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
macb_probe(struct pci_dev * pdev,const struct pci_device_id * id)28 static 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
99 err_plat_dev_register:
100 clk_unregister(plat_data.hclk);
101
102 err_hclk_register:
103 clk_unregister(plat_data.pclk);
104
105 err_pclk_register:
106 return err;
107 }
108
macb_remove(struct pci_dev * pdev)109 static 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
119 static const struct pci_device_id dev_id_table[] = {
120 { PCI_DEVICE(CDNS_VENDOR_ID, CDNS_DEVICE_ID), },
121 { 0, }
122 };
123
124 static 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
131 module_pci_driver(macb_pci_driver);
132 MODULE_DEVICE_TABLE(pci, dev_id_table);
133 MODULE_LICENSE("GPL");
134 MODULE_DESCRIPTION("Cadence NIC PCI wrapper");
135