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soc/tegra: fuse-helper: add tegra_fuse_control_read()

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Various downstream drivers require reading fuse offsets < 0x100.

Add tegra_fuse_control_read(), which uses upstream tegra_fuse_readl()
to allow reading fuse offsets < 0x100.

Bug 3777983

Change-Id: I71c9a726eb748665923ed9547dd495073b89a9dc
Signed-off-by: Kartik <kkartik@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2795612
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>
Reviewed-by: Jonathan Hunter <jonathanh@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/2894846
GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>
Tested-by: Laxman Dewangan <ldewangan@nvidia.com>
This commit is contained in:
Kartik
2022-10-20 11:18:35 +00:00
committed by mobile promotions
parent 56d80b9a47
commit 1244fb5669
1 changed files with 31 additions and 1 deletions
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30
include/soc/tegra/fuse-helper.h
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@@ -3,9 +3,11 @@
* Copyright (c) 2022-2023, NVIDIA CORPORATION. All rights reserved.
*/
#include <linux/version.h>
#include <soc/tegra/fuse.h>
#define FUSE_SKU_INFO 0x10
#define FUSE_BEGIN 0x100
static inline u32 tegra_get_sku_id(void)
{
@@ -32,4 +34,32 @@ static inline bool tegra_platform_is_sim(void)
return false;
}
/*
* tegra_fuse_control_read() - allows reading fuse offsets < 0x100.
* @offset: Offset to be read.
* @value: Pointer to an unsigned integer where the value is stored.
*
* Function tegra_fuse_control_read() allows reading fuse_offsets < 0x100
* by using the already upstreamed tegra_fuse_readl() function.
*
* Return: Returns a negative integer in case of error, 0 in case
* of success.
*/
static inline int tegra_fuse_control_read(unsigned long offset, u32 *value)
{
/*
* Allow reading offsets between 0x0 - 0xff.
* For offsets > 0xff, use tegra_fuse_readl instead.
*/
if (WARN_ON(offset > 0xff))
return -EINVAL;
/*
* This will overflow the offset value, which is safe as
* tegra_fuse_readl() would again add 0x100 to it.
*/
offset -= FUSE_BEGIN;
return tegra_fuse_readl(offset, value);
}
#endif /* CONFIG_TEGRA_FUSE_UPSTREAM */