1// SPDX-License-Identifier: GPL-2.0-only
  2/**
  3 * Cadence GEM PCI wrapper.
  4 *
  5 * Copyright (C) 2016 Cadence Design Systems - https://www.cadence.com
  6 *
  7 * Authors: Rafal Ozieblo <rafalo@cadence.com>
  8 *	    Bartosz Folta <bfolta@cadence.com>
  9 */
 10
 11#include <linux/clk.h>
 12#include <linux/clk-provider.h>
 13#include <linux/etherdevice.h>
 14#include <linux/module.h>
 15#include <linux/pci.h>
 16#include <linux/platform_data/macb.h>
 17#include <linux/platform_device.h>
 18#include "macb.h"
 19
 20#define PCI_DRIVER_NAME "macb_pci"
 21#define PLAT_DRIVER_NAME "macb"
 22
 23#define CDNS_VENDOR_ID 0x17cd
 24#define CDNS_DEVICE_ID 0xe007
 25
 26#define GEM_PCLK_RATE 50000000
 27#define GEM_HCLK_RATE 50000000
 28
 29static int macb_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 30{
 31	int err;
 32	struct platform_device *plat_dev;
 33	struct platform_device_info plat_info;
 34	struct macb_platform_data plat_data;
 35	struct resource res[2];
 36
 37	/* enable pci device */
 38	err = pcim_enable_device(pdev);
 39	if (err < 0) {
 40		dev_err(&pdev->dev, "Enabling PCI device has failed: %d", err);
 41		return err;
 42	}
 43
 44	pci_set_master(pdev);
 45
 46	/* set up resources */
 47	memset(res, 0x00, sizeof(struct resource) * ARRAY_SIZE(res));
 48	res[0].start = pci_resource_start(pdev, 0);
 49	res[0].end = pci_resource_end(pdev, 0);
 50	res[0].name = PCI_DRIVER_NAME;
 51	res[0].flags = IORESOURCE_MEM;
 52	res[1].start = pci_irq_vector(pdev, 0);
 53	res[1].name = PCI_DRIVER_NAME;
 54	res[1].flags = IORESOURCE_IRQ;
 55
 56	dev_info(&pdev->dev, "EMAC physical base addr: %pa\n",
 57		 &res[0].start);
 58
 59	/* set up macb platform data */
 60	memset(&plat_data, 0, sizeof(plat_data));
 61
 62	/* initialize clocks */
 63	plat_data.pclk = clk_register_fixed_rate(&pdev->dev, "pclk", NULL, 0,
 64						 GEM_PCLK_RATE);
 65	if (IS_ERR(plat_data.pclk)) {
 66		err = PTR_ERR(plat_data.pclk);
 67		goto err_pclk_register;
 68	}
 69
 70	plat_data.hclk = clk_register_fixed_rate(&pdev->dev, "hclk", NULL, 0,
 71						 GEM_HCLK_RATE);
 72	if (IS_ERR(plat_data.hclk)) {
 73		err = PTR_ERR(plat_data.hclk);
 74		goto err_hclk_register;
 75	}
 76
 77	/* set up platform device info */
 78	memset(&plat_info, 0, sizeof(plat_info));
 79	plat_info.parent = &pdev->dev;
 80	plat_info.fwnode = pdev->dev.fwnode;
 81	plat_info.name = PLAT_DRIVER_NAME;
 82	plat_info.id = pdev->devfn;
 83	plat_info.res = res;
 84	plat_info.num_res = ARRAY_SIZE(res);
 85	plat_info.data = &plat_data;
 86	plat_info.size_data = sizeof(plat_data);
 87	plat_info.dma_mask = pdev->dma_mask;
 88
 89	/* register platform device */
 90	plat_dev = platform_device_register_full(&plat_info);
 91	if (IS_ERR(plat_dev)) {
 92		err = PTR_ERR(plat_dev);
 93		goto err_plat_dev_register;
 94	}
 95
 96	pci_set_drvdata(pdev, plat_dev);
 97
 98	return 0;
 99
100err_plat_dev_register:
101	clk_unregister(plat_data.hclk);
102
103err_hclk_register:
104	clk_unregister(plat_data.pclk);
105
106err_pclk_register:
107	return err;
108}
109
110static void macb_remove(struct pci_dev *pdev)
111{
112	struct platform_device *plat_dev = pci_get_drvdata(pdev);
113	struct macb_platform_data *plat_data = dev_get_platdata(&plat_dev->dev);
114
115	platform_device_unregister(plat_dev);
116	clk_unregister(plat_data->pclk);
117	clk_unregister(plat_data->hclk);
118}
119
120static const struct pci_device_id dev_id_table[] = {
121	{ PCI_DEVICE(CDNS_VENDOR_ID, CDNS_DEVICE_ID), },
122	{ 0, }
123};
124
125static struct pci_driver macb_pci_driver = {
126	.name     = PCI_DRIVER_NAME,
127	.id_table = dev_id_table,
128	.probe    = macb_probe,
129	.remove	  = macb_remove,
130};
131
132module_pci_driver(macb_pci_driver);
133MODULE_DEVICE_TABLE(pci, dev_id_table);
134MODULE_LICENSE("GPL");
135MODULE_DESCRIPTION("Cadence NIC PCI wrapper");