Merge branch 'master' into for-linus
[pandora-kernel.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           which_io;
115 };
116
117 /**
118  *      bw2_blank - Optional function.  Blanks the display.
119  *      @blank_mode: the blank mode we want.
120  *      @info: frame buffer structure that represents a single frame buffer
121  */
122 static int
123 bw2_blank(int blank, struct fb_info *info)
124 {
125         struct bw2_par *par = (struct bw2_par *) info->par;
126         struct bw2_regs __iomem *regs = par->regs;
127         unsigned long flags;
128         u8 val;
129
130         spin_lock_irqsave(&par->lock, flags);
131
132         switch (blank) {
133         case FB_BLANK_UNBLANK: /* Unblanking */
134                 val = sbus_readb(&regs->control);
135                 val |= BWTWO_CTL_ENABLE_VIDEO;
136                 sbus_writeb(val, &regs->control);
137                 par->flags &= ~BW2_FLAG_BLANKED;
138                 break;
139
140         case FB_BLANK_NORMAL: /* Normal blanking */
141         case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */
142         case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
143         case FB_BLANK_POWERDOWN: /* Poweroff */
144                 val = sbus_readb(&regs->control);
145                 val &= ~BWTWO_CTL_ENABLE_VIDEO;
146                 sbus_writeb(val, &regs->control);
147                 par->flags |= BW2_FLAG_BLANKED;
148                 break;
149         }
150
151         spin_unlock_irqrestore(&par->lock, flags);
152
153         return 0;
154 }
155
156 static struct sbus_mmap_map bw2_mmap_map[] = {
157         {
158                 .size = SBUS_MMAP_FBSIZE(1)
159         },
160         { .size = 0 }
161 };
162
163 static int bw2_mmap(struct fb_info *info, struct vm_area_struct *vma)
164 {
165         struct bw2_par *par = (struct bw2_par *)info->par;
166
167         return sbusfb_mmap_helper(bw2_mmap_map,
168                                   info->fix.smem_start, info->fix.smem_len,
169                                   par->which_io,
170                                   vma);
171 }
172
173 static int bw2_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
174 {
175         return sbusfb_ioctl_helper(cmd, arg, info,
176                                    FBTYPE_SUN2BW, 1, info->fix.smem_len);
177 }
178
179 /*
180  *  Initialisation
181  */
182
183 static void __devinit bw2_init_fix(struct fb_info *info, int linebytes)
184 {
185         strlcpy(info->fix.id, "bwtwo", sizeof(info->fix.id));
186
187         info->fix.type = FB_TYPE_PACKED_PIXELS;
188         info->fix.visual = FB_VISUAL_MONO01;
189
190         info->fix.line_length = linebytes;
191
192         info->fix.accel = FB_ACCEL_SUN_BWTWO;
193 }
194
195 static u8 bw2regs_1600[] __devinitdata = {
196         0x14, 0x8b,     0x15, 0x28,     0x16, 0x03,     0x17, 0x13,
197         0x18, 0x7b,     0x19, 0x05,     0x1a, 0x34,     0x1b, 0x2e,
198         0x1c, 0x00,     0x1d, 0x0a,     0x1e, 0xff,     0x1f, 0x01,
199         0x10, 0x21,     0
200 };
201
202 static u8 bw2regs_ecl[] __devinitdata = {
203         0x14, 0x65,     0x15, 0x1e,     0x16, 0x04,     0x17, 0x0c,
204         0x18, 0x5e,     0x19, 0x03,     0x1a, 0xa7,     0x1b, 0x23,
205         0x1c, 0x00,     0x1d, 0x08,     0x1e, 0xff,     0x1f, 0x01,
206         0x10, 0x20,     0
207 };
208
209 static u8 bw2regs_analog[] __devinitdata = {
210         0x14, 0xbb,     0x15, 0x2b,     0x16, 0x03,     0x17, 0x13,
211         0x18, 0xb0,     0x19, 0x03,     0x1a, 0xa6,     0x1b, 0x22,
212         0x1c, 0x01,     0x1d, 0x05,     0x1e, 0xff,     0x1f, 0x01,
213         0x10, 0x20,     0
214 };
215
216 static u8 bw2regs_76hz[] __devinitdata = {
217         0x14, 0xb7,     0x15, 0x27,     0x16, 0x03,     0x17, 0x0f,
218         0x18, 0xae,     0x19, 0x03,     0x1a, 0xae,     0x1b, 0x2a,
219         0x1c, 0x01,     0x1d, 0x09,     0x1e, 0xff,     0x1f, 0x01,
220         0x10, 0x24,     0
221 };
222
223 static u8 bw2regs_66hz[] __devinitdata = {
224         0x14, 0xbb,     0x15, 0x2b,     0x16, 0x04,     0x17, 0x14,
225         0x18, 0xae,     0x19, 0x03,     0x1a, 0xa8,     0x1b, 0x24,
226         0x1c, 0x01,     0x1d, 0x05,     0x1e, 0xff,     0x1f, 0x01,
227         0x10, 0x20,     0
228 };
229
230 static int __devinit bw2_do_default_mode(struct bw2_par *par,
231                                          struct fb_info *info,
232                                          int *linebytes)
233 {
234         u8 status, mon;
235         u8 *p;
236
237         status = sbus_readb(&par->regs->status);
238         mon = status & BWTWO_SR_RES_MASK;
239         switch (status & BWTWO_SR_ID_MASK) {
240         case BWTWO_SR_ID_MONO_ECL:
241                 if (mon == BWTWO_SR_1600_1280) {
242                         p = bw2regs_1600;
243                         info->var.xres = info->var.xres_virtual = 1600;
244                         info->var.yres = info->var.yres_virtual = 1280;
245                         *linebytes = 1600 / 8;
