1 /* linux/drivers/video/s3c-fb.c
3 * Copyright 2008 Openmoko Inc.
4 * Copyright 2008 Simtec Electronics
5 * Ben Dooks <ben@simtec.co.uk>
6 * http://armlinux.simtec.co.uk/
8 * Samsung SoC Framebuffer driver
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.
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/slab.h>
20 #include <linux/init.h>
21 #include <linux/clk.h>
26 #include <mach/regs-fb.h>
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.
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.
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
44 #ifdef CONFIG_FB_S3C_DEBUG_REGWRITE
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 */
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.
64 struct s3c_fb_pd_win *windata;
65 struct s3c_fb *parent;
66 struct fb_info *fbinfo;
67 struct s3c_fb_palette palette;
70 u32 pseudo_palette[16];
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.
86 struct resource *regs_res;
90 unsigned char enabled;
92 struct s3c_fb_platdata *pdata;
93 struct s3c_fb_win *windows[S3C_FB_MAX_WIN];
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.
101 * Work out if the given window supports palletised data at the specified bpp.
103 static int s3c_fb_win_has_palette(unsigned int win, unsigned int bpp)
105 return s3c_fb_win_pal_size(win) <= (1 << bpp);
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.
113 * Framebuffer layer call to verify the given information and allow us to
114 * update various information depending on the hardware capabilities.
116 static int s3c_fb_check_var(struct fb_var_screeninfo *var,
117 struct fb_info *info)
119 struct s3c_fb_win *win = info->par;
120 struct s3c_fb_pd_win *windata = win->windata;
121 struct s3c_fb *sfb = win->parent;
123 dev_dbg(sfb->dev, "checking parameters\n");
125 var->xres_virtual = max((unsigned int)windata->virtual_x, var->xres);
126 var->yres_virtual = max((unsigned int)windata->virtual_y, var->yres);
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);
134 /* always ensure these are zero, for drop through cases below */
135 var->transp.offset = 0;
136 var->transp.length = 0;
138 switch (var->bits_per_pixel) {
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 */
146 var->green.offset = 2;
147 var->blue.offset = 0;
149 var->green.length = 3;
150 var->blue.length = 2;
151 var->transp.offset = 7;
152 var->transp.length = 1;
155 var->red.length = var->bits_per_pixel;
156 var->green = var->red;
157 var->blue = var->red;
162 /* 666 with one bit alpha/transparency */
163 var->transp.offset = 18;
164 var->transp.length = 1;
166 var->bits_per_pixel = 32;
169 var->red.offset = 12;
170 var->green.offset = 6;
171 var->blue.offset = 0;
173 var->green.length = 6;
174 var->blue.length = 6;
178 /* 16 bpp, 565 format */
179 var->red.offset = 11;
180 var->green.offset = 5;
181 var->blue.offset = 0;
183 var->green.length = 6;
184 var->blue.length = 5;
189 var->transp.length = var->bits_per_pixel - 24;
190 var->transp.offset = 24;
193 /* our 24bpp is unpacked, so 32bpp */
194 var->bits_per_pixel = 32;
196 var->red.offset = 16;
198 var->green.offset = 8;
199 var->green.length = 8;
200 var->blue.offset = 0;
201 var->blue.length = 8;
205 dev_err(sfb->dev, "invalid bpp\n");
208 dev_dbg(sfb->dev, "%s: verified parameters\n", __func__);
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.
217 * Given the specified pixel clock, work out the necessary divider to get
218 * close to the output frequency.
220 static int s3c_fb_calc_pixclk(struct s3c_fb *sfb, unsigned int pixclk)
222 unsigned long clk = clk_get_rate(sfb->bus_clk);
223 unsigned long long tmp;
226 tmp = (unsigned long long)clk;
229 do_div(tmp, 1000000000UL);
230 result = (unsigned int)tmp / 1000;
232 dev_dbg(sfb->dev, "pixclk=%u, clk=%lu, div=%d (%lu)\n",
233 pixclk, clk, result, clk / result);
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.
