video: move fbdev to drivers/video/fbdev

The drivers/video directory is a mess. It contains generic video related
files, directories for backlight, console, linux logo, lots of fbdev
device drivers, fbdev framework files.

Make some order into the chaos by creating drivers/video/fbdev
directory, and move all fbdev related files there.

No functionality is changed, although I guess it is possible that some
subtle Makefile build order related issue could be created by this
patch.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Rob Clark <robdclark@gmail.com>
Acked-by: Jingoo Han <jg1.han@samsung.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 610 insertions, 0 deletions

diff --git a/drivers/video/fbdev/vfb.c b/drivers/video/fbdev/vfb.c
new file mode 100644
index 000000000000..70a897b1e458
--- /dev/null
+++ b/drivers/video/fbdev/vfb.c
@@ -0,0 +1,610 @@
+/*
+ *  linux/drivers/video/vfb.c -- Virtual frame buffer device
+ *
+ *      Copyright (C) 2002 James Simmons
+ *
+ *      Copyright (C) 1997 Geert Uytterhoeven
+ *
+ *  This file is subject to the terms and conditions of the GNU General Public
+ *  License. See the file COPYING in the main directory of this archive for
+ *  more details.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/vmalloc.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+
+#include <linux/fb.h>
+#include <linux/init.h>
+
+    /*
+     *  RAM we reserve for the frame buffer. This defines the maximum screen
+     *  size
+     *
+     *  The default can be overridden if the driver is compiled as a module
+     */
+
+#define VIDEOMEMSIZE    (1*1024*1024)   /* 1 MB */
+
+static void *videomemory;
+static u_long videomemorysize = VIDEOMEMSIZE;
+module_param(videomemorysize, ulong, 0);
+
+/**********************************************************************
+ *
+ * Memory management
+ *
+ **********************************************************************/
+static void *rvmalloc(unsigned long size)
+{
+        void *mem;
+        unsigned long adr;
+
+        size = PAGE_ALIGN(size);
+        mem = vmalloc_32(size);
+        if (!mem)
+                return NULL;
+
+        memset(mem, 0, size); /* Clear the ram out, no junk to the user */
+        adr = (unsigned long) mem;
+        while (size > 0) {
+                SetPageReserved(vmalloc_to_page((void *)adr));
+                adr += PAGE_SIZE;
+                size -= PAGE_SIZE;
+        }
+
+        return mem;
+}
+
+static void rvfree(void *mem, unsigned long size)
+{
+        unsigned long adr;
+
+        if (!mem)
+                return;
+
+        adr = (unsigned long) mem;
+        while ((long) size > 0) {
+                ClearPageReserved(vmalloc_to_page((void *)adr));
+                adr += PAGE_SIZE;
+                size -= PAGE_SIZE;
+        }
+        vfree(mem);
+}
+
+static struct fb_var_screeninfo vfb_default = {
+        .xres =         640,
+        .yres =         480,
+        .xres_virtual = 640,
+        .yres_virtual = 480,
+        .bits_per_pixel = 8,
+        .red =          { 0, 8, 0 },
+        .green =        { 0, 8, 0 },
+        .blue =         { 0, 8, 0 },
+        .activate =     FB_ACTIVATE_TEST,
+        .height =       -1,
+        .width =        -1,
+        .pixclock =     20000,
+        .left_margin =  64,
+        .right_margin = 64,
+        .upper_margin = 32,
+        .lower_margin = 32,
+        .hsync_len =    64,
+        .vsync_len =    2,
+        .vmode =        FB_VMODE_NONINTERLACED,
+};
+
+static struct fb_fix_screeninfo vfb_fix = {
+        .id =           "Virtual FB",
+        .type =         FB_TYPE_PACKED_PIXELS,
+        .visual =       FB_VISUAL_PSEUDOCOLOR,
+        .xpanstep =     1,
+        .ypanstep =     1,
+        .ywrapstep =    1,
