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-rw-r--r--drivers/video/s3c2410fb.c915
1 files changed, 915 insertions, 0 deletions
diff --git a/drivers/video/s3c2410fb.c b/drivers/video/s3c2410fb.c
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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
90#include <asm/io.h>
91#include <asm/uaccess.h>
92#include <asm/div64.h>
93
94#include <asm/mach/map.h>
95#include <asm/arch/regs-lcd.h>
96#include <asm/arch/regs-gpio.h>
97#include <asm/arch/fb.h>
98#include <asm/hardware/clock.h>
99
100#ifdef CONFIG_PM
101#include <linux/pm.h>
102#endif
103
104#include "s3c2410fb.h"
105
106
107static struct s3c2410fb_mach_info *mach_info;
108
109/* Debugging stuff */
110#ifdef CONFIG_FB_S3C2410_DEBUG
111static int debug = 1;
112#else
113static int debug = 0;
114#endif
115
116#define dprintk(msg...) if (debug) { printk(KERN_DEBUG "s3c2410fb: " msg); }
117
118/* useful functions */
119
120/* s3c2410fb_set_lcdaddr
121 *
122 * initialise lcd controller address pointers
123*/
124
125static void s3c2410fb_set_lcdaddr(struct s3c2410fb_info *fbi)
126{
127 struct fb_var_screeninfo *var = &fbi->fb->var;
128 unsigned long saddr1, saddr2, saddr3;
129
130 saddr1 = fbi->fb->fix.smem_start >> 1;
131 saddr2 = fbi->fb->fix.smem_start;
132 saddr2 += (var->xres * var->yres * var->bits_per_pixel)/8;
133 saddr2>>= 1;
134
135 saddr3 = S3C2410_OFFSIZE(0) | S3C2410_PAGEWIDTH(var->xres);
136
137 dprintk("LCDSADDR1 = 0x%08lx\n", saddr1);
138 dprintk("LCDSADDR2 = 0x%08lx\n", saddr2);
139 dprintk("LCDSADDR3 = 0x%08lx\n", saddr3);
140
141 writel(saddr1, S3C2410_LCDSADDR1);
142 writel(saddr2, S3C2410_LCDSADDR2);
143 writel(saddr3, S3C2410_LCDSADDR3);
144}
145
146/* s3c2410fb_calc_pixclk()
147 *
148 * calculate divisor for clk->pixclk
149*/
150
151static unsigned int s3c2410fb_calc_pixclk(struct s3c2410fb_info *fbi,
152 unsigned long pixclk)
153{
154 unsigned long clk = clk_get_rate(fbi->clk);
155 unsigned long long div;
156
157 /* pixclk is in picoseoncds, our clock is in Hz
158 *
159 * Hz -> picoseconds is / 10^-12
160 */
161
162 div = (unsigned long long)clk * pixclk;
163 do_div(div,1000000UL);
164 do_div(div,1000000UL);
165
166 dprintk("pixclk %ld, divisor is %ld\n", pixclk, (long)div);
167 return div;
168}
169
170/*
171 * s3c2410fb_check_var():
172 * Get the video params out of 'var'. If a value doesn't fit, round it up,
173 * if it's too big, return -EINVAL.
