Merge branch 'master'
[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/config.h>
13 #include <linux/module.h>
14 #include <linux/kernel.h>
15 #include <linux/mm.h>
16 #include <linux/errno.h>
17 #include <linux/delay.h>
18 #include <linux/fb.h>
19 #include <linux/init.h>
20 #include <linux/ioport.h>
21 #include <linux/platform_device.h>
22
23 #include <asm/io.h>
24 #include <asm/mtrr.h>
25
26 #define INCLUDE_TIMING_TABLE_DATA
27 #define DBE_REG_BASE par->regs
28 #include <video/sgivw.h>
29
30 struct sgivw_par {
31         struct asregs *regs;
32         u32 cmap_fifo;
33         u_long timing_num;
34 };
35
36 #define FLATPANEL_SGI_1600SW    5
37
38 /*
39  *  RAM we reserve for the frame buffer. This defines the maximum screen
40  *  size
41  *
42  *  The default can be overridden if the driver is compiled as a module
43  */
44
45 /* set by arch/i386/kernel/setup.c */
46 extern unsigned long sgivwfb_mem_phys;
47 extern unsigned long sgivwfb_mem_size;
48
49 static int ypan = 0;
50 static int ywrap = 0;
51
52 static int flatpanel_id = -1;
53
54 static struct fb_fix_screeninfo sgivwfb_fix __initdata = {
55         .id             = "SGI Vis WS FB",
56         .type           = FB_TYPE_PACKED_PIXELS,
57         .visual         = FB_VISUAL_PSEUDOCOLOR,
58         .mmio_start     = DBE_REG_PHYS,
59         .mmio_len       = DBE_REG_SIZE,
60         .accel          = FB_ACCEL_NONE,
61         .line_length    = 640,
62 };
63
64 static struct fb_var_screeninfo sgivwfb_var __initdata = {
65         /* 640x480, 8 bpp */
66         .xres           = 640,
67         .yres           = 480,
68         .xres_virtual   = 640,
69         .yres_virtual   = 480,
70         .bits_per_pixel = 8,
71         .red            = { 0, 8, 0 },
72         .green          = { 0, 8, 0 },
73         .blue           = { 0, 8, 0 },
74         .height         = -1,
75         .width          = -1,
76         .pixclock       = 20000,
77         .left_margin    = 64,
78         .right_margin   = 64,
79         .upper_margin   = 32,
80         .lower_margin   = 32,
81         .hsync_len      = 64,
82         .vsync_len      = 2,
83         .vmode          = FB_VMODE_NONINTERLACED
84 };
85
86 static struct fb_var_screeninfo sgivwfb_var1600sw __initdata = {
87         /* 1600x1024, 8 bpp */
88         .xres           = 1600,
89         .yres           = 1024,
90         .xres_virtual   = 1600,
91         .yres_virtual   = 1024,
92         .bits_per_pixel = 8,
93         .red            = { 0, 8, 0 },
94         .green          = { 0, 8, 0 },
95         .blue           = { 0, 8, 0 },
96         .height         = -1,
97         .width          = -1,
98         .pixclock       = 9353,
99         .left_margin    = 20,
100         .right_margin   = 30,
101         .upper_margin   = 37,
102         .lower_margin   = 3,
103         .hsync_len      = 20,
104         .vsync_len      = 3,
105         .vmode          = FB_VMODE_NONINTERLACED
106 };
107
108 /*
109  *  Interface used by the world
110  */
111 int sgivwfb_init(void);
112
113 static int sgivwfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info);
114 static int sgivwfb_set_par(struct fb_info *info);
115 static int sgivwfb_setcolreg(u_int regno, u_int red, u_int green,
116                              u_int blue, u_int transp,
117                              struct fb_info *info);
118 static int sgivwfb_mmap(struct fb_info *info, struct file *file,
119                         struct vm_area_struct *vma);
120
121 static struct fb_ops sgivwfb_ops = {
122         .owner          = THIS_MODULE,
123         .fb_check_var   = sgivwfb_check_var,
124         .fb_set_par     = sgivwfb_set_par,
125         .fb_setcolreg   = sgivwfb_setcolreg,
126         .fb_fillrect    = cfb_fillrect,
127         .fb_copyarea    = cfb_copyarea,
128         .fb_imageblit   = cfb_imageblit,
129         .fb_mmap        = sgivwfb_mmap,
130 };
131
132 /*
133  *  Internal routines
134  */
135 static unsigned long bytes_per_pixel(int bpp)
136 {
137         switch (bpp) {
138                 case 8:
139                         return 1;
140                 case 16:
141                         return 2;
142                 case 32:
143                         return 4;
144                 default:
145                         printk(KERN_INFO "sgivwfb: unsupported bpp %d\n", bpp);
146                         return 0;
147         }
148 }
149
150 static unsigned long get_line_length(int xres_virtual, int bpp)
151 {
152         return (xres_virtual * bytes_per_pixel(bpp));
153 }
154
155 /*
156  * Function:    dbe_TurnOffDma
157  * Parameters:  (None)
158  * Description: This should turn off the monitor and dbe.  This is used
159  *              when switching between the serial console and the graphics
160  *              console.
