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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/fb.h>
36#include <linux/init.h>
37#include <linux/types.h>
38#include <linux/interrupt.h>
39#include <linux/device.h>
40#include <linux/backlight.h>
41#include <linux/lcd.h>
42#include <linux/dma-mapping.h>
43#include <linux/platform_device.h>
44
45#include <asm/blackfin.h>
46#include <asm/irq.h>
47#include <asm/dma-mapping.h>
48#include <asm/dma.h>
49#include <asm/portmux.h>
50#include <asm/gptimers.h>
51
52#define NO_BL_SUPPORT
53
54#define LCD_X_RES 320
55#define LCD_Y_RES 240
56#define LCD_BPP 24
57
58#define DMA_BUS_SIZE 16
59#define LCD_CLK (12*1000*1000)
60
61#define CLOCKS_PER_PIX 3
62
63
64
65
66
67#define U_LINE 1
68
69#define H_ACTPIX (LCD_X_RES * CLOCKS_PER_PIX)
70#define H_PERIOD (408 * CLOCKS_PER_PIX)
71#define H_PULSE 90
72#define H_START 204
73
74#define V_LINES (LCD_Y_RES + U_LINE)
75#define V_PULSE (3 * H_PERIOD)
76#define V_PERIOD (H_PERIOD * V_LINES)
77
78#define ACTIVE_VIDEO_MEM_OFFSET (U_LINE * H_ACTPIX)
79
80#define BFIN_LCD_NBR_PALETTE_ENTRIES 256
81
82#define DRIVER_NAME "bfin-t350mcqb"
83static char driver_name[] = DRIVER_NAME;
84
85struct bfin_t350mcqbfb_info {
86 struct fb_info *fb;
87 struct device *dev;
88 unsigned char *fb_buffer;
89 dma_addr_t dma_handle;
90 int lq043_mmap;
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 faild\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 fbi->lq043_mmap = 0;
239
240 if (fbi->lq043_open_cnt <= 0) {
241 bfin_t350mcqb_disable_ppi();
242 SSYNC();
243 disable_dma(CH_PPI);
244 bfin_t350mcqb_stop_timers();
245 }
246
247 spin_unlock(&fbi->lock);
248
249 return 0;
250}
251
252static int bfin_t350mcqb_fb_check_var(struct fb_var_screeninfo *var,
253 struct fb_info *info)
254{
255
256 switch (var->bits_per_pixel) {
257 case 24:
258 var->red.offset = 0;
259 var->green.offset = 8;
260 var->blue.offset = 16;
261 var->red.length = var->green.length = var->blue.length = 8;
262 var->transp.offset = 0;
263 var->transp.length = 0;
264 var->transp.msb_right = 0;
265 var->red.msb_right = 0;
266 var->green.msb_right = 0;
267 var->blue.msb_right = 0;
268 break;
269 default:
270 pr_debug("%s: depth not supported: %u BPP\n", __func__,
271 var->bits_per_pixel);
272 return -EINVAL;
273 }
274
275 if (info->var.xres != var->xres || info->var.yres != var->yres ||
276 info->var.xres_virtual != var->xres_virtual ||
277 info->var.yres_virtual != var->yres_virtual) {
278 pr_debug("%s: Resolution not supported: X%u x Y%u \n",
279 __func__, var->xres, var->yres);
280 return -EINVAL;
281 }
282
283
284
285
286
287 if ((info->fix.line_length * var->yres_virtual) > info->fix.smem_len) {
288 pr_debug("%s: Memory Limit requested yres_virtual = %u\n",
289 __func__, var->yres_virtual);
290 return -ENOMEM;
291 }
292
293 return 0;
294}
295
296static int bfin_t350mcqb_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
297{
298 struct bfin_t350mcqbfb_info *fbi = info->par;
299
300 if (fbi->lq043_mmap)
301 return -1;
302
303 spin_lock(&fbi->lock);
304 fbi->lq043_mmap = 1;
