d574dd3c9c8aabe3f9f779dff79cb36aa85d9e07
[linux-3.10.git] / 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 mesaages
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 exist
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/tty.h>
80 #include <linux/slab.h>
81 #include <linux/delay.h>
82 #include <linux/fb.h>
83 #include <linux/init.h>
84 #include <linux/dma-mapping.h>
85 #include <linux/string.h>
86 #include <linux/interrupt.h>
87 #include <linux/workqueue.h>
88 #include <linux/wait.h>
89 #include <linux/platform_device.h>
90 #include <linux/clk.h>
91
92 #include <asm/io.h>
93 #include <asm/uaccess.h>
94 #include <asm/div64.h>
95
96 #include <asm/mach/map.h>
97 #include <asm/arch/regs-lcd.h>
98 #include <asm/arch/regs-gpio.h>
99 #include <asm/arch/fb.h>
100
101 #ifdef CONFIG_PM
102 #include <linux/pm.h>
103 #endif
104
105 #include "s3c2410fb.h"
106
107
108 static struct s3c2410fb_mach_info *mach_info;
109
110 /* Debugging stuff */
111 #ifdef CONFIG_FB_S3C2410_DEBUG
112 static int debug           = 1;
113 #else
114 static int debug           = 0;
115 #endif
116
117 #define dprintk(msg...) if (debug) { printk(KERN_DEBUG "s3c2410fb: " msg); }
118
119 /* useful functions */
120
121 /* s3c2410fb_set_lcdaddr
122  *
123  * initialise lcd controller address pointers
124 */
125
126 static void s3c2410fb_set_lcdaddr(struct s3c2410fb_info *fbi)
127 {
128         struct fb_var_screeninfo *var = &fbi->fb->var;
129         unsigned long saddr1, saddr2, saddr3;
130
131         saddr1  = fbi->fb->fix.smem_start >> 1;
132         saddr2  = fbi->fb->fix.smem_start;
133         saddr2 += (var->xres * var->yres * var->bits_per_pixel)/8;
134         saddr2>>= 1;
135
136         saddr3 =  S3C2410_OFFSIZE(0) | S3C2410_PAGEWIDTH(var->xres);
137
138         dprintk("LCDSADDR1 = 0x%08lx\n", saddr1);
139         dprintk("LCDSADDR2 = 0x%08lx\n", saddr2);
140         dprintk("LCDSADDR3 = 0x%08lx\n", saddr3);
141
142         writel(saddr1, S3C2410_LCDSADDR1);
143         writel(saddr2, S3C2410_LCDSADDR2);
144         writel(saddr3, S3C2410_LCDSADDR3);
145 }
146
147 /* s3c2410fb_calc_pixclk()
148  *
149  * calculate divisor for clk->pixclk
150 */
151
152 static unsigned int s3c2410fb_calc_pixclk(struct s3c2410fb_info *fbi,
153                                           unsigned long pixclk)
154 {
155         unsigned long clk = clk_get_rate(fbi->clk);
156         unsigned long long div;
157
158         /* pixclk is in picoseoncds, our clock is in Hz
159          *
160          * Hz -> picoseconds is / 10^-12
161          */
162
163         div = (unsigned long long)clk * pixclk;
164         do_div(div,1000000UL);
165         do_div(div,1000000UL);
166
167         dprintk("pixclk %ld, divisor is %ld\n", pixclk, (long)div);
168         return div;
169 }
170
171 /*
172  *      s3c2410fb_check_var():
173  *      Get the video params out of 'var'. If a value doesn't fit, round it up,
174  *      if it's too big, return -EINVAL.
