Linux kernel & device driver programming

Cross-Referenced Linux and Device Driver Code

[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ]
Version: [ 2.6.11.8 ] [ 2.6.25 ] [ 2.6.25.8 ] [ 2.6.31.13 ] Architecture: [ i386 ]
  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/slab.h>
 29 #include <linux/delay.h>
 30 #include <linux/fb.h>
 31 #include <linux/console.h>
 32 #include <linux/suspend.h>
 33 #include <linux/init.h>
 34 #include <linux/pci.h>
 35 #include <asm/geode.h>
 36 
 37 #include "gxfb.h"
 38 
 39 static char *mode_option;
 40 static int vram;
 41 static int vt_switch;
 42 
 43 /* Modes relevant to the GX (taken from modedb.c) */
 44 static struct fb_videomode gx_modedb[] __initdata = {
 45         /* 640x480-60 VESA */
 46         { NULL, 60, 640, 480, 39682,  48, 16, 33, 10, 96, 2,
 47           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 48         /* 640x480-75 VESA */
 49         { NULL, 75, 640, 480, 31746, 120, 16, 16, 01, 64, 3,
 50           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 51         /* 640x480-85 VESA */
 52         { NULL, 85, 640, 480, 27777, 80, 56, 25, 01, 56, 3,
 53           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 54         /* 800x600-60 VESA */
 55         { NULL, 60, 800, 600, 25000, 88, 40, 23, 01, 128, 4,
 56           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 57           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 58         /* 800x600-75 VESA */
 59         { NULL, 75, 800, 600, 20202, 160, 16, 21, 01, 80, 3,
 60           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 61           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 62         /* 800x600-85 VESA */
 63         { NULL, 85, 800, 600, 17761, 152, 32, 27, 01, 64, 3,
 64           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 65           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 66         /* 1024x768-60 VESA */
 67         { NULL, 60, 1024, 768, 15384, 160, 24, 29, 3, 136, 6,
 68           0, FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 69         /* 1024x768-75 VESA */
 70         { NULL, 75, 1024, 768, 12690, 176, 16, 28, 1, 96, 3,
 71           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 72           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 73         /* 1024x768-85 VESA */
 74         { NULL, 85, 1024, 768, 10582, 208, 48, 36, 1, 96, 3,
 75           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 76           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 77         /* 1280x960-60 VESA */
 78         { NULL, 60, 1280, 960, 9259, 312, 96, 36, 1, 112, 3,
 79           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 80           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 81         /* 1280x960-85 VESA */
 82         { NULL, 85, 1280, 960, 6734, 224, 64, 47, 1, 160, 3,
 83           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 84           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 85         /* 1280x1024-60 VESA */
 86         { NULL, 60, 1280, 1024, 9259, 248, 48, 38, 1, 112, 3,
 87           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 88           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 89         /* 1280x1024-75 VESA */
 90         { NULL, 75, 1280, 1024, 7407, 248, 16, 38, 1, 144, 3,
 91           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 92           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 93         /* 1280x1024-85 VESA */
 94         { NULL, 85, 1280, 1024, 6349, 224, 64, 44, 1, 160, 3,
 95           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 96           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
 97         /* 1600x1200-60 VESA */
 98         { NULL, 60, 1600, 1200, 6172, 304, 64, 46, 1, 192, 3,
 99           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
100           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
101         /* 1600x1200-75 VESA */
102         { NULL, 75, 1600, 1200, 4938, 304, 64, 46, 1, 192, 3,
103           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
104           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
105         /* 1600x1200-85 VESA */
106         { NULL, 85, 1600, 1200, 4357, 304, 64, 46, 1, 192, 3,
107           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
108           FB_VMODE_NONINTERLACED, FB_MODE_IS_VESA },
109 };
110 
111 #ifdef CONFIG_OLPC
112 #include <asm/olpc.h>
113 
114 static struct fb_videomode gx_dcon_modedb[] __initdata = {
115         /* The only mode the DCON has is 1200x900 */
