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gxfb_core.c
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1 /*
2  * Geode GX framebuffer driver.
3  *
4  * Copyright (C) 2006 Arcom Control Systems Ltd.
5  *
6  * This program is free software; you can redistribute it and/or modify it
7  * under the terms of the GNU General Public License as published by the
8  * Free Software Foundation; either version 2 of the License, or (at your
9  * option) any later version.
10  *
11  *
12  * This driver assumes that the BIOS has created a virtual PCI device header
13  * for the video device. The PCI header is assumed to contain the following
14  * BARs:
15  *
16  * BAR0 - framebuffer memory
17  * BAR1 - graphics processor registers
18  * BAR2 - display controller registers
19  * BAR3 - video processor and flat panel control registers.
20  *
21  * 16 MiB of framebuffer memory is assumed to be available.
22  */
23 #include <linux/module.h>
24 #include <linux/kernel.h>
25 #include <linux/errno.h>
26 #include <linux/string.h>
27 #include <linux/mm.h>
28 #include <linux/delay.h>
29 #include <linux/fb.h>
30 #include <linux/console.h>
31 #include <linux/suspend.h>
32 #include <linux/init.h>
33 #include <linux/pci.h>
34 #include <linux/cs5535.h>
35 
36 #include "gxfb.h"
37 
38 static char *mode_option;
39 static int vram;
40 static int vt_switch;
41 
42 /* Modes relevant to the GX (taken from modedb.c) */
43 static struct fb_videomode gx_modedb[] __devinitdata = {
44  /* 640x480-60 VESA */
45  { NULL, 60, 640, 480, 39682, 48, 16, 33, 10, 96, 2,
47  /* 640x480-75 VESA */
48  { NULL, 75, 640, 480, 31746, 120, 16, 16, 01, 64, 3,
50  /* 640x480-85 VESA */
51  { NULL, 85, 640, 480, 27777, 80, 56, 25, 01, 56, 3,
53  /* 800x600-60 VESA */
54  { NULL, 60, 800, 600, 25000, 88, 40, 23, 01, 128, 4,
57  /* 800x600-75 VESA */
58  { NULL, 75, 800, 600, 20202, 160, 16, 21, 01, 80, 3,
61  /* 800x600-85 VESA */
62  { NULL, 85, 800, 600, 17761, 152, 32, 27, 01, 64, 3,
65  /* 1024x768-60 VESA */
66  { NULL, 60, 1024, 768, 15384, 160, 24, 29, 3, 136, 6,
68  /* 1024x768-75 VESA */
69  { NULL, 75, 1024, 768, 12690, 176, 16, 28, 1, 96, 3,
72  /* 1024x768-85 VESA */
73  { NULL, 85, 1024, 768, 10582, 208, 48, 36, 1, 96, 3,
76  /* 1280x960-60 VESA */
77  { NULL, 60, 1280, 960, 9259, 312, 96, 36, 1, 112, 3,
80  /* 1280x960-85 VESA */
81  { NULL, 85, 1280, 960, 6734, 224, 64, 47, 1, 160, 3,
84  /* 1280x1024-60 VESA */
85  { NULL, 60, 1280, 1024, 9259, 248, 48, 38, 1, 112, 3,
88  /* 1280x1024-75 VESA */
89  { NULL, 75, 1280, 1024, 7407, 248, 16, 38, 1, 144, 3,
92  /* 1280x1024-85 VESA */
93  { NULL, 85, 1280, 1024, 6349, 224, 64, 44, 1, 160, 3,
96  /* 1600x1200-60 VESA */
97  { NULL, 60, 1600, 1200, 6172, 304, 64, 46, 1, 192, 3,
100  /* 1600x1200-75 VESA */
101  { NULL, 75, 1600, 1200, 4938, 304, 64, 46, 1, 192, 3,
104  /* 1600x1200-85 VESA */
105  { NULL, 85, 1600, 1200, 4357, 304, 64, 46, 1, 192, 3,
108 };
109 
110 #ifdef CONFIG_OLPC
111 #include <asm/olpc.h>
112 
113 static struct fb_videomode gx_dcon_modedb[] __devinitdata = {
114  /* The only mode the DCON has is 1200x900 */
115  { NULL, 50, 1200, 900, 17460, 24, 8, 4, 5, 8, 3,
118 };
119 
120 static void __devinit get_modedb(struct fb_videomode **modedb,
121  unsigned int *size)
122 {
123  if (olpc_has_dcon()) {
124  *modedb = (struct fb_videomode *) gx_dcon_modedb;
125  *size = ARRAY_SIZE(gx_dcon_modedb);
126  } else {
127  *modedb = (struct fb_videomode *) gx_modedb;
128  *size = ARRAY_SIZE(gx_modedb);
129  }
130 }
131 
132 #else
133 static void __devinit get_modedb(struct fb_videomode **modedb,
