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
32static struct fb_var_screeninfo hitfb_var = {
33	.activate	= FB_ACTIVATE_NOW,
34	.height		= -1,
35	.width		= -1,
36	.vmode		= FB_VMODE_NONINTERLACED,
37};
38
39static struct fb_fix_screeninfo hitfb_fix = {
40	.id		= "Hitachi HD64461",
41	.type		= FB_TYPE_PACKED_PIXELS,
42	.accel		= FB_ACCEL_NONE,
43};
44
45static volatile void __iomem *hitfb_offset_to_addr(unsigned int offset)
46{
47	return (__force volatile void __iomem *)(uintptr_t)offset;
48}
49
50static u16 hitfb_readw(unsigned int offset)
51{
52	return fb_readw(hitfb_offset_to_addr(offset));
53}
54
55static void hitfb_writew(u16 value, unsigned int offset)
56{
57	fb_writew(value, hitfb_offset_to_addr(offset));
58}
59
60static inline void hitfb_accel_wait(void)
61{
62	while (hitfb_readw(HD64461_GRCFGR) & HD64461_GRCFGR_ACCSTATUS)
63		;
64}
65
66static 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
75static 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
90static 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
140static 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
164static 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
172static 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
186static 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
222static 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
246static int hitfb_sync(struct fb_info *info)
247{
248	hitfb_accel_wait();
249
250	return 0;
251}
252
253static 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
304static 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
329static const struct fb_ops hitfb_ops = {
330	.owner		= THIS_MODULE,
331	__FB_DEFAULT_IOMEM_OPS_RDWR,
332	.fb_check_var	= hitfb_check_var,
333	.fb_set_par	= hitfb_set_par,
334	.fb_setcolreg	= hitfb_setcolreg,
335	.fb_blank	= hitfb_blank,
336	.fb_sync	= hitfb_sync,
337	.fb_pan_display = hitfb_pan_display,
338	.fb_fillrect	= hitfb_fillrect,
339	.fb_copyarea	= hitfb_copyarea,
340	.fb_imageblit	= cfb_imageblit,
341	__FB_DEFAULT_IOMEM_OPS_MMAP,
342};
343
344static int hitfb_probe(struct platform_device *dev)
345{
346	unsigned short lcdclor, ldr3, ldvndr;
347	struct fb_info *info;
348	int ret;
349
350	if (fb_get_options("hitfb", NULL))
351		return -ENODEV;
352
353	hitfb_fix.mmio_start = HD64461_IO_OFFSET(0x1000);
354	hitfb_fix.mmio_len = 0x1000;
355	hitfb_fix.smem_start = HD64461_IO_OFFSET(0x02000000);
356	hitfb_fix.smem_len = 512 * 1024;
357
358	lcdclor = hitfb_readw(HD64461_LCDCLOR);
359	ldvndr = hitfb_readw(HD64461_LDVNDR);
360	ldr3 = hitfb_readw(HD64461_LDR3);
361
362	switch (ldr3 & 15) {
363	default:
364	case 4:
365		hitfb_var.bits_per_pixel = 8;
366		hitfb_var.xres = lcdclor;
367		break;
368	case 8:
369		hitfb_var.bits_per_pixel = 16;
370		hitfb_var.xres = lcdclor / 2;
371		break;
372	}
373	hitfb_fix.line_length = lcdclor;
374	hitfb_fix.visual = (hitfb_var.bits_per_pixel == 8) ?
