-
Notifications
You must be signed in to change notification settings - Fork 5
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
ARM: tegra: Add speedo-based process identification
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>
- Loading branch information
Showing
4 changed files
with
140 additions
and
8 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,109 @@ | ||
/* | ||
* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved. | ||
* | ||
* This program is free software; you can redistribute it and/or modify it | ||
* under the terms and conditions of the GNU General Public License, | ||
* version 2, as published by the Free Software Foundation. | ||
* | ||
* This program is distributed in the hope it will be useful, but WITHOUT | ||
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | ||
* more details. | ||
* | ||
* You should have received a copy of the GNU General Public License | ||
* along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
*/ | ||
|
||
#include <linux/kernel.h> | ||
#include <linux/bug.h> | ||
|
||
#include "fuse.h" | ||
|
||
#define CPU_SPEEDO_LSBIT 20 | ||
#define CPU_SPEEDO_MSBIT 29 | ||
#define CPU_SPEEDO_REDUND_LSBIT 30 | ||
#define CPU_SPEEDO_REDUND_MSBIT 39 | ||
#define CPU_SPEEDO_REDUND_OFFS (CPU_SPEEDO_REDUND_MSBIT - CPU_SPEEDO_MSBIT) | ||
|
||
#define CORE_SPEEDO_LSBIT 40 | ||
#define CORE_SPEEDO_MSBIT 47 | ||
#define CORE_SPEEDO_REDUND_LSBIT 48 | ||
#define CORE_SPEEDO_REDUND_MSBIT 55 | ||
#define CORE_SPEEDO_REDUND_OFFS (CORE_SPEEDO_REDUND_MSBIT - CORE_SPEEDO_MSBIT) | ||
|
||
#define SPEEDO_MULT 4 | ||
|
||
#define PROCESS_CORNERS_NUM 4 | ||
|
||
#define SPEEDO_ID_SELECT_0(rev) ((rev) <= 2) | ||
#define SPEEDO_ID_SELECT_1(sku) \ | ||
(((sku) != 20) && ((sku) != 23) && ((sku) != 24) && \ | ||
((sku) != 27) && ((sku) != 28)) | ||
|
||
enum { | ||
SPEEDO_ID_0, | ||
SPEEDO_ID_1, | ||
SPEEDO_ID_2, | ||
SPEEDO_ID_COUNT, | ||
}; | ||
|
||
static const u32 cpu_process_speedos[][PROCESS_CORNERS_NUM] = { | ||
{315, 366, 420, UINT_MAX}, | ||
{303, 368, 419, UINT_MAX}, | ||
{316, 331, 383, UINT_MAX}, | ||
}; | ||
|
||
static const u32 core_process_speedos[][PROCESS_CORNERS_NUM] = { | ||
{165, 195, 224, UINT_MAX}, | ||
{165, 195, 224, UINT_MAX}, | ||
{165, 195, 224, UINT_MAX}, | ||
}; | ||
|
||
void tegra20_init_speedo_data(void) | ||
{ | ||
u32 reg; | ||
u32 val; | ||
int i; | ||
|
||
BUILD_BUG_ON(ARRAY_SIZE(cpu_process_speedos) != SPEEDO_ID_COUNT); | ||
BUILD_BUG_ON(ARRAY_SIZE(core_process_speedos) != SPEEDO_ID_COUNT); | ||
|
||
if (SPEEDO_ID_SELECT_0(tegra_revision)) | ||
tegra_soc_speedo_id = SPEEDO_ID_0; | ||
else if (SPEEDO_ID_SELECT_1(tegra_sku_id)) | ||
tegra_soc_speedo_id = SPEEDO_ID_1; | ||
else | ||
tegra_soc_speedo_id = SPEEDO_ID_2; | ||
|
||
val = 0; | ||
for (i = CPU_SPEEDO_MSBIT; i >= CPU_SPEEDO_LSBIT; i--) { | ||
reg = tegra_spare_fuse(i) | | ||
tegra_spare_fuse(i + CPU_SPEEDO_REDUND_OFFS); | ||
val = (val << 1) | (reg & 0x1); | ||
} | ||
val = val * SPEEDO_MULT; | ||
pr_debug("%s CPU speedo value %u\n", __func__, val); | ||
|
||
for (i = 0; i < (PROCESS_CORNERS_NUM - 1); i++) { | ||
if (val <= cpu_process_speedos[tegra_soc_speedo_id][i]) | ||
break; | ||
} | ||
tegra_cpu_process_id = i; | ||
|
||
val = 0; | ||
for (i = CORE_SPEEDO_MSBIT; i >= CORE_SPEEDO_LSBIT; i--) { | ||
reg = tegra_spare_fuse(i) | | ||
tegra_spare_fuse(i + CORE_SPEEDO_REDUND_OFFS); | ||
val = (val << 1) | (reg & 0x1); | ||
} | ||
val = val * SPEEDO_MULT; | ||
pr_debug("%s Core speedo value %u\n", __func__, val); | ||
|
||
for (i = 0; i < (PROCESS_CORNERS_NUM - 1); i++) { | ||
if (val <= core_process_speedos[tegra_soc_speedo_id][i]) | ||
break; | ||
} | ||
tegra_core_process_id = i; | ||
|
||
pr_info("Tegra20 Soc Speedo ID %d", tegra_soc_speedo_id); | ||
} |