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!
17 * sh7760_setcolreg get from drivers/video/sh_mobile_lcdcfb.c
20 #include <linux/completion.h>
21 #include <linux/delay.h>
22 #include <linux/dma-mapping.h>
24 #include <linux/interrupt.h>
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28 #include <linux/platform_device.h>
30 #include <asm/sh7760fb.h>
36 struct sh7760fb_platdata *pd; /* display information */
38 dma_addr_t fbdma; /* physical address */
40 int rot; /* rotation enabled? */
42 u32 pseudo_palette[16];
44 struct platform_device *dev;
45 struct resource *ioarea;
46 struct completion vsync; /* vsync irq event */
49 static irqreturn_t sh7760fb_irq(int irq, void *data)
51 struct completion *c = data;
58 /* wait_for_lps - wait until power supply has reached a certain state. */
59 static int wait_for_lps(struct sh7760fb_par *par, int val)
62 while (--i && ((ioread16(par->base + LDPMMR) & 3) != val))
71 /* en/disable the LCDC */
72 static int sh7760fb_blank(int blank, struct fb_info *info)
74 struct sh7760fb_par *par = info->par;
75 struct sh7760fb_platdata *pd = par->pd;
76 unsigned short cntr = ioread16(par->base + LDCNTR);
77 unsigned short intr = ioread16(par->base + LDINTR);
80 if (blank == FB_BLANK_UNBLANK) {
82 cntr = LDCNTR_DON2 | LDCNTR_DON;
93 iowrite16(intr, par->base + LDINTR);
94 iowrite16(cntr, par->base + LDCNTR);
96 return wait_for_lps(par, lps);
99 static int sh7760_setcolreg (u_int regno,
100 u_int red, u_int green, u_int blue,
101 u_int transp, struct fb_info *info)
103 u32 *palette = info->pseudo_palette;
108 /* only FB_VISUAL_TRUECOLOR supported */
110 red >>= 16 - info->var.red.length;
111 green >>= 16 - info->var.green.length;
112 blue >>= 16 - info->var.blue.length;
113 transp >>= 16 - info->var.transp.length;
115 palette[regno] = (red << info->var.red.offset) |
116 (green << info->var.green.offset) |
117 (blue << info->var.blue.offset) |
118 (transp << info->var.transp.offset);
123 static void encode_fix(struct fb_fix_screeninfo *fix, struct fb_info *info,
124 unsigned long stride)
126 memset(fix, 0, sizeof(struct fb_fix_screeninfo));
127 strcpy(fix->id, "sh7760-lcdc");
129 fix->smem_start = (unsigned long)info->screen_base;
130 fix->smem_len = info->screen_size;
132 fix->line_length = stride;
135 static int sh7760fb_get_color_info(struct device *dev,
136 u16 lddfr, int *bpp, int *gray)
142 switch (lddfr & LDDFR_COLOR_MASK) {
143 case LDDFR_1BPP_MONO:
147 case LDDFR_2BPP_MONO:
151 case LDDFR_4BPP_MONO:
156 case LDDFR_6BPP_MONO:
161 case LDDFR_16BPP_RGB555:
162 case LDDFR_16BPP_RGB565:
167 dev_dbg(dev, "unsupported LDDFR bit depth.\n");
179 static int sh7760fb_check_var(struct fb_var_screeninfo *var,
180 struct fb_info *info)
182 struct fb_fix_screeninfo *fix = &info->fix;
183 struct sh7760fb_par *par = info->par;
186 /* get color info from register value */
187 ret = sh7760fb_get_color_info(info->dev, par->pd->lddfr, &bpp, NULL);
191 var->bits_per_pixel = bpp;
193 if ((var->grayscale) && (var->bits_per_pixel == 1))
194 fix->visual = FB_VISUAL_MONO10;
195 else if (var->bits_per_pixel >= 15)
196 fix->visual = FB_VISUAL_TRUECOLOR;
198 fix->visual = FB_VISUAL_PSEUDOCOLOR;
200 /* TODO: add some more validation here */
205 * sh7760fb_set_par - set videomode.
