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183d03cc SS |
1 | /****************************************************************************** |
2 | * platform-pci.c | |
3 | * | |
4 | * Xen platform PCI device driver | |
e01dc539 PG |
5 | * |
6 | * Authors: ssmith@xensource.com and stefano.stabellini@eu.citrix.com | |
7 | * | |
183d03cc SS |
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> | |
e01dc539 | 30 | #include <linux/init.h> |
183d03cc SS |
31 | #include <linux/pci.h> |
32 | ||
c1c5413a | 33 | #include <xen/platform_pci.h> |
183d03cc SS |
34 | #include <xen/grant_table.h> |
35 | #include <xen/xenbus.h> | |
36 | #include <xen/events.h> | |
37 | #include <xen/hvm.h> | |
016b6f5f | 38 | #include <xen/xen-ops.h> |
183d03cc SS |
39 | |
40 | #define DRV_NAME "xen-platform-pci" | |
41 | ||
183d03cc SS |
42 | static unsigned long platform_mmio; |
43 | static unsigned long platform_mmio_alloc; | |
44 | static unsigned long platform_mmiolen; | |
016b6f5f | 45 | static uint64_t callback_via; |
183d03cc | 46 | |
598ddb8c | 47 | static unsigned long alloc_xen_mmio(unsigned long len) |
183d03cc SS |
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 | ||
58 | static 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 << 56) | /* 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 | ||
77 | static irqreturn_t do_hvm_evtchn_intr(int irq, void *dev_id) | |
78 | { | |
79 | xen_hvm_evtchn_do_upcall(); | |
80 | return IRQ_HANDLED; | |
81 | } | |
82 | ||
83 | static int xen_allocate_irq(struct pci_dev *pdev) | |
84 | { | |
85 | return request_irq(pdev->irq, do_hvm_evtchn_intr, | |
af09d1a7 | 86 | IRQF_NOBALANCING | IRQF_TRIGGER_RISING, |
183d03cc SS |
87 | "xen-platform-pci", pdev); |
88 | } | |
89 | ||
016b6f5f SS |
90 | static int platform_pci_resume(struct pci_dev *pdev) |
91 | { | |
92 | int err; | |
93 | if (xen_have_vector_callback) | |
94 | return 0; | |
95 | err = xen_set_callback_via(callback_via); | |
96 | if (err) { | |
97 | dev_err(&pdev->dev, "platform_pci_resume failure!\n"); | |
98 | return err; | |
99 | } | |
100 | return 0; | |
101 | } | |
102 | ||
e01dc539 PG |
103 | static int platform_pci_probe(struct pci_dev *pdev, |
104 | const struct pci_device_id *ent) | |
183d03cc SS |
105 | { |
106 | int i, ret; | |
00f28e40 | 107 | long ioaddr; |
183d03cc | 108 | long mmio_addr, mmio_len; |
183d03cc | 109 | unsigned int max_nr_gframes; |
efaf30a3 | 110 | unsigned long grant_frames; |
183d03cc | 111 | |
38ad4f4b OH |
112 | if (!xen_domain()) |
113 | return -ENODEV; | |
114 | ||
183d03cc SS |
115 | i = pci_enable_device(pdev); |
116 | if (i) | |
117 | return i; | |
118 | ||
119 | ioaddr = pci_resource_start(pdev, 0); | |
183d03cc SS |
120 | |
121 | mmio_addr = pci_resource_start(pdev, 1); | |
122 | mmio_len = pci_resource_len(pdev, 1); | |
123 | ||
124 | if (mmio_addr == 0 || ioaddr == 0) { | |
125 | dev_err(&pdev->dev, "no resources found\n"); | |
126 | ret = -ENOENT; | |
127 | goto pci_out; | |
128 | } | |
129 | ||
00f28e40 IC |
130 | ret = pci_request_region(pdev, 1, DRV_NAME); |
131 | if (ret < 0) | |
183d03cc | 132 | goto pci_out; |
183d03cc | 133 | |
00f28e40 IC |
134 | ret = pci_request_region(pdev, 0, DRV_NAME); |
135 | if (ret < 0) | |
183d03cc | 136 | goto mem_out; |
183d03cc SS |
137 | |
138 | platform_mmio = mmio_addr; | |
139 | platform_mmiolen = mmio_len; | |
140 | ||
141 | if (!xen_have_vector_callback) { | |
142 | ret = xen_allocate_irq(pdev); | |
143 | if (ret) { | |
144 | dev_warn(&pdev->dev, "request_irq failed err=%d\n", ret); | |
145 | goto out; | |
146 | } | |
147 | callback_via = get_callback_via(pdev); | |
148 | ret = xen_set_callback_via(callback_via); | |
149 | if (ret) { | |
150 | dev_warn(&pdev->dev, "Unable to set the evtchn callback " | |
151 | "err=%d\n", ret); | |
152 | goto out; | |
153 | } | |
154 | } | |
155 | ||
156 | max_nr_gframes = gnttab_max_grant_frames(); | |
efaf30a3 | 157 | grant_frames = alloc_xen_mmio(PAGE_SIZE * max_nr_gframes); |
89b9e08f WY |
158 | ret = gnttab_setup_auto_xlat_frames(grant_frames); |
159 | if (ret) | |
efaf30a3 | 160 | goto out; |
183d03cc SS |
161 | ret = gnttab_init(); |
162 | if (ret) | |
efaf30a3 | 163 | goto grant_out; |
183d03cc SS |
164 | xenbus_probe(NULL); |
165 | return 0; | |
efaf30a3 KRW |
166 | grant_out: |
167 | gnttab_free_auto_xlat_frames(); | |
183d03cc | 168 | out: |
00f28e40 | 169 | pci_release_region(pdev, 0); |
183d03cc | 170 | mem_out: |
00f28e40 | 171 | pci_release_region(pdev, 1); |
183d03cc SS |
172 | pci_out: |
173 | pci_disable_device(pdev); | |
174 | return ret; | |
175 | } | |
176 | ||
345a5255 | 177 | static struct pci_device_id platform_pci_tbl[] = { |
183d03cc SS |
178 | {PCI_VENDOR_ID_XEN, PCI_DEVICE_ID_XEN_PLATFORM, |
179 | PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, | |
180 | {0,} | |
181 | }; | |
182 | ||
183d03cc SS |
183 | static struct pci_driver platform_driver = { |
184 | .name = DRV_NAME, | |
e01dc539 | 185 | .probe = platform_pci_probe, |
183d03cc | 186 | .id_table = platform_pci_tbl, |
016b6f5f SS |
187 | #ifdef CONFIG_PM |
188 | .resume_early = platform_pci_resume, | |
189 | #endif | |
183d03cc SS |
190 | }; |
191 | ||
e01dc539 | 192 | static int __init platform_pci_init(void) |
183d03cc SS |
193 | { |
194 | return pci_register_driver(&platform_driver); | |
195 | } | |
e01dc539 | 196 | device_initcall(platform_pci_init); |