174 *
175 */
176static int s3c2410fb_check_var(struct fb_var_screeninfo *var,
177 struct fb_info *info)
178{
179 struct s3c2410fb_info *fbi = info->par;
180
181 dprintk("check_var(var=%p, info=%p)\n", var, info);
182
183 /* validate x/y resolution */
184
185 if (var->yres > fbi->mach_info->yres.max)
186 var->yres = fbi->mach_info->yres.max;
187 else if (var->yres < fbi->mach_info->yres.min)
188 var->yres = fbi->mach_info->yres.min;
189
190 if (var->xres > fbi->mach_info->xres.max)
191 var->yres = fbi->mach_info->xres.max;
192 else if (var->xres < fbi->mach_info->xres.min)
193 var->xres = fbi->mach_info->xres.min;
194
195 /* validate bpp */
196
197 if (var->bits_per_pixel > fbi->mach_info->bpp.max)
198 var->bits_per_pixel = fbi->mach_info->bpp.max;
199 else if (var->bits_per_pixel < fbi->mach_info->bpp.min)
200 var->bits_per_pixel = fbi->mach_info->bpp.min;
201
202 /* set r/g/b positions */
203
204 if (var->bits_per_pixel == 16) {
205 var->red.offset = 11;
206 var->green.offset = 5;
207 var->blue.offset = 0;
208 var->red.length = 5;
209 var->green.length = 6;
210 var->blue.length = 5;
211 var->transp.length = 0;
212 } else {
213 var->red.length = var->bits_per_pixel;
214 var->red.offset = 0;
215 var->green.length = var->bits_per_pixel;
216 var->green.offset = 0;
217 var->blue.length = var->bits_per_pixel;
218 var->blue.offset = 0;
219 var->transp.length = 0;
220 }
221
222 return 0;
223}
224
225/* s3c2410fb_activate_var
226 *
227 * activate (set) the controller from the given framebuffer
228 * information
229*/
230
231static int s3c2410fb_activate_var(struct s3c2410fb_info *fbi,
232 struct fb_var_screeninfo *var)
233{
234 fbi->regs.lcdcon1 &= ~S3C2410_LCDCON1_MODEMASK;
235
236 dprintk("%s: var->xres = %d\n", __FUNCTION__, var->xres);
237 dprintk("%s: var->yres = %d\n", __FUNCTION__, var->yres);
238 dprintk("%s: var->bpp = %d\n", __FUNCTION__, var->bits_per_pixel);
239
240 switch (var->bits_per_pixel) {
241 case 1:
242 fbi->regs.lcdcon1 |= S3C2410_LCDCON1_TFT1BPP;
243 break;
244 case 2:
245 fbi->regs.lcdcon1 |= S3C2410_LCDCON1_TFT2BPP;
246 break;
247 case 4:
248 fbi->regs.lcdcon1 |= S3C2410_LCDCON1_TFT4BPP;
249 break;
250 case 8:
251 fbi->regs.lcdcon1 |= S3C2410_LCDCON1_TFT8BPP;
252 break;
253 case 16:
254 fbi->regs.lcdcon1 |= S3C2410_LCDCON1_TFT16BPP;
255 break;
256 }
257
258 /* check to see if we need to update sync/borders */
259
260 if (!fbi->mach_info->fixed_syncs) {
261 dprintk("setting vert: up=%d, low=%d, sync=%d\n",
262 var->upper_margin, var->lower_margin,
263 var->vsync_len);
264
265 dprintk("setting horz: lft=%d, rt=%d, sync=%d\n",
266 var->left_margin, var->right_margin,
267 var->hsync_len);
268
269 fbi->regs.lcdcon2 =
270 S3C2410_LCDCON2_VBPD(var->upper_margin - 1) |
271 S3C2410_LCDCON2_VFPD(var->lower_margin - 1) |
272 S3C2410_LCDCON2_VSPW(var->vsync_len - 1);
273
274 fbi->regs.lcdcon3 =
275 S3C2410_LCDCON3_HBPD(var->right_margin - 1) |
276 S3C2410_LCDCON3_HFPD(var->left_margin - 1);
277
278 fbi->regs.lcdcon4 &= ~S3C2410_LCDCON4_HSPW(0xff);
279 fbi->regs.lcdcon4 |= S3C2410_LCDCON4_HSPW(var->hsync_len - 1);
280 }
281
282 /* update X/Y info */
283
284 fbi->regs.lcdcon2 &= ~S3C2410_LCDCON2_LINEVAL(0x3ff);
285 fbi->regs.lcdcon2 |= S3C2410_LCDCON2_LINEVAL(var->yres - 1);
286
287 fbi->regs.lcdcon3 &= ~S3C2410_LCDCON3_HOZVAL(0x7ff);
288 fbi->regs.lcdcon3 |= S3C2410_LCDCON3_HOZVAL(var->xres - 1);
289
290 if (var->pixclock > 0) {
291 int clkdiv = s3c2410fb_calc_pixclk(fbi, var->pixclock);
292
293 clkdiv = (clkdiv / 2) -1;
294 if (clkdiv < 0)
295 clkdiv = 0;
296
297 fbi->regs.lcdcon1 &= ~S3C2410_LCDCON1_CLKVAL(0x3ff);
298 fbi->regs.lcdcon1 |= S3C2410_LCDCON1_CLKVAL(clkdiv);
299 }
300
301 /* write new registers */
302
303 dprintk("new register set:\n");
304 dprintk("lcdcon[1] = 0x%08lx\n", fbi->regs.lcdcon1);
305 dprintk("lcdcon[2] = 0x%08lx\n", fbi->regs.lcdcon2);
306 dprintk("lcdcon[3] = 0x%08lx\n", fbi->regs.lcdcon3);
307 dprintk("lcdcon[4] = 0x%08lx\n", fbi->regs.lcdcon4);
308 dprintk("lcdcon[5] = 0x%08lx\n", fbi->regs.lcdcon5);
309
310 writel(fbi->regs.lcdcon1 & ~S3C2410_LCDCON1_ENVID, S3C2410_LCDCON1);
311 writel(fbi->regs.lcdcon2, S3C2410_LCDCON2);
312 writel(fbi->regs.lcdcon3, S3C2410_LCDCON3);
313 writel(fbi->regs.lcdcon4, S3C2410_LCDCON4);
314 writel(fbi->regs.lcdcon5, S3C2410_LCDCON5);
315
316 /* set lcd address pointers */
317 s3c2410fb_set_lcdaddr(fbi);
318
319 writel(fbi->regs.lcdcon1, S3C2410_LCDCON1);
320}
321
322
323/*
324 * s3c2410fb_set_par - Optional function. Alters the hardware state.