161  */
162
163 static void dbe_TurnOffDma(struct sgivw_par *par)
164 {
165         unsigned int readVal;
166         int i;
167
168         // Check to see if things are already turned off:
169         // 1) Check to see if dbe is not using the internal dotclock.
170         // 2) Check to see if the xy counter in dbe is already off.
171
172         DBE_GETREG(ctrlstat, readVal);
173         if (GET_DBE_FIELD(CTRLSTAT, PCLKSEL, readVal) < 2)
174                 return;
175
176         DBE_GETREG(vt_xy, readVal);
177         if (GET_DBE_FIELD(VT_XY, VT_FREEZE, readVal) == 1)
178                 return;
179
180         // Otherwise, turn off dbe
181
182         DBE_GETREG(ovr_control, readVal);
183         SET_DBE_FIELD(OVR_CONTROL, OVR_DMA_ENABLE, readVal, 0);
184         DBE_SETREG(ovr_control, readVal);
185         udelay(1000);
186         DBE_GETREG(frm_control, readVal);
187         SET_DBE_FIELD(FRM_CONTROL, FRM_DMA_ENABLE, readVal, 0);
188         DBE_SETREG(frm_control, readVal);
189         udelay(1000);
190         DBE_GETREG(did_control, readVal);
191         SET_DBE_FIELD(DID_CONTROL, DID_DMA_ENABLE, readVal, 0);
192         DBE_SETREG(did_control, readVal);
193         udelay(1000);
194
195         // XXX HACK:
196         //
197         //    This was necessary for GBE--we had to wait through two
198         //    vertical retrace periods before the pixel DMA was
199         //    turned off for sure.  I've left this in for now, in
200         //    case dbe needs it.
201
202         for (i = 0; i < 10000; i++) {
203                 DBE_GETREG(frm_inhwctrl, readVal);
204                 if (GET_DBE_FIELD(FRM_INHWCTRL, FRM_DMA_ENABLE, readVal) ==
205                     0)
206                         udelay(10);
207                 else {
208                         DBE_GETREG(ovr_inhwctrl, readVal);
209                         if (GET_DBE_FIELD
210                             (OVR_INHWCTRL, OVR_DMA_ENABLE, readVal) == 0)
211                                 udelay(10);
212                         else {
213                                 DBE_GETREG(did_inhwctrl, readVal);
214                                 if (GET_DBE_FIELD
215                                     (DID_INHWCTRL, DID_DMA_ENABLE,
216                                      readVal) == 0)
217                                         udelay(10);
218                                 else
219                                         break;
220                         }
221                 }
222         }
223 }
224
225 /*
226  *  Set the User Defined Part of the Display. Again if par use it to get
227  *  real video mode.
228  */
229 static int sgivwfb_check_var(struct fb_var_screeninfo *var, 
230                              struct fb_info *info)
231 {
232         struct sgivw_par *par = (struct sgivw_par *)info->par;
233         struct dbe_timing_info *timing;
234         u_long line_length;
235         u_long min_mode;
236         int req_dot;
237         int test_mode;
238
239         /*
240          *  FB_VMODE_CONUPDATE and FB_VMODE_SMOOTH_XPAN are equal!
