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");
135