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[PATCH] s1d13xxxfb: Fix resource leak
[linux-3.10.git] / drivers / video / s1d13xxxfb.c
1 /* drivers/video/s1d13xxxfb.c
2  *
3  * (c) 2004 Simtec Electronics
4  * (c) 2005 Thibaut VARENE <varenet@parisc-linux.org>
5  *
6  * Driver for Epson S1D13xxx series framebuffer chips
7  *
8  * Adapted from
9  *  linux/drivers/video/skeletonfb.c
10  *  linux/drivers/video/epson1355fb.c
11  *  linux/drivers/video/epson/s1d13xxxfb.c (2.4 driver by Epson)
12  *
13  * Note, currently only tested on S1D13806 with 16bit CRT.
14  * As such, this driver might still contain some hardcoded bits relating to
15  * S1D13806.
16  * Making it work on other S1D13XXX chips should merely be a matter of adding
17  * a few switch()s, some missing glue here and there maybe, and split header
18  * files.
19  *
20  * TODO: - handle dual screen display (CRT and LCD at the same time).
21  *       - check_var(), mode change, etc.
22  *       - PM untested.
23  *       - Accelerated interfaces.
24  *       - Probably not SMP safe :)
25  *
26  * This file is subject to the terms and conditions of the GNU General Public
27  * License. See the file COPYING in the main directory of this archive for
28  * more details.
29  */
30
31 #include <linux/config.h>
32 #include <linux/module.h>
33 #include <linux/platform_device.h>
34 #include <linux/delay.h>
35
36 #include <linux/types.h>
37 #include <linux/errno.h>
38 #include <linux/mm.h>
39 #include <linux/mman.h>
40 #include <linux/fb.h>
41
42 #include <asm/io.h>
43
44 #include <video/s1d13xxxfb.h>
45
46 #define PFX "s1d13xxxfb: "
47
48 #if 0
49 #define dbg(fmt, args...) do { printk(KERN_INFO fmt, ## args); } while(0)
50 #else
51 #define dbg(fmt, args...) do { } while (0)
52 #endif
53
54 /*
55  * Here we define the default struct fb_fix_screeninfo
56  */
57 static struct fb_fix_screeninfo __devinitdata s1d13xxxfb_fix = {
58         .id             = S1D_FBID,
59         .type           = FB_TYPE_PACKED_PIXELS,
60         .visual         = FB_VISUAL_PSEUDOCOLOR,
61         .xpanstep       = 0,
62         .ypanstep       = 1,
63         .ywrapstep      = 0,
64         .accel          = FB_ACCEL_NONE,
65 };
66
67 static inline u8
68 s1d13xxxfb_readreg(struct s1d13xxxfb_par *par, u16 regno)
69 {
70 #if defined(CONFIG_PLAT_M32700UT) || defined(CONFIG_PLAT_OPSPUT) || defined(CONFIG_PLAT_MAPPI3)
71         regno=((regno & 1) ? (regno & ~1L) : (regno + 1));
72 #endif
73         return readb(par->regs + regno);
74 }
75
76 static inline void
77 s1d13xxxfb_writereg(struct s1d13xxxfb_par *par, u16 regno, u8 value)
78 {
79 #if defined(CONFIG_PLAT_M32700UT) || defined(CONFIG_PLAT_OPSPUT) || defined(CONFIG_PLAT_MAPPI3)
80         regno=((regno & 1) ? (regno & ~1L) : (regno + 1));
81 #endif
82         writeb(value, par->regs + regno);
83 }
84
85 static inline void
86 s1d13xxxfb_runinit(struct s1d13xxxfb_par *par,
87                         const struct s1d13xxxfb_regval *initregs,
88                         const unsigned int size)
89 {
90         int i;
91
92         for (i = 0; i < size; i++) {
93                 if ((initregs[i].addr == S1DREG_DELAYOFF) ||
94                                 (initregs[i].addr == S1DREG_DELAYON))
95                         mdelay((int)initregs[i].value);
96                 else {
97                         s1d13xxxfb_writereg(par, initregs[i].addr, initregs[i].value);
98                 }
99         }
100
101         /* make sure the hardware can cope with us */
102         mdelay(1);
103 }
104
105 static inline void
106 lcd_enable(struct s1d13xxxfb_par *par, int enable)
107 {
108         u8 mode = s1d13xxxfb_readreg(par, S1DREG_COM_DISP_MODE);
109
110         if (enable)
111                 mode |= 0x01;
112         else
113                 mode &= ~0x01;
114
115         s1d13xxxfb_writereg(par, S1DREG_COM_DISP_MODE, mode);
