Free Electrons

Embedded Linux Experts

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
/*
 *  valkyriefb.c -- frame buffer device for the PowerMac 'valkyrie' display
 *
 *  Created 8 August 1998 by 
 *  Martin Costabel <costabel@wanadoo.fr> and Kevin Schoedel
 *
 *  Vmode-switching changes and vmode 15/17 modifications created 29 August
 *  1998 by Barry K. Nathan <barryn@pobox.com>.
 *
 *  Ported to m68k Macintosh by David Huggins-Daines <dhd@debian.org>
 *
 *  Derived directly from:
 *
 *   controlfb.c -- frame buffer device for the PowerMac 'control' display
 *   Copyright (C) 1998 Dan Jacobowitz <dan@debian.org>
 *
 *   pmc-valkyrie.c -- Console support for PowerMac "valkyrie" display adaptor.
 *   Copyright (C) 1997 Paul Mackerras.
 *
 *  and indirectly:
 *
 *  Frame buffer structure from:
 *    drivers/video/chipsfb.c -- frame buffer device for
 *    Chips & Technologies 65550 chip.
 *
 *    Copyright (C) 1998 Paul Mackerras
 *
 *    This file is derived from the Powermac "chips" driver:
 *    Copyright (C) 1997 Fabio Riccardi.
 *    And from the frame buffer device for Open Firmware-initialized devices:
 *    Copyright (C) 1997 Geert Uytterhoeven.
 *
 *  Hardware information from:
 *    control.c: Console support for PowerMac "control" display adaptor.
 *    Copyright (C) 1996 Paul Mackerras
 *
 *  This file is subject to the terms and conditions of the GNU General Public
 *  License. See the file COPYING in the main directory of this archive for
 *  more details.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/fb.h>
#include <linux/selection.h>
#include <linux/init.h>
#include <linux/nvram.h>
#include <linux/adb.h>
#include <linux/cuda.h>
#include <asm/io.h>
#ifdef CONFIG_MAC
#include <asm/macintosh.h>
#else
#include <asm/prom.h>
#endif
#include <asm/pgtable.h>

#include "macmodes.h"
#include "valkyriefb.h"

#ifdef CONFIG_MAC
/* We don't yet have functions to read the PRAM... perhaps we can
   adapt them from the PPC code? */
static int default_vmode = VMODE_CHOOSE;
static int default_cmode = CMODE_8;
#else
static int default_vmode = VMODE_NVRAM;
static int default_cmode = CMODE_NVRAM;
#endif

struct fb_par_valkyrie {
	int	vmode, cmode;
	int	xres, yres;
	int	vxres, vyres;
	struct valkyrie_regvals *init;
};

struct fb_info_valkyrie {
	struct fb_info		info;
	struct fb_par_valkyrie	par;
	struct cmap_regs	__iomem *cmap_regs;
	unsigned long		cmap_regs_phys;
	
	struct valkyrie_regs	__iomem *valkyrie_regs;
	unsigned long		valkyrie_regs_phys;
	
	__u8			__iomem *frame_buffer;
	unsigned long		frame_buffer_phys;
	
	int			sense;
	unsigned long		total_vram;

	u32			pseudo_palette[16];
};

/*
 * Exported functions
 */
int valkyriefb_init(void);
int valkyriefb_setup(char*);

static int valkyriefb_check_var(struct fb_var_screeninfo *var,
				struct fb_info *info);
static int valkyriefb_set_par(struct fb_info *info);
static int valkyriefb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
			     u_int transp, struct fb_info *info);
static int valkyriefb_blank(int blank_mode, struct fb_info *info);

static int read_valkyrie_sense(struct fb_info_valkyrie *p);
static void set_valkyrie_clock(unsigned char *params);
static int valkyrie_var_to_par(struct fb_var_screeninfo *var,
	struct fb_par_valkyrie *par, const struct fb_info *fb_info);

static int valkyrie_init_info(struct fb_info *info, struct fb_info_valkyrie *p);
static void valkyrie_par_to_fix(struct fb_par_valkyrie *par, struct fb_fix_screeninfo *fix);
static void valkyrie_init_fix(struct fb_fix_screeninfo *fix, struct fb_info_valkyrie *p);

static struct fb_ops valkyriefb_ops = {
	.owner =	THIS_MODULE,
	.fb_check_var =	valkyriefb_check_var,
	.fb_set_par =	valkyriefb_set_par,
	.fb_setcolreg =	valkyriefb_setcolreg,
	.fb_blank =	valkyriefb_blank,
	.fb_fillrect	= cfb_fillrect,
	.fb_copyarea	= cfb_copyarea,
	.fb_imageblit	= cfb_imageblit,
};

