1 /**
2  * Cadence GEM PCI wrapper.
3  *
4  * Copyright (C) 2016 Cadence Design Systems - http://www.cadence.com
5  *
6  * Authors: Rafal Ozieblo <rafalo@cadence.com>
7  *	    Bartosz Folta <bfolta@cadence.com>
8  *
9  * This program is free software: you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License version 2  of
11  * the License as published by the Free Software Foundation.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
20  */
21 
22 #include <linux/clk.h>
23 #include <linux/clk-provider.h>
24 #include <linux/etherdevice.h>
25 #include <linux/module.h>
26 #include <linux/pci.h>
27 #include <linux/platform_data/macb.h>
28 #include <linux/platform_device.h>
29 #include "macb.h"
30 
31 #define PCI_DRIVER_NAME "macb_pci"
32 #define PLAT_DRIVER_NAME "macb"
33 
34 #define CDNS_VENDOR_ID 0x17cd
35 #define CDNS_DEVICE_ID 0xe007
36 
37 #define GEM_PCLK_RATE 50000000
38 #define GEM_HCLK_RATE 50000000
39 
40 static int macb_probe(struct pci_dev *pdev, const struct pci_device_id *id)
41 {
42 	int err;
43 	struct platform_device *plat_dev;
44 	struct platform_device_info plat_info;
45 	struct macb_platform_data plat_data;
46 	struct resource res[2];
47 
48 	/* enable pci device */
49 	err = pcim_enable_device(pdev);
50 	if (err < 0) {
51 		dev_err(&pdev->dev, "Enabling PCI device has failed: %d", err);
52 		return err;
53 	}
54 
55 	pci_set_master(pdev);
56 
57 	/* set up resources */
58 	memset(res, 0x00, sizeof(struct resource) * ARRAY_SIZE(res));
59 	res[0].start = pci_resource_start(pdev, 0);
60 	res[0].end = pci_resource_end(pdev, 0);
61 	res[0].name = PCI_DRIVER_NAME;
62 	res[0].flags = IORESOURCE_MEM;
63 	res[1].start = pci_irq_vector(pdev, 0);
64 	res[1].name = PCI_DRIVER_NAME;
65 	res[1].flags = IORESOURCE_IRQ;
66 
67 	dev_info(&pdev->dev, "EMAC physical base addr: %pa\n",
68 		 &res[0].start);
69 
70 	/* set up macb platform data */
71 	memset(&plat_data, 0, sizeof(plat_data));
72 
73 	/* initialize clocks */
74 	plat_data.pclk = clk_register_fixed_rate(&pdev->dev, "pclk", NULL, 0,
75 						 GEM_PCLK_RATE);
76 	if (IS_ERR(plat_data.pclk)) {
77 		err = PTR_ERR(plat_data.pclk);
78 		goto err_pclk_register;
79 	}
80 
81 	plat_data.hclk = clk_register_fixed_rate(&pdev->dev, "hclk", NULL, 0,
82 						 GEM_HCLK_RATE);
83 	if (IS_ERR(plat_data.hclk)) {
84 		err = PTR_ERR(plat_data.hclk);
85 		goto err_hclk_register;
86 	}
87 
88 	/* set up platform device info */
89 	memset(&plat_info, 0, sizeof(plat_info));
90 	plat_info.parent = &pdev->dev;
91 	plat_info.fwnode = pdev->dev.fwnode;
92 	plat_info.name = PLAT_DRIVER_NAME;
93 	plat_info.id = pdev->devfn;
94 	plat_info.res = res;
95 	plat_info.num_res = ARRAY_SIZE(res);
96 	plat_info.data = &plat_data;
97 	plat_info.size_data = sizeof(plat_data);
98 	plat_info.dma_mask = pdev->dma_mask;
99 
100 	/* register platform device */
101 	plat_dev = platform_device_register_full(&plat_info);
102 	if (IS_ERR(plat_dev)) {
103 		err = PTR_ERR(plat_dev);
104 		goto err_plat_dev_register;
105 	}
106 
107 	pci_set_drvdata(pdev, plat_dev);
108 
109 	return 0;
110 
111 err_plat_dev_register:
112 	clk_unregister(plat_data.hclk);
113 
114 err_hclk_register:
115 	clk_unregister(plat_data.pclk);
116 
117 err_pclk_register:
118 	return err;
119 }
120 
121 static void macb_remove(struct pci_dev *pdev)
122 {
123 	struct platform_device *plat_dev = pci_get_drvdata(pdev);
124 	struct macb_platform_data *plat_data = dev_get_platdata(&plat_dev->dev);
125 
126 	platform_device_unregister(plat_dev);
127 	clk_unregister(plat_data->pclk);
128 	clk_unregister(plat_data->hclk);
129 }
130 
131 static struct pci_device_id dev_id_table[] = {
132 	{ PCI_DEVICE(CDNS_VENDOR_ID, CDNS_DEVICE_ID), },
133 	{ 0, }
134 };
135 
136 static struct pci_driver macb_pci_driver = {
137 	.name     = PCI_DRIVER_NAME,
138 	.id_table = dev_id_table,
139 	.probe    = macb_probe,
140 	.remove	  = macb_remove,
141 };
142 
143 module_pci_driver(macb_pci_driver);
144 MODULE_DEVICE_TABLE(pci, dev_id_table);
145 MODULE_LICENSE("GPL");
146 MODULE_DESCRIPTION("Cadence NIC PCI wrapper");
147