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x86/amd-iommu: Add per IOMMU reference counting
[linux/fpc-iii.git] / drivers / video / s3c2410fb.c
blobaac661225c78903d512fb2cb56b48095ee5f6c7a
1 /* linux/drivers/video/s3c2410fb.c
2 * Copyright (c) 2004,2005 Arnaud Patard
3 * Copyright (c) 2004-2008 Ben Dooks
4 *
5 * S3C2410 LCD Framebuffer Driver
6 *
7 * This file is subject to the terms and conditions of the GNU General Public
8 * License. See the file COPYING in the main directory of this archive for
9 * more details.
10 *
11 * Driver based on skeletonfb.c, sa1100fb.c and others.
12 */
13
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/errno.h>
17 #include <linux/string.h>
18 #include <linux/mm.h>
19 #include <linux/slab.h>
20 #include <linux/delay.h>
21 #include <linux/fb.h>
22 #include <linux/init.h>
23 #include <linux/dma-mapping.h>
24 #include <linux/interrupt.h>
25 #include <linux/platform_device.h>
26 #include <linux/clk.h>
27 #include <linux/cpufreq.h>
28
29 #include <asm/io.h>
30 #include <asm/div64.h>
31
32 #include <asm/mach/map.h>
33 #include <mach/regs-lcd.h>
34 #include <mach/regs-gpio.h>
35 #include <mach/fb.h>
36
37 #ifdef CONFIG_PM
38 #include <linux/pm.h>
39 #endif
40
41 #include "s3c2410fb.h"
42
43 /* Debugging stuff */
44 #ifdef CONFIG_FB_S3C2410_DEBUG
45 static int debug = 1;
46 #else
47 static int debug = 0;
48 #endif
49
50 #define dprintk(msg...) if (debug) { printk(KERN_DEBUG "s3c2410fb: " msg); }
51
52 /* useful functions */
53
54 static int is_s3c2412(struct s3c2410fb_info *fbi)
55 {
56 return (fbi->drv_type == DRV_S3C2412);
57 }
58
59 /* s3c2410fb_set_lcdaddr
60 *
61 * initialise lcd controller address pointers
62 */
63 static void s3c2410fb_set_lcdaddr(struct fb_info *info)
64 {
65 unsigned long saddr1, saddr2, saddr3;
66 struct s3c2410fb_info *fbi = info->par;
67 void __iomem *regs = fbi->io;
68
69 saddr1 = info->fix.smem_start >> 1;
70 saddr2 = info->fix.smem_start;
71 saddr2 += info->fix.line_length * info->var.yres;
72 saddr2 >>= 1;
73
74 saddr3 = S3C2410_OFFSIZE(0) |
75 S3C2410_PAGEWIDTH((info->fix.line_length / 2) & 0x3ff);
76
77 dprintk("LCDSADDR1 = 0x%08lx\n", saddr1);
78 dprintk("LCDSADDR2 = 0x%08lx\n", saddr2);
79 dprintk("LCDSADDR3 = 0x%08lx\n", saddr3);
80
81 writel(saddr1, regs + S3C2410_LCDSADDR1);
82 writel(saddr2, regs + S3C2410_LCDSADDR2);
83 writel(saddr3, regs + S3C2410_LCDSADDR3);
84 }
85
86 /* s3c2410fb_calc_pixclk()
87 *
88 * calculate divisor for clk->pixclk
89 */
90 static unsigned int s3c2410fb_calc_pixclk(struct s3c2410fb_info *fbi,
91 unsigned long pixclk)
92 {
93 unsigned long clk = fbi->clk_rate;
94 unsigned long long div;
95
96 /* pixclk is in picoseconds, our clock is in Hz
97 *
98 * Hz -> picoseconds is / 10^-12
99 */
100
101 div = (unsigned long long)clk * pixclk;
102 div >>= 12; /* div / 2^12 */
103 do_div(div, 625 * 625UL * 625); /* div / 5^12 */
104
105 dprintk("pixclk %ld, divisor is %ld\n", pixclk, (long)div);
106 return div;
107 }
108
109 /*
110 * s3c2410fb_check_var():
111 * Get the video params out of 'var'. If a value doesn't fit, round it up,
112 * if it's too big, return -EINVAL.