116         { NULL, 50, 1200, 900, 17460, 24, 8, 4, 5, 8, 3,
117           FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
118           FB_VMODE_NONINTERLACED, 0 }
119 };
120 
121 static void __init get_modedb(struct fb_videomode **modedb, 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 __init get_modedb(struct fb_videomode **modedb, unsigned int *size)
134 {
135         *modedb = (struct fb_videomode *) gx_modedb;
136         *size = ARRAY_SIZE(gx_modedb);
137 }
138 #endif
139 
140 static int gxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
141 {
142         if (var->xres > 1600 || var->yres > 1200)
143                 return -EINVAL;
144         if ((var->xres > 1280 || var->yres > 1024) && var->bits_per_pixel > 16)
145                 return -EINVAL;
146 
147         if (var->bits_per_pixel == 32) {
148                 var->red.offset   = 16; var->red.length   = 8;
149                 var->green.offset =  8; var->green.length = 8;
150                 var->blue.offset  =  0; var->blue.length  = 8;
151         } else if (var->bits_per_pixel == 16) {
152                 var->red.offset   = 11; var->red.length   = 5;
153                 var->green.offset =  5; var->green.length = 6;
154                 var->blue.offset  =  0; var->blue.length  = 5;
155         } else if (var->bits_per_pixel == 8) {
156                 var->red.offset   = 0; var->red.length   = 8;
157                 var->green.offset = 0; var->green.length = 8;
158                 var->blue.offset  = 0; var->blue.length  = 8;
159         } else
160                 return -EINVAL;
161         var->transp.offset = 0; var->transp.length = 0;
162 
163         /* Enough video memory? */
164         if (gx_line_delta(var->xres, var->bits_per_pixel) * var->yres > info->fix.smem_len)
165                 return -EINVAL;
166 
167         /* FIXME: Check timing parameters here? */
168 
169         return 0;
170 }
171 
172 static int gxfb_set_par(struct fb_info *info)
173 {
174         if (info->var.bits_per_pixel > 8)
175                 info->fix.visual = FB_VISUAL_TRUECOLOR;
176         else
177                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
178 
179         info->fix.line_length = gx_line_delta(info->var.xres, info->var.bits_per_pixel);
180 
181         gx_set_mode(info);
182 
183         return 0;
184 }
185 
186 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
187 {
188         chan &= 0xffff;
189         chan >>= 16 - bf->length;
190         return chan << bf->offset;
191 }
192 
193 static int gxfb_setcolreg(unsigned regno, unsigned red, unsigned green,
194                            unsigned blue, unsigned transp,
195                            struct fb_info *info)
196 {
197         if (info->var.grayscale) {
198                 /* grayscale = 0.30*R + 0.59*G + 0.11*B */
199                 red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
200         }
201 
202         /* Truecolor has hardware independent palette */
203         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
204                 u32 *pal = info->pseudo_palette;
205                 u32 v;
206 
207                 if (regno >= 16)
208                         return -EINVAL;
209 
210                 v  = chan_to_field(red, &info->var.red);
211                 v |= chan_to_field(green, &info->var.green);
212                 v |= chan_to_field(blue, &info->var.blue);
213 
214                 pal[regno] = v;
215         } else {
216                 if (regno >= 256)
217                         return -EINVAL;
218 
219                 gx_set_hw_palette_reg(info, regno, red, green, blue);
220         }
221 
222         return 0;
223 }
224 
225 static int gxfb_blank(int blank_mode, struct fb_info *info)
226 {
227         return gx_blank_display(info, blank_mode);
228 }
229 
230 static int __init gxfb_map_video_memory(struct fb_info *info, struct pci_dev *dev)
231 {
232         struct gxfb_par *par = info->par;
233         int ret;
234 
235         ret = pci_enable_device(dev);
236         if (ret < 0)
237                 return ret;
238 
239         ret = pci_request_region(dev, 3, "gxfb (video processor)");
240         if (ret < 0)
241                 return ret;
242         par->vid_regs = pci_ioremap_bar(dev, 3);
243         if (!par->vid_regs)
244                 return -ENOMEM;
245 
246         ret = pci_request_region(dev, 2, "gxfb (display controller)");
247         if (ret < 0)
248                 return ret;
249         par->dc_regs = pci_ioremap_bar(dev, 2);
250         if (!par->dc_regs)
251                 return -ENOMEM;
252 
253         ret = pci_request_region(dev, 1, "gxfb (graphics processor)");
