Merge git://git.infradead.org/battery-2.6
[linux-2.6] / drivers / video / s3c2410fb.c
1 /*
2  * linux/drivers/video/s3c2410fb.c
3  *      Copyright (c) Arnaud Patard, Ben Dooks
4  *
5  * This file is subject to the terms and conditions of the GNU General Public
6  * License.  See the file COPYING in the main directory of this archive for
7  * more details.
8  *
9  *          S3C2410 LCD Controller Frame Buffer Driver
10  *          based on skeletonfb.c, sa1100fb.c and others
11  *
12  * ChangeLog
13  * 2005-04-07: Arnaud Patard <arnaud.patard@rtp-net.org>
14  *      - u32 state -> pm_message_t state
15  *      - S3C2410_{VA,SZ}_LCD -> S3C24XX
16  *
17  * 2005-03-15: Arnaud Patard <arnaud.patard@rtp-net.org>
18  *      - Removed the ioctl
19  *      - use readl/writel instead of __raw_writel/__raw_readl
20  *
21  * 2004-12-04: Arnaud Patard <arnaud.patard@rtp-net.org>
22  *      - Added the possibility to set on or off the
23  *      debugging messages
24  *      - Replaced 0 and 1 by on or off when reading the
25  *      /sys files
26  *
27  * 2005-03-23: Ben Dooks <ben-linux@fluff.org>
28  *      - added non 16bpp modes
29  *      - updated platform information for range of x/y/bpp
30  *      - add code to ensure palette is written correctly
31  *      - add pixel clock divisor control
32  *
33  * 2004-11-11: Arnaud Patard <arnaud.patard@rtp-net.org>
34  *      - Removed the use of currcon as it no more exists
35  *      - Added LCD power sysfs interface
36  *
37  * 2004-11-03: Ben Dooks <ben-linux@fluff.org>
38  *      - minor cleanups
39  *      - add suspend/resume support
40  *      - s3c2410fb_setcolreg() not valid in >8bpp modes
41  *      - removed last CONFIG_FB_S3C2410_FIXED
42  *      - ensure lcd controller stopped before cleanup
43  *      - added sysfs interface for backlight power
44  *      - added mask for gpio configuration
45  *      - ensured IRQs disabled during GPIO configuration
46  *      - disable TPAL before enabling video
47  *
48  * 2004-09-20: Arnaud Patard <arnaud.patard@rtp-net.org>
49  *      - Suppress command line options
50  *
51  * 2004-09-15: Arnaud Patard <arnaud.patard@rtp-net.org>
52  *      - code cleanup
53  *
54  * 2004-09-07: Arnaud Patard <arnaud.patard@rtp-net.org>
55  *      - Renamed from h1940fb.c to s3c2410fb.c
56  *      - Add support for different devices
57  *      - Backlight support
58  *
59  * 2004-09-05: Herbert Pötzl <herbert@13thfloor.at>
60  *      - added clock (de-)allocation code
61  *      - added fixem fbmem option
62  *
63  * 2004-07-27: Arnaud Patard <arnaud.patard@rtp-net.org>
64  *      - code cleanup
65  *      - added a forgotten return in h1940fb_init
66  *
67  * 2004-07-19: Herbert Pötzl <herbert@13thfloor.at>
68  *      - code cleanup and extended debugging
69  *
70  * 2004-07-15: Arnaud Patard <arnaud.patard@rtp-net.org>
71  *      - First version
72  */
73
74 #include <linux/module.h>
75 #include <linux/kernel.h>
76 #include <linux/errno.h>
77 #include <linux/string.h>
78 #include <linux/mm.h>
79 #include <linux/slab.h>
80 #include <linux/delay.h>
81 #include <linux/fb.h>
82 #include <linux/init.h>
83 #include <linux/dma-mapping.h>
84 #include <linux/interrupt.h>
85 #include <linux/platform_device.h>
86 #include <linux/clk.h>
87
88 #include <asm/io.h>
89 #include <asm/div64.h>
90
91 #include <asm/mach/map.h>
92 #include <asm/arch/regs-lcd.h>
93 #include <asm/arch/regs-gpio.h>
94 #include <asm/arch/fb.h>
95
96 #ifdef CONFIG_PM
97 #include <linux/pm.h>
98 #endif
99
100 #include "s3c2410fb.h"
101
102 /* Debugging stuff */
103 #ifdef CONFIG_FB_S3C2410_DEBUG
104 static int debug        = 1;
105 #else
106 static int debug        = 0;
107 #endif
108
109 #define dprintk(msg...) if (debug) { printk(KERN_DEBUG "s3c2410fb: " msg); }
110
111 /* useful functions */
112
113 /* s3c2410fb_set_lcdaddr
114  *
115  * initialise lcd controller address pointers
116  */
117 static void s3c2410fb_set_lcdaddr(struct fb_info *info)
118 {
119         unsigned long saddr1, saddr2, saddr3;
120         struct s3c2410fb_info *fbi = info->par;
121         void __iomem *regs = fbi->io;
122
123         saddr1  = info->fix.smem_start >> 1;
124         saddr2  = info->fix.smem_start;
125         saddr2 += info->fix.line_length * info->var.yres;
126         saddr2 >>= 1;
127
128         saddr3 = S3C2410_OFFSIZE(0) |
129                  S3C2410_PAGEWIDTH((info->fix.line_length / 2) & 0x3ff);
130
131         dprintk("LCDSADDR1 = 0x%08lx\n", saddr1);
132         dprintk("LCDSADDR2 = 0x%08lx\n", saddr2);
133         dprintk("LCDSADDR3 = 0x%08lx\n", saddr3);
