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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / drivers / video / controlfb.c
blob0c189b32a4c5429f632bb812a784b9a4f8868607
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/of.h>
44 #include <linux/of_address.h>
45 #include <linux/fb.h>
46 #include <linux/init.h>
47 #include <linux/pci.h>
48 #include <linux/nvram.h>
49 #include <linux/adb.h>
50 #include <linux/cuda.h>
51 #include <asm/io.h>
52 #include <asm/prom.h>
53 #include <asm/pgtable.h>
54 #include <asm/btext.h>
55
56 #include "macmodes.h"
57 #include "controlfb.h"
58
59 struct fb_par_control {
60 int vmode, cmode;
61 int xres, yres;
62 int vxres, vyres;
63 int xoffset, yoffset;
64 int pitch;
65 struct control_regvals regvals;
66 unsigned long sync;
67 unsigned char ctrl;
68 };
69
70 #define DIRTY(z) ((x)->z != (y)->z)
71 #define DIRTY_CMAP(z) (memcmp(&((x)->z), &((y)->z), sizeof((y)->z)))
72 static inline int PAR_EQUAL(struct fb_par_control *x, struct fb_par_control *y)
73 {
74 int i, results;
75
76 results = 1;
77 for (i = 0; i < 3; i++)
78 results &= !DIRTY(regvals.clock_params[i]);
79 if (!results)
80 return 0;
81 for (i = 0; i < 16; i++)
82 results &= !DIRTY(regvals.regs[i]);
83 if (!results)
84 return 0;
85 return (!DIRTY(cmode) && !DIRTY(xres) && !DIRTY(yres)
86 && !DIRTY(vxres) && !DIRTY(vyres));
87 }
88 static inline int VAR_MATCH(struct fb_var_screeninfo *x, struct fb_var_screeninfo *y)
89 {
90 return (!DIRTY(bits_per_pixel) && !DIRTY(xres)
91 && !DIRTY(yres) && !DIRTY(xres_virtual)
92 && !DIRTY(yres_virtual)
93 && !DIRTY_CMAP(red) && !DIRTY_CMAP(green) && !DIRTY_CMAP(blue));
94 }
95
96 struct fb_info_control {
97 struct fb_info info;
98 struct fb_par_control par;
99 u32 pseudo_palette[16];
100
101 struct cmap_regs __iomem *cmap_regs;
102 unsigned long cmap_regs_phys;
103
104 struct control_regs __iomem *control_regs;
105 unsigned long control_regs_phys;
106 unsigned long control_regs_size;
107
108 __u8 __iomem *frame_buffer;
109 unsigned long frame_buffer_phys;
110 unsigned long fb_orig_base;
111 unsigned long fb_orig_size;
112
113 int control_use_bank2;
114 unsigned long total_vram;
115 unsigned char vram_attr;
116 };
117
118 /* control register access macro */
119 #define CNTRL_REG(INFO,REG) (&(((INFO)->control_regs->REG).r))
120
121
122 /******************** Prototypes for exported functions ********************/
123 /*
124 * struct fb_ops
125 */
126 static int controlfb_pan_display(struct fb_var_screeninfo *var,
127 struct fb_info *info);
128 static int controlfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
129 u_int transp, struct fb_info *info);
130 static int controlfb_blank(int blank_mode, struct fb_info *info);
131 static int controlfb_mmap(struct fb_info *info,
132 struct vm_area_struct *vma);
133 static int controlfb_set_par (struct fb_info *info);
134 static int controlfb_check_var (struct fb_var_screeninfo *var, struct fb_info *info);
135
136 /******************** Prototypes for internal functions **********************/
137
138 static void set_control_clock(unsigned char *params);
139 static int init_control(struct fb_info_control *p);
140 static void control_set_hardware(struct fb_info_control *p,
141 struct fb_par_control *par);
142 static int control_of_init(struct device_node *dp);
143 static void find_vram_size(struct fb_info_control *p);
144 static int read_control_sense(struct fb_info_control *p);
145 static int calc_clock_params(unsigned long clk, unsigned char *param);
146 static int control_var_to_par(struct fb_var_screeninfo *var,
