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