243 * Align the given pixel count so that it will start on an 32bit word
246 static int s3c_fb_align_word(unsigned int bpp, unsigned int pix)
253 pix_per_word = (8 * 32) / bpp;
254 return ALIGN(pix, pix_per_word);
258 * s3c_fb_set_par() - framebuffer request to set new framebuffer state.
259 * @info: The framebuffer to change.
261 * Framebuffer layer request to set a new mode for the specified framebuffer
263 static int s3c_fb_set_par(struct fb_info *info)
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;
275 dev_dbg(sfb->dev, "setting framebuffer parameters\n");
277 switch (var->bits_per_pixel) {
282 info->fix.visual = FB_VISUAL_TRUECOLOR;
285 if (s3c_fb_win_has_palette(win_no, 8))
286 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
288 info->fix.visual = FB_VISUAL_TRUECOLOR;
291 info->fix.visual = FB_VISUAL_MONO01;
294 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
298 info->fix.line_length = (var->xres_virtual * var->bits_per_pixel) / 8;
300 /* disable the window whilst we update it */
301 writel(0, regs + WINCON(win_no));
303 /* use platform specified window as the basis for the lcd timings */
305 if (win_no == sfb->pdata->default_win) {
306 clkdiv = s3c_fb_calc_pixclk(sfb, var->pixclock);
308 data = sfb->pdata->vidcon0;
309 data &= ~(VIDCON0_CLKVAL_F_MASK | VIDCON0_CLKDIR);
312 data |= VIDCON0_CLKVAL_F(clkdiv-1) | VIDCON0_CLKDIR;
314 data &= ~VIDCON0_CLKDIR; /* 1:1 clock */
316 /* write the timing data to the panel */
318 data |= VIDCON0_ENVID | VIDCON0_ENVID_F;
319 writel(data, regs + VIDCON0);
321 data = VIDTCON0_VBPD(var->upper_margin - 1) |
322 VIDTCON0_VFPD(var->lower_margin - 1) |
323 VIDTCON0_VSPW(var->vsync_len - 1);
325 writel(data, regs + VIDTCON0);
327 data = VIDTCON1_HBPD(var->left_margin - 1) |
328 VIDTCON1_HFPD(var->right_margin - 1) |
329 VIDTCON1_HSPW(var->hsync_len - 1);
331 writel(data, regs + VIDTCON1);
333 data = VIDTCON2_LINEVAL(var->yres - 1) |
334 VIDTCON2_HOZVAL(var->xres - 1);
335 writel(data, regs + VIDTCON2);
338 /* write the buffer address */
340 writel(info->fix.smem_start, regs + VIDW_BUF_START(win_no));
342 data = info->fix.smem_start + info->fix.line_length * var->yres;
343 writel(data, regs + VIDW_BUF_END(win_no));
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));
350 /* write 'OSD' registers to control position of framebuffer */
352 data = VIDOSDxA_TOPLEFT_X(0) | VIDOSDxA_TOPLEFT_Y(0);
353 writel(data, regs + VIDOSD_A(win_no));
355 data = VIDOSDxB_BOTRIGHT_X(s3c_fb_align_word(var->bits_per_pixel,
357 VIDOSDxB_BOTRIGHT_Y(var->yres - 1);
359 writel(data, regs + VIDOSD_B(win_no));
361 data = var->xres * var->yres;
363 osdc_data = VIDISD14C_ALPHA1_R(0xf) |
364 VIDISD14C_ALPHA1_G(0xf) |
365 VIDISD14C_ALPHA1_B(0xf);
367 if (s3c_fb_has_osd_d(win_no)) {
368 writel(data, regs + VIDOSD_D(win_no));
369 writel(osdc_data, regs + VIDOSD_C(win_no));
371 writel(data, regs + VIDOSD_C(win_no));
373 data = WINCONx_ENWIN;
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. */
379 switch (var->bits_per_pixel) {
381 data |= WINCON0_BPPMODE_1BPP;
382 data |= WINCONx_BITSWP;
383 data |= WINCONx_BURSTLEN_4WORD;
