linux-stable/drivers/dma/hsu/pci.c
Heikki Krogerus 4c97ad993d dmaengine: hsu: remove platform data
There are no platforms where it's not possible to calculate
the number of channels based on IO space length, and since
that is the only purpose for struct hsu_dma_platform_data,
removing it.

Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-10-17 21:22:08 -07:00

124 lines
2.7 KiB
C

/*
* PCI driver for the High Speed UART DMA
*
* Copyright (C) 2015 Intel Corporation
* Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
*
* Partially based on the bits found in drivers/tty/serial/mfd.c.
*
* 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/bitops.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/pci.h>
#include "hsu.h"
#define HSU_PCI_DMASR 0x00
#define HSU_PCI_DMAISR 0x04
#define HSU_PCI_CHAN_OFFSET 0x100
static irqreturn_t hsu_pci_irq(int irq, void *dev)
{
struct hsu_dma_chip *chip = dev;
u32 dmaisr;
unsigned short i;
irqreturn_t ret = IRQ_NONE;
dmaisr = readl(chip->regs + HSU_PCI_DMAISR);
for (i = 0; i < chip->hsu->nr_channels; i++) {
if (dmaisr & 0x1)
ret |= hsu_dma_irq(chip, i);
dmaisr >>= 1;
}
return ret;
}
static int hsu_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
struct hsu_dma_chip *chip;
int ret;
ret = pcim_enable_device(pdev);
if (ret)
return ret;
ret = pcim_iomap_regions(pdev, BIT(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->length = pci_resource_len(pdev, 0);
chip->offset = HSU_PCI_CHAN_OFFSET;
chip->irq = pdev->irq;
pci_enable_msi(pdev);
ret = hsu_dma_probe(chip);
if (ret)
return ret;
ret = request_irq(chip->irq, hsu_pci_irq, 0, "hsu_dma_pci", chip);
if (ret)
goto err_register_irq;
pci_set_drvdata(pdev, chip);
return 0;
err_register_irq:
hsu_dma_remove(chip);
return ret;
}
static void hsu_pci_remove(struct pci_dev *pdev)
{
struct hsu_dma_chip *chip = pci_get_drvdata(pdev);
free_irq(chip->irq, chip);
hsu_dma_remove(chip);
}
static const struct pci_device_id hsu_pci_id_table[] = {
{ PCI_VDEVICE(INTEL, 0x081e), 0 },
{ PCI_VDEVICE(INTEL, 0x1192), 0 },
{ }
};
MODULE_DEVICE_TABLE(pci, hsu_pci_id_table);
static struct pci_driver hsu_pci_driver = {
.name = "hsu_dma_pci",
.id_table = hsu_pci_id_table,
.probe = hsu_pci_probe,
.remove = hsu_pci_remove,
};
module_pci_driver(hsu_pci_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("High Speed UART DMA PCI driver");
MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");