1 /* tcx.c: TCX frame buffer driver
2 *
3 * Copyright (C) 2003, 2006 David S. Miller (davem@davemloft.net)
4 * Copyright (C) 1996,1998 Jakub Jelinek (jj@ultra.linux.cz)
5 * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
6 * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
7 *
8 * Driver layout based loosely on tgafb.c, see that file for credits.
9 */
10
11 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/errno.h>
14 #include <linux/string.h>
15 #include <linux/slab.h>
16 #include <linux/delay.h>
17 #include <linux/init.h>
18 #include <linux/fb.h>
19 #include <linux/mm.h>
20
21 #include <asm/io.h>
22 #include <asm/prom.h>
23 #include <asm/of_device.h>
24 #include <asm/fbio.h>
25
26 #include "sbuslib.h"
27
28 /*
29 * Local functions.
30 */
31
32 static int tcx_setcolreg(unsigned, unsigned, unsigned, unsigned,
33 unsigned, struct fb_info *);
34 static int tcx_blank(int, struct fb_info *);
35
36 static int tcx_mmap(struct fb_info *, struct vm_area_struct *);
37 static int tcx_ioctl(struct fb_info *, unsigned int, unsigned long);
38 static int tcx_pan_display(struct fb_var_screeninfo *, struct fb_info *);
39
40 /*
41 * Frame buffer operations
42 */
43
44 static struct fb_ops tcx_ops = {
45 .owner = THIS_MODULE,
46 .fb_setcolreg = tcx_setcolreg,
47 .fb_blank = tcx_blank,
48 .fb_pan_display = tcx_pan_display,
49 .fb_fillrect = cfb_fillrect,
50 .fb_copyarea = cfb_copyarea,
51 .fb_imageblit = cfb_imageblit,
52 .fb_mmap = tcx_mmap,
53 .fb_ioctl = tcx_ioctl,
54 #ifdef CONFIG_COMPAT
55 .fb_compat_ioctl = sbusfb_compat_ioctl,
56 #endif
57 };
58
59 /* THC definitions */
60 #define TCX_THC_MISC_REV_SHIFT 16
61 #define TCX_THC_MISC_REV_MASK 15
62 #define TCX_THC_MISC_VSYNC_DIS (1 << 25)
63 #define TCX_THC_MISC_HSYNC_DIS (1 << 24)
64 #define TCX_THC_MISC_RESET (1 << 12)
65 #define TCX_THC_MISC_VIDEO (1 << 10)
66 #define TCX_THC_MISC_SYNC (1 << 9)
67 #define TCX_THC_MISC_VSYNC (1 << 8)
68 #define TCX_THC_MISC_SYNC_ENAB (1 << 7)
69 #define TCX_THC_MISC_CURS_RES (1 << 6)
70 #define TCX_THC_MISC_INT_ENAB (1 << 5)
71 #define TCX_THC_MISC_INT (1 << 4)
72 #define TCX_THC_MISC_INIT 0x9f
73 #define TCX_THC_REV_REV_SHIFT 20
74 #define TCX_THC_REV_REV_MASK 15
75 #define TCX_THC_REV_MINREV_SHIFT 28
76 #define TCX_THC_REV_MINREV_MASK 15
77
78 /* The contents are unknown */
79 struct tcx_tec {
80 u32 tec_matrix;
81 u32 tec_clip;
82 u32 tec_vdc;
83 };
84
85 struct tcx_thc {
86 u32 thc_rev;
87 u32 thc_pad0[511];
88 u32 thc_hs; /* hsync timing */
89 u32 thc_hsdvs;
90 u32 thc_hd;
91 u32 thc_vs; /* vsync timing */
92 u32 thc_vd;
93 u32 thc_refresh;
94 u32 thc_misc;
95 u32 thc_pad1[56];
96 u32 thc_cursxy; /* cursor x,y position (16 bits each) */
97 u32 thc_cursmask[32]; /* cursor mask bits */
98 u32 thc_cursbits[32]; /* what to show where mask enabled */
99 };
100
101 struct bt_regs {
102 u32 addr;
103 u32 color_map;
104 u32 control;
105 u32 cursor;
106 };
107
108 #define TCX_MMAP_ENTRIES 14
109
110 struct tcx_par {
111 spinlock_t lock;
112 struct bt_regs __iomem *bt;
113 struct tcx_thc __iomem *thc;
114 struct tcx_tec __iomem *tec;
115 u32 __iomem *cplane;
116
117 u32 flags;
118 #define TCX_FLAG_BLANKED 0x00000001
119
120 unsigned long physbase;
121 unsigned long which_io;
122 unsigned long fbsize;
123
124 struct sbus_mmap_map mmap_map[TCX_MMAP_ENTRIES];
125 int lowdepth;
126 };
127
128 /* Reset control plane so that WID is 8-bit plane. */
129 static void __tcx_set_control_plane (struct tcx_par *par)
130 {
131 u32 __iomem *p, *pend;
132
133 if (par->lowdepth)
134 return;
135
136 p = par->cplane;
137 if (p == NULL)
138 return;
139 for (pend = p + par->fbsize; p < pend; p++) {
140 u32 tmp = sbus_readl(p);
141
142 tmp &= 0xffffff;
143 sbus_writel(tmp, p);
144 }
145 }
146
147 static void tcx_reset (struct fb_info *info)
148 {
149 struct tcx_par *par = (struct tcx_par *) info->par;
150 unsigned long flags;
151
152 spin_lock_irqsave(&par->lock, flags);
153 __tcx_set_control_plane(par);
154 spin_unlock_irqrestore(&par->lock, flags);
155 }
156
157 static int tcx_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
158 {
159 tcx_reset(info);
160 return 0;
161 }
162
163 /**
164 * tcx_setcolreg - Optional function. Sets a color register.