375	    FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
376	hitfb_var.yres = ldvndr + 1;
377	hitfb_var.xres_virtual = hitfb_var.xres;
378	hitfb_var.yres_virtual = hitfb_fix.smem_len / lcdclor;
379	switch (hitfb_var.bits_per_pixel) {
380	case 8:
381		hitfb_var.red.offset = 0;
382		hitfb_var.red.length = 8;
383		hitfb_var.green.offset = 0;
384		hitfb_var.green.length = 8;
385		hitfb_var.blue.offset = 0;
386		hitfb_var.blue.length = 8;
387		hitfb_var.transp.offset = 0;
388		hitfb_var.transp.length = 0;
389		break;
390	case 16:		/* RGB 565 */
391		hitfb_var.red.offset = 11;
392		hitfb_var.red.length = 5;
393		hitfb_var.green.offset = 5;
394		hitfb_var.green.length = 6;
395		hitfb_var.blue.offset = 0;
396		hitfb_var.blue.length = 5;
397		hitfb_var.transp.offset = 0;
398		hitfb_var.transp.length = 0;
399		break;
400	}
401
402	info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
403	if (unlikely(!info))
404		return -ENOMEM;
405
406	info->fbops = &hitfb_ops;
407	info->var = hitfb_var;
408	info->fix = hitfb_fix;
409	info->pseudo_palette = info->par;
410	info->flags = FBINFO_HWACCEL_YPAN |
411		FBINFO_HWACCEL_FILLRECT | FBINFO_HWACCEL_COPYAREA;
412
413	info->screen_base = (char __iomem *)(uintptr_t)hitfb_fix.smem_start;
414
415	ret = fb_alloc_cmap(&info->cmap, 256, 0);
416	if (unlikely(ret < 0))
417		goto err_fb;
418
419	ret = register_framebuffer(info);
420	if (unlikely(ret < 0))
421		goto err;
422
423	platform_set_drvdata(dev, info);
424
425	fb_info(info, "%s frame buffer device\n", info->fix.id);
426
427	return 0;
428
429err:
430	fb_dealloc_cmap(&info->cmap);
431err_fb:
432	framebuffer_release(info);
433	return ret;
434}
435
436static void hitfb_remove(struct platform_device *dev)
437{
438	struct fb_info *info = platform_get_drvdata(dev);
439
440	unregister_framebuffer(info);
441	fb_dealloc_cmap(&info->cmap);
442	framebuffer_release(info);
443}
444
445static int hitfb_suspend(struct device *dev)
446{
447	u16 v;
448
449	hitfb_blank(1, NULL);
450	v = hitfb_readw(HD64461_STBCR);
451	v |= HD64461_STBCR_SLCKE_IST;
452	hitfb_writew(v, HD64461_STBCR);
453
454	return 0;
455}
456
457static int hitfb_resume(struct device *dev)
458{
459	u16 v;
460
461	v = hitfb_readw(HD64461_STBCR);
462	v &= ~HD64461_STBCR_SLCKE_OST;
463	msleep(100);
464	v = hitfb_readw(HD64461_STBCR);
465	v &= ~HD64461_STBCR_SLCKE_IST;
466	hitfb_writew(v, HD64461_STBCR);
467	hitfb_blank(0, NULL);
468
469	return 0;
470}
471
472static const struct dev_pm_ops hitfb_dev_pm_ops = {
473	.suspend	= hitfb_suspend,
474	.resume		= hitfb_resume,
475};
476
477static struct platform_driver hitfb_driver = {
478	.probe		= hitfb_probe,
479	.remove_new	= hitfb_remove,
480	.driver		= {
481		.name	= "hitfb",
482		.pm	= &hitfb_dev_pm_ops,
483	},
484};
485
486static struct platform_device hitfb_device = {
487	.name	= "hitfb",
488	.id	= -1,
489};
490
491static int __init hitfb_init(void)
492{
493	int ret;
494
495	ret = platform_driver_register(&hitfb_driver);
496	if (!ret) {
497		ret = platform_device_register(&hitfb_device);
498		if (ret)
499			platform_driver_unregister(&hitfb_driver);
500	}
501	return ret;
502}
503
504
505static void __exit hitfb_exit(void)
506{
507	platform_device_unregister(&hitfb_device);
508	platform_driver_unregister(&hitfb_driver);
509}
510
511module_init(hitfb_init);
512module_exit(hitfb_exit);
513
514MODULE_LICENSE("GPL");
515