[PATCH] nvidiafb: Use generic DDC reading
[linux-2.6] / drivers / video / sgivwfb.c
1 /*
2  *  linux/drivers/video/sgivwfb.c -- SGI DBE frame buffer device
3  *
4  *      Copyright (C) 1999 Silicon Graphics, Inc.
5  *      Jeffrey Newquist, newquist@engr.sgi.som
6  *
7  *  This file is subject to the terms and conditions of the GNU General Public
8  *  License. See the file COPYING in the main directory of this archive for
9  *  more details.
10  */
11
12 #include <linux/module.h>
13 #include <linux/kernel.h>
14 #include <linux/mm.h>
15 #include <linux/errno.h>
16 #include <linux/delay.h>
17 #include <linux/fb.h>
18 #include <linux/init.h>
19 #include <linux/ioport.h>
20 #include <linux/platform_device.h>
21
22 #include <asm/io.h>
23 #include <asm/mtrr.h>
24
25 #include <setup_arch.h>
26
27 #define INCLUDE_TIMING_TABLE_DATA
28 #define DBE_REG_BASE par->regs
29 #include <video/sgivw.h>
30
31 struct sgivw_par {
32         struct asregs *regs;
33         u32 cmap_fifo;
34         u_long timing_num;
35 };
36
37 #define FLATPANEL_SGI_1600SW    5
38
39 /*
40  *  RAM we reserve for the frame buffer. This defines the maximum screen
41  *  size
42  *
43  *  The default can be overridden if the driver is compiled as a module
44  */
45
46 static int ypan = 0;
47 static int ywrap = 0;
48
49 static int flatpanel_id = -1;
50
51 static struct fb_fix_screeninfo sgivwfb_fix __initdata = {
52         .id             = "SGI Vis WS FB",
53         .type           = FB_TYPE_PACKED_PIXELS,
54         .visual         = FB_VISUAL_PSEUDOCOLOR,
55         .mmio_start     = DBE_REG_PHYS,
56         .mmio_len       = DBE_REG_SIZE,
57         .accel          = FB_ACCEL_NONE,
58         .line_length    = 640,
59 };
60
61 static struct fb_var_screeninfo sgivwfb_var __initdata = {
62         /* 640x480, 8 bpp */
63         .xres           = 640,
64         .yres           = 480,
65         .xres_virtual   = 640,
66         .yres_virtual   = 480,
67         .bits_per_pixel = 8,
68         .red            = { 0, 8, 0 },
69         .green          = { 0, 8, 0 },
70         .blue           = { 0, 8, 0 },
71         .height         = -1,
72         .width          = -1,
73         .pixclock       = 20000,
74         .left_margin    = 64,
75         .right_margin   = 64,
76         .upper_margin   = 32,
77         .lower_margin   = 32,
78         .hsync_len      = 64,
79         .vsync_len      = 2,
80         .vmode          = FB_VMODE_NONINTERLACED
81 };
82
83 static struct fb_var_screeninfo sgivwfb_var1600sw __initdata = {
84         /* 1600x1024, 8 bpp */
85         .xres           = 1600,
86         .yres           = 1024,
87         .xres_virtual   = 1600,
88         .yres_virtual   = 1024,
89         .bits_per_pixel = 8,
90         .red            = { 0, 8, 0 },
91         .green          = { 0, 8, 0 },
92         .blue           = { 0, 8, 0 },
93         .height         = -1,
94         .width          = -1,
95         .pixclock       = 9353,
96         .left_margin    = 20,
97         .right_margin   = 30,
98         .upper_margin   = 37,
99         .lower_margin   = 3,
100         .hsync_len      = 20,
101         .vsync_len      = 3,
102         .vmode          = FB_VMODE_NONINTERLACED
103 };
104
105 /*
106  *  Interface used by the world
107  */
108 int sgivwfb_init(void);
109
110 static int sgivwfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info);
111 static int sgivwfb_set_par(struct fb_info *info);
112 static int sgivwfb_setcolreg(u_int regno, u_int red, u_int green,
113                              u_int blue, u_int transp,
114                              struct fb_info *info);
115 static int sgivwfb_mmap(struct fb_info *info,
116                         struct vm_area_struct *vma);
117
118 static struct fb_ops sgivwfb_ops = {
119         .owner          = THIS_MODULE,
120         .fb_check_var   = sgivwfb_check_var,
121         .fb_set_par     = sgivwfb_set_par,
122         .fb_setcolreg   = sgivwfb_setcolreg,
123         .fb_fillrect    = cfb_fillrect,
124         .fb_copyarea    = cfb_copyarea,
125         .fb_imageblit   = cfb_imageblit,
126         .fb_mmap        = sgivwfb_mmap,
127 };
128
129 /*
130  *  Internal routines
131  */
132 static unsigned long bytes_per_pixel(int bpp)
133 {
134         switch (bpp) {
135                 case 8:
136                         return 1;
137                 case 16:
138                         return 2;
139                 case 32:
140                         return 4;
141                 default:
142                         printk(KERN_INFO "sgivwfb: unsupported bpp %d\n", bpp);
143                         return 0;
144         }
145 }
146
147 static unsigned long get_line_length(int xres_virtual, int bpp)
148 {
149         return (xres_virtual * bytes_per_pixel(bpp));
150 }
151
152 /*
153  * Function:    dbe_TurnOffDma
154  * Parameters:  (None)
155  * Description: This should turn off the monitor and dbe.  This is used
156  *              when switching between the serial console and the graphics
157  *              console.