113 *
114 */
115 static int s3c2410fb_check_var(struct fb_var_screeninfo *var,
116 struct fb_info *info)
117 {
118 struct s3c2410fb_info *fbi = info->par;
119 struct s3c2410fb_mach_info *mach_info = fbi->dev->platform_data;
120 struct s3c2410fb_display *display = NULL;
121 struct s3c2410fb_display *default_display = mach_info->displays +
122 mach_info->default_display;
123 int type = default_display->type;
124 unsigned i;
125
126 dprintk("check_var(var=%p, info=%p)\n", var, info);
127
128 /* validate x/y resolution */
129 /* choose default mode if possible */
130 if (var->yres == default_display->yres &&
131 var->xres == default_display->xres &&
132 var->bits_per_pixel == default_display->bpp)
133 display = default_display;
134 else
135 for (i = 0; i < mach_info->num_displays; i++)
136 if (type == mach_info->displays[i].type &&
137 var->yres == mach_info->displays[i].yres &&
138 var->xres == mach_info->displays[i].xres &&
139 var->bits_per_pixel == mach_info->displays[i].bpp) {
140 display = mach_info->displays + i;
141 break;
142 }
143
144 if (!display) {
145 dprintk("wrong resolution or depth %dx%d at %d bpp\n",
146 var->xres, var->yres, var->bits_per_pixel);
147 return -EINVAL;
148 }
149
150 /* it is always the size as the display */
151 var->xres_virtual = display->xres;
152 var->yres_virtual = display->yres;
153 var->height = display->height;
154 var->width = display->width;
155
156 /* copy lcd settings */
157 var->pixclock = display->pixclock;
158 var->left_margin = display->left_margin;
159 var->right_margin = display->right_margin;
160 var->upper_margin = display->upper_margin;
161 var->lower_margin = display->lower_margin;
162 var->vsync_len = display->vsync_len;
163 var->hsync_len = display->hsync_len;
164
165 fbi->regs.lcdcon5 = display->lcdcon5;
166 /* set display type */
167 fbi->regs.lcdcon1 = display->type;
168
169 var->transp.offset = 0;
170 var->transp.length = 0;
171 /* set r/g/b positions */
172 switch (var->bits_per_pixel) {
173 case 1:
174 case 2:
175 case 4:
176 var->red.offset = 0;
177 var->red.length = var->bits_per_pixel;
178 var->green = var->red;
179 var->blue = var->red;
180 break;
181 case 8:
182 if (display->type != S3C2410_LCDCON1_TFT) {
183 /* 8 bpp 332 */
184 var->red.length = 3;
185 var->red.offset = 5;
186 var->green.length = 3;
187 var->green.offset = 2;
188 var->blue.length = 2;
189 var->blue.offset = 0;
190 } else {
191 var->red.offset = 0;
192 var->red.length = 8;
193 var->green = var->red;
194 var->blue = var->red;
195 }
196 break;
197 case 12:
198 /* 12 bpp 444 */
199 var->red.length = 4;
200 var->red.offset = 8;
201 var->green.length = 4;
202 var->green.offset = 4;
203 var->blue.length = 4;
204 var->blue.offset = 0;
205 break;
206
207 default:
208 case 16:
209 if (display->lcdcon5 & S3C2410_LCDCON5_FRM565) {
210 /* 16 bpp, 565 format */
211 var->red.offset = 11;
212 var->green.offset = 5;
213 var->blue.offset = 0;
214 var->red.length = 5;
215 var->green.length = 6;
216 var->blue.length = 5;
217 } else {
218 /* 16 bpp, 5551 format */
219 var->red.offset = 11;
220 var->green.offset = 6;
221 var->blue.offset = 1;
222 var->red.length = 5;
223 var->green.length = 5;
224 var->blue.length = 5;
225 }
226 break;
227 case 32:
228 /* 24 bpp 888 and 8 dummy */
229 var->red.length = 8;
230 var->red.offset = 16;
231 var->green.length = 8;
232 var->green.offset = 8;
233 var->blue.length = 8;
234 var->blue.offset = 0;
235 break;
236 }
237 return 0;
238 }
239
240 /* s3c2410fb_calculate_stn_lcd_regs
241 *
242 * calculate register values from var settings
243 */
244 static void s3c2410fb_calculate_stn_lcd_regs(const struct fb_info *info,
245 struct s3c2410fb_hw *regs)
246 {
247 const struct s3c2410fb_info *fbi = info->par;
248 const struct fb_var_screeninfo *var = &info->var;
249 int type = regs->lcdcon1 & ~S3C2410_LCDCON1_TFT;
250 int hs = var->xres >> 2;
251 unsigned wdly = (var->left_margin >> 4) - 1;
252 unsigned wlh = (var->hsync_len >> 4) - 1;
253
254 if (type != S3C2410_LCDCON1_STN4)
255 hs >>= 1;
256
257 switch (var->bits_per_pixel) {
258 case 1:
259 regs->lcdcon1 |= S3C2410_LCDCON1_STN1BPP;
260 break;
261 case 2:
262 regs->lcdcon1 |= S3C2410_LCDCON1_STN2GREY;
263 break;
264 case 4:
265 regs->lcdcon1 |= S3C2410_LCDCON1_STN4GREY;
266 break;
267 case 8:
268 regs->lcdcon1 |= S3C2410_LCDCON1_STN8BPP;
269 hs *= 3;
270 break;
271 case 12:
272 regs->lcdcon1 |= S3C2410_LCDCON1_STN12BPP;
273 hs *= 3;
