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_ENABLED(CONFIG_X86)
15
16#include <linux/dmi.h>
17#include <asm/iosf_mbi.h>
18
19static 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
91static 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