305 spin_unlock(&fbi->lock);
306
307 vma->vm_start = (unsigned long)(fbi->fb_buffer + ACTIVE_VIDEO_MEM_OFFSET);
308
309 vma->vm_end = vma->vm_start + info->fix.smem_len;
310
311
312
313
314
315
316
317 vma->vm_flags |= VM_MAYSHARE | VM_SHARED;
318
319 return 0;
320}
321
322int bfin_t350mcqb_fb_cursor(struct fb_info *info, struct fb_cursor *cursor)
323{
324 if (nocursor)
325 return 0;
326 else
327 return -EINVAL;
328}
329
330static int bfin_t350mcqb_fb_setcolreg(u_int regno, u_int red, u_int green,
331 u_int blue, u_int transp,
332 struct fb_info *info)
333{
334 if (regno >= BFIN_LCD_NBR_PALETTE_ENTRIES)
335 return -EINVAL;
336
337 if (info->var.grayscale) {
338
339 red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
340 }
341
342 if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
343
344 u32 value;
345
346 if (regno > 16)
347 return -EINVAL;
348
349 red >>= (16 - info->var.red.length);
350 green >>= (16 - info->var.green.length);
351 blue >>= (16 - info->var.blue.length);
352
353 value = (red << info->var.red.offset) |
354 (green << info->var.green.offset) |
355 (blue << info->var.blue.offset);
356 value &= 0xFFFFFF;
357
358 ((u32 *) (info->pseudo_palette))[regno] = value;
359
360 }
361
362 return 0;
363}
364
365static struct fb_ops bfin_t350mcqb_fb_ops = {
366 .owner = THIS_MODULE,
367 .fb_open = bfin_t350mcqb_fb_open,
368 .fb_release = bfin_t350mcqb_fb_release,
369 .fb_check_var = bfin_t350mcqb_fb_check_var,
370 .fb_fillrect = cfb_fillrect,
371 .fb_copyarea = cfb_copyarea,
372 .fb_imageblit = cfb_imageblit,
373 .fb_mmap = bfin_t350mcqb_fb_mmap,
374 .fb_cursor = bfin_t350mcqb_fb_cursor,
375 .fb_setcolreg = bfin_t350mcqb_fb_setcolreg,
376};
377
378#ifndef NO_BL_SUPPORT
379static int bl_get_brightness(struct backlight_device *bd)
380{
381 return 0;
382}
383
384static struct backlight_ops bfin_lq043fb_bl_ops = {
385 .get_brightness = bl_get_brightness,
386};
387
388static struct backlight_device *bl_dev;
389
390static int bfin_lcd_get_power(struct lcd_device *dev)
391{
392 return 0;
393}
394
395static int bfin_lcd_set_power(struct lcd_device *dev, int power)
396{
397 return 0;
398}
399
400static int bfin_lcd_get_contrast(struct lcd_device *dev)
401{
402 return 0;
403}
404
405static int bfin_lcd_set_contrast(struct lcd_device *dev, int contrast)
406{
407
408 return 0;
409}
410
411static int bfin_lcd_check_fb(struct lcd_device *dev, struct fb_info *fi)
412{
413 if (!fi || (fi == &bfin_t350mcqb_fb))
414 return 1;
415 return 0;
416}
417
418static struct lcd_ops bfin_lcd_ops = {
419 .get_power = bfin_lcd_get_power,
420 .set_power = bfin_lcd_set_power,
421 .get_contrast = bfin_lcd_get_contrast,
422 .set_contrast = bfin_lcd_set_contrast,
423 .check_fb = bfin_lcd_check_fb,
424};
425
426static struct lcd_device *lcd_dev;
427#endif
428
429static irqreturn_t bfin_t350mcqb_irq_error(int irq, void *dev_id)
430{
431
432
433 u16 status = bfin_read_PPI_STATUS();
434 bfin_write_PPI_STATUS(0xFFFF);
435
436 if (status) {
437 bfin_t350mcqb_disable_ppi();
438 disable_dma(CH_PPI);
439
440
441 enable_dma(CH_PPI);
442 bfin_t350mcqb_enable_ppi();
