xref: /openbmc/linux/drivers/video/fbdev/controlfb.c (revision a0331a4b)
1 /*
2  *  controlfb.c -- frame buffer device for the PowerMac 'control' display
3  *
4  *  Created 12 July 1998 by Dan Jacobowitz <dan@debian.org>
5  *  Copyright (C) 1998 Dan Jacobowitz
6  *  Copyright (C) 2001 Takashi Oe
7  *
8  *  Mmap code by Michel Lanners <mlan@cpu.lu>
9  *
10  *  Frame buffer structure from:
11  *    drivers/video/chipsfb.c -- frame buffer device for
12  *    Chips & Technologies 65550 chip.
13  *
14  *    Copyright (C) 1998 Paul Mackerras
15  *
16  *    This file is derived from the Powermac "chips" driver:
17  *    Copyright (C) 1997 Fabio Riccardi.
18  *    And from the frame buffer device for Open Firmware-initialized devices:
19  *    Copyright (C) 1997 Geert Uytterhoeven.
20  *
21  *  Hardware information from:
22  *    control.c: Console support for PowerMac "control" display adaptor.
23  *    Copyright (C) 1996 Paul Mackerras
24  *
25  *  Updated to 2.5 framebuffer API by Ben Herrenschmidt
26  *  <benh@kernel.crashing.org>, Paul Mackerras <paulus@samba.org>,
27  *  and James Simmons <jsimmons@infradead.org>.
28  *
29  *  This file is subject to the terms and conditions of the GNU General Public
30  *  License. See the file COPYING in the main directory of this archive for
31  *  more details.
32  */
33 
34 #include <linux/kernel.h>
35 #include <linux/errno.h>
36 #include <linux/string.h>
37 #include <linux/mm.h>
38 #include <linux/slab.h>
39 #include <linux/vmalloc.h>
40 #include <linux/delay.h>
41 #include <linux/interrupt.h>
42 #include <linux/of.h>
43 #include <linux/of_address.h>
44 #include <linux/fb.h>
45 #include <linux/init.h>
46 #include <linux/pci.h>
47 #include <linux/nvram.h>
48 #include <linux/adb.h>
49 #include <linux/cuda.h>
50 #ifdef CONFIG_BOOTX_TEXT
51 #include <asm/btext.h>
52 #endif
53 
54 #include "macmodes.h"
55 #include "controlfb.h"
56 
57 #if !defined(CONFIG_PPC_PMAC) || !defined(CONFIG_PPC32)
58 #define invalid_vram_cache(addr)
59 #undef in_8
60 #undef out_8
61 #undef in_le32
62 #undef out_le32
63 #define in_8(addr)		0
64 #define out_8(addr, val)	(void)(val)
65 #define in_le32(addr)		0
66 #define out_le32(addr, val)	(void)(val)
67 #ifndef pgprot_cached_wthru
68 #define pgprot_cached_wthru(prot) (prot)
69 #endif
70 #else
invalid_vram_cache(void __force * addr)71 static void invalid_vram_cache(void __force *addr)
72 {
73 	eieio();
74 	dcbf(addr);
75 	mb();
76 	eieio();
77 	dcbf(addr);
78 	mb();
79 }
80 #endif
81 
82 struct fb_par_control {
83 	int	vmode, cmode;
84 	int	xres, yres;
85 	int	vxres, vyres;
86 	int	xoffset, yoffset;
87 	int	pitch;
88 	struct control_regvals	regvals;
89 	unsigned long sync;
90 	unsigned char ctrl;
91 };
92 
93 #define DIRTY(z) ((x)->z != (y)->z)
94 #define DIRTY_CMAP(z) (memcmp(&((x)->z), &((y)->z), sizeof((y)->z)))
PAR_EQUAL(struct fb_par_control * x,struct fb_par_control * y)95 static inline int PAR_EQUAL(struct fb_par_control *x, struct fb_par_control *y)
96 {
97 	int i, results;
98 
99 	results = 1;
100 	for (i = 0; i < 3; i++)
101 		results &= !DIRTY(regvals.clock_params[i]);
102 	if (!results)
103 		return 0;
104 	for (i = 0; i < 16; i++)
105 		results &= !DIRTY(regvals.regs[i]);
106 	if (!results)
107 		return 0;
108 	return (!DIRTY(cmode) && !DIRTY(xres) && !DIRTY(yres)
109 		&& !DIRTY(vxres) && !DIRTY(vyres));
110 }
111 
112 struct fb_info_control {
113 	struct fb_info		info;
114 	struct fb_par_control	par;
115 	u32			pseudo_palette[16];
116 