241          *  as FB_VMODE_SMOOTH_XPAN is only used internally
242          */
243
244         if (var->vmode & FB_VMODE_CONUPDATE) {
245                 var->vmode |= FB_VMODE_YWRAP;
246                 var->xoffset = info->var.xoffset;
247                 var->yoffset = info->var.yoffset;
248         }
249
250         /* XXX FIXME - forcing var's */
251         var->xoffset = 0;
252         var->yoffset = 0;
253
254         /* Limit bpp to 8, 16, and 32 */
255         if (var->bits_per_pixel <= 8)
256                 var->bits_per_pixel = 8;
257         else if (var->bits_per_pixel <= 16)
258                 var->bits_per_pixel = 16;
259         else if (var->bits_per_pixel <= 32)
260                 var->bits_per_pixel = 32;
261         else
262                 return -EINVAL;
263
264         var->grayscale = 0;     /* No grayscale for now */
265
266         /* determine valid resolution and timing */
267         for (min_mode = 0; min_mode < DBE_VT_SIZE; min_mode++) {
268                 if (dbeVTimings[min_mode].width >= var->xres &&
269                     dbeVTimings[min_mode].height >= var->yres)
270                         break;
271         }
272
273         if (min_mode == DBE_VT_SIZE)
274                 return -EINVAL; /* Resolution to high */
275
276         /* XXX FIXME - should try to pick best refresh rate */
277         /* for now, pick closest dot-clock within 3MHz */
278         req_dot = PICOS2KHZ(var->pixclock);
279         printk(KERN_INFO "sgivwfb: requested pixclock=%d ps (%d KHz)\n",
280                var->pixclock, req_dot);
281         test_mode = min_mode;
282         while (dbeVTimings[min_mode].width == dbeVTimings[test_mode].width) {
283                 if (dbeVTimings[test_mode].cfreq + 3000 > req_dot)
284                         break;
285                 test_mode++;
286         }
287         if (dbeVTimings[min_mode].width != dbeVTimings[test_mode].width)
288                 test_mode--;
289         min_mode = test_mode;
290         timing = &dbeVTimings[min_mode];
291         printk(KERN_INFO "sgivwfb: granted dot-clock=%d KHz\n", timing->cfreq);
292
293         /* Adjust virtual resolution, if necessary */
294         if (var->xres > var->xres_virtual || (!ywrap && !ypan))
295                 var->xres_virtual = var->xres;
296         if (var->yres > var->yres_virtual || (!ywrap && !ypan))
297                 var->yres_virtual = var->yres;
298
299         /*
300          *  Memory limit
301          */
302         line_length = get_line_length(var->xres_virtual, var->bits_per_pixel);
303         if (line_length * var->yres_virtual > sgivwfb_mem_size)
304                 return -ENOMEM; /* Virtual resolution to high */
305
306         info->fix.line_length = line_length;
307
308         switch (var->bits_per_pixel) {
309         case 8:
310                 var->red.offset = 0;
311                 var->red.length = 8;
312                 var->green.offset = 0;
313                 var->green.length = 8;
314                 var->blue.offset = 0;
315                 var->blue.length = 8;
316                 var->transp.offset = 0;
317                 var->transp.length = 0;
318                 break;
319         case 16:                /* RGBA 5551 */
320                 var->red.offset = 11;
321                 var->red.length = 5;
322                 var->green.offset = 6;
323                 var->green.length = 5;
324                 var->blue.offset = 1;
325                 var->blue.length = 5;
326                 var->transp.offset = 0;
327                 var->transp.length = 0;
328                 break;
329         case 32:                /* RGB 8888 */
330                 var->red.offset = 0;
331                 var->red.length = 8;
332                 var->green.offset = 8;
333                 var->green.length = 8;
334                 var->blue.offset = 16;
335                 var->blue.length = 8;
336                 var->transp.offset = 24;
337                 var->transp.length = 8;
338                 break;
339         }
340         var->red.msb_right = 0;
341         var->green.msb_right = 0;
342         var->blue.msb_right = 0;
343         var->transp.msb_right = 0;
344
345         /* set video timing information */
346         var->pixclock = KHZ2PICOS(timing->cfreq);
347         var->left_margin = timing->htotal - timing->hsync_end;
348         var->right_margin = timing->hsync_start - timing->width;
349         var->upper_margin = timing->vtotal - timing->vsync_end;
350         var->lower_margin = timing->vsync_start - timing->height;
351         var->hsync_len = timing->hsync_end - timing->hsync_start;
352         var->vsync_len = timing->vsync_end - timing->vsync_start;
353
354         /* Ouch. This breaks the rules but timing_num is only important if you
355         * change a video mode */
356         par->timing_num = min_mode;
357
358         printk(KERN_INFO "sgivwfb: new video mode xres=%d yres=%d bpp=%d\n",
359                 var->xres, var->yres, var->bits_per_pixel);
360         printk(KERN_INFO "         vxres=%d vyres=%d\n", var->xres_virtual,
361                 var->yres_virtual);
362         return 0;
363 }
364
365 /*
366  *  Setup flatpanel related registers.