175  *
176  */
177 static int s3c2410fb_check_var(struct fb_var_screeninfo *var,
178                                struct fb_info *info)
179 {
180         struct s3c2410fb_info *fbi = info->par;
181
182         dprintk("check_var(var=%p, info=%p)\n", var, info);
183
184         /* validate x/y resolution */
185
186         if (var->yres > fbi->mach_info->yres.max)
187                 var->yres = fbi->mach_info->yres.max;
188         else if (var->yres < fbi->mach_info->yres.min)
189                 var->yres = fbi->mach_info->yres.min;
190
191         if (var->xres > fbi->mach_info->xres.max)
192                 var->yres = fbi->mach_info->xres.max;
193         else if (var->xres < fbi->mach_info->xres.min)
194                 var->xres = fbi->mach_info->xres.min;
195
196         /* validate bpp */
197
198         if (var->bits_per_pixel > fbi->mach_info->bpp.max)
199                 var->bits_per_pixel = fbi->mach_info->bpp.max;
200         else if (var->bits_per_pixel < fbi->mach_info->bpp.min)
201                 var->bits_per_pixel = fbi->mach_info->bpp.min;
202
203         /* set r/g/b positions */
204
205         if (var->bits_per_pixel == 16) {
206                 var->red.offset         = 11;
207                 var->green.offset       = 5;
208                 var->blue.offset        = 0;
209                 var->red.length         = 5;
210                 var->green.length       = 6;
211                 var->blue.length        = 5;
212                 var->transp.length      = 0;
213         } else {
214                 var->red.length         = var->bits_per_pixel;
215                 var->red.offset         = 0;
216                 var->green.length       = var->bits_per_pixel;
217                 var->green.offset       = 0;
218                 var->blue.length        = var->bits_per_pixel;
219                 var->blue.offset        = 0;
220                 var->transp.length      = 0;
221         }
222
223         return 0;
224 }
225
226 /* s3c2410fb_activate_var
227  *
228  * activate (set) the controller from the given framebuffer
229  * information
230 */
231
232 static void s3c2410fb_activate_var(struct s3c2410fb_info *fbi,
233                                    struct fb_var_screeninfo *var)
234 {
235         fbi->regs.lcdcon1 &= ~S3C2410_LCDCON1_MODEMASK;
236
237         dprintk("%s: var->xres  = %d\n", __FUNCTION__, var->xres);
238         dprintk("%s: var->yres  = %d\n", __FUNCTION__, var->yres);
239         dprintk("%s: var->bpp   = %d\n", __FUNCTION__, var->bits_per_pixel);
240
241         switch (var->bits_per_pixel) {
242         case 1:
243                 fbi->regs.lcdcon1 |= S3C2410_LCDCON1_TFT1BPP;
244                 break;
245         case 2:
246                 fbi->regs.lcdcon1 |= S3C2410_LCDCON1_TFT2BPP;
247                 break;
248         case 4:
249                 fbi->regs.lcdcon1 |= S3C2410_LCDCON1_TFT4BPP;
250                 break;
251         case 8:
252                 fbi->regs.lcdcon1 |= S3C2410_LCDCON1_TFT8BPP;
253                 break;
254         case 16:
255                 fbi->regs.lcdcon1 |= S3C2410_LCDCON1_TFT16BPP;
256                 break;
257         }
258
259         /* check to see if we need to update sync/borders */
260
261         if (!fbi->mach_info->fixed_syncs) {
262                 dprintk("setting vert: up=%d, low=%d, sync=%d\n",
263                         var->upper_margin, var->lower_margin,
264                         var->vsync_len);
265
266                 dprintk("setting horz: lft=%d, rt=%d, sync=%d\n",
267                         var->left_margin, var->right_margin,
268                         var->hsync_len);
269
270                 fbi->regs.lcdcon2 =
271                         S3C2410_LCDCON2_VBPD(var->upper_margin - 1) |
272                         S3C2410_LCDCON2_VFPD(var->lower_margin - 1) |
273                         S3C2410_LCDCON2_VSPW(var->vsync_len - 1);
274
275                 fbi->regs.lcdcon3 =
276                         S3C2410_LCDCON3_HBPD(var->right_margin - 1) |
277                         S3C2410_LCDCON3_HFPD(var->left_margin - 1);
278