158  */
159
160 static void dbe_TurnOffDma(struct sgivw_par *par)
161 {
162         unsigned int readVal;
163         int i;
164
165         // Check to see if things are already turned off:
166         // 1) Check to see if dbe is not using the internal dotclock.
167         // 2) Check to see if the xy counter in dbe is already off.
168
169         DBE_GETREG(ctrlstat, readVal);
170         if (GET_DBE_FIELD(CTRLSTAT, PCLKSEL, readVal) < 2)
171                 return;
172
173         DBE_GETREG(vt_xy, readVal);
174         if (GET_DBE_FIELD(VT_XY, VT_FREEZE, readVal) == 1)
175                 return;
176
177         // Otherwise, turn off dbe
178
179         DBE_GETREG(ovr_control, readVal);
180         SET_DBE_FIELD(OVR_CONTROL, OVR_DMA_ENABLE, readVal, 0);
181         DBE_SETREG(ovr_control, readVal);
182         udelay(1000);
183         DBE_GETREG(frm_control, readVal);
184         SET_DBE_FIELD(FRM_CONTROL, FRM_DMA_ENABLE, readVal, 0);
185         DBE_SETREG(frm_control, readVal);
186         udelay(1000);
187         DBE_GETREG(did_control, readVal);
188         SET_DBE_FIELD(DID_CONTROL, DID_DMA_ENABLE, readVal, 0);
189         DBE_SETREG(did_control, readVal);
190         udelay(1000);
191
192         // XXX HACK:
193         //
194         //    This was necessary for GBE--we had to wait through two
195         //    vertical retrace periods before the pixel DMA was
196         //    turned off for sure.  I've left this in for now, in
197         //    case dbe needs it.
198
199         for (i = 0; i < 10000; i++) {
200                 DBE_GETREG(frm_inhwctrl, readVal);
201                 if (GET_DBE_FIELD(FRM_INHWCTRL, FRM_DMA_ENABLE, readVal) ==
202                     0)
203                         udelay(10);
204                 else {
205                         DBE_GETREG(ovr_inhwctrl, readVal);
206                         if (GET_DBE_FIELD
207                             (OVR_INHWCTRL, OVR_DMA_ENABLE, readVal) == 0)
208                                 udelay(10);
209                         else {
210                                 DBE_GETREG(did_inhwctrl, readVal);
211                                 if (GET_DBE_FIELD
212                                     (DID_INHWCTRL, DID_DMA_ENABLE,
213                                      readVal) == 0)
214                                         udelay(10);
215                                 else
216                                         break;
217                         }
218                 }
219         }
220 }
221
222 /*
223  *  Set the User Defined Part of the Display. Again if par use it to get
224  *  real video mode.
225  */
226 static int sgivwfb_check_var(struct fb_var_screeninfo *var, 
227                              struct fb_info *info)
228 {
229         struct sgivw_par *par = (struct sgivw_par *)info->par;
230         struct dbe_timing_info *timing;
231         u_long line_length;
232         u_long min_mode;
233         int req_dot;
234         int test_mode;
235
236         /*
237          *  FB_VMODE_CONUPDATE and FB_VMODE_SMOOTH_XPAN are equal!
