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/init.h>
20 #include <linux/gfp.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.
215 * @sfb: The hardware state.
216 * @pixclock: The pixel clock wanted, in picoseconds.
218 * Given the specified pixel clock, work out the necessary divider to get
219 * close to the output frequency.
221 static int s3c_fb_calc_pixclk(unsigned char id, struct s3c_fb *sfb, unsigned int pixclk)
223 struct s3c_fb_pd_win *win = sfb->pdata->win[id];
224 unsigned long clk = clk_get_rate(sfb->bus_clk);
227 pixclk *= win->win_mode.refresh;
228 result = clk / pixclk;
230 dev_dbg(sfb->dev, "pixclk=%u, clk=%lu, div=%d (%lu)\n",
231 pixclk, clk, result, clk / result);
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.
241 * Align the given pixel count so that it will start on an 32bit word
244 static int s3c_fb_align_word(unsigned int bpp, unsigned int pix)
251 pix_per_word = (8 * 32) / bpp;
252 return ALIGN(pix, pix_per_word);
256 * s3c_fb_set_par() - framebuffer request to set new framebuffer state.
257 * @info: The framebuffer to change.
259 * Framebuffer layer request to set a new mode for the specified framebuffer
261 static int s3c_fb_set_par(struct fb_info *info)
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;
273 dev_dbg(sfb->dev, "setting framebuffer parameters\n");
275 switch (var->bits_per_pixel) {
280 info->fix.visual = FB_VISUAL_TRUECOLOR;
283 if (s3c_fb_win_has_palette(win_no, 8))
284 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
286 info->fix.visual = FB_VISUAL_TRUECOLOR;
289 info->fix.visual = FB_VISUAL_MONO01;
292 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
296 info->fix.line_length = (var->xres_virtual * var->bits_per_pixel) / 8;
298 /* disable the window whilst we update it */
299 writel(0, regs + WINCON(win_no));
301 /* use window 0 as the basis for the lcd output timings */
304 clkdiv = s3c_fb_calc_pixclk(win_no, sfb, var->pixclock);
306 data = sfb->pdata->vidcon0;
307 data &= ~(VIDCON0_CLKVAL_F_MASK | VIDCON0_CLKDIR);
310 data |= VIDCON0_CLKVAL_F(clkdiv-1) | VIDCON0_CLKDIR;
312 data &= ~VIDCON0_CLKDIR; /* 1:1 clock */
314 /* write the timing data to the panel */
316 data |= VIDCON0_ENVID | VIDCON0_ENVID_F;
317 writel(data, regs + VIDCON0);
319 data = VIDTCON0_VBPD(var->upper_margin - 1) |
320 VIDTCON0_VFPD(var->lower_margin - 1) |
321 VIDTCON0_VSPW(var->vsync_len - 1);
323 writel(data, regs + VIDTCON0);
325 data = VIDTCON1_HBPD(var->left_margin - 1) |
326 VIDTCON1_HFPD(var->right_margin - 1) |
327 VIDTCON1_HSPW(var->hsync_len - 1);
329 writel(data, regs + VIDTCON1);
331 data = VIDTCON2_LINEVAL(var->yres - 1) |
332 VIDTCON2_HOZVAL(var->xres - 1);
333 writel(data, regs + VIDTCON2);
336 /* write the buffer address */
338 writel(info->fix.smem_start, regs + VIDW_BUF_START(win_no));
340 data = info->fix.smem_start + info->fix.line_length * var->yres;
341 writel(data, regs + VIDW_BUF_END(win_no));
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));
348 /* write 'OSD' registers to control position of framebuffer */
350 data = VIDOSDxA_TOPLEFT_X(0) | VIDOSDxA_TOPLEFT_Y(0);
