// SPDX-License-Identifier: GPL-2.0-only

  /*
   * MEN Chameleon Bus.
   *
   * Copyright (C) 2014 MEN Mikroelektronik GmbH (www.men.de)
   * Author: Johannes Thumshirn <johannes.thumshirn@men.de>

   */
  
  #include <linux/module.h>
  #include <linux/pci.h>
  #include <linux/mcb.h>
  
  #include "mcb-internal.h"
  
  struct priv {
  	struct mcb_bus *bus;

  	phys_addr_t mapbase;

  	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 resource *res;

  	struct priv *priv;

  	int ret;

  	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
  ");
  		return -ENODEV;
  	}

  	pci_set_master(pdev);

  	priv->mapbase = pci_resource_start(pdev, 0);
  	if (!priv->mapbase) {

  		dev_err(&pdev->dev, "No PCI resource
  ");

  		ret = -ENODEV;

  		goto out_disable;

  	}

  	res = devm_request_mem_region(&pdev->dev, priv->mapbase,
  				      CHAM_HEADER_SIZE,
  				      KBUILD_MODNAME);

  	if (!res) {

  		dev_err(&pdev->dev, "Failed to request PCI memory
  ");

  		ret = -EBUSY;

  		goto out_disable;

  	}

  	priv->base = devm_ioremap(&pdev->dev, priv->mapbase, CHAM_HEADER_SIZE);

  	if (!priv->base) {
  		dev_err(&pdev->dev, "Cannot ioremap
  ");
  		ret = -ENOMEM;

  		goto out_disable;

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

  		goto out_disable;

  	}
  
  	pci_set_drvdata(pdev, priv);

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

  		goto out_disable;

  	}
  
  	priv->bus->get_irq = mcb_pci_get_irq;

  	ret = chameleon_parse_cells(priv->bus, priv->mapbase, priv->base);

  	if (ret < 0)

  		goto out_mcb_bus;

  	dev_dbg(&pdev->dev, "Found %d cells
  ", ret);

  
  	mcb_bus_add_devices(priv->bus);

  	return 0;

  out_mcb_bus:
  	mcb_release_bus(priv->bus);

  out_disable:

  	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);

  	pci_disable_device(pdev);

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

  	{ PCI_DEVICE(PCI_VENDOR_ID_ALTERA, 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");