246                 } else
247                         p = bw2regs_ecl;
248                 break;
249
250         case BWTWO_SR_ID_MONO:
251                 p = bw2regs_analog;
252                 break;
253
254         case BWTWO_SR_ID_MSYNC:
255                 if (mon == BWTWO_SR_1152_900_76_A ||
256                     mon == BWTWO_SR_1152_900_76_B)
257                         p = bw2regs_76hz;
258                 else
259                         p = bw2regs_66hz;
260                 break;
261
262         case BWTWO_SR_ID_NOCONN:
263                 return 0;
264
265         default:
266                 printk(KERN_ERR "bw2: can't handle SR %02x\n",
267                        status);
268                 return -EINVAL;
269         }
270         for ( ; *p; p += 2) {
271                 u8 __iomem *regp = &((u8 __iomem *)par->regs)[p[0]];
272                 sbus_writeb(p[1], regp);
273         }
274         return 0;
275 }
276
277 static int __devinit bw2_probe(struct of_device *op, const struct of_device_id *match)
278 {
279         struct device_node *dp = op->node;
280         struct fb_info *info;
281         struct bw2_par *par;
282         int linebytes, err;
283
284         info = framebuffer_alloc(sizeof(struct bw2_par), &op->dev);
285
286         err = -ENOMEM;
287         if (!info)
288                 goto out_err;
289         par = info->par;
290
291         spin_lock_init(&par->lock);
292
293         info->fix.smem_start = op->resource[0].start;
294         par->which_io = op->resource[0].flags & IORESOURCE_BITS;
295
296         sbusfb_fill_var(&info->var, dp, 1);
297         linebytes = of_getintprop_default(dp, "linebytes",
298                                           info->var.xres);
299
300         info->var.red.length = info->var.green.length =
301                 info->var.blue.length = info->var.bits_per_pixel;
302         info->var.red.offset = info->var.green.offset =
303                 info->var.blue.offset = 0;
304
305         par->regs = of_ioremap(&op->resource[0], BWTWO_REGISTER_OFFSET,
306                                sizeof(struct bw2_regs), "bw2 regs");
307         if (!par->regs)
308                 goto out_release_fb;
309
310         if (!of_find_property(dp, "width", NULL)) {
311                 err = bw2_do_default_mode(par, info, &linebytes);
312                 if (err)
313                         goto out_unmap_regs;
314         }
315
316         info->fix.smem_len = PAGE_ALIGN(linebytes * info->var.yres);
317
318         info->flags = FBINFO_DEFAULT;
319         info->fbops = &bw2_ops;
320
321         info->screen_base = of_ioremap(&op->resource[0], 0,
322                                        info->fix.smem_len, "bw2 ram");
323         if (!info->screen_base)
324                 goto out_unmap_regs;
325
326         bw2_blank(FB_BLANK_UNBLANK, info);
327
328         bw2_init_fix(info, linebytes);
329
330         err = register_framebuffer(info);
331         if (err < 0)
332                 goto out_unmap_screen;
333
334         dev_set_drvdata(&op->dev, info);
335
336         printk(KERN_INFO "%s: bwtwo at %lx:%lx\n",
337                dp->full_name, par->which_io, info->fix.smem_start);
338
339         return 0;
340
341 out_unmap_screen:
342         of_iounmap(&op->resource[0], info->screen_base, info->fix.smem_len);
343
344 out_unmap_regs:
345         of_iounmap(&op->resource[0], par->regs, sizeof(struct bw2_regs));
346
347 out_release_fb:
348         framebuffer_release(info);
349
350 out_err:
351         return err;
352 }
353
354 static int __devexit bw2_remove(struct of_device *op)
355 {
356         struct fb_info *info = dev_get_drvdata(&op->dev);
357         struct bw2_par *par = info->par;
358
359         unregister_framebuffer(info);
360
361         of_iounmap(&op->resource[0], par->regs, sizeof(struct bw2_regs));
362         of_iounmap(&op->resource[0], info->screen_base, info->fix.smem_len);
363
364         framebuffer_release(info);
365
366         dev_set_drvdata(&op->dev, NULL);
367
368         return 0;
369 }
370
371 static const struct of_device_id bw2_match[] = {
372         {
373                 .name = "bwtwo",
374         },
375         {},
376 };
377 MODULE_DEVICE_TABLE(of, bw2_match);
378
379 static struct of_platform_driver bw2_driver = {
380         .name           = "bw2",
381         .match_table    = bw2_match,
382         .probe          = bw2_probe,
383         .remove         = __devexit_p(bw2_remove),
384 };
385
386 static int __init bw2_init(void)
387 {
388         if (fb_get_options("bw2fb", NULL))
389                 return -ENODEV;
390
391         return of_register_driver(&bw2_driver, &of_bus_type);
392 }
393
394 static void __exit bw2_exit(void)
395 {
396         of_unregister_driver(&bw2_driver);
397 }
398
399 module_init(bw2_init);
400 module_exit(bw2_exit);
401
402 MODULE_DESCRIPTION("framebuffer driver for BWTWO chipsets");
403 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
404 MODULE_VERSION("2.0");
405 MODULE_LICENSE("GPL");