458 lines
12 KiB
C
458 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0
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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/kernel.h>
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#include <linux/efi.h>
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#include <linux/errno.h>
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#include <linux/fb.h>
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#include <linux/pci.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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#include <asm/efi.h>
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#include <drm/drm_utils.h> /* For drm_get_panel_orientation_quirk */
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#include <drm/drm_connector.h> /* For DRM_MODE_PANEL_ORIENTATION_* */
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static bool request_mem_succeeded = false;
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static bool nowc = false;
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static struct fb_var_screeninfo efifb_defined = {
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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 = {
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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 >>= 16 - info->var.red.length;
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green >>= 16 - info->var.green.length;
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blue >>= 16 - info->var.blue.length;
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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 void efifb_destroy(struct fb_info *info)
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{
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if (info->screen_base)
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iounmap(info->screen_base);
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if (request_mem_succeeded)
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release_mem_region(info->apertures->ranges[0].base,
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info->apertures->ranges[0].size);
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fb_dealloc_cmap(&info->cmap);
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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_destroy = efifb_destroy,
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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 efifb_setup(char *options)
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{
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char *this_opt;
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if (options && *options) {
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while ((this_opt = strsep(&options, ",")) != NULL) {
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if (!*this_opt) continue;
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efifb_setup_from_dmi(&screen_info, this_opt);
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if (!strncmp(this_opt, "base:", 5))
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screen_info.lfb_base = simple_strtoul(this_opt+5, NULL, 0);
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else if (!strncmp(this_opt, "stride:", 7))
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screen_info.lfb_linelength = simple_strtoul(this_opt+7, NULL, 0) * 4;
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else if (!strncmp(this_opt, "height:", 7))
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screen_info.lfb_height = simple_strtoul(this_opt+7, NULL, 0);
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else if (!strncmp(this_opt, "width:", 6))
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screen_info.lfb_width = simple_strtoul(this_opt+6, NULL, 0);
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else if (!strcmp(this_opt, "nowc"))
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nowc = true;
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}
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}
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return 0;
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}
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static inline bool fb_base_is_valid(void)
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{
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if (screen_info.lfb_base)
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return true;
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if (!(screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE))
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return false;
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if (screen_info.ext_lfb_base)
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return true;
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return false;
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}
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#define efifb_attr_decl(name, fmt) \
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static ssize_t name##_show(struct device *dev, \
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struct device_attribute *attr, \
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char *buf) \
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{ \
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return sprintf(buf, fmt "\n", (screen_info.lfb_##name)); \
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} \
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static DEVICE_ATTR_RO(name)
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efifb_attr_decl(base, "0x%x");
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efifb_attr_decl(linelength, "%u");
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efifb_attr_decl(height, "%u");
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efifb_attr_decl(width, "%u");
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efifb_attr_decl(depth, "%u");
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static struct attribute *efifb_attrs[] = {
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&dev_attr_base.attr,
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&dev_attr_linelength.attr,
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&dev_attr_width.attr,
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&dev_attr_height.attr,
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&dev_attr_depth.attr,
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NULL
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};
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ATTRIBUTE_GROUPS(efifb);
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static bool pci_dev_disabled; /* FB base matches BAR of a disabled device */
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static struct pci_dev *efifb_pci_dev; /* dev with BAR covering the efifb */
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static struct resource *bar_resource;
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static u64 bar_offset;
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static int efifb_probe(struct platform_device *dev)
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{
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struct fb_info *info;
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int err, orientation;
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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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char *option = NULL;
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if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI || pci_dev_disabled)
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return -ENODEV;
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if (fb_get_options("efifb", &option))
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return -ENODEV;
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efifb_setup(option);
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/* We don't get linelength from UGA Draw Protocol, only from
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* EFI Graphics Protocol. So if it's not in DMI, and it's not
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* passed in from the user, we really can't use the framebuffer.
