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183d03cc SS |
1 | /****************************************************************************** |
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 | ||
30 | #include <xen/grant_table.h> | |
31 | #include <xen/xenbus.h> | |
32 | #include <xen/events.h> | |
33 | #include <xen/hvm.h> | |
016b6f5f | 34 | #include <xen/xen-ops.h> |
183d03cc SS |
35 | |
36 | #define DRV_NAME "xen-platform-pci" | |
37 | ||
38 | MODULE_AUTHOR("ssmith@xensource.com and stefano.stabellini@eu.citrix.com"); | |
39 | MODULE_DESCRIPTION("Xen platform PCI device"); | |
40 | MODULE_LICENSE("GPL"); | |
41 | ||
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 SS |
46 | |
47 | 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 | ||
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, | |
86 | IRQF_DISABLED | IRQF_NOBALANCING | IRQF_TRIGGER_RISING, | |
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 | ||
183d03cc SS |
103 | static int __devinit platform_pci_init(struct pci_dev *pdev, |
104 | const struct pci_device_id *ent) | |
105 | { | |
106 | int i, ret; | |
107 | long ioaddr, iolen; | |
108 | long mmio_addr, mmio_len; | |
183d03cc SS |
109 | unsigned int max_nr_gframes; |
110 | ||
111 | i = pci_enable_device(pdev); | |
112 | if (i) | |
113 | return i; | |
114 | ||
115 | ioaddr = pci_resource_start(pdev, 0); | |
116 | iolen = pci_resource_len(pdev, 0); | |
117 | ||
118 | mmio_addr = pci_resource_start(pdev, 1); | |
119 | mmio_len = pci_resource_len(pdev, 1); | |
120 | ||
121 | if (mmio_addr == 0 || ioaddr == 0) { | |
122 | dev_err(&pdev->dev, "no resources found\n"); | |
123 | ret = -ENOENT; | |
124 | goto pci_out; | |
125 | } | |
126 | ||
127 | if (request_mem_region(mmio_addr, mmio_len, DRV_NAME) == NULL) { | |
128 | dev_err(&pdev->dev, "MEM I/O resource 0x%lx @ 0x%lx busy\n", | |
129 | mmio_addr, mmio_len); | |
130 | ret = -EBUSY; | |
131 | goto pci_out; | |
132 | } | |
133 | ||
134 | if (request_region(ioaddr, iolen, DRV_NAME) == NULL) { | |
135 | dev_err(&pdev->dev, "I/O resource 0x%lx @ 0x%lx busy\n", | |
136 | iolen, ioaddr); | |
137 | ret = -EBUSY; | |
138 | goto mem_out; | |
139 | } | |
140 | ||
141 | platform_mmio = mmio_addr; | |
142 | platform_mmiolen = mmio_len; | |
143 | ||
144 | if (!xen_have_vector_callback) { | |
145 | ret = xen_allocate_irq(pdev); | |
146 | if (ret) { | |
147 | dev_warn(&pdev->dev, "request_irq failed err=%d\n", ret); | |
148 | goto out; | |
149 | } | |
150 | callback_via = get_callback_via(pdev); | |
151 | ret = xen_set_callback_via(callback_via); | |
152 | if (ret) { | |
153 | dev_warn(&pdev->dev, "Unable to set the evtchn callback " | |
154 | "err=%d\n", ret); | |
155 | goto out; | |
156 | } | |
157 | } | |
158 | ||
159 | max_nr_gframes = gnttab_max_grant_frames(); | |
160 | xen_hvm_resume_frames = alloc_xen_mmio(PAGE_SIZE * max_nr_gframes); | |
161 | ret = gnttab_init(); | |
162 | if (ret) | |
163 | goto out; | |
164 | xenbus_probe(NULL); | |
016b6f5f SS |
165 | ret = xen_setup_shutdown_event(); |
166 | if (ret) | |
167 | goto out; | |
183d03cc SS |
168 | return 0; |
169 | ||
170 | out: | |
171 | release_region(ioaddr, iolen); | |
172 | mem_out: | |
173 | release_mem_region(mmio_addr, mmio_len); | |
174 | pci_out: | |
175 | pci_disable_device(pdev); | |
176 | return ret; | |
177 | } | |
178 | ||
179 | static struct pci_device_id platform_pci_tbl[] __devinitdata = { | |
180 | {PCI_VENDOR_ID_XEN, PCI_DEVICE_ID_XEN_PLATFORM, | |
181 | PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, | |
182 | {0,} | |
183 | }; | |
184 | ||
185 | MODULE_DEVICE_TABLE(pci, platform_pci_tbl); | |
186 | ||
187 | static struct pci_driver platform_driver = { | |
188 | .name = DRV_NAME, | |
189 | .probe = platform_pci_init, | |
190 | .id_table = platform_pci_tbl, | |
016b6f5f SS |
191 | #ifdef CONFIG_PM |
192 | .resume_early = platform_pci_resume, | |
193 | #endif | |
183d03cc SS |
194 | }; |
195 | ||
196 | static int __init platform_pci_module_init(void) | |
197 | { | |
198 | return pci_register_driver(&platform_driver); | |
199 | } | |
200 | ||
201 | module_init(platform_pci_module_init); |