1 /*
2 * SH7760/SH7763 LCDC Framebuffer driver.
3 *
4 * (c) 2006-2008 MSC Vertriebsges.m.b.H.,
5 * Manuel Lauss <mano@roarinelk.homelinux.net>
6 * (c) 2008 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
7 *
8 * This file is subject to the terms and conditions of the GNU General
9 * Public License. See the file COPYING in the main directory of this
10 * archive for more details.
11 *
12 * PLEASE HAVE A LOOK AT Documentation/fb/sh7760fb.txt!
13 *
14 * Thanks to Siegfried Schaefer <s.schaefer at schaefer-edv.de>
15 * for his original source and testing!
16 *
17 * sh7760_setcolreg get from drivers/video/sh_mobile_lcdcfb.c
18 */
19
20 #include <linux/completion.h>
21 #include <linux/delay.h>
22 #include <linux/dma-mapping.h>
23 #include <linux/fb.h>
24 #include <linux/interrupt.h>
25 #include <linux/io.h>
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28 #include <linux/platform_device.h>
29 #include <linux/slab.h>
30
31 #include <asm/sh7760fb.h>
32
33 struct sh7760fb_par {
34 void __iomem *base;
35 int irq;
36
37 struct sh7760fb_platdata *pd; /* display information */
38
39 dma_addr_t fbdma; /* physical address */
40
41 int rot; /* rotation enabled? */
42
43 u32 pseudo_palette[16];
44
45 struct platform_device *dev;
46 struct resource *ioarea;
47 struct completion vsync; /* vsync irq event */
48 };
49
sh7760fb_irq(int irq,void * data)50 static irqreturn_t sh7760fb_irq(int irq, void *data)
51 {
52 struct completion *c = data;
53
54 complete(c);
55
56 return IRQ_HANDLED;
57 }
58
59 /* wait_for_lps - wait until power supply has reached a certain state. */
wait_for_lps(struct sh7760fb_par * par,int val)60 static int wait_for_lps(struct sh7760fb_par *par, int val)
61 {
62 int i = 100;
63 while (--i && ((ioread16(par->base + LDPMMR) & 3) != val))
64 msleep(1);
65
66 if (i <= 0)
67 return -ETIMEDOUT;
68
69 return 0;
70 }
71
72 /* en/disable the LCDC */
sh7760fb_blank(int blank,struct fb_info * info)73 static int sh7760fb_blank(int blank, struct fb_info *info)
74 {
75 struct sh7760fb_par *par = info->par;
76 struct sh7760fb_platdata *pd = par->pd;
77 unsigned short cntr = ioread16(par->base + LDCNTR);
78 unsigned short intr = ioread16(par->base + LDINTR);
79 int lps;
80
81 if (blank == FB_BLANK_UNBLANK) {
82 intr |= VINT_START;
83 cntr = LDCNTR_DON2 | LDCNTR_DON;
84 lps = 3;
85 } else {
86 intr &= ~VINT_START;
87 cntr = LDCNTR_DON2;
88 lps = 0;
89 }
90
91 if (pd->blank)
92 pd->blank(blank);
93
94 iowrite16(intr, par->base + LDINTR);
95 iowrite16(cntr, par->base + LDCNTR);
96
97 return wait_for_lps(par, lps);
98 }
99
sh7760_setcolreg(u_int regno,u_int red,u_int green,u_int blue,u_int transp,struct fb_info * info)100 static int sh7760_setcolreg (u_int regno,
101 u_int red, u_int green, u_int blue,
102 u_int transp, struct fb_info *info)
103 {
104 u32 *palette = info->pseudo_palette;
105
106 if (regno >= 16)
107 return -EINVAL;
108
109 /* only FB_VISUAL_TRUECOLOR supported */
110
111 red >>= 16 - info->var.red.length;
112 green >>= 16 - info->var.green.length;
113 blue >>= 16 - info->var.blue.length;
114 transp >>= 16 - info->var.transp.length;
115
116 palette[regno] = (red << info->var.red.offset) |
117 (green << info->var.green.offset) |
118 (blue << info->var.blue.offset) |
119 (transp << info->var.transp.offset);
120
121 return 0;
122 }
123
sh7760fb_get_color_info(struct device * dev,u16 lddfr,int * bpp,int * gray)124 static int sh7760fb_get_color_info(struct device *dev,
125 u16 lddfr, int *bpp, int *gray)
126 {
127 int lbpp, lgray;
128
129 lgray = lbpp = 0;
130
