Add the rt linux 4.1.3-rt3 as base
[kvmfornfv.git] / kernel / drivers / soc / tegra / fuse / speedo-tegra20.c
1 /*
2  * Copyright (c) 2012-2014, NVIDIA CORPORATION.  All rights reserved.
3  *
4  * This program is free software; you can redistribute it and/or modify it
5  * under the terms and conditions of the GNU General Public License,
6  * version 2, as published by the Free Software Foundation.
7  *
8  * This program is distributed in the hope it will be useful, but WITHOUT
9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
11  * more details.
12  *
13  * You should have received a copy of the GNU General Public License
14  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
15  */
16
17 #include <linux/bug.h>
18 #include <linux/device.h>
19 #include <linux/kernel.h>
20
21 #include <soc/tegra/fuse.h>
22
23 #include "fuse.h"
24
25 #define CPU_SPEEDO_LSBIT                20
26 #define CPU_SPEEDO_MSBIT                29
27 #define CPU_SPEEDO_REDUND_LSBIT         30
28 #define CPU_SPEEDO_REDUND_MSBIT         39
29 #define CPU_SPEEDO_REDUND_OFFS  (CPU_SPEEDO_REDUND_MSBIT - CPU_SPEEDO_MSBIT)
30
31 #define CORE_SPEEDO_LSBIT               40
32 #define CORE_SPEEDO_MSBIT               47
33 #define CORE_SPEEDO_REDUND_LSBIT        48
34 #define CORE_SPEEDO_REDUND_MSBIT        55
35 #define CORE_SPEEDO_REDUND_OFFS (CORE_SPEEDO_REDUND_MSBIT - CORE_SPEEDO_MSBIT)
36
37 #define SPEEDO_MULT                     4
38
39 #define PROCESS_CORNERS_NUM             4
40
41 #define SPEEDO_ID_SELECT_0(rev)         ((rev) <= 2)
42 #define SPEEDO_ID_SELECT_1(sku)         \
43         (((sku) != 20) && ((sku) != 23) && ((sku) != 24) && \
44          ((sku) != 27) && ((sku) != 28))
45
46 enum {
47         SPEEDO_ID_0,
48         SPEEDO_ID_1,
49         SPEEDO_ID_2,
50         SPEEDO_ID_COUNT,
51 };
52
53 static const u32 __initconst cpu_process_speedos[][PROCESS_CORNERS_NUM] = {
54         {315, 366, 420, UINT_MAX},
55         {303, 368, 419, UINT_MAX},
56         {316, 331, 383, UINT_MAX},
57 };
58
59 static const u32 __initconst core_process_speedos[][PROCESS_CORNERS_NUM] = {
60         {165, 195, 224, UINT_MAX},
61         {165, 195, 224, UINT_MAX},
62         {165, 195, 224, UINT_MAX},
63 };
64
65 void __init tegra20_init_speedo_data(struct tegra_sku_info *sku_info)
66 {
67         u32 reg;
68         u32 val;
69         int i;
70
71         BUILD_BUG_ON(ARRAY_SIZE(cpu_process_speedos) != SPEEDO_ID_COUNT);
72         BUILD_BUG_ON(ARRAY_SIZE(core_process_speedos) != SPEEDO_ID_COUNT);
73
74         if (SPEEDO_ID_SELECT_0(sku_info->revision))
75                 sku_info->soc_speedo_id = SPEEDO_ID_0;
76         else if (SPEEDO_ID_SELECT_1(sku_info->sku_id))
77                 sku_info->soc_speedo_id = SPEEDO_ID_1;
78         else
79                 sku_info->soc_speedo_id = SPEEDO_ID_2;
80
81         val = 0;
82         for (i = CPU_SPEEDO_MSBIT; i >= CPU_SPEEDO_LSBIT; i--) {
83                 reg = tegra20_spare_fuse_early(i) |
84                         tegra20_spare_fuse_early(i + CPU_SPEEDO_REDUND_OFFS);
85                 val = (val << 1) | (reg & 0x1);
86         }
87         val = val * SPEEDO_MULT;
88         pr_debug("Tegra CPU speedo value %u\n", val);
89
90         for (i = 0; i < (PROCESS_CORNERS_NUM - 1); i++) {
91                 if (val <= cpu_process_speedos[sku_info->soc_speedo_id][i])
92                         break;
93         }
94         sku_info->cpu_process_id = i;
95
96         val = 0;
97         for (i = CORE_SPEEDO_MSBIT; i >= CORE_SPEEDO_LSBIT; i--) {
98                 reg = tegra20_spare_fuse_early(i) |
99                         tegra20_spare_fuse_early(i + CORE_SPEEDO_REDUND_OFFS);
100                 val = (val << 1) | (reg & 0x1);
101         }
102         val = val * SPEEDO_MULT;
103         pr_debug("Core speedo value %u\n", val);
104
105         for (i = 0; i < (PROCESS_CORNERS_NUM - 1); i++) {
106                 if (val <= core_process_speedos[sku_info->soc_speedo_id][i])
107                         break;
108         }
109         sku_info->core_process_id = i;
110 }