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20#include <linux/platform_device.h>
21#include <linux/dma-mapping.h>
22#include <linux/slab.h>
23#include <linux/clk.h>
24#include <linux/fb.h>
25
26#include <mach/fb.h>
27
28
29#define EP93XXFB_VLINES_TOTAL 0x0000
30#define EP93XXFB_VSYNC 0x0004
31#define EP93XXFB_VACTIVE 0x0008
32#define EP93XXFB_VBLANK 0x0228
33#define EP93XXFB_VCLK 0x000c
34
35
36#define EP93XXFB_HCLKS_TOTAL 0x0010
37#define EP93XXFB_HSYNC 0x0014
38#define EP93XXFB_HACTIVE 0x0018
39#define EP93XXFB_HBLANK 0x022c
40#define EP93XXFB_HCLK 0x001c
41
42
43#define EP93XXFB_SCREEN_PAGE 0x0028
44#define EP93XXFB_SCREEN_HPAGE 0x002c
45#define EP93XXFB_SCREEN_LINES 0x0030
46#define EP93XXFB_LINE_LENGTH 0x0034
47#define EP93XXFB_VLINE_STEP 0x0038
48#define EP93XXFB_LINE_CARRY 0x003c
49#define EP93XXFB_EOL_OFFSET 0x0230
50
51
52#define EP93XXFB_BRIGHTNESS 0x0020
53#define EP93XXFB_ATTRIBS 0x0024
54#define EP93XXFB_SWLOCK 0x007c
55#define EP93XXFB_AC_RATE 0x0214
56#define EP93XXFB_FIFO_LEVEL 0x0234
57#define EP93XXFB_PIXELMODE 0x0054
58#define EP93XXFB_PIXELMODE_32BPP (0x7 << 0)
59#define EP93XXFB_PIXELMODE_24BPP (0x6 << 0)
60#define EP93XXFB_PIXELMODE_16BPP (0x4 << 0)
61#define EP93XXFB_PIXELMODE_8BPP (0x2 << 0)
62#define EP93XXFB_PIXELMODE_SHIFT_1P_24B (0x0 << 3)
63#define EP93XXFB_PIXELMODE_SHIFT_1P_18B (0x1 << 3)
64#define EP93XXFB_PIXELMODE_COLOR_LUT (0x0 << 10)
65#define EP93XXFB_PIXELMODE_COLOR_888 (0x4 << 10)
66#define EP93XXFB_PIXELMODE_COLOR_555 (0x5 << 10)
67#define EP93XXFB_PARL_IF_OUT 0x0058
68#define EP93XXFB_PARL_IF_IN 0x005c
69
70
71#define EP93XXFB_BLINK_RATE 0x0040
72#define EP93XXFB_BLINK_MASK 0x0044
73#define EP93XXFB_BLINK_PATTRN 0x0048
74#define EP93XXFB_PATTRN_MASK 0x004c
75#define EP93XXFB_BKGRND_OFFSET 0x0050
76
77
78#define EP93XXFB_CURSOR_ADR_START 0x0060
79#define EP93XXFB_CURSOR_ADR_RESET 0x0064
80#define EP93XXFB_CURSOR_SIZE 0x0068
81#define EP93XXFB_CURSOR_COLOR1 0x006c
82#define EP93XXFB_CURSOR_COLOR2 0x0070
83#define EP93XXFB_CURSOR_BLINK_COLOR1 0x021c
84#define EP93XXFB_CURSOR_BLINK_COLOR2 0x0220
85#define EP93XXFB_CURSOR_XY_LOC 0x0074
86#define EP93XXFB_CURSOR_DSCAN_HY_LOC 0x0078
87#define EP93XXFB_CURSOR_BLINK_RATE_CTRL 0x0224
88
89
90#define EP93XXFB_GRY_SCL_LUTR 0x0080
91#define EP93XXFB_GRY_SCL_LUTG 0x0280
92#define EP93XXFB_GRY_SCL_LUTB 0x0300
93#define EP93XXFB_LUT_SW_CONTROL 0x0218
94#define EP93XXFB_LUT_SW_CONTROL_SWTCH (1 << 0)
95#define EP93XXFB_LUT_SW_CONTROL_SSTAT (1 << 1)
96#define EP93XXFB_COLOR_LUT 0x0400
97
98
99#define EP93XXFB_VID_SIG_RSLT_VAL 0x0200
100#define EP93XXFB_VID_SIG_CTRL 0x0204
101#define EP93XXFB_VSIG 0x0208
102#define EP93XXFB_HSIG 0x020c
103#define EP93XXFB_SIG_CLR_STR 0x0210
104
105
106#define EP93XXFB_MIN_XRES 64
107#define EP93XXFB_MIN_YRES 64
108#define EP93XXFB_MAX_XRES 1024
109#define EP93XXFB_MAX_YRES 768
110
111struct ep93xx_fbi {
112 struct ep93xxfb_mach_info *mach_info;
113 struct clk *clk;
