blob: 5a72083dc67c76c4b7f9f9f2fbb4c5604cab5eca [file] [log] [blame]
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.
InKi Dae600ce1a2009-07-05 12:08:21 -0700214 * @id: window id.
Ben Dooksec549a02009-03-31 15:25:39 -0700215 * @sfb: The hardware state.
216 * @pixclock: The pixel clock wanted, in picoseconds.
217 *
218 * Given the specified pixel clock, work out the necessary divider to get
219 * close to the output frequency.
220 */
InKi Dae600ce1a2009-07-05 12:08:21 -0700221static int s3c_fb_calc_pixclk(unsigned char id, struct s3c_fb *sfb, unsigned int pixclk)
Ben Dooksec549a02009-03-31 15:25:39 -0700222{
InKi Dae600ce1a2009-07-05 12:08:21 -0700223 struct s3c_fb_pd_win *win = sfb->pdata->win[id];
Ben Dooksec549a02009-03-31 15:25:39 -0700224 unsigned long clk = clk_get_rate(sfb->bus_clk);
Ben Dooksec549a02009-03-31 15:25:39 -0700225 unsigned int result;
226
InKi Dae600ce1a2009-07-05 12:08:21 -0700227 pixclk *= win->win_mode.refresh;
228 result = clk / pixclk;
Ben Dooksec549a02009-03-31 15:25:39 -0700229
230 dev_dbg(sfb->dev, "pixclk=%u, clk=%lu, div=%d (%lu)\n",
231 pixclk, clk, result, clk / result);
232
233 return result;
234}
235
236/**
237 * s3c_fb_align_word() - align pixel count to word boundary
238 * @bpp: The number of bits per pixel
239 * @pix: The value to be aligned.
240 *
241 * Align the given pixel count so that it will start on an 32bit word
242 * boundary.
243 */
244static int s3c_fb_align_word(unsigned int bpp, unsigned int pix)
245{
246 int pix_per_word;
247
248 if (bpp > 16)
249 return pix;
250
251 pix_per_word = (8 * 32) / bpp;
252 return ALIGN(pix, pix_per_word);
253}
254
255/**
256 * s3c_fb_set_par() - framebuffer request to set new framebuffer state.
257 * @info: The framebuffer to change.
258 *
259 * Framebuffer layer request to set a new mode for the specified framebuffer
260 */
261static int s3c_fb_set_par(struct fb_info *info)
262{
263 struct fb_var_screeninfo *var = &info->var;
264 struct s3c_fb_win *win = info->par;
265 struct s3c_fb *sfb = win->parent;
266 void __iomem *regs = sfb->regs;
267 int win_no = win->index;
InKi Dae600ce1a2009-07-05 12:08:21 -0700268 u32 osdc_data = 0;
Ben Dooksec549a02009-03-31 15:25:39 -0700269 u32 data;
270 u32 pagewidth;
271 int clkdiv;
272
273 dev_dbg(sfb->dev, "setting framebuffer parameters\n");
274
275 switch (var->bits_per_pixel) {
276 case 32:
277 case 24:
278 case 16:
279 case 12:
280 info->fix.visual = FB_VISUAL_TRUECOLOR;
281 break;
282 case 8:
283 if (s3c_fb_win_has_palette(win_no, 8))
284 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
285 else
286 info->fix.visual = FB_VISUAL_TRUECOLOR;
287 break;
288 case 1:
289 info->fix.visual = FB_VISUAL_MONO01;
290 break;
291 default:
292 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
293 break;
294 }
295
296 info->fix.line_length = (var->xres_virtual * var->bits_per_pixel) / 8;
297
298 /* disable the window whilst we update it */
299 writel(0, regs + WINCON(win_no));
300
301 /* use window 0 as the basis for the lcd output timings */
302
303 if (win_no == 0) {
InKi Dae600ce1a2009-07-05 12:08:21 -0700304 clkdiv = s3c_fb_calc_pixclk(win_no, sfb, var->pixclock);
