1 // SPDX-License-Identifier: GPL-2.0-only
2 /* tcx.c: TCX frame buffer driver
3 *
4 * Copyright (C) 2003, 2006 David S. Miller (davem@davemloft.net)
5 * Copyright (C) 1996,1998 Jakub Jelinek (jj@ultra.linux.cz)
6 * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
7 * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
8 *
9 * Driver layout based loosely on tgafb.c, see that file for credits.
10 */
11
12 #include <linux/module.h>
13 #include <linux/kernel.h>
14 #include <linux/errno.h>
15 #include <linux/string.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 which_io;
120
121 struct sbus_mmap_map mmap_map[TCX_MMAP_ENTRIES];
122 int lowdepth;
123 };
124
125 /* Reset control plane so that WID is 8-bit plane. */
__tcx_set_control_plane(struct fb_info * info)126 static void __tcx_set_control_plane(struct fb_info *info)
127 {
128 struct tcx_par *par = info->par;
129 u32 __iomem *p, *pend;
130
131 if (par->lowdepth)
132 return;
133
134 p = par->cplane;
135 if (p == NULL)
136 return;
137 for (pend = p + info->fix.smem_len; p < pend; p++) {
138 u32 tmp = sbus_readl(p);
139
140 tmp &= 0xffffff;
141 sbus_writel(tmp, p);
142 }
143 }
144
tcx_reset(struct fb_info * info)145 static void tcx_reset(struct fb_info *info)
146 {
147 struct tcx_par *par = (struct tcx_par *) info->par;
148 unsigned long flags;
149
150 spin_lock_irqsave(&par->lock, flags);
151 __tcx_set_control_plane(info);
152 spin_unlock_irqrestore(&par->lock, flags);
153 }
154
tcx_pan_display(struct fb_var_screeninfo * var,struct fb_info * info)155 static int tcx_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
156 {
157 tcx_reset(info);
158 return 0;
159 }
160
161 /**
162 * tcx_setcolreg - Optional function. Sets a color register.
163 * @regno: boolean, 0 copy local, 1 get_user() function
164 * @red: frame buffer colormap structure
165 * @green: The green value which can be up to 16 bits wide
166 * @blue: The blue value which can be up to 16 bits wide.
167 * @transp: If supported the alpha value which can be up to 16 bits wide.
168 * @info: frame buffer info structure
169 */
tcx_setcolreg(unsigned regno,unsigned red,unsigned green,unsigned blue,unsigned transp,struct fb_info * info)170 static int tcx_setcolreg(unsigned regno,
171 unsigned red, unsigned green, unsigned blue,
172 unsigned transp, struct fb_info *info)
173 {
174 struct tcx_par *par = (struct tcx_par *) info->par;
175 struct bt_regs __iomem *bt = par->bt;
176 unsigned long flags;
177
178 if (regno >= 256)
179 return 1;
180
181 red >>= 8;
182 green >>= 8;
183 blue >>= 8;
184
185 spin_lock_irqsave(&par->lock, flags);
186
187 sbus_writel(regno << 24, &bt->addr);
188 sbus_writel(red << 24, &bt->color_map);
189 sbus_writel(green << 24, &bt->color_map);
190 sbus_writel(blue << 24, &bt->color_map);
191
192 spin_unlock_irqrestore(&par->lock, flags);
193
194 return 0;
195 }
196
197 /**
198 * tcx_blank - Optional function. Blanks the display.
199 * @blank_mode: the blank mode we want.
200 * @info: frame buffer structure that represents a single frame buffer
201 */
202 static int
tcx_blank(int blank,struct fb_info * info)203 tcx_blank(int blank, struct fb_info *info)
204 {
205 struct tcx_par *par = (struct tcx_par *) info->par;
206 struct tcx_thc __iomem *thc = par->thc;
207 unsigned long flags;
208 u32 val;
209
210 spin_lock_irqsave(&par->lock, flags);
211
212 val = sbus_readl(&thc->thc_misc);
213
214 switch (blank) {
215 case FB_BLANK_UNBLANK: /* Unblanking */
216 val &= ~(TCX_THC_MISC_VSYNC_DIS |
217 TCX_THC_MISC_HSYNC_DIS);
218 val |= TCX_THC_MISC_VIDEO;
219 par->flags &= ~TCX_FLAG_BLANKED;
220 break;
221
222 case FB_BLANK_NORMAL: /* Normal blanking */
223 val &= ~TCX_THC_MISC_VIDEO;
224 par->flags |= TCX_FLAG_BLANKED;
225 break;
226
227 case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */
228 val |= TCX_THC_MISC_VSYNC_DIS;
229 break;