116 }
117
118 static inline void
119 crt_enable(struct s1d13xxxfb_par *par, int enable)
120 {
121         u8 mode = s1d13xxxfb_readreg(par, S1DREG_COM_DISP_MODE);
122
123         if (enable)
124                 mode |= 0x02;
125         else
126                 mode &= ~0x02;
127
128         s1d13xxxfb_writereg(par, S1DREG_COM_DISP_MODE, mode);
129 }
130
131 /* framebuffer control routines */
132
133 static inline void
134 s1d13xxxfb_setup_pseudocolour(struct fb_info *info)
135 {
136         info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
137
138         info->var.red.length = 4;
139         info->var.green.length = 4;
140         info->var.blue.length = 4;
141 }
142
143 static inline void
144 s1d13xxxfb_setup_truecolour(struct fb_info *info)
145 {
146         info->fix.visual = FB_VISUAL_TRUECOLOR;
147         info->var.bits_per_pixel = 16;
148
149         info->var.red.length = 5;
150         info->var.red.offset = 11;
151
152         info->var.green.length = 6;
153         info->var.green.offset = 5;
154
155         info->var.blue.length = 5;
156         info->var.blue.offset = 0;
157 }
158
159 /**
160  *      s1d13xxxfb_set_par - Alters the hardware state.
161  *      @info: frame buffer structure
162  *
163  *      Using the fb_var_screeninfo in fb_info we set the depth of the
164  *      framebuffer. This function alters the par AND the
165  *      fb_fix_screeninfo stored in fb_info. It doesn't not alter var in
166  *      fb_info since we are using that data. This means we depend on the
167  *      data in var inside fb_info to be supported by the hardware.
168  *      xxxfb_check_var is always called before xxxfb_set_par to ensure this.
169  *
170  *      XXX TODO: write proper s1d13xxxfb_check_var(), without which that
171  *      function is quite useless.
172  */
173 static int
174 s1d13xxxfb_set_par(struct fb_info *info)
175 {
176         struct s1d13xxxfb_par *s1dfb = info->par;
177         unsigned int val;
178
179         dbg("s1d13xxxfb_set_par: bpp=%d\n", info->var.bits_per_pixel);
180
181         if ((s1dfb->display & 0x01))    /* LCD */
182                 val = s1d13xxxfb_readreg(s1dfb, S1DREG_LCD_DISP_MODE);   /* read colour control */
183         else    /* CRT */
184                 val = s1d13xxxfb_readreg(s1dfb, S1DREG_CRT_DISP_MODE);   /* read colour control */
185
186         val &= ~0x07;
187
188         switch (info->var.bits_per_pixel) {
189                 case 4:
190                         dbg("pseudo colour 4\n");
191                         s1d13xxxfb_setup_pseudocolour(info);
192                         val |= 2;
193                         break;
194                 case 8:
195                         dbg("pseudo colour 8\n");
196                         s1d13xxxfb_setup_pseudocolour(info);
197                         val |= 3;
198                         break;
199                 case 16:
200                         dbg("true colour\n");
201                         s1d13xxxfb_setup_truecolour(info);
202                         val |= 5;
203                         break;
204
205                 default:
206                         dbg("bpp not supported!\n");
207                         return -EINVAL;
208         }
209
210         dbg("writing %02x to display mode register\n", val);
211
212         if ((s1dfb->display & 0x01))    /* LCD */
213                 s1d13xxxfb_writereg(s1dfb, S1DREG_LCD_DISP_MODE, val);
214         else    /* CRT */
215                 s1d13xxxfb_writereg(s1dfb, S1DREG_CRT_DISP_MODE, val);
216
217         info->fix.line_length  = info->var.xres * info->var.bits_per_pixel;
218         info->fix.line_length /= 8;
219
220         dbg("setting line_length to %d\n", info->fix.line_length);
221
222         dbg("done setup\n");
223
224         return 0;
225 }
226
227 /**
228  *      s1d13xxxfb_setcolreg - sets a color register.