274 break;
275
276 default:
277 /* invalid pixel depth */
278 dev_err(fbi->dev, "invalid bpp %d\n",
279 var->bits_per_pixel);
280 }
281 /* update X/Y info */
282 dprintk("setting horz: lft=%d, rt=%d, sync=%d\n",
283 var->left_margin, var->right_margin, var->hsync_len);
284
285 regs->lcdcon2 = S3C2410_LCDCON2_LINEVAL(var->yres - 1);
286
287 if (wdly > 3)
288 wdly = 3;
289
290 if (wlh > 3)
291 wlh = 3;
292
293 regs->lcdcon3 = S3C2410_LCDCON3_WDLY(wdly) |
294 S3C2410_LCDCON3_LINEBLANK(var->right_margin / 8) |
295 S3C2410_LCDCON3_HOZVAL(hs - 1);
296
297 regs->lcdcon4 = S3C2410_LCDCON4_WLH(wlh);
298 }
299
300 /* s3c2410fb_calculate_tft_lcd_regs
301 *
302 * calculate register values from var settings
303 */
304 static void s3c2410fb_calculate_tft_lcd_regs(const struct fb_info *info,
305 struct s3c2410fb_hw *regs)
306 {
307 const struct s3c2410fb_info *fbi = info->par;
308 const struct fb_var_screeninfo *var = &info->var;
309
310 switch (var->bits_per_pixel) {
311 case 1:
312 regs->lcdcon1 |= S3C2410_LCDCON1_TFT1BPP;
313 break;
314 case 2:
315 regs->lcdcon1 |= S3C2410_LCDCON1_TFT2BPP;
316 break;
317 case 4:
318 regs->lcdcon1 |= S3C2410_LCDCON1_TFT4BPP;
319 break;
320 case 8:
321 regs->lcdcon1 |= S3C2410_LCDCON1_TFT8BPP;
322 regs->lcdcon5 |= S3C2410_LCDCON5_BSWP |
323 S3C2410_LCDCON5_FRM565;
324 regs->lcdcon5 &= ~S3C2410_LCDCON5_HWSWP;
325 break;
326 case 16:
327 regs->lcdcon1 |= S3C2410_LCDCON1_TFT16BPP;
328 regs->lcdcon5 &= ~S3C2410_LCDCON5_BSWP;
329 regs->lcdcon5 |= S3C2410_LCDCON5_HWSWP;
330 break;
331 case 32:
332 regs->lcdcon1 |= S3C2410_LCDCON1_TFT24BPP;
333 regs->lcdcon5 &= ~(S3C2410_LCDCON5_BSWP |
334 S3C2410_LCDCON5_HWSWP |
335 S3C2410_LCDCON5_BPP24BL);
336 break;
337 default:
338 /* invalid pixel depth */
339 dev_err(fbi->dev, "invalid bpp %d\n",
340 var->bits_per_pixel);
341 }
342 /* update X/Y info */
343 dprintk("setting vert: up=%d, low=%d, sync=%d\n",
344 var->upper_margin, var->lower_margin, var->vsync_len);
345
346 dprintk("setting horz: lft=%d, rt=%d, sync=%d\n",
347 var->left_margin, var->right_margin, var->hsync_len);
348
349 regs->lcdcon2 = S3C2410_LCDCON2_LINEVAL(var->yres - 1) |
350 S3C2410_LCDCON2_VBPD(var->upper_margin - 1) |
351 S3C2410_LCDCON2_VFPD(var->lower_margin - 1) |
352 S3C2410_LCDCON2_VSPW(var->vsync_len - 1);
353
354 regs->lcdcon3 = S3C2410_LCDCON3_HBPD(var->right_margin - 1) |
355 S3C2410_LCDCON3_HFPD(var->left_margin - 1) |
356 S3C2410_LCDCON3_HOZVAL(var->xres - 1);
357
358 regs->lcdcon4 = S3C2410_LCDCON4_HSPW(var->hsync_len - 1);
359 }
360
361 /* s3c2410fb_activate_var
362 *
363 * activate (set) the controller from the given framebuffer
364 * information
365 */
366 static void s3c2410fb_activate_var(struct fb_info *info)
367 {
368 struct s3c2410fb_info *fbi = info->par;
369 void __iomem *regs = fbi->io;
370 int type = fbi->regs.lcdcon1 & S3C2410_LCDCON1_TFT;
371 struct fb_var_screeninfo *var = &info->var;
372 int clkdiv;
373
374 clkdiv = DIV_ROUND_UP(s3c2410fb_calc_pixclk(fbi, var->pixclock), 2);
375
376 dprintk("%s: var->xres = %d\n", __func__, var->xres);
377 dprintk("%s: var->yres = %d\n", __func__, var->yres);
378 dprintk("%s: var->bpp = %d\n", __func__, var->bits_per_pixel);
379
380 if (type == S3C2410_LCDCON1_TFT) {
381 s3c2410fb_calculate_tft_lcd_regs(info, &fbi->regs);
382 --clkdiv;
383 if (clkdiv < 0)
384 clkdiv = 0;
385 } else {
386 s3c2410fb_calculate_stn_lcd_regs(info, &fbi->regs);
387 if (clkdiv < 2)
388 clkdiv = 2;
389 }
390
391 fbi->regs.lcdcon1 |= S3C2410_LCDCON1_CLKVAL(clkdiv);
392
393 /* write new registers */
394
395 dprintk("new register set:\n");
396 dprintk("lcdcon[1] = 0x%08lx\n", fbi->regs.lcdcon1);
397 dprintk("lcdcon[2] = 0x%08lx\n", fbi->regs.lcdcon2);
398 dprintk("lcdcon[3] = 0x%08lx\n", fbi->regs.lcdcon3);
399 dprintk("lcdcon[4] = 0x%08lx\n", fbi->regs.lcdcon4);
400 dprintk("lcdcon[5] = 0x%08lx\n", fbi->regs.lcdcon5);
401
402 writel(fbi->regs.lcdcon1 & ~S3C2410_LCDCON1_ENVID,
403 regs + S3C2410_LCDCON1);
404 writel(fbi->regs.lcdcon2, regs + S3C2410_LCDCON2);
405 writel(fbi->regs.lcdcon3, regs + S3C2410_LCDCON3);
406 writel(fbi->regs.lcdcon4, regs + S3C2410_LCDCON4);
407 writel(fbi->regs.lcdcon5, regs + S3C2410_LCDCON5);
408
409 /* set lcd address pointers */
410 s3c2410fb_set_lcdaddr(info);
411
412 fbi->regs.lcdcon1 |= S3C2410_LCDCON1_ENVID,
413 writel(fbi->regs.lcdcon1, regs + S3C2410_LCDCON1);
414 }
415
416 /*
417 * s3c2410fb_set_par - Alters the hardware state.
