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