4c97ad993d
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>
125 lines
2.7 KiB
C
125 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>");
|