443 bfin_write_PPI_STATUS(0xFFFF);
444 }
445
446 return IRQ_HANDLED;
447}
448
449static int __devinit bfin_t350mcqb_probe(struct platform_device *pdev)
450{
451 struct bfin_t350mcqbfb_info *info;
452 struct fb_info *fbinfo;
453 int ret;
454
455 printk(KERN_INFO DRIVER_NAME ": %dx%d %d-bit RGB FrameBuffer initializing...\n",
456 LCD_X_RES, LCD_Y_RES, LCD_BPP);
457
458 if (request_dma(CH_PPI, "CH_PPI") < 0) {
459 printk(KERN_ERR DRIVER_NAME
460 ": couldn't request CH_PPI DMA\n");
461 ret = -EFAULT;
462 goto out1;
463 }
464
465 fbinfo =
466 framebuffer_alloc(sizeof(struct bfin_t350mcqbfb_info), &pdev->dev);
467 if (!fbinfo) {
468 ret = -ENOMEM;
469 goto out2;
470 }
471
472 info = fbinfo->par;
473 info->fb = fbinfo;
474 info->dev = &pdev->dev;
475
476 platform_set_drvdata(pdev, fbinfo);
477
478 strcpy(fbinfo->fix.id, driver_name);
479
480 fbinfo->fix.type = FB_TYPE_PACKED_PIXELS;
481 fbinfo->fix.type_aux = 0;
482 fbinfo->fix.xpanstep = 0;
483 fbinfo->fix.ypanstep = 0;
484 fbinfo->fix.ywrapstep = 0;
485 fbinfo->fix.accel = FB_ACCEL_NONE;
486 fbinfo->fix.visual = FB_VISUAL_TRUECOLOR;
487
488 fbinfo->var.nonstd = 0;
489 fbinfo->var.activate = FB_ACTIVATE_NOW;
490 fbinfo->var.height = -1;
491 fbinfo->var.width = -1;
492 fbinfo->var.accel_flags = 0;
493 fbinfo->var.vmode = FB_VMODE_NONINTERLACED;
494
495 fbinfo->var.xres = LCD_X_RES;
496 fbinfo->var.xres_virtual = LCD_X_RES;
497 fbinfo->var.yres = LCD_Y_RES;
498 fbinfo->var.yres_virtual = LCD_Y_RES;
499 fbinfo->var.bits_per_pixel = LCD_BPP;
500
501 fbinfo->var.red.offset = 0;
502 fbinfo->var.green.offset = 8;
503 fbinfo->var.blue.offset = 16;
504 fbinfo->var.transp.offset = 0;
505 fbinfo->var.red.length = 8;
506 fbinfo->var.green.length = 8;
507 fbinfo->var.blue.length = 8;
508 fbinfo->var.transp.length = 0;
509 fbinfo->fix.smem_len = LCD_X_RES * LCD_Y_RES * LCD_BPP / 8;
510
511 fbinfo->fix.line_length = fbinfo->var.xres_virtual *
512 fbinfo->var.bits_per_pixel / 8;
513
514
515 fbinfo->fbops = &bfin_t350mcqb_fb_ops;
516 fbinfo->flags = FBINFO_FLAG_DEFAULT;
517
518 info->fb_buffer =
519 dma_alloc_coherent(NULL, fbinfo->fix.smem_len, &info->dma_handle,
520 GFP_KERNEL);
521
522 if (NULL == info->fb_buffer) {
523 printk(KERN_ERR DRIVER_NAME
524 ": couldn't allocate dma buffer.\n");
525 ret = -ENOMEM;
526 goto out3;
527 }
528
529 fbinfo->screen_base = (void *)info->fb_buffer + ACTIVE_VIDEO_MEM_OFFSET;
530 fbinfo->fix.smem_start = (int)info->fb_buffer + ACTIVE_VIDEO_MEM_OFFSET;
531
532 fbinfo->fbops = &bfin_t350mcqb_fb_ops;
533
534 fbinfo->pseudo_palette = &info->pseudo_pal;
535
536 if (fb_alloc_cmap(&fbinfo->cmap, BFIN_LCD_NBR_PALETTE_ENTRIES, 0)
537 < 0) {
538 printk(KERN_ERR DRIVER_NAME
539 "Fail to allocate colormap (%d entries)\n",
540 BFIN_LCD_NBR_PALETTE_ENTRIES);
541 ret = -EFAULT;
542 goto out4;
543 }
544
545 if (bfin_t350mcqb_request_ports(1)) {
546 printk(KERN_ERR DRIVER_NAME ": couldn't request gpio port.\n");
547 ret = -EFAULT;
548 goto out6;
549 }
550
551 info->irq = platform_get_irq(pdev, 0);
552 if (info->irq < 0) {
553 ret = -EINVAL;
554 goto out7;
555 }
556
