2 * SH7760/SH7763 LCDC Framebuffer driver.
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>
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.
12 * PLEASE HAVE A LOOK AT Documentation/fb/sh7760fb.txt!
14 * Thanks to Siegfried Schaefer <s.schaefer at schaefer-edv.de>
15 * for his original source and testing!
18 #include <linux/completion.h>
19 #include <linux/delay.h>
20 #include <linux/dma-mapping.h>
22 #include <linux/interrupt.h>
24 #include <linux/kernel.h>
25 #include <linux/module.h>
26 #include <linux/platform_device.h>
28 #include <asm/sh7760fb.h>
34 struct sh7760fb_platdata *pd; /* display information */
36 dma_addr_t fbdma; /* physical address */
38 int rot; /* rotation enabled? */
40 u32 pseudo_palette[16];
42 struct platform_device *dev;
43 struct resource *ioarea;
44 struct completion vsync; /* vsync irq event */
47 static irqreturn_t sh7760fb_irq(int irq, void *data)
49 struct completion *c = data;
56 static void sh7760fb_wait_vsync(struct fb_info *info)
58 struct sh7760fb_par *par = info->par;
63 iowrite16(ioread16(par->base + LDINTR) & ~VINT_CHECK,
67 /* poll for vert. retrace: status bit is sticky */
68 while (!(ioread16(par->base + LDINTR) & VINT_CHECK))
71 /* a "wait_for_irq_event(par->irq)" would be extremely nice */
72 init_completion(&par->vsync);
74 wait_for_completion(&par->vsync);
75 disable_irq_nosync(par->irq);
79 /* wait_for_lps - wait until power supply has reached a certain state. */
80 static int wait_for_lps(struct sh7760fb_par *par, int val)
83 while (--i && ((ioread16(par->base + LDPMMR) & 3) != val))
92 /* en/disable the LCDC */
93 static int sh7760fb_blank(int blank, struct fb_info *info)
95 struct sh7760fb_par *par = info->par;
96 struct sh7760fb_platdata *pd = par->pd;
97 unsigned short cntr = ioread16(par->base + LDCNTR);
98 unsigned short intr = ioread16(par->base + LDINTR);
101 if (blank == FB_BLANK_UNBLANK) {
103 cntr = LDCNTR_DON2 | LDCNTR_DON;
114 iowrite16(intr, par->base + LDINTR);
115 iowrite16(cntr, par->base + LDCNTR);
117 return wait_for_lps(par, lps);
120 /* set color registers */
121 static int sh7760fb_setcmap(struct fb_cmap *cmap, struct fb_info *info)
123 struct sh7760fb_par *par = info->par;
127 u16 *g = cmap->green;
134 sh7760fb_wait_vsync(info);
136 /* request palette access */
137 iowrite16(LDPALCR_PALEN, par->base + LDPALCR);
139 /* poll for access grant */
141 while (!(ioread16(par->base + LDPALCR) & LDPALCR_PALS) && (--tmo))
146 dev_dbg(info->dev, "no palette access!\n");
150 while (l && (s < 256)) {
151 col = ((*r) & 0xff) << 16;
152 col |= ((*g) & 0xff) << 8;
153 col |= ((*b) & 0xff);
154 col &= SH7760FB_PALETTE_MASK;
155 iowrite32(col, par->base + LDPR(s));
158 ((u32 *) (info->pseudo_palette))[s] = s;
167 iowrite16(0, par->base + LDPALCR);
171 static void encode_fix(struct fb_fix_screeninfo *fix, struct fb_info *info,
172 unsigned long stride)
174 memset(fix, 0, sizeof(struct fb_fix_screeninfo));
175 strcpy(fix->id, "sh7760-lcdc");
177 fix->smem_start = (unsigned long)info->screen_base;
178 fix->smem_len = info->screen_size;
180 fix->line_length = stride;
183 static int sh7760fb_get_color_info(struct device *dev,
184 u16 lddfr, int *bpp, int *gray)
190 switch (lddfr & LDDFR_COLOR_MASK) {
191 case LDDFR_1BPP_MONO:
195 case LDDFR_2BPP_MONO:
199 case LDDFR_4BPP_MONO:
204 case LDDFR_6BPP_MONO:
209 case LDDFR_16BPP_RGB555:
210 case LDDFR_16BPP_RGB565:
215 dev_dbg(dev, "unsupported LDDFR bit depth.\n");
227 static int sh7760fb_check_var(struct fb_var_screeninfo *var,
228 struct fb_info *info)
230 struct fb_fix_screeninfo *fix = &info->fix;
231 struct sh7760fb_par *par = info->par;
234 /* get color info from register value */
235 ret = sh7760fb_get_color_info(info->dev, par->pd->lddfr, &bpp, NULL);
239 var->bits_per_pixel = bpp;
241 if ((var->grayscale) && (var->bits_per_pixel == 1))
242 fix->visual = FB_VISUAL_MONO10;
243 else if (var->bits_per_pixel >= 15)
244 fix->visual = FB_VISUAL_TRUECOLOR;
246 fix->visual = FB_VISUAL_PSEUDOCOLOR;
248 /* TODO: add some more validation here */
253 * sh7760fb_set_par - set videomode.