386 data |= WINCON0_BPPMODE_2BPP;
387 data |= WINCONx_BITSWP;
388 data |= WINCONx_BURSTLEN_8WORD;
391 data |= WINCON0_BPPMODE_4BPP;
392 data |= WINCONx_BITSWP;
393 data |= WINCONx_BURSTLEN_8WORD;
396 if (var->transp.length != 0)
397 data |= WINCON1_BPPMODE_8BPP_1232;
399 data |= WINCON0_BPPMODE_8BPP_PALETTE;
400 data |= WINCONx_BURSTLEN_8WORD;
401 data |= WINCONx_BYTSWP;
404 if (var->transp.length != 0)
405 data |= WINCON1_BPPMODE_16BPP_A1555;
407 data |= WINCON0_BPPMODE_16BPP_565;
408 data |= WINCONx_HAWSWP;
409 data |= WINCONx_BURSTLEN_16WORD;
413 if (var->red.length == 6) {
414 if (var->transp.length != 0)
415 data |= WINCON1_BPPMODE_19BPP_A1666;
417 data |= WINCON1_BPPMODE_18BPP_666;
418 } else if (var->transp.length == 1)
419 data |= WINCON1_BPPMODE_25BPP_A1888
421 else if (var->transp.length == 4)
422 data |= WINCON1_BPPMODE_28BPP_A4888
423 | WINCON1_BLD_PIX | WINCON1_ALPHA_SEL;
425 data |= WINCON0_BPPMODE_24BPP_888;
427 data |= WINCONx_WSWP;
428 data |= WINCONx_BURSTLEN_16WORD;
432 /* It has no color key control register for window0 */
434 u32 keycon0_data = 0, keycon1_data = 0;
436 keycon0_data = ~(WxKEYCON0_KEYBL_EN |
438 WxKEYCON0_DIRCON) | WxKEYCON0_COMPKEY(0);
440 keycon1_data = WxKEYCON1_COLVAL(0xffffff);
442 writel(keycon0_data, regs + WxKEYCONy(win_no-1, 0));
443 writel(keycon1_data, regs + WxKEYCONy(win_no-1, 1));
446 writel(data, regs + WINCON(win_no));
447 writel(0x0, regs + WINxMAP(win_no));
453 * s3c_fb_update_palette() - set or schedule a palette update.
454 * @sfb: The hardware information.
455 * @win: The window being updated.
456 * @reg: The palette index being changed.
457 * @value: The computed palette value.
459 * Change the value of a palette register, either by directly writing to
460 * the palette (this requires the palette RAM to be disconnected from the
461 * hardware whilst this is in progress) or schedule the update for later.
463 * At the moment, since we have no VSYNC interrupt support, we simply set
464 * the palette entry directly.
466 static void s3c_fb_update_palette(struct s3c_fb *sfb,
467 struct s3c_fb_win *win,
471 void __iomem *palreg;
474 palreg = sfb->regs + s3c_fb_pal_reg(win->index, reg);
476 dev_dbg(sfb->dev, "%s: win %d, reg %d (%p): %08x\n",
477 __func__, win->index, reg, palreg, value);
479 win->palette_buffer[reg] = value;
481 palcon = readl(sfb->regs + WPALCON);
482 writel(palcon | WPALCON_PAL_UPDATE, sfb->regs + WPALCON);
484 if (s3c_fb_pal_is16(win->index))
485 writew(value, palreg);
487 writel(value, palreg);
489 writel(palcon, sfb->regs + WPALCON);
492 static inline unsigned int chan_to_field(unsigned int chan,
493 struct fb_bitfield *bf)
496 chan >>= 16 - bf->length;
497 return chan << bf->offset;
501 * s3c_fb_setcolreg() - framebuffer layer request to change palette.
502 * @regno: The palette index to change.
503 * @red: The red field for the palette data.
504 * @green: The green field for the palette data.
505 * @blue: The blue field for the palette data.
506 * @trans: The transparency (alpha) field for the palette data.
507 * @info: The framebuffer being changed.
