[PATCH] s1d13xxxfb linkage fix
[linux-2.6.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/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         return readb(par->regs + regno);
71 }
72
73 static inline void
74 s1d13xxxfb_writereg(struct s1d13xxxfb_par *par, u16 regno, u8 value)
75 {
76         writeb(value, par->regs + regno);
77 }
78
79 static inline void
80 s1d13xxxfb_runinit(struct s1d13xxxfb_par *par,
81                         const struct s1d13xxxfb_regval *initregs,
82                         const unsigned int size)
83 {
84         int i;
85
86         for (i = 0; i < size; i++) {
87                 if ((initregs[i].addr == S1DREG_DELAYOFF) ||
88                                 (initregs[i].addr == S1DREG_DELAYON))
89                         mdelay((int)initregs[i].value);
90                 else {
91                         s1d13xxxfb_writereg(par, initregs[i].addr, initregs[i].value);
92                 }
93         }
94
95         /* make sure the hardware can cope with us */
96         mdelay(1);
97 }
98
99 static inline void
100 lcd_enable(struct s1d13xxxfb_par *par, int enable)
101 {
102         u8 mode = s1d13xxxfb_readreg(par, S1DREG_COM_DISP_MODE);
103
104         if (enable)
105                 mode |= 0x01;
106         else
107                 mode &= ~0x01;
108
109         s1d13xxxfb_writereg(par, S1DREG_COM_DISP_MODE, mode);
110 }
111
112 static inline void
113 crt_enable(struct s1d13xxxfb_par *par, int enable)
114 {
115         u8 mode = s1d13xxxfb_readreg(par, S1DREG_COM_DISP_MODE);
116
117         if (enable)
118                 mode |= 0x02;
119         else
120                 mode &= ~0x02;
121
122         s1d13xxxfb_writereg(par, S1DREG_COM_DISP_MODE, mode);
123 }
124
125 /* framebuffer control routines */
126
127 static inline void
128 s1d13xxxfb_setup_pseudocolour(struct fb_info *info)
129 {
130         info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
131
132         info->var.red.length = 4;
133         info->var.green.length = 4;
134         info->var.blue.length = 4;
135 }
136
137 static inline void
138 s1d13xxxfb_setup_truecolour(struct fb_info *info)
139 {
140         info->fix.visual = FB_VISUAL_TRUECOLOR;
141         info->var.bits_per_pixel = 16;
142
143         info->var.red.length = 5;
144         info->var.red.offset = 11;
145
146         info->var.green.length = 6;
147         info->var.green.offset = 5;
148
149         info->var.blue.length = 5;
150         info->var.blue.offset = 0;
151 }
152
153 /**
154  *      s1d13xxxfb_set_par - Alters the hardware state.
155  *      @info: frame buffer structure
156  *
157  *      Using the fb_var_screeninfo in fb_info we set the depth of the
158  *      framebuffer. This function alters the par AND the
159  *      fb_fix_screeninfo stored in fb_info. It doesn't not alter var in
160  *      fb_info since we are using that data. This means we depend on the
161  *      data in var inside fb_info to be supported by the hardware.
162  *      xxxfb_check_var is always called before xxxfb_set_par to ensure this.
163  *
164  *      XXX TODO: write proper s1d13xxxfb_check_var(), without which that
165  *      function is quite useless.
