1 /* SPDX-License-Identifier: GPL-2.0-only */
2
3 #include <device/pci_ops.h>
4 #include <device/device.h>
5 #include <string.h>
6 #include <device/pci.h>
7 #include <drivers/intel/gma/opregion.h>
8
9 #include "i915.h"
10 #include "intel_bios.h"
11
generate_vbt(const struct i915_gpu_controller_info * const conf,struct vbt_header * const head,const char * const idstr)12 static size_t generate_vbt(const struct i915_gpu_controller_info *const conf,
13 struct vbt_header *const head,
14 const char *const idstr)
15 {
16 u8 *ptr;
17
18 memset(head, 0, sizeof(*head));
19
20 memset(head->signature, ' ', sizeof(head->signature));
21 memcpy(head->signature, idstr,
22 MIN(strlen(idstr), sizeof(head->signature)));
23 head->version = 100;
24 head->header_size = sizeof(*head);
25 head->bdb_offset = sizeof(*head);
26
27 struct bdb_header *const bdb_head = (struct bdb_header *)(head + 1);
28 memset(bdb_head, 0, sizeof(*bdb_head));
29 memcpy(bdb_head->signature, "BIOS_DATA_BLOCK ", 16);
30 bdb_head->version = 0xa8;
31 bdb_head->header_size = sizeof(*bdb_head);
32
33 ptr = (u8 *)(bdb_head + 1);
34
35 ptr[0] = BDB_GENERAL_FEATURES;
36 ptr[1] = sizeof(struct bdb_general_features);
37 ptr[2] = sizeof(struct bdb_general_features) >> 8;
38 ptr += 3;
39
40 struct bdb_general_features *const genfeat =
41 (struct bdb_general_features *)ptr;
42 memset(genfeat, 0, sizeof(*genfeat));
43 genfeat->panel_fitting = 3;
44 genfeat->flexaim = 1;
45 genfeat->download_ext_vbt = 1;
46 genfeat->enable_ssc = conf->use_spread_spectrum_clock;
47 genfeat->ssc_freq = CONFIG(INTEL_GMA_SSC_ALTERNATE_REF);
48 genfeat->rsvd10 = 0x4;
49 genfeat->legacy_monitor_detect = 1;
50 genfeat->int_crt_support = 1;
51 genfeat->dp_ssc_enb = 1;
52
53 ptr += sizeof(*genfeat);
54
55 bdb_head->bdb_size = ptr - (u8 *)bdb_head;
56 head->vbt_size = ptr - (u8 *)head;
57 head->vbt_checksum = 0;
58 return ptr - (u8 *)head;
59 }
60
61 void
generate_fake_intel_oprom(const struct i915_gpu_controller_info * const conf,struct device * const dev,const char * const idstr)62 generate_fake_intel_oprom(const struct i915_gpu_controller_info *const conf,
63 struct device *const dev, const char *const idstr)
64 {
65 optionrom_header_t *const oh = (void *)PCI_VGA_RAM_IMAGE_START;
66
67 memset(oh, 0, 8192);
68
69 oh->signature = PCI_ROM_HDR;
70 oh->pcir_offset = 0x40;
71 oh->vbt_offset = 0x80;
72
73 optionrom_pcir_t *const pcir = (void *)((u8 *)oh + oh->pcir_offset);
74 pcir->signature = 0x52494350; // PCIR
75 pcir->vendor = dev->vendor;
76 pcir->device = dev->device;
77 pcir->length = sizeof(*pcir);
78 pcir->revision = pci_read_config8(dev, PCI_CLASS_REVISION);
79 pcir->classcode[0] = dev->class;
80 pcir->classcode[1] = dev->class >> 8;
81 pcir->classcode[2] = dev->class >> 16;
82 pcir->indicator = 0x80;
83
84 const size_t vbt_size =
85 generate_vbt(conf, (void *)((u8 *)oh + oh->vbt_offset), idstr);
86 const size_t fake_oprom_size =
87 DIV_ROUND_UP(oh->vbt_offset + vbt_size, 512);
88 oh->size = fake_oprom_size;
89 pcir->imagelength = fake_oprom_size;
90 }
91