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20#include <linux/platform_device.h>
21#include <linux/module.h>
22#include <linux/dma-mapping.h>
23#include <linux/slab.h>
24#include <linux/clk.h>
25#include <linux/fb.h>
26#include <linux/io.h>
27
28#include <linux/platform_data/video-ep93xx.h>
29
30
31#define EP93XXFB_VLINES_TOTAL 0x0000
32#define EP93XXFB_VSYNC 0x0004
33#define EP93XXFB_VACTIVE 0x0008
34#define EP93XXFB_VBLANK 0x0228
35#define EP93XXFB_VCLK 0x000c
36
37
38#define EP93XXFB_HCLKS_TOTAL 0x0010
39#define EP93XXFB_HSYNC 0x0014
40#define EP93XXFB_HACTIVE 0x0018
41#define EP93XXFB_HBLANK 0x022c
42#define EP93XXFB_HCLK 0x001c
43
44
45#define EP93XXFB_SCREEN_PAGE 0x0028
46#define EP93XXFB_SCREEN_HPAGE 0x002c
47#define EP93XXFB_SCREEN_LINES 0x0030
48#define EP93XXFB_LINE_LENGTH 0x0034
49#define EP93XXFB_VLINE_STEP 0x0038
50#define EP93XXFB_LINE_CARRY 0x003c
51#define EP93XXFB_EOL_OFFSET 0x0230
52
53
54#define EP93XXFB_BRIGHTNESS 0x0020
55#define EP93XXFB_ATTRIBS 0x0024
56#define EP93XXFB_SWLOCK 0x007c
57#define EP93XXFB_AC_RATE 0x0214
58#define EP93XXFB_FIFO_LEVEL 0x0234
59#define EP93XXFB_PIXELMODE 0x0054
60#define EP93XXFB_PIXELMODE_32BPP (0x7 << 0)
61#define EP93XXFB_PIXELMODE_24BPP (0x6 << 0)
62#define EP93XXFB_PIXELMODE_16BPP (0x4 << 0)
63#define EP93XXFB_PIXELMODE_8BPP (0x2 << 0)
64#define EP93XXFB_PIXELMODE_SHIFT_1P_24B (0x0 << 3)
65#define EP93XXFB_PIXELMODE_SHIFT_1P_18B (0x1 << 3)
66#define EP93XXFB_PIXELMODE_COLOR_LUT (0x0 << 10)
67#define EP93XXFB_PIXELMODE_COLOR_888 (0x4 << 10)
68#define EP93XXFB_PIXELMODE_COLOR_555 (0x5 << 10)
69#define EP93XXFB_PARL_IF_OUT 0x0058
70#define EP93XXFB_PARL_IF_IN 0x005c
71
72
73#define EP93XXFB_BLINK_RATE 0x0040
74#define EP93XXFB_BLINK_MASK 0x0044
75#define EP93XXFB_BLINK_PATTRN 0x0048
76#define EP93XXFB_PATTRN_MASK 0x004c
77#define EP93XXFB_BKGRND_OFFSET 0x0050
78
79
80#define EP93XXFB_CURSOR_ADR_START 0x0060
81#define EP93XXFB_CURSOR_ADR_RESET 0x0064
82#define EP93XXFB_CURSOR_SIZE 0x0068
83#define EP93XXFB_CURSOR_COLOR1 0x006c
84#define EP93XXFB_CURSOR_COLOR2 0x0070
85#define EP93XXFB_CURSOR_BLINK_COLOR1 0x021c
86#define EP93XXFB_CURSOR_BLINK_COLOR2 0x0220
87#define EP93XXFB_CURSOR_XY_LOC 0x0074
88#define EP93XXFB_CURSOR_DSCAN_HY_LOC 0x0078
89#define EP93XXFB_CURSOR_BLINK_RATE_CTRL 0x0224
90
91
92#define EP93XXFB_GRY_SCL_LUTR 0x0080
93#define EP93XXFB_GRY_SCL_LUTG 0x0280
94#define EP93XXFB_GRY_SCL_LUTB 0x0300
95#define EP93XXFB_LUT_SW_CONTROL 0x0218
96#define EP93XXFB_LUT_SW_CONTROL_SWTCH (1 << 0)
97#define EP93XXFB_LUT_SW_CONTROL_SSTAT (1 << 1)
98#define EP93XXFB_COLOR_LUT 0x0400
99
100
101#define EP93XXFB_VID_SIG_RSLT_VAL 0x0200
102#define EP93XXFB_VID_SIG_CTRL 0x0204
103#define EP93XXFB_VSIG 0x0208
104#define EP93XXFB_HSIG 0x020c
105#define EP93XXFB_SIG_CLR_STR 0x0210
106
107
108#define EP93XXFB_MIN_XRES 64
109#define EP93XXFB_MIN_YRES 64
110#define EP93XXFB_MAX_XRES 1024
111#define EP93XXFB_MAX_YRES 768
112
113struct ep93xx_fbi {
114 struct ep93xxfb_mach_info *mach_info;
115 struct clk *clk;
116 struct resource *res;
117 void __iomem *mmio_base;
118 unsigned int pseudo_palette[256];
119};
120
121static int check_screenpage_bug = 1;
122module_param(check_screenpage_bug, int, 0644);
123MODULE_PARM_DESC(check_screenpage_bug,
