697 lines
19 KiB
C
697 lines
19 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/aperture.h>
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#include <linux/kernel.h>
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#include <linux/efi.h>
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#include <linux/efi-bgrt.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/printk.h>
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#include <linux/screen_info.h>
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#include <linux/pm_runtime.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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struct bmp_file_header {
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u16 id;
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u32 file_size;
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u32 reserved;
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u32 bitmap_offset;
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} __packed;
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struct bmp_dib_header {
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u32 dib_header_size;
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s32 width;
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s32 height;
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u16 planes;
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u16 bpp;
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u32 compression;
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u32 bitmap_size;
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u32 horz_resolution;
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u32 vert_resolution;
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u32 colors_used;
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u32 colors_important;
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} __packed;
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static bool use_bgrt = true;
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static bool request_mem_succeeded = false;
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static u64 mem_flags = EFI_MEMORY_WC | EFI_MEMORY_UC;
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static struct pci_dev *efifb_pci_dev; /* dev with BAR covering the efifb */
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struct efifb_par {
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u32 pseudo_palette[16];
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resource_size_t base;
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resource_size_t size;
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};
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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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/*
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* If fbcon deffered console takeover is configured, the intent is for the
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* framebuffer to show the boot graphics (e.g. vendor logo) until there is some
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* (error) message to display. But the boot graphics may have been destroyed by
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* e.g. option ROM output, detect this and restore the boot graphics.
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*/
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#if defined CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER && \
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defined CONFIG_ACPI_BGRT
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static void efifb_copy_bmp(u8 *src, u32 *dst, int width, struct screen_info *si)
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{
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u8 r, g, b;
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while (width--) {
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b = *src++;
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g = *src++;
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r = *src++;
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*dst++ = (r << si->red_pos) |
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(g << si->green_pos) |
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(b << si->blue_pos);
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}
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}
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#ifdef CONFIG_X86
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/*
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* On x86 some firmwares use a low non native resolution for the display when
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* they have shown some text messages. While keeping the bgrt filled with info
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* for the native resolution. If the bgrt image intended for the native
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* resolution still fits, it will be displayed very close to the right edge of
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* the display looking quite bad. This function checks for this.
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*/
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static bool efifb_bgrt_sanity_check(struct screen_info *si, u32 bmp_width)
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{
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/*
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* All x86 firmwares horizontally center the image (the yoffset
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* calculations differ between boards, but xoffset is predictable).
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*/
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u32 expected_xoffset = (si->lfb_width - bmp_width) / 2;
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return bgrt_tab.image_offset_x == expected_xoffset;
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}
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#else
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static bool efifb_bgrt_sanity_check(struct screen_info *si, u32 bmp_width)
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{
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return true;
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}
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#endif
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static void efifb_show_boot_graphics(struct fb_info *info)
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{
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u32 bmp_width, bmp_height, bmp_pitch, dst_x, y, src_y;
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struct screen_info *si = &screen_info;
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struct bmp_file_header *file_header;
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struct bmp_dib_header *dib_header;
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void *bgrt_image = NULL;
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u8 *dst = info->screen_base;
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if (!use_bgrt)
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return;
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if (!bgrt_tab.image_address) {
