1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * MEN Chameleon Bus.
  4 *
  5 * Copyright (C) 2014 MEN Mikroelektronik GmbH (www.men.de)
  6 * Author: Johannes Thumshirn <johannes.thumshirn@men.de>
  7 */
  8
  9#include <linux/module.h>
 10#include <linux/pci.h>
 11#include <linux/mcb.h>
 12
 13#include "mcb-internal.h"
 14
 15struct priv {
 16	struct mcb_bus *bus;
 17	phys_addr_t mapbase;
 18	void __iomem *base;
 19};
 20
 21static int mcb_pci_get_irq(struct mcb_device *mdev)
 22{
 23	struct mcb_bus *mbus = mdev->bus;
 24	struct device *dev = mbus->carrier;
 25	struct pci_dev *pdev = to_pci_dev(dev);
 26
 27	return pdev->irq;
 28}
 29
 30static int mcb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 31{
 32	struct resource *res;
 33	struct priv *priv;
 34	int ret;
 35	unsigned long flags;
 36
 37	priv = devm_kzalloc(&pdev->dev, sizeof(struct priv), GFP_KERNEL);
 38	if (!priv)
 39		return -ENOMEM;
 40
 41	ret = pci_enable_device(pdev);
 42	if (ret) {
 43		dev_err(&pdev->dev, "Failed to enable PCI device\n");
 44		return -ENODEV;
 45	}
 46	pci_set_master(pdev);
 47
 48	priv->mapbase = pci_resource_start(pdev, 0);
 49	if (!priv->mapbase) {
 50		dev_err(&pdev->dev, "No PCI resource\n");
 51		ret = -ENODEV;
 52		goto out_disable;
 53	}
 54
 55	res = devm_request_mem_region(&pdev->dev, priv->mapbase,
 56				      CHAM_HEADER_SIZE,
 57				      KBUILD_MODNAME);
 58	if (!res) {
 59		dev_err(&pdev->dev, "Failed to request PCI memory\n");
 60		ret = -EBUSY;
 61		goto out_disable;
 62	}
 63
 64	priv->base = devm_ioremap(&pdev->dev, priv->mapbase, CHAM_HEADER_SIZE);
 65	if (!priv->base) {
 66		dev_err(&pdev->dev, "Cannot ioremap\n");
 67		ret = -ENOMEM;
 68		goto out_disable;
 69	}
 70
 71	flags = pci_resource_flags(pdev, 0);
 72	if (flags & IORESOURCE_IO) {
 73		ret = -ENOTSUPP;
 74		dev_err(&pdev->dev,
 75			"IO mapped PCI devices are not supported\n");
 76		goto out_disable;
 77	}
 78
 79	pci_set_drvdata(pdev, priv);
 80
 81	priv->bus = mcb_alloc_bus(&pdev->dev);
 82	if (IS_ERR(priv->bus)) {
 83		ret = PTR_ERR(priv->bus);
 84		goto out_disable;
 85	}
 86
 87	priv->bus->get_irq = mcb_pci_get_irq;
 88
 89	ret = chameleon_parse_cells(priv->bus, priv->mapbase, priv->base);
 90	if (ret < 0)
 91		goto out_mcb_bus;
 92
 93	dev_dbg(&pdev->dev, "Found %d cells\n", ret);
 94
 95	mcb_bus_add_devices(priv->bus);
 96
 97	return 0;
 98
 99out_mcb_bus:
100	mcb_release_bus(priv->bus);
101out_disable:
102	pci_disable_device(pdev);
103	return ret;
104}
105
106static void mcb_pci_remove(struct pci_dev *pdev)
107{
108	struct priv *priv = pci_get_drvdata(pdev);
109
110	mcb_release_bus(priv->bus);
111
112	pci_disable_device(pdev);
113}
114
115static const struct pci_device_id mcb_pci_tbl[] = {
116	{ PCI_DEVICE(PCI_VENDOR_ID_MEN, PCI_DEVICE_ID_MEN_CHAMELEON) },
117	{ PCI_DEVICE(PCI_VENDOR_ID_ALTERA, PCI_DEVICE_ID_MEN_CHAMELEON) },
118	{ 0 },
119};
120MODULE_DEVICE_TABLE(pci, mcb_pci_tbl);
121
122static struct pci_driver mcb_pci_driver = {
123	.name = "mcb-pci",
124	.id_table = mcb_pci_tbl,
125	.probe = mcb_pci_probe,
126	.remove = mcb_pci_remove,
127};
128
129module_pci_driver(mcb_pci_driver);
130
131MODULE_AUTHOR("Johannes Thumshirn <johannes.thumshirn@men.de>");
132MODULE_LICENSE("GPL");
133MODULE_DESCRIPTION("MCB over PCI support");
134MODULE_IMPORT_NS(MCB);