230 case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
231 val |= TCX_THC_MISC_HSYNC_DIS;
232 break;
233
234 case FB_BLANK_POWERDOWN: /* Poweroff */
235 break;
236 }
237
238 sbus_writel(val, &thc->thc_misc);
239
240 spin_unlock_irqrestore(&par->lock, flags);
241
242 return 0;
243 }
244
245 static struct sbus_mmap_map __tcx_mmap_map[TCX_MMAP_ENTRIES] = {
246 {
247 .voff = TCX_RAM8BIT,
248 .size = SBUS_MMAP_FBSIZE(1)
249 },
250 {
251 .voff = TCX_RAM24BIT,
252 .size = SBUS_MMAP_FBSIZE(4)
253 },
254 {
255 .voff = TCX_UNK3,
256 .size = SBUS_MMAP_FBSIZE(8)
257 },
258 {
259 .voff = TCX_UNK4,
260 .size = SBUS_MMAP_FBSIZE(8)
261 },
262 {
263 .voff = TCX_CONTROLPLANE,
264 .size = SBUS_MMAP_FBSIZE(4)
265 },
266 {
267 .voff = TCX_UNK6,
268 .size = SBUS_MMAP_FBSIZE(8)
269 },
270 {
271 .voff = TCX_UNK7,
272 .size = SBUS_MMAP_FBSIZE(8)
273 },
274 {
275 .voff = TCX_TEC,
276 .size = PAGE_SIZE
277 },
278 {
279 .voff = TCX_BTREGS,
280 .size = PAGE_SIZE
281 },
282 {
283 .voff = TCX_THC,
284 .size = PAGE_SIZE
285 },
286 {
287 .voff = TCX_DHC,
288 .size = PAGE_SIZE
289 },
290 {
291 .voff = TCX_ALT,
292 .size = PAGE_SIZE
293 },
294 {
295 .voff = TCX_UNK2,
296 .size = 0x20000
297 },
298 { .size = 0 }
299 };
300
tcx_mmap(struct fb_info * info,struct vm_area_struct * vma)301 static int tcx_mmap(struct fb_info *info, struct vm_area_struct *vma)
302 {
303 struct tcx_par *par = (struct tcx_par *)info->par;
304
305 return sbusfb_mmap_helper(par->mmap_map,
306 info->fix.smem_start, info->fix.smem_len,
307 par->which_io, vma);
308 }
309
tcx_ioctl(struct fb_info * info,unsigned int cmd,unsigned long arg)310 static int tcx_ioctl(struct fb_info *info, unsigned int cmd,
311 unsigned long arg)
312 {
313 struct tcx_par *par = (struct tcx_par *) info->par;
314
315 return sbusfb_ioctl_helper(cmd, arg, info,
316 FBTYPE_TCXCOLOR,
317 (par->lowdepth ? 8 : 24),
318 info->fix.smem_len);
319 }
320
321 /*
322 * Initialisation
323 */
324
325 static void
tcx_init_fix(struct fb_info * info,int linebytes)326 tcx_init_fix(struct fb_info *info, int linebytes)
327 {
328 struct tcx_par *par = (struct tcx_par *)info->par;
329 const char *tcx_name;
330
331 if (par->lowdepth)
332 tcx_name = "TCX8";
333 else
334 tcx_name = "TCX24";
335
336 strlcpy(info->fix.id, tcx_name, sizeof(info->fix.id));
337
338 info->fix.type = FB_TYPE_PACKED_PIXELS;
339 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
340
341 info->fix.line_length = linebytes;
342
343 info->fix.accel = FB_ACCEL_SUN_TCX;
344 }
345
tcx_unmap_regs(struct platform_device * op,struct fb_info * info,struct tcx_par * par)346 static void tcx_unmap_regs(struct platform_device *op, struct fb_info *info,
347 struct tcx_par *par)
348 {
349 if (par->tec)
350 of_iounmap(&op->resource[7],
351 par->tec, sizeof(struct tcx_tec));
352 if (par->thc)
353 of_iounmap(&op->resource[9],
354 par->thc, sizeof(struct tcx_thc));
355 if (par->bt)
356 of_iounmap(&op->resource[8],
357 par->bt, sizeof(struct bt_regs));
358 if (par->cplane)
359 of_iounmap(&op->resource[4],
360 par->cplane, info->fix.smem_len * sizeof(u32));
361 if (info->screen_base)
362 of_iounmap(&op->resource[0],
363 info->screen_base, info->fix.smem_len);
364 }
365
tcx_probe(struct platform_device * op)366 static int tcx_probe(struct platform_device *op)
367 {
368 struct device_node *dp = op->dev.of_node;
369 struct fb_info *info;
370 struct tcx_par *par;
371 int linebytes, i, err;
372
373 info = framebuffer_alloc(sizeof(struct tcx_par), &op->dev);
374
375 err = -ENOMEM;
376 if (!info)
377 goto out_err;
378 par = info->par;
379
380 spin_lock_init(&par->lock);
381
382 par->lowdepth =
383 (of_find_property(dp, "tcx-8-bit", NULL) != NULL);
384
385 sbusfb_fill_var(&info->var, dp, 8);
386 info->var.red.length = 8;
387 info->var.green.length = 8;
388 info->var.blue.length = 8;
389
390 linebytes = of_getintprop_default(dp, "linebytes",
