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ep93xx-fb.c
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1 /*
2  * linux/drivers/video/ep93xx-fb.c
3  *
4  * Framebuffer support for the EP93xx series.
5  *
6  * Copyright (C) 2007 Bluewater Systems Ltd
7  * Author: Ryan Mallon
8  *
9  * Copyright (c) 2009 H Hartley Sweeten <[email protected]>
10  *
11  * Based on the Cirrus Logic ep93xxfb driver, and various other ep93xxfb
12  * drivers.
13  *
14  * This program is free software; you can redistribute it and/or modify
15  * it under the terms of the GNU General Public License version 2 as
16  * published by the Free Software Foundation.
17  *
18  */
19 
20 #include <linux/platform_device.h>
21 #include <linux/module.h>
22 #include <linux/dma-mapping.h>
23 #include <linux/slab.h>
24 #include <linux/clk.h>
25 #include <linux/fb.h>
26 
27 #include <linux/platform_data/video-ep93xx.h>
28 
29 /* Vertical Frame Timing Registers */
30 #define EP93XXFB_VLINES_TOTAL 0x0000 /* SW locked */
31 #define EP93XXFB_VSYNC 0x0004 /* SW locked */
32 #define EP93XXFB_VACTIVE 0x0008 /* SW locked */
33 #define EP93XXFB_VBLANK 0x0228 /* SW locked */
34 #define EP93XXFB_VCLK 0x000c /* SW locked */
35 
36 /* Horizontal Frame Timing Registers */
37 #define EP93XXFB_HCLKS_TOTAL 0x0010 /* SW locked */
38 #define EP93XXFB_HSYNC 0x0014 /* SW locked */
39 #define EP93XXFB_HACTIVE 0x0018 /* SW locked */
40 #define EP93XXFB_HBLANK 0x022c /* SW locked */
41 #define EP93XXFB_HCLK 0x001c /* SW locked */
42 
43 /* Frame Buffer Memory Configuration Registers */
44 #define EP93XXFB_SCREEN_PAGE 0x0028
45 #define EP93XXFB_SCREEN_HPAGE 0x002c
46 #define EP93XXFB_SCREEN_LINES 0x0030
47 #define EP93XXFB_LINE_LENGTH 0x0034
48 #define EP93XXFB_VLINE_STEP 0x0038
49 #define EP93XXFB_LINE_CARRY 0x003c /* SW locked */
50 #define EP93XXFB_EOL_OFFSET 0x0230
51 
52 /* Other Video Registers */
53 #define EP93XXFB_BRIGHTNESS 0x0020
54 #define EP93XXFB_ATTRIBS 0x0024 /* SW locked */
55 #define EP93XXFB_SWLOCK 0x007c /* SW locked */
56 #define EP93XXFB_AC_RATE 0x0214
57 #define EP93XXFB_FIFO_LEVEL 0x0234
58 #define EP93XXFB_PIXELMODE 0x0054
59 #define EP93XXFB_PIXELMODE_32BPP (0x7 << 0)
60 #define EP93XXFB_PIXELMODE_24BPP (0x6 << 0)
61 #define EP93XXFB_PIXELMODE_16BPP (0x4 << 0)
62 #define EP93XXFB_PIXELMODE_8BPP (0x2 << 0)
63 #define EP93XXFB_PIXELMODE_SHIFT_1P_24B (0x0 << 3)
64 #define EP93XXFB_PIXELMODE_SHIFT_1P_18B (0x1 << 3)
65 #define EP93XXFB_PIXELMODE_COLOR_LUT (0x0 << 10)
66 #define EP93XXFB_PIXELMODE_COLOR_888 (0x4 << 10)
67 #define EP93XXFB_PIXELMODE_COLOR_555 (0x5 << 10)
68 #define EP93XXFB_PARL_IF_OUT 0x0058
69 #define EP93XXFB_PARL_IF_IN 0x005c
70 
71 /* Blink Control Registers */
72 #define EP93XXFB_BLINK_RATE 0x0040
73 #define EP93XXFB_BLINK_MASK 0x0044
74 #define EP93XXFB_BLINK_PATTRN 0x0048
75 #define EP93XXFB_PATTRN_MASK 0x004c
76 #define EP93XXFB_BKGRND_OFFSET 0x0050
77 
78 /* Hardware Cursor Registers */
79 #define EP93XXFB_CURSOR_ADR_START 0x0060
80 #define EP93XXFB_CURSOR_ADR_RESET 0x0064
81 #define EP93XXFB_CURSOR_SIZE 0x0068
82 #define EP93XXFB_CURSOR_COLOR1 0x006c
83 #define EP93XXFB_CURSOR_COLOR2 0x0070
84 #define EP93XXFB_CURSOR_BLINK_COLOR1 0x021c
85 #define EP93XXFB_CURSOR_BLINK_COLOR2 0x0220
86 #define EP93XXFB_CURSOR_XY_LOC 0x0074
87 #define EP93XXFB_CURSOR_DSCAN_HY_LOC 0x0078
