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