/* linux/drivers/video/s3c-fb.c * * Copyright 2008 Openmoko Inc. * Copyright 2008-2010 Simtec Electronics * Ben Dooks * http://armlinux.simtec.co.uk/ * * Samsung SoC Framebuffer driver * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software FoundatIon. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* This driver will export a number of framebuffer interfaces depending * on the configuration passed in via the platform data. Each fb instance * maps to a hardware window. Currently there is no support for runtime * setting of the alpha-blending functions that each window has, so only * window 0 is actually useful. * * Window 0 is treated specially, it is used for the basis of the LCD * output timings and as the control for the output power-down state. */ /* note, the previous use of to get platform specific data * has been replaced by using the platform device name to pick the correct * configuration data for the system. */ #ifdef CONFIG_FB_S3C_DEBUG_REGWRITE #undef writel #define writel(v, r) do { \ printk(KERN_DEBUG "%s: %08x => %p\n", __func__, (unsigned int)v, r); \ __raw_writel(v, r); } while(0) #endif /* FB_S3C_DEBUG_REGWRITE */ /* irq_flags bits */ #define S3C_FB_VSYNC_IRQ_EN 0 #define VSYNC_TIMEOUT_MSEC 50 struct s3c_fb; #define VALID_BPP(x) (1 << ((x) - 1)) #define OSD_BASE(win, variant) ((variant).osd + ((win) * (variant).osd_stride)) #define VIDOSD_A(win, variant) (OSD_BASE(win, variant) + 0x00) #define VIDOSD_B(win, variant) (OSD_BASE(win, variant) + 0x04) #define VIDOSD_C(win, variant) (OSD_BASE(win, variant) + 0x08) #define VIDOSD_D(win, variant) (OSD_BASE(win, variant) + 0x0C) /** * struct s3c_fb_variant - fb variant information * @is_2443: Set if S3C2443/S3C2416 style hardware. * @nr_windows: The number of windows. * @vidtcon: The base for the VIDTCONx registers * @wincon: The base for the WINxCON registers. * @winmap: The base for the WINxMAP registers. * @keycon: The abse for the WxKEYCON registers. * @buf_start: Offset of buffer start registers. * @buf_size: Offset of buffer size registers. * @buf_end: Offset of buffer end registers. * @osd: The base for the OSD registers. * @palette: Address of palette memory, or 0 if none. * @has_prtcon: Set if has PRTCON register. * @has_shadowcon: Set if has SHADOWCON register. */ struct s3c_fb_variant { unsigned int is_2443:1; unsigned short nr_windows; unsigned short vidtcon; unsigned short wincon; unsigned short winmap; unsigned short keycon; unsigned short buf_start; unsigned short buf_end; unsigned short buf_size; unsigned short osd; unsigned short osd_stride; unsigned short palette[S3C_FB_MAX_WIN]; unsigned int has_prtcon:1; unsigned int has_shadowcon:1; }; /** * struct s3c_fb_win_variant * @has_osd_c: Set if has OSD C register. * @has_osd_d: Set if has OSD D register. * @has_osd_alpha: Set if can change alpha transparency for a window. * @palette_sz: Size of palette in entries. * @palette_16bpp: Set if palette is 16bits wide. * @osd_size_off: If != 0, supports setting up OSD for a window; the appropriate * register is located at the given offset from OSD_BASE. * @valid_bpp: 1 bit per BPP setting to show valid bits-per-pixel. * * valid_bpp bit x is set if (x+1)BPP is supported. */ struct s3c_fb_win_variant { unsigned int has_osd_c:1; unsigned int has_osd_d:1; unsigned int has_osd_alpha:1; unsigned int palette_16bpp:1; unsigned short osd_size_off; unsigned short palette_sz; u32 valid_bpp; }; /** * struct s3c_fb_driverdata - per-device type driver data for init time. * @variant: The variant information for this driver. * @win: The window information for each window. */ struct s3c_fb_driverdata { struct s3c_fb_variant variant; struct s3c_fb_win_variant *win[S3C_FB_MAX_WIN]; }; /** * struct s3c_fb_palette - palette information * @r: Red bitfield. * @g: Green bitfield. * @b: Blue bitfield. * @a: Alpha bitfield. */ struct s3c_fb_palette { struct fb_bitfield r; struct fb_bitfield g; struct fb_bitfield b; struct fb_bitfield a; }; /** * struct s3c_fb_win - per window private data for each framebuffer. * @windata: The platform data supplied for the window configuration. * @parent: The hardware that this window is part of. * @fbinfo: Pointer pack to the framebuffer info for this window. * @varint: The variant information for this window. * @palette_buffer: Buffer/cache to hold palette entries. * @pseudo_palette: For use in TRUECOLOUR modes for entries 0..15/ * @index: The window number of this window. * @palette: The bitfields for changing r/g/b into a hardware palette entry. */ struct s3c_fb_win { struct s3c_fb_pd_win *windata; struct s3c_fb *parent; struct fb_info *fbinfo; struct s3c_fb_palette palette; struct s3c_fb_win_variant variant; u32 *palette_buffer; u32 pseudo_palette[16]; unsigned int index; }; /** * struct s3c_fb_vsync - vsync information * @wait: a queue for processes waiting for vsync * @count: vsync interrupt count */ struct s3c_fb_vsync { wait_queue_head_t wait; unsigned int count; }; /** * struct s3c_fb - overall hardware state of the hardware * @dev: The device that we bound to, for printing, etc. * @regs_res: The resource we claimed for the IO