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