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Pull bugzilla-7887 into release branch
[deliverable/linux.git] / drivers / video / controlfb.c
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/module.h>
35 #include <linux/kernel.h>
36 #include <linux/errno.h>
37 #include <linux/string.h>
38 #include <linux/mm.h>
39 #include <linux/slab.h>
40 #include <linux/vmalloc.h>
41 #include <linux/delay.h>
42 #include <linux/interrupt.h>
43 #include <linux/fb.h>
44 #include <linux/init.h>
45 #include <linux/pci.h>
46 #include <linux/nvram.h>
47 #include <linux/adb.h>
48 #include <linux/cuda.h>
49 #include <asm/io.h>
50 #include <asm/prom.h>
51 #include <asm/pgtable.h>
52 #include <asm/btext.h>
53
54 #include "macmodes.h"
55 #include "controlfb.h"
56
57 struct fb_par_control {
58 int vmode, cmode;
59 int xres, yres;
60 int vxres, vyres;
61 int xoffset, yoffset;
62 int pitch;
63 struct control_regvals regvals;
64 unsigned long sync;
65 unsigned char ctrl;
66 };
67
68 #define DIRTY(z) ((x)->z != (y)->z)
69 #define DIRTY_CMAP(z) (memcmp(&((x)->z), &((y)->z), sizeof((y)->z)))
70 static inline int PAR_EQUAL(struct fb_par_control *x, struct fb_par_control *y)
71 {
72 int i, results;
73
74 results = 1;
75 for (i = 0; i < 3; i++)
76 results &= !DIRTY(regvals.clock_params[i]);
77 if (!results)
78 return 0;
79 for (i = 0; i < 16; i++)
80 results &= !DIRTY(regvals.regs[i]);
81 if (!results)
82 return 0;
83 return (!DIRTY(cmode) && !DIRTY(xres) && !DIRTY(yres)
84 && !DIRTY(vxres) && !DIRTY(vyres));
85 }
86 static inline int VAR_MATCH(struct fb_var_screeninfo *x, struct fb_var_screeninfo *y)
87 {
88 return (!DIRTY(bits_per_pixel) && !DIRTY(xres)
89 && !DIRTY(yres) && !DIRTY(xres_virtual)
90 && !DIRTY(yres_virtual)
91 && !DIRTY_CMAP(red) && !DIRTY_CMAP(green) && !DIRTY_CMAP(blue));
92 }
93
94 struct fb_info_control {
95 struct fb_info info;
96 struct fb_par_control par;
97 u32 pseudo_palette[17];
98
99 struct cmap_regs __iomem *cmap_regs;
100 unsigned long cmap_regs_phys;
101
102 struct control_regs __iomem *control_regs;
103 unsigned long control_regs_phys;
104 unsigned long control_regs_size;
105
106 __u8 __iomem *frame_buffer;
107 unsigned long frame_buffer_phys;
108 unsigned long fb_orig_base;
109 unsigned long fb_orig_size;
110
111 int control_use_bank2;
112 unsigned long total_vram;
113 unsigned char vram_attr;
114 };
115
116 /* control register access macro */
117 #define CNTRL_REG(INFO,REG) (&(((INFO)->control_regs->REG).r))
118
119
120 /******************** Prototypes for exported functions ********************/
121 /*
122 * struct fb_ops
123 */
124 static int controlfb_pan_display(struct fb_var_screeninfo *var,
125 struct fb_info *info);
126 static int controlfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
127 u_int transp, struct fb_info *info);
128 static int controlfb_blank(int blank_mode, struct fb_info *info);
129 static int controlfb_mmap(struct fb_info *info,
130 struct vm_area_struct *vma);
131 static int controlfb_set_par (struct fb_info *info);
132 static int controlfb_check_var (struct fb_var_screeninfo *var, struct fb_info *info);
133
134 /******************** Prototypes for internal functions **********************/
135
136 static void set_control_clock(unsigned char *params);
137 static int init_control(struct fb_info_control *p);
138 static void control_set_hardware(struct fb_info_control *p,
139 struct fb_par_control *par);
140 static int control_of_init(struct device_node *dp);
141 static void find_vram_size(struct fb_info_control *p);
142 static int read_control_sense(struct fb_info_control *p);
143 static int calc_clock_params(unsigned long clk, unsigned char *param);