509 static int s3c_fb_setcolreg(unsigned regno,
510 unsigned red, unsigned green, unsigned blue,
511 unsigned transp, struct fb_info *info)
513 struct s3c_fb_win *win = info->par;
514 struct s3c_fb *sfb = win->parent;
517 dev_dbg(sfb->dev, "%s: win %d: %d => rgb=%d/%d/%d\n",
518 __func__, win->index, regno, red, green, blue);
520 switch (info->fix.visual) {
521 case FB_VISUAL_TRUECOLOR:
522 /* true-colour, use pseudo-palette */
525 u32 *pal = info->pseudo_palette;
527 val = chan_to_field(red, &info->var.red);
528 val |= chan_to_field(green, &info->var.green);
529 val |= chan_to_field(blue, &info->var.blue);
535 case FB_VISUAL_PSEUDOCOLOR:
536 if (regno < s3c_fb_win_pal_size(win->index)) {
537 val = chan_to_field(red, &win->palette.r);
538 val |= chan_to_field(green, &win->palette.g);
539 val |= chan_to_field(blue, &win->palette.b);
541 s3c_fb_update_palette(sfb, win, regno, val);
547 return 1; /* unknown type */
554 * s3c_fb_enable() - Set the state of the main LCD output
555 * @sfb: The main framebuffer state.
556 * @enable: The state to set.
558 static void s3c_fb_enable(struct s3c_fb *sfb, int enable)
560 u32 vidcon0 = readl(sfb->regs + VIDCON0);
563 vidcon0 |= VIDCON0_ENVID | VIDCON0_ENVID_F;
565 /* see the note in the framebuffer datasheet about
566 * why you cannot take both of these bits down at the
569 if (!(vidcon0 & VIDCON0_ENVID))
572 vidcon0 |= VIDCON0_ENVID;
573 vidcon0 &= ~VIDCON0_ENVID_F;
576 writel(vidcon0, sfb->regs + VIDCON0);
580 * s3c_fb_blank() - blank or unblank the given window
581 * @blank_mode: The blank state from FB_BLANK_*
582 * @info: The framebuffer to blank.
584 * Framebuffer layer request to change the power state.
586 static int s3c_fb_blank(int blank_mode, struct fb_info *info)
588 struct s3c_fb_win *win = info->par;
589 struct s3c_fb *sfb = win->parent;
590 unsigned int index = win->index;
593 dev_dbg(sfb->dev, "blank mode %d\n", blank_mode);
595 wincon = readl(sfb->regs + WINCON(index));
597 switch (blank_mode) {
598 case FB_BLANK_POWERDOWN:
599 wincon &= ~WINCONx_ENWIN;
600 sfb->enabled &= ~(1 << index);
601 /* fall through to FB_BLANK_NORMAL */
603 case FB_BLANK_NORMAL:
604 /* disable the DMA and display 0x0 (black) */
605 writel(WINxMAP_MAP | WINxMAP_MAP_COLOUR(0x0),
606 sfb->regs + WINxMAP(index));
609 case FB_BLANK_UNBLANK:
610 writel(0x0, sfb->regs + WINxMAP(index));
611 wincon |= WINCONx_ENWIN;
612 sfb->enabled |= (1 << index);
615 case FB_BLANK_VSYNC_SUSPEND:
616 case FB_BLANK_HSYNC_SUSPEND:
621 writel(wincon, sfb->regs + WINCON(index));
623 /* Check the enabled state to see if we need to be running the
624 * main LCD interface, as if there are no active windows then
625 * it is highly likely that we also do not need to output
629 /* We could do something like the following code, but the current
630 * system of using framebuffer events means that we cannot make
631 * the distinction between just window 0 being inactive and all
632 * the windows being down.
634 * s3c_fb_enable(sfb, sfb->enabled ? 1 : 0);
637 /* we're stuck with this until we can do something about overriding
638 * the power control using the blanking event for a single fb.
