diff options
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, 0 insertions, 130 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 deleted file mode 100644 index ebeb6f5ad3..0000000000 --- a/target/linux/generic/backport-5.10/809-v5.19-0006-nvmem-Add-Apple-eFuse-driver.patch +++ /dev/null @@ -1,130 +0,0 @@ -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"); |