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b1258105f9
The manufacturing access to the PCH/SoC SPI device is traditionally performed via userspace driver accessing registers via /dev/mem but due to security concerns /dev/mem access is being much restricted, hence the reason for utilizing dedicated Intel PCH/SoC SPI controller driver, which is already implemented in the Linux kernel. Intel PCH/SoC SPI controller protects the flash storage via two mechanisms one is the via region protection registers and second via BIOS lock. The BIOS locks only the BIOS regions usually 0 and/or 6. The device always boots with BIOS lock set, but during manufacturing the BIOS lock has to be lifted in order to enable the write access. This can be done by passing "writeable=1" in the command line when the driver is loaded. This "locked" state is exposed through new sysfs attributes (intel_spi_locked, intel_spi_bios_locked). Second, also the region protection status is exposed via sysfs attribute (intel_spi_protected) as the manufacturing will need the both files in order to validate that the device is properly sealed. Includes code written by Tamar Mashiah. Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Co-developed-by: Tomas Winkler <tomasw@gmail.com> Signed-off-by: Tomas Winkler <tomasw@gmail.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Link: https://patch.msgid.link/20241009062244.2436793-1-mika.westerberg@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
41 lines
1012 B
C
41 lines
1012 B
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Intel PCH/PCU SPI flash platform driver.
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*
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* Copyright (C) 2016 - 2022, Intel Corporation
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* Author: Mika Westerberg <mika.westerberg@linux.intel.com>
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*/
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include "spi-intel.h"
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static int intel_spi_platform_probe(struct platform_device *pdev)
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{
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struct intel_spi_boardinfo *info;
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struct resource *mem;
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info = dev_get_platdata(&pdev->dev);
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if (!info)
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return -EINVAL;
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mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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return intel_spi_probe(&pdev->dev, mem, info);
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}
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static struct platform_driver intel_spi_platform_driver = {
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.probe = intel_spi_platform_probe,
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.driver = {
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.name = "intel-spi",
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.dev_groups = intel_spi_groups,
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},
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};
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module_platform_driver(intel_spi_platform_driver);
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MODULE_DESCRIPTION("Intel PCH/PCU SPI flash platform driver");
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MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:intel-spi");
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