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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / drivers / video / controlfb.c
blobb0be7eac32d817c8cec0255374ae80ab87483d87
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[16];
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 int ret = -ENXIO;
183
184 dp = of_find_node_by_name(NULL, "control");
185 if (dp != 0 && !control_of_init(dp))
186 ret = 0;
187 of_node_put(dp);
188
189 return ret;
190 }
191
192 void cleanup_module(void)
193 {
194 control_cleanup();
195 }
196 #endif
197
198 /*
199 * Checks a var structure
200 */
201 static int controlfb_check_var (struct fb_var_screeninfo *var, struct fb_info *info)
202 {
203 struct fb_par_control par;
204 int err;
205
206 err = control_var_to_par(var, &par, info);
207 if (err)
208 return err;
209 control_par_to_var(&par, var);
210
211 return 0;
212 }
213
214 /*
215 * Applies current var to display
216 */
217 static int controlfb_set_par (struct fb_info *info)
218 {
219 struct fb_info_control *p = (struct fb_info_control *) info;
220 struct fb_par_control par;
221 int err;
222
223 if((err = control_var_to_par(&info->var, &par, info))) {
224 printk (KERN_ERR "controlfb_set_par: error calling"
225 " control_var_to_par: %d.\n", err);
226 return err;
227 }
228
229 control_set_hardware(p, &par);
230
231 info->fix.visual = (p->par.cmode == CMODE_8) ?
232 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_DIRECTCOLOR;
233 info->fix.line_length = p->par.pitch;
234 info->fix.xpanstep = 32 >> p->par.cmode;
235 info->fix.ypanstep = 1;
236
237 return 0;
238 }
239
240 /*
241 * Set screen start address according to var offset values
242 */
243 static inline void set_screen_start(int xoffset, int yoffset,
244 struct fb_info_control *p)
245 {
246 struct fb_par_control *par = &p->par;
247
248 par->xoffset = xoffset;
249 par->yoffset = yoffset;
250 out_le32(CNTRL_REG(p,start_addr),
251 par->yoffset * par->pitch + (par->xoffset << par->cmode));
252 }
253
254
255 static int controlfb_pan_display(struct fb_var_screeninfo *var,
256 struct fb_info *info)
257 {
258 unsigned int xoffset, hstep;
259 struct fb_info_control *p = (struct fb_info_control *)info;
260 struct fb_par_control *par = &p->par;
261
262 /*
263 * make sure start addr will be 32-byte aligned
264 */
265 hstep = 0x1f >> par->cmode;
266 xoffset = (var->xoffset + hstep) & ~hstep;
267
268 if (xoffset+par->xres > par->vxres ||
269 var->yoffset+par->yres > par->vyres)
270 return -EINVAL;
271
272 set_screen_start(xoffset, var->yoffset, p);
273
274 return 0;
275 }
276
277
278 /*
279 * Private mmap since we want to have a different caching on the framebuffer
280 * for controlfb.
281 * Note there's no locking in here; it's done in fb_mmap() in fbmem.c.