+        .accel =        FB_ACCEL_NONE,
+};
+
+static bool vfb_enable __initdata = 0;  /* disabled by default */
+module_param(vfb_enable, bool, 0);
+
+static int vfb_check_var(struct fb_var_screeninfo *var,
+                         struct fb_info *info);
+static int vfb_set_par(struct fb_info *info);
+static int vfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
+                         u_int transp, struct fb_info *info);
+static int vfb_pan_display(struct fb_var_screeninfo *var,
+                           struct fb_info *info);
+static int vfb_mmap(struct fb_info *info,
+                    struct vm_area_struct *vma);
+
+static struct fb_ops vfb_ops = {
+        .fb_read        = fb_sys_read,
+        .fb_write       = fb_sys_write,
+        .fb_check_var   = vfb_check_var,
+        .fb_set_par     = vfb_set_par,
+        .fb_setcolreg   = vfb_setcolreg,
+        .fb_pan_display = vfb_pan_display,
+        .fb_fillrect    = sys_fillrect,
+        .fb_copyarea    = sys_copyarea,
+        .fb_imageblit   = sys_imageblit,
+        .fb_mmap        = vfb_mmap,
+};
+
+    /*
+     *  Internal routines
+     */
+
+static u_long get_line_length(int xres_virtual, int bpp)
+{
+        u_long length;
+
+        length = xres_virtual * bpp;
+        length = (length + 31) & ~31;
+        length >>= 3;
+        return (length);
+}
+
+    /*
+     *  Setting the video mode has been split into two parts.
+     *  First part, xxxfb_check_var, must not write anything
+     *  to hardware, it should only verify and adjust var.
+     *  This means it doesn't alter par but it does use hardware
+     *  data from it to check this var. 
+     */
+
+static int vfb_check_var(struct fb_var_screeninfo *var,
+                         struct fb_info *info)
+{
+        u_long line_length;
+
+        /*
+         *  FB_VMODE_CONUPDATE and FB_VMODE_SMOOTH_XPAN are equal!
+         *  as FB_VMODE_SMOOTH_XPAN is only used internally
+         */
+
+        if (var->vmode & FB_VMODE_CONUPDATE) {
+                var->vmode |= FB_VMODE_YWRAP;
+                var->xoffset = info->var.xoffset;
+                var->yoffset = info->var.yoffset;
+        }
+
+        /*
+         *  Some very basic checks
+         */
+        if (!var->xres)
+                var->xres = 1;
+        if (!var->yres)
+                var->yres = 1;
+        if (var->xres > var->xres_virtual)
+                var->xres_virtual = var->xres;
+        if (var->yres > var->yres_virtual)
+                var->yres_virtual = var->yres;
+        if (var->bits_per_pixel <= 1)
+                var->bits_per_pixel = 1;
+        else if (var->bits_per_pixel <= 8)
+                var->bits_per_pixel = 8;
+        else if (var->bits_per_pixel <= 16)
+                var->bits_per_pixel = 16;
+        else if (var->bits_per_pixel <= 24)
+                var->bits_per_pixel = 24;
+        else if (var->bits_per_pixel <= 32)
+                var->bits_per_pixel = 32;
+        else
+                return -EINVAL;
+
+        if (var->xres_virtual < var->xoffset + var->xres)
+                var->xres_virtual = var->xoffset + var->xres;
+        if (var->yres_virtual < var->yoffset + var->yres)
+                var->yres_virtual = var->yoffset + var->yres;
+
+        /*
+         *  Memory limit
+         */
+        line_length =
+            get_line_length(var->xres_virtual, var->bits_per_pixel);
+        if (line_length * var->yres_virtual > videomemorysize)
+                return -ENOMEM;
+
+        /*
+         * Now that we checked it we alter var. The reason being is that the video
+         * mode passed in might not work but slight changes to it might make it 
+         * work. This way we let the user know what is acceptable.
