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 
30 enum {
31 	OVERRIDE_NONE = 0x0,
32 	OVERRIDE_BASE = 0x1,
33 	OVERRIDE_STRIDE = 0x2,
34 	OVERRIDE_HEIGHT = 0x4,
35 	OVERRIDE_WIDTH = 0x8,
36 };
37 
38 struct 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 
efifb_setup_from_dmi(struct screen_info * si,const char * opt)71 void efifb_setup_from_dmi(struct screen_info *si, const char *opt)
72 {
73 	int i;
74 
75 	for (i = 0; i < M_UNKNOWN; i++) {
76 		if (efifb_dmi_list[i].base != 0 &&
77 		    !strcmp(opt, efifb_dmi_list[i].optname)) {
78 			si->lfb_base = efifb_dmi_list[i].base;
79 			si->lfb_linelength = efifb_dmi_list[i].stride;
80 			si->lfb_width = efifb_dmi_list[i].width;
81 			si->lfb_height = efifb_dmi_list[i].height;
82 		}
83 	}
84 }
85 
86 #define choose_value(dmivalue, fwvalue, field, flags) ({	\
87 		typeof(fwvalue) _ret_ = fwvalue;		\
88 		if ((flags) & (field))				\
89 			_ret_ = dmivalue;			\
90 		else if ((fwvalue) == 0)			\
91 			_ret_ = dmivalue;			\
92 		_ret_;						\
93 	})
94 
efifb_set_system(const struct dmi_system_id * id)95 static int __init efifb_set_system(const struct dmi_system_id *id)
96 {
97 	struct efifb_dmi_info *info = id->driver_data;
98 
99 	if (info->base == 0 && info->height == 0 && info->width == 0 &&
100 	    info->stride == 0)
101 		return 0;
102 
103 	/* Trust the bootloader over the DMI tables */
104 	if (screen_info.lfb_base == 0) {
105 #if defined(CONFIG_PCI)
106 		struct pci_dev *dev = NULL;
107 		int found_bar = 0;
108 #endif
109 		if (info->base) {
110 			screen_info.lfb_base = choose_value(info->base,
111 				screen_info.lfb_base, OVERRIDE_BASE,
112 				info->flags);
113 
114 #if defined(CONFIG_PCI)
115 			/* make sure that the address in the table is actually
116 			 * on a VGA device's PCI BAR */
117 
118 			for_each_pci_dev(dev) {
119 				int i;
120 				if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
121 					continue;
122 				for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
123 					resource_size_t start, end;
124 					unsigned long flags;
125 
126 					flags = pci_resource_flags(dev, i);
127 					if (!(flags & IORESOURCE_MEM))
128 						continue;
129 
130 					if (flags & IORESOURCE_UNSET)
131 						continue;
132 
133 					if (pci_resource_len(dev, i) == 0)
134 						continue;
135 
136 					start = pci_resource_start(dev, i);
137 					end = pci_resource_end(dev, i);
138 					if (screen_info.lfb_base >= start &&
139 					    screen_info.lfb_base < end) {
140 						found_bar = 1;
141 						break;
142 					}
143 				}
144 			}
145 			if (!found_bar)
146 				screen_info.lfb_base = 0;
147 #endif
148 		}
149 	}
150 	if (screen_info.lfb_base) {
151 		screen_info.lfb_linelength = choose_value(info->stride,
152 			screen_info.lfb_linelength, OVERRIDE_STRIDE,
153 			info->flags);
154 		screen_info.lfb_width = choose_value(info->width,
155 			screen_info.lfb_width, OVERRIDE_WIDTH,
156 			info->flags);
157 		screen_info.lfb_height = choose_value(info->height,
158 			screen_info.lfb_height, OVERRIDE_HEIGHT,
159 			info->flags);
160 		if (screen_info.orig_video_isVGA == 0)
161 			screen_info.orig_video_isVGA = VIDEO_TYPE_EFI;
162 	} else {
163 		screen_info.lfb_linelength = 0;
164 		screen_info.lfb_width = 0;
165 		screen_info.lfb_height = 0;
166 		screen_info.orig_video_isVGA = 0;
167 		return 0;
168 	}
169 
170 	printk(KERN_INFO "efifb: dmi detected %s - framebuffer at 0x%08x "
171 			 "(%dx%d, stride %d)\n", id->ident,
172 			 screen_info.lfb_base, screen_info.lfb_width,
173 			 screen_info.lfb_height, screen_info.lfb_linelength);
174 
175 	return 1;
176 }
177 
178 #define EFIFB_DMI_SYSTEM_ID(vendor, name, enumid)		\
179 	{							\
180 		efifb_set_system,				\
181 		name,						\
182 		{						\
183 			DMI_MATCH(DMI_BIOS_VENDOR, vendor),	\
184 			DMI_MATCH(DMI_PRODUCT_NAME, name)	\
185 		},						\
186 		&efifb_dmi_list[enumid]				\
187 	}
188 
189 static const struct dmi_system_id efifb_dmi_system_table[] __initconst = {
190 	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac4,1", M_I17),
191 	/* At least one of these two will be right; maybe both? */
192 	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac5,1", M_I20),
193 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac5,1", M_I20),
194 	/* At least one of these two will be right; maybe both? */
195 	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "iMac6,1", M_I24),
196 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac6,1", M_I24),
197 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac7,1", M_I20_SR),
198 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac8,1", M_I24_8_1),
199 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac10,1", M_I24_10_1),
200 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "iMac11,1", M_I27_11_1),
201 	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "Macmini1,1", M_MINI),
202 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "Macmini3,1", M_MINI_3_1),
203 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "Macmini4,1", M_MINI_4_1),
204 	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook1,1", M_MB),
205 	/* At least one of these two will be right; maybe both? */
206 	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook2,1", M_MB),
207 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook2,1", M_MB),
208 	/* At least one of these two will be right; maybe both? */
209 	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBook3,1", M_MB),
210 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook3,1", M_MB),
211 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook4,1", M_MB),
212 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook5,1", M_MB_5_1),
213 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook6,1", M_MB_6_1),
214 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBook7,1", M_MB_7_1),
215 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookAir1,1", M_MBA),
216 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookAir3,1", M_MBA_3),
217 	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro1,1", M_MBP),
218 	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro2,1", M_MBP_2),
219 	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro2,2", M_MBP_2_2),
220 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro2,1", M_MBP_2),
221 	EFIFB_DMI_SYSTEM_ID("Apple Computer, Inc.", "MacBookPro3,1", M_MBP_SR),
222 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro3,1", M_MBP_SR),
223 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro4,1", M_MBP_4),
224 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro5,1", M_MBP_5_1),
225 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro5,2", M_MBP_5_2),
226 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro5,3", M_MBP_5_3),
227 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro6,1", M_MBP_6_1),
228 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro6,2", M_MBP_6_2),
229 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro7,1", M_MBP_7_1),
230 	EFIFB_DMI_SYSTEM_ID("Apple Inc.", "MacBookPro8,2", M_MBP_8_2),
231 	{},
232 };
233 
sysfb_apply_efi_quirks(void)234 __init void sysfb_apply_efi_quirks(void)
235 {
236 	if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI ||
237 	    !(screen_info.capabilities & VIDEO_CAPABILITY_SKIP_QUIRKS))
238 		dmi_check_system(efifb_dmi_system_table);
239 }
240