1/******************************************************************************
2 * platform-pci.c
3 *
4 * Xen platform PCI device driver
5 *
6 * Authors: ssmith@xensource.com and stefano.stabellini@eu.citrix.com
7 *
8 * Copyright (c) 2005, Intel Corporation.
9 * Copyright (c) 2007, XenSource Inc.
10 * Copyright (c) 2010, Citrix
11 *
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms and conditions of the GNU General Public License,
14 * version 2, as published by the Free Software Foundation.
15 *
16 * This program is distributed in the hope it will be useful, but WITHOUT
17 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
18 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
19 * more details.
20 *
21 * You should have received a copy of the GNU General Public License along with
22 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
23 * Place - Suite 330, Boston, MA 02111-1307 USA.
24 *
25 */
26
27
28#include <linux/interrupt.h>
29#include <linux/io.h>
30#include <linux/init.h>
31#include <linux/pci.h>
32
33#include <xen/platform_pci.h>
34#include <xen/grant_table.h>
35#include <xen/xenbus.h>
36#include <xen/events.h>
37#include <xen/hvm.h>
38#include <xen/xen-ops.h>
39
40#define DRV_NAME "xen-platform-pci"
41
42static unsigned long platform_mmio;
43static unsigned long platform_mmio_alloc;
44static unsigned long platform_mmiolen;
45static uint64_t callback_via;
46
47static unsigned long alloc_xen_mmio(unsigned long len)
48{
49 unsigned long addr;
50
51 addr = platform_mmio + platform_mmio_alloc;
52 platform_mmio_alloc += len;
53 BUG_ON(platform_mmio_alloc > platform_mmiolen);
54
55 return addr;
56}
57
58static uint64_t get_callback_via(struct pci_dev *pdev)
59{
60 u8 pin;
61 int irq;
62
63 irq = pdev->irq;
64 if (irq < 16)
65 return irq; /* ISA IRQ */
66
67 pin = pdev->pin;
68
69 /* We don't know the GSI. Specify the PCI INTx line instead. */
70 return ((uint64_t)0x01 << HVM_CALLBACK_VIA_TYPE_SHIFT) | /* PCI INTx identifier */
71 ((uint64_t)pci_domain_nr(pdev->bus) << 32) |
72 ((uint64_t)pdev->bus->number << 16) |
73 ((uint64_t)(pdev->devfn & 0xff) << 8) |
74 ((uint64_t)(pin - 1) & 3);
75}
76
77static irqreturn_t do_hvm_evtchn_intr(int irq, void *dev_id)
78{
79 xen_hvm_evtchn_do_upcall();
80 return IRQ_HANDLED;
81}
82
83static int xen_allocate_irq(struct pci_dev *pdev)
84{
85 return request_irq(pdev->irq, do_hvm_evtchn_intr,
86 IRQF_NOBALANCING | IRQF_TRIGGER_RISING,
87 "xen-platform-pci", pdev);
88}
89
90static int platform_pci_resume(struct pci_dev *pdev)
91{
92 int err;
93
94 if (xen_have_vector_callback)
95 return 0;
96
97 err = xen_set_callback_via(callback_via);
98 if (err) {
99 dev_err(&pdev->dev, "platform_pci_resume failure!\n");
100 return err;
101 }
102 return 0;
103}
104
105static int platform_pci_probe(struct pci_dev *pdev,
106 const struct pci_device_id *ent)
107{
108 int i, ret;
109 long ioaddr;
110 long mmio_addr, mmio_len;
111 unsigned int max_nr_gframes;
112 unsigned long grant_frames;
113
114 if (!xen_domain())
115 return -ENODEV;
116
117 i = pci_enable_device(pdev);
118 if (i)
119 return i;
120
121 ioaddr = pci_resource_start(pdev, 0);
122
123 mmio_addr = pci_resource_start(pdev, 1);
124 mmio_len = pci_resource_len(pdev, 1);
125
126 if (mmio_addr == 0 || ioaddr == 0) {
127 dev_err(&pdev->dev, "no resources found\n");
128 ret = -ENOENT;
129 goto pci_out;
130 }
131
132 ret = pci_request_region(pdev, 1, DRV_NAME);
133 if (ret < 0)
134 goto pci_out;
135
136 ret = pci_request_region(pdev, 0, DRV_NAME);
137 if (ret < 0)
138 goto mem_out;
139
140 platform_mmio = mmio_addr;
141 platform_mmiolen = mmio_len;
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();
158 grant_frames = alloc_xen_mmio(PAGE_SIZE * max_nr_gframes);
159 ret = gnttab_setup_auto_xlat_frames(grant_frames);
160 if (ret)
161 goto out;
162 ret = gnttab_init();
163 if (ret)
164 goto grant_out;
165 xenbus_probe(NULL);
166 return 0;
167grant_out:
168 gnttab_free_auto_xlat_frames();
169out:
170 pci_release_region(pdev, 0);
171mem_out:
172 pci_release_region(pdev, 1);
173pci_out:
174 pci_disable_device(pdev);
175 return ret;
176}
177
178static const struct pci_device_id platform_pci_tbl[] = {
179 {PCI_VENDOR_ID_XEN, PCI_DEVICE_ID_XEN_PLATFORM,
180 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
181 {0,}
182};
183
184static struct pci_driver platform_driver = {
185 .name = DRV_NAME,
186 .probe = platform_pci_probe,
187 .id_table = platform_pci_tbl,
188#ifdef CONFIG_PM
189 .resume_early = platform_pci_resume,
190#endif
191};
192
193builtin_pci_driver(platform_driver);
194