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Ben Dooksec549a02009-03-31 15:25:39 -07001/* linux/drivers/video/s3c-fb.c
2 *
3 * Copyright 2008 Openmoko Inc.
4 * Copyright 2008 Simtec Electronics
5 * Ben Dooks <ben@simtec.co.uk>
6 * http://armlinux.simtec.co.uk/
7 *
8 * Samsung SoC Framebuffer driver
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13*/
14
15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/platform_device.h>
18#include <linux/dma-mapping.h>
19#include <linux/init.h>
20#include <linux/gfp.h>
21#include <linux/clk.h>
22#include <linux/fb.h>
23#include <linux/io.h>
24
25#include <mach/map.h>
26#include <mach/regs-fb.h>
27#include <plat/fb.h>
28
29/* This driver will export a number of framebuffer interfaces depending
30 * on the configuration passed in via the platform data. Each fb instance
31 * maps to a hardware window. Currently there is no support for runtime
32 * setting of the alpha-blending functions that each window has, so only
33 * window 0 is actually useful.
34 *
35 * Window 0 is treated specially, it is used for the basis of the LCD
36 * output timings and as the control for the output power-down state.
37*/
38
39/* note, some of the functions that get called are derived from including
40 * <mach/regs-fb.h> as they are specific to the architecture that the code
41 * is being built for.
42*/
43
44#ifdef CONFIG_FB_S3C_DEBUG_REGWRITE
45#undef writel
46#define writel(v, r) do { \
47 printk(KERN_DEBUG "%s: %08x => %p\n", __func__, (unsigned int)v, r); \
48 __raw_writel(v, r); } while(0)
49#endif /* FB_S3C_DEBUG_REGWRITE */
50
51struct s3c_fb;
52
53/**
54 * struct s3c_fb_win - per window private data for each framebuffer.
55 * @windata: The platform data supplied for the window configuration.
56 * @parent: The hardware that this window is part of.
57 * @fbinfo: Pointer pack to the framebuffer info for this window.
58 * @palette_buffer: Buffer/cache to hold palette entries.
59 * @pseudo_palette: For use in TRUECOLOUR modes for entries 0..15/
60 * @index: The window number of this window.
61 * @palette: The bitfields for changing r/g/b into a hardware palette entry.
62 */
63struct s3c_fb_win {
64 struct s3c_fb_pd_win *windata;
65 struct s3c_fb *parent;
66 struct fb_info *fbinfo;
67 struct s3c_fb_palette palette;
68
69 u32 *palette_buffer;
70 u32 pseudo_palette[16];
71 unsigned int index;
72};
73
74/**
75 * struct s3c_fb - overall hardware state of the hardware
76 * @dev: The device that we bound to, for printing, etc.
77 * @regs_res: The resource we claimed for the IO registers.
78 * @bus_clk: The clk (hclk) feeding our interface and possibly pixclk.
79 * @regs: The mapped hardware registers.
80 * @enabled: A bitmask of enabled hardware windows.
81 * @pdata: The platform configuration data passed with the device.
82 * @windows: The hardware windows that have been claimed.
83 */
84struct s3c_fb {
85 struct device *dev;
86 struct resource *regs_res;
87 struct clk *bus_clk;
88 void __iomem *regs;
89
90 unsigned char enabled;
91
92 struct s3c_fb_platdata *pdata;
93 struct s3c_fb_win *windows[S3C_FB_MAX_WIN];
94};
95
96/**
97 * s3c_fb_win_has_palette() - determine if a mode has a palette
98 * @win: The window number being queried.
99 * @bpp: The number of bits per pixel to test.
100 *
101 * Work out if the given window supports palletised data at the specified bpp.
102 */
103static int s3c_fb_win_has_palette(unsigned int win, unsigned int bpp)
104{
105 return s3c_fb_win_pal_size(win) <= (1 << bpp);
106}
107
108/**
109 * s3c_fb_check_var() - framebuffer layer request to verify a given mode.
110 * @var: The screen information to verify.
111 * @info: The framebuffer device.
112 *
113 * Framebuffer layer call to verify the given information and allow us to
114 * update various information depending on the hardware capabilities.
