--- /dev/null
+/* linux/drivers/video/s3c-fb.c
+ *
+ * Copyright 2008 Openmoko Inc.
+ * Copyright 2008 Simtec Electronics
+ * Ben Dooks <ben@simtec.co.uk>
+ * 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 <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/init.h>
+#include <linux/gfp.h>
+#include <linux/clk.h>
+#include <linux/fb.h>
+#include <linux/io.h>
+
+#include <mach/map.h>
+#include <mach/regs-fb.h>
+#include <plat/fb.h>
+
+/* 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, some of the functions that get called are derived from including
+ * <mach/regs-fb.h> as they are specific to the architecture that the code
+ * is being built for.
+*/
+
+#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 */
+
+struct s3c_fb;
+
+/**
+ * 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.
+ * @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;
+
+ u32 *palette_buffer;
+ u32 pseudo_palette[16];
+ unsigned int index;
+};
+
+/**
+ * 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.
+ * @enabled: A bitmask of enabled hardware windows.
+ * @pdata: The platform configuration data passed with the device.
+ * @windows: The hardware windows that have been claimed.
+ */
+struct s3c_fb {
+ struct device *dev;
+ struct resource *regs_res;
+ struct clk *bus_clk;
+ void __iomem *regs;
+
+ unsigned char enabled;
+
+ struct s3c_fb_platdata *pdata;
+ struct s3c_fb_win *windows[S3C_FB_MAX_WIN];
+};
+
+/**
+ * s3c_fb_win_has_palette() - determine if a mode has a palette
+ * @win: The window number being queried.
+ * @bpp: The number of bits per pixel to test.
+ *
+ * Work out if the given window supports palletised data at the specified bpp.
+ */
+static int s3c_fb_win_has_palette(unsigned int win, unsigned int bpp)
+{
+ return s3c_fb_win_pal_size(win) <= (1 << 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->index, 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 (!s3c_fb_win_has_palette(win->index, var->bits_per_pixel)) {
+ /* 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);
+}
+
+/**
+ * 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;
+ int win_no = win->index;
+ u32 data;
+ u32 pagewidth;
+ int clkdiv;
+
+ dev_dbg(sfb->dev, "setting framebuffer parameters\n");
+
+ switch (var->bits_per_pixel) {
+ case 32:
+ case 24:
+ case 16:
+ case 12:
+ info->fix.visual = FB_VISUAL_TRUECOLOR;
+ break;
+ case 8:
+ if (s3c_fb_win_has_palette(win_no, 8))
+ 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;
+
+ /* disable the window whilst we update it */
+ writel(0, regs + WINCON(win_no));
+
+ /* use window 0 as the basis for the lcd output timings */
+
+ if (win_no == 0) {
+ 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 */
+
+ 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 + VIDTCON0);
+
+ data = VIDTCON1_HBPD(var->left_margin - 1) |
+ VIDTCON1_HFPD(var->right_margin - 1) |
+ VIDTCON1_HSPW(var->hsync_len - 1);
+
+ writel(data, regs + VIDTCON1);
+
+ data = VIDTCON2_LINEVAL(var->yres - 1) |
+ VIDTCON2_HOZVAL(var->xres - 1);
+ writel(data, regs + VIDTCON2);
+ }
+
+ /* write the buffer address */
+
+ writel(info->fix.smem_start, regs + VIDW_BUF_START(win_no));
+
+ data = info->fix.smem_start + info->fix.line_length * var->yres;
+ writel(data, regs + VIDW_BUF_END(win_no));
+
+ 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 + VIDW_BUF_SIZE(win_no));
+
+ /* write 'OSD' registers to control position of framebuffer */
+
+ data = VIDOSDxA_TOPLEFT_X(0) | VIDOSDxA_TOPLEFT_Y(0);
+ writel(data, regs + VIDOSD_A(win_no));
+
+ 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));
+
+ data = var->xres * var->yres;
+ if (s3c_fb_has_osd_d(win_no)) {
+ writel(data, regs + VIDOSD_D(win_no));
+ writel(0, regs + VIDOSD_C(win_no));
+ } else
+ writel(data, regs + VIDOSD_C(win_no));
+
+ 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 != 0)
+ data |= WINCON1_BPPMODE_25BPP_A1888;
+ else
+ data |= WINCON0_BPPMODE_24BPP_888;
+
+ data |= WINCONx_BURSTLEN_16WORD;
+ break;
+ }
+
+ writel(data, regs + WINCON(win_no));