351 writel(data, regs + VIDOSD_A(win_no));
353 data = VIDOSDxB_BOTRIGHT_X(s3c_fb_align_word(var->bits_per_pixel,
355 VIDOSDxB_BOTRIGHT_Y(var->yres - 1);
357 writel(data, regs + VIDOSD_B(win_no));
359 data = var->xres * var->yres;
361 osdc_data = VIDISD14C_ALPHA1_R(0xf) |
362 VIDISD14C_ALPHA1_G(0xf) |
363 VIDISD14C_ALPHA1_B(0xf);
365 if (s3c_fb_has_osd_d(win_no)) {
366 writel(data, regs + VIDOSD_D(win_no));
367 writel(osdc_data, regs + VIDOSD_C(win_no));
369 writel(data, regs + VIDOSD_C(win_no));
371 data = WINCONx_ENWIN;
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. */
377 switch (var->bits_per_pixel) {
379 data |= WINCON0_BPPMODE_1BPP;
380 data |= WINCONx_BITSWP;
381 data |= WINCONx_BURSTLEN_4WORD;
384 data |= WINCON0_BPPMODE_2BPP;
385 data |= WINCONx_BITSWP;
386 data |= WINCONx_BURSTLEN_8WORD;
389 data |= WINCON0_BPPMODE_4BPP;
390 data |= WINCONx_BITSWP;
391 data |= WINCONx_BURSTLEN_8WORD;
394 if (var->transp.length != 0)
395 data |= WINCON1_BPPMODE_8BPP_1232;
397 data |= WINCON0_BPPMODE_8BPP_PALETTE;
398 data |= WINCONx_BURSTLEN_8WORD;
399 data |= WINCONx_BYTSWP;
402 if (var->transp.length != 0)
403 data |= WINCON1_BPPMODE_16BPP_A1555;
405 data |= WINCON0_BPPMODE_16BPP_565;
406 data |= WINCONx_HAWSWP;
407 data |= WINCONx_BURSTLEN_16WORD;
411 if (var->red.length == 6) {
412 if (var->transp.length != 0)
413 data |= WINCON1_BPPMODE_19BPP_A1666;
415 data |= WINCON1_BPPMODE_18BPP_666;
416 } else if (var->transp.length == 1)
417 data |= WINCON1_BPPMODE_25BPP_A1888
419 else if (var->transp.length == 4)
420 data |= WINCON1_BPPMODE_28BPP_A4888
421 | WINCON1_BLD_PIX | WINCON1_ALPHA_SEL;
423 data |= WINCON0_BPPMODE_24BPP_888;
425 data |= WINCONx_BURSTLEN_16WORD;
429 /* It has no color key control register for window0 */
431 u32 keycon0_data = 0, keycon1_data = 0;
433 keycon0_data = ~(WxKEYCON0_KEYBL_EN |
435 WxKEYCON0_DIRCON) | WxKEYCON0_COMPKEY(0);
437 keycon1_data = WxKEYCON1_COLVAL(0xffffff);
439 writel(keycon0_data, regs + WxKEYCONy(win_no-1, 0));
440 writel(keycon1_data, regs + WxKEYCONy(win_no-1, 1));
443 writel(data, regs + WINCON(win_no));
444 writel(0x0, regs + WINxMAP(win_no));
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.
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.
460 * At the moment, since we have no VSYNC interrupt support, we simply set
461 * the palette entry directly.
463 static void s3c_fb_update_palette(struct s3c_fb *sfb,
464 struct s3c_fb_win *win,
468 void __iomem *palreg;
471 palreg = sfb->regs + s3c_fb_pal_reg(win->index, reg);
473 dev_dbg(sfb->dev, "%s: win %d, reg %d (%p): %08x\n",
474 __func__, win->index, reg, palreg, value);
476 win->palette_buffer[reg] = value;
478 palcon = readl(sfb->regs + WPALCON);
479 writel(palcon | WPALCON_PAL_UPDATE, sfb->regs + WPALCON);
481 if (s3c_fb_pal_is16(win->index))
482 writew(value, palreg);
484 writel(value, palreg);
486 writel(palcon, sfb->regs + WPALCON);
489 static inline unsigned int chan_to_field(unsigned int chan,
490 struct fb_bitfield *bf)
493 chan >>= 16 - bf->length;
494 return chan << bf->offset;
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.