115 */
116static int s3c_fb_check_var(struct fb_var_screeninfo *var,
117 struct fb_info *info)
118{
119 struct s3c_fb_win *win = info->par;
120 struct s3c_fb_pd_win *windata = win->windata;
121 struct s3c_fb *sfb = win->parent;
122
123 dev_dbg(sfb->dev, "checking parameters\n");
124
125 var->xres_virtual = max((unsigned int)windata->virtual_x, var->xres);
126 var->yres_virtual = max((unsigned int)windata->virtual_y, var->yres);
127
128 if (!s3c_fb_validate_win_bpp(win->index, var->bits_per_pixel)) {
129 dev_dbg(sfb->dev, "win %d: unsupported bpp %d\n",
130 win->index, var->bits_per_pixel);
131 return -EINVAL;
132 }
133
134 /* always ensure these are zero, for drop through cases below */
135 var->transp.offset = 0;
136 var->transp.length = 0;
137
138 switch (var->bits_per_pixel) {
139 case 1:
140 case 2:
141 case 4:
142 case 8:
143 if (!s3c_fb_win_has_palette(win->index, var->bits_per_pixel)) {
144 /* non palletised, A:1,R:2,G:3,B:2 mode */
145 var->red.offset = 4;
146 var->green.offset = 2;
147 var->blue.offset = 0;
148 var->red.length = 5;
149 var->green.length = 3;
150 var->blue.length = 2;
151 var->transp.offset = 7;
152 var->transp.length = 1;
153 } else {
154 var->red.offset = 0;
155 var->red.length = var->bits_per_pixel;
156 var->green = var->red;
157 var->blue = var->red;
158 }
159 break;
160
161 case 19:
162 /* 666 with one bit alpha/transparency */
163 var->transp.offset = 18;
164 var->transp.length = 1;
165 case 18:
166 var->bits_per_pixel = 32;
167
168 /* 666 format */
169 var->red.offset = 12;
170 var->green.offset = 6;
171 var->blue.offset = 0;
172 var->red.length = 6;
173 var->green.length = 6;
174 var->blue.length = 6;
175 break;
176
177 case 16:
178 /* 16 bpp, 565 format */
179 var->red.offset = 11;
180 var->green.offset = 5;
181 var->blue.offset = 0;
182 var->red.length = 5;
183 var->green.length = 6;
184 var->blue.length = 5;
185 break;
186
187 case 28:
188 case 25:
189 var->transp.length = var->bits_per_pixel - 24;
190 var->transp.offset = 24;
191 /* drop through */
192 case 24:
193 /* our 24bpp is unpacked, so 32bpp */
194 var->bits_per_pixel = 32;
195 case 32:
196 var->red.offset = 16;
197 var->red.length = 8;
198 var->green.offset = 8;
199 var->green.length = 8;
200 var->blue.offset = 0;
201 var->blue.length = 8;
202 break;
203
204 default:
205 dev_err(sfb->dev, "invalid bpp\n");
206 }
207
208 dev_dbg(sfb->dev, "%s: verified parameters\n", __func__);
209 return 0;
210}
211
212/**
213 * s3c_fb_calc_pixclk() - calculate the divider to create the pixel clock.
214 * @sfb: The hardware state.
215 * @pixclock: The pixel clock wanted, in picoseconds.
216 *
217 * Given the specified pixel clock, work out the necessary divider to get
218 * close to the output frequency.
219 */
Mark Browneb29a5c2010-01-15 17:01:40 -0800220static int s3c_fb_calc_pixclk(struct s3c_fb *sfb, unsigned int pixclk)
Ben Dooksec549a02009-03-31 15:25:39 -0700221{
222 unsigned long clk = clk_get_rate(sfb->bus_clk);
Mark Browneb29a5c2010-01-15 17:01:40 -0800223 unsigned long long tmp;
Ben Dooksec549a02009-03-31 15:25:39 -0700224 unsigned int result;
225
Mark Browneb29a5c2010-01-15 17:01:40 -0800226 tmp = (unsigned long long)clk;
227 tmp *= pixclk;
228
229 do_div(tmp, 1000000000UL);
230 result = (unsigned int)tmp / 1000;
Ben Dooksec549a02009-03-31 15:25:39 -0700231
232 dev_dbg(sfb->dev, "pixclk=%u, clk=%lu, div=%d (%lu)\n",
233 pixclk, clk, result, clk / result);
234
235 return result;
236}
237
238/**
239 * s3c_fb_align_word() - align pixel count to word boundary
240 * @bpp: The number of bits per pixel
241 * @pix: The value to be aligned.
242 *
243 * Align the given pixel count so that it will start on an 32bit word
244 * boundary.
245 */
246static int s3c_fb_align_word(unsigned int bpp, unsigned int pix)
247{
248 int pix_per_word;
249
250 if (bpp > 16)
251 return pix;
252
253 pix_per_word = (8 * 32) / bpp;
254 return ALIGN(pix, pix_per_word);
255}
256
257/**
258 * s3c_fb_set_par() - framebuffer request to set new framebuffer state.
259 * @info: The framebuffer to change.
