diff options
author | Rafał Miłecki <rafal@milecki.pl> | 2023-01-06 19:37:37 +0100 |
---|---|---|
committer | Rafał Miłecki <rafal@milecki.pl> | 2023-01-06 22:08:03 +0100 |
commit | 8dfe69cdfc5c943f946faa873ff330b47125011d (patch) | |
tree | a68e869e00bcadec6c32252916e1a0fc5e18c51d /target/linux/generic/backport-5.10/809-v5.19-0006-nvmem-Add-Apple-eFuse-driver.patch | |
parent | d3e89e69c52115d1c02f5c16a4aa6b721e003578 (diff) | |
download | upstream-8dfe69cdfc5c943f946faa873ff330b47125011d.tar.gz upstream-8dfe69cdfc5c943f946faa873ff330b47125011d.tar.bz2 upstream-8dfe69cdfc5c943f946faa873ff330b47125011d.zip |
kernel: update nvmem subsystem to the latest upstream
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Diffstat (limited to 'target/linux/generic/backport-5.10/809-v5.19-0006-nvmem-Add-Apple-eFuse-driver.patch')
-rw-r--r-- | target/linux/generic/backport-5.10/809-v5.19-0006-nvmem-Add-Apple-eFuse-driver.patch | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/target/linux/generic/backport-5.10/809-v5.19-0006-nvmem-Add-Apple-eFuse-driver.patch b/target/linux/generic/backport-5.10/809-v5.19-0006-nvmem-Add-Apple-eFuse-driver.patch new file mode 100644 index 0000000000..ebeb6f5ad3 --- /dev/null +++ b/target/linux/generic/backport-5.10/809-v5.19-0006-nvmem-Add-Apple-eFuse-driver.patch @@ -0,0 +1,130 @@ +From b6b7ef932ae838209254f016ecf8862d716a5ced Mon Sep 17 00:00:00 2001 +From: Sven Peter <sven@svenpeter.dev> +Date: Fri, 29 Apr 2022 17:26:50 +0100 +Subject: [PATCH] nvmem: Add Apple eFuse driver + +Apple SoCs contain eFuses used to store factory-programmed data such +as calibration values for the PCIe or the Type-C PHY. They are organized +as 32bit values exposed as MMIO. + +Signed-off-by: Sven Peter <sven@svenpeter.dev> +Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> +Link: https://lore.kernel.org/r/20220429162701.2222-6-srinivas.kandagatla@linaro.org +Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> +--- + drivers/nvmem/Kconfig | 12 ++++++ + drivers/nvmem/Makefile | 2 + + drivers/nvmem/apple-efuses.c | 80 ++++++++++++++++++++++++++++++++++++ + 3 files changed, 94 insertions(+) + create mode 100644 drivers/nvmem/apple-efuses.c + +--- a/drivers/nvmem/Kconfig ++++ b/drivers/nvmem/Kconfig +@@ -324,4 +324,16 @@ config NVMEM_SUNPLUS_OCOTP + This driver can also be built as a module. If so, the module + will be called nvmem-sunplus-ocotp. + ++config NVMEM_APPLE_EFUSES ++ tristate "Apple eFuse support" ++ depends on ARCH_APPLE || COMPILE_TEST ++ default ARCH_APPLE ++ help ++ Say y here to enable support for reading eFuses on Apple SoCs ++ such as the M1. These are e.g. used to store factory programmed ++ calibration data required for the PCIe or the USB-C PHY. ++ ++ This driver can also be built as a module. If so, the module will ++ be called nvmem-apple-efuses. ++ + endif +--- a/drivers/nvmem/Makefile ++++ b/drivers/nvmem/Makefile +@@ -65,3 +65,5 @@ obj-$(CONFIG_NVMEM_LAYERSCAPE_SFP) += nv + nvmem-layerscape-sfp-y := layerscape-sfp.o + obj-$(CONFIG_NVMEM_SUNPLUS_OCOTP) += nvmem_sunplus_ocotp.o + nvmem_sunplus_ocotp-y := sunplus-ocotp.o ++obj-$(CONFIG_NVMEM_APPLE_EFUSES) += nvmem-apple-efuses.o ++nvmem-apple-efuses-y := apple-efuses.o +--- /dev/null ++++ b/drivers/nvmem/apple-efuses.c +@@ -0,0 +1,80 @@ ++// SPDX-License-Identifier: GPL-2.0-only ++/* ++ * Apple SoC eFuse driver ++ * ++ * Copyright (C) The Asahi Linux Contributors ++ */ ++ ++#include <linux/io.h> ++#include <linux/mod_devicetable.h> ++#include <linux/module.h> ++#include <linux/nvmem-provider.h> ++#include <linux/platform_device.h> ++ ++struct apple_efuses_priv { ++ void __iomem *fuses; ++}; ++ ++static int apple_efuses_read(void *context, unsigned int offset, void *val, ++ size_t bytes) ++{ ++ struct apple_efuses_priv *priv = context; ++ u32 *dst = val; ++ ++ while (bytes >= sizeof(u32)) { ++ *dst++ = readl_relaxed(priv->fuses + offset); ++ bytes -= sizeof(u32); ++ offset += sizeof(u32); ++ } ++ ++ return 0; ++} ++ ++static int apple_efuses_probe(struct platform_device *pdev) ++{ ++ struct apple_efuses_priv *priv; ++ struct resource *res; ++ struct nvmem_config config = { ++ .dev = &pdev->dev, ++ .read_only = true, ++ .reg_read = apple_efuses_read, ++ .stride = sizeof(u32), ++ .word_size = sizeof(u32), ++ .name = "apple_efuses_nvmem", ++ .id = NVMEM_DEVID_AUTO, ++ .root_only = true, ++ }; ++ ++ priv = devm_kzalloc(config.dev, sizeof(*priv), GFP_KERNEL); ++ if (!priv) ++ return -ENOMEM; ++ ++ priv->fuses = devm_platform_get_and_ioremap_resource(pdev, 0, &res); ++ if (IS_ERR(priv->fuses)) ++ return PTR_ERR(priv->fuses); ++ ++ config.priv = priv; ++ config.size = resource_size(res); ++ ++ return PTR_ERR_OR_ZERO(devm_nvmem_register(config.dev, &config)); ++} ++ ++static const struct of_device_id apple_efuses_of_match[] = { ++ { .compatible = "apple,efuses", }, ++ {} ++}; ++ ++MODULE_DEVICE_TABLE(of, apple_efuses_of_match); ++ ++static struct platform_driver apple_efuses_driver = { ++ .driver = { ++ .name = "apple_efuses", ++ .of_match_table = apple_efuses_of_match, ++ }, ++ .probe = apple_efuses_probe, ++}; ++ ++module_platform_driver(apple_efuses_driver); ++ ++MODULE_AUTHOR("Sven Peter <sven@svenpeter.dev>"); ++MODULE_LICENSE("GPL"); |