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1da177e4 LT |
1 | /* cg3.c: CGTHREE frame buffer driver |
2 | * | |
3 | * Copyright (C) 2003 David S. Miller (davem@redhat.com) | |
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/sbus.h> | |
23 | #include <asm/oplib.h> | |
24 | #include <asm/fbio.h> | |
25 | ||
26 | #include "sbuslib.h" | |
27 | ||
28 | /* | |
29 | * Local functions. | |
30 | */ | |
31 | ||
32 | static int cg3_setcolreg(unsigned, unsigned, unsigned, unsigned, | |
33 | unsigned, struct fb_info *); | |
34 | static int cg3_blank(int, struct fb_info *); | |
35 | ||
36 | static int cg3_mmap(struct fb_info *, struct file *, struct vm_area_struct *); | |
37 | static int cg3_ioctl(struct inode *, struct file *, unsigned int, | |
38 | unsigned long, struct fb_info *); | |
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 | .fb_cursor = soft_cursor, | |
54 | }; | |
55 | ||
56 | ||
57 | /* Control Register Constants */ | |
58 | #define CG3_CR_ENABLE_INTS 0x80 | |
59 | #define CG3_CR_ENABLE_VIDEO 0x40 | |
60 | #define CG3_CR_ENABLE_TIMING 0x20 | |
61 | #define CG3_CR_ENABLE_CURCMP 0x10 | |
62 | #define CG3_CR_XTAL_MASK 0x0c | |
63 | #define CG3_CR_DIVISOR_MASK 0x03 | |
64 | ||
65 | /* Status Register Constants */ | |
66 | #define CG3_SR_PENDING_INT 0x80 | |
67 | #define CG3_SR_RES_MASK 0x70 | |
68 | #define CG3_SR_1152_900_76_A 0x40 | |
69 | #define CG3_SR_1152_900_76_B 0x60 | |
70 | #define CG3_SR_ID_MASK 0x0f | |
71 | #define CG3_SR_ID_COLOR 0x01 | |
72 | #define CG3_SR_ID_MONO 0x02 | |
73 | #define CG3_SR_ID_MONO_ECL 0x03 | |
74 | ||
75 | enum cg3_type { | |
76 | CG3_AT_66HZ = 0, | |
77 | CG3_AT_76HZ, | |
78 | CG3_RDI | |
79 | }; | |
80 | ||
81 | struct bt_regs { | |
82 | volatile u32 addr; | |
83 | volatile u32 color_map; | |
84 | volatile u32 control; | |
85 | volatile u32 cursor; | |
86 | }; | |
87 | ||
88 | struct cg3_regs { | |
89 | struct bt_regs cmap; | |
90 | volatile u8 control; | |
91 | volatile u8 status; | |
92 | volatile u8 cursor_start; | |
93 | volatile u8 cursor_end; | |
94 | volatile u8 h_blank_start; | |
95 | volatile u8 h_blank_end; | |
96 | volatile u8 h_sync_start; | |
97 | volatile u8 h_sync_end; | |
98 | volatile u8 comp_sync_end; | |
99 | volatile u8 v_blank_start_high; | |
100 | volatile u8 v_blank_start_low; | |
101 | volatile u8 v_blank_end; | |
102 | volatile u8 v_sync_start; | |
103 | volatile u8 v_sync_end; | |
104 | volatile u8 xfer_holdoff_start; | |
105 | volatile u8 xfer_holdoff_end; | |
106 | }; | |
107 | ||
108 | /* Offset of interesting structures in the OBIO space */ | |
109 | #define CG3_REGS_OFFSET 0x400000UL | |
110 | #define CG3_RAM_OFFSET 0x800000UL | |
111 | ||
112 | struct cg3_par { | |
113 | spinlock_t lock; | |
114 | struct cg3_regs __iomem *regs; | |
115 | u32 sw_cmap[((256 * 3) + 3) / 4]; | |
116 | ||
117 | u32 flags; | |
118 | #define CG3_FLAG_BLANKED 0x00000001 | |
119 | #define CG3_FLAG_RDI 0x00000002 | |
120 | ||
121 | unsigned long physbase; | |
122 | unsigned long fbsize; | |
123 | ||
124 | struct sbus_dev *sdev; | |
125 | struct list_head list; | |
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 | |
190 | cg3_blank(int blank, struct fb_info *info) | |
191 | { | |