279                 fbi->regs.lcdcon4 &= ~S3C2410_LCDCON4_HSPW(0xff);
280                 fbi->regs.lcdcon4 |=  S3C2410_LCDCON4_HSPW(var->hsync_len - 1);
281         }
282
283         /* update X/Y info */
284
285         fbi->regs.lcdcon2 &= ~S3C2410_LCDCON2_LINEVAL(0x3ff);
286         fbi->regs.lcdcon2 |=  S3C2410_LCDCON2_LINEVAL(var->yres - 1);
287
288         fbi->regs.lcdcon3 &= ~S3C2410_LCDCON3_HOZVAL(0x7ff);
289         fbi->regs.lcdcon3 |=  S3C2410_LCDCON3_HOZVAL(var->xres - 1);
290
291         if (var->pixclock > 0) {
292                 int clkdiv = s3c2410fb_calc_pixclk(fbi, var->pixclock);
293
294                 clkdiv = (clkdiv / 2) -1;
295                 if (clkdiv < 0)
296                         clkdiv = 0;
297
298                 fbi->regs.lcdcon1 &= ~S3C2410_LCDCON1_CLKVAL(0x3ff);
299                 fbi->regs.lcdcon1 |=  S3C2410_LCDCON1_CLKVAL(clkdiv);
300         }
301
302         /* write new registers */
303
304         dprintk("new register set:\n");
305         dprintk("lcdcon[1] = 0x%08lx\n", fbi->regs.lcdcon1);
306         dprintk("lcdcon[2] = 0x%08lx\n", fbi->regs.lcdcon2);
307         dprintk("lcdcon[3] = 0x%08lx\n", fbi->regs.lcdcon3);
308         dprintk("lcdcon[4] = 0x%08lx\n", fbi->regs.lcdcon4);
309         dprintk("lcdcon[5] = 0x%08lx\n", fbi->regs.lcdcon5);
310
311         writel(fbi->regs.lcdcon1 & ~S3C2410_LCDCON1_ENVID, S3C2410_LCDCON1);
312         writel(fbi->regs.lcdcon2, S3C2410_LCDCON2);
313         writel(fbi->regs.lcdcon3, S3C2410_LCDCON3);
314         writel(fbi->regs.lcdcon4, S3C2410_LCDCON4);
315         writel(fbi->regs.lcdcon5, S3C2410_LCDCON5);
316
317         /* set lcd address pointers */
318         s3c2410fb_set_lcdaddr(fbi);
319
320         writel(fbi->regs.lcdcon1, S3C2410_LCDCON1);
321 }
322
323
324 /*
325  *      s3c2410fb_set_par - Optional function. Alters the hardware state.
326  *      @info: frame buffer structure that represents a single frame buffer
327  *
328  */
329 static int s3c2410fb_set_par(struct fb_info *info)
330 {
331         struct s3c2410fb_info *fbi = info->par;
332         struct fb_var_screeninfo *var = &info->var;
333
334         if (var->bits_per_pixel == 16)
335                 fbi->fb->fix.visual = FB_VISUAL_TRUECOLOR;
336         else
337                 fbi->fb->fix.visual = FB_VISUAL_PSEUDOCOLOR;
338
339         fbi->fb->fix.line_length     = (var->width*var->bits_per_pixel)/8;
340
341         /* activate this new configuration */
342
343         s3c2410fb_activate_var(fbi, var);
344         return 0;
345 }
346
347 static void schedule_palette_update(struct s3c2410fb_info *fbi,
348                                     unsigned int regno, unsigned int val)
349 {
350         unsigned long flags;
351         unsigned long irqen;
352
353         local_irq_save(flags);
354
355         fbi->palette_buffer[regno] = val;
356
357         if (!fbi->palette_ready) {
358                 fbi->palette_ready = 1;
359
360                 /* enable IRQ */
361                 irqen = readl(S3C2410_LCDINTMSK);
362                 irqen &= ~S3C2410_LCDINT_FRSYNC;
363                 writel(irqen, S3C2410_LCDINTMSK);
364         }
365
366         local_irq_restore(flags);
367 }
368
369 /* from pxafb.c */
370 static inline unsigned int chan_to_field(unsigned int chan, struct fb_bitfield *bf)
371 {
372         chan &= 0xffff;
373         chan >>= 16 - bf->length;
374         return chan << bf->offset;
375 }
376
377 static int s3c2410fb_setcolreg(unsigned regno,
378                                unsigned red, unsigned green, unsigned blue,
379                                unsigned transp, struct fb_info *info)
380 {
381         struct s3c2410fb_info *fbi = info->par;
382         unsigned int val;
383
384         /* dprintk("setcol: regno=%d, rgb=%d,%d,%d\n", regno, red, green, blue); */
385
386         switch (fbi->fb->fix.visual) {
387         case FB_VISUAL_TRUECOLOR:
388                 /* true-colour, use pseuo-palette */
389
390                 if (regno < 16) {
391                         u32 *pal = fbi->fb->pseudo_palette;
392