124 "Check for bit 27 screen page bug. Default = 1");
125
126static inline unsigned int ep93xxfb_readl(struct ep93xx_fbi *fbi,
127 unsigned int off)
128{
129 return __raw_readl(fbi->mmio_base + off);
130}
131
132static inline void ep93xxfb_writel(struct ep93xx_fbi *fbi,
133 unsigned int val, unsigned int off)
134{
135 __raw_writel(val, fbi->mmio_base + off);
136}
137
138
139
140
141static inline void ep93xxfb_out_locked(struct ep93xx_fbi *fbi,
142 unsigned int val, unsigned int reg)
143{
144
145
146
147
148 ep93xxfb_writel(fbi, 0xaa, EP93XXFB_SWLOCK);
149 ep93xxfb_writel(fbi, val, reg);
150}
151
152static void ep93xxfb_set_video_attribs(struct fb_info *info)
153{
154 struct ep93xx_fbi *fbi = info->par;
155 unsigned int attribs;
156
157 attribs = EP93XXFB_ENABLE;
158 attribs |= fbi->mach_info->flags;
159 ep93xxfb_out_locked(fbi, attribs, EP93XXFB_ATTRIBS);
160}
161
162static int ep93xxfb_set_pixelmode(struct fb_info *info)
163{
164 struct ep93xx_fbi *fbi = info->par;
165 unsigned int val;
166
167 info->var.transp.offset = 0;
168 info->var.transp.length = 0;
169
170 switch (info->var.bits_per_pixel) {
171 case 8:
172 val = EP93XXFB_PIXELMODE_8BPP | EP93XXFB_PIXELMODE_COLOR_LUT |
173 EP93XXFB_PIXELMODE_SHIFT_1P_18B;
174
175 info->var.red.offset = 0;
176 info->var.red.length = 8;
177 info->var.green.offset = 0;
178 info->var.green.length = 8;
179 info->var.blue.offset = 0;
180 info->var.blue.length = 8;
181 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
182 break;
183
184 case 16:
185 val = EP93XXFB_PIXELMODE_16BPP | EP93XXFB_PIXELMODE_COLOR_555 |
186 EP93XXFB_PIXELMODE_SHIFT_1P_18B;
187
188 info->var.red.offset = 11;
189 info->var.red.length = 5;
190 info->var.green.offset = 5;
191 info->var.green.length = 6;
192 info->var.blue.offset = 0;
193 info->var.blue.length = 5;
194 info->fix.visual = FB_VISUAL_TRUECOLOR;
195 break;
196
197 case 24:
198 val = EP93XXFB_PIXELMODE_24BPP | EP93XXFB_PIXELMODE_COLOR_888 |
199 EP93XXFB_PIXELMODE_SHIFT_1P_24B;
200
201 info->var.red.offset = 16;
202 info->var.red.length = 8;
203 info->var.green.offset = 8;
204 info->var.green.length = 8;
205 info->var.blue.offset = 0;
206 info->var.blue.length = 8;
207 info->fix.visual = FB_VISUAL_TRUECOLOR;
208 break;
209
210 case 32:
211 val = EP93XXFB_PIXELMODE_32BPP | EP93XXFB_PIXELMODE_COLOR_888 |
212 EP93XXFB_PIXELMODE_SHIFT_1P_24B;
213
214 info->var.red.offset = 16;
215 info->var.red.length = 8;
216 info->var.green.offset = 8;
217 info->var.green.length = 8;
218 info->var.blue.offset = 0;
219 info->var.blue.length = 8;
220 info->fix.visual = FB_VISUAL_TRUECOLOR;
221 break;
222
223 default:
224 return -EINVAL;
225 }
226
227 ep93xxfb_writel(fbi, val, EP93XXFB_PIXELMODE);
228 return 0;
229}
230
231static void ep93xxfb_set_timing(struct fb_info *info)
232{
233 struct ep93xx_fbi *fbi = info->par;
234 unsigned int vlines_total, hclks_total, start, stop;
235
236 vlines_total = info->var.yres + info->var.upper_margin +
237 info->var.lower_margin + info->var.vsync_len - 1;
238
239 hclks_total = info->var.xres + info->var.left_margin +
240 info->var.right_margin + info->var.hsync_len - 1;
241
242 ep93xxfb_out_locked(fbi, vlines_total, EP93XXFB_VLINES_TOTAL);
243 ep93xxfb_out_locked(fbi, hclks_total, EP93XXFB_HCLKS_TOTAL);
244
245 start = vlines_total;