229  *      @regno: Which register in the CLUT we are programming
230  *      @red: The red value which can be up to 16 bits wide
231  *      @green: The green value which can be up to 16 bits wide
232  *      @blue:  The blue value which can be up to 16 bits wide.
233  *      @transp: If supported the alpha value which can be up to 16 bits wide.
234  *      @info: frame buffer info structure
235  *
236  *      Returns negative errno on error, or zero on success.
237  */
238 static int
239 s1d13xxxfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
240                         u_int transp, struct fb_info *info)
241 {
242         struct s1d13xxxfb_par *s1dfb = info->par;
243         unsigned int pseudo_val;
244
245         if (regno >= S1D_PALETTE_SIZE)
246                 return -EINVAL;
247
248         dbg("s1d13xxxfb_setcolreg: %d: rgb=%d,%d,%d, tr=%d\n",
249                     regno, red, green, blue, transp);
250
251         if (info->var.grayscale)
252                 red = green = blue = (19595*red + 38470*green + 7471*blue) >> 16;
253
254         switch (info->fix.visual) {
255                 case FB_VISUAL_TRUECOLOR:
256                         if (regno >= 16)
257                                 return -EINVAL;
258
259                         /* deal with creating pseudo-palette entries */
260
261                         pseudo_val  = (red   >> 11) << info->var.red.offset;
262                         pseudo_val |= (green >> 10) << info->var.green.offset;
263                         pseudo_val |= (blue  >> 11) << info->var.blue.offset;
264
265                         dbg("s1d13xxxfb_setcolreg: pseudo %d, val %08x\n",
266                                     regno, pseudo_val);
267
268 #if defined(CONFIG_PLAT_MAPPI)
269                         ((u32 *)info->pseudo_palette)[regno] = cpu_to_le16(pseudo_val);
270 #else
271                         ((u32 *)info->pseudo_palette)[regno] = pseudo_val;
272 #endif
273
274                         break;
275                 case FB_VISUAL_PSEUDOCOLOR:
276                         s1d13xxxfb_writereg(s1dfb, S1DREG_LKUP_ADDR, regno);
277                         s1d13xxxfb_writereg(s1dfb, S1DREG_LKUP_DATA, red);
278                         s1d13xxxfb_writereg(s1dfb, S1DREG_LKUP_DATA, green);
279                         s1d13xxxfb_writereg(s1dfb, S1DREG_LKUP_DATA, blue);
280
281                         break;
282                 default:
283                         return -ENOSYS;
284         }
285
286         dbg("s1d13xxxfb_setcolreg: done\n");
287
288         return 0;
289 }
290
291 /**
292  *      s1d13xxxfb_blank - blanks the display.
293  *      @blank_mode: the blank mode we want.
294  *      @info: frame buffer structure that represents a single frame buffer
295  *
296  *      Blank the screen if blank_mode != 0, else unblank. Return 0 if
297  *      blanking succeeded, != 0 if un-/blanking failed due to e.g. a
298  *      video mode which doesn't support it. Implements VESA suspend
299  *      and powerdown modes on hardware that supports disabling hsync/vsync:
300  *      blank_mode == 2: suspend vsync
301  *      blank_mode == 3: suspend hsync
302  *      blank_mode == 4: powerdown
303  *
304  *      Returns negative errno on error, or zero on success.