393                         val  = chan_to_field(red,   &fbi->fb->var.red);
394                         val |= chan_to_field(green, &fbi->fb->var.green);
395                         val |= chan_to_field(blue,  &fbi->fb->var.blue);
396
397                         pal[regno] = val;
398                 }
399                 break;
400
401         case FB_VISUAL_PSEUDOCOLOR:
402                 if (regno < 256) {
403                         /* currently assume RGB 5-6-5 mode */
404
405                         val  = ((red   >>  0) & 0xf800);
406                         val |= ((green >>  5) & 0x07e0);
407                         val |= ((blue  >> 11) & 0x001f);
408
409                         writel(val, S3C2410_TFTPAL(regno));
410                         schedule_palette_update(fbi, regno, val);
411                 }
412
413                 break;
414
415         default:
416                 return 1;   /* unknown type */
417         }
418
419         return 0;
420 }
421
422
423 /**
424  *      s3c2410fb_blank
425  *      @blank_mode: the blank mode we want.
426  *      @info: frame buffer structure that represents a single frame buffer
427  *
428  *      Blank the screen if blank_mode != 0, else unblank. Return 0 if
429  *      blanking succeeded, != 0 if un-/blanking failed due to e.g. a
430  *      video mode which doesn't support it. Implements VESA suspend
431  *      and powerdown modes on hardware that supports disabling hsync/vsync:
432  *      blank_mode == 2: suspend vsync
433  *      blank_mode == 3: suspend hsync
434  *      blank_mode == 4: powerdown
435  *
436  *      Returns negative errno on error, or zero on success.
437  *
438  */
439 static int s3c2410fb_blank(int blank_mode, struct fb_info *info)
440 {
441         dprintk("blank(mode=%d, info=%p)\n", blank_mode, info);
442
443         if (mach_info == NULL)
444                 return -EINVAL;
445
446         if (blank_mode == FB_BLANK_UNBLANK)
447                 writel(0x0, S3C2410_TPAL);
448         else {
449                 dprintk("setting TPAL to output 0x000000\n");
450                 writel(S3C2410_TPAL_EN, S3C2410_TPAL);
451         }
452
453         return 0;
454 }
455
456 static int s3c2410fb_debug_show(struct device *dev, struct device_attribute *attr, char *buf)
457 {
458         return snprintf(buf, PAGE_SIZE, "%s\n", debug ? "on" : "off");
459 }
460 static int s3c2410fb_debug_store(struct device *dev, struct device_attribute *attr,
461                                            const char *buf, size_t len)
462 {
463         if (mach_info == NULL)
464                 return -EINVAL;
465
466         if (len < 1)
467                 return -EINVAL;
468
469         if (strnicmp(buf, "on", 2) == 0 ||
470             strnicmp(buf, "1", 1) == 0) {
471                 debug = 1;
472                 printk(KERN_DEBUG "s3c2410fb: Debug On");
473         } else if (strnicmp(buf, "off", 3) == 0 ||
474                    strnicmp(buf, "0", 1) == 0) {
475                 debug = 0;
476                 printk(KERN_DEBUG "s3c2410fb: Debug Off");
477         } else {
478                 return -EINVAL;
479         }
480
481         return len;
482 }
483
484
485 static DEVICE_ATTR(debug, 0666,
486                    s3c2410fb_debug_show,
487                    s3c2410fb_debug_store);
488
489 static struct fb_ops s3c2410fb_ops = {
490         .owner          = THIS_MODULE,
491         .fb_check_var   = s3c2410fb_check_var,
492         .fb_set_par     = s3c2410fb_set_par,
493         .fb_blank       = s3c2410fb_blank,
494         .fb_setcolreg   = s3c2410fb_setcolreg,
495         .fb_fillrect    = cfb_fillrect,
496         .fb_copyarea    = cfb_copyarea,
497         .fb_imageblit   = cfb_imageblit,
498 };
499
500
501 /*
502  * s3c2410fb_map_video_memory():
503  *      Allocates the DRAM memory for the frame buffer.  This buffer is
504  *      remapped into a non-cached, non-buffered, memory region to
505  *      allow palette and pixel writes to occur without flushing the
506  *      cache.  Once this area is remapped, all virtual memory
507  *      access to the video memory should occur at the new region.