166  */
167 static int
168 s1d13xxxfb_set_par(struct fb_info *info)
169 {
170         struct s1d13xxxfb_par *s1dfb = info->par;
171         unsigned int val;
172
173         dbg("s1d13xxxfb_set_par: bpp=%d\n", info->var.bits_per_pixel);
174
175         if ((s1dfb->display & 0x01))    /* LCD */
176                 val = s1d13xxxfb_readreg(s1dfb, S1DREG_LCD_DISP_MODE);   /* read colour control */
177         else    /* CRT */
178                 val = s1d13xxxfb_readreg(s1dfb, S1DREG_CRT_DISP_MODE);   /* read colour control */
179
180         val &= ~0x07;
181
182         switch (info->var.bits_per_pixel) {
183                 case 4:
184                         dbg("pseudo colour 4\n");
185                         s1d13xxxfb_setup_pseudocolour(info);
186                         val |= 2;
187                         break;
188                 case 8:
189                         dbg("pseudo colour 8\n");
190                         s1d13xxxfb_setup_pseudocolour(info);
191                         val |= 3;
192                         break;
193                 case 16:
194                         dbg("true colour\n");
195                         s1d13xxxfb_setup_truecolour(info);
196                         val |= 5;
197                         break;
198
199                 default:
200                         dbg("bpp not supported!\n");
201                         return -EINVAL;
202         }
203
204         dbg("writing %02x to display mode register\n", val);
205
206         if ((s1dfb->display & 0x01))    /* LCD */
207                 s1d13xxxfb_writereg(s1dfb, S1DREG_LCD_DISP_MODE, val);
208         else    /* CRT */
209                 s1d13xxxfb_writereg(s1dfb, S1DREG_CRT_DISP_MODE, val);
210
211         info->fix.line_length  = info->var.xres * info->var.bits_per_pixel;
212         info->fix.line_length /= 8;
213
214         dbg("setting line_length to %d\n", info->fix.line_length);
215
216         dbg("done setup\n");
217
218         return 0;
219 }
220
221 /**
222  *      s1d13xxxfb_setcolreg - sets a color register.
223  *      @regno: Which register in the CLUT we are programming
224  *      @red: The red value which can be up to 16 bits wide
225  *      @green: The green value which can be up to 16 bits wide
226  *      @blue:  The blue value which can be up to 16 bits wide.
227  *      @transp: If supported the alpha value which can be up to 16 bits wide.
228  *      @info: frame buffer info structure
229  *
230  *      Returns negative errno on error, or zero on success.
231  */
232 static int
233 s1d13xxxfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
234                         u_int transp, struct fb_info *info)
235 {
236         struct s1d13xxxfb_par *s1dfb = info->par;
237         unsigned int pseudo_val;
238
239         if (regno >= S1D_PALETTE_SIZE)
240                 return -EINVAL;
241
242         dbg("s1d13xxxfb_setcolreg: %d: rgb=%d,%d,%d, tr=%d\n",
243                     regno, red, green, blue, transp);
244
245         if (info->var.grayscale)
246                 red = green = blue = (19595*red + 38470*green + 7471*blue) >> 16;
247
248         switch (info->fix.visual) {
249                 case FB_VISUAL_TRUECOLOR:
250                         if (regno >= 16)
251                                 return -EINVAL;
252
253                         /* deal with creating pseudo-palette entries */
254
255                         pseudo_val  = (red   >> 11) << info->var.red.offset;
256                         pseudo_val |= (green >> 10) << info->var.green.offset;
257                         pseudo_val |= (blue  >> 11) << info->var.blue.offset;
258
259                         dbg("s1d13xxxfb_setcolreg: pseudo %d, val %08x\n",
260                                     regno, pseudo_val);
261
262                         ((u32 *)info->pseudo_palette)[regno] = pseudo_val;
263
264                         break;
265                 case FB_VISUAL_PSEUDOCOLOR:
266                         s1d13xxxfb_writereg(s1dfb, S1DREG_LKUP_ADDR, regno);
267                         s1d13xxxfb_writereg(s1dfb, S1DREG_LKUP_DATA, red);
268                         s1d13xxxfb_writereg(s1dfb, S1DREG_LKUP_DATA, green);
269                         s1d13xxxfb_writereg(s1dfb, S1DREG_LKUP_DATA, blue);
270
271                         break;
272                 default:
273                         return -ENOSYS;
274         }
275
276         dbg("s1d13xxxfb_setcolreg: done\n");
277
278         return 0;
279 }
280
281 /**
282  *      s1d13xxxfb_blank - blanks the display.
283  *      @blank_mode: the blank mode we want.
