = bfin_lcd_set_contrast,
395 .check_fb = bfin_lcd_check_fb,
396};
397
398static struct lcd_device *lcd_dev;
399#endif
400
401static irqreturn_t bfin_t350mcqb_irq_error(int irq, void *dev_id)
402{
403
404
405 u16 status = bfin_read_PPI_STATUS();
406 bfin_write_PPI_STATUS(0xFFFF);
407
408 if (status) {
409 bfin_t350mcqb_disable_ppi();
410 disable_dma(CH_PPI);
411
412
413 enable_dma(CH_PPI);
414 bfin_t350mcqb_enable_ppi();
415 bfin_write_PPI_STATUS(0xFFFF);
416 }
417
418 return IRQ_HANDLED;
419}
420
421static int bfin_t350mcqb_probe(struct platform_device *pdev)
422{
423#ifndef NO_BL_SUPPORT
424 struct backlight_properties props;
425#endif
426 struct bfin_t350mcqbfb_info *info;
427 struct fb_info *fbinfo;
428 int ret;
429
430 printk(KERN_INFO DRIVER_NAME ": %dx%d %d-bit RGB FrameBuffer initializing...\n",
431 LCD_X_RES, LCD_Y_RES, LCD_BPP);
432
433 if (request_dma(CH_PPI, "CH_PPI") < 0) {
434 printk(KERN_ERR DRIVER_NAME
435 ": couldn't request CH_PPI DMA\n");
436 ret = -EFAULT;
437 goto out1;
438 }
439
440 fbinfo =
441 framebuffer_alloc(sizeof(struct bfin_t350mcqbfb_info), &pdev->dev);
442 if (!fbinfo) {
443 ret = -ENOMEM;
444 goto out2;
445 }
446
447 info = fbinfo->par;
448 info->fb = fbinfo;
449 info->dev = &pdev->dev;
450 spin_lock_init(&info->lock);
451
452 platform_set_drvdata(pdev, fbinfo);
453
454 strcpy(fbinfo->fix.id, driver_name);
455
456 fbinfo->fix.type = FB_TYPE_PACKED_PIXELS;
457 fbinfo->fix.type_aux = 0;
458 fbinfo->fix.xpanstep = 0;
459 fbinfo->fix.ypanstep = 0;
460 fbinfo->fix.ywrapstep = 0;
461 fbinfo->fix.accel = FB_ACCEL_NONE;
462 fbinfo->fix.visual = FB_VISUAL_TRUECOLOR;
463
464 fbinfo->var.nonstd = 0;
465 fbinfo->var.activate = FB_ACTIVATE_NOW;
466 fbinfo->var.height = 53;
467 fbinfo->var.width = 70;
468 fbinfo->var.accel_flags = 0;
469 fbinfo->var.vmode = FB_VMODE_NONINTERLACED;
470
471 fbinfo->var.xres = LCD_X_RES;
472 fbinfo->var.xres_virtual = LCD_X_RES;
473 fbinfo->var.yres = LCD_Y_RES;
474 fbinfo->var.yres_virtual = LCD_Y_RES;
475 fbinfo->var.bits_per_pixel = LCD_BPP;
476
477 fbinfo->var.red.offset = 0;
478 fbinfo->var.green.offset = 8;
479 fbinfo->var.blue.offset = 16;
480 fbinfo->var.transp.offset = 0;
481 fbinfo->var.red.length = 8;
482 fbinfo->var.green.length = 8;
483 fbinfo->var.blue.length = 8;
484 fbinfo->var.transp.length = 0;
485 fbinfo->fix.smem_len = LCD_X_RES * LCD_Y_RES * LCD_BPP / 8;
486
487 fbinfo->fix.line_length = fbinfo->var.xres_virtual *
488 fbinfo->var.bits_per_pixel / 8;
489
490
491 fbinfo->fbops = &bfin_t350mcqb_fb_ops;
492 fbinfo->flags = FBINFO_FLAG_DEFAULT;
493
494 info->fb_buffer = dma_alloc_coherent(NULL, fbinfo->fix.smem_len +
495 ACTIVE_VIDEO_MEM_OFFSET,
496 &info->dma_handle, GFP_KERNEL);
497
498 if (NULL == info->fb_buffer) {
499 printk(KERN_ERR DRIVER_NAME
500 ": couldn't allocate dma buffer.\n");
501 ret = -ENOMEM;
502 goto out3;
503 }
504
505 fbinfo->screen_base = (void *)info->fb_buffer + ACTIVE_VIDEO_MEM_OFFSET;
506 fbinfo->fix.smem_start = (int)info->fb_buffer + ACTIVE_VIDEO_MEM_OFFSET;
507
508 fbinfo->fbops = &bfin_t350mcqb_fb_ops;
509
510 fbinfo->pseudo_palette = &info->pseudo_pal;
511
512 if (fb_alloc_cmap(&fbinfo->cmap, BFIN_LCD_NBR_PALETTE_ENTRIES, 0)
513 < 0) {
514 printk(KERN_ERR DRIVER_NAME
515 "Fail to allocate colormap (%d entries)\n",
516 BFIN_LCD_NBR_PALETTE_ENTRIES);
517 ret = -EFAULT;
518 goto out4;
519 }
520
521 if (bfin_t350mcqb_request_ports(1)) {
522 printk(KERN_ERR DRIVER_NAME ": couldn't request gpio port.\n");
523 ret = -EFAULT;
524 goto out6;
525 }
526
527 info->irq = platform_get_irq(pdev, 0);
528 if (info->irq < 0) {
529 ret = -EINVAL;
530 goto out7;
531 }
532
533 ret = request_irq(info->irq, bfin_t350mcqb_irq_error, 0,
534 "PPI ERROR", info);
535 if (ret < 0) {