282 */
283 static int controlfb_mmap(struct fb_info *info,
284 struct vm_area_struct *vma)
285 {
286 unsigned long off, start;
287 u32 len;
288
289 off = vma->vm_pgoff << PAGE_SHIFT;
290
291 /* frame buffer memory */
292 start = info->fix.smem_start;
293 len = PAGE_ALIGN((start & ~PAGE_MASK)+info->fix.smem_len);
294 if (off >= len) {
295 /* memory mapped io */
296 off -= len;
297 if (info->var.accel_flags)
298 return -EINVAL;
299 start = info->fix.mmio_start;
300 len = PAGE_ALIGN((start & ~PAGE_MASK)+info->fix.mmio_len);
301 pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE|_PAGE_GUARDED;
302 } else {
303 /* framebuffer */
304 pgprot_val(vma->vm_page_prot) |= _PAGE_WRITETHRU;
305 }
306 start &= PAGE_MASK;
307 if ((vma->vm_end - vma->vm_start + off) > len)
308 return -EINVAL;
309 off += start;
310 vma->vm_pgoff = off >> PAGE_SHIFT;
311 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
312 vma->vm_end - vma->vm_start, vma->vm_page_prot))
313 return -EAGAIN;
314
315 return 0;
316 }
317
318 static int controlfb_blank(int blank_mode, struct fb_info *info)
319 {
320 struct fb_info_control *p = (struct fb_info_control *) info;
321 unsigned ctrl;
322
323 ctrl = ld_le32(CNTRL_REG(p,ctrl));
324 if (blank_mode > 0)
325 switch (blank_mode) {
326 case FB_BLANK_VSYNC_SUSPEND:
327 ctrl &= ~3;
328 break;
329 case FB_BLANK_HSYNC_SUSPEND:
330 ctrl &= ~0x30;
331 break;
332 case FB_BLANK_POWERDOWN:
333 ctrl &= ~0x33;
334 /* fall through */
335 case FB_BLANK_NORMAL:
336 ctrl |= 0x400;
337 break;
338 default:
339 break;
340 }
341 else {
342 ctrl &= ~0x400;
343 ctrl |= 0x33;
344 }
345 out_le32(CNTRL_REG(p,ctrl), ctrl);
346
347 return 0;
348 }
349
350 static int controlfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
351 u_int transp, struct fb_info *info)
352 {
353 struct fb_info_control *p = (struct fb_info_control *) info;
354 __u8 r, g, b;
355
356 if (regno > 255)
357 return 1;
358
359 r = red >> 8;
360 g = green >> 8;
361 b = blue >> 8;
362
363 out_8(&p->cmap_regs->addr, regno); /* tell clut what addr to fill */
364 out_8(&p->cmap_regs->lut, r); /* send one color channel at */
365 out_8(&p->cmap_regs->lut, g); /* a time... */
366 out_8(&p->cmap_regs->lut, b);
367
368 if (regno < 16) {
369 int i;
370 switch (p->par.cmode) {
371 case CMODE_16:
372 p->pseudo_palette[regno] =
373 (regno << 10) | (regno << 5) | regno;
374 break;
375 case CMODE_32:
376 i = (regno << 8) | regno;
377 p->pseudo_palette[regno] = (i << 16) | i;
378 break;
379 }
380 }
381
382 return 0;
383 }
384
385
386 /******************** End of controlfb_ops implementation ******************/
387
388
389
390 static void set_control_clock(unsigned char *params)
391 {
392 #ifdef CONFIG_ADB_CUDA
393 struct adb_request req;
394 int i;
395
396 for (i = 0; i < 3; ++i) {
397 cuda_request(&req, NULL, 5, CUDA_PACKET, CUDA_GET_SET_IIC,
398 0x50, i + 1, params[i]);
399 while (!req.complete)
400 cuda_poll();
401 }
402 #endif
403 }
404
405
406 /*
407 * finish off the driver initialization and register
408 */
409 static int __init init_control(struct fb_info_control *p)
410 {
411 int full, sense, vmode, cmode, vyres;
412 struct fb_var_screeninfo var;