508  */
509 static int __init s3c2410fb_map_video_memory(struct s3c2410fb_info *fbi)
510 {
511         dprintk("map_video_memory(fbi=%p)\n", fbi);
512
513         fbi->map_size = PAGE_ALIGN(fbi->fb->fix.smem_len + PAGE_SIZE);
514         fbi->map_cpu  = dma_alloc_writecombine(fbi->dev, fbi->map_size,
515                                                &fbi->map_dma, GFP_KERNEL);
516
517         fbi->map_size = fbi->fb->fix.smem_len;
518
519         if (fbi->map_cpu) {
520                 /* prevent initial garbage on screen */
521                 dprintk("map_video_memory: clear %p:%08x\n",
522                         fbi->map_cpu, fbi->map_size);
523                 memset(fbi->map_cpu, 0xf0, fbi->map_size);
524
525                 fbi->screen_dma         = fbi->map_dma;
526                 fbi->fb->screen_base    = fbi->map_cpu;
527                 fbi->fb->fix.smem_start  = fbi->screen_dma;
528
529                 dprintk("map_video_memory: dma=%08x cpu=%p size=%08x\n",
530                         fbi->map_dma, fbi->map_cpu, fbi->fb->fix.smem_len);
531         }
532
533         return fbi->map_cpu ? 0 : -ENOMEM;
534 }
535
536 static inline void s3c2410fb_unmap_video_memory(struct s3c2410fb_info *fbi)
537 {
538         dma_free_writecombine(fbi->dev,fbi->map_size,fbi->map_cpu, fbi->map_dma);
539 }
540
541 static inline void modify_gpio(void __iomem *reg,
542                                unsigned long set, unsigned long mask)
543 {
544         unsigned long tmp;
545
546         tmp = readl(reg) & ~mask;
547         writel(tmp | set, reg);
548 }
549
550
551 /*
552  * s3c2410fb_init_registers - Initialise all LCD-related registers
553  */
554
555 static int s3c2410fb_init_registers(struct s3c2410fb_info *fbi)
556 {
557         unsigned long flags;
558
559         /* Initialise LCD with values from haret */
560
561         local_irq_save(flags);
562
563         /* modify the gpio(s) with interrupts set (bjd) */
564
565         modify_gpio(S3C2410_GPCUP,  mach_info->gpcup,  mach_info->gpcup_mask);
566         modify_gpio(S3C2410_GPCCON, mach_info->gpccon, mach_info->gpccon_mask);
567         modify_gpio(S3C2410_GPDUP,  mach_info->gpdup,  mach_info->gpdup_mask);
568         modify_gpio(S3C2410_GPDCON, mach_info->gpdcon, mach_info->gpdcon_mask);
569
570         local_irq_restore(flags);
571
572         writel(fbi->regs.lcdcon1, S3C2410_LCDCON1);
573         writel(fbi->regs.lcdcon2, S3C2410_LCDCON2);
574         writel(fbi->regs.lcdcon3, S3C2410_LCDCON3);
575         writel(fbi->regs.lcdcon4, S3C2410_LCDCON4);
576         writel(fbi->regs.lcdcon5, S3C2410_LCDCON5);
577
578         s3c2410fb_set_lcdaddr(fbi);
579
580         dprintk("LPCSEL    = 0x%08lx\n", mach_info->lpcsel);
581         writel(mach_info->lpcsel, S3C2410_LPCSEL);
582
583         dprintk("replacing TPAL %08x\n", readl(S3C2410_TPAL));
584
585         /* ensure temporary palette disabled */
586         writel(0x00, S3C2410_TPAL);
587
588         /* Enable video by setting the ENVID bit to 1 */
589         fbi->regs.lcdcon1 |= S3C2410_LCDCON1_ENVID;
590         writel(fbi->regs.lcdcon1, S3C2410_LCDCON1);
591         return 0;
592 }
593
594 static void s3c2410fb_write_palette(struct s3c2410fb_info *fbi)
595 {
596         unsigned int i;
597         unsigned long ent;
598
599         fbi->palette_ready = 0;
600
601         for (i = 0; i < 256; i++) {