367  */
368 static void sgivwfb_setup_flatpanel(struct sgivw_par *par, struct dbe_timing_info *currentTiming)
369 {
370         int fp_wid, fp_hgt, fp_vbs, fp_vbe;
371         u32 outputVal = 0;
372
373         SET_DBE_FIELD(VT_FLAGS, HDRV_INVERT, outputVal, 
374                 (currentTiming->flags & FB_SYNC_HOR_HIGH_ACT) ? 0 : 1);
375         SET_DBE_FIELD(VT_FLAGS, VDRV_INVERT, outputVal, 
376                 (currentTiming->flags & FB_SYNC_VERT_HIGH_ACT) ? 0 : 1);
377         DBE_SETREG(vt_flags, outputVal);
378
379         /* Turn on the flat panel */
380         switch (flatpanel_id) {
381                 case FLATPANEL_SGI_1600SW:
382                         fp_wid = 1600;
383                         fp_hgt = 1024;
384                         fp_vbs = 0;
385                         fp_vbe = 1600;
386                         currentTiming->pll_m = 4;
387                         currentTiming->pll_n = 1;
388                         currentTiming->pll_p = 0;
389                         break;
390                 default:
391                         fp_wid = fp_hgt = fp_vbs = fp_vbe = 0xfff;
392         }
393
394         outputVal = 0;
395         SET_DBE_FIELD(FP_DE, FP_DE_ON, outputVal, fp_vbs);
396         SET_DBE_FIELD(FP_DE, FP_DE_OFF, outputVal, fp_vbe);
397         DBE_SETREG(fp_de, outputVal);
398         outputVal = 0;
399         SET_DBE_FIELD(FP_HDRV, FP_HDRV_OFF, outputVal, fp_wid);
400         DBE_SETREG(fp_hdrv, outputVal);
401         outputVal = 0;
402         SET_DBE_FIELD(FP_VDRV, FP_VDRV_ON, outputVal, 1);
403         SET_DBE_FIELD(FP_VDRV, FP_VDRV_OFF, outputVal, fp_hgt + 1);
404         DBE_SETREG(fp_vdrv, outputVal);
405 }
406
407 /*
408  *  Set the hardware according to 'par'.
409  */
410 static int sgivwfb_set_par(struct fb_info *info)
411 {
412         struct sgivw_par *par = info->par;
413         int i, j, htmp, temp;
414         u32 readVal, outputVal;
415         int wholeTilesX, maxPixelsPerTileX;
416         int frmWrite1, frmWrite2, frmWrite3b;
417         struct dbe_timing_info *currentTiming; /* Current Video Timing */
418         int xpmax, ypmax;       // Monitor resolution
419         int bytesPerPixel;      // Bytes per pixel
420
421         currentTiming = &dbeVTimings[par->timing_num];
422         bytesPerPixel = bytes_per_pixel(info->var.bits_per_pixel);
423         xpmax = currentTiming->width;
424         ypmax = currentTiming->height;
425
426         /* dbe_InitGraphicsBase(); */
427         /* Turn on dotclock PLL */
428         DBE_SETREG(ctrlstat, 0x20000000);
429
430         dbe_TurnOffDma(par);
431
432         /* dbe_CalculateScreenParams(); */
433         maxPixelsPerTileX = 512 / bytesPerPixel;
434         wholeTilesX = xpmax / maxPixelsPerTileX;
435         if (wholeTilesX * maxPixelsPerTileX < xpmax)
436                 wholeTilesX++;
437
438         printk(KERN_DEBUG "sgivwfb: pixPerTile=%d wholeTilesX=%d\n",
439                maxPixelsPerTileX, wholeTilesX);
440
441         /* dbe_InitGammaMap(); */
442         udelay(10);
443
444         for (i = 0; i < 256; i++) {
445                 DBE_ISETREG(gmap, i, (i << 24) | (i << 16) | (i << 8));
446         }
447
448         /* dbe_TurnOn(); */
449         DBE_GETREG(vt_xy, readVal);
450         if (GET_DBE_FIELD(VT_XY, VT_FREEZE, readVal) == 1) {
451                 DBE_SETREG(vt_xy, 0x00000000);
452                 udelay(1);
453         } else
454                 dbe_TurnOffDma(par);
455
456         /* dbe_Initdbe(); */
457         for (i = 0; i < 256; i++) {
458                 for (j = 0; j < 100; j++) {
459                         DBE_GETREG(cm_fifo, readVal);
460                         if (readVal != 0x00000000)
461                                 break;
462                         else
463                                 udelay(10);
464                 }
465
466                 // DBE_ISETREG(cmap, i, 0x00000000);
467                 DBE_ISETREG(cmap, i, (i << 8) | (i << 16) | (i << 24));
468         }
469
470         /* dbe_InitFramebuffer(); */
471         frmWrite1 = 0;
472         SET_DBE_FIELD(FRM_SIZE_TILE, FRM_WIDTH_TILE, frmWrite1,
473                       wholeTilesX);
474         SET_DBE_FIELD(FRM_SIZE_TILE, FRM_RHS, frmWrite1, 0);
475
476         switch (bytesPerPixel) {
477         case 1:
478                 SET_DBE_FIELD(FRM_SIZE_TILE, FRM_DEPTH, frmWrite1,
479                               DBE_FRM_DEPTH_8);
480                 break;
481         case 2:
482                 SET_DBE_FIELD(FRM_SIZE_TILE, FRM_DEPTH, frmWrite1,
483                               DBE_FRM_DEPTH_16);
484                 break;
485         case 4:
486                 SET_DBE_FIELD(FRM_SIZE_TILE, FRM_DEPTH, frmWrite1,
487                               DBE_FRM_DEPTH_32);
488                 break;
489         }
490
491         frmWrite2 = 0;
492         SET_DBE_FIELD(FRM_SIZE_PIXEL, FB_HEIGHT_PIX, frmWrite2, ypmax);
493
494         // Tell dbe about the framebuffer location and type
495         // XXX What format is the FRM_TILE_PTR??  64K aligned address?
