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author | Mika Westerberg <mika.westerberg@linux.intel.com> | 2017-06-29 14:45:42 +0300 |
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committer | Cyrille Pitchen <cyrille.pitchen@free-electrons.com> | 2017-08-01 19:19:28 +0200 |
commit | fe602838a66d34f3d1de71feab92b403e244db8c (patch) | |
tree | d6f88a160190e6a46230b299434170995b98d6d0 /drivers/mtd/spi-nor/intel-spi-pci.c | |
parent | f384b352cbf0310fd20c379c4710408c70e769b6 (diff) | |
download | lwn-fe602838a66d34f3d1de71feab92b403e244db8c.tar.gz lwn-fe602838a66d34f3d1de71feab92b403e244db8c.zip |
mtd: spi-nor: intel-spi: Add support for Intel Denverton SPI serial flash controller
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@linux.intel.com>
Signed-off-by: Cyrille Pitchen <cyrille.pitchen@free-electrons.com>
Diffstat (limited to 'drivers/mtd/spi-nor/intel-spi-pci.c')
-rw-r--r-- | drivers/mtd/spi-nor/intel-spi-pci.c | 82 |
1 files changed, 82 insertions, 0 deletions
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"); |