/* Sets the video mode according to info->var */
static int valkyriefb_set_par(struct fb_info *info)
{
	struct fb_info_valkyrie *p =
		container_of(info, struct fb_info_valkyrie, info);
	volatile struct valkyrie_regs __iomem *valkyrie_regs = p->valkyrie_regs;
	struct fb_par_valkyrie *par = info->par;
	struct valkyrie_regvals	*init;
	int err;

	if ((err = valkyrie_var_to_par(&info->var, par, info)))
		return err;

	valkyrie_par_to_fix(par, &info->fix);

	/* Reset the valkyrie */
	out_8(&valkyrie_regs->status.r, 0);
	udelay(100);

	/* Initialize display timing registers */
	init = par->init;
	out_8(&valkyrie_regs->mode.r, init->mode | 0x80);
	out_8(&valkyrie_regs->depth.r, par->cmode + 3);
	set_valkyrie_clock(init->clock_params);
	udelay(100);

	/* Turn on display */
	out_8(&valkyrie_regs->mode.r, init->mode);

	return 0;
}

static inline int valkyrie_par_to_var(struct fb_par_valkyrie *par,
				      struct fb_var_screeninfo *var)
{
	return mac_vmode_to_var(par->vmode, par->cmode, var);
}

static int
valkyriefb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
{
	int err;
	struct fb_par_valkyrie par;

	if ((err = valkyrie_var_to_par(var, &par, info)))
		return err;
	valkyrie_par_to_var(&par, var);
	return 0;
}

/*
 *  Blank the screen if blank_mode != 0, else unblank. If blank_mode == NULL
 *  then the caller blanks by setting the CLUT (Color Look Up Table) to all
 *  black. Return 0 if blanking succeeded, != 0 if un-/blanking failed due
 *  to e.g. a video mode which doesn't support it. Implements VESA suspend
 *  and powerdown modes on hardware that supports disabling hsync/vsync:
 *    blank_mode == 2: suspend vsync
 *    blank_mode == 3: suspend hsync
 *    blank_mode == 4: powerdown
 */
static int valkyriefb_blank(int blank_mode, struct fb_info *info)
{
	struct fb_info_valkyrie *p =
		container_of(info, struct fb_info_valkyrie, info);
	struct fb_par_valkyrie *par = info->par;
	struct valkyrie_regvals	*init = par->init;

	if (init == NULL)
		return 1;

	switch (blank_mode) {
	case FB_BLANK_UNBLANK:			/* unblank */
		out_8(&p->valkyrie_regs->mode.r, init->mode);
		break;
	case FB_BLANK_NORMAL:
		return 1;	/* get caller to set CLUT to all black */
	case FB_BLANK_VSYNC_SUSPEND:
	case FB_BLANK_HSYNC_SUSPEND:
		/*
		 * [kps] Value extracted from MacOS. I don't know
		 * whether this bit disables hsync or vsync, or
		 * whether the hardware can do the other as well.
		 */
		out_8(&p->valkyrie_regs->mode.r, init->mode | 0x40);
		break;
	case FB_BLANK_POWERDOWN:
		out_8(&p->valkyrie_regs->mode.r, 0x66);
		break;
	}
	return 0;
}

static int valkyriefb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
			     u_int transp, struct fb_info *info)
{
	struct fb_info_valkyrie *p =
		container_of(info, struct fb_info_valkyrie, info);
	volatile struct cmap_regs __iomem *cmap_regs = p->cmap_regs;
	struct fb_par_valkyrie *par = info->par;

	if (regno > 255)
		return 1;
	red >>= 8;
	green >>= 8;
	blue >>= 8;

