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perf buildid: Fix possible unterminated readlink() result buffer
[linux-2.6/linux-mips.git] / drivers / video / gbefb.c
blob7e7b7a9ba274ba2d33450b68b76a55ba21fab898
1 /*
2 * SGI GBE frame buffer driver
3 *
4 * Copyright (C) 1999 Silicon Graphics, Inc. - Jeffrey Newquist
5 * Copyright (C) 2002 Vivien Chappelier <vivien.chappelier@linux-mips.org>
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/delay.h>
13 #include <linux/platform_device.h>
14 #include <linux/dma-mapping.h>
15 #include <linux/errno.h>
16 #include <linux/gfp.h>
17 #include <linux/fb.h>
18 #include <linux/init.h>
19 #include <linux/interrupt.h>
20 #include <linux/kernel.h>
21 #include <linux/mm.h>
22 #include <linux/module.h>
23
24 #ifdef CONFIG_X86
25 #include <asm/mtrr.h>
26 #endif
27 #ifdef CONFIG_MIPS
28 #include <asm/addrspace.h>
29 #endif
30 #include <asm/byteorder.h>
31 #include <asm/io.h>
32 #include <asm/tlbflush.h>
33
34 #include <video/gbe.h>
35
36 static struct sgi_gbe *gbe;
37
38 struct gbefb_par {
39 struct fb_var_screeninfo var;
40 struct gbe_timing_info timing;
41 int valid;
42 };
43
44 #ifdef CONFIG_SGI_IP32
45 #define GBE_BASE 0x16000000 /* SGI O2 */
46 #endif
47
48 #ifdef CONFIG_X86_VISWS
49 #define GBE_BASE 0xd0000000 /* SGI Visual Workstation */
50 #endif
51
52 /* macro for fastest write-though access to the framebuffer */
53 #ifdef CONFIG_MIPS
54 #ifdef CONFIG_CPU_R10000
55 #define pgprot_fb(_prot) (((_prot) & (~_CACHE_MASK)) | _CACHE_UNCACHED_ACCELERATED)
56 #else
57 #define pgprot_fb(_prot) (((_prot) & (~_CACHE_MASK)) | _CACHE_CACHABLE_NO_WA)
58 #endif
59 #endif
60 #ifdef CONFIG_X86
61 #define pgprot_fb(_prot) ((_prot) | _PAGE_PCD)
62 #endif
63
64 /*
65 * RAM we reserve for the frame buffer. This defines the maximum screen
66 * size
67 */
68 #if CONFIG_FB_GBE_MEM > 8
69 #error GBE Framebuffer cannot use more than 8MB of memory
70 #endif
71
72 #define TILE_SHIFT 16
73 #define TILE_SIZE (1 << TILE_SHIFT)
74 #define TILE_MASK (TILE_SIZE - 1)
75
76 static unsigned int gbe_mem_size = CONFIG_FB_GBE_MEM * 1024*1024;
77 static void *gbe_mem;
78 static dma_addr_t gbe_dma_addr;
79 static unsigned long gbe_mem_phys;
80
81 static struct {
82 uint16_t *cpu;
83 dma_addr_t dma;
84 } gbe_tiles;
85
86 static int gbe_revision;
87
88 static int ypan, ywrap;
89
90 static uint32_t pseudo_palette[16];
91 static uint32_t gbe_cmap[256];
92 static int gbe_turned_on; /* 0 turned off, 1 turned on */
93
94 static char *mode_option __devinitdata = NULL;
95
96 /* default CRT mode */
97 static struct fb_var_screeninfo default_var_CRT __devinitdata = {
98 /* 640x480, 60 Hz, Non-Interlaced (25.175 MHz dotclock) */
99 .xres = 640,
100 .yres = 480,
101 .xres_virtual = 640,
102 .yres_virtual = 480,
103 .xoffset = 0,
104 .yoffset = 0,
105 .bits_per_pixel = 8,
106 .grayscale = 0,
107 .red = { 0, 8, 0 },
108 .green = { 0, 8, 0 },
109 .blue = { 0, 8, 0 },
110 .transp = { 0, 0, 0 },
111 .nonstd = 0,
112 .activate = 0,
113 .height = -1,
114 .width = -1,
115 .accel_flags = 0,
116 .pixclock = 39722, /* picoseconds */
117 .left_margin = 48,
118 .right_margin = 16,
119 .upper_margin = 33,
120 .lower_margin = 10,
121 .hsync_len = 96,
122 .vsync_len = 2,
123 .sync = 0,
124 .vmode = FB_VMODE_NONINTERLACED,
125 };
126
127 /* default LCD mode */
128 static struct fb_var_screeninfo default_var_LCD __devinitdata = {
129 /* 1600x1024, 8 bpp */
130 .xres = 1600,
131 .yres = 1024,
132 .xres_virtual = 1600,
133 .yres_virtual = 1024,
134 .xoffset = 0,
135 .yoffset = 0,
136 .bits_per_pixel = 8,
137 .grayscale = 0,
138 .red = { 0, 8, 0 },
139 .green = { 0, 8, 0 },
140 .blue = { 0, 8, 0 },
141 .transp = { 0, 0, 0 },
142 .nonstd = 0,
143 .activate = 0,
144 .height = -1,
145 .width = -1,
146 .accel_flags = 0,
147 .pixclock = 9353,
148 .left_margin = 20,
149 .right_margin = 30,
150 .upper_margin = 37,
151 .lower_margin = 3,
152 .hsync_len = 20,
153 .vsync_len = 3,
154 .sync = 0,
155 .vmode = FB_VMODE_NONINTERLACED
156 };
157
158 /* default modedb mode */
159 /* 640x480, 60 Hz, Non-Interlaced (25.172 MHz dotclock) */
160 static struct fb_videomode default_mode_CRT __devinitdata = {
161 .refresh = 60,
162 .xres = 640,
163 .yres = 480,
164 .pixclock = 39722,
165 .left_margin = 48,
166 .right_margin = 16,
167 .upper_margin = 33,
168 .lower_margin = 10,
169 .hsync_len = 96,
170 .vsync_len = 2,
171 .sync = 0,
172 .vmode = FB_VMODE_NONINTERLACED,
173 };
174 /* 1600x1024 SGI flatpanel 1600sw */
175 static struct fb_videomode default_mode_LCD __devinitdata = {
176 /* 1600x1024, 8 bpp */
177 .xres = 1600,
178 .yres = 1024,
179 .pixclock = 9353,
180 .left_margin = 20,
181 .right_margin = 30,
182 .upper_margin = 37,
183 .lower_margin = 3,
184 .hsync_len = 20,
185 .vsync_len = 3,
186 .vmode = FB_VMODE_NONINTERLACED,
187 };
188
189 static struct fb_videomode *default_mode __devinitdata = &default_mode_CRT;
190 static struct fb_var_screeninfo *default_var __devinitdata = &default_var_CRT;
191
192 static int flat_panel_enabled = 0;
193
194 static void gbe_reset(void)
195 {
196 /* Turn on dotclock PLL */
197 gbe->ctrlstat = 0x300aa000;
198 }
199
200
201 /*
202 * Function: gbe_turn_off
203 * Parameters: (None)
204 * Description: This should turn off the monitor and gbe. This is used
205 * when switching between the serial console and the graphics
206 * console.
