1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (c) 2013-2015, NVIDIA CORPORATION.  All rights reserved.
4  */
5 
6 #include <linux/device.h>
7 #include <linux/kernel.h>
8 #include <linux/bug.h>
9 
10 #include <soc/tegra/fuse.h>
11 
12 #include "fuse.h"
13 
14 #define CPU_PROCESS_CORNERS	2
15 #define GPU_PROCESS_CORNERS	2
16 #define SOC_PROCESS_CORNERS	3
17 
18 #define FUSE_CPU_SPEEDO_0	0x014
19 #define FUSE_CPU_SPEEDO_1	0x02c
20 #define FUSE_CPU_SPEEDO_2	0x030
21 #define FUSE_SOC_SPEEDO_0	0x034
22 #define FUSE_SOC_SPEEDO_1	0x038
23 #define FUSE_SOC_SPEEDO_2	0x03c
24 #define FUSE_CPU_IDDQ		0x018
25 #define FUSE_SOC_IDDQ		0x040
26 #define FUSE_GPU_IDDQ		0x128
27 #define FUSE_FT_REV		0x028
28 
29 enum {
30 	THRESHOLD_INDEX_0,
31 	THRESHOLD_INDEX_1,
32 	THRESHOLD_INDEX_COUNT,
33 };
34 
35 static const u32 __initconst cpu_process_speedos[][CPU_PROCESS_CORNERS] = {
36 	{ 2119, UINT_MAX },
37 	{ 2119, UINT_MAX },
38 };
39 
40 static const u32 __initconst gpu_process_speedos[][GPU_PROCESS_CORNERS] = {
41 	{ UINT_MAX, UINT_MAX },
42 	{ UINT_MAX, UINT_MAX },
43 };
44 
45 static const u32 __initconst soc_process_speedos[][SOC_PROCESS_CORNERS] = {
46 	{ 1950, 2100, UINT_MAX },
47 	{ 1950, 2100, UINT_MAX },
48 };
49 
50 static u8 __init get_speedo_revision(void)
51 {
52 	return tegra_fuse_read_spare(4) << 2 |
53 	       tegra_fuse_read_spare(3) << 1 |
54 	       tegra_fuse_read_spare(2) << 0;
55 }
56 
57 static void __init rev_sku_to_speedo_ids(struct tegra_sku_info *sku_info,
58 					 u8 speedo_rev, int *threshold)
59 {
60 	int sku = sku_info->sku_id;
61 
62 	/* Assign to default */
63 	sku_info->cpu_speedo_id = 0;
64 	sku_info->soc_speedo_id = 0;
65 	sku_info->gpu_speedo_id = 0;
66 	*threshold = THRESHOLD_INDEX_0;
67 
68 	switch (sku) {
69 	case 0x00: /* Engineering SKU */
70 	case 0x01: /* Engineering SKU */
71 	case 0x07:
72 	case 0x17:
73 	case 0x27:
74 		if (speedo_rev >= 2)
75 			sku_info->gpu_speedo_id = 1;
76 		break;
77 
78 	case 0x13:
79 		if (speedo_rev >= 2)
80 			sku_info->gpu_speedo_id = 1;
81 
82 		sku_info->cpu_speedo_id = 1;
83 		break;
84 
85 	default:
86 		pr_err("Tegra210: unknown SKU %#04x\n", sku);
87 		/* Using the default for the error case */
88 		break;
89 	}
90 }
91 
92 static int get_process_id(int value, const u32 *speedos, unsigned int num)
93 {
94 	unsigned int i;
95 
96 	for (i = 0; i < num; i++)
97 		if (value < speedos[i])
98 			return i;
99 
100 	return -EINVAL;
101 }
102 
103 void __init tegra210_init_speedo_data(struct tegra_sku_info *sku_info)
104 {
105 	int cpu_speedo[3], soc_speedo[3];
106 	unsigned int index;
107 	u8 speedo_revision;
108 
109 	BUILD_BUG_ON(ARRAY_SIZE(cpu_process_speedos) !=
110 			THRESHOLD_INDEX_COUNT);
111 	BUILD_BUG_ON(ARRAY_SIZE(gpu_process_speedos) !=
112 			THRESHOLD_INDEX_COUNT);
113 	BUILD_BUG_ON(ARRAY_SIZE(soc_process_speedos) !=
114 			THRESHOLD_INDEX_COUNT);
115 
116 	/* Read speedo/IDDQ fuses */
117 	cpu_speedo[0] = tegra_fuse_read_early(FUSE_CPU_SPEEDO_0);
118 	cpu_speedo[1] = tegra_fuse_read_early(FUSE_CPU_SPEEDO_1);
119 	cpu_speedo[2] = tegra_fuse_read_early(FUSE_CPU_SPEEDO_2);
120 
121 	soc_speedo[0] = tegra_fuse_read_early(FUSE_SOC_SPEEDO_0);
122 	soc_speedo[1] = tegra_fuse_read_early(FUSE_SOC_SPEEDO_1);
123 	soc_speedo[2] = tegra_fuse_read_early(FUSE_SOC_SPEEDO_2);
124 
125 	/*
126 	 * Determine CPU, GPU and SoC speedo values depending on speedo fusing
127 	 * revision. Note that GPU speedo value is fused in CPU_SPEEDO_2.
128 	 */
129 	speedo_revision = get_speedo_revision();
130 	pr_info("Speedo Revision %u\n", speedo_revision);
131 
132 	if (speedo_revision >= 3) {
133 		sku_info->cpu_speedo_value = cpu_speedo[0];
134 		sku_info->gpu_speedo_value = cpu_speedo[2];
135 		sku_info->soc_speedo_value = soc_speedo[0];
136 	} else if (speedo_revision == 2) {
137 		sku_info->cpu_speedo_value = (-1938 + (1095 * cpu_speedo[0] / 100)) / 10;
138 		sku_info->gpu_speedo_value = (-1662 + (1082 * cpu_speedo[2] / 100)) / 10;
139 		sku_info->soc_speedo_value = ( -705 + (1037 * soc_speedo[0] / 100)) / 10;
140 	} else {
141 		sku_info->cpu_speedo_value = 2100;
142 		sku_info->gpu_speedo_value = cpu_speedo[2] - 75;
143 		sku_info->soc_speedo_value = 1900;
144 	}
145 
146 	if ((sku_info->cpu_speedo_value <= 0) ||
147 	    (sku_info->gpu_speedo_value <= 0) ||
148 	    (sku_info->soc_speedo_value <= 0)) {
149 		WARN(1, "speedo value not fused\n");
150 		return;
151 	}
152 
153 	rev_sku_to_speedo_ids(sku_info, speedo_revision, &index);
154 
155 	sku_info->gpu_process_id = get_process_id(sku_info->gpu_speedo_value,
156 						  gpu_process_speedos[index],
157 						  GPU_PROCESS_CORNERS);
158 
159 	sku_info->cpu_process_id = get_process_id(sku_info->cpu_speedo_value,
160 						  cpu_process_speedos[index],
161 						  CPU_PROCESS_CORNERS);
162 
163 	sku_info->soc_process_id = get_process_id(sku_info->soc_speedo_value,
164 						  soc_process_speedos[index],
165 						  SOC_PROCESS_CORNERS);
166 
167 	pr_debug("Tegra GPU Speedo ID=%d, Speedo Value=%d\n",
168 		 sku_info->gpu_speedo_id, sku_info->gpu_speedo_value);
169 }
170