602                 if ((ent = fbi->palette_buffer[i]) == PALETTE_BUFF_CLEAR)
603                         continue;
604
605                 writel(ent, S3C2410_TFTPAL(i));
606
607                 /* it seems the only way to know exactly
608                  * if the palette wrote ok, is to check
609                  * to see if the value verifies ok
610                  */
611
612                 if (readw(S3C2410_TFTPAL(i)) == ent)
613                         fbi->palette_buffer[i] = PALETTE_BUFF_CLEAR;
614                 else
615                         fbi->palette_ready = 1;   /* retry */
616         }
617 }
618
619 static irqreturn_t s3c2410fb_irq(int irq, void *dev_id, struct pt_regs *r)
620 {
621         struct s3c2410fb_info *fbi = dev_id;
622         unsigned long lcdirq = readl(S3C2410_LCDINTPND);
623
624         if (lcdirq & S3C2410_LCDINT_FRSYNC) {
625                 if (fbi->palette_ready)
626                         s3c2410fb_write_palette(fbi);
627
628                 writel(S3C2410_LCDINT_FRSYNC, S3C2410_LCDINTPND);
629                 writel(S3C2410_LCDINT_FRSYNC, S3C2410_LCDSRCPND);
630         }
631
632         return IRQ_HANDLED;
633 }
634
635 static char driver_name[]="s3c2410fb";
636
637 static int __init s3c2410fb_probe(struct platform_device *pdev)
638 {
639         struct s3c2410fb_info *info;
640         struct fb_info     *fbinfo;
641         struct s3c2410fb_hw *mregs;
642         int ret;
643         int irq;
644         int i;
645
646         mach_info = pdev->dev.platform_data;
647         if (mach_info == NULL) {
648                 dev_err(&pdev->dev,"no platform data for lcd, cannot attach\n");
649                 return -EINVAL;
650         }
651
652         mregs = &mach_info->regs;
653
654         irq = platform_get_irq(pdev, 0);
655         if (irq < 0) {
656                 dev_err(&pdev->dev, "no irq for device\n");
657                 return -ENOENT;
658         }
659
660         fbinfo = framebuffer_alloc(sizeof(struct s3c2410fb_info), &pdev->dev);
661         if (!fbinfo) {
662                 return -ENOMEM;
663         }
664
665
666         info = fbinfo->par;
667         info->fb = fbinfo;
668         platform_set_drvdata(pdev, fbinfo);
669
670         dprintk("devinit\n");
671
672         strcpy(fbinfo->fix.id, driver_name);
673
674         memcpy(&info->regs, &mach_info->regs, sizeof(info->regs));
675
676         info->mach_info             = pdev->dev.platform_data;
677
678         fbinfo->fix.type            = FB_TYPE_PACKED_PIXELS;
679         fbinfo->fix.type_aux        = 0;
680         fbinfo->fix.xpanstep        = 0;
681         fbinfo->fix.ypanstep        = 0;
682         fbinfo->fix.ywrapstep       = 0;
683         fbinfo->fix.accel           = FB_ACCEL_NONE;
684
685         fbinfo->var.nonstd          = 0;
686         fbinfo->var.activate        = FB_ACTIVATE_NOW;
687         fbinfo->var.height          = mach_info->height;
688         fbinfo->var.width           = mach_info->width;
689         fbinfo->var.accel_flags     = 0;
690         fbinfo->var.vmode           = FB_VMODE_NONINTERLACED;
691
692         fbinfo->fbops               = &s3c2410fb_ops;
693         fbinfo->flags               = FBINFO_FLAG_DEFAULT;
694         fbinfo->pseudo_palette      = &info->pseudo_pal;
695
696         fbinfo->var.xres            = mach_info->xres.defval;
697         fbinfo->var.xres_virtual    = mach_info->xres.defval;