144 static int control_var_to_par(struct fb_var_screeninfo *var,
145 struct fb_par_control *par, const struct fb_info *fb_info);
146 static inline void control_par_to_var(struct fb_par_control *par,
147 struct fb_var_screeninfo *var);
148 static void control_init_info(struct fb_info *info, struct fb_info_control *p);
149 static void control_cleanup(void);
150
151
152 /************************** Internal variables *******************************/
153
154 static struct fb_info_control *control_fb;
155
156 static int default_vmode __initdata = VMODE_NVRAM;
157 static int default_cmode __initdata = CMODE_NVRAM;
158
159
160 static struct fb_ops controlfb_ops = {
161 .owner = THIS_MODULE,
162 .fb_check_var = controlfb_check_var,
163 .fb_set_par = controlfb_set_par,
164 .fb_setcolreg = controlfb_setcolreg,
165 .fb_pan_display = controlfb_pan_display,
166 .fb_blank = controlfb_blank,
167 .fb_mmap = controlfb_mmap,
168 .fb_fillrect = cfb_fillrect,
169 .fb_copyarea = cfb_copyarea,
170 .fb_imageblit = cfb_imageblit,
171 };
172
173
174 /******************** The functions for controlfb_ops ********************/
175
176 #ifdef MODULE
177 MODULE_LICENSE("GPL");
178
179 int init_module(void)
180 {
181 struct device_node *dp;
182
183 dp = find_devices("control");
184 if (dp != 0 && !control_of_init(dp))
185 return 0;
186
187 return -ENXIO;
188 }
189
190 void cleanup_module(void)
191 {
192 control_cleanup();
193 }
194 #endif
195
196 /*
197 * Checks a var structure
198 */
199 static int controlfb_check_var (struct fb_var_screeninfo *var, struct fb_info *info)
200 {
201 struct fb_par_control par;
202 int err;
203
204 err = control_var_to_par(var, &par, info);
205 if (err)
206 return err;
207 control_par_to_var(&par, var);
208
209 return 0;
210 }
211
212 /*
213 * Applies current var to display
214 */
215 static int controlfb_set_par (struct fb_info *info)
216 {
217 struct fb_info_control *p = (struct fb_info_control *) info;
218 struct fb_par_control par;
219 int err;
220
221 if((err = control_var_to_par(&info->var, &par, info))) {
222 printk (KERN_ERR "controlfb_set_par: error calling"
223 " control_var_to_par: %d.\n", err);
224 return err;
225 }
226
227 control_set_hardware(p, &par);
228
229 info->fix.visual = (p->par.cmode == CMODE_8) ?
230 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_DIRECTCOLOR;
231 info->fix.line_length = p->par.pitch;
232 info->fix.xpanstep = 32 >> p->par.cmode;
233 info->fix.ypanstep = 1;
234
235 return 0;
236 }
237
238 /*
239 * Set screen start address according to var offset values
240 */
241 static inline void set_screen_start(int xoffset, int yoffset,
242 struct fb_info_control *p)
243 {
244 struct fb_par_control *par = &p->par;
245
246 par->xoffset = xoffset;
247 par->yoffset = yoffset;
248 out_le32(CNTRL_REG(p,start_addr),
249 par->yoffset * par->pitch + (par->xoffset << par->cmode));
250 }
251
252
253 static int controlfb_pan_display(struct fb_var_screeninfo *var,
254 struct fb_info *info)
255 {
256 unsigned int xoffset, hstep;
257 struct fb_info_control *p = (struct fb_info_control *)info;
258 struct fb_par_control *par = &p->par;
259
260 /*
261 * make sure start addr will be 32-byte aligned
262 */
263 hstep = 0x1f >> par->cmode;
264 xoffset = (var->xoffset + hstep) & ~hstep;
265
266 if (xoffset+par->xres > par->vxres ||
267 var->yoffset+par->yres > par->vyres)
268 return -EINVAL;
269
270 set_screen_start(xoffset, var->yoffset, p);
271
272 return 0;
273 }
274
275
276 /*
277 * Private mmap since we want to have a different caching on the framebuffer
278 * for controlfb.
279 * Note there's no locking in here; it's done in fb_mmap() in fbmem.c.