506 static int s3c_fb_setcolreg(unsigned regno,
507 unsigned red, unsigned green, unsigned blue,
508 unsigned transp, struct fb_info *info)
510 struct s3c_fb_win *win = info->par;
511 struct s3c_fb *sfb = win->parent;
514 dev_dbg(sfb->dev, "%s: win %d: %d => rgb=%d/%d/%d\n",
515 __func__, win->index, regno, red, green, blue);
517 switch (info->fix.visual) {
518 case FB_VISUAL_TRUECOLOR:
519 /* true-colour, use pseudo-palette */
522 u32 *pal = info->pseudo_palette;
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);
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);
538 s3c_fb_update_palette(sfb, win, regno, val);
544 return 1; /* unknown type */
551 * s3c_fb_enable() - Set the state of the main LCD output
552 * @sfb: The main framebuffer state.
553 * @enable: The state to set.
555 static void s3c_fb_enable(struct s3c_fb *sfb, int enable)
557 u32 vidcon0 = readl(sfb->regs + VIDCON0);
560 vidcon0 |= VIDCON0_ENVID | VIDCON0_ENVID_F;
562 /* see the note in the framebuffer datasheet about
563 * why you cannot take both of these bits down at the
566 if (!(vidcon0 & VIDCON0_ENVID))
569 vidcon0 |= VIDCON0_ENVID;
570 vidcon0 &= ~VIDCON0_ENVID_F;
573 writel(vidcon0, sfb->regs + VIDCON0);
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.
581 * Framebuffer layer request to change the power state.
583 static int s3c_fb_blank(int blank_mode, struct fb_info *info)
585 struct s3c_fb_win *win = info->par;
586 struct s3c_fb *sfb = win->parent;
587 unsigned int index = win->index;
590 dev_dbg(sfb->dev, "blank mode %d\n", blank_mode);
592 wincon = readl(sfb->regs + WINCON(index));
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 */
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));
606 case FB_BLANK_UNBLANK:
607 writel(0x0, sfb->regs + WINxMAP(index));
608 wincon |= WINCONx_ENWIN;
609 sfb->enabled |= (1 << index);
612 case FB_BLANK_VSYNC_SUSPEND:
613 case FB_BLANK_HSYNC_SUSPEND:
618 writel(wincon, sfb->regs + WINCON(index));
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
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.
631 * s3c_fb_enable(sfb, sfb->enabled ? 1 : 0);
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.
638 s3c_fb_enable(sfb, blank_mode != FB_BLANK_POWERDOWN ? 1 : 0);
643 static 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,
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.
659 * Allocate memory for the given framebuffer.
661 static int __devinit s3c_fb_alloc_memory(struct s3c_fb *sfb,
662 struct s3c_fb_win *win)
664 struct s3c_fb_pd_win *windata = win->windata;
665 unsigned int real_size, virt_size, size;
666 struct fb_info *fbi = win->fbinfo;
669 dev_dbg(sfb->dev, "allocating memory for display\n");
671 real_size = windata->win_mode.xres * windata->win_mode.yres;
672 virt_size = windata->virtual_x * windata->virtual_y;
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);
678 size = (real_size > virt_size) ? real_size : virt_size;
679 size *= (windata->max_bpp > 16) ? 32 : windata->max_bpp;
682 fbi->fix.smem_len = size;
683 size = PAGE_ALIGN(size);
685 dev_dbg(sfb->dev, "want %u bytes for window\n", size);
687 fbi->screen_base = dma_alloc_writecombine(sfb->dev, size,
688 &map_dma, GFP_KERNEL);
689 if (!fbi->screen_base)
692 dev_dbg(sfb->dev, "mapped %x to %p\n",
693 (unsigned int)map_dma, fbi->screen_base);
695 memset(fbi->screen_base, 0x0, size);
696 fbi->fix.smem_start = map_dma;
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.
706 * Free the display memory allocated by s3c_fb_alloc_memory().