260 *
261 * Framebuffer layer request to set a new mode for the specified framebuffer
262 */
263static int s3c_fb_set_par(struct fb_info *info)
264{
265 struct fb_var_screeninfo *var = &info->var;
266 struct s3c_fb_win *win = info->par;
267 struct s3c_fb *sfb = win->parent;
268 void __iomem *regs = sfb->regs;
269 int win_no = win->index;
InKi Dae600ce1a2009-07-05 12:08:21 -0700270 u32 osdc_data = 0;
Ben Dooksec549a02009-03-31 15:25:39 -0700271 u32 data;
272 u32 pagewidth;
273 int clkdiv;
274
275 dev_dbg(sfb->dev, "setting framebuffer parameters\n");
276
277 switch (var->bits_per_pixel) {
278 case 32:
279 case 24:
280 case 16:
281 case 12:
282 info->fix.visual = FB_VISUAL_TRUECOLOR;
283 break;
284 case 8:
285 if (s3c_fb_win_has_palette(win_no, 8))
286 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
287 else
288 info->fix.visual = FB_VISUAL_TRUECOLOR;
289 break;
290 case 1:
291 info->fix.visual = FB_VISUAL_MONO01;
292 break;
293 default:
294 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
295 break;
296 }
297
298 info->fix.line_length = (var->xres_virtual * var->bits_per_pixel) / 8;
299
300 /* disable the window whilst we update it */
301 writel(0, regs + WINCON(win_no));
302
303 /* use window 0 as the basis for the lcd output timings */
304
305 if (win_no == 0) {
Mark Browneb29a5c2010-01-15 17:01:40 -0800306 clkdiv = s3c_fb_calc_pixclk(sfb, var->pixclock);
Ben Dooksec549a02009-03-31 15:25:39 -0700307
308 data = sfb->pdata->vidcon0;
309 data &= ~(VIDCON0_CLKVAL_F_MASK | VIDCON0_CLKDIR);
310
311 if (clkdiv > 1)
312 data |= VIDCON0_CLKVAL_F(clkdiv-1) | VIDCON0_CLKDIR;
313 else
314 data &= ~VIDCON0_CLKDIR; /* 1:1 clock */
315
316 /* write the timing data to the panel */
317
318 data |= VIDCON0_ENVID | VIDCON0_ENVID_F;
319 writel(data, regs + VIDCON0);
320
321 data = VIDTCON0_VBPD(var->upper_margin - 1) |
322 VIDTCON0_VFPD(var->lower_margin - 1) |
323 VIDTCON0_VSPW(var->vsync_len - 1);
324
325 writel(data, regs + VIDTCON0);
326
327 data = VIDTCON1_HBPD(var->left_margin - 1) |
328 VIDTCON1_HFPD(var->right_margin - 1) |
329 VIDTCON1_HSPW(var->hsync_len - 1);
330
331 writel(data, regs + VIDTCON1);
332
333 data = VIDTCON2_LINEVAL(var->yres - 1) |
334 VIDTCON2_HOZVAL(var->xres - 1);
335 writel(data, regs + VIDTCON2);
336 }
337
338 /* write the buffer address */
339
340 writel(info->fix.smem_start, regs + VIDW_BUF_START(win_no));
341
342 data = info->fix.smem_start + info->fix.line_length * var->yres;
343 writel(data, regs + VIDW_BUF_END(win_no));
344
345 pagewidth = (var->xres * var->bits_per_pixel) >> 3;
346 data = VIDW_BUF_SIZE_OFFSET(info->fix.line_length - pagewidth) |
347 VIDW_BUF_SIZE_PAGEWIDTH(pagewidth);
348 writel(data, regs + VIDW_BUF_SIZE(win_no));
349
350 /* write 'OSD' registers to control position of framebuffer */
351
352 data = VIDOSDxA_TOPLEFT_X(0) | VIDOSDxA_TOPLEFT_Y(0);
353 writel(data, regs + VIDOSD_A(win_no));
354
355 data = VIDOSDxB_BOTRIGHT_X(s3c_fb_align_word(var->bits_per_pixel,
356 var->xres - 1)) |
357 VIDOSDxB_BOTRIGHT_Y(var->yres - 1);
358
359 writel(data, regs + VIDOSD_B(win_no));
360
361 data = var->xres * var->yres;
InKi Dae39000d62009-06-16 15:34:27 -0700362
InKi Dae39000d62009-06-16 15:34:27 -0700363 osdc_data = VIDISD14C_ALPHA1_R(0xf) |
364 VIDISD14C_ALPHA1_G(0xf) |
365 VIDISD14C_ALPHA1_B(0xf);
366
Ben Dooksec549a02009-03-31 15:25:39 -0700367 if (s3c_fb_has_osd_d(win_no)) {
368 writel(data, regs + VIDOSD_D(win_no));
InKi Dae39000d62009-06-16 15:34:27 -0700369 writel(osdc_data, regs + VIDOSD_C(win_no));
Ben Dooksec549a02009-03-31 15:25:39 -0700370 } else
371 writel(data, regs + VIDOSD_C(win_no));
372
373 data = WINCONx_ENWIN;
374
375 /* note, since we have to round up the bits-per-pixel, we end up
376 * relying on the bitfield information for r/g/b/a to work out
377 * exactly which mode of operation is intended. */
378