131 switch (lddfr & LDDFR_COLOR_MASK) {
132 case LDDFR_1BPP_MONO:
133 lgray = 1;
134 lbpp = 1;
135 break;
136 case LDDFR_2BPP_MONO:
137 lgray = 1;
138 lbpp = 2;
139 break;
140 case LDDFR_4BPP_MONO:
141 lgray = 1;
142 case LDDFR_4BPP:
143 lbpp = 4;
144 break;
145 case LDDFR_6BPP_MONO:
146 lgray = 1;
147 case LDDFR_8BPP:
148 lbpp = 8;
149 break;
150 case LDDFR_16BPP_RGB555:
151 case LDDFR_16BPP_RGB565:
152 lbpp = 16;
153 lgray = 0;
154 break;
155 default:
156 dev_dbg(dev, "unsupported LDDFR bit depth.\n");
157 return -EINVAL;
158 }
159
160 if (bpp)
161 *bpp = lbpp;
162 if (gray)
163 *gray = lgray;
164
165 return 0;
166 }
167
sh7760fb_check_var(struct fb_var_screeninfo * var,struct fb_info * info)168 static int sh7760fb_check_var(struct fb_var_screeninfo *var,
169 struct fb_info *info)
170 {
171 struct fb_fix_screeninfo *fix = &info->fix;
172 struct sh7760fb_par *par = info->par;
173 int ret, bpp;
174
175 /* get color info from register value */
176 ret = sh7760fb_get_color_info(info->dev, par->pd->lddfr, &bpp, NULL);
177 if (ret)
178 return ret;
179
180 var->bits_per_pixel = bpp;
181
182 if ((var->grayscale) && (var->bits_per_pixel == 1))
183 fix->visual = FB_VISUAL_MONO10;
184 else if (var->bits_per_pixel >= 15)
185 fix->visual = FB_VISUAL_TRUECOLOR;
186 else
187 fix->visual = FB_VISUAL_PSEUDOCOLOR;
188
189 /* TODO: add some more validation here */
190 return 0;
191 }
192
193 /*
194 * sh7760fb_set_par - set videomode.
195 *
196 * NOTE: The rotation, grayscale and DSTN codepaths are
197 * totally untested!
198 */
sh7760fb_set_par(struct fb_info * info)199 static int sh7760fb_set_par(struct fb_info *info)
200 {
201 struct sh7760fb_par *par = info->par;
202 struct fb_videomode *vm = par->pd->def_mode;
203 unsigned long sbase, dstn_off, ldsarl, stride;
204 unsigned short hsynp, hsynw, htcn, hdcn;
205 unsigned short vsynp, vsynw, vtln, vdln;
206 unsigned short lddfr, ldmtr;
207 int ret, bpp, gray;
208
209 par->rot = par->pd->rotate;
210
211 /* rotate only works with xres <= 320 */
212 if (par->rot && (vm->xres > 320)) {
213 dev_dbg(info->dev, "rotation disabled due to display size\n");
214 par->rot = 0;
215 }
216
217 /* calculate LCDC reg vals from display parameters */
218 hsynp = vm->right_margin + vm->xres;
219 hsynw = vm->hsync_len;
220 htcn = vm->left_margin + hsynp + hsynw;
221 hdcn = vm->xres;
222 vsynp = vm->lower_margin + vm->yres;
223 vsynw = vm->vsync_len;
224 vtln = vm->upper_margin + vsynp + vsynw;
225 vdln = vm->yres;
226
227 /* get color info from register value */
228 ret = sh7760fb_get_color_info(info->dev, par->pd->lddfr, &bpp, &gray);
229 if (ret)
230 return ret;
231
232 dev_dbg(info->dev, "%dx%d %dbpp %s (orientation %s)\n", hdcn,
233 vdln, bpp, gray ? "grayscale" : "color",
234 par->rot ? "rotated" : "normal");
235
236 #ifdef CONFIG_CPU_LITTLE_ENDIAN
237 lddfr = par->pd->lddfr | (1 << 8);
238 #else
239 lddfr = par->pd->lddfr & ~(1 << 8);
240 #endif
241
242 ldmtr = par->pd->ldmtr;
243
244 if (!(vm->sync & FB_SYNC_HOR_HIGH_ACT))
245 ldmtr |= LDMTR_CL1POL;
246 if (!(vm->sync & FB_SYNC_VERT_HIGH_ACT))
247 ldmtr |= LDMTR_FLMPOL;
248
249 /* shut down LCDC before changing display parameters */
250 sh7760fb_blank(FB_BLANK_POWERDOWN, info);
251
252 iowrite16(par->pd->ldickr, par->base + LDICKR); /* pixclock */
253 iowrite16(ldmtr, par->base + LDMTR); /* polarities */
254 iowrite16(lddfr, par->base + LDDFR); /* color/depth */
255 iowrite16((par->rot ? 1 << 13 : 0), par->base + LDSMR); /* rotate */
256 iowrite16(par->pd->ldpmmr, par->base + LDPMMR); /* Power Management */