280 */
281 static int controlfb_mmap(struct fb_info *info,
282 struct vm_area_struct *vma)
283 {
284 unsigned long off, start;
285 u32 len;
286
287 off = vma->vm_pgoff << PAGE_SHIFT;
288
289 /* frame buffer memory */
290 start = info->fix.smem_start;
291 len = PAGE_ALIGN((start & ~PAGE_MASK)+info->fix.smem_len);
292 if (off >= len) {
293 /* memory mapped io */
294 off -= len;
295 if (info->var.accel_flags)
296 return -EINVAL;
297 start = info->fix.mmio_start;
298 len = PAGE_ALIGN((start & ~PAGE_MASK)+info->fix.mmio_len);
299 pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE|_PAGE_GUARDED;
300 } else {
301 /* framebuffer */
302 pgprot_val(vma->vm_page_prot) |= _PAGE_WRITETHRU;
303 }
304 start &= PAGE_MASK;
305 if ((vma->vm_end - vma->vm_start + off) > len)
306 return -EINVAL;
307 off += start;
308 vma->vm_pgoff = off >> PAGE_SHIFT;
309 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
310 vma->vm_end - vma->vm_start, vma->vm_page_prot))
311 return -EAGAIN;
312
313 return 0;
314 }
315
316 static int controlfb_blank(int blank_mode, struct fb_info *info)
317 {
318 struct fb_info_control *p = (struct fb_info_control *) info;
319 unsigned ctrl;
320
321 ctrl = ld_le32(CNTRL_REG(p,ctrl));
322 if (blank_mode > 0)
323 switch (blank_mode) {
324 case FB_BLANK_VSYNC_SUSPEND:
325 ctrl &= ~3;
326 break;
327 case FB_BLANK_HSYNC_SUSPEND:
328 ctrl &= ~0x30;
329 break;
330 case FB_BLANK_POWERDOWN:
331 ctrl &= ~0x33;
332 /* fall through */
333 case FB_BLANK_NORMAL:
334 ctrl |= 0x400;
335 break;
336 default:
337 break;
338 }
339 else {
340 ctrl &= ~0x400;
341 ctrl |= 0x33;
342 }
343 out_le32(CNTRL_REG(p,ctrl), ctrl);
344
345 return 0;
346 }
347
348 static int controlfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
349 u_int transp, struct fb_info *info)
350 {
351 struct fb_info_control *p = (struct fb_info_control *) info;
352 __u8 r, g, b;
353
354 if (regno > 255)
355 return 1;
356
357 r = red >> 8;
358 g = green >> 8;
359 b = blue >> 8;
360
361 out_8(&p->cmap_regs->addr, regno); /* tell clut what addr to fill */
362 out_8(&p->cmap_regs->lut, r); /* send one color channel at */
363 out_8(&p->cmap_regs->lut, g); /* a time... */
364 out_8(&p->cmap_regs->lut, b);
365
366 if (regno < 16) {
367 int i;
368 switch (p->par.cmode) {
369 case CMODE_16:
370 p->pseudo_palette[regno] =
371 (regno << 10) | (regno << 5) | regno;
372 break;
373 case CMODE_32:
374 i = (regno << 8) | regno;
375 p->pseudo_palette[regno] = (i << 16) | i;
376 break;
377 }
378 }
379
380 return 0;
381 }
382
383
384 /******************** End of controlfb_ops implementation ******************/
385
386
387
388 static void set_control_clock(unsigned char *params)
389 {
390 #ifdef CONFIG_ADB_CUDA
391 struct adb_request req;
392 int i;
393
394 for (i = 0; i < 3; ++i) {
395 cuda_request(&req, NULL, 5, CUDA_PACKET, CUDA_GET_SET_IIC,
396 0x50, i + 1, params[i]);
397 while (!req.complete)
398 cuda_poll();
399 }
400 #endif
401 }
402
403
404 /*
405 * finish off the driver initialization and register
406 */
407 static int __init init_control(struct fb_info_control *p)
408 {
409 int full, sense, vmode, cmode, vyres;
410 struct fb_var_screeninfo var;
411 int rc;
412
413 printk(KERN_INFO "controlfb: ");
414
415 full = p->total_vram == 0x400000;
416
417 /* Try to pick a video mode out of NVRAM if we have one. */
418 #ifdef CONFIG_NVRAM
419 if (default_cmode == CMODE_NVRAM){
420 cmode = nvram_read_byte(NV_CMODE);
421 if(cmode < CMODE_8 || cmode > CMODE_32)
422 cmode = CMODE_8;
423 } else
424 #endif
425 cmode=default_cmode;
426 #ifdef CONFIG_NVRAM
427 if (default_vmode == VMODE_NVRAM) {
428 vmode = nvram_read_byte(NV_VMODE);
