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1244fb5669
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>
66 lines
1.6 KiB
C
66 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (c) 2022-2023, NVIDIA CORPORATION. All rights reserved.
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*/
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#include <linux/version.h>
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#include <soc/tegra/fuse.h>
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#define FUSE_SKU_INFO 0x10
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#define FUSE_BEGIN 0x100
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static inline u32 tegra_get_sku_id(void)
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{
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if (!tegra_sku_info.sku_id)
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tegra_fuse_readl(FUSE_SKU_INFO, &tegra_sku_info.sku_id);
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return tegra_sku_info.sku_id;
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}
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#ifdef CONFIG_TEGRA_FUSE_UPSTREAM
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/*
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* For upstream the following functions to determine if the
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* platform is silicon and simulator are not supported and
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* so for now, always assume that we are silicon.
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*/
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static inline bool tegra_platform_is_silicon(void)
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{
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return true;
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}
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static inline bool tegra_platform_is_sim(void)
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{
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return false;
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}
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/*
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* tegra_fuse_control_read() - allows reading fuse offsets < 0x100.
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* @offset: Offset to be read.
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* @value: Pointer to an unsigned integer where the value is stored.
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*
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* Function tegra_fuse_control_read() allows reading fuse_offsets < 0x100
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* by using the already upstreamed tegra_fuse_readl() function.
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*
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* Return: Returns a negative integer in case of error, 0 in case
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* of success.
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*/
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static inline int tegra_fuse_control_read(unsigned long offset, u32 *value)
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{
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/*
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* Allow reading offsets between 0x0 - 0xff.
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* For offsets > 0xff, use tegra_fuse_readl instead.
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*/
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if (WARN_ON(offset > 0xff))
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return -EINVAL;
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/*
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* This will overflow the offset value, which is safe as
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* tegra_fuse_readl() would again add 0x100 to it.
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*/
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offset -= FUSE_BEGIN;
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return tegra_fuse_readl(offset, value);
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}
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#endif /* CONFIG_TEGRA_FUSE_UPSTREAM */
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