698         fbinfo->var.yres            = mach_info->yres.defval;
699         fbinfo->var.yres_virtual    = mach_info->yres.defval;
700         fbinfo->var.bits_per_pixel  = mach_info->bpp.defval;
701
702         fbinfo->var.upper_margin    = S3C2410_LCDCON2_GET_VBPD(mregs->lcdcon2) + 1;
703         fbinfo->var.lower_margin    = S3C2410_LCDCON2_GET_VFPD(mregs->lcdcon2) + 1;
704         fbinfo->var.vsync_len       = S3C2410_LCDCON2_GET_VSPW(mregs->lcdcon2) + 1;
705
706         fbinfo->var.left_margin     = S3C2410_LCDCON3_GET_HFPD(mregs->lcdcon3) + 1;
707         fbinfo->var.right_margin    = S3C2410_LCDCON3_GET_HBPD(mregs->lcdcon3) + 1;
708         fbinfo->var.hsync_len       = S3C2410_LCDCON4_GET_HSPW(mregs->lcdcon4) + 1;
709
710         fbinfo->var.red.offset      = 11;
711         fbinfo->var.green.offset    = 5;
712         fbinfo->var.blue.offset     = 0;
713         fbinfo->var.transp.offset   = 0;
714         fbinfo->var.red.length      = 5;
715         fbinfo->var.green.length    = 6;
716         fbinfo->var.blue.length     = 5;
717         fbinfo->var.transp.length   = 0;
718         fbinfo->fix.smem_len        =   mach_info->xres.max *
719                                         mach_info->yres.max *
720                                         mach_info->bpp.max / 8;
721
722         for (i = 0; i < 256; i++)
723                 info->palette_buffer[i] = PALETTE_BUFF_CLEAR;
724
725         if (!request_mem_region((unsigned long)S3C24XX_VA_LCD, SZ_1M, "s3c2410-lcd")) {
726                 ret = -EBUSY;
727                 goto dealloc_fb;
728         }
729
730
731         dprintk("got LCD region\n");
732
733         ret = request_irq(irq, s3c2410fb_irq, SA_INTERRUPT, pdev->name, info);
734         if (ret) {
735                 dev_err(&pdev->dev, "cannot get irq %d - err %d\n", irq, ret);
736                 ret = -EBUSY;
737                 goto release_mem;
738         }
739
740         info->clk = clk_get(NULL, "lcd");
741         if (!info->clk || IS_ERR(info->clk)) {
742                 printk(KERN_ERR "failed to get lcd clock source\n");
743                 ret = -ENOENT;
744                 goto release_irq;
745         }
746
747         clk_enable(info->clk);
748         dprintk("got and enabled clock\n");
749
750         msleep(1);
751
752         /* Initialize video memory */
753         ret = s3c2410fb_map_video_memory(info);
754         if (ret) {
755                 printk( KERN_ERR "Failed to allocate video RAM: %d\n", ret);
756                 ret = -ENOMEM;
757                 goto release_clock;
758         }
759         dprintk("got video memory\n");
760
761         ret = s3c2410fb_init_registers(info);
762
763         ret = s3c2410fb_check_var(&fbinfo->var, fbinfo);
764
765         ret = register_framebuffer(fbinfo);
766         if (ret < 0) {
767                 printk(KERN_ERR "Failed to register framebuffer device: %d\n", ret);
768                 goto free_video_memory;
769         }
770
771         /* create device files */
772         device_create_file(&pdev->dev, &dev_attr_debug);
773
774         printk(KERN_INFO "fb%d: %s frame buffer device\n",
775                 fbinfo->node, fbinfo->fix.id);
776
777         return 0;
778
779 free_video_memory:
780         s3c2410fb_unmap_video_memory(info);
781 release_clock:
782         clk_disable(info->clk);