134
135         writel(saddr1, regs + S3C2410_LCDSADDR1);
136         writel(saddr2, regs + S3C2410_LCDSADDR2);
137         writel(saddr3, regs + S3C2410_LCDSADDR3);
138 }
139
140 /* s3c2410fb_calc_pixclk()
141  *
142  * calculate divisor for clk->pixclk
143  */
144 static unsigned int s3c2410fb_calc_pixclk(struct s3c2410fb_info *fbi,
145                                           unsigned long pixclk)
146 {
147         unsigned long clk = clk_get_rate(fbi->clk);
148         unsigned long long div;
149
150         /* pixclk is in picoseconds, our clock is in Hz
151          *
152          * Hz -> picoseconds is / 10^-12
153          */
154
155         div = (unsigned long long)clk * pixclk;
156         div >>= 12;                     /* div / 2^12 */
157         do_div(div, 625 * 625UL * 625); /* div / 5^12 */
158
159         dprintk("pixclk %ld, divisor is %ld\n", pixclk, (long)div);
160         return div;
161 }
162
163 /*
164  *      s3c2410fb_check_var():
165  *      Get the video params out of 'var'. If a value doesn't fit, round it up,
166  *      if it's too big, return -EINVAL.
167  *
168  */
169 static int s3c2410fb_check_var(struct fb_var_screeninfo *var,
170                                struct fb_info *info)
171 {
172         struct s3c2410fb_info *fbi = info->par;
173         struct s3c2410fb_mach_info *mach_info = fbi->dev->platform_data;
174         struct s3c2410fb_display *display = NULL;
175         struct s3c2410fb_display *default_display = mach_info->displays +
176                                                     mach_info->default_display;
177         int type = default_display->type;
178         unsigned i;
179
180         dprintk("check_var(var=%p, info=%p)\n", var, info);
181
182         /* validate x/y resolution */
183         /* choose default mode if possible */
184         if (var->yres == default_display->yres &&
185             var->xres == default_display->xres &&
186             var->bits_per_pixel == default_display->bpp)
187                 display = default_display;
188         else
189                 for (i = 0; i < mach_info->num_displays; i++)
190                         if (type == mach_info->displays[i].type &&
191                             var->yres == mach_info->displays[i].yres &&
192                             var->xres == mach_info->displays[i].xres &&
193                             var->bits_per_pixel == mach_info->displays[i].bpp) {
194                                 display = mach_info->displays + i;
195                                 break;
196                         }
197
198         if (!display) {
199                 dprintk("wrong resolution or depth %dx%d at %d bpp\n",
200                         var->xres, var->yres, var->bits_per_pixel);
201                 return -EINVAL;
202         }
203
204         /* it is always the size as the display */
205         var->xres_virtual = display->xres;
206         var->yres_virtual = display->yres;
207         var->height = display->height;
208         var->width = display->width;
209
210         /* copy lcd settings */
211         var->pixclock = display->pixclock;
212         var->left_margin = display->left_margin;
213         var->right_margin = display->right_margin;
214         var->upper_margin = display->upper_margin;
215         var->lower_margin = display->lower_margin;
216         var->vsync_len = display->vsync_len;
217         var->hsync_len = display->hsync_len;
218
219         fbi->regs.lcdcon5 = display->lcdcon5;
220         /* set display type */
221         fbi->regs.lcdcon1 = display->type;
222
223         var->transp.offset = 0;
224         var->transp.length = 0;
225         /* set r/g/b positions */
226         switch (var->bits_per_pixel) {
227         case 1:
228         case 2:
229         case 4:
230                 var->red.offset = 0;
231                 var->red.length = var->bits_per_pixel;
232                 var->green      = var->red;
233                 var->blue       = var->red;
234                 break;
235         case 8:
236                 if (display->type != S3C2410_LCDCON1_TFT) {
237                         /* 8 bpp 332 */
238                         var->red.length         = 3;
239                         var->red.offset         = 5;
240                         var->green.length       = 3;
241                         var->green.offset       = 2;
242                         var->blue.length        = 2;
243                         var->blue.offset        = 0;
244                 } else {
245                         var->red.offset         = 0;
