[mirror_ubuntu-bionic-kernel.git] / drivers / mcb / mcb-pci.c

/*
 * MEN Chameleon Bus.
 *
 * Copyright (C) 2014 MEN Mikroelektronik GmbH (www.men.de)
 * Author: Johannes Thumshirn <johannes.thumshirn@men.de>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; version 2 of the License.
 */

#include <linux/module.h>
#include <linux/pci.h>
#include <linux/mcb.h>

#include "mcb-internal.h"

struct priv {
	struct mcb_bus *bus;
	void __iomem *base;
};

static int mcb_pci_get_irq(struct mcb_device *mdev)
{
	struct mcb_bus *mbus = mdev->bus;
	struct device *dev = mbus->carrier;
	struct pci_dev *pdev = to_pci_dev(dev);

	return pdev->irq;
}

static int mcb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
	struct priv *priv;
	phys_addr_t mapbase;
	int ret;
	int num_cells;
	unsigned long flags;

	priv = devm_kzalloc(&pdev->dev, sizeof(struct priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	ret = pci_enable_device(pdev);
	if (ret) {
		dev_err(&pdev->dev, "Failed to enable PCI device\n");
		return -ENODEV;
	}

	mapbase = pci_resource_start(pdev, 0);
	if (!mapbase) {
		dev_err(&pdev->dev, "No PCI resource\n");
		goto err_start;
	}

	ret = pci_request_region(pdev, 0, KBUILD_MODNAME);
	if (ret) {
		dev_err(&pdev->dev, "Failed to request PCI BARs\n");
		goto err_start;
	}

	priv->base = pci_iomap(pdev, 0, 0);
	if (!priv->base) {
		dev_err(&pdev->dev, "Cannot ioremap\n");
		ret = -ENOMEM;
		goto err_ioremap;
	}

	flags = pci_resource_flags(pdev, 0);
	if (flags & IORESOURCE_IO) {
		ret = -ENOTSUPP;
		dev_err(&pdev->dev,
			"IO mapped PCI devices are not supported\n");
		goto err_ioremap;
	}

	pci_set_drvdata(pdev, priv);

	priv->bus = mcb_alloc_bus(&pdev->dev);
	if (IS_ERR(priv->bus)) {
		ret = PTR_ERR(priv->bus);
		goto err_drvdata;
	}

	priv->bus->get_irq = mcb_pci_get_irq;

	ret = chameleon_parse_cells(priv->bus, mapbase, priv->base);
	if (ret < 0)
		goto err_drvdata;
	num_cells = ret;

	dev_dbg(&pdev->dev, "Found %d cells\n", num_cells);

	mcb_bus_add_devices(priv->bus);

err_drvdata:
	pci_iounmap(pdev, priv->base);
err_ioremap:
	pci_release_region(pdev, 0);
err_start:
	pci_disable_device(pdev);
	return ret;
}

static void mcb_pci_remove(struct pci_dev *pdev)
{
	struct priv *priv = pci_get_drvdata(pdev);

	mcb_release_bus(priv->bus);
}

static const struct pci_device_id mcb_pci_tbl[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_MEN, PCI_DEVICE_ID_MEN_CHAMELEON) },
	{ 0 },
};
MODULE_DEVICE_TABLE(pci, mcb_pci_tbl);

static struct pci_driver mcb_pci_driver = {
	.name = "mcb-pci",
	.id_table = mcb_pci_tbl,
	.probe = mcb_pci_probe,
	.remove = mcb_pci_remove,
};

module_pci_driver(mcb_pci_driver);

