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25cd5a3914
Detect CPU and core process ID by checking speedo corner tables. This can provide a more accurate process ID. Signed-off-by: Danny Huang <dahuang@nvidia.com> [swarren s/Tegra2/Tegra20/ in log print] Signed-off-by: Stephen Warren <swarren@nvidia.com>
110 lines
3.0 KiB
C
110 lines
3.0 KiB
C
/*
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* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/kernel.h>
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#include <linux/bug.h>
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#include "fuse.h"
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#define CPU_SPEEDO_LSBIT 20
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#define CPU_SPEEDO_MSBIT 29
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#define CPU_SPEEDO_REDUND_LSBIT 30
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#define CPU_SPEEDO_REDUND_MSBIT 39
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#define CPU_SPEEDO_REDUND_OFFS (CPU_SPEEDO_REDUND_MSBIT - CPU_SPEEDO_MSBIT)
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#define CORE_SPEEDO_LSBIT 40
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#define CORE_SPEEDO_MSBIT 47
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#define CORE_SPEEDO_REDUND_LSBIT 48
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#define CORE_SPEEDO_REDUND_MSBIT 55
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#define CORE_SPEEDO_REDUND_OFFS (CORE_SPEEDO_REDUND_MSBIT - CORE_SPEEDO_MSBIT)
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#define SPEEDO_MULT 4
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#define PROCESS_CORNERS_NUM 4
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#define SPEEDO_ID_SELECT_0(rev) ((rev) <= 2)
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#define SPEEDO_ID_SELECT_1(sku) \
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(((sku) != 20) && ((sku) != 23) && ((sku) != 24) && \
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((sku) != 27) && ((sku) != 28))
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enum {
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SPEEDO_ID_0,
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SPEEDO_ID_1,
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SPEEDO_ID_2,
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SPEEDO_ID_COUNT,
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};
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static const u32 cpu_process_speedos[][PROCESS_CORNERS_NUM] = {
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{315, 366, 420, UINT_MAX},
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{303, 368, 419, UINT_MAX},
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{316, 331, 383, UINT_MAX},
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};
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static const u32 core_process_speedos[][PROCESS_CORNERS_NUM] = {
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{165, 195, 224, UINT_MAX},
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{165, 195, 224, UINT_MAX},
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{165, 195, 224, UINT_MAX},
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};
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void tegra20_init_speedo_data(void)
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{
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u32 reg;
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u32 val;
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int i;
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BUILD_BUG_ON(ARRAY_SIZE(cpu_process_speedos) != SPEEDO_ID_COUNT);
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BUILD_BUG_ON(ARRAY_SIZE(core_process_speedos) != SPEEDO_ID_COUNT);
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if (SPEEDO_ID_SELECT_0(tegra_revision))
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tegra_soc_speedo_id = SPEEDO_ID_0;
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else if (SPEEDO_ID_SELECT_1(tegra_sku_id))
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tegra_soc_speedo_id = SPEEDO_ID_1;
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else
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tegra_soc_speedo_id = SPEEDO_ID_2;
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val = 0;
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for (i = CPU_SPEEDO_MSBIT; i >= CPU_SPEEDO_LSBIT; i--) {
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reg = tegra_spare_fuse(i) |
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tegra_spare_fuse(i + CPU_SPEEDO_REDUND_OFFS);
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val = (val << 1) | (reg & 0x1);
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}
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val = val * SPEEDO_MULT;
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pr_debug("%s CPU speedo value %u\n", __func__, val);
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for (i = 0; i < (PROCESS_CORNERS_NUM - 1); i++) {
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if (val <= cpu_process_speedos[tegra_soc_speedo_id][i])
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break;
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}
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tegra_cpu_process_id = i;
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val = 0;
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for (i = CORE_SPEEDO_MSBIT; i >= CORE_SPEEDO_LSBIT; i--) {
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reg = tegra_spare_fuse(i) |
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tegra_spare_fuse(i + CORE_SPEEDO_REDUND_OFFS);
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val = (val << 1) | (reg & 0x1);
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}
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val = val * SPEEDO_MULT;
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pr_debug("%s Core speedo value %u\n", __func__, val);
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for (i = 0; i < (PROCESS_CORNERS_NUM - 1); i++) {
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if (val <= core_process_speedos[tegra_soc_speedo_id][i])
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break;
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}
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tegra_core_process_id = i;
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pr_info("Tegra20 Soc Speedo ID %d", tegra_soc_speedo_id);
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}
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