Ben Dooksec549a02009-03-31 15:25:39 -0700305
306 data = sfb->pdata->vidcon0;
307 data &= ~(VIDCON0_CLKVAL_F_MASK | VIDCON0_CLKDIR);
308
309 if (clkdiv > 1)
310 data |= VIDCON0_CLKVAL_F(clkdiv-1) | VIDCON0_CLKDIR;
311 else
312 data &= ~VIDCON0_CLKDIR; /* 1:1 clock */
313
314 /* write the timing data to the panel */
315
316 data |= VIDCON0_ENVID | VIDCON0_ENVID_F;
317 writel(data, regs + VIDCON0);
318
319 data = VIDTCON0_VBPD(var->upper_margin - 1) |
320 VIDTCON0_VFPD(var->lower_margin - 1) |
321 VIDTCON0_VSPW(var->vsync_len - 1);
322
323 writel(data, regs + VIDTCON0);
324
325 data = VIDTCON1_HBPD(var->left_margin - 1) |
326 VIDTCON1_HFPD(var->right_margin - 1) |
327 VIDTCON1_HSPW(var->hsync_len - 1);
328
329 writel(data, regs + VIDTCON1);
330
331 data = VIDTCON2_LINEVAL(var->yres - 1) |
332 VIDTCON2_HOZVAL(var->xres - 1);
333 writel(data, regs + VIDTCON2);
334 }
335
336 /* write the buffer address */
337
338 writel(info->fix.smem_start, regs + VIDW_BUF_START(win_no));
339
340 data = info->fix.smem_start + info->fix.line_length * var->yres;
341 writel(data, regs + VIDW_BUF_END(win_no));
342
343 pagewidth = (var->xres * var->bits_per_pixel) >> 3;
344 data = VIDW_BUF_SIZE_OFFSET(info->fix.line_length - pagewidth) |
345 VIDW_BUF_SIZE_PAGEWIDTH(pagewidth);
346 writel(data, regs + VIDW_BUF_SIZE(win_no));
347
348 /* write 'OSD' registers to control position of framebuffer */
349
350 data = VIDOSDxA_TOPLEFT_X(0) | VIDOSDxA_TOPLEFT_Y(0);
351 writel(data, regs + VIDOSD_A(win_no));
352
353 data = VIDOSDxB_BOTRIGHT_X(s3c_fb_align_word(var->bits_per_pixel,
354 var->xres - 1)) |
355 VIDOSDxB_BOTRIGHT_Y(var->yres - 1);
356
357 writel(data, regs + VIDOSD_B(win_no));
358
359 data = var->xres * var->yres;
InKi Dae39000d62009-06-16 15:34:27 -0700360
InKi Dae39000d62009-06-16 15:34:27 -0700361 osdc_data = VIDISD14C_ALPHA1_R(0xf) |
362 VIDISD14C_ALPHA1_G(0xf) |
363 VIDISD14C_ALPHA1_B(0xf);
364
Ben Dooksec549a02009-03-31 15:25:39 -0700365 if (s3c_fb_has_osd_d(win_no)) {
366 writel(data, regs + VIDOSD_D(win_no));
InKi Dae39000d62009-06-16 15:34:27 -0700367 writel(osdc_data, regs + VIDOSD_C(win_no));
Ben Dooksec549a02009-03-31 15:25:39 -0700368 } else
369 writel(data, regs + VIDOSD_C(win_no));
370
371 data = WINCONx_ENWIN;
372
373 /* note, since we have to round up the bits-per-pixel, we end up
374 * relying on the bitfield information for r/g/b/a to work out
375 * exactly which mode of operation is intended. */
376
377 switch (var->bits_per_pixel) {
378 case 1:
379 data |= WINCON0_BPPMODE_1BPP;
380 data |= WINCONx_BITSWP;
381 data |= WINCONx_BURSTLEN_4WORD;
382 break;
383 case 2:
384 data |= WINCON0_BPPMODE_2BPP;
385 data |= WINCONx_BITSWP;
386 data |= WINCONx_BURSTLEN_8WORD;
387 break;
388 case 4:
389 data |= WINCON0_BPPMODE_4BPP;
390 data |= WINCONx_BITSWP;
391 data |= WINCONx_BURSTLEN_8WORD;
392 break;
393 case 8:
394 if (var->transp.length != 0)
395 data |= WINCON1_BPPMODE_8BPP_1232;
396 else
397 data |= WINCON0_BPPMODE_8BPP_PALETTE;
398 data |= WINCONx_BURSTLEN_8WORD;
399 data |= WINCONx_BYTSWP;
400 break;
401 case 16:
402 if (var->transp.length != 0)
