fbdev/amifb: Correct check for video memory size
[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/delay.h>
16 #include <linux/init.h>
17 #include <linux/fb.h>
18 #include <linux/mm.h>
19 #include <linux/of_device.h>
20
21 #include <asm/io.h>
22 #include <asm/fbio.h>
23
24 #include "sbuslib.h"
25
26 /*
27  * Local functions.
28  */
29
30 static int bw2_blank(int, struct fb_info *);
31
32 static int bw2_mmap(struct fb_info *, struct vm_area_struct *);
33 static int bw2_ioctl(struct fb_info *, unsigned int, unsigned long);
34
35 /*
36  *  Frame buffer operations
37  */
38
39 static struct fb_ops bw2_ops = {
40         .owner                  = THIS_MODULE,
41         .fb_blank               = bw2_blank,
42         .fb_fillrect            = cfb_fillrect,
43         .fb_copyarea            = cfb_copyarea,
44         .fb_imageblit           = cfb_imageblit,
45         .fb_mmap                = bw2_mmap,
46         .fb_ioctl               = bw2_ioctl,
47 #ifdef CONFIG_COMPAT
48         .fb_compat_ioctl        = sbusfb_compat_ioctl,
49 #endif
50 };
51
52 /* OBio addresses for the bwtwo registers */
53 #define BWTWO_REGISTER_OFFSET 0x400000
54
55 struct bt_regs {
56         u32 addr;
57         u32 color_map;
58         u32 control;
59         u32 cursor;
60 };
61
62 struct bw2_regs {
63         struct bt_regs  cmap;
64         u8      control;
65         u8      status;
66         u8      cursor_start;
67         u8      cursor_end;
68         u8      h_blank_start;
69         u8      h_blank_end;
70         u8      h_sync_start;
71         u8      h_sync_end;
72         u8      comp_sync_end;
73         u8      v_blank_start_high;
74         u8      v_blank_start_low;
75         u8      v_blank_end;
76         u8      v_sync_start;
77         u8      v_sync_end;
78         u8      xfer_holdoff_start;
79         u8      xfer_holdoff_end;
80 };
81
82 /* Status Register Constants */
83 #define BWTWO_SR_RES_MASK       0x70
84 #define BWTWO_SR_1600_1280      0x50
85 #define BWTWO_SR_1152_900_76_A  0x40
86 #define BWTWO_SR_1152_900_76_B  0x60
87 #define BWTWO_SR_ID_MASK        0x0f
88 #define BWTWO_SR_ID_MONO        0x02
89 #define BWTWO_SR_ID_MONO_ECL    0x03
90 #define BWTWO_SR_ID_MSYNC       0x04
91 #define BWTWO_SR_ID_NOCONN      0x0a
92
93 /* Control Register Constants */
94 #define BWTWO_CTL_ENABLE_INTS   0x80
95 #define BWTWO_CTL_ENABLE_VIDEO  0x40
96 #define BWTWO_CTL_ENABLE_TIMING 0x20
97 #define BWTWO_CTL_ENABLE_CURCMP 0x10
98 #define BWTWO_CTL_XTAL_MASK     0x0C
99 #define BWTWO_CTL_DIVISOR_MASK  0x03
100
101 /* Status Register Constants */
102 #define BWTWO_STAT_PENDING_INT  0x80
103 #define BWTWO_STAT_MSENSE_MASK  0x70
104 #define BWTWO_STAT_ID_MASK      0x0f
105
106 struct bw2_par {
107         spinlock_t              lock;
108         struct bw2_regs         __iomem *regs;
109
110         u32                     flags;
111 #define BW2_FLAG_BLANKED        0x00000001
112
113         unsigned long           which_io;
114 };
115
116 /**
117  *      bw2_blank - Optional function.  Blanks the display.
118  *      @blank_mode: the blank mode we want.
