xref: /openbmc/linux/drivers/video/fbdev/hitfb.c (revision 6f2bde9b)
1 /*
2  * linux/drivers/video/hitfb.c -- Hitachi LCD frame buffer device
3  *
4  * (C) 1999 Mihai Spatar
5  * (C) 2000 YAEGASHI Takeshi
6  * (C) 2003, 2004 Paul Mundt
7  * (C) 2003, 2004, 2006 Andriy Skulysh
8  *
9  *  This file is subject to the terms and conditions of the GNU General Public
10  *  License. See the file COPYING in the main directory of this archive for
11  *  more details.
12  */
13 
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/errno.h>
17 #include <linux/string.h>
18 #include <linux/mm.h>
19 #include <linux/delay.h>
20 #include <linux/init.h>
21 #include <linux/platform_device.h>
22 #include <linux/fb.h>
23 
24 #include <asm/machvec.h>
25 #include <linux/uaccess.h>
26 #include <asm/io.h>
27 #include <asm/hd64461.h>
28 #include <cpu/dac.h>
29 
30 #define	WIDTH 640
31 
32 static struct fb_var_screeninfo hitfb_var = {
33 	.activate	= FB_ACTIVATE_NOW,
34 	.height		= -1,
35 	.width		= -1,
36 	.vmode		= FB_VMODE_NONINTERLACED,
37 };
38 
39 static struct fb_fix_screeninfo hitfb_fix = {
40 	.id		= "Hitachi HD64461",
41 	.type		= FB_TYPE_PACKED_PIXELS,
42 	.accel		= FB_ACCEL_NONE,
43 };
44 
45 static volatile void __iomem *hitfb_offset_to_addr(unsigned int offset)
46 {
47 	return (__force volatile void __iomem *)(uintptr_t)offset;
48 }
49 
50 static u16 hitfb_readw(unsigned int offset)
51 {
52 	return fb_readw(hitfb_offset_to_addr(offset));
53 }
54 
55 static void hitfb_writew(u16 value, unsigned int offset)
56 {
57 	fb_writew(value, hitfb_offset_to_addr(offset));
58 }
59 
60 static inline void hitfb_accel_wait(void)
61 {
62 	while (hitfb_readw(HD64461_GRCFGR) & HD64461_GRCFGR_ACCSTATUS)
63 		;
64 }
65 
66 static inline void hitfb_accel_start(int truecolor)
67 {
68 	if (truecolor) {
69 		hitfb_writew(6, HD64461_GRCFGR);
70 	} else {
71 		hitfb_writew(7, HD64461_GRCFGR);
72 	}
73 }
74 
75 static inline void hitfb_accel_set_dest(int truecolor, u16 dx, u16 dy,
76 					u16 width, u16 height)
77 {
78 	u32 saddr = WIDTH * dy + dx;
79 	if (truecolor)
80 		saddr <<= 1;
81 
82 	hitfb_writew(width-1, HD64461_BBTDWR);
83 	hitfb_writew(height-1, HD64461_BBTDHR);
84 
85 	hitfb_writew(saddr & 0xffff, HD64461_BBTDSARL);
86 	hitfb_writew(saddr >> 16, HD64461_BBTDSARH);
87 
88 }
89 
90 static inline void hitfb_accel_bitblt(int truecolor, u16 sx, u16 sy, u16 dx,
91 				      u16 dy, u16 width, u16 height, u16 rop,
92 				      u32 mask_addr)
93 {
94 	u32 saddr, daddr;
95 	u32 maddr = 0;
96 
97 	height--;
98 	width--;
99 	hitfb_writew(rop, HD64461_BBTROPR);
100 	if ((sy < dy) || ((sy == dy) && (sx <= dx))) {
101 		saddr = WIDTH * (sy + height) + sx + width;
102 		daddr = WIDTH * (dy + height) + dx + width;
103 		if (mask_addr) {
104 			if (truecolor)
105 				maddr = ((width >> 3) + 1) * (height + 1) - 1;
106 			else
107 				maddr =
108 				    (((width >> 4) + 1) * (height + 1) - 1) * 2;
109 
110 			hitfb_writew((1 << 5) | 1, HD64461_BBTMDR);
111 		} else
112 			hitfb_writew(1, HD64461_BBTMDR);
113 	} else {
114 		saddr = WIDTH * sy + sx;
115 		daddr = WIDTH * dy + dx;
116 		if (mask_addr) {
117 			hitfb_writew((1 << 5), HD64461_BBTMDR);
118 		} else {
119 			hitfb_writew(0, HD64461_BBTMDR);
120 		}
121 	}
122 	if (truecolor) {
123 		saddr <<= 1;
124 		daddr <<= 1;
125 	}
126 	hitfb_writew(width, HD64461_BBTDWR);
127 	hitfb_writew(height, HD64461_BBTDHR);