114 struct resource *res;
115 void __iomem *mmio_base;
116 unsigned int pseudo_palette[256];
117};
118
119static int check_screenpage_bug = 1;
120module_param(check_screenpage_bug, int, 0644);
121MODULE_PARM_DESC(check_screenpage_bug,
122 "Check for bit 27 screen page bug. Default = 1");
123
124static inline unsigned int ep93xxfb_readl(struct ep93xx_fbi *fbi,
125 unsigned int off)
126{
127 return __raw_readl(fbi->mmio_base + off);
128}
129
130static inline void ep93xxfb_writel(struct ep93xx_fbi *fbi,
131 unsigned int val, unsigned int off)
132{
133 __raw_writel(val, fbi->mmio_base + off);
134}
135
136
137
138
139static inline void ep93xxfb_out_locked(struct ep93xx_fbi *fbi,
140 unsigned int val, unsigned int reg)
141{
142
143
144
145
146 ep93xxfb_writel(fbi, 0xaa, EP93XXFB_SWLOCK);
147 ep93xxfb_writel(fbi, val, reg);
148}
149
150static void ep93xxfb_set_video_attribs(struct fb_info *info)
151{
152 struct ep93xx_fbi *fbi = info->par;
153 unsigned int attribs;
154
155 attribs = EP93XXFB_ENABLE;
156 attribs |= fbi->mach_info->flags;
157 ep93xxfb_out_locked(fbi, attribs, EP93XXFB_ATTRIBS);
158}
159
160static int ep93xxfb_set_pixelmode(struct fb_info *info)
161{
162 struct ep93xx_fbi *fbi = info->par;
163 unsigned int val;
164
165 info->var.transp.offset = 0;
166 info->var.transp.length = 0;
167
168 switch (info->var.bits_per_pixel) {
169 case 8:
170 val = EP93XXFB_PIXELMODE_8BPP | EP93XXFB_PIXELMODE_COLOR_LUT |
171 EP93XXFB_PIXELMODE_SHIFT_1P_18B;
172
173 info->var.red.offset = 0;
174 info->var.red.length = 8;
175 info->var.green.offset = 0;
176 info->var.green.length = 8;
177 info->var.blue.offset = 0;
178 info->var.blue.length = 8;
179 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
180 break;
181
182 case 16:
183 val = EP93XXFB_PIXELMODE_16BPP | EP93XXFB_PIXELMODE_COLOR_555 |
184 EP93XXFB_PIXELMODE_SHIFT_1P_18B;
185
186 info->var.red.offset = 11;
187 info->var.red.length = 5;
188 info->var.green.offset = 5;
189 info->var.green.length = 6;
190 info->var.blue.offset = 0;
191 info->var.blue.length = 5;
192 info->fix.visual = FB_VISUAL_TRUECOLOR;
193 break;
194
195 case 24:
196 val = EP93XXFB_PIXELMODE_24BPP | EP93XXFB_PIXELMODE_COLOR_888 |
197 EP93XXFB_PIXELMODE_SHIFT_1P_24B;
198
199 info->var.red.offset = 16;
200 info->var.red.length = 8;
201 info->var.green.offset = 8;
202 info->var.green.length = 8;
203 info->var.blue.offset = 0;
204 info->var.blue.length = 8;
205 info->fix.visual = FB_VISUAL_TRUECOLOR;
206 break;
207
208 case 32:
209 val = EP93XXFB_PIXELMODE_32BPP | EP93XXFB_PIXELMODE_COLOR_888 |
210 EP93XXFB_PIXELMODE_SHIFT_1P_24B;
211
212 info->var.red.offset = 16;
213 info->var.red.length = 8;
214 info->var.green.offset = 8;
215 info->var.green.length = 8;
216 info->var.blue.offset = 0;
217 info->var.blue.length = 8;
218 info->fix.visual = FB_VISUAL_TRUECOLOR;
219 break;
220
221 default:
222 return -EINVAL;
223 }
224
225 ep93xxfb_writel(fbi, val, EP93XXFB_PIXELMODE);
