1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * soc-intel-quirks.h - prototypes for quirk autodetection
4 *
5 * Copyright (c) 2019, Intel Corporation.
6 *
7 */
8
9 #ifndef _SND_SOC_INTEL_QUIRKS_H
10 #define _SND_SOC_INTEL_QUIRKS_H
11
12 #include <linux/platform_data/x86/soc.h>
13
14 #if IS_REACHABLE(CONFIG_IOSF_MBI)
15
16 #include <linux/dmi.h>
17 #include <asm/iosf_mbi.h>
18
19 static inline bool soc_intel_is_byt_cr(struct platform_device *pdev)
20 {
21 /*
22 * List of systems which:
23 * 1. Use a non CR version of the Bay Trail SoC
24 * 2. Contain at least 6 interrupt resources so that the
25 * platform_get_resource(pdev, IORESOURCE_IRQ, 5) check below
26 * succeeds
27 * 3. Despite 1. and 2. still have their IPC IRQ at index 0 rather then 5
28 *
29 * This needs to be here so that it can be shared between the SST and
30 * SOF drivers. We rely on the compiler to optimize this out in files
31 * where soc_intel_is_byt_cr is not used.
32 */
33 static const struct dmi_system_id force_bytcr_table[] = {
34 { /* Lenovo Yoga Tablet 2 series */
35 .matches = {
36 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
37 DMI_MATCH(DMI_PRODUCT_FAMILY, "YOGATablet2"),
38 },
39 },
40 {}
41 };
42 struct device *dev = &pdev->dev;
43 int status = 0;
44
45 if (!soc_intel_is_byt())
46 return false;
47
48 if (dmi_check_system(force_bytcr_table))
49 return true;
50
51 if (iosf_mbi_available()) {
52 u32 bios_status;
53
54 status = iosf_mbi_read(BT_MBI_UNIT_PMC, /* 0x04 PUNIT */
55 MBI_REG_READ, /* 0x10 */
56 0x006, /* BIOS_CONFIG */
57 &bios_status);
58
59 if (status) {
60 dev_err(dev, "could not read PUNIT BIOS_CONFIG\n");
61 } else {
62 /* bits 26:27 mirror PMIC options */
63 bios_status = (bios_status >> 26) & 3;
64
65 if (bios_status == 1 || bios_status == 3) {
66 dev_info(dev, "Detected Baytrail-CR platform\n");
67 return true;
68 }
69
70 dev_info(dev, "BYT-CR not detected\n");
71 }
72 } else {
73 dev_info(dev, "IOSF_MBI not available, no BYT-CR detection\n");
74 }
75
76 if (!platform_get_resource(pdev, IORESOURCE_IRQ, 5)) {
77 /*
78 * Some devices detected as BYT-T have only a single IRQ listed,
79 * causing platform_get_irq with index 5 to return -ENXIO.
80 * The correct IRQ in this case is at index 0, as on BYT-CR.
81 */
82 dev_info(dev, "Falling back to Baytrail-CR platform\n");
83 return true;
84 }
85
86 return false;
87 }
88
89 #else
90
91 static inline bool soc_intel_is_byt_cr(struct platform_device *pdev)
92 {
93 return false;
94 }
95
96 #endif
97
98 #endif /* _SND_SOC_INTEL_QUIRKS_H */
99
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