registers. * @bus_clk: The clk (hclk) feeding our interface and possibly pixclk. * @regs: The mapped hardware registers. * @variant: Variant information for this hardware. * @enabled: A bitmask of enabled hardware windows. * @pdata: The platform configuration data passed with the device. * @windows: The hardware windows that have been claimed. * @irq_no: IRQ line number * @irq_flags: irq flags * @vsync_info: VSYNC-related information (count, queues...) */ struct s3c_fb { struct device *dev; struct resource *regs_res; struct clk *bus_clk; void __iomem *regs; struct s3c_fb_variant variant; unsigned char enabled; struct s3c_fb_platdata *pdata; struct s3c_fb_win *windows[S3C_FB_MAX_WIN]; int irq_no; unsigned long irq_flags; struct s3c_fb_vsync vsync_info; }; /** * s3c_fb_validate_win_bpp - validate the bits-per-pixel for this mode. * @win: The device window. * @bpp: The bit depth. */ static bool s3c_fb_validate_win_bpp(struct s3c_fb_win *win, unsigned int bpp) { return win->variant.valid_bpp & VALID_BPP(bpp); } /** * s3c_fb_check_var() - framebuffer layer request to verify a given mode. * @var: The screen information to verify. * @info: The framebuffer device. * * Framebuffer layer call to verify the given information and allow us to * update various information depending on the hardware capabilities. */ static int s3c_fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) { struct s3c_fb_win *win = info->par; struct s3c_fb_pd_win *windata = win->windata; struct s3c_fb *sfb = win->parent; dev_dbg(sfb->dev, "checking parameters\n"); var->xres_virtual = max((unsigned int)windata->virtual_x, var->xres); var->yres_virtual = max((unsigned int)windata->virtual_y, var->yres); if (!s3c_fb_validate_win_bpp(win, var->bits_per_pixel)) { dev_dbg(sfb->dev, "win %d: unsupported bpp %d\n", win->index, var->bits_per_pixel); return -EINVAL; } /* always ensure these are zero, for drop through cases below */ var->transp.offset = 0; var->transp.length = 0; switch (var->bits_per_pixel) { case 1: case 2: case 4: case 8: if (sfb->variant.palette[win->index] != 0) { /* non palletised, A:1,R:2,G:3,B:2 mode */ var->red.offset = 4; var->green.offset = 2; var->blue.offset = 0; var->red.length = 5; var->green.length = 3; var->blue.length = 2; var->transp.offset = 7; var->transp.length = 1; } else { var->red.offset = 0; var->red.length = var->bits_per_pixel; var->green = var->red; var->blue = var->red; } break; case 19: /* 666 with one bit alpha/transparency */ var->transp.offset = 18; var->transp.length = 1; case 18: var->bits_per_pixel = 32; /* 666 format */ var->red.offset = 12; var->green.offset = 6; var->blue.offset = 0; var->red.length = 6; var->green.length = 6; var->blue.length = 6; break; case 16: /* 16 bpp, 565 format */ var->red.offset = 11; var->green.offset = 5; var->blue.offset = 0; var->red.length = 5; var->green.length = 6; var->blue.length = 5; break; case 28: case 25: var->transp.length = var->bits_per_pixel - 24; var->transp.offset = 24; /* drop through */ case 24: /* our 24bpp is unpacked, so 32bpp */ var->bits_per_pixel = 32; case 32: var->red.offset = 16; var->red.length = 8; var->green.offset = 8; var->green.length = 8; var->blue.offset = 0; var->blue.length = 8; break; default: dev_err(sfb->dev, "invalid bpp\n"); } dev_dbg(sfb->dev, "%s: verified parameters\n", __func__); return 0; } /** * s3c_fb_calc_pixclk() - calculate the divider to create the pixel clock. * @sfb: The hardware state. * @pixclock: The pixel clock wanted, in picoseconds. * * Given the specified pixel clock, work out the necessary divider to get * close to the output frequency. */ static int s3c_fb_calc_pixclk(struct s3c_fb *sfb, unsigned int pixclk) { unsigned long clk = clk_get_rate(sfb->bus_clk); unsigned long long tmp; unsigned int result; tmp = (unsigned long long)clk; tmp *= pixclk; do_div(tmp, 1000000000UL); result = (unsigned int)tmp / 1000; dev_dbg(sfb->dev, "pixclk=%u, clk=%lu, div=%d (%lu)\n", pixclk, clk, result, clk / result); return result; } /** * s3c_fb_align_word() - align pixel count to word boundary * @bpp: The number of bits per pixel * @pix: The value to be aligned. * * Align the given pixel count so that it will start on an 32bit word * boundary. */ static int s3c_fb_align_word(unsigned int bpp, unsigned int pix) { int pix_per_word; if (bpp > 16) return pix; pix_per_word = (8 * 32) / bpp; return ALIGN(pix, pix_per_word); } /** * vidosd_set_size() - set OSD size for a window * * @win: the window to set OSD size for * @size: OSD size register value */ static void vidosd_set_size(struct s3c_fb_win *win, u32 size) { struct s3c_fb *sfb = win->parent; /* OSD can be set up if osd_size_off != 0 for this window */ if (win->variant.osd_size_off) writel(size, sfb->regs + OSD_BASE(win->index, sfb->variant) + win->variant.osd_size_off); } /** * vidosd_set_alpha() - set alpha transparency for a window * * @win: the window to set OSD size for * @alpha: alpha register value */ static void vidosd_set_alpha(struct s3c_fb_win *win, u32 alpha) { struct s3c_fb *sfb = win->parent; if (win->variant.has_osd_alpha) writel(alpha, sfb->regs + VIDOSD_C(win->index, sfb->variant)); } /** * shadow_protect_win() - disable updating values from shadow registers at vsync * * @win: window to protect registers for * @protect: 1 to protect (disable updates) */ static void shadow_protect_win(struct s3c_fb_win *win, bool protect) { struct s3c_fb *sfb = win->parent; u32 reg; if (protect) { if (sfb->variant.has_prtcon) { writel(PRTCON_PROTECT, sfb->regs + PRTCON); } else if (sfb->variant.has_shadowcon) { reg = readl(sfb->regs + SHADOWCON); writel(reg | SHADOWCON_WINx_PROTECT(win->index), sfb->regs + SHADOWCON); } } else { if (sfb->variant.has_prtcon) { writel(0, sfb->regs + PRTCON); } else if (sfb->variant.has_shadowcon) { reg = readl(sfb->regs + SHADOWCON); writel(reg & ~SHADOWCON_WINx_PROTECT(win->index), sfb->regs + SHADOWCON); } } } /** * s3c_fb_set_par() - framebuffer request to set new framebuffer state. * @info: The framebuffer to change. * * Framebuffer layer request to set a new mode for the specified framebuffer */ static int s3c_fb_set_par(struct fb_info *info) { struct fb_var_screeninfo *var = &info->var; struct s3c_fb_win *win = info->par; struct s3c_fb *sfb = win->parent; void __iomem *regs = sfb->regs; void __iomem *buf = regs; int win_no = win->index; u32 alpha = 0; u32 data; u32 pagewidth; int clkdiv; dev_dbg(sfb->dev, "setting framebuffer parameters\n"); shadow_protect_win(win, 1); switch (var->bits_per_pixel) { case 32: case 24: case 16: case 12: info->fix.visual = FB_VISUAL_TRUECOLOR; break; case 8: if (win->variant.palette_sz >= 256) info->fix.visual = FB_VISUAL_PSEUDOCOLOR; else info->fix.visual = FB_VISUAL_TRUECOLOR; break; case 1: info->fix.visual = FB_VISUAL_MONO01; break; default: info->fix.visual = FB_VISUAL_PSEUDOCOLOR; break; } info->fix.line_length = (var->xres_virtual * var->bits_per_pixel) / 8; info->fix.xpanstep = info->var.xres_virtual > info->var.xres ? 1 : 0; info->fix.ypanstep = info->var.yres_virtual > info->var.yres ? 1 : 0; /* disable the window whilst we update it */ writel(0, regs + WINCON(win_no)); /* use platform specified window as the basis for the lcd timings */ if (win_no == sfb->pdata->default_win) { clkdiv = s3c_fb_calc_pixclk(sfb, var->pixclock); data = sfb->pdata->vidcon0; data &= ~(VIDCON0_CLKVAL_F_MASK | VIDCON0_CLKDIR); if (clkdiv > 1) data |= VIDCON0_CLKVAL_F(clkdiv-1) | VIDCON0_CLKDIR; else data &= ~VIDCON0_CLKDIR; /* 1:1 clock */ /* write the timing data to the panel */ if (sfb->variant.is_2443) data |= (1 << 5); data |= VIDCON0_ENVID | VIDCON0_ENVID_F; writel(data, regs + VIDCON0); data = VIDTCON0_VBPD(var->upper_margin - 1) | VIDTCON0_VFPD(var->lower_margin - 1) | VIDTCON0_VSPW(var->vsync_len - 1); writel(data, regs + sfb->variant.vidtcon); data = VIDTCON1_HBPD(var->left_margin - 1) | VIDTCON1_HFPD(var->right_margin - 1) | VIDTCON1_HSPW(var->hsync_len - 1); /* VIDTCON1 */ writel(data, regs + sfb->variant.vidtcon + 4); data = VIDTCON2_LINEVAL(var->yres - 1) | VIDTCON2_HOZVAL(var->xres - 1); writel(data, regs +sfb->variant.vidtcon + 8 ); } /* write the buffer address */ /* start and end registers stride is 8 */ buf = regs + win_no * 8; writel(info->fix.smem_start, buf + sfb->variant.buf_start); data = info->fix.smem_start + info->fix.line_length * var->yres; writel(data, buf + sfb->variant.buf_end); pagewidth = (var->xres * var->bits_per_pixel) >> 3; data = VIDW_BUF_SIZE_OFFSET(info->fix.line_length - pagewidth) | VIDW_BUF_SIZE_PAGEWIDTH(pagewidth); writel(data, regs + sfb->variant.buf_size + (win_no * 4)); /* write 'OSD' registers to control position of framebuffer */ data = VIDOSDxA_TOPLEFT_X(0) | VIDOSDxA_TOPLEFT_Y(0); writel(data, regs + VIDOSD_A(win_no, sfb->variant)); data = VIDOSDxB_BOTRIGHT_X(s3c_fb_align_word(var->bits_per_pixel, var->xres - 1)) | VIDOSDxB_BOTRIGHT_Y(var->yres - 1); writel(data, regs + VIDOSD_B(win_no, sfb->variant)); data = var->xres * var->yres; alpha = VIDISD14C_ALPHA1_R(0xf) | VIDISD14C_ALPHA1_G(0xf) | VIDISD14C_ALPHA1_B(0xf); vidosd_set_alpha(win, alpha); vidosd_set_size(win, data); data = WINCONx_ENWIN; /* note, since we have to round up the bits-per-pixel, we end up * relying on the bitfield information for r/g/b/a to work out * exactly which mode of operation is intended. */ switch (var->bits_per_pixel) { case 1: data |= WINCON0_BPPMODE_1BPP; data |= WINCONx_BITSWP; data |= WINCONx_BURSTLEN_4WORD; break; case 2: data |= WINCON0_BPPMODE_2BPP; data |= WINCONx_BITSWP; data |= WINCONx_BURSTLEN_8WORD; break; case 4: data |= WINCON0_BPPMODE_4BPP; data |= WINCONx_BITSWP; data |= WINCONx_BURSTLEN_8WORD; break; case 8: if (var->transp.length != 0) data |= WINCON1_BPPMODE_8BPP_1232; else data |= WINCON0_BPPMODE_8BPP_PALETTE; data |= WINCONx_BURSTLEN_8WORD; data |= WINCONx_BYTSWP; break; case 16: if (var->transp.length != 0) data |= WINCON1_BPPMODE_16BPP_A1555; else data |= WINCON0_BPPMODE_16BPP_565; data |= WINCONx_HAWSWP; data |= WINCONx_BURSTLEN_16WORD; break; case 24: case 32: if (var->red.length == 6) { if (var->transp.length != 0) data |= WINCON1_BPPMODE_19BPP_A1666; else data |= WINCON1_BPPMODE_18BPP_666; } else if (var->transp.length == 1) data |= WINCON1_BPPMODE_25BPP_A1888 | WINCON1_BLD_PIX; else if (var->transp.length == 4) data |= WINCON1_BPPMODE_28BPP_A4888 | WINCON1_BLD_PIX | WINCON1_ALPHA_SEL; else data |= WINCON0_BPPMODE_24BPP_888; data |= WINCONx_WSWP; data |= WINCONx_BURSTLEN_16WORD; break; } /* Enable the colour keying for the window below this one */ if (win_no > 0) { u32 keycon0_data = 0, keycon1_data = 0; void __iomem *keycon = regs + sfb->variant.keycon; keycon0_data = ~(WxKEYCON0_KEYBL_EN | WxKEYCON0_KEYEN_F | WxKEYCON0_DIRCON) | WxKEYCON0_COMPKEY(0); keycon1_data = WxKEYCON1_COLVAL(0xffffff); keycon += (win_no - 1) * 8; writel(keycon0_data, keycon + WKEYCON0); writel(keycon1_data, keycon + WKEYCON1); } writel(data, regs + sfb->variant.wincon + (win_no * 4)); writel(0x0, regs + sfb->variant.winmap + (win_no * 4)); shadow_protect_win(win, 0); return 0; } /** * s3c_fb_update_palette() - set or schedule a palette update. * @sfb: The hardware information. * @win: The window being updated. * @reg: The palette index being changed. * @value: The computed palette value. * * Change the value of a palette register, either by directly writing to * the palette (this requires the palette RAM to be disconnected from the * hardware whilst this is in progress) or schedule the update for later. * * At the moment, since we have no VSYNC interrupt support, we simply set * the palette entry directly. */ static void s3c_fb_update_palette(struct s3c_fb *sfb, struct s3c_fb_win *win, unsigned int reg, u32 value) { void __iomem *palreg; u32 palcon; palreg = sfb->regs + sfb->variant.palette[win->index]; dev_dbg(sfb->dev, "%s: win %d, reg %d (%p): %08x\n", __func__, win->index, reg, palreg, value); win->palette_buffer[reg] = value; palcon = readl(sfb->regs + WPALCON); writel(palcon | WPALCON_PAL_UPDATE, sfb->regs + WPALCON); if (win->variant.palette_16bpp) writew(value, palreg + (reg * 2)); else writel(value, palreg + (reg * 4)); writel(palcon, sfb->regs + WPALCON); } static inline unsigned int chan_to_field(unsigned int chan, struct fb_bitfield *bf) { chan &= 0xffff; chan >>= 16 - bf->length; return chan << bf->offset; } /** * s3c_fb_setcolreg() - framebuffer layer request to change palette. * @regno: The palette index to change. * @red: The red field for the palette data. * @green: The green field for the palette data. * @blue: The blue field for the palette data. * @trans: The transparency (alpha) field for the palette data. * @info: The framebuffer being changed. */ static int s3c_fb_setcolreg(unsigned regno, unsigned red, unsigned green, unsigned blue, unsigned transp, struct fb_info *info) { struct s3c_fb_win *win = info->par; struct s3c_fb *sfb = win->parent; unsigned int val; dev_dbg(sfb->dev, "%s: win %d: %d => rgb=%d/%d/%d\n", __func__, win->index, regno, red, green, blue); switch (info->fix.visual) { case FB_VISUAL_TRUECOLOR: /* true-colour, use pseudo-palette */ if (regno < 16) { u32 *pal = info->pseudo_palette; val = chan_to_field(red, &info->var.red); val |= chan_to_field(green, &info->var.green); val |= chan_to_field(blue, &info->var.blue); pal[regno] = val; } break; case FB_VISUAL_PSEUDOCOLOR: if (regno < win->variant.palette_sz) { val = chan_to_field(red, &win->palette.r); val |= chan_to_field(green, &win->palette.g); val |= chan_to_field(blue, &win->palette.b); s3c_fb_update_palette(sfb, win, regno, val); } break; default: return 1; /* unknown type */ } return 0; } /** * s3c_fb_enable() - Set the state of the main LCD output * @sfb: The main framebuffer state. * @enable: The state to set. */ static void s3c_fb_enable(struct s3c_fb *sfb, int enable) { u32 vidcon0 = readl(sfb->regs + VIDCON0); if (enable) vidcon0 |= VIDCON0_ENVID | VIDCON0_ENVID_F; else { /* see the note in the framebuffer datasheet about * why you cannot take both of these bits down at the * same time. */ if (!(vidcon0 & VIDCON0_ENVID)) return; vidcon0 |= VIDCON0_ENVID; vidcon0 &= ~VIDCON0_ENVID_F; } writel(vidcon0, sfb->regs + VIDCON0); } /** * s3c_fb_blank() - blank or unblank the given window * @blank_mode: The blank state from FB_BLANK_* * @info: The framebuffer to blank. * * Framebuffer layer request to change the power state. */ static int s3c_fb_blank(int blank_mode, struct fb_info *info) { struct s3c_fb_win *win = info->par; struct s3c_fb *sfb = win->parent; unsigned int index = win->index; u32 wincon; dev_dbg(sfb->dev, "blank mode %d\n", blank_mode); wincon = readl(sfb->regs + sfb->variant.wincon + (index * 4)); switch (blank_mode) { case FB_BLANK_POWERDOWN: wincon &= ~WINCONx_ENWIN; sfb->enabled &= ~(1 << index); /* fall through to FB_BLANK_NORMAL */ case FB_BLANK_NORMAL: /* disable the DMA and display 0x0 (black) */ writel(WINxMAP_MAP | WINxMAP_MAP_COLOUR(0x0), sfb->regs + sfb->variant.winmap + (index * 4)); break; case FB_BLANK_UNBLANK: writel(0x0, sfb->regs + sfb->variant.winmap + (index * 4)); wincon |= WINCONx_ENWIN; sfb->enabled |= (1 << index); break; case FB_BLANK_VSYNC_SUSPEND: case FB_BLANK_HSYNC_SUSPEND: default: return 1; } writel(wincon, sfb->regs + sfb->variant.wincon + (index * 4)); /* Check the enabled state to see if we need to be running the * main LCD interface, as if there are no active windows then * it is highly likely that we also do not need to output * anything. */ /* We could do something like the following code, but the current * system of using framebuffer events means that we cannot make * the distinction between just window 0 being inactive and all * the windows being down. * * s3c_fb_enable(sfb, sfb->enabled ? 