117 	struct cmap_regs	__iomem *cmap_regs;
118 	unsigned long		cmap_regs_phys;
119 
120 	struct control_regs	__iomem *control_regs;
121 	unsigned long		control_regs_phys;
122 	unsigned long		control_regs_size;
123 
124 	__u8			__iomem *frame_buffer;
125 	unsigned long		frame_buffer_phys;
126 	unsigned long		fb_orig_base;
127 	unsigned long		fb_orig_size;
128 
129 	int			control_use_bank2;
130 	unsigned long		total_vram;
131 	unsigned char		vram_attr;
132 };
133 
134 /* control register access macro */
135 #define CNTRL_REG(INFO,REG) (&(((INFO)->control_regs->REG).r))
136 
137 
138 /************************** Internal variables *******************************/
139 
140 static struct fb_info_control *control_fb;
141 
142 static int default_vmode __initdata = VMODE_NVRAM;
143 static int default_cmode __initdata = CMODE_NVRAM;
144 
145 
controlfb_setcolreg(u_int regno,u_int red,u_int green,u_int blue,u_int transp,struct fb_info * info)146 static int controlfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
147 			     u_int transp, struct fb_info *info)
148 {
149 	struct fb_info_control *p =
150 		container_of(info, struct fb_info_control, info);
151 	__u8 r, g, b;
152 
153 	if (regno > 255)
154 		return 1;
155 
156 	r = red >> 8;
157 	g = green >> 8;
158 	b = blue >> 8;
159 
160 	out_8(&p->cmap_regs->addr, regno);	/* tell clut what addr to fill	*/
161 	out_8(&p->cmap_regs->lut, r);		/* send one color channel at	*/
162 	out_8(&p->cmap_regs->lut, g);		/* a time...			*/
163 	out_8(&p->cmap_regs->lut, b);
164 
165 	if (regno < 16) {
166 		int i;
167 		switch (p->par.cmode) {
168 		case CMODE_16:
169 			p->pseudo_palette[regno] =
170 			    (regno << 10) | (regno << 5) | regno;
171 			break;
172 		case CMODE_32:
173 			i = (regno << 8) | regno;
174 			p->pseudo_palette[regno] = (i << 16) | i;
175 			break;
176 		}
177 	}
178 
179 	return 0;
180 }
181 
182 
183 /********************  End of controlfb_ops implementation  ******************/
184 
185 
186 
set_control_clock(unsigned char * params)187 static void set_control_clock(unsigned char *params)
188 {
189 #ifdef CONFIG_ADB_CUDA
190 	struct adb_request req;
191 	int i;
192 
193 	for (i = 0; i < 3; ++i) {
194 		cuda_request(&req, NULL, 5, CUDA_PACKET, CUDA_GET_SET_IIC,
195 			     0x50, i + 1, params[i]);
196 		while (!req.complete)
197 			cuda_poll();
198 	}
199 #endif
200 }
201 
202 /*
203  * Set screen start address according to var offset values
204  */
set_screen_start(int xoffset,int yoffset,struct fb_info_control * p)205 static inline void set_screen_start(int xoffset, int yoffset,
206 	struct fb_info_control *p)
207 {
208 	struct fb_par_control *par = &p->par;
209 
210 	par->xoffset = xoffset;
211 	par->yoffset = yoffset;
212 	out_le32(CNTRL_REG(p,start_addr),
213 		 par->yoffset * par->pitch + (par->xoffset << par->cmode));
214 }
215 
216 #define RADACAL_WRITE(a,d) \
217 	out_8(&p->cmap_regs->addr, (a)); \
218 	out_8(&p->cmap_regs->dat,   (d))
219 
220 /* Now how about actually saying, Make it so! */
221 /* Some things in here probably don't need to be done each time. */
control_set_hardware(struct fb_info_control * p,struct fb_par_control * par)222 static void control_set_hardware(struct fb_info_control *p, struct fb_par_control *par)
223 {
224 	struct control_regvals	*r;
225 	volatile struct preg	__iomem *rp;
226 	int			i, cmode;
227 
228 	if (PAR_EQUAL(&p->par, par)) {
229 		/*
230 		 * check if only xoffset or yoffset differs.
231 		 * this prevents flickers in typical VT switch case.