128 	hitfb_writew(saddr & 0xffff, HD64461_BBTSSARL);
129 	hitfb_writew(saddr >> 16, HD64461_BBTSSARH);
130 	hitfb_writew(daddr & 0xffff, HD64461_BBTDSARL);
131 	hitfb_writew(daddr >> 16, HD64461_BBTDSARH);
132 	if (mask_addr) {
133 		maddr += mask_addr;
134 		hitfb_writew(maddr & 0xffff, HD64461_BBTMARL);
135 		hitfb_writew(maddr >> 16, HD64461_BBTMARH);
136 	}
137 	hitfb_accel_start(truecolor);
138 }
139 
140 static void hitfb_fillrect(struct fb_info *p, const struct fb_fillrect *rect)
141 {
142 	if (rect->rop != ROP_COPY)
143 		cfb_fillrect(p, rect);
144 	else {
145 		hitfb_accel_wait();
146 		hitfb_writew(0x00f0, HD64461_BBTROPR);
147 		hitfb_writew(16, HD64461_BBTMDR);
148 
149 		if (p->var.bits_per_pixel == 16) {
150 			hitfb_writew(((u32 *) (p->pseudo_palette))[rect->color],
151 				  HD64461_GRSCR);
152 			hitfb_accel_set_dest(1, rect->dx, rect->dy, rect->width,
153 					     rect->height);
154 			hitfb_accel_start(1);
155 		} else {
156 			hitfb_writew(rect->color, HD64461_GRSCR);
157 			hitfb_accel_set_dest(0, rect->dx, rect->dy, rect->width,
158 					     rect->height);
159 			hitfb_accel_start(0);
160 		}
161 	}
162 }
163 
164 static void hitfb_copyarea(struct fb_info *p, const struct fb_copyarea *area)
165 {
166 	hitfb_accel_wait();
167 	hitfb_accel_bitblt(p->var.bits_per_pixel == 16, area->sx, area->sy,
168 			   area->dx, area->dy, area->width, area->height,
169 			   0x00cc, 0);
170 }
171 
172 static int hitfb_pan_display(struct fb_var_screeninfo *var,
173 			     struct fb_info *info)
174 {
175 	int xoffset = var->xoffset;
176 	int yoffset = var->yoffset;
177 
178 	if (xoffset != 0)
179 		return -EINVAL;
180 
181 	hitfb_writew((yoffset*info->fix.line_length)>>10, HD64461_LCDCBAR);
182 
183 	return 0;
184 }
185 
186 int hitfb_blank(int blank_mode, struct fb_info *info)
187 {
188 	unsigned short v;
189 
190 	if (blank_mode) {
191 		v = hitfb_readw(HD64461_LDR1);
192 		v &= ~HD64461_LDR1_DON;
193 		hitfb_writew(v, HD64461_LDR1);
194 
195 		v = hitfb_readw(HD64461_LCDCCR);
196 		v |= HD64461_LCDCCR_MOFF;
197 		hitfb_writew(v, HD64461_LCDCCR);
198 
199 		v = hitfb_readw(HD64461_STBCR);
200 		v |= HD64461_STBCR_SLCDST;
201 		hitfb_writew(v, HD64461_STBCR);
202 	} else {
203 		v = hitfb_readw(HD64461_STBCR);
204 		v &= ~HD64461_STBCR_SLCDST;
205 		hitfb_writew(v, HD64461_STBCR);
206 
207 		v = hitfb_readw(HD64461_LCDCCR);
208 		v &= ~(HD64461_LCDCCR_MOFF | HD64461_LCDCCR_STREQ);
209 		hitfb_writew(v, HD64461_LCDCCR);
210 
211 		do {
212 		    v = hitfb_readw(HD64461_LCDCCR);
213 		} while(v&HD64461_LCDCCR_STBACK);
214 
215 		v = hitfb_readw(HD64461_LDR1);
216 		v |= HD64461_LDR1_DON;
217 		hitfb_writew(v, HD64461_LDR1);
218 	}
219 	return 0;
220 }
221 
222 static int hitfb_setcolreg(unsigned regno, unsigned red, unsigned green,
223 			   unsigned blue, unsigned transp, struct fb_info *info)
224 {
225 	if (regno >= 256)
226 		return 1;
227 
228 	switch (info->var.bits_per_pixel) {
229 	case 8:
230 		hitfb_writew(regno << 8, HD64461_CPTWAR);
231 		hitfb_writew(red >> 10, HD64461_CPTWDR);
232 		hitfb_writew(green >> 10, HD64461_CPTWDR);
233 		hitfb_writew(blue >> 10, HD64461_CPTWDR);
234 		break;
235 	case 16:
236 		if (regno >= 16)
237 			return 1;
238 		((u32 *) (info->pseudo_palette))[regno] =
239 		    ((red & 0xf800)) |
240 		    ((green & 0xfc00) >> 5) | ((blue & 0xf800) >> 11);
241 		break;