147 struct fb_par_control *par, const struct fb_info *fb_info);
148 static inline void control_par_to_var(struct fb_par_control *par,
149 struct fb_var_screeninfo *var);
150 static void control_init_info(struct fb_info *info, struct fb_info_control *p);
151 static void control_cleanup(void);
152
153
154 /************************** Internal variables *******************************/
155
156 static struct fb_info_control *control_fb;
157
158 static int default_vmode __initdata = VMODE_NVRAM;
159 static int default_cmode __initdata = CMODE_NVRAM;
160
161
162 static struct fb_ops controlfb_ops = {
163 .owner = THIS_MODULE,
164 .fb_check_var = controlfb_check_var,
165 .fb_set_par = controlfb_set_par,
166 .fb_setcolreg = controlfb_setcolreg,
167 .fb_pan_display = controlfb_pan_display,
168 .fb_blank = controlfb_blank,
169 .fb_mmap = controlfb_mmap,
170 .fb_fillrect = cfb_fillrect,
171 .fb_copyarea = cfb_copyarea,
172 .fb_imageblit = cfb_imageblit,
173 };
174
175
176 /******************** The functions for controlfb_ops ********************/
177
178 #ifdef MODULE
179 MODULE_LICENSE("GPL");
180
181 int init_module(void)
182 {
183 struct device_node *dp;
184 int ret = -ENXIO;
185
186 dp = of_find_node_by_name(NULL, "control");
187 if (dp != 0 && !control_of_init(dp))
188 ret = 0;
189 of_node_put(dp);
190
191 return ret;
192 }
193
194 void cleanup_module(void)
195 {
196 control_cleanup();
197 }
198 #endif
199
200 /*
201 * Checks a var structure
202 */
203 static int controlfb_check_var (struct fb_var_screeninfo *var, struct fb_info *info)
204 {
205 struct fb_par_control par;
206 int err;
207
208 err = control_var_to_par(var, &par, info);
209 if (err)
210 return err;
211 control_par_to_var(&par, var);
212
213 return 0;
214 }
215
216 /*
217 * Applies current var to display
218 */
219 static int controlfb_set_par (struct fb_info *info)
220 {
221 struct fb_info_control *p = (struct fb_info_control *) info;
222 struct fb_par_control par;
223 int err;
224
225 if((err = control_var_to_par(&info->var, &par, info))) {
226 printk (KERN_ERR "controlfb_set_par: error calling"
227 " control_var_to_par: %d.\n", err);
228 return err;
229 }
230
231 control_set_hardware(p, &par);
232
233 info->fix.visual = (p->par.cmode == CMODE_8) ?
234 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_DIRECTCOLOR;
235 info->fix.line_length = p->par.pitch;
236 info->fix.xpanstep = 32 >> p->par.cmode;
237 info->fix.ypanstep = 1;
238
239 return 0;
240 }
241
242 /*
243 * Set screen start address according to var offset values
244 */
245 static inline void set_screen_start(int xoffset, int yoffset,
246 struct fb_info_control *p)
247 {
248 struct fb_par_control *par = &p->par;
249
250 par->xoffset = xoffset;
251 par->yoffset = yoffset;
252 out_le32(CNTRL_REG(p,start_addr),
253 par->yoffset * par->pitch + (par->xoffset << par->cmode));
254 }
255
256
257 static int controlfb_pan_display(struct fb_var_screeninfo *var,
258 struct fb_info *info)
259 {
260 unsigned int xoffset, hstep;
261 struct fb_info_control *p = (struct fb_info_control *)info;
262 struct fb_par_control *par = &p->par;
263
264 /*
265 * make sure start addr will be 32-byte aligned
266 */
267 hstep = 0x1f >> par->cmode;
268 xoffset = (var->xoffset + hstep) & ~hstep;
269
270 if (xoffset+par->xres > par->vxres ||
271 var->yoffset+par->yres > par->vyres)
272 return -EINVAL;
273
274 set_screen_start(xoffset, var->yoffset, p);
275
276 return 0;
277 }
278
279
280 /*
281 * Private mmap since we want to have a different caching on the framebuffer
282 * for controlfb.
283 * Note there's no locking in here; it's done in fb_mmap() in fbmem.c.