232 		 */
233 		if (p->par.xoffset != par->xoffset ||
234 		    p->par.yoffset != par->yoffset)
235 			set_screen_start(par->xoffset, par->yoffset, p);
236 
237 		return;
238 	}
239 
240 	p->par = *par;
241 	cmode = p->par.cmode;
242 	r = &par->regvals;
243 
244 	/* Turn off display */
245 	out_le32(CNTRL_REG(p,ctrl), 0x400 | par->ctrl);
246 
247 	set_control_clock(r->clock_params);
248 
249 	RADACAL_WRITE(0x20, r->radacal_ctrl);
250 	RADACAL_WRITE(0x21, p->control_use_bank2 ? 0 : 1);
251 	RADACAL_WRITE(0x10, 0);
252 	RADACAL_WRITE(0x11, 0);
253 
254 	rp = &p->control_regs->vswin;
255 	for (i = 0; i < 16; ++i, ++rp)
256 		out_le32(&rp->r, r->regs[i]);
257 
258 	out_le32(CNTRL_REG(p,pitch), par->pitch);
259 	out_le32(CNTRL_REG(p,mode), r->mode);
260 	out_le32(CNTRL_REG(p,vram_attr), p->vram_attr);
261 	out_le32(CNTRL_REG(p,start_addr), par->yoffset * par->pitch
262 		 + (par->xoffset << cmode));
263 	out_le32(CNTRL_REG(p,rfrcnt), 0x1e5);
264 	out_le32(CNTRL_REG(p,intr_ena), 0);
265 
266 	/* Turn on display */
267 	out_le32(CNTRL_REG(p,ctrl), par->ctrl);
268 
269 #ifdef CONFIG_BOOTX_TEXT
270 	btext_update_display(p->frame_buffer_phys + CTRLFB_OFF,
271 			     p->par.xres, p->par.yres,
272 			     (cmode == CMODE_32? 32: cmode == CMODE_16? 16: 8),
273 			     p->par.pitch);
274 #endif /* CONFIG_BOOTX_TEXT */
275 }
276 
277 /* Work out which banks of VRAM we have installed. */
278 /* danj: I guess the card just ignores writes to nonexistant VRAM... */
279 
find_vram_size(struct fb_info_control * p)280 static void __init find_vram_size(struct fb_info_control *p)
281 {
282 	int bank1, bank2;
283 
284 	/*
285 	 * Set VRAM in 2MB (bank 1) mode
286 	 * VRAM Bank 2 will be accessible through offset 0x600000 if present
287 	 * and VRAM Bank 1 will not respond at that offset even if present
288 	 */
289 	out_le32(CNTRL_REG(p,vram_attr), 0x31);
290 
291 	out_8(&p->frame_buffer[0x600000], 0xb3);
292 	out_8(&p->frame_buffer[0x600001], 0x71);
293 	invalid_vram_cache(&p->frame_buffer[0x600000]);
294 
295 	bank2 = (in_8(&p->frame_buffer[0x600000]) == 0xb3)
296 		&& (in_8(&p->frame_buffer[0x600001]) == 0x71);
297 
298 	/*
299 	 * Set VRAM in 2MB (bank 2) mode
300 	 * VRAM Bank 1 will be accessible through offset 0x000000 if present
301 	 * and VRAM Bank 2 will not respond at that offset even if present
302 	 */
303 	out_le32(CNTRL_REG(p,vram_attr), 0x39);
304 
305 	out_8(&p->frame_buffer[0], 0x5a);
306 	out_8(&p->frame_buffer[1], 0xc7);
307 	invalid_vram_cache(&p->frame_buffer[0]);
308 
309 	bank1 = (in_8(&p->frame_buffer[0]) == 0x5a)
310 		&& (in_8(&p->frame_buffer[1]) == 0xc7);
311 
312 	if (bank2) {
313 		if (!bank1) {
314 			/*
315 			 * vram bank 2 only
316 			 */
317 			p->control_use_bank2 = 1;
318 			p->vram_attr = 0x39;
319 			p->frame_buffer += 0x600000;
320 			p->frame_buffer_phys += 0x600000;
321 		} else {
322 			/*
323 			 * 4 MB vram
324 			 */
325 			p->vram_attr = 0x51;
326 		}
327 	} else {
328 		/*
329 		 * vram bank 1 only
330 		 */
331 		p->vram_attr = 0x31;
332 	}
333 
334         p->total_vram = (bank1 + bank2) * 0x200000;
335 
336 	printk(KERN_INFO "controlfb: VRAM Total = %dMB "
337 			"(%dMB @ bank 1, %dMB @ bank 2)\n",
338 			(bank1 + bank2) << 1, bank1 << 1, bank2 << 1);
339 }
340 
341 /*
342  * Get the monitor sense value.
343  * Note that this can be called before calibrate_delay,
344  * so we can't use udelay.
345  */
read_control_sense(struct fb_info_control * p)346 static int read_control_sense(struct fb_info_control *p)
347 {
348 	int sense;
349 
350 	out_le32(CNTRL_REG(p,mon_sense), 7);	/* drive all lines high */
351 	__delay(200);
352 	out_le32(CNTRL_REG(p,mon_sense), 077);	/* turn off drivers */
353 	__delay(2000);
354 	sense = (in_le32(CNTRL_REG(p,mon_sense)) & 0x1c0) << 2;
355 
356 	/* drive each sense line low in turn and collect the other 2 */
357 	out_le32(CNTRL_REG(p,mon_sense), 033);	/* drive A low */
358 	__delay(2000);
359 	sense |= (in_le32(CNTRL_REG(p,mon_sense)) & 0xc0) >> 2;
360 	out_le32(CNTRL_REG(p,mon_sense), 055);	/* drive B low */
361 	__delay(2000);
362 	sense |= ((in_le32(CNTRL_REG(p,mon_sense)) & 0x100) >> 5)
363 		| ((in_le32(CNTRL_REG(p,mon_sense)) & 0x40) >> 4);
364 	out_le32(CNTRL_REG(p,mon_sense), 066);	/* drive C low */
365 	__delay(2000);
366 	sense |= (in_le32(CNTRL_REG(p,mon_sense)) & 0x180) >> 7;
367 
368 	out_le32(CNTRL_REG(p,mon_sense), 077);	/* turn off drivers */
369 
370 	return sense;
371 }
372 
373 /**********************  Various translation functions  **********************/
374 
375 #define CONTROL_PIXCLOCK_BASE	256016
376 #define CONTROL_PIXCLOCK_MIN	5000	/* ~ 200 MHz dot clock */
377 
378 /*
379  * calculate the clock parameters to be sent to CUDA according to given
380  * pixclock in pico second.
