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 #include <linux/of_device.h>
21
22 #include <asm/io.h>
23 #include <asm/fbio.h>
24
25 #include "sbuslib.h"
26
27 /*
28 * Local functions.
29 */
30
31 static int tcx_setcolreg(unsigned, unsigned, unsigned, unsigned,
32 unsigned, struct fb_info *);
33 static int tcx_blank(int, struct fb_info *);
34
35 static int tcx_mmap(struct fb_info *, struct vm_area_struct *);
36 static int tcx_ioctl(struct fb_info *, unsigned int, unsigned long);
37 static int tcx_pan_display(struct fb_var_screeninfo *, struct fb_info *);
38
39 /*
40 * Frame buffer operations
41 */
42
43 static struct fb_ops tcx_ops = {
44 .owner = THIS_MODULE,
45 .fb_setcolreg = tcx_setcolreg,
46 .fb_blank = tcx_blank,
47 .fb_pan_display = tcx_pan_display,
48 .fb_fillrect = cfb_fillrect,
49 .fb_copyarea = cfb_copyarea,
50 .fb_imageblit = cfb_imageblit,
51 .fb_mmap = tcx_mmap,
52 .fb_ioctl = tcx_ioctl,
53 #ifdef CONFIG_COMPAT
54 .fb_compat_ioctl = sbusfb_compat_ioctl,
55 #endif
56 };
57
58 /* THC definitions */
59 #define TCX_THC_MISC_REV_SHIFT 16
60 #define TCX_THC_MISC_REV_MASK 15
61 #define TCX_THC_MISC_VSYNC_DIS (1 << 25)
62 #define TCX_THC_MISC_HSYNC_DIS (1 << 24)
63 #define TCX_THC_MISC_RESET (1 << 12)
64 #define TCX_THC_MISC_VIDEO (1 << 10)
65 #define TCX_THC_MISC_SYNC (1 << 9)
66 #define TCX_THC_MISC_VSYNC (1 << 8)
67 #define TCX_THC_MISC_SYNC_ENAB (1 << 7)
68 #define TCX_THC_MISC_CURS_RES (1 << 6)
69 #define TCX_THC_MISC_INT_ENAB (1 << 5)
70 #define TCX_THC_MISC_INT (1 << 4)
71 #define TCX_THC_MISC_INIT 0x9f
72 #define TCX_THC_REV_REV_SHIFT 20
73 #define TCX_THC_REV_REV_MASK 15
74 #define TCX_THC_REV_MINREV_SHIFT 28
75 #define TCX_THC_REV_MINREV_MASK 15
76
77 /* The contents are unknown */
78 struct tcx_tec {
79 u32 tec_matrix;
80 u32 tec_clip;
81 u32 tec_vdc;
82 };
83
84 struct tcx_thc {
85 u32 thc_rev;
86 u32 thc_pad0[511];
87 u32 thc_hs; /* hsync timing */
88 u32 thc_hsdvs;
89 u32 thc_hd;
90 u32 thc_vs; /* vsync timing */
91 u32 thc_vd;
92 u32 thc_refresh;
93 u32 thc_misc;
94 u32 thc_pad1[56];
95 u32 thc_cursxy; /* cursor x,y position (16 bits each) */
96 u32 thc_cursmask[32]; /* cursor mask bits */
97 u32 thc_cursbits[32]; /* what to show where mask enabled */
98 };
99
100 struct bt_regs {
101 u32 addr;
102 u32 color_map;
103 u32 control;
104 u32 cursor;
105 };
106
107 #define TCX_MMAP_ENTRIES 14
108
109 struct tcx_par {
110 spinlock_t lock;
111 struct bt_regs __iomem *bt;
112 struct tcx_thc __iomem *thc;
113 struct tcx_tec __iomem *tec;
114 u32 __iomem *cplane;
115
116 u32 flags;
117 #define TCX_FLAG_BLANKED 0x00000001
118
119 unsigned long physbase;
120 unsigned long which_io;
121 unsigned long fbsize;
122
123 struct sbus_mmap_map mmap_map[TCX_MMAP_ENTRIES];
124 int lowdepth;
125 };
126
127 /* Reset control plane so that WID is 8-bit plane. */
__tcx_set_control_plane(struct tcx_par * par)128 static void __tcx_set_control_plane(struct tcx_par *par)
129 {
130 u32 __iomem *p, *pend;
131
132 if (par->lowdepth)
133 return;
134
135 p = par->cplane;
136 if (p == NULL)
137 return;
138 for (pend = p + par->fbsize; p < pend; p++) {
139 u32 tmp = sbus_readl(p);
140
141 tmp &= 0xffffff;
142 sbus_writel(tmp, p);
143 }
144 }
145
tcx_reset(struct fb_info * info)146 static void tcx_reset(struct fb_info *info)
147 {
148 struct tcx_par *par = (struct tcx_par *) info->par;
149 unsigned long flags;
150
151 spin_lock_irqsave(&par->lock, flags);
152 __tcx_set_control_plane(par);
153 spin_unlock_irqrestore(&par->lock, flags);
154 }
155
tcx_pan_display(struct fb_var_screeninfo * var,struct fb_info * info)156 static int tcx_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
157 {
158 tcx_reset(info);
159 return 0;
160 }
161
162 /**
163 * tcx_setcolreg - Optional function. Sets a color register.