+ writel(0x0, regs + WINxMAP(win_no));
+
+ 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 + s3c_fb_pal_reg(win->index, reg);
+
+ 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 (s3c_fb_pal_is16(win->index))
+ writew(value, palreg);
+ else
+ writel(value, palreg);
+
+ 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 < s3c_fb_win_pal_size(win->index)) {
+ 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 + WINCON(index));
+
+ 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 + WINxMAP(index));
+ break;
+
+ case FB_BLANK_UNBLANK:
+ writel(0x0, sfb->regs + WINxMAP(index));
+ 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 + WINCON(index));
+
+ /* 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 == 0)
+ s3c_fb_enable(sfb, blank_mode != FB_BLANK_POWERDOWN ? 1 : 0);
+
+ return 0;
+}
+
+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,
+};
+
+/**
+ * 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;
+
+ 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)
+{
+ fb_dealloc_cmap(&win->fbinfo->cmap);
+ unregister_framebuffer(win->fbinfo);
+ s3c_fb_free_memory(sfb, win);
+}
+
+/**
+ * s3c_fb_probe_win() - register an hardware window
+ * @sfb: The base resources for the hardware
+ * @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 **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\n", win_no);
+
+ palette_size = s3c_fb_win_pal_size(win_no);
+
+ 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;
+ var = &fbinfo->var;
+ 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");
+ goto err_framebuffer;
+ }
+
+ /* setup the r/b/g positions for the window's palette */
+ s3c_fb_init_palette(win_no, &win->palette);
+
+ /* 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");
+ goto err_alloc_mem;
+ }
+
+ /* create initial colour map */
+
+ ret = fb_alloc_cmap(&fbinfo->cmap, s3c_fb_win_pal_size(win_no), 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");
+ goto err_alloc_mem;
+ }
+
+ *res = win;
+ dev_info(sfb->dev, "window %d: fb %s\n", win_no, fbinfo->fix.id);
+
+ return 0;
+
+err_alloc_mem:
+ s3c_fb_free_memory(sfb, win);
+
+err_framebuffer:
+ unregister_framebuffer(fbinfo);
+ return ret;
+}
+
+/**
+ * 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;
+
+ writel(0, regs + WINCON(win));
+ writel(0xffffff, regs + WxKEYCONy(win, 0));
+ writel(0xffffff, regs + WxKEYCONy(win, 1));
+
+ writel(0, regs + VIDOSD_A(win));
+ writel(0, regs + VIDOSD_B(win));
+ writel(0, regs + VIDOSD_C(win));
+}
+
+static int __devinit s3c_fb_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct s3c_fb_platdata *pd;
+ struct s3c_fb *sfb;
+ struct resource *res;
+ int win;
+ int ret = 0;
+
+ 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;
+ }
+
+ sfb->dev = dev;
+ sfb->pdata = pd;
+
+ 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;
+ }
+
+ 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 < S3C_FB_MAX_WIN; win++)
+ s3c_fb_clear_win(sfb, win);
+
+ /* we have the register setup, start allocating framebuffers */
+
+ for (win = 0; win < S3C_FB_MAX_WIN; win++) {
+ if (!pd->win[win])
+ continue;
+
+ ret = s3c_fb_probe_win(sfb, 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_ioremap;
+ }
+ }
+
+ platform_set_drvdata(pdev, sfb);
+
+ return 0;
+
+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++)
+ s3c_fb_release_win(sfb, sfb->windows[win]);
+
+ 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; 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_win *win;
+ int win_no;
+
+ clk_enable(sfb->bus_clk);
+
+ 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
+
+static struct platform_driver s3c_fb_driver = {
+ .probe = s3c_fb_probe,
+ .remove = s3c_fb_remove,
+ .suspend = s3c_fb_suspend,
+ .resume = s3c_fb_resume,
+ .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 <ben@simtec.co.uk>");
+MODULE_DESCRIPTION("Samsung S3C SoC Framebuffer driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:s3c-fb");
projects / firefly-linux-kernel-4.4.55.git / commitdiff