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*/
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if (!screen_info.lfb_linelength)
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return -ENODEV;
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if (!screen_info.lfb_depth)
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screen_info.lfb_depth = 32;
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if (!screen_info.pages)
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screen_info.pages = 1;
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if (!fb_base_is_valid()) {
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printk(KERN_DEBUG "efifb: invalid framebuffer address\n");
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return -ENODEV;
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}
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printk(KERN_INFO "efifb: probing for efifb\n");
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/* just assume they're all unset if any are */
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if (!screen_info.blue_size) {
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screen_info.blue_size = 8;
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screen_info.blue_pos = 0;
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screen_info.green_size = 8;
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screen_info.green_pos = 8;
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screen_info.red_size = 8;
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screen_info.red_pos = 16;
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screen_info.rsvd_size = 8;
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screen_info.rsvd_pos = 24;
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}
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efifb_fix.smem_start = screen_info.lfb_base;
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if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE) {
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u64 ext_lfb_base;
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ext_lfb_base = (u64)(unsigned long)screen_info.ext_lfb_base << 32;
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efifb_fix.smem_start |= ext_lfb_base;
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}
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if (bar_resource &&
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bar_resource->start + bar_offset != efifb_fix.smem_start) {
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dev_info(&efifb_pci_dev->dev,
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"BAR has moved, updating efifb address\n");
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efifb_fix.smem_start = bar_resource->start + bar_offset;
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}
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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_total)
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size_remap = size_total;
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if (size_remap % PAGE_SIZE)
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size_remap += PAGE_SIZE - (size_remap % PAGE_SIZE);
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efifb_fix.smem_len = size_remap;
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if (request_mem_region(efifb_fix.smem_start, size_remap, "efifb")) {
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request_mem_succeeded = true;
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} else {
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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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pr_warn("efifb: cannot reserve video memory at 0x%lx\n",
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efifb_fix.smem_start);
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}
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info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
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if (!info) {
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pr_err("efifb: cannot allocate framebuffer\n");
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err = -ENOMEM;
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goto err_release_mem;
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}
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platform_set_drvdata(dev, info);
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info->pseudo_palette = info->par;
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info->par = NULL;
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info->apertures = alloc_apertures(1);
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if (!info->apertures) {
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err = -ENOMEM;
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goto err_release_fb;
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}
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info->apertures->ranges[0].base = efifb_fix.smem_start;
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info->apertures->ranges[0].size = size_remap;
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if (nowc)
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info->screen_base = ioremap(efifb_fix.smem_start, efifb_fix.smem_len);
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else
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info->screen_base = ioremap_wc(efifb_fix.smem_start, efifb_fix.smem_len);
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if (!info->screen_base) {
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pr_err("efifb: abort, cannot ioremap video memory 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_release_fb;
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}
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pr_info("efifb: framebuffer at 0x%lx, using %dk, total %dk\n",
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efifb_fix.smem_start, size_remap/1024, size_total/1024);
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pr_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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pr_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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pr_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 | FBINFO_MISC_FIRMWARE;
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orientation = drm_get_panel_orientation_quirk(efifb_defined.xres,
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efifb_defined.yres);
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switch (orientation) {
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default:
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info->fbcon_rotate_hint = FB_ROTATE_UR;
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break;
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case DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP:
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info->fbcon_rotate_hint = FB_ROTATE_UD;
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break;
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case DRM_MODE_PANEL_ORIENTATION_LEFT_UP:
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info->fbcon_rotate_hint = FB_ROTATE_CCW;
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break;
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case DRM_MODE_PANEL_ORIENTATION_RIGHT_UP:
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info->fbcon_rotate_hint = FB_ROTATE_CW;
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break;
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}
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err = sysfs_create_groups(&dev->dev.kobj, efifb_groups);
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if (err) {
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pr_err("efifb: cannot add sysfs attrs\n");
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goto err_unmap;
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}
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err = fb_alloc_cmap(&info->cmap, 256, 0);
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if (err < 0) {
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pr_err("efifb: cannot allocate colormap\n");
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goto err_groups;
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}
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err = register_framebuffer(info);
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if (err < 0) {
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pr_err("efifb: cannot register framebuffer\n");
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goto err_fb_dealoc;
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}
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fb_info(info, "%s frame buffer device\n", 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_groups:
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sysfs_remove_groups(&dev->dev.kobj, efifb_groups);
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err_unmap:
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iounmap(info->screen_base);
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err_release_fb:
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framebuffer_release(info);
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err_release_mem:
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if (request_mem_succeeded)
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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 int efifb_remove(struct platform_device *pdev)
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{
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struct fb_info *info = platform_get_drvdata(pdev);
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unregister_framebuffer(info);
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sysfs_remove_groups(&pdev->dev.kobj, efifb_groups);
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framebuffer_release(info);
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return 0;
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}
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static struct platform_driver efifb_driver = {
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.driver = {
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.name = "efi-framebuffer",
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},
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.probe = efifb_probe,
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.remove = efifb_remove,
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};
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builtin_platform_driver(efifb_driver);
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#if defined(CONFIG_PCI)
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static void record_efifb_bar_resource(struct pci_dev *dev, int idx, u64 offset)
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{
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u16 word;
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efifb_pci_dev = dev;
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pci_read_config_word(dev, PCI_COMMAND, &word);
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if (!(word & PCI_COMMAND_MEMORY)) {
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pci_dev_disabled = true;
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dev_err(&dev->dev,
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"BAR %d: assigned to efifb but device is disabled!\n",
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idx);
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return;
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}
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bar_resource = &dev->resource[idx];
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bar_offset = offset;
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dev_info(&dev->dev, "BAR %d: assigned to efifb\n", idx);
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}
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static void efifb_fixup_resources(struct pci_dev *dev)
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{
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u64 base = screen_info.lfb_base;
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u64 size = screen_info.lfb_size;
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int i;
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if (efifb_pci_dev || screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
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return;
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if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
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base |= (u64)screen_info.ext_lfb_base << 32;
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if (!base)
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return;
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for (i = 0; i <= PCI_STD_RESOURCE_END; i++) {
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struct resource *res = &dev->resource[i];
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if (!(res->flags & IORESOURCE_MEM))
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continue;
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if (res->start <= base && res->end >= base + size - 1) {
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record_efifb_bar_resource(dev, i, base - res->start);
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break;
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}
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}
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}
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DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_ANY_ID, PCI_ANY_ID, PCI_BASE_CLASS_DISPLAY,
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16, efifb_fixup_resources);
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#endif
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