238          *  as FB_VMODE_SMOOTH_XPAN is only used internally
239          */
240
241         if (var->vmode & FB_VMODE_CONUPDATE) {
242                 var->vmode |= FB_VMODE_YWRAP;
243                 var->xoffset = info->var.xoffset;
244                 var->yoffset = info->var.yoffset;
245         }
246
247         /* XXX FIXME - forcing var's */
248         var->xoffset = 0;
249         var->yoffset = 0;
250
251         /* Limit bpp to 8, 16, and 32 */
252         if (var->bits_per_pixel <= 8)
253                 var->bits_per_pixel = 8;
254         else if (var->bits_per_pixel <= 16)
255                 var->bits_per_pixel = 16;
256         else if (var->bits_per_pixel <= 32)
257                 var->bits_per_pixel = 32;
258         else
259                 return -EINVAL;
260
261         var->grayscale = 0;     /* No grayscale for now */
262
263         /* determine valid resolution and timing */
264         for (min_mode = 0; min_mode < DBE_VT_SIZE; min_mode++) {
265                 if (dbeVTimings[min_mode].width >= var->xres &&
266                     dbeVTimings[min_mode].height >= var->yres)
267                         break;
268         }
269
270         if (min_mode == DBE_VT_SIZE)
271                 return -EINVAL; /* Resolution to high */
272
273         /* XXX FIXME - should try to pick best refresh rate */
274         /* for now, pick closest dot-clock within 3MHz */
275         req_dot = PICOS2KHZ(var->pixclock);
276         printk(KERN_INFO "sgivwfb: requested pixclock=%d ps (%d KHz)\n",
277                var->pixclock, req_dot);
278         test_mode = min_mode;
279         while (dbeVTimings[min_mode].width == dbeVTimings[test_mode].width) {
280                 if (dbeVTimings[test_mode].cfreq + 3000 > req_dot)
281                         break;
282                 test_mode++;
283         }
284         if (dbeVTimings[min_mode].width != dbeVTimings[test_mode].width)
285                 test_mode--;
286         min_mode = test_mode;
287         timing = &dbeVTimings[min_mode];
288         printk(KERN_INFO "sgivwfb: granted dot-clock=%d KHz\n", timing->cfreq);
289
290         /* Adjust virtual resolution, if necessary */
291         if (var->xres > var->xres_virtual || (!ywrap && !ypan))
292                 var->xres_virtual = var->xres;
293         if (var->yres > var->yres_virtual || (!ywrap && !ypan))
294                 var->yres_virtual = var->yres;
295
296         /*
297          *  Memory limit
298          */
299         line_length = get_line_length(var->xres_virtual, var->bits_per_pixel);
300         if (line_length * var->yres_virtual > sgivwfb_mem_size)
301                 return -ENOMEM; /* Virtual resolution to high */
302
303         info->fix.line_length = line_length;
304
305         switch (var->bits_per_pixel) {
306         case 8:
307                 var->red.offset = 0;
308                 var->red.length = 8;
309                 var->green.offset = 0;
310                 var->green.length = 8;
311                 var->blue.offset = 0;
312                 var->blue.length = 8;
313                 var->transp.offset = 0;
314                 var->transp.length = 0;
315                 break;
316         case 16:                /* RGBA 5551 */
317                 var->red.offset = 11;
318                 var->red.length = 5;
319                 var->green.offset = 6;
320                 var->green.length = 5;
321                 var->blue.offset = 1;
322                 var->blue.length = 5;
323                 var->transp.offset = 0;
324                 var->transp.length = 0;
325                 break;
326         case 32:                /* RGB 8888 */
327                 var->red.offset = 0;
328                 var->red.length = 8;
329                 var->green.offset = 8;
330                 var->green.length = 8;
331                 var->blue.offset = 16;
332                 var->blue.length = 8;
333                 var->transp.offset = 24;
334                 var->transp.length = 8;
335                 break;
336         }
337         var->red.msb_right = 0;
338         var->green.msb_right = 0;
339         var->blue.msb_right = 0;
340         var->transp.msb_right = 0;
341
342         /* set video timing information */
343         var->pixclock = KHZ2PICOS(timing->cfreq);
344         var->left_margin = timing->htotal - timing->hsync_end;
345         var->right_margin = timing->hsync_start - timing->width;
346         var->upper_margin = timing->vtotal - timing->vsync_end;
347         var->lower_margin = timing->vsync_start - timing->height;
348         var->hsync_len = timing->hsync_end - timing->hsync_start;
349         var->vsync_len = timing->vsync_end - timing->vsync_start;
350
351         /* Ouch. This breaks the rules but timing_num is only important if you
352         * change a video mode */
353         par->timing_num = min_mode;
354
355         printk(KERN_INFO "sgivwfb: new video mode xres=%d yres=%d bpp=%d\n",
356                 var->xres, var->yres, var->bits_per_pixel);
357         printk(KERN_INFO "         vxres=%d vyres=%d\n", var->xres_virtual,
358                 var->yres_virtual);
359         return 0;
360 }
361
362 /*
363  *  Setup flatpanel related registers.