134  unsigned int *size)
135 {
136  *modedb = (struct fb_videomode *) gx_modedb;
137  *size = ARRAY_SIZE(gx_modedb);
138 }
139 #endif
140 
141 static int gxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
142 {
143  if (var->xres > 1600 || var->yres > 1200)
144  return -EINVAL;
145  if ((var->xres > 1280 || var->yres > 1024) && var->bits_per_pixel > 16)
146  return -EINVAL;
147 
148  if (var->bits_per_pixel == 32) {
149  var->red.offset = 16; var->red.length = 8;
150  var->green.offset = 8; var->green.length = 8;
151  var->blue.offset = 0; var->blue.length = 8;
152  } else if (var->bits_per_pixel == 16) {
153  var->red.offset = 11; var->red.length = 5;
154  var->green.offset = 5; var->green.length = 6;
155  var->blue.offset = 0; var->blue.length = 5;
156  } else if (var->bits_per_pixel == 8) {
157  var->red.offset = 0; var->red.length = 8;
158  var->green.offset = 0; var->green.length = 8;
159  var->blue.offset = 0; var->blue.length = 8;
160  } else
161  return -EINVAL;
162  var->transp.offset = 0; var->transp.length = 0;
163 
164  /* Enough video memory? */
165  if (gx_line_delta(var->xres, var->bits_per_pixel) * var->yres > info->fix.smem_len)
166  return -EINVAL;
167 
168  /* FIXME: Check timing parameters here? */
169 
170  return 0;
171 }
172 
173 static int gxfb_set_par(struct fb_info *info)
174 {
175  if (info->var.bits_per_pixel > 8)
176  info->fix.visual = FB_VISUAL_TRUECOLOR;
177  else
178  info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
179 
180  info->fix.line_length = gx_line_delta(info->var.xres, info->var.bits_per_pixel);
181 
182  gx_set_mode(info);
183 
184  return 0;
185 }
186 
187 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
188 {
189  chan &= 0xffff;
190  chan >>= 16 - bf->length;
191  return chan << bf->offset;
192 }
193 
194 static int gxfb_setcolreg(unsigned regno, unsigned red, unsigned green,
195  unsigned blue, unsigned transp,
196  struct fb_info *info)
197 {
198  if (info->var.grayscale) {
199  /* grayscale = 0.30*R + 0.59*G + 0.11*B */
200  red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
201  }
202 
203  /* Truecolor has hardware independent palette */
204  if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
205  u32 *pal = info->pseudo_palette;
206  u32 v;
207 
208  if (regno >= 16)
209  return -EINVAL;
210 
211  v = chan_to_field(red, &info->var.red);
212  v |= chan_to_field(green, &info->var.green);
213  v |= chan_to_field(blue, &info->var.blue);
214 
215  pal[regno] = v;
216  } else {
217  if (regno >= 256)
218  return -EINVAL;
219 
220  gx_set_hw_palette_reg(info, regno, red, green, blue);
221  }
222 
223  return 0;
224 }
225 
226 static int gxfb_blank(int blank_mode, struct fb_info *info)
227 {
228  return gx_blank_display(info, blank_mode);
229 }
230 
231 static int __devinit gxfb_map_video_memory(struct fb_info *info,
232  struct pci_dev *dev)
233 {
234  struct gxfb_par *par = info->par;
235  int ret;
236 
237  ret = pci_enable_device(dev);
238  if (ret < 0)
239  return ret;
240 
241  ret = pci_request_region(dev, 3, "gxfb (video processor)");
242  if (ret < 0)
243  return ret;
244  par->vid_regs = pci_ioremap_bar(dev, 3);
245  if (!par->vid_regs)
246  return -ENOMEM;
247 
248  ret = pci_request_region(dev, 2, "gxfb (display controller)");
249  if (ret < 0)
250  return ret;
251  par->dc_regs = pci_ioremap_bar(dev, 2);
252  if (!par->dc_regs)
253  return -ENOMEM;
254 
255  ret = pci_request_region(dev, 1, "gxfb (graphics processor)");
256  if (ret < 0)
257  return ret;
258  par->gp_regs = pci_ioremap_bar(dev, 1);
259 
260  if (!par->gp_regs)