88 #define EP93XXFB_CURSOR_BLINK_RATE_CTRL 0x0224
89 
90 /* LUT Registers */
91 #define EP93XXFB_GRY_SCL_LUTR 0x0080
92 #define EP93XXFB_GRY_SCL_LUTG 0x0280
93 #define EP93XXFB_GRY_SCL_LUTB 0x0300
94 #define EP93XXFB_LUT_SW_CONTROL 0x0218
95 #define EP93XXFB_LUT_SW_CONTROL_SWTCH (1 << 0)
96 #define EP93XXFB_LUT_SW_CONTROL_SSTAT (1 << 1)
97 #define EP93XXFB_COLOR_LUT 0x0400
98 
99 /* Video Signature Registers */
100 #define EP93XXFB_VID_SIG_RSLT_VAL 0x0200
101 #define EP93XXFB_VID_SIG_CTRL 0x0204
102 #define EP93XXFB_VSIG 0x0208
103 #define EP93XXFB_HSIG 0x020c
104 #define EP93XXFB_SIG_CLR_STR 0x0210
105 
106 /* Minimum / Maximum resolutions supported */
107 #define EP93XXFB_MIN_XRES 64
108 #define EP93XXFB_MIN_YRES 64
109 #define EP93XXFB_MAX_XRES 1024
110 #define EP93XXFB_MAX_YRES 768
111 
112 struct ep93xx_fbi {
113  struct ep93xxfb_mach_info *mach_info;
114  struct clk *clk;
115  struct resource *res;
116  void __iomem *mmio_base;
117  unsigned int pseudo_palette[256];
118 };
119 
120 static int check_screenpage_bug = 1;
121 module_param(check_screenpage_bug, int, 0644);
122 MODULE_PARM_DESC(check_screenpage_bug,
123  "Check for bit 27 screen page bug. Default = 1");
124 
125 static inline unsigned int ep93xxfb_readl(struct ep93xx_fbi *fbi,
126  unsigned int off)
127 {
128  return __raw_readl(fbi->mmio_base + off);
129 }
130 
131 static inline void ep93xxfb_writel(struct ep93xx_fbi *fbi,
132  unsigned int val, unsigned int off)
133 {
134  __raw_writel(val, fbi->mmio_base + off);
135 }
136 
137 /*
138  * Write to one of the locked raster registers.
139  */
140 static inline void ep93xxfb_out_locked(struct ep93xx_fbi *fbi,
141  unsigned int val, unsigned int reg)
142 {
143  /*
144  * We don't need a lock or delay here since the raster register
145  * block will remain unlocked until the next access.
146  */
147  ep93xxfb_writel(fbi, 0xaa, EP93XXFB_SWLOCK);
148  ep93xxfb_writel(fbi, val, reg);
149 }
150 
151 static void ep93xxfb_set_video_attribs(struct fb_info *info)
152 {
153  struct ep93xx_fbi *fbi = info->par;
154  unsigned int attribs;
155 
156  attribs = EP93XXFB_ENABLE;
157  attribs |= fbi->mach_info->flags;
158  ep93xxfb_out_locked(fbi, attribs, EP93XXFB_ATTRIBS);
159 }
160 
161 static int ep93xxfb_set_pixelmode(struct fb_info *info)
162 {
163  struct ep93xx_fbi *fbi = info->par;
164  unsigned int val;
165 
166  info->var.transp.offset = 0;
167  info->var.transp.length = 0;
168 
169  switch (info->var.bits_per_pixel) {
170  case 8:
171  val = EP93XXFB_PIXELMODE_8BPP | EP93XXFB_PIXELMODE_COLOR_LUT |
172  EP93XXFB_PIXELMODE_SHIFT_1P_18B;
173 
174  info->var.red.offset = 0;
175  info->var.red.length = 8;
176  info->var.green.offset = 0;
177  info->var.green.length = 8;
178  info->var.blue.offset = 0;
179  info->var.blue.length = 8;
180  info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
181  break;
182 
183  case 16:
184  val = EP93XXFB_PIXELMODE_16BPP | EP93XXFB_PIXELMODE_COLOR_555 |
185  EP93XXFB_PIXELMODE_SHIFT_1P_18B;
186 
187  info->var.red.offset = 11;
188  info->var.red.length = 5;
189  info->var.green.offset = 5;
190  info->var.green.length = 6;
191  info->var.blue.offset = 0;
192  info->var.blue.length = 5;
193  info->fix.visual = FB_VISUAL_TRUECOLOR;
194  break;
195 
196  case 24:
197  val = EP93XXFB_PIXELMODE_24BPP | EP93XXFB_PIXELMODE_COLOR_888 |
198  EP93XXFB_PIXELMODE_SHIFT_1P_24B;