119  *      @info: frame buffer structure that represents a single frame buffer
120  */
121 static int
122 bw2_blank(int blank, struct fb_info *info)
123 {
124         struct bw2_par *par = (struct bw2_par *) info->par;
125         struct bw2_regs __iomem *regs = par->regs;
126         unsigned long flags;
127         u8 val;
128
129         spin_lock_irqsave(&par->lock, flags);
130
131         switch (blank) {
132         case FB_BLANK_UNBLANK: /* Unblanking */
133                 val = sbus_readb(&regs->control);
134                 val |= BWTWO_CTL_ENABLE_VIDEO;
135                 sbus_writeb(val, &regs->control);
136                 par->flags &= ~BW2_FLAG_BLANKED;
137                 break;
138
139         case FB_BLANK_NORMAL: /* Normal blanking */
140         case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */
141         case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
142         case FB_BLANK_POWERDOWN: /* Poweroff */
143                 val = sbus_readb(&regs->control);
144                 val &= ~BWTWO_CTL_ENABLE_VIDEO;
145                 sbus_writeb(val, &regs->control);
146                 par->flags |= BW2_FLAG_BLANKED;
147                 break;
148         }
149
150         spin_unlock_irqrestore(&par->lock, flags);
151
152         return 0;
153 }
154
155 static struct sbus_mmap_map bw2_mmap_map[] = {
156         {
157                 .size = SBUS_MMAP_FBSIZE(1)
158         },
159         { .size = 0 }
160 };
161
162 static int bw2_mmap(struct fb_info *info, struct vm_area_struct *vma)
163 {
164         struct bw2_par *par = (struct bw2_par *)info->par;
165
166         return sbusfb_mmap_helper(bw2_mmap_map,
167                                   info->fix.smem_start, info->fix.smem_len,
168                                   par->which_io,
169                                   vma);
170 }
171
172 static int bw2_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
173 {
174         return sbusfb_ioctl_helper(cmd, arg, info,
175                                    FBTYPE_SUN2BW, 1, info->fix.smem_len);
176 }
177
178 /*
179  *  Initialisation
180  */
181
182 static void __devinit bw2_init_fix(struct fb_info *info, int linebytes)
183 {
184         strlcpy(info->fix.id, "bwtwo", sizeof(info->fix.id));
185
186         info->fix.type = FB_TYPE_PACKED_PIXELS;
187         info->fix.visual = FB_VISUAL_MONO01;
188
189         info->fix.line_length = linebytes;
190
191         info->fix.accel = FB_ACCEL_SUN_BWTWO;
192 }
193
194 static u8 bw2regs_1600[] __devinitdata = {
195         0x14, 0x8b,     0x15, 0x28,     0x16, 0x03,     0x17, 0x13,
196         0x18, 0x7b,     0x19, 0x05,     0x1a, 0x34,     0x1b, 0x2e,
197         0x1c, 0x00,     0x1d, 0x0a,     0x1e, 0xff,     0x1f, 0x01,
198         0x10, 0x21,     0
199 };
200
201 static u8 bw2regs_ecl[] __devinitdata = {
202         0x14, 0x65,     0x15, 0x1e,     0x16, 0x04,     0x17, 0x0c,
203         0x18, 0x5e,     0x19, 0x03,     0x1a, 0xa7,     0x1b, 0x23,
204         0x1c, 0x00,     0x1d, 0x08,     0x1e, 0xff,     0x1f, 0x01,
205         0x10, 0x20,     0
206 };
207
208 static u8 bw2regs_analog[] __devinitdata = {
209         0x14, 0xbb,     0x15, 0x2b,     0x16, 0x03,     0x17, 0x13,
210         0x18, 0xb0,     0x19, 0x03,     0x1a, 0xa6,     0x1b, 0x22,
211         0x1c, 0x01,     0x1d, 0x05,     0x1e, 0xff,     0x1f, 0x01,
212         0x10, 0x20,     0
213 };
214
215 static u8 bw2regs_76hz[] __devinitdata = {
216         0x14, 0xb7,     0x15, 0x27,     0x16, 0x03,     0x17, 0x0f,
217         0x18, 0xae,     0x19, 0x03,     0x1a, 0xae,     0x1b, 0x2a,
218         0x1c, 0x01,     0x1d, 0x09,     0x1e, 0xff,     0x1f, 0x01,
219         0x10, 0x24,     0
220 };
221
222 static u8 bw2regs_66hz[] __devinitdata = {
223         0x14, 0xbb,     0x15, 0x2b,     0x16, 0x04,     0x17, 0x14,
224         0x18, 0xae,     0x19, 0x03,     0x1a, 0xa8,     0x1b, 0x24,
225         0x1c, 0x01,     0x1d, 0x05,     0x1e, 0xff,     0x1f, 0x01,
226         0x10, 0x20,     0
227 };
228
229 static int __devinit bw2_do_default_mode(struct bw2_par *par,
230                                          struct fb_info *info,
231                                          int *linebytes)
232 {
233         u8 status, mon;
234         u8 *p;
235
236         status = sbus_readb(&par->regs->status);
237         mon = status & BWTWO_SR_RES_MASK;
238         switch (status & BWTWO_SR_ID_MASK) {
239         case BWTWO_SR_ID_MONO_ECL:
240                 if (mon == BWTWO_SR_1600_1280) {
241                         p = bw2regs_1600;
242                         info->var.xres = info->var.xres_virtual = 1600;
243                         info->var.yres = info->var.yres_virtual = 1280;
244                         *linebytes = 1600 / 8;
245                 } else
246                         p = bw2regs_ecl;
247                 break;
248
249         case BWTWO_SR_ID_MONO:
250                 p = bw2regs_analog;