246 stop = vlines_total - info->var.vsync_len;
247 ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VSYNC);
248
249 start = vlines_total - info->var.vsync_len - info->var.upper_margin;
250 stop = info->var.lower_margin - 1;
251 ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VBLANK);
252 ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VACTIVE);
253
254 start = vlines_total;
255 stop = vlines_total + 1;
256 ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VCLK);
257
258 start = hclks_total;
259 stop = hclks_total - info->var.hsync_len;
260 ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HSYNC);
261
262 start = hclks_total - info->var.hsync_len - info->var.left_margin;
263 stop = info->var.right_margin - 1;
264 ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HBLANK);
265 ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HACTIVE);
266
267 start = hclks_total;
268 stop = hclks_total;
269 ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HCLK);
270
271 ep93xxfb_out_locked(fbi, 0x0, EP93XXFB_LINE_CARRY);
272}
273
274static int ep93xxfb_set_par(struct fb_info *info)
275{
276 struct ep93xx_fbi *fbi = info->par;
277
278 clk_set_rate(fbi->clk, 1000 * PICOS2KHZ(info->var.pixclock));
279
280 ep93xxfb_set_timing(info);
281
282 info->fix.line_length = info->var.xres_virtual *
283 info->var.bits_per_pixel / 8;
284
285 ep93xxfb_writel(fbi, info->fix.smem_start, EP93XXFB_SCREEN_PAGE);
286 ep93xxfb_writel(fbi, info->var.yres - 1, EP93XXFB_SCREEN_LINES);
287 ep93xxfb_writel(fbi, ((info->var.xres * info->var.bits_per_pixel)
288 / 32) - 1, EP93XXFB_LINE_LENGTH);
289 ep93xxfb_writel(fbi, info->fix.line_length / 4, EP93XXFB_VLINE_STEP);
290 ep93xxfb_set_video_attribs(info);
291 return 0;
292}
293
294static int ep93xxfb_check_var(struct fb_var_screeninfo *var,
295 struct fb_info *info)
296{
297 int err;
298
299 err = ep93xxfb_set_pixelmode(info);
300 if (err)
301 return err;
302
303 var->xres = max_t(unsigned int, var->xres, EP93XXFB_MIN_XRES);
304 var->xres = min_t(unsigned int, var->xres, EP93XXFB_MAX_XRES);
305 var->xres_virtual = max(var->xres_virtual, var->xres);
306
307 var->yres = max_t(unsigned int, var->yres, EP93XXFB_MIN_YRES);
308 var->yres = min_t(unsigned int, var->yres, EP93XXFB_MAX_YRES);
309 var->yres_virtual = max(var->yres_virtual, var->yres);
310
311 return 0;
312}
313
314static int ep93xxfb_mmap(struct fb_info *info, struct vm_area_struct *vma)
315{
316 unsigned int offset = vma->vm_pgoff << PAGE_SHIFT;
317
318 if (offset < info->fix.smem_len) {
319 return dma_mmap_writecombine(info->dev, vma, info->screen_base,
320 info->fix.smem_start,
321 info->fix.smem_len);
322 }
323
324 return -EINVAL;
325}
326
327static int ep93xxfb_blank(int blank_mode, struct fb_info *info)
328{
329 struct ep93xx_fbi *fbi = info->par;
330 unsigned int attribs = ep93xxfb_readl(fbi, EP93XXFB_ATTRIBS);
331
332 if (blank_mode) {
333 if (fbi->mach_info->blank)
334 fbi->mach_info->blank(blank_mode, info);
335 ep93xxfb_out_locked(fbi, attribs & ~EP93XXFB_ENABLE,
336 EP93XXFB_ATTRIBS);
337 clk_disable(fbi->clk);
338 } else {
339 clk_enable(fbi->clk);
340 ep93xxfb_out_locked(fbi, attribs | EP93XXFB_ENABLE,
341 EP93XXFB_ATTRIBS);
342 if (fbi->mach_info->blank)
343 fbi->mach_info->blank(blank_mode, info);
344 }
345
346 return 0;