207 */
208
209 static void gbe_turn_off(void)
210 {
211 int i;
212 unsigned int val, x, y, vpixen_off;
213
214 gbe_turned_on = 0;
215
216 /* check if pixel counter is on */
217 val = gbe->vt_xy;
218 if (GET_GBE_FIELD(VT_XY, FREEZE, val) == 1)
219 return;
220
221 /* turn off DMA */
222 val = gbe->ovr_control;
223 SET_GBE_FIELD(OVR_CONTROL, OVR_DMA_ENABLE, val, 0);
224 gbe->ovr_control = val;
225 udelay(1000);
226 val = gbe->frm_control;
227 SET_GBE_FIELD(FRM_CONTROL, FRM_DMA_ENABLE, val, 0);
228 gbe->frm_control = val;
229 udelay(1000);
230 val = gbe->did_control;
231 SET_GBE_FIELD(DID_CONTROL, DID_DMA_ENABLE, val, 0);
232 gbe->did_control = val;
233 udelay(1000);
234
235 /* We have to wait through two vertical retrace periods before
236 * the pixel DMA is turned off for sure. */
237 for (i = 0; i < 10000; i++) {
238 val = gbe->frm_inhwctrl;
239 if (GET_GBE_FIELD(FRM_INHWCTRL, FRM_DMA_ENABLE, val)) {
240 udelay(10);
241 } else {
242 val = gbe->ovr_inhwctrl;
243 if (GET_GBE_FIELD(OVR_INHWCTRL, OVR_DMA_ENABLE, val)) {
244 udelay(10);
245 } else {
246 val = gbe->did_inhwctrl;
247 if (GET_GBE_FIELD(DID_INHWCTRL, DID_DMA_ENABLE, val)) {
248 udelay(10);
249 } else
250 break;
251 }
252 }
253 }
254 if (i == 10000)
255 printk(KERN_ERR "gbefb: turn off DMA timed out\n");
256
257 /* wait for vpixen_off */
258 val = gbe->vt_vpixen;
259 vpixen_off = GET_GBE_FIELD(VT_VPIXEN, VPIXEN_OFF, val);
260
261 for (i = 0; i < 100000; i++) {
262 val = gbe->vt_xy;
263 x = GET_GBE_FIELD(VT_XY, X, val);
264 y = GET_GBE_FIELD(VT_XY, Y, val);
265 if (y < vpixen_off)
266 break;
267 udelay(1);
268 }
269 if (i == 100000)
270 printk(KERN_ERR
271 "gbefb: wait for vpixen_off timed out\n");
272 for (i = 0; i < 10000; i++) {
273 val = gbe->vt_xy;
274 x = GET_GBE_FIELD(VT_XY, X, val);
275 y = GET_GBE_FIELD(VT_XY, Y, val);
276 if (y > vpixen_off)
277 break;
278 udelay(1);
279 }
280 if (i == 10000)
281 printk(KERN_ERR "gbefb: wait for vpixen_off timed out\n");
282
283 /* turn off pixel counter */
284 val = 0;
285 SET_GBE_FIELD(VT_XY, FREEZE, val, 1);
286 gbe->vt_xy = val;
287 udelay(10000);
288 for (i = 0; i < 10000; i++) {
289 val = gbe->vt_xy;
290 if (GET_GBE_FIELD(VT_XY, FREEZE, val) != 1)
291 udelay(10);
292 else
293 break;
294 }
295 if (i == 10000)
296 printk(KERN_ERR "gbefb: turn off pixel clock timed out\n");
297
298 /* turn off dot clock */
299 val = gbe->dotclock;
300 SET_GBE_FIELD(DOTCLK, RUN, val, 0);
301 gbe->dotclock = val;
302 udelay(10000);
303 for (i = 0; i < 10000; i++) {
304 val = gbe->dotclock;
305 if (GET_GBE_FIELD(DOTCLK, RUN, val))
306 udelay(10);
307 else
308 break;
309 }
310 if (i == 10000)
311 printk(KERN_ERR "gbefb: turn off dotclock timed out\n");
312
313 /* reset the frame DMA FIFO */
314 val = gbe->frm_size_tile;
315 SET_GBE_FIELD(FRM_SIZE_TILE, FRM_FIFO_RESET, val, 1);
316 gbe->frm_size_tile = val;
317 SET_GBE_FIELD(FRM_SIZE_TILE, FRM_FIFO_RESET, val, 0);
318 gbe->frm_size_tile = val;
319 }
320
321 static void gbe_turn_on(void)
322 {
323 unsigned int val, i;
324
325 /*
326 * Check if pixel counter is off, for unknown reason this
327 * code hangs Visual Workstations
328 */
329 if (gbe_revision < 2) {
330 val = gbe->vt_xy;
331 if (GET_GBE_FIELD(VT_XY, FREEZE, val) == 0)
332 return;
333 }
334
335 /* turn on dot clock */
336 val = gbe->dotclock;
337 SET_GBE_FIELD(DOTCLK, RUN, val, 1);
338 gbe->dotclock = val;
339 udelay(10000);
340 for (i = 0; i < 10000; i++) {
341 val = gbe->dotclock;
342 if (GET_GBE_FIELD(DOTCLK, RUN, val) != 1)
343 udelay(10);
344 else
345 break;
346 }
347 if (i == 10000)
348 printk(KERN_ERR "gbefb: turn on dotclock timed out\n");
349
350 /* turn on pixel counter */
351 val = 0;
352 SET_GBE_FIELD(VT_XY, FREEZE, val, 0);
353 gbe->vt_xy = val;
354 udelay(10000);
355 for (i = 0; i < 10000; i++) {
356 val = gbe->vt_xy;
357 if (GET_GBE_FIELD(VT_XY, FREEZE, val))
358 udelay(10);
359 else
360 break;
361 }
362 if (i == 10000)
363 printk(KERN_ERR "gbefb: turn on pixel clock timed out\n");
364
365 /* turn on DMA */
366 val = gbe->frm_control;
367 SET_GBE_FIELD(FRM_CONTROL, FRM_DMA_ENABLE, val, 1);
368 gbe->frm_control = val;
369 udelay(1000);
370 for (i = 0; i < 10000; i++) {
371 val = gbe->frm_inhwctrl;
372 if (GET_GBE_FIELD(FRM_INHWCTRL, FRM_DMA_ENABLE, val) != 1)
373 udelay(10);
374 else
375 break;
376 }
377 if (i == 10000)
378 printk(KERN_ERR "gbefb: turn on DMA timed out\n");
379
380 gbe_turned_on = 1;
381 }
382
383 static void gbe_loadcmap(void)
384 {
385 int i, j;
386
387 for (i = 0; i < 256; i++) {
388 for (j = 0; j < 1000 && gbe->cm_fifo >= 63; j++)
389 udelay(10);
390 if (j == 1000)
391 printk(KERN_ERR "gbefb: cmap FIFO timeout\n");
392
393 gbe->cmap[i] = gbe_cmap[i];
394 }
395 }
396
397 /*
398 * Blank the display.