379 switch (var->bits_per_pixel) {
380 case 1:
381 data |= WINCON0_BPPMODE_1BPP;
382 data |= WINCONx_BITSWP;
383 data |= WINCONx_BURSTLEN_4WORD;
384 break;
385 case 2:
386 data |= WINCON0_BPPMODE_2BPP;
387 data |= WINCONx_BITSWP;
388 data |= WINCONx_BURSTLEN_8WORD;
389 break;
390 case 4:
391 data |= WINCON0_BPPMODE_4BPP;
392 data |= WINCONx_BITSWP;
393 data |= WINCONx_BURSTLEN_8WORD;
394 break;
395 case 8:
396 if (var->transp.length != 0)
397 data |= WINCON1_BPPMODE_8BPP_1232;
398 else
399 data |= WINCON0_BPPMODE_8BPP_PALETTE;
400 data |= WINCONx_BURSTLEN_8WORD;
401 data |= WINCONx_BYTSWP;
402 break;
403 case 16:
404 if (var->transp.length != 0)
405 data |= WINCON1_BPPMODE_16BPP_A1555;
406 else
407 data |= WINCON0_BPPMODE_16BPP_565;
408 data |= WINCONx_HAWSWP;
409 data |= WINCONx_BURSTLEN_16WORD;
410 break;
411 case 24:
412 case 32:
413 if (var->red.length == 6) {
414 if (var->transp.length != 0)
415 data |= WINCON1_BPPMODE_19BPP_A1666;
416 else
417 data |= WINCON1_BPPMODE_18BPP_666;
InKi Dae39000d62009-06-16 15:34:27 -0700418 } else if (var->transp.length == 1)
419 data |= WINCON1_BPPMODE_25BPP_A1888
420 | WINCON1_BLD_PIX;
421 else if (var->transp.length == 4)
422 data |= WINCON1_BPPMODE_28BPP_A4888
423 | WINCON1_BLD_PIX | WINCON1_ALPHA_SEL;
Ben Dooksec549a02009-03-31 15:25:39 -0700424 else
425 data |= WINCON0_BPPMODE_24BPP_888;
426
427 data |= WINCONx_BURSTLEN_16WORD;
428 break;
429 }
430
InKi Dae39000d62009-06-16 15:34:27 -0700431 /* It has no color key control register for window0 */
432 if (win_no > 0) {
433 u32 keycon0_data = 0, keycon1_data = 0;
434
435 keycon0_data = ~(WxKEYCON0_KEYBL_EN |
436 WxKEYCON0_KEYEN_F |
437 WxKEYCON0_DIRCON) | WxKEYCON0_COMPKEY(0);
438
439 keycon1_data = WxKEYCON1_COLVAL(0xffffff);
440
441 writel(keycon0_data, regs + WxKEYCONy(win_no-1, 0));
442 writel(keycon1_data, regs + WxKEYCONy(win_no-1, 1));
443 }
444
Ben Dooksec549a02009-03-31 15:25:39 -0700445 writel(data, regs + WINCON(win_no));
446 writel(0x0, regs + WINxMAP(win_no));
447
448 return 0;
449}
450
451/**
452 * s3c_fb_update_palette() - set or schedule a palette update.
453 * @sfb: The hardware information.
454 * @win: The window being updated.
455 * @reg: The palette index being changed.
456 * @value: The computed palette value.
457 *
458 * Change the value of a palette register, either by directly writing to
459 * the palette (this requires the palette RAM to be disconnected from the
460 * hardware whilst this is in progress) or schedule the update for later.
461 *
462 * At the moment, since we have no VSYNC interrupt support, we simply set
463 * the palette entry directly.
464 */
465static void s3c_fb_update_palette(struct s3c_fb *sfb,
466 struct s3c_fb_win *win,
467 unsigned int reg,
468 u32 value)
469{
470 void __iomem *palreg;
471 u32 palcon;
472
473 palreg = sfb->regs + s3c_fb_pal_reg(win->index, reg);
474
475 dev_dbg(sfb->dev, "%s: win %d, reg %d (%p): %08x\n",
476 __func__, win->index, reg, palreg, value);
477
478 win->palette_buffer[reg] = value;
479
480 palcon = readl(sfb->regs + WPALCON);
481 writel(palcon | WPALCON_PAL_UPDATE, sfb->regs + WPALCON);
482
483 if (s3c_fb_pal_is16(win->index))
484 writew(value, palreg);
485 else
486 writel(value, palreg);
487
488 writel(palcon, sfb->regs + WPALCON);
489}
490
491static inline unsigned int chan_to_field(unsigned int chan,
492 struct fb_bitfield *bf)
493{
494 chan &= 0xffff;
495 chan >>= 16 - bf->length;
496 return chan << bf->offset;
497}
498
499/**
500 * s3c_fb_setcolreg() - framebuffer layer request to change palette.
501 * @regno: The palette index to change.
502 * @red: The red field for the palette data.
503 * @green: The green field for the palette data.
504 * @blue: The blue field for the palette data.
505 * @trans: The transparency (alpha) field for the palette data.
506 * @info: The framebuffer being changed.