	/* tell clut which address to fill */
	out_8(&p->cmap_regs->addr, regno);
	udelay(1);
	/* send one color channel at a time */
	out_8(&cmap_regs->lut, red);
	out_8(&cmap_regs->lut, green);
	out_8(&cmap_regs->lut, blue);

	if (regno < 16 && par->cmode == CMODE_16)
		((u32 *)info->pseudo_palette)[regno] =
			(regno << 10) | (regno << 5) | regno;

	return 0;
}

static inline int valkyrie_vram_reqd(int video_mode, int color_mode)
{
	int pitch;
	struct valkyrie_regvals *init = valkyrie_reg_init[video_mode-1];
	
	if ((pitch = init->pitch[color_mode]) == 0)
		pitch = 2 * init->pitch[0];
	return init->vres * pitch;
}

static void set_valkyrie_clock(unsigned char *params)
{
#ifdef CONFIG_ADB_CUDA
	struct adb_request req;
	int i;

	for (i = 0; i < 3; ++i) {
		cuda_request(&req, NULL, 5, CUDA_PACKET, CUDA_GET_SET_IIC,
			     0x50, i + 1, params[i]);
		while (!req.complete)
			cuda_poll();
	}
#endif
}

static void __init valkyrie_choose_mode(struct fb_info_valkyrie *p)
{
	p->sense = read_valkyrie_sense(p);
	printk(KERN_INFO "Monitor sense value = 0x%x\n", p->sense);

	/* Try to pick a video mode out of NVRAM if we have one. */
#if !defined(CONFIG_MAC) && defined(CONFIG_NVRAM)
	if (default_vmode == VMODE_NVRAM) {
		default_vmode = nvram_read_byte(NV_VMODE);
		if (default_vmode <= 0
		 || default_vmode > VMODE_MAX
		 || !valkyrie_reg_init[default_vmode - 1])
			default_vmode = VMODE_CHOOSE;
	}
#endif
	if (default_vmode == VMODE_CHOOSE)
		default_vmode = mac_map_monitor_sense(p->sense);
	if (!valkyrie_reg_init[default_vmode - 1])
		default_vmode = VMODE_640_480_67;
#if !defined(CONFIG_MAC) && defined(CONFIG_NVRAM)
	if (default_cmode == CMODE_NVRAM)
		default_cmode = nvram_read_byte(NV_CMODE);
#endif

	/*
	 * Reduce the pixel size if we don't have enough VRAM or bandwidth.
	 */
	if (default_cmode < CMODE_8 || default_cmode > CMODE_16
	    || valkyrie_reg_init[default_vmode-1]->pitch[default_cmode] == 0
	    || valkyrie_vram_reqd(default_vmode, default_cmode) > p->total_vram)
		default_cmode = CMODE_8;

	printk(KERN_INFO "using video mode %d and color mode %d.\n",
	       default_vmode, default_cmode);
}

int __init valkyriefb_init(void)
{
	struct fb_info_valkyrie	*p;
	unsigned long frame_buffer_phys, cmap_regs_phys, flags;
	int err;
	char *option = NULL;

	if (fb_get_options("valkyriefb", &option))
		return -ENODEV;
	valkyriefb_setup(option);

#ifdef CONFIG_MAC
	if (!MACH_IS_MAC)
		return -ENODEV;
	if (!(mac_bi_data.id == MAC_MODEL_Q630
	      /* I'm not sure about this one */
	    || mac_bi_data.id == MAC_MODEL_P588))
		return -ENODEV;

	/* Hardcoded addresses... welcome to 68k Macintosh country :-) */
	frame_buffer_phys = 0xf9000000;
	cmap_regs_phys = 0x50f24000;
	flags = IOMAP_NOCACHE_SER; /* IOMAP_WRITETHROUGH?? */
#else /* ppc (!CONFIG_MAC) */
	{
		struct device_node *dp;
		struct resource r;

		dp = of_find_node_by_name(NULL, "valkyrie");
		if (dp == 0)
			return 0;

		if (of_address_to_resource(dp, 0, &r)) {
			printk(KERN_ERR "can't find address for valkyrie\n");
			return 0;
		}

		frame_buffer_phys = r.start;
		cmap_regs_phys = r.start + 0x304000;
		flags = _PAGE_WRITETHRU;
	}
#endif /* ppc (!CONFIG_MAC) */

	p = kzalloc(sizeof(*p), GFP_ATOMIC);
	if (p == 0)
		return -ENOMEM;

