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mtd: spi-nor: intel-spi: Add support for Intel Denverton SPI serial flash controller

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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>
This commit is contained in:
Mika Westerberg
2017-06-29 14:45:42 +03:00
committed by Cyrille Pitchen
parent f384b352cb
commit fe602838a6
3 changed files with 99 additions and 0 deletions
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82
drivers/mtd/spi-nor/intel-spi-pci.c Normal file
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/*
* 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");