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1/*
2 * valkyriefb.c -- frame buffer device for the PowerMac 'valkyrie' display
3 *
4 * Created 8 August 1998 by
5 * Martin Costabel <[email protected]> and Kevin Schoedel
6 *
7 * Vmode-switching changes and vmode 15/17 modifications created 29 August
8 * 1998 by Barry K. Nathan <[email protected]>.
9 *
10 * Ported to m68k Macintosh by David Huggins-Daines <[email protected]>
11 *
12 * Derived directly from:
13 *
14 * controlfb.c -- frame buffer device for the PowerMac 'control' display
15 * Copyright (C) 1998 Dan Jacobowitz <[email protected]>
16 *
17 * pmc-valkyrie.c -- Console support for PowerMac "valkyrie" display adaptor.
18 * Copyright (C) 1997 Paul Mackerras.
19 *
20 * and indirectly:
21 *
22 * Frame buffer structure from:
23 * drivers/video/chipsfb.c -- frame buffer device for
24 * Chips & Technologies 65550 chip.
25 *
26 * Copyright (C) 1998 Paul Mackerras
27 *
28 * This file is derived from the Powermac "chips" driver:
29 * Copyright (C) 1997 Fabio Riccardi.
30 * And from the frame buffer device for Open Firmware-initialized devices:
31 * Copyright (C) 1997 Geert Uytterhoeven.
32 *
33 * Hardware information from:
34 * control.c: Console support for PowerMac "control" display adaptor.
35 * Copyright (C) 1996 Paul Mackerras
36 *
37 * This file is subject to the terms and conditions of the GNU General Public
38 * License. See the file COPYING in the main directory of this archive for
39 * more details.
40 */
41
42#include <linux/module.h>
43#include <linux/kernel.h>
44#include <linux/errno.h>
45#include <linux/string.h>
46#include <linux/mm.h>
47#include <linux/slab.h>
48#include <linux/vmalloc.h>
49#include <linux/delay.h>
50#include <linux/interrupt.h>
51#include <linux/fb.h>
52#include <linux/selection.h>
53#include <linux/init.h>
54#include <linux/nvram.h>
55#include <linux/adb.h>
56#include <linux/cuda.h>
57#include <linux/of_address.h>
58#ifdef CONFIG_MAC
59#include <asm/macintosh.h>
60#endif
61
62#include "macmodes.h"
63#include "valkyriefb.h"
64
65static int default_vmode = VMODE_NVRAM;
66static int default_cmode = CMODE_NVRAM;
67
68struct fb_par_valkyrie {
69 int vmode, cmode;
70 int xres, yres;
71 int vxres, vyres;
72 struct valkyrie_regvals *init;
73};
74
75struct fb_info_valkyrie {
76 struct fb_info info;
77 struct fb_par_valkyrie par;
78 struct cmap_regs __iomem *cmap_regs;
79 unsigned long cmap_regs_phys;
80
81 struct valkyrie_regs __iomem *valkyrie_regs;
82 unsigned long valkyrie_regs_phys;
83
84 __u8 __iomem *frame_buffer;
85 unsigned long frame_buffer_phys;
86
87 int sense;
88 unsigned long total_vram;
89
90 u32 pseudo_palette[16];
91};
92
93static int valkyriefb_setup(char*);
94
95static int valkyriefb_check_var(struct fb_var_screeninfo *var,
96 struct fb_info *info);
97static int valkyriefb_set_par(struct fb_info *info);
98static int valkyriefb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
99 u_int transp, struct fb_info *info);
100static int valkyriefb_blank(int blank_mode, struct fb_info *info);
101
102static int read_valkyrie_sense(struct fb_info_valkyrie *p);
103static void set_valkyrie_clock(unsigned char *params);
104static int valkyrie_var_to_par(struct fb_var_screeninfo *var,