496         frmWrite3b = 0;
497         SET_DBE_FIELD(FRM_CONTROL, FRM_TILE_PTR, frmWrite3b,
498                       sgivwfb_mem_phys >> 9);
499         SET_DBE_FIELD(FRM_CONTROL, FRM_DMA_ENABLE, frmWrite3b, 1);
500         SET_DBE_FIELD(FRM_CONTROL, FRM_LINEAR, frmWrite3b, 1);
501
502         /* Initialize DIDs */
503
504         outputVal = 0;
505         switch (bytesPerPixel) {
506         case 1:
507                 SET_DBE_FIELD(WID, TYP, outputVal, DBE_CMODE_I8);
508                 break;
509         case 2:
510                 SET_DBE_FIELD(WID, TYP, outputVal, DBE_CMODE_RGBA5);
511                 break;
512         case 4:
513                 SET_DBE_FIELD(WID, TYP, outputVal, DBE_CMODE_RGB8);
514                 break;
515         }
516         SET_DBE_FIELD(WID, BUF, outputVal, DBE_BMODE_BOTH);
517
518         for (i = 0; i < 32; i++) {
519                 DBE_ISETREG(mode_regs, i, outputVal);
520         }
521
522         /* dbe_InitTiming(); */
523         DBE_SETREG(vt_intr01, 0xffffffff);
524         DBE_SETREG(vt_intr23, 0xffffffff);
525
526         DBE_GETREG(dotclock, readVal);
527         DBE_SETREG(dotclock, readVal & 0xffff);
528
529         DBE_SETREG(vt_xymax, 0x00000000);
530         outputVal = 0;
531         SET_DBE_FIELD(VT_VSYNC, VT_VSYNC_ON, outputVal,
532                       currentTiming->vsync_start);
533         SET_DBE_FIELD(VT_VSYNC, VT_VSYNC_OFF, outputVal,
534                       currentTiming->vsync_end);
535         DBE_SETREG(vt_vsync, outputVal);
536         outputVal = 0;
537         SET_DBE_FIELD(VT_HSYNC, VT_HSYNC_ON, outputVal,
538                       currentTiming->hsync_start);
539         SET_DBE_FIELD(VT_HSYNC, VT_HSYNC_OFF, outputVal,
540                       currentTiming->hsync_end);
541         DBE_SETREG(vt_hsync, outputVal);
542         outputVal = 0;
543         SET_DBE_FIELD(VT_VBLANK, VT_VBLANK_ON, outputVal,
544                       currentTiming->vblank_start);
545         SET_DBE_FIELD(VT_VBLANK, VT_VBLANK_OFF, outputVal,
546                       currentTiming->vblank_end);
547         DBE_SETREG(vt_vblank, outputVal);
548         outputVal = 0;
549         SET_DBE_FIELD(VT_HBLANK, VT_HBLANK_ON, outputVal,
550                       currentTiming->hblank_start);
551         SET_DBE_FIELD(VT_HBLANK, VT_HBLANK_OFF, outputVal,
552                       currentTiming->hblank_end - 3);
553         DBE_SETREG(vt_hblank, outputVal);
554         outputVal = 0;
555         SET_DBE_FIELD(VT_VCMAP, VT_VCMAP_ON, outputVal,
556                       currentTiming->vblank_start);
557         SET_DBE_FIELD(VT_VCMAP, VT_VCMAP_OFF, outputVal,
558                       currentTiming->vblank_end);
559         DBE_SETREG(vt_vcmap, outputVal);
560         outputVal = 0;
561         SET_DBE_FIELD(VT_HCMAP, VT_HCMAP_ON, outputVal,
562                       currentTiming->hblank_start);
563         SET_DBE_FIELD(VT_HCMAP, VT_HCMAP_OFF, outputVal,
564                       currentTiming->hblank_end - 3);
565         DBE_SETREG(vt_hcmap, outputVal);
566
567         if (flatpanel_id != -1)
568                 sgivwfb_setup_flatpanel(par, currentTiming);
569
570         outputVal = 0;
571         temp = currentTiming->vblank_start - currentTiming->vblank_end - 1;
572         if (temp > 0)
573                 temp = -temp;
574
575         SET_DBE_FIELD(DID_START_XY, DID_STARTY, outputVal, (u32) temp);
576         if (currentTiming->hblank_end >= 20)
577                 SET_DBE_FIELD(DID_START_XY, DID_STARTX, outputVal,
578                               currentTiming->hblank_end - 20);
579         else
580                 SET_DBE_FIELD(DID_START_XY, DID_STARTX, outputVal,
581                               currentTiming->htotal - (20 -
582                                                        currentTiming->
