1 /* bw2.c: BWTWO 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 #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 bw2_blank(int, struct fb_info *);
32
33 static int bw2_mmap(struct fb_info *, struct vm_area_struct *);
34 static int bw2_ioctl(struct fb_info *, unsigned int, unsigned long);
35
36 /*
37 * Frame buffer operations
38 */
39
40 static struct fb_ops bw2_ops = {
41 .owner = THIS_MODULE,
42 .fb_blank = bw2_blank,
43 .fb_fillrect = cfb_fillrect,
44 .fb_copyarea = cfb_copyarea,
45 .fb_imageblit = cfb_imageblit,
46 .fb_mmap = bw2_mmap,
47 .fb_ioctl = bw2_ioctl,
48 #ifdef CONFIG_COMPAT
49 .fb_compat_ioctl = sbusfb_compat_ioctl,
50 #endif
51 };
52
53 /* OBio addresses for the bwtwo registers */
54 #define BWTWO_REGISTER_OFFSET 0x400000
55
56 struct bt_regs {
57 u32 addr;
58 u32 color_map;
59 u32 control;
60 u32 cursor;
61 };
62
63 struct bw2_regs {
64 struct bt_regs cmap;
65 u8 control;
66 u8 status;
67 u8 cursor_start;
68 u8 cursor_end;
69 u8 h_blank_start;
70 u8 h_blank_end;
71 u8 h_sync_start;
72 u8 h_sync_end;
73 u8 comp_sync_end;
74 u8 v_blank_start_high;
75 u8 v_blank_start_low;
76 u8 v_blank_end;
77 u8 v_sync_start;
78 u8 v_sync_end;
79 u8 xfer_holdoff_start;
80 u8 xfer_holdoff_end;
81 };
82
83 /* Status Register Constants */
84 #define BWTWO_SR_RES_MASK 0x70
85 #define BWTWO_SR_1600_1280 0x50
86 #define BWTWO_SR_1152_900_76_A 0x40
87 #define BWTWO_SR_1152_900_76_B 0x60
88 #define BWTWO_SR_ID_MASK 0x0f
89 #define BWTWO_SR_ID_MONO 0x02
90 #define BWTWO_SR_ID_MONO_ECL 0x03
91 #define BWTWO_SR_ID_MSYNC 0x04
92 #define BWTWO_SR_ID_NOCONN 0x0a
93
94 /* Control Register Constants */
95 #define BWTWO_CTL_ENABLE_INTS 0x80
96 #define BWTWO_CTL_ENABLE_VIDEO 0x40
97 #define BWTWO_CTL_ENABLE_TIMING 0x20
98 #define BWTWO_CTL_ENABLE_CURCMP 0x10
99 #define BWTWO_CTL_XTAL_MASK 0x0C
100 #define BWTWO_CTL_DIVISOR_MASK 0x03
101
102 /* Status Register Constants */
103 #define BWTWO_STAT_PENDING_INT 0x80
104 #define BWTWO_STAT_MSENSE_MASK 0x70
105 #define BWTWO_STAT_ID_MASK 0x0f
106
107 struct bw2_par {
108 spinlock_t lock;
109 struct bw2_regs __iomem *regs;
110
111 u32 flags;
112 #define BW2_FLAG_BLANKED 0x00000001
113
114 unsigned long physbase;
115 unsigned long which_io;
116 unsigned long fbsize;
117 };
118
119 /**
120 * bw2_blank - Optional function. Blanks the display.
121 * @blank_mode: the blank mode we want.
