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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / drivers / video / cg3.c
bloba5c7fb331527c03038d7b42d73830de306fbab4f
1 /* cg3.c: CGTHREE 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) 1997 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/oplib.h>
23 #include <asm/prom.h>
24 #include <asm/of_device.h>
25 #include <asm/fbio.h>
26
27 #include "sbuslib.h"
28
29 /*
30 * Local functions.
31 */
32
33 static int cg3_setcolreg(unsigned, unsigned, unsigned, unsigned,
34 unsigned, struct fb_info *);
35 static int cg3_blank(int, struct fb_info *);
36
37 static int cg3_mmap(struct fb_info *, struct vm_area_struct *);
38 static int cg3_ioctl(struct fb_info *, unsigned int, unsigned long);
39
40 /*
41 * Frame buffer operations
42 */
43
44 static struct fb_ops cg3_ops = {
45 .owner = THIS_MODULE,
46 .fb_setcolreg = cg3_setcolreg,
47 .fb_blank = cg3_blank,
48 .fb_fillrect = cfb_fillrect,
49 .fb_copyarea = cfb_copyarea,
50 .fb_imageblit = cfb_imageblit,
51 .fb_mmap = cg3_mmap,
52 .fb_ioctl = cg3_ioctl,
53 #ifdef CONFIG_COMPAT
54 .fb_compat_ioctl = sbusfb_compat_ioctl,
55 #endif
56 };
57
58
59 /* Control Register Constants */
60 #define CG3_CR_ENABLE_INTS 0x80
61 #define CG3_CR_ENABLE_VIDEO 0x40
62 #define CG3_CR_ENABLE_TIMING 0x20
63 #define CG3_CR_ENABLE_CURCMP 0x10
64 #define CG3_CR_XTAL_MASK 0x0c
65 #define CG3_CR_DIVISOR_MASK 0x03
66
67 /* Status Register Constants */
68 #define CG3_SR_PENDING_INT 0x80
69 #define CG3_SR_RES_MASK 0x70
70 #define CG3_SR_1152_900_76_A 0x40
71 #define CG3_SR_1152_900_76_B 0x60
72 #define CG3_SR_ID_MASK 0x0f
73 #define CG3_SR_ID_COLOR 0x01
74 #define CG3_SR_ID_MONO 0x02
75 #define CG3_SR_ID_MONO_ECL 0x03
76
77 enum cg3_type {
78 CG3_AT_66HZ = 0,
79 CG3_AT_76HZ,
80 CG3_RDI
81 };
82
83 struct bt_regs {
84 u32 addr;
85 u32 color_map;
86 u32 control;
87 u32 cursor;
88 };
89
90 struct cg3_regs {
91 struct bt_regs cmap;
92 u8 control;
93 u8 status;
94 u8 cursor_start;
95 u8 cursor_end;
96 u8 h_blank_start;
97 u8 h_blank_end;
98 u8 h_sync_start;
99 u8 h_sync_end;
100 u8 comp_sync_end;
101 u8 v_blank_start_high;
102 u8 v_blank_start_low;
103 u8 v_blank_end;
104 u8 v_sync_start;
105 u8 v_sync_end;
106 u8 xfer_holdoff_start;
107 u8 xfer_holdoff_end;
108 };
109
110 /* Offset of interesting structures in the OBIO space */
111 #define CG3_REGS_OFFSET 0x400000UL
112 #define CG3_RAM_OFFSET 0x800000UL
113
114 struct cg3_par {
115 spinlock_t lock;
116 struct cg3_regs __iomem *regs;
117 u32 sw_cmap[((256 * 3) + 3) / 4];
118
119 u32 flags;
120 #define CG3_FLAG_BLANKED 0x00000001
121 #define CG3_FLAG_RDI 0x00000002
122
123 unsigned long physbase;
124 unsigned long which_io;
125 unsigned long fbsize;
126 };
127
128 /**
129 * cg3_setcolreg - Optional function. Sets a color register.
130 * @regno: boolean, 0 copy local, 1 get_user() function
131 * @red: frame buffer colormap structure
132 * @green: The green value which can be up to 16 bits wide
133 * @blue: The blue value which can be up to 16 bits wide.
134 * @transp: If supported the alpha value which can be up to 16 bits wide.