403 data |= WINCON1_BPPMODE_16BPP_A1555;
404 else
405 data |= WINCON0_BPPMODE_16BPP_565;
406 data |= WINCONx_HAWSWP;
407 data |= WINCONx_BURSTLEN_16WORD;
408 break;
409 case 24:
410 case 32:
411 if (var->red.length == 6) {
412 if (var->transp.length != 0)
413 data |= WINCON1_BPPMODE_19BPP_A1666;
414 else
415 data |= WINCON1_BPPMODE_18BPP_666;
InKi Dae39000d62009-06-16 15:34:27 -0700416 } else if (var->transp.length == 1)
417 data |= WINCON1_BPPMODE_25BPP_A1888
418 | WINCON1_BLD_PIX;
419 else if (var->transp.length == 4)
420 data |= WINCON1_BPPMODE_28BPP_A4888
421 | WINCON1_BLD_PIX | WINCON1_ALPHA_SEL;
Ben Dooksec549a02009-03-31 15:25:39 -0700422 else
423 data |= WINCON0_BPPMODE_24BPP_888;
424
425 data |= WINCONx_BURSTLEN_16WORD;
426 break;
427 }
428
InKi Dae39000d62009-06-16 15:34:27 -0700429 /* It has no color key control register for window0 */
430 if (win_no > 0) {
431 u32 keycon0_data = 0, keycon1_data = 0;
432
433 keycon0_data = ~(WxKEYCON0_KEYBL_EN |
434 WxKEYCON0_KEYEN_F |
435 WxKEYCON0_DIRCON) | WxKEYCON0_COMPKEY(0);
436
437 keycon1_data = WxKEYCON1_COLVAL(0xffffff);
438
439 writel(keycon0_data, regs + WxKEYCONy(win_no-1, 0));
440 writel(keycon1_data, regs + WxKEYCONy(win_no-1, 1));
441 }
442
Ben Dooksec549a02009-03-31 15:25:39 -0700443 writel(data, regs + WINCON(win_no));
444 writel(0x0, regs + WINxMAP(win_no));
445
446 return 0;
447}
448
449/**
450 * s3c_fb_update_palette() - set or schedule a palette update.
451 * @sfb: The hardware information.
452 * @win: The window being updated.
453 * @reg: The palette index being changed.
454 * @value: The computed palette value.
455 *
456 * Change the value of a palette register, either by directly writing to
457 * the palette (this requires the palette RAM to be disconnected from the
458 * hardware whilst this is in progress) or schedule the update for later.
459 *
460 * At the moment, since we have no VSYNC interrupt support, we simply set
461 * the palette entry directly.
462 */
463static void s3c_fb_update_palette(struct s3c_fb *sfb,
464 struct s3c_fb_win *win,
465 unsigned int reg,
466 u32 value)
467{
468 void __iomem *palreg;
469 u32 palcon;
470
471 palreg = sfb->regs + s3c_fb_pal_reg(win->index, reg);
472
473 dev_dbg(sfb->dev, "%s: win %d, reg %d (%p): %08x\n",
474 __func__, win->index, reg, palreg, value);
475
476 win->palette_buffer[reg] = value;
477
478 palcon = readl(sfb->regs + WPALCON);
479 writel(palcon | WPALCON_PAL_UPDATE, sfb->regs + WPALCON);
480
481 if (s3c_fb_pal_is16(win->index))
482 writew(value, palreg);
483 else
484 writel(value, palreg);
485
486 writel(palcon, sfb->regs + WPALCON);
487}
488
489static inline unsigned int chan_to_field(unsigned int chan,
490 struct fb_bitfield *bf)
491{
492 chan &= 0xffff;
493 chan >>= 16 - bf->length;
494 return chan << bf->offset;
495}
496
497/**
498 * s3c_fb_setcolreg() - framebuffer layer request to change palette.
499 * @regno: The palette index to change.
500 * @red: The red field for the palette data.
501 * @green: The green field for the palette data.
502 * @blue: The blue field for the palette data.
503 * @trans: The transparency (alpha) field for the palette data.