246                         var->red.length         = 8;
247                         var->green              = var->red;
248                         var->blue               = var->red;
249                 }
250                 break;
251         case 12:
252                 /* 12 bpp 444 */
253                 var->red.length         = 4;
254                 var->red.offset         = 8;
255                 var->green.length       = 4;
256                 var->green.offset       = 4;
257                 var->blue.length        = 4;
258                 var->blue.offset        = 0;
259                 break;
260
261         default:
262         case 16:
263                 if (display->lcdcon5 & S3C2410_LCDCON5_FRM565) {
264                         /* 16 bpp, 565 format */
265                         var->red.offset         = 11;
266                         var->green.offset       = 5;
267                         var->blue.offset        = 0;
268                         var->red.length         = 5;
269                         var->green.length       = 6;
270                         var->blue.length        = 5;
271                 } else {
272                         /* 16 bpp, 5551 format */
273                         var->red.offset         = 11;
274                         var->green.offset       = 6;
275                         var->blue.offset        = 1;
276                         var->red.length         = 5;
277                         var->green.length       = 5;
278                         var->blue.length        = 5;
279                 }
280                 break;
281         case 32:
282                 /* 24 bpp 888 and 8 dummy */
283                 var->red.length         = 8;
284                 var->red.offset         = 16;
285                 var->green.length       = 8;
286                 var->green.offset       = 8;
287                 var->blue.length        = 8;
288                 var->blue.offset        = 0;
289                 break;
290         }
291         return 0;
292 }
293
294 /* s3c2410fb_calculate_stn_lcd_regs
295  *
296  * calculate register values from var settings
297  */
298 static void s3c2410fb_calculate_stn_lcd_regs(const struct fb_info *info,
299                                              struct s3c2410fb_hw *regs)
300 {
301         const struct s3c2410fb_info *fbi = info->par;
302         const struct fb_var_screeninfo *var = &info->var;
303         int type = regs->lcdcon1 & ~S3C2410_LCDCON1_TFT;
304         int hs = var->xres >> 2;
305         unsigned wdly = (var->left_margin >> 4) - 1;
306         unsigned wlh = (var->hsync_len >> 4) - 1;
307
308         if (type != S3C2410_LCDCON1_STN4)
309                 hs >>= 1;
310
311         switch (var->bits_per_pixel) {
312         case 1:
313                 regs->lcdcon1 |= S3C2410_LCDCON1_STN1BPP;
314                 break;
315         case 2:
316                 regs->lcdcon1 |= S3C2410_LCDCON1_STN2GREY;
317                 break;
318         case 4:
319                 regs->lcdcon1 |= S3C2410_LCDCON1_STN4GREY;
320                 break;
321         case 8:
322                 regs->lcdcon1 |= S3C2410_LCDCON1_STN8BPP;
323                 hs *= 3;
324                 break;
325         case 12:
326                 regs->lcdcon1 |= S3C2410_LCDCON1_STN12BPP;
327                 hs *= 3;
328                 break;
329
330         default:
331                 /* invalid pixel depth */
332                 dev_err(fbi->dev, "invalid bpp %d\n",
333                         var->bits_per_pixel);
334         }
335         /* update X/Y info */
336         dprintk("setting horz: lft=%d, rt=%d, sync=%d\n",
337                 var->left_margin, var->right_margin, var->hsync_len);
338
339         regs->lcdcon2 = S3C2410_LCDCON2_LINEVAL(var->yres - 1);
340
341         if (wdly > 3)
342                 wdly = 3;
343
344         if (wlh > 3)
345                 wlh = 3;
346
347         regs->lcdcon3 = S3C2410_LCDCON3_WDLY(wdly) |
348                         S3C2410_LCDCON3_LINEBLANK(var->right_margin / 8) |
349                         S3C2410_LCDCON3_HOZVAL(hs - 1);
350
351         regs->lcdcon4 = S3C2410_LCDCON4_WLH(wlh);
352 }
353
354 /* s3c2410fb_calculate_tft_lcd_regs
355  *
356  * calculate register values from var settings
357  */
358 static void s3c2410fb_calculate_tft_lcd_regs(const struct fb_info *info,
359                                              struct s3c2410fb_hw *regs)
360 {
361         const struct s3c2410fb_info *fbi = info->par;
362         const struct fb_var_screeninfo *var = &info->var;