+         */
+        switch (var->bits_per_pixel) {
+        case 1:
+        case 8:
+                var->red.offset = 0;
+                var->red.length = 8;
+                var->green.offset = 0;
+                var->green.length = 8;
+                var->blue.offset = 0;
+                var->blue.length = 8;
+                var->transp.offset = 0;
+                var->transp.length = 0;
+                break;
+        case 16:                /* RGBA 5551 */
+                if (var->transp.length) {
+                        var->red.offset = 0;
+                        var->red.length = 5;
+                        var->green.offset = 5;
+                        var->green.length = 5;
+                        var->blue.offset = 10;
+                        var->blue.length = 5;
+                        var->transp.offset = 15;
+                        var->transp.length = 1;
+                } else {        /* RGB 565 */
+                        var->red.offset = 0;
+                        var->red.length = 5;
+                        var->green.offset = 5;
+                        var->green.length = 6;
+                        var->blue.offset = 11;
+                        var->blue.length = 5;
+                        var->transp.offset = 0;
+                        var->transp.length = 0;
+                }
+                break;
+        case 24:                /* RGB 888 */
+                var->red.offset = 0;
+                var->red.length = 8;
+                var->green.offset = 8;
+                var->green.length = 8;
+                var->blue.offset = 16;
+                var->blue.length = 8;
+                var->transp.offset = 0;
+                var->transp.length = 0;
+                break;
+        case 32:                /* RGBA 8888 */
+                var->red.offset = 0;
+                var->red.length = 8;
+                var->green.offset = 8;
+                var->green.length = 8;
+                var->blue.offset = 16;
+                var->blue.length = 8;
+                var->transp.offset = 24;
+                var->transp.length = 8;
+                break;
+        }
+        var->red.msb_right = 0;
+        var->green.msb_right = 0;
+        var->blue.msb_right = 0;
+        var->transp.msb_right = 0;
+
+        return 0;
+}
+
+/* This routine actually sets the video mode. It's in here where we
+ * the hardware state info->par and fix which can be affected by the 
+ * change in par. For this driver it doesn't do much. 
+ */
+static int vfb_set_par(struct fb_info *info)
+{
+        info->fix.line_length = get_line_length(info->var.xres_virtual,
+                                                info->var.bits_per_pixel);
+        return 0;
+}
+
+    /*
+     *  Set a single color register. The values supplied are already
+     *  rounded down to the hardware's capabilities (according to the
+     *  entries in the var structure). Return != 0 for invalid regno.
+     */
+
+static int vfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
+                         u_int transp, struct fb_info *info)
+{
+        if (regno >= 256)       /* no. of hw registers */
+                return 1;
+        /*
+         * Program hardware... do anything you want with transp
+         */
+
+        /* grayscale works only partially under directcolor */
+        if (info->var.grayscale) {
+                /* grayscale = 0.30*R + 0.59*G + 0.11*B */
+                red = green = blue =
+                    (red * 77 + green * 151 + blue * 28) >> 8;
+        }
+
+        /* Directcolor:
+         *   var->{color}.offset contains start of bitfield
+         *   var->{color}.length contains length of bitfield
+         *   {hardwarespecific} contains width of RAMDAC
+         *   cmap[X] is programmed to (X << red.offset) | (X << green.offset) | (X << blue.offset)
+         *   RAMDAC[X] is programmed to (red, green, blue)
+         *
+         * Pseudocolor:
+         *    var->{color}.offset is 0 unless the palette index takes less than
+         *                        bits_per_pixel bits and is stored in the upper
+         *                        bits of the pixel value
+         *    var->{color}.length is set so that 1 << length is the number of available
+         *                        palette entries
+         *    cmap is not used
+         *    RAMDAC[X] is programmed to (red, green, blue)
+         *
+         * Truecolor:
+         *    does not use DAC. Usually 3 are present.