399 */
400 static int gbefb_blank(int blank, struct fb_info *info)
401 {
402 /* 0 unblank, 1 blank, 2 no vsync, 3 no hsync, 4 off */
403 switch (blank) {
404 case FB_BLANK_UNBLANK: /* unblank */
405 gbe_turn_on();
406 gbe_loadcmap();
407 break;
408
409 case FB_BLANK_NORMAL: /* blank */
410 gbe_turn_off();
411 break;
412
413 default:
414 /* Nothing */
415 break;
416 }
417 return 0;
418 }
419
420 /*
421 * Setup flatpanel related registers.
422 */
423 static void gbefb_setup_flatpanel(struct gbe_timing_info *timing)
424 {
425 int fp_wid, fp_hgt, fp_vbs, fp_vbe;
426 u32 outputVal = 0;
427
428 SET_GBE_FIELD(VT_FLAGS, HDRV_INVERT, outputVal,
429 (timing->flags & FB_SYNC_HOR_HIGH_ACT) ? 0 : 1);
430 SET_GBE_FIELD(VT_FLAGS, VDRV_INVERT, outputVal,
431 (timing->flags & FB_SYNC_VERT_HIGH_ACT) ? 0 : 1);
432 gbe->vt_flags = outputVal;
433
434 /* Turn on the flat panel */
435 fp_wid = 1600;
436 fp_hgt = 1024;
437 fp_vbs = 0;
438 fp_vbe = 1600;
439 timing->pll_m = 4;
440 timing->pll_n = 1;
441 timing->pll_p = 0;
442
443 outputVal = 0;
444 SET_GBE_FIELD(FP_DE, ON, outputVal, fp_vbs);
445 SET_GBE_FIELD(FP_DE, OFF, outputVal, fp_vbe);
446 gbe->fp_de = outputVal;
447 outputVal = 0;
448 SET_GBE_FIELD(FP_HDRV, OFF, outputVal, fp_wid);
449 gbe->fp_hdrv = outputVal;
450 outputVal = 0;
451 SET_GBE_FIELD(FP_VDRV, ON, outputVal, 1);
452 SET_GBE_FIELD(FP_VDRV, OFF, outputVal, fp_hgt + 1);
453 gbe->fp_vdrv = outputVal;
454 }
455
456 struct gbe_pll_info {
457 int clock_rate;
458 int fvco_min;
459 int fvco_max;
460 };
461
462 static struct gbe_pll_info gbe_pll_table[2] = {
463 { 20, 80, 220 },
464 { 27, 80, 220 },
465 };
466
467 static int compute_gbe_timing(struct fb_var_screeninfo *var,
468 struct gbe_timing_info *timing)
469 {
470 int pll_m, pll_n, pll_p, error, best_m, best_n, best_p, best_error;
471 int pixclock;
472 struct gbe_pll_info *gbe_pll;
473
474 if (gbe_revision < 2)
475 gbe_pll = &gbe_pll_table[0];
476 else
477 gbe_pll = &gbe_pll_table[1];
478
479 /* Determine valid resolution and timing
480 * GBE crystal runs at 20Mhz or 27Mhz
481 * pll_m, pll_n, pll_p define the following frequencies
482 * fvco = pll_m * 20Mhz / pll_n
483 * fout = fvco / (2**pll_p) */
484 best_error = 1000000000;
485 best_n = best_m = best_p = 0;
486 for (pll_p = 0; pll_p < 4; pll_p++)
487 for (pll_m = 1; pll_m < 256; pll_m++)
488 for (pll_n = 1; pll_n < 64; pll_n++) {
489 pixclock = (1000000 / gbe_pll->clock_rate) *
490 (pll_n << pll_p) / pll_m;
491
492 error = var->pixclock - pixclock;
493
494 if (error < 0)
495 error = -error;
496
497 if (error < best_error &&
498 pll_m / pll_n >
499 gbe_pll->fvco_min / gbe_pll->clock_rate &&
500 pll_m / pll_n <
501 gbe_pll->fvco_max / gbe_pll->clock_rate) {
502 best_error = error;
503 best_m = pll_m;
504 best_n = pll_n;
505 best_p = pll_p;
506 }
507 }
508
509 if (!best_n || !best_m)
510 return -EINVAL; /* Resolution to high */
511
512 pixclock = (1000000 / gbe_pll->clock_rate) *
513 (best_n << best_p) / best_m;
514
515 /* set video timing information */
516 if (timing) {
517 timing->width = var->xres;
518 timing->height = var->yres;
519 timing->pll_m = best_m;
520 timing->pll_n = best_n;
521 timing->pll_p = best_p;
522 timing->cfreq = gbe_pll->clock_rate * 1000 * timing->pll_m /
523 (timing->pll_n << timing->pll_p);
524 timing->htotal = var->left_margin + var->xres +
525 var->right_margin + var->hsync_len;
526 timing->vtotal = var->upper_margin + var->yres +
527 var->lower_margin + var->vsync_len;
528 timing->fields_sec = 1000 * timing->cfreq / timing->htotal *
529 1000 / timing->vtotal;
530 timing->hblank_start = var->xres;
531 timing->vblank_start = var->yres;
532 timing->hblank_end = timing->htotal;
533 timing->hsync_start = var->xres + var->right_margin + 1;