284  *      @info: frame buffer structure that represents a single frame buffer
285  *
286  *      Blank the screen if blank_mode != 0, else unblank. Return 0 if
287  *      blanking succeeded, != 0 if un-/blanking failed due to e.g. a
288  *      video mode which doesn't support it. Implements VESA suspend
289  *      and powerdown modes on hardware that supports disabling hsync/vsync:
290  *      blank_mode == 2: suspend vsync
291  *      blank_mode == 3: suspend hsync
292  *      blank_mode == 4: powerdown
293  *
294  *      Returns negative errno on error, or zero on success.
295  */
296 static int
297 s1d13xxxfb_blank(int blank_mode, struct fb_info *info)
298 {
299         struct s1d13xxxfb_par *par = info->par;
300
301         dbg("s1d13xxxfb_blank: blank=%d, info=%p\n", blank_mode, info);
302
303         switch (blank_mode) {
304                 case FB_BLANK_UNBLANK:
305                 case FB_BLANK_NORMAL:
306                         if ((par->display & 0x01) != 0)
307                                 lcd_enable(par, 1);
308                         if ((par->display & 0x02) != 0)
309                                 crt_enable(par, 1);
310                         break;
311                 case FB_BLANK_VSYNC_SUSPEND:
312                 case FB_BLANK_HSYNC_SUSPEND:
313                         break;
314                 case FB_BLANK_POWERDOWN:
315                         lcd_enable(par, 0);
316                         crt_enable(par, 0);
317                         break;
318                 default:
319                         return -EINVAL;
320         }
321
322         /* let fbcon do a soft blank for us */
323         return ((blank_mode == FB_BLANK_NORMAL) ? 1 : 0);
324 }
325
326 /**
327  *      s1d13xxxfb_pan_display - Pans the display.
328  *      @var: frame buffer variable screen structure
329  *      @info: frame buffer structure that represents a single frame buffer
330  *
331  *      Pan (or wrap, depending on the `vmode' field) the display using the
332  *      `yoffset' field of the `var' structure (`xoffset'  not yet supported).
333  *      If the values don't fit, return -EINVAL.
334  *
335  *      Returns negative errno on error, or zero on success.
336  */
337 static int
338 s1d13xxxfb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
339 {
340         struct s1d13xxxfb_par *par = info->par;
341         u32 start;
342
343         if (var->xoffset != 0)  /* not yet ... */
344                 return -EINVAL;
345
346         if (var->yoffset + info->var.yres > info->var.yres_virtual)
347                 return -EINVAL;
348
349         start = (info->fix.line_length >> 1) * var->yoffset;
350
351         if ((par->display & 0x01)) {
352                 /* LCD */
353                 s1d13xxxfb_writereg(par, S1DREG_LCD_DISP_START0, (start & 0xff));
354                 s1d13xxxfb_writereg(par, S1DREG_LCD_DISP_START1, ((start >> 8) & 0xff));
355                 s1d13xxxfb_writereg(par, S1DREG_LCD_DISP_START2, ((start >> 16) & 0x0f));
356         } else {
357                 /* CRT */
358                 s1d13xxxfb_writereg(par, S1DREG_CRT_DISP_START0, (start & 0xff));
359                 s1d13xxxfb_writereg(par, S1DREG_CRT_DISP_START1, ((start >> 8) & 0xff));
360                 s1d13xxxfb_writereg(par, S1DREG_CRT_DISP_START2, ((start >> 16) & 0x0f));
361         }
362
363         return 0;
364 }
365
366
367 /* framebuffer information structures */
368
369 static struct fb_ops s1d13xxxfb_fbops = {
370         .owner          = THIS_MODULE,
371         .fb_set_par     = s1d13xxxfb_set_par,
372         .fb_setcolreg   = s1d13xxxfb_setcolreg,
373         .fb_blank       = s1d13xxxfb_blank,
374
375         .fb_pan_display = s1d13xxxfb_pan_display,
376
377         /* to be replaced by any acceleration we can */
378         .fb_fillrect    = cfb_fillrect,
379         .fb_copyarea    = cfb_copyarea,
380         .fb_imageblit   = cfb_imageblit,
381         .fb_cursor      = soft_cursor
382 };
383
384 static int s1d13xxxfb_width_tab[2][4] __devinitdata = {
385         {4, 8, 16, -1},
386         {9, 12, 18, -1},
387 };
388
389 /**
390  *      s1d13xxxfb_fetch_hw_state - Configure the framebuffer according to
391  *      hardware setup.
