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