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