257 iowrite16(par->pd->ldpspr, par->base + LDPSPR); /* Power Supply Ctrl */
258
259 /* display resolution */
260 iowrite16(((htcn >> 3) - 1) | (((hdcn >> 3) - 1) << 8),
261 par->base + LDHCNR);
262 iowrite16(vdln - 1, par->base + LDVDLNR);
263 iowrite16(vtln - 1, par->base + LDVTLNR);
264 /* h/v sync signals */
265 iowrite16((vsynp - 1) | ((vsynw - 1) << 12), par->base + LDVSYNR);
266 iowrite16(((hsynp >> 3) - 1) | (((hsynw >> 3) - 1) << 12),
267 par->base + LDHSYNR);
268 /* AC modulation sig */
269 iowrite16(par->pd->ldaclnr, par->base + LDACLNR);
270
271 stride = (par->rot) ? vtln : hdcn;
272 if (!gray)
273 stride *= (bpp + 7) >> 3;
274 else {
275 if (bpp == 1)
276 stride >>= 3;
277 else if (bpp == 2)
278 stride >>= 2;
279 else if (bpp == 4)
280 stride >>= 1;
281 /* 6 bpp == 8 bpp */
282 }
283
284 /* if rotated, stride must be power of 2 */
285 if (par->rot) {
286 unsigned long bit = 1 << 31;
287 while (bit) {
288 if (stride & bit)
289 break;
290 bit >>= 1;
291 }
292 if (stride & ~bit)
293 stride = bit << 1; /* not P-o-2, round up */
294 }
295 iowrite16(stride, par->base + LDLAOR);
296
297 /* set display mem start address */
298 sbase = (unsigned long)par->fbdma;
299 if (par->rot)
300 sbase += (hdcn - 1) * stride;
301
302 iowrite32(sbase, par->base + LDSARU);
303
304 /*
305 * for DSTN need to set address for lower half.
306 * I (mlau) don't know which address to set it to,
307 * so I guessed at (stride * yres/2).
308 */
309 if (((ldmtr & 0x003f) >= LDMTR_DSTN_MONO_8) &&
310 ((ldmtr & 0x003f) <= LDMTR_DSTN_COLOR_16)) {
311
312 dev_dbg(info->dev, " ***** DSTN untested! *****\n");
313
314 dstn_off = stride;
315 if (par->rot)
316 dstn_off *= hdcn >> 1;
317 else
318 dstn_off *= vdln >> 1;
319
320 ldsarl = sbase + dstn_off;
321 } else
322 ldsarl = 0;
323
324 iowrite32(ldsarl, par->base + LDSARL); /* mem for lower half of DSTN */
325
326 info->fix.line_length = stride;
327
328 sh7760fb_check_var(&info->var, info);
329
330 sh7760fb_blank(FB_BLANK_UNBLANK, info); /* panel on! */
331
332 dev_dbg(info->dev, "hdcn : %6d htcn : %6d\n", hdcn, htcn);
333 dev_dbg(info->dev, "hsynw : %6d hsynp : %6d\n", hsynw, hsynp);
334 dev_dbg(info->dev, "vdln : %6d vtln : %6d\n", vdln, vtln);
335 dev_dbg(info->dev, "vsynw : %6d vsynp : %6d\n", vsynw, vsynp);
336 dev_dbg(info->dev, "clksrc: %6d clkdiv: %6d\n",
337 (par->pd->ldickr >> 12) & 3, par->pd->ldickr & 0x1f);
338 dev_dbg(info->dev, "ldpmmr: 0x%04x ldpspr: 0x%04x\n", par->pd->ldpmmr,
339 par->pd->ldpspr);
340 dev_dbg(info->dev, "ldmtr : 0x%04x lddfr : 0x%04x\n", ldmtr, lddfr);
341 dev_dbg(info->dev, "ldlaor: %ld\n", stride);
342 dev_dbg(info->dev, "ldsaru: 0x%08lx ldsarl: 0x%08lx\n", sbase, ldsarl);
343
344 return 0;
345 }
346
347 static struct fb_ops sh7760fb_ops = {
348 .owner = THIS_MODULE,
349 .fb_blank = sh7760fb_blank,
350 .fb_check_var = sh7760fb_check_var,
351 .fb_setcolreg = sh7760_setcolreg,
352 .fb_set_par = sh7760fb_set_par,
353 .fb_fillrect = cfb_fillrect,
354 .fb_copyarea = cfb_copyarea,
355 .fb_imageblit = cfb_imageblit,
356 };
357
sh7760fb_free_mem(struct fb_info * info)358 static void sh7760fb_free_mem(struct fb_info *info)
359 {
360 struct sh7760fb_par *par = info->par;
361
362 if (!info->screen_base)
363 return;
364
365 dma_free_coherent(info->dev, info->screen_size,
366 info->screen_base, par->fbdma);
367
368 par->fbdma = 0;
369 info->screen_base = NULL;
370 info->screen_size = 0;
371 }
372
373 /* allocate the framebuffer memory. This memory must be in Area3,
374 * (dictated by the DMA engine) and contiguous, at a 512 byte boundary.
