1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * MEN Chameleon Bus.
4 *
5 * Copyright (C) 2014 MEN Mikroelektronik GmbH (www.men.de)
6 * Author: Johannes Thumshirn <johannes.thumshirn@men.de>
7 */
8
9 #include <linux/module.h>
10 #include <linux/pci.h>
11 #include <linux/mcb.h>
12
13 #include "mcb-internal.h"
14
15 struct priv {
16 struct mcb_bus *bus;
17 phys_addr_t mapbase;
18 void __iomem *base;
19 };
20
mcb_pci_get_irq(struct mcb_device * mdev)21 static int mcb_pci_get_irq(struct mcb_device *mdev)
22 {
23 struct mcb_bus *mbus = mdev->bus;
24 struct device *dev = mbus->carrier;
25 struct pci_dev *pdev = to_pci_dev(dev);
26
27 return pdev->irq;
28 }
29
mcb_pci_probe(struct pci_dev * pdev,const struct pci_device_id * id)30 static int mcb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
31 {
32 struct resource *res;
33 struct priv *priv;
34 int ret, table_size;
35 unsigned long flags;
36
37 priv = devm_kzalloc(&pdev->dev, sizeof(struct priv), GFP_KERNEL);
38 if (!priv)
39 return -ENOMEM;
40
41 ret = pci_enable_device(pdev);
42 if (ret) {
43 dev_err(&pdev->dev, "Failed to enable PCI device\n");
44 return -ENODEV;
45 }
46 pci_set_master(pdev);
47
48 priv->mapbase = pci_resource_start(pdev, 0);
49 if (!priv->mapbase) {
50 dev_err(&pdev->dev, "No PCI resource\n");
51 ret = -ENODEV;
52 goto out_disable;
53 }
54
55 res = devm_request_mem_region(&pdev->dev, priv->mapbase,
56 CHAM_HEADER_SIZE,
57 KBUILD_MODNAME);
58 if (!res) {
59 dev_err(&pdev->dev, "Failed to request PCI memory\n");
60 ret = -EBUSY;
61 goto out_disable;
62 }
63
64 priv->base = devm_ioremap(&pdev->dev, priv->mapbase, CHAM_HEADER_SIZE);
65 if (!priv->base) {
66 dev_err(&pdev->dev, "Cannot ioremap\n");
67 ret = -ENOMEM;
68 goto out_disable;
69 }
70
71 flags = pci_resource_flags(pdev, 0);
72 if (flags & IORESOURCE_IO) {
73 ret = -ENOTSUPP;
74 dev_err(&pdev->dev,
75 "IO mapped PCI devices are not supported\n");
76 goto out_disable;
77 }
78
79 pci_set_drvdata(pdev, priv);
80
81 priv->bus = mcb_alloc_bus(&pdev->dev);
82 if (IS_ERR(priv->bus)) {
83 ret = PTR_ERR(priv->bus);
84 goto out_disable;
85 }
86
87 priv->bus->get_irq = mcb_pci_get_irq;
88
89 ret = chameleon_parse_cells(priv->bus, priv->mapbase, priv->base);
90 if (ret < 0)
91 goto out_mcb_bus;
92
93 table_size = ret;
94
95 if (table_size < CHAM_HEADER_SIZE) {
96 /* Release the previous resources */
97 devm_iounmap(&pdev->dev, priv->base);
98 devm_release_mem_region(&pdev->dev, priv->mapbase, CHAM_HEADER_SIZE);
99
100 /* Then, allocate it again with the actual chameleon table size */
101 res = devm_request_mem_region(&pdev->dev, priv->mapbase,
102 table_size,
103 KBUILD_MODNAME);
104 if (!res) {
105 dev_err(&pdev->dev, "Failed to request PCI memory\n");
106 ret = -EBUSY;
107 goto out_mcb_bus;
108 }
109
110 priv->base = devm_ioremap(&pdev->dev, priv->mapbase, table_size);
111 if (!priv->base) {
112 dev_err(&pdev->dev, "Cannot ioremap\n");
113 ret = -ENOMEM;
114 goto out_mcb_bus;
115 }
116 }
117
118 mcb_bus_add_devices(priv->bus);
119
120 return 0;
121
122 out_mcb_bus:
123 mcb_release_bus(priv->bus);
124 out_disable:
125 pci_disable_device(pdev);
126 return ret;
127 }
128
mcb_pci_remove(struct pci_dev * pdev)129 static void mcb_pci_remove(struct pci_dev *pdev)
130 {
131 struct priv *priv = pci_get_drvdata(pdev);
132
133 mcb_release_bus(priv->bus);
134
135 pci_disable_device(pdev);
136 }
137
138 static const struct pci_device_id mcb_pci_tbl[] = {
139 { PCI_DEVICE(PCI_VENDOR_ID_MEN, PCI_DEVICE_ID_MEN_CHAMELEON) },
140 { PCI_DEVICE(PCI_VENDOR_ID_ALTERA, PCI_DEVICE_ID_MEN_CHAMELEON) },
141 { 0 },
142 };
143 MODULE_DEVICE_TABLE(pci, mcb_pci_tbl);
144
145 static struct pci_driver mcb_pci_driver = {
146 .name = "mcb-pci",
147 .id_table = mcb_pci_tbl,
148 .probe = mcb_pci_probe,
149 .remove = mcb_pci_remove,
150 };
151
152 module_pci_driver(mcb_pci_driver);
153
154 MODULE_AUTHOR("Johannes Thumshirn <johannes.thumshirn@men.de>");
155 MODULE_LICENSE("GPL");
156 MODULE_DESCRIPTION("MCB over PCI support");
157 MODULE_IMPORT_NS(MCB);
158