CRED: Wrap task credential accesses in the JFS filesystem
[linux-2.6.git] / drivers / video / bw2.c
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
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(&regs->control);
137                 val |= BWTWO_CTL_ENABLE_VIDEO;
138                 sbus_writeb(val, &regs->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(&regs->control);
147                 val &= ~BWTWO_CTL_ENABLE_VIDEO;
148                 sbus_writeb(val, &regs->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
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
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
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
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
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
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
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
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");