linux/arch/x86/kernel/sysfb_efi.c
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   1/*
   2 * Generic System Framebuffers on x86
   3 * Copyright (c) 2012-2013 David Herrmann <dh.herrmann@gmail.com>
   4 *
   5 * EFI Quirks Copyright (c) 2006 Edgar Hucek <gimli@dark-green.com>
   6 *
   7 * This program is free software; you can redistribute it and/or modify it
   8 * under the terms of the GNU General Public License as published by the Free
   9 * Software Foundation; either version 2 of the License, or (at your option)
  10 * any later version.
  11 */
  12
  13/*
  14 * EFI Quirks
  15 * Several EFI systems do not correctly advertise their boot framebuffers.
  16 * Hence, we use this static table of known broken machines and fix up the
  17 * information so framebuffer drivers can load corectly.
  18 */
  19
  20#include <linux/dmi.h>
  21#include <linux/err.h>
  22#include <linux/init.h>
  23#include <linux/kernel.h>
  24#include <linux/mm.h>
  25#include <linux/pci.h>
  26#include <linux/screen_info.h>
  27#include <video/vga.h>
  28#include <asm/sysfb.h>
  29
  30enum {
  31        OVERRIDE_NONE = 0x0,
  32        OVERRIDE_BASE = 0x1,
  33        OVERRIDE_STRIDE = 0x2,
  34        OVERRIDE_HEIGHT = 0x4,
  35        OVERRIDE_WIDTH = 0x8,
  36};
  37
  38struct efifb_dmi_info efifb_dmi_list[] = {
  39        [M_I17] = { "i17", 0x80010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
  40        [M_I20] = { "i20", 0x80010000, 1728 * 4, 1680, 1050, OVERRIDE_NONE }, /* guess */
  41        [M_I20_SR] = { "imac7", 0x40010000, 1728 * 4, 1680, 1050, OVERRIDE_NONE },
  42        [M_I24] = { "i24", 0x80010000, 2048 * 4, 1920, 1200, OVERRIDE_NONE }, /* guess */
  43        [M_I24_8_1] = { "imac8", 0xc0060000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
  44        [M_I24_10_1] = { "imac10", 0xc0010000, 2048 * 4, 1920, 1080, OVERRIDE_NONE },
  45        [M_I27_11_1] = { "imac11", 0xc0010000, 2560 * 4, 2560, 1440, OVERRIDE_NONE },
  46        [M_MINI]= { "mini", 0x80000000, 2048 * 4, 1024, 768, OVERRIDE_NONE },
  47        [M_MINI_3_1] = { "mini31", 0x40010000, 1024 * 4, 1024, 768, OVERRIDE_NONE },
  48        [M_MINI_4_1] = { "mini41", 0xc0010000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
  49        [M_MB] = { "macbook", 0x80000000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
  50        [M_MB_5_1] = { "macbook51", 0x80010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
  51        [M_MB_6_1] = { "macbook61", 0x80010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
  52        [M_MB_7_1] = { "macbook71", 0x80010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
  53        [M_MBA] = { "mba", 0x80000000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
  54        /* 11" Macbook Air 3,1 passes the wrong stride */
  55        [M_MBA_3] = { "mba3", 0, 2048 * 4, 0, 0, OVERRIDE_STRIDE },
  56        [M_MBP] = { "mbp", 0x80010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
  57        [M_MBP_2] = { "mbp2", 0, 0, 0, 0, OVERRIDE_NONE }, /* placeholder */
  58        [M_MBP_2_2] = { "mbp22", 0x80010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
  59        [M_MBP_SR] = { "mbp3", 0x80030000, 2048 * 4, 1440, 900, OVERRIDE_NONE },
  60        [M_MBP_4] = { "mbp4", 0xc0060000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
  61        [M_MBP_5_1] = { "mbp51", 0xc0010000, 2048 * 4, 1440, 900, OVERRIDE_NONE },
  62        [M_MBP_5_2] = { "mbp52", 0xc0010000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
  63        [M_MBP_5_3] = { "mbp53", 0xd0010000, 2048 * 4, 1440, 900, OVERRIDE_NONE },
  64        [M_MBP_6_1] = { "mbp61", 0x90030000, 2048 * 4, 1920, 1200, OVERRIDE_NONE },
  65        [M_MBP_6_2] = { "mbp62", 0x90030000, 2048 * 4, 1680, 1050, OVERRIDE_NONE },
  66        [M_MBP_7_1] = { "mbp71", 0xc0010000, 2048 * 4, 1280, 800, OVERRIDE_NONE },
  67        [M_MBP_8_2] = { "mbp82", 0x90010000, 1472 * 4, 1440, 900, OVERRIDE_NONE },
  68        [M_UNKNOWN] = { NULL, 0, 0, 0, 0, OVERRIDE_NONE }
  69};
  70
  71#define choose_value(dmivalue, fwvalue, field, flags) ({        \
  72                typeof(fwvalue) _ret_ = fwvalue;                \
  73                if ((flags) & (field))                          \
  74                        _ret_ = dmivalue;                       \
  75                else if ((fwvalue) == 0)                        \
  76                        _ret_ = dmivalue;                       \
  77                _ret_;                                          \
  78        })
  79
  80static int __init efifb_set_system(const struct dmi_system_id *id)
  81{
  82        struct efifb_dmi_info *info = id->driver_data;
  83
  84        if (info->base == 0 && info->height == 0 && info->width == 0 &&
  85            info->stride == 0)
  86                return 0;
  87
  88        /* Trust the bootloader over the DMI tables */
  89        if (screen_info.lfb_base == 0) {
  90#if defined(CONFIG_PCI)
  91                struct pci_dev *dev = NULL;
  92                int found_bar = 0;
  93#endif
  94                if (info->base) {
  95                        screen_info.lfb_base = choose_value(info->base,
  96                                screen_info.lfb_base, OVERRIDE_BASE,
  97                                info->flags);
  98
  99#if defined(CONFIG_PCI)
 100                        /* make sure that the address in the table is actually
 101                         * on a VGA device's PCI BAR */
 102
 103                        for_each_pci_dev(dev) {
 104                                int i;
 105                                if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
 106                                        continue;
 107                                for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
 108                                        resource_size_t start, end;
 109
 110                                        start = pci_resource_start(dev, i);
 111                                        if (start == 0)
 112                                                break;
 113                                        end = pci_resource_end(dev, i);
 114                                        if (screen_info.lfb_base >= start &&