536 printk(KERN_ERR DRIVER_NAME
537 ": unable to request PPI ERROR IRQ\n");
538 goto out7;
539 }
540
541 if (register_framebuffer(fbinfo) < 0) {
542 printk(KERN_ERR DRIVER_NAME
543 ": unable to register framebuffer.\n");
544 ret = -EINVAL;
545 goto out8;
546 }
547#ifndef NO_BL_SUPPORT
548 memset(&props, 0, sizeof(struct backlight_properties));
549 props.type = BACKLIGHT_RAW;
550 props.max_brightness = 255;
551 bl_dev = backlight_device_register("bf52x-bl", NULL, NULL,
552 &bfin_lq043fb_bl_ops, &props);
553 if (IS_ERR(bl_dev)) {
554 printk(KERN_ERR DRIVER_NAME
555 ": unable to register backlight.\n");
556 ret = -EINVAL;
557 unregister_framebuffer(fbinfo);
558 goto out8;
559 }
560
561 lcd_dev = lcd_device_register(DRIVER_NAME, NULL, &bfin_lcd_ops);
562 lcd_dev->props.max_contrast = 255, printk(KERN_INFO "Done.\n");
563#endif
564
565 return 0;
566
567out8:
568 free_irq(info->irq, info);
569out7:
570 bfin_t350mcqb_request_ports(0);
571out6:
572 fb_dealloc_cmap(&fbinfo->cmap);
573out4:
574 dma_free_coherent(NULL, fbinfo->fix.smem_len + ACTIVE_VIDEO_MEM_OFFSET,
575 info->fb_buffer, info->dma_handle);
576out3:
577 framebuffer_release(fbinfo);
578out2:
579 free_dma(CH_PPI);
580out1:
581 platform_set_drvdata(pdev, NULL);
582
583 return ret;
584}
585
586static int bfin_t350mcqb_remove(struct platform_device *pdev)
587{
588
589 struct fb_info *fbinfo = platform_get_drvdata(pdev);
590 struct bfin_t350mcqbfb_info *info = fbinfo->par;
591
592 unregister_framebuffer(fbinfo);
593
594 free_dma(CH_PPI);
595 free_irq(info->irq, info);
596
597 if (info->fb_buffer != NULL)
598 dma_free_coherent(NULL, fbinfo->fix.smem_len +
599 ACTIVE_VIDEO_MEM_OFFSET, info->fb_buffer,
600 info->dma_handle);
601
602 fb_dealloc_cmap(&fbinfo->cmap);
603
604#ifndef NO_BL_SUPPORT
605 lcd_device_unregister(lcd_dev);
606 backlight_device_unregister(bl_dev);
607#endif
608
609 bfin_t350mcqb_request_ports(0);
610
611 platform_set_drvdata(pdev, NULL);
612 framebuffer_release(fbinfo);
613
614 printk(KERN_INFO DRIVER_NAME ": Unregister LCD driver.\n");
615
616 return 0;
617}
618
619#ifdef CONFIG_PM
620static int bfin_t350mcqb_suspend(struct platform_device *pdev, pm_message_t state)
621{
622 struct fb_info *fbinfo = platform_get_drvdata(pdev);
623 struct bfin_t350mcqbfb_info *fbi = fbinfo->par;
624
625 if (fbi->lq043_open_cnt) {
626 bfin_t350mcqb_disable_ppi();
627 disable_dma(CH_PPI);
628 bfin_t350mcqb_stop_timers();
629 bfin_write_PPI_STATUS(-1);
630 }
631
632
633 return 0;
634}
635
636static int bfin_t350mcqb_resume(struct platform_device *pdev)
637{
638 struct fb_info *fbinfo = platform_get_drvdata(pdev);
639 struct bfin_t350mcqbfb_info *fbi = fbinfo->par;
640
641 if (fbi->lq043_open_cnt) {
642 bfin_t350mcqb_config_dma(fbi);
643 bfin_t350mcqb_config_ppi(fbi);
644 bfin_t350mcqb_init_timers();
645
646
647 enable_dma(CH_PPI);
648 bfin_t350mcqb_enable_ppi();
649 bfin_t350mcqb_start_timers();
650 }
651
652 return 0;
653}
654#else
655#define bfin_t350mcqb_suspend NULL
656#define bfin_t350mcqb_resume NULL
657#endif
658
659static struct platform_driver bfin_t350mcqb_driver = {
660 .probe = bfin_t350mcqb_probe,
661 .remove = bfin_t350mcqb_remove,
662 .suspend = bfin_t350mcqb_suspend,
663 .resume = bfin_t350mcqb_resume,
664 .driver = {
665 .name = DRIVER_NAME,
666 .owner = THIS_MODULE,
667 },
668};
669
670static int __init bfin_t350mcqb_driver_init(void)
671{
672 return platform_driver_register(&bfin_t350mcqb_driver);
673}
674
675static void __exit bfin_t350mcqb_driver_cleanup(void)
676{
677 platform_driver_unregister(&bfin_t350mcqb_driver);
678}
679
680MODULE_DESCRIPTION("Blackfin TFT LCD Driver");
681MODULE_LICENSE("GPL");
682
683module_init(bfin_t350mcqb_driver_init);
684module_exit(bfin_t350mcqb_driver_cleanup);
685