381  */
calc_clock_params(unsigned long clk,unsigned char * param)382 static int calc_clock_params(unsigned long clk, unsigned char *param)
383 {
384 	unsigned long p0, p1, p2, k, l, m, n, min;
385 
386 	if (clk > (CONTROL_PIXCLOCK_BASE << 3))
387 		return 1;
388 
389 	p2 = ((clk << 4) < CONTROL_PIXCLOCK_BASE)? 3: 2;
390 	l = clk << p2;
391 	p0 = 0;
392 	p1 = 0;
393 	for (k = 1, min = l; k < 32; k++) {
394 		unsigned long rem;
395 
396 		m = CONTROL_PIXCLOCK_BASE * k;
397 		n = m / l;
398 		rem = m % l;
399 		if (n && (n < 128) && rem < min) {
400 			p0 = k;
401 			p1 = n;
402 			min = rem;
403 		}
404 	}
405 	if (!p0 || !p1)
406 		return 1;
407 
408 	param[0] = p0;
409 	param[1] = p1;
410 	param[2] = p2;
411 
412 	return 0;
413 }
414 
415 
416 /*
417  * This routine takes a user-supplied var, and picks the best vmode/cmode
418  * from it.
419  */
420 
control_var_to_par(struct fb_var_screeninfo * var,struct fb_par_control * par,const struct fb_info * fb_info)421 static int control_var_to_par(struct fb_var_screeninfo *var,
422 	struct fb_par_control *par, const struct fb_info *fb_info)
423 {
424 	int cmode, piped_diff, hstep;
425 	unsigned hperiod, hssync, hsblank, hesync, heblank, piped, heq, hlfln,
426 		 hserr, vperiod, vssync, vesync, veblank, vsblank, vswin, vewin;
427 	unsigned long pixclock;
428 	struct fb_info_control *p =
429 		container_of(fb_info, struct fb_info_control, info);
430 	struct control_regvals *r = &par->regvals;
431 
432 	switch (var->bits_per_pixel) {
433 	case 8:
434 		par->cmode = CMODE_8;
435 		if (p->total_vram > 0x200000) {
436 			r->mode = 3;
437 			r->radacal_ctrl = 0x20;
438 			piped_diff = 13;
439 		} else {
440 			r->mode = 2;
441 			r->radacal_ctrl = 0x10;
442 			piped_diff = 9;
443 		}
444 		break;
445 	case 15:
446 	case 16:
447 		par->cmode = CMODE_16;
448 		if (p->total_vram > 0x200000) {
449 			r->mode = 2;
450 			r->radacal_ctrl = 0x24;
451 			piped_diff = 5;
452 		} else {
453 			r->mode = 1;
454 			r->radacal_ctrl = 0x14;
455 			piped_diff = 3;
456 		}
457 		break;
458 	case 32:
459 		par->cmode = CMODE_32;
460 		if (p->total_vram > 0x200000) {
461 			r->mode = 1;
462 			r->radacal_ctrl = 0x28;
463 		} else {
464 			r->mode = 0;
465 			r->radacal_ctrl = 0x18;
466 		}
467 		piped_diff = 1;
468 		break;
469 	default:
470 		return -EINVAL;
471 	}
472 
473 	/*
474 	 * adjust xres and vxres so that the corresponding memory widths are
475 	 * 32-byte aligned
476 	 */
477 	hstep = 31 >> par->cmode;
478 	par->xres = (var->xres + hstep) & ~hstep;
479 	par->vxres = (var->xres_virtual + hstep) & ~hstep;
480 	par->xoffset = (var->xoffset + hstep) & ~hstep;
481 	if (par->vxres < par->xres)
482 		par->vxres = par->xres;
483 	par->pitch = par->vxres << par->cmode;
484 
485 	par->yres = var->yres;
486 	par->vyres = var->yres_virtual;
487 	par->yoffset = var->yoffset;
488 	if (par->vyres < par->yres)
489 		par->vyres = par->yres;
490 
491 	par->sync = var->sync;
492 
493 	if (par->pitch * par->vyres + CTRLFB_OFF > p->total_vram)
494 		return -EINVAL;
495 
496 	if (par->xoffset + par->xres > par->vxres)
497 		par->xoffset = par->vxres - par->xres;
498 	if (par->yoffset + par->yres > par->vyres)
499 		par->yoffset = par->vyres - par->yres;
500 
501 	pixclock = (var->pixclock < CONTROL_PIXCLOCK_MIN)? CONTROL_PIXCLOCK_MIN:
502 		   var->pixclock;
503 	if (calc_clock_params(pixclock, r->clock_params))
504 		return -EINVAL;
505 
506 	hperiod = ((var->left_margin + par->xres + var->right_margin
507 		    + var->hsync_len) >> 1) - 2;
508 	hssync = hperiod + 1;
509 	hsblank = hssync - (var->right_margin >> 1);
510 	hesync = (var->hsync_len >> 1) - 1;
511 	heblank = (var->left_margin >> 1) + hesync;
512 	piped = heblank - piped_diff;
513 	heq = var->hsync_len >> 2;
514 	hlfln = (hperiod+2) >> 1;
515 	hserr = hssync-hesync;
516 	vperiod = (var->vsync_len + var->lower_margin + par->yres
517 		   + var->upper_margin) << 1;
518 	vssync = vperiod - 2;
519 	vesync = (var->vsync_len << 1) - vperiod + vssync;
520 	veblank = (var->upper_margin << 1) + vesync;
521 	vsblank = vssync - (var->lower_margin << 1);