364  */
365 static void sgivwfb_setup_flatpanel(struct sgivw_par *par, struct dbe_timing_info *currentTiming)
366 {
367         int fp_wid, fp_hgt, fp_vbs, fp_vbe;
368         u32 outputVal = 0;
369
370         SET_DBE_FIELD(VT_FLAGS, HDRV_INVERT, outputVal, 
371                 (currentTiming->flags & FB_SYNC_HOR_HIGH_ACT) ? 0 : 1);
372         SET_DBE_FIELD(VT_FLAGS, VDRV_INVERT, outputVal, 
373                 (currentTiming->flags & FB_SYNC_VERT_HIGH_ACT) ? 0 : 1);
374         DBE_SETREG(vt_flags, outputVal);
375
376         /* Turn on the flat panel */
377         switch (flatpanel_id) {
378                 case FLATPANEL_SGI_1600SW:
379                         fp_wid = 1600;
380                         fp_hgt = 1024;
381                         fp_vbs = 0;
382                         fp_vbe = 1600;
383                         currentTiming->pll_m = 4;
384                         currentTiming->pll_n = 1;
385                         currentTiming->pll_p = 0;
386                         break;
387                 default:
388                         fp_wid = fp_hgt = fp_vbs = fp_vbe = 0xfff;
389         }
390
391         outputVal = 0;
392         SET_DBE_FIELD(FP_DE, FP_DE_ON, outputVal, fp_vbs);
393         SET_DBE_FIELD(FP_DE, FP_DE_OFF, outputVal, fp_vbe);
394         DBE_SETREG(fp_de, outputVal);
395         outputVal = 0;
396         SET_DBE_FIELD(FP_HDRV, FP_HDRV_OFF, outputVal, fp_wid);
397         DBE_SETREG(fp_hdrv, outputVal);
398         outputVal = 0;
399         SET_DBE_FIELD(FP_VDRV, FP_VDRV_ON, outputVal, 1);
400         SET_DBE_FIELD(FP_VDRV, FP_VDRV_OFF, outputVal, fp_hgt + 1);
401         DBE_SETREG(fp_vdrv, outputVal);
402 }
403
404 /*
405  *  Set the hardware according to 'par'.
406  */
407 static int sgivwfb_set_par(struct fb_info *info)
408 {
409         struct sgivw_par *par = info->par;
410         int i, j, htmp, temp;
411         u32 readVal, outputVal;
412         int wholeTilesX, maxPixelsPerTileX;
413         int frmWrite1, frmWrite2, frmWrite3b;
414         struct dbe_timing_info *currentTiming; /* Current Video Timing */
415         int xpmax, ypmax;       // Monitor resolution
416         int bytesPerPixel;      // Bytes per pixel
417
418         currentTiming = &dbeVTimings[par->timing_num];
419         bytesPerPixel = bytes_per_pixel(info->var.bits_per_pixel);
420         xpmax = currentTiming->width;
421         ypmax = currentTiming->height;
422
423         /* dbe_InitGraphicsBase(); */
424         /* Turn on dotclock PLL */
425         DBE_SETREG(ctrlstat, 0x20000000);
426
427         dbe_TurnOffDma(par);
428
429         /* dbe_CalculateScreenParams(); */
430         maxPixelsPerTileX = 512 / bytesPerPixel;
431         wholeTilesX = xpmax / maxPixelsPerTileX;
432         if (wholeTilesX * maxPixelsPerTileX < xpmax)
433                 wholeTilesX++;
434
435         printk(KERN_DEBUG "sgivwfb: pixPerTile=%d wholeTilesX=%d\n",
436                maxPixelsPerTileX, wholeTilesX);
437
438         /* dbe_InitGammaMap(); */
439         udelay(10);
440
441         for (i = 0; i < 256; i++) {
442                 DBE_ISETREG(gmap, i, (i << 24) | (i << 16) | (i << 8));
443         }
444
445         /* dbe_TurnOn(); */
446         DBE_GETREG(vt_xy, readVal);
447         if (GET_DBE_FIELD(VT_XY, VT_FREEZE, readVal) == 1) {
448                 DBE_SETREG(vt_xy, 0x00000000);
449                 udelay(1);
450         } else
451                 dbe_TurnOffDma(par);
452
453         /* dbe_Initdbe(); */
454         for (i = 0; i < 256; i++) {
455                 for (j = 0; j < 100; j++) {
456                         DBE_GETREG(cm_fifo, readVal);
457                         if (readVal != 0x00000000)
458                                 break;
459                         else
460                                 udelay(10);
461                 }
462
463                 // DBE_ISETREG(cmap, i, 0x00000000);
464                 DBE_ISETREG(cmap, i, (i << 8) | (i << 16) | (i << 24));
465         }
466
467         /* dbe_InitFramebuffer(); */
468         frmWrite1 = 0;
469         SET_DBE_FIELD(FRM_SIZE_TILE, FRM_WIDTH_TILE, frmWrite1,
470                       wholeTilesX);
471         SET_DBE_FIELD(FRM_SIZE_TILE, FRM_RHS, frmWrite1, 0);
472
473         switch (bytesPerPixel) {
474         case 1:
475                 SET_DBE_FIELD(FRM_SIZE_TILE, FRM_DEPTH, frmWrite1,
476                               DBE_FRM_DEPTH_8);
477                 break;
478         case 2:
479                 SET_DBE_FIELD(FRM_SIZE_TILE, FRM_DEPTH, frmWrite1,
480                               DBE_FRM_DEPTH_16);
481                 break;
482         case 4:
483                 SET_DBE_FIELD(FRM_SIZE_TILE, FRM_DEPTH, frmWrite1,
484                               DBE_FRM_DEPTH_32);
485                 break;
486         }
487
488         frmWrite2 = 0;
489         SET_DBE_FIELD(FRM_SIZE_PIXEL, FB_HEIGHT_PIX, frmWrite2, ypmax);
490
491         // Tell dbe about the framebuffer location and type
492         // XXX What format is the FRM_TILE_PTR??  64K aligned address?