 115                                            screen_info.lfb_base < end) {
 116                                                found_bar = 1;
 117                                        }
 118                                }
 119                        }
 120                        if (!found_bar)
 121                                screen_info.lfb_base = 0;
 122#endif
 123                }
 124        }
 125        if (screen_info.lfb_base) {
 126                screen_info.lfb_linelength = choose_value(info->stride,
 127                        screen_info.lfb_linelength, OVERRIDE_STRIDE,
 128                        info->flags);
 129                screen_info.lfb_width = choose_value(info->width,
 130                        screen_info.lfb_width, OVERRIDE_WIDTH,
 131                        info->flags);
 132                screen_info.lfb_height = choose_value(info->height,
 133                        screen_info.lfb_height, OVERRIDE_HEIGHT,
 134                        info->flags);
 135                if (screen_info.orig_video_isVGA == 0)
 136                        screen_info.orig_video_isVGA = VIDEO_TYPE_EFI;
 137        } else {
 138                screen_info.lfb_linelength = 0;
 139                screen_info.lfb_width = 0;
 140                screen_info.lfb_height = 0;
 141                screen_info.orig_video_isVGA = 0;
 142                return 0;
 143        }
 144
 145        printk(KERN_INFO "efifb: dmi detected %s - framebuffer at 0x%08x "
 146                         "(%dx%d, stride %d)\n", id->ident,
 147                         screen_info.lfb_base, screen_info.lfb_width,
 148                         screen_info.lfb_height, screen_info.lfb_linelength);
 149
 150        return 1;
 151}
 152
 153#define EFIFB_DMI_SYSTEM_ID(vendor, name, enumid)               \
 154        {                                                       \
 155                efifb_set_system,                               \
 156                name,                                           \
 157                {                                               \
 158                        DMI_MATCH(DMI_BIOS_VENDOR, vendor),     \
 159                        DMI_MATCH(DMI_PRODUCT_NAME, name)       \
 160                },                                              \
 161                &efifb_dmi_list[enumid]                         \
 162        }
 163
 164static const struct dmi_system_id efifb_dmi_system_table[] __initconst = {
 165        EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac4,1", M_I17),
 166        /* At least one of these two will be right; maybe both? */
 167        EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac5,1", M_I20),
 168        EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac5,1", M_I20),
 169        /* At least one of these two will be right; maybe both? */
 170        EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac6,1", M_I24),
 171        EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac6,1", M_I24),
 172        EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac7,1", M_I20_SR),
 173        EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac8,1", M_I24_8_1),
 174        EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac10,1", M_I24_10_1),
 175        EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac11,1", M_I27_11_1),
 176        EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "Macmini1,1", M_MINI),
 177        EFIFB_DMI_SYSTEM_ID("Apple Inc.", "Macmini3,1", M_MINI_3_1),
 178        EFIFB_DMI_SYSTEM_ID("Apple Inc.", "Macmini4,1", M_MINI_4_1),
 179        EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook1,1", M_MB),
 180        /* At least one of these two will be right; maybe both? */
 181        EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook2,1", M_MB),
 182        EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook2,1", M_MB),
 183        /* At least one of these two will be right; maybe both? */
 184        EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook3,1", M_MB),
 185        EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook3,1", M_MB),
 186        EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook4,1", M_MB),
 187        EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook5,1", M_MB_5_1),
 188        EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook6,1", M_MB_6_1),
 189        EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook7,1", M_MB_7_1),
 190        EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookAir1,1", M_MBA),
 191        EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookAir3,1", M_MBA_3),
 192        EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro1,1", M_MBP),
 193        EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro2,1", M_MBP_2),
 194        EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro2,2", M_MBP_2_2),
 195        EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro2,1", M_MBP_2),
 196        EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro3,1", M_MBP_SR),
 197        EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro3,1", M_MBP_SR),
 198        EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro4,1", M_MBP_4),
 199        EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro5,1", M_MBP_5_1),
 200        EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro5,2", M_MBP_5_2),
 201        EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro5,3", M_MBP_5_3),
 202        EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro6,1", M_MBP_6_1),
 203        EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro6,2", M_MBP_6_2),
 204        EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro7,1", M_MBP_7_1),
 205        EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro8,2", M_MBP_8_2),
 206        {},
 207};
 208
 209__init void sysfb_apply_efi_quirks(void)
 210{
 211        if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI ||
 212            !(screen_info.capabilities & VIDEO_CAPABILITY_SKIP_QUIRKS))
 213                dmi_check_system(efifb_dmi_system_table);
 214}
 215
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