557 ret = request_irq(info->irq, bfin_t350mcqb_irq_error, IRQF_DISABLED,
558 "PPI ERROR", info);
559 if (ret < 0) {
560 printk(KERN_ERR DRIVER_NAME
561 ": unable to request PPI ERROR IRQ\n");
562 goto out7;
563 }
564
565 if (register_framebuffer(fbinfo) < 0) {
566 printk(KERN_ERR DRIVER_NAME
567 ": unable to register framebuffer.\n");
568 ret = -EINVAL;
569 goto out8;
570 }
571#ifndef NO_BL_SUPPORT
572 bl_dev =
573 backlight_device_register("bf52x-bl", NULL, NULL,
574 &bfin_lq043fb_bl_ops);
575 bl_dev->props.max_brightness = 255;
576
577 lcd_dev = lcd_device_register(DRIVER_NAME, NULL, &bfin_lcd_ops);
578 lcd_dev->props.max_contrast = 255, printk(KERN_INFO "Done.\n");
579#endif
580
581 return 0;
582
583out8:
584 free_irq(info->irq, info);
585out7:
586 bfin_t350mcqb_request_ports(0);
587out6:
588 fb_dealloc_cmap(&fbinfo->cmap);
589out4:
590 dma_free_coherent(NULL, fbinfo->fix.smem_len, info->fb_buffer,
591 info->dma_handle);
592out3:
593 framebuffer_release(fbinfo);
594out2:
595 free_dma(CH_PPI);
596out1:
597 platform_set_drvdata(pdev, NULL);
598
599 return ret;
600}
601
602static int __devexit bfin_t350mcqb_remove(struct platform_device *pdev)
603{
604
605 struct fb_info *fbinfo = platform_get_drvdata(pdev);
606 struct bfin_t350mcqbfb_info *info = fbinfo->par;
607
608 unregister_framebuffer(fbinfo);
609
610 free_dma(CH_PPI);
611 free_irq(info->irq, info);
612
613 if (info->fb_buffer != NULL)
614 dma_free_coherent(NULL, fbinfo->fix.smem_len, info->fb_buffer,
615 info->dma_handle);
616
617 fb_dealloc_cmap(&fbinfo->cmap);
618
619#ifndef NO_BL_SUPPORT
620 lcd_device_unregister(lcd_dev);
621 backlight_device_unregister(bl_dev);
622#endif
623
624 bfin_t350mcqb_request_ports(0);
625
626 platform_set_drvdata(pdev, NULL);
627 framebuffer_release(fbinfo);
628
629 printk(KERN_INFO DRIVER_NAME ": Unregister LCD driver.\n");
630
631 return 0;
632}
633
634#ifdef CONFIG_PM
635static int bfin_t350mcqb_suspend(struct platform_device *pdev, pm_message_t state)
636{
637 bfin_t350mcqb_disable_ppi();
638 disable_dma(CH_PPI);
639 bfin_write_PPI_STATUS(0xFFFF);
640
641 return 0;
642}
643
644static int bfin_t350mcqb_resume(struct platform_device *pdev)
645{
646 enable_dma(CH_PPI);
647 bfin_t350mcqb_enable_ppi();
648
649 return 0;
650}
651#else
652#define bfin_t350mcqb_suspend NULL
653#define bfin_t350mcqb_resume NULL
654#endif
655
656static struct platform_driver bfin_t350mcqb_driver = {
657 .probe = bfin_t350mcqb_probe,
658 .remove = __devexit_p(bfin_t350mcqb_remove),
659 .suspend = bfin_t350mcqb_suspend,
660 .resume = bfin_t350mcqb_resume,
661 .driver = {
662 .name = DRIVER_NAME,
663 .owner = THIS_MODULE,
664 },
665};
666
667static int __init bfin_t350mcqb_driver_init(void)
668{
669 return platform_driver_register(&bfin_t350mcqb_driver);
670}
671
672static void __exit bfin_t350mcqb_driver_cleanup(void)
673{
674 platform_driver_unregister(&bfin_t350mcqb_driver);
675}
676
677MODULE_DESCRIPTION("Blackfin TFT LCD Driver");
678MODULE_LICENSE("GPL");
679
680module_init(bfin_t350mcqb_driver_init);
681module_exit(bfin_t350mcqb_driver_cleanup);
682