640 if (index == sfb->pdata->default_win)
641 s3c_fb_enable(sfb, blank_mode != FB_BLANK_POWERDOWN ? 1 : 0);
646 static struct fb_ops s3c_fb_ops = {
647 .owner = THIS_MODULE,
648 .fb_check_var = s3c_fb_check_var,
649 .fb_set_par = s3c_fb_set_par,
650 .fb_blank = s3c_fb_blank,
651 .fb_setcolreg = s3c_fb_setcolreg,
652 .fb_fillrect = cfb_fillrect,
653 .fb_copyarea = cfb_copyarea,
654 .fb_imageblit = cfb_imageblit,
658 * s3c_fb_alloc_memory() - allocate display memory for framebuffer window
659 * @sfb: The base resources for the hardware.
660 * @win: The window to initialise memory for.
662 * Allocate memory for the given framebuffer.
664 static int __devinit s3c_fb_alloc_memory(struct s3c_fb *sfb,
665 struct s3c_fb_win *win)
667 struct s3c_fb_pd_win *windata = win->windata;
668 unsigned int real_size, virt_size, size;
669 struct fb_info *fbi = win->fbinfo;
672 dev_dbg(sfb->dev, "allocating memory for display\n");
674 real_size = windata->win_mode.xres * windata->win_mode.yres;
675 virt_size = windata->virtual_x * windata->virtual_y;
677 dev_dbg(sfb->dev, "real_size=%u (%u.%u), virt_size=%u (%u.%u)\n",
678 real_size, windata->win_mode.xres, windata->win_mode.yres,
679 virt_size, windata->virtual_x, windata->virtual_y);
681 size = (real_size > virt_size) ? real_size : virt_size;
682 size *= (windata->max_bpp > 16) ? 32 : windata->max_bpp;
685 fbi->fix.smem_len = size;
686 size = PAGE_ALIGN(size);
688 dev_dbg(sfb->dev, "want %u bytes for window\n", size);
690 fbi->screen_base = dma_alloc_writecombine(sfb->dev, size,
691 &map_dma, GFP_KERNEL);
692 if (!fbi->screen_base)
695 dev_dbg(sfb->dev, "mapped %x to %p\n",
696 (unsigned int)map_dma, fbi->screen_base);
698 memset(fbi->screen_base, 0x0, size);
699 fbi->fix.smem_start = map_dma;
705 * s3c_fb_free_memory() - free the display memory for the given window
706 * @sfb: The base resources for the hardware.
707 * @win: The window to free the display memory for.
709 * Free the display memory allocated by s3c_fb_alloc_memory().
711 static void s3c_fb_free_memory(struct s3c_fb *sfb, struct s3c_fb_win *win)
713 struct fb_info *fbi = win->fbinfo;
715 dma_free_writecombine(sfb->dev, PAGE_ALIGN(fbi->fix.smem_len),
716 fbi->screen_base, fbi->fix.smem_start);
720 * s3c_fb_release_win() - release resources for a framebuffer window.
721 * @win: The window to cleanup the resources for.
723 * Release the resources that where claimed for the hardware window,
724 * such as the framebuffer instance and any memory claimed for it.
726 static void s3c_fb_release_win(struct s3c_fb *sfb, struct s3c_fb_win *win)
729 unregister_framebuffer(win->fbinfo);
730 fb_dealloc_cmap(&win->fbinfo->cmap);
731 s3c_fb_free_memory(sfb, win);
732 framebuffer_release(win->fbinfo);
737 * s3c_fb_probe_win() - register an hardware window
738 * @sfb: The base resources for the hardware
739 * @res: Pointer to where to place the resultant window.