392  *      @info: frame buffer structure
393  *
394  *      We setup the framebuffer structures according to the current
395  *      hardware setup. On some machines, the BIOS will have filled
396  *      the chip registers with such info, on others, these values will
397  *      have been written in some init procedure. In any case, the
398  *      software values needs to match the hardware ones. This is what
399  *      this function ensures.
400  *
401  *      Note: some of the hardcoded values here might need some love to
402  *      work on various chips, and might need to no longer be hardcoded.
403  */
404 static void __devinit
405 s1d13xxxfb_fetch_hw_state(struct fb_info *info)
406 {
407         struct fb_var_screeninfo *var = &info->var;
408         struct fb_fix_screeninfo *fix = &info->fix;
409         struct s1d13xxxfb_par *par = info->par;
410         u8 panel, display;
411         u16 offset;
412         u32 xres, yres;
413         u32 xres_virtual, yres_virtual;
414         int bpp, lcd_bpp;
415         int is_color, is_dual, is_tft;
416         int lcd_enabled, crt_enabled;
417
418         fix->type = FB_TYPE_PACKED_PIXELS;
419
420         /* general info */
421         par->display = s1d13xxxfb_readreg(par, S1DREG_COM_DISP_MODE);
422         crt_enabled = (par->display & 0x02) != 0;
423         lcd_enabled = (par->display & 0x01) != 0;
424
425         if (lcd_enabled && crt_enabled)
426                 printk(KERN_WARNING PFX "Warning: LCD and CRT detected, using LCD\n");
427
428         if (lcd_enabled)
429                 display = s1d13xxxfb_readreg(par, S1DREG_LCD_DISP_MODE);
430         else    /* CRT */
431                 display = s1d13xxxfb_readreg(par, S1DREG_CRT_DISP_MODE);
432
433         bpp = display & 0x07;
434
435         switch (bpp) {
436                 case 2: /* 4 bpp */
437                 case 3: /* 8 bpp */
438                         var->bits_per_pixel = 8;
439                         var->red.offset = var->green.offset = var->blue.offset = 0;
440                         var->red.length = var->green.length = var->blue.length = 8;
441                         break;
442                 case 5: /* 16 bpp */
443                         s1d13xxxfb_setup_truecolour(info);
444                         break;
445                 default:
446                         dbg("bpp: %i\n", bpp);
447         }
448         fb_alloc_cmap(&info->cmap, 256, 0);
449
450         /* LCD info */
451         panel = s1d13xxxfb_readreg(par, S1DREG_PANEL_TYPE);
452         is_color = (panel & 0x04) != 0;
453         is_dual = (panel & 0x02) != 0;
454         is_tft = (panel & 0x01) != 0;
455         lcd_bpp = s1d13xxxfb_width_tab[is_tft][(panel >> 4) & 3];
456
457         if (lcd_enabled) {
458                 xres = (s1d13xxxfb_readreg(par, S1DREG_LCD_DISP_HWIDTH) + 1) * 8;
459                 yres = (s1d13xxxfb_readreg(par, S1DREG_LCD_DISP_VHEIGHT0) +
460                         ((s1d13xxxfb_readreg(par, S1DREG_LCD_DISP_VHEIGHT1) & 0x03) << 8) + 1);
461
462                 offset = (s1d13xxxfb_readreg(par, S1DREG_LCD_MEM_OFF0) +
463                         ((s1d13xxxfb_readreg(par, S1DREG_LCD_MEM_OFF1) & 0x7) << 8));
464         } else { /* crt */
465                 xres = (s1d13xxxfb_readreg(par, S1DREG_CRT_DISP_HWIDTH) + 1) * 8;
466                 yres = (s1d13xxxfb_readreg(par, S1DREG_CRT_DISP_VHEIGHT0) +
467                         ((s1d13xxxfb_readreg(par, S1DREG_CRT_DISP_VHEIGHT1) & 0x03) << 8) + 1);
468
469                 offset = (s1d13xxxfb_readreg(par, S1DREG_CRT_MEM_OFF0) +