305  */
306 static int
307 s1d13xxxfb_blank(int blank_mode, struct fb_info *info)
308 {
309         struct s1d13xxxfb_par *par = info->par;
310
311         dbg("s1d13xxxfb_blank: blank=%d, info=%p\n", blank_mode, info);
312
313         switch (blank_mode) {
314                 case FB_BLANK_UNBLANK:
315                 case FB_BLANK_NORMAL:
316                         if ((par->display & 0x01) != 0)
317                                 lcd_enable(par, 1);
318                         if ((par->display & 0x02) != 0)
319                                 crt_enable(par, 1);
320                         break;
321                 case FB_BLANK_VSYNC_SUSPEND:
322                 case FB_BLANK_HSYNC_SUSPEND:
323                         break;
324                 case FB_BLANK_POWERDOWN:
325                         lcd_enable(par, 0);
326                         crt_enable(par, 0);
327                         break;
328                 default:
329                         return -EINVAL;
330         }
331
332         /* let fbcon do a soft blank for us */
333         return ((blank_mode == FB_BLANK_NORMAL) ? 1 : 0);
334 }
335
336 /**
337  *      s1d13xxxfb_pan_display - Pans the display.
338  *      @var: frame buffer variable screen structure
339  *      @info: frame buffer structure that represents a single frame buffer
340  *
341  *      Pan (or wrap, depending on the `vmode' field) the display using the
342  *      `yoffset' field of the `var' structure (`xoffset'  not yet supported).
343  *      If the values don't fit, return -EINVAL.
344  *
345  *      Returns negative errno on error, or zero on success.
346  */
347 static int
348 s1d13xxxfb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
349 {
350         struct s1d13xxxfb_par *par = info->par;
351         u32 start;
352
353         if (var->xoffset != 0)  /* not yet ... */
354                 return -EINVAL;
355
356         if (var->yoffset + info->var.yres > info->var.yres_virtual)
357                 return -EINVAL;
358
359         start = (info->fix.line_length >> 1) * var->yoffset;
360
361         if ((par->display & 0x01)) {
362                 /* LCD */
363                 s1d13xxxfb_writereg(par, S1DREG_LCD_DISP_START0, (start & 0xff));
364                 s1d13xxxfb_writereg(par, S1DREG_LCD_DISP_START1, ((start >> 8) & 0xff));
365                 s1d13xxxfb_writereg(par, S1DREG_LCD_DISP_START2, ((start >> 16) & 0x0f));
366         } else {
367                 /* CRT */
368                 s1d13xxxfb_writereg(par, S1DREG_CRT_DISP_START0, (start & 0xff));
369                 s1d13xxxfb_writereg(par, S1DREG_CRT_DISP_START1, ((start >> 8) & 0xff));
370                 s1d13xxxfb_writereg(par, S1DREG_CRT_DISP_START2, ((start >> 16) & 0x0f));
371         }
372
373         return 0;
374 }
375
376
377 /* framebuffer information structures */
378
379 static struct fb_ops s1d13xxxfb_fbops = {
380         .owner          = THIS_MODULE,
381         .fb_set_par     = s1d13xxxfb_set_par,
382         .fb_setcolreg   = s1d13xxxfb_setcolreg,
383         .fb_blank       = s1d13xxxfb_blank,
384
385         .fb_pan_display = s1d13xxxfb_pan_display,
386
387         /* to be replaced by any acceleration we can */
388         .fb_fillrect    = cfb_fillrect,
389         .fb_copyarea    = cfb_copyarea,
390         .fb_imageblit   = cfb_imageblit,
391 };
392
393 static int s1d13xxxfb_width_tab[2][4] __devinitdata = {
394         {4, 8, 16, -1},
395         {9, 12, 18, -1},
396 };
397
398 /**
399  *      s1d13xxxfb_fetch_hw_state - Configure the framebuffer according to
400  *      hardware setup.
