Initial import

1 files changed, 320 insertions, 0 deletions

diff --git a/drivers/video/fbdev/efifb.c b/drivers/video/fbdev/efifb.c
new file mode 100644
index 000000000..4bfff349b
--- /dev/null
+++ b/drivers/video/fbdev/efifb.c
@@ -0,0 +1,320 @@
+/*
+ * 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 <linux/dmi.h>
+#include <linux/pci.h>
+#include <video/vga.h>
+#include <asm/sysfb.h>
+
+static bool request_mem_succeeded = false;
+
+static struct fb_var_screeninfo efifb_defined = {
+	.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 = {
+	.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 void efifb_destroy(struct fb_info *info)
+{
+	if (info->screen_base)
+		iounmap(info->screen_base);
+	if (request_mem_succeeded)
+		release_mem_region(info->apertures->ranges[0].base,
+				   info->apertures->ranges[0].size);
+	fb_dealloc_cmap(&info->cmap);
+}
+
+static struct fb_ops efifb_ops = {
+	.owner		= THIS_MODULE,
+	.fb_destroy	= efifb_destroy,
+	.fb_setcolreg	= efifb_setcolreg,
+	.fb_fillrect	= cfb_fillrect,
+	.fb_copyarea	= cfb_copyarea,
+	.fb_imageblit	= cfb_imageblit,
+};
+
+static int efifb_setup(char *options)
+{
+	char *this_opt;
+	int i;
+
+	if (options && *options) {
+		while ((this_opt = strsep(&options, ",")) != NULL) {
+			if (!*this_opt) continue;
+
+			for (i = 0; i < M_UNKNOWN; i++) {
+				if (efifb_dmi_list[i].base != 0 &&
+				    !strcmp(this_opt, efifb_dmi_list[i].optname)) {
+					screen_info.lfb_base = efifb_dmi_list[i].base;
+					screen_info.lfb_linelength = efifb_dmi_list[i].stride;
+					screen_info.lfb_width = efifb_dmi_list[i].width;
+					screen_info.lfb_height = efifb_dmi_list[i].height;
+				}
+			}
+			if (!strncmp(this_opt, "base:", 5))
+				screen_info.lfb_base = simple_strtoul(this_opt+5, NULL, 0);
+			else if (!strncmp(this_opt, "stride:", 7))
+				screen_info.lfb_linelength = simple_strtoul(this_opt+7, NULL, 0) * 4;
+			else if (!strncmp(this_opt, "height:", 7))
+				screen_info.lfb_height = simple_strtoul(this_opt+7, NULL, 0);
+			else if (!strncmp(this_opt, "width:", 6))
+				screen_info.lfb_width = simple_strtoul(this_opt+6, NULL, 0);
+		}
+	}
+
+	return 0;
+}
+
+static int efifb_probe(struct platform_device *dev)
+{
+	struct fb_info *info;
+	int err;
+	unsigned int size_vmode;
+	unsigned int size_remap;
+	unsigned int size_total;
+	char *option = NULL;
+
+	if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
+		return -ENODEV;
+
+	if (fb_get_options("efifb", &option))
+		return -ENODEV;
+	efifb_setup(option);
+
+	/* We don't get linelength from UGA Draw Protocol, only from
+	 * EFI Graphics Protocol.  So if it's not in DMI, and it's not
+	 * passed in from the user, we really can't use the framebuffer.
+	 */
+	if (!screen_info.lfb_linelength)
+		return -ENODEV;
+
+	if (!screen_info.lfb_depth)
+		screen_info.lfb_depth = 32;
+	if (!screen_info.pages)
+		screen_info.pages = 1;
+	if (!screen_info.lfb_base) {
+		printk(KERN_DEBUG "efifb: invalid framebuffer address\n");
+		return -ENODEV;
+	}
+	printk(KERN_INFO "efifb: probing for efifb\n");
+
+	/* just assume they're all unset if any are */
+	if (!screen_info.blue_size) {
+		screen_info.blue_size = 8;
+		screen_info.blue_pos = 0;
+		screen_info.green_size = 8;
+		screen_info.green_pos = 8;
+		screen_info.red_size = 8;
+		screen_info.red_pos = 16;
+		screen_info.rsvd_size = 8;
+		screen_info.rsvd_pos = 24;
+	}
+
+	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_total)
+		size_remap = size_total;
+	if (size_remap % PAGE_SIZE)
+		size_remap += PAGE_SIZE - (size_remap % PAGE_SIZE);
+	efifb_fix.smem_len = size_remap;
+
+	if (request_mem_region(efifb_fix.smem_start, size_remap, "efifb")) {
+		request_mem_succeeded = true;
+	} else {
+		/* 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) {
+		printk(KERN_ERR "efifb: cannot allocate framebuffer\n");
+		err = -ENOMEM;
+		goto err_release_mem;
+	}
+	platform_set_drvdata(dev, info);
+	info->pseudo_palette = info->par;
+	info->par = NULL;
+
+	info->apertures = alloc_apertures(1);
+	if (!info->apertures) {
+		err = -ENOMEM;
+		goto err_release_fb;
+	}
+	info->apertures->ranges[0].base = efifb_fix.smem_start;
+	info->apertures->ranges[0].size = size_remap;
+
+	info->screen_base = ioremap_wc(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_release_fb;
+	}
+
+	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 | FBINFO_MISC_FIRMWARE;
+
+	if ((err = fb_alloc_cmap(&info->cmap, 256, 0)) < 0) {
+		printk(KERN_ERR "efifb: cannot allocate colormap\n");
+		goto err_unmap;
+	}
+	if ((err = register_framebuffer(info)) < 0) {
+		printk(KERN_ERR "efifb: cannot register framebuffer\n");
+		goto err_fb_dealoc;
+	}
+	fb_info(info, "%s frame buffer device\n", info->fix.id);
+	return 0;
+
+err_fb_dealoc:
+	fb_dealloc_cmap(&info->cmap);
+err_unmap:
+	iounmap(info->screen_base);
+err_release_fb:
+	framebuffer_release(info);
+err_release_mem:
+	if (request_mem_succeeded)
+		release_mem_region(efifb_fix.smem_start, size_total);
+	return err;
+}
+
+static int efifb_remove(struct platform_device *pdev)
+{
+	struct fb_info *info = platform_get_drvdata(pdev);
+
+	unregister_framebuffer(info);
+	framebuffer_release(info);
+
+	return 0;
+}
+
+static struct platform_driver efifb_driver = {
+	.driver = {
+		.name = "efi-framebuffer",
+	},
+	.probe = efifb_probe,
+	.remove = efifb_remove,
+};
+
+module_platform_driver(efifb_driver);
+MODULE_LICENSE("GPL");