413 int rc;
414
415 printk(KERN_INFO "controlfb: ");
416
417 full = p->total_vram == 0x400000;
418
419 /* Try to pick a video mode out of NVRAM if we have one. */
420 #ifdef CONFIG_NVRAM
421 if (default_cmode == CMODE_NVRAM){
422 cmode = nvram_read_byte(NV_CMODE);
423 if(cmode < CMODE_8 || cmode > CMODE_32)
424 cmode = CMODE_8;
425 } else
426 #endif
427 cmode=default_cmode;
428 #ifdef CONFIG_NVRAM
429 if (default_vmode == VMODE_NVRAM) {
430 vmode = nvram_read_byte(NV_VMODE);
431 if (vmode < 1 || vmode > VMODE_MAX ||
432 control_mac_modes[vmode - 1].m[full] < cmode) {
433 sense = read_control_sense(p);
434 printk("Monitor sense value = 0x%x, ", sense);
435 vmode = mac_map_monitor_sense(sense);
436 if (control_mac_modes[vmode - 1].m[full] < cmode)
437 vmode = VMODE_640_480_60;
438 }
439 } else
440 #endif
441 {
442 vmode=default_vmode;
443 if (control_mac_modes[vmode - 1].m[full] < cmode) {
444 if (cmode > CMODE_8)
445 cmode--;
446 else
447 vmode = VMODE_640_480_60;
448 }
449 }
450
451 /* Initialize info structure */
452 control_init_info(&p->info, p);
453
454 /* Setup default var */
455 if (mac_vmode_to_var(vmode, cmode, &var) < 0) {
456 /* This shouldn't happen! */
457 printk("mac_vmode_to_var(%d, %d,) failed\n", vmode, cmode);
458 try_again:
459 vmode = VMODE_640_480_60;
460 cmode = CMODE_8;
461 if (mac_vmode_to_var(vmode, cmode, &var) < 0) {
462 printk(KERN_ERR "controlfb: mac_vmode_to_var() failed\n");
463 return -ENXIO;
464 }
465 printk(KERN_INFO "controlfb: ");
466 }
467 printk("using video mode %d and color mode %d.\n", vmode, cmode);
468
469 vyres = (p->total_vram - CTRLFB_OFF) / (var.xres << cmode);
470 if (vyres > var.yres)
471 var.yres_virtual = vyres;
472
473 /* Apply default var */
474 var.activate = FB_ACTIVATE_NOW;
475 rc = fb_set_var(&p->info, &var);
476 if (rc && (vmode != VMODE_640_480_60 || cmode != CMODE_8))
477 goto try_again;
478
479 /* Register with fbdev layer */
480 if (register_framebuffer(&p->info) < 0)
481 return -ENXIO;
482
483 printk(KERN_INFO "fb%d: control display adapter\n", p->info.node);
484
485 return 0;
486 }
487
488 #define RADACAL_WRITE(a,d) \
489 out_8(&p->cmap_regs->addr, (a)); \
490 out_8(&p->cmap_regs->dat, (d))
491
492 /* Now how about actually saying, Make it so! */
493 /* Some things in here probably don't need to be done each time. */
494 static void control_set_hardware(struct fb_info_control *p, struct fb_par_control *par)
495 {
496 struct control_regvals *r;
497 volatile struct preg __iomem *rp;
498 int i, cmode;
499
500 if (PAR_EQUAL(&p->par, par)) {
501 /*
502 * check if only xoffset or yoffset differs.
503 * this prevents flickers in typical VT switch case.
504 */
505 if (p->par.xoffset != par->xoffset ||
506 p->par.yoffset != par->yoffset)
507 set_screen_start(par->xoffset, par->yoffset, p);
508
509 return;
510 }
511
512 p->par = *par;
513 cmode = p->par.cmode;
514 r = &par->regvals;
515
516 /* Turn off display */
517 out_le32(CNTRL_REG(p,ctrl), 0x400 | par->ctrl);
518
519 set_control_clock(r->clock_params);
520
521 RADACAL_WRITE(0x20, r->radacal_ctrl);
522 RADACAL_WRITE(0x21, p->control_use_bank2 ? 0 : 1);
523 RADACAL_WRITE(0x10, 0);