363
364         switch (var->bits_per_pixel) {
365         case 1:
366                 regs->lcdcon1 |= S3C2410_LCDCON1_TFT1BPP;
367                 break;
368         case 2:
369                 regs->lcdcon1 |= S3C2410_LCDCON1_TFT2BPP;
370                 break;
371         case 4:
372                 regs->lcdcon1 |= S3C2410_LCDCON1_TFT4BPP;
373                 break;
374         case 8:
375                 regs->lcdcon1 |= S3C2410_LCDCON1_TFT8BPP;
376                 regs->lcdcon5 |= S3C2410_LCDCON5_BSWP |
377                                  S3C2410_LCDCON5_FRM565;
378                 regs->lcdcon5 &= ~S3C2410_LCDCON5_HWSWP;
379                 break;
380         case 16:
381                 regs->lcdcon1 |= S3C2410_LCDCON1_TFT16BPP;
382                 regs->lcdcon5 &= ~S3C2410_LCDCON5_BSWP;
383                 regs->lcdcon5 |= S3C2410_LCDCON5_HWSWP;
384                 break;
385         case 32:
386                 regs->lcdcon1 |= S3C2410_LCDCON1_TFT24BPP;
387                 regs->lcdcon5 &= ~(S3C2410_LCDCON5_BSWP |
388                                    S3C2410_LCDCON5_HWSWP |
389                                    S3C2410_LCDCON5_BPP24BL);
390                 break;
391         default:
392                 /* invalid pixel depth */
393                 dev_err(fbi->dev, "invalid bpp %d\n",
394                         var->bits_per_pixel);
395         }
396         /* update X/Y info */
397         dprintk("setting vert: up=%d, low=%d, sync=%d\n",
398                 var->upper_margin, var->lower_margin, var->vsync_len);
399
400         dprintk("setting horz: lft=%d, rt=%d, sync=%d\n",
401                 var->left_margin, var->right_margin, var->hsync_len);
402
403         regs->lcdcon2 = S3C2410_LCDCON2_LINEVAL(var->yres - 1) |
404                         S3C2410_LCDCON2_VBPD(var->upper_margin - 1) |
405                         S3C2410_LCDCON2_VFPD(var->lower_margin - 1) |
406                         S3C2410_LCDCON2_VSPW(var->vsync_len - 1);
407
408         regs->lcdcon3 = S3C2410_LCDCON3_HBPD(var->right_margin - 1) |
409                         S3C2410_LCDCON3_HFPD(var->left_margin - 1) |
410                         S3C2410_LCDCON3_HOZVAL(var->xres - 1);
411
412         regs->lcdcon4 = S3C2410_LCDCON4_HSPW(var->hsync_len - 1);
413 }
414
415 /* s3c2410fb_activate_var
416  *
417  * activate (set) the controller from the given framebuffer
418  * information
419  */
420 static void s3c2410fb_activate_var(struct fb_info *info)
421 {
422         struct s3c2410fb_info *fbi = info->par;
423         void __iomem *regs = fbi->io;
424         int type = fbi->regs.lcdcon1 & S3C2410_LCDCON1_TFT;
425         struct fb_var_screeninfo *var = &info->var;
426         int clkdiv = s3c2410fb_calc_pixclk(fbi, var->pixclock) / 2;
427
428         dprintk("%s: var->xres  = %d\n", __FUNCTION__, var->xres);
429         dprintk("%s: var->yres  = %d\n", __FUNCTION__, var->yres);
430         dprintk("%s: var->bpp   = %d\n", __FUNCTION__, var->bits_per_pixel);
431
432         if (type == S3C2410_LCDCON1_TFT) {
433                 s3c2410fb_calculate_tft_lcd_regs(info, &fbi->regs);
434                 --clkdiv;
435                 if (clkdiv < 0)
436                         clkdiv = 0;
437         } else {
438                 s3c2410fb_calculate_stn_lcd_regs(info, &fbi->regs);
439                 if (clkdiv < 2)
440                         clkdiv = 2;
441         }
442
443         fbi->regs.lcdcon1 |=  S3C2410_LCDCON1_CLKVAL(clkdiv);
444
445         /* write new registers */
446
447         dprintk("new register set:\n");
448         dprintk("lcdcon[1] = 0x%08lx\n", fbi->regs.lcdcon1);
449         dprintk("lcdcon[2] = 0x%08lx\n", fbi->regs.lcdcon2);
450         dprintk("lcdcon[3] = 0x%08lx\n", fbi->regs.lcdcon3);
451         dprintk("lcdcon[4] = 0x%08lx\n", fbi->regs.lcdcon4);
452         dprintk("lcdcon[5] = 0x%08lx\n", fbi->regs.lcdcon5);
453
454         writel(fbi->regs.lcdcon1 & ~S3C2410_LCDCON1_ENVID,
455                 regs + S3C2410_LCDCON1);
456         writel(fbi->regs.lcdcon2, regs + S3C2410_LCDCON2);
457         writel(fbi->regs.lcdcon3, regs + S3C2410_LCDCON3);
458         writel(fbi->regs.lcdcon4, regs + S3C2410_LCDCON4);
459         writel(fbi->regs.lcdcon5, regs + S3C2410_LCDCON5);
460
461         /* set lcd address pointers */
462         s3c2410fb_set_lcdaddr(info);
463
464         fbi->regs.lcdcon1 |= S3C2410_LCDCON1_ENVID,
465         writel(fbi->regs.lcdcon1, regs + S3C2410_LCDCON1);
466 }
467
468 /*
469  *      s3c2410fb_set_par - Alters the hardware state.