507 */
508static int s3c_fb_setcolreg(unsigned regno,
509 unsigned red, unsigned green, unsigned blue,
510 unsigned transp, struct fb_info *info)
511{
512 struct s3c_fb_win *win = info->par;
513 struct s3c_fb *sfb = win->parent;
514 unsigned int val;
515
516 dev_dbg(sfb->dev, "%s: win %d: %d => rgb=%d/%d/%d\n",
517 __func__, win->index, regno, red, green, blue);
518
519 switch (info->fix.visual) {
520 case FB_VISUAL_TRUECOLOR:
521 /* true-colour, use pseudo-palette */
522
523 if (regno < 16) {
524 u32 *pal = info->pseudo_palette;
525
526 val = chan_to_field(red, &info->var.red);
527 val |= chan_to_field(green, &info->var.green);
528 val |= chan_to_field(blue, &info->var.blue);
529
530 pal[regno] = val;
531 }
532 break;
533
534 case FB_VISUAL_PSEUDOCOLOR:
535 if (regno < s3c_fb_win_pal_size(win->index)) {
536 val = chan_to_field(red, &win->palette.r);
537 val |= chan_to_field(green, &win->palette.g);
538 val |= chan_to_field(blue, &win->palette.b);
539
540 s3c_fb_update_palette(sfb, win, regno, val);
541 }
542
543 break;
544
545 default:
546 return 1; /* unknown type */
547 }
548
549 return 0;
550}
551
552/**
553 * s3c_fb_enable() - Set the state of the main LCD output
554 * @sfb: The main framebuffer state.
555 * @enable: The state to set.
556 */
557static void s3c_fb_enable(struct s3c_fb *sfb, int enable)
558{
559 u32 vidcon0 = readl(sfb->regs + VIDCON0);
560
561 if (enable)
562 vidcon0 |= VIDCON0_ENVID | VIDCON0_ENVID_F;
563 else {
564 /* see the note in the framebuffer datasheet about
565 * why you cannot take both of these bits down at the
566 * same time. */
567
568 if (!(vidcon0 & VIDCON0_ENVID))
569 return;
570
571 vidcon0 |= VIDCON0_ENVID;
572 vidcon0 &= ~VIDCON0_ENVID_F;
573 }
574
575 writel(vidcon0, sfb->regs + VIDCON0);
576}
577
578/**
579 * s3c_fb_blank() - blank or unblank the given window
580 * @blank_mode: The blank state from FB_BLANK_*
581 * @info: The framebuffer to blank.
582 *
583 * Framebuffer layer request to change the power state.
584 */
585static int s3c_fb_blank(int blank_mode, struct fb_info *info)
586{
587 struct s3c_fb_win *win = info->par;
588 struct s3c_fb *sfb = win->parent;
589 unsigned int index = win->index;
590 u32 wincon;
591
592 dev_dbg(sfb->dev, "blank mode %d\n", blank_mode);
593
594 wincon = readl(sfb->regs + WINCON(index));
595
596 switch (blank_mode) {
597 case FB_BLANK_POWERDOWN:
598 wincon &= ~WINCONx_ENWIN;
599 sfb->enabled &= ~(1 << index);
600 /* fall through to FB_BLANK_NORMAL */
601
602 case FB_BLANK_NORMAL:
603 /* disable the DMA and display 0x0 (black) */
604 writel(WINxMAP_MAP | WINxMAP_MAP_COLOUR(0x0),
605 sfb->regs + WINxMAP(index));
606 break;
607
608 case FB_BLANK_UNBLANK:
609 writel(0x0, sfb->regs + WINxMAP(index));
610 wincon |= WINCONx_ENWIN;
611 sfb->enabled |= (1 << index);
612 break;
613
614 case FB_BLANK_VSYNC_SUSPEND:
615 case FB_BLANK_HSYNC_SUSPEND:
616 default:
617 return 1;
618 }
619
620 writel(wincon, sfb->regs + WINCON(index));
621
622 /* Check the enabled state to see if we need to be running the
623 * main LCD interface, as if there are no active windows then
624 * it is highly likely that we also do not need to output
625 * anything.
626 */
627
628 /* We could do something like the following code, but the current
629 * system of using framebuffer events means that we cannot make
630 * the distinction between just window 0 being inactive and all
631 * the windows being down.
632 *
633 * s3c_fb_enable(sfb, sfb->enabled ? 1 : 0);
634 */
635
636 /* we're stuck with this until we can do something about overriding
637 * the power control using the blanking event for a single fb.
638 */
639 if (index == 0)
640 s3c_fb_enable(sfb, blank_mode != FB_BLANK_POWERDOWN ? 1 : 0);
641
642 return 0;
643}
644
645static struct fb_ops s3c_fb_ops = {
646 .owner = THIS_MODULE,
647 .fb_check_var = s3c_fb_check_var,
648 .fb_set_par = s3c_fb_set_par,
649 .fb_blank = s3c_fb_blank,
650 .fb_setcolreg = s3c_fb_setcolreg,
651 .fb_fillrect = cfb_fillrect,
652 .fb_copyarea = cfb_copyarea,
653 .fb_imageblit = cfb_imageblit,
654};
655
656/**
657 * s3c_fb_alloc_memory() - allocate display memory for framebuffer window
658 * @sfb: The base resources for the hardware.
659 * @win: The window to initialise memory for.
660 *
661 * Allocate memory for the given framebuffer.