741 * Allocate and do the basic initialisation for one of the hardware's graphics
744 static int __devinit s3c_fb_probe_win(struct s3c_fb *sfb, unsigned int win_no,
745 struct s3c_fb_win **res)
747 struct fb_var_screeninfo *var;
748 struct fb_videomode *initmode;
749 struct s3c_fb_pd_win *windata;
750 struct s3c_fb_win *win;
751 struct fb_info *fbinfo;
755 dev_dbg(sfb->dev, "probing window %d\n", win_no);
757 palette_size = s3c_fb_win_pal_size(win_no);
759 fbinfo = framebuffer_alloc(sizeof(struct s3c_fb_win) +
760 palette_size * sizeof(u32), sfb->dev);
762 dev_err(sfb->dev, "failed to allocate framebuffer\n");
766 windata = sfb->pdata->win[win_no];
767 initmode = &windata->win_mode;
769 WARN_ON(windata->max_bpp == 0);
770 WARN_ON(windata->win_mode.xres == 0);
771 WARN_ON(windata->win_mode.yres == 0);
775 win->fbinfo = fbinfo;
777 win->windata = windata;
779 win->palette_buffer = (u32 *)(win + 1);
781 ret = s3c_fb_alloc_memory(sfb, win);
783 dev_err(sfb->dev, "failed to allocate display memory\n");
787 /* setup the r/b/g positions for the window's palette */
788 s3c_fb_init_palette(win_no, &win->palette);
790 /* setup the initial video mode from the window */
791 fb_videomode_to_var(&fbinfo->var, initmode);
793 fbinfo->fix.type = FB_TYPE_PACKED_PIXELS;
794 fbinfo->fix.accel = FB_ACCEL_NONE;
795 fbinfo->var.activate = FB_ACTIVATE_NOW;
796 fbinfo->var.vmode = FB_VMODE_NONINTERLACED;
797 fbinfo->var.bits_per_pixel = windata->default_bpp;
798 fbinfo->fbops = &s3c_fb_ops;
799 fbinfo->flags = FBINFO_FLAG_DEFAULT;
800 fbinfo->pseudo_palette = &win->pseudo_palette;
802 /* prepare to actually start the framebuffer */
804 ret = s3c_fb_check_var(&fbinfo->var, fbinfo);
806 dev_err(sfb->dev, "check_var failed on initial video params\n");
810 /* create initial colour map */
812 ret = fb_alloc_cmap(&fbinfo->cmap, s3c_fb_win_pal_size(win_no), 1);
814 fb_set_cmap(&fbinfo->cmap, fbinfo);
816 dev_err(sfb->dev, "failed to allocate fb cmap\n");
818 s3c_fb_set_par(fbinfo);
820 dev_dbg(sfb->dev, "about to register framebuffer\n");
822 /* run the check_var and set_par on our configuration. */
824 ret = register_framebuffer(fbinfo);
826 dev_err(sfb->dev, "failed to register framebuffer\n");
831 dev_info(sfb->dev, "window %d: fb %s\n", win_no, fbinfo->fix.id);
837 * s3c_fb_clear_win() - clear hardware window registers.
838 * @sfb: The base resources for the hardware.
839 * @win: The window to process.
841 * Reset the specific window registers to a known state.
843 static void s3c_fb_clear_win(struct s3c_fb *sfb, int win)
845 void __iomem *regs = sfb->regs;
847 writel(0, regs + WINCON(win));
848 writel(0xffffff, regs + WxKEYCONy(win, 0));
849 writel(0xffffff, regs + WxKEYCONy(win, 1));
851 writel(0, regs + VIDOSD_A(win));
852 writel(0, regs + VIDOSD_B(win));
853 writel(0, regs + VIDOSD_C(win));
856 static int __devinit s3c_fb_probe(struct platform_device *pdev)
858 struct device *dev = &pdev->dev;
859 struct s3c_fb_platdata *pd;
861 struct resource *res;
865 pd = pdev->dev.platform_data;
867 dev_err(dev, "no platform data specified\n");
871 sfb = kzalloc(sizeof(struct s3c_fb), GFP_KERNEL);
873 dev_err(dev, "no memory for framebuffers\n");
880 sfb->bus_clk = clk_get(dev, "lcd");
881 if (IS_ERR(sfb->bus_clk)) {
882 dev_err(dev, "failed to get bus clock\n");
886 clk_enable(sfb->bus_clk);
888 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
890 dev_err(dev, "failed to find registers\n");
895 sfb->regs_res = request_mem_region(res->start, resource_size(res),
897 if (!sfb->regs_res) {
898 dev_err(dev, "failed to claim register region\n");
903 sfb->regs = ioremap(res->start, resource_size(res));
905 dev_err(dev, "failed to map registers\n");
910 dev_dbg(dev, "got resources (regs %p), probing windows\n", sfb->regs);
912 /* setup gpio and output polarity controls */
916 writel(pd->vidcon1, sfb->regs + VIDCON1);
918 /* zero all windows before we do anything */
920 for (win = 0; win < S3C_FB_MAX_WIN; win++)
921 s3c_fb_clear_win(sfb, win);
923 /* we have the register setup, start allocating framebuffers */
925 for (win = 0; win < S3C_FB_MAX_WIN; win++) {
929 ret = s3c_fb_probe_win(sfb, win, &sfb->windows[win]);
931 dev_err(dev, "failed to create window %d\n", win);
932 for (; win >= 0; win--)
933 s3c_fb_release_win(sfb, sfb->windows[win]);
938 platform_set_drvdata(pdev, sfb);
946 release_resource(sfb->regs_res);
947 kfree(sfb->regs_res);
950 clk_disable(sfb->bus_clk);
951 clk_put(sfb->bus_clk);
959 * s3c_fb_remove() - Cleanup on module finalisation
960 * @pdev: The platform device we are bound to.
