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Stefano Stabellini183d03c2010-05-17 17:08:21 +01001/******************************************************************************
2 * platform-pci.c
3 *
4 * Xen platform PCI device driver
5 * Copyright (c) 2005, Intel Corporation.
6 * Copyright (c) 2007, XenSource Inc.
7 * Copyright (c) 2010, Citrix
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms and conditions of the GNU General Public License,
11 * version 2, as published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope it will be useful, but WITHOUT
14 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 * more details.
17 *
18 * You should have received a copy of the GNU General Public License along with
19 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
20 * Place - Suite 330, Boston, MA 02111-1307 USA.
21 *
22 */
23
24
25#include <linux/interrupt.h>
26#include <linux/io.h>
27#include <linux/module.h>
28#include <linux/pci.h>
29
Stefano Stabellinic1c54132010-05-14 12:44:30 +010030#include <xen/platform_pci.h>
Stefano Stabellini183d03c2010-05-17 17:08:21 +010031#include <xen/grant_table.h>
32#include <xen/xenbus.h>
33#include <xen/events.h>
34#include <xen/hvm.h>
Stefano Stabellini016b6f52010-05-14 12:45:07 +010035#include <xen/xen-ops.h>
Stefano Stabellini183d03c2010-05-17 17:08:21 +010036
37#define DRV_NAME "xen-platform-pci"
38
39MODULE_AUTHOR("ssmith@xensource.com and stefano.stabellini@eu.citrix.com");
40MODULE_DESCRIPTION("Xen platform PCI device");
41MODULE_LICENSE("GPL");
42
43static unsigned long platform_mmio;
44static unsigned long platform_mmio_alloc;
45static unsigned long platform_mmiolen;
Stefano Stabellini016b6f52010-05-14 12:45:07 +010046static uint64_t callback_via;
Stefano Stabellini183d03c2010-05-17 17:08:21 +010047
48unsigned long alloc_xen_mmio(unsigned long len)
49{
50 unsigned long addr;
51
52 addr = platform_mmio + platform_mmio_alloc;
53 platform_mmio_alloc += len;
54 BUG_ON(platform_mmio_alloc > platform_mmiolen);
55
56 return addr;
57}
58
59static uint64_t get_callback_via(struct pci_dev *pdev)
60{
61 u8 pin;
62 int irq;
63
64 irq = pdev->irq;
65 if (irq < 16)
66 return irq; /* ISA IRQ */
67
68 pin = pdev->pin;
69
70 /* We don't know the GSI. Specify the PCI INTx line instead. */
71 return ((uint64_t)0x01 << 56) | /* PCI INTx identifier */
72 ((uint64_t)pci_domain_nr(pdev->bus) << 32) |
73 ((uint64_t)pdev->bus->number << 16) |
74 ((uint64_t)(pdev->devfn & 0xff) << 8) |
75 ((uint64_t)(pin - 1) & 3);
76}
77
78static irqreturn_t do_hvm_evtchn_intr(int irq, void *dev_id)
79{
80 xen_hvm_evtchn_do_upcall();
81 return IRQ_HANDLED;
82}
83
84static int xen_allocate_irq(struct pci_dev *pdev)
85{
86 return request_irq(pdev->irq, do_hvm_evtchn_intr,
Michael Opdenackeraf09d1a2013-09-09 05:09:47 +020087 IRQF_NOBALANCING | IRQF_TRIGGER_RISING,
Stefano Stabellini183d03c2010-05-17 17:08:21 +010088 "xen-platform-pci", pdev);
89}
90
Stefano Stabellini016b6f52010-05-14 12:45:07 +010091static int platform_pci_resume(struct pci_dev *pdev)
92{
93 int err;
94 if (xen_have_vector_callback)
95 return 0;
96 err = xen_set_callback_via(callback_via);
97 if (err) {
98 dev_err(&pdev->dev, "platform_pci_resume failure!\n");
99 return err;
100 }
101 return 0;
102}
103
Greg Kroah-Hartman345a5252012-12-21 13:00:00 -0800104static int platform_pci_init(struct pci_dev *pdev,
105 const struct pci_device_id *ent)
Stefano Stabellini183d03c2010-05-17 17:08:21 +0100106{
107 int i, ret;
Ian Campbell00f28e42011-01-11 11:50:28 +0000108 long ioaddr;
Stefano Stabellini183d03c2010-05-17 17:08:21 +0100109 long mmio_addr, mmio_len;
