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675 lines
18 KiB
675 lines
18 KiB
// 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 <[email protected]> |
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* Original efi driver written by Gerd Knorr <[email protected]> |
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* |
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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/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 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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|
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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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static void efifb_destroy(struct fb_info *info) |
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{ |
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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(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 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 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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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(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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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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|
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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; |
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mem_flags &= md.attribute; |
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} |
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} |
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if (mem_flags & EFI_MEMORY_WC) |
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info->screen_base = ioremap_wc(efifb_fix.smem_start, |
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efifb_fix.smem_len); |
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else if (mem_flags & EFI_MEMORY_UC) |
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info->screen_base = ioremap(efifb_fix.smem_start, |
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efifb_fix.smem_len); |
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else if (mem_flags & EFI_MEMORY_WT) |
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info->screen_base = memremap(efifb_fix.smem_start, |
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efifb_fix.smem_len, MEMREMAP_WT); |
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else if (mem_flags & EFI_MEMORY_WB) |
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info->screen_base = memremap(efifb_fix.smem_start, |
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efifb_fix.smem_len, MEMREMAP_WB); |
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if (!info->screen_base) { |
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pr_err("efifb: abort, cannot remap 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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efifb_show_boot_graphics(info); |
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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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|
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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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|
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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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|
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efifb_defined.red.offset = screen_info.red_pos; |
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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 | FBINFO_MISC_FIRMWARE; |
|
|
|
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; |
|
} |
|
err = register_framebuffer(info); |
|
if (err < 0) { |
|
pr_err("efifb: cannot register framebuffer\n"); |
|
goto err_fb_dealoc; |
|
} |
|
fb_info(info, "%s frame buffer device\n", info->fix.id); |
|
if (efifb_pci_dev) |
|
pm_runtime_get_sync(&efifb_pci_dev->dev); |
|
return 0; |
|
|
|
err_fb_dealoc: |
|
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 int efifb_remove(struct platform_device *pdev) |
|
{ |
|
struct fb_info *info = platform_get_drvdata(pdev); |
|
|
|
unregister_framebuffer(info); |
|
sysfs_remove_groups(&pdev->dev.kobj, efifb_groups); |
|
framebuffer_release(info); |
|
if (efifb_pci_dev) |
|
pm_runtime_put(&efifb_pci_dev->dev); |
|
|
|
return 0; |
|
} |
|
|
|
static struct platform_driver efifb_driver = { |
|
.driver = { |
|
.name = "efi-framebuffer", |
|
}, |
|
.probe = efifb_probe, |
|
.remove = 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
|
|
|