[linux-2.6-block.git] / drivers / dma / hsu / pci.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;
	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;

	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>");
Commit	Line	Data
2b49e0c5 AS	1	/*
	2	* PCI driver for the High Speed UART DMA
	3	*
	4	* Copyright (C) 2015 Intel Corporation
	5	* Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
	6	*
	7	* Partially based on the bits found in drivers/tty/serial/mfd.c.
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License version 2 as
	11	* published by the Free Software Foundation.
	12	*/
	13
	14	#include <linux/bitops.h>
	15	#include <linux/device.h>
	16	#include <linux/module.h>
	17	#include <linux/pci.h>
	18
	19	#include "hsu.h"
	20
	21	#define HSU_PCI_DMASR 0x00
	22	#define HSU_PCI_DMAISR 0x04
	23
	24	#define HSU_PCI_CHAN_OFFSET 0x100
	25
	26	static irqreturn_t hsu_pci_irq(int irq, void *dev)
	27	{
	28	struct hsu_dma_chip *chip = dev;
	29	u32 dmaisr;
c6f82787	30	u32 status;
2b49e0c5	31	unsigned short i;
d2f5a731	32	int ret = 0;
c6f82787	33	int err;
2b49e0c5 AS	34
2b49e0c5 AS	35	dmaisr = readl(chip->regs + HSU_PCI_DMAISR);
4c97ad99	36	for (i = 0; i < chip->hsu->nr_channels; i++) {
c6f82787 CKT	37	if (dmaisr & 0x1) {
	38	err = hsu_dma_get_status(chip, i, &status);
	39	if (err > 0)
d2f5a731	40	ret \|= 1;
c6f82787 CKT	41	else if (err == 0)
	42	ret \|= hsu_dma_do_irq(chip, i, status);
	43	}
2b49e0c5 AS	44	dmaisr >>= 1;
	45	}
	46
d2f5a731	47	return IRQ_RETVAL(ret);
2b49e0c5 AS	48	}
	49
	50	static int hsu_pci_probe(struct pci_dev pdev, const struct pci_device_id id)
	51	{
	52	struct hsu_dma_chip *chip;
	53	int ret;
	54
	55	ret = pcim_enable_device(pdev);
	56	if (ret)
	57	return ret;
	58
	59	ret = pcim_iomap_regions(pdev, BIT(0), pci_name(pdev));
	60	if (ret) {
	61	dev_err(&pdev->dev, "I/O memory remapping failed\n");
	62	return ret;
	63	}
	64
	65	pci_set_master(pdev);
	66	pci_try_set_mwi(pdev);
	67
	68	ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
	69	if (ret)
	70	return ret;
	71
	72	ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
	73	if (ret)
	74	return ret;
	75
	76	chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
	77	if (!chip)
	78	return -ENOMEM;
	79
	80	chip->dev = &pdev->dev;
	81	chip->regs = pcim_iomap_table(pdev)[0];
	82	chip->length = pci_resource_len(pdev, 0);
	83	chip->offset = HSU_PCI_CHAN_OFFSET;
	84	chip->irq = pdev->irq;
	85
	86	pci_enable_msi(pdev);
	87
	88	ret = hsu_dma_probe(chip);
	89	if (ret)
	90	return ret;
	91
	92	ret = request_irq(chip->irq, hsu_pci_irq, 0, "hsu_dma_pci", chip);
	93	if (ret)
	94	goto err_register_irq;
	95
	96	pci_set_drvdata(pdev, chip);
	97
	98	return 0;
	99
	100	err_register_irq:
	101	hsu_dma_remove(chip);
	102	return ret;
	103	}
	104
	105	static void hsu_pci_remove(struct pci_dev *pdev)
	106	{
	107	struct hsu_dma_chip *chip = pci_get_drvdata(pdev);
	108
	109	free_irq(chip->irq, chip);
	110	hsu_dma_remove(chip);
	111	}
112
113	static const struct pci_device_id hsu_pci_id_table[] = {
114	{ PCI_VDEVICE(INTEL, 0x081e), 0 },
594eb4a4	115	{ PCI_VDEVICE(INTEL, 0x1192), 0 },
2b49e0c5 AS	116	{ }
	117	};
	118	MODULE_DEVICE_TABLE(pci, hsu_pci_id_table);
	119
	120	static struct pci_driver hsu_pci_driver = {
	121	.name = "hsu_dma_pci",
	122	.id_table = hsu_pci_id_table,
	123	.probe = hsu_pci_probe,
	124	.remove = hsu_pci_remove,
	125	};
	126
	127	module_pci_driver(hsu_pci_driver);
	128
	129	MODULE_LICENSE("GPL v2");
	130	MODULE_DESCRIPTION("High Speed UART DMA PCI driver");
	131	MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>");