401  *      @info: frame buffer structure
402  *
403  *      We setup the framebuffer structures according to the current
404  *      hardware setup. On some machines, the BIOS will have filled
405  *      the chip registers with such info, on others, these values will
406  *      have been written in some init procedure. In any case, the
407  *      software values needs to match the hardware ones. This is what
408  *      this function ensures.
409  *
410  *      Note: some of the hardcoded values here might need some love to
411  *      work on various chips, and might need to no longer be hardcoded.
412  */
413 static void __devinit
414 s1d13xxxfb_fetch_hw_state(struct fb_info *info)
415 {
416         struct fb_var_screeninfo *var = &info->var;
417         struct fb_fix_screeninfo *fix = &info->fix;
418         struct s1d13xxxfb_par *par = info->par;
419         u8 panel, display;
420         u16 offset;
421         u32 xres, yres;
422         u32 xres_virtual, yres_virtual;
423         int bpp, lcd_bpp;
424         int is_color, is_dual, is_tft;
425         int lcd_enabled, crt_enabled;
426
427         fix->type = FB_TYPE_PACKED_PIXELS;
428
429         /* general info */
430         par->display = s1d13xxxfb_readreg(par, S1DREG_COM_DISP_MODE);
431         crt_enabled = (par->display & 0x02) != 0;
432         lcd_enabled = (par->display & 0x01) != 0;
433
434         if (lcd_enabled && crt_enabled)
435                 printk(KERN_WARNING PFX "Warning: LCD and CRT detected, using LCD\n");
436
437         if (lcd_enabled)
438                 display = s1d13xxxfb_readreg(par, S1DREG_LCD_DISP_MODE);
439         else    /* CRT */
440                 display = s1d13xxxfb_readreg(par, S1DREG_CRT_DISP_MODE);
441
442         bpp = display & 0x07;
443
444         switch (bpp) {
445                 case 2: /* 4 bpp */
446                 case 3: /* 8 bpp */
447                         var->bits_per_pixel = 8;
448                         var->red.offset = var->green.offset = var->blue.offset = 0;
449                         var->red.length = var->green.length = var->blue.length = 8;
450                         break;
451                 case 5: /* 16 bpp */
452                         s1d13xxxfb_setup_truecolour(info);
453                         break;
454                 default:
455                         dbg("bpp: %i\n", bpp);
456         }
457         fb_alloc_cmap(&info->cmap, 256, 0);
458
459         /* LCD info */
460         panel = s1d13xxxfb_readreg(par, S1DREG_PANEL_TYPE);
461         is_color = (panel & 0x04) != 0;
462         is_dual = (panel & 0x02) != 0;
463         is_tft = (panel & 0x01) != 0;
464         lcd_bpp = s1d13xxxfb_width_tab[is_tft][(panel >> 4) & 3];
465
466         if (lcd_enabled) {
467                 xres = (s1d13xxxfb_readreg(par, S1DREG_LCD_DISP_HWIDTH) + 1) * 8;
468                 yres = (s1d13xxxfb_readreg(par, S1DREG_LCD_DISP_VHEIGHT0) +
469                         ((s1d13xxxfb_readreg(par, S1DREG_LCD_DISP_VHEIGHT1) & 0x03) << 8) + 1);
470
471                 offset = (s1d13xxxfb_readreg(par, S1DREG_LCD_MEM_OFF0) +
472                         ((s1d13xxxfb_readreg(par, S1DREG_LCD_MEM_OFF1) & 0x7) << 8));
473         } else { /* crt */
474                 xres = (s1d13xxxfb_readreg(par, S1DREG_CRT_DISP_HWIDTH) + 1) * 8;
475                 yres = (s1d13xxxfb_readreg(par, S1DREG_CRT_DISP_VHEIGHT0) +
476                         ((s1d13xxxfb_readreg(par, S1DREG_CRT_DISP_VHEIGHT1) & 0x03) << 8) + 1);
477
478                 offset = (s1d13xxxfb_readreg(par, S1DREG_CRT_MEM_OFF0) +