524 RADACAL_WRITE(0x11, 0);
525
526 rp = &p->control_regs->vswin;
527 for (i = 0; i < 16; ++i, ++rp)
528 out_le32(&rp->r, r->regs[i]);
529
530 out_le32(CNTRL_REG(p,pitch), par->pitch);
531 out_le32(CNTRL_REG(p,mode), r->mode);
532 out_le32(CNTRL_REG(p,vram_attr), p->vram_attr);
533 out_le32(CNTRL_REG(p,start_addr), par->yoffset * par->pitch
534 + (par->xoffset << cmode));
535 out_le32(CNTRL_REG(p,rfrcnt), 0x1e5);
536 out_le32(CNTRL_REG(p,intr_ena), 0);
537
538 /* Turn on display */
539 out_le32(CNTRL_REG(p,ctrl), par->ctrl);
540
541 #ifdef CONFIG_BOOTX_TEXT
542 btext_update_display(p->frame_buffer_phys + CTRLFB_OFF,
543 p->par.xres, p->par.yres,
544 (cmode == CMODE_32? 32: cmode == CMODE_16? 16: 8),
545 p->par.pitch);
546 #endif /* CONFIG_BOOTX_TEXT */
547 }
548
549
550 /*
551 * Parse user speficied options (`video=controlfb:')
552 */
553 static void __init control_setup(char *options)
554 {
555 char *this_opt;
556
557 if (!options || !*options)
558 return;
559
560 while ((this_opt = strsep(&options, ",")) != NULL) {
561 if (!strncmp(this_opt, "vmode:", 6)) {
562 int vmode = simple_strtoul(this_opt+6, NULL, 0);
563 if (vmode > 0 && vmode <= VMODE_MAX &&
564 control_mac_modes[vmode - 1].m[1] >= 0)
565 default_vmode = vmode;
566 } else if (!strncmp(this_opt, "cmode:", 6)) {
567 int depth = simple_strtoul(this_opt+6, NULL, 0);
568 switch (depth) {
569 case CMODE_8:
570 case CMODE_16:
571 case CMODE_32:
572 default_cmode = depth;
573 break;
574 case 8:
575 default_cmode = CMODE_8;
576 break;
577 case 15:
578 case 16:
579 default_cmode = CMODE_16;
580 break;
581 case 24:
582 case 32:
583 default_cmode = CMODE_32;
584 break;
585 }
586 }
587 }
588 }
589
590 static int __init control_init(void)
591 {
592 struct device_node *dp;
593 char *option = NULL;
594 int ret = -ENXIO;
595
596 if (fb_get_options("controlfb", &option))
597 return -ENODEV;
598 control_setup(option);
599
600 dp = of_find_node_by_name(NULL, "control");
601 if (dp != 0 && !control_of_init(dp))
602 ret = 0;
603 of_node_put(dp);
604
605 return ret;
606 }
607
608 module_init(control_init);
609
610 /* Work out which banks of VRAM we have installed. */
611 /* danj: I guess the card just ignores writes to nonexistant VRAM... */
612
613 static void __init find_vram_size(struct fb_info_control *p)
614 {
615 int bank1, bank2;
616
617 /*
618 * Set VRAM in 2MB (bank 1) mode
619 * VRAM Bank 2 will be accessible through offset 0x600000 if present
620 * and VRAM Bank 1 will not respond at that offset even if present
621 */
622 out_le32(CNTRL_REG(p,vram_attr), 0x31);
623
624 out_8(&p->frame_buffer[0x600000], 0xb3);
625 out_8(&p->frame_buffer[0x600001], 0x71);
626 asm volatile("eieio; dcbf 0,%0" : : "r" (&p->frame_buffer[0x600000])
627 : "memory" );
628 mb();
629 asm volatile("eieio; dcbi 0,%0" : : "r" (&p->frame_buffer[0x600000])
630 : "memory" );
631 mb();
632
633 bank2 = (in_8(&p->frame_buffer[0x600000]) == 0xb3)
634 && (in_8(&p->frame_buffer[0x600001]) == 0x71);
635
636 /*
637 * Set VRAM in 2MB (bank 2) mode
638 * VRAM Bank 1 will be accessible through offset 0x000000 if present
639 * and VRAM Bank 2 will not respond at that offset even if present
640 */
