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15bb81d334
In order to successfully perform DMA operations on PCI devices, it is necessary to enble PCI bus mastering, so enable it by default. Signed-off-by: Michael Moese <michael.moese@men.de> Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
136 lines
2.9 KiB
C
136 lines
2.9 KiB
C
/*
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* MEN Chameleon Bus.
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*
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* Copyright (C) 2014 MEN Mikroelektronik GmbH (www.men.de)
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* Author: Johannes Thumshirn <johannes.thumshirn@men.de>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; version 2 of the License.
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*/
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/mcb.h>
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#include "mcb-internal.h"
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struct priv {
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struct mcb_bus *bus;
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phys_addr_t mapbase;
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void __iomem *base;
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};
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static int mcb_pci_get_irq(struct mcb_device *mdev)
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{
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struct mcb_bus *mbus = mdev->bus;
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struct device *dev = mbus->carrier;
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struct pci_dev *pdev = to_pci_dev(dev);
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return pdev->irq;
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}
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static int mcb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
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{
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struct resource *res;
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struct priv *priv;
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int ret;
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unsigned long flags;
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priv = devm_kzalloc(&pdev->dev, sizeof(struct priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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ret = pci_enable_device(pdev);
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if (ret) {
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dev_err(&pdev->dev, "Failed to enable PCI device\n");
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return -ENODEV;
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}
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pci_set_master(pdev);
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priv->mapbase = pci_resource_start(pdev, 0);
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if (!priv->mapbase) {
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dev_err(&pdev->dev, "No PCI resource\n");
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ret = -ENODEV;
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goto out_disable;
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}
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res = devm_request_mem_region(&pdev->dev, priv->mapbase,
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CHAM_HEADER_SIZE,
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KBUILD_MODNAME);
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if (!res) {
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dev_err(&pdev->dev, "Failed to request PCI memory\n");
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ret = -EBUSY;
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goto out_disable;
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}
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priv->base = devm_ioremap(&pdev->dev, priv->mapbase, CHAM_HEADER_SIZE);
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if (!priv->base) {
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dev_err(&pdev->dev, "Cannot ioremap\n");
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ret = -ENOMEM;
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goto out_disable;
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}
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flags = pci_resource_flags(pdev, 0);
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if (flags & IORESOURCE_IO) {
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ret = -ENOTSUPP;
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dev_err(&pdev->dev,
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"IO mapped PCI devices are not supported\n");
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goto out_disable;
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}
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pci_set_drvdata(pdev, priv);
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priv->bus = mcb_alloc_bus(&pdev->dev);
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if (IS_ERR(priv->bus)) {
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ret = PTR_ERR(priv->bus);
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goto out_disable;
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}
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priv->bus->get_irq = mcb_pci_get_irq;
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ret = chameleon_parse_cells(priv->bus, priv->mapbase, priv->base);
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if (ret < 0)
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goto out_mcb_bus;
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dev_dbg(&pdev->dev, "Found %d cells\n", ret);
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mcb_bus_add_devices(priv->bus);
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return 0;
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out_mcb_bus:
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mcb_release_bus(priv->bus);
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out_disable:
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pci_disable_device(pdev);
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return ret;
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}
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static void mcb_pci_remove(struct pci_dev *pdev)
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{
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struct priv *priv = pci_get_drvdata(pdev);
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mcb_release_bus(priv->bus);
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pci_disable_device(pdev);
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}
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static const struct pci_device_id mcb_pci_tbl[] = {
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{ PCI_DEVICE(PCI_VENDOR_ID_MEN, PCI_DEVICE_ID_MEN_CHAMELEON) },
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{ 0 },
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};
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MODULE_DEVICE_TABLE(pci, mcb_pci_tbl);
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static struct pci_driver mcb_pci_driver = {
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.name = "mcb-pci",
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.id_table = mcb_pci_tbl,
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.probe = mcb_pci_probe,
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.remove = mcb_pci_remove,
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};
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module_pci_driver(mcb_pci_driver);
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MODULE_AUTHOR("Johannes Thumshirn <johannes.thumshirn@men.de>");
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("MCB over PCI support");
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