Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
bw2.c
Go to the documentation of this file.
1 /* bw2.c: BWTWO frame buffer driver
2  *
3  * Copyright (C) 2003, 2006 David S. Miller ([email protected])
4  * Copyright (C) 1996,1998 Jakub Jelinek ([email protected])
5  * Copyright (C) 1996 Miguel de Icaza ([email protected])
6  * Copyright (C) 1997 Eddie C. Dost ([email protected])
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 
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  err = -ENOMEM;
324  goto out_unmap_regs;
325  }
326 
327  bw2_blank(FB_BLANK_UNBLANK, info);
328 
329  bw2_init_fix(info, linebytes);
330 
331  err = register_framebuffer(info);
332  if (err < 0)
333  goto out_unmap_screen;
334 
335  dev_set_drvdata(&op->dev, info);
336 
337  printk(KERN_INFO "%s: bwtwo at %lx:%lx\n",
338  dp->full_name, par->which_io, info->fix.smem_start);
339 
340  return 0;
341 
342 out_unmap_screen:
343  of_iounmap(&op->resource[0], info->screen_base, info->fix.smem_len);
344 
345 out_unmap_regs:
346  of_iounmap(&op->resource[0], par->regs, sizeof(struct bw2_regs));
347 
348 out_release_fb:
349  framebuffer_release(info);
350 
351 out_err:
352  return err;
353 }
354 
355 static int __devexit bw2_remove(struct platform_device *op)
356 {
357  struct fb_info *info = dev_get_drvdata(&op->dev);
358  struct bw2_par *par = info->par;
359 
360  unregister_framebuffer(info);
361 
362  of_iounmap(&op->resource[0], par->regs, sizeof(struct bw2_regs));
363  of_iounmap(&op->resource[0], info->screen_base, info->fix.smem_len);
364 
365  framebuffer_release(info);
366 
367  dev_set_drvdata(&op->dev, NULL);
368 
369  return 0;
370 }
371 
372 static const struct of_device_id bw2_match[] = {
373  {
374  .name = "bwtwo",
375  },
376  {},
377 };
378 MODULE_DEVICE_TABLE(of, bw2_match);
379 
380 static struct platform_driver bw2_driver = {
381  .driver = {
382  .name = "bw2",
383  .owner = THIS_MODULE,
384  .of_match_table = bw2_match,
385  },
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 platform_driver_register(&bw2_driver);
396 }
397 
398 static void __exit bw2_exit(void)
399 {
400  platform_driver_unregister(&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 <[email protected]>");
408 MODULE_VERSION("2.0");
409 MODULE_LICENSE("GPL");
Generated on Thu Jan 10 2013 14:39:48 for Linux Kernel by   doxygen 1.8.2