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

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
...@@ -15,6 +15,15 @@ config DW_DMAC ...@@ -15,6 +15,15 @@ config DW_DMAC
Support the Synopsys DesignWare AHB DMA controller. This Support the Synopsys DesignWare AHB DMA controller. This
can be integrated in chips such as the Atmel AT32ap7000. 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 config DW_DMAC_BIG_ENDIAN_IO
bool "Use big endian I/O register access" bool "Use big endian I/O register access"
default y if AVR32 default y if AVR32
......
...@@ -3,3 +3,6 @@ dw_dmac_core-objs := core.o ...@@ -3,3 +3,6 @@ dw_dmac_core-objs := core.o
obj-$(CONFIG_DW_DMAC) += dw_dmac.o obj-$(CONFIG_DW_DMAC) += dw_dmac.o
dw_dmac-objs := platform.o dw_dmac-objs := platform.o
obj-$(CONFIG_DW_DMAC_PCI) += dw_dmac_pci.o
dw_dmac_pci-objs := pci.o
/*
* 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>");
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