583                                                        hblank_end));
584         DBE_SETREG(did_start_xy, outputVal);
585
586         outputVal = 0;
587         SET_DBE_FIELD(CRS_START_XY, CRS_STARTY, outputVal,
588                       (u32) (temp + 1));
589         if (currentTiming->hblank_end >= DBE_CRS_MAGIC)
590                 SET_DBE_FIELD(CRS_START_XY, CRS_STARTX, outputVal,
591                               currentTiming->hblank_end - DBE_CRS_MAGIC);
592         else
593                 SET_DBE_FIELD(CRS_START_XY, CRS_STARTX, outputVal,
594                               currentTiming->htotal - (DBE_CRS_MAGIC -
595                                                        currentTiming->
596                                                        hblank_end));
597         DBE_SETREG(crs_start_xy, outputVal);
598
599         outputVal = 0;
600         SET_DBE_FIELD(VC_START_XY, VC_STARTY, outputVal, (u32) temp);
601         SET_DBE_FIELD(VC_START_XY, VC_STARTX, outputVal,
602                       currentTiming->hblank_end - 4);
603         DBE_SETREG(vc_start_xy, outputVal);
604
605         DBE_SETREG(frm_size_tile, frmWrite1);
606         DBE_SETREG(frm_size_pixel, frmWrite2);
607
608         outputVal = 0;
609         SET_DBE_FIELD(DOTCLK, M, outputVal, currentTiming->pll_m - 1);
610         SET_DBE_FIELD(DOTCLK, N, outputVal, currentTiming->pll_n - 1);
611         SET_DBE_FIELD(DOTCLK, P, outputVal, currentTiming->pll_p);
612         SET_DBE_FIELD(DOTCLK, RUN, outputVal, 1);
613         DBE_SETREG(dotclock, outputVal);
614
615         udelay(11 * 1000);
616
617         DBE_SETREG(vt_vpixen, 0xffffff);
618         DBE_SETREG(vt_hpixen, 0xffffff);
619
620         outputVal = 0;
621         SET_DBE_FIELD(VT_XYMAX, VT_MAXX, outputVal, currentTiming->htotal);
622         SET_DBE_FIELD(VT_XYMAX, VT_MAXY, outputVal, currentTiming->vtotal);
623         DBE_SETREG(vt_xymax, outputVal);
624
625         outputVal = frmWrite1;
626         SET_DBE_FIELD(FRM_SIZE_TILE, FRM_FIFO_RESET, outputVal, 1);
627         DBE_SETREG(frm_size_tile, outputVal);
628         DBE_SETREG(frm_size_tile, frmWrite1);
629
630         outputVal = 0;
631         SET_DBE_FIELD(OVR_WIDTH_TILE, OVR_FIFO_RESET, outputVal, 1);
632         DBE_SETREG(ovr_width_tile, outputVal);
633         DBE_SETREG(ovr_width_tile, 0);
634
635         DBE_SETREG(frm_control, frmWrite3b);
636         DBE_SETREG(did_control, 0);
637
638         // Wait for dbe to take frame settings
639         for (i = 0; i < 100000; i++) {
640                 DBE_GETREG(frm_inhwctrl, readVal);
641                 if (GET_DBE_FIELD(FRM_INHWCTRL, FRM_DMA_ENABLE, readVal) !=
642                     0)
643                         break;
644                 else
645                         udelay(1);
646         }
647
648         if (i == 100000)
649                 printk(KERN_INFO
650                        "sgivwfb: timeout waiting for frame DMA enable.\n");
651
652         outputVal = 0;
653         htmp = currentTiming->hblank_end - 19;
654         if (htmp < 0)
655                 htmp += currentTiming->htotal;  /* allow blank to wrap around */
656         SET_DBE_FIELD(VT_HPIXEN, VT_HPIXEN_ON, outputVal, htmp);
657         SET_DBE_FIELD(VT_HPIXEN, VT_HPIXEN_OFF, outputVal,
658                       ((htmp + currentTiming->width -
659                         2) % currentTiming->htotal));
660         DBE_SETREG(vt_hpixen, outputVal);
661
662         outputVal = 0;
663         SET_DBE_FIELD(VT_VPIXEN, VT_VPIXEN_OFF, outputVal,
664                       currentTiming->vblank_start);
665         SET_DBE_FIELD(VT_VPIXEN, VT_VPIXEN_ON, outputVal,
666                       currentTiming->vblank_end);
667         DBE_SETREG(vt_vpixen, outputVal);
668
669         // Turn off mouse cursor
670         par->regs->crs_ctl = 0;
671
672         // XXX What's this section for??