347}
348
349static inline int ep93xxfb_convert_color(int val, int width)
350{
351 return ((val << width) + 0x7fff - val) >> 16;
352}
353
354static int ep93xxfb_setcolreg(unsigned int regno, unsigned int red,
355 unsigned int green, unsigned int blue,
356 unsigned int transp, struct fb_info *info)
357{
358 struct ep93xx_fbi *fbi = info->par;
359 unsigned int *pal = info->pseudo_palette;
360 unsigned int ctrl, i, rgb, lut_current, lut_stat;
361
362 switch (info->fix.visual) {
363 case FB_VISUAL_PSEUDOCOLOR:
364 if (regno > 255)
365 return 1;
366 rgb = ((red & 0xff00) << 8) | (green & 0xff00) |
367 ((blue & 0xff00) >> 8);
368
369 pal[regno] = rgb;
370 ep93xxfb_writel(fbi, rgb, (EP93XXFB_COLOR_LUT + (regno << 2)));
371 ctrl = ep93xxfb_readl(fbi, EP93XXFB_LUT_SW_CONTROL);
372 lut_stat = !!(ctrl & EP93XXFB_LUT_SW_CONTROL_SSTAT);
373 lut_current = !!(ctrl & EP93XXFB_LUT_SW_CONTROL_SWTCH);
374
375 if (lut_stat == lut_current) {
376 for (i = 0; i < 256; i++) {
377 ep93xxfb_writel(fbi, pal[i],
378 EP93XXFB_COLOR_LUT + (i << 2));
379 }
380
381 ep93xxfb_writel(fbi,
382 ctrl ^ EP93XXFB_LUT_SW_CONTROL_SWTCH,
383 EP93XXFB_LUT_SW_CONTROL);
384 }
385 break;
386
387 case FB_VISUAL_TRUECOLOR:
388 if (regno > 16)
389 return 1;
390
391 red = ep93xxfb_convert_color(red, info->var.red.length);
392 green = ep93xxfb_convert_color(green, info->var.green.length);
393 blue = ep93xxfb_convert_color(blue, info->var.blue.length);
394 transp = ep93xxfb_convert_color(transp,
395 info->var.transp.length);
396
397 pal[regno] = (red << info->var.red.offset) |
398 (green << info->var.green.offset) |
399 (blue << info->var.blue.offset) |
400 (transp << info->var.transp.offset);
401 break;
402
403 default:
404 return 1;
405 }
406
407 return 0;
408}
409
410static struct fb_ops ep93xxfb_ops = {
411 .owner = THIS_MODULE,
412 .fb_check_var = ep93xxfb_check_var,
413 .fb_set_par = ep93xxfb_set_par,
414 .fb_blank = ep93xxfb_blank,
415 .fb_fillrect = cfb_fillrect,
416 .fb_copyarea = cfb_copyarea,
417 .fb_imageblit = cfb_imageblit,
418 .fb_setcolreg = ep93xxfb_setcolreg,
419 .fb_mmap = ep93xxfb_mmap,
420};
421
422static int ep93xxfb_alloc_videomem(struct fb_info *info)
423{
424 char __iomem *virt_addr;
425 dma_addr_t phys_addr;
426 unsigned int fb_size;
427
428
429 fb_size = EP93XXFB_MAX_XRES * EP93XXFB_MAX_YRES * 2;
430
431 virt_addr = dma_alloc_writecombine(info->dev, fb_size,
432 &phys_addr, GFP_KERNEL);
433 if (!virt_addr)
434 return -ENOMEM;
435
436
437
438
439
440
441
442
443
444 if (check_screenpage_bug && phys_addr & (1 << 27)) {
445 dev_err(info->dev, "ep93xx framebuffer bug. phys addr (0x%x) "
446 "has bit 27 set: cannot init framebuffer\n",
447 phys_addr);
448
449 dma_free_coherent(info->dev, fb_size, virt_addr, phys_addr);
450 return -ENOMEM;
451 }
452
453 info->fix.smem_start = phys_addr;
454 info->fix.smem_len = fb_size;
455 info->screen_base = virt_addr;
456
457 return 0;
458}
459
460static void ep93xxfb_dealloc_videomem(struct fb_info *info)
461{
462 if (info->screen_base)
463 dma_free_coherent(info->dev, info->fix.smem_len,
464 info->screen_base, info->fix.smem_start);
465}
466
467static int ep93xxfb_probe(struct platform_device *pdev)
468{
469 struct ep93xxfb_mach_info *mach_info = dev_get_platdata(&pdev->dev);
470 struct fb_info *info;