255 * NOTE: The rotation, grayscale and DSTN codepaths are
258 static int sh7760fb_set_par(struct fb_info *info)
260 struct sh7760fb_par *par = info->par;
261 struct fb_videomode *vm = par->pd->def_mode;
262 unsigned long sbase, dstn_off, ldsarl, stride;
263 unsigned short hsynp, hsynw, htcn, hdcn;
264 unsigned short vsynp, vsynw, vtln, vdln;
265 unsigned short lddfr, ldmtr;
268 par->rot = par->pd->rotate;
270 /* rotate only works with xres <= 320 */
271 if (par->rot && (vm->xres > 320)) {
272 dev_dbg(info->dev, "rotation disabled due to display size\n");
276 /* calculate LCDC reg vals from display parameters */
277 hsynp = vm->right_margin + vm->xres;
278 hsynw = vm->hsync_len;
279 htcn = vm->left_margin + hsynp + hsynw;
281 vsynp = vm->lower_margin + vm->yres;
282 vsynw = vm->vsync_len;
283 vtln = vm->upper_margin + vsynp + vsynw;
286 /* get color info from register value */
287 ret = sh7760fb_get_color_info(info->dev, par->pd->lddfr, &bpp, &gray);
291 dev_dbg(info->dev, "%dx%d %dbpp %s (orientation %s)\n", hdcn,
292 vdln, bpp, gray ? "grayscale" : "color",
293 par->rot ? "rotated" : "normal");
295 #ifdef CONFIG_CPU_LITTLE_ENDIAN
296 lddfr = par->pd->lddfr | (1 << 8);
298 lddfr = par->pd->lddfr & ~(1 << 8);
301 ldmtr = par->pd->ldmtr;
303 if (!(vm->sync & FB_SYNC_HOR_HIGH_ACT))
304 ldmtr |= LDMTR_CL1POL;
305 if (!(vm->sync & FB_SYNC_VERT_HIGH_ACT))
306 ldmtr |= LDMTR_FLMPOL;
308 /* shut down LCDC before changing display parameters */
309 sh7760fb_blank(FB_BLANK_POWERDOWN, info);
311 iowrite16(par->pd->ldickr, par->base + LDICKR); /* pixclock */
312 iowrite16(ldmtr, par->base + LDMTR); /* polarities */
313 iowrite16(lddfr, par->base + LDDFR); /* color/depth */
314 iowrite16((par->rot ? 1 << 13 : 0), par->base + LDSMR); /* rotate */
315 iowrite16(par->pd->ldpmmr, par->base + LDPMMR); /* Power Management */
316 iowrite16(par->pd->ldpspr, par->base + LDPSPR); /* Power Supply Ctrl */
318 /* display resolution */
319 iowrite16(((htcn >> 3) - 1) | (((hdcn >> 3) - 1) << 8),
321 iowrite16(vdln - 1, par->base + LDVDLNR);
322 iowrite16(vtln - 1, par->base + LDVTLNR);
323 /* h/v sync signals */
324 iowrite16((vsynp - 1) | ((vsynw - 1) << 12), par->base + LDVSYNR);
325 iowrite16(((hsynp >> 3) - 1) | (((hsynw >> 3) - 1) << 12),
326 par->base + LDHSYNR);
327 /* AC modulation sig */
328 iowrite16(par->pd->ldaclnr, par->base + LDACLNR);
330 stride = (par->rot) ? vtln : hdcn;
332 stride *= (bpp + 7) >> 3;
343 /* if rotated, stride must be power of 2 */
345 unsigned long bit = 1 << 31;
352 stride = bit << 1; /* not P-o-2, round up */
354 iowrite16(stride, par->base + LDLAOR);
356 /* set display mem start address */
357 sbase = (unsigned long)par->fbdma;
359 sbase += (hdcn - 1) * stride;
361 iowrite32(sbase, par->base + LDSARU);
364 * for DSTN need to set address for lower half.