122 * @info: frame buffer structure that represents a single frame buffer
123 */
124 static int
bw2_blank(int blank,struct fb_info * info)125 bw2_blank(int blank, struct fb_info *info)
126 {
127 struct bw2_par *par = (struct bw2_par *) info->par;
128 struct bw2_regs __iomem *regs = par->regs;
129 unsigned long flags;
130 u8 val;
131
132 spin_lock_irqsave(&par->lock, flags);
133
134 switch (blank) {
135 case FB_BLANK_UNBLANK: /* Unblanking */
136 val = sbus_readb(®s->control);
137 val |= BWTWO_CTL_ENABLE_VIDEO;
138 sbus_writeb(val, ®s->control);
139 par->flags &= ~BW2_FLAG_BLANKED;
140 break;
141
142 case FB_BLANK_NORMAL: /* Normal blanking */
143 case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */
144 case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
145 case FB_BLANK_POWERDOWN: /* Poweroff */
146 val = sbus_readb(®s->control);
147 val &= ~BWTWO_CTL_ENABLE_VIDEO;
148 sbus_writeb(val, ®s->control);
149 par->flags |= BW2_FLAG_BLANKED;
150 break;
151 }
152
153 spin_unlock_irqrestore(&par->lock, flags);
154
155 return 0;
156 }
157
158 static struct sbus_mmap_map bw2_mmap_map[] = {
159 {
160 .size = SBUS_MMAP_FBSIZE(1)
161 },
162 { .size = 0 }
163 };
164
bw2_mmap(struct fb_info * info,struct vm_area_struct * vma)165 static int bw2_mmap(struct fb_info *info, struct vm_area_struct *vma)
166 {
167 struct bw2_par *par = (struct bw2_par *)info->par;
168
169 return sbusfb_mmap_helper(bw2_mmap_map,
170 par->physbase, par->fbsize,
171 par->which_io,
172 vma);
173 }
174
bw2_ioctl(struct fb_info * info,unsigned int cmd,unsigned long arg)175 static int bw2_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
176 {
177 struct bw2_par *par = (struct bw2_par *) info->par;
178
179 return sbusfb_ioctl_helper(cmd, arg, info,
180 FBTYPE_SUN2BW, 1, par->fbsize);
181 }
182
183 /*
184 * Initialisation
185 */
186
bw2_init_fix(struct fb_info * info,int linebytes)187 static void __devinit bw2_init_fix(struct fb_info *info, int linebytes)
188 {
189 strlcpy(info->fix.id, "bwtwo", sizeof(info->fix.id));
190
191 info->fix.type = FB_TYPE_PACKED_PIXELS;
192 info->fix.visual = FB_VISUAL_MONO01;
193
194 info->fix.line_length = linebytes;
195
196 info->fix.accel = FB_ACCEL_SUN_BWTWO;
197 }
198
199 static u8 bw2regs_1600[] __devinitdata = {
200 0x14, 0x8b, 0x15, 0x28, 0x16, 0x03, 0x17, 0x13,
201 0x18, 0x7b, 0x19, 0x05, 0x1a, 0x34, 0x1b, 0x2e,
202 0x1c, 0x00, 0x1d, 0x0a, 0x1e, 0xff, 0x1f, 0x01,
203 0x10, 0x21, 0
204 };
205
206 static u8 bw2regs_ecl[] __devinitdata = {
207 0x14, 0x65, 0x15, 0x1e, 0x16, 0x04, 0x17, 0x0c,
208 0x18, 0x5e, 0x19, 0x03, 0x1a, 0xa7, 0x1b, 0x23,
209 0x1c, 0x00, 0x1d, 0x08, 0x1e, 0xff, 0x1f, 0x01,
210 0x10, 0x20, 0
211 };
212
213 static u8 bw2regs_analog[] __devinitdata = {
214 0x14, 0xbb, 0x15, 0x2b, 0x16, 0x03, 0x17, 0x13,
215 0x18, 0xb0, 0x19, 0x03, 0x1a, 0xa6, 0x1b, 0x22,
216 0x1c, 0x01, 0x1d, 0x05, 0x1e, 0xff, 0x1f, 0x01,
217 0x10, 0x20, 0
218 };
219
220 static u8 bw2regs_76hz[] __devinitdata = {
221 0x14, 0xb7, 0x15, 0x27, 0x16, 0x03, 0x17, 0x0f,
222 0x18, 0xae, 0x19, 0x03, 0x1a, 0xae, 0x1b, 0x2a,
223 0x1c, 0x01, 0x1d, 0x09, 0x1e, 0xff, 0x1f, 0x01,
224 0x10, 0x24, 0
225 };
226
227 static u8 bw2regs_66hz[] __devinitdata = {
228 0x14, 0xbb, 0x15, 0x2b, 0x16, 0x04, 0x17, 0x14,
229 0x18, 0xae, 0x19, 0x03, 0x1a, 0xa8, 0x1b, 0x24,
230 0x1c, 0x01, 0x1d, 0x05, 0x1e, 0xff, 0x1f, 0x01,
231 0x10, 0x20, 0
232 };
233
bw2_do_default_mode(struct bw2_par * par,struct fb_info * info,int * linebytes)234 static int __devinit bw2_do_default_mode(struct bw2_par *par,
235 struct fb_info *info,
236 int *linebytes)
237 {
238 u8 status, mon;
239 u8 *p;
240
241 status = sbus_readb(&par->regs->status);
242 mon = status & BWTWO_SR_RES_MASK;
243 switch (status & BWTWO_SR_ID_MASK) {
244 case BWTWO_SR_ID_MONO_ECL:
245 if (mon == BWTWO_SR_1600_1280) {
246 p = bw2regs_1600;
247 info->var.xres = info->var.xres_virtual = 1600;
248 info->var.yres = info->var.yres_virtual = 1280;
249 *linebytes = 1600 / 8;
250 } else