418 * @info: frame buffer structure that represents a single frame buffer
419 *
420 */
421 static int s3c2410fb_set_par(struct fb_info *info)
422 {
423 struct fb_var_screeninfo *var = &info->var;
424
425 switch (var->bits_per_pixel) {
426 case 32:
427 case 16:
428 case 12:
429 info->fix.visual = FB_VISUAL_TRUECOLOR;
430 break;
431 case 1:
432 info->fix.visual = FB_VISUAL_MONO01;
433 break;
434 default:
435 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
436 break;
437 }
438
439 info->fix.line_length = (var->xres_virtual * var->bits_per_pixel) / 8;
440
441 /* activate this new configuration */
442
443 s3c2410fb_activate_var(info);
444 return 0;
445 }
446
447 static void schedule_palette_update(struct s3c2410fb_info *fbi,
448 unsigned int regno, unsigned int val)
449 {
450 unsigned long flags;
451 unsigned long irqen;
452 void __iomem *irq_base = fbi->irq_base;
453
454 local_irq_save(flags);
455
456 fbi->palette_buffer[regno] = val;
457
458 if (!fbi->palette_ready) {
459 fbi->palette_ready = 1;
460
461 /* enable IRQ */
462 irqen = readl(irq_base + S3C24XX_LCDINTMSK);
463 irqen &= ~S3C2410_LCDINT_FRSYNC;
464 writel(irqen, irq_base + S3C24XX_LCDINTMSK);
465 }
466
467 local_irq_restore(flags);
468 }
469
470 /* from pxafb.c */
471 static inline unsigned int chan_to_field(unsigned int chan,
472 struct fb_bitfield *bf)
473 {
474 chan &= 0xffff;
475 chan >>= 16 - bf->length;
476 return chan << bf->offset;
477 }
478
479 static int s3c2410fb_setcolreg(unsigned regno,
480 unsigned red, unsigned green, unsigned blue,
481 unsigned transp, struct fb_info *info)
482 {
483 struct s3c2410fb_info *fbi = info->par;
484 void __iomem *regs = fbi->io;
485 unsigned int val;
486
487 /* dprintk("setcol: regno=%d, rgb=%d,%d,%d\n",
488 regno, red, green, blue); */
489
490 switch (info->fix.visual) {
491 case FB_VISUAL_TRUECOLOR:
492 /* true-colour, use pseudo-palette */
493
494 if (regno < 16) {
495 u32 *pal = info->pseudo_palette;
496
497 val = chan_to_field(red, &info->var.red);
498 val |= chan_to_field(green, &info->var.green);
499 val |= chan_to_field(blue, &info->var.blue);
500
501 pal[regno] = val;
502 }
503 break;
504
505 case FB_VISUAL_PSEUDOCOLOR:
506 if (regno < 256) {
507 /* currently assume RGB 5-6-5 mode */
508
509 val = (red >> 0) & 0xf800;
510 val |= (green >> 5) & 0x07e0;
511 val |= (blue >> 11) & 0x001f;
512
513 writel(val, regs + S3C2410_TFTPAL(regno));
514 schedule_palette_update(fbi, regno, val);
515 }
516
517 break;
518
519 default:
520 return 1; /* unknown type */
521 }
522
523 return 0;
524 }
525
526 /* s3c2410fb_lcd_enable
527 *
528 * shutdown the lcd controller
529 */
530 static void s3c2410fb_lcd_enable(struct s3c2410fb_info *fbi, int enable)
531 {
532 unsigned long flags;
533
534 local_irq_save(flags);
535
536 if (enable)
537 fbi->regs.lcdcon1 |= S3C2410_LCDCON1_ENVID;
538 else
539 fbi->regs.lcdcon1 &= ~S3C2410_LCDCON1_ENVID;
540
541 writel(fbi->regs.lcdcon1, fbi->io + S3C2410_LCDCON1);
542
543 local_irq_restore(flags);
544 }
545
546
547 /*
548 * s3c2410fb_blank
549 * @blank_mode: the blank mode we want.
550 * @info: frame buffer structure that represents a single frame buffer
551 *
552 * Blank the screen if blank_mode != 0, else unblank. Return 0 if
553 * blanking succeeded, != 0 if un-/blanking failed due to e.g. a
554 * video mode which doesn't support it. Implements VESA suspend
555 * and powerdown modes on hardware that supports disabling hsync/vsync:
556 *
557 * Returns negative errno on error, or zero on success.