504 * @info: The framebuffer being changed.
505 */
506static int s3c_fb_setcolreg(unsigned regno,
507 unsigned red, unsigned green, unsigned blue,
508 unsigned transp, struct fb_info *info)
509{
510 struct s3c_fb_win *win = info->par;
511 struct s3c_fb *sfb = win->parent;
512 unsigned int val;
513
514 dev_dbg(sfb->dev, "%s: win %d: %d => rgb=%d/%d/%d\n",
515 __func__, win->index, regno, red, green, blue);
516
517 switch (info->fix.visual) {
518 case FB_VISUAL_TRUECOLOR:
519 /* true-colour, use pseudo-palette */
520
521 if (regno < 16) {
522 u32 *pal = info->pseudo_palette;
523
524 val = chan_to_field(red, &info->var.red);
525 val |= chan_to_field(green, &info->var.green);
526 val |= chan_to_field(blue, &info->var.blue);
527
528 pal[regno] = val;
529 }
530 break;
531
532 case FB_VISUAL_PSEUDOCOLOR:
533 if (regno < s3c_fb_win_pal_size(win->index)) {
534 val = chan_to_field(red, &win->palette.r);
535 val |= chan_to_field(green, &win->palette.g);
536 val |= chan_to_field(blue, &win->palette.b);
537
538 s3c_fb_update_palette(sfb, win, regno, val);
539 }
540
541 break;
542
543 default:
544 return 1; /* unknown type */
545 }
546
547 return 0;
548}
549
550/**
551 * s3c_fb_enable() - Set the state of the main LCD output
552 * @sfb: The main framebuffer state.
553 * @enable: The state to set.
554 */
555static void s3c_fb_enable(struct s3c_fb *sfb, int enable)
556{
557 u32 vidcon0 = readl(sfb->regs + VIDCON0);
558
559 if (enable)
560 vidcon0 |= VIDCON0_ENVID | VIDCON0_ENVID_F;
561 else {
562 /* see the note in the framebuffer datasheet about
563 * why you cannot take both of these bits down at the
564 * same time. */
565
566 if (!(vidcon0 & VIDCON0_ENVID))
567 return;
568
569 vidcon0 |= VIDCON0_ENVID;
570 vidcon0 &= ~VIDCON0_ENVID_F;
571 }
572
573 writel(vidcon0, sfb->regs + VIDCON0);
574}
575
576/**
577 * s3c_fb_blank() - blank or unblank the given window
578 * @blank_mode: The blank state from FB_BLANK_*
579 * @info: The framebuffer to blank.
580 *
581 * Framebuffer layer request to change the power state.
582 */
583static int s3c_fb_blank(int blank_mode, struct fb_info *info)
584{
585 struct s3c_fb_win *win = info->par;
586 struct s3c_fb *sfb = win->parent;
587 unsigned int index = win->index;
588 u32 wincon;
589
590 dev_dbg(sfb->dev, "blank mode %d\n", blank_mode);
591
592 wincon = readl(sfb->regs + WINCON(index));
593
594 switch (blank_mode) {
595 case FB_BLANK_POWERDOWN:
596 wincon &= ~WINCONx_ENWIN;
597 sfb->enabled &= ~(1 << index);
598 /* fall through to FB_BLANK_NORMAL */
599
600 case FB_BLANK_NORMAL:
601 /* disable the DMA and display 0x0 (black) */
602 writel(WINxMAP_MAP | WINxMAP_MAP_COLOUR(0x0),
603 sfb->regs + WINxMAP(index));
604 break;
605
606 case FB_BLANK_UNBLANK:
607 writel(0x0, sfb->regs + WINxMAP(index));
608 wincon |= WINCONx_ENWIN;
609 sfb->enabled |= (1 << index);
610 break;
611
612 case FB_BLANK_VSYNC_SUSPEND:
613 case FB_BLANK_HSYNC_SUSPEND:
614 default:
615 return 1;
616 }
617
618 writel(wincon, sfb->regs + WINCON(index));
619
620 /* Check the enabled state to see if we need to be running the
621 * main LCD interface, as if there are no active windows then
622 * it is highly likely that we also do not need to output
623 * anything.