165 * @regno: boolean, 0 copy local, 1 get_user() function
166 * @red: frame buffer colormap structure
167 * @green: The green value which can be up to 16 bits wide
168 * @blue: The blue value which can be up to 16 bits wide.
169 * @transp: If supported the alpha value which can be up to 16 bits wide.
170 * @info: frame buffer info structure
171 */
172 static int tcx_setcolreg(unsigned regno,
173 unsigned red, unsigned green, unsigned blue,
174 unsigned transp, struct fb_info *info)
175 {
176 struct tcx_par *par = (struct tcx_par *) info->par;
177 struct bt_regs __iomem *bt = par->bt;
178 unsigned long flags;
179
180 if (regno >= 256)
181 return 1;
182
183 red >>= 8;
184 green >>= 8;
185 blue >>= 8;
186
187 spin_lock_irqsave(&par->lock, flags);
188
189 sbus_writel(regno << 24, &bt->addr);
190 sbus_writel(red << 24, &bt->color_map);
191 sbus_writel(green << 24, &bt->color_map);
192 sbus_writel(blue << 24, &bt->color_map);
193
194 spin_unlock_irqrestore(&par->lock, flags);
195
196 return 0;
197 }
198
199 /**
200 * tcx_blank - Optional function. Blanks the display.
201 * @blank_mode: the blank mode we want.
202 * @info: frame buffer structure that represents a single frame buffer
203 */
204 static int
205 tcx_blank(int blank, struct fb_info *info)
206 {
207 struct tcx_par *par = (struct tcx_par *) info->par;
208 struct tcx_thc __iomem *thc = par->thc;
209 unsigned long flags;
210 u32 val;
211
212 spin_lock_irqsave(&par->lock, flags);
213
214 val = sbus_readl(&thc->thc_misc);
215
216 switch (blank) {
217 case FB_BLANK_UNBLANK: /* Unblanking */
218 val &= ~(TCX_THC_MISC_VSYNC_DIS |
219 TCX_THC_MISC_HSYNC_DIS);
220 val |= TCX_THC_MISC_VIDEO;
221 par->flags &= ~TCX_FLAG_BLANKED;
222 break;
223
224 case FB_BLANK_NORMAL: /* Normal blanking */
225 val &= ~TCX_THC_MISC_VIDEO;
226 par->flags |= TCX_FLAG_BLANKED;
227 break;
228
229 case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */
230 val |= TCX_THC_MISC_VSYNC_DIS;
231 break;
232 case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
233 val |= TCX_THC_MISC_HSYNC_DIS;
234 break;
235
236 case FB_BLANK_POWERDOWN: /* Poweroff */
237 break;
238 };
239
240 sbus_writel(val, &thc->thc_misc);
241
242 spin_unlock_irqrestore(&par->lock, flags);
243
244 return 0;
245 }
246
247 static struct sbus_mmap_map __tcx_mmap_map[TCX_MMAP_ENTRIES] = {
248 {
249 .voff = TCX_RAM8BIT,
250 .size = SBUS_MMAP_FBSIZE(1)
251 },
252 {
253 .voff = TCX_RAM24BIT,
254 .size = SBUS_MMAP_FBSIZE(4)
255 },
256 {
257 .voff = TCX_UNK3,
258 .size = SBUS_MMAP_FBSIZE(8)
259 },
260 {
261 .voff = TCX_UNK4,
262 .size = SBUS_MMAP_FBSIZE(8)
263 },
264 {
265 .voff = TCX_CONTROLPLANE,
266 .size = SBUS_MMAP_FBSIZE(4)
267 },
268 {
269 .voff = TCX_UNK6,
270 .size = SBUS_MMAP_FBSIZE(8)
271 },
272 {
273 .voff = TCX_UNK7,
274 .size = SBUS_MMAP_FBSIZE(8)
275 },
276 {
277 .voff = TCX_TEC,
278 .size = PAGE_SIZE
279 },
280 {
281 .voff = TCX_BTREGS,
282 .size = PAGE_SIZE
283 },
284 {
285 .voff = TCX_THC,
286 .size = PAGE_SIZE
287 },
288 {
289 .voff = TCX_DHC,
290 .size = PAGE_SIZE
291 },
292 {
293 .voff = TCX_ALT,
294 .size = PAGE_SIZE
295 },
296 {
297 .voff = TCX_UNK2,
298 .size = 0x20000
299 },