558 *
559 */
560 static int s3c2410fb_blank(int blank_mode, struct fb_info *info)
561 {
562 struct s3c2410fb_info *fbi = info->par;
563 void __iomem *tpal_reg = fbi->io;
564
565 dprintk("blank(mode=%d, info=%p)\n", blank_mode, info);
566
567 tpal_reg += is_s3c2412(fbi) ? S3C2412_TPAL : S3C2410_TPAL;
568
569 if (blank_mode == FB_BLANK_POWERDOWN) {
570 s3c2410fb_lcd_enable(fbi, 0);
571 } else {
572 s3c2410fb_lcd_enable(fbi, 1);
573 }
574
575 if (blank_mode == FB_BLANK_UNBLANK)
576 writel(0x0, tpal_reg);
577 else {
578 dprintk("setting TPAL to output 0x000000\n");
579 writel(S3C2410_TPAL_EN, tpal_reg);
580 }
581
582 return 0;
583 }
584
585 static int s3c2410fb_debug_show(struct device *dev,
586 struct device_attribute *attr, char *buf)
587 {
588 return snprintf(buf, PAGE_SIZE, "%s\n", debug ? "on" : "off");
589 }
590
591 static int s3c2410fb_debug_store(struct device *dev,
592 struct device_attribute *attr,
593 const char *buf, size_t len)
594 {
595 if (len < 1)
596 return -EINVAL;
597
598 if (strnicmp(buf, "on", 2) == 0 ||
599 strnicmp(buf, "1", 1) == 0) {
600 debug = 1;
601 printk(KERN_DEBUG "s3c2410fb: Debug On");
602 } else if (strnicmp(buf, "off", 3) == 0 ||
603 strnicmp(buf, "0", 1) == 0) {
604 debug = 0;
605 printk(KERN_DEBUG "s3c2410fb: Debug Off");
606 } else {
607 return -EINVAL;
608 }
609
610 return len;
611 }
612
613 static DEVICE_ATTR(debug, 0666, s3c2410fb_debug_show, s3c2410fb_debug_store);
614
615 static struct fb_ops s3c2410fb_ops = {
616 .owner = THIS_MODULE,
617 .fb_check_var = s3c2410fb_check_var,
618 .fb_set_par = s3c2410fb_set_par,
619 .fb_blank = s3c2410fb_blank,
620 .fb_setcolreg = s3c2410fb_setcolreg,
621 .fb_fillrect = cfb_fillrect,
622 .fb_copyarea = cfb_copyarea,
623 .fb_imageblit = cfb_imageblit,
624 };
625
626 /*
627 * s3c2410fb_map_video_memory():
628 * Allocates the DRAM memory for the frame buffer. This buffer is
629 * remapped into a non-cached, non-buffered, memory region to
630 * allow palette and pixel writes to occur without flushing the
631 * cache. Once this area is remapped, all virtual memory
632 * access to the video memory should occur at the new region.
633 */
634 static int __init s3c2410fb_map_video_memory(struct fb_info *info)
635 {
636 struct s3c2410fb_info *fbi = info->par;
637 dma_addr_t map_dma;
638 unsigned map_size = PAGE_ALIGN(info->fix.smem_len);
639
640 dprintk("map_video_memory(fbi=%p) map_size %u\n", fbi, map_size);
641
642 info->screen_base = dma_alloc_writecombine(fbi->dev, map_size,
643 &map_dma, GFP_KERNEL);
644
645 if (info->screen_base) {
646 /* prevent initial garbage on screen */
647 dprintk("map_video_memory: clear %p:%08x\n",
648 info->screen_base, map_size);
649 memset(info->screen_base, 0x00, map_size);
650
651 info->fix.smem_start = map_dma;
652
653 dprintk("map_video_memory: dma=%08lx cpu=%p size=%08x\n",
654 info->fix.smem_start, info->screen_base, map_size);
655 }
656
657 return info->screen_base ? 0 : -ENOMEM;
658 }
659
660 static inline void s3c2410fb_unmap_video_memory(struct fb_info *info)
661 {
662 struct s3c2410fb_info *fbi = info->par;
663
664 dma_free_writecombine(fbi->dev, PAGE_ALIGN(info->fix.smem_len),
665 info->screen_base, info->fix.smem_start);
666 }
667
668 static inline void modify_gpio(void __iomem *reg,
669 unsigned long set, unsigned long mask)
670 {
671 unsigned long tmp;
672
673 tmp = readl(reg) & ~mask;
674 writel(tmp | set, reg);
675 }
676
677 /*
678 * s3c2410fb_init_registers - Initialise all LCD-related registers
679 */
680 static int s3c2410fb_init_registers(struct fb_info *info)
681 {
682 struct s3c2410fb_info *fbi = info->par;
683 struct s3c2410fb_mach_info *mach_info = fbi->dev->platform_data;
684 unsigned long flags;
685 void __iomem *regs = fbi->io;
686 void __iomem *tpal;
687 void __iomem *lpcsel;
688
689 if (is_s3c2412(fbi)) {
690 tpal = regs + S3C2412_TPAL;
691 lpcsel = regs + S3C2412_TCONSEL;
692 } else {
693 tpal = regs + S3C2410_TPAL;
694 lpcsel = regs + S3C2410_LPCSEL;
695 }
696
697 /* Initialise LCD with values from haret */