662 */
663static int __devinit s3c_fb_alloc_memory(struct s3c_fb *sfb,
664 struct s3c_fb_win *win)
665{
666 struct s3c_fb_pd_win *windata = win->windata;
667 unsigned int real_size, virt_size, size;
668 struct fb_info *fbi = win->fbinfo;
669 dma_addr_t map_dma;
670
671 dev_dbg(sfb->dev, "allocating memory for display\n");
672
673 real_size = windata->win_mode.xres * windata->win_mode.yres;
674 virt_size = windata->virtual_x * windata->virtual_y;
675
676 dev_dbg(sfb->dev, "real_size=%u (%u.%u), virt_size=%u (%u.%u)\n",
677 real_size, windata->win_mode.xres, windata->win_mode.yres,
678 virt_size, windata->virtual_x, windata->virtual_y);
679
680 size = (real_size > virt_size) ? real_size : virt_size;
681 size *= (windata->max_bpp > 16) ? 32 : windata->max_bpp;
682 size /= 8;
683
684 fbi->fix.smem_len = size;
685 size = PAGE_ALIGN(size);
686
687 dev_dbg(sfb->dev, "want %u bytes for window\n", size);
688
689 fbi->screen_base = dma_alloc_writecombine(sfb->dev, size,
690 &map_dma, GFP_KERNEL);
691 if (!fbi->screen_base)
692 return -ENOMEM;
693
694 dev_dbg(sfb->dev, "mapped %x to %p\n",
695 (unsigned int)map_dma, fbi->screen_base);
696
697 memset(fbi->screen_base, 0x0, size);
698 fbi->fix.smem_start = map_dma;
699
700 return 0;
701}
702
703/**
704 * s3c_fb_free_memory() - free the display memory for the given window
705 * @sfb: The base resources for the hardware.
706 * @win: The window to free the display memory for.
707 *
708 * Free the display memory allocated by s3c_fb_alloc_memory().
709 */
710static void s3c_fb_free_memory(struct s3c_fb *sfb, struct s3c_fb_win *win)
711{
712 struct fb_info *fbi = win->fbinfo;
713
714 dma_free_writecombine(sfb->dev, PAGE_ALIGN(fbi->fix.smem_len),
715 fbi->screen_base, fbi->fix.smem_start);
716}
717
718/**
719 * s3c_fb_release_win() - release resources for a framebuffer window.
720 * @win: The window to cleanup the resources for.
721 *
722 * Release the resources that where claimed for the hardware window,
723 * such as the framebuffer instance and any memory claimed for it.
724 */
725static void s3c_fb_release_win(struct s3c_fb *sfb, struct s3c_fb_win *win)
726{
Krzysztof Heltddc518d2009-06-16 15:34:33 -0700727 if (win->fbinfo) {
728 unregister_framebuffer(win->fbinfo);
729 fb_dealloc_cmap(&win->fbinfo->cmap);
730 s3c_fb_free_memory(sfb, win);
731 framebuffer_release(win->fbinfo);
732 }
Ben Dooksec549a02009-03-31 15:25:39 -0700733}
734
735/**
736 * s3c_fb_probe_win() - register an hardware window
737 * @sfb: The base resources for the hardware
738 * @res: Pointer to where to place the resultant window.
739 *
740 * Allocate and do the basic initialisation for one of the hardware's graphics
741 * windows.
742 */
743static int __devinit s3c_fb_probe_win(struct s3c_fb *sfb, unsigned int win_no,
744 struct s3c_fb_win **res)
745{
746 struct fb_var_screeninfo *var;
747 struct fb_videomode *initmode;
748 struct s3c_fb_pd_win *windata;
749 struct s3c_fb_win *win;
750 struct fb_info *fbinfo;
751 int palette_size;
752 int ret;
753
754 dev_dbg(sfb->dev, "probing window %d\n", win_no);
755
756 palette_size = s3c_fb_win_pal_size(win_no);
757
758 fbinfo = framebuffer_alloc(sizeof(struct s3c_fb_win) +
759 palette_size * sizeof(u32), sfb->dev);
760 if (!fbinfo) {
761 dev_err(sfb->dev, "failed to allocate framebuffer\n");
762 return -ENOENT;
763 }
764
765 windata = sfb->pdata->win[win_no];
766 initmode = &windata->win_mode;
767
768 WARN_ON(windata->max_bpp == 0);
769 WARN_ON(windata->win_mode.xres == 0);
770 WARN_ON(windata->win_mode.yres == 0);
771
772 win = fbinfo->par;
773 var = &fbinfo->var;
774 win->fbinfo = fbinfo;
775 win->parent = sfb;
776 win->windata = windata;
777 win->index = win_no;
778 win->palette_buffer = (u32 *)(win + 1);
779
780 ret = s3c_fb_alloc_memory(sfb, win);
781 if (ret) {
782 dev_err(sfb->dev, "failed to allocate display memory\n");
Krzysztof Heltddc518d2009-06-16 15:34:33 -0700783 return ret;
Ben Dooksec549a02009-03-31 15:25:39 -0700784 }
785
786 /* setup the r/b/g positions for the window's palette */
787 s3c_fb_init_palette(win_no, &win->palette);
788
789 /* setup the initial video mode from the window */
790 fb_videomode_to_var(&fbinfo->var, initmode);
791
792 fbinfo->fix.type = FB_TYPE_PACKED_PIXELS;
793 fbinfo->fix.accel = FB_ACCEL_NONE;
794 fbinfo->var.activate = FB_ACTIVATE_NOW;
795 fbinfo->var.vmode = FB_VMODE_NONINTERLACED;