1 : 0); */ /* we're stuck with this until we can do something about overriding * the power control using the blanking event for a single fb. */ if (index == sfb->pdata->default_win) s3c_fb_enable(sfb, blank_mode != FB_BLANK_POWERDOWN ? 1 : 0); return 0; } /** * s3c_fb_pan_display() - Pan the display. * * Note that the offsets can be written to the device at any time, as their * values are latched at each vsync automatically. This also means that only * the last call to this function will have any effect on next vsync, but * there is no need to sleep waiting for it to prevent tearing. * * @var: The screen information to verify. * @info: The framebuffer device. */ static int s3c_fb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info) { struct s3c_fb_win *win = info->par; struct s3c_fb *sfb = win->parent; void __iomem *buf = sfb->regs + win->index * 8; unsigned int start_boff, end_boff; /* Offset in bytes to the start of the displayed area */ start_boff = var->yoffset * info->fix.line_length; /* X offset depends on the current bpp */ if (info->var.bits_per_pixel >= 8) { start_boff += var->xoffset * (info->var.bits_per_pixel >> 3); } else { switch (info->var.bits_per_pixel) { case 4: start_boff += var->xoffset >> 1; break; case 2: start_boff += var->xoffset >> 2; break; case 1: start_boff += var->xoffset >> 3; break; default: dev_err(sfb->dev, "invalid bpp\n"); return -EINVAL; } } /* Offset in bytes to the end of the displayed area */ end_boff = start_boff + var->yres * info->fix.line_length; /* Temporarily turn off per-vsync update from shadow registers until * both start and end addresses are updated to prevent corruption */ shadow_protect_win(win, 1); writel(info->fix.smem_start + start_boff, buf + sfb->variant.buf_start); writel(info->fix.smem_start + end_boff, buf + sfb->variant.buf_end); shadow_protect_win(win, 0); return 0; } /** * s3c_fb_enable_irq() - enable framebuffer interrupts * @sfb: main hardware state */ static void s3c_fb_enable_irq(struct s3c_fb *sfb) { void __iomem *regs = sfb->regs; u32 irq_ctrl_reg; if (!test_and_set_bit(S3C_FB_VSYNC_IRQ_EN, &sfb->irq_flags)) { /* IRQ disabled, enable it */ irq_ctrl_reg = readl(regs + VIDINTCON0); irq_ctrl_reg |= VIDINTCON0_INT_ENABLE; irq_ctrl_reg |= VIDINTCON0_INT_FRAME; irq_ctrl_reg &= ~VIDINTCON0_FRAMESEL0_MASK; irq_ctrl_reg |= VIDINTCON0_FRAMESEL0_VSYNC; irq_ctrl_reg &= ~VIDINTCON0_FRAMESEL1_MASK; irq_ctrl_reg |= VIDINTCON0_FRAMESEL1_NONE; writel(irq_ctrl_reg, regs + VIDINTCON0); } } /** * s3c_fb_disable_irq() - disable framebuffer interrupts * @sfb: main hardware state */ static void s3c_fb_disable_irq(struct s3c_fb *sfb) { void __iomem *regs = sfb->regs; u32 irq_ctrl_reg; if (test_and_clear_bit(S3C_FB_VSYNC_IRQ_EN, &sfb->irq_flags)) { /* IRQ enabled, disable it */ irq_ctrl_reg = readl(regs + VIDINTCON0); irq_ctrl_reg &= ~VIDINTCON0_INT_FRAME; irq_ctrl_reg &= ~VIDINTCON0_INT_ENABLE; writel(irq_ctrl_reg, regs + VIDINTCON0); } } static irqreturn_t s3c_fb_irq(int irq, void *dev_id) { struct s3c_fb *sfb = dev_id; void __iomem *regs = sfb->regs; u32 irq_sts_reg; irq_sts_reg = readl(regs + VIDINTCON1); if (irq_sts_reg & VIDINTCON1_INT_FRAME) { /* VSYNC interrupt, accept it */ writel(VIDINTCON1_INT_FRAME, regs + VIDINTCON1); sfb->vsync_info.count++; wake_up_interruptible(&sfb->vsync_info.wait); } /* We only support waiting for VSYNC for now, so it's safe * to always disable irqs here. */ s3c_fb_disable_irq(sfb); return IRQ_HANDLED; } /** * s3c_fb_wait_for_vsync() - sleep until next VSYNC interrupt or timeout * @sfb: main hardware state * @crtc: head index. */ static int s3c_fb_wait_for_vsync(struct s3c_fb *sfb, u32 crtc) { unsigned long count; int ret; if (crtc != 0) return -ENODEV; count = sfb->vsync_info.count; s3c_fb_enable_irq(sfb); ret = wait_event_interruptible_timeout(sfb->vsync_info.wait, count != sfb->vsync_info.count, msecs_to_jiffies(VSYNC_TIMEOUT_MSEC)); if (ret == 0) return -ETIMEDOUT; return 0; } static int s3c_fb_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg) { struct s3c_fb_win *win = info->par; struct s3c_fb *sfb = win->parent; int ret; u32 crtc; switch (cmd) { case FBIO_WAITFORVSYNC: if (get_user(crtc, (u32 __user *)arg)) { ret = -EFAULT; break; } ret = s3c_fb_wait_for_vsync(sfb, crtc); break; default: ret = -ENOTTY; } return ret; } static struct fb_ops s3c_fb_ops = { .owner = THIS_MODULE, .fb_check_var = s3c_fb_check_var, .fb_set_par = s3c_fb_set_par, .fb_blank = s3c_fb_blank, .fb_setcolreg = s3c_fb_setcolreg, .fb_fillrect = cfb_fillrect, .fb_copyarea = cfb_copyarea, .fb_imageblit = cfb_imageblit, .fb_pan_display = s3c_fb_pan_display, .fb_ioctl = s3c_fb_ioctl, }; /** * s3c_fb_alloc_memory() - allocate display memory for framebuffer window * @sfb: The base resources for the hardware. * @win: The window to initialise memory for. * * Allocate memory for the given framebuffer. */ static int __devinit s3c_fb_alloc_memory(struct s3c_fb *sfb, struct s3c_fb_win *win) { struct s3c_fb_pd_win *windata = win->windata; unsigned int real_size, virt_size, size; struct fb_info *fbi = win->fbinfo; dma_addr_t map_dma; dev_dbg(sfb->dev, "allocating memory for display\n"); real_size = windata->win_mode.xres * windata->win_mode.yres; virt_size = windata->virtual_x * windata->virtual_y; dev_dbg(sfb->dev, "real_size=%u (%u.