1 files changed, 232 insertions, 0 deletions

diff --git a/drivers/video/efifb.c b/drivers/video/efifb.c
new file mode 100644
index 000000000000..bd779ae44b1e
--- /dev/null
+++ b/drivers/video/efifb.c
@@ -0,0 +1,232 @@
+/*
+ * Framebuffer driver for EFI/UEFI based system
+ *
+ * (c) 2006 Edgar Hucek <gimli@dark-green.com>
+ * Original efi driver written by Gerd Knorr <kraxel@goldbach.in-berlin.de>
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/fb.h>
+#include <linux/platform_device.h>
+#include <linux/screen_info.h>
+
+#include <video/vga.h>
+
+static struct fb_var_screeninfo efifb_defined __initdata = {
+        .activate               = FB_ACTIVATE_NOW,
+        .height                 = -1,
+        .width                  = -1,
+        .right_margin           = 32,
+        .upper_margin           = 16,
+        .lower_margin           = 4,
+        .vsync_len              = 4,
+        .vmode                  = FB_VMODE_NONINTERLACED,
+};
+
+static struct fb_fix_screeninfo efifb_fix __initdata = {
+        .id                     = "EFI VGA",
+        .type                   = FB_TYPE_PACKED_PIXELS,
+        .accel                  = FB_ACCEL_NONE,
+        .visual                 = FB_VISUAL_TRUECOLOR,
+};
+
+static int efifb_setcolreg(unsigned regno, unsigned red, unsigned green,
+                           unsigned blue, unsigned transp,
+                           struct fb_info *info)
+{
+        /*
+         *  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.
+         */
+
+        if (regno >= info->cmap.len)
+                return 1;
+
+        if (regno < 16) {
+                red   >>= 8;
+                green >>= 8;
+                blue  >>= 8;
+                ((u32 *)(info->pseudo_palette))[regno] =
+                        (red   << info->var.red.offset)   |
+                        (green << info->var.green.offset) |
+                        (blue  << info->var.blue.offset);
+        }
+        return 0;
+}
+
+static struct fb_ops efifb_ops = {
+        .owner          = THIS_MODULE,
+        .fb_setcolreg   = efifb_setcolreg,
+        .fb_fillrect    = cfb_fillrect,
+        .fb_copyarea    = cfb_copyarea,
+        .fb_imageblit   = cfb_imageblit,
+};
+
+static int __init efifb_probe(struct platform_device *dev)
+{
+        struct fb_info *info;
+        int err;
+        unsigned int size_vmode;
+        unsigned int size_remap;
+        unsigned int size_total;
+
+        efifb_fix.smem_start = screen_info.lfb_base;
+        efifb_defined.bits_per_pixel = screen_info.lfb_depth;
+        efifb_defined.xres = screen_info.lfb_width;
+        efifb_defined.yres = screen_info.lfb_height;
+        efifb_fix.line_length = screen_info.lfb_linelength;
+
+        /*   size_vmode -- that is the amount of memory needed for the
+         *                 used video mode, i.e. the minimum amount of
+         *                 memory we need. */
+        size_vmode = efifb_defined.yres * efifb_fix.line_length;
+
+        /*   size_total -- all video memory we have. Used for
+         *                 entries, ressource allocation and bounds
+         *                 checking. */
+        size_total = screen_info.lfb_size;
+        if (size_total < size_vmode)
+                size_total = size_vmode;
+
+        /*   size_remap -- the amount of video memory we are going to
+         *                 use for efifb.  With modern cards it is no
+         *                 option to simply use size_total as that
+         *                 wastes plenty of kernel address space. */
+        size_remap  = size_vmode * 2;
+        if (size_remap < size_vmode)
+                size_remap = size_vmode;
+        if (size_remap > size_total)
+                size_remap = size_total;
+        efifb_fix.smem_len = size_remap;
+
+        if (!request_mem_region(efifb_fix.smem_start, size_total, "efifb"))
+                /* We cannot make this fatal. Sometimes this comes from magic
+                   spaces our resource handlers simply don't know about */
+                printk(KERN_WARNING
+                       "efifb: cannot reserve video memory at 0x%lx\n",
+                        efifb_fix.smem_start);
+