300 { .size = 0 }
301 };
302
303 static int tcx_mmap(struct fb_info *info, struct vm_area_struct *vma)
304 {
305 struct tcx_par *par = (struct tcx_par *)info->par;
306
307 return sbusfb_mmap_helper(par->mmap_map,
308 par->physbase, par->fbsize,
309 par->which_io, vma);
310 }
311
312 static int tcx_ioctl(struct fb_info *info, unsigned int cmd,
313 unsigned long arg)
314 {
315 struct tcx_par *par = (struct tcx_par *) info->par;
316
317 return sbusfb_ioctl_helper(cmd, arg, info,
318 FBTYPE_TCXCOLOR,
319 (par->lowdepth ? 8 : 24),
320 par->fbsize);
321 }
322
323 /*
324 * Initialisation
325 */
326
327 static void
328 tcx_init_fix(struct fb_info *info, int linebytes)
329 {
330 struct tcx_par *par = (struct tcx_par *)info->par;
331 const char *tcx_name;
332
333 if (par->lowdepth)
334 tcx_name = "TCX8";
335 else
336 tcx_name = "TCX24";
337
338 strlcpy(info->fix.id, tcx_name, sizeof(info->fix.id));
339
340 info->fix.type = FB_TYPE_PACKED_PIXELS;
341 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
342
343 info->fix.line_length = linebytes;
344
345 info->fix.accel = FB_ACCEL_SUN_TCX;
346 }
347
348 static void tcx_unmap_regs(struct of_device *op, struct fb_info *info,
349 struct tcx_par *par)
350 {
351 if (par->tec)
352 of_iounmap(&op->resource[7],
353 par->tec, sizeof(struct tcx_tec));
354 if (par->thc)
355 of_iounmap(&op->resource[9],
356 par->thc, sizeof(struct tcx_thc));
357 if (par->bt)
358 of_iounmap(&op->resource[8],
359 par->bt, sizeof(struct bt_regs));
360 if (par->cplane)
361 of_iounmap(&op->resource[4],
362 par->cplane, par->fbsize * sizeof(u32));
363 if (info->screen_base)
364 of_iounmap(&op->resource[0],
365 info->screen_base, par->fbsize);
366 }
367
368 static int __devinit tcx_init_one(struct of_device *op)
369 {
370 struct device_node *dp = op->node;
371 struct fb_info *info;
372 struct tcx_par *par;
373 int linebytes, i, err;
374
375 info = framebuffer_alloc(sizeof(struct tcx_par), &op->dev);
376
377 err = -ENOMEM;
378 if (!info)
379 goto out_err;
380 par = info->par;
381
382 spin_lock_init(&par->lock);
383
384 par->lowdepth =
385 (of_find_property(dp, "tcx-8-bit", NULL) != NULL);
386
387 sbusfb_fill_var(&info->var, dp->node, 8);
388 info->var.red.length = 8;
389 info->var.green.length = 8;
390 info->var.blue.length = 8;
391
392 linebytes = of_getintprop_default(dp, "linebytes",
393 info->var.xres);
394 par->fbsize = PAGE_ALIGN(linebytes * info->var.yres);
395
396 par->tec = of_ioremap(&op->resource[7], 0,
397 sizeof(struct tcx_tec), "tcx tec");
398 par->thc = of_ioremap(&op->resource[9], 0,
399 sizeof(struct tcx_thc), "tcx thc");
400 par->bt = of_ioremap(&op->resource[8], 0,
401 sizeof(struct bt_regs), "tcx dac");
402 info->screen_base = of_ioremap(&op->resource[0], 0,
403 par->fbsize, "tcx ram");
404 if (!par->tec || !par->thc ||
405 !par->bt || !info->screen_base)
406 goto out_unmap_regs;
407
408 memcpy(&par->mmap_map, &__tcx_mmap_map, sizeof(par->mmap_map));
409 if (!par->lowdepth) {
410 par->cplane = of_ioremap(&op->resource[4], 0,
411 par->fbsize * sizeof(u32),
412 "tcx cplane");
413 if (!par->cplane)
414 goto out_unmap_regs;
415 } else {
416 par->mmap_map[1].size = SBUS_MMAP_EMPTY;