284 */
285 static int controlfb_mmap(struct fb_info *info,
286 struct vm_area_struct *vma)
287 {
288 unsigned long off, start;
289 u32 len;
290
291 off = vma->vm_pgoff << PAGE_SHIFT;
292
293 /* frame buffer memory */
294 start = info->fix.smem_start;
295 len = PAGE_ALIGN((start & ~PAGE_MASK)+info->fix.smem_len);
296 if (off >= len) {
297 /* memory mapped io */
298 off -= len;
299 if (info->var.accel_flags)
300 return -EINVAL;
301 start = info->fix.mmio_start;
302 len = PAGE_ALIGN((start & ~PAGE_MASK)+info->fix.mmio_len);
303 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
304 } else {
305 /* framebuffer */
306 vma->vm_page_prot = pgprot_cached_wthru(vma->vm_page_prot);
307 }
308 start &= PAGE_MASK;
309 if ((vma->vm_end - vma->vm_start + off) > len)
310 return -EINVAL;
311 off += start;
312 vma->vm_pgoff = off >> PAGE_SHIFT;
313 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
314 vma->vm_end - vma->vm_start, vma->vm_page_prot))
315 return -EAGAIN;
316
317 return 0;
318 }
319
320 static int controlfb_blank(int blank_mode, struct fb_info *info)
321 {
322 struct fb_info_control *p = (struct fb_info_control *) info;
323 unsigned ctrl;
324
325 ctrl = ld_le32(CNTRL_REG(p,ctrl));
326 if (blank_mode > 0)
327 switch (blank_mode) {
328 case FB_BLANK_VSYNC_SUSPEND:
329 ctrl &= ~3;
330 break;
331 case FB_BLANK_HSYNC_SUSPEND:
332 ctrl &= ~0x30;
333 break;
334 case FB_BLANK_POWERDOWN:
335 ctrl &= ~0x33;
336 /* fall through */
337 case FB_BLANK_NORMAL:
338 ctrl |= 0x400;
339 break;
340 default:
341 break;
342 }
343 else {
344 ctrl &= ~0x400;
345 ctrl |= 0x33;
346 }
347 out_le32(CNTRL_REG(p,ctrl), ctrl);
348
349 return 0;
350 }
351
352 static int controlfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
353 u_int transp, struct fb_info *info)
354 {
355 struct fb_info_control *p = (struct fb_info_control *) info;
356 __u8 r, g, b;
357
358 if (regno > 255)
359 return 1;
360
361 r = red >> 8;
362 g = green >> 8;
363 b = blue >> 8;
364
365 out_8(&p->cmap_regs->addr, regno); /* tell clut what addr to fill */
366 out_8(&p->cmap_regs->lut, r); /* send one color channel at */
367 out_8(&p->cmap_regs->lut, g); /* a time... */
368 out_8(&p->cmap_regs->lut, b);
369
370 if (regno < 16) {
371 int i;
372 switch (p->par.cmode) {
373 case CMODE_16:
374 p->pseudo_palette[regno] =
375 (regno << 10) | (regno << 5) | regno;
376 break;
377 case CMODE_32:
378 i = (regno << 8) | regno;
379 p->pseudo_palette[regno] = (i << 16) | i;
380 break;
381 }
382 }
383
384 return 0;
385 }
386
387
388 /******************** End of controlfb_ops implementation ******************/
389
390
391
392 static void set_control_clock(unsigned char *params)
393 {
394 #ifdef CONFIG_ADB_CUDA
395 struct adb_request req;
396 int i;
397
398 for (i = 0; i < 3; ++i) {
399 cuda_request(&req, NULL, 5, CUDA_PACKET, CUDA_GET_SET_IIC,
400 0x50, i + 1, params[i]);
401 while (!req.complete)
402 cuda_poll();
403 }
404 #endif
405 }
406
407
408 /*
409 * finish off the driver initialization and register
410 */
411 static int __init init_control(struct fb_info_control *p)
412 {
413 int full, sense, vmode, cmode, vyres;
414 struct fb_var_screeninfo var;
415 int rc;
416
417 printk(KERN_INFO "controlfb: ");
418
419 full = p->total_vram == 0x400000;
420
421 /* Try to pick a video mode out of NVRAM if we have one. */
422 #ifdef CONFIG_NVRAM
423 if (default_cmode == CMODE_NVRAM) {
424 cmode = nvram_read_byte(NV_CMODE);
425 if(cmode < CMODE_8 || cmode > CMODE_32)
426 cmode = CMODE_8;
427 } else
428 #endif
429 cmode=default_cmode;
430 #ifdef CONFIG_NVRAM
431 if (default_vmode == VMODE_NVRAM) {
432 vmode = nvram_read_byte(NV_VMODE);
433 if (vmode < 1 || vmode > VMODE_MAX ||