105 struct fb_par_valkyrie *par, const struct fb_info *fb_info);
106
107static int valkyrie_init_info(struct fb_info *info, struct fb_info_valkyrie *p);
108static void valkyrie_par_to_fix(struct fb_par_valkyrie *par, struct fb_fix_screeninfo *fix);
109static void valkyrie_init_fix(struct fb_fix_screeninfo *fix, struct fb_info_valkyrie *p);
110
111static const struct fb_ops valkyriefb_ops = {
112 .owner = THIS_MODULE,
113 FB_DEFAULT_IOMEM_OPS,
114 .fb_check_var = valkyriefb_check_var,
115 .fb_set_par = valkyriefb_set_par,
116 .fb_setcolreg = valkyriefb_setcolreg,
117 .fb_blank = valkyriefb_blank,
118};
119
120/* Sets the video mode according to info->var */
121static int valkyriefb_set_par(struct fb_info *info)
122{
123 struct fb_info_valkyrie *p =
124 container_of(info, struct fb_info_valkyrie, info);
125 volatile struct valkyrie_regs __iomem *valkyrie_regs = p->valkyrie_regs;
126 struct fb_par_valkyrie *par = info->par;
127 struct valkyrie_regvals *init;
128 int err;
129
130 if ((err = valkyrie_var_to_par(&info->var, par, info)))
131 return err;
132
133 valkyrie_par_to_fix(par, &info->fix);
134
135 /* Reset the valkyrie */
136 out_8(&valkyrie_regs->status.r, 0);
137 udelay(100);
138
139 /* Initialize display timing registers */
140 init = par->init;
141 out_8(&valkyrie_regs->mode.r, init->mode | 0x80);
142 out_8(&valkyrie_regs->depth.r, par->cmode + 3);
143 set_valkyrie_clock(init->clock_params);
144 udelay(100);
145
146 /* Turn on display */
147 out_8(&valkyrie_regs->mode.r, init->mode);
148
149 return 0;
150}
151
152static inline int valkyrie_par_to_var(struct fb_par_valkyrie *par,
153 struct fb_var_screeninfo *var)
154{
155 return mac_vmode_to_var(par->vmode, par->cmode, var);
156}
157
158static int
159valkyriefb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
160{
161 int err;
162 struct fb_par_valkyrie par;
163
164 if ((err = valkyrie_var_to_par(var, &par, info)))
165 return err;
166 valkyrie_par_to_var(&par, var);
167 return 0;
168}
169
170/*
171 * Blank the screen if blank_mode != 0, else unblank. If blank_mode == NULL
172 * then the caller blanks by setting the CLUT (Color Look Up Table) to all
173 * black. Return 0 if blanking succeeded, != 0 if un-/blanking failed due
174 * to e.g. a video mode which doesn't support it. Implements VESA suspend
175 * and powerdown modes on hardware that supports disabling hsync/vsync:
176 * blank_mode == 2: suspend vsync
177 * blank_mode == 3: suspend hsync
178 * blank_mode == 4: powerdown
179 */
180static int valkyriefb_blank(int blank_mode, struct fb_info *info)
181{
182 struct fb_info_valkyrie *p =
183 container_of(info, struct fb_info_valkyrie, info);
184 struct fb_par_valkyrie *par = info->par;
185 struct valkyrie_regvals *init = par->init;
186
187 if (init == NULL)
188 return 1;
189
190 switch (blank_mode) {
191 case FB_BLANK_UNBLANK: /* unblank */
192 out_8(&p->valkyrie_regs->mode.r, init->mode);
193 break;
194 case FB_BLANK_NORMAL:
195 return 1; /* get caller to set CLUT to all black */
196 case FB_BLANK_VSYNC_SUSPEND:
197 case FB_BLANK_HSYNC_SUSPEND:
198 /*
199 * [kps] Value extracted from MacOS. I don't know
200 * whether this bit disables hsync or vsync, or
201 * whether the hardware can do the other as well.