192 | struct cg3_par *par = (struct cg3_par *) info->par; | |
193 | struct cg3_regs __iomem *regs = par->regs; | |
194 | unsigned long flags; | |
195 | u8 val; | |
196 | ||
197 | spin_lock_irqsave(&par->lock, flags); | |
198 | ||
199 | switch (blank) { | |
200 | case FB_BLANK_UNBLANK: /* Unblanking */ | |
201 | val = sbus_readb(®s->control); | |
202 | val |= CG3_CR_ENABLE_VIDEO; | |
203 | sbus_writeb(val, ®s->control); | |
204 | par->flags &= ~CG3_FLAG_BLANKED; | |
205 | break; | |
206 | ||
207 | case FB_BLANK_NORMAL: /* Normal blanking */ | |
208 | case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */ | |
209 | case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */ | |
210 | case FB_BLANK_POWERDOWN: /* Poweroff */ | |
211 | val = sbus_readb(®s->control); | |
212 | val &= ~CG3_CR_ENABLE_VIDEO; | |
213 | sbus_writeb(val, ®s->control); | |
214 | par->flags |= CG3_FLAG_BLANKED; | |
215 | break; | |
216 | } | |
217 | ||
218 | spin_unlock_irqrestore(&par->lock, flags); | |
219 | ||
220 | return 0; | |
221 | } | |
222 | ||
223 | static struct sbus_mmap_map cg3_mmap_map[] = { | |
224 | { | |
225 | .voff = CG3_MMAP_OFFSET, | |
226 | .poff = CG3_RAM_OFFSET, | |
227 | .size = SBUS_MMAP_FBSIZE(1) | |
228 | }, | |
229 | { .size = 0 } | |
230 | }; | |
231 | ||
232 | static int cg3_mmap(struct fb_info *info, struct file *file, struct vm_area_struct *vma) | |
233 | { | |
234 | struct cg3_par *par = (struct cg3_par *)info->par; | |
235 | ||
236 | return sbusfb_mmap_helper(cg3_mmap_map, | |
237 | par->physbase, par->fbsize, | |
238 | par->sdev->reg_addrs[0].which_io, | |
239 | vma); | |
240 | } | |
241 | ||
242 | static int cg3_ioctl(struct inode *inode, struct file *file, unsigned int cmd, | |
243 | unsigned long arg, struct fb_info *info) | |
244 | { | |
245 | struct cg3_par *par = (struct cg3_par *) info->par; | |
246 | ||
247 | return sbusfb_ioctl_helper(cmd, arg, info, | |
248 | FBTYPE_SUN3COLOR, 8, par->fbsize); | |
249 | } | |
250 | ||
251 | /* | |
252 | * Initialisation | |
253 | */ | |
254 | ||
255 | static void | |
256 | cg3_init_fix(struct fb_info *info, int linebytes) | |
257 | { | |
258 | struct cg3_par *par = (struct cg3_par *)info->par; | |
259 | ||
260 | strlcpy(info->fix.id, par->sdev->prom_name, sizeof(info->fix.id)); | |
261 | ||
262 | info->fix.type = FB_TYPE_PACKED_PIXELS; | |
263 | info->fix.visual = FB_VISUAL_PSEUDOCOLOR; | |
264 | ||
265 | info->fix.line_length = linebytes; | |
266 | ||
267 | info->fix.accel = FB_ACCEL_SUN_CGTHREE; | |
268 | } | |
269 | ||
270 | static void cg3_rdi_maybe_fixup_var(struct fb_var_screeninfo *var, | |
271 | struct sbus_dev *sdev) | |
272 | { | |
273 | char buffer[40]; | |
274 | char *p; | |
275 | int ww, hh; | |
276 | ||
277 | *buffer = 0; | |
278 | prom_getstring(sdev->prom_node, "params", buffer, sizeof(buffer)); | |
279 | if (*buffer) { | |
280 | ww = simple_strtoul(buffer, &p, 10); | |
281 | if (ww && *p == 'x') { | |
282 | hh = simple_strtoul(p + 1, &p, 10); | |
283 | if (hh && *p == '-') { | |
284 | if (var->xres != ww || | |
285 | var->yres != hh) { | |
286 | var->xres = var->xres_virtual = ww; | |
287 | var->yres = var->yres_virtual = hh; | |
288 | } | |
289 | } | |
290 | } | |
291 | } | |