MODULE_AUTHOR("Johannes Thumshirn <johannes.thumshirn@men.de>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("MCB over PCI support");
Commit	Line	Data
b71bb863 JT	1	/*
	2	* MEN Chameleon Bus.
	3	*
	4	* Copyright (C) 2014 MEN Mikroelektronik GmbH (www.men.de)
	5	* Author: Johannes Thumshirn <johannes.thumshirn@men.de>
	6	*
	7	* This program is free software; you can redistribute it and/or modify it
	8	* under the terms of the GNU General Public License as published by the Free
	9	* Software Foundation; version 2 of the License.
	10	*/
	11
	12	#include <linux/module.h>
	13	#include <linux/pci.h>
	14	#include <linux/mcb.h>
	15
	16	#include "mcb-internal.h"
	17
	18	struct priv {
	19	struct mcb_bus *bus;
	20	void __iomem *base;
	21	};
	22
4ec65b77 JT	23	static int mcb_pci_get_irq(struct mcb_device *mdev)
	24	{
	25	struct mcb_bus *mbus = mdev->bus;
	26	struct device *dev = mbus->carrier;
	27	struct pci_dev *pdev = to_pci_dev(dev);
	28
	29	return pdev->irq;
	30	}
	31
b71bb863 JT	32	static int mcb_pci_probe(struct pci_dev pdev, const struct pci_device_id id)
	33	{
	34	struct priv *priv;
	35	phys_addr_t mapbase;
	36	int ret;
	37	int num_cells;
	38	unsigned long flags;
	39
	40	priv = devm_kzalloc(&pdev->dev, sizeof(struct priv), GFP_KERNEL);
	41	if (!priv)
	42	return -ENOMEM;
	43
	44	ret = pci_enable_device(pdev);
	45	if (ret) {
	46	dev_err(&pdev->dev, "Failed to enable PCI device\n");
	47	return -ENODEV;
	48	}
	49
	50	mapbase = pci_resource_start(pdev, 0);
	51	if (!mapbase) {
	52	dev_err(&pdev->dev, "No PCI resource\n");
	53	goto err_start;
	54	}
	55
	56	ret = pci_request_region(pdev, 0, KBUILD_MODNAME);
	57	if (ret) {
	58	dev_err(&pdev->dev, "Failed to request PCI BARs\n");
	59	goto err_start;
	60	}
	61
	62	priv->base = pci_iomap(pdev, 0, 0);
	63	if (!priv->base) {
	64	dev_err(&pdev->dev, "Cannot ioremap\n");
	65	ret = -ENOMEM;
	66	goto err_ioremap;
	67	}
	68
	69	flags = pci_resource_flags(pdev, 0);
	70	if (flags & IORESOURCE_IO) {
	71	ret = -ENOTSUPP;
	72	dev_err(&pdev->dev,
	73	"IO mapped PCI devices are not supported\n");
	74	goto err_ioremap;
	75	}
	76
	77	pci_set_drvdata(pdev, priv);
	78
4ec65b77 JT	79	priv->bus = mcb_alloc_bus(&pdev->dev);
	80	if (IS_ERR(priv->bus)) {
	81	ret = PTR_ERR(priv->bus);
	82	goto err_drvdata;
	83	}
	84
	85	priv->bus->get_irq = mcb_pci_get_irq;
b71bb863 JT	86
	87	ret = chameleon_parse_cells(priv->bus, mapbase, priv->base);
	88	if (ret < 0)
	89	goto err_drvdata;
	90	num_cells = ret;
	91
	92	dev_dbg(&pdev->dev, "Found %d cells\n", num_cells);
	93
	94	mcb_bus_add_devices(priv->bus);
	95
	96	err_drvdata:
	97	pci_iounmap(pdev, priv->base);
	98	err_ioremap:
	99	pci_release_region(pdev, 0);
	100	err_start:
	101	pci_disable_device(pdev);
	102	return ret;
	103	}
	104
	105	static void mcb_pci_remove(struct pci_dev *pdev)
	106	{
	107	struct priv *priv = pci_get_drvdata(pdev);
	108
	109	mcb_release_bus(priv->bus);
	110	}
	111
	112	static const struct pci_device_id mcb_pci_tbl[] = {
	113	{ PCI_DEVICE(PCI_VENDOR_ID_MEN, PCI_DEVICE_ID_MEN_CHAMELEON) },
	114	{ 0 },
	115	};
	116	MODULE_DEVICE_TABLE(pci, mcb_pci_tbl);
	117
	118	static struct pci_driver mcb_pci_driver = {
	119	.name = "mcb-pci",
	120	.id_table = mcb_pci_tbl,
	121	.probe = mcb_pci_probe,
	122	.remove = mcb_pci_remove,
	123	};
	124
	125	module_pci_driver(mcb_pci_driver);
	126
	127	MODULE_AUTHOR("Johannes Thumshirn <johannes.thumshirn@men.de>");
	128	MODULE_LICENSE("GPL");
	129	MODULE_DESCRIPTION("MCB over PCI support");