429 if (vmode < 1 || vmode > VMODE_MAX ||
430 control_mac_modes[vmode - 1].m[full] < cmode) {
431 sense = read_control_sense(p);
432 printk("Monitor sense value = 0x%x, ", sense);
433 vmode = mac_map_monitor_sense(sense);
434 if (control_mac_modes[vmode - 1].m[full] < cmode)
435 vmode = VMODE_640_480_60;
436 }
437 } else
438 #endif
439 {
440 vmode=default_vmode;
441 if (control_mac_modes[vmode - 1].m[full] < cmode) {
442 if (cmode > CMODE_8)
443 cmode--;
444 else
445 vmode = VMODE_640_480_60;
446 }
447 }
448
449 /* Initialize info structure */
450 control_init_info(&p->info, p);
451
452 /* Setup default var */
453 if (mac_vmode_to_var(vmode, cmode, &var) < 0) {
454 /* This shouldn't happen! */
455 printk("mac_vmode_to_var(%d, %d,) failed\n", vmode, cmode);
456 try_again:
457 vmode = VMODE_640_480_60;
458 cmode = CMODE_8;
459 if (mac_vmode_to_var(vmode, cmode, &var) < 0) {
460 printk(KERN_ERR "controlfb: mac_vmode_to_var() failed\n");
461 return -ENXIO;
462 }
463 printk(KERN_INFO "controlfb: ");
464 }
465 printk("using video mode %d and color mode %d.\n", vmode, cmode);
466
467 vyres = (p->total_vram - CTRLFB_OFF) / (var.xres << cmode);
468 if (vyres > var.yres)
469 var.yres_virtual = vyres;
470
471 /* Apply default var */
472 var.activate = FB_ACTIVATE_NOW;
473 rc = fb_set_var(&p->info, &var);
474 if (rc && (vmode != VMODE_640_480_60 || cmode != CMODE_8))
475 goto try_again;
476
477 /* Register with fbdev layer */
478 if (register_framebuffer(&p->info) < 0)
479 return -ENXIO;
480
481 printk(KERN_INFO "fb%d: control display adapter\n", p->info.node);
482
483 return 0;
484 }
485
486 #define RADACAL_WRITE(a,d) \
487 out_8(&p->cmap_regs->addr, (a)); \
488 out_8(&p->cmap_regs->dat, (d))
489
490 /* Now how about actually saying, Make it so! */
491 /* Some things in here probably don't need to be done each time. */
492 static void control_set_hardware(struct fb_info_control *p, struct fb_par_control *par)
493 {
494 struct control_regvals *r;
495 volatile struct preg __iomem *rp;
496 int i, cmode;
497
498 if (PAR_EQUAL(&p->par, par)) {
499 /*
500 * check if only xoffset or yoffset differs.
501 * this prevents flickers in typical VT switch case.
502 */
503 if (p->par.xoffset != par->xoffset ||
504 p->par.yoffset != par->yoffset)
505 set_screen_start(par->xoffset, par->yoffset, p);
506
507 return;
508 }
509
510 p->par = *par;
511 cmode = p->par.cmode;
512 r = &par->regvals;
513
514 /* Turn off display */
515 out_le32(CNTRL_REG(p,ctrl), 0x400 | par->ctrl);
516
517 set_control_clock(r->clock_params);
518
519 RADACAL_WRITE(0x20, r->radacal_ctrl);
520 RADACAL_WRITE(0x21, p->control_use_bank2 ? 0 : 1);
521 RADACAL_WRITE(0x10, 0);
522 RADACAL_WRITE(0x11, 0);
523
524 rp = &p->control_regs->vswin;
525 for (i = 0; i < 16; ++i, ++rp)
526 out_le32(&rp->r, r->regs[i]);
527
528 out_le32(CNTRL_REG(p,pitch), par->pitch);
529 out_le32(CNTRL_REG(p,mode), r->mode);
530 out_le32(CNTRL_REG(p,vram_attr), p->vram_attr);
531 out_le32(CNTRL_REG(p,start_addr), par->yoffset * par->pitch
532 + (par->xoffset << cmode));
533 out_le32(CNTRL_REG(p,rfrcnt), 0x1e5);
534 out_le32(CNTRL_REG(p,intr_ena), 0);
535
536 /* Turn on display */
537 out_le32(CNTRL_REG(p,ctrl), par->ctrl);
538
539 #ifdef CONFIG_BOOTX_TEXT
540 btext_update_display(p->frame_buffer_phys + CTRLFB_OFF,
541 p->par.xres, p->par.yres,
542 (cmode == CMODE_32? 32: cmode == CMODE_16? 16: 8),
543 p->par.pitch);
544 #endif /* CONFIG_BOOTX_TEXT */
545 }
546
547
548 /*
549 * Parse user speficied options (`video=controlfb:')
550 */
551 static void __init control_setup(char *options)
552 {
553 char *this_opt;
554
555 if (!options || !*options)
556 return;
557