434 control_mac_modes[vmode - 1].m[full] < cmode) {
435 sense = read_control_sense(p);
436 printk("Monitor sense value = 0x%x, ", sense);
437 vmode = mac_map_monitor_sense(sense);
438 if (control_mac_modes[vmode - 1].m[full] < cmode)
439 vmode = VMODE_640_480_60;
440 }
441 } else
442 #endif
443 {
444 vmode=default_vmode;
445 if (control_mac_modes[vmode - 1].m[full] < cmode) {
446 if (cmode > CMODE_8)
447 cmode--;
448 else
449 vmode = VMODE_640_480_60;
450 }
451 }
452
453 /* Initialize info structure */
454 control_init_info(&p->info, p);
455
456 /* Setup default var */
457 if (mac_vmode_to_var(vmode, cmode, &var) < 0) {
458 /* This shouldn't happen! */
459 printk("mac_vmode_to_var(%d, %d,) failed\n", vmode, cmode);
460 try_again:
461 vmode = VMODE_640_480_60;
462 cmode = CMODE_8;
463 if (mac_vmode_to_var(vmode, cmode, &var) < 0) {
464 printk(KERN_ERR "controlfb: mac_vmode_to_var() failed\n");
465 return -ENXIO;
466 }
467 printk(KERN_INFO "controlfb: ");
468 }
469 printk("using video mode %d and color mode %d.\n", vmode, cmode);
470
471 vyres = (p->total_vram - CTRLFB_OFF) / (var.xres << cmode);
472 if (vyres > var.yres)
473 var.yres_virtual = vyres;
474
475 /* Apply default var */
476 var.activate = FB_ACTIVATE_NOW;
477 rc = fb_set_var(&p->info, &var);
478 if (rc && (vmode != VMODE_640_480_60 || cmode != CMODE_8))
479 goto try_again;
480
481 /* Register with fbdev layer */
482 if (register_framebuffer(&p->info) < 0)
483 return -ENXIO;
484
485 printk(KERN_INFO "fb%d: control display adapter\n", p->info.node);
486
487 return 0;
488 }
489
490 #define RADACAL_WRITE(a,d) \
491 out_8(&p->cmap_regs->addr, (a)); \
492 out_8(&p->cmap_regs->dat, (d))
493
494 /* Now how about actually saying, Make it so! */
495 /* Some things in here probably don't need to be done each time. */
496 static void control_set_hardware(struct fb_info_control *p, struct fb_par_control *par)
497 {
498 struct control_regvals *r;
499 volatile struct preg __iomem *rp;
500 int i, cmode;
501
502 if (PAR_EQUAL(&p->par, par)) {
503 /*
504 * check if only xoffset or yoffset differs.
505 * this prevents flickers in typical VT switch case.
506 */
507 if (p->par.xoffset != par->xoffset ||
508 p->par.yoffset != par->yoffset)
509 set_screen_start(par->xoffset, par->yoffset, p);
510
511 return;
512 }
513
514 p->par = *par;
515 cmode = p->par.cmode;
516 r = &par->regvals;
517
518 /* Turn off display */
519 out_le32(CNTRL_REG(p,ctrl), 0x400 | par->ctrl);
520
521 set_control_clock(r->clock_params);
522
523 RADACAL_WRITE(0x20, r->radacal_ctrl);
524 RADACAL_WRITE(0x21, p->control_use_bank2 ? 0 : 1);
525 RADACAL_WRITE(0x10, 0);
526 RADACAL_WRITE(0x11, 0);
527
528 rp = &p->control_regs->vswin;
529 for (i = 0; i < 16; ++i, ++rp)
530 out_le32(&rp->r, r->regs[i]);
531
532 out_le32(CNTRL_REG(p,pitch), par->pitch);
533 out_le32(CNTRL_REG(p,mode), r->mode);
534 out_le32(CNTRL_REG(p,vram_attr), p->vram_attr);
535 out_le32(CNTRL_REG(p,start_addr), par->yoffset * par->pitch
536 + (par->xoffset << cmode));
537 out_le32(CNTRL_REG(p,rfrcnt), 0x1e5);
538 out_le32(CNTRL_REG(p,intr_ena), 0);
539
540 /* Turn on display */
541 out_le32(CNTRL_REG(p,ctrl), par->ctrl);
542
543 #ifdef CONFIG_BOOTX_TEXT
544 btext_update_display(p->frame_buffer_phys + CTRLFB_OFF,
545 p->par.xres, p->par.yres,
546 (cmode == CMODE_32? 32: cmode == CMODE_16? 16: 8),
547 p->par.pitch);
548 #endif /* CONFIG_BOOTX_TEXT */
549 }
550
551
552 /*
553 * Parse user specified options (`video=controlfb:')
554 */
555 static void __init control_setup(char *options)
556 {
557 char *this_opt;
558
559 if (!options || !*options)
560 return;
561
562 while ((this_opt = strsep(&options, ",")) != NULL) {
