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