	/* Map in frame buffer and registers */
	if (!request_mem_region(frame_buffer_phys, 0x100000, "valkyriefb")) {
		kfree(p);
		return 0;
	}
	p->total_vram = 0x100000;
	p->frame_buffer_phys = frame_buffer_phys;
	p->frame_buffer = __ioremap(frame_buffer_phys, p->total_vram, flags);
	p->cmap_regs_phys = cmap_regs_phys;
	p->cmap_regs = ioremap(p->cmap_regs_phys, 0x1000);
	p->valkyrie_regs_phys = cmap_regs_phys+0x6000;
	p->valkyrie_regs = ioremap(p->valkyrie_regs_phys, 0x1000);
	err = -ENOMEM;
	if (p->frame_buffer == NULL || p->cmap_regs == NULL
	    || p->valkyrie_regs == NULL) {
		printk(KERN_ERR "valkyriefb: couldn't map resources\n");
		goto out_free;
	}

	valkyrie_choose_mode(p);
	mac_vmode_to_var(default_vmode, default_cmode, &p->info.var);
	err = valkyrie_init_info(&p->info, p);
	if (err < 0)
		goto out_free;
	valkyrie_init_fix(&p->info.fix, p);
	if (valkyriefb_set_par(&p->info))
		/* "can't happen" */
		printk(KERN_ERR "valkyriefb: can't set default video mode\n");

	if ((err = register_framebuffer(&p->info)) != 0)
		goto out_cmap_free;

	fb_info(&p->info, "valkyrie frame buffer device\n");
	return 0;

 out_cmap_free:
	fb_dealloc_cmap(&p->info.cmap);
 out_free:
	if (p->frame_buffer)
		iounmap(p->frame_buffer);
	if (p->cmap_regs)
		iounmap(p->cmap_regs);
	if (p->valkyrie_regs)
		iounmap(p->valkyrie_regs);
	kfree(p);
	return err;
}

/*
 * Get the monitor sense value.
 */
static int read_valkyrie_sense(struct fb_info_valkyrie *p)
{
	int sense, in;

	out_8(&p->valkyrie_regs->msense.r, 0);   /* release all lines */
	__delay(20000);
	sense = ((in = in_8(&p->valkyrie_regs->msense.r)) & 0x70) << 4;
	/* drive each sense line low in turn and collect the other 2 */
	out_8(&p->valkyrie_regs->msense.r, 4);   /* drive A low */
	__delay(20000);
	sense |= ((in = in_8(&p->valkyrie_regs->msense.r)) & 0x30);
	out_8(&p->valkyrie_regs->msense.r, 2);   /* drive B low */
	__delay(20000);
	sense |= ((in = in_8(&p->valkyrie_regs->msense.r)) & 0x40) >> 3;
	sense |= (in & 0x10) >> 2;
	out_8(&p->valkyrie_regs->msense.r, 1);   /* drive C low */
	__delay(20000);
	sense |= ((in = in_8(&p->valkyrie_regs->msense.r)) & 0x60) >> 5;

	out_8(&p->valkyrie_regs->msense.r, 7);

	return sense;
}

/*
 * This routine takes a user-supplied var,
 * and picks the best vmode/cmode from it.
 */

/* [bkn] I did a major overhaul of this function.
 *
 * Much of the old code was "swiped by jonh from atyfb.c". Because
 * macmodes has mac_var_to_vmode, I felt that it would be better to
 * rework this function to use that, instead of reinventing the wheel to
 * add support for vmode 17. This was reinforced by the fact that
 * the previously swiped atyfb.c code is no longer there.
 *
 * So, I swiped and adapted platinum_var_to_par (from platinumfb.c), replacing
 * most, but not all, of the old code in the process. One side benefit of
 * swiping the platinumfb code is that we now have more comprehensible error
 * messages when a vmode/cmode switch fails. (Most of the error messages are
 * platinumfb.c, but I added two of my own, and I also changed some commas
 * into colons to make the messages more consistent with other Linux error
 * messages.) In addition, I think the new code *might* fix some vmode-
 * switching oddities, but I'm not sure.
 *
 * There may be some more opportunities for cleanup in here, but this is a
 * good start...
 */

static int valkyrie_var_to_par(struct fb_var_screeninfo *var,
	struct fb_par_valkyrie *par, const struct fb_info *fb_info)
{
	int vmode, cmode;
	struct valkyrie_regvals *init;
	struct fb_info_valkyrie *p =
		container_of(fb_info, struct fb_info_valkyrie, info);

	if (mac_var_to_vmode(var, &vmode, &cmode) != 0) {
		printk(KERN_ERR "valkyriefb: can't do %dx%dx%d.\n",
		       var->xres, var->yres, var->bits_per_pixel);
		return -EINVAL;
	}