417 par->mmap_map[4].size = SBUS_MMAP_EMPTY;
418 par->mmap_map[5].size = SBUS_MMAP_EMPTY;
419 par->mmap_map[6].size = SBUS_MMAP_EMPTY;
420 }
421
422 par->physbase = 0;
423 par->which_io = op->resource[0].flags & IORESOURCE_BITS;
424
425 for (i = 0; i < TCX_MMAP_ENTRIES; i++) {
426 int j;
427
428 switch (i) {
429 case 10:
430 j = 12;
431 break;
432
433 case 11: case 12:
434 j = i - 1;
435 break;
436
437 default:
438 j = i;
439 break;
440 };
441 par->mmap_map[i].poff = op->resource[j].start;
442 }
443
444 info->flags = FBINFO_DEFAULT;
445 info->fbops = &tcx_ops;
446
447 /* Initialize brooktree DAC. */
448 sbus_writel(0x04 << 24, &par->bt->addr); /* color planes */
449 sbus_writel(0xff << 24, &par->bt->control);
450 sbus_writel(0x05 << 24, &par->bt->addr);
451 sbus_writel(0x00 << 24, &par->bt->control);
452 sbus_writel(0x06 << 24, &par->bt->addr); /* overlay plane */
453 sbus_writel(0x73 << 24, &par->bt->control);
454 sbus_writel(0x07 << 24, &par->bt->addr);
455 sbus_writel(0x00 << 24, &par->bt->control);
456
457 tcx_reset(info);
458
459 tcx_blank(FB_BLANK_UNBLANK, info);
460
461 if (fb_alloc_cmap(&info->cmap, 256, 0))
462 goto out_unmap_regs;
463
464 fb_set_cmap(&info->cmap, info);
465 tcx_init_fix(info, linebytes);
466
467 err = register_framebuffer(info);
468 if (err < 0)
469 goto out_dealloc_cmap;
470
471 dev_set_drvdata(&op->dev, info);
472
473 printk("%s: TCX at %lx:%lx, %s\n",
474 dp->full_name,
475 par->which_io,
476 op->resource[0].start,
477 par->lowdepth ? "8-bit only" : "24-bit depth");
478
479 return 0;
480
481 out_dealloc_cmap:
482 fb_dealloc_cmap(&info->cmap);
483
484 out_unmap_regs:
485 tcx_unmap_regs(op, info, par);
486
487 out_err:
488 return err;
489 }
490
491 static int __devinit tcx_probe(struct of_device *dev, const struct of_device_id *match)
492 {
493 struct of_device *op = to_of_device(&dev->dev);
494
495 return tcx_init_one(op);
496 }
497
498 static int __devexit tcx_remove(struct of_device *op)
499 {
500 struct fb_info *info = dev_get_drvdata(&op->dev);
501 struct tcx_par *par = info->par;
502
503 unregister_framebuffer(info);
504 fb_dealloc_cmap(&info->cmap);
505
506 tcx_unmap_regs(op, info, par);
507
508 framebuffer_release(info);
509
510 dev_set_drvdata(&op->dev, NULL);
511
512 return 0;
513 }
514
515 static struct of_device_id tcx_match[] = {
516 {
517 .name = "SUNW,tcx",
518 },
519 {},
520 };
521 MODULE_DEVICE_TABLE(of, tcx_match);
522
523 static struct of_platform_driver tcx_driver = {
524 .name = "tcx",
525 .match_table = tcx_match,
526 .probe = tcx_probe,
527 .remove = __devexit_p(tcx_remove),
528 };
529
530 int __init tcx_init(void)
531 {
532 if (fb_get_options("tcxfb", NULL))
533 return -ENODEV;
534
535 return of_register_driver(&tcx_driver, &of_bus_type);
536 }
537
538 void __exit tcx_exit(void)
539 {
540 of_unregister_driver(&tcx_driver);
541 }
542
543 module_init(tcx_init);
544 module_exit(tcx_exit);
545
546 MODULE_DESCRIPTION("framebuffer driver for TCX chipsets");
547 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
548 MODULE_VERSION("2.0");
549 MODULE_LICENSE("GPL");
550
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