470  *      @info: frame buffer structure that represents a single frame buffer
471  *
472  */
473 static int s3c2410fb_set_par(struct fb_info *info)
474 {
475         struct fb_var_screeninfo *var = &info->var;
476
477         switch (var->bits_per_pixel) {
478         case 32:
479         case 16:
480         case 12:
481                 info->fix.visual = FB_VISUAL_TRUECOLOR;
482                 break;
483         case 1:
484                 info->fix.visual = FB_VISUAL_MONO01;
485                 break;
486         default:
487                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
488                 break;
489         }
490
491         info->fix.line_length = (var->xres_virtual * var->bits_per_pixel) / 8;
492
493         /* activate this new configuration */
494
495         s3c2410fb_activate_var(info);
496         return 0;
497 }
498
499 static void schedule_palette_update(struct s3c2410fb_info *fbi,
500                                     unsigned int regno, unsigned int val)
501 {
502         unsigned long flags;
503         unsigned long irqen;
504         void __iomem *regs = fbi->io;
505
506         local_irq_save(flags);
507
508         fbi->palette_buffer[regno] = val;
509
510         if (!fbi->palette_ready) {
511                 fbi->palette_ready = 1;
512
513                 /* enable IRQ */
514                 irqen = readl(regs + S3C2410_LCDINTMSK);
515                 irqen &= ~S3C2410_LCDINT_FRSYNC;
516                 writel(irqen, regs + S3C2410_LCDINTMSK);
517         }
518
519         local_irq_restore(flags);
520 }
521
522 /* from pxafb.c */
523 static inline unsigned int chan_to_field(unsigned int chan,
524                                          struct fb_bitfield *bf)
525 {
526         chan &= 0xffff;
527         chan >>= 16 - bf->length;
528         return chan << bf->offset;
529 }
530
531 static int s3c2410fb_setcolreg(unsigned regno,
532                                unsigned red, unsigned green, unsigned blue,
533                                unsigned transp, struct fb_info *info)
534 {
535         struct s3c2410fb_info *fbi = info->par;
536         void __iomem *regs = fbi->io;
537         unsigned int val;
538
539         /* dprintk("setcol: regno=%d, rgb=%d,%d,%d\n",
540                    regno, red, green, blue); */
541
542         switch (info->fix.visual) {
543         case FB_VISUAL_TRUECOLOR:
544                 /* true-colour, use pseudo-palette */
545
546                 if (regno < 16) {
547                         u32 *pal = info->pseudo_palette;
548
549                         val  = chan_to_field(red,   &info->var.red);
550                         val |= chan_to_field(green, &info->var.green);
551                         val |= chan_to_field(blue,  &info->var.blue);
552
553                         pal[regno] = val;
554                 }
555                 break;
556
557         case FB_VISUAL_PSEUDOCOLOR:
558                 if (regno < 256) {
559                         /* currently assume RGB 5-6-5 mode */
560
561                         val  = (red   >>  0) & 0xf800;
562                         val |= (green >>  5) & 0x07e0;
563                         val |= (blue  >> 11) & 0x001f;
564
565                         writel(val, regs + S3C2410_TFTPAL(regno));
566                         schedule_palette_update(fbi, regno, val);
567                 }
568
569                 break;
570
571         default:
572                 return 1;       /* unknown type */
573         }
574
575         return 0;
576 }
577
578 /*
579  *      s3c2410fb_blank
580  *      @blank_mode: the blank mode we want.
581  *      @info: frame buffer structure that represents a single frame buffer
582  *
583  *      Blank the screen if blank_mode != 0, else unblank. Return 0 if
584  *      blanking succeeded, != 0 if un-/blanking failed due to e.g. a
585  *      video mode which doesn't support it. Implements VESA suspend
586  *      and powerdown modes on hardware that supports disabling hsync/vsync:
587  *      blank_mode == 2: suspend vsync
588  *      blank_mode == 3: suspend hsync
589  *      blank_mode == 4: powerdown
590  *
591  *      Returns negative errno on error, or zero on success.
592  *
593  */
594 static int s3c2410fb_blank(int blank_mode, struct fb_info *info)
595 {
596         struct s3c2410fb_info *fbi = info->par;
597         void __iomem *regs = fbi->io;
598
599         dprintk("blank(mode=%d, info=%p)\n", blank_mode, info);
600
601         if (blank_mode == FB_BLANK_UNBLANK)
602                 writel(0x0, regs + S3C2410_TPAL);
603         else {
604                 dprintk("setting TPAL to output 0x000000\n");
605                 writel(S3C2410_TPAL_EN, regs + S3C2410_TPAL);
606         }
607
608         return 0;
609 }
610
611 static int s3c2410fb_debug_show(struct device *dev,
612                                 struct device_attribute *attr, char *buf)
613 {
614         return snprintf(buf, PAGE_SIZE, "%s\n", debug ? "on" : "off");
615 }
616
617 static int s3c2410fb_debug_store(struct device *dev,
618                                  struct device_attribute *attr,
619                                  const char *buf, size_t len)
620 {
621         if (len < 1)
622                 return -EINVAL;
623
624         if (strnicmp(buf, "on", 2) == 0 ||
625             strnicmp(buf, "1", 1) == 0) {
626                 debug = 1;
627                 printk(KERN_DEBUG "s3c2410fb: Debug On");
628         } else if (strnicmp(buf, "off", 3) == 0 ||
629                    strnicmp(buf, "0", 1) == 0) {
630                 debug = 0;
631                 printk(KERN_DEBUG "s3c2410fb: Debug Off");
632         } else {
633                 return -EINVAL;
634         }
635
636         return len;
637 }
638
639 static DEVICE_ATTR(debug, 0666, s3c2410fb_debug_show, s3c2410fb_debug_store);
640
641 static struct fb_ops s3c2410fb_ops = {
642         .owner          = THIS_MODULE,
643         .fb_check_var   = s3c2410fb_check_var,
644         .fb_set_par     = s3c2410fb_set_par,
645         .fb_blank       = s3c2410fb_blank,
646         .fb_setcolreg   = s3c2410fb_setcolreg,
647         .fb_fillrect    = cfb_fillrect,
648         .fb_copyarea    = cfb_copyarea,
649         .fb_imageblit   = cfb_imageblit,
650 };
651
652 /*
653  * s3c2410fb_map_video_memory():
654  *      Allocates the DRAM memory for the frame buffer.  This buffer is
655  *      remapped into a non-cached, non-buffered, memory region to
656  *      allow palette and pixel writes to occur without flushing the
657  *      cache.  Once this area is remapped, all virtual memory
658  *      access to the video memory should occur at the new region.
