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s3c2410_fb: fix line length calculation
[wrt350n-kernel.git] / drivers / video / s3c2410fb.c
blobb3c31d9dc591bc1c8e4780e9e086ec5254834a32
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");
WRT350N Kernel Patches