479                         ((s1d13xxxfb_readreg(par, S1DREG_CRT_MEM_OFF1) & 0x7) << 8));
480         }
481         xres_virtual = offset * 16 / var->bits_per_pixel;
482         yres_virtual = fix->smem_len / (offset * 2);
483
484         var->xres               = xres;
485         var->yres               = yres;
486         var->xres_virtual       = xres_virtual;
487         var->yres_virtual       = yres_virtual;
488         var->xoffset            = var->yoffset = 0;
489
490         fix->line_length        = offset * 2;
491
492         var->grayscale          = !is_color;
493
494         var->activate           = FB_ACTIVATE_NOW;
495
496         dbg(PFX "bpp=%d, lcd_bpp=%d, "
497                 "crt_enabled=%d, lcd_enabled=%d\n",
498                 var->bits_per_pixel, lcd_bpp, crt_enabled, lcd_enabled);
499         dbg(PFX "xres=%d, yres=%d, vxres=%d, vyres=%d "
500                 "is_color=%d, is_dual=%d, is_tft=%d\n",
501                 xres, yres, xres_virtual, yres_virtual, is_color, is_dual, is_tft);
502 }
503
504
505 static int
506 s1d13xxxfb_remove(struct platform_device *pdev)
507 {
508         struct fb_info *info = platform_get_drvdata(pdev);
509         struct s1d13xxxfb_par *par = NULL;
510
511         if (info) {
512                 par = info->par;
513                 if (par && par->regs) {
514                         /* disable output & enable powersave */
515                         s1d13xxxfb_writereg(par, S1DREG_COM_DISP_MODE, 0x00);
516                         s1d13xxxfb_writereg(par, S1DREG_PS_CNF, 0x11);
517                         iounmap(par->regs);
518                 }
519
520                 fb_dealloc_cmap(&info->cmap);
521
522                 if (info->screen_base)
523                         iounmap(info->screen_base);
524
525                 framebuffer_release(info);
526         }
527
528         release_mem_region(pdev->resource[0].start,
529                         pdev->resource[0].end - pdev->resource[0].start +1);
530         release_mem_region(pdev->resource[1].start,
531                         pdev->resource[1].end - pdev->resource[1].start +1);
532         return 0;
533 }
534
535 static int __devinit
536 s1d13xxxfb_probe(struct platform_device *pdev)
537 {
538         struct s1d13xxxfb_par *default_par;
539         struct fb_info *info;
540         struct s1d13xxxfb_pdata *pdata = NULL;
541         int ret = 0;
542         u8 revision;
543
544         dbg("probe called: device is %p\n", dev);
545
546         printk(KERN_INFO "Epson S1D13XXX FB Driver\n");
547
548         /* enable platform-dependent hardware glue, if any */
549         if (pdev->dev.platform_data)
550                 pdata = pdev->dev.platform_data;
551
552         if (pdata && pdata->platform_init_video)
553                 pdata->platform_init_video();
554
555
556         if (pdev->num_resources != 2) {
557                 dev_err(&pdev->dev, "invalid num_resources: %i\n",
558                        pdev->num_resources);
559                 ret = -ENODEV;
560                 goto bail;
561         }
562
563         /* resource[0] is VRAM, resource[1] is registers */
564         if (pdev->resource[0].flags != IORESOURCE_MEM
565                         || pdev->resource[1].flags != IORESOURCE_MEM) {
566                 dev_err(&pdev->dev, "invalid resource type\n");
567                 ret = -ENODEV;
568                 goto bail;
569         }
570
571         if (!request_mem_region(pdev->resource[0].start,
572                 pdev->resource[0].end - pdev->resource[0].start +1, "s1d13xxxfb mem")) {
