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/platform_pci.h> 31 #include <xen/grant_table.h> 32 #include <xen/xenbus.h> 33 #include <xen/events.h> 34 #include <xen/hvm.h> 35 #include <xen/xen-ops.h> 36 37 #define DRV_NAME "xen-platform-pci" 38 39 MODULE_AUTHOR("ssmith@xensource.com and stefano.stabellini@eu.citrix.com"); 40 MODULE_DESCRIPTION("Xen platform PCI device"); 41 MODULE_LICENSE("GPL"); 42 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; 47 48 static unsigned long alloc_xen_mmio(unsigned long len) 49 { 50 unsigned long addr; 51 52 addr = platform_mmio + platform_mmio_alloc; 53 platform_mmio_alloc += len; 54 BUG_ON(platform_mmio_alloc > platform_mmiolen); 55 56 return addr; 57 } 58 59 static uint64_t get_callback_via(struct pci_dev *pdev) 60 { 61 u8 pin; 62 int irq; 63 64 irq = pdev->irq; 65 if (irq < 16) 66 return irq; /* ISA IRQ */ 67 68 pin = pdev->pin; 69 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); 76 } 77 78 static irqreturn_t do_hvm_evtchn_intr(int irq, void *dev_id) 79 { 80 xen_hvm_evtchn_do_upcall(); 81 return IRQ_HANDLED; 82 } 83 84 static int xen_allocate_irq(struct pci_dev *pdev) 85 { 86 return request_irq(pdev->irq, do_hvm_evtchn_intr, 87 IRQF_NOBALANCING | IRQF_TRIGGER_RISING, 88 "xen-platform-pci", pdev); 89 } 90 91 static int platform_pci_resume(struct pci_dev *pdev) 92 { 93 int err; 94 if (xen_have_vector_callback) 95 return 0; 96 err = xen_set_callback_via(callback_via); 97 if (err) { 98 dev_err(&pdev->dev, "platform_pci_resume failure!\n"); 99 return err; 100 } 101 return 0; 102 } 103 104 static int platform_pci_init(struct pci_dev *pdev, 105 const struct pci_device_id *ent) 106 { 107 int i, ret; 108 long ioaddr; 109 long mmio_addr, mmio_len; 110 unsigned int max_nr_gframes; 111 unsigned long grant_frames; 112 113 if (!xen_domain()) 114 return -ENODEV; 115 116 i = pci_enable_device(pdev); 117 if (i) 118 return i; 119 120 ioaddr = pci_resource_start(pdev, 0); 121 122 mmio_addr = pci_resource_start(pdev, 1); 123 mmio_len = pci_resource_len(pdev, 1); 124 125 if (mmio_addr == 0 || ioaddr == 0) { 126 dev_err(&pdev->dev, "no resources found\n"); 127 ret = -ENOENT; 128 goto pci_out; 129 } 130 131 ret = pci_request_region(pdev, 1, DRV_NAME); 132 if (ret < 0) 133 goto pci_out; 134 135 ret = pci_request_region(pdev, 0, DRV_NAME); 136 if (ret < 0) 137 goto mem_out; 138 139 platform_mmio = mmio_addr; 140 platform_mmiolen = mmio_len; 141 142 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; 167 grant_out: 168 gnttab_free_auto_xlat_frames(); 169 out: 170 pci_release_region(pdev, 0); 171 mem_out: 172 pci_release_region(pdev, 1); 173 pci_out: 174 pci_disable_device(pdev); 175 return ret; 176 } 177 178 static 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 }; 183 184 MODULE_DEVICE_TABLE(pci, platform_pci_tbl); 185 186 static struct pci_driver platform_driver = { 187 .name = DRV_NAME, 188 .probe = platform_pci_init, 189 .id_table = platform_pci_tbl, 190 #ifdef CONFIG_PM 191 .resume_early = platform_pci_resume, 192 #endif 193 }; 194 195 static int __init platform_pci_module_init(void) 196 { 197 return pci_register_driver(&platform_driver); 198 } 199 200 module_init(platform_pci_module_init); 201