%u), virt_size=%u (%u.%u)\n", real_size, windata->win_mode.xres, windata->win_mode.yres, virt_size, windata->virtual_x, windata->virtual_y); size = (real_size > virt_size) ? real_size : virt_size; size *= (windata->max_bpp > 16) ? 32 : windata->max_bpp; size /= 8; fbi->fix.smem_len = size; size = PAGE_ALIGN(size); dev_dbg(sfb->dev, "want %u bytes for window\n", size); fbi->screen_base = dma_alloc_writecombine(sfb->dev, size, &map_dma, GFP_KERNEL); if (!fbi->screen_base) return -ENOMEM; dev_dbg(sfb->dev, "mapped %x to %p\n", (unsigned int)map_dma, fbi->screen_base); memset(fbi->screen_base, 0x0, size); fbi->fix.smem_start = map_dma; return 0; } /** * s3c_fb_free_memory() - free the display memory for the given window * @sfb: The base resources for the hardware. * @win: The window to free the display memory for. * * Free the display memory allocated by s3c_fb_alloc_memory(). */ static void s3c_fb_free_memory(struct s3c_fb *sfb, struct s3c_fb_win *win) { struct fb_info *fbi = win->fbinfo; if (fbi->screen_base) dma_free_writecombine(sfb->dev, PAGE_ALIGN(fbi->fix.smem_len), fbi->screen_base, fbi->fix.smem_start); } /** * s3c_fb_release_win() - release resources for a framebuffer window. * @win: The window to cleanup the resources for. * * Release the resources that where claimed for the hardware window, * such as the framebuffer instance and any memory claimed for it. */ static void s3c_fb_release_win(struct s3c_fb *sfb, struct s3c_fb_win *win) { if (win->fbinfo) { unregister_framebuffer(win->fbinfo); if (win->fbinfo->cmap.len) fb_dealloc_cmap(&win->fbinfo->cmap); s3c_fb_free_memory(sfb, win); framebuffer_release(win->fbinfo); } } /** * s3c_fb_probe_win() - register an hardware window * @sfb: The base resources for the hardware * @variant: The variant information for this window. * @res: Pointer to where to place the resultant window. * * Allocate and do the basic initialisation for one of the hardware's graphics * windows. */ static int __devinit s3c_fb_probe_win(struct s3c_fb *sfb, unsigned int win_no, struct s3c_fb_win_variant *variant, struct s3c_fb_win **res) { struct fb_var_screeninfo *var; struct fb_videomode *initmode; struct s3c_fb_pd_win *windata; struct s3c_fb_win *win; struct fb_info *fbinfo; int palette_size; int ret; dev_dbg(sfb->dev, "probing window %d, variant %p\n", win_no, variant); init_waitqueue_head(&sfb->vsync_info.wait); palette_size = variant->palette_sz * 4; fbinfo = framebuffer_alloc(sizeof(struct s3c_fb_win) + palette_size * sizeof(u32), sfb->dev); if (!fbinfo) { dev_err(sfb->dev, "failed to allocate framebuffer\n"); return -ENOENT; } windata = sfb->pdata->win[win_no]; initmode = &windata->win_mode; WARN_ON(windata->max_bpp == 0); WARN_ON(windata->win_mode.xres == 0); WARN_ON(windata->win_mode.yres == 0); win = fbinfo->par; *res = win; var = &fbinfo->var; win->variant = *variant; win->fbinfo = fbinfo; win->parent = sfb; win->windata = windata; win->index = win_no; win->palette_buffer = (u32 *)(win + 1); ret = s3c_fb_alloc_memory(sfb, win); if (ret) { dev_err(sfb->dev, "failed to allocate display memory\n"); return ret; } /* setup the r/b/g positions for the window's palette */ if (win->variant.palette_16bpp) { /* Set RGB 5:6:5 as default */ win->palette.r.offset = 11; win->palette.r.length = 5; win->palette.g.offset = 5; win->palette.g.length = 6; win->palette.b.offset = 0; win->palette.b.length = 5; } else { /* Set 8bpp or 8bpp and 1bit alpha */ win->palette.r.offset = 16; win->palette.r.length = 8; win->palette.g.offset = 8; win->palette.g.length = 8; win->palette.b.offset = 0; win->palette.b.length = 8; } /* setup the initial video mode from the window */ fb_videomode_to_var(&fbinfo->var, initmode); fbinfo->fix.type = FB_TYPE_PACKED_PIXELS; fbinfo->fix.accel = FB_ACCEL_NONE; fbinfo->var.activate = FB_ACTIVATE_NOW; fbinfo->var.vmode = FB_VMODE_NONINTERLACED; fbinfo->var.bits_per_pixel = windata->default_bpp; fbinfo->fbops = &s3c_fb_ops; fbinfo->flags = FBINFO_FLAG_DEFAULT; fbinfo->pseudo_palette = &win->pseudo_palette; /* prepare to actually start the framebuffer */ ret = s3c_fb_check_var(&fbinfo->var, fbinfo); if (ret < 0) { dev_err(sfb->dev, "check_var failed on initial video params\n"); return ret; } /* create initial colour map */ ret = fb_alloc_cmap(&fbinfo->cmap, win->variant.palette_sz, 1); if (ret == 0) fb_set_cmap(&fbinfo->cmap, fbinfo); else dev_err(sfb->dev, "failed to allocate fb cmap\n"); s3c_fb_set_par(fbinfo); dev_dbg(sfb->dev, "about to register framebuffer\n"); /* run the check_var and set_par on our configuration. */ ret = register_framebuffer(fbinfo); if (ret < 0) { dev_err(sfb->dev, "failed to register framebuffer\n"); return