534 timing->hsync_end = timing->hsync_start + var->hsync_len;
535 timing->vblank_end = timing->vtotal;
536 timing->vsync_start = var->yres + var->lower_margin + 1;
537 timing->vsync_end = timing->vsync_start + var->vsync_len;
538 }
539
540 return pixclock;
541 }
542
543 static void gbe_set_timing_info(struct gbe_timing_info *timing)
544 {
545 int temp;
546 unsigned int val;
547
548 /* setup dot clock PLL */
549 val = 0;
550 SET_GBE_FIELD(DOTCLK, M, val, timing->pll_m - 1);
551 SET_GBE_FIELD(DOTCLK, N, val, timing->pll_n - 1);
552 SET_GBE_FIELD(DOTCLK, P, val, timing->pll_p);
553 SET_GBE_FIELD(DOTCLK, RUN, val, 0); /* do not start yet */
554 gbe->dotclock = val;
555 udelay(10000);
556
557 /* setup pixel counter */
558 val = 0;
559 SET_GBE_FIELD(VT_XYMAX, MAXX, val, timing->htotal);
560 SET_GBE_FIELD(VT_XYMAX, MAXY, val, timing->vtotal);
561 gbe->vt_xymax = val;
562
563 /* setup video timing signals */
564 val = 0;
565 SET_GBE_FIELD(VT_VSYNC, VSYNC_ON, val, timing->vsync_start);
566 SET_GBE_FIELD(VT_VSYNC, VSYNC_OFF, val, timing->vsync_end);
567 gbe->vt_vsync = val;
568 val = 0;
569 SET_GBE_FIELD(VT_HSYNC, HSYNC_ON, val, timing->hsync_start);
570 SET_GBE_FIELD(VT_HSYNC, HSYNC_OFF, val, timing->hsync_end);
571 gbe->vt_hsync = val;
572 val = 0;
573 SET_GBE_FIELD(VT_VBLANK, VBLANK_ON, val, timing->vblank_start);
574 SET_GBE_FIELD(VT_VBLANK, VBLANK_OFF, val, timing->vblank_end);
575 gbe->vt_vblank = val;
576 val = 0;
577 SET_GBE_FIELD(VT_HBLANK, HBLANK_ON, val,
578 timing->hblank_start - 5);
579 SET_GBE_FIELD(VT_HBLANK, HBLANK_OFF, val,
580 timing->hblank_end - 3);
581 gbe->vt_hblank = val;
582
583 /* setup internal timing signals */
584 val = 0;
585 SET_GBE_FIELD(VT_VCMAP, VCMAP_ON, val, timing->vblank_start);
586 SET_GBE_FIELD(VT_VCMAP, VCMAP_OFF, val, timing->vblank_end);
587 gbe->vt_vcmap = val;
588 val = 0;
589 SET_GBE_FIELD(VT_HCMAP, HCMAP_ON, val, timing->hblank_start);
590 SET_GBE_FIELD(VT_HCMAP, HCMAP_OFF, val, timing->hblank_end);
591 gbe->vt_hcmap = val;
592
593 val = 0;
594 temp = timing->vblank_start - timing->vblank_end - 1;
595 if (temp > 0)
596 temp = -temp;
597
598 if (flat_panel_enabled)
599 gbefb_setup_flatpanel(timing);
600
601 SET_GBE_FIELD(DID_START_XY, DID_STARTY, val, (u32) temp);
602 if (timing->hblank_end >= 20)
603 SET_GBE_FIELD(DID_START_XY, DID_STARTX, val,
604 timing->hblank_end - 20);
605 else
606 SET_GBE_FIELD(DID_START_XY, DID_STARTX, val,
607 timing->htotal - (20 - timing->hblank_end));
608 gbe->did_start_xy = val;
609
610 val = 0;
611 SET_GBE_FIELD(CRS_START_XY, CRS_STARTY, val, (u32) (temp + 1));
612 if (timing->hblank_end >= GBE_CRS_MAGIC)
613 SET_GBE_FIELD(CRS_START_XY, CRS_STARTX, val,
614 timing->hblank_end - GBE_CRS_MAGIC);
615 else
616 SET_GBE_FIELD(CRS_START_XY, CRS_STARTX, val,
617 timing->htotal - (GBE_CRS_MAGIC -
618 timing->hblank_end));
619 gbe->crs_start_xy = val;
620
621 val = 0;
622 SET_GBE_FIELD(VC_START_XY, VC_STARTY, val, (u32) temp);
623 SET_GBE_FIELD(VC_START_XY, VC_STARTX, val, timing->hblank_end - 4);
624 gbe->vc_start_xy = val;
625
626 val = 0;
627 temp = timing->hblank_end - GBE_PIXEN_MAGIC_ON;
628 if (temp < 0)
629 temp += timing->htotal; /* allow blank to wrap around */
630
631 SET_GBE_FIELD(VT_HPIXEN, HPIXEN_ON, val, temp);
632 SET_GBE_FIELD(VT_HPIXEN, HPIXEN_OFF, val,
633 ((temp + timing->width -
634 GBE_PIXEN_MAGIC_OFF) % timing->htotal));
635 gbe->vt_hpixen = val;
636
637 val = 0;
638 SET_GBE_FIELD(VT_VPIXEN, VPIXEN_ON, val, timing->vblank_end);
639 SET_GBE_FIELD(VT_VPIXEN, VPIXEN_OFF, val, timing->vblank_start);
640 gbe->vt_vpixen = val;
641
642 /* turn off sync on green */
643 val = 0;
644 SET_GBE_FIELD(VT_FLAGS, SYNC_LOW, val, 1);
645 gbe->vt_flags = val;
646 }
647
648 /*
649 * Set the hardware according to 'par'.