624 */
625
626 /* We could do something like the following code, but the current
627 * system of using framebuffer events means that we cannot make
628 * the distinction between just window 0 being inactive and all
629 * the windows being down.
630 *
631 * s3c_fb_enable(sfb, sfb->enabled ? 1 : 0);
632 */
633
634 /* we're stuck with this until we can do something about overriding
635 * the power control using the blanking event for a single fb.
636 */
637 if (index == 0)
638 s3c_fb_enable(sfb, blank_mode != FB_BLANK_POWERDOWN ? 1 : 0);
639
640 return 0;
641}
642
643static struct fb_ops s3c_fb_ops = {
644 .owner = THIS_MODULE,
645 .fb_check_var = s3c_fb_check_var,
646 .fb_set_par = s3c_fb_set_par,
647 .fb_blank = s3c_fb_blank,
648 .fb_setcolreg = s3c_fb_setcolreg,
649 .fb_fillrect = cfb_fillrect,
650 .fb_copyarea = cfb_copyarea,
651 .fb_imageblit = cfb_imageblit,
652};
653
654/**
655 * s3c_fb_alloc_memory() - allocate display memory for framebuffer window
656 * @sfb: The base resources for the hardware.
657 * @win: The window to initialise memory for.
658 *
659 * Allocate memory for the given framebuffer.
660 */
661static int __devinit s3c_fb_alloc_memory(struct s3c_fb *sfb,
662 struct s3c_fb_win *win)
663{
664 struct s3c_fb_pd_win *windata = win->windata;
665 unsigned int real_size, virt_size, size;
666 struct fb_info *fbi = win->fbinfo;
667 dma_addr_t map_dma;
668
669 dev_dbg(sfb->dev, "allocating memory for display\n");
670
671 real_size = windata->win_mode.xres * windata->win_mode.yres;
672 virt_size = windata->virtual_x * windata->virtual_y;
673
674 dev_dbg(sfb->dev, "real_size=%u (%u.%u), virt_size=%u (%u.%u)\n",
675 real_size, windata->win_mode.xres, windata->win_mode.yres,
676 virt_size, windata->virtual_x, windata->virtual_y);
677
678 size = (real_size > virt_size) ? real_size : virt_size;
679 size *= (windata->max_bpp > 16) ? 32 : windata->max_bpp;
680 size /= 8;
681
682 fbi->fix.smem_len = size;
683 size = PAGE_ALIGN(size);
684
685 dev_dbg(sfb->dev, "want %u bytes for window\n", size);
686
687 fbi->screen_base = dma_alloc_writecombine(sfb->dev, size,
688 &map_dma, GFP_KERNEL);
689 if (!fbi->screen_base)
690 return -ENOMEM;
691
692 dev_dbg(sfb->dev, "mapped %x to %p\n",
693 (unsigned int)map_dma, fbi->screen_base);
694
695 memset(fbi->screen_base, 0x0, size);
696 fbi->fix.smem_start = map_dma;
697
698 return 0;
699}
700
701/**
702 * s3c_fb_free_memory() - free the display memory for the given window
703 * @sfb: The base resources for the hardware.
704 * @win: The window to free the display memory for.
705 *
706 * Free the display memory allocated by s3c_fb_alloc_memory().
707 */
708static void s3c_fb_free_memory(struct s3c_fb *sfb, struct s3c_fb_win *win)
709{
710 struct fb_info *fbi = win->fbinfo;
711
712 dma_free_writecombine(sfb->dev, PAGE_ALIGN(fbi->fix.smem_len),
713 fbi->screen_base, fbi->fix.smem_start);
714}
715
716/**
717 * s3c_fb_release_win() - release resources for a framebuffer window.
718 * @win: The window to cleanup the resources for.
719 *
720 * Release the resources that where claimed for the hardware window,
721 * such as the framebuffer instance and any memory claimed for it.
722 */
723static void s3c_fb_release_win(struct s3c_fb *sfb, struct s3c_fb_win *win)
724{
Krzysztof Heltddc518d2009-06-16 15:34:33 -0700725 if (win->fbinfo) {
726 unregister_framebuffer(win->fbinfo);
727 fb_dealloc_cmap(&win->fbinfo->cmap);
728 s3c_fb_free_memory(sfb, win);
729 framebuffer_release(win->fbinfo);
730 }
Ben Dooksec549a02009-03-31 15:25:39 -0700731}
732
733/**
734 * s3c_fb_probe_win() - register an hardware window
735 * @sfb: The base resources for the hardware
736 * @res: Pointer to where to place the resultant window.