493         frmWrite3b = 0;
494         SET_DBE_FIELD(FRM_CONTROL, FRM_TILE_PTR, frmWrite3b,
495                       sgivwfb_mem_phys >> 9);
496         SET_DBE_FIELD(FRM_CONTROL, FRM_DMA_ENABLE, frmWrite3b, 1);
497         SET_DBE_FIELD(FRM_CONTROL, FRM_LINEAR, frmWrite3b, 1);
498
499         /* Initialize DIDs */
500
501         outputVal = 0;
502         switch (bytesPerPixel) {
503         case 1:
504                 SET_DBE_FIELD(WID, TYP, outputVal, DBE_CMODE_I8);
505                 break;
506         case 2:
507                 SET_DBE_FIELD(WID, TYP, outputVal, DBE_CMODE_RGBA5);
508                 break;
509         case 4:
510                 SET_DBE_FIELD(WID, TYP, outputVal, DBE_CMODE_RGB8);
511                 break;
512         }
513         SET_DBE_FIELD(WID, BUF, outputVal, DBE_BMODE_BOTH);
514
515         for (i = 0; i < 32; i++) {
516                 DBE_ISETREG(mode_regs, i, outputVal);
517         }
518
519         /* dbe_InitTiming(); */
520         DBE_SETREG(vt_intr01, 0xffffffff);
521         DBE_SETREG(vt_intr23, 0xffffffff);
522
523         DBE_GETREG(dotclock, readVal);
524         DBE_SETREG(dotclock, readVal & 0xffff);
525
526         DBE_SETREG(vt_xymax, 0x00000000);
527         outputVal = 0;
528         SET_DBE_FIELD(VT_VSYNC, VT_VSYNC_ON, outputVal,
529                       currentTiming->vsync_start);
530         SET_DBE_FIELD(VT_VSYNC, VT_VSYNC_OFF, outputVal,
531                       currentTiming->vsync_end);
532         DBE_SETREG(vt_vsync, outputVal);
533         outputVal = 0;
534         SET_DBE_FIELD(VT_HSYNC, VT_HSYNC_ON, outputVal,
535                       currentTiming->hsync_start);
536         SET_DBE_FIELD(VT_HSYNC, VT_HSYNC_OFF, outputVal,
537                       currentTiming->hsync_end);
538         DBE_SETREG(vt_hsync, outputVal);
539         outputVal = 0;
540         SET_DBE_FIELD(VT_VBLANK, VT_VBLANK_ON, outputVal,
541                       currentTiming->vblank_start);
542         SET_DBE_FIELD(VT_VBLANK, VT_VBLANK_OFF, outputVal,
543                       currentTiming->vblank_end);
544         DBE_SETREG(vt_vblank, outputVal);
545         outputVal = 0;
546         SET_DBE_FIELD(VT_HBLANK, VT_HBLANK_ON, outputVal,
547                       currentTiming->hblank_start);
548         SET_DBE_FIELD(VT_HBLANK, VT_HBLANK_OFF, outputVal,
549                       currentTiming->hblank_end - 3);
550         DBE_SETREG(vt_hblank, outputVal);
551         outputVal = 0;
552         SET_DBE_FIELD(VT_VCMAP, VT_VCMAP_ON, outputVal,
553                       currentTiming->vblank_start);
554         SET_DBE_FIELD(VT_VCMAP, VT_VCMAP_OFF, outputVal,
555                       currentTiming->vblank_end);
556         DBE_SETREG(vt_vcmap, outputVal);
557         outputVal = 0;
558         SET_DBE_FIELD(VT_HCMAP, VT_HCMAP_ON, outputVal,
559                       currentTiming->hblank_start);
560         SET_DBE_FIELD(VT_HCMAP, VT_HCMAP_OFF, outputVal,
561                       currentTiming->hblank_end - 3);
562         DBE_SETREG(vt_hcmap, outputVal);
563
564         if (flatpanel_id != -1)
565                 sgivwfb_setup_flatpanel(par, currentTiming);
566
567         outputVal = 0;
568         temp = currentTiming->vblank_start - currentTiming->vblank_end - 1;
569         if (temp > 0)
570                 temp = -temp;
571
572         SET_DBE_FIELD(DID_START_XY, DID_STARTY, outputVal, (u32) temp);
573         if (currentTiming->hblank_end >= 20)
574                 SET_DBE_FIELD(DID_START_XY, DID_STARTX, outputVal,
575                               currentTiming->hblank_end - 20);
576         else
577                 SET_DBE_FIELD(DID_START_XY, DID_STARTX, outputVal,
578                               currentTiming->htotal - (20 -
579                                                        currentTiming->