199 
200  info->var.red.offset = 16;
201  info->var.red.length = 8;
202  info->var.green.offset = 8;
203  info->var.green.length = 8;
204  info->var.blue.offset = 0;
205  info->var.blue.length = 8;
206  info->fix.visual = FB_VISUAL_TRUECOLOR;
207  break;
208 
209  case 32:
210  val = EP93XXFB_PIXELMODE_32BPP | EP93XXFB_PIXELMODE_COLOR_888 |
211  EP93XXFB_PIXELMODE_SHIFT_1P_24B;
212 
213  info->var.red.offset = 16;
214  info->var.red.length = 8;
215  info->var.green.offset = 8;
216  info->var.green.length = 8;
217  info->var.blue.offset = 0;
218  info->var.blue.length = 8;
219  info->fix.visual = FB_VISUAL_TRUECOLOR;
220  break;
221 
222  default:
223  return -EINVAL;
224  }
225 
226  ep93xxfb_writel(fbi, val, EP93XXFB_PIXELMODE);
227  return 0;
228 }
229 
230 static void ep93xxfb_set_timing(struct fb_info *info)
231 {
232  struct ep93xx_fbi *fbi = info->par;
233  unsigned int vlines_total, hclks_total, start, stop;
234 
235  vlines_total = info->var.yres + info->var.upper_margin +
236  info->var.lower_margin + info->var.vsync_len - 1;
237 
238  hclks_total = info->var.xres + info->var.left_margin +
239  info->var.right_margin + info->var.hsync_len - 1;
240 
241  ep93xxfb_out_locked(fbi, vlines_total, EP93XXFB_VLINES_TOTAL);
242  ep93xxfb_out_locked(fbi, hclks_total, EP93XXFB_HCLKS_TOTAL);
243 
244  start = vlines_total;
245  stop = vlines_total - info->var.vsync_len;
246  ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VSYNC);
247 
248  start = vlines_total - info->var.vsync_len - info->var.upper_margin;
249  stop = info->var.lower_margin - 1;
250  ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VBLANK);
251  ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VACTIVE);
252 
253  start = vlines_total;
254  stop = vlines_total + 1;
255  ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VCLK);
256 
257  start = hclks_total;
258  stop = hclks_total - info->var.hsync_len;
259  ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HSYNC);
260 
261  start = hclks_total - info->var.hsync_len - info->var.left_margin;
262  stop = info->var.right_margin - 1;
263  ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HBLANK);
264  ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HACTIVE);
265 
266  start = hclks_total;
267  stop = hclks_total;
268  ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HCLK);
269 
270  ep93xxfb_out_locked(fbi, 0x0, EP93XXFB_LINE_CARRY);
271 }
272 
273 static int ep93xxfb_set_par(struct fb_info *info)
274 {
275  struct ep93xx_fbi *fbi = info->par;
276 
277  clk_set_rate(fbi->clk, 1000 * PICOS2KHZ(info->var.pixclock));
278 
279  ep93xxfb_set_timing(info);
280 
281  info->fix.line_length = info->var.xres_virtual *
282  info->var.bits_per_pixel / 8;
283 
284  ep93xxfb_writel(fbi, info->fix.smem_start, EP93XXFB_SCREEN_PAGE);
285  ep93xxfb_writel(fbi, info->var.yres - 1, EP93XXFB_SCREEN_LINES);
286  ep93xxfb_writel(fbi, ((info->var.xres * info->var.bits_per_pixel)
287  / 32) - 1, EP93XXFB_LINE_LENGTH);
288  ep93xxfb_writel(fbi, info->fix.line_length / 4, EP93XXFB_VLINE_STEP);
289  ep93xxfb_set_video_attribs(info);
290  return 0;
291 }
292 
293 static int ep93xxfb_check_var(struct fb_var_screeninfo *var,
294  struct fb_info *info)
295 {
296  int err;
297 
298  err = ep93xxfb_set_pixelmode(info);
299  if (err)
300  return err;
301 