698
699 local_irq_save(flags);
700
701 /* modify the gpio(s) with interrupts set (bjd) */
702
703 modify_gpio(S3C2410_GPCUP, mach_info->gpcup, mach_info->gpcup_mask);
704 modify_gpio(S3C2410_GPCCON, mach_info->gpccon, mach_info->gpccon_mask);
705 modify_gpio(S3C2410_GPDUP, mach_info->gpdup, mach_info->gpdup_mask);
706 modify_gpio(S3C2410_GPDCON, mach_info->gpdcon, mach_info->gpdcon_mask);
707
708 local_irq_restore(flags);
709
710 dprintk("LPCSEL = 0x%08lx\n", mach_info->lpcsel);
711 writel(mach_info->lpcsel, lpcsel);
712
713 dprintk("replacing TPAL %08x\n", readl(tpal));
714
715 /* ensure temporary palette disabled */
716 writel(0x00, tpal);
717
718 return 0;
719 }
720
721 static void s3c2410fb_write_palette(struct s3c2410fb_info *fbi)
722 {
723 unsigned int i;
724 void __iomem *regs = fbi->io;
725
726 fbi->palette_ready = 0;
727
728 for (i = 0; i < 256; i++) {
729 unsigned long ent = fbi->palette_buffer[i];
730 if (ent == PALETTE_BUFF_CLEAR)
731 continue;
732
733 writel(ent, regs + S3C2410_TFTPAL(i));
734
735 /* it seems the only way to know exactly
736 * if the palette wrote ok, is to check
737 * to see if the value verifies ok
738 */
739
740 if (readw(regs + S3C2410_TFTPAL(i)) == ent)
741 fbi->palette_buffer[i] = PALETTE_BUFF_CLEAR;
742 else
743 fbi->palette_ready = 1; /* retry */
744 }
745 }
746
747 static irqreturn_t s3c2410fb_irq(int irq, void *dev_id)
748 {
749 struct s3c2410fb_info *fbi = dev_id;
750 void __iomem *irq_base = fbi->irq_base;
751 unsigned long lcdirq = readl(irq_base + S3C24XX_LCDINTPND);
752
753 if (lcdirq & S3C2410_LCDINT_FRSYNC) {
754 if (fbi->palette_ready)
755 s3c2410fb_write_palette(fbi);
756
757 writel(S3C2410_LCDINT_FRSYNC, irq_base + S3C24XX_LCDINTPND);
758 writel(S3C2410_LCDINT_FRSYNC, irq_base + S3C24XX_LCDSRCPND);
759 }
760
761 return IRQ_HANDLED;
762 }
763
764 #ifdef CONFIG_CPU_FREQ
765
766 static int s3c2410fb_cpufreq_transition(struct notifier_block *nb,
767 unsigned long val, void *data)
768 {
769 struct cpufreq_freqs *freqs = data;
770 struct s3c2410fb_info *info;
771 struct fb_info *fbinfo;
772 long delta_f;
773
774 info = container_of(nb, struct s3c2410fb_info, freq_transition);
775 fbinfo = platform_get_drvdata(to_platform_device(info->dev));
776
777 /* work out change, <0 for speed-up */
778 delta_f = info->clk_rate - clk_get_rate(info->clk);
779
780 if ((val == CPUFREQ_POSTCHANGE && delta_f > 0) ||
781 (val == CPUFREQ_PRECHANGE && delta_f < 0)) {
782 info->clk_rate = clk_get_rate(info->clk);
783 s3c2410fb_activate_var(fbinfo);
784 }
785
786 return 0;
787 }
788
789 static inline int s3c2410fb_cpufreq_register(struct s3c2410fb_info *info)
790 {
791 info->freq_transition.notifier_call = s3c2410fb_cpufreq_transition;
792
793 return cpufreq_register_notifier(&info->freq_transition,
794 CPUFREQ_TRANSITION_NOTIFIER);
795 }
796
797 static inline void s3c2410fb_cpufreq_deregister(struct s3c2410fb_info *info)
798 {
799 cpufreq_unregister_notifier(&info->freq_transition,
800 CPUFREQ_TRANSITION_NOTIFIER);
801 }
802
803 #else
804 static inline int s3c2410fb_cpufreq_register(struct s3c2410fb_info *info)
805 {
806 return 0;
807 }
808
809 static inline void s3c2410fb_cpufreq_deregister(struct s3c2410fb_info *info)
810 {
811 }
812 #endif
813
814
815 static char driver_name[] = "s3c2410fb";
816
817 static int __init s3c24xxfb_probe(struct platform_device *pdev,
818 enum s3c_drv_type drv_type)
819 {
820 struct s3c2410fb_info *info;
821 struct s3c2410fb_display *display;
822 struct fb_info *fbinfo;
823 struct s3c2410fb_mach_info *mach_info;
824 struct resource *res;
825 int ret;
826 int irq;
827 int i;
828 int size;
829 u32 lcdcon1;
830
831 mach_info = pdev->dev.platform_data;
832 if (mach_info == NULL) {
833 dev_err(&pdev->dev,
834 "no platform data for lcd, cannot attach\n");
835 return -EINVAL;
836 }
837
838 if (mach_info->default_display >= mach_info->num_displays) {
839 dev_err(&pdev->dev, "default is %d but only %d displays\n",
840 mach_info->default_display, mach_info->num_displays);