254         if (ret < 0)
255                 return ret;
256         par->gp_regs = pci_ioremap_bar(dev, 1);
257 
258         if (!par->gp_regs)
259                 return -ENOMEM;
260 
261         ret = pci_request_region(dev, 0, "gxfb (framebuffer)");
262         if (ret < 0)
263                 return ret;
264 
265         info->fix.smem_start = pci_resource_start(dev, 0);
266         info->fix.smem_len = vram ? vram : gx_frame_buffer_size();
267         info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
268         if (!info->screen_base)
269                 return -ENOMEM;
270 
271         /* Set the 16MiB aligned base address of the graphics memory region
272          * in the display controller */
273 
274         write_dc(par, DC_GLIU0_MEM_OFFSET, info->fix.smem_start & 0xFF000000);
275 
276         dev_info(&dev->dev, "%d KiB of video memory at 0x%lx\n",
277                  info->fix.smem_len / 1024, info->fix.smem_start);
278 
279         return 0;
280 }
281 
282 static struct fb_ops gxfb_ops = {
283         .owner          = THIS_MODULE,
284         .fb_check_var   = gxfb_check_var,
285         .fb_set_par     = gxfb_set_par,
286         .fb_setcolreg   = gxfb_setcolreg,
287         .fb_blank       = gxfb_blank,
288         /* No HW acceleration for now. */
289         .fb_fillrect    = cfb_fillrect,
290         .fb_copyarea    = cfb_copyarea,
291         .fb_imageblit   = cfb_imageblit,
292 };
293 
294 static struct fb_info * __init gxfb_init_fbinfo(struct device *dev)
295 {
296         struct gxfb_par *par;
297         struct fb_info *info;
298 
299         /* Alloc enough space for the pseudo palette. */
300         info = framebuffer_alloc(sizeof(struct gxfb_par) + sizeof(u32) * 16,
301                         dev);
302         if (!info)
303                 return NULL;
304 
305         par = info->par;
306 
307         strcpy(info->fix.id, "Geode GX");
308 
309         info->fix.type          = FB_TYPE_PACKED_PIXELS;
310         info->fix.type_aux      = 0;
311         info->fix.xpanstep      = 0;
312         info->fix.ypanstep      = 0;
313         info->fix.ywrapstep     = 0;
314         info->fix.accel         = FB_ACCEL_NONE;
315 
316         info->var.nonstd        = 0;
317         info->var.activate      = FB_ACTIVATE_NOW;
318         info->var.height        = -1;
319         info->var.width = -1;
320         info->var.accel_flags = 0;
321         info->var.vmode = FB_VMODE_NONINTERLACED;
322 
323         info->fbops             = &gxfb_ops;
324         info->flags             = FBINFO_DEFAULT;
325         info->node              = -1;
326 
327         info->pseudo_palette    = (void *)par + sizeof(struct gxfb_par);
328 
329         info->var.grayscale     = 0;
330 
331         if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
332                 framebuffer_release(info);
333                 return NULL;
334         }
335 
336         return info;
337 }
338 
339 #ifdef CONFIG_PM
340 static int gxfb_suspend(struct pci_dev *pdev, pm_message_t state)
341 {
342         struct fb_info *info = pci_get_drvdata(pdev);
343 
344         if (state.event == PM_EVENT_SUSPEND) {
345                 acquire_console_sem();
346                 gx_powerdown(info);
347                 fb_set_suspend(info, 1);
348                 release_console_sem();
349         }
350 
351         /* there's no point in setting PCI states; we emulate PCI, so
352          * we don't end up getting power savings anyways */
353 
354         return 0;
355 }
356 
357 static int gxfb_resume(struct pci_dev *pdev)
358 {
359         struct fb_info *info = pci_get_drvdata(pdev);
360         int ret;
361 
362         acquire_console_sem();
363         ret = gx_powerup(info);
364         if (ret) {
365                 printk(KERN_ERR "gxfb:  power up failed!\n");
366                 return ret;
367         }
368 
369         fb_set_suspend(info, 0);
370         release_console_sem();
371         return 0;
372 }
373 #endif
374 
375 static int __init gxfb_probe(struct pci_dev *pdev, const struct pci_device_id *id)
376 {
377         struct gxfb_par *par;
378         struct fb_info *info;
379         int ret;
380         unsigned long val;
381 
382         struct fb_videomode *modedb_ptr;
383         unsigned int modedb_size;
384 
385         info = gxfb_init_fbinfo(&pdev->dev);
386         if (!info)
387                 return -ENOMEM;
388         par = info->par;
389 
390         if ((ret = gxfb_map_video_memory(info, pdev)) < 0) {
391                 dev_err(&pdev->dev, "failed to map frame buffer or controller registers\n");