563 if (!strncmp(this_opt, "vmode:", 6)) {
564 int vmode = simple_strtoul(this_opt+6, NULL, 0);
565 if (vmode > 0 && vmode <= VMODE_MAX &&
566 control_mac_modes[vmode - 1].m[1] >= 0)
567 default_vmode = vmode;
568 } else if (!strncmp(this_opt, "cmode:", 6)) {
569 int depth = simple_strtoul(this_opt+6, NULL, 0);
570 switch (depth) {
571 case CMODE_8:
572 case CMODE_16:
573 case CMODE_32:
574 default_cmode = depth;
575 break;
576 case 8:
577 default_cmode = CMODE_8;
578 break;
579 case 15:
580 case 16:
581 default_cmode = CMODE_16;
582 break;
583 case 24:
584 case 32:
585 default_cmode = CMODE_32;
586 break;
587 }
588 }
589 }
590 }
591
592 static int __init control_init(void)
593 {
594 struct device_node *dp;
595 char *option = NULL;
596 int ret = -ENXIO;
597
598 if (fb_get_options("controlfb", &option))
599 return -ENODEV;
600 control_setup(option);
601
602 dp = of_find_node_by_name(NULL, "control");
603 if (dp != 0 && !control_of_init(dp))
604 ret = 0;
605 of_node_put(dp);
606
607 return ret;
608 }
609
610 module_init(control_init);
611
612 /* Work out which banks of VRAM we have installed. */
613 /* danj: I guess the card just ignores writes to nonexistant VRAM... */
614
615 static void __init find_vram_size(struct fb_info_control *p)
616 {
617 int bank1, bank2;
618
619 /*
620 * Set VRAM in 2MB (bank 1) mode
621 * VRAM Bank 2 will be accessible through offset 0x600000 if present
622 * and VRAM Bank 1 will not respond at that offset even if present
623 */
624 out_le32(CNTRL_REG(p,vram_attr), 0x31);
625
626 out_8(&p->frame_buffer[0x600000], 0xb3);
627 out_8(&p->frame_buffer[0x600001], 0x71);
628 asm volatile("eieio; dcbf 0,%0" : : "r" (&p->frame_buffer[0x600000])
629 : "memory" );
630 mb();
631 asm volatile("eieio; dcbi 0,%0" : : "r" (&p->frame_buffer[0x600000])
632 : "memory" );
633 mb();
634
635 bank2 = (in_8(&p->frame_buffer[0x600000]) == 0xb3)
636 && (in_8(&p->frame_buffer[0x600001]) == 0x71);
637
638 /*
639 * Set VRAM in 2MB (bank 2) mode
640 * VRAM Bank 1 will be accessible through offset 0x000000 if present
641 * and VRAM Bank 2 will not respond at that offset even if present
642 */
643 out_le32(CNTRL_REG(p,vram_attr), 0x39);
644
645 out_8(&p->frame_buffer[0], 0x5a);
646 out_8(&p->frame_buffer[1], 0xc7);
647 asm volatile("eieio; dcbf 0,%0" : : "r" (&p->frame_buffer[0])
648 : "memory" );
649 mb();
650 asm volatile("eieio; dcbi 0,%0" : : "r" (&p->frame_buffer[0])
651 : "memory" );
652 mb();
653
654 bank1 = (in_8(&p->frame_buffer[0]) == 0x5a)
655 && (in_8(&p->frame_buffer[1]) == 0xc7);
656
657 if (bank2) {
658 if (!bank1) {
659 /*
660 * vram bank 2 only
661 */
662 p->control_use_bank2 = 1;
663 p->vram_attr = 0x39;
664 p->frame_buffer += 0x600000;
665 p->frame_buffer_phys += 0x600000;
666 } else {
667 /*
668 * 4 MB vram
669 */
670 p->vram_attr = 0x51;
671 }
672 } else {
673 /*
674 * vram bank 1 only
675 */
676 p->vram_attr = 0x31;
677 }
678
679 p->total_vram = (bank1 + bank2) * 0x200000;
680
681 printk(KERN_INFO "controlfb: VRAM Total = %dMB "
682 "(%dMB @ bank 1, %dMB @ bank 2)\n",
683 (bank1 + bank2) << 1, bank1 << 1, bank2 << 1);
684 }
685
686
687 /*
688 * find "control" and initialize
689 */
690 static int __init control_of_init(struct device_node *dp)
691 {
692 struct fb_info_control *p;
693 struct resource fb_res, reg_res;
694
695 if (control_fb) {
696 printk(KERN_ERR "controlfb: only one control is supported\n");
697 return -ENXIO;
698 }
699
700 if (of_pci_address_to_resource(dp, 2, &fb_res) ||
701 of_pci_address_to_resource(dp, 1, &reg_res)) {
702 printk(KERN_ERR "can't get 2 addresses for control\n");
703 return -ENXIO;
704 }
705 p = kzalloc(sizeof(*p), GFP_KERNEL);
