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Johannes Thumshirnb71bb862014-02-26 17:29:06 +01001/*
2 * MEN Chameleon Bus.
3 *
4 * Copyright (C) 2014 MEN Mikroelektronik GmbH (www.men.de)
5 * Author: Johannes Thumshirn <johannes.thumshirn@men.de>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the Free
9 * Software Foundation; version 2 of the License.
10 */
11
12#include <linux/module.h>
13#include <linux/pci.h>
14#include <linux/mcb.h>
15
16#include "mcb-internal.h"
17
18struct priv {
19 struct mcb_bus *bus;
Johannes Thumshirn7b7c5492014-12-16 10:09:20 +010020 phys_addr_t mapbase;
Johannes Thumshirnb71bb862014-02-26 17:29:06 +010021 void __iomem *base;
22};
23
Johannes Thumshirn4ec65b72014-04-24 14:35:25 +020024static int mcb_pci_get_irq(struct mcb_device *mdev)
25{
26 struct mcb_bus *mbus = mdev->bus;
27 struct device *dev = mbus->carrier;
28 struct pci_dev *pdev = to_pci_dev(dev);
29
30 return pdev->irq;
31}
32
Johannes Thumshirnb71bb862014-02-26 17:29:06 +010033static int mcb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
34{
Johannes Thumshirn7b7c5492014-12-16 10:09:20 +010035 struct resource *res;
Johannes Thumshirnb71bb862014-02-26 17:29:06 +010036 struct priv *priv;
Johannes Thumshirnb71bb862014-02-26 17:29:06 +010037 int ret;
Johannes Thumshirnb71bb862014-02-26 17:29:06 +010038 unsigned long flags;
39
40 priv = devm_kzalloc(&pdev->dev, sizeof(struct priv), GFP_KERNEL);
41 if (!priv)
42 return -ENOMEM;
43
44 ret = pci_enable_device(pdev);
45 if (ret) {
46 dev_err(&pdev->dev, "Failed to enable PCI device\n");
47 return -ENODEV;
48 }
49
Johannes Thumshirn7b7c5492014-12-16 10:09:20 +010050 priv->mapbase = pci_resource_start(pdev, 0);
51 if (!priv->mapbase) {
Johannes Thumshirnb71bb862014-02-26 17:29:06 +010052 dev_err(&pdev->dev, "No PCI resource\n");
Alexey Khoroshilovbf25c192015-10-28 08:22:15 +010053 ret = -ENODEV;
Johannes Thumshirna48742b2015-01-12 16:26:32 +010054 goto out_disable;
Johannes Thumshirnb71bb862014-02-26 17:29:06 +010055 }
56
Andreas Wernerd19366f2016-05-03 12:42:01 +020057 res = devm_request_mem_region(&pdev->dev, priv->mapbase,
58 CHAM_HEADER_SIZE,
59 KBUILD_MODNAME);
Dan Carpenterd86fb452015-03-26 22:12:49 +030060 if (!res) {
Johannes Thumshirn7b7c5492014-12-16 10:09:20 +010061 dev_err(&pdev->dev, "Failed to request PCI memory\n");
Dan Carpenterd86fb452015-03-26 22:12:49 +030062 ret = -EBUSY;
Johannes Thumshirna48742b2015-01-12 16:26:32 +010063 goto out_disable;
Johannes Thumshirnb71bb862014-02-26 17:29:06 +010064 }
65
Andreas Wernerd19366f2016-05-03 12:42:01 +020066 priv->base = devm_ioremap(&pdev->dev, priv->mapbase, CHAM_HEADER_SIZE);
Johannes Thumshirnb71bb862014-02-26 17:29:06 +010067 if (!priv->base) {
68 dev_err(&pdev->dev, "Cannot ioremap\n");
69 ret = -ENOMEM;
Andreas Wernerd19366f2016-05-03 12:42:01 +020070 goto out_disable;
Johannes Thumshirnb71bb862014-02-26 17:29:06 +010071 }
72
73 flags = pci_resource_flags(pdev, 0);
74 if (flags & IORESOURCE_IO) {
75 ret = -ENOTSUPP;
76 dev_err(&pdev->dev,
77 "IO mapped PCI devices are not supported\n");
Andreas Wernerd19366f2016-05-03 12:42:01 +020078 goto out_disable;
Johannes Thumshirnb71bb862014-02-26 17:29:06 +010079 }
80
81 pci_set_drvdata(pdev, priv);
82
Johannes Thumshirn4ec65b72014-04-24 14:35:25 +020083 priv->bus = mcb_alloc_bus(&pdev->dev);
84 if (IS_ERR(priv->bus)) {
85 ret = PTR_ERR(priv->bus);
Andreas Wernerd19366f2016-05-03 12:42:01 +020086 goto out_disable;
Johannes Thumshirn4ec65b72014-04-24 14:35:25 +020087 }
88
89 priv->bus->get_irq = mcb_pci_get_irq;
Johannes Thumshirnb71bb862014-02-26 17:29:06 +010090
Johannes Thumshirn7b7c5492014-12-16 10:09:20 +010091 ret = chameleon_parse_cells(priv->bus, priv->mapbase, priv->base);
Johannes Thumshirnb71bb862014-02-26 17:29:06 +010092 if (ret < 0)
Alexey Khoroshilov41ada9d2015-08-24 10:18:38 +020093 goto out_mcb_bus;
Johannes Thumshirnb71bb862014-02-26 17:29:06 +010094
Andreas Werner8cd1f9d2016-05-03 12:42:02 +020095 dev_dbg(&pdev->dev, "Found %d cells\n", ret);
Johannes Thumshirnb71bb862014-02-26 17:29:06 +010096
97 mcb_bus_add_devices(priv->bus);
98
Johannes Thumshirn7b7c5492014-12-16 10:09:20 +010099 return 0;
100
Alexey Khoroshilov41ada9d2015-08-24 10:18:38 +0200101out_mcb_bus:
102 mcb_release_bus(priv->bus);
Johannes Thumshirna48742b2015-01-12 16:26:32 +0100103out_disable:
Johannes Thumshirnb71bb862014-02-26 17:29:06 +0100104 pci_disable_device(pdev);
105 return ret;
106}
107
108static void mcb_pci_remove(struct pci_dev *pdev)
109{
110 struct priv *priv = pci_get_drvdata(pdev);
111
112 mcb_release_bus(priv->bus);
Johannes Thumshirn7b7c5492014-12-16 10:09:20 +0100113
Johannes Thumshirn7b7c5492014-12-16 10:09:20 +0100114 pci_disable_device(pdev);
Johannes Thumshirnb71bb862014-02-26 17:29:06 +0100115}
116
117static const struct pci_device_id mcb_pci_tbl[] = {
118 { PCI_DEVICE(PCI_VENDOR_ID_MEN, PCI_DEVICE_ID_MEN_CHAMELEON) },
119 { 0 },
120};
121MODULE_DEVICE_TABLE(pci, mcb_pci_tbl);
122
123static struct pci_driver mcb_pci_driver = {
124 .name = "mcb-pci",
125 .id_table = mcb_pci_tbl,
126 .probe = mcb_pci_probe,
127 .remove = mcb_pci_remove,
128};
129
130module_pci_driver(mcb_pci_driver);
131
132MODULE_AUTHOR("Johannes Thumshirn <johannes.thumshirn@men.de>");
133MODULE_LICENSE("GPL");
134MODULE_DESCRIPTION("MCB over PCI support");