1 /******************************************************************************
4 * Xen platform PCI device driver
5 * Copyright (c) 2005, Intel Corporation.
6 * Copyright (c) 2007, XenSource Inc.
7 * Copyright (c) 2010, Citrix
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.
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
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.
25 #include <linux/interrupt.h>
27 #include <linux/module.h>
28 #include <linux/pci.h>
30 #include <xen/platform_pci.h>
31 #include <xen/grant_table.h>
32 #include <xen/xenbus.h>
33 #include <xen/events.h>
35 #include <xen/xen-ops.h>
37 #define DRV_NAME "xen-platform-pci"
39 MODULE_AUTHOR("ssmith@xensource.com and stefano.stabellini@eu.citrix.com");
40 MODULE_DESCRIPTION("Xen platform PCI device");
41 MODULE_LICENSE("GPL");
43 static unsigned long platform_mmio
;
44 static unsigned long platform_mmio_alloc
;
45 static unsigned long platform_mmiolen
;
46 static uint64_t callback_via
;
48 unsigned long alloc_xen_mmio(unsigned long len
)
52 addr
= platform_mmio
+ platform_mmio_alloc
;
53 platform_mmio_alloc
+= len
;
54 BUG_ON(platform_mmio_alloc
> platform_mmiolen
);
59 static uint64_t get_callback_via(struct pci_dev
*pdev
)
66 return irq
; /* ISA IRQ */
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);
78 static irqreturn_t
do_hvm_evtchn_intr(int irq
, void *dev_id
)
80 xen_hvm_evtchn_do_upcall();
84 static int xen_allocate_irq(struct pci_dev
*pdev
)
86 return request_irq(pdev
->irq
, do_hvm_evtchn_intr
,
87 IRQF_DISABLED
| IRQF_NOBALANCING
| IRQF_TRIGGER_RISING
,
88 "xen-platform-pci", pdev
);
91 static int platform_pci_resume(struct pci_dev
*pdev
)
94 if (xen_have_vector_callback
)
96 err
= xen_set_callback_via(callback_via
);
98 dev_err(&pdev
->dev
, "platform_pci_resume failure!\n");
104 static void __devinit
prepare_shared_info(void)
108 struct shared_info
*hvm_shared_info
;
110 addr
= alloc_xen_mmio(PAGE_SIZE
);
111 hvm_shared_info
= ioremap(addr
, PAGE_SIZE
);
112 memset(hvm_shared_info
, 0, PAGE_SIZE
);
113 xen_hvm_prepare_kexec(hvm_shared_info
, addr
>> PAGE_SHIFT
);
117 static int __devinit
platform_pci_init(struct pci_dev
*pdev
,
118 const struct pci_device_id
*ent
)
122 long mmio_addr
, mmio_len
;
123 unsigned int max_nr_gframes
;
128 i
= pci_enable_device(pdev
);
132 ioaddr
= pci_resource_start(pdev
, 0);
134 mmio_addr
= pci_resource_start(pdev
, 1);
135 mmio_len
= pci_resource_len(pdev
, 1);
137 if (mmio_addr
== 0 || ioaddr
== 0) {
138 dev_err(&pdev
->dev
, "no resources found\n");
143 ret
= pci_request_region(pdev
, 1, DRV_NAME
);
147 ret
= pci_request_region(pdev
, 0, DRV_NAME
);
151 platform_mmio
= mmio_addr
;
152 platform_mmiolen
= mmio_len
;
154 prepare_shared_info();
156 if (!xen_have_vector_callback
) {
157 ret
= xen_allocate_irq(pdev
);
159 dev_warn(&pdev
->dev
, "request_irq failed err=%d\n", ret
);
162 callback_via
= get_callback_via(pdev
);
163 ret
= xen_set_callback_via(callback_via
);
165 dev_warn(&pdev
->dev
, "Unable to set the evtchn callback "
171 max_nr_gframes
= gnttab_max_grant_frames();
172 xen_hvm_resume_frames
= alloc_xen_mmio(PAGE_SIZE
* max_nr_gframes
);
180 pci_release_region(pdev
, 0);
182 pci_release_region(pdev
, 1);
184 pci_disable_device(pdev
);
188 static struct pci_device_id platform_pci_tbl
[] __devinitdata
= {
189 {PCI_VENDOR_ID_XEN
, PCI_DEVICE_ID_XEN_PLATFORM
,
190 PCI_ANY_ID
, PCI_ANY_ID
, 0, 0, 0},
194 MODULE_DEVICE_TABLE(pci
, platform_pci_tbl
);
196 static struct pci_driver platform_driver
= {
198 .probe
= platform_pci_init
,
199 .id_table
= platform_pci_tbl
,
201 .resume_early
= platform_pci_resume
,
205 static int __init
platform_pci_module_init(void)
207 return pci_register_driver(&platform_driver
);
210 module_init(platform_pci_module_init
);