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