673         DBE_GETREG(ctrlstat, readVal);
674         readVal &= 0x02000000;
675
676         if (readVal != 0) {
677                 DBE_SETREG(ctrlstat, 0x30000000);
678         }
679         return 0;
680 }
681
682 /*
683  *  Set a single color register. The values supplied are already
684  *  rounded down to the hardware's capabilities (according to the
685  *  entries in the var structure). Return != 0 for invalid regno.
686  */
687
688 static int sgivwfb_setcolreg(u_int regno, u_int red, u_int green,
689                              u_int blue, u_int transp,
690                              struct fb_info *info)
691 {
692         struct sgivw_par *par = (struct sgivw_par *) info->par;
693
694         if (regno > 255)
695                 return 1;
696         red >>= 8;
697         green >>= 8;
698         blue >>= 8;
699
700         /* wait for the color map FIFO to have a free entry */
701         while (par->cmap_fifo == 0)
702                 par->cmap_fifo = par->regs->cm_fifo;
703
704         par->regs->cmap[regno] = (red << 24) | (green << 16) | (blue << 8);
705         par->cmap_fifo--;       /* assume FIFO is filling up */
706         return 0;
707 }
708
709 static int sgivwfb_mmap(struct fb_info *info, struct file *file,
710                         struct vm_area_struct *vma)
711 {
712         unsigned long size = vma->vm_end - vma->vm_start;
713         unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
714
715         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
716                 return -EINVAL;
717         if (offset + size > sgivwfb_mem_size)
718                 return -EINVAL;
719         offset += sgivwfb_mem_phys;
720         pgprot_val(vma->vm_page_prot) =
721             pgprot_val(vma->vm_page_prot) | _PAGE_PCD;
722         vma->vm_flags |= VM_IO;
723         if (remap_pfn_range(vma, vma->vm_start, offset >> PAGE_SHIFT,
724                                                 size, vma->vm_page_prot))
725                 return -EAGAIN;
726         vma->vm_file = file;
727         printk(KERN_DEBUG "sgivwfb: mmap framebuffer P(%lx)->V(%lx)\n",
728                offset, vma->vm_start);
729         return 0;
730 }
731
732 int __init sgivwfb_setup(char *options)
733 {
734         char *this_opt;
735
736         if (!options || !*options)
737                 return 0;
738
739         while ((this_opt = strsep(&options, ",")) != NULL) {
740                 if (!strncmp(this_opt, "monitor:", 8)) {
741                         if (!strncmp(this_opt + 8, "crt", 3))
742                                 flatpanel_id = -1;
743                         else if (!strncmp(this_opt + 8, "1600sw", 6))
744                                 flatpanel_id = FLATPANEL_SGI_1600SW;
745                 }
746         }
747         return 0;
748 }
749
750 /*
751  *  Initialisation
752  */
753 static int __init sgivwfb_probe(struct device *device)
754 {
755         struct platform_device *dev = to_platform_device(device);
756         struct sgivw_par *par;
757         struct fb_info *info;
758         char *monitor;
759
760         info = framebuffer_alloc(sizeof(struct sgivw_par) + sizeof(u32) * 256, &dev->dev);
761         if (!info)
762                 return -ENOMEM;
763         par = info->par;
764
765         if (!request_mem_region(DBE_REG_PHYS, DBE_REG_SIZE, "sgivwfb")) {
766                 printk(KERN_ERR "sgivwfb: couldn't reserve mmio region\n");
767                 framebuffer_release(info);
768                 return -EBUSY;
769         }
770
771         par->regs = (struct asregs *) ioremap_nocache(DBE_REG_PHYS, DBE_REG_SIZE);
772         if (!par->regs) {
773                 printk(KERN_ERR "sgivwfb: couldn't ioremap registers\n");
774                 goto fail_ioremap_regs;
775         }
776
777         mtrr_add(sgivwfb_mem_phys, sgivwfb_mem_size, MTRR_TYPE_WRCOMB, 1);
778
779         sgivwfb_fix.smem_start = sgivwfb_mem_phys;