796 fbinfo->var.bits_per_pixel = windata->default_bpp;
797 fbinfo->fbops = &s3c_fb_ops;
798 fbinfo->flags = FBINFO_FLAG_DEFAULT;
799 fbinfo->pseudo_palette = &win->pseudo_palette;
800
801 /* prepare to actually start the framebuffer */
802
803 ret = s3c_fb_check_var(&fbinfo->var, fbinfo);
804 if (ret < 0) {
805 dev_err(sfb->dev, "check_var failed on initial video params\n");
Krzysztof Heltddc518d2009-06-16 15:34:33 -0700806 return ret;
Ben Dooksec549a02009-03-31 15:25:39 -0700807 }
808
809 /* create initial colour map */
810
811 ret = fb_alloc_cmap(&fbinfo->cmap, s3c_fb_win_pal_size(win_no), 1);
812 if (ret == 0)
813 fb_set_cmap(&fbinfo->cmap, fbinfo);
814 else
815 dev_err(sfb->dev, "failed to allocate fb cmap\n");
816
817 s3c_fb_set_par(fbinfo);
818
819 dev_dbg(sfb->dev, "about to register framebuffer\n");
820
821 /* run the check_var and set_par on our configuration. */
822
823 ret = register_framebuffer(fbinfo);
824 if (ret < 0) {
825 dev_err(sfb->dev, "failed to register framebuffer\n");
Krzysztof Heltddc518d2009-06-16 15:34:33 -0700826 return ret;
Ben Dooksec549a02009-03-31 15:25:39 -0700827 }
828
829 *res = win;
830 dev_info(sfb->dev, "window %d: fb %s\n", win_no, fbinfo->fix.id);
831
832 return 0;
Ben Dooksec549a02009-03-31 15:25:39 -0700833}
834
835/**
836 * s3c_fb_clear_win() - clear hardware window registers.
837 * @sfb: The base resources for the hardware.
838 * @win: The window to process.
839 *
840 * Reset the specific window registers to a known state.
841 */
842static void s3c_fb_clear_win(struct s3c_fb *sfb, int win)
843{
844 void __iomem *regs = sfb->regs;
845
846 writel(0, regs + WINCON(win));
847 writel(0xffffff, regs + WxKEYCONy(win, 0));
848 writel(0xffffff, regs + WxKEYCONy(win, 1));
849
850 writel(0, regs + VIDOSD_A(win));
851 writel(0, regs + VIDOSD_B(win));
852 writel(0, regs + VIDOSD_C(win));
853}
854
855static int __devinit s3c_fb_probe(struct platform_device *pdev)
856{
857 struct device *dev = &pdev->dev;
858 struct s3c_fb_platdata *pd;
859 struct s3c_fb *sfb;
860 struct resource *res;
861 int win;
862 int ret = 0;
863
864 pd = pdev->dev.platform_data;
865 if (!pd) {
866 dev_err(dev, "no platform data specified\n");
867 return -EINVAL;
868 }
869
870 sfb = kzalloc(sizeof(struct s3c_fb), GFP_KERNEL);
871 if (!sfb) {
872 dev_err(dev, "no memory for framebuffers\n");
873 return -ENOMEM;
874 }
875
876 sfb->dev = dev;
877 sfb->pdata = pd;
878
879 sfb->bus_clk = clk_get(dev, "lcd");
880 if (IS_ERR(sfb->bus_clk)) {
881 dev_err(dev, "failed to get bus clock\n");
882 goto err_sfb;
883 }
884
885 clk_enable(sfb->bus_clk);
886
887 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
888 if (!res) {
889 dev_err(dev, "failed to find registers\n");
890 ret = -ENOENT;
891 goto err_clk;
892 }
893
894 sfb->regs_res = request_mem_region(res->start, resource_size(res),
895 dev_name(dev));
896 if (!sfb->regs_res) {
897 dev_err(dev, "failed to claim register region\n");
898 ret = -ENOENT;
899 goto err_clk;
900 }
901
902 sfb->regs = ioremap(res->start, resource_size(res));
903 if (!sfb->regs) {
904 dev_err(dev, "failed to map registers\n");
905 ret = -ENXIO;
906 goto err_req_region;
907 }
908
909 dev_dbg(dev, "got resources (regs %p), probing windows\n", sfb->regs);
910
911 /* setup gpio and output polarity controls */
912
913 pd->setup_gpio();
914
915 writel(pd->vidcon1, sfb->regs + VIDCON1);
916
917 /* zero all windows before we do anything */
918
919 for (win = 0; win < S3C_FB_MAX_WIN; win++)
920 s3c_fb_clear_win(sfb, win);
921
922 /* we have the register setup, start allocating framebuffers */
923
924 for (win = 0; win < S3C_FB_MAX_WIN; win++) {
925 if (!pd->win[win])
926 continue;
927
928 ret = s3c_fb_probe_win(sfb, win, &sfb->windows[win]);
929 if (ret < 0) {
930 dev_err(dev, "failed to create window %d\n", win);
931 for (; win >= 0; win--)
932 s3c_fb_release_win(sfb, sfb->windows[win]);
933 goto err_ioremap;
934 }
935 }
936
937 platform_set_drvdata(pdev, sfb);
938
939 return 0;
940
941err_ioremap:
942 iounmap(sfb->regs);
943
944err_req_region:
945 release_resource(sfb->regs_res);
946 kfree(sfb->regs_res);
947
948err_clk:
949 clk_disable(sfb->bus_clk);
950 clk_put(sfb->bus_clk);
951
952err_sfb:
953 kfree(sfb);
954 return ret;
955}
956
957/**
958 * s3c_fb_remove() - Cleanup on module finalisation
959 * @pdev: The platform device we are bound to.