365 * I (mlau) don't know which address to set it to,
366 * so I guessed at (stride * yres/2).
368 if (((ldmtr & 0x003f) >= LDMTR_DSTN_MONO_8) &&
369 ((ldmtr & 0x003f) <= LDMTR_DSTN_COLOR_16)) {
371 dev_dbg(info->dev, " ***** DSTN untested! *****\n");
375 dstn_off *= hdcn >> 1;
377 dstn_off *= vdln >> 1;
379 ldsarl = sbase + dstn_off;
383 iowrite32(ldsarl, par->base + LDSARL); /* mem for lower half of DSTN */
385 encode_fix(&info->fix, info, stride);
386 sh7760fb_check_var(&info->var, info);
388 sh7760fb_blank(FB_BLANK_UNBLANK, info); /* panel on! */
390 dev_dbg(info->dev, "hdcn : %6d htcn : %6d\n", hdcn, htcn);
391 dev_dbg(info->dev, "hsynw : %6d hsynp : %6d\n", hsynw, hsynp);
392 dev_dbg(info->dev, "vdln : %6d vtln : %6d\n", vdln, vtln);
393 dev_dbg(info->dev, "vsynw : %6d vsynp : %6d\n", vsynw, vsynp);
394 dev_dbg(info->dev, "clksrc: %6d clkdiv: %6d\n",
395 (par->pd->ldickr >> 12) & 3, par->pd->ldickr & 0x1f);
396 dev_dbg(info->dev, "ldpmmr: 0x%04x ldpspr: 0x%04x\n", par->pd->ldpmmr,
398 dev_dbg(info->dev, "ldmtr : 0x%04x lddfr : 0x%04x\n", ldmtr, lddfr);
399 dev_dbg(info->dev, "ldlaor: %ld\n", stride);
400 dev_dbg(info->dev, "ldsaru: 0x%08lx ldsarl: 0x%08lx\n", sbase, ldsarl);
405 static struct fb_ops sh7760fb_ops = {
406 .owner = THIS_MODULE,
407 .fb_blank = sh7760fb_blank,
408 .fb_check_var = sh7760fb_check_var,
409 .fb_setcmap = sh7760fb_setcmap,
410 .fb_set_par = sh7760fb_set_par,
411 .fb_fillrect = cfb_fillrect,
412 .fb_copyarea = cfb_copyarea,
413 .fb_imageblit = cfb_imageblit,
416 static void sh7760fb_free_mem(struct fb_info *info)
418 struct sh7760fb_par *par = info->par;
420 if (!info->screen_base)
423 dma_free_coherent(info->dev, info->screen_size,
424 info->screen_base, par->fbdma);
427 info->screen_base = NULL;
428 info->screen_size = 0;
431 /* allocate the framebuffer memory. This memory must be in Area3,
432 * (dictated by the DMA engine) and contiguous, at a 512 byte boundary.