659  */
660 static int __init s3c2410fb_map_video_memory(struct fb_info *info)
661 {
662         struct s3c2410fb_info *fbi = info->par;
663         dma_addr_t map_dma;
664         unsigned map_size = PAGE_ALIGN(info->fix.smem_len);
665
666         dprintk("map_video_memory(fbi=%p)\n", fbi);
667
668         info->screen_base = dma_alloc_writecombine(fbi->dev, map_size,
669                                                    &map_dma, GFP_KERNEL);
670
671         if (info->screen_base) {
672                 /* prevent initial garbage on screen */
673                 dprintk("map_video_memory: clear %p:%08x\n",
674                         info->screen_base, map_size);
675                 memset(info->screen_base, 0xf0, map_size);
676
677                 info->fix.smem_start = map_dma;
678
679                 dprintk("map_video_memory: dma=%08lx cpu=%p size=%08x\n",
680                         info->fix.smem_start, info->screen_base, map_size);
681         }
682
683         return info->screen_base ? 0 : -ENOMEM;
684 }
685
686 static inline void s3c2410fb_unmap_video_memory(struct fb_info *info)
687 {
688         struct s3c2410fb_info *fbi = info->par;
689
690         dma_free_writecombine(fbi->dev, PAGE_ALIGN(info->fix.smem_len),
691                               info->screen_base, info->fix.smem_start);
692 }
693
694 static inline void modify_gpio(void __iomem *reg,
695                                unsigned long set, unsigned long mask)
696 {
697         unsigned long tmp;
698
699         tmp = readl(reg) & ~mask;
700         writel(tmp | set, reg);
701 }
702
703 /*
704  * s3c2410fb_init_registers - Initialise all LCD-related registers
705  */
706 static int s3c2410fb_init_registers(struct fb_info *info)
707 {
708         struct s3c2410fb_info *fbi = info->par;
709         struct s3c2410fb_mach_info *mach_info = fbi->dev->platform_data;
710         unsigned long flags;
711         void __iomem *regs = fbi->io;
712
713         /* Initialise LCD with values from haret */
714
715         local_irq_save(flags);
716
717         /* modify the gpio(s) with interrupts set (bjd) */
718
719         modify_gpio(S3C2410_GPCUP,  mach_info->gpcup,  mach_info->gpcup_mask);
720         modify_gpio(S3C2410_GPCCON, mach_info->gpccon, mach_info->gpccon_mask);
721         modify_gpio(S3C2410_GPDUP,  mach_info->gpdup,  mach_info->gpdup_mask);
722         modify_gpio(S3C2410_GPDCON, mach_info->gpdcon, mach_info->gpdcon_mask);
723
724         local_irq_restore(flags);
725
726         dprintk("LPCSEL    = 0x%08lx\n", mach_info->lpcsel);
727         writel(mach_info->lpcsel, regs + S3C2410_LPCSEL);
728
729         dprintk("replacing TPAL %08x\n", readl(regs + S3C2410_TPAL));
730
731         /* ensure temporary palette disabled */
732         writel(0x00, regs + S3C2410_TPAL);
733
734         return 0;
735 }
736
737 static void s3c2410fb_write_palette(struct s3c2410fb_info *fbi)
738 {
739         unsigned int i;
740         void __iomem *regs = fbi->io;
741
742         fbi->palette_ready = 0;
743
744         for (i = 0; i < 256; i++) {
745                 unsigned long ent = fbi->palette_buffer[i];
746                 if (ent == PALETTE_BUFF_CLEAR)
747                         continue;
748
749                 writel(ent, regs + S3C2410_TFTPAL(i));
750
751                 /* it seems the only way to know exactly
752                  * if the palette wrote ok, is to check
753                  * to see if the value verifies ok
754                  */
755
756                 if (readw(regs + S3C2410_TFTPAL(i)) == ent)
757                         fbi->palette_buffer[i] = PALETTE_BUFF_CLEAR;
758                 else
759                         fbi->palette_ready = 1;   /* retry */
760         }
761 }
762
763 static irqreturn_t s3c2410fb_irq(int irq, void *dev_id)
764 {
765         struct s3c2410fb_info *fbi = dev_id;
766         void __iomem *regs = fbi->io;
767         unsigned long lcdirq = readl(regs + S3C2410_LCDINTPND);
768
769         if (lcdirq & S3C2410_LCDINT_FRSYNC) {
770                 if (fbi->palette_ready)
771                         s3c2410fb_write_palette(fbi);
772
773                 writel(S3C2410_LCDINT_FRSYNC, regs + S3C2410_LCDINTPND);
774                 writel(S3C2410_LCDINT_FRSYNC, regs + S3C2410_LCDSRCPND);
775         }
776
777         return IRQ_HANDLED;
778 }
779
780 static char driver_name[] = "s3c2410fb";
781
782 static int __init s3c2410fb_probe(struct platform_device *pdev)
783 {
784         struct s3c2410fb_info *info;