	/* Check if we know about the wanted video mode */
	if (vmode < 1 || vmode > VMODE_MAX || !valkyrie_reg_init[vmode-1]) {
		printk(KERN_ERR "valkyriefb: vmode %d not valid.\n", vmode);
		return -EINVAL;
	}
	
	if (cmode != CMODE_8 && cmode != CMODE_16) {
		printk(KERN_ERR "valkyriefb: cmode %d not valid.\n", cmode);
		return -EINVAL;
	}

	if (var->xres_virtual > var->xres || var->yres_virtual > var->yres
	    || var->xoffset != 0 || var->yoffset != 0) {
		return -EINVAL;
	}

	init = valkyrie_reg_init[vmode-1];
	if (init->pitch[cmode] == 0) {
		printk(KERN_ERR "valkyriefb: vmode %d does not support "
		       "cmode %d.\n", vmode, cmode);
		return -EINVAL;
	}

	if (valkyrie_vram_reqd(vmode, cmode) > p->total_vram) {
		printk(KERN_ERR "valkyriefb: not enough ram for vmode %d, "
		       "cmode %d.\n", vmode, cmode);
		return -EINVAL;
	}

	par->vmode = vmode;
	par->cmode = cmode;
	par->init = init;
	par->xres = var->xres;
	par->yres = var->yres;
	par->vxres = par->xres;
	par->vyres = par->yres;

	return 0;
}

static void valkyrie_init_fix(struct fb_fix_screeninfo *fix, struct fb_info_valkyrie *p)
{
	memset(fix, 0, sizeof(*fix));
	strcpy(fix->id, "valkyrie");
	fix->mmio_start = p->valkyrie_regs_phys;
	fix->mmio_len = sizeof(struct valkyrie_regs);
	fix->type = FB_TYPE_PACKED_PIXELS;
	fix->smem_start = p->frame_buffer_phys + 0x1000;
	fix->smem_len = p->total_vram;

	fix->type_aux = 0;
	fix->ywrapstep = 0;
	fix->ypanstep = 0;
	fix->xpanstep = 0;
	
}

/* Fix must already be inited above */
static void valkyrie_par_to_fix(struct fb_par_valkyrie *par,
	struct fb_fix_screeninfo *fix)
{
	fix->smem_len = valkyrie_vram_reqd(par->vmode, par->cmode);
	fix->visual = (par->cmode == CMODE_8) ?
		FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_DIRECTCOLOR;
	fix->line_length = par->vxres << par->cmode;
		/* ywrapstep, xpanstep, ypanstep */
}

static int __init valkyrie_init_info(struct fb_info *info,
		struct fb_info_valkyrie *p)
{
	info->fbops = &valkyriefb_ops;
	info->screen_base = p->frame_buffer + 0x1000;
	info->flags = FBINFO_DEFAULT;
	info->pseudo_palette = p->pseudo_palette;
	info->par = &p->par;
	return fb_alloc_cmap(&info->cmap, 256, 0);
}


/*
 * Parse user specified options (`video=valkyriefb:')
 */
int __init valkyriefb_setup(char *options)
{
	char *this_opt;

	if (!options || !*options)
		return 0;

	while ((this_opt = strsep(&options, ",")) != NULL) {
		if (!strncmp(this_opt, "vmode:", 6)) {
	    		int vmode = simple_strtoul(this_opt+6, NULL, 0);
			if (vmode > 0 && vmode <= VMODE_MAX)
				default_vmode = vmode;
		}
		else if (!strncmp(this_opt, "cmode:", 6)) {
			int depth = simple_strtoul(this_opt+6, NULL, 0);
			switch (depth) {
			case 8:
				default_cmode = CMODE_8;
				break;
			case 15:
			case 16:
				default_cmode = CMODE_16;
				break;
			}
		}
	}
	return 0;
}

module_init(valkyriefb_init);
MODULE_LICENSE("GPL");