diff options
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/spi-nor/Kconfig | 16 | ||||
| -rw-r--r-- | drivers/mtd/spi-nor/Makefile | 1 | ||||
| -rw-r--r-- | drivers/mtd/spi-nor/intel-spi-pci.c | 82 |
3 files changed, 99 insertions, 0 deletions
diff --git a/drivers/mtd/spi-nor/Kconfig b/drivers/mtd/spi-nor/Kconfig index 293c8a4d1e49..69c638dd0484 100644 --- a/drivers/mtd/spi-nor/Kconfig +++ b/drivers/mtd/spi-nor/Kconfig @@ -89,6 +89,22 @@ config SPI_NXP_SPIFI config SPI_INTEL_SPI tristate +config SPI_INTEL_SPI_PCI + tristate "Intel PCH/PCU SPI flash PCI driver" if EXPERT + depends on X86 && PCI + select SPI_INTEL_SPI + help + This enables PCI support for the Intel PCH/PCU SPI controller in + master mode. This controller is present in modern Intel hardware + and is used to hold BIOS and other persistent settings. Using + this driver it is possible to upgrade BIOS directly from Linux. + + Say N here unless you know what you are doing. Overwriting the + SPI flash may render the system unbootable. + + To compile this driver as a module, choose M here: the module + will be called intel-spi-pci. + config SPI_INTEL_SPI_PLATFORM tristate "Intel PCH/PCU SPI flash platform driver" if EXPERT depends on X86 diff --git a/drivers/mtd/spi-nor/Makefile b/drivers/mtd/spi-nor/Makefile index 285aab86c7ca..c5f171de0e1a 100644 --- a/drivers/mtd/spi-nor/Makefile +++ b/drivers/mtd/spi-nor/Makefile @@ -7,5 +7,6 @@ obj-$(CONFIG_SPI_HISI_SFC) += hisi-sfc.o obj-$(CONFIG_MTD_MT81xx_NOR) += mtk-quadspi.o obj-$(CONFIG_SPI_NXP_SPIFI) += nxp-spifi.o obj-$(CONFIG_SPI_INTEL_SPI) += intel-spi.o +obj-$(CONFIG_SPI_INTEL_SPI_PCI) += intel-spi-pci.o obj-$(CONFIG_SPI_INTEL_SPI_PLATFORM) += intel-spi-platform.o obj-$(CONFIG_SPI_STM32_QUADSPI) += stm32-quadspi.o
\ No newline at end of file diff --git a/drivers/mtd/spi-nor/intel-spi-pci.c b/drivers/mtd/spi-nor/intel-spi-pci.c new file mode 100644 index 000000000000..e82652335ede --- /dev/null +++ b/drivers/mtd/spi-nor/intel-spi-pci.c @@ -0,0 +1,82 @@ +/* + * Intel PCH/PCU SPI flash PCI driver. + * + * Copyright (C) 2016, Intel Corporation + * Author: Mika Westerberg <mika.westerberg@linux.intel.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/ioport.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/pci.h> + +#include "intel-spi.h" + +#define BCR 0xdc +#define BCR_WPD BIT(0) + +static const struct intel_spi_boardinfo bxt_info = { + .type = INTEL_SPI_BXT, +}; + +static int intel_spi_pci_probe(struct pci_dev *pdev, + const struct pci_device_id *id) +{ + struct intel_spi_boardinfo *info; + struct intel_spi *ispi; + u32 bcr; + int ret; + + ret = pcim_enable_device(pdev); + if (ret) + return ret; + + info = devm_kmemdup(&pdev->dev, (void *)id->driver_data, sizeof(*info), + GFP_KERNEL); + if (!info) + return -ENOMEM; + + /* Try to make the chip read/write */ + pci_read_config_dword(pdev, BCR, &bcr); + if (!(bcr & BCR_WPD)) { + bcr |= BCR_WPD; + pci_write_config_dword(pdev, BCR, bcr); + pci_read_config_dword(pdev, BCR, &bcr); + } + info->writeable = !!(bcr & BCR_WPD); + + ispi = intel_spi_probe(&pdev->dev, &pdev->resource[0], info); + if (IS_ERR(ispi)) + return PTR_ERR(ispi); + + pci_set_drvdata(pdev, ispi); + return 0; +} + +static void intel_spi_pci_remove(struct pci_dev *pdev) +{ + intel_spi_remove(pci_get_drvdata(pdev)); +} + +static const struct pci_device_id intel_spi_pci_ids[] = { + { PCI_VDEVICE(INTEL, 0x19e0), (unsigned long)&bxt_info }, + { }, +}; +MODULE_DEVICE_TABLE(pci, intel_spi_pci_ids); + +static struct pci_driver intel_spi_pci_driver = { + .name = "intel-spi", + .id_table = intel_spi_pci_ids, + .probe = intel_spi_pci_probe, + .remove = intel_spi_pci_remove, +}; + +module_pci_driver(intel_spi_pci_driver); + +MODULE_DESCRIPTION("Intel PCH/PCU SPI flash PCI driver"); +MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>"); +MODULE_LICENSE("GPL v2"); |