164 * @regno: boolean, 0 copy local, 1 get_user() function
165 * @red: frame buffer colormap structure
166 * @green: The green value which can be up to 16 bits wide
167 * @blue: The blue value which can be up to 16 bits wide.
168 * @transp: If supported the alpha value which can be up to 16 bits wide.
169 * @info: frame buffer info structure
170 */
tcx_setcolreg(unsigned regno,unsigned red,unsigned green,unsigned blue,unsigned transp,struct fb_info * info)171 static int tcx_setcolreg(unsigned regno,
172 unsigned red, unsigned green, unsigned blue,
173 unsigned transp, struct fb_info *info)
174 {
175 struct tcx_par *par = (struct tcx_par *) info->par;
176 struct bt_regs __iomem *bt = par->bt;
177 unsigned long flags;
178
179 if (regno >= 256)
180 return 1;
181
182 red >>= 8;
183 green >>= 8;
184 blue >>= 8;
185
186 spin_lock_irqsave(&par->lock, flags);
187
188 sbus_writel(regno << 24, &bt->addr);
189 sbus_writel(red << 24, &bt->color_map);
190 sbus_writel(green << 24, &bt->color_map);
191 sbus_writel(blue << 24, &bt->color_map);
192
193 spin_unlock_irqrestore(&par->lock, flags);
194
195 return 0;
196 }
197
198 /**
199 * tcx_blank - Optional function. Blanks the display.
200 * @blank_mode: the blank mode we want.
201 * @info: frame buffer structure that represents a single frame buffer
202 */
203 static int
tcx_blank(int blank,struct fb_info * info)204 tcx_blank(int blank, struct fb_info *info)
205 {
206 struct tcx_par *par = (struct tcx_par *) info->par;
207 struct tcx_thc __iomem *thc = par->thc;
208 unsigned long flags;
209 u32 val;
210
211 spin_lock_irqsave(&par->lock, flags);
212
213 val = sbus_readl(&thc->thc_misc);
214
215 switch (blank) {
216 case FB_BLANK_UNBLANK: /* Unblanking */
217 val &= ~(TCX_THC_MISC_VSYNC_DIS |
218 TCX_THC_MISC_HSYNC_DIS);
219 val |= TCX_THC_MISC_VIDEO;
220 par->flags &= ~TCX_FLAG_BLANKED;
221 break;
222
223 case FB_BLANK_NORMAL: /* Normal blanking */
224 val &= ~TCX_THC_MISC_VIDEO;
225 par->flags |= TCX_FLAG_BLANKED;
226 break;
227
228 case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */
229 val |= TCX_THC_MISC_VSYNC_DIS;
230 break;
231 case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
232 val |= TCX_THC_MISC_HSYNC_DIS;
233 break;
234
235 case FB_BLANK_POWERDOWN: /* Poweroff */
236 break;
237 };
238
239 sbus_writel(val, &thc->thc_misc);
240
241 spin_unlock_irqrestore(&par->lock, flags);
242
243 return 0;
244 }
245
246 static struct sbus_mmap_map __tcx_mmap_map[TCX_MMAP_ENTRIES] = {
247 {
248 .voff = TCX_RAM8BIT,
249 .size = SBUS_MMAP_FBSIZE(1)
250 },
251 {
252 .voff = TCX_RAM24BIT,
253 .size = SBUS_MMAP_FBSIZE(4)
254 },
255 {
256 .voff = TCX_UNK3,
257 .size = SBUS_MMAP_FBSIZE(8)
258 },
259 {
260 .voff = TCX_UNK4,
261 .size = SBUS_MMAP_FBSIZE(8)
262 },
263 {
264 .voff = TCX_CONTROLPLANE,
265 .size = SBUS_MMAP_FBSIZE(4)
266 },
267 {
268 .voff = TCX_UNK6,
269 .size = SBUS_MMAP_FBSIZE(8)
270 },
271 {
272 .voff = TCX_UNK7,
273 .size = SBUS_MMAP_FBSIZE(8)
274 },
275 {
276 .voff = TCX_TEC,
277 .size = PAGE_SIZE
278 },
279 {
280 .voff = TCX_BTREGS,
281 .size = PAGE_SIZE
282 },
283 {
284 .voff = TCX_THC,
285 .size = PAGE_SIZE
286 },
287 {
288 .voff = TCX_DHC,
289 .size = PAGE_SIZE
290 },
291 {
292 .voff = TCX_ALT,
293 .size = PAGE_SIZE
294 },
295 {
296 .voff = TCX_UNK2,
297 .size = 0x20000
298 },
299 { .size = 0 }
300 };
301
tcx_mmap(struct fb_info * info,struct vm_area_struct * vma)302 static int tcx_mmap(struct fb_info *info, struct vm_area_struct *vma)
303 {
304 struct tcx_par *par = (struct tcx_par *)info->par;