558 while ((this_opt = strsep(&options, ",")) != NULL) {
559 if (!strncmp(this_opt, "vmode:", 6)) {
560 int vmode = simple_strtoul(this_opt+6, NULL, 0);
561 if (vmode > 0 && vmode <= VMODE_MAX &&
562 control_mac_modes[vmode - 1].m[1] >= 0)
563 default_vmode = vmode;
564 } else if (!strncmp(this_opt, "cmode:", 6)) {
565 int depth = simple_strtoul(this_opt+6, NULL, 0);
566 switch (depth) {
567 case CMODE_8:
568 case CMODE_16:
569 case CMODE_32:
570 default_cmode = depth;
571 break;
572 case 8:
573 default_cmode = CMODE_8;
574 break;
575 case 15:
576 case 16:
577 default_cmode = CMODE_16;
578 break;
579 case 24:
580 case 32:
581 default_cmode = CMODE_32;
582 break;
583 }
584 }
585 }
586 }
587
588 static int __init control_init(void)
589 {
590 struct device_node *dp;
591 char *option = NULL;
592
593 if (fb_get_options("controlfb", &option))
594 return -ENODEV;
595 control_setup(option);
596
597 dp = find_devices("control");
598 if (dp != 0 && !control_of_init(dp))
599 return 0;
600
601 return -ENXIO;
602 }
603
604 module_init(control_init);
605
606 /* Work out which banks of VRAM we have installed. */
607 /* danj: I guess the card just ignores writes to nonexistant VRAM... */
608
609 static void __init find_vram_size(struct fb_info_control *p)
610 {
611 int bank1, bank2;
612
613 /*
614 * Set VRAM in 2MB (bank 1) mode
615 * VRAM Bank 2 will be accessible through offset 0x600000 if present
616 * and VRAM Bank 1 will not respond at that offset even if present
617 */
618 out_le32(CNTRL_REG(p,vram_attr), 0x31);
619
620 out_8(&p->frame_buffer[0x600000], 0xb3);
621 out_8(&p->frame_buffer[0x600001], 0x71);
622 asm volatile("eieio; dcbf 0,%0" : : "r" (&p->frame_buffer[0x600000])
623 : "memory" );
624 mb();
625 asm volatile("eieio; dcbi 0,%0" : : "r" (&p->frame_buffer[0x600000])
626 : "memory" );
627 mb();
628
629 bank2 = (in_8(&p->frame_buffer[0x600000]) == 0xb3)
630 && (in_8(&p->frame_buffer[0x600001]) == 0x71);
631
632 /*
633 * Set VRAM in 2MB (bank 2) mode
634 * VRAM Bank 1 will be accessible through offset 0x000000 if present
635 * and VRAM Bank 2 will not respond at that offset even if present
636 */
637 out_le32(CNTRL_REG(p,vram_attr), 0x39);
638
639 out_8(&p->frame_buffer[0], 0x5a);
640 out_8(&p->frame_buffer[1], 0xc7);
641 asm volatile("eieio; dcbf 0,%0" : : "r" (&p->frame_buffer[0])
642 : "memory" );
643 mb();
644 asm volatile("eieio; dcbi 0,%0" : : "r" (&p->frame_buffer[0])
645 : "memory" );
646 mb();
647
648 bank1 = (in_8(&p->frame_buffer[0]) == 0x5a)
649 && (in_8(&p->frame_buffer[1]) == 0xc7);
650
651 if (bank2) {
652 if (!bank1) {
653 /*
654 * vram bank 2 only
655 */
656 p->control_use_bank2 = 1;
657 p->vram_attr = 0x39;
658 p->frame_buffer += 0x600000;
659 p->frame_buffer_phys += 0x600000;
660 } else {
661 /*
662 * 4 MB vram
663 */
664 p->vram_attr = 0x51;
665 }
666 } else {
667 /*
668 * vram bank 1 only
669 */
670 p->vram_attr = 0x31;
671 }
672
673 p->total_vram = (bank1 + bank2) * 0x200000;
674
675 printk(KERN_INFO "controlfb: VRAM Total = %dMB "
676 "(%dMB @ bank 1, %dMB @ bank 2)\n",
677 (bank1 + bank2) << 1, bank1 << 1, bank2 << 1);
678 }
679
680
681 /*
682 * find "control" and initialize
683 */
684 static int __init control_of_init(struct device_node *dp)
685 {
686 struct fb_info_control *p;
687 struct resource fb_res, reg_res;
688
689 if (control_fb) {
690 printk(KERN_ERR "controlfb: only one control is supported\n");
691 return -ENXIO;
692 }
693
694 if (of_pci_address_to_resource(dp, 2, &fb_res) ||
695 of_pci_address_to_resource(dp, 1, &reg_res)) {
696 printk(KERN_ERR "can't get 2 addresses for control\n");
697 return -ENXIO;
698 }
699 p = kzalloc(sizeof(*p), GFP_KERNEL);
700 if (p == 0)