242 	}
243 	return 0;
244 }
245 
246 static int hitfb_sync(struct fb_info *info)
247 {
248 	hitfb_accel_wait();
249 
250 	return 0;
251 }
252 
253 static int hitfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
254 {
255 	int maxy;
256 
257 	var->xres = info->var.xres;
258 	var->xres_virtual = info->var.xres;
259 	var->yres = info->var.yres;
260 
261 	if ((var->bits_per_pixel != 8) && (var->bits_per_pixel != 16))
262 		var->bits_per_pixel = info->var.bits_per_pixel;
263 
264 	if (var->yres_virtual < var->yres)
265 		var->yres_virtual = var->yres;
266 
267 	maxy = info->fix.smem_len / var->xres;
268 
269 	if (var->bits_per_pixel == 16)
270 		maxy /= 2;
271 
272 	if (var->yres_virtual > maxy)
273 		var->yres_virtual = maxy;
274 
275 	var->xoffset = 0;
276 	var->yoffset = 0;
277 
278 	switch (var->bits_per_pixel) {
279 	case 8:
280 		var->red.offset = 0;
281 		var->red.length = 8;
282 		var->green.offset = 0;
283 		var->green.length = 8;
284 		var->blue.offset = 0;
285 		var->blue.length = 8;
286 		var->transp.offset = 0;
287 		var->transp.length = 0;
288 		break;
289 	case 16:		/* RGB 565 */
290 		var->red.offset = 11;
291 		var->red.length = 5;
292 		var->green.offset = 5;
293 		var->green.length = 6;
294 		var->blue.offset = 0;
295 		var->blue.length = 5;
296 		var->transp.offset = 0;
297 		var->transp.length = 0;
298 		break;
299 	}
300 
301 	return 0;
302 }
303 
304 static int hitfb_set_par(struct fb_info *info)
305 {
306 	unsigned short ldr3;
307 
308 	switch (info->var.bits_per_pixel) {
309 	case 8:
310 		info->fix.line_length = info->var.xres;
311 		info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
312 		info->fix.ypanstep = 16;
313 		break;
314 	case 16:
315 		info->fix.line_length = info->var.xres*2;
316 		info->fix.visual = FB_VISUAL_TRUECOLOR;
317 		info->fix.ypanstep = 8;
318 		break;
319 	}
320 
321 	hitfb_writew(info->fix.line_length, HD64461_LCDCLOR);
322 	ldr3 = hitfb_readw(HD64461_LDR3);
323 	ldr3 &= ~15;
324 	ldr3 |= (info->var.bits_per_pixel == 8) ? 4 : 8;
325 	hitfb_writew(ldr3, HD64461_LDR3);
326 	return 0;
327 }
328 
329 static const struct fb_ops hitfb_ops = {
330 	.owner		= THIS_MODULE,
331 	.fb_check_var	= hitfb_check_var,
332 	.fb_set_par		= hitfb_set_par,
333 	.fb_setcolreg	= hitfb_setcolreg,
334 	.fb_blank	= hitfb_blank,
335 	.fb_sync	= hitfb_sync,
336 	.fb_pan_display = hitfb_pan_display,
337 	.fb_fillrect	= hitfb_fillrect,
338 	.fb_copyarea	= hitfb_copyarea,
339 	.fb_imageblit	= cfb_imageblit,
340 };
341 
342 static int hitfb_probe(struct platform_device *dev)
343 {
344 	unsigned short lcdclor, ldr3, ldvndr;
345 	struct fb_info *info;
346 	int ret;
347 
348 	if (fb_get_options("hitfb", NULL))
349 		return -ENODEV;
350 
351 	hitfb_fix.mmio_start = HD64461_IO_OFFSET(0x1000);
352 	hitfb_fix.mmio_len = 0x1000;
353 	hitfb_fix.smem_start = HD64461_IO_OFFSET(0x02000000);
354 	hitfb_fix.smem_len = 512 * 1024;
355 
356 	lcdclor = hitfb_readw(HD64461_LCDCLOR);
357 	ldvndr = hitfb_readw(HD64461_LDVNDR);
358 	ldr3 = hitfb_readw(HD64461_LDR3);
359 
360 	switch (ldr3 & 15) {
361 	default:
362 	case 4:
363 		hitfb_var.bits_per_pixel = 8;
364 		hitfb_var.xres = lcdclor;
365 		break;
366 	case 8:
367 		hitfb_var.bits_per_pixel = 16;
368 		hitfb_var.xres = lcdclor / 2;
369 		break;
370 	}
371 	hitfb_fix.line_length = lcdclor;
372 	hitfb_fix.visual = (hitfb_var.bits_per_pixel == 8) ?
