1 /* 2 * Sonics Silicon Backplane 3 * PCI Hostdevice wrapper 4 * 5 * Copyright (c) 2005 Martin Langer <martin-langer@gmx.de> 6 * Copyright (c) 2005 Stefano Brivio <st3@riseup.net> 7 * Copyright (c) 2005 Danny van Dyk <kugelfang@gentoo.org> 8 * Copyright (c) 2005 Andreas Jaggi <andreas.jaggi@waterwave.ch> 9 * Copyright (c) 2005-2007 Michael Buesch <m@bues.ch> 10 * 11 * Licensed under the GNU/GPL. See COPYING for details. 12 */ 13 14 #include <linux/pci.h> 15 #include <linux/export.h> 16 #include <linux/slab.h> 17 #include <linux/ssb/ssb.h> 18 19 20 #ifdef CONFIG_PM 21 static int ssb_pcihost_suspend(struct pci_dev *dev, pm_message_t state) 22 { 23 struct ssb_bus *ssb = pci_get_drvdata(dev); 24 int err; 25 26 err = ssb_bus_suspend(ssb); 27 if (err) 28 return err; 29 pci_save_state(dev); 30 pci_disable_device(dev); 31 pci_set_power_state(dev, pci_choose_state(dev, state)); 32 33 return 0; 34 } 35 36 static int ssb_pcihost_resume(struct pci_dev *dev) 37 { 38 struct ssb_bus *ssb = pci_get_drvdata(dev); 39 int err; 40 41 pci_set_power_state(dev, PCI_D0); 42 err = pci_enable_device(dev); 43 if (err) 44 return err; 45 pci_restore_state(dev); 46 err = ssb_bus_resume(ssb); 47 if (err) 48 return err; 49 50 return 0; 51 } 52 #else /* CONFIG_PM */ 53 # define ssb_pcihost_suspend NULL 54 # define ssb_pcihost_resume NULL 55 #endif /* CONFIG_PM */ 56 57 static int ssb_pcihost_probe(struct pci_dev *dev, 58 const struct pci_device_id *id) 59 { 60 struct ssb_bus *ssb; 61 int err = -ENOMEM; 62 const char *name; 63 u32 val; 64 65 ssb = kzalloc(sizeof(*ssb), GFP_KERNEL); 66 if (!ssb) 67 goto out; 68 err = pci_enable_device(dev); 69 if (err) 70 goto err_kfree_ssb; 71 name = dev_name(&dev->dev); 72 if (dev->driver && dev->driver->name) 73 name = dev->driver->name; 74 err = pci_request_regions(dev, name); 75 if (err) 76 goto err_pci_disable; 77 pci_set_master(dev); 78 79 /* Disable the RETRY_TIMEOUT register (0x41) to keep 80 * PCI Tx retries from interfering with C3 CPU state */ 81 pci_read_config_dword(dev, 0x40, &val); 82 if ((val & 0x0000ff00) != 0) 83 pci_write_config_dword(dev, 0x40, val & 0xffff00ff); 84 85 err = ssb_bus_pcibus_register(ssb, dev); 86 if (err) 87 goto err_pci_release_regions; 88 89 pci_set_drvdata(dev, ssb); 90 91 out: 92 return err; 93 94 err_pci_release_regions: 95 pci_release_regions(dev); 96 err_pci_disable: 97 pci_disable_device(dev); 98 err_kfree_ssb: 99 kfree(ssb); 100 return err; 101 } 102 103 static void ssb_pcihost_remove(struct pci_dev *dev) 104 { 105 struct ssb_bus *ssb = pci_get_drvdata(dev); 106 107 ssb_bus_unregister(ssb); 108 pci_release_regions(dev); 109 pci_disable_device(dev); 110 kfree(ssb); 111 pci_set_drvdata(dev, NULL); 112 } 113 114 int ssb_pcihost_register(struct pci_driver *driver) 115 { 116 driver->probe = ssb_pcihost_probe; 117 driver->remove = ssb_pcihost_remove; 118 driver->suspend = ssb_pcihost_suspend; 119 driver->resume = ssb_pcihost_resume; 120 121 return pci_register_driver(driver); 122 } 123 EXPORT_SYMBOL(ssb_pcihost_register); 124