ret; } dev_info(sfb->dev, "window %d: fb %s\n", win_no, fbinfo->fix.id); return 0; } /** * s3c_fb_clear_win() - clear hardware window registers. * @sfb: The base resources for the hardware. * @win: The window to process. * * Reset the specific window registers to a known state. */ static void s3c_fb_clear_win(struct s3c_fb *sfb, int win) { void __iomem *regs = sfb->regs; u32 reg; writel(0, regs + sfb->variant.wincon + (win * 4)); writel(0, regs + VIDOSD_A(win, sfb->variant)); writel(0, regs + VIDOSD_B(win, sfb->variant)); writel(0, regs + VIDOSD_C(win, sfb->variant)); reg = readl(regs + SHADOWCON); writel(reg & ~SHADOWCON_WINx_PROTECT(win), regs + SHADOWCON); } static int __devinit s3c_fb_probe(struct platform_device *pdev) { struct s3c_fb_driverdata *fbdrv; struct device *dev = &pdev->dev; struct s3c_fb_platdata *pd; struct s3c_fb *sfb; struct resource *res; int win; int ret = 0; fbdrv = (struct s3c_fb_driverdata *)platform_get_device_id(pdev)->driver_data; if (fbdrv->variant.nr_windows > S3C_FB_MAX_WIN) { dev_err(dev, "too many windows, cannot attach\n"); return -EINVAL; } pd = pdev->dev.platform_data; if (!pd) { dev_err(dev, "no platform data specified\n"); return -EINVAL; } sfb = kzalloc(sizeof(struct s3c_fb), GFP_KERNEL); if (!sfb) { dev_err(dev, "no memory for framebuffers\n"); return -ENOMEM; } dev_dbg(dev, "allocate new framebuffer %p\n", sfb); sfb->dev = dev; sfb->pdata = pd; sfb->variant = fbdrv->variant; sfb->bus_clk = clk_get(dev, "lcd"); if (IS_ERR(sfb->bus_clk)) { dev_err(dev, "failed to get bus clock\n"); goto err_sfb; } clk_enable(sfb->bus_clk); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) { dev_err(dev, "failed to find registers\n"); ret = -ENOENT; goto err_clk; } sfb->regs_res = request_mem_region(res->start, resource_size(res), dev_name(dev)); if (!sfb->regs_res) { dev_err(dev, "failed to claim register region\n"); ret = -ENOENT; goto err_clk; } sfb->regs = ioremap(res->start, resource_size(res)); if (!sfb->regs) { dev_err(dev, "failed to map registers\n"); ret = -ENXIO; goto err_req_region; } res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); if (!res) { dev_err(dev, "failed to acquire irq resource\n"); ret = -ENOENT; goto err_ioremap; } sfb->irq_no = res->start; ret = request_irq(sfb->irq_no, s3c_fb_irq, 0, "s3c_fb", sfb); if (ret) { dev_err(dev, "irq request failed\n"); goto err_ioremap; } dev_dbg(dev, "got resources (regs %p), probing windows\n", sfb->regs); /* setup gpio and output polarity controls */ pd->setup_gpio(); writel(pd->vidcon1, sfb->regs + VIDCON1); /* zero all windows before we do anything */ for (win = 0; win < fbdrv->variant.nr_windows; win++) s3c_fb_clear_win(sfb, win); /* initialise colour key controls */ for (win = 0; win < (fbdrv->variant.nr_windows - 1); win++) { void __iomem *regs = sfb->regs + sfb->variant.keycon; regs += (win * 8); writel(0xffffff, regs + WKEYCON0); writel(0xffffff, regs + WKEYCON1); } /* we have the register setup, start allocating framebuffers */ for (win = 0; win < fbdrv->variant.nr_windows; win++) { if (!pd->win[win]) continue; ret = s3c_fb_probe_win(sfb, win, fbdrv->win[win], &sfb->windows[win]); if (ret < 0) { dev_err(dev, "failed to create window %d\n", win); for (; win >= 0; win--) s3c_fb_release_win(sfb, sfb->windows[win]); goto err_irq; } } platform_set_drvdata(pdev, sfb); return 0; err_irq: free_irq(sfb->irq_no, sfb); err_ioremap: iounmap(sfb->regs); err_req_region: release_resource(sfb->regs_res); kfree(sfb->regs_res); err_clk: clk_disable(sfb->bus_clk); clk_put(sfb->bus_clk); err_sfb: kfree(sfb); return ret; } /** * s3c_fb_remove() - Cleanup on module finalisation * @pdev: The platform device we are bound to. * * Shutdown and then release all the resources that the driver allocated * on initialisation. */ static int __devexit s3c_fb_remove(struct platform_device *pdev) { struct s3c_fb *sfb = platform_get_drvdata(pdev); int win; for (win = 0; win < S3C_FB_MAX_WIN; win++) if (sfb->windows[win]) s3c_fb_release_win(sfb, sfb->windows[win]); free_irq(sfb->irq_no, sfb); iounmap(sfb->regs); clk_disable(sfb->bus_clk); clk_put(sfb->bus_clk); release_resource(sfb->regs_res); kfree(sfb->regs_res); kfree(sfb); return 0; } #ifdef CONFIG_PM static int s3c_fb_suspend(struct platform_device *pdev, pm_message_t state) { struct s3c_fb *sfb = platform_get_drvdata(pdev); struct s3c_fb_win *win; int win_no; for (win_no = S3C_FB_MAX_WIN - 1; win_no >= 0; win_no--) { win = sfb->windows[win_no]; if (!win) continue; /* use the blank function to push into power-down */ s3c_fb_blank(FB_BLANK_POWERDOWN, win->fbinfo); } clk_disable(sfb->bus_clk); return 0; } static int s3c_fb_resume(struct platform_device *pdev) { struct s3c_fb *sfb = platform_get_drvdata(pdev); struct s3c_fb_platdata *pd = sfb->pdata; struct s3c_fb_win *win; int win_no; clk_enable(sfb->bus_clk); /* setup registers */ writel(pd->vidcon1, sfb->regs + VIDCON1); /* zero all windows before we do anything */ for (win_no = 0; win_no < sfb->variant.nr_windows; win_no++) s3c_fb_clear_win(sfb, win_no); for (win_no = 0; win_no < sfb->variant.nr_windows - 1; win_no++) { void __iomem *regs = sfb->regs + sfb->variant.keycon; regs += (win_no * 8); writel(0xffffff, regs + WKEYCON0); writel(0xffffff, regs + WKEYCON1); } /* restore framebuffers */ for (win_no = 0; win_no < S3C_FB_MAX_WIN; win_no++) { win = sfb->windows[win_no]; if (!win) continue; dev_dbg(&pdev->dev, "resuming window %d\n", win_no); s3c_fb_set_par(win->fbinfo); } return 0; } #else #define s3c_fb_suspend NULL #define s3c_fb_resume NULL #endif #define VALID_BPP124 (VALID_BPP(1) | VALID_BPP(2) | VALID_BPP(4)) #define VALID_BPP1248 (VALID_BPP124 | VALID_BPP(8)) static struct s3c_fb_win_variant s3c_fb_data_64xx_wins[] __devinitdata = { [0] = { .has_osd_c = 1, .osd_size_off = 0x8, .palette_sz = 256, .valid_bpp = VALID_BPP1248 | VALID_BPP(16) | VALID_BPP(24), }, [1] = { .has_osd_c = 1, .has_osd_d = 1, .osd_size_off = 0x12, .has_osd_alpha = 1, .palette_sz = 256, .valid_bpp = (VALID_BPP1248 | VALID_BPP(16) | VALID_BPP(18) | VALID_BPP(19) | VALID_BPP(24) | VALID_BPP(25)), }, [2] = { .has_osd_c = 1, .has_osd_d = 1, .osd_size_off = 0x12, .has_osd_alpha = 1, .palette_sz = 16, .palette_16bpp = 1, .valid_bpp = (VALID_BPP1248 | VALID_BPP(16) | VALID_BPP(18) | VALID_BPP(19) | VALID_BPP(24) | VALID_BPP(25)), }, [3] = { .has_osd_c = 1, .has_osd_alpha = 1, .palette_sz = 16, .palette_16bpp = 1, .valid_bpp = (VALID_BPP124 | VALID_BPP(16) | VALID_BPP(18) | VALID_BPP(19) | VALID_BPP(24) | VALID_BPP(25)), }, [4] = { .has_osd_c = 1, .has_osd_alpha = 1, .palette_sz = 4, .palette_16bpp = 1, .valid_bpp = (VALID_BPP(1) | VALID_BPP(2) | VALID_BPP(16) | VALID_BPP(18) | VALID_BPP(24) | VALID_BPP(25)), }, }; static struct s3c_fb_driverdata s3c_fb_data_64xx __devinitdata = { .variant = { .nr_windows = 5, .vidtcon = VIDTCON0, .wincon = WINCON(0), .winmap = WINxMAP(0), .keycon = WKEYCON, .osd = VIDOSD_BASE, .osd_stride = 16, .buf_start = VIDW_BUF_START(0), .buf_size = VIDW_BUF_SIZE(0), .buf_end = VIDW_BUF_END(0), .palette = { [0] = 0x400, [1] = 0x800, [2] = 0x300, [3] = 0x320, [4] = 0x340, }, .has_prtcon = 1, }, .win[0] = &s3c_fb_data_64xx_wins[0], .win[1] = &s3c_fb_data_64xx_wins[1], .win[2] = &s3c_fb_data_64xx_wins[2], .win[3] = &s3c_fb_data_64xx_wins[3], .win[4] = &s3c_fb_data_64xx_wins[4], }; static struct s3c_fb_driverdata s3c_fb_data_s5pc100 __devinitdata = { .variant = { .nr_windows = 5, .vidtcon = VIDTCON0, .wincon = WINCON(0), .winmap = WINxMAP(0), .keycon = WKEYCON, .osd = VIDOSD_BASE, .osd_stride = 16, .buf_start = VIDW_BUF_START(0), .buf_size = VIDW_BUF_SIZE(0), .buf_end = VIDW_BUF_END(0), .palette = { [0] = 0x2400, [1] = 0x2800, [2] = 0x2c00, [3] = 0x3000, [4] = 0x3400, }, .has_prtcon = 1, }, .win[0] = &s3c_fb_data_64xx_wins[0], .win[1] = &s3c_fb_data_64xx_wins[1], .win[2] = &s3c_fb_data_64xx_wins[2], .win[3] = &s3c_fb_data_64xx_wins[3], .win[4] = &s3c_fb_data_64xx_wins[4], }; static struct s3c_fb_driverdata s3c_fb_data_s5pv210 __devinitdata = { .variant = { .nr_windows = 5, .vidtcon = VIDTCON0, .wincon = WINCON(0), .winmap = WINxMAP(0), .keycon = WKEYCON, .osd = VIDOSD_BASE, .osd_stride = 16, .buf_start = VIDW_BUF_START(0), .buf_size = VIDW_BUF_SIZE(0), .buf_end = VIDW_BUF_END(0), .palette = { [0] = 0x2400, [1] = 0x2800, [2] = 0x2c00, [3] = 0x3000, [4] = 0x3400, }, .has_shadowcon = 1, }, .win[0] = &s3c_fb_data_64xx_wins[0], .win[1] = &s3c_fb_data_64xx_wins[1], .win[2] = &s3c_fb_data_64xx_wins[2], .win[3] = &s3c_fb_data_64xx_wins[3], .win[4] = &s3c_fb_data_64xx_wins[4], }; /* S3C2443/S3C2416 style hardware */ static struct s3c_fb_driverdata s3c_fb_data_s3c2443 __devinitdata = { .variant = { .nr_windows = 2, .is_2443 = 1, .vidtcon = 0x08, .wincon = 0x14, .winmap = 0xd0, .keycon = 0xb0, .osd = 0x28, .osd_stride = 12, .buf_start = 0x64, .buf_size = 0x94, .buf_end = 0x7c, .palette = { [0] = 0x400, [1] = 0x800, }, }, .win[0] = &(struct s3c_fb_win_variant) { .palette_sz = 256, .valid_bpp = VALID_BPP1248 | VALID_BPP(16) | VALID_BPP(24), }, .win[1] = &(struct s3c_fb_win_variant) { .has_osd_c = 1, .has_osd_alpha = 1, .palette_sz = 256, .valid_bpp = (VALID_BPP1248 | VALID_BPP(16) | VALID_BPP(18) | VALID_BPP(19) | VALID_BPP(24) | VALID_BPP(25) | VALID_BPP(28)), }, }; static struct platform_device_id s3c_fb_driver_ids[] = { { .name = "s3c-fb", .driver_data = (unsigned long)&s3c_fb_data_64xx, }, { .name = "s5pc100-fb", .driver_data = (unsigned long)&s3c_fb_data_s5pc100, }, { .name = "s5pv210-fb", .driver_data = (unsigned long)&s3c_fb_data_s5pv210, }, { .name = "s3c2443-fb", .driver_data = (unsigned long)&s3c_fb_data_s3c2443, }, {}, }; MODULE_DEVICE_TABLE(platform, s3c_fb_driver_ids); static struct platform_driver s3c_fb_driver = { .probe = s3c_fb_probe, .remove = __devexit_p(s3c_fb_remove), .suspend = s3c_fb_suspend, .resume = s3c_fb_resume, .id_table = s3c_fb_driver_ids, .driver = { .name = "s3c-fb", .owner = THIS_MODULE, }, }; static int __init s3c_fb_init(void) { return platform_driver_register(&s3c_fb_driver); } static void __exit s3c_fb_cleanup(void) { platform_driver_unregister(&s3c_fb_driver); } module_init(s3c_fb_init); module_exit(s3c_fb_cleanup); MODULE_AUTHOR("Ben Dooks "); MODULE_DESCRIPTION("Samsung S3C SoC Framebuffer driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:s3c-fb");