737 *
738 * Allocate and do the basic initialisation for one of the hardware's graphics
739 * windows.
740 */
741static int __devinit s3c_fb_probe_win(struct s3c_fb *sfb, unsigned int win_no,
742 struct s3c_fb_win **res)
743{
744 struct fb_var_screeninfo *var;
745 struct fb_videomode *initmode;
746 struct s3c_fb_pd_win *windata;
747 struct s3c_fb_win *win;
748 struct fb_info *fbinfo;
749 int palette_size;
750 int ret;
751
752 dev_dbg(sfb->dev, "probing window %d\n", win_no);
753
754 palette_size = s3c_fb_win_pal_size(win_no);
755
756 fbinfo = framebuffer_alloc(sizeof(struct s3c_fb_win) +
757 palette_size * sizeof(u32), sfb->dev);
758 if (!fbinfo) {
759 dev_err(sfb->dev, "failed to allocate framebuffer\n");
760 return -ENOENT;
761 }
762
763 windata = sfb->pdata->win[win_no];
764 initmode = &windata->win_mode;
765
766 WARN_ON(windata->max_bpp == 0);
767 WARN_ON(windata->win_mode.xres == 0);
768 WARN_ON(windata->win_mode.yres == 0);
769
770 win = fbinfo->par;
771 var = &fbinfo->var;
772 win->fbinfo = fbinfo;
773 win->parent = sfb;
774 win->windata = windata;
775 win->index = win_no;
776 win->palette_buffer = (u32 *)(win + 1);
777
778 ret = s3c_fb_alloc_memory(sfb, win);
779 if (ret) {
780 dev_err(sfb->dev, "failed to allocate display memory\n");
Krzysztof Heltddc518d2009-06-16 15:34:33 -0700781 return ret;
Ben Dooksec549a02009-03-31 15:25:39 -0700782 }
783
784 /* setup the r/b/g positions for the window's palette */
785 s3c_fb_init_palette(win_no, &win->palette);
786
787 /* setup the initial video mode from the window */
788 fb_videomode_to_var(&fbinfo->var, initmode);
789
790 fbinfo->fix.type = FB_TYPE_PACKED_PIXELS;
791 fbinfo->fix.accel = FB_ACCEL_NONE;
792 fbinfo->var.activate = FB_ACTIVATE_NOW;
793 fbinfo->var.vmode = FB_VMODE_NONINTERLACED;
794 fbinfo->var.bits_per_pixel = windata->default_bpp;
795 fbinfo->fbops = &s3c_fb_ops;
796 fbinfo->flags = FBINFO_FLAG_DEFAULT;
797 fbinfo->pseudo_palette = &win->pseudo_palette;
798
799 /* prepare to actually start the framebuffer */
800
801 ret = s3c_fb_check_var(&fbinfo->var, fbinfo);
802 if (ret < 0) {
803 dev_err(sfb->dev, "check_var failed on initial video params\n");
Krzysztof Heltddc518d2009-06-16 15:34:33 -0700804 return ret;
Ben Dooksec549a02009-03-31 15:25:39 -0700805 }
806
807 /* create initial colour map */
808
809 ret = fb_alloc_cmap(&fbinfo->cmap, s3c_fb_win_pal_size(win_no), 1);
810 if (ret == 0)
811 fb_set_cmap(&fbinfo->cmap, fbinfo);
812 else
813 dev_err(sfb->dev, "failed to allocate fb cmap\n");
814
815 s3c_fb_set_par(fbinfo);
816
817 dev_dbg(sfb->dev, "about to register framebuffer\n");
818
819 /* run the check_var and set_par on our configuration. */
820
821 ret = register_framebuffer(fbinfo);
822 if (ret < 0) {
823 dev_err(sfb->dev, "failed to register framebuffer\n");
Krzysztof Heltddc518d2009-06-16 15:34:33 -0700824 return ret;
Ben Dooksec549a02009-03-31 15:25:39 -0700825 }
826
827 *res = win;
828 dev_info(sfb->dev, "window %d: fb %s\n", win_no, fbinfo->fix.id);
829
830 return 0;
Ben Dooksec549a02009-03-31 15:25:39 -0700831}
832
833/**
834 * s3c_fb_clear_win() - clear hardware window registers.