641 out_le32(CNTRL_REG(p,vram_attr), 0x39);
642
643 out_8(&p->frame_buffer[0], 0x5a);
644 out_8(&p->frame_buffer[1], 0xc7);
645 asm volatile("eieio; dcbf 0,%0" : : "r" (&p->frame_buffer[0])
646 : "memory" );
647 mb();
648 asm volatile("eieio; dcbi 0,%0" : : "r" (&p->frame_buffer[0])
649 : "memory" );
650 mb();
651
652 bank1 = (in_8(&p->frame_buffer[0]) == 0x5a)
653 && (in_8(&p->frame_buffer[1]) == 0xc7);
654
655 if (bank2) {
656 if (!bank1) {
657 /*
658 * vram bank 2 only
659 */
660 p->control_use_bank2 = 1;
661 p->vram_attr = 0x39;
662 p->frame_buffer += 0x600000;
663 p->frame_buffer_phys += 0x600000;
664 } else {
665 /*
666 * 4 MB vram
667 */
668 p->vram_attr = 0x51;
669 }
670 } else {
671 /*
672 * vram bank 1 only
673 */
674 p->vram_attr = 0x31;
675 }
676
677 p->total_vram = (bank1 + bank2) * 0x200000;
678
679 printk(KERN_INFO "controlfb: VRAM Total = %dMB "
680 "(%dMB @ bank 1, %dMB @ bank 2)\n",
681 (bank1 + bank2) << 1, bank1 << 1, bank2 << 1);
682 }
683
684
685 /*
686 * find "control" and initialize
687 */
688 static int __init control_of_init(struct device_node *dp)
689 {
690 struct fb_info_control *p;
691 struct resource fb_res, reg_res;
692
693 if (control_fb) {
694 printk(KERN_ERR "controlfb: only one control is supported\n");
695 return -ENXIO;
696 }
697
698 if (of_pci_address_to_resource(dp, 2, &fb_res) ||
699 of_pci_address_to_resource(dp, 1, &reg_res)) {
700 printk(KERN_ERR "can't get 2 addresses for control\n");
701 return -ENXIO;
702 }
703 p = kzalloc(sizeof(*p), GFP_KERNEL);
704 if (p == 0)
705 return -ENXIO;
706 control_fb = p; /* save it for cleanups */
707
708 /* Map in frame buffer and registers */
709 p->fb_orig_base = fb_res.start;
710 p->fb_orig_size = fb_res.end - fb_res.start + 1;
711 /* use the big-endian aperture (??) */
712 p->frame_buffer_phys = fb_res.start + 0x800000;
713 p->control_regs_phys = reg_res.start;
714 p->control_regs_size = reg_res.end - reg_res.start + 1;
715
716 if (!p->fb_orig_base ||
717 !request_mem_region(p->fb_orig_base,p->fb_orig_size,"controlfb")) {
718 p->fb_orig_base = 0;
719 goto error_out;
720 }
721 /* map at most 8MB for the frame buffer */
722 p->frame_buffer = __ioremap(p->frame_buffer_phys, 0x800000,
723 _PAGE_WRITETHRU);
724
725 if (!p->control_regs_phys ||
726 !request_mem_region(p->control_regs_phys, p->control_regs_size,
727 "controlfb regs")) {
728 p->control_regs_phys = 0;
729 goto error_out;
730 }
731 p->control_regs = ioremap(p->control_regs_phys, p->control_regs_size);
732
733 p->cmap_regs_phys = 0xf301b000; /* XXX not in prom? */
734 if (!request_mem_region(p->cmap_regs_phys, 0x1000, "controlfb cmap")) {
735 p->cmap_regs_phys = 0;
736 goto error_out;
737 }
738 p->cmap_regs = ioremap(p->cmap_regs_phys, 0x1000);
739
740 if (!p->cmap_regs || !p->control_regs || !p->frame_buffer)
741 goto error_out;
742
743 find_vram_size(p);
744 if (!p->total_vram)
745 goto error_out;
746
747 if (init_control(p) < 0)
748 goto error_out;
749
750 return 0;
751
752 error_out:
753 control_cleanup();
754 return -ENXIO;
755 }
756
757 /*
758 * Get the monitor sense value.
759 * Note that this can be called before calibrate_delay,
760 * so we can't use udelay.