375 */
sh7760fb_alloc_mem(struct fb_info * info)376 static int sh7760fb_alloc_mem(struct fb_info *info)
377 {
378 struct sh7760fb_par *par = info->par;
379 void *fbmem;
380 unsigned long vram;
381 int ret, bpp;
382
383 if (info->screen_base)
384 return 0;
385
386 /* get color info from register value */
387 ret = sh7760fb_get_color_info(info->dev, par->pd->lddfr, &bpp, NULL);
388 if (ret) {
389 printk(KERN_ERR "colinfo\n");
390 return ret;
391 }
392
393 /* min VRAM: xres_min = 16, yres_min = 1, bpp = 1: 2byte -> 1 page
394 max VRAM: xres_max = 1024, yres_max = 1024, bpp = 16: 2MB */
395
396 vram = info->var.xres * info->var.yres;
397 if (info->var.grayscale) {
398 if (bpp == 1)
399 vram >>= 3;
400 else if (bpp == 2)
401 vram >>= 2;
402 else if (bpp == 4)
403 vram >>= 1;
404 } else if (bpp > 8)
405 vram *= 2;
406 if ((vram < 1) || (vram > 1024 * 2048)) {
407 dev_dbg(info->dev, "too much VRAM required. Check settings\n");
408 return -ENODEV;
409 }
410
411 if (vram < PAGE_SIZE)
412 vram = PAGE_SIZE;
413
414 fbmem = dma_alloc_coherent(info->dev, vram, &par->fbdma, GFP_KERNEL);
415
416 if (!fbmem)
417 return -ENOMEM;
418
419 if ((par->fbdma & SH7760FB_DMA_MASK) != SH7760FB_DMA_MASK) {
420 sh7760fb_free_mem(info);
421 dev_err(info->dev, "kernel gave me memory at 0x%08lx, which is"
422 "unusable for the LCDC\n", (unsigned long)par->fbdma);
423 return -ENOMEM;
424 }
425
426 info->screen_base = fbmem;
427 info->screen_size = vram;
428 info->fix.smem_start = (unsigned long)info->screen_base;
429 info->fix.smem_len = info->screen_size;
430
431 return 0;
432 }
433
sh7760fb_probe(struct platform_device * pdev)434 static int __devinit sh7760fb_probe(struct platform_device *pdev)
435 {
436 struct fb_info *info;
437 struct resource *res;
438 struct sh7760fb_par *par;
439 int ret;
440
441 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
442 if (unlikely(res == NULL)) {
443 dev_err(&pdev->dev, "invalid resource\n");
444 return -EINVAL;
445 }
446
447 info = framebuffer_alloc(sizeof(struct sh7760fb_par), &pdev->dev);
448 if (!info)
449 return -ENOMEM;
450
451 par = info->par;
452 par->dev = pdev;
453
454 par->pd = pdev->dev.platform_data;
455 if (!par->pd) {
456 dev_dbg(info->dev, "no display setup data!\n");
457 ret = -ENODEV;
458 goto out_fb;
459 }
460
461 par->ioarea = request_mem_region(res->start,
462 resource_size(res), pdev->name);
463 if (!par->ioarea) {
464 dev_err(&pdev->dev, "mmio area busy\n");
465 ret = -EBUSY;
466 goto out_fb;
467 }
468
469 par->base = ioremap_nocache(res->start, resource_size(res));
470 if (!par->base) {
471 dev_err(&pdev->dev, "cannot remap\n");
472 ret = -ENODEV;
473 goto out_res;
474 }
475
476 iowrite16(0, par->base + LDINTR); /* disable vsync irq */
477 par->irq = platform_get_irq(pdev, 0);
478 if (par->irq >= 0) {
479 ret = request_irq(par->irq, sh7760fb_irq, 0,
480 "sh7760-lcdc", &par->vsync);
481 if (ret) {
482 dev_err(&pdev->dev, "cannot grab IRQ\n");
483 par->irq = -ENXIO;
484 } else