835 * @sfb: The base resources for the hardware.
836 * @win: The window to process.
837 *
838 * Reset the specific window registers to a known state.
839 */
840static void s3c_fb_clear_win(struct s3c_fb *sfb, int win)
841{
842 void __iomem *regs = sfb->regs;
843
844 writel(0, regs + WINCON(win));
845 writel(0xffffff, regs + WxKEYCONy(win, 0));
846 writel(0xffffff, regs + WxKEYCONy(win, 1));
847
848 writel(0, regs + VIDOSD_A(win));
849 writel(0, regs + VIDOSD_B(win));
850 writel(0, regs + VIDOSD_C(win));
851}
852
853static int __devinit s3c_fb_probe(struct platform_device *pdev)
854{
855 struct device *dev = &pdev->dev;
856 struct s3c_fb_platdata *pd;
857 struct s3c_fb *sfb;
858 struct resource *res;
859 int win;
860 int ret = 0;
861
862 pd = pdev->dev.platform_data;
863 if (!pd) {
864 dev_err(dev, "no platform data specified\n");
865 return -EINVAL;
866 }
867
868 sfb = kzalloc(sizeof(struct s3c_fb), GFP_KERNEL);
869 if (!sfb) {
870 dev_err(dev, "no memory for framebuffers\n");
871 return -ENOMEM;
872 }
873
874 sfb->dev = dev;
875 sfb->pdata = pd;
876
877 sfb->bus_clk = clk_get(dev, "lcd");
878 if (IS_ERR(sfb->bus_clk)) {
879 dev_err(dev, "failed to get bus clock\n");
880 goto err_sfb;
881 }
882
883 clk_enable(sfb->bus_clk);
884
885 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
886 if (!res) {
887 dev_err(dev, "failed to find registers\n");
888 ret = -ENOENT;
889 goto err_clk;
890 }
891
892 sfb->regs_res = request_mem_region(res->start, resource_size(res),
893 dev_name(dev));
894 if (!sfb->regs_res) {
895 dev_err(dev, "failed to claim register region\n");
896 ret = -ENOENT;
897 goto err_clk;
898 }
899
900 sfb->regs = ioremap(res->start, resource_size(res));
901 if (!sfb->regs) {
902 dev_err(dev, "failed to map registers\n");
903 ret = -ENXIO;
904 goto err_req_region;
905 }
906
907 dev_dbg(dev, "got resources (regs %p), probing windows\n", sfb->regs);
908
909 /* setup gpio and output polarity controls */
910
911 pd->setup_gpio();
912
913 writel(pd->vidcon1, sfb->regs + VIDCON1);
914
915 /* zero all windows before we do anything */
916
917 for (win = 0; win < S3C_FB_MAX_WIN; win++)
918 s3c_fb_clear_win(sfb, win);
919
920 /* we have the register setup, start allocating framebuffers */
921
922 for (win = 0; win < S3C_FB_MAX_WIN; win++) {
923 if (!pd->win[win])
924 continue;
925
926 ret = s3c_fb_probe_win(sfb, win, &sfb->windows[win]);
927 if (ret < 0) {
928 dev_err(dev, "failed to create window %d\n", win);
929 for (; win >= 0; win--)
930 s3c_fb_release_win(sfb, sfb->windows[win]);
931 goto err_ioremap;
932 }
933 }
934
935 platform_set_drvdata(pdev, sfb);
936
937 return 0;
938
939err_ioremap:
940 iounmap(sfb->regs);
941
942err_req_region:
943 release_resource(sfb->regs_res);
944 kfree(sfb->regs_res);
945
946err_clk:
947 clk_disable(sfb->bus_clk);
948 clk_put(sfb->bus_clk);
949
950err_sfb:
951 kfree(sfb);
952 return ret;
953}
954
955/**
956 * s3c_fb_remove() - Cleanup on module finalisation
957 * @pdev: The platform device we are bound to.