+         *    var->{color}.offset contains start of bitfield
+         *    var->{color}.length contains length of bitfield
+         *    cmap is programmed to (red << red.offset) | (green << green.offset) |
+         *                      (blue << blue.offset) | (transp << transp.offset)
+         *    RAMDAC does not exist
+         */
+#define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16)
+        switch (info->fix.visual) {
+        case FB_VISUAL_TRUECOLOR:
+        case FB_VISUAL_PSEUDOCOLOR:
+                red = CNVT_TOHW(red, info->var.red.length);
+                green = CNVT_TOHW(green, info->var.green.length);
+                blue = CNVT_TOHW(blue, info->var.blue.length);
+                transp = CNVT_TOHW(transp, info->var.transp.length);
+                break;
+        case FB_VISUAL_DIRECTCOLOR:
+                red = CNVT_TOHW(red, 8);        /* expect 8 bit DAC */
+                green = CNVT_TOHW(green, 8);
+                blue = CNVT_TOHW(blue, 8);
+                /* hey, there is bug in transp handling... */
+                transp = CNVT_TOHW(transp, 8);
+                break;
+        }
+#undef CNVT_TOHW
+        /* Truecolor has hardware independent palette */
+        if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
+                u32 v;
+
+                if (regno >= 16)
+                        return 1;
+
+                v = (red << info->var.red.offset) |
+                    (green << info->var.green.offset) |
+                    (blue << info->var.blue.offset) |
+                    (transp << info->var.transp.offset);
+                switch (info->var.bits_per_pixel) {
+                case 8:
+                        break;
+                case 16:
+                        ((u32 *) (info->pseudo_palette))[regno] = v;
+                        break;
+                case 24:
+                case 32:
+                        ((u32 *) (info->pseudo_palette))[regno] = v;
+                        break;
+                }
+                return 0;
+        }
+        return 0;
+}
+
+    /*
+     *  Pan or Wrap the Display
+     *
+     *  This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag
+     */
+
+static int vfb_pan_display(struct fb_var_screeninfo *var,
+                           struct fb_info *info)
+{
+        if (var->vmode & FB_VMODE_YWRAP) {
+                if (var->yoffset >= info->var.yres_virtual ||
+                    var->xoffset)
+                        return -EINVAL;
+        } else {
+                if (var->xoffset + info->var.xres > info->var.xres_virtual ||
+                    var->yoffset + info->var.yres > info->var.yres_virtual)
+                        return -EINVAL;
+        }
+        info->var.xoffset = var->xoffset;
+        info->var.yoffset = var->yoffset;
+        if (var->vmode & FB_VMODE_YWRAP)
+                info->var.vmode |= FB_VMODE_YWRAP;
+        else
+                info->var.vmode &= ~FB_VMODE_YWRAP;
+        return 0;
+}
+
+    /*
+     *  Most drivers don't need their own mmap function 
+     */
+
+static int vfb_mmap(struct fb_info *info,
+                    struct vm_area_struct *vma)
+{
+        unsigned long start = vma->vm_start;
+        unsigned long size = vma->vm_end - vma->vm_start;
+        unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
+        unsigned long page, pos;
+
+        if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
+                return -EINVAL;
+        if (size > info->fix.smem_len)
+                return -EINVAL;
+        if (offset > info->fix.smem_len - size)
+                return -EINVAL;
+
+        pos = (unsigned long)info->fix.smem_start + offset;
+
+        while (size > 0) {
+                page = vmalloc_to_pfn((void *)pos);
+                if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED)) {
+                        return -EAGAIN;
+                }
+                start += PAGE_SIZE;
+                pos += PAGE_SIZE;
+                if (size > PAGE_SIZE)
+                        size -= PAGE_SIZE;
+                else
+                        size = 0;
+        }
+
+        return 0;
+
+}
+
+#ifndef MODULE
+/*
+ * The virtual framebuffer driver is only enabled if explicitly
+ * requested by passing 'video=vfb:' (or any actual options).
