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