706 if (p == 0)
707 return -ENXIO;
708 control_fb = p; /* save it for cleanups */
709
710 /* Map in frame buffer and registers */
711 p->fb_orig_base = fb_res.start;
712 p->fb_orig_size = resource_size(&fb_res);
713 /* use the big-endian aperture (??) */
714 p->frame_buffer_phys = fb_res.start + 0x800000;
715 p->control_regs_phys = reg_res.start;
716 p->control_regs_size = resource_size(&reg_res);
717
718 if (!p->fb_orig_base ||
719 !request_mem_region(p->fb_orig_base,p->fb_orig_size,"controlfb")) {
720 p->fb_orig_base = 0;
721 goto error_out;
722 }
723 /* map at most 8MB for the frame buffer */
724 p->frame_buffer = __ioremap(p->frame_buffer_phys, 0x800000,
725 _PAGE_WRITETHRU);
726
727 if (!p->control_regs_phys ||
728 !request_mem_region(p->control_regs_phys, p->control_regs_size,
729 "controlfb regs")) {
730 p->control_regs_phys = 0;
731 goto error_out;
732 }
733 p->control_regs = ioremap(p->control_regs_phys, p->control_regs_size);
734
735 p->cmap_regs_phys = 0xf301b000; /* XXX not in prom? */
736 if (!request_mem_region(p->cmap_regs_phys, 0x1000, "controlfb cmap")) {
737 p->cmap_regs_phys = 0;
738 goto error_out;
739 }
740 p->cmap_regs = ioremap(p->cmap_regs_phys, 0x1000);
741
742 if (!p->cmap_regs || !p->control_regs || !p->frame_buffer)
743 goto error_out;
744
745 find_vram_size(p);
746 if (!p->total_vram)
747 goto error_out;
748
749 if (init_control(p) < 0)
750 goto error_out;
751
752 return 0;
753
754 error_out:
755 control_cleanup();
756 return -ENXIO;
757 }
758
759 /*
760 * Get the monitor sense value.
761 * Note that this can be called before calibrate_delay,
762 * so we can't use udelay.
763 */
764 static int read_control_sense(struct fb_info_control *p)
765 {
766 int sense;
767
768 out_le32(CNTRL_REG(p,mon_sense), 7); /* drive all lines high */
769 __delay(200);
770 out_le32(CNTRL_REG(p,mon_sense), 077); /* turn off drivers */
771 __delay(2000);
772 sense = (in_le32(CNTRL_REG(p,mon_sense)) & 0x1c0) << 2;
773
774 /* drive each sense line low in turn and collect the other 2 */
775 out_le32(CNTRL_REG(p,mon_sense), 033); /* drive A low */
776 __delay(2000);
777 sense |= (in_le32(CNTRL_REG(p,mon_sense)) & 0xc0) >> 2;
778 out_le32(CNTRL_REG(p,mon_sense), 055); /* drive B low */
779 __delay(2000);
780 sense |= ((in_le32(CNTRL_REG(p,mon_sense)) & 0x100) >> 5)
781 | ((in_le32(CNTRL_REG(p,mon_sense)) & 0x40) >> 4);
782 out_le32(CNTRL_REG(p,mon_sense), 066); /* drive C low */
783 __delay(2000);
784 sense |= (in_le32(CNTRL_REG(p,mon_sense)) & 0x180) >> 7;
785
786 out_le32(CNTRL_REG(p,mon_sense), 077); /* turn off drivers */
787
788 return sense;
789 }
790
791 /********************** Various translation functions **********************/
792
793 #define CONTROL_PIXCLOCK_BASE 256016
794 #define CONTROL_PIXCLOCK_MIN 5000 /* ~ 200 MHz dot clock */
795
796 /*
797 * calculate the clock paramaters to be sent to CUDA according to given
798 * pixclock in pico second.
799 */
800 static int calc_clock_params(unsigned long clk, unsigned char *param)
801 {
802 unsigned long p0, p1, p2, k, l, m, n, min;
803
804 if (clk > (CONTROL_PIXCLOCK_BASE << 3))
805 return 1;
806
807 p2 = ((clk << 4) < CONTROL_PIXCLOCK_BASE)? 3: 2;
808 l = clk << p2;
809 p0 = 0;
810 p1 = 0;
811 for (k = 1, min = l; k < 32; k++) {
812 unsigned long rem;
813
814 m = CONTROL_PIXCLOCK_BASE * k;
815 n = m / l;
816 rem = m % l;
817 if (n && (n < 128) && rem < min) {
818 p0 = k;
819 p1 = n;
820 min = rem;
821 }
822 }
823 if (!p0 || !p1)
824 return 1;
825
826 param[0] = p0;
827 param[1] = p1;
828 param[2] = p2;
829
830 return 0;
831 }
832
833
834 /*
835 * This routine takes a user-supplied var, and picks the best vmode/cmode
836 * from it.
