1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (c) 2012-2014, NVIDIA CORPORATION.  All rights reserved.
4  */
5 
6 #include <linux/bug.h>
7 #include <linux/device.h>
8 #include <linux/kernel.h>
9 
10 #include <soc/tegra/fuse.h>
11 
12 #include "fuse.h"
13 
14 #define CPU_SPEEDO_LSBIT		20
15 #define CPU_SPEEDO_MSBIT		29
16 #define CPU_SPEEDO_REDUND_LSBIT		30
17 #define CPU_SPEEDO_REDUND_MSBIT		39
18 #define CPU_SPEEDO_REDUND_OFFS	(CPU_SPEEDO_REDUND_MSBIT - CPU_SPEEDO_MSBIT)
19 
20 #define SOC_SPEEDO_LSBIT		40
21 #define SOC_SPEEDO_MSBIT		47
22 #define SOC_SPEEDO_REDUND_LSBIT		48
23 #define SOC_SPEEDO_REDUND_MSBIT		55
24 #define SOC_SPEEDO_REDUND_OFFS	(SOC_SPEEDO_REDUND_MSBIT - SOC_SPEEDO_MSBIT)
25 
26 #define SPEEDO_MULT			4
27 
28 #define PROCESS_CORNERS_NUM		4
29 
30 #define SPEEDO_ID_SELECT_0(rev)		((rev) <= 2)
31 #define SPEEDO_ID_SELECT_1(sku)		\
32 	(((sku) != 20) && ((sku) != 23) && ((sku) != 24) && \
33 	 ((sku) != 27) && ((sku) != 28))
34 
35 enum {
36 	SPEEDO_ID_0,
37 	SPEEDO_ID_1,
38 	SPEEDO_ID_2,
39 	SPEEDO_ID_COUNT,
40 };
41 
42 static const u32 __initconst cpu_process_speedos[][PROCESS_CORNERS_NUM] = {
43 	{315, 366, 420, UINT_MAX},
44 	{303, 368, 419, UINT_MAX},
45 	{316, 331, 383, UINT_MAX},
46 };
47 
48 static const u32 __initconst soc_process_speedos[][PROCESS_CORNERS_NUM] = {
49 	{165, 195, 224, UINT_MAX},
50 	{165, 195, 224, UINT_MAX},
51 	{165, 195, 224, UINT_MAX},
52 };
53 
tegra20_init_speedo_data(struct tegra_sku_info * sku_info)54 void __init tegra20_init_speedo_data(struct tegra_sku_info *sku_info)
55 {
56 	u32 reg;
57 	u32 val;
58 	int i;
59 
60 	BUILD_BUG_ON(ARRAY_SIZE(cpu_process_speedos) != SPEEDO_ID_COUNT);
61 	BUILD_BUG_ON(ARRAY_SIZE(soc_process_speedos) != SPEEDO_ID_COUNT);
62 
63 	if (SPEEDO_ID_SELECT_0(sku_info->revision))
64 		sku_info->soc_speedo_id = SPEEDO_ID_0;
65 	else if (SPEEDO_ID_SELECT_1(sku_info->sku_id))
66 		sku_info->soc_speedo_id = SPEEDO_ID_1;
67 	else
68 		sku_info->soc_speedo_id = SPEEDO_ID_2;
69 
70 	val = 0;
71 	for (i = CPU_SPEEDO_MSBIT; i >= CPU_SPEEDO_LSBIT; i--) {
72 		reg = tegra_fuse_read_spare(i) |
73 			tegra_fuse_read_spare(i + CPU_SPEEDO_REDUND_OFFS);
74 		val = (val << 1) | (reg & 0x1);
75 	}
76 	val = val * SPEEDO_MULT;
77 	pr_debug("Tegra CPU speedo value %u\n", val);
78 
79 	for (i = 0; i < (PROCESS_CORNERS_NUM - 1); i++) {
80 		if (val <= cpu_process_speedos[sku_info->soc_speedo_id][i])
81 			break;
82 	}
83 	sku_info->cpu_process_id = i;
84 
85 	val = 0;
86 	for (i = SOC_SPEEDO_MSBIT; i >= SOC_SPEEDO_LSBIT; i--) {
87 		reg = tegra_fuse_read_spare(i) |
88 			tegra_fuse_read_spare(i + SOC_SPEEDO_REDUND_OFFS);
89 		val = (val << 1) | (reg & 0x1);
90 	}
91 	val = val * SPEEDO_MULT;
92 	pr_debug("Core speedo value %u\n", val);
93 
94 	for (i = 0; i < (PROCESS_CORNERS_NUM - 1); i++) {
95 		if (val <= soc_process_speedos[sku_info->soc_speedo_id][i])
96 			break;
97 	}
98 	sku_info->soc_process_id = i;
99 }
100