135 * @info: frame buffer info structure
136 *
137 * The cg3 palette is loaded with 4 color values at each time
138 * so you end up with: (rgb)(r), (gb)(rg), (b)(rgb), and so on.
139 * We keep a sw copy of the hw cmap to assist us in this esoteric
140 * loading procedure.
141 */
142 static int cg3_setcolreg(unsigned regno,
143 unsigned red, unsigned green, unsigned blue,
144 unsigned transp, struct fb_info *info)
145 {
146 struct cg3_par *par = (struct cg3_par *) info->par;
147 struct bt_regs __iomem *bt = &par->regs->cmap;
148 unsigned long flags;
149 u32 *p32;
150 u8 *p8;
151 int count;
152
153 if (regno >= 256)
154 return 1;
155
156 red >>= 8;
157 green >>= 8;
158 blue >>= 8;
159
160 spin_lock_irqsave(&par->lock, flags);
161
162 p8 = (u8 *)par->sw_cmap + (regno * 3);
163 p8[0] = red;
164 p8[1] = green;
165 p8[2] = blue;
166
167 #define D4M3(x) ((((x)>>2)<<1) + ((x)>>2)) /* (x/4)*3 */
168 #define D4M4(x) ((x)&~0x3) /* (x/4)*4 */
169
170 count = 3;
171 p32 = &par->sw_cmap[D4M3(regno)];
172 sbus_writel(D4M4(regno), &bt->addr);
173 while (count--)
174 sbus_writel(*p32++, &bt->color_map);
175
176 #undef D4M3
177 #undef D4M4
178
179 spin_unlock_irqrestore(&par->lock, flags);
180
181 return 0;
182 }
183
184 /**
185 * cg3_blank - Optional function. Blanks the display.
186 * @blank_mode: the blank mode we want.
187 * @info: frame buffer structure that represents a single frame buffer
188 */
189 static int cg3_blank(int blank, struct fb_info *info)
190 {
191 struct cg3_par *par = (struct cg3_par *) info->par;
192 struct cg3_regs __iomem *regs = par->regs;
193 unsigned long flags;
194 u8 val;
195
196 spin_lock_irqsave(&par->lock, flags);
197
198 switch (blank) {
199 case FB_BLANK_UNBLANK: /* Unblanking */
200 val = sbus_readb(&regs->control);
201 val |= CG3_CR_ENABLE_VIDEO;
202 sbus_writeb(val, &regs->control);
203 par->flags &= ~CG3_FLAG_BLANKED;
204 break;
205
206 case FB_BLANK_NORMAL: /* Normal blanking */
207 case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */
208 case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
209 case FB_BLANK_POWERDOWN: /* Poweroff */
210 val = sbus_readb(&regs->control);
211 val &= ~CG3_CR_ENABLE_VIDEO;
212 sbus_writeb(val, &regs->control);
213 par->flags |= CG3_FLAG_BLANKED;
214 break;
215 }
216
217 spin_unlock_irqrestore(&par->lock, flags);
218
219 return 0;
220 }
221
222 static struct sbus_mmap_map cg3_mmap_map[] = {
223 {
224 .voff = CG3_MMAP_OFFSET,
225 .poff = CG3_RAM_OFFSET,
226 .size = SBUS_MMAP_FBSIZE(1)
227 },
228 { .size = 0 }
229 };
230
231 static int cg3_mmap(struct fb_info *info, struct vm_area_struct *vma)
232 {
233 struct cg3_par *par = (struct cg3_par *)info->par;
234
235 return sbusfb_mmap_helper(cg3_mmap_map,
236 par->physbase, par->fbsize,
237 par->which_io,
238 vma);
239 }
240
241 static int cg3_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
242 {
243 struct cg3_par *par = (struct cg3_par *) info->par;
244
245 return sbusfb_ioctl_helper(cmd, arg, info,
246 FBTYPE_SUN3COLOR, 8, par->fbsize);
247 }
248
249 /*
250 * Initialisation
251 */
252
253 static void __devinit cg3_init_fix(struct fb_info *info, int linebytes,
254 struct device_node *dp)
255 {