391 info->var.xres);
392 info->fix.smem_len = PAGE_ALIGN(linebytes * info->var.yres);
393
394 par->tec = of_ioremap(&op->resource[7], 0,
395 sizeof(struct tcx_tec), "tcx tec");
396 par->thc = of_ioremap(&op->resource[9], 0,
397 sizeof(struct tcx_thc), "tcx thc");
398 par->bt = of_ioremap(&op->resource[8], 0,
399 sizeof(struct bt_regs), "tcx dac");
400 info->screen_base = of_ioremap(&op->resource[0], 0,
401 info->fix.smem_len, "tcx ram");
402 if (!par->tec || !par->thc ||
403 !par->bt || !info->screen_base)
404 goto out_unmap_regs;
405
406 memcpy(&par->mmap_map, &__tcx_mmap_map, sizeof(par->mmap_map));
407 if (!par->lowdepth) {
408 par->cplane = of_ioremap(&op->resource[4], 0,
409 info->fix.smem_len * sizeof(u32),
410 "tcx cplane");
411 if (!par->cplane)
412 goto out_unmap_regs;
413 } else {
414 par->mmap_map[1].size = SBUS_MMAP_EMPTY;
415 par->mmap_map[4].size = SBUS_MMAP_EMPTY;
416 par->mmap_map[5].size = SBUS_MMAP_EMPTY;
417 par->mmap_map[6].size = SBUS_MMAP_EMPTY;
418 }
419
420 info->fix.smem_start = op->resource[0].start;
421 par->which_io = op->resource[0].flags & IORESOURCE_BITS;
422
423 for (i = 0; i < TCX_MMAP_ENTRIES; i++) {
424 int j;
425
426 switch (i) {
427 case 10:
428 j = 12;
429 break;
430
431 case 11: case 12:
432 j = i - 1;
433 break;
434
435 default:
436 j = i;
437 break;
438 }
439 par->mmap_map[i].poff = op->resource[j].start;
440 }
441
442 info->flags = FBINFO_DEFAULT;
443 info->fbops = &tcx_ops;
444
445 /* Initialize brooktree DAC. */
446 sbus_writel(0x04 << 24, &par->bt->addr); /* color planes */
447 sbus_writel(0xff << 24, &par->bt->control);
448 sbus_writel(0x05 << 24, &par->bt->addr);
449 sbus_writel(0x00 << 24, &par->bt->control);
450 sbus_writel(0x06 << 24, &par->bt->addr); /* overlay plane */
451 sbus_writel(0x73 << 24, &par->bt->control);
452 sbus_writel(0x07 << 24, &par->bt->addr);
453 sbus_writel(0x00 << 24, &par->bt->control);
454
455 tcx_reset(info);
456
457 tcx_blank(FB_BLANK_UNBLANK, info);
458
459 if (fb_alloc_cmap(&info->cmap, 256, 0))
460 goto out_unmap_regs;
461
462 fb_set_cmap(&info->cmap, info);
463 tcx_init_fix(info, linebytes);
464
465 err = register_framebuffer(info);
466 if (err < 0)
467 goto out_dealloc_cmap;
468
469 dev_set_drvdata(&op->dev, info);
470
471 printk(KERN_INFO "%pOF: TCX at %lx:%lx, %s\n",
472 dp,
473 par->which_io,
474 info->fix.smem_start,
475 par->lowdepth ? "8-bit only" : "24-bit depth");
476
477 return 0;
478
479 out_dealloc_cmap:
480 fb_dealloc_cmap(&info->cmap);
481
482 out_unmap_regs:
483 tcx_unmap_regs(op, info, par);
484 framebuffer_release(info);
485
486 out_err:
487 return err;
488 }
489
tcx_remove(struct platform_device * op)490 static int tcx_remove(struct platform_device *op)
491 {
492 struct fb_info *info = dev_get_drvdata(&op->dev);
493 struct tcx_par *par = info->par;
494
495 unregister_framebuffer(info);
496 fb_dealloc_cmap(&info->cmap);
497
498 tcx_unmap_regs(op, info, par);
499
500 framebuffer_release(info);
501
502 return 0;
503 }
504
505 static const struct of_device_id tcx_match[] = {
506 {
507 .name = "SUNW,tcx",
508 },
509 {},
510 };
511 MODULE_DEVICE_TABLE(of, tcx_match);
512
513 static struct platform_driver tcx_driver = {
514 .driver = {
515 .name = "tcx",
516 .of_match_table = tcx_match,
517 },
518 .probe = tcx_probe,
519 .remove = tcx_remove,
520 };
521
tcx_init(void)522 static int __init tcx_init(void)
523 {
524 if (fb_get_options("tcxfb", NULL))
525 return -ENODEV;
526
527 return platform_driver_register(&tcx_driver);
528 }
529
tcx_exit(void)530 static void __exit tcx_exit(void)
531 {
532 platform_driver_unregister(&tcx_driver);
533 }
534
535 module_init(tcx_init);
536 module_exit(tcx_exit);
537
538 MODULE_DESCRIPTION("framebuffer driver for TCX chipsets");
539 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
540 MODULE_VERSION("2.0");
541 MODULE_LICENSE("GPL");
542