434 static int sh7760fb_alloc_mem(struct fb_info *info)
436 struct sh7760fb_par *par = info->par;
441 if (info->screen_base)
444 /* get color info from register value */
445 ret = sh7760fb_get_color_info(info->dev, par->pd->lddfr, &bpp, NULL);
447 printk(KERN_ERR "colinfo\n");
451 /* min VRAM: xres_min = 16, yres_min = 1, bpp = 1: 2byte -> 1 page
452 max VRAM: xres_max = 1024, yres_max = 1024, bpp = 16: 2MB */
454 vram = info->var.xres * info->var.yres;
455 if (info->var.grayscale) {
464 if ((vram < 1) || (vram > 1024 * 2048)) {
465 dev_dbg(info->dev, "too much VRAM required. Check settings\n");
469 if (vram < PAGE_SIZE)
472 fbmem = dma_alloc_coherent(info->dev, vram, &par->fbdma, GFP_KERNEL);
477 if ((par->fbdma & SH7760FB_DMA_MASK) != SH7760FB_DMA_MASK) {
478 sh7760fb_free_mem(info);
479 dev_err(info->dev, "kernel gave me memory at 0x%08lx, which is"
480 "unusable for the LCDC\n", (unsigned long)par->fbdma);
484 info->screen_base = fbmem;
485 info->screen_size = vram;
490 static int __devinit sh7760fb_probe(struct platform_device *pdev)
492 struct fb_info *info;
493 struct resource *res;
494 struct sh7760fb_par *par;
497 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
498 if (unlikely(res == NULL)) {
499 dev_err(&pdev->dev, "invalid resource\n");
503 info = framebuffer_alloc(sizeof(struct sh7760fb_par), &pdev->dev);
510 par->pd = pdev->dev.platform_data;
512 dev_dbg(info->dev, "no display setup data!\n");
517 par->ioarea = request_mem_region(res->start,
518 (res->end - res->start), pdev->name);
520 dev_err(&pdev->dev, "mmio area busy\n");
525 par->base = ioremap_nocache(res->start, res->end - res->start + 1);
527 dev_err(&pdev->dev, "cannot remap\n");
532 iowrite16(0, par->base + LDINTR); /* disable vsync irq */
533 par->irq = platform_get_irq(pdev, 0);
535 ret = request_irq(par->irq, sh7760fb_irq, 0,
536 "sh7760-lcdc", &par->vsync);
538 dev_err(&pdev->dev, "cannot grab IRQ\n");
541 disable_irq_nosync(par->irq);
544 fb_videomode_to_var(&info->var, par->pd->def_mode);
546 ret = sh7760fb_alloc_mem(info);
548 dev_dbg(info->dev, "framebuffer memory allocation failed!\n");
552 info->pseudo_palette = par->pseudo_palette;
554 /* fixup color register bitpositions. These are fixed by hardware */
555 info->var.red.offset = 11;
556 info->var.red.length = 5;
557 info->var.red.msb_right = 0;
559 info->var.green.offset = 5;
560 info->var.green.length = 6;
561 info->var.green.msb_right = 0;
563 info->var.blue.offset = 0;
564 info->var.blue.length = 5;
565 info->var.blue.msb_right = 0;
567 info->var.transp.offset = 0;
568 info->var.transp.length = 0;
569 info->var.transp.msb_right = 0;
571 /* set the DON2 bit now, before cmap allocation, as it will randomize
574 iowrite16(LDCNTR_DON2, par->base + LDCNTR);
575 info->fbops = &sh7760fb_ops;
577 ret = fb_alloc_cmap(&info->cmap, 256, 0);
579 dev_dbg(info->dev, "Unable to allocate cmap memory\n");
583 ret = register_framebuffer(info);
585 dev_dbg(info->dev, "cannot register fb!\n");
588 platform_set_drvdata(pdev, info);
590 printk(KERN_INFO "%s: memory at phys 0x%08lx-0x%08lx, size %ld KiB\n",
592 (unsigned long)par->fbdma,
593 (unsigned long)(par->fbdma + info->screen_size - 1),
594 info->screen_size >> 10);
599 sh7760fb_blank(FB_BLANK_POWERDOWN, info);
600 fb_dealloc_cmap(&info->cmap);
602 sh7760fb_free_mem(info);
605 free_irq(par->irq, &par->vsync);
608 release_resource(par->ioarea);
611 framebuffer_release(info);
615 static int __devexit sh7760fb_remove(struct platform_device *dev)
617 struct fb_info *info = platform_get_drvdata(dev);
618 struct sh7760fb_par *par = info->par;
620 sh7760fb_blank(FB_BLANK_POWERDOWN, info);
621 unregister_framebuffer(info);
622 fb_dealloc_cmap(&info->cmap);
623 sh7760fb_free_mem(info);
625 free_irq(par->irq, par);
627 release_resource(par->ioarea);
629 framebuffer_release(info);
630 platform_set_drvdata(dev, NULL);
635 static struct platform_driver sh7760_lcdc_driver = {
637 .name = "sh7760-lcdc",
638 .owner = THIS_MODULE,
640 .probe = sh7760fb_probe,
641 .remove = __devexit_p(sh7760fb_remove),
644 static int __init sh7760fb_init(void)
646 return platform_driver_register(&sh7760_lcdc_driver);
649 static void __exit sh7760fb_exit(void)
651 platform_driver_unregister(&sh7760_lcdc_driver);
654 module_init(sh7760fb_init);
655 module_exit(sh7760fb_exit);
657 MODULE_AUTHOR("Nobuhiro Iwamatsu, Manuel Lauss");
658 MODULE_DESCRIPTION("FBdev for SH7760/63 integrated LCD Controller");
659 MODULE_LICENSE("GPL");