251 p = bw2regs_ecl;
252 break;
253
254 case BWTWO_SR_ID_MONO:
255 p = bw2regs_analog;
256 break;
257
258 case BWTWO_SR_ID_MSYNC:
259 if (mon == BWTWO_SR_1152_900_76_A ||
260 mon == BWTWO_SR_1152_900_76_B)
261 p = bw2regs_76hz;
262 else
263 p = bw2regs_66hz;
264 break;
265
266 case BWTWO_SR_ID_NOCONN:
267 return 0;
268
269 default:
270 printk(KERN_ERR "bw2: can't handle SR %02x\n",
271 status);
272 return -EINVAL;
273 }
274 for ( ; *p; p += 2) {
275 u8 __iomem *regp = &((u8 __iomem *)par->regs)[p[0]];
276 sbus_writeb(p[1], regp);
277 }
278 return 0;
279 }
280
bw2_probe(struct of_device * op,const struct of_device_id * match)281 static int __devinit bw2_probe(struct of_device *op, const struct of_device_id *match)
282 {
283 struct device_node *dp = op->node;
284 struct fb_info *info;
285 struct bw2_par *par;
286 int linebytes, err;
287
288 info = framebuffer_alloc(sizeof(struct bw2_par), &op->dev);
289
290 err = -ENOMEM;
291 if (!info)
292 goto out_err;
293 par = info->par;
294
295 spin_lock_init(&par->lock);
296
297 par->physbase = op->resource[0].start;
298 par->which_io = op->resource[0].flags & IORESOURCE_BITS;
299
300 sbusfb_fill_var(&info->var, dp, 1);
301 linebytes = of_getintprop_default(dp, "linebytes",
302 info->var.xres);
303
304 info->var.red.length = info->var.green.length =
305 info->var.blue.length = info->var.bits_per_pixel;
306 info->var.red.offset = info->var.green.offset =
307 info->var.blue.offset = 0;
308
309 par->regs = of_ioremap(&op->resource[0], BWTWO_REGISTER_OFFSET,
310 sizeof(struct bw2_regs), "bw2 regs");
311 if (!par->regs)
312 goto out_release_fb;
313
314 if (!of_find_property(dp, "width", NULL)) {
315 err = bw2_do_default_mode(par, info, &linebytes);
316 if (err)
317 goto out_unmap_regs;
318 }
319
320 par->fbsize = PAGE_ALIGN(linebytes * info->var.yres);
321
322 info->flags = FBINFO_DEFAULT;
323 info->fbops = &bw2_ops;
324
325 info->screen_base = of_ioremap(&op->resource[0], 0,
326 par->fbsize, "bw2 ram");
327 if (!info->screen_base)
328 goto out_unmap_regs;
329
330 bw2_blank(FB_BLANK_UNBLANK, info);
331
332 bw2_init_fix(info, linebytes);
333
334 err = register_framebuffer(info);
335 if (err < 0)
336 goto out_unmap_screen;
337
338 dev_set_drvdata(&op->dev, info);
339
340 printk(KERN_INFO "%s: bwtwo at %lx:%lx\n",
341 dp->full_name, par->which_io, par->physbase);
342
343 return 0;
344
345 out_unmap_screen:
346 of_iounmap(&op->resource[0], info->screen_base, par->fbsize);
347
348 out_unmap_regs:
349 of_iounmap(&op->resource[0], par->regs, sizeof(struct bw2_regs));
350
351 out_release_fb:
352 framebuffer_release(info);
353
354 out_err:
355 return err;
356 }
357
bw2_remove(struct of_device * op)358 static int __devexit bw2_remove(struct of_device *op)
359 {
360 struct fb_info *info = dev_get_drvdata(&op->dev);
361 struct bw2_par *par = info->par;
362
363 unregister_framebuffer(info);
364
365 of_iounmap(&op->resource[0], par->regs, sizeof(struct bw2_regs));
366 of_iounmap(&op->resource[0], info->screen_base, par->fbsize);
367
368 framebuffer_release(info);
369
370 dev_set_drvdata(&op->dev, NULL);
371
372 return 0;
373 }
374
375 static const struct of_device_id bw2_match[] = {
376 {
377 .name = "bwtwo",
378 },
379 {},
380 };
381 MODULE_DEVICE_TABLE(of, bw2_match);
382
383 static struct of_platform_driver bw2_driver = {
384 .name = "bw2",
385 .match_table = bw2_match,
386 .probe = bw2_probe,
387 .remove = __devexit_p(bw2_remove),
388 };
389
bw2_init(void)390 static int __init bw2_init(void)
391 {
392 if (fb_get_options("bw2fb", NULL))
393 return -ENODEV;
394
395 return of_register_driver(&bw2_driver, &of_bus_type);
396 }
397
bw2_exit(void)398 static void __exit bw2_exit(void)
399 {
400 of_unregister_driver(&bw2_driver);
401 }
402
403 module_init(bw2_init);
404 module_exit(bw2_exit);
405
406 MODULE_DESCRIPTION("framebuffer driver for BWTWO chipsets");
407 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
408 MODULE_VERSION("2.0");
409 MODULE_LICENSE("GPL");
410