785         struct s3c2410fb_display *display;
786         struct fb_info *fbinfo;
787         struct s3c2410fb_mach_info *mach_info;
788         struct resource *res;
789         int ret;
790         int irq;
791         int i;
792         int size;
793         u32 lcdcon1;
794
795         mach_info = pdev->dev.platform_data;
796         if (mach_info == NULL) {
797                 dev_err(&pdev->dev,
798                         "no platform data for lcd, cannot attach\n");
799                 return -EINVAL;
800         }
801
802         display = mach_info->displays + mach_info->default_display;
803
804         irq = platform_get_irq(pdev, 0);
805         if (irq < 0) {
806                 dev_err(&pdev->dev, "no irq for device\n");
807                 return -ENOENT;
808         }
809
810         fbinfo = framebuffer_alloc(sizeof(struct s3c2410fb_info), &pdev->dev);
811         if (!fbinfo)
812                 return -ENOMEM;
813
814         platform_set_drvdata(pdev, fbinfo);
815
816         info = fbinfo->par;
817         info->dev = &pdev->dev;
818
819         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
820         if (res == NULL) {
821                 dev_err(&pdev->dev, "failed to get memory registers\n");
822                 ret = -ENXIO;
823                 goto dealloc_fb;
824         }
825
826         size = (res->end - res->start) + 1;
827         info->mem = request_mem_region(res->start, size, pdev->name);
828         if (info->mem == NULL) {
829                 dev_err(&pdev->dev, "failed to get memory region\n");
830                 ret = -ENOENT;
831                 goto dealloc_fb;
832         }
833
834         info->io = ioremap(res->start, size);
835         if (info->io == NULL) {
836                 dev_err(&pdev->dev, "ioremap() of registers failed\n");
837                 ret = -ENXIO;
838                 goto release_mem;
839         }
840
841         dprintk("devinit\n");
842
843         strcpy(fbinfo->fix.id, driver_name);
844
845         /* Stop the video */
846         lcdcon1 = readl(info->io + S3C2410_LCDCON1);
847         writel(lcdcon1 & ~S3C2410_LCDCON1_ENVID, info->io + S3C2410_LCDCON1);
848
849         fbinfo->fix.type            = FB_TYPE_PACKED_PIXELS;
850         fbinfo->fix.type_aux        = 0;
851         fbinfo->fix.xpanstep        = 0;
852         fbinfo->fix.ypanstep        = 0;
853         fbinfo->fix.ywrapstep       = 0;
854         fbinfo->fix.accel           = FB_ACCEL_NONE;
855
856         fbinfo->var.nonstd          = 0;
857         fbinfo->var.activate        = FB_ACTIVATE_NOW;
858         fbinfo->var.accel_flags     = 0;
859         fbinfo->var.vmode           = FB_VMODE_NONINTERLACED;
860
861         fbinfo->fbops               = &s3c2410fb_ops;
862         fbinfo->flags               = FBINFO_FLAG_DEFAULT;
863         fbinfo->pseudo_palette      = &info->pseudo_pal;
864
865         for (i = 0; i < 256; i++)
866                 info->palette_buffer[i] = PALETTE_BUFF_CLEAR;
867
868         ret = request_irq(irq, s3c2410fb_irq, IRQF_DISABLED, pdev->name, info);
869         if (ret) {
870                 dev_err(&pdev->dev, "cannot get irq %d - err %d\n", irq, ret);
871                 ret = -EBUSY;
872                 goto release_regs;
873         }
874
875         info->clk = clk_get(NULL, "lcd");
876         if (!info->clk || IS_ERR(info->clk)) {
877                 printk(KERN_ERR "failed to get lcd clock source\n");
878                 ret = -ENOENT;
879                 goto release_irq;
880         }
881
882         clk_enable(info->clk);
883         dprintk("got and enabled clock\n");
884
885         msleep(1);
886
887         /* find maximum required memory size for display */
888         for (i = 0; i < mach_info->num_displays; i++) {
889                 unsigned long smem_len = mach_info->displays[i].xres;
890
891                 smem_len *= mach_info->displays[i].yres;
892                 smem_len *= mach_info->displays[i].bpp;
893                 smem_len >>= 3;
894                 if (fbinfo->fix.smem_len < smem_len)
895                         fbinfo->fix.smem_len = smem_len;
896         }
897
898         /* Initialize video memory */
899         ret = s3c2410fb_map_video_memory(fbinfo);
900         if (ret) {
901                 printk(KERN_ERR "Failed to allocate video RAM: %d\n", ret);
902                 ret = -ENOMEM;
903                 goto release_clock;
904         }
905
906         dprintk("got video memory\n");
907
908         fbinfo->var.xres = display->xres;