202 */
203 out_8(&p->valkyrie_regs->mode.r, init->mode | 0x40);
204 break;
205 case FB_BLANK_POWERDOWN:
206 out_8(&p->valkyrie_regs->mode.r, 0x66);
207 break;
208 }
209 return 0;
210}
211
212static int valkyriefb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
213 u_int transp, struct fb_info *info)
214{
215 struct fb_info_valkyrie *p =
216 container_of(info, struct fb_info_valkyrie, info);
217 volatile struct cmap_regs __iomem *cmap_regs = p->cmap_regs;
218 struct fb_par_valkyrie *par = info->par;
219
220 if (regno > 255)
221 return 1;
222 red >>= 8;
223 green >>= 8;
224 blue >>= 8;
225
226 /* tell clut which address to fill */
227 out_8(&p->cmap_regs->addr, regno);
228 udelay(1);
229 /* send one color channel at a time */
230 out_8(&cmap_regs->lut, red);
231 out_8(&cmap_regs->lut, green);
232 out_8(&cmap_regs->lut, blue);
233
234 if (regno < 16 && par->cmode == CMODE_16)
235 ((u32 *)info->pseudo_palette)[regno] =
236 (regno << 10) | (regno << 5) | regno;
237
238 return 0;
239}
240
241static inline int valkyrie_vram_reqd(int video_mode, int color_mode)
242{
243 int pitch;
244 struct valkyrie_regvals *init = valkyrie_reg_init[video_mode-1];
245
246 if ((pitch = init->pitch[color_mode]) == 0)
247 pitch = 2 * init->pitch[0];
248 return init->vres * pitch;
249}
250
251static void set_valkyrie_clock(unsigned char *params)
252{
253#ifdef CONFIG_ADB_CUDA
254 struct adb_request req;
255 int i;
256
257 for (i = 0; i < 3; ++i) {
258 cuda_request(&req, NULL, 5, CUDA_PACKET, CUDA_GET_SET_IIC,
259 0x50, i + 1, params[i]);
260 while (!req.complete)
261 cuda_poll();
262 }
263#endif
264}
265
266static void __init valkyrie_choose_mode(struct fb_info_valkyrie *p)
267{
268 p->sense = read_valkyrie_sense(p);
269 printk(KERN_INFO "Monitor sense value = 0x%x\n", p->sense);
270
271 /* Try to pick a video mode out of NVRAM if we have one. */
272#ifdef CONFIG_PPC_PMAC
273 if (IS_REACHABLE(CONFIG_NVRAM) && default_vmode == VMODE_NVRAM)
274 default_vmode = nvram_read_byte(NV_VMODE);
275#endif
276 if (default_vmode <= 0 || default_vmode > VMODE_MAX ||
277 !valkyrie_reg_init[default_vmode - 1]) {
278 default_vmode = mac_map_monitor_sense(p->sense);
279 if (!valkyrie_reg_init[default_vmode - 1])
280 default_vmode = VMODE_640_480_67;
281 }
282
283#ifdef CONFIG_PPC_PMAC
284 if (IS_REACHABLE(CONFIG_NVRAM) && default_cmode == CMODE_NVRAM)
285 default_cmode = nvram_read_byte(NV_CMODE);
286#endif
287 /*
288 * Reduce the pixel size if we don't have enough VRAM or bandwidth.
289 */
290 if (default_cmode < CMODE_8 || default_cmode > CMODE_16
291 || valkyrie_reg_init[default_vmode-1]->pitch[default_cmode] == 0
292 || valkyrie_vram_reqd(default_vmode, default_cmode) > p->total_vram)
293 default_cmode = CMODE_8;
294
295 printk(KERN_INFO "using video mode %d and color mode %d.\n",
296 default_vmode, default_cmode);
297}
298
299static int __init valkyriefb_init(void)
300{
301 struct fb_info_valkyrie *p;
302 unsigned long frame_buffer_phys, cmap_regs_phys;
303 int err;
304 char *option = NULL;
305
306 if (fb_get_options("valkyriefb", &option))
307 return -ENODEV;
308 valkyriefb_setup(option);
309
310#ifdef CONFIG_MAC
311 if (!MACH_IS_MAC)
312 return -ENODEV;
313 if (!(mac_bi_data.id == MAC_MODEL_Q630
314 /* I'm not sure about this one */
315 || mac_bi_data.id == MAC_MODEL_P588))
316 return -ENODEV;
317
318 /* Hardcoded addresses... welcome to 68k Macintosh country :-) */
319 frame_buffer_phys = 0xf9000000;
320 cmap_regs_phys = 0x50f24000;
321#else /* ppc (!CONFIG_MAC) */
322 {
323 struct device_node *dp;
324 struct resource r;
325
326 dp = of_find_node_by_name(NULL, "valkyrie");
327 if (!dp)
328 return 0;
329
330 if (of_address_to_resource(dp, 0, &r)) {
331 printk(KERN_ERR "can't find address for valkyrie\n");
332 of_node_put(dp);
333 return 0;
334 }
335
336 frame_buffer_phys = r.start;
337 cmap_regs_phys = r.start + 0x304000;
