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// SPDX-License-Identifier: GPL-2.0-only
/*
* 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.
*/
#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
#define PCI_DEVICE_ID_INTEL_MFLD_HSU_DMA 0x081e
#define PCI_DEVICE_ID_INTEL_MRFLD_HSU_DMA 0x1192
static irqreturn_t hsu_pci_irq(int irq, void *dev)
{
struct hsu_dma_chip *chip = dev;
u32 dmaisr;
u32 status;
unsigned short i;
int ret = 0;
int err;
dmaisr = readl(chip->regs + HSU_PCI_DMAISR);
for (i = 0; i < chip->hsu->nr_channels; i++) {
if (dmaisr & 0x1) {
err = hsu_dma_get_status(chip, i, &status);
if (err > 0)
ret |= 1;
else if (err == 0)
ret |= hsu_dma_do_irq(chip, i, status);
}
dmaisr >>= 1;
}
return IRQ_RETVAL(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;
ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
if (ret < 0)
return ret;
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 = pci_irq_vector(pdev, 0);
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;
/*
* On Intel Tangier B0 and Anniedale the interrupt line, disregarding
* to have different numbers, is shared between HSU DMA and UART IPs.
* Thus on such SoCs we are expecting that IRQ handler is called in
* UART driver only. Instead of handling the spurious interrupt
* from HSU DMA here and waste CPU time and delay HSU UART interrupt
* handling, disable the interrupt entirely.
*/
if (pdev->device == PCI_DEVICE_ID_INTEL_MRFLD_HSU_DMA)
disable_irq_nosync(chip->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, PCI_DEVICE_ID_INTEL_MFLD_HSU_DMA), 0 },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_MRFLD_HSU_DMA), 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>");
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