256 strlcpy(info->fix.id, dp->name, sizeof(info->fix.id));
257
258 info->fix.type = FB_TYPE_PACKED_PIXELS;
259 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
260
261 info->fix.line_length = linebytes;
262
263 info->fix.accel = FB_ACCEL_SUN_CGTHREE;
264 }
265
266 static void __devinit cg3_rdi_maybe_fixup_var(struct fb_var_screeninfo *var,
267 struct device_node *dp)
268 {
269 const char *params;
270 char *p;
271 int ww, hh;
272
273 params = of_get_property(dp, "params", NULL);
274 if (params) {
275 ww = simple_strtoul(params, &p, 10);
276 if (ww && *p == 'x') {
277 hh = simple_strtoul(p + 1, &p, 10);
278 if (hh && *p == '-') {
279 if (var->xres != ww ||
280 var->yres != hh) {
281 var->xres = var->xres_virtual = ww;
282 var->yres = var->yres_virtual = hh;
283 }
284 }
285 }
286 }
287 }
288
289 static u8 cg3regvals_66hz[] __devinitdata = { /* 1152 x 900, 66 Hz */
290 0x14, 0xbb, 0x15, 0x2b, 0x16, 0x04, 0x17, 0x14,
291 0x18, 0xae, 0x19, 0x03, 0x1a, 0xa8, 0x1b, 0x24,
292 0x1c, 0x01, 0x1d, 0x05, 0x1e, 0xff, 0x1f, 0x01,
293 0x10, 0x20, 0
294 };
295
296 static u8 cg3regvals_76hz[] __devinitdata = { /* 1152 x 900, 76 Hz */
297 0x14, 0xb7, 0x15, 0x27, 0x16, 0x03, 0x17, 0x0f,
298 0x18, 0xae, 0x19, 0x03, 0x1a, 0xae, 0x1b, 0x2a,
299 0x1c, 0x01, 0x1d, 0x09, 0x1e, 0xff, 0x1f, 0x01,
300 0x10, 0x24, 0
301 };
302
303 static u8 cg3regvals_rdi[] __devinitdata = { /* 640 x 480, cgRDI */
304 0x14, 0x70, 0x15, 0x20, 0x16, 0x08, 0x17, 0x10,
305 0x18, 0x06, 0x19, 0x02, 0x1a, 0x31, 0x1b, 0x51,
306 0x1c, 0x06, 0x1d, 0x0c, 0x1e, 0xff, 0x1f, 0x01,
307 0x10, 0x22, 0
308 };
309
310 static u8 *cg3_regvals[] __devinitdata = {
311 cg3regvals_66hz, cg3regvals_76hz, cg3regvals_rdi
312 };
313
314 static u_char cg3_dacvals[] __devinitdata = {
315 4, 0xff, 5, 0x00, 6, 0x70, 7, 0x00, 0
316 };
317
318 static int __devinit cg3_do_default_mode(struct cg3_par *par)
319 {
320 enum cg3_type type;
321 u8 *p;
322
323 if (par->flags & CG3_FLAG_RDI)
324 type = CG3_RDI;
325 else {
326 u8 status = sbus_readb(&par->regs->status), mon;
327 if ((status & CG3_SR_ID_MASK) == CG3_SR_ID_COLOR) {
328 mon = status & CG3_SR_RES_MASK;
329 if (mon == CG3_SR_1152_900_76_A ||
330 mon == CG3_SR_1152_900_76_B)
331 type = CG3_AT_76HZ;
332 else
333 type = CG3_AT_66HZ;
334 } else {
335 printk(KERN_ERR "cgthree: can't handle SR %02x\n",
336 status);
337 return -EINVAL;
338 }
339 }
340
341 for (p = cg3_regvals[type]; *p; p += 2) {
342 u8 __iomem *regp = &((u8 __iomem *)par->regs)[p[0]];
343 sbus_writeb(p[1], regp);
344 }
345 for (p = cg3_dacvals; *p; p += 2) {
346 u8 __iomem *regp;
347
348 regp = (u8 __iomem *)&par->regs->cmap.addr;
349 sbus_writeb(p[0], regp);
350 regp = (u8 __iomem *)&par->regs->cmap.control;
351 sbus_writeb(p[1], regp);
352 }
353 return 0;
354 }
355
356 static int __devinit cg3_probe(struct of_device *op,
357 const struct of_device_id *match)
358 {
359 struct device_node *dp = op->node;
360 struct fb_info *info;
361 struct cg3_par *par;
362 int linebytes, err;
363
364 info = framebuffer_alloc(sizeof(struct cg3_par), &op->dev);
365
366 err = -ENOMEM;
367 if (!info)
368 goto out_err;
369 par = info->par;
370
371 spin_lock_init(&par->lock);
372