392                 goto err;
393         }
394 
395         /* Figure out if this is a TFT or CRT part */
396 
397         rdmsrl(MSR_GX_GLD_MSR_CONFIG, val);
398 
399         if ((val & MSR_GX_GLD_MSR_CONFIG_FP) == MSR_GX_GLD_MSR_CONFIG_FP)
400                 par->enable_crt = 0;
401         else
402                 par->enable_crt = 1;
403 
404         get_modedb(&modedb_ptr, &modedb_size);
405         ret = fb_find_mode(&info->var, info, mode_option,
406                            modedb_ptr, modedb_size, NULL, 16);
407         if (ret == 0 || ret == 4) {
408                 dev_err(&pdev->dev, "could not find valid video mode\n");
409                 ret = -EINVAL;
410                 goto err;
411         }
412 
413 
414         /* Clear the frame buffer of garbage. */
415         memset_io(info->screen_base, 0, info->fix.smem_len);
416 
417         gxfb_check_var(&info->var, info);
418         gxfb_set_par(info);
419 
420         pm_set_vt_switch(vt_switch);
421 
422         if (register_framebuffer(info) < 0) {
423                 ret = -EINVAL;
424                 goto err;
425         }
426         pci_set_drvdata(pdev, info);
427         printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node, info->fix.id);
428         return 0;
429 
430   err:
431         if (info->screen_base) {
432                 iounmap(info->screen_base);
433                 pci_release_region(pdev, 0);
434         }
435         if (par->vid_regs) {
436                 iounmap(par->vid_regs);
437                 pci_release_region(pdev, 3);
438         }
439         if (par->dc_regs) {
440                 iounmap(par->dc_regs);
441                 pci_release_region(pdev, 2);
442         }
443         if (par->gp_regs) {
444                 iounmap(par->gp_regs);
445                 pci_release_region(pdev, 1);
446         }
447 
448         if (info) {
449                 fb_dealloc_cmap(&info->cmap);
450                 framebuffer_release(info);
451         }
452         return ret;
453 }
454 
455 static void gxfb_remove(struct pci_dev *pdev)
456 {
457         struct fb_info *info = pci_get_drvdata(pdev);
458         struct gxfb_par *par = info->par;
459 
460         unregister_framebuffer(info);
461 
462         iounmap((void __iomem *)info->screen_base);
463         pci_release_region(pdev, 0);
464 
465         iounmap(par->vid_regs);
466         pci_release_region(pdev, 3);
467 
468         iounmap(par->dc_regs);
469         pci_release_region(pdev, 2);
470 
471         iounmap(par->gp_regs);
472         pci_release_region(pdev, 1);
473 
474         fb_dealloc_cmap(&info->cmap);
475         pci_set_drvdata(pdev, NULL);
476 
477         framebuffer_release(info);
478 }
479 
480 static struct pci_device_id gxfb_id_table[] = {
481         { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_GX_VIDEO) },
482         { 0, }
483 };
484 
485 MODULE_DEVICE_TABLE(pci, gxfb_id_table);
486 
487 static struct pci_driver gxfb_driver = {
488         .name           = "gxfb",
489         .id_table       = gxfb_id_table,
490         .probe          = gxfb_probe,
491         .remove         = gxfb_remove,
492 #ifdef CONFIG_PM
493         .suspend        = gxfb_suspend,
494         .resume         = gxfb_resume,
495 #endif
496 };
497 
498 #ifndef MODULE
499 static int __init gxfb_setup(char *options)
500 {
501 
502         char *opt;
503 
504         if (!options || !*options)
505                 return 0;
506 
507         while ((opt = strsep(&options, ",")) != NULL) {
508                 if (!*opt)
509                         continue;
510 
511                 mode_option = opt;
512         }
513 
514         return 0;
515 }
516 #endif
517 
518 static int __init gxfb_init(void)
519 {
520 #ifndef MODULE
521         char *option = NULL;
522 
523         if (fb_get_options("gxfb", &option))
524                 return -ENODEV;
525 
526         gxfb_setup(option);
527 #endif
528         return pci_register_driver(&gxfb_driver);
529 }
530 
531 static void __exit gxfb_cleanup(void)
532 {
533         pci_unregister_driver(&gxfb_driver);
534 }
535 
536 module_init(gxfb_init);
537 module_exit(gxfb_cleanup);
538 
539 module_param(mode_option, charp, 0);
540 MODULE_PARM_DESC(mode_option, "video mode (<x>x<y>[-<bpp>][@<refr>])");
541 
542 module_param(vram, int, 0);
543 MODULE_PARM_DESC(vram, "video memory size");
544 
545 module_param(vt_switch, int, 0);
546 MODULE_PARM_DESC(vt_switch, "enable VT switch during suspend/resume");
547 
548 MODULE_DESCRIPTION("Framebuffer driver for the AMD Geode GX");
549 MODULE_LICENSE("GPL");
550 
  This page was automatically generated by the LXR engine.