325 * @info: frame buffer structure that represents a single frame buffer
326 *
327 */
328static int s3c2410fb_set_par(struct fb_info *info)
329{
330 struct s3c2410fb_info *fbi = info->par;
331 struct fb_var_screeninfo *var = &info->var;
332
333 if (var->bits_per_pixel == 16)
334 fbi->fb->fix.visual = FB_VISUAL_TRUECOLOR;
335 else
336 fbi->fb->fix.visual = FB_VISUAL_PSEUDOCOLOR;
337
338 fbi->fb->fix.line_length = (var->width*var->bits_per_pixel)/8;
339
340 /* activate this new configuration */
341
342 s3c2410fb_activate_var(fbi, var);
343 return 0;
344}
345
346static void schedule_palette_update(struct s3c2410fb_info *fbi,
347 unsigned int regno, unsigned int val)
348{
349 unsigned long flags;
350 unsigned long irqen;
351
352 local_irq_save(flags);
353
354 fbi->palette_buffer[regno] = val;
355
356 if (!fbi->palette_ready) {
357 fbi->palette_ready = 1;
358
359 /* enable IRQ */
360 irqen = readl(S3C2410_LCDINTMSK);
361 irqen &= ~S3C2410_LCDINT_FRSYNC;
362 writel(irqen, S3C2410_LCDINTMSK);
363 }
364
365 local_irq_restore(flags);
366}
367
368/* from pxafb.c */
369static inline unsigned int chan_to_field(unsigned int chan, struct fb_bitfield *bf)
370{
371 chan &= 0xffff;
372 chan >>= 16 - bf->length;
373 return chan << bf->offset;
374}
375
376static int s3c2410fb_setcolreg(unsigned regno,
377 unsigned red, unsigned green, unsigned blue,
378 unsigned transp, struct fb_info *info)
379{
380 struct s3c2410fb_info *fbi = info->par;
381 unsigned int val;
382
383 /* dprintk("setcol: regno=%d, rgb=%d,%d,%d\n", regno, red, green, blue); */
384
385 switch (fbi->fb->fix.visual) {
386 case FB_VISUAL_TRUECOLOR:
387 /* true-colour, use pseuo-palette */
388
389 if (regno < 16) {
390 u32 *pal = fbi->fb->pseudo_palette;
391
392 val = chan_to_field(red, &fbi->fb->var.red);
393 val |= chan_to_field(green, &fbi->fb->var.green);
394 val |= chan_to_field(blue, &fbi->fb->var.blue);
395
396 pal[regno] = val;
397 }
398 break;
399
400 case FB_VISUAL_PSEUDOCOLOR:
401 if (regno < 256) {
402 /* currently assume RGB 5-6-5 mode */
403
404 val = ((red >> 0) & 0xf800);
405 val |= ((green >> 5) & 0x07e0);
406 val |= ((blue >> 11) & 0x001f);
407
408 writel(val, S3C2410_TFTPAL(regno));
409 schedule_palette_update(fbi, regno, val);
410 }
411
412 break;
413
414 default:
415 return 1; /* unknown type */
416 }
417
418 return 0;
419}
420
421
422/**
423 * s3c2410fb_blank
424 * @blank_mode: the blank mode we want.
