arch/arm/mach-tegra/tegra20_speedo.c

   1 /*
   2  * Copyright (c) 2012, 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/kernel.h>
  18 #include <linux/bug.h>
  19
  20 #include "fuse.h"
  21
  22 #define CPU_SPEEDO_LSBIT                20
  23 #define CPU_SPEEDO_MSBIT                29
  24 #define CPU_SPEEDO_REDUND_LSBIT         30
  25 #define CPU_SPEEDO_REDUND_MSBIT         39
  26 #define CPU_SPEEDO_REDUND_OFFS  (CPU_SPEEDO_REDUND_MSBIT - CPU_SPEEDO_MSBIT)
  27
  28 #define CORE_SPEEDO_LSBIT               40
  29 #define CORE_SPEEDO_MSBIT               47
  30 #define CORE_SPEEDO_REDUND_LSBIT        48
  31 #define CORE_SPEEDO_REDUND_MSBIT        55
  32 #define CORE_SPEEDO_REDUND_OFFS (CORE_SPEEDO_REDUND_MSBIT - CORE_SPEEDO_MSBIT)
  33
  34 #define SPEEDO_MULT                     4
  35
  36 #define PROCESS_CORNERS_NUM             4
  37
  38 #define SPEEDO_ID_SELECT_0(rev)         ((rev) <= 2)
  39 #define SPEEDO_ID_SELECT_1(sku)         \
  40         (((sku) != 20) && ((sku) != 23) && ((sku) != 24) && \
  41          ((sku) != 27) && ((sku) != 28))
  42
  43 enum {
  44         SPEEDO_ID_0,
  45         SPEEDO_ID_1,
  46         SPEEDO_ID_2,
  47         SPEEDO_ID_COUNT,
  48 };
  49
  50 static const u32 cpu_process_speedos[][PROCESS_CORNERS_NUM] = {
  51         {315, 366, 420, UINT_MAX},
  52         {303, 368, 419, UINT_MAX},
  53         {316, 331, 383, UINT_MAX},
  54 };
  55
  56 static const u32 core_process_speedos[][PROCESS_CORNERS_NUM] = {
  57         {165, 195, 224, UINT_MAX},
  58         {165, 195, 224, UINT_MAX},
  59         {165, 195, 224, UINT_MAX},
  60 };
  61
  62 void tegra20_init_speedo_data(void)
  63 {
  64         u32 reg;
  65         u32 val;
  66         int i;
  67
  68         BUILD_BUG_ON(ARRAY_SIZE(cpu_process_speedos) != SPEEDO_ID_COUNT);
  69         BUILD_BUG_ON(ARRAY_SIZE(core_process_speedos) != SPEEDO_ID_COUNT);
  70
  71         if (SPEEDO_ID_SELECT_0(tegra_revision))
  72                 tegra_soc_speedo_id = SPEEDO_ID_0;
  73         else if (SPEEDO_ID_SELECT_1(tegra_sku_id))
  74                 tegra_soc_speedo_id = SPEEDO_ID_1;
  75         else
  76                 tegra_soc_speedo_id = SPEEDO_ID_2;
  77
  78         val = 0;
  79         for (i = CPU_SPEEDO_MSBIT; i >= CPU_SPEEDO_LSBIT; i--) {
  80                 reg = tegra_spare_fuse(i) |
  81                         tegra_spare_fuse(i + CPU_SPEEDO_REDUND_OFFS);
  82                 val = (val << 1) | (reg & 0x1);
  83         }
  84         val = val * SPEEDO_MULT;
  85         pr_debug("%s CPU speedo value %u\n", __func__, val);
  86
  87         for (i = 0; i < (PROCESS_CORNERS_NUM - 1); i++) {
  88                 if (val <= cpu_process_speedos[tegra_soc_speedo_id][i])
  89                         break;
  90         }
  91         tegra_cpu_process_id = i;
  92
  93         val = 0;
  94         for (i = CORE_SPEEDO_MSBIT; i >= CORE_SPEEDO_LSBIT; i--) {
  95                 reg = tegra_spare_fuse(i) |
  96                         tegra_spare_fuse(i + CORE_SPEEDO_REDUND_OFFS);
  97                 val = (val << 1) | (reg & 0x1);
  98         }
  99         val = val * SPEEDO_MULT;
 100         pr_debug("%s Core speedo value %u\n", __func__, val);
 101
 102         for (i = 0; i < (PROCESS_CORNERS_NUM - 1); i++) {
 103                 if (val <= core_process_speedos[tegra_soc_speedo_id][i])
 104                         break;
 105         }
 106         tegra_core_process_id = i;
 107
 108         pr_info("Tegra20 Soc Speedo ID %d", tegra_soc_speedo_id);
 109 }