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Sun, 27 Feb 2022 06:57:51 -0500 (EST) From: Sven Peter To: Srinivas Kandagatla , Rob Herring Cc: Sven Peter , Hector Martin , Alyssa Rosenzweig , Mark Kettenis , linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 1/2] dt-bindings: nvmem: Add apple,efuses Date: Sun, 27 Feb 2022 12:57:42 +0100 Message-Id: <20220227115743.69059-1-sven@svenpeter.dev> X-Mailer: git-send-email 2.30.1 (Apple Git-130) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220227_035800_593527_932D70A2 X-CRM114-Status: GOOD ( 12.26 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Apple SoCs come with eFuses used to store factory-programmed data such as calibration settings for the PCIe and Type-C PHY. Signed-off-by: Sven Peter --- .../bindings/nvmem/apple,efuses.yaml | 50 +++++++++++++++++++ MAINTAINERS | 1 + 2 files changed, 51 insertions(+) create mode 100644 Documentation/devicetree/bindings/nvmem/apple,efuses.yaml diff --git a/Documentation/devicetree/bindings/nvmem/apple,efuses.yaml b/Documentation/devicetree/bindings/nvmem/apple,efuses.yaml new file mode 100644 index 000000000000..a735d54856ae --- /dev/null +++ b/Documentation/devicetree/bindings/nvmem/apple,efuses.yaml @@ -0,0 +1,50 @@ +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/nvmem/apple,efuses.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Apple SoC eFuse-based NVMEM + +description: | + Apple SoCs such as the M1 contain factory-programmed eFuses used to e.g. store + calibration data for the PCIe and the Type-C PHY or unique chip identifiers such + as the ECID. + +maintainers: + - Sven Peter + +allOf: + - $ref: "nvmem.yaml#" + +properties: + compatible: + items: + - enum: + - apple,t8103-efuses + - apple,t6000-efuses + - const: apple,efuses + + reg: + maxItems: 1 + +required: + - compatible + - reg + +unevaluatedProperties: false + +examples: + - | + efuse@3d2bc000 { + compatible = "apple,t8103-efuses", "apple,efuses"; + reg = <0x3d2bc000 0x1000>; + #address-cells = <1>; + #size-cells = <1>; + + ecid: efuse@500 { + reg = <0x500 0x8>; + }; + }; + +... diff --git a/MAINTAINERS b/MAINTAINERS index 2524b75763cd..1bc57af09c80 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -1771,6 +1771,7 @@ F: Documentation/devicetree/bindings/arm/apple/* F: Documentation/devicetree/bindings/i2c/apple,i2c.yaml F: Documentation/devicetree/bindings/interrupt-controller/apple,aic.yaml F: Documentation/devicetree/bindings/mailbox/apple,mailbox.yaml +F: Documentation/devicetree/bindings/nvmem/apple,efuses.yaml F: Documentation/devicetree/bindings/pci/apple,pcie.yaml F: Documentation/devicetree/bindings/pinctrl/apple,pinctrl.yaml F: Documentation/devicetree/bindings/power/apple* From patchwork Sun Feb 27 11:57:43 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sven Peter X-Patchwork-Id: 12761608 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 13106C433EF for ; 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Sun, 27 Feb 2022 06:57:55 -0500 (EST) From: Sven Peter To: Srinivas Kandagatla , Rob Herring Cc: Sven Peter , Hector Martin , Alyssa Rosenzweig , Mark Kettenis , linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/2] nvmem: Add Apple eFuse driver Date: Sun, 27 Feb 2022 12:57:43 +0100 Message-Id: <20220227115743.69059-2-sven@svenpeter.dev> X-Mailer: git-send-email 2.30.1 (Apple Git-130) In-Reply-To: <20220227115743.69059-1-sven@svenpeter.dev> References: <20220227115743.69059-1-sven@svenpeter.dev> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220227_035800_719074_A8EDC947 X-CRM114-Status: GOOD ( 20.85 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 Reported-by: kernel test robot --- MAINTAINERS | 1 + drivers/nvmem/Kconfig | 12 +++++++ drivers/nvmem/Makefile | 2 ++ drivers/nvmem/apple-efuses.c | 67 ++++++++++++++++++++++++++++++++++++ 4 files changed, 82 insertions(+) create mode 100644 drivers/nvmem/apple-efuses.c diff --git a/MAINTAINERS b/MAINTAINERS index 1bc57af09c80..031198aec108 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -1781,6 +1781,7 @@ F: drivers/i2c/busses/i2c-pasemi-core.c F: drivers/i2c/busses/i2c-pasemi-platform.c F: drivers/irqchip/irq-apple-aic.c F: drivers/mailbox/apple-mailbox.c +F: drivers/nvmem/apple-efuses.c F: drivers/pinctrl/pinctrl-apple-gpio.c F: drivers/soc/apple/* F: drivers/watchdog/apple_wdt.c diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig index da414617a54d..ef6a13c8a4d6 100644 --- a/drivers/nvmem/Kconfig +++ b/drivers/nvmem/Kconfig @@ -300,4 +300,16 @@ config NVMEM_BRCM_NVRAM This driver provides support for Broadcom's NVRAM that can be accessed using I/O mapping. +config NVMEM_APPLE_EFUSES + tristate "Apple eFuse support" + depends on ARCH_APPLE || COMPILE_TEST + default ARCH_APPLE + help + Say y here to enabled 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 diff --git a/drivers/nvmem/Makefile b/drivers/nvmem/Makefile index dcbbde35b6a8..1a8e54691d3e 100644 --- a/drivers/nvmem/Makefile +++ b/drivers/nvmem/Makefile @@ -61,3 +61,5 @@ obj-$(CONFIG_NVMEM_RMEM) += nvmem-rmem.o nvmem-rmem-y := rmem.o obj-$(CONFIG_NVMEM_BRCM_NVRAM) += nvmem_brcm_nvram.o nvmem_brcm_nvram-y := brcm_nvram.o +obj-$(CONFIG_NVMEM_APPLE_EFUSES) += nvmem-apple-efuses.o +nvmem-apple-efuses-y := apple-efuses.o diff --git a/drivers/nvmem/apple-efuses.c b/drivers/nvmem/apple-efuses.c new file mode 100644 index 000000000000..925fc0033b83 --- /dev/null +++ b/drivers/nvmem/apple-efuses.c @@ -0,0 +1,67 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Apple SoC eFuse driver + * + * Copyright (C) The Asahi Linux Contributors + */ + +#include +#include +#include +#include +#include + +static int apple_efuses_read(void *context, unsigned int offset, void *val, + size_t bytes) +{ + void __iomem *fuses = context; + u32 *dst = val; + + while (bytes >= sizeof(u32)) { + *dst++ = readl_relaxed(fuses + offset); + bytes -= sizeof(u32); + offset += sizeof(u32); + } + + return 0; +} + +static int apple_efuses_probe(struct platform_device *pdev) +{ + 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, + }; + + config.priv = devm_platform_get_and_ioremap_resource(pdev, 0, &res); + if (IS_ERR(config.priv)) + return PTR_ERR(config.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", }, + {} +}; + +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 "); +MODULE_LICENSE("GPL");