573                 dev_dbg(&pdev->dev, "request_mem_region failed\n");
574                 ret = -EBUSY;
575                 goto bail;
576         }
577
578         if (!request_mem_region(pdev->resource[1].start,
579                 pdev->resource[1].end - pdev->resource[1].start +1, "s1d13xxxfb regs")) {
580                 dev_dbg(&pdev->dev, "request_mem_region failed\n");
581                 ret = -EBUSY;
582                 goto bail;
583         }
584
585         info = framebuffer_alloc(sizeof(struct s1d13xxxfb_par) + sizeof(u32) * 256, &pdev->dev);
586         if (!info) {
587                 ret = -ENOMEM;
588                 goto bail;
589         }
590
591         platform_set_drvdata(pdev, info);
592         default_par = info->par;
593         default_par->regs = ioremap_nocache(pdev->resource[1].start,
594                         pdev->resource[1].end - pdev->resource[1].start +1);
595         if (!default_par->regs) {
596                 printk(KERN_ERR PFX "unable to map registers\n");
597                 ret = -ENOMEM;
598                 goto bail;
599         }
600         info->pseudo_palette = default_par->pseudo_palette;
601
602         info->screen_base = ioremap_nocache(pdev->resource[0].start,
603                         pdev->resource[0].end - pdev->resource[0].start +1);
604
605         if (!info->screen_base) {
606                 printk(KERN_ERR PFX "unable to map framebuffer\n");
607                 ret = -ENOMEM;
608                 goto bail;
609         }
610
611         revision = s1d13xxxfb_readreg(default_par, S1DREG_REV_CODE);
612         if ((revision >> 2) != S1D_CHIP_REV) {
613                 printk(KERN_INFO PFX "chip not found: %i\n", (revision >> 2));
614                 ret = -ENODEV;
615                 goto bail;
616         }
617
618         info->fix = s1d13xxxfb_fix;
619         info->fix.mmio_start = pdev->resource[1].start;
620         info->fix.mmio_len = pdev->resource[1].end - pdev->resource[1].start +1;
621         info->fix.smem_start = pdev->resource[0].start;
622         info->fix.smem_len = pdev->resource[0].end - pdev->resource[0].start +1;
623
624         printk(KERN_INFO PFX "regs mapped at 0x%p, fb %d KiB mapped at 0x%p\n",
625                default_par->regs, info->fix.smem_len / 1024, info->screen_base);
626
627         info->par = default_par;
628         info->fbops = &s1d13xxxfb_fbops;
629         info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
630
631         /* perform "manual" chip initialization, if needed */
632         if (pdata && pdata->initregs)
633                 s1d13xxxfb_runinit(info->par, pdata->initregs, pdata->initregssize);
634
635         s1d13xxxfb_fetch_hw_state(info);
636
637         if (register_framebuffer(info) < 0) {
638                 ret = -EINVAL;
639                 goto bail;
640         }
641
642         printk(KERN_INFO "fb%d: %s frame buffer device\n",
643                info->node, info->fix.id);
644
645         return 0;
646
647 bail:
648         s1d13xxxfb_remove(pdev);
649         return ret;
650
651 }
652
653 #ifdef CONFIG_PM
654 static int s1d13xxxfb_suspend(struct platform_device *dev, pm_message_t state)
655 {
656         struct fb_info *info = platform_get_drvdata(dev);
657         struct s1d13xxxfb_par *s1dfb = info->par;
658         struct s1d13xxxfb_pdata *pdata = NULL;
659
660         /* disable display */
661         lcd_enable(s1dfb, 0);
662         crt_enable(s1dfb, 0);
663
664         if (dev->dev.platform_data)
665                 pdata = dev->dev.platform_data;
666
667 #if 0
668         if (!s1dfb->disp_save)
