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Commit fed42c19 authored by Andy Shevchenko's avatar Andy Shevchenko Committed by Vinod Koul
Browse files

dma: dw: add PCI part of the driver 



This is the PCI part of the DesignWare DMAC driver. The controller is usually
used in the Intel hardware such as Intel Medfield.

Signed-off-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
Acked-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
parent 9cade1a4

drivers/dma/dw/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -15,6 +15,15 @@ config DW_DMAC 
	  Support the Synopsys DesignWare AHB DMA controller. This

	  can be integrated in chips such as the Atmel AT32ap7000.



config DW_DMAC_PCI

	tristate "Synopsys DesignWare AHB DMA PCI driver"

	depends on PCI

	select DW_DMAC_CORE

	help

	  Support the Synopsys DesignWare AHB DMA controller on the

	  platfroms that enumerate it as a PCI device. For example,

	  Intel Medfield has integrated this GPDMA controller.



config DW_DMAC_BIG_ENDIAN_IO

	bool "Use big endian I/O register access"

	default y if AVR32

drivers/dma/dw/Makefile

+3 −0
Original line number Diff line number Diff line
@@ -3,3 +3,6 @@ dw_dmac_core-objs := core.o 


obj-$(CONFIG_DW_DMAC)		+= dw_dmac.o

dw_dmac-objs		:= platform.o



obj-$(CONFIG_DW_DMAC_PCI)	+= dw_dmac_pci.o

dw_dmac_pci-objs	:= pci.o

drivers/dma/dw/pci.c

0 → 100644
+101 −0
Original line number Diff line number Diff line 
/*

 * PCI driver for the Synopsys DesignWare DMA Controller

 *

 * Copyright (C) 2013 Intel Corporation

 * Author: Andy Shevchenko <andriy.shevchenko@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/module.h>

#include <linux/pci.h>

#include <linux/device.h>



#include "internal.h"



static struct dw_dma_platform_data dw_pci_pdata = {

	.is_private = 1,

	.chan_allocation_order = CHAN_ALLOCATION_ASCENDING,

	.chan_priority = CHAN_PRIORITY_ASCENDING,

};



static int dw_pci_probe(struct pci_dev *pdev, const struct pci_device_id *pid)

{

	struct dw_dma_chip *chip;

	struct dw_dma_platform_data *pdata = (void *)pid->driver_data;

	int ret;



	ret = pcim_enable_device(pdev);

	if (ret)

		return ret;



	ret = pcim_iomap_regions(pdev, 1 << 0, pci_name(pdev));

	if (ret) {

		dev_err(&pdev->dev, "I/O memory remapping failed\n");

		return ret;

	}



	pci_set_master(pdev);

	pci_try_set_mwi(pdev);



	ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));

	if (ret)

		return ret;



	ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));

	if (ret)

		return ret;



	chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);

	if (!chip)

		return -ENOMEM;



	chip->dev = &pdev->dev;

	chip->regs = pcim_iomap_table(pdev)[0];

	chip->irq = pdev->irq;



	ret = dw_dma_probe(chip, pdata);

	if (ret)

		return ret;



	pci_set_drvdata(pdev, chip);



	return 0;

}



static void dw_pci_remove(struct pci_dev *pdev)

{

	struct dw_dma_chip *chip = pci_get_drvdata(pdev);

	int ret;



	ret = dw_dma_remove(chip);

	if (ret)

		dev_warn(&pdev->dev, "can't remove device properly: %d\n", ret);

}



static DEFINE_PCI_DEVICE_TABLE(dw_pci_id_table) = {

	/* Medfield */

	{ PCI_VDEVICE(INTEL, 0x0827), (kernel_ulong_t)&dw_pci_pdata },

	{ PCI_VDEVICE(INTEL, 0x0830), (kernel_ulong_t)&dw_pci_pdata },



	/* BayTrail */

	{ PCI_VDEVICE(INTEL, 0x0f06), (kernel_ulong_t)&dw_pci_pdata },

	{ PCI_VDEVICE(INTEL, 0x0f40), (kernel_ulong_t)&dw_pci_pdata },

	{ }

};

MODULE_DEVICE_TABLE(pci, dw_pci_id_table);



static struct pci_driver dw_pci_driver = {

	.name		= "dw_dmac_pci",

	.id_table	= dw_pci_id_table,

	.probe		= dw_pci_probe,

	.remove		= dw_pci_remove,

};



module_pci_driver(dw_pci_driver);



MODULE_LICENSE("GPL v2");

MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller PCI driver");

MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");