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pr_info("efifb: No BGRT, not showing boot graphics\n");
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return;
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}
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if (bgrt_tab.status & 0x06) {
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pr_info("efifb: BGRT rotation bits set, not showing boot graphics\n");
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return;
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}
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/* Avoid flashing the logo if we're going to print std probe messages */
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if (console_loglevel > CONSOLE_LOGLEVEL_QUIET)
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return;
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/* bgrt_tab.status is unreliable, so we don't check it */
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if (si->lfb_depth != 32) {
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pr_info("efifb: not 32 bits, not showing boot graphics\n");
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return;
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}
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bgrt_image = memremap(bgrt_tab.image_address, bgrt_image_size,
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MEMREMAP_WB);
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if (!bgrt_image) {
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pr_warn("efifb: Ignoring BGRT: failed to map image memory\n");
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return;
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}
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if (bgrt_image_size < (sizeof(*file_header) + sizeof(*dib_header)))
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goto error;
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file_header = bgrt_image;
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if (file_header->id != 0x4d42 || file_header->reserved != 0)
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goto error;
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dib_header = bgrt_image + sizeof(*file_header);
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if (dib_header->dib_header_size != 40 || dib_header->width < 0 ||
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dib_header->planes != 1 || dib_header->bpp != 24 ||
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dib_header->compression != 0)
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goto error;
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bmp_width = dib_header->width;
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bmp_height = abs(dib_header->height);
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bmp_pitch = round_up(3 * bmp_width, 4);
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if ((file_header->bitmap_offset + bmp_pitch * bmp_height) >
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bgrt_image_size)
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goto error;
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if ((bgrt_tab.image_offset_x + bmp_width) > si->lfb_width ||
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(bgrt_tab.image_offset_y + bmp_height) > si->lfb_height)
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goto error;
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if (!efifb_bgrt_sanity_check(si, bmp_width))
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goto error;
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pr_info("efifb: showing boot graphics\n");
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for (y = 0; y < si->lfb_height; y++, dst += si->lfb_linelength) {
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/* Only background? */
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if (y < bgrt_tab.image_offset_y ||
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y >= (bgrt_tab.image_offset_y + bmp_height)) {
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memset(dst, 0, 4 * si->lfb_width);
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continue;
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}
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src_y = y - bgrt_tab.image_offset_y;
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/* Positive header height means upside down row order */
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if (dib_header->height > 0)
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src_y = (bmp_height - 1) - src_y;
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memset(dst, 0, bgrt_tab.image_offset_x * 4);
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dst_x = bgrt_tab.image_offset_x;
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efifb_copy_bmp(bgrt_image + file_header->bitmap_offset +
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src_y * bmp_pitch,
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(u32 *)dst + dst_x, bmp_width, si);
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dst_x += bmp_width;
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memset((u32 *)dst + dst_x, 0, (si->lfb_width - dst_x) * 4);
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}
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memunmap(bgrt_image);
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return;
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error:
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memunmap(bgrt_image);
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pr_warn("efifb: Ignoring BGRT: unexpected or invalid BMP data\n");
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}
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#else
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static inline void efifb_show_boot_graphics(struct fb_info *info) {}
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#endif
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/*
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* fb_ops.fb_destroy is called by the last put_fb_info() call at the end
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* of unregister_framebuffer() or fb_release(). Do any cleanup here.
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*/
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static void efifb_destroy(struct fb_info *info)
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{
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struct efifb_par *par = info->par;
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if (efifb_pci_dev)
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pm_runtime_put(&efifb_pci_dev->dev);
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if (info->screen_base) {
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if (mem_flags & (EFI_MEMORY_UC | EFI_MEMORY_WC))
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iounmap(info->screen_base);
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else
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memunmap(info->screen_base);
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}
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if (request_mem_succeeded)
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release_mem_region(par->base, par->size);
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fb_dealloc_cmap(&info->cmap);