761 */
762 static int read_control_sense(struct fb_info_control *p)
763 {
764 int sense;
765
766 out_le32(CNTRL_REG(p,mon_sense), 7); /* drive all lines high */
767 __delay(200);
768 out_le32(CNTRL_REG(p,mon_sense), 077); /* turn off drivers */
769 __delay(2000);
770 sense = (in_le32(CNTRL_REG(p,mon_sense)) & 0x1c0) << 2;
771
772 /* drive each sense line low in turn and collect the other 2 */
773 out_le32(CNTRL_REG(p,mon_sense), 033); /* drive A low */
774 __delay(2000);
775 sense |= (in_le32(CNTRL_REG(p,mon_sense)) & 0xc0) >> 2;
776 out_le32(CNTRL_REG(p,mon_sense), 055); /* drive B low */
777 __delay(2000);
778 sense |= ((in_le32(CNTRL_REG(p,mon_sense)) & 0x100) >> 5)
779 | ((in_le32(CNTRL_REG(p,mon_sense)) & 0x40) >> 4);
780 out_le32(CNTRL_REG(p,mon_sense), 066); /* drive C low */
781 __delay(2000);
782 sense |= (in_le32(CNTRL_REG(p,mon_sense)) & 0x180) >> 7;
783
784 out_le32(CNTRL_REG(p,mon_sense), 077); /* turn off drivers */
785
786 return sense;
787 }
788
789 /********************** Various translation functions **********************/
790
791 #define CONTROL_PIXCLOCK_BASE 256016
792 #define CONTROL_PIXCLOCK_MIN 5000 /* ~ 200 MHz dot clock */
793
794 /*
795 * calculate the clock paramaters to be sent to CUDA according to given
796 * pixclock in pico second.
797 */
798 static int calc_clock_params(unsigned long clk, unsigned char *param)
799 {
800 unsigned long p0, p1, p2, k, l, m, n, min;
801
802 if (clk > (CONTROL_PIXCLOCK_BASE << 3))
803 return 1;
804
805 p2 = ((clk << 4) < CONTROL_PIXCLOCK_BASE)? 3: 2;
806 l = clk << p2;
807 p0 = 0;
808 p1 = 0;
809 for (k = 1, min = l; k < 32; k++) {
810 unsigned long rem;
811
812 m = CONTROL_PIXCLOCK_BASE * k;
813 n = m / l;
814 rem = m % l;
815 if (n && (n < 128) && rem < min) {
816 p0 = k;
817 p1 = n;
818 min = rem;
819 }
820 }
821 if (!p0 || !p1)
822 return 1;
823
824 param[0] = p0;
825 param[1] = p1;
826 param[2] = p2;
827
828 return 0;
829 }
830
831
832 /*
833 * This routine takes a user-supplied var, and picks the best vmode/cmode
834 * from it.
835 */
836
837 static int control_var_to_par(struct fb_var_screeninfo *var,
838 struct fb_par_control *par, const struct fb_info *fb_info)
839 {
840 int cmode, piped_diff, hstep;
841 unsigned hperiod, hssync, hsblank, hesync, heblank, piped, heq, hlfln,
842 hserr, vperiod, vssync, vesync, veblank, vsblank, vswin, vewin;
843 unsigned long pixclock;
844 struct fb_info_control *p = (struct fb_info_control *) fb_info;
845 struct control_regvals *r = &par->regvals;
846
847 switch (var->bits_per_pixel) {
848 case 8:
849 par->cmode = CMODE_8;
850 if (p->total_vram > 0x200000) {
851 r->mode = 3;
852 r->radacal_ctrl = 0x20;
853 piped_diff = 13;
854 } else {
855 r->mode = 2;
856 r->radacal_ctrl = 0x10;
857 piped_diff = 9;
858 }
859 break;
860 case 15:
861 case 16:
862 par->cmode = CMODE_16;
863 if (p->total_vram > 0x200000) {
864 r->mode = 2;
865 r->radacal_ctrl = 0x24;
866 piped_diff = 5;
867 } else {
868 r->mode = 1;
869 r->radacal_ctrl = 0x14;
870 piped_diff = 3;
871 }
872 break;
873 case 32:
874 par->cmode = CMODE_32;
875 if (p->total_vram > 0x200000) {
876 r->mode = 1;
877 r->radacal_ctrl = 0x28;