292 | } | |
293 | ||
294 | static u8 cg3regvals_66hz[] __initdata = { /* 1152 x 900, 66 Hz */ | |
295 | 0x14, 0xbb, 0x15, 0x2b, 0x16, 0x04, 0x17, 0x14, | |
296 | 0x18, 0xae, 0x19, 0x03, 0x1a, 0xa8, 0x1b, 0x24, | |
297 | 0x1c, 0x01, 0x1d, 0x05, 0x1e, 0xff, 0x1f, 0x01, | |
298 | 0x10, 0x20, 0 | |
299 | }; | |
300 | ||
301 | static u8 cg3regvals_76hz[] __initdata = { /* 1152 x 900, 76 Hz */ | |
302 | 0x14, 0xb7, 0x15, 0x27, 0x16, 0x03, 0x17, 0x0f, | |
303 | 0x18, 0xae, 0x19, 0x03, 0x1a, 0xae, 0x1b, 0x2a, | |
304 | 0x1c, 0x01, 0x1d, 0x09, 0x1e, 0xff, 0x1f, 0x01, | |
305 | 0x10, 0x24, 0 | |
306 | }; | |
307 | ||
308 | static u8 cg3regvals_rdi[] __initdata = { /* 640 x 480, cgRDI */ | |
309 | 0x14, 0x70, 0x15, 0x20, 0x16, 0x08, 0x17, 0x10, | |
310 | 0x18, 0x06, 0x19, 0x02, 0x1a, 0x31, 0x1b, 0x51, | |
311 | 0x1c, 0x06, 0x1d, 0x0c, 0x1e, 0xff, 0x1f, 0x01, | |
312 | 0x10, 0x22, 0 | |
313 | }; | |
314 | ||
315 | static u8 *cg3_regvals[] __initdata = { | |
316 | cg3regvals_66hz, cg3regvals_76hz, cg3regvals_rdi | |
317 | }; | |
318 | ||
319 | static u_char cg3_dacvals[] __initdata = { | |
320 | 4, 0xff, 5, 0x00, 6, 0x70, 7, 0x00, 0 | |
321 | }; | |
322 | ||
323 | static void cg3_do_default_mode(struct cg3_par *par) | |
324 | { | |
325 | enum cg3_type type; | |
326 | u8 *p; | |
327 | ||
328 | if (par->flags & CG3_FLAG_RDI) | |
329 | type = CG3_RDI; | |
330 | else { | |
331 | u8 status = sbus_readb(&par->regs->status), mon; | |
332 | if ((status & CG3_SR_ID_MASK) == CG3_SR_ID_COLOR) { | |
333 | mon = status & CG3_SR_RES_MASK; | |
334 | if (mon == CG3_SR_1152_900_76_A || | |
335 | mon == CG3_SR_1152_900_76_B) | |
336 | type = CG3_AT_76HZ; | |
337 | else | |
338 | type = CG3_AT_66HZ; | |
339 | } else { | |
340 | prom_printf("cgthree: can't handle SR %02x\n", | |
341 | status); | |
342 | prom_halt(); | |
343 | return; | |
344 | } | |
345 | } | |
346 | ||
347 | for (p = cg3_regvals[type]; *p; p += 2) { | |
348 | u8 __iomem *regp = &((u8 __iomem *)par->regs)[p[0]]; | |
349 | sbus_writeb(p[1], regp); | |
350 | } | |
351 | for (p = cg3_dacvals; *p; p += 2) { | |
352 | volatile u8 __iomem *regp; | |
353 | ||
354 | regp = (volatile u8 __iomem *)&par->regs->cmap.addr; | |
355 | sbus_writeb(p[0], regp); | |
356 | regp = (volatile u8 __iomem *)&par->regs->cmap.control; | |
357 | sbus_writeb(p[1], regp); | |
358 | } | |
359 | } | |
360 | ||
361 | struct all_info { | |
362 | struct fb_info info; | |
363 | struct cg3_par par; | |
364 | struct list_head list; | |
365 | }; | |
366 | static LIST_HEAD(cg3_list); | |
367 | ||
368 | static void cg3_init_one(struct sbus_dev *sdev) | |
369 | { | |
370 | struct all_info *all; | |
371 | int linebytes; | |
372 | ||
373 | all = kmalloc(sizeof(*all), GFP_KERNEL); | |
374 | if (!all) { | |
375 | printk(KERN_ERR "cg3: Cannot allocate memory.\n"); | |
376 | return; | |
377 | } | |
378 | memset(all, 0, sizeof(*all)); | |
379 | ||
380 | INIT_LIST_HEAD(&all->list); | |
381 | ||
382 | spin_lock_init(&all->par.lock); | |
383 | all->par.sdev = sdev; | |
384 | ||
385 | all->par.physbase = sdev->reg_addrs[0].phys_addr; | |
386 | ||
387 | sbusfb_fill_var(&all->info.var, sdev->prom_node, 8); | |
388 | all->info.var.red.length = 8; | |