305
306 return sbusfb_mmap_helper(par->mmap_map,
307 par->physbase, par->fbsize,
308 par->which_io, vma);
309 }
310
tcx_ioctl(struct fb_info * info,unsigned int cmd,unsigned long arg)311 static int tcx_ioctl(struct fb_info *info, unsigned int cmd,
312 unsigned long arg)
313 {
314 struct tcx_par *par = (struct tcx_par *) info->par;
315
316 return sbusfb_ioctl_helper(cmd, arg, info,
317 FBTYPE_TCXCOLOR,
318 (par->lowdepth ? 8 : 24),
319 par->fbsize);
320 }
321
322 /*
323 * Initialisation
324 */
325
326 static void
tcx_init_fix(struct fb_info * info,int linebytes)327 tcx_init_fix(struct fb_info *info, int linebytes)
328 {
329 struct tcx_par *par = (struct tcx_par *)info->par;
330 const char *tcx_name;
331
332 if (par->lowdepth)
333 tcx_name = "TCX8";
334 else
335 tcx_name = "TCX24";
336
337 strlcpy(info->fix.id, tcx_name, sizeof(info->fix.id));
338
339 info->fix.type = FB_TYPE_PACKED_PIXELS;
340 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
341
342 info->fix.line_length = linebytes;
343
344 info->fix.accel = FB_ACCEL_SUN_TCX;
345 }
346
tcx_unmap_regs(struct of_device * op,struct fb_info * info,struct tcx_par * par)347 static void tcx_unmap_regs(struct of_device *op, struct fb_info *info,
348 struct tcx_par *par)
349 {
350 if (par->tec)
351 of_iounmap(&op->resource[7],
352 par->tec, sizeof(struct tcx_tec));
353 if (par->thc)
354 of_iounmap(&op->resource[9],
355 par->thc, sizeof(struct tcx_thc));
356 if (par->bt)
357 of_iounmap(&op->resource[8],
358 par->bt, sizeof(struct bt_regs));
359 if (par->cplane)
360 of_iounmap(&op->resource[4],
361 par->cplane, par->fbsize * sizeof(u32));
362 if (info->screen_base)
363 of_iounmap(&op->resource[0],
364 info->screen_base, par->fbsize);
365 }
366
tcx_probe(struct of_device * op,const struct of_device_id * match)367 static int __devinit tcx_probe(struct of_device *op,
368 const struct of_device_id *match)
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, 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 = op->resource[0].start;
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(KERN_INFO "%s: TCX at %lx:%lx, %s\n",
474 dp->full_name,
475 par->which_io,
476 par->physbase,
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
tcx_remove(struct of_device * op)491 static int __devexit tcx_remove(struct of_device *op)
492 {
493 struct fb_info *info = dev_get_drvdata(&op->dev);
494 struct tcx_par *par = info->par;
495
496 unregister_framebuffer(info);
497 fb_dealloc_cmap(&info->cmap);
498
499 tcx_unmap_regs(op, info, par);
500
501 framebuffer_release(info);
502
503 dev_set_drvdata(&op->dev, NULL);
504
505 return 0;
506 }
507
508 static const struct of_device_id tcx_match[] = {
509 {
510 .name = "SUNW,tcx",
511 },
512 {},
513 };
514 MODULE_DEVICE_TABLE(of, tcx_match);
515
516 static struct of_platform_driver tcx_driver = {
517 .name = "tcx",
518 .match_table = tcx_match,
519 .probe = tcx_probe,
520 .remove = __devexit_p(tcx_remove),
521 };
522
tcx_init(void)523 static int __init tcx_init(void)
524 {
525 if (fb_get_options("tcxfb", NULL))
526 return -ENODEV;
527
528 return of_register_driver(&tcx_driver, &of_bus_type);
529 }
530
tcx_exit(void)531 static void __exit tcx_exit(void)
532 {
533 of_unregister_driver(&tcx_driver);
534 }
535
536 module_init(tcx_init);
537 module_exit(tcx_exit);
538
539 MODULE_DESCRIPTION("framebuffer driver for TCX chipsets");
540 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
541 MODULE_VERSION("2.0");
542 MODULE_LICENSE("GPL");
543