373 	    FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
374 	hitfb_var.yres = ldvndr + 1;
375 	hitfb_var.xres_virtual = hitfb_var.xres;
376 	hitfb_var.yres_virtual = hitfb_fix.smem_len / lcdclor;
377 	switch (hitfb_var.bits_per_pixel) {
378 	case 8:
379 		hitfb_var.red.offset = 0;
380 		hitfb_var.red.length = 8;
381 		hitfb_var.green.offset = 0;
382 		hitfb_var.green.length = 8;
383 		hitfb_var.blue.offset = 0;
384 		hitfb_var.blue.length = 8;
385 		hitfb_var.transp.offset = 0;
386 		hitfb_var.transp.length = 0;
387 		break;
388 	case 16:		/* RGB 565 */
389 		hitfb_var.red.offset = 11;
390 		hitfb_var.red.length = 5;
391 		hitfb_var.green.offset = 5;
392 		hitfb_var.green.length = 6;
393 		hitfb_var.blue.offset = 0;
394 		hitfb_var.blue.length = 5;
395 		hitfb_var.transp.offset = 0;
396 		hitfb_var.transp.length = 0;
397 		break;
398 	}
399 
400 	info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
401 	if (unlikely(!info))
402 		return -ENOMEM;
403 
404 	info->fbops = &hitfb_ops;
405 	info->var = hitfb_var;
406 	info->fix = hitfb_fix;
407 	info->pseudo_palette = info->par;
408 	info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN |
409 		FBINFO_HWACCEL_FILLRECT | FBINFO_HWACCEL_COPYAREA;
410 
411 	info->screen_base = (void *)hitfb_fix.smem_start;
412 
413 	ret = fb_alloc_cmap(&info->cmap, 256, 0);
414 	if (unlikely(ret < 0))
415 		goto err_fb;
416 
417 	ret = register_framebuffer(info);
418 	if (unlikely(ret < 0))
419 		goto err;
420 
421 	platform_set_drvdata(dev, info);
422 
423 	fb_info(info, "%s frame buffer device\n", info->fix.id);
424 
425 	return 0;
426 
427 err:
428 	fb_dealloc_cmap(&info->cmap);
429 err_fb:
430 	framebuffer_release(info);
431 	return ret;
432 }
433 
434 static void hitfb_remove(struct platform_device *dev)
435 {
436 	struct fb_info *info = platform_get_drvdata(dev);
437 
438 	unregister_framebuffer(info);
439 	fb_dealloc_cmap(&info->cmap);
440 	framebuffer_release(info);
441 }
442 
443 static int hitfb_suspend(struct device *dev)
444 {
445 	u16 v;
446 
447 	hitfb_blank(1,0);
448 	v = hitfb_readw(HD64461_STBCR);
449 	v |= HD64461_STBCR_SLCKE_IST;
450 	hitfb_writew(v, HD64461_STBCR);
451 
452 	return 0;
453 }
454 
455 static int hitfb_resume(struct device *dev)
456 {
457 	u16 v;
458 
459 	v = hitfb_readw(HD64461_STBCR);
460 	v &= ~HD64461_STBCR_SLCKE_OST;
461 	msleep(100);
462 	v = hitfb_readw(HD64461_STBCR);
463 	v &= ~HD64461_STBCR_SLCKE_IST;
464 	hitfb_writew(v, HD64461_STBCR);
465 	hitfb_blank(0,0);
466 
467 	return 0;
468 }
469 
470 static const struct dev_pm_ops hitfb_dev_pm_ops = {
471 	.suspend	= hitfb_suspend,
472 	.resume		= hitfb_resume,
473 };
474 
475 static struct platform_driver hitfb_driver = {
476 	.probe		= hitfb_probe,
477 	.remove_new	= hitfb_remove,
478 	.driver		= {
479 		.name	= "hitfb",
480 		.pm	= &hitfb_dev_pm_ops,
481 	},
482 };
483 
484 static struct platform_device hitfb_device = {
485 	.name	= "hitfb",
486 	.id	= -1,
487 };
488 
489 static int __init hitfb_init(void)
490 {
491 	int ret;
492 
493 	ret = platform_driver_register(&hitfb_driver);
494 	if (!ret) {
495 		ret = platform_device_register(&hitfb_device);
496 		if (ret)
497 			platform_driver_unregister(&hitfb_driver);
498 	}
499 	return ret;
500 }
501 
502 
503 static void __exit hitfb_exit(void)
504 {
505 	platform_device_unregister(&hitfb_device);
506 	platform_driver_unregister(&hitfb_driver);
507 }
508 
509 module_init(hitfb_init);
510 module_exit(hitfb_exit);
511 
512 MODULE_LICENSE("GPL");
513