878 } else {
879 r->mode = 0;
880 r->radacal_ctrl = 0x18;
881 }
882 piped_diff = 1;
883 break;
884 default:
885 return -EINVAL;
886 }
887
888 /*
889 * adjust xres and vxres so that the corresponding memory widths are
890 * 32-byte aligned
891 */
892 hstep = 31 >> par->cmode;
893 par->xres = (var->xres + hstep) & ~hstep;
894 par->vxres = (var->xres_virtual + hstep) & ~hstep;
895 par->xoffset = (var->xoffset + hstep) & ~hstep;
896 if (par->vxres < par->xres)
897 par->vxres = par->xres;
898 par->pitch = par->vxres << par->cmode;
899
900 par->yres = var->yres;
901 par->vyres = var->yres_virtual;
902 par->yoffset = var->yoffset;
903 if (par->vyres < par->yres)
904 par->vyres = par->yres;
905
906 par->sync = var->sync;
907
908 if (par->pitch * par->vyres + CTRLFB_OFF > p->total_vram)
909 return -EINVAL;
910
911 if (par->xoffset + par->xres > par->vxres)
912 par->xoffset = par->vxres - par->xres;
913 if (par->yoffset + par->yres > par->vyres)
914 par->yoffset = par->vyres - par->yres;
915
916 pixclock = (var->pixclock < CONTROL_PIXCLOCK_MIN)? CONTROL_PIXCLOCK_MIN:
917 var->pixclock;
918 if (calc_clock_params(pixclock, r->clock_params))
919 return -EINVAL;
920
921 hperiod = ((var->left_margin + par->xres + var->right_margin
922 + var->hsync_len) >> 1) - 2;
923 hssync = hperiod + 1;
924 hsblank = hssync - (var->right_margin >> 1);
925 hesync = (var->hsync_len >> 1) - 1;
926 heblank = (var->left_margin >> 1) + hesync;
927 piped = heblank - piped_diff;
928 heq = var->hsync_len >> 2;
929 hlfln = (hperiod+2) >> 1;
930 hserr = hssync-hesync;
931 vperiod = (var->vsync_len + var->lower_margin + par->yres
932 + var->upper_margin) << 1;
933 vssync = vperiod - 2;
934 vesync = (var->vsync_len << 1) - vperiod + vssync;
935 veblank = (var->upper_margin << 1) + vesync;
936 vsblank = vssync - (var->lower_margin << 1);
937 vswin = (vsblank+vssync) >> 1;
938 vewin = (vesync+veblank) >> 1;
939
940 r->regs[0] = vswin;
941 r->regs[1] = vsblank;
942 r->regs[2] = veblank;
943 r->regs[3] = vewin;
944 r->regs[4] = vesync;
945 r->regs[5] = vssync;
946 r->regs[6] = vperiod;
947 r->regs[7] = piped;
948 r->regs[8] = hperiod;
949 r->regs[9] = hsblank;
950 r->regs[10] = heblank;
951 r->regs[11] = hesync;
952 r->regs[12] = hssync;
953 r->regs[13] = heq;
954 r->regs[14] = hlfln;
955 r->regs[15] = hserr;
956
957 if (par->xres >= 1280 && par->cmode >= CMODE_16)
958 par->ctrl = 0x7f;
959 else
960 par->ctrl = 0x3b;
961
962 if (mac_var_to_vmode(var, &par->vmode, &cmode))
963 par->vmode = 0;
964
965 return 0;
966 }
967
968
969 /*
970 * Convert hardware data in par to an fb_var_screeninfo
971 */
972
973 static void control_par_to_var(struct fb_par_control *par, struct fb_var_screeninfo *var)
974 {
975 struct control_regints *rv;
976
977 rv = (struct control_regints *) par->regvals.regs;
978
979 memset(var, 0, sizeof(*var));
980 var->xres = par->xres;
981 var->yres = par->yres;
982 var->xres_virtual = par->vxres;
983 var->yres_virtual = par->vyres;
984 var->xoffset = par->xoffset;
985 var->yoffset = par->yoffset;
986
987 switch(par->cmode) {
988 default:
989 case CMODE_8:
990 var->bits_per_pixel = 8;
991 var->red.length = 8;