+ */
+static int __init vfb_setup(char *options)
+{
+        char *this_opt;
+
+        vfb_enable = 0;
+
+        if (!options)
+                return 1;
+
+        vfb_enable = 1;
+
+        if (!*options)
+                return 1;
+
+        while ((this_opt = strsep(&options, ",")) != NULL) {
+                if (!*this_opt)
+                        continue;
+                /* Test disable for backwards compatibility */
+                if (!strcmp(this_opt, "disable"))
+                        vfb_enable = 0;
+        }
+        return 1;
+}
+#endif  /*  MODULE  */
+
+    /*
+     *  Initialisation
+     */
+
+static int vfb_probe(struct platform_device *dev)
+{
+        struct fb_info *info;
+        int retval = -ENOMEM;
+
+        /*
+         * For real video cards we use ioremap.
+         */
+        if (!(videomemory = rvmalloc(videomemorysize)))
+                return retval;
+
+        /*
+         * VFB must clear memory to prevent kernel info
+         * leakage into userspace
+         * VGA-based drivers MUST NOT clear memory if
+         * they want to be able to take over vgacon
+         */
+        memset(videomemory, 0, videomemorysize);
+
+        info = framebuffer_alloc(sizeof(u32) * 256, &dev->dev);
+        if (!info)
+                goto err;
+
+        info->screen_base = (char __iomem *)videomemory;
+        info->fbops = &vfb_ops;
+
+        retval = fb_find_mode(&info->var, info, NULL,
+                              NULL, 0, NULL, 8);
+
+        if (!retval || (retval == 4))
+                info->var = vfb_default;
+        vfb_fix.smem_start = (unsigned long) videomemory;
+        vfb_fix.smem_len = videomemorysize;
+        info->fix = vfb_fix;
+        info->pseudo_palette = info->par;
+        info->par = NULL;
+        info->flags = FBINFO_FLAG_DEFAULT;
+
+        retval = fb_alloc_cmap(&info->cmap, 256, 0);
+        if (retval < 0)
+                goto err1;
+
+        retval = register_framebuffer(info);
+        if (retval < 0)
+                goto err2;
+        platform_set_drvdata(dev, info);
+
+        fb_info(info, "Virtual frame buffer device, using %ldK of video memory\n",
+                videomemorysize >> 10);
+        return 0;
+err2:
+        fb_dealloc_cmap(&info->cmap);
+err1:
+        framebuffer_release(info);
+err:
+        rvfree(videomemory, videomemorysize);
+        return retval;
+}
+
+static int vfb_remove(struct platform_device *dev)
+{
+        struct fb_info *info = platform_get_drvdata(dev);
+
+        if (info) {
+                unregister_framebuffer(info);
+                rvfree(videomemory, videomemorysize);
+                fb_dealloc_cmap(&info->cmap);
+                framebuffer_release(info);
+        }
+        return 0;
+}
+
+static struct platform_driver vfb_driver = {
+        .probe  = vfb_probe,
+        .remove = vfb_remove,
+        .driver = {
+                .name   = "vfb",
+        },
+};
+
+static struct platform_device *vfb_device;
+
+static int __init vfb_init(void)
+{
+        int ret = 0;
+
+#ifndef MODULE
+        char *option = NULL;
+
+        if (fb_get_options("vfb", &option))
+                return -ENODEV;
+        vfb_setup(option);
+#endif
+
+        if (!vfb_enable)
+                return -ENXIO;
+
+        ret = platform_driver_register(&vfb_driver);
+
+        if (!ret) {
+                vfb_device = platform_device_alloc("vfb", 0);
+
+                if (vfb_device)
+                        ret = platform_device_add(vfb_device);
+                else
+                        ret = -ENOMEM;
+
+                if (ret) {
+                        platform_device_put(vfb_device);
+                        platform_driver_unregister(&vfb_driver);
+                }
+        }
+
+        return ret;
+}
+
+module_init(vfb_init);
+
+#ifdef MODULE
+static void __exit vfb_exit(void)
+{
+        platform_device_unregister(vfb_device);
+        platform_driver_unregister(&vfb_driver);
+}
+
+module_exit(vfb_exit);
+
+MODULE_LICENSE("GPL");
+#endif                          /* MODULE */