650 */
651
652 static int gbefb_set_par(struct fb_info *info)
653 {
654 int i;
655 unsigned int val;
656 int wholeTilesX, partTilesX, maxPixelsPerTileX;
657 int height_pix;
658 int xpmax, ypmax; /* Monitor resolution */
659 int bytesPerPixel; /* Bytes per pixel */
660 struct gbefb_par *par = (struct gbefb_par *) info->par;
661
662 compute_gbe_timing(&info->var, &par->timing);
663
664 bytesPerPixel = info->var.bits_per_pixel / 8;
665 info->fix.line_length = info->var.xres_virtual * bytesPerPixel;
666 xpmax = par->timing.width;
667 ypmax = par->timing.height;
668
669 /* turn off GBE */
670 gbe_turn_off();
671
672 /* set timing info */
673 gbe_set_timing_info(&par->timing);
674
675 /* initialize DIDs */
676 val = 0;
677 switch (bytesPerPixel) {
678 case 1:
679 SET_GBE_FIELD(WID, TYP, val, GBE_CMODE_I8);
680 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
681 break;
682 case 2:
683 SET_GBE_FIELD(WID, TYP, val, GBE_CMODE_ARGB5);
684 info->fix.visual = FB_VISUAL_TRUECOLOR;
685 break;
686 case 4:
687 SET_GBE_FIELD(WID, TYP, val, GBE_CMODE_RGB8);
688 info->fix.visual = FB_VISUAL_TRUECOLOR;
689 break;
690 }
691 SET_GBE_FIELD(WID, BUF, val, GBE_BMODE_BOTH);
692
693 for (i = 0; i < 32; i++)
694 gbe->mode_regs[i] = val;
695
696 /* Initialize interrupts */
697 gbe->vt_intr01 = 0xffffffff;
698 gbe->vt_intr23 = 0xffffffff;
699
700 /* HACK:
701 The GBE hardware uses a tiled memory to screen mapping. Tiles are
702 blocks of 512x128, 256x128 or 128x128 pixels, respectively for 8bit,
703 16bit and 32 bit modes (64 kB). They cover the screen with partial
704 tiles on the right and/or bottom of the screen if needed.
705 For example in 640x480 8 bit mode the mapping is:
706
707 <-------- 640 ----->
708 <---- 512 ----><128|384 offscreen>
709 ^ ^
710 | 128 [tile 0] [tile 1]
711 | v
712 ^
713 4 128 [tile 2] [tile 3]
714 8 v
715 0 ^
716 128 [tile 4] [tile 5]
717 | v
718 | ^
719 v 96 [tile 6] [tile 7]
720 32 offscreen
721
722 Tiles have the advantage that they can be allocated individually in
723 memory. However, this mapping is not linear at all, which is not
724 really convenient. In order to support linear addressing, the GBE
725 DMA hardware is fooled into thinking the screen is only one tile
726 large and but has a greater height, so that the DMA transfer covers
727 the same region.
728 Tiles are still allocated as independent chunks of 64KB of
729 continuous physical memory and remapped so that the kernel sees the
730 framebuffer as a continuous virtual memory. The GBE tile table is
731 set up so that each tile references one of these 64k blocks:
732
733 GBE -> tile list framebuffer TLB <------------ CPU
734 [ tile 0 ] -> [ 64KB ] <- [ 16x 4KB page entries ] ^
735 ... ... ... linear virtual FB
736 [ tile n ] -> [ 64KB ] <- [ 16x 4KB page entries ] v
737
738
739 The GBE hardware is then told that the buffer is 512*tweaked_height,
740 with tweaked_height = real_width*real_height/pixels_per_tile.
741 Thus the GBE hardware will scan the first tile, filing the first 64k
742 covered region of the screen, and then will proceed to the next
743 tile, until the whole screen is covered.
744
745 Here is what would happen at 640x480 8bit:
746
747 normal tiling linear
748 ^ 11111111111111112222 11111111111111111111 ^
749 128 11111111111111112222 11111111111111111111 102 lines
750 11111111111111112222 11111111111111111111 v
751 V 11111111111111112222 11111111222222222222
752 33333333333333334444 22222222222222222222
753 33333333333333334444 22222222222222222222
754 < 512 > < 256 > 102*640+256 = 64k
755
756 NOTE: The only mode for which this is not working is 800x600 8bit,
757 as 800*600/512 = 937.5 which is not integer and thus causes
758 flickering.
759 I guess this is not so important as one can use 640x480 8bit or
760 800x600 16bit anyway.
761 */
762
763 /* Tell gbe about the tiles table location */
764 /* tile_ptr -> [ tile 1 ] -> FB mem */
765 /* [ tile 2 ] -> FB mem */
766 /* ... */
767 val = 0;
768 SET_GBE_FIELD(FRM_CONTROL, FRM_TILE_PTR, val, gbe_tiles.dma >> 9);
769 SET_GBE_FIELD(FRM_CONTROL, FRM_DMA_ENABLE, val, 0); /* do not start */
770 SET_GBE_FIELD(FRM_CONTROL, FRM_LINEAR, val, 0);
771 gbe->frm_control = val;
772
773 maxPixelsPerTileX = 512 / bytesPerPixel;
774 wholeTilesX = 1;
775 partTilesX = 0;
776
777 /* Initialize the framebuffer */
778 val = 0;
779 SET_GBE_FIELD(FRM_SIZE_TILE, FRM_WIDTH_TILE, val, wholeTilesX);
780 SET_GBE_FIELD(FRM_SIZE_TILE, FRM_RHS, val, partTilesX);
781
782 switch (bytesPerPixel) {
783 case 1:
784 SET_GBE_FIELD(FRM_SIZE_TILE, FRM_DEPTH, val,
785 GBE_FRM_DEPTH_8);
786 break;
787 case 2:
788 SET_GBE_FIELD(FRM_SIZE_TILE, FRM_DEPTH, val,
789 GBE_FRM_DEPTH_16);
790 break;
791 case 4:
792 SET_GBE_FIELD(FRM_SIZE_TILE, FRM_DEPTH, val,
793 GBE_FRM_DEPTH_32);
794 break;
795 }
796 gbe->frm_size_tile = val;
797
798 /* compute tweaked height */