992 var->green.length = 8;
993 var->blue.length = 8;
994 break;
995 case CMODE_16: /* RGB 555 */
996 var->bits_per_pixel = 16;
997 var->red.offset = 10;
998 var->red.length = 5;
999 var->green.offset = 5;
1000 var->green.length = 5;
1001 var->blue.length = 5;
1002 break;
1003 case CMODE_32: /* RGB 888 */
1004 var->bits_per_pixel = 32;
1005 var->red.offset = 16;
1006 var->red.length = 8;
1007 var->green.offset = 8;
1008 var->green.length = 8;
1009 var->blue.length = 8;
1010 var->transp.offset = 24;
1011 var->transp.length = 8;
1012 break;
1013 }
1014 var->height = -1;
1015 var->width = -1;
1016 var->vmode = FB_VMODE_NONINTERLACED;
1017
1018 var->left_margin = (rv->heblank - rv->hesync) << 1;
1019 var->right_margin = (rv->hssync - rv->hsblank) << 1;
1020 var->hsync_len = (rv->hperiod + 2 - rv->hssync + rv->hesync) << 1;
1021
1022 var->upper_margin = (rv->veblank - rv->vesync) >> 1;
1023 var->lower_margin = (rv->vssync - rv->vsblank) >> 1;
1024 var->vsync_len = (rv->vperiod - rv->vssync + rv->vesync) >> 1;
1025
1026 var->sync = par->sync;
1027
1028 /*
1029 * 10^12 * clock_params[0] / (3906400 * clock_params[1]
1030 * * 2^clock_params[2])
1031 * (10^12 * clock_params[0] / (3906400 * clock_params[1]))
1032 * >> clock_params[2]
1033 */
1034 /* (255990.17 * clock_params[0] / clock_params[1]) >> clock_params[2] */
1035 var->pixclock = CONTROL_PIXCLOCK_BASE * par->regvals.clock_params[0];
1036 var->pixclock /= par->regvals.clock_params[1];
1037 var->pixclock >>= par->regvals.clock_params[2];
1038 }
1039
1040 /*
1041 * Set misc info vars for this driver
1042 */
1043 static void __init control_init_info(struct fb_info *info, struct fb_info_control *p)
1044 {
1045 /* Fill fb_info */
1046 info->par = &p->par;
1047 info->fbops = &controlfb_ops;
1048 info->pseudo_palette = p->pseudo_palette;
1049 info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
1050 info->screen_base = p->frame_buffer + CTRLFB_OFF;
1051
1052 fb_alloc_cmap(&info->cmap, 256, 0);
1053
1054 /* Fill fix common fields */
1055 strcpy(info->fix.id, "control");
1056 info->fix.mmio_start = p->control_regs_phys;
1057 info->fix.mmio_len = sizeof(struct control_regs);
1058 info->fix.type = FB_TYPE_PACKED_PIXELS;
1059 info->fix.smem_start = p->frame_buffer_phys + CTRLFB_OFF;
1060 info->fix.smem_len = p->total_vram - CTRLFB_OFF;
1061 info->fix.ywrapstep = 0;
1062 info->fix.type_aux = 0;
1063 info->fix.accel = FB_ACCEL_NONE;
1064 }
1065
1066
1067 static void control_cleanup(void)
1068 {
1069 struct fb_info_control *p = control_fb;
1070
1071 if (!p)
1072 return;
1073
1074 if (p->cmap_regs)
1075 iounmap(p->cmap_regs);
1076 if (p->control_regs)
1077 iounmap(p->control_regs);
1078 if (p->frame_buffer) {
1079 if (p->control_use_bank2)
1080 p->frame_buffer -= 0x600000;
1081 iounmap(p->frame_buffer);
1082 }
1083 if (p->cmap_regs_phys)
1084 release_mem_region(p->cmap_regs_phys, 0x1000);
1085 if (p->control_regs_phys)
1086 release_mem_region(p->control_regs_phys, p->control_regs_size);
1087 if (p->fb_orig_base)
1088 release_mem_region(p->fb_orig_base, p->fb_orig_size);
1089 kfree(p);
1090 }
1091
1092
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