471 struct ep93xx_fbi *fbi;
472 struct resource *res;
473 char *video_mode;
474 int err;
475
476 if (!mach_info)
477 return -EINVAL;
478
479 info = framebuffer_alloc(sizeof(struct ep93xx_fbi), &pdev->dev);
480 if (!info)
481 return -ENOMEM;
482
483 info->dev = &pdev->dev;
484 platform_set_drvdata(pdev, info);
485 fbi = info->par;
486 fbi->mach_info = mach_info;
487
488 err = fb_alloc_cmap(&info->cmap, 256, 0);
489 if (err)
490 goto failed_cmap;
491
492 err = ep93xxfb_alloc_videomem(info);
493 if (err)
494 goto failed_videomem;
495
496 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
497 if (!res) {
498 err = -ENXIO;
499 goto failed_resource;
500 }
501
502
503
504
505
506
507
508
509
510
511 fbi->res = res;
512 fbi->mmio_base = devm_ioremap(&pdev->dev, res->start,
513 resource_size(res));
514 if (!fbi->mmio_base) {
515 err = -ENXIO;
516 goto failed_resource;
517 }
518
519 strcpy(info->fix.id, pdev->name);
520 info->fbops = &ep93xxfb_ops;
521 info->fix.type = FB_TYPE_PACKED_PIXELS;
522 info->fix.accel = FB_ACCEL_NONE;
523 info->var.activate = FB_ACTIVATE_NOW;
524 info->var.vmode = FB_VMODE_NONINTERLACED;
525 info->flags = FBINFO_DEFAULT;
526 info->node = -1;
527 info->state = FBINFO_STATE_RUNNING;
528 info->pseudo_palette = &fbi->pseudo_palette;
529
530 fb_get_options("ep93xx-fb", &video_mode);
531 err = fb_find_mode(&info->var, info, video_mode,
532 NULL, 0, NULL, 16);
533 if (err == 0) {
534 dev_err(info->dev, "No suitable video mode found\n");
535 err = -EINVAL;
536 goto failed_resource;
537 }
538
539 if (mach_info->setup) {
540 err = mach_info->setup(pdev);
541 if (err)
542 goto failed_resource;
543 }
544
545 err = ep93xxfb_check_var(&info->var, info);
546 if (err)
547 goto failed_check;
548
549 fbi->clk = devm_clk_get(&pdev->dev, NULL);
550 if (IS_ERR(fbi->clk)) {
551 err = PTR_ERR(fbi->clk);
552 fbi->clk = NULL;
553 goto failed_check;
554 }
555
556 ep93xxfb_set_par(info);
557 clk_enable(fbi->clk);
558
559 err = register_framebuffer(info);
560 if (err)
561 goto failed_check;
562
563 dev_info(info->dev, "registered. Mode = %dx%d-%d\n",
564 info->var.xres, info->var.yres, info->var.bits_per_pixel);
565 return 0;
566
567failed_check:
568 if (fbi->mach_info->teardown)
569 fbi->mach_info->teardown(pdev);
570failed_resource:
571 ep93xxfb_dealloc_videomem(info);
572failed_videomem:
573 fb_dealloc_cmap(&info->cmap);
574failed_cmap:
575 kfree(info);
576
577 return err;
578}
579
580static int ep93xxfb_remove(struct platform_device *pdev)
581{
582 struct fb_info *info = platform_get_drvdata(pdev);
583 struct ep93xx_fbi *fbi = info->par;
584
585 unregister_framebuffer(info);
586 clk_disable(fbi->clk);
587 ep93xxfb_dealloc_videomem(info);
588 fb_dealloc_cmap(&info->cmap);
589
590 if (fbi->mach_info->teardown)
591 fbi->mach_info->teardown(pdev);
592
593 kfree(info);
594
595 return 0;
596}
597
598static struct platform_driver ep93xxfb_driver = {
599 .probe = ep93xxfb_probe,
600 .remove = ep93xxfb_remove,
601 .driver = {
602 .name = "ep93xx-fb",
603 },
604};
605module_platform_driver(ep93xxfb_driver);
606
607MODULE_DESCRIPTION("EP93XX Framebuffer Driver");
608MODULE_ALIAS("platform:ep93xx-fb");
609MODULE_AUTHOR("Ryan Mallon, "
610 "H Hartley Sweeten <hsweeten@visionengravers.com");
611MODULE_LICENSE("GPL");
612