338 of_node_put(dp);
339 }
340#endif /* ppc (!CONFIG_MAC) */
341
342 p = kzalloc_obj(*p, GFP_ATOMIC);
343 if (!p)
344 return -ENOMEM;
345
346 /* Map in frame buffer and registers */
347 if (!request_mem_region(frame_buffer_phys, 0x100000, "valkyriefb")) {
348 kfree(p);
349 return 0;
350 }
351 p->total_vram = 0x100000;
352 p->frame_buffer_phys = frame_buffer_phys;
353#ifdef CONFIG_MAC
354 p->frame_buffer = ioremap(frame_buffer_phys, p->total_vram);
355#else
356 p->frame_buffer = ioremap_wt(frame_buffer_phys, p->total_vram);
357#endif
358 p->cmap_regs_phys = cmap_regs_phys;
359 p->cmap_regs = ioremap(p->cmap_regs_phys, 0x1000);
360 p->valkyrie_regs_phys = cmap_regs_phys+0x6000;
361 p->valkyrie_regs = ioremap(p->valkyrie_regs_phys, 0x1000);
362 err = -ENOMEM;
363 if (p->frame_buffer == NULL || p->cmap_regs == NULL
364 || p->valkyrie_regs == NULL) {
365 printk(KERN_ERR "valkyriefb: couldn't map resources\n");
366 goto out_free;
367 }
368
369 valkyrie_choose_mode(p);
370 mac_vmode_to_var(default_vmode, default_cmode, &p->info.var);
371 err = valkyrie_init_info(&p->info, p);
372 if (err < 0)
373 goto out_free;
374 valkyrie_init_fix(&p->info.fix, p);
375 if (valkyriefb_set_par(&p->info))
376 /* "can't happen" */
377 printk(KERN_ERR "valkyriefb: can't set default video mode\n");
378
379 if ((err = register_framebuffer(&p->info)) != 0)
380 goto out_cmap_free;
381
382 fb_info(&p->info, "valkyrie frame buffer device\n");
383 return 0;
384
385 out_cmap_free:
386 fb_dealloc_cmap(&p->info.cmap);
387 out_free:
388 if (p->frame_buffer)
389 iounmap(p->frame_buffer);
390 if (p->cmap_regs)
391 iounmap(p->cmap_regs);
392 if (p->valkyrie_regs)
393 iounmap(p->valkyrie_regs);
394 kfree(p);
395 return err;
396}
397
398/*
399 * Get the monitor sense value.
400 */
401static int read_valkyrie_sense(struct fb_info_valkyrie *p)
402{
403 int sense, in;
404
405 out_8(&p->valkyrie_regs->msense.r, 0); /* release all lines */
406 __delay(20000);
407 sense = ((in = in_8(&p->valkyrie_regs->msense.r)) & 0x70) << 4;
408 /* drive each sense line low in turn and collect the other 2 */
409 out_8(&p->valkyrie_regs->msense.r, 4); /* drive A low */
410 __delay(20000);
411 sense |= ((in = in_8(&p->valkyrie_regs->msense.r)) & 0x30);
412 out_8(&p->valkyrie_regs->msense.r, 2); /* drive B low */
413 __delay(20000);
414 sense |= ((in = in_8(&p->valkyrie_regs->msense.r)) & 0x40) >> 3;
415 sense |= (in & 0x10) >> 2;
416 out_8(&p->valkyrie_regs->msense.r, 1); /* drive C low */
417 __delay(20000);
418 sense |= ((in = in_8(&p->valkyrie_regs->msense.r)) & 0x60) >> 5;
419
420 out_8(&p->valkyrie_regs->msense.r, 7);
421
422 return sense;
423}
424
425/*
426 * This routine takes a user-supplied var,
427 * and picks the best vmode/cmode from it.
428 */
429
430/* [bkn] I did a major overhaul of this function.
431 *
432 * Much of the old code was "swiped by jonh from atyfb.c". Because
433 * macmodes has mac_var_to_vmode, I felt that it would be better to
434 * rework this function to use that, instead of reinventing the wheel to
435 * add support for vmode 17. This was reinforced by the fact that
436 * the previously swiped atyfb.c code is no longer there.
437 *
438 * So, I swiped and adapted platinum_var_to_par (from platinumfb.c), replacing
439 * most, but not all, of the old code in the process. One side benefit of
440 * swiping the platinumfb code is that we now have more comprehensible error
441 * messages when a vmode/cmode switch fails. (Most of the error messages are
442 * platinumfb.c, but I added two of my own, and I also changed some commas
443 * into colons to make the messages more consistent with other Linux error
444 * messages.) In addition, I think the new code *might* fix some vmode-
445 * switching oddities, but I'm not sure.
446 *
447 * There may be some more opportunities for cleanup in here, but this is a
448 * good start...