226 return 0;
227}
228
229static void ep93xxfb_set_timing(struct fb_info *info)
230{
231 struct ep93xx_fbi *fbi = info->par;
232 unsigned int vlines_total, hclks_total, start, stop;
233
234 vlines_total = info->var.yres + info->var.upper_margin +
235 info->var.lower_margin + info->var.vsync_len - 1;
236
237 hclks_total = info->var.xres + info->var.left_margin +
238 info->var.right_margin + info->var.hsync_len - 1;
239
240 ep93xxfb_out_locked(fbi, vlines_total, EP93XXFB_VLINES_TOTAL);
241 ep93xxfb_out_locked(fbi, hclks_total, EP93XXFB_HCLKS_TOTAL);
242
243 start = vlines_total;
244 stop = vlines_total - info->var.vsync_len;
245 ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VSYNC);
246
247 start = vlines_total - info->var.vsync_len - info->var.upper_margin;
248 stop = info->var.lower_margin - 1;
249 ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VBLANK);
250 ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VACTIVE);
251
252 start = vlines_total;
253 stop = vlines_total + 1;
254 ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VCLK);
255
256 start = hclks_total;
257 stop = hclks_total - info->var.hsync_len;
258 ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HSYNC);
259
260 start = hclks_total - info->var.hsync_len - info->var.left_margin;
261 stop = info->var.right_margin - 1;
262 ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HBLANK);
263 ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HACTIVE);
264
265 start = hclks_total;
266 stop = hclks_total;
267 ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HCLK);
268
269 ep93xxfb_out_locked(fbi, 0x0, EP93XXFB_LINE_CARRY);
270}
271
272static int ep93xxfb_set_par(struct fb_info *info)
273{
274 struct ep93xx_fbi *fbi = info->par;
275
276 clk_set_rate(fbi->clk, 1000 * PICOS2KHZ(info->var.pixclock));
277
278 ep93xxfb_set_timing(info);
279
280 info->fix.line_length = info->var.xres_virtual *
281 info->var.bits_per_pixel / 8;
282
283 ep93xxfb_writel(fbi, info->fix.smem_start, EP93XXFB_SCREEN_PAGE);
284 ep93xxfb_writel(fbi, info->var.yres - 1, EP93XXFB_SCREEN_LINES);
285 ep93xxfb_writel(fbi, ((info->var.xres * info->var.bits_per_pixel)
286 / 32) - 1, EP93XXFB_LINE_LENGTH);
287 ep93xxfb_writel(fbi, info->fix.line_length / 4, EP93XXFB_VLINE_STEP);
288 ep93xxfb_set_video_attribs(info);
289 return 0;
290}
291
292static int ep93xxfb_check_var(struct fb_var_screeninfo *var,
293 struct fb_info *info)
294{
295 int err;
296
297 err = ep93xxfb_set_pixelmode(info);
298 if (err)
299 return err;
300
301 var->xres = max_t(unsigned int, var->xres, EP93XXFB_MIN_XRES);
302 var->xres = min_t(unsigned int, var->xres, EP93XXFB_MAX_XRES);
303 var->xres_virtual = max(var->xres_virtual, var->xres);
304
305 var->yres = max_t(unsigned int, var->yres, EP93XXFB_MIN_YRES);
306 var->yres = min_t(unsigned int, var->yres, EP93XXFB_MAX_YRES);
307 var->yres_virtual = max(var->yres_virtual, var->yres);
308
309 return 0;