302  var->xres = max_t(unsigned int, var->xres, EP93XXFB_MIN_XRES);
303  var->xres = min_t(unsigned int, var->xres, EP93XXFB_MAX_XRES);
304  var->xres_virtual = max(var->xres_virtual, var->xres);
305 
306  var->yres = max_t(unsigned int, var->yres, EP93XXFB_MIN_YRES);
307  var->yres = min_t(unsigned int, var->yres, EP93XXFB_MAX_YRES);
308  var->yres_virtual = max(var->yres_virtual, var->yres);
309 
310  return 0;
311 }
312 
313 static int ep93xxfb_mmap(struct fb_info *info, struct vm_area_struct *vma)
314 {
315  unsigned int offset = vma->vm_pgoff << PAGE_SHIFT;
316 
317  if (offset < info->fix.smem_len) {
318  return dma_mmap_writecombine(info->dev, vma, info->screen_base,
319  info->fix.smem_start,
320  info->fix.smem_len);
321  }
322 
323  return -EINVAL;
324 }
325 
326 static int ep93xxfb_blank(int blank_mode, struct fb_info *info)
327 {
328  struct ep93xx_fbi *fbi = info->par;
329  unsigned int attribs = ep93xxfb_readl(fbi, EP93XXFB_ATTRIBS);
330 
331  if (blank_mode) {
332  if (fbi->mach_info->blank)
333  fbi->mach_info->blank(blank_mode, info);
334  ep93xxfb_out_locked(fbi, attribs & ~EP93XXFB_ENABLE,
335  EP93XXFB_ATTRIBS);
336  clk_disable(fbi->clk);
337  } else {
338  clk_enable(fbi->clk);
339  ep93xxfb_out_locked(fbi, attribs | EP93XXFB_ENABLE,
340  EP93XXFB_ATTRIBS);
341  if (fbi->mach_info->blank)
342  fbi->mach_info->blank(blank_mode, info);
343  }
344 
345  return 0;
346 }
347 
348 static inline int ep93xxfb_convert_color(int val, int width)
349 {
350  return ((val << width) + 0x7fff - val) >> 16;
351 }
352 
353 static int ep93xxfb_setcolreg(unsigned int regno, unsigned int red,
354  unsigned int green, unsigned int blue,
355  unsigned int transp, struct fb_info *info)
356 {
357  struct ep93xx_fbi *fbi = info->par;
358  unsigned int *pal = info->pseudo_palette;
359  unsigned int ctrl, i, rgb, lut_current, lut_stat;
360 
361  switch (info->fix.visual) {
362  case FB_VISUAL_PSEUDOCOLOR:
363  if (regno > 255)
364  return 1;
365  rgb = ((red & 0xff00) << 8) | (green & 0xff00) |
366  ((blue & 0xff00) >> 8);
367 
368  pal[regno] = rgb;
369  ep93xxfb_writel(fbi, rgb, (EP93XXFB_COLOR_LUT + (regno << 2)));
370  ctrl = ep93xxfb_readl(fbi, EP93XXFB_LUT_SW_CONTROL);
371  lut_stat = !!(ctrl & EP93XXFB_LUT_SW_CONTROL_SSTAT);
372  lut_current = !!(ctrl & EP93XXFB_LUT_SW_CONTROL_SWTCH);
373 
374  if (lut_stat == lut_current) {
375  for (i = 0; i < 256; i++) {
376  ep93xxfb_writel(fbi, pal[i],
377  EP93XXFB_COLOR_LUT + (i << 2));
378  }
379 
380  ep93xxfb_writel(fbi,
381  ctrl ^ EP93XXFB_LUT_SW_CONTROL_SWTCH,
382  EP93XXFB_LUT_SW_CONTROL);
383  }
384  break;
385 
386  case FB_VISUAL_TRUECOLOR:
387  if (regno > 16)
388  return 1;
389 
390  red = ep93xxfb_convert_color(red, info->var.red.length);
391  green = ep93xxfb_convert_color(green, info->var.green.length);
392  blue = ep93xxfb_convert_color(blue, info->var.blue.length);
393  transp = ep93xxfb_convert_color(transp,
394  info->var.transp.length);
395 
396  pal[regno] = (red << info->var.red.offset) |
397  (green << info->var.green.offset) |
398  (blue << info->var.blue.offset) |
399  (transp << info->var.transp.offset);
400  break;
401 
402  default:
403  return 1;
404  }
405 
406  return 0;
407 }
408 
409 static struct fb_ops ep93xxfb_ops = {
410  .owner = THIS_MODULE,
411  .fb_check_var = ep93xxfb_check_var,