470                         ((s1d13xxxfb_readreg(par, S1DREG_CRT_MEM_OFF1) & 0x7) << 8));
471         }
472         xres_virtual = offset * 16 / var->bits_per_pixel;
473         yres_virtual = fix->smem_len / (offset * 2);
474
475         var->xres               = xres;
476         var->yres               = yres;
477         var->xres_virtual       = xres_virtual;
478         var->yres_virtual       = yres_virtual;
479         var->xoffset            = var->yoffset = 0;
480
481         fix->line_length        = offset * 2;
482
483         var->grayscale          = !is_color;
484
485         var->activate           = FB_ACTIVATE_NOW;
486
487         dbg(PFX "bpp=%d, lcd_bpp=%d, "
488                 "crt_enabled=%d, lcd_enabled=%d\n",
489                 var->bits_per_pixel, lcd_bpp, crt_enabled, lcd_enabled);
490         dbg(PFX "xres=%d, yres=%d, vxres=%d, vyres=%d "
491                 "is_color=%d, is_dual=%d, is_tft=%d\n",
492                 xres, yres, xres_virtual, yres_virtual, is_color, is_dual, is_tft);
493 }
494
495
496 static int
497 s1d13xxxfb_remove(struct device *dev)
498 {
499         struct fb_info *info = dev_get_drvdata(dev);
500         struct platform_device *pdev = to_platform_device(dev);
501         struct s1d13xxxfb_par *par = NULL;
502
503         if (info) {
504                 par = info->par;
505                 if (par && par->regs) {
506                         /* disable output & enable powersave */
507                         s1d13xxxfb_writereg(par, S1DREG_COM_DISP_MODE, 0x00);
508                         s1d13xxxfb_writereg(par, S1DREG_PS_CNF, 0x11);
509                         iounmap(par->regs);
510                 }
511
512                 fb_dealloc_cmap(&info->cmap);
513
514                 if (info->screen_base)
515                         iounmap(info->screen_base);
516
517                 framebuffer_release(info);
518         }
519
520         release_mem_region(pdev->resource[0].start,
521                         pdev->resource[0].end - pdev->resource[0].start +1);
522         release_mem_region(pdev->resource[1].start,
523                         pdev->resource[1].end - pdev->resource[1].start +1);
524         return 0;
525 }
526
527 static int __devinit
528 s1d13xxxfb_probe(struct device *dev)
529 {
530         struct platform_device *pdev = to_platform_device(dev);
531         struct s1d13xxxfb_par *default_par;
532         struct fb_info *info;
533         struct s1d13xxxfb_pdata *pdata = NULL;
534         int ret = 0;
535         u8 revision;
536
537         dbg("probe called: device is %p\n", dev);
538
539         printk(KERN_INFO "Epson S1D13XXX FB Driver\n");
540
541         /* enable platform-dependent hardware glue, if any */
542         if (dev->platform_data)
543                 pdata = dev->platform_data;
544
545         if (pdata && pdata->platform_init_video)
546                 pdata->platform_init_video();
547
548
549         if (pdev->num_resources != 2) {
550                 dev_err(&pdev->dev, "invalid num_resources: %i\n",
551                        pdev->num_resources);
552                 ret = -ENODEV;
553                 goto bail;
554         }
555
556         /* resource[0] is VRAM, resource[1] is registers */
557         if (pdev->resource[0].flags != IORESOURCE_MEM
558                         || pdev->resource[1].flags != IORESOURCE_MEM) {
559                 dev_err(&pdev->dev, "invalid resource type\n");
560                 ret = -ENODEV;
561                 goto bail;
562         }
563
564         if (!request_mem_region(pdev->resource[0].start,
565                 pdev->resource[0].end - pdev->resource[0].start +1, "s1d13xxxfb mem")) {