261  return -ENOMEM;
262 
263  ret = pci_request_region(dev, 0, "gxfb (framebuffer)");
264  if (ret < 0)
265  return ret;
266 
267  info->fix.smem_start = pci_resource_start(dev, 0);
268  info->fix.smem_len = vram ? vram : gx_frame_buffer_size();
269  info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
270  if (!info->screen_base)
271  return -ENOMEM;
272 
273  /* Set the 16MiB aligned base address of the graphics memory region
274  * in the display controller */
275 
276  write_dc(par, DC_GLIU0_MEM_OFFSET, info->fix.smem_start & 0xFF000000);
277 
278  dev_info(&dev->dev, "%d KiB of video memory at 0x%lx\n",
279  info->fix.smem_len / 1024, info->fix.smem_start);
280 
281  return 0;
282 }
283 
284 static struct fb_ops gxfb_ops = {
285  .owner = THIS_MODULE,
286  .fb_check_var = gxfb_check_var,
287  .fb_set_par = gxfb_set_par,
288  .fb_setcolreg = gxfb_setcolreg,
289  .fb_blank = gxfb_blank,
290  /* No HW acceleration for now. */
291  .fb_fillrect = cfb_fillrect,
292  .fb_copyarea = cfb_copyarea,
293  .fb_imageblit = cfb_imageblit,
294 };
295 
296 static struct fb_info *__devinit gxfb_init_fbinfo(struct device *dev)
297 {
298  struct gxfb_par *par;
299  struct fb_info *info;
300 
301  /* Alloc enough space for the pseudo palette. */
302  info = framebuffer_alloc(sizeof(struct gxfb_par) + sizeof(u32) * 16,
303  dev);
304  if (!info)
305  return NULL;
306 
307  par = info->par;
308 
309  strcpy(info->fix.id, "Geode GX");
310 
311  info->fix.type = FB_TYPE_PACKED_PIXELS;
312  info->fix.type_aux = 0;
313  info->fix.xpanstep = 0;
314  info->fix.ypanstep = 0;
315  info->fix.ywrapstep = 0;
316  info->fix.accel = FB_ACCEL_NONE;
317 
318  info->var.nonstd = 0;
319  info->var.activate = FB_ACTIVATE_NOW;
320  info->var.height = -1;
321  info->var.width = -1;
322  info->var.accel_flags = 0;
323  info->var.vmode = FB_VMODE_NONINTERLACED;
324 
325  info->fbops = &gxfb_ops;
326  info->flags = FBINFO_DEFAULT;
327  info->node = -1;
328 
329  info->pseudo_palette = (void *)par + sizeof(struct gxfb_par);
330 
331  info->var.grayscale = 0;
332 
333  if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
334  framebuffer_release(info);
335  return NULL;
336  }
337 
338  return info;
339 }
340 
341 #ifdef CONFIG_PM
342 static int gxfb_suspend(struct pci_dev *pdev, pm_message_t state)
343 {
344  struct fb_info *info = pci_get_drvdata(pdev);
345 
346  if (state.event == PM_EVENT_SUSPEND) {
347  console_lock();
348  gx_powerdown(info);
349  fb_set_suspend(info, 1);
350  console_unlock();
351  }
352 
353  /* there's no point in setting PCI states; we emulate PCI, so
354  * we don't end up getting power savings anyways */
355 
356  return 0;
357 }
358 
359 static int gxfb_resume(struct pci_dev *pdev)
360 {
361  struct fb_info *info = pci_get_drvdata(pdev);
362  int ret;
363 
364  console_lock();
365  ret = gx_powerup(info);
366  if (ret) {
367  printk(KERN_ERR "gxfb: power up failed!\n");
368  return ret;
369  }
370 
371  fb_set_suspend(info, 0);
372  console_unlock();
373  return 0;
374 }
375 #endif
376 
377 static int __devinit gxfb_probe(struct pci_dev *pdev,
378  const struct pci_device_id *id)
379 {
380  struct gxfb_par *par;
381  struct fb_info *info;
382  int ret;
383  unsigned long val;
384 
385  struct fb_videomode *modedb_ptr;
386  unsigned int modedb_size;
387 
388  info = gxfb_init_fbinfo(&pdev->dev);
389  if (!info)
390  return -ENOMEM;
391  par = info->par;
392 
393  if ((ret = gxfb_map_video_memory(info, pdev)) < 0) {
394  dev_err(&pdev->dev, "failed to map frame buffer or controller registers\n");
395  goto err;
396  }
397 