449 */
450
451static int valkyrie_var_to_par(struct fb_var_screeninfo *var,
452 struct fb_par_valkyrie *par, const struct fb_info *fb_info)
453{
454 int vmode, cmode;
455 struct valkyrie_regvals *init;
456 struct fb_info_valkyrie *p =
457 container_of(fb_info, struct fb_info_valkyrie, info);
458
459 if (mac_var_to_vmode(var, &vmode, &cmode) != 0) {
460 printk(KERN_ERR "valkyriefb: can't do %dx%dx%d.\n",
461 var->xres, var->yres, var->bits_per_pixel);
462 return -EINVAL;
463 }
464
465 /* Check if we know about the wanted video mode */
466 if (vmode < 1 || vmode > VMODE_MAX || !valkyrie_reg_init[vmode-1]) {
467 printk(KERN_ERR "valkyriefb: vmode %d not valid.\n", vmode);
468 return -EINVAL;
469 }
470
471 if (cmode != CMODE_8 && cmode != CMODE_16) {
472 printk(KERN_ERR "valkyriefb: cmode %d not valid.\n", cmode);
473 return -EINVAL;
474 }
475
476 if (var->xres_virtual > var->xres || var->yres_virtual > var->yres
477 || var->xoffset != 0 || var->yoffset != 0) {
478 return -EINVAL;
479 }
480
481 init = valkyrie_reg_init[vmode-1];
482 if (init->pitch[cmode] == 0) {
483 printk(KERN_ERR "valkyriefb: vmode %d does not support "
484 "cmode %d.\n", vmode, cmode);
485 return -EINVAL;
486 }
487
488 if (valkyrie_vram_reqd(vmode, cmode) > p->total_vram) {
489 printk(KERN_ERR "valkyriefb: not enough ram for vmode %d, "
490 "cmode %d.\n", vmode, cmode);
491 return -EINVAL;
492 }
493
494 par->vmode = vmode;
495 par->cmode = cmode;
496 par->init = init;
497 par->xres = var->xres;
498 par->yres = var->yres;
499 par->vxres = par->xres;
500 par->vyres = par->yres;
501
502 return 0;
503}
504
505static void valkyrie_init_fix(struct fb_fix_screeninfo *fix, struct fb_info_valkyrie *p)
506{
507 memset(fix, 0, sizeof(*fix));
508 strcpy(fix->id, "valkyrie");
509 fix->mmio_start = p->valkyrie_regs_phys;
510 fix->mmio_len = sizeof(struct valkyrie_regs);
511 fix->type = FB_TYPE_PACKED_PIXELS;
512 fix->smem_start = p->frame_buffer_phys + 0x1000;
513 fix->smem_len = p->total_vram;
514
515 fix->type_aux = 0;
516 fix->ywrapstep = 0;
517 fix->ypanstep = 0;
518 fix->xpanstep = 0;
519
520}
521
522/* Fix must already be inited above */
523static void valkyrie_par_to_fix(struct fb_par_valkyrie *par,
524 struct fb_fix_screeninfo *fix)
525{
526 fix->smem_len = valkyrie_vram_reqd(par->vmode, par->cmode);
527 fix->visual = (par->cmode == CMODE_8) ?
528 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_DIRECTCOLOR;
529 fix->line_length = par->vxres << par->cmode;
530 /* ywrapstep, xpanstep, ypanstep */
531}
532
533static int __init valkyrie_init_info(struct fb_info *info,
534 struct fb_info_valkyrie *p)
535{
536 info->fbops = &valkyriefb_ops;
537 info->screen_base = p->frame_buffer + 0x1000;
538 info->pseudo_palette = p->pseudo_palette;
539 info->par = &p->par;
540 return fb_alloc_cmap(&info->cmap, 256, 0);
541}
542
543
544/*
545 * Parse user specified options (`video=valkyriefb:')
546 */
547static int __init valkyriefb_setup(char *options)
548{
549 char *this_opt;
550
551 if (!options || !*options)
552 return 0;
553
554 while ((this_opt = strsep(&options, ",")) != NULL) {
555 if (!strncmp(this_opt, "vmode:", 6)) {
556 int vmode = simple_strtoul(this_opt+6, NULL, 0);
557 if (vmode > 0 && vmode <= VMODE_MAX)
558 default_vmode = vmode;
559 }
560 else if (!strncmp(this_opt, "cmode:", 6)) {
561 int depth = simple_strtoul(this_opt+6, NULL, 0);
562 switch (depth) {
563 case 8:
564 default_cmode = CMODE_8;
565 break;
566 case 15:
567 case 16:
568 default_cmode = CMODE_16;
569 break;
570 }
571 }
572 }
573 return 0;
574}
575
576module_init(valkyriefb_init);
577MODULE_LICENSE("GPL");