708 static void s3c_fb_free_memory(struct s3c_fb *sfb, struct s3c_fb_win *win)
710 struct fb_info *fbi = win->fbinfo;
712 dma_free_writecombine(sfb->dev, PAGE_ALIGN(fbi->fix.smem_len),
713 fbi->screen_base, fbi->fix.smem_start);
717 * s3c_fb_release_win() - release resources for a framebuffer window.
718 * @win: The window to cleanup the resources for.
720 * Release the resources that where claimed for the hardware window,
721 * such as the framebuffer instance and any memory claimed for it.
723 static void s3c_fb_release_win(struct s3c_fb *sfb, struct s3c_fb_win *win)
726 unregister_framebuffer(win->fbinfo);
727 fb_dealloc_cmap(&win->fbinfo->cmap);
728 s3c_fb_free_memory(sfb, win);
729 framebuffer_release(win->fbinfo);
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.
738 * Allocate and do the basic initialisation for one of the hardware's graphics
741 static int __devinit s3c_fb_probe_win(struct s3c_fb *sfb, unsigned int win_no,
742 struct s3c_fb_win **res)
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;
752 dev_dbg(sfb->dev, "probing window %d\n", win_no);
754 palette_size = s3c_fb_win_pal_size(win_no);
756 fbinfo = framebuffer_alloc(sizeof(struct s3c_fb_win) +
757 palette_size * sizeof(u32), sfb->dev);
759 dev_err(sfb->dev, "failed to allocate framebuffer\n");
763 windata = sfb->pdata->win[win_no];
764 initmode = &windata->win_mode;
766 WARN_ON(windata->max_bpp == 0);
767 WARN_ON(windata->win_mode.xres == 0);
768 WARN_ON(windata->win_mode.yres == 0);
772 win->fbinfo = fbinfo;
774 win->windata = windata;
776 win->palette_buffer = (u32 *)(win + 1);
778 ret = s3c_fb_alloc_memory(sfb, win);
780 dev_err(sfb->dev, "failed to allocate display memory\n");
784 /* setup the r/b/g positions for the window's palette */
785 s3c_fb_init_palette(win_no, &win->palette);
787 /* setup the initial video mode from the window */
788 fb_videomode_to_var(&fbinfo->var, initmode);
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;
799 /* prepare to actually start the framebuffer */
801 ret = s3c_fb_check_var(&fbinfo->var, fbinfo);
803 dev_err(sfb->dev, "check_var failed on initial video params\n");
807 /* create initial colour map */
809 ret = fb_alloc_cmap(&fbinfo->cmap, s3c_fb_win_pal_size(win_no), 1);
811 fb_set_cmap(&fbinfo->cmap, fbinfo);
813 dev_err(sfb->dev, "failed to allocate fb cmap\n");
815 s3c_fb_set_par(fbinfo);
817 dev_dbg(sfb->dev, "about to register framebuffer\n");
819 /* run the check_var and set_par on our configuration. */
821 ret = register_framebuffer(fbinfo);
823 dev_err(sfb->dev, "failed to register framebuffer\n");
828 dev_info(sfb->dev, "window %d: fb %s\n", win_no, fbinfo->fix.id);
834 * s3c_fb_clear_win() - clear hardware window registers.
835 * @sfb: The base resources for the hardware.
836 * @win: The window to process.
838 * Reset the specific window registers to a known state.