701 return -ENXIO;
702 control_fb = p; /* save it for cleanups */
703
704 /* Map in frame buffer and registers */
705 p->fb_orig_base = fb_res.start;
706 p->fb_orig_size = fb_res.end - fb_res.start + 1;
707 /* use the big-endian aperture (??) */
708 p->frame_buffer_phys = fb_res.start + 0x800000;
709 p->control_regs_phys = reg_res.start;
710 p->control_regs_size = reg_res.end - reg_res.start + 1;
711
712 if (!p->fb_orig_base ||
713 !request_mem_region(p->fb_orig_base,p->fb_orig_size,"controlfb")) {
714 p->fb_orig_base = 0;
715 goto error_out;
716 }
717 /* map at most 8MB for the frame buffer */
718 p->frame_buffer = __ioremap(p->frame_buffer_phys, 0x800000,
719 _PAGE_WRITETHRU);
720
721 if (!p->control_regs_phys ||
722 !request_mem_region(p->control_regs_phys, p->control_regs_size,
723 "controlfb regs")) {
724 p->control_regs_phys = 0;
725 goto error_out;
726 }
727 p->control_regs = ioremap(p->control_regs_phys, p->control_regs_size);
728
729 p->cmap_regs_phys = 0xf301b000; /* XXX not in prom? */
730 if (!request_mem_region(p->cmap_regs_phys, 0x1000, "controlfb cmap")) {
731 p->cmap_regs_phys = 0;
732 goto error_out;
733 }
734 p->cmap_regs = ioremap(p->cmap_regs_phys, 0x1000);
735
736 if (!p->cmap_regs || !p->control_regs || !p->frame_buffer)
737 goto error_out;
738
739 find_vram_size(p);
740 if (!p->total_vram)
741 goto error_out;
742
743 if (init_control(p) < 0)
744 goto error_out;
745
746 return 0;
747
748 error_out:
749 control_cleanup();
750 return -ENXIO;
751 }
752
753 /*
754 * Get the monitor sense value.
755 * Note that this can be called before calibrate_delay,
756 * so we can't use udelay.
757 */
758 static int read_control_sense(struct fb_info_control *p)
759 {
760 int sense;
761
762 out_le32(CNTRL_REG(p,mon_sense), 7); /* drive all lines high */
763 __delay(200);
764 out_le32(CNTRL_REG(p,mon_sense), 077); /* turn off drivers */
765 __delay(2000);
766 sense = (in_le32(CNTRL_REG(p,mon_sense)) & 0x1c0) << 2;
767
768 /* drive each sense line low in turn and collect the other 2 */
769 out_le32(CNTRL_REG(p,mon_sense), 033); /* drive A low */
770 __delay(2000);
771 sense |= (in_le32(CNTRL_REG(p,mon_sense)) & 0xc0) >> 2;
772 out_le32(CNTRL_REG(p,mon_sense), 055); /* drive B low */
773 __delay(2000);
774 sense |= ((in_le32(CNTRL_REG(p,mon_sense)) & 0x100) >> 5)
775 | ((in_le32(CNTRL_REG(p,mon_sense)) & 0x40) >> 4);
776 out_le32(CNTRL_REG(p,mon_sense), 066); /* drive C low */
777 __delay(2000);
778 sense |= (in_le32(CNTRL_REG(p,mon_sense)) & 0x180) >> 7;
779
780 out_le32(CNTRL_REG(p,mon_sense), 077); /* turn off drivers */
781
782 return sense;
783 }
784
785 /********************** Various translation functions **********************/
786
787 #define CONTROL_PIXCLOCK_BASE 256016
788 #define CONTROL_PIXCLOCK_MIN 5000 /* ~ 200 MHz dot clock */
789
790 /*
791 * calculate the clock paramaters to be sent to CUDA according to given
792 * pixclock in pico second.
793 */
794 static int calc_clock_params(unsigned long clk, unsigned char *param)
795 {
796 unsigned long p0, p1, p2, k, l, m, n, min;
797
798 if (clk > (CONTROL_PIXCLOCK_BASE << 3))
799 return 1;
800
801 p2 = ((clk << 4) < CONTROL_PIXCLOCK_BASE)? 3: 2;
802 l = clk << p2;
803 p0 = 0;
804 p1 = 0;
805 for (k = 1, min = l; k < 32; k++) {
806 unsigned long rem;
807
808 m = CONTROL_PIXCLOCK_BASE * k;
809 n = m / l;
810 rem = m % l;
811 if (n && (n < 128) && rem < min) {
812 p0 = k;
813 p1 = n;
814 min = rem;
815 }
816 }
817 if (!p0 || !p1)
818 return 1;
819
820 param[0] = p0;
821 param[1] = p1;
822 param[2] = p2;
823
824 return 0;
825 }
826
827
828 /*
829 * This routine takes a user-supplied var, and picks the best vmode/cmode
830 * from it.