310}
311
312static int ep93xxfb_mmap(struct fb_info *info, struct vm_area_struct *vma)
313{
314 unsigned int offset = vma->vm_pgoff << PAGE_SHIFT;
315
316 if (offset < info->fix.smem_len) {
317 return dma_mmap_writecombine(info->dev, vma, info->screen_base,
318 info->fix.smem_start,
319 info->fix.smem_len);
320 }
321
322 return -EINVAL;
323}
324
325static int ep93xxfb_blank(int blank_mode, struct fb_info *info)
326{
327 struct ep93xx_fbi *fbi = info->par;
328 unsigned int attribs = ep93xxfb_readl(fbi, EP93XXFB_ATTRIBS);
329
330 if (blank_mode) {
331 if (fbi->mach_info->blank)
332 fbi->mach_info->blank(blank_mode, info);
333 ep93xxfb_out_locked(fbi, attribs & ~EP93XXFB_ENABLE,
334 EP93XXFB_ATTRIBS);
335 clk_disable(fbi->clk);
336 } else {
337 clk_enable(fbi->clk);
338 ep93xxfb_out_locked(fbi, attribs | EP93XXFB_ENABLE,
339 EP93XXFB_ATTRIBS);
340 if (fbi->mach_info->blank)
341 fbi->mach_info->blank(blank_mode, info);
342 }
343
344 return 0;
345}
346
347static inline int ep93xxfb_convert_color(int val, int width)
348{
349 return ((val << width) + 0x7fff - val) >> 16;
350}
351
352static int ep93xxfb_setcolreg(unsigned int regno, unsigned int red,
353 unsigned int green, unsigned int blue,
354 unsigned int transp, struct fb_info *info)
355{
356 struct ep93xx_fbi *fbi = info->par;
357 unsigned int *pal = info->pseudo_palette;
358 unsigned int ctrl, i, rgb, lut_current, lut_stat;
359
360 switch (info->fix.visual) {
361 case FB_VISUAL_PSEUDOCOLOR:
362 if (regno > 255)
363 return 1;
364 rgb = ((red & 0xff00) << 8) | (green & 0xff00) |
365 ((blue & 0xff00) >> 8);
366
367 pal[regno] = rgb;
368 ep93xxfb_writel(fbi, rgb, (EP93XXFB_COLOR_LUT + (regno << 2)));
369 ctrl = ep93xxfb_readl(fbi, EP93XXFB_LUT_SW_CONTROL);
370 lut_stat = !!(ctrl & EP93XXFB_LUT_SW_CONTROL_SSTAT);
371 lut_current = !!(ctrl & EP93XXFB_LUT_SW_CONTROL_SWTCH);
372
373 if (lut_stat == lut_current) {
374 for (i = 0; i < 256; i++) {
375 ep93xxfb_writel(fbi, pal[i],
376 EP93XXFB_COLOR_LUT + (i << 2));
377 }
378
379 ep93xxfb_writel(fbi,
380 ctrl ^ EP93XXFB_LUT_SW_CONTROL_SWTCH,
381 EP93XXFB_LUT_SW_CONTROL);
382 }
383 break;
384
385 case FB_VISUAL_TRUECOLOR:
386 if (regno > 16)
387 return 1;
388
389 red = ep93xxfb_convert_color(red, info->var.red.length);
390 green = ep93xxfb_convert_color(green, info->var.green.length);
391 blue = ep93xxfb_convert_color(blue, info->var.blue.length);
392 transp = ep93xxfb_convert_color(transp,
393 info->var.transp.length);
394
395 pal[regno] = (red << info->var.red.offset) |
396 (green << info->var.green.offset) |
397 (blue << info->var.blue.offset) |
398 (transp << info->var.transp.offset);
399 break;
400
401 default:
402 return 1;
403 }
404
405 return 0;
406}
407
408static struct fb_ops ep93xxfb_ops = {
409 .owner = THIS_MODULE,
410 .fb_check_var = ep93xxfb_check_var,
411 .fb_set_par = ep93xxfb_set_par,
412 .fb_blank = ep93xxfb_blank,
413 .fb_fillrect = cfb_fillrect,
414 .fb_copyarea = cfb_copyarea,