207 * NOTE: The rotation, grayscale and DSTN codepaths are
210 static int sh7760fb_set_par(struct fb_info *info)
212 struct sh7760fb_par *par = info->par;
213 struct fb_videomode *vm = par->pd->def_mode;
214 unsigned long sbase, dstn_off, ldsarl, stride;
215 unsigned short hsynp, hsynw, htcn, hdcn;
216 unsigned short vsynp, vsynw, vtln, vdln;
217 unsigned short lddfr, ldmtr;
220 par->rot = par->pd->rotate;
222 /* rotate only works with xres <= 320 */
223 if (par->rot && (vm->xres > 320)) {
224 dev_dbg(info->dev, "rotation disabled due to display size\n");
228 /* calculate LCDC reg vals from display parameters */
229 hsynp = vm->right_margin + vm->xres;
230 hsynw = vm->hsync_len;
231 htcn = vm->left_margin + hsynp + hsynw;
233 vsynp = vm->lower_margin + vm->yres;
234 vsynw = vm->vsync_len;
235 vtln = vm->upper_margin + vsynp + vsynw;
238 /* get color info from register value */
239 ret = sh7760fb_get_color_info(info->dev, par->pd->lddfr, &bpp, &gray);
243 dev_dbg(info->dev, "%dx%d %dbpp %s (orientation %s)\n", hdcn,
244 vdln, bpp, gray ? "grayscale" : "color",
245 par->rot ? "rotated" : "normal");
247 #ifdef CONFIG_CPU_LITTLE_ENDIAN
248 lddfr = par->pd->lddfr | (1 << 8);
250 lddfr = par->pd->lddfr & ~(1 << 8);
253 ldmtr = par->pd->ldmtr;
255 if (!(vm->sync & FB_SYNC_HOR_HIGH_ACT))
256 ldmtr |= LDMTR_CL1POL;
257 if (!(vm->sync & FB_SYNC_VERT_HIGH_ACT))
258 ldmtr |= LDMTR_FLMPOL;
260 /* shut down LCDC before changing display parameters */
261 sh7760fb_blank(FB_BLANK_POWERDOWN, info);
263 iowrite16(par->pd->ldickr, par->base + LDICKR); /* pixclock */
264 iowrite16(ldmtr, par->base + LDMTR); /* polarities */
265 iowrite16(lddfr, par->base + LDDFR); /* color/depth */
266 iowrite16((par->rot ? 1 << 13 : 0), par->base + LDSMR); /* rotate */
267 iowrite16(par->pd->ldpmmr, par->base + LDPMMR); /* Power Management */
268 iowrite16(par->pd->ldpspr, par->base + LDPSPR); /* Power Supply Ctrl */
270 /* display resolution */
271 iowrite16(((htcn >> 3) - 1) | (((hdcn >> 3) - 1) << 8),
273 iowrite16(vdln - 1, par->base + LDVDLNR);
274 iowrite16(vtln - 1, par->base + LDVTLNR);
275 /* h/v sync signals */
276 iowrite16((vsynp - 1) | ((vsynw - 1) << 12), par->base + LDVSYNR);
277 iowrite16(((hsynp >> 3) - 1) | (((hsynw >> 3) - 1) << 12),
278 par->base + LDHSYNR);
279 /* AC modulation sig */
280 iowrite16(par->pd->ldaclnr, par->base + LDACLNR);
282 stride = (par->rot) ? vtln : hdcn;
284 stride *= (bpp + 7) >> 3;
295 /* if rotated, stride must be power of 2 */
297 unsigned long bit = 1 << 31;
304 stride = bit << 1; /* not P-o-2, round up */
306 iowrite16(stride, par->base + LDLAOR);
308 /* set display mem start address */
309 sbase = (unsigned long)par->fbdma;
311 sbase += (hdcn - 1) * stride;
313 iowrite32(sbase, par->base + LDSARU);
316 * for DSTN need to set address for lower half.
317 * I (mlau) don't know which address to set it to,
318 * so I guessed at (stride * yres/2).