962 * Shutdown and then release all the resources that the driver allocated
965 static int __devexit s3c_fb_remove(struct platform_device *pdev)
967 struct s3c_fb *sfb = platform_get_drvdata(pdev);
970 for (win = 0; win < S3C_FB_MAX_WIN; win++)
971 if (sfb->windows[win])
972 s3c_fb_release_win(sfb, sfb->windows[win]);
976 clk_disable(sfb->bus_clk);
977 clk_put(sfb->bus_clk);
979 release_resource(sfb->regs_res);
980 kfree(sfb->regs_res);
988 static int s3c_fb_suspend(struct platform_device *pdev, pm_message_t state)
990 struct s3c_fb *sfb = platform_get_drvdata(pdev);
991 struct s3c_fb_win *win;
994 for (win_no = S3C_FB_MAX_WIN - 1; win_no >= 0; win_no--) {
995 win = sfb->windows[win_no];
999 /* use the blank function to push into power-down */
1000 s3c_fb_blank(FB_BLANK_POWERDOWN, win->fbinfo);
1003 clk_disable(sfb->bus_clk);
1007 static int s3c_fb_resume(struct platform_device *pdev)
1009 struct s3c_fb *sfb = platform_get_drvdata(pdev);
1010 struct s3c_fb_platdata *pd = sfb->pdata;
1011 struct s3c_fb_win *win;
1014 clk_enable(sfb->bus_clk);
1016 /* setup registers */
1017 writel(pd->vidcon1, sfb->regs + VIDCON1);
1019 /* zero all windows before we do anything */
1020 for (win_no = 0; win_no < S3C_FB_MAX_WIN; win_no++)
1021 s3c_fb_clear_win(sfb, win_no);
1023 /* restore framebuffers */
1024 for (win_no = 0; win_no < S3C_FB_MAX_WIN; win_no++) {
1025 win = sfb->windows[win_no];
1029 dev_dbg(&pdev->dev, "resuming window %d\n", win_no);
1030 s3c_fb_set_par(win->fbinfo);
1036 #define s3c_fb_suspend NULL
1037 #define s3c_fb_resume NULL
1040 static struct platform_driver s3c_fb_driver = {
1041 .probe = s3c_fb_probe,
1042 .remove = __devexit_p(s3c_fb_remove),
1043 .suspend = s3c_fb_suspend,
1044 .resume = s3c_fb_resume,
1047 .owner = THIS_MODULE,
1051 static int __init s3c_fb_init(void)
1053 return platform_driver_register(&s3c_fb_driver);
1056 static void __exit s3c_fb_cleanup(void)
1058 platform_driver_unregister(&s3c_fb_driver);
1061 module_init(s3c_fb_init);
1062 module_exit(s3c_fb_cleanup);
1064 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
1065 MODULE_DESCRIPTION("Samsung S3C SoC Framebuffer driver");
1066 MODULE_LICENSE("GPL");
1067 MODULE_ALIAS("platform:s3c-fb");