783         clk_put(info->clk);
784 release_irq:
785         free_irq(irq,info);
786 release_mem:
787         release_mem_region((unsigned long)S3C24XX_VA_LCD, S3C24XX_SZ_LCD);
788 dealloc_fb:
789         framebuffer_release(fbinfo);
790         return ret;
791 }
792
793 /* s3c2410fb_stop_lcd
794  *
795  * shutdown the lcd controller
796 */
797
798 static void s3c2410fb_stop_lcd(void)
799 {
800         unsigned long flags;
801         unsigned long tmp;
802
803         local_irq_save(flags);
804
805         tmp = readl(S3C2410_LCDCON1);
806         writel(tmp & ~S3C2410_LCDCON1_ENVID, S3C2410_LCDCON1);
807
808         local_irq_restore(flags);
809 }
810
811 /*
812  *  Cleanup
813  */
814 static int s3c2410fb_remove(struct platform_device *pdev)
815 {
816         struct fb_info     *fbinfo = platform_get_drvdata(pdev);
817         struct s3c2410fb_info *info = fbinfo->par;
818         int irq;
819
820         s3c2410fb_stop_lcd();
821         msleep(1);
822
823         s3c2410fb_unmap_video_memory(info);
824
825         if (info->clk) {
826                 clk_disable(info->clk);
827                 clk_put(info->clk);
828                 info->clk = NULL;
829         }
830
831         irq = platform_get_irq(pdev, 0);
832         free_irq(irq,info);
833         release_mem_region((unsigned long)S3C24XX_VA_LCD, S3C24XX_SZ_LCD);
834         unregister_framebuffer(fbinfo);
835
836         return 0;
837 }
838
839 #ifdef CONFIG_PM
840
841 /* suspend and resume support for the lcd controller */
842
843 static int s3c2410fb_suspend(struct platform_device *dev, pm_message_t state)
844 {
845         struct fb_info     *fbinfo = platform_get_drvdata(dev);
846         struct s3c2410fb_info *info = fbinfo->par;
847
848         s3c2410fb_stop_lcd();
849
850         /* sleep before disabling the clock, we need to ensure
851          * the LCD DMA engine is not going to get back on the bus
852          * before the clock goes off again (bjd) */
853
854         msleep(1);
855         clk_disable(info->clk);
856
857         return 0;
858 }
859
860 static int s3c2410fb_resume(struct platform_device *dev)
861 {
862         struct fb_info     *fbinfo = platform_get_drvdata(dev);
863         struct s3c2410fb_info *info = fbinfo->par;
864
865         clk_enable(info->clk);
866         msleep(1);
867
868         s3c2410fb_init_registers(info);
869
870         return 0;
871 }
872
873 #else
874 #define s3c2410fb_suspend NULL
875 #define s3c2410fb_resume  NULL
876 #endif
877
878 static struct platform_driver s3c2410fb_driver = {
879         .probe          = s3c2410fb_probe,
880         .remove         = s3c2410fb_remove,
881         .suspend        = s3c2410fb_suspend,
882         .resume         = s3c2410fb_resume,
883         .driver         = {
884                 .name   = "s3c2410-lcd",
885                 .owner  = THIS_MODULE,
886         },
887 };
888
889 int __devinit s3c2410fb_init(void)
890 {
891         return platform_driver_register(&s3c2410fb_driver);
892 }
893
894 static void __exit s3c2410fb_cleanup(void)
895 {
896         platform_driver_unregister(&s3c2410fb_driver);
897 }
898
899
900 module_init(s3c2410fb_init);
901 module_exit(s3c2410fb_cleanup);
902
903 MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>, Ben Dooks <ben-linux@fluff.org>");
904 MODULE_DESCRIPTION("Framebuffer driver for the s3c2410");
905 MODULE_LICENSE("GPL");