485 disable_irq_nosync(par->irq);
486 }
487
488 fb_videomode_to_var(&info->var, par->pd->def_mode);
489
490 ret = sh7760fb_alloc_mem(info);
491 if (ret) {
492 dev_dbg(info->dev, "framebuffer memory allocation failed!\n");
493 goto out_unmap;
494 }
495
496 info->pseudo_palette = par->pseudo_palette;
497
498 /* fixup color register bitpositions. These are fixed by hardware */
499 info->var.red.offset = 11;
500 info->var.red.length = 5;
501 info->var.red.msb_right = 0;
502
503 info->var.green.offset = 5;
504 info->var.green.length = 6;
505 info->var.green.msb_right = 0;
506
507 info->var.blue.offset = 0;
508 info->var.blue.length = 5;
509 info->var.blue.msb_right = 0;
510
511 info->var.transp.offset = 0;
512 info->var.transp.length = 0;
513 info->var.transp.msb_right = 0;
514
515 strcpy(info->fix.id, "sh7760-lcdc");
516
517 /* set the DON2 bit now, before cmap allocation, as it will randomize
518 * palette memory.
519 */
520 iowrite16(LDCNTR_DON2, par->base + LDCNTR);
521 info->fbops = &sh7760fb_ops;
522
523 ret = fb_alloc_cmap(&info->cmap, 256, 0);
524 if (ret) {
525 dev_dbg(info->dev, "Unable to allocate cmap memory\n");
526 goto out_mem;
527 }
528
529 ret = register_framebuffer(info);
530 if (ret < 0) {
531 dev_dbg(info->dev, "cannot register fb!\n");
532 goto out_cmap;
533 }
534 platform_set_drvdata(pdev, info);
535
536 printk(KERN_INFO "%s: memory at phys 0x%08lx-0x%08lx, size %ld KiB\n",
537 pdev->name,
538 (unsigned long)par->fbdma,
539 (unsigned long)(par->fbdma + info->screen_size - 1),
540 info->screen_size >> 10);
541
542 return 0;
543
544 out_cmap:
545 sh7760fb_blank(FB_BLANK_POWERDOWN, info);
546 fb_dealloc_cmap(&info->cmap);
547 out_mem:
548 sh7760fb_free_mem(info);
549 out_unmap:
550 if (par->irq >= 0)
551 free_irq(par->irq, &par->vsync);
552 iounmap(par->base);
553 out_res:
554 release_mem_region(res->start, resource_size(res));
555 out_fb:
556 framebuffer_release(info);
557 return ret;
558 }
559
sh7760fb_remove(struct platform_device * dev)560 static int __devexit sh7760fb_remove(struct platform_device *dev)
561 {
562 struct fb_info *info = platform_get_drvdata(dev);
563 struct sh7760fb_par *par = info->par;
564
565 sh7760fb_blank(FB_BLANK_POWERDOWN, info);
566 unregister_framebuffer(info);
567 fb_dealloc_cmap(&info->cmap);
568 sh7760fb_free_mem(info);
569 if (par->irq >= 0)
570 free_irq(par->irq, par);
571 iounmap(par->base);
572 release_mem_region(par->ioarea->start, resource_size(par->ioarea));
573 framebuffer_release(info);
574 platform_set_drvdata(dev, NULL);
575
576 return 0;
577 }
578
579 static struct platform_driver sh7760_lcdc_driver = {
580 .driver = {
581 .name = "sh7760-lcdc",
582 .owner = THIS_MODULE,
583 },
584 .probe = sh7760fb_probe,
585 .remove = __devexit_p(sh7760fb_remove),
586 };
587
588 module_platform_driver(sh7760_lcdc_driver);
589
590 MODULE_AUTHOR("Nobuhiro Iwamatsu, Manuel Lauss");
591 MODULE_DESCRIPTION("FBdev for SH7760/63 integrated LCD Controller");
592 MODULE_LICENSE("GPL");
593