Stefano Stabellini183d03c2010-05-17 17:08:21 +0100110 unsigned int max_nr_gframes;
Konrad Rzeszutek Wilkefaf30a2014-01-06 10:40:36 -0500111 unsigned long grant_frames;
Stefano Stabellini183d03c2010-05-17 17:08:21 +0100112
Olaf Hering38ad4f42012-07-10 15:31:39 +0200113 if (!xen_domain())
114 return -ENODEV;
115
Stefano Stabellini183d03c2010-05-17 17:08:21 +0100116 i = pci_enable_device(pdev);
117 if (i)
118 return i;
119
120 ioaddr = pci_resource_start(pdev, 0);
Stefano Stabellini183d03c2010-05-17 17:08:21 +0100121
122 mmio_addr = pci_resource_start(pdev, 1);
123 mmio_len = pci_resource_len(pdev, 1);
124
125 if (mmio_addr == 0 || ioaddr == 0) {
126 dev_err(&pdev->dev, "no resources found\n");
127 ret = -ENOENT;
128 goto pci_out;
129 }
130
Ian Campbell00f28e42011-01-11 11:50:28 +0000131 ret = pci_request_region(pdev, 1, DRV_NAME);
132 if (ret < 0)
Stefano Stabellini183d03c2010-05-17 17:08:21 +0100133 goto pci_out;
Stefano Stabellini183d03c2010-05-17 17:08:21 +0100134
Ian Campbell00f28e42011-01-11 11:50:28 +0000135 ret = pci_request_region(pdev, 0, DRV_NAME);
136 if (ret < 0)
Stefano Stabellini183d03c2010-05-17 17:08:21 +0100137 goto mem_out;
Stefano Stabellini183d03c2010-05-17 17:08:21 +0100138
139 platform_mmio = mmio_addr;
140 platform_mmiolen = mmio_len;
141
142 if (!xen_have_vector_callback) {
143 ret = xen_allocate_irq(pdev);
144 if (ret) {
145 dev_warn(&pdev->dev, "request_irq failed err=%d\n", ret);
146 goto out;
147 }
148 callback_via = get_callback_via(pdev);
149 ret = xen_set_callback_via(callback_via);
150 if (ret) {
151 dev_warn(&pdev->dev, "Unable to set the evtchn callback "
152 "err=%d\n", ret);
153 goto out;
154 }
155 }
156
157 max_nr_gframes = gnttab_max_grant_frames();
Konrad Rzeszutek Wilkefaf30a2014-01-06 10:40:36 -0500158 grant_frames = alloc_xen_mmio(PAGE_SIZE * max_nr_gframes);
Wei Yongjun89b9e082014-01-07 21:11:05 +0800159 ret = gnttab_setup_auto_xlat_frames(grant_frames);
160 if (ret)
Konrad Rzeszutek Wilkefaf30a2014-01-06 10:40:36 -0500161 goto out;
Stefano Stabellini183d03c2010-05-17 17:08:21 +0100162 ret = gnttab_init();
163 if (ret)
Konrad Rzeszutek Wilkefaf30a2014-01-06 10:40:36 -0500164 goto grant_out;
Stefano Stabellini183d03c2010-05-17 17:08:21 +0100165 xenbus_probe(NULL);
166 return 0;
Konrad Rzeszutek Wilkefaf30a2014-01-06 10:40:36 -0500167grant_out:
168 gnttab_free_auto_xlat_frames();
Stefano Stabellini183d03c2010-05-17 17:08:21 +0100169out:
Ian Campbell00f28e42011-01-11 11:50:28 +0000170 pci_release_region(pdev, 0);
Stefano Stabellini183d03c2010-05-17 17:08:21 +0100171mem_out:
Ian Campbell00f28e42011-01-11 11:50:28 +0000172 pci_release_region(pdev, 1);
Stefano Stabellini183d03c2010-05-17 17:08:21 +0100173pci_out:
174 pci_disable_device(pdev);
175 return ret;
176}
177
Greg Kroah-Hartman345a5252012-12-21 13:00:00 -0800178static struct pci_device_id platform_pci_tbl[] = {
Stefano Stabellini183d03c2010-05-17 17:08:21 +0100179 {PCI_VENDOR_ID_XEN, PCI_DEVICE_ID_XEN_PLATFORM,
180 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
181 {0,}
182};
183
184MODULE_DEVICE_TABLE(pci, platform_pci_tbl);
185
186static struct pci_driver platform_driver = {
187 .name = DRV_NAME,
188 .probe = platform_pci_init,
189 .id_table = platform_pci_tbl,
Stefano Stabellini016b6f52010-05-14 12:45:07 +0100190#ifdef CONFIG_PM
191 .resume_early = platform_pci_resume,
192#endif
Stefano Stabellini183d03c2010-05-17 17:08:21 +0100193};
194
195static int __init platform_pci_module_init(void)
196{
Stefano Stabellini183d03c2010-05-17 17:08:21 +0100197 return pci_register_driver(&platform_driver);
198}
199
200module_init(platform_pci_module_init);