799 height_pix = xpmax * ypmax / maxPixelsPerTileX;
800
801 val = 0;
802 SET_GBE_FIELD(FRM_SIZE_PIXEL, FB_HEIGHT_PIX, val, height_pix);
803 gbe->frm_size_pixel = val;
804
805 /* turn off DID and overlay DMA */
806 gbe->did_control = 0;
807 gbe->ovr_width_tile = 0;
808
809 /* Turn off mouse cursor */
810 gbe->crs_ctl = 0;
811
812 /* Turn on GBE */
813 gbe_turn_on();
814
815 /* Initialize the gamma map */
816 udelay(10);
817 for (i = 0; i < 256; i++)
818 gbe->gmap[i] = (i << 24) | (i << 16) | (i << 8);
819
820 /* Initialize the color map */
821 for (i = 0; i < 256; i++)
822 gbe_cmap[i] = (i << 8) | (i << 16) | (i << 24);
823
824 gbe_loadcmap();
825
826 return 0;
827 }
828
829 static void gbefb_encode_fix(struct fb_fix_screeninfo *fix,
830 struct fb_var_screeninfo *var)
831 {
832 memset(fix, 0, sizeof(struct fb_fix_screeninfo));
833 strcpy(fix->id, "SGI GBE");
834 fix->smem_start = (unsigned long) gbe_mem;
835 fix->smem_len = gbe_mem_size;
836 fix->type = FB_TYPE_PACKED_PIXELS;
837 fix->type_aux = 0;
838 fix->accel = FB_ACCEL_NONE;
839 switch (var->bits_per_pixel) {
840 case 8:
841 fix->visual = FB_VISUAL_PSEUDOCOLOR;
842 break;
843 default:
844 fix->visual = FB_VISUAL_TRUECOLOR;
845 break;
846 }
847 fix->ywrapstep = 0;
848 fix->xpanstep = 0;
849 fix->ypanstep = 0;
850 fix->line_length = var->xres_virtual * var->bits_per_pixel / 8;
851 fix->mmio_start = GBE_BASE;
852 fix->mmio_len = sizeof(struct sgi_gbe);
853 }
854
855 /*
856 * Set a single color register. The values supplied are already
857 * rounded down to the hardware's capabilities (according to the
858 * entries in the var structure). Return != 0 for invalid regno.
859 */
860
861 static int gbefb_setcolreg(unsigned regno, unsigned red, unsigned green,
862 unsigned blue, unsigned transp,
863 struct fb_info *info)
864 {
865 int i;
866
867 if (regno > 255)
868 return 1;
869 red >>= 8;
870 green >>= 8;
871 blue >>= 8;
872
873 if (info->var.bits_per_pixel <= 8) {
874 gbe_cmap[regno] = (red << 24) | (green << 16) | (blue << 8);
875 if (gbe_turned_on) {
876 /* wait for the color map FIFO to have a free entry */
877 for (i = 0; i < 1000 && gbe->cm_fifo >= 63; i++)
878 udelay(10);
879 if (i == 1000) {
880 printk(KERN_ERR "gbefb: cmap FIFO timeout\n");
881 return 1;
882 }
883 gbe->cmap[regno] = gbe_cmap[regno];
884 }
885 } else if (regno < 16) {
886 switch (info->var.bits_per_pixel) {
887 case 15:
888 case 16:
889 red >>= 3;
890 green >>= 3;
891 blue >>= 3;
892 pseudo_palette[regno] =
893 (red << info->var.red.offset) |
894 (green << info->var.green.offset) |
895 (blue << info->var.blue.offset);
896 break;
897 case 32:
898 pseudo_palette[regno] =
899 (red << info->var.red.offset) |
900 (green << info->var.green.offset) |
901 (blue << info->var.blue.offset);
902 break;
903 }
904 }
905
906 return 0;
907 }
908
909 /*
910 * Check video mode validity, eventually modify var to best match.
911 */
912 static int gbefb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
913 {
914 unsigned int line_length;
915 struct gbe_timing_info timing;
916 int ret;
917
918 /* Limit bpp to 8, 16, and 32 */
919 if (var->bits_per_pixel <= 8)
920 var->bits_per_pixel = 8;
921 else if (var->bits_per_pixel <= 16)
922 var->bits_per_pixel = 16;
923 else if (var->bits_per_pixel <= 32)
924 var->bits_per_pixel = 32;
925 else
926 return -EINVAL;
927
928 /* Check the mode can be mapped linearly with the tile table trick. */
929 /* This requires width x height x bytes/pixel be a multiple of 512 */
930 if ((var->xres * var->yres * var->bits_per_pixel) & 4095)
931 return -EINVAL;
932
933 var->grayscale = 0; /* No grayscale for now */
934
935 ret = compute_gbe_timing(var, &timing);
936 var->pixclock = ret;
937 if (ret < 0)
938 return -EINVAL;
939
940 /* Adjust virtual resolution, if necessary */
941 if (var->xres > var->xres_virtual || (!ywrap && !ypan))
942 var->xres_virtual = var->xres;
943 if (var->yres > var->yres_virtual || (!ywrap && !ypan))
944 var->yres_virtual = var->yres;
945
946 if (var->vmode & FB_VMODE_CONUPDATE) {
947 var->vmode |= FB_VMODE_YWRAP;
948 var->xoffset = info->var.xoffset;
949 var->yoffset = info->var.yoffset;
950 }
951
952 /* No grayscale for now */
953 var->grayscale = 0;
954
955 /* Memory limit */
956 line_length = var->xres_virtual * var->bits_per_pixel / 8;
957 if (line_length * var->yres_virtual > gbe_mem_size)
958 return -ENOMEM; /* Virtual resolution too high */
959
960 switch (var->bits_per_pixel) {
961 case 8:
962 var->red.offset = 0;
963 var->red.length = 8;
964 var->green.offset = 0;
965 var->green.length = 8;
966 var->blue.offset = 0;
967 var->blue.length = 8;
968 var->transp.offset = 0;
969 var->transp.length = 0;
970 break;
971 case 16: /* RGB 1555 */
972 var->red.offset = 10;
973 var->red.length = 5;
974 var->green.offset = 5;
975 var->green.length = 5;
976 var->blue.offset = 0;
977 var->blue.length = 5;