415 .fb_imageblit = cfb_imageblit,
416 .fb_setcolreg = ep93xxfb_setcolreg,
417 .fb_mmap = ep93xxfb_mmap,
418};
419
420static int __init ep93xxfb_calc_fbsize(struct ep93xxfb_mach_info *mach_info)
421{
422 int i, fb_size = 0;
423
424 if (mach_info->num_modes == EP93XXFB_USE_MODEDB) {
425 fb_size = EP93XXFB_MAX_XRES * EP93XXFB_MAX_YRES *
426 mach_info->bpp / 8;
427 } else {
428 for (i = 0; i < mach_info->num_modes; i++) {
429 const struct fb_videomode *mode;
430 int size;
431
432 mode = &mach_info->modes[i];
433 size = mode->xres * mode->yres * mach_info->bpp / 8;
434 if (size > fb_size)
435 fb_size = size;
436 }
437 }
438
439 return fb_size;
440}
441
442static int __init ep93xxfb_alloc_videomem(struct fb_info *info)
443{
444 struct ep93xx_fbi *fbi = info->par;
445 char __iomem *virt_addr;
446 dma_addr_t phys_addr;
447 unsigned int fb_size;
448
449 fb_size = ep93xxfb_calc_fbsize(fbi->mach_info);
450 virt_addr = dma_alloc_writecombine(info->dev, fb_size,
451 &phys_addr, GFP_KERNEL);
452 if (!virt_addr)
453 return -ENOMEM;
454
455
456
457
458
459
460
461
462
463 if (check_screenpage_bug && phys_addr & (1 << 27)) {
464 dev_err(info->dev, "ep93xx framebuffer bug. phys addr (0x%x) "
465 "has bit 27 set: cannot init framebuffer\n",
466 phys_addr);
467
468 dma_free_coherent(info->dev, fb_size, virt_addr, phys_addr);
469 return -ENOMEM;
470 }
471
472 info->fix.smem_start = phys_addr;
473 info->fix.smem_len = fb_size;
474 info->screen_base = virt_addr;
475
476 return 0;
477}
478
479static void ep93xxfb_dealloc_videomem(struct fb_info *info)
480{
481 if (info->screen_base)
482 dma_free_coherent(info->dev, info->fix.smem_len,
483 info->screen_base, info->fix.smem_start);
484}
485
486static int __init ep93xxfb_probe(struct platform_device *pdev)
487{
488 struct ep93xxfb_mach_info *mach_info = pdev->dev.platform_data;
489 struct fb_info *info;
490 struct ep93xx_fbi *fbi;
491 struct resource *res;
492 char *video_mode;
493 int err;
494
495 if (!mach_info)
496 return -EINVAL;
497
498 info = framebuffer_alloc(sizeof(struct ep93xx_fbi), &pdev->dev);
499 if (!info)
500 return -ENOMEM;
501
502 info->dev = &pdev->dev;
503 platform_set_drvdata(pdev, info);
504 fbi = info->par;
505 fbi->mach_info = mach_info;
506
507 err = fb_alloc_cmap(&info->cmap, 256, 0);
508 if (err)
509 goto failed;
510
511 err = ep93xxfb_alloc_videomem(info);
512 if (err)
513 goto failed;
514
515 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
516 if (!res) {
517 err = -ENXIO;
518 goto failed;
519 }
520
521 res = request_mem_region(res->start, resource_size(res), pdev->name);
522 if (!res) {
523 err = -EBUSY;
524 goto failed;
525 }
526
527 fbi->res = res;
528 fbi->mmio_base = ioremap(res->start, resource_size(res));
529 if (!fbi->mmio_base) {
530 err = -ENXIO;
531 goto failed;
532 }
533
534 strcpy(info->fix.id, pdev->name);
535 info->fbops = &ep93xxfb_ops;
536 info->fix.type = FB_TYPE_PACKED_PIXELS;
