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
 18struct priv {
 19	struct mcb_bus *bus;
 20	phys_addr_t mapbase;
 21	void __iomem *base;
 22};
 23
 24static int mcb_pci_get_irq(struct mcb_device *mdev)
 25{
 26	struct mcb_bus *mbus = mdev->bus;
 27	struct device *dev = mbus->carrier;
 28	struct pci_dev *pdev = to_pci_dev(dev);
 29
 30	return pdev->irq;
 31}
 32
 33static int mcb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 34{
 35	struct resource *res;
 36	struct priv *priv;
 37	int ret;
 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	pci_set_master(pdev);
 50
 51	priv->mapbase = pci_resource_start(pdev, 0);
 52	if (!priv->mapbase) {
 53		dev_err(&pdev->dev, "No PCI resource\n");
 54		ret = -ENODEV;
 55		goto out_disable;
 56	}
 57
 58	res = devm_request_mem_region(&pdev->dev, priv->mapbase,
 59				      CHAM_HEADER_SIZE,
 60				      KBUILD_MODNAME);
 61	if (!res) {
 62		dev_err(&pdev->dev, "Failed to request PCI memory\n");
 63		ret = -EBUSY;
 64		goto out_disable;
 65	}
 66
 67	priv->base = devm_ioremap(&pdev->dev, priv->mapbase, CHAM_HEADER_SIZE);
 68	if (!priv->base) {
 69		dev_err(&pdev->dev, "Cannot ioremap\n");
 70		ret = -ENOMEM;
 71		goto out_disable;
 72	}
 73
 74	flags = pci_resource_flags(pdev, 0);
 75	if (flags & IORESOURCE_IO) {
 76		ret = -ENOTSUPP;
 77		dev_err(&pdev->dev,
 78			"IO mapped PCI devices are not supported\n");
 79		goto out_disable;
 80	}
 81
 82	pci_set_drvdata(pdev, priv);
 83
 84	priv->bus = mcb_alloc_bus(&pdev->dev);
 85	if (IS_ERR(priv->bus)) {
 86		ret = PTR_ERR(priv->bus);
 87		goto out_disable;
 88	}
 89
 90	priv->bus->get_irq = mcb_pci_get_irq;
 91
 92	ret = chameleon_parse_cells(priv->bus, priv->mapbase, priv->base);
 93	if (ret < 0)
 94		goto out_mcb_bus;
 95
 96	dev_dbg(&pdev->dev, "Found %d cells\n", ret);
 97
 98	mcb_bus_add_devices(priv->bus);
 99
100	return 0;
101
102out_mcb_bus:
103	mcb_release_bus(priv->bus);
104out_disable:
105	pci_disable_device(pdev);
106	return ret;
107}
108
109static void mcb_pci_remove(struct pci_dev *pdev)
110{
111	struct priv *priv = pci_get_drvdata(pdev);
112
113	mcb_release_bus(priv->bus);
114
115	pci_disable_device(pdev);
116}
117
118static const struct pci_device_id mcb_pci_tbl[] = {
119	{ PCI_DEVICE(PCI_VENDOR_ID_MEN, PCI_DEVICE_ID_MEN_CHAMELEON) },
120	{ 0 },
121};
122MODULE_DEVICE_TABLE(pci, mcb_pci_tbl);
123
124static struct pci_driver mcb_pci_driver = {
125	.name = "mcb-pci",
126	.id_table = mcb_pci_tbl,
127	.probe = mcb_pci_probe,
128	.remove = mcb_pci_remove,
129};
130
131module_pci_driver(mcb_pci_driver);
132
133MODULE_AUTHOR("Johannes Thumshirn <johannes.thumshirn@men.de>");
134MODULE_LICENSE("GPL");
135MODULE_DESCRIPTION("MCB over PCI support");