373 par->physbase = op->resource[0].start;
374 par->which_io = op->resource[0].flags & IORESOURCE_BITS;
375
376 sbusfb_fill_var(&info->var, dp->node, 8);
377 info->var.red.length = 8;
378 info->var.green.length = 8;
379 info->var.blue.length = 8;
380 if (!strcmp(dp->name, "cgRDI"))
381 par->flags |= CG3_FLAG_RDI;
382 if (par->flags & CG3_FLAG_RDI)
383 cg3_rdi_maybe_fixup_var(&info->var, dp);
384
385 linebytes = of_getintprop_default(dp, "linebytes",
386 info->var.xres);
387 par->fbsize = PAGE_ALIGN(linebytes * info->var.yres);
388
389 par->regs = of_ioremap(&op->resource[0], CG3_REGS_OFFSET,
390 sizeof(struct cg3_regs), "cg3 regs");
391 if (!par->regs)
392 goto out_release_fb;
393
394 info->flags = FBINFO_DEFAULT;
395 info->fbops = &cg3_ops;
396 info->screen_base = of_ioremap(&op->resource[0], CG3_RAM_OFFSET,
397 par->fbsize, "cg3 ram");
398 if (!info->screen_base)
399 goto out_unmap_regs;
400
401 cg3_blank(0, info);
402
403 if (!of_find_property(dp, "width", NULL)) {
404 err = cg3_do_default_mode(par);
405 if (err)
406 goto out_unmap_screen;
407 }
408
409 if (fb_alloc_cmap(&info->cmap, 256, 0))
410 goto out_unmap_screen;
411
412 fb_set_cmap(&info->cmap, info);
413
414 cg3_init_fix(info, linebytes, dp);
415
416 err = register_framebuffer(info);
417 if (err < 0)
418 goto out_dealloc_cmap;
419
420 dev_set_drvdata(&op->dev, info);
421
422 printk("%s: cg3 at %lx:%lx\n",
423 dp->full_name, par->which_io, par->physbase);
424
425 return 0;
426
427 out_dealloc_cmap:
428 fb_dealloc_cmap(&info->cmap);
429
430 out_unmap_screen:
431 of_iounmap(&op->resource[0], info->screen_base, par->fbsize);
432
433 out_unmap_regs:
434 of_iounmap(&op->resource[0], par->regs, sizeof(struct cg3_regs));
435
436 out_release_fb:
437 framebuffer_release(info);
438
439 out_err:
440 return err;
441 }
442
443 static int __devexit cg3_remove(struct of_device *op)
444 {
445 struct fb_info *info = dev_get_drvdata(&op->dev);
446 struct cg3_par *par = info->par;
447
448 unregister_framebuffer(info);
449 fb_dealloc_cmap(&info->cmap);
450
451 of_iounmap(&op->resource[0], par->regs, sizeof(struct cg3_regs));
452 of_iounmap(&op->resource[0], info->screen_base, par->fbsize);
453
454 framebuffer_release(info);
455
456 dev_set_drvdata(&op->dev, NULL);
457
458 return 0;
459 }
460
461 static struct of_device_id cg3_match[] = {
462 {
463 .name = "cgthree",
464 },
465 {
466 .name = "cgRDI",
467 },
468 {},
469 };
470 MODULE_DEVICE_TABLE(of, cg3_match);
471
472 static struct of_platform_driver cg3_driver = {
473 .name = "cg3",
474 .match_table = cg3_match,
475 .probe = cg3_probe,
476 .remove = __devexit_p(cg3_remove),
477 };
478
479 static int __init cg3_init(void)
480 {
481 if (fb_get_options("cg3fb", NULL))
482 return -ENODEV;
483
484 return of_register_driver(&cg3_driver, &of_bus_type);
485 }
486
487 static void __exit cg3_exit(void)
488 {
489 of_unregister_driver(&cg3_driver);
490 }
491
492 module_init(cg3_init);
493 module_exit(cg3_exit);
494
495 MODULE_DESCRIPTION("framebuffer driver for CGthree chipsets");
496 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
497 MODULE_VERSION("2.0");
498 MODULE_LICENSE("GPL");
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