566                 dev_dbg(dev, "request_mem_region failed\n");
567                 ret = -EBUSY;
568                 goto bail;
569         }
570
571         if (!request_mem_region(pdev->resource[1].start,
572                 pdev->resource[1].end - pdev->resource[1].start +1, "s1d13xxxfb regs")) {
573                 dev_dbg(dev, "request_mem_region failed\n");
574                 ret = -EBUSY;
575                 goto bail;
576         }
577
578         info = framebuffer_alloc(sizeof(struct s1d13xxxfb_par) + sizeof(u32) * 256, &pdev->dev);
579         if (!info) {
580                 ret = -ENOMEM;
581                 goto bail;
582         }
583
584         default_par = info->par;
585         default_par->regs = ioremap_nocache(pdev->resource[1].start,
586                         pdev->resource[1].end - pdev->resource[1].start +1);
587         if (!default_par->regs) {
588                 printk(KERN_ERR PFX "unable to map registers\n");
589                 ret = -ENOMEM;
590                 goto bail;
591         }
592         info->pseudo_palette = default_par->pseudo_palette;
593
594         info->screen_base = ioremap_nocache(pdev->resource[0].start,
595                         pdev->resource[0].end - pdev->resource[0].start +1);
596
597         if (!info->screen_base) {
598                 printk(KERN_ERR PFX "unable to map framebuffer\n");
599                 ret = -ENOMEM;
600                 goto bail;
601         }
602
603         revision = s1d13xxxfb_readreg(default_par, S1DREG_REV_CODE);
604         if ((revision >> 2) != S1D_CHIP_REV) {
605                 printk(KERN_INFO PFX "chip not found: %i\n", (revision >> 2));
606                 ret = -ENODEV;
607                 goto bail;
608         }
609
610         info->fix = s1d13xxxfb_fix;
611         info->fix.mmio_start = pdev->resource[1].start;
612         info->fix.mmio_len = pdev->resource[1].end - pdev->resource[1].start +1;
613         info->fix.smem_start = pdev->resource[0].start;
614         info->fix.smem_len = pdev->resource[0].end - pdev->resource[0].start +1;
615
616         printk(KERN_INFO PFX "regs mapped at 0x%p, fb %d KiB mapped at 0x%p\n",
617                default_par->regs, info->fix.smem_len / 1024, info->screen_base);
618
619         info->par = default_par;
620         info->fbops = &s1d13xxxfb_fbops;
621         info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
622
623         /* perform "manual" chip initialization, if needed */
624         if (pdata && pdata->initregs)
625                 s1d13xxxfb_runinit(info->par, pdata->initregs, pdata->initregssize);
626
627         s1d13xxxfb_fetch_hw_state(info);
628
629         if (register_framebuffer(info) < 0) {
630                 ret = -EINVAL;
631                 goto bail;
632         }
633
634         dev_set_drvdata(&pdev->dev, info);
635
636         printk(KERN_INFO "fb%d: %s frame buffer device\n",
637                info->node, info->fix.id);
638
639         return 0;
640
641 bail:
642         s1d13xxxfb_remove(dev);
643         return ret;
644
645 }
646
647 #ifdef CONFIG_PM
648 static int s1d13xxxfb_suspend(struct device *dev, u32 state, u32 level)
649 {
650         struct fb_info *info = dev_get_drvdata(dev);
651         struct s1d13xxxfb_par *s1dfb = info->par;
652         struct s1d13xxxfb_pdata *pdata = NULL;
653
654         /* disable display */
655         lcd_enable(s1dfb, 0);
656         crt_enable(s1dfb, 0);
657
658         if (dev->platform_data)
659                 pdata = dev->platform_data;
660
661 #if 0
662         if (!s1dfb->disp_save)