522 	vswin = (vsblank+vssync) >> 1;
523 	vewin = (vesync+veblank) >> 1;
524 
525 	r->regs[0] = vswin;
526 	r->regs[1] = vsblank;
527 	r->regs[2] = veblank;
528 	r->regs[3] = vewin;
529 	r->regs[4] = vesync;
530 	r->regs[5] = vssync;
531 	r->regs[6] = vperiod;
532 	r->regs[7] = piped;
533 	r->regs[8] = hperiod;
534 	r->regs[9] = hsblank;
535 	r->regs[10] = heblank;
536 	r->regs[11] = hesync;
537 	r->regs[12] = hssync;
538 	r->regs[13] = heq;
539 	r->regs[14] = hlfln;
540 	r->regs[15] = hserr;
541 
542 	if (par->xres >= 1280 && par->cmode >= CMODE_16)
543 		par->ctrl = 0x7f;
544 	else
545 		par->ctrl = 0x3b;
546 
547 	if (mac_var_to_vmode(var, &par->vmode, &cmode))
548 		par->vmode = 0;
549 
550 	return 0;
551 }
552 
553 
554 /*
555  * Convert hardware data in par to an fb_var_screeninfo
556  */
557 
control_par_to_var(struct fb_par_control * par,struct fb_var_screeninfo * var)558 static void control_par_to_var(struct fb_par_control *par, struct fb_var_screeninfo *var)
559 {
560 	struct control_regints *rv;
561 
562 	rv = (struct control_regints *) par->regvals.regs;
563 
564 	memset(var, 0, sizeof(*var));
565 	var->xres = par->xres;
566 	var->yres = par->yres;
567 	var->xres_virtual = par->vxres;
568 	var->yres_virtual = par->vyres;
569 	var->xoffset = par->xoffset;
570 	var->yoffset = par->yoffset;
571 
572 	switch(par->cmode) {
573 	default:
574 	case CMODE_8:
575 		var->bits_per_pixel = 8;
576 		var->red.length = 8;
577 		var->green.length = 8;
578 		var->blue.length = 8;
579 		break;
580 	case CMODE_16:	/* RGB 555 */
581 		var->bits_per_pixel = 16;
582 		var->red.offset = 10;
583 		var->red.length = 5;
584 		var->green.offset = 5;
585 		var->green.length = 5;
586 		var->blue.length = 5;
587 		break;
588 	case CMODE_32:	/* RGB 888 */
589 		var->bits_per_pixel = 32;
590 		var->red.offset = 16;
591 		var->red.length = 8;
592 		var->green.offset = 8;
593 		var->green.length = 8;
594 		var->blue.length = 8;
595 		var->transp.offset = 24;
596 		var->transp.length = 8;
597 		break;
598 	}
599 	var->height = -1;
600 	var->width = -1;
601 	var->vmode = FB_VMODE_NONINTERLACED;
602 
603 	var->left_margin = (rv->heblank - rv->hesync) << 1;
604 	var->right_margin = (rv->hssync - rv->hsblank) << 1;
605 	var->hsync_len = (rv->hperiod + 2 - rv->hssync + rv->hesync) << 1;
606 
607 	var->upper_margin = (rv->veblank - rv->vesync) >> 1;
608 	var->lower_margin = (rv->vssync - rv->vsblank) >> 1;
609 	var->vsync_len = (rv->vperiod - rv->vssync + rv->vesync) >> 1;
610 
611 	var->sync = par->sync;
612 
613 	/*
614 	 * 10^12 * clock_params[0] / (3906400 * clock_params[1]
615 	 *			      * 2^clock_params[2])
616 	 * (10^12 * clock_params[0] / (3906400 * clock_params[1]))
617 	 * >> clock_params[2]
618 	 */
619 	/* (255990.17 * clock_params[0] / clock_params[1]) >> clock_params[2] */
620 	var->pixclock = CONTROL_PIXCLOCK_BASE * par->regvals.clock_params[0];
621 	var->pixclock /= par->regvals.clock_params[1];
622 	var->pixclock >>= par->regvals.clock_params[2];
623 }
624 
625 /********************  The functions for controlfb_ops ********************/
626 
627 /*
628  * Checks a var structure
629  */
controlfb_check_var(struct fb_var_screeninfo * var,struct fb_info * info)630 static int controlfb_check_var (struct fb_var_screeninfo *var, struct fb_info *info)
631 {
632 	struct fb_par_control par;
633 	int err;
634 
635 	err = control_var_to_par(var, &par, info);
636 	if (err)
637 		return err;
638 	control_par_to_var(&par, var);
639 
640 	return 0;
641 }
642 
643 /*
644  * Applies current var to display
645  */
controlfb_set_par(struct fb_info * info)646 static int controlfb_set_par (struct fb_info *info)
647 {
648 	struct fb_info_control *p =
649 		container_of(info, struct fb_info_control, info);
650 	struct fb_par_control par;
651 	int err;
652 
653 	if((err = control_var_to_par(&info->var, &par, info))) {
654 		printk (KERN_ERR "controlfb_set_par: error calling"
655 				 " control_var_to_par: %d.\n", err);
656 		return err;
657 	}
658 
659 	control_set_hardware(p, &par);
660 
661 	info->fix.visual = (p->par.cmode == CMODE_8) ?