978 var->transp.offset = 0;
979 var->transp.length = 0;
980 break;
981 case 32: /* RGB 8888 */
982 var->red.offset = 24;
983 var->red.length = 8;
984 var->green.offset = 16;
985 var->green.length = 8;
986 var->blue.offset = 8;
987 var->blue.length = 8;
988 var->transp.offset = 0;
989 var->transp.length = 8;
990 break;
991 }
992 var->red.msb_right = 0;
993 var->green.msb_right = 0;
994 var->blue.msb_right = 0;
995 var->transp.msb_right = 0;
996
997 var->left_margin = timing.htotal - timing.hsync_end;
998 var->right_margin = timing.hsync_start - timing.width;
999 var->upper_margin = timing.vtotal - timing.vsync_end;
1000 var->lower_margin = timing.vsync_start - timing.height;
1001 var->hsync_len = timing.hsync_end - timing.hsync_start;
1002 var->vsync_len = timing.vsync_end - timing.vsync_start;
1003
1004 return 0;
1005 }
1006
1007 static int gbefb_mmap(struct fb_info *info,
1008 struct vm_area_struct *vma)
1009 {
1010 unsigned long size = vma->vm_end - vma->vm_start;
1011 unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
1012 unsigned long addr;
1013 unsigned long phys_addr, phys_size;
1014 u16 *tile;
1015
1016 /* check range */
1017 if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1018 return -EINVAL;
1019 if (offset + size > gbe_mem_size)
1020 return -EINVAL;
1021
1022 /* remap using the fastest write-through mode on architecture */
1023 /* try not polluting the cache when possible */
1024 pgprot_val(vma->vm_page_prot) =
1025 pgprot_fb(pgprot_val(vma->vm_page_prot));
1026
1027 vma->vm_flags |= VM_IO | VM_RESERVED;
1028
1029 /* look for the starting tile */
1030 tile = &gbe_tiles.cpu[offset >> TILE_SHIFT];
1031 addr = vma->vm_start;
1032 offset &= TILE_MASK;
1033
1034 /* remap each tile separately */
1035 do {
1036 phys_addr = (((unsigned long) (*tile)) << TILE_SHIFT) + offset;
1037 if ((offset + size) < TILE_SIZE)
1038 phys_size = size;
1039 else
1040 phys_size = TILE_SIZE - offset;
1041
1042 if (remap_pfn_range(vma, addr, phys_addr >> PAGE_SHIFT,
1043 phys_size, vma->vm_page_prot))
1044 return -EAGAIN;
1045
1046 offset = 0;
1047 size -= phys_size;
1048 addr += phys_size;
1049 tile++;
1050 } while (size);
1051
1052 return 0;
1053 }
1054
1055 static struct fb_ops gbefb_ops = {
1056 .owner = THIS_MODULE,
1057 .fb_check_var = gbefb_check_var,
1058 .fb_set_par = gbefb_set_par,
1059 .fb_setcolreg = gbefb_setcolreg,
1060 .fb_mmap = gbefb_mmap,
1061 .fb_blank = gbefb_blank,
1062 .fb_fillrect = cfb_fillrect,
1063 .fb_copyarea = cfb_copyarea,
1064 .fb_imageblit = cfb_imageblit,
1065 };
1066
1067 /*
1068 * sysfs
1069 */
1070
1071 static ssize_t gbefb_show_memsize(struct device *dev, struct device_attribute *attr, char *buf)
1072 {
1073 return snprintf(buf, PAGE_SIZE, "%d\n", gbe_mem_size);
1074 }
1075
1076 static DEVICE_ATTR(size, S_IRUGO, gbefb_show_memsize, NULL);
1077
1078 static ssize_t gbefb_show_rev(struct device *device, struct device_attribute *attr, char *buf)
1079 {
1080 return snprintf(buf, PAGE_SIZE, "%d\n", gbe_revision);
1081 }
1082
1083 static DEVICE_ATTR(revision, S_IRUGO, gbefb_show_rev, NULL);
1084
1085 static void __devexit gbefb_remove_sysfs(struct device *dev)
1086 {
1087 device_remove_file(dev, &dev_attr_size);
1088 device_remove_file(dev, &dev_attr_revision);
1089 }
1090
1091 static void gbefb_create_sysfs(struct device *dev)
1092 {
1093 device_create_file(dev, &dev_attr_size);
1094 device_create_file(dev, &dev_attr_revision);
1095 }
1096
1097 /*
1098 * Initialization
1099 */
1100
1101 static int __devinit gbefb_setup(char *options)
1102 {
1103 char *this_opt;
1104
1105 if (!options || !*options)
1106 return 0;
1107
1108 while ((this_opt = strsep(&options, ",")) != NULL) {
1109 if (!strncmp(this_opt, "monitor:", 8)) {
1110 if (!strncmp(this_opt + 8, "crt", 3)) {
1111 flat_panel_enabled = 0;
1112 default_var = &default_var_CRT;
1113 default_mode = &default_mode_CRT;
1114 } else if (!strncmp(this_opt + 8, "1600sw", 6) ||
1115 !strncmp(this_opt + 8, "lcd", 3)) {
1116 flat_panel_enabled = 1;
1117 default_var = &default_var_LCD;
1118 default_mode = &default_mode_LCD;
1119 }
1120 } else if (!strncmp(this_opt, "mem:", 4)) {
1121 gbe_mem_size = memparse(this_opt + 4, &this_opt);
1122 if (gbe_mem_size > CONFIG_FB_GBE_MEM * 1024 * 1024)
1123 gbe_mem_size = CONFIG_FB_GBE_MEM * 1024 * 1024;
1124 if (gbe_mem_size < TILE_SIZE)
1125 gbe_mem_size = TILE_SIZE;
1126 } else
1127 mode_option = this_opt;
1128 }
1129 return 0;
1130 }
1131
1132 static int __devinit gbefb_probe(struct platform_device *p_dev)
1133 {
1134 int i, ret = 0;
1135 struct fb_info *info;
1136 struct gbefb_par *par;
1137 #ifndef MODULE
1138 char *options = NULL;
1139 #endif
1140
1141 info = framebuffer_alloc(sizeof(struct gbefb_par), &p_dev->dev);
1142 if (!info)
1143 return -ENOMEM;
1144
1145 #ifndef MODULE
1146 if (fb_get_options("gbefb", &options)) {
1147 ret = -ENODEV;