+        info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
+        if (!info) {
+                err = -ENOMEM;
+                goto err_release_mem;
+        }
+        info->pseudo_palette = info->par;
+        info->par = NULL;
+
+        info->screen_base = ioremap(efifb_fix.smem_start, efifb_fix.smem_len);
+        if (!info->screen_base) {
+                printk(KERN_ERR "efifb: abort, cannot ioremap video memory "
+                                "0x%x @ 0x%lx\n",
+                        efifb_fix.smem_len, efifb_fix.smem_start);
+                err = -EIO;
+                goto err_unmap;
+        }
+
+        printk(KERN_INFO "efifb: framebuffer at 0x%lx, mapped to 0x%p, "
+               "using %dk, total %dk\n",
+               efifb_fix.smem_start, info->screen_base,
+               size_remap/1024, size_total/1024);
+        printk(KERN_INFO "efifb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
+               efifb_defined.xres, efifb_defined.yres,
+               efifb_defined.bits_per_pixel, efifb_fix.line_length,
+               screen_info.pages);
+
+        efifb_defined.xres_virtual = efifb_defined.xres;
+        efifb_defined.yres_virtual = efifb_fix.smem_len /
+                                        efifb_fix.line_length;
+        printk(KERN_INFO "efifb: scrolling: redraw\n");
+        efifb_defined.yres_virtual = efifb_defined.yres;
+
+        /* some dummy values for timing to make fbset happy */
+        efifb_defined.pixclock     = 10000000 / efifb_defined.xres *
+                                        1000 / efifb_defined.yres;
+        efifb_defined.left_margin  = (efifb_defined.xres / 8) & 0xf8;
+        efifb_defined.hsync_len    = (efifb_defined.xres / 8) & 0xf8;
+
+        efifb_defined.red.offset    = screen_info.red_pos;
+        efifb_defined.red.length    = screen_info.red_size;
+        efifb_defined.green.offset  = screen_info.green_pos;
+        efifb_defined.green.length  = screen_info.green_size;
+        efifb_defined.blue.offset   = screen_info.blue_pos;
+        efifb_defined.blue.length   = screen_info.blue_size;
+        efifb_defined.transp.offset = screen_info.rsvd_pos;
+        efifb_defined.transp.length = screen_info.rsvd_size;
+
+        printk(KERN_INFO "efifb: %s: "
+               "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
+               "Truecolor",
+               screen_info.rsvd_size,
+               screen_info.red_size,
+               screen_info.green_size,
+               screen_info.blue_size,
+               screen_info.rsvd_pos,
+               screen_info.red_pos,
+               screen_info.green_pos,
+               screen_info.blue_pos);
+
+        efifb_fix.ypanstep  = 0;
+        efifb_fix.ywrapstep = 0;
+
+        info->fbops = &efifb_ops;
+        info->var = efifb_defined;
+        info->fix = efifb_fix;
+        info->flags = FBINFO_FLAG_DEFAULT;
+
+        if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
+                err = -ENOMEM;
+                goto err_unmap;
+        }
+        if (register_framebuffer(info) < 0) {
+                err = -EINVAL;
+                goto err_fb_dealoc;
+        }
+        printk(KERN_INFO "fb%d: %s frame buffer device\n",
+               info->node, info->fix.id);
+        return 0;
+
+err_fb_dealoc:
+        fb_dealloc_cmap(&info->cmap);
+err_unmap:
+        iounmap(info->screen_base);
+        framebuffer_release(info);
+err_release_mem:
+        release_mem_region(efifb_fix.smem_start, size_total);
+        return err;
+}
+
+static struct platform_driver efifb_driver = {
+        .probe  = efifb_probe,
+        .driver = {
+                .name   = "efifb",
+        },
+};
+
+static struct platform_device efifb_device = {
+        .name   = "efifb",
+};
+
+static int __init efifb_init(void)
+{
+        int ret;
+
+        if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
+                return -ENODEV;
+
+        ret = platform_driver_register(&efifb_driver);
+
+        if (!ret) {
+                ret = platform_device_register(&efifb_device);
+                if (ret)
+                        platform_driver_unregister(&efifb_driver);
+        }
+        return ret;
+}
+module_init(efifb_init);
+
+MODULE_LICENSE("GPL");