580                                                        hblank_end));
581         DBE_SETREG(did_start_xy, outputVal);
582
583         outputVal = 0;
584         SET_DBE_FIELD(CRS_START_XY, CRS_STARTY, outputVal,
585                       (u32) (temp + 1));
586         if (currentTiming->hblank_end >= DBE_CRS_MAGIC)
587                 SET_DBE_FIELD(CRS_START_XY, CRS_STARTX, outputVal,
588                               currentTiming->hblank_end - DBE_CRS_MAGIC);
589         else
590                 SET_DBE_FIELD(CRS_START_XY, CRS_STARTX, outputVal,
591                               currentTiming->htotal - (DBE_CRS_MAGIC -
592                                                        currentTiming->
593                                                        hblank_end));
594         DBE_SETREG(crs_start_xy, outputVal);
595
596         outputVal = 0;
597         SET_DBE_FIELD(VC_START_XY, VC_STARTY, outputVal, (u32) temp);
598         SET_DBE_FIELD(VC_START_XY, VC_STARTX, outputVal,
599                       currentTiming->hblank_end - 4);
600         DBE_SETREG(vc_start_xy, outputVal);
601
602         DBE_SETREG(frm_size_tile, frmWrite1);
603         DBE_SETREG(frm_size_pixel, frmWrite2);
604
605         outputVal = 0;
606         SET_DBE_FIELD(DOTCLK, M, outputVal, currentTiming->pll_m - 1);
607         SET_DBE_FIELD(DOTCLK, N, outputVal, currentTiming->pll_n - 1);
608         SET_DBE_FIELD(DOTCLK, P, outputVal, currentTiming->pll_p);
609         SET_DBE_FIELD(DOTCLK, RUN, outputVal, 1);
610         DBE_SETREG(dotclock, outputVal);
611
612         udelay(11 * 1000);
613
614         DBE_SETREG(vt_vpixen, 0xffffff);
615         DBE_SETREG(vt_hpixen, 0xffffff);
616
617         outputVal = 0;
618         SET_DBE_FIELD(VT_XYMAX, VT_MAXX, outputVal, currentTiming->htotal);
619         SET_DBE_FIELD(VT_XYMAX, VT_MAXY, outputVal, currentTiming->vtotal);
620         DBE_SETREG(vt_xymax, outputVal);
621
622         outputVal = frmWrite1;
623         SET_DBE_FIELD(FRM_SIZE_TILE, FRM_FIFO_RESET, outputVal, 1);
624         DBE_SETREG(frm_size_tile, outputVal);
625         DBE_SETREG(frm_size_tile, frmWrite1);
626
627         outputVal = 0;
628         SET_DBE_FIELD(OVR_WIDTH_TILE, OVR_FIFO_RESET, outputVal, 1);
629         DBE_SETREG(ovr_width_tile, outputVal);
630         DBE_SETREG(ovr_width_tile, 0);
631
632         DBE_SETREG(frm_control, frmWrite3b);
633         DBE_SETREG(did_control, 0);
634
635         // Wait for dbe to take frame settings
636         for (i = 0; i < 100000; i++) {
637                 DBE_GETREG(frm_inhwctrl, readVal);
638                 if (GET_DBE_FIELD(FRM_INHWCTRL, FRM_DMA_ENABLE, readVal) !=
639                     0)
640                         break;
641                 else
642                         udelay(1);
643         }
644
645         if (i == 100000)
646                 printk(KERN_INFO
647                        "sgivwfb: timeout waiting for frame DMA enable.\n");
648
649         outputVal = 0;
650         htmp = currentTiming->hblank_end - 19;
651         if (htmp < 0)
652                 htmp += currentTiming->htotal;  /* allow blank to wrap around */
653         SET_DBE_FIELD(VT_HPIXEN, VT_HPIXEN_ON, outputVal, htmp);
654         SET_DBE_FIELD(VT_HPIXEN, VT_HPIXEN_OFF, outputVal,
655                       ((htmp + currentTiming->width -
656                         2) % currentTiming->htotal));
657         DBE_SETREG(vt_hpixen, outputVal);
658
659         outputVal = 0;
660         SET_DBE_FIELD(VT_VPIXEN, VT_VPIXEN_OFF, outputVal,
661                       currentTiming->vblank_start);
662         SET_DBE_FIELD(VT_VPIXEN, VT_VPIXEN_ON, outputVal,
663                       currentTiming->vblank_end);
664         DBE_SETREG(vt_vpixen, outputVal);
665
666         // Turn off mouse cursor
667         par->regs->crs_ctl = 0;
668
669         // XXX What's this section for??