398  /* Figure out if this is a TFT or CRT part */
399 
400  rdmsrl(MSR_GX_GLD_MSR_CONFIG, val);
401 
402  if ((val & MSR_GX_GLD_MSR_CONFIG_FP) == MSR_GX_GLD_MSR_CONFIG_FP)
403  par->enable_crt = 0;
404  else
405  par->enable_crt = 1;
406 
407  get_modedb(&modedb_ptr, &modedb_size);
408  ret = fb_find_mode(&info->var, info, mode_option,
409  modedb_ptr, modedb_size, NULL, 16);
410  if (ret == 0 || ret == 4) {
411  dev_err(&pdev->dev, "could not find valid video mode\n");
412  ret = -EINVAL;
413  goto err;
414  }
415 
416 
417  /* Clear the frame buffer of garbage. */
418  memset_io(info->screen_base, 0, info->fix.smem_len);
419 
420  gxfb_check_var(&info->var, info);
421  gxfb_set_par(info);
422 
423  pm_set_vt_switch(vt_switch);
424 
425  if (register_framebuffer(info) < 0) {
426  ret = -EINVAL;
427  goto err;
428  }
429  pci_set_drvdata(pdev, info);
430  printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node, info->fix.id);
431  return 0;
432 
433  err:
434  if (info->screen_base) {
435  iounmap(info->screen_base);
436  pci_release_region(pdev, 0);
437  }
438  if (par->vid_regs) {
439  iounmap(par->vid_regs);
440  pci_release_region(pdev, 3);
441  }
442  if (par->dc_regs) {
443  iounmap(par->dc_regs);
444  pci_release_region(pdev, 2);
445  }
446  if (par->gp_regs) {
447  iounmap(par->gp_regs);
448  pci_release_region(pdev, 1);
449  }
450 
451  if (info) {
452  fb_dealloc_cmap(&info->cmap);
453  framebuffer_release(info);
454  }
455  return ret;
456 }
457 
458 static void __devexit gxfb_remove(struct pci_dev *pdev)
459 {
460  struct fb_info *info = pci_get_drvdata(pdev);
461  struct gxfb_par *par = info->par;
462 
464 
465  iounmap((void __iomem *)info->screen_base);
466  pci_release_region(pdev, 0);
467 
468  iounmap(par->vid_regs);
469  pci_release_region(pdev, 3);
470 
471  iounmap(par->dc_regs);
472  pci_release_region(pdev, 2);
473 
474  iounmap(par->gp_regs);
475  pci_release_region(pdev, 1);
476 
477  fb_dealloc_cmap(&info->cmap);
478  pci_set_drvdata(pdev, NULL);
479 
480  framebuffer_release(info);
481 }
482 
483 static struct pci_device_id gxfb_id_table[] = {
485  { 0, }
486 };
487 
488 MODULE_DEVICE_TABLE(pci, gxfb_id_table);
489 
490 static struct pci_driver gxfb_driver = {
491  .name = "gxfb",
492  .id_table = gxfb_id_table,
493  .probe = gxfb_probe,
494  .remove = gxfb_remove,
495 #ifdef CONFIG_PM
496  .suspend = gxfb_suspend,
497  .resume = gxfb_resume,
498 #endif
499 };
500 
501 #ifndef MODULE
502 static int __init gxfb_setup(char *options)
503 {
504 
505  char *opt;
506 
507  if (!options || !*options)
508  return 0;
509 
510  while ((opt = strsep(&options, ",")) != NULL) {
511  if (!*opt)
512  continue;
513 
514  mode_option = opt;
515  }
516 
517  return 0;
518 }
519 #endif
520 
521 static int __init gxfb_init(void)
522 {
523 #ifndef MODULE
524  char *option = NULL;
525 
526  if (fb_get_options("gxfb", &option))
527  return -ENODEV;
528 
529  gxfb_setup(option);
530 #endif
531  return pci_register_driver(&gxfb_driver);
532 }
533 
534 static void __exit gxfb_cleanup(void)
535 {
536  pci_unregister_driver(&gxfb_driver);
537 }
538 
539 module_init(gxfb_init);
540 module_exit(gxfb_cleanup);
541 
542 module_param(mode_option, charp, 0);
543 MODULE_PARM_DESC(mode_option, "video mode (<x>x<y>[-<bpp>][@<refr>])");
544 
545 module_param(vram, int, 0);
546 MODULE_PARM_DESC(vram, "video memory size");
547 
548 module_param(vt_switch, int, 0);
549 MODULE_PARM_DESC(vt_switch, "enable VT switch during suspend/resume");
550 
551 MODULE_DESCRIPTION("Framebuffer driver for the AMD Geode GX");
552 MODULE_LICENSE("GPL");