780         sgivwfb_fix.smem_len = sgivwfb_mem_size;
781         sgivwfb_fix.ywrapstep = ywrap;
782         sgivwfb_fix.ypanstep = ypan;
783
784         info->fix = sgivwfb_fix;
785
786         switch (flatpanel_id) {
787                 case FLATPANEL_SGI_1600SW:
788                         info->var = sgivwfb_var1600sw;
789                         monitor = "SGI 1600SW flatpanel";
790                         break;
791                 default:
792                         info->var = sgivwfb_var;
793                         monitor = "CRT";
794         }
795
796         printk(KERN_INFO "sgivwfb: %s monitor selected\n", monitor);
797
798         info->fbops = &sgivwfb_ops;
799         info->pseudo_palette = (void *) (par + 1);
800         info->flags = FBINFO_DEFAULT;
801
802         info->screen_base = ioremap_nocache((unsigned long) sgivwfb_mem_phys, sgivwfb_mem_size);
803         if (!info->screen_base) {
804                 printk(KERN_ERR "sgivwfb: couldn't ioremap screen_base\n");
805                 goto fail_ioremap_fbmem;
806         }
807
808         if (fb_alloc_cmap(&info->cmap, 256, 0) < 0)
809                 goto fail_color_map;
810
811         if (register_framebuffer(info) < 0) {
812                 printk(KERN_ERR "sgivwfb: couldn't register framebuffer\n");
813                 goto fail_register_framebuffer;
814         }
815
816         dev_set_drvdata(&dev->dev, info);
817
818         printk(KERN_INFO "fb%d: SGI DBE frame buffer device, using %ldK of video memory at %#lx\n",      
819                 info->node, sgivwfb_mem_size >> 10, sgivwfb_mem_phys);
820         return 0;
821
822 fail_register_framebuffer:
823         fb_dealloc_cmap(&info->cmap);
824 fail_color_map:
825         iounmap((char *) info->screen_base);
826 fail_ioremap_fbmem:
827         iounmap(par->regs);
828 fail_ioremap_regs:
829         release_mem_region(DBE_REG_PHYS, DBE_REG_SIZE);
830         framebuffer_release(info);
831         return -ENXIO;
832 }
833
834 static int sgivwfb_remove(struct device *device)
835 {
836         struct fb_info *info = dev_get_drvdata(device);
837
838         if (info) {
839                 struct sgivw_par *par = info->par;
840
841                 unregister_framebuffer(info);
842                 dbe_TurnOffDma(par);
843                 iounmap(par->regs);
844                 iounmap(info->screen_base);
845                 release_mem_region(DBE_REG_PHYS, DBE_REG_SIZE);
846         }
847         return 0;
848 }
849
850 static struct device_driver sgivwfb_driver = {
851         .name   = "sgivwfb",
852         .bus    = &platform_bus_type,
853         .probe  = sgivwfb_probe,
854         .remove = sgivwfb_remove,
855 };
856
857 static struct platform_device *sgivwfb_device;
858
859 int __init sgivwfb_init(void)
860 {
861         int ret;
862
863 #ifndef MODULE
864         char *option = NULL;
865
866         if (fb_get_options("sgivwfb", &option))
867                 return -ENODEV;
868         sgivwfb_setup(option);
869 #endif
870         ret = driver_register(&sgivwfb_driver);
871         if (!ret) {
872                 sgivwfb_device = platform_device_alloc("sgivwfb", 0);
873                 if (sgivwfb_device) {
874                         ret = platform_device_add(sgivwfb_device);
875                 } else
876                         ret = -ENOMEM;
877                 if (ret) {
878                         driver_unregister(&sgivwfb_driver);
879                         platform_device_put(sgivwfb_device);
880                 }
881         }
882         return ret;
883 }
884
885 module_init(sgivwfb_init);
886
887 #ifdef MODULE
888 MODULE_LICENSE("GPL");
889
890 static void __exit sgivwfb_exit(void)
891 {
892         platform_device_unregister(sgivwfb_device);
893         driver_unregister(&sgivwfb_driver);
894 }
895
896 module_exit(sgivwfb_exit);
897
898 #endif                          /* MODULE */