670         DBE_GETREG(ctrlstat, readVal);
671         readVal &= 0x02000000;
672
673         if (readVal != 0) {
674                 DBE_SETREG(ctrlstat, 0x30000000);
675         }
676         return 0;
677 }
678
679 /*
680  *  Set a single color register. The values supplied are already
681  *  rounded down to the hardware's capabilities (according to the
682  *  entries in the var structure). Return != 0 for invalid regno.
683  */
684
685 static int sgivwfb_setcolreg(u_int regno, u_int red, u_int green,
686                              u_int blue, u_int transp,
687                              struct fb_info *info)
688 {
689         struct sgivw_par *par = (struct sgivw_par *) info->par;
690
691         if (regno > 255)
692                 return 1;
693         red >>= 8;
694         green >>= 8;
695         blue >>= 8;
696
697         /* wait for the color map FIFO to have a free entry */
698         while (par->cmap_fifo == 0)
699                 par->cmap_fifo = par->regs->cm_fifo;
700
701         par->regs->cmap[regno] = (red << 24) | (green << 16) | (blue << 8);
702         par->cmap_fifo--;       /* assume FIFO is filling up */
703         return 0;
704 }
705
706 static int sgivwfb_mmap(struct fb_info *info,
707                         struct vm_area_struct *vma)
708 {
709         unsigned long size = vma->vm_end - vma->vm_start;
710         unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
711
712         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
713                 return -EINVAL;
714         if (offset + size > sgivwfb_mem_size)
715                 return -EINVAL;
716         offset += sgivwfb_mem_phys;
717         pgprot_val(vma->vm_page_prot) =
718             pgprot_val(vma->vm_page_prot) | _PAGE_PCD;
719         vma->vm_flags |= VM_IO;
720         if (remap_pfn_range(vma, vma->vm_start, offset >> PAGE_SHIFT,
721                                                 size, vma->vm_page_prot))
722                 return -EAGAIN;
723         printk(KERN_DEBUG "sgivwfb: mmap framebuffer P(%lx)->V(%lx)\n",
724                offset, vma->vm_start);
725         return 0;
726 }
727
728 int __init sgivwfb_setup(char *options)
729 {
730         char *this_opt;
731
732         if (!options || !*options)
733                 return 0;
734
735         while ((this_opt = strsep(&options, ",")) != NULL) {
736                 if (!strncmp(this_opt, "monitor:", 8)) {
737                         if (!strncmp(this_opt + 8, "crt", 3))
738                                 flatpanel_id = -1;
739                         else if (!strncmp(this_opt + 8, "1600sw", 6))
740                                 flatpanel_id = FLATPANEL_SGI_1600SW;
741                 }
742         }
743         return 0;
744 }
745
746 /*
747  *  Initialisation
748  */
749 static int __init sgivwfb_probe(struct platform_device *dev)
750 {
751         struct sgivw_par *par;
752         struct fb_info *info;
753         char *monitor;
754
755         info = framebuffer_alloc(sizeof(struct sgivw_par) + sizeof(u32) * 256, &dev->dev);
756         if (!info)
757                 return -ENOMEM;
758         par = info->par;
759
760         if (!request_mem_region(DBE_REG_PHYS, DBE_REG_SIZE, "sgivwfb")) {
761                 printk(KERN_ERR "sgivwfb: couldn't reserve mmio region\n");
762                 framebuffer_release(info);
763                 return -EBUSY;
764         }
765
766         par->regs = (struct asregs *) ioremap_nocache(DBE_REG_PHYS, DBE_REG_SIZE);
767         if (!par->regs) {
768                 printk(KERN_ERR "sgivwfb: couldn't ioremap registers\n");
769                 goto fail_ioremap_regs;
770         }
771
772         mtrr_add(sgivwfb_mem_phys, sgivwfb_mem_size, MTRR_TYPE_WRCOMB, 1);
773
774         sgivwfb_fix.smem_start = sgivwfb_mem_phys;
775         sgivwfb_fix.smem_len = sgivwfb_mem_size;