669                 s1dfb->disp_save = kmalloc(info->fix.smem_len, GFP_KERNEL);
670
671         if (!s1dfb->disp_save) {
672                 printk(KERN_ERR PFX "no memory to save screen");
673                 return -ENOMEM;
674         }
675
676         memcpy_fromio(s1dfb->disp_save, info->screen_base, info->fix.smem_len);
677 #else
678         s1dfb->disp_save = NULL;
679 #endif
680
681         if (!s1dfb->regs_save)
682                 s1dfb->regs_save = kmalloc(info->fix.mmio_len, GFP_KERNEL);
683
684         if (!s1dfb->regs_save) {
685                 printk(KERN_ERR PFX "no memory to save registers");
686                 return -ENOMEM;
687         }
688
689         /* backup all registers */
690         memcpy_fromio(s1dfb->regs_save, s1dfb->regs, info->fix.mmio_len);
691
692         /* now activate power save mode */
693         s1d13xxxfb_writereg(s1dfb, S1DREG_PS_CNF, 0x11);
694
695         if (pdata && pdata->platform_suspend_video)
696                 return pdata->platform_suspend_video();
697         else
698                 return 0;
699 }
700
701 static int s1d13xxxfb_resume(struct platform_device *dev)
702 {
703         struct fb_info *info = platform_get_drvdata(dev);
704         struct s1d13xxxfb_par *s1dfb = info->par;
705         struct s1d13xxxfb_pdata *pdata = NULL;
706
707         /* awaken the chip */
708         s1d13xxxfb_writereg(s1dfb, S1DREG_PS_CNF, 0x10);
709
710         /* do not let go until SDRAM "wakes up" */
711         while ((s1d13xxxfb_readreg(s1dfb, S1DREG_PS_STATUS) & 0x01))
712                 udelay(10);
713
714         if (dev->dev.platform_data)
715                 pdata = dev->dev.platform_data;
716
717         if (s1dfb->regs_save) {
718                 /* will write RO regs, *should* get away with it :) */
719                 memcpy_toio(s1dfb->regs, s1dfb->regs_save, info->fix.mmio_len);
720                 kfree(s1dfb->regs_save);
721         }
722
723         if (s1dfb->disp_save) {
724                 memcpy_toio(info->screen_base, s1dfb->disp_save,
725                                 info->fix.smem_len);
726                 kfree(s1dfb->disp_save);        /* XXX kmalloc()'d when? */
727         }
728
729         if ((s1dfb->display & 0x01) != 0)
730                 lcd_enable(s1dfb, 1);
731         if ((s1dfb->display & 0x02) != 0)
732                 crt_enable(s1dfb, 1);
733
734         if (pdata && pdata->platform_resume_video)
735                 return pdata->platform_resume_video();
736         else
737                 return 0;
738 }
739 #endif /* CONFIG_PM */
740
741 static struct platform_driver s1d13xxxfb_driver = {
742         .probe          = s1d13xxxfb_probe,
743         .remove         = s1d13xxxfb_remove,
744 #ifdef CONFIG_PM
745         .suspend        = s1d13xxxfb_suspend,
746         .resume         = s1d13xxxfb_resume,
747 #endif
748         .driver         = {
749                 .name   = S1D_DEVICENAME,
750         },
751 };
752
753
754 static int __init
755 s1d13xxxfb_init(void)
756 {
757         if (fb_get_options("s1d13xxxfb", NULL))
758                 return -ENODEV;
759
760         return platform_driver_register(&s1d13xxxfb_driver);
761 }
762
763
764 static void __exit
765 s1d13xxxfb_exit(void)
766 {
767         platform_driver_unregister(&s1d13xxxfb_driver);
768 }
769
770 module_init(s1d13xxxfb_init);
771 module_exit(s1d13xxxfb_exit);
772
773
774 MODULE_LICENSE("GPL");
775 MODULE_DESCRIPTION("Framebuffer driver for S1D13xxx devices");
776 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>, Thibaut VARENE <varenet@parisc-linux.org>");