958 *
959 * Shutdown and then release all the resources that the driver allocated
960 * on initialisation.
961 */
962static int __devexit s3c_fb_remove(struct platform_device *pdev)
963{
964 struct s3c_fb *sfb = platform_get_drvdata(pdev);
965 int win;
966
Pawel Osciakc42b1102009-07-29 15:02:10 -0700967 for (win = 0; win < S3C_FB_MAX_WIN; win++)
Marek Szyprowski17663e52009-05-28 14:34:35 -0700968 if (sfb->windows[win])
969 s3c_fb_release_win(sfb, sfb->windows[win]);
Ben Dooksec549a02009-03-31 15:25:39 -0700970
971 iounmap(sfb->regs);
972
973 clk_disable(sfb->bus_clk);
974 clk_put(sfb->bus_clk);
975
976 release_resource(sfb->regs_res);
977 kfree(sfb->regs_res);
978
979 kfree(sfb);
980
981 return 0;
982}
983
984#ifdef CONFIG_PM
985static int s3c_fb_suspend(struct platform_device *pdev, pm_message_t state)
986{
987 struct s3c_fb *sfb = platform_get_drvdata(pdev);
988 struct s3c_fb_win *win;
989 int win_no;
990
Pawel Osciakc42b1102009-07-29 15:02:10 -0700991 for (win_no = S3C_FB_MAX_WIN - 1; win_no >= 0; win_no--) {
Ben Dooksec549a02009-03-31 15:25:39 -0700992 win = sfb->windows[win_no];
993 if (!win)
994 continue;
995
996 /* use the blank function to push into power-down */
997 s3c_fb_blank(FB_BLANK_POWERDOWN, win->fbinfo);
998 }
999
1000 clk_disable(sfb->bus_clk);
1001 return 0;
1002}
1003
1004static int s3c_fb_resume(struct platform_device *pdev)
1005{
1006 struct s3c_fb *sfb = platform_get_drvdata(pdev);
Marek Szyprowski17663e52009-05-28 14:34:35 -07001007 struct s3c_fb_platdata *pd = sfb->pdata;
Ben Dooksec549a02009-03-31 15:25:39 -07001008 struct s3c_fb_win *win;
1009 int win_no;
1010
1011 clk_enable(sfb->bus_clk);
1012
Marek Szyprowski17663e52009-05-28 14:34:35 -07001013 /* setup registers */
1014 writel(pd->vidcon1, sfb->regs + VIDCON1);
1015
1016 /* zero all windows before we do anything */
1017 for (win_no = 0; win_no < S3C_FB_MAX_WIN; win_no++)
1018 s3c_fb_clear_win(sfb, win_no);
1019
1020 /* restore framebuffers */
Ben Dooksec549a02009-03-31 15:25:39 -07001021 for (win_no = 0; win_no < S3C_FB_MAX_WIN; win_no++) {
1022 win = sfb->windows[win_no];
1023 if (!win)
1024 continue;
1025
1026 dev_dbg(&pdev->dev, "resuming window %d\n", win_no);
1027 s3c_fb_set_par(win->fbinfo);
1028 }
1029
1030 return 0;
1031}
1032#else
1033#define s3c_fb_suspend NULL
1034#define s3c_fb_resume NULL
1035#endif
1036
1037static struct platform_driver s3c_fb_driver = {
1038 .probe = s3c_fb_probe,
1039 .remove = s3c_fb_remove,
1040 .suspend = s3c_fb_suspend,
1041 .resume = s3c_fb_resume,
1042 .driver = {
1043 .name = "s3c-fb",
1044 .owner = THIS_MODULE,
1045 },
1046};
1047
1048static int __init s3c_fb_init(void)
1049{
1050 return platform_driver_register(&s3c_fb_driver);
1051}
1052
1053static void __exit s3c_fb_cleanup(void)
1054{
1055 platform_driver_unregister(&s3c_fb_driver);
1056}
1057
1058module_init(s3c_fb_init);
1059module_exit(s3c_fb_cleanup);
1060
1061MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
1062MODULE_DESCRIPTION("Samsung S3C SoC Framebuffer driver");
1063MODULE_LICENSE("GPL");
1064MODULE_ALIAS("platform:s3c-fb");