412  .fb_set_par = ep93xxfb_set_par,
413  .fb_blank = ep93xxfb_blank,
414  .fb_fillrect = cfb_fillrect,
415  .fb_copyarea = cfb_copyarea,
416  .fb_imageblit = cfb_imageblit,
417  .fb_setcolreg = ep93xxfb_setcolreg,
418  .fb_mmap = ep93xxfb_mmap,
419 };
420 
421 static int __init ep93xxfb_calc_fbsize(struct ep93xxfb_mach_info *mach_info)
422 {
423  int i, fb_size = 0;
424 
425  if (mach_info->num_modes == EP93XXFB_USE_MODEDB) {
426  fb_size = EP93XXFB_MAX_XRES * EP93XXFB_MAX_YRES *
427  mach_info->bpp / 8;
428  } else {
429  for (i = 0; i < mach_info->num_modes; i++) {
430  const struct fb_videomode *mode;
431  int size;
432 
433  mode = &mach_info->modes[i];
434  size = mode->xres * mode->yres * mach_info->bpp / 8;
435  if (size > fb_size)
436  fb_size = size;
437  }
438  }
439 
440  return fb_size;
441 }
442 
443 static int __init ep93xxfb_alloc_videomem(struct fb_info *info)
444 {
445  struct ep93xx_fbi *fbi = info->par;
446  char __iomem *virt_addr;
447  dma_addr_t phys_addr;
448  unsigned int fb_size;
449 
450  fb_size = ep93xxfb_calc_fbsize(fbi->mach_info);
451  virt_addr = dma_alloc_writecombine(info->dev, fb_size,
452  &phys_addr, GFP_KERNEL);
453  if (!virt_addr)
454  return -ENOMEM;
455 
456  /*
457  * There is a bug in the ep93xx framebuffer which causes problems
458  * if bit 27 of the physical address is set.
459  * See: http://marc.info/?l=linux-arm-kernel&m=110061245502000&w=2
460  * There does not seem to be any official errata for this, but I
461  * have confirmed the problem exists on my hardware (ep9315) at
462  * least.
463  */
464  if (check_screenpage_bug && phys_addr & (1 << 27)) {
465  dev_err(info->dev, "ep93xx framebuffer bug. phys addr (0x%x) "
466  "has bit 27 set: cannot init framebuffer\n",
467  phys_addr);
468 
469  dma_free_coherent(info->dev, fb_size, virt_addr, phys_addr);
470  return -ENOMEM;
471  }
472 
473  info->fix.smem_start = phys_addr;
474  info->fix.smem_len = fb_size;
475  info->screen_base = virt_addr;
476 
477  return 0;
478 }
479 
480 static void ep93xxfb_dealloc_videomem(struct fb_info *info)
481 {
482  if (info->screen_base)
483  dma_free_coherent(info->dev, info->fix.smem_len,
484  info->screen_base, info->fix.smem_start);
485 }
486 
487 static int __devinit ep93xxfb_probe(struct platform_device *pdev)
488 {
489  struct ep93xxfb_mach_info *mach_info = pdev->dev.platform_data;
490  struct fb_info *info;
491  struct ep93xx_fbi *fbi;
492  struct resource *res;
493  char *video_mode;
494  int err;
495 
496  if (!mach_info)
497  return -EINVAL;
498 
499  info = framebuffer_alloc(sizeof(struct ep93xx_fbi), &pdev->dev);
500  if (!info)
501  return -ENOMEM;
502 
503  info->dev = &pdev->dev;
504  platform_set_drvdata(pdev, info);
505  fbi = info->par;
506  fbi->mach_info = mach_info;
507 
508  err = fb_alloc_cmap(&info->cmap, 256, 0);
509  if (err)
510  goto failed_cmap;
511 
512  err = ep93xxfb_alloc_videomem(info);
513  if (err)
514  goto failed_videomem;
515 
516  res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
517  if (!res) {
518  err = -ENXIO;
519  goto failed_resource;
520  }
521 
522  /*
523  * FIXME - We don't do a request_mem_region here because we are
524  * sharing the register space with the backlight driver (see
525  * drivers/video/backlight/ep93xx_bl.c) and doing so will cause
526  * the second loaded driver to return -EBUSY.