425 * @info: frame buffer structure that represents a single frame buffer
426 *
427 * Blank the screen if blank_mode != 0, else unblank. Return 0 if
428 * blanking succeeded, != 0 if un-/blanking failed due to e.g. a
429 * video mode which doesn't support it. Implements VESA suspend
430 * and powerdown modes on hardware that supports disabling hsync/vsync:
431 * blank_mode == 2: suspend vsync
432 * blank_mode == 3: suspend hsync
433 * blank_mode == 4: powerdown
434 *
435 * Returns negative errno on error, or zero on success.
436 *
437 */
438static int s3c2410fb_blank(int blank_mode, struct fb_info *info)
439{
440 dprintk("blank(mode=%d, info=%p)\n", blank_mode, info);
441
442 if (mach_info == NULL)
443 return -EINVAL;
444
445 if (blank_mode == FB_BLANK_UNBLANK)
446 writel(0x0, S3C2410_TPAL);
447 else {
448 dprintk("setting TPAL to output 0x000000\n");
449 writel(S3C2410_TPAL_EN, S3C2410_TPAL);
450 }
451
452 return 0;
453}
454
455static int s3c2410fb_debug_show(struct device *dev, struct device_attribute *attr, char *buf)
456{
457 return snprintf(buf, PAGE_SIZE, "%s\n", debug ? "on" : "off");
458}
459static int s3c2410fb_debug_store(struct device *dev, struct device_attribute *attr,
460 const char *buf, size_t len)
461{
462 if (mach_info == NULL)
463 return -EINVAL;
464
465 if (len < 1)
466 return -EINVAL;
467
468 if (strnicmp(buf, "on", 2) == 0 ||
469 strnicmp(buf, "1", 1) == 0) {
470 debug = 1;
471 printk(KERN_DEBUG "s3c2410fb: Debug On");
472 } else if (strnicmp(buf, "off", 3) == 0 ||
473 strnicmp(buf, "0", 1) == 0) {
474 debug = 0;
475 printk(KERN_DEBUG "s3c2410fb: Debug Off");
476 } else {
477 return -EINVAL;
478 }
479
480 return len;
481}
482
483
484static DEVICE_ATTR(debug, 0666,
485 s3c2410fb_debug_show,
486 s3c2410fb_debug_store);
487
488static struct fb_ops s3c2410fb_ops = {
489 .owner = THIS_MODULE,
490 .fb_check_var = s3c2410fb_check_var,
491 .fb_set_par = s3c2410fb_set_par,
492 .fb_blank = s3c2410fb_blank,
493 .fb_setcolreg = s3c2410fb_setcolreg,
494 .fb_fillrect = cfb_fillrect,
495 .fb_copyarea = cfb_copyarea,
496 .fb_imageblit = cfb_imageblit,
497 .fb_cursor = soft_cursor,
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 */
509static 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
536static 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
541static 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
555int 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
594static 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
619static 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
635static char driver_name[]="s3c2410fb";
636
637int __init s3c2410fb_probe(struct device *dev)
638{
639 struct s3c2410fb_info *info;
640 struct fb_info *fbinfo;
641 struct platform_device *pdev = to_platform_device(dev);
642 struct s3c2410fb_hw *mregs;
643 int ret;
644 int irq;
645 int i;
646
647 mach_info = dev->platform_data;
648 if (mach_info == NULL) {
649 dev_err(dev,"no platform data for lcd, cannot attach\n");
650 return -EINVAL;
651 }
652
653 mregs = &mach_info->regs;
654
655 irq = platform_get_irq(pdev, 0);
656 if (irq < 0) {
657 dev_err(dev, "no irq for device\n");
658 return -ENOENT;
659 }
660
661 fbinfo = framebuffer_alloc(sizeof(struct s3c2410fb_info), dev);
662 if (!fbinfo) {
663 return -ENOMEM;
664 }
665
666
667 info = fbinfo->par;