320 if (((ldmtr & 0x003f) >= LDMTR_DSTN_MONO_8) &&
321 ((ldmtr & 0x003f) <= LDMTR_DSTN_COLOR_16)) {
323 dev_dbg(info->dev, " ***** DSTN untested! *****\n");
327 dstn_off *= hdcn >> 1;
329 dstn_off *= vdln >> 1;
331 ldsarl = sbase + dstn_off;
335 iowrite32(ldsarl, par->base + LDSARL); /* mem for lower half of DSTN */
337 encode_fix(&info->fix, info, stride);
338 sh7760fb_check_var(&info->var, info);
340 sh7760fb_blank(FB_BLANK_UNBLANK, info); /* panel on! */
342 dev_dbg(info->dev, "hdcn : %6d htcn : %6d\n", hdcn, htcn);
343 dev_dbg(info->dev, "hsynw : %6d hsynp : %6d\n", hsynw, hsynp);
344 dev_dbg(info->dev, "vdln : %6d vtln : %6d\n", vdln, vtln);
345 dev_dbg(info->dev, "vsynw : %6d vsynp : %6d\n", vsynw, vsynp);
346 dev_dbg(info->dev, "clksrc: %6d clkdiv: %6d\n",
347 (par->pd->ldickr >> 12) & 3, par->pd->ldickr & 0x1f);
348 dev_dbg(info->dev, "ldpmmr: 0x%04x ldpspr: 0x%04x\n", par->pd->ldpmmr,
350 dev_dbg(info->dev, "ldmtr : 0x%04x lddfr : 0x%04x\n", ldmtr, lddfr);
351 dev_dbg(info->dev, "ldlaor: %ld\n", stride);
352 dev_dbg(info->dev, "ldsaru: 0x%08lx ldsarl: 0x%08lx\n", sbase, ldsarl);
357 static struct fb_ops sh7760fb_ops = {
358 .owner = THIS_MODULE,
359 .fb_blank = sh7760fb_blank,
360 .fb_check_var = sh7760fb_check_var,
361 .fb_setcolreg = sh7760_setcolreg,
362 .fb_set_par = sh7760fb_set_par,
363 .fb_fillrect = cfb_fillrect,
364 .fb_copyarea = cfb_copyarea,
365 .fb_imageblit = cfb_imageblit,
368 static void sh7760fb_free_mem(struct fb_info *info)
370 struct sh7760fb_par *par = info->par;
372 if (!info->screen_base)
375 dma_free_coherent(info->dev, info->screen_size,
376 info->screen_base, par->fbdma);
379 info->screen_base = NULL;
380 info->screen_size = 0;
383 /* allocate the framebuffer memory. This memory must be in Area3,
384 * (dictated by the DMA engine) and contiguous, at a 512 byte boundary.
386 static int sh7760fb_alloc_mem(struct fb_info *info)
388 struct sh7760fb_par *par = info->par;
393 if (info->screen_base)
396 /* get color info from register value */
397 ret = sh7760fb_get_color_info(info->dev, par->pd->lddfr, &bpp, NULL);
399 printk(KERN_ERR "colinfo\n");
403 /* min VRAM: xres_min = 16, yres_min = 1, bpp = 1: 2byte -> 1 page
404 max VRAM: xres_max = 1024, yres_max = 1024, bpp = 16: 2MB */
406 vram = info->var.xres * info->var.yres;
407 if (info->var.grayscale) {
416 if ((vram < 1) || (vram > 1024 * 2048)) {
417 dev_dbg(info->dev, "too much VRAM required. Check settings\n");
421 if (vram < PAGE_SIZE)
424 fbmem = dma_alloc_coherent(info->dev, vram, &par->fbdma, GFP_KERNEL);
429 if ((par->fbdma & SH7760FB_DMA_MASK) != SH7760FB_DMA_MASK) {
430 sh7760fb_free_mem(info);
431 dev_err(info->dev, "kernel gave me memory at 0x%08lx, which is"
432 "unusable for the LCDC\n", (unsigned long)par->fbdma);
436 info->screen_base = fbmem;
437 info->screen_size = vram;
442 static int __devinit sh7760fb_probe(struct platform_device *pdev)
444 struct fb_info *info;
445 struct resource *res;
446 struct sh7760fb_par *par;
449 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
450 if (unlikely(res == NULL)) {
451 dev_err(&pdev->dev, "invalid resource\n");