662 		FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_DIRECTCOLOR;
663 	info->fix.line_length = p->par.pitch;
664 	info->fix.xpanstep = 32 >> p->par.cmode;
665 	info->fix.ypanstep = 1;
666 
667 	return 0;
668 }
669 
controlfb_pan_display(struct fb_var_screeninfo * var,struct fb_info * info)670 static int controlfb_pan_display(struct fb_var_screeninfo *var,
671 				 struct fb_info *info)
672 {
673 	unsigned int xoffset, hstep;
674 	struct fb_info_control *p =
675 		container_of(info, struct fb_info_control, info);
676 	struct fb_par_control *par = &p->par;
677 
678 	/*
679 	 * make sure start addr will be 32-byte aligned
680 	 */
681 	hstep = 0x1f >> par->cmode;
682 	xoffset = (var->xoffset + hstep) & ~hstep;
683 
684 	if (xoffset+par->xres > par->vxres ||
685 	    var->yoffset+par->yres > par->vyres)
686 		return -EINVAL;
687 
688 	set_screen_start(xoffset, var->yoffset, p);
689 
690 	return 0;
691 }
692 
controlfb_blank(int blank_mode,struct fb_info * info)693 static int controlfb_blank(int blank_mode, struct fb_info *info)
694 {
695 	struct fb_info_control __maybe_unused *p =
696 		container_of(info, struct fb_info_control, info);
697 	unsigned ctrl;
698 
699 	ctrl = in_le32(CNTRL_REG(p, ctrl));
700 	if (blank_mode > 0)
701 		switch (blank_mode) {
702 		case FB_BLANK_VSYNC_SUSPEND:
703 			ctrl &= ~3;
704 			break;
705 		case FB_BLANK_HSYNC_SUSPEND:
706 			ctrl &= ~0x30;
707 			break;
708 		case FB_BLANK_POWERDOWN:
709 			ctrl &= ~0x33;
710 			fallthrough;
711 		case FB_BLANK_NORMAL:
712 			ctrl |= 0x400;
713 			break;
714 		default:
715 			break;
716 		}
717 	else {
718 		ctrl &= ~0x400;
719 		ctrl |= 0x33;
720 	}
721 	out_le32(CNTRL_REG(p,ctrl), ctrl);
722 
723 	return 0;
724 }
725 
726 /*
727  * Private mmap since we want to have a different caching on the framebuffer
728  * for controlfb.
729  * Note there's no locking in here; it's done in fb_mmap() in fbmem.c.
