From: Mika Westerberg <mika.westerb...@linux.intel.com>
Commit fe602838a66d34f3d1de71feab92b403e244db8c upstream
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.westerb...@linux.intel.com>
Signed-off-by: Cyrille Pitchen <cyrille.pitc...@free-electrons.com>
---
drivers/mtd/spi-nor/Kconfig | 16 ++++++++
drivers/mtd/spi-nor/Makefile | 1 +
drivers/mtd/spi-nor/intel-spi-pci.c | 82 +++++++++++++++++++++++++++++++++++++
3 files changed, 99 insertions(+)
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 bfdfb1e..5f6892d 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 285aab8..c5f171d 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 0000000..e826523
--- /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.westerb...@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.westerb...@linux.intel.com>");
+MODULE_LICENSE("GPL v2");
--
1.9.1
--
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