text: // SPDX-License-Identifier: GPL-2.0-only
  /**
   * DOC: Cadence GEM PCI wrapper.
   *
   * Copyright (C) 2016 Cadence Design Systems - https://www.cadence.com
   *
   * Authors: Rafal Ozieblo <rafalo@cadence.com>
   *	    Bartosz Folta <bfolta@cadence.com>
   */
  
  #include <linux/clk.h>
  #include <linux/clk-provider.h>
  #include <linux/etherdevice.h>
  #include <linux/module.h>
  #include <linux/pci.h>
  #include <linux/platform_device.h>
  #include "macb.h"
  
  #define PCI_DRIVER_NAME "macb_pci"
  #define PLAT_DRIVER_NAME "macb"
  
  #define CDNS_VENDOR_ID 0x17cd
  #define CDNS_DEVICE_ID 0xe007
  
  #define GEM_PCLK_RATE 50000000
  #define GEM_HCLK_RATE 50000000
  
  static int macb_probe(struct pci_dev *pdev, const struct pci_device_id *id)
  {
  	int err;
  	struct platform_device *plat_dev;
  	struct platform_device_info plat_info;
  	struct macb_platform_data plat_data;
  	struct resource res[2];
  
  	/* enable pci device */
  	err = pcim_enable_device(pdev);
  	if (err < 0) {
  		dev_err(&pdev->dev, "Enabling PCI device has failed: %d", err);
  		return err;
  	}
  
  	pci_set_master(pdev);
  
  	/* set up resources */
  	memset(res, 0x00, sizeof(struct resource) * ARRAY_SIZE(res));
  	res[0].start = pci_resource_start(pdev, 0);
  	res[0].end = pci_resource_end(pdev, 0);
  	res[0].name = PCI_DRIVER_NAME;
  	res[0].flags = IORESOURCE_MEM;
  	res[1].start = pci_irq_vector(pdev, 0);
  	res[1].name = PCI_DRIVER_NAME;
  	res[1].flags = IORESOURCE_IRQ;
  
  	dev_info(&pdev->dev, "EMAC physical base addr: %pa\n",
  		 &res[0].start);
  
  	/* set up macb platform data */
  	memset(&plat_data, 0, sizeof(plat_data));
  
  	/* initialize clocks */
  	plat_data.pclk = clk_register_fixed_rate(&pdev->dev, "pclk", NULL, 0,
  						 GEM_PCLK_RATE);
  	if (IS_ERR(plat_data.pclk)) {
  		err = PTR_ERR(plat_data.pclk);
  		goto err_pclk_register;
  	}
  
  	plat_data.hclk = clk_register_fixed_rate(&pdev->dev, "hclk", NULL, 0,
  						 GEM_HCLK_RATE);
  	if (IS_ERR(plat_data.hclk)) {
  		err = PTR_ERR(plat_data.hclk);
  		goto err_hclk_register;
  	}
  
  	/* set up platform device info */
  	memset(&plat_info, 0, sizeof(plat_info));
  	plat_info.parent = &pdev->dev;
  	plat_info.fwnode = pdev->dev.fwnode;
  	plat_info.name = PLAT_DRIVER_NAME;
  	plat_info.id = pdev->devfn;
  	plat_info.res = res;
  	plat_info.num_res = ARRAY_SIZE(res);
  	plat_info.data = &plat_data;
  	plat_info.size_data = sizeof(plat_data);
  	plat_info.dma_mask = pdev->dma_mask;
  
  	/* register platform device */
  	plat_dev = platform_device_register_full(&plat_info);
  	if (IS_ERR(plat_dev)) {
  		err = PTR_ERR(plat_dev);
  		goto err_plat_dev_register;
  	}
  
  	pci_set_drvdata(pdev, plat_dev);
  
  	return 0;
  
  err_plat_dev_register:
  	clk_unregister(plat_data.hclk);
  
  err_hclk_register:
  	clk_unregister(plat_data.pclk);
  
  err_pclk_register:
  	return err;
  }
  
  static void macb_remove(struct pci_dev *pdev)
  {
  	struct platform_device *plat_dev = pci_get_drvdata(pdev);
  	struct macb_platform_data *plat_data = dev_get_platdata(&plat_dev->dev);
  
  	platform_device_unregister(plat_dev);
  	clk_unregister(plat_data->pclk);
  	clk_unregister(plat_data->hclk);
  }
  
  static const struct pci_device_id dev_id_table[] = {
  	{ PCI_DEVICE(CDNS_VENDOR_ID, CDNS_DEVICE_ID), },
  	{ 0, }
  };
  
  static struct pci_driver macb_pci_driver = {
  	.name     = PCI_DRIVER_NAME,
  	.id_table = dev_id_table,
  	.probe    = macb_probe,
  	.remove	  = macb_remove,
  };
  
  module_pci_driver(macb_pci_driver);
  MODULE_DEVICE_TABLE(pci, dev_id_table);
  MODULE_LICENSE("GPL");
  MODULE_DESCRIPTION("Cadence NIC PCI wrapper");
  