668 info->fb = fbinfo;
669 dev_set_drvdata(dev, fbinfo);
670
671 s3c2410fb_init_registers(info);
672
673 dprintk("devinit\n");
674
675 strcpy(fbinfo->fix.id, driver_name);
676
677 memcpy(&info->regs, &mach_info->regs, sizeof(info->regs));
678
679 info->mach_info = dev->platform_data;
680
681 fbinfo->fix.type = FB_TYPE_PACKED_PIXELS;
682 fbinfo->fix.type_aux = 0;
683 fbinfo->fix.xpanstep = 0;
684 fbinfo->fix.ypanstep = 0;
685 fbinfo->fix.ywrapstep = 0;
686 fbinfo->fix.accel = FB_ACCEL_NONE;
687
688 fbinfo->var.nonstd = 0;
689 fbinfo->var.activate = FB_ACTIVATE_NOW;
690 fbinfo->var.height = mach_info->height;
691 fbinfo->var.width = mach_info->width;
692 fbinfo->var.accel_flags = 0;
693 fbinfo->var.vmode = FB_VMODE_NONINTERLACED;
694
695 fbinfo->fbops = &s3c2410fb_ops;
696 fbinfo->flags = FBINFO_FLAG_DEFAULT;
697 fbinfo->pseudo_palette = &info->pseudo_pal;
698
699 fbinfo->var.xres = mach_info->xres.defval;
700 fbinfo->var.xres_virtual = mach_info->xres.defval;
701 fbinfo->var.yres = mach_info->yres.defval;
702 fbinfo->var.yres_virtual = mach_info->yres.defval;
703 fbinfo->var.bits_per_pixel = mach_info->bpp.defval;
704
705 fbinfo->var.upper_margin = S3C2410_LCDCON2_GET_VBPD(mregs->lcdcon2) +1;
706 fbinfo->var.lower_margin = S3C2410_LCDCON2_GET_VFPD(mregs->lcdcon2) +1;
707 fbinfo->var.vsync_len = S3C2410_LCDCON2_GET_VSPW(mregs->lcdcon2) + 1;
708
709 fbinfo->var.left_margin = S3C2410_LCDCON3_GET_HFPD(mregs->lcdcon3) + 1;
710 fbinfo->var.right_margin = S3C2410_LCDCON3_GET_HBPD(mregs->lcdcon3) + 1;
711 fbinfo->var.hsync_len = S3C2410_LCDCON4_GET_HSPW(mregs->lcdcon4) + 1;
712
713 fbinfo->var.red.offset = 11;
714 fbinfo->var.green.offset = 5;
715 fbinfo->var.blue.offset = 0;
716 fbinfo->var.transp.offset = 0;
717 fbinfo->var.red.length = 5;
718 fbinfo->var.green.length = 6;
719 fbinfo->var.blue.length = 5;
720 fbinfo->var.transp.length = 0;
721 fbinfo->fix.smem_len = mach_info->xres.max *
722 mach_info->yres.max *
723 mach_info->bpp.max / 8;
724
725 for (i = 0; i < 256; i++)
726 info->palette_buffer[i] = PALETTE_BUFF_CLEAR;
727
728 if (!request_mem_region((unsigned long)S3C24XX_VA_LCD, SZ_1M, "s3c2410-lcd")) {
729 ret = -EBUSY;
730 goto dealloc_fb;
731 }
732
733
734 dprintk("got LCD region\n");
735
736 ret = request_irq(irq, s3c2410fb_irq, SA_INTERRUPT, pdev->name, info);
737 if (ret) {
738 dev_err(dev, "cannot get irq %d - err %d\n", irq, ret);
739 ret = -EBUSY;
740 goto release_mem;
741 }
742
743 info->clk = clk_get(NULL, "lcd");
744 if (!info->clk || IS_ERR(info->clk)) {
745 printk(KERN_ERR "failed to get lcd clock source\n");
746 ret = -ENOENT;
747 goto release_irq;
748 }
749
750 clk_use(info->clk);
751 clk_enable(info->clk);
752 dprintk("got and enabled clock\n");
753
754 msleep(1);
755
756 /* Initialize video memory */
757 ret = s3c2410fb_map_video_memory(info);
758 if (ret) {
759 printk( KERN_ERR "Failed to allocate video RAM: %d\n", ret);
760 ret = -ENOMEM;
761 goto release_clock;
762 }
763 dprintk("got video memory\n");
764
765 ret = s3c2410fb_init_registers(info);
766
767 ret = s3c2410fb_check_var(&fbinfo->var, fbinfo);
768
769 ret = register_framebuffer(fbinfo);
770 if (ret < 0) {
771 printk(KERN_ERR "Failed to register framebuffer device: %d\n", ret);
772 goto free_video_memory;
773 }
774
775 /* create device files */