776         sgivwfb_fix.ywrapstep = ywrap;
777         sgivwfb_fix.ypanstep = ypan;
778
779         info->fix = sgivwfb_fix;
780
781         switch (flatpanel_id) {
782                 case FLATPANEL_SGI_1600SW:
783                         info->var = sgivwfb_var1600sw;
784                         monitor = "SGI 1600SW flatpanel";
785                         break;
786                 default:
787                         info->var = sgivwfb_var;
788                         monitor = "CRT";
789         }
790
791         printk(KERN_INFO "sgivwfb: %s monitor selected\n", monitor);
792
793         info->fbops = &sgivwfb_ops;
794         info->pseudo_palette = (void *) (par + 1);
795         info->flags = FBINFO_DEFAULT;
796
797         info->screen_base = ioremap_nocache((unsigned long) sgivwfb_mem_phys, sgivwfb_mem_size);
798         if (!info->screen_base) {
799                 printk(KERN_ERR "sgivwfb: couldn't ioremap screen_base\n");
800                 goto fail_ioremap_fbmem;
801         }
802
803         if (fb_alloc_cmap(&info->cmap, 256, 0) < 0)
804                 goto fail_color_map;
805
806         if (register_framebuffer(info) < 0) {
807                 printk(KERN_ERR "sgivwfb: couldn't register framebuffer\n");
808                 goto fail_register_framebuffer;
809         }
810
811         platform_set_drvdata(dev, info);
812
813         printk(KERN_INFO "fb%d: SGI DBE frame buffer device, using %ldK of video memory at %#lx\n",      
814                 info->node, sgivwfb_mem_size >> 10, sgivwfb_mem_phys);
815         return 0;
816
817 fail_register_framebuffer:
818         fb_dealloc_cmap(&info->cmap);
819 fail_color_map:
820         iounmap((char *) info->screen_base);
821 fail_ioremap_fbmem:
822         iounmap(par->regs);
823 fail_ioremap_regs:
824         release_mem_region(DBE_REG_PHYS, DBE_REG_SIZE);
825         framebuffer_release(info);
826         return -ENXIO;
827 }
828
829 static int sgivwfb_remove(struct platform_device *dev)
830 {
831         struct fb_info *info = platform_get_drvdata(dev);
832
833         if (info) {
834                 struct sgivw_par *par = info->par;
835
836                 unregister_framebuffer(info);
837                 dbe_TurnOffDma(par);
838                 iounmap(par->regs);
839                 iounmap(info->screen_base);
840                 release_mem_region(DBE_REG_PHYS, DBE_REG_SIZE);
841         }
842         return 0;
843 }
844
845 static struct platform_driver sgivwfb_driver = {
846         .probe  = sgivwfb_probe,
847         .remove = sgivwfb_remove,
848         .driver = {
849                 .name   = "sgivwfb",
850         },
851 };
852
853 static struct platform_device *sgivwfb_device;
854
855 int __init sgivwfb_init(void)
856 {
857         int ret;
858
859 #ifndef MODULE
860         char *option = NULL;
861
862         if (fb_get_options("sgivwfb", &option))
863                 return -ENODEV;
864         sgivwfb_setup(option);
865 #endif
866         ret = platform_driver_register(&sgivwfb_driver);
867         if (!ret) {
868                 sgivwfb_device = platform_device_alloc("sgivwfb", 0);
869                 if (sgivwfb_device) {
870                         ret = platform_device_add(sgivwfb_device);
871                 } else
872                         ret = -ENOMEM;
873                 if (ret) {
874                         platform_driver_unregister(&sgivwfb_driver);
875                         platform_device_put(sgivwfb_device);
876                 }
877         }
878         return ret;
879 }
880
881 module_init(sgivwfb_init);
882
883 #ifdef MODULE
884 MODULE_LICENSE("GPL");
885
886 static void __exit sgivwfb_exit(void)
887 {
888         platform_device_unregister(sgivwfb_device);
889         platform_driver_unregister(&sgivwfb_driver);
890 }
891
892 module_exit(sgivwfb_exit);
893
894 #endif                          /* MODULE */