831 */
832
833 static int control_var_to_par(struct fb_var_screeninfo *var,
834 struct fb_par_control *par, const struct fb_info *fb_info)
835 {
836 int cmode, piped_diff, hstep;
837 unsigned hperiod, hssync, hsblank, hesync, heblank, piped, heq, hlfln,
838 hserr, vperiod, vssync, vesync, veblank, vsblank, vswin, vewin;
839 unsigned long pixclock;
840 struct fb_info_control *p = (struct fb_info_control *) fb_info;
841 struct control_regvals *r = &par->regvals;
842
843 switch (var->bits_per_pixel) {
844 case 8:
845 par->cmode = CMODE_8;
846 if (p->total_vram > 0x200000) {
847 r->mode = 3;
848 r->radacal_ctrl = 0x20;
849 piped_diff = 13;
850 } else {
851 r->mode = 2;
852 r->radacal_ctrl = 0x10;
853 piped_diff = 9;
854 }
855 break;
856 case 15:
857 case 16:
858 par->cmode = CMODE_16;
859 if (p->total_vram > 0x200000) {
860 r->mode = 2;
861 r->radacal_ctrl = 0x24;
862 piped_diff = 5;
863 } else {
864 r->mode = 1;
865 r->radacal_ctrl = 0x14;
866 piped_diff = 3;
867 }
868 break;
869 case 32:
870 par->cmode = CMODE_32;
871 if (p->total_vram > 0x200000) {
872 r->mode = 1;
873 r->radacal_ctrl = 0x28;
874 } else {
875 r->mode = 0;
876 r->radacal_ctrl = 0x18;
877 }
878 piped_diff = 1;
879 break;
880 default:
881 return -EINVAL;
882 }
883
884 /*
885 * adjust xres and vxres so that the corresponding memory widths are
886 * 32-byte aligned
887 */
888 hstep = 31 >> par->cmode;
889 par->xres = (var->xres + hstep) & ~hstep;
890 par->vxres = (var->xres_virtual + hstep) & ~hstep;
891 par->xoffset = (var->xoffset + hstep) & ~hstep;
892 if (par->vxres < par->xres)
893 par->vxres = par->xres;
894 par->pitch = par->vxres << par->cmode;
895
896 par->yres = var->yres;
897 par->vyres = var->yres_virtual;
898 par->yoffset = var->yoffset;
899 if (par->vyres < par->yres)
900 par->vyres = par->yres;
901
902 par->sync = var->sync;
903
904 if (par->pitch * par->vyres + CTRLFB_OFF > p->total_vram)
905 return -EINVAL;
906
907 if (par->xoffset + par->xres > par->vxres)
908 par->xoffset = par->vxres - par->xres;
909 if (par->yoffset + par->yres > par->vyres)
910 par->yoffset = par->vyres - par->yres;
911
912 pixclock = (var->pixclock < CONTROL_PIXCLOCK_MIN)? CONTROL_PIXCLOCK_MIN:
913 var->pixclock;
914 if (calc_clock_params(pixclock, r->clock_params))
915 return -EINVAL;
916
917 hperiod = ((var->left_margin + par->xres + var->right_margin
918 + var->hsync_len) >> 1) - 2;
919 hssync = hperiod + 1;
920 hsblank = hssync - (var->right_margin >> 1);
921 hesync = (var->hsync_len >> 1) - 1;
922 heblank = (var->left_margin >> 1) + hesync;
923 piped = heblank - piped_diff;
924 heq = var->hsync_len >> 2;
925 hlfln = (hperiod+2) >> 1;
926 hserr = hssync-hesync;
927 vperiod = (var->vsync_len + var->lower_margin + par->yres
928 + var->upper_margin) << 1;
929 vssync = vperiod - 2;
930 vesync = (var->vsync_len << 1) - vperiod + vssync;
931 veblank = (var->upper_margin << 1) + vesync;
932 vsblank = vssync - (var->lower_margin << 1);
933 vswin = (vsblank+vssync) >> 1;
934 vewin = (vesync+veblank) >> 1;
935
936 r->regs[0] = vswin;
937 r->regs[1] = vsblank;
938 r->regs[2] = veblank;
939 r->regs[3] = vewin;
940 r->regs[4] = vesync;
941 r->regs[5] = vssync;
942 r->regs[6] = vperiod;
943 r->regs[7] = piped;
944 r->regs[8] = hperiod;
945 r->regs[9] = hsblank;
946 r->regs[10] = heblank;
947 r->regs[11] = hesync;
948 r->regs[12] = hssync;
949 r->regs[13] = heq;
950 r->regs[14] = hlfln;
951 r->regs[15] = hserr;
952
953 if (par->xres >= 1280 && par->cmode >= CMODE_16)
954 par->ctrl = 0x7f;
955 else
956 par->ctrl = 0x3b;
957
958 if (mac_var_to_vmode(var, &par->vmode, &cmode))
959 par->vmode = 0;
960
961 return 0;
962 }
963
964
965 /*
966 * Convert hardware data in par to an fb_var_screeninfo
967 */
968