1148 goto out_release_framebuffer;
1149 }
1150 gbefb_setup(options);
1151 #endif
1152
1153 if (!request_mem_region(GBE_BASE, sizeof(struct sgi_gbe), "GBE")) {
1154 printk(KERN_ERR "gbefb: couldn't reserve mmio region\n");
1155 ret = -EBUSY;
1156 goto out_release_framebuffer;
1157 }
1158
1159 gbe = (struct sgi_gbe *) ioremap(GBE_BASE, sizeof(struct sgi_gbe));
1160 if (!gbe) {
1161 printk(KERN_ERR "gbefb: couldn't map mmio region\n");
1162 ret = -ENXIO;
1163 goto out_release_mem_region;
1164 }
1165 gbe_revision = gbe->ctrlstat & 15;
1166
1167 gbe_tiles.cpu =
1168 dma_alloc_coherent(NULL, GBE_TLB_SIZE * sizeof(uint16_t),
1169 &gbe_tiles.dma, GFP_KERNEL);
1170 if (!gbe_tiles.cpu) {
1171 printk(KERN_ERR "gbefb: couldn't allocate tiles table\n");
1172 ret = -ENOMEM;
1173 goto out_unmap;
1174 }
1175
1176 if (gbe_mem_phys) {
1177 /* memory was allocated at boot time */
1178 gbe_mem = ioremap_nocache(gbe_mem_phys, gbe_mem_size);
1179 if (!gbe_mem) {
1180 printk(KERN_ERR "gbefb: couldn't map framebuffer\n");
1181 ret = -ENOMEM;
1182 goto out_tiles_free;
1183 }
1184
1185 gbe_dma_addr = 0;
1186 } else {
1187 /* try to allocate memory with the classical allocator
1188 * this has high chance to fail on low memory machines */
1189 gbe_mem = dma_alloc_coherent(NULL, gbe_mem_size, &gbe_dma_addr,
1190 GFP_KERNEL);
1191 if (!gbe_mem) {
1192 printk(KERN_ERR "gbefb: couldn't allocate framebuffer memory\n");
1193 ret = -ENOMEM;
1194 goto out_tiles_free;
1195 }
1196
1197 gbe_mem_phys = (unsigned long) gbe_dma_addr;
1198 }
1199
1200 #ifdef CONFIG_X86
1201 mtrr_add(gbe_mem_phys, gbe_mem_size, MTRR_TYPE_WRCOMB, 1);
1202 #endif
1203
1204 /* map framebuffer memory into tiles table */
1205 for (i = 0; i < (gbe_mem_size >> TILE_SHIFT); i++)
1206 gbe_tiles.cpu[i] = (gbe_mem_phys >> TILE_SHIFT) + i;
1207
1208 info->fbops = &gbefb_ops;
1209 info->pseudo_palette = pseudo_palette;
1210 info->flags = FBINFO_DEFAULT;
1211 info->screen_base = gbe_mem;
1212 fb_alloc_cmap(&info->cmap, 256, 0);
1213
1214 /* reset GBE */
1215 gbe_reset();
1216
1217 par = info->par;
1218 /* turn on default video mode */
1219 if (fb_find_mode(&par->var, info, mode_option, NULL, 0,
1220 default_mode, 8) == 0)
1221 par->var = *default_var;
1222 info->var = par->var;
1223 gbefb_check_var(&par->var, info);
1224 gbefb_encode_fix(&info->fix, &info->var);
1225
1226 if (register_framebuffer(info) < 0) {
1227 printk(KERN_ERR "gbefb: couldn't register framebuffer\n");
1228 ret = -ENXIO;
1229 goto out_gbe_unmap;
1230 }
1231
1232 platform_set_drvdata(p_dev, info);
1233 gbefb_create_sysfs(&p_dev->dev);
1234
1235 printk(KERN_INFO "fb%d: %s rev %d @ 0x%08x using %dkB memory\n",
1236 info->node, info->fix.id, gbe_revision, (unsigned) GBE_BASE,
1237 gbe_mem_size >> 10);
1238
1239 return 0;
1240
1241 out_gbe_unmap:
1242 if (gbe_dma_addr)
1243 dma_free_coherent(NULL, gbe_mem_size, gbe_mem, gbe_mem_phys);
1244 else
1245 iounmap(gbe_mem);
1246 out_tiles_free:
1247 dma_free_coherent(NULL, GBE_TLB_SIZE * sizeof(uint16_t),
1248 (void *)gbe_tiles.cpu, gbe_tiles.dma);
1249 out_unmap:
1250 iounmap(gbe);
1251 out_release_mem_region:
1252 release_mem_region(GBE_BASE, sizeof(struct sgi_gbe));
1253 out_release_framebuffer:
1254 framebuffer_release(info);
1255
1256 return ret;
1257 }
1258
1259 static int __devexit gbefb_remove(struct platform_device* p_dev)
1260 {
1261 struct fb_info *info = platform_get_drvdata(p_dev);
1262
1263 unregister_framebuffer(info);
1264 gbe_turn_off();
1265 if (gbe_dma_addr)
1266 dma_free_coherent(NULL, gbe_mem_size, gbe_mem, gbe_mem_phys);
1267 else
1268 iounmap(gbe_mem);
1269 dma_free_coherent(NULL, GBE_TLB_SIZE * sizeof(uint16_t),
1270 (void *)gbe_tiles.cpu, gbe_tiles.dma);
1271 release_mem_region(GBE_BASE, sizeof(struct sgi_gbe));
1272 iounmap(gbe);
1273 gbefb_remove_sysfs(&p_dev->dev);
1274 framebuffer_release(info);
1275
1276 return 0;
1277 }
1278
1279 static struct platform_driver gbefb_driver = {
1280 .probe = gbefb_probe,
1281 .remove = __devexit_p(gbefb_remove),
1282 .driver = {
1283 .name = "gbefb",
1284 },
1285 };
1286
1287 static struct platform_device *gbefb_device;
1288
1289 static int __init gbefb_init(void)
1290 {
1291 int ret = platform_driver_register(&gbefb_driver);
1292 if (!ret) {
1293 gbefb_device = platform_device_alloc("gbefb", 0);
1294 if (gbefb_device) {
1295 ret = platform_device_add(gbefb_device);
1296 } else {
1297 ret = -ENOMEM;
1298 }
1299 if (ret) {
1300 platform_device_put(gbefb_device);
1301 platform_driver_unregister(&gbefb_driver);
1302 }
1303 }
1304 return ret;
1305 }
1306
1307 static void __exit gbefb_exit(void)
1308 {
1309 platform_device_unregister(gbefb_device);
1310 platform_driver_unregister(&gbefb_driver);
1311 }
1312
1313 module_init(gbefb_init);
1314 module_exit(gbefb_exit);
1315
1316 MODULE_LICENSE("GPL");
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