537 info->fix.accel = FB_ACCEL_NONE;
538 info->var.activate = FB_ACTIVATE_NOW;
539 info->var.vmode = FB_VMODE_NONINTERLACED;
540 info->flags = FBINFO_DEFAULT;
541 info->node = -1;
542 info->state = FBINFO_STATE_RUNNING;
543 info->pseudo_palette = &fbi->pseudo_palette;
544
545 fb_get_options("ep93xx-fb", &video_mode);
546 err = fb_find_mode(&info->var, info, video_mode,
547 fbi->mach_info->modes, fbi->mach_info->num_modes,
548 fbi->mach_info->default_mode, fbi->mach_info->bpp);
549 if (err == 0) {
550 dev_err(info->dev, "No suitable video mode found\n");
551 err = -EINVAL;
552 goto failed;
553 }
554
555 if (mach_info->setup) {
556 err = mach_info->setup(pdev);
557 if (err)
558 return err;
559 }
560
561 err = ep93xxfb_check_var(&info->var, info);
562 if (err)
563 goto failed;
564
565 fbi->clk = clk_get(info->dev, NULL);
566 if (IS_ERR(fbi->clk)) {
567 err = PTR_ERR(fbi->clk);
568 fbi->clk = NULL;
569 goto failed;
570 }
571
572 ep93xxfb_set_par(info);
573 clk_enable(fbi->clk);
574
575 err = register_framebuffer(info);
576 if (err)
577 goto failed;
578
579 dev_info(info->dev, "registered. Mode = %dx%d-%d\n",
580 info->var.xres, info->var.yres, info->var.bits_per_pixel);
581 return 0;
582
583failed:
584 if (fbi->clk)
585 clk_put(fbi->clk);
586 if (fbi->mmio_base)
587 iounmap(fbi->mmio_base);
588 if (fbi->res)
589 release_mem_region(fbi->res->start, resource_size(fbi->res));
590 ep93xxfb_dealloc_videomem(info);
591 if (&info->cmap)
592 fb_dealloc_cmap(&info->cmap);
593 if (fbi->mach_info->teardown)
594 fbi->mach_info->teardown(pdev);
595 kfree(info);
596 platform_set_drvdata(pdev, NULL);
597
598 return err;
599}
600
601static int ep93xxfb_remove(struct platform_device *pdev)
602{
603 struct fb_info *info = platform_get_drvdata(pdev);
604 struct ep93xx_fbi *fbi = info->par;
605
606 unregister_framebuffer(info);
607 clk_disable(fbi->clk);
608 clk_put(fbi->clk);
609 iounmap(fbi->mmio_base);
610 release_mem_region(fbi->res->start, resource_size(fbi->res));
611 ep93xxfb_dealloc_videomem(info);
612 fb_dealloc_cmap(&info->cmap);
613
614 if (fbi->mach_info->teardown)
615 fbi->mach_info->teardown(pdev);
616
617 kfree(info);
618 platform_set_drvdata(pdev, NULL);
619
620 return 0;
621}
622
623static struct platform_driver ep93xxfb_driver = {
624 .probe = ep93xxfb_probe,
625 .remove = ep93xxfb_remove,
626 .driver = {
627 .name = "ep93xx-fb",
628 .owner = THIS_MODULE,
629 },
630};
631
632static int __devinit ep93xxfb_init(void)
633{
634 return platform_driver_register(&ep93xxfb_driver);
635}
636
637static void __exit ep93xxfb_exit(void)
638{
639 platform_driver_unregister(&ep93xxfb_driver);
640}
641
642module_init(ep93xxfb_init);
643module_exit(ep93xxfb_exit);
644
645MODULE_DESCRIPTION("EP93XX Framebuffer Driver");
646MODULE_ALIAS("platform:ep93xx-fb");
647MODULE_AUTHOR("Ryan Mallon <ryan&bluewatersys.com>, "
648 "H Hartley Sweeten <hsweeten@visionengravers.com");
649MODULE_LICENSE("GPL");
650