969 static void control_par_to_var(struct fb_par_control *par, struct fb_var_screeninfo *var)
970 {
971 struct control_regints *rv;
972
973 rv = (struct control_regints *) par->regvals.regs;
974
975 memset(var, 0, sizeof(*var));
976 var->xres = par->xres;
977 var->yres = par->yres;
978 var->xres_virtual = par->vxres;
979 var->yres_virtual = par->vyres;
980 var->xoffset = par->xoffset;
981 var->yoffset = par->yoffset;
982
983 switch(par->cmode) {
984 default:
985 case CMODE_8:
986 var->bits_per_pixel = 8;
987 var->red.length = 8;
988 var->green.length = 8;
989 var->blue.length = 8;
990 break;
991 case CMODE_16: /* RGB 555 */
992 var->bits_per_pixel = 16;
993 var->red.offset = 10;
994 var->red.length = 5;
995 var->green.offset = 5;
996 var->green.length = 5;
997 var->blue.length = 5;
998 break;
999 case CMODE_32: /* RGB 888 */
1000 var->bits_per_pixel = 32;
1001 var->red.offset = 16;
1002 var->red.length = 8;
1003 var->green.offset = 8;
1004 var->green.length = 8;
1005 var->blue.length = 8;
1006 var->transp.offset = 24;
1007 var->transp.length = 8;
1008 break;
1009 }
1010 var->height = -1;
1011 var->width = -1;
1012 var->vmode = FB_VMODE_NONINTERLACED;
1013
1014 var->left_margin = (rv->heblank - rv->hesync) << 1;
1015 var->right_margin = (rv->hssync - rv->hsblank) << 1;
1016 var->hsync_len = (rv->hperiod + 2 - rv->hssync + rv->hesync) << 1;
1017
1018 var->upper_margin = (rv->veblank - rv->vesync) >> 1;
1019 var->lower_margin = (rv->vssync - rv->vsblank) >> 1;
1020 var->vsync_len = (rv->vperiod - rv->vssync + rv->vesync) >> 1;
1021
1022 var->sync = par->sync;
1023
1024 /*
1025 * 10^12 * clock_params[0] / (3906400 * clock_params[1]
1026 * * 2^clock_params[2])
1027 * (10^12 * clock_params[0] / (3906400 * clock_params[1]))
1028 * >> clock_params[2]
1029 */
1030 /* (255990.17 * clock_params[0] / clock_params[1]) >> clock_params[2] */
1031 var->pixclock = CONTROL_PIXCLOCK_BASE * par->regvals.clock_params[0];
1032 var->pixclock /= par->regvals.clock_params[1];
1033 var->pixclock >>= par->regvals.clock_params[2];
1034 }
1035
1036 /*
1037 * Set misc info vars for this driver
1038 */
1039 static void __init control_init_info(struct fb_info *info, struct fb_info_control *p)
1040 {
1041 /* Fill fb_info */
1042 info->par = &p->par;
1043 info->fbops = &controlfb_ops;
1044 info->pseudo_palette = p->pseudo_palette;
1045 info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
1046 info->screen_base = p->frame_buffer + CTRLFB_OFF;
1047
1048 fb_alloc_cmap(&info->cmap, 256, 0);
1049
1050 /* Fill fix common fields */
1051 strcpy(info->fix.id, "control");
1052 info->fix.mmio_start = p->control_regs_phys;
1053 info->fix.mmio_len = sizeof(struct control_regs);
1054 info->fix.type = FB_TYPE_PACKED_PIXELS;
1055 info->fix.smem_start = p->frame_buffer_phys + CTRLFB_OFF;
1056 info->fix.smem_len = p->total_vram - CTRLFB_OFF;
1057 info->fix.ywrapstep = 0;
1058 info->fix.type_aux = 0;
1059 info->fix.accel = FB_ACCEL_NONE;
1060 }
1061
1062
1063 static void control_cleanup(void)
1064 {
1065 struct fb_info_control *p = control_fb;
1066
1067 if (!p)
1068 return;
1069
1070 if (p->cmap_regs)
1071 iounmap(p->cmap_regs);
1072 if (p->control_regs)
1073 iounmap(p->control_regs);
1074 if (p->frame_buffer) {
1075 if (p->control_use_bank2)
1076 p->frame_buffer -= 0x600000;
1077 iounmap(p->frame_buffer);
1078 }
1079 if (p->cmap_regs_phys)
1080 release_mem_region(p->cmap_regs_phys, 0x1000);
1081 if (p->control_regs_phys)
1082 release_mem_region(p->control_regs_phys, p->control_regs_size);
1083 if (p->fb_orig_base)
1084 release_mem_region(p->fb_orig_base, p->fb_orig_size);
1085 kfree(p);
1086 }
1087
1088
Linux kernel - Deliverables
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