[PATCH] spi-nor: intel-spi: Add support for Intel Denverton SPI serial flash controller

[Cyrille Pitchen]

Le 29/06/2017 à 13:45, Mika Westerberg a écrit :
> Intel Denverton exposes the SPI serial flash controller as a PCI device
> instead of being part of the LPC chip as previous generations did.
> 
> Signed-off-by: Mika Westerberg <mika.westerberg at linux.intel.com>

applied to the spi-nor/next branch of l2-mtd

just few little changes:
- prepend "mtd: " in the subject line of the patch
- reorder *_SPI_PCI before *_SPI_PLATFORM in Kconfig and Makefile

Best regards,

Cyrille

> ---
>  drivers/mtd/spi-nor/Kconfig         | 16 ++++++++
>  drivers/mtd/spi-nor/Makefile        |  3 +-
>  drivers/mtd/spi-nor/intel-spi-pci.c | 82 +++++++++++++++++++++++++++++++++++++
>  3 files changed, 100 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/mtd/spi-nor/intel-spi-pci.c
> 
> diff --git a/drivers/mtd/spi-nor/Kconfig b/drivers/mtd/spi-nor/Kconfig
> index bfdfb1e72b38..8cc9b4070d9e 100644
> --- a/drivers/mtd/spi-nor/Kconfig
> +++ b/drivers/mtd/spi-nor/Kconfig
> @@ -106,6 +106,22 @@ config SPI_INTEL_SPI_PLATFORM
>  	  To compile this driver as a module, choose M here: the module
>  	  will be called intel-spi-platform.
>  
> +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_STM32_QUADSPI
>  	tristate "STM32 Quad SPI controller"
>  	depends on ARCH_STM32
> diff --git a/drivers/mtd/spi-nor/Makefile b/drivers/mtd/spi-nor/Makefile
> index 285aab86c7ca..92695f2eb7ae 100644
> --- a/drivers/mtd/spi-nor/Makefile
> +++ b/drivers/mtd/spi-nor/Makefile
> @@ -8,4 +8,5 @@ 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_PLATFORM)	+= intel-spi-platform.o
> -obj-$(CONFIG_SPI_STM32_QUADSPI)	+= stm32-quadspi.o
> \ No newline at end of file
> +obj-$(CONFIG_SPI_INTEL_SPI_PCI)	+= intel-spi-pci.o
> +obj-$(CONFIG_SPI_STM32_QUADSPI)	+= stm32-quadspi.o
> 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 at 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 at linux.intel.com>");
> +MODULE_LICENSE("GPL v2");
>