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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;
66
67 pin = pdev->pin;
68
69
70 return ((uint64_t)0x01 << 56) |
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 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
103static int platform_pci_probe(struct pci_dev *pdev,
104 const struct pci_device_id *ent)
105{
106 int i, ret;
107 long ioaddr;
108 long mmio_addr, mmio_len;
109 unsigned int max_nr_gframes;
110 unsigned long grant_frames;
111
112 if (!xen_domain())
113 return -ENODEV;
114
115 i = pci_enable_device(pdev);
116 if (i)
117 return i;
118
119 ioaddr = pci_resource_start(pdev, 0);
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
130 ret = pci_request_region(pdev, 1, DRV_NAME);
131 if (ret < 0)
132 goto pci_out;
133
134 ret = pci_request_region(pdev, 0, DRV_NAME);
135 if (ret < 0)
136 goto mem_out;
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();
157 grant_frames = alloc_xen_mmio(PAGE_SIZE * max_nr_gframes);
158 ret = gnttab_setup_auto_xlat_frames(grant_frames);
159 if (ret)
160 goto out;
161 ret = gnttab_init();
162 if (ret)
163 goto grant_out;
164 xenbus_probe(NULL);
165 return 0;
166grant_out:
167 gnttab_free_auto_xlat_frames();
168out:
169 pci_release_region(pdev, 0);
170mem_out:
171 pci_release_region(pdev, 1);
172pci_out:
173 pci_disable_device(pdev);
174 return ret;
175}
176
177static struct pci_device_id platform_pci_tbl[] = {
178 {PCI_VENDOR_ID_XEN, PCI_DEVICE_ID_XEN_PLATFORM,
179 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
180 {0,}
181};
182
183static struct pci_driver platform_driver = {
184 .name = DRV_NAME,
185 .probe = platform_pci_probe,
186 .id_table = platform_pci_tbl,
187#ifdef CONFIG_PM
188 .resume_early = platform_pci_resume,
189#endif
190};
191
192static int __init platform_pci_init(void)
193{
194 return pci_register_driver(&platform_driver);
195}
196device_initcall(platform_pci_init);
197