776 device_create_file(dev, &dev_attr_debug);
777
778 printk(KERN_INFO "fb%d: %s frame buffer device\n",
779 fbinfo->node, fbinfo->fix.id);
780
781 return 0;
782
783free_video_memory:
784 s3c2410fb_unmap_video_memory(info);
785release_clock:
786 clk_disable(info->clk);
787 clk_unuse(info->clk);
788 clk_put(info->clk);
789release_irq:
790 free_irq(irq,info);
791release_mem:
792 release_mem_region((unsigned long)S3C24XX_VA_LCD, S3C24XX_SZ_LCD);
793dealloc_fb:
794 framebuffer_release(fbinfo);
795 return ret;
796}
797
798/* s3c2410fb_stop_lcd
799 *
800 * shutdown the lcd controller
801*/
802
803static void s3c2410fb_stop_lcd(void)
804{
805 unsigned long flags;
806 unsigned long tmp;
807
808 local_irq_save(flags);
809
810 tmp = readl(S3C2410_LCDCON1);
811 writel(tmp & ~S3C2410_LCDCON1_ENVID, S3C2410_LCDCON1);
812
813 local_irq_restore(flags);
814}
815
816/*
817 * Cleanup
818 */
819static int s3c2410fb_remove(struct device *dev)
820{
821 struct platform_device *pdev = to_platform_device(dev);
822 struct fb_info *fbinfo = dev_get_drvdata(dev);
823 struct s3c2410fb_info *info = fbinfo->par;
824 int irq;
825
826 s3c2410fb_stop_lcd();
827 msleep(1);
828
829 s3c2410fb_unmap_video_memory(info);
830
831 if (info->clk) {
832 clk_disable(info->clk);
833 clk_unuse(info->clk);
834 clk_put(info->clk);
835 info->clk = NULL;
836 }
837
838 irq = platform_get_irq(pdev, 0);
839 free_irq(irq,info);
840 release_mem_region((unsigned long)S3C24XX_VA_LCD, S3C24XX_SZ_LCD);
841 unregister_framebuffer(fbinfo);
842
843 return 0;
844}
845
846#ifdef CONFIG_PM
847
848/* suspend and resume support for the lcd controller */
849
850static int s3c2410fb_suspend(struct device *dev, pm_message_t state, u32 level)
851{
852 struct fb_info *fbinfo = dev_get_drvdata(dev);
853 struct s3c2410fb_info *info = fbinfo->par;
854
855 if (level == SUSPEND_DISABLE || level == SUSPEND_POWER_DOWN) {
856 s3c2410fb_stop_lcd();
857
858 /* sleep before disabling the clock, we need to ensure
859 * the LCD DMA engine is not going to get back on the bus
860 * before the clock goes off again (bjd) */
861
862 msleep(1);
863 clk_disable(info->clk);
864 }
865
866 return 0;
867}
868
869static int s3c2410fb_resume(struct device *dev, u32 level)
870{
871 struct fb_info *fbinfo = dev_get_drvdata(dev);
872 struct s3c2410fb_info *info = fbinfo->par;
873
874 if (level == RESUME_ENABLE) {
875 clk_enable(info->clk);
876 msleep(1);
877
878 s3c2410fb_init_registers(info);
879
880 }
881
882 return 0;
883}
884
885#else
886#define s3c2410fb_suspend NULL
887#define s3c2410fb_resume NULL
888#endif
889
890static struct device_driver s3c2410fb_driver = {
891 .name = "s3c2410-lcd",
892 .bus = &platform_bus_type,
893 .probe = s3c2410fb_probe,
894 .suspend = s3c2410fb_suspend,
895 .resume = s3c2410fb_resume,
896 .remove = s3c2410fb_remove
897};
898
899int __devinit s3c2410fb_init(void)
900{
901 return driver_register(&s3c2410fb_driver);
902}
903
904static void __exit s3c2410fb_cleanup(void)
905{
906 driver_unregister(&s3c2410fb_driver);
907}
908
909
910module_init(s3c2410fb_init);
911module_exit(s3c2410fb_cleanup);
912
913MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>, Ben Dooks <ben-linux@fluff.org>");
914MODULE_DESCRIPTION("Framebuffer driver for the s3c2410");
915MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2025-11-09 12:59:51 -0500