527  *
528  * NOTE: No locking is required; the backlight does not touch
529  * any of the framebuffer registers.
530  */
531  fbi->res = res;
532  fbi->mmio_base = devm_ioremap(&pdev->dev, res->start,
533  resource_size(res));
534  if (!fbi->mmio_base) {
535  err = -ENXIO;
536  goto failed_resource;
537  }
538 
539  strcpy(info->fix.id, pdev->name);
540  info->fbops = &ep93xxfb_ops;
541  info->fix.type = FB_TYPE_PACKED_PIXELS;
542  info->fix.accel = FB_ACCEL_NONE;
543  info->var.activate = FB_ACTIVATE_NOW;
544  info->var.vmode = FB_VMODE_NONINTERLACED;
545  info->flags = FBINFO_DEFAULT;
546  info->node = -1;
547  info->state = FBINFO_STATE_RUNNING;
548  info->pseudo_palette = &fbi->pseudo_palette;
549 
550  fb_get_options("ep93xx-fb", &video_mode);
551  err = fb_find_mode(&info->var, info, video_mode,
552  fbi->mach_info->modes, fbi->mach_info->num_modes,
553  fbi->mach_info->default_mode, fbi->mach_info->bpp);
554  if (err == 0) {
555  dev_err(info->dev, "No suitable video mode found\n");
556  err = -EINVAL;
557  goto failed_resource;
558  }
559 
560  if (mach_info->setup) {
561  err = mach_info->setup(pdev);
562  if (err)
563  goto failed_resource;
564  }
565 
566  err = ep93xxfb_check_var(&info->var, info);
567  if (err)
568  goto failed_check;
569 
570  fbi->clk = devm_clk_get(&pdev->dev, NULL);
571  if (IS_ERR(fbi->clk)) {
572  err = PTR_ERR(fbi->clk);
573  fbi->clk = NULL;
574  goto failed_check;
575  }
576 
577  ep93xxfb_set_par(info);
578  clk_enable(fbi->clk);
579 
580  err = register_framebuffer(info);
581  if (err)
582  goto failed_check;
583 
584  dev_info(info->dev, "registered. Mode = %dx%d-%d\n",
585  info->var.xres, info->var.yres, info->var.bits_per_pixel);
586  return 0;
587 
588 failed_check:
589  if (fbi->mach_info->teardown)
590  fbi->mach_info->teardown(pdev);
591 failed_resource:
592  ep93xxfb_dealloc_videomem(info);
593 failed_videomem:
594  fb_dealloc_cmap(&info->cmap);
595 failed_cmap:
596  kfree(info);
597  platform_set_drvdata(pdev, NULL);
598 
599  return err;
600 }
601 
602 static int __devexit ep93xxfb_remove(struct platform_device *pdev)
603 {
604  struct fb_info *info = platform_get_drvdata(pdev);
605  struct ep93xx_fbi *fbi = info->par;
606 
607  unregister_framebuffer(info);
608  clk_disable(fbi->clk);
609  ep93xxfb_dealloc_videomem(info);
610  fb_dealloc_cmap(&info->cmap);
611 
612  if (fbi->mach_info->teardown)
613  fbi->mach_info->teardown(pdev);
614 
615  kfree(info);
616  platform_set_drvdata(pdev, NULL);
617 
618  return 0;
619 }
620 
621 static struct platform_driver ep93xxfb_driver = {
622  .probe = ep93xxfb_probe,
623  .remove = __devexit_p(ep93xxfb_remove),
624  .driver = {
625  .name = "ep93xx-fb",
626  .owner = THIS_MODULE,
627  },
628 };
629 
630 static int __devinit ep93xxfb_init(void)
631 {
632  return platform_driver_register(&ep93xxfb_driver);
633 }
634 
635 static void __exit ep93xxfb_exit(void)
636 {
637  platform_driver_unregister(&ep93xxfb_driver);
638 }
639 
640 module_init(ep93xxfb_init);
641 module_exit(ep93xxfb_exit);
642 
643 MODULE_DESCRIPTION("EP93XX Framebuffer Driver");
644 MODULE_ALIAS("platform:ep93xx-fb");
645 MODULE_AUTHOR("Ryan Mallon, "
646  "H Hartley Sweeten <[email protected]");
647 MODULE_LICENSE("GPL");
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