251                 break;
252
253         case BWTWO_SR_ID_MSYNC:
254                 if (mon == BWTWO_SR_1152_900_76_A ||
255                     mon == BWTWO_SR_1152_900_76_B)
256                         p = bw2regs_76hz;
257                 else
258                         p = bw2regs_66hz;
259                 break;
260
261         case BWTWO_SR_ID_NOCONN:
262                 return 0;
263
264         default:
265                 printk(KERN_ERR "bw2: can't handle SR %02x\n",
266                        status);
267                 return -EINVAL;
268         }
269         for ( ; *p; p += 2) {
270                 u8 __iomem *regp = &((u8 __iomem *)par->regs)[p[0]];
271                 sbus_writeb(p[1], regp);
272         }
273         return 0;
274 }
275
276 static int __devinit bw2_probe(struct platform_device *op)
277 {
278         struct device_node *dp = op->dev.of_node;
279         struct fb_info *info;
280         struct bw2_par *par;
281         int linebytes, err;
282
283         info = framebuffer_alloc(sizeof(struct bw2_par), &op->dev);
284
285         err = -ENOMEM;
286         if (!info)
287                 goto out_err;
288         par = info->par;
289
290         spin_lock_init(&par->lock);
291
292         info->fix.smem_start = op->resource[0].start;
293         par->which_io = op->resource[0].flags & IORESOURCE_BITS;
294
295         sbusfb_fill_var(&info->var, dp, 1);
296         linebytes = of_getintprop_default(dp, "linebytes",
297                                           info->var.xres);
298
299         info->var.red.length = info->var.green.length =
300                 info->var.blue.length = info->var.bits_per_pixel;
301         info->var.red.offset = info->var.green.offset =
302                 info->var.blue.offset = 0;
303
304         par->regs = of_ioremap(&op->resource[0], BWTWO_REGISTER_OFFSET,
305                                sizeof(struct bw2_regs), "bw2 regs");
306         if (!par->regs)
307                 goto out_release_fb;
308
309         if (!of_find_property(dp, "width", NULL)) {
310                 err = bw2_do_default_mode(par, info, &linebytes);
311                 if (err)
312                         goto out_unmap_regs;
313         }
314
315         info->fix.smem_len = PAGE_ALIGN(linebytes * info->var.yres);
316
317         info->flags = FBINFO_DEFAULT;
318         info->fbops = &bw2_ops;
319
320         info->screen_base = of_ioremap(&op->resource[0], 0,
321                                        info->fix.smem_len, "bw2 ram");
322         if (!info->screen_base)
323                 goto out_unmap_regs;
324
325         bw2_blank(FB_BLANK_UNBLANK, info);
326
327         bw2_init_fix(info, linebytes);
328
329         err = register_framebuffer(info);
330         if (err < 0)
331                 goto out_unmap_screen;
332
333         dev_set_drvdata(&op->dev, info);
334
335         printk(KERN_INFO "%s: bwtwo at %lx:%lx\n",
336                dp->full_name, par->which_io, info->fix.smem_start);
337
338         return 0;
339
340 out_unmap_screen:
341         of_iounmap(&op->resource[0], info->screen_base, info->fix.smem_len);
342
343 out_unmap_regs:
344         of_iounmap(&op->resource[0], par->regs, sizeof(struct bw2_regs));
345
346 out_release_fb:
347         framebuffer_release(info);
348
349 out_err:
350         return err;
351 }
352
353 static int __devexit bw2_remove(struct platform_device *op)
354 {
355         struct fb_info *info = dev_get_drvdata(&op->dev);
356         struct bw2_par *par = info->par;
357
358         unregister_framebuffer(info);
359
360         of_iounmap(&op->resource[0], par->regs, sizeof(struct bw2_regs));
361         of_iounmap(&op->resource[0], info->screen_base, info->fix.smem_len);
362
363         framebuffer_release(info);
364
365         dev_set_drvdata(&op->dev, NULL);
366
367         return 0;
368 }
369
370 static const struct of_device_id bw2_match[] = {
371         {
372                 .name = "bwtwo",
373         },
374         {},
375 };
376 MODULE_DEVICE_TABLE(of, bw2_match);
377
378 static struct platform_driver bw2_driver = {
379         .driver = {
380                 .name = "bw2",
381                 .owner = THIS_MODULE,
382                 .of_match_table = bw2_match,
383         },
384         .probe          = bw2_probe,
385         .remove         = __devexit_p(bw2_remove),
386 };
387
388 static int __init bw2_init(void)
389 {
390         if (fb_get_options("bw2fb", NULL))
391                 return -ENODEV;
392
393         return platform_driver_register(&bw2_driver);
394 }
395
396 static void __exit bw2_exit(void)
397 {
398         platform_driver_unregister(&bw2_driver);
399 }
400
401 module_init(bw2_init);
402 module_exit(bw2_exit);
403
404 MODULE_DESCRIPTION("framebuffer driver for BWTWO chipsets");
405 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
406 MODULE_VERSION("2.0");
407 MODULE_LICENSE("GPL");