841 return -EINVAL;
842 }
843
844 display = mach_info->displays + mach_info->default_display;
845
846 irq = platform_get_irq(pdev, 0);
847 if (irq < 0) {
848 dev_err(&pdev->dev, "no irq for device\n");
849 return -ENOENT;
850 }
851
852 fbinfo = framebuffer_alloc(sizeof(struct s3c2410fb_info), &pdev->dev);
853 if (!fbinfo)
854 return -ENOMEM;
855
856 platform_set_drvdata(pdev, fbinfo);
857
858 info = fbinfo->par;
859 info->dev = &pdev->dev;
860 info->drv_type = drv_type;
861
862 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
863 if (res == NULL) {
864 dev_err(&pdev->dev, "failed to get memory registers\n");
865 ret = -ENXIO;
866 goto dealloc_fb;
867 }
868
869 size = (res->end - res->start) + 1;
870 info->mem = request_mem_region(res->start, size, pdev->name);
871 if (info->mem == NULL) {
872 dev_err(&pdev->dev, "failed to get memory region\n");
873 ret = -ENOENT;
874 goto dealloc_fb;
875 }
876
877 info->io = ioremap(res->start, size);
878 if (info->io == NULL) {
879 dev_err(&pdev->dev, "ioremap() of registers failed\n");
880 ret = -ENXIO;
881 goto release_mem;
882 }
883
884 info->irq_base = info->io + ((drv_type == DRV_S3C2412) ? S3C2412_LCDINTBASE : S3C2410_LCDINTBASE);
885
886 dprintk("devinit\n");
887
888 strcpy(fbinfo->fix.id, driver_name);
889
890 /* Stop the video */
891 lcdcon1 = readl(info->io + S3C2410_LCDCON1);
892 writel(lcdcon1 & ~S3C2410_LCDCON1_ENVID, info->io + S3C2410_LCDCON1);
893
894 fbinfo->fix.type = FB_TYPE_PACKED_PIXELS;
895 fbinfo->fix.type_aux = 0;
896 fbinfo->fix.xpanstep = 0;
897 fbinfo->fix.ypanstep = 0;
898 fbinfo->fix.ywrapstep = 0;
899 fbinfo->fix.accel = FB_ACCEL_NONE;
900
901 fbinfo->var.nonstd = 0;
902 fbinfo->var.activate = FB_ACTIVATE_NOW;
903 fbinfo->var.accel_flags = 0;
904 fbinfo->var.vmode = FB_VMODE_NONINTERLACED;
905
906 fbinfo->fbops = &s3c2410fb_ops;
907 fbinfo->flags = FBINFO_FLAG_DEFAULT;
908 fbinfo->pseudo_palette = &info->pseudo_pal;
909
910 for (i = 0; i < 256; i++)
911 info->palette_buffer[i] = PALETTE_BUFF_CLEAR;
912
913 ret = request_irq(irq, s3c2410fb_irq, IRQF_DISABLED, pdev->name, info);
914 if (ret) {
915 dev_err(&pdev->dev, "cannot get irq %d - err %d\n", irq, ret);
916 ret = -EBUSY;
917 goto release_regs;
918 }
919
920 info->clk = clk_get(NULL, "lcd");
921 if (!info->clk || IS_ERR(info->clk)) {
922 printk(KERN_ERR "failed to get lcd clock source\n");
923 ret = -ENOENT;
924 goto release_irq;
925 }
926
927 clk_enable(info->clk);
928 dprintk("got and enabled clock\n");
929
930 msleep(1);
931
932 info->clk_rate = clk_get_rate(info->clk);
933
934 /* find maximum required memory size for display */
935 for (i = 0; i < mach_info->num_displays; i++) {
936 unsigned long smem_len = mach_info->displays[i].xres;
937
938 smem_len *= mach_info->displays[i].yres;
939 smem_len *= mach_info->displays[i].bpp;
940 smem_len >>= 3;
941 if (fbinfo->fix.smem_len < smem_len)
942 fbinfo->fix.smem_len = smem_len;
943 }
944
945 /* Initialize video memory */
946 ret = s3c2410fb_map_video_memory(fbinfo);
947 if (ret) {
948 printk(KERN_ERR "Failed to allocate video RAM: %d\n", ret);
949 ret = -ENOMEM;
950 goto release_clock;
951 }
952
953 dprintk("got video memory\n");
954
955 fbinfo->var.xres = display->xres;
956 fbinfo->var.yres = display->yres;
957 fbinfo->var.bits_per_pixel = display->bpp;
958
959 s3c2410fb_init_registers(fbinfo);
960
961 s3c2410fb_check_var(&fbinfo->var, fbinfo);
962
963 ret = s3c2410fb_cpufreq_register(info);
964 if (ret < 0) {
965 dev_err(&pdev->dev, "Failed to register cpufreq\n");
966 goto free_video_memory;
967 }
968
969 ret = register_framebuffer(fbinfo);
970 if (ret < 0) {
971 printk(KERN_ERR "Failed to register framebuffer device: %d\n",
972 ret);
973 goto free_cpufreq;
974 }
975
976 /* create device files */
977 ret = device_create_file(&pdev->dev, &dev_attr_debug);
978 if (ret) {
979 printk(KERN_ERR "failed to add debug attribute\n");
980 }
981
982 printk(KERN_INFO "fb%d: %s frame buffer device\n",
983 fbinfo->node, fbinfo->fix.id);
984
985 return 0;
986