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framebuffer_release(info);
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}
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static const 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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mem_flags &= ~EFI_MEMORY_WC;
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else if (!strcmp(this_opt, "nobgrt"))
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use_bgrt = false;
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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 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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struct efifb_par *par;
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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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efi_memory_desc_t md;
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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(*par), &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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platform_set_drvdata(dev, info);
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par = info->par;
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info->pseudo_palette = par->pseudo_palette;
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par->base = efifb_fix.smem_start;
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par->size = size_remap;
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if (efi_enabled(EFI_MEMMAP) &&
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!efi_mem_desc_lookup(efifb_fix.smem_start, &md)) {
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if ((efifb_fix.smem_start + efifb_fix.smem_len) >
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(md.phys_addr + (md.num_pages << EFI_PAGE_SHIFT))) {
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pr_err("efifb: video memory @ 0x%lx spans multiple EFI memory regions\n",
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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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/*
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* If the UEFI memory map covers the efifb region, we may only
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* remap it using the attributes the memory map prescribes.
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*/
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md.attribute &= EFI_MEMORY_UC | EFI_MEMORY_WC |
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EFI_MEMORY_WT | EFI_MEMORY_WB;
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if (md.attribute) {
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|
mem_flags |= EFI_MEMORY_WT | EFI_MEMORY_WB;
|
|
mem_flags &= md.attribute;
|
|
}
|
|
}
|
|
if (mem_flags & EFI_MEMORY_WC)
|
|
info->screen_base = ioremap_wc(efifb_fix.smem_start,
|
|
efifb_fix.smem_len);
|
|
else if (mem_flags & EFI_MEMORY_UC)
|
|
info->screen_base = ioremap(efifb_fix.smem_start,
|
|
efifb_fix.smem_len);
|
|
else if (mem_flags & EFI_MEMORY_WT)
|
|
info->screen_base = memremap(efifb_fix.smem_start,
|
|
efifb_fix.smem_len, MEMREMAP_WT);
|
|
else if (mem_flags & EFI_MEMORY_WB)
|
|
info->screen_base = memremap(efifb_fix.smem_start,
|
|
efifb_fix.smem_len, MEMREMAP_WB);
|
|
if (!info->screen_base) {
|
|
pr_err("efifb: abort, cannot remap video memory 0x%x @ 0x%lx\n",
|
|
efifb_fix.smem_len, efifb_fix.smem_start);
|
|
err = -EIO;
|
|
goto err_release_fb;
|
|
}
|
|
|
|
efifb_show_boot_graphics(info);
|
|
|
|
pr_info("efifb: framebuffer at 0x%lx, using %dk, total %dk\n",
|
|
efifb_fix.smem_start, size_remap/1024, size_total/1024);
|
|
pr_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;
|
|
pr_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;
|
|
|
|
pr_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;
|
|
|
|
orientation = drm_get_panel_orientation_quirk(efifb_defined.xres,
|
|
efifb_defined.yres);
|
|
switch (orientation) {
|
|
default:
|
|
info->fbcon_rotate_hint = FB_ROTATE_UR;
|
|
break;
|
|
case DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP:
|
|
info->fbcon_rotate_hint = FB_ROTATE_UD;
|
|
break;
|
|
case DRM_MODE_PANEL_ORIENTATION_LEFT_UP:
|
|
info->fbcon_rotate_hint = FB_ROTATE_CCW;
|
|
break;
|
|
case DRM_MODE_PANEL_ORIENTATION_RIGHT_UP:
|
|
info->fbcon_rotate_hint = FB_ROTATE_CW;
|
|
break;
|
|
}
|
|
|
|
err = sysfs_create_groups(&dev->dev.kobj, efifb_groups);
|
|
if (err) {
|
|
pr_err("efifb: cannot add sysfs attrs\n");
|
|
goto err_unmap;
|
|
}
|
|
err = fb_alloc_cmap(&info->cmap, 256, 0);
|
|
if (err < 0) {
|
|
pr_err("efifb: cannot allocate colormap\n");
|
|
goto err_groups;
|
|
}
|
|
|
|
if (efifb_pci_dev)
|
|
WARN_ON(pm_runtime_get_sync(&efifb_pci_dev->dev) < 0);
|
|
|
|
err = devm_aperture_acquire_for_platform_device(dev, par->base, par->size);
|
|
if (err) {
|
|
pr_err("efifb: cannot acquire aperture\n");
|
|
goto err_put_rpm_ref;
|
|
}
|
|
err = register_framebuffer(info);
|
|
if (err < 0) {
|
|
pr_err("efifb: cannot register framebuffer\n");
|
|
goto err_put_rpm_ref;
|
|
}
|
|
fb_info(info, "%s frame buffer device\n", info->fix.id);
|
|
return 0;
|
|
|
|
err_put_rpm_ref:
|
|
if (efifb_pci_dev)
|
|
pm_runtime_put(&efifb_pci_dev->dev);
|
|
|
|
fb_dealloc_cmap(&info->cmap);
|
|
err_groups:
|
|
sysfs_remove_groups(&dev->dev.kobj, efifb_groups);
|
|
err_unmap:
|
|
if (mem_flags & (EFI_MEMORY_UC | EFI_MEMORY_WC))
|
|
iounmap(info->screen_base);
|
|
else
|
|
memunmap(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 void efifb_remove(struct platform_device *pdev)
|
|
{
|
|
struct fb_info *info = platform_get_drvdata(pdev);
|
|
|
|
/* efifb_destroy takes care of info cleanup */
|
|
unregister_framebuffer(info);
|
|
sysfs_remove_groups(&pdev->dev.kobj, efifb_groups);
|
|
}
|
|
|
|
static struct platform_driver efifb_driver = {
|
|
.driver = {
|
|
.name = "efi-framebuffer",
|
|
},
|
|
.probe = efifb_probe,
|
|
.remove_new = efifb_remove,
|
|
};
|
|
|
|
builtin_platform_driver(efifb_driver);
|
|
|
|
#if defined(CONFIG_PCI)
|
|
|
|
static void record_efifb_bar_resource(struct pci_dev *dev, int idx, u64 offset)
|
|
{
|
|
u16 word;
|
|
|
|
efifb_pci_dev = dev;
|
|
|
|
pci_read_config_word(dev, PCI_COMMAND, &word);
|
|
if (!(word & PCI_COMMAND_MEMORY)) {
|
|
pci_dev_disabled = true;
|
|
dev_err(&dev->dev,
|
|
"BAR %d: assigned to efifb but device is disabled!\n",
|
|
idx);
|
|
return;
|
|
}
|
|
|
|
bar_resource = &dev->resource[idx];
|
|
bar_offset = offset;
|
|
|
|
dev_info(&dev->dev, "BAR %d: assigned to efifb\n", idx);
|
|
}
|
|
|
|
static void efifb_fixup_resources(struct pci_dev *dev)
|
|
{
|
|
u64 base = screen_info.lfb_base;
|
|
u64 size = screen_info.lfb_size;
|
|
int i;
|
|
|
|
if (efifb_pci_dev || screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
|
|
return;
|
|
|
|
if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
|
|
base |= (u64)screen_info.ext_lfb_base << 32;
|
|
|
|
if (!base)
|
|
return;
|
|
|
|
for (i = 0; i < PCI_STD_NUM_BARS; i++) {
|
|
struct resource *res = &dev->resource[i];
|
|
|
|
if (!(res->flags & IORESOURCE_MEM))
|
|
continue;
|
|
|
|
if (res->start <= base && res->end >= base + size - 1) {
|
|
record_efifb_bar_resource(dev, i, base - res->start);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_ANY_ID, PCI_ANY_ID, PCI_BASE_CLASS_DISPLAY,
|
|
16, efifb_fixup_resources);
|
|
|
|
#endif
|