730  */
controlfb_mmap(struct fb_info * info,struct vm_area_struct * vma)731 static int controlfb_mmap(struct fb_info *info,
732                        struct vm_area_struct *vma)
733 {
734 	unsigned long mmio_pgoff;
735 	unsigned long start;
736 	u32 len;
737 
738 	start = info->fix.smem_start;
739 	len = info->fix.smem_len;
740 	mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT;
741 	if (vma->vm_pgoff >= mmio_pgoff) {
742 		if (info->var.accel_flags)
743 			return -EINVAL;
744 		vma->vm_pgoff -= mmio_pgoff;
745 		start = info->fix.mmio_start;
746 		len = info->fix.mmio_len;
747 		vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
748 	} else {
749 		/* framebuffer */
750 		vma->vm_page_prot = pgprot_cached_wthru(vma->vm_page_prot);
751 	}
752 
753 	return vm_iomap_memory(vma, start, len);
754 }
755 
756 static const struct fb_ops controlfb_ops = {
757 	.owner		= THIS_MODULE,
758 	.fb_check_var	= controlfb_check_var,
759 	.fb_set_par	= controlfb_set_par,
760 	.fb_setcolreg	= controlfb_setcolreg,
761 	.fb_pan_display = controlfb_pan_display,
762 	.fb_blank	= controlfb_blank,
763 	.fb_mmap	= controlfb_mmap,
764 	.fb_fillrect	= cfb_fillrect,
765 	.fb_copyarea	= cfb_copyarea,
766 	.fb_imageblit	= cfb_imageblit,
767 };
768 
769 /*
770  * Set misc info vars for this driver
771  */
control_init_info(struct fb_info * info,struct fb_info_control * p)772 static void __init control_init_info(struct fb_info *info, struct fb_info_control *p)
773 {
774 	/* Fill fb_info */
775 	info->par = &p->par;
776 	info->fbops = &controlfb_ops;
777 	info->pseudo_palette = p->pseudo_palette;
778 	info->flags = FBINFO_HWACCEL_YPAN;
779 	info->screen_base = p->frame_buffer + CTRLFB_OFF;
780 
781 	fb_alloc_cmap(&info->cmap, 256, 0);
782 
783 	/* Fill fix common fields */
784 	strcpy(info->fix.id, "control");
785 	info->fix.mmio_start = p->control_regs_phys;
786 	info->fix.mmio_len = sizeof(struct control_regs);
787 	info->fix.type = FB_TYPE_PACKED_PIXELS;
788 	info->fix.smem_start = p->frame_buffer_phys + CTRLFB_OFF;
789 	info->fix.smem_len = p->total_vram - CTRLFB_OFF;
790         info->fix.ywrapstep = 0;
791         info->fix.type_aux = 0;
792         info->fix.accel = FB_ACCEL_NONE;
793 }
794 
795 /*
796  * Parse user specified options (`video=controlfb:')
797  */
control_setup(char * options)798 static void __init control_setup(char *options)
799 {
800 	char *this_opt;
801 
802 	if (!options || !*options)
803 		return;
804 
805 	while ((this_opt = strsep(&options, ",")) != NULL) {
806 		if (!strncmp(this_opt, "vmode:", 6)) {
807 			int vmode = simple_strtoul(this_opt+6, NULL, 0);
808 			if (vmode > 0 && vmode <= VMODE_MAX &&
809 			    control_mac_modes[vmode - 1].m[1] >= 0)
810 				default_vmode = vmode;
811 		} else if (!strncmp(this_opt, "cmode:", 6)) {
812 			int depth = simple_strtoul(this_opt+6, NULL, 0);
813 			switch (depth) {
814 			 case CMODE_8:
815 			 case CMODE_16:
816 			 case CMODE_32:
817 			 	default_cmode = depth;
818 			 	break;
819 			 case 8:
820 				default_cmode = CMODE_8;
821 				break;
822 			 case 15:
823 			 case 16:
824 				default_cmode = CMODE_16;
825 				break;
826 			 case 24:
827 			 case 32:
828 				default_cmode = CMODE_32;
829 				break;
830 			}
831 		}
832 	}
833 }
834 
835 /*
836  * finish off the driver initialization and register
837  */
init_control(struct fb_info_control * p)838 static int __init init_control(struct fb_info_control *p)
839 {
840 	int full, sense, vmode, cmode, vyres;
841 	struct fb_var_screeninfo var;
842 	int rc;
843 
844 	printk(KERN_INFO "controlfb: ");
845 
846 	full = p->total_vram == 0x400000;
847 
848 	/* Try to pick a video mode out of NVRAM if we have one. */
849 	cmode = default_cmode;
850 	if (IS_REACHABLE(CONFIG_NVRAM) && cmode == CMODE_NVRAM)
851 		cmode = nvram_read_byte(NV_CMODE);
852 	if (cmode < CMODE_8 || cmode > CMODE_32)
853 		cmode = CMODE_8;
854 
855 	vmode = default_vmode;
856 	if (IS_REACHABLE(CONFIG_NVRAM) && vmode == VMODE_NVRAM)
857 		vmode = nvram_read_byte(NV_VMODE);
858 	if (vmode < 1 || vmode > VMODE_MAX ||
859 	    control_mac_modes[vmode - 1].m[full] < cmode) {
860 		sense = read_control_sense(p);
861 		printk(KERN_CONT "Monitor sense value = 0x%x, ", sense);
862 		vmode = mac_map_monitor_sense(sense);
863 		if (control_mac_modes[vmode - 1].m[full] < 0)
864 			vmode = VMODE_640_480_60;
865 		cmode = min(cmode, control_mac_modes[vmode - 1].m[full]);
866 	}
867 