987 free_cpufreq:
988 s3c2410fb_cpufreq_deregister(info);
989 free_video_memory:
990 s3c2410fb_unmap_video_memory(fbinfo);
991 release_clock:
992 clk_disable(info->clk);
993 clk_put(info->clk);
994 release_irq:
995 free_irq(irq, info);
996 release_regs:
997 iounmap(info->io);
998 release_mem:
999 release_resource(info->mem);
1000 kfree(info->mem);
1001 dealloc_fb:
1002 platform_set_drvdata(pdev, NULL);
1003 framebuffer_release(fbinfo);
1004 return ret;
1005 }
1006
1007 static int __init s3c2410fb_probe(struct platform_device *pdev)
1008 {
1009 return s3c24xxfb_probe(pdev, DRV_S3C2410);
1010 }
1011
1012 static int __init s3c2412fb_probe(struct platform_device *pdev)
1013 {
1014 return s3c24xxfb_probe(pdev, DRV_S3C2412);
1015 }
1016
1017
1018 /*
1019 * Cleanup
1020 */
1021 static int s3c2410fb_remove(struct platform_device *pdev)
1022 {
1023 struct fb_info *fbinfo = platform_get_drvdata(pdev);
1024 struct s3c2410fb_info *info = fbinfo->par;
1025 int irq;
1026
1027 unregister_framebuffer(fbinfo);
1028 s3c2410fb_cpufreq_deregister(info);
1029
1030 s3c2410fb_lcd_enable(info, 0);
1031 msleep(1);
1032
1033 s3c2410fb_unmap_video_memory(fbinfo);
1034
1035 if (info->clk) {
1036 clk_disable(info->clk);
1037 clk_put(info->clk);
1038 info->clk = NULL;
1039 }
1040
1041 irq = platform_get_irq(pdev, 0);
1042 free_irq(irq, info);
1043
1044 iounmap(info->io);
1045
1046 release_resource(info->mem);
1047 kfree(info->mem);
1048
1049 platform_set_drvdata(pdev, NULL);
1050 framebuffer_release(fbinfo);
1051
1052 return 0;
1053 }
1054
1055 #ifdef CONFIG_PM
1056
1057 /* suspend and resume support for the lcd controller */
1058 static int s3c2410fb_suspend(struct platform_device *dev, pm_message_t state)
1059 {
1060 struct fb_info *fbinfo = platform_get_drvdata(dev);
1061 struct s3c2410fb_info *info = fbinfo->par;
1062
1063 s3c2410fb_lcd_enable(info, 0);
1064
1065 /* sleep before disabling the clock, we need to ensure
1066 * the LCD DMA engine is not going to get back on the bus
1067 * before the clock goes off again (bjd) */
1068
1069 msleep(1);
1070 clk_disable(info->clk);
1071
1072 return 0;
1073 }
1074
1075 static int s3c2410fb_resume(struct platform_device *dev)
1076 {
1077 struct fb_info *fbinfo = platform_get_drvdata(dev);
1078 struct s3c2410fb_info *info = fbinfo->par;
1079
1080 clk_enable(info->clk);
1081 msleep(1);
1082
1083 s3c2410fb_init_registers(fbinfo);
1084
1085 /* re-activate our display after resume */
1086 s3c2410fb_activate_var(fbinfo);
1087 s3c2410fb_blank(FB_BLANK_UNBLANK, fbinfo);
1088
1089 return 0;
1090 }
1091
1092 #else
1093 #define s3c2410fb_suspend NULL
1094 #define s3c2410fb_resume NULL
1095 #endif
1096
1097 static struct platform_driver s3c2410fb_driver = {
1098 .probe = s3c2410fb_probe,
1099 .remove = s3c2410fb_remove,
1100 .suspend = s3c2410fb_suspend,
1101 .resume = s3c2410fb_resume,
1102 .driver = {
1103 .name = "s3c2410-lcd",
1104 .owner = THIS_MODULE,
1105 },
1106 };
1107
1108 static struct platform_driver s3c2412fb_driver = {
1109 .probe = s3c2412fb_probe,
1110 .remove = s3c2410fb_remove,
1111 .suspend = s3c2410fb_suspend,
1112 .resume = s3c2410fb_resume,
1113 .driver = {
1114 .name = "s3c2412-lcd",
1115 .owner = THIS_MODULE,
1116 },
1117 };
1118
1119 int __init s3c2410fb_init(void)
1120 {
1121 int ret = platform_driver_register(&s3c2410fb_driver);
1122
1123 if (ret == 0)
1124 ret = platform_driver_register(&s3c2412fb_driver);
1125
1126 return ret;
1127 }
1128
1129 static void __exit s3c2410fb_cleanup(void)
1130 {
1131 platform_driver_unregister(&s3c2410fb_driver);
1132 platform_driver_unregister(&s3c2412fb_driver);
1133 }
1134
1135 module_init(s3c2410fb_init);
1136 module_exit(s3c2410fb_cleanup);
1137
1138 MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>, "
1139 "Ben Dooks <ben-linux@fluff.org>");
1140 MODULE_DESCRIPTION("Framebuffer driver for the s3c2410");
1141 MODULE_LICENSE("GPL");
1142 MODULE_ALIAS("platform:s3c2410-lcd");
1143 MODULE_ALIAS("platform:s3c2412-lcd");
Linux with added FPC-III support