837 */
838
839 static int control_var_to_par(struct fb_var_screeninfo *var,
840 struct fb_par_control *par, const struct fb_info *fb_info)
841 {
842 int cmode, piped_diff, hstep;
843 unsigned hperiod, hssync, hsblank, hesync, heblank, piped, heq, hlfln,
844 hserr, vperiod, vssync, vesync, veblank, vsblank, vswin, vewin;
845 unsigned long pixclock;
846 struct fb_info_control *p = (struct fb_info_control *) fb_info;
847 struct control_regvals *r = &par->regvals;
848
849 switch (var->bits_per_pixel) {
850 case 8:
851 par->cmode = CMODE_8;
852 if (p->total_vram > 0x200000) {
853 r->mode = 3;
854 r->radacal_ctrl = 0x20;
855 piped_diff = 13;
856 } else {
857 r->mode = 2;
858 r->radacal_ctrl = 0x10;
859 piped_diff = 9;
860 }
861 break;
862 case 15:
863 case 16:
864 par->cmode = CMODE_16;
865 if (p->total_vram > 0x200000) {
866 r->mode = 2;
867 r->radacal_ctrl = 0x24;
868 piped_diff = 5;
869 } else {
870 r->mode = 1;
871 r->radacal_ctrl = 0x14;
872 piped_diff = 3;
873 }
874 break;
875 case 32:
876 par->cmode = CMODE_32;
877 if (p->total_vram > 0x200000) {
878 r->mode = 1;
879 r->radacal_ctrl = 0x28;
880 } else {
881 r->mode = 0;
882 r->radacal_ctrl = 0x18;
883 }
884 piped_diff = 1;
885 break;
886 default:
887 return -EINVAL;
888 }
889
890 /*
891 * adjust xres and vxres so that the corresponding memory widths are
892 * 32-byte aligned
893 */
894 hstep = 31 >> par->cmode;
895 par->xres = (var->xres + hstep) & ~hstep;
896 par->vxres = (var->xres_virtual + hstep) & ~hstep;
897 par->xoffset = (var->xoffset + hstep) & ~hstep;
898 if (par->vxres < par->xres)
899 par->vxres = par->xres;
900 par->pitch = par->vxres << par->cmode;
901
902 par->yres = var->yres;
903 par->vyres = var->yres_virtual;
904 par->yoffset = var->yoffset;
905 if (par->vyres < par->yres)
906 par->vyres = par->yres;
907
908 par->sync = var->sync;
909
910 if (par->pitch * par->vyres + CTRLFB_OFF > p->total_vram)
911 return -EINVAL;
912
913 if (par->xoffset + par->xres > par->vxres)
914 par->xoffset = par->vxres - par->xres;
915 if (par->yoffset + par->yres > par->vyres)
916 par->yoffset = par->vyres - par->yres;
917
918 pixclock = (var->pixclock < CONTROL_PIXCLOCK_MIN)? CONTROL_PIXCLOCK_MIN:
919 var->pixclock;
920 if (calc_clock_params(pixclock, r->clock_params))
921 return -EINVAL;
922
923 hperiod = ((var->left_margin + par->xres + var->right_margin
924 + var->hsync_len) >> 1) - 2;
925 hssync = hperiod + 1;
926 hsblank = hssync - (var->right_margin >> 1);
927 hesync = (var->hsync_len >> 1) - 1;
928 heblank = (var->left_margin >> 1) + hesync;
929 piped = heblank - piped_diff;
930 heq = var->hsync_len >> 2;
931 hlfln = (hperiod+2) >> 1;
932 hserr = hssync-hesync;
933 vperiod = (var->vsync_len + var->lower_margin + par->yres
934 + var->upper_margin) << 1;
935 vssync = vperiod - 2;
936 vesync = (var->vsync_len << 1) - vperiod + vssync;
937 veblank = (var->upper_margin << 1) + vesync;
938 vsblank = vssync - (var->lower_margin << 1);
939 vswin = (vsblank+vssync) >> 1;
940 vewin = (vesync+veblank) >> 1;
941
942 r->regs[0] = vswin;
943 r->regs[1] = vsblank;
944 r->regs[2] = veblank;
945 r->regs[3] = vewin;
946 r->regs[4] = vesync;
947 r->regs[5] = vssync;
948 r->regs[6] = vperiod;
949 r->regs[7] = piped;
950 r->regs[8] = hperiod;
951 r->regs[9] = hsblank;
952 r->regs[10] = heblank;
953 r->regs[11] = hesync;
954 r->regs[12] = hssync;
955 r->regs[13] = heq;
956 r->regs[14] = hlfln;
957 r->regs[15] = hserr;
958
959 if (par->xres >= 1280 && par->cmode >= CMODE_16)
960 par->ctrl = 0x7f;
961 else
962 par->ctrl = 0x3b;
963
964 if (mac_var_to_vmode(var, &par->vmode, &cmode))
965 par->vmode = 0;
966
967 return 0;
968 }
969
970
971 /*
972 * Convert hardware data in par to an fb_var_screeninfo