960 *
961 * Shutdown and then release all the resources that the driver allocated
962 * on initialisation.
963 */
964static int __devexit s3c_fb_remove(struct platform_device *pdev)
965{
966 struct s3c_fb *sfb = platform_get_drvdata(pdev);
967 int win;
968
Pawel Osciakc42b1102009-07-29 15:02:10 -0700969 for (win = 0; win < S3C_FB_MAX_WIN; win++)
Marek Szyprowski17663e52009-05-28 14:34:35 -0700970 if (sfb->windows[win])
971 s3c_fb_release_win(sfb, sfb->windows[win]);
Ben Dooksec549a02009-03-31 15:25:39 -0700972
973 iounmap(sfb->regs);
974
975 clk_disable(sfb->bus_clk);
976 clk_put(sfb->bus_clk);
977
978 release_resource(sfb->regs_res);
979 kfree(sfb->regs_res);
980
981 kfree(sfb);
982
983 return 0;
984}
985
986#ifdef CONFIG_PM
987static int s3c_fb_suspend(struct platform_device *pdev, pm_message_t state)
988{
989 struct s3c_fb *sfb = platform_get_drvdata(pdev);
990 struct s3c_fb_win *win;
991 int win_no;
992
Pawel Osciakc42b1102009-07-29 15:02:10 -0700993 for (win_no = S3C_FB_MAX_WIN - 1; win_no >= 0; win_no--) {
Ben Dooksec549a02009-03-31 15:25:39 -0700994 win = sfb->windows[win_no];
995 if (!win)
996 continue;
997
998 /* use the blank function to push into power-down */
999 s3c_fb_blank(FB_BLANK_POWERDOWN, win->fbinfo);
1000 }
1001
1002 clk_disable(sfb->bus_clk);
1003 return 0;
1004}
1005
1006static int s3c_fb_resume(struct platform_device *pdev)
1007{
1008 struct s3c_fb *sfb = platform_get_drvdata(pdev);
Marek Szyprowski17663e52009-05-28 14:34:35 -07001009 struct s3c_fb_platdata *pd = sfb->pdata;
Ben Dooksec549a02009-03-31 15:25:39 -07001010 struct s3c_fb_win *win;
1011 int win_no;
1012
1013 clk_enable(sfb->bus_clk);
1014
Marek Szyprowski17663e52009-05-28 14:34:35 -07001015 /* setup registers */
1016 writel(pd->vidcon1, sfb->regs + VIDCON1);
1017
1018 /* zero all windows before we do anything */
1019 for (win_no = 0; win_no < S3C_FB_MAX_WIN; win_no++)
1020 s3c_fb_clear_win(sfb, win_no);
1021
1022 /* restore framebuffers */
Ben Dooksec549a02009-03-31 15:25:39 -07001023 for (win_no = 0; win_no < S3C_FB_MAX_WIN; win_no++) {
1024 win = sfb->windows[win_no];
1025 if (!win)
1026 continue;
1027
1028 dev_dbg(&pdev->dev, "resuming window %d\n", win_no);
1029 s3c_fb_set_par(win->fbinfo);
1030 }
1031
1032 return 0;
1033}
1034#else
1035#define s3c_fb_suspend NULL
1036#define s3c_fb_resume NULL
1037#endif
1038
1039static struct platform_driver s3c_fb_driver = {
1040 .probe = s3c_fb_probe,
Peter Korsgaard3163eaba2009-09-22 16:47:55 -07001041 .remove = __devexit_p(s3c_fb_remove),
Ben Dooksec549a02009-03-31 15:25:39 -07001042 .suspend = s3c_fb_suspend,
1043 .resume = s3c_fb_resume,
1044 .driver = {
1045 .name = "s3c-fb",
1046 .owner = THIS_MODULE,
1047 },
1048};
1049
1050static int __init s3c_fb_init(void)
1051{
1052 return platform_driver_register(&s3c_fb_driver);
1053}
1054
1055static void __exit s3c_fb_cleanup(void)
1056{
1057 platform_driver_unregister(&s3c_fb_driver);
1058}
1059
1060module_init(s3c_fb_init);
1061module_exit(s3c_fb_cleanup);
1062
1063MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
1064MODULE_DESCRIPTION("Samsung S3C SoC Framebuffer driver");
1065MODULE_LICENSE("GPL");
1066MODULE_ALIAS("platform:s3c-fb");