868 	/* Initialize info structure */
869 	control_init_info(&p->info, p);
870 
871 	/* Setup default var */
872 	if (mac_vmode_to_var(vmode, cmode, &var) < 0) {
873 		/* This shouldn't happen! */
874 		printk("mac_vmode_to_var(%d, %d,) failed\n", vmode, cmode);
875 try_again:
876 		vmode = VMODE_640_480_60;
877 		cmode = CMODE_8;
878 		if (mac_vmode_to_var(vmode, cmode, &var) < 0) {
879 			printk(KERN_ERR "controlfb: mac_vmode_to_var() failed\n");
880 			return -ENXIO;
881 		}
882 		printk(KERN_INFO "controlfb: ");
883 	}
884 	printk("using video mode %d and color mode %d.\n", vmode, cmode);
885 
886 	vyres = (p->total_vram - CTRLFB_OFF) / (var.xres << cmode);
887 	if (vyres > var.yres)
888 		var.yres_virtual = vyres;
889 
890 	/* Apply default var */
891 	var.activate = FB_ACTIVATE_NOW;
892 	rc = fb_set_var(&p->info, &var);
893 	if (rc && (vmode != VMODE_640_480_60 || cmode != CMODE_8))
894 		goto try_again;
895 
896 	/* Register with fbdev layer */
897 	if (register_framebuffer(&p->info) < 0)
898 		return -ENXIO;
899 
900 	fb_info(&p->info, "control display adapter\n");
901 
902 	return 0;
903 }
904 
control_cleanup(void)905 static void control_cleanup(void)
906 {
907 	struct fb_info_control	*p = control_fb;
908 
909 	if (!p)
910 		return;
911 
912 	if (p->cmap_regs)
913 		iounmap(p->cmap_regs);
914 	if (p->control_regs)
915 		iounmap(p->control_regs);
916 	if (p->frame_buffer) {
917 		if (p->control_use_bank2)
918 			p->frame_buffer -= 0x600000;
919 		iounmap(p->frame_buffer);
920 	}
921 	if (p->cmap_regs_phys)
922 		release_mem_region(p->cmap_regs_phys, 0x1000);
923 	if (p->control_regs_phys)
924 		release_mem_region(p->control_regs_phys, p->control_regs_size);
925 	if (p->fb_orig_base)
926 		release_mem_region(p->fb_orig_base, p->fb_orig_size);
927 	kfree(p);
928 }
929 
930 /*
931  * find "control" and initialize
932  */
control_of_init(struct device_node * dp)933 static int __init control_of_init(struct device_node *dp)
934 {
935 	struct fb_info_control	*p;
936 	struct resource		fb_res, reg_res;
937 
938 	if (control_fb) {
939 		printk(KERN_ERR "controlfb: only one control is supported\n");
940 		return -ENXIO;
941 	}
942 
943 	if (of_pci_address_to_resource(dp, 2, &fb_res) ||
944 	    of_pci_address_to_resource(dp, 1, &reg_res)) {
945 		printk(KERN_ERR "can't get 2 addresses for control\n");
946 		return -ENXIO;
947 	}
948 	p = kzalloc(sizeof(*p), GFP_KERNEL);
949 	if (!p)
950 		return -ENOMEM;
951 	control_fb = p;	/* save it for cleanups */
952 
953 	/* Map in frame buffer and registers */
954 	p->fb_orig_base = fb_res.start;
955 	p->fb_orig_size = resource_size(&fb_res);
956 	/* use the big-endian aperture (??) */
957 	p->frame_buffer_phys = fb_res.start + 0x800000;
958 	p->control_regs_phys = reg_res.start;
959 	p->control_regs_size = resource_size(&reg_res);
960 
961 	if (!p->fb_orig_base ||
962 	    !request_mem_region(p->fb_orig_base,p->fb_orig_size,"controlfb")) {
963 		p->fb_orig_base = 0;
964 		goto error_out;
965 	}
966 	/* map at most 8MB for the frame buffer */
967 	p->frame_buffer = ioremap_wt(p->frame_buffer_phys, 0x800000);
968 
969 	if (!p->control_regs_phys ||
970 	    !request_mem_region(p->control_regs_phys, p->control_regs_size,
971 	    "controlfb regs")) {
972 		p->control_regs_phys = 0;
973 		goto error_out;
974 	}
975 	p->control_regs = ioremap(p->control_regs_phys, p->control_regs_size);
976 
977 	p->cmap_regs_phys = 0xf301b000;	 /* XXX not in prom? */
978 	if (!request_mem_region(p->cmap_regs_phys, 0x1000, "controlfb cmap")) {
979 		p->cmap_regs_phys = 0;
980 		goto error_out;
981 	}
982 	p->cmap_regs = ioremap(p->cmap_regs_phys, 0x1000);
983 
984 	if (!p->cmap_regs || !p->control_regs || !p->frame_buffer)
985 		goto error_out;
986 
987 	find_vram_size(p);
988 	if (!p->total_vram)
989 		goto error_out;
990 
991 	if (init_control(p) < 0)
992 		goto error_out;
993 
994 	return 0;
995 
996 error_out:
997 	control_cleanup();
998 	return -ENXIO;
999 }
1000 
control_init(void)1001 static int __init control_init(void)
1002 {
1003 	struct device_node *dp;
1004 	char *option = NULL;
1005 	int ret = -ENXIO;
1006 
1007 	if (fb_get_options("controlfb", &option))
1008 		return -ENODEV;
1009 	control_setup(option);
1010 
1011 	dp = of_find_node_by_name(NULL, "control");
1012 	if (dp && !control_of_init(dp))
1013 		ret = 0;
1014 	of_node_put(dp);
1015 
1016 	return ret;
1017 }
1018 
1019 device_initcall(control_init);
1020