973 */
974
975 static void control_par_to_var(struct fb_par_control *par, struct fb_var_screeninfo *var)
976 {
977 struct control_regints *rv;
978
979 rv = (struct control_regints *) par->regvals.regs;
980
981 memset(var, 0, sizeof(*var));
982 var->xres = par->xres;
983 var->yres = par->yres;
984 var->xres_virtual = par->vxres;
985 var->yres_virtual = par->vyres;
986 var->xoffset = par->xoffset;
987 var->yoffset = par->yoffset;
988
989 switch(par->cmode) {
990 default:
991 case CMODE_8:
992 var->bits_per_pixel = 8;
993 var->red.length = 8;
994 var->green.length = 8;
995 var->blue.length = 8;
996 break;
997 case CMODE_16: /* RGB 555 */
998 var->bits_per_pixel = 16;
999 var->red.offset = 10;
1000 var->red.length = 5;
1001 var->green.offset = 5;
1002 var->green.length = 5;
1003 var->blue.length = 5;
1004 break;
1005 case CMODE_32: /* RGB 888 */
1006 var->bits_per_pixel = 32;
1007 var->red.offset = 16;
1008 var->red.length = 8;
1009 var->green.offset = 8;
1010 var->green.length = 8;
1011 var->blue.length = 8;
1012 var->transp.offset = 24;
1013 var->transp.length = 8;
1014 break;
1015 }
1016 var->height = -1;
1017 var->width = -1;
1018 var->vmode = FB_VMODE_NONINTERLACED;
1019
1020 var->left_margin = (rv->heblank - rv->hesync) << 1;
1021 var->right_margin = (rv->hssync - rv->hsblank) << 1;
1022 var->hsync_len = (rv->hperiod + 2 - rv->hssync + rv->hesync) << 1;
1023
1024 var->upper_margin = (rv->veblank - rv->vesync) >> 1;
1025 var->lower_margin = (rv->vssync - rv->vsblank) >> 1;
1026 var->vsync_len = (rv->vperiod - rv->vssync + rv->vesync) >> 1;
1027
1028 var->sync = par->sync;
1029
1030 /*
1031 * 10^12 * clock_params[0] / (3906400 * clock_params[1]
1032 * * 2^clock_params[2])
1033 * (10^12 * clock_params[0] / (3906400 * clock_params[1]))
1034 * >> clock_params[2]
1035 */
1036 /* (255990.17 * clock_params[0] / clock_params[1]) >> clock_params[2] */
1037 var->pixclock = CONTROL_PIXCLOCK_BASE * par->regvals.clock_params[0];
1038 var->pixclock /= par->regvals.clock_params[1];
1039 var->pixclock >>= par->regvals.clock_params[2];
1040 }
1041
1042 /*
1043 * Set misc info vars for this driver
1044 */
1045 static void __init control_init_info(struct fb_info *info, struct fb_info_control *p)
1046 {
1047 /* Fill fb_info */
1048 info->par = &p->par;
1049 info->fbops = &controlfb_ops;
1050 info->pseudo_palette = p->pseudo_palette;
1051 info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
1052 info->screen_base = p->frame_buffer + CTRLFB_OFF;
1053
1054 fb_alloc_cmap(&info->cmap, 256, 0);
1055
1056 /* Fill fix common fields */
1057 strcpy(info->fix.id, "control");
1058 info->fix.mmio_start = p->control_regs_phys;
1059 info->fix.mmio_len = sizeof(struct control_regs);
1060 info->fix.type = FB_TYPE_PACKED_PIXELS;
1061 info->fix.smem_start = p->frame_buffer_phys + CTRLFB_OFF;
1062 info->fix.smem_len = p->total_vram - CTRLFB_OFF;
1063 info->fix.ywrapstep = 0;
1064 info->fix.type_aux = 0;
1065 info->fix.accel = FB_ACCEL_NONE;
1066 }
1067
1068
1069 static void control_cleanup(void)
1070 {
1071 struct fb_info_control *p = control_fb;
1072
1073 if (!p)
1074 return;
1075
1076 if (p->cmap_regs)
1077 iounmap(p->cmap_regs);
1078 if (p->control_regs)
1079 iounmap(p->control_regs);
1080 if (p->frame_buffer) {
1081 if (p->control_use_bank2)
1082 p->frame_buffer -= 0x600000;
1083 iounmap(p->frame_buffer);
1084 }
1085 if (p->cmap_regs_phys)
1086 release_mem_region(p->cmap_regs_phys, 0x1000);
1087 if (p->control_regs_phys)
1088 release_mem_region(p->control_regs_phys, p->control_regs_size);
1089 if (p->fb_orig_base)
1090 release_mem_region(p->fb_orig_base, p->fb_orig_size);
1091 kfree(p);
1092 }
1093
1094