455 info = framebuffer_alloc(sizeof(struct sh7760fb_par), &pdev->dev);
462 par->pd = pdev->dev.platform_data;
464 dev_dbg(info->dev, "no display setup data!\n");
469 par->ioarea = request_mem_region(res->start,
470 (res->end - res->start), pdev->name);
472 dev_err(&pdev->dev, "mmio area busy\n");
477 par->base = ioremap_nocache(res->start, res->end - res->start + 1);
479 dev_err(&pdev->dev, "cannot remap\n");
484 iowrite16(0, par->base + LDINTR); /* disable vsync irq */
485 par->irq = platform_get_irq(pdev, 0);
487 ret = request_irq(par->irq, sh7760fb_irq, 0,
488 "sh7760-lcdc", &par->vsync);
490 dev_err(&pdev->dev, "cannot grab IRQ\n");
493 disable_irq_nosync(par->irq);
496 fb_videomode_to_var(&info->var, par->pd->def_mode);
498 ret = sh7760fb_alloc_mem(info);
500 dev_dbg(info->dev, "framebuffer memory allocation failed!\n");
504 info->pseudo_palette = par->pseudo_palette;
506 /* fixup color register bitpositions. These are fixed by hardware */
507 info->var.red.offset = 11;
508 info->var.red.length = 5;
509 info->var.red.msb_right = 0;
511 info->var.green.offset = 5;
512 info->var.green.length = 6;
513 info->var.green.msb_right = 0;
515 info->var.blue.offset = 0;
516 info->var.blue.length = 5;
517 info->var.blue.msb_right = 0;
519 info->var.transp.offset = 0;
520 info->var.transp.length = 0;
521 info->var.transp.msb_right = 0;
523 /* set the DON2 bit now, before cmap allocation, as it will randomize
526 iowrite16(LDCNTR_DON2, par->base + LDCNTR);
527 info->fbops = &sh7760fb_ops;
529 ret = fb_alloc_cmap(&info->cmap, 256, 0);
531 dev_dbg(info->dev, "Unable to allocate cmap memory\n");
535 ret = register_framebuffer(info);
537 dev_dbg(info->dev, "cannot register fb!\n");
540 platform_set_drvdata(pdev, info);
542 printk(KERN_INFO "%s: memory at phys 0x%08lx-0x%08lx, size %ld KiB\n",
544 (unsigned long)par->fbdma,
545 (unsigned long)(par->fbdma + info->screen_size - 1),
546 info->screen_size >> 10);
551 sh7760fb_blank(FB_BLANK_POWERDOWN, info);
552 fb_dealloc_cmap(&info->cmap);
554 sh7760fb_free_mem(info);
557 free_irq(par->irq, &par->vsync);
560 release_resource(par->ioarea);
563 framebuffer_release(info);
567 static int __devexit sh7760fb_remove(struct platform_device *dev)
569 struct fb_info *info = platform_get_drvdata(dev);
570 struct sh7760fb_par *par = info->par;
572 sh7760fb_blank(FB_BLANK_POWERDOWN, info);
573 unregister_framebuffer(info);
574 fb_dealloc_cmap(&info->cmap);
575 sh7760fb_free_mem(info);
577 free_irq(par->irq, par);
579 release_resource(par->ioarea);
581 framebuffer_release(info);
582 platform_set_drvdata(dev, NULL);
587 static struct platform_driver sh7760_lcdc_driver = {
589 .name = "sh7760-lcdc",
590 .owner = THIS_MODULE,
592 .probe = sh7760fb_probe,
593 .remove = __devexit_p(sh7760fb_remove),
596 static int __init sh7760fb_init(void)
598 return platform_driver_register(&sh7760_lcdc_driver);
601 static void __exit sh7760fb_exit(void)
603 platform_driver_unregister(&sh7760_lcdc_driver);
606 module_init(sh7760fb_init);
607 module_exit(sh7760fb_exit);
609 MODULE_AUTHOR("Nobuhiro Iwamatsu, Manuel Lauss");
610 MODULE_DESCRIPTION("FBdev for SH7760/63 integrated LCD Controller");
611 MODULE_LICENSE("GPL");