840 static void s3c_fb_clear_win(struct s3c_fb *sfb, int win)
842 void __iomem *regs = sfb->regs;
844 writel(0, regs + WINCON(win));
845 writel(0xffffff, regs + WxKEYCONy(win, 0));
846 writel(0xffffff, regs + WxKEYCONy(win, 1));
848 writel(0, regs + VIDOSD_A(win));
849 writel(0, regs + VIDOSD_B(win));
850 writel(0, regs + VIDOSD_C(win));
853 static int __devinit s3c_fb_probe(struct platform_device *pdev)
855 struct device *dev = &pdev->dev;
856 struct s3c_fb_platdata *pd;
858 struct resource *res;
862 pd = pdev->dev.platform_data;
864 dev_err(dev, "no platform data specified\n");
868 sfb = kzalloc(sizeof(struct s3c_fb), GFP_KERNEL);
870 dev_err(dev, "no memory for framebuffers\n");
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");
883 clk_enable(sfb->bus_clk);
885 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
887 dev_err(dev, "failed to find registers\n");
892 sfb->regs_res = request_mem_region(res->start, resource_size(res),
894 if (!sfb->regs_res) {
895 dev_err(dev, "failed to claim register region\n");
900 sfb->regs = ioremap(res->start, resource_size(res));
902 dev_err(dev, "failed to map registers\n");
907 dev_dbg(dev, "got resources (regs %p), probing windows\n", sfb->regs);
909 /* setup gpio and output polarity controls */
913 writel(pd->vidcon1, sfb->regs + VIDCON1);
915 /* zero all windows before we do anything */
917 for (win = 0; win < S3C_FB_MAX_WIN; win++)
918 s3c_fb_clear_win(sfb, win);
920 /* we have the register setup, start allocating framebuffers */
922 for (win = 0; win < S3C_FB_MAX_WIN; win++) {
926 ret = s3c_fb_probe_win(sfb, win, &sfb->windows[win]);
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]);
935 platform_set_drvdata(pdev, sfb);
943 release_resource(sfb->regs_res);
944 kfree(sfb->regs_res);
947 clk_disable(sfb->bus_clk);
948 clk_put(sfb->bus_clk);
956 * s3c_fb_remove() - Cleanup on module finalisation
957 * @pdev: The platform device we are bound to.
959 * Shutdown and then release all the resources that the driver allocated
962 static int __devexit s3c_fb_remove(struct platform_device *pdev)
964 struct s3c_fb *sfb = platform_get_drvdata(pdev);
967 for (win = 0; win < S3C_FB_MAX_WIN; win++)
968 if (sfb->windows[win])
969 s3c_fb_release_win(sfb, sfb->windows[win]);
973 clk_disable(sfb->bus_clk);
974 clk_put(sfb->bus_clk);
976 release_resource(sfb->regs_res);
977 kfree(sfb->regs_res);
985 static int s3c_fb_suspend(struct platform_device *pdev, pm_message_t state)
987 struct s3c_fb *sfb = platform_get_drvdata(pdev);
988 struct s3c_fb_win *win;
991 for (win_no = S3C_FB_MAX_WIN - 1; win_no >= 0; win_no--) {
992 win = sfb->windows[win_no];
996 /* use the blank function to push into power-down */
997 s3c_fb_blank(FB_BLANK_POWERDOWN, win->fbinfo);
1000 clk_disable(sfb->bus_clk);
1004 static int s3c_fb_resume(struct platform_device *pdev)
1006 struct s3c_fb *sfb = platform_get_drvdata(pdev);
1007 struct s3c_fb_platdata *pd = sfb->pdata;
1008 struct s3c_fb_win *win;
1011 clk_enable(sfb->bus_clk);
1013 /* setup registers */
1014 writel(pd->vidcon1, sfb->regs + VIDCON1);
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);
1020 /* restore framebuffers */
1021 for (win_no = 0; win_no < S3C_FB_MAX_WIN; win_no++) {
1022 win = sfb->windows[win_no];
1026 dev_dbg(&pdev->dev, "resuming window %d\n", win_no);
1027 s3c_fb_set_par(win->fbinfo);
1033 #define s3c_fb_suspend NULL
1034 #define s3c_fb_resume NULL
1037 static 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,
1044 .owner = THIS_MODULE,
1048 static int __init s3c_fb_init(void)
1050 return platform_driver_register(&s3c_fb_driver);
1053 static void __exit s3c_fb_cleanup(void)
1055 platform_driver_unregister(&s3c_fb_driver);
1058 module_init(s3c_fb_init);
1059 module_exit(s3c_fb_cleanup);
1061 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
1062 MODULE_DESCRIPTION("Samsung S3C SoC Framebuffer driver");
1063 MODULE_LICENSE("GPL");
1064 MODULE_ALIAS("platform:s3c-fb");