663                 s1dfb->disp_save = kmalloc(info->fix.smem_len, GFP_KERNEL);
664
665         if (!s1dfb->disp_save) {
666                 printk(KERN_ERR PFX "no memory to save screen");
667                 return -ENOMEM;
668         }
669
670         memcpy_fromio(s1dfb->disp_save, info->screen_base, info->fix.smem_len);
671 #else
672         s1dfb->disp_save = NULL;
673 #endif
674
675         if (!s1dfb->regs_save)
676                 s1dfb->regs_save = kmalloc(info->fix.mmio_len, GFP_KERNEL);
677
678         if (!s1dfb->regs_save) {
679                 printk(KERN_ERR PFX "no memory to save registers");
680                 return -ENOMEM;
681         }
682
683         /* backup all registers */
684         memcpy_fromio(s1dfb->regs_save, s1dfb->regs, info->fix.mmio_len);
685
686         /* now activate power save mode */
687         s1d13xxxfb_writereg(s1dfb, S1DREG_PS_CNF, 0x11);
688
689         if (pdata && pdata->platform_suspend_video)
690                 return pdata->platform_suspend_video();
691         else
692                 return 0;
693 }
694
695 static int s1d13xxxfb_resume(struct device *dev, u32 level)
696 {
697         struct fb_info *info = dev_get_drvdata(dev);
698         struct s1d13xxxfb_par *s1dfb = info->par;
699         struct s1d13xxxfb_pdata *pdata = NULL;
700
701         if (level != RESUME_ENABLE)
702                 return 0;
703
704         /* awaken the chip */
705         s1d13xxxfb_writereg(s1dfb, S1DREG_PS_CNF, 0x10);
706
707         /* do not let go until SDRAM "wakes up" */
708         while ((s1d13xxxfb_readreg(s1dfb, S1DREG_PS_STATUS) & 0x01))
709                 udelay(10);
710
711         if (dev->platform_data)
712                 pdata = dev->platform_data;
713
714         if (s1dfb->regs_save) {
715                 /* will write RO regs, *should* get away with it :) */
716                 memcpy_toio(s1dfb->regs, s1dfb->regs_save, info->fix.mmio_len);
717                 kfree(s1dfb->regs_save);
718         }
719
720         if (s1dfb->disp_save) {
721                 memcpy_toio(info->screen_base, s1dfb->disp_save,
722                                 info->fix.smem_len);
723                 kfree(s1dfb->disp_save);        /* XXX kmalloc()'d when? */
724         }
725
726         if ((s1dfb->display & 0x01) != 0)
727                 lcd_enable(s1dfb, 1);
728         if ((s1dfb->display & 0x02) != 0)
729                 crt_enable(s1dfb, 1);
730
731         if (pdata && pdata->platform_resume_video)
732                 return pdata->platform_resume_video();
733         else
734                 return 0;
735 }
736 #endif /* CONFIG_PM */
737
738 static struct device_driver s1d13xxxfb_driver = {
739         .name           = S1D_DEVICENAME,
740         .bus            = &platform_bus_type,
741         .probe          = s1d13xxxfb_probe,
742         .remove         = s1d13xxxfb_remove,
743 #ifdef CONFIG_PM
744         .suspend        = s1d13xxxfb_suspend,
745         .resume         = s1d13xxxfb_resume
746 #endif
747 };
748
749
750 static int __init
751 s1d13xxxfb_init(void)
752 {
753         if (fb_get_options("s1d13xxxfb", NULL))
754                 return -ENODEV;
755
756         return driver_register(&s1d13xxxfb_driver);
757 }
758
759
760 static void __exit
761 s1d13xxxfb_exit(void)
762 {
763         driver_unregister(&s1d13xxxfb_driver);
764 }
765
766 module_init(s1d13xxxfb_init);
767 module_exit(s1d13xxxfb_exit);
768
769
770 MODULE_LICENSE("GPL");
771 MODULE_DESCRIPTION("Framebuffer driver for S1D13xxx devices");
772 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>, Thibaut VARENE <varenet@parisc-linux.org>");