389 | all->info.var.green.length = 8; | |
390 | all->info.var.blue.length = 8; | |
391 | if (!strcmp(sdev->prom_name, "cgRDI")) | |
392 | all->par.flags |= CG3_FLAG_RDI; | |
393 | if (all->par.flags & CG3_FLAG_RDI) | |
394 | cg3_rdi_maybe_fixup_var(&all->info.var, sdev); | |
395 | ||
396 | linebytes = prom_getintdefault(sdev->prom_node, "linebytes", | |
397 | all->info.var.xres); | |
398 | all->par.fbsize = PAGE_ALIGN(linebytes * all->info.var.yres); | |
399 | ||
400 | all->par.regs = sbus_ioremap(&sdev->resource[0], CG3_REGS_OFFSET, | |
401 | sizeof(struct cg3_regs), "cg3 regs"); | |
402 | ||
403 | all->info.flags = FBINFO_DEFAULT; | |
404 | all->info.fbops = &cg3_ops; | |
405 | #ifdef CONFIG_SPARC32 | |
406 | all->info.screen_base = (char __iomem *) | |
407 | prom_getintdefault(sdev->prom_node, "address", 0); | |
408 | #endif | |
409 | if (!all->info.screen_base) | |
410 | all->info.screen_base = | |
411 | sbus_ioremap(&sdev->resource[0], CG3_RAM_OFFSET, | |
412 | all->par.fbsize, "cg3 ram"); | |
413 | all->info.par = &all->par; | |
414 | ||
415 | cg3_blank(0, &all->info); | |
416 | ||
417 | if (!prom_getbool(sdev->prom_node, "width")) | |
418 | cg3_do_default_mode(&all->par); | |
419 | ||
420 | if (fb_alloc_cmap(&all->info.cmap, 256, 0)) { | |
421 | printk(KERN_ERR "cg3: Could not allocate color map.\n"); | |
422 | kfree(all); | |
423 | return; | |
424 | } | |
425 | fb_set_cmap(&all->info.cmap, &all->info); | |
426 | ||
427 | cg3_init_fix(&all->info, linebytes); | |
428 | ||
429 | if (register_framebuffer(&all->info) < 0) { | |
430 | printk(KERN_ERR "cg3: Could not register framebuffer.\n"); | |
431 | fb_dealloc_cmap(&all->info.cmap); | |
432 | kfree(all); | |
433 | return; | |
434 | } | |
435 | ||
436 | list_add(&all->list, &cg3_list); | |
437 | ||
438 | printk("cg3: %s at %lx:%lx\n", | |
439 | sdev->prom_name, | |
440 | (long) sdev->reg_addrs[0].which_io, | |
441 | (long) sdev->reg_addrs[0].phys_addr); | |
442 | } | |
443 | ||
444 | int __init cg3_init(void) | |
445 | { | |
446 | struct sbus_bus *sbus; | |
447 | struct sbus_dev *sdev; | |
448 | ||
449 | if (fb_get_options("cg3fb", NULL)) | |
450 | return -ENODEV; | |
451 | ||
452 | for_all_sbusdev(sdev, sbus) { | |
453 | if (!strcmp(sdev->prom_name, "cgthree") || | |
454 | !strcmp(sdev->prom_name, "cgRDI")) | |
455 | cg3_init_one(sdev); | |
456 | } | |
457 | ||
458 | return 0; | |
459 | } | |
460 | ||
461 | void __exit cg3_exit(void) | |
462 | { | |
463 | struct list_head *pos, *tmp; | |
464 | ||
465 | list_for_each_safe(pos, tmp, &cg3_list) { | |
466 | struct all_info *all = list_entry(pos, typeof(*all), list); | |
467 | ||
468 | unregister_framebuffer(&all->info); | |
469 | fb_dealloc_cmap(&all->info.cmap); | |
470 | kfree(all); | |
471 | } | |
472 | } | |
473 | ||
474 | int __init | |
475 | cg3_setup(char *arg) | |
476 | { | |
477 | /* No cmdline options yet... */ | |
478 | return 0; | |
479 | } | |
480 | ||
481 | module_init(cg3_init); | |
482 | ||
483 | #ifdef MODULE | |
484 | module_exit(cg3_exit); | |
485 | #endif | |
486 | ||
487 | MODULE_DESCRIPTION("framebuffer driver for CGthree chipsets"); | |
488 | MODULE_AUTHOR("David S. Miller <davem@redhat.com>"); | |
489 | MODULE_LICENSE("GPL"); |