909         fbinfo->var.yres = display->yres;
910         fbinfo->var.bits_per_pixel = display->bpp;
911
912         s3c2410fb_init_registers(fbinfo);
913
914         s3c2410fb_check_var(&fbinfo->var, fbinfo);
915
916         ret = register_framebuffer(fbinfo);
917         if (ret < 0) {
918                 printk(KERN_ERR "Failed to register framebuffer device: %d\n",
919                         ret);
920                 goto free_video_memory;
921         }
922
923         /* create device files */
924         device_create_file(&pdev->dev, &dev_attr_debug);
925
926         printk(KERN_INFO "fb%d: %s frame buffer device\n",
927                 fbinfo->node, fbinfo->fix.id);
928
929         return 0;
930
931 free_video_memory:
932         s3c2410fb_unmap_video_memory(fbinfo);
933 release_clock:
934         clk_disable(info->clk);
935         clk_put(info->clk);
936 release_irq:
937         free_irq(irq, info);
938 release_regs:
939         iounmap(info->io);
940 release_mem:
941         release_resource(info->mem);
942         kfree(info->mem);
943 dealloc_fb:
944         platform_set_drvdata(pdev, NULL);
945         framebuffer_release(fbinfo);
946         return ret;
947 }
948
949 /* s3c2410fb_stop_lcd
950  *
951  * shutdown the lcd controller
952  */
953 static void s3c2410fb_stop_lcd(struct s3c2410fb_info *fbi)
954 {
955         unsigned long flags;
956
957         local_irq_save(flags);
958
959         fbi->regs.lcdcon1 &= ~S3C2410_LCDCON1_ENVID;
960         writel(fbi->regs.lcdcon1, fbi->io + S3C2410_LCDCON1);
961
962         local_irq_restore(flags);
963 }
964
965 /*
966  *  Cleanup
967  */
968 static int s3c2410fb_remove(struct platform_device *pdev)
969 {
970         struct fb_info *fbinfo = platform_get_drvdata(pdev);
971         struct s3c2410fb_info *info = fbinfo->par;
972         int irq;
973
974         unregister_framebuffer(fbinfo);
975
976         s3c2410fb_stop_lcd(info);
977         msleep(1);
978
979         s3c2410fb_unmap_video_memory(fbinfo);
980
981         if (info->clk) {
982                 clk_disable(info->clk);
983                 clk_put(info->clk);
984                 info->clk = NULL;
985         }
986
987         irq = platform_get_irq(pdev, 0);
988         free_irq(irq, info);
989
990         iounmap(info->io);
991
992         release_resource(info->mem);
993         kfree(info->mem);
994
995         platform_set_drvdata(pdev, NULL);
996         framebuffer_release(fbinfo);
997
998         return 0;
999 }
1000
1001 #ifdef CONFIG_PM
1002
1003 /* suspend and resume support for the lcd controller */
1004 static int s3c2410fb_suspend(struct platform_device *dev, pm_message_t state)
1005 {
1006         struct fb_info     *fbinfo = platform_get_drvdata(dev);
1007         struct s3c2410fb_info *info = fbinfo->par;
1008
1009         s3c2410fb_stop_lcd(info);
1010
1011         /* sleep before disabling the clock, we need to ensure
1012          * the LCD DMA engine is not going to get back on the bus
1013          * before the clock goes off again (bjd) */
1014
1015         msleep(1);
1016         clk_disable(info->clk);
1017
1018         return 0;
1019 }
1020
1021 static int s3c2410fb_resume(struct platform_device *dev)
1022 {
1023         struct fb_info     *fbinfo = platform_get_drvdata(dev);
1024         struct s3c2410fb_info *info = fbinfo->par;
1025
1026         clk_enable(info->clk);
1027         msleep(1);
1028
1029         s3c2410fb_init_registers(fbinfo);
1030
1031         return 0;
1032 }
1033
1034 #else
1035 #define s3c2410fb_suspend NULL
1036 #define s3c2410fb_resume  NULL
1037 #endif
1038
1039 static struct platform_driver s3c2410fb_driver = {
1040         .probe          = s3c2410fb_probe,
1041         .remove         = s3c2410fb_remove,
1042         .suspend        = s3c2410fb_suspend,
1043         .resume         = s3c2410fb_resume,
1044         .driver         = {
1045                 .name   = "s3c2410-lcd",
1046                 .owner  = THIS_MODULE,
1047         },
1048 };
1049
1050 int __init s3c2410fb_init(void)
1051 {
1052         return platform_driver_register(&s3c2410fb_driver);
1053 }
1054
1055 static void __exit s3c2410fb_cleanup(void)
1056 {
1057         platform_driver_unregister(&s3c2410fb_driver);
1058 }
1059
1060 module_init(s3c2410fb_init);
1061 module_exit(s3c2410fb_cleanup);
1062
1063 MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>, "
1064               "Ben Dooks <ben-linux@fluff.org>");
1065 MODULE_DESCRIPTION("Framebuffer driver for the s3c2410");
1066 MODULE_LICENSE("GPL");