1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Cadence USBHS-DEV controller - PCI Glue driver. 4 * 5 * Copyright (C) 2023 Cadence. 6 * 7 * Author: Pawel Laszczak <pawell@cadence.com> 8 * 9 */ 10 11 #include <linux/pm_runtime.h> 12 #include <linux/slab.h> 13 #include <linux/pci.h> 14 15 #include "cdns2-gadget.h" 16 17 #define PCI_DRIVER_NAME "cdns-pci-usbhs" 18 #define PCI_DEVICE_ID_CDNS_USB2 0x0120 19 #define PCI_BAR_DEV 0 20 #define PCI_DEV_FN_DEVICE 0 21 22 static int cdns2_pci_probe(struct pci_dev *pdev, 23 const struct pci_device_id *id) 24 { 25 resource_size_t rsrc_start, rsrc_len; 26 struct device *dev = &pdev->dev; 27 struct cdns2_device *priv_dev; 28 struct resource *res; 29 int ret; 30 31 /* For GADGET PCI (devfn) function number is 0. */ 32 if (!id || pdev->devfn != PCI_DEV_FN_DEVICE || 33 pdev->class != PCI_CLASS_SERIAL_USB_DEVICE) 34 return -EINVAL; 35 36 ret = pcim_enable_device(pdev); 37 if (ret) { 38 dev_err(&pdev->dev, "Enabling PCI device has failed %d\n", ret); 39 return ret; 40 } 41 42 pci_set_master(pdev); 43 44 priv_dev = devm_kzalloc(&pdev->dev, sizeof(*priv_dev), GFP_KERNEL); 45 if (!priv_dev) 46 return -ENOMEM; 47 48 dev_dbg(dev, "Initialize resources\n"); 49 rsrc_start = pci_resource_start(pdev, PCI_BAR_DEV); 50 rsrc_len = pci_resource_len(pdev, PCI_BAR_DEV); 51 52 res = devm_request_mem_region(dev, rsrc_start, rsrc_len, "dev"); 53 if (!res) { 54 dev_dbg(dev, "controller already in use\n"); 55 return -EBUSY; 56 } 57 58 priv_dev->regs = devm_ioremap(dev, rsrc_start, rsrc_len); 59 if (!priv_dev->regs) { 60 dev_dbg(dev, "error mapping memory\n"); 61 return -EFAULT; 62 } 63 64 priv_dev->irq = pdev->irq; 65 dev_dbg(dev, "USBSS-DEV physical base addr: %pa\n", 66 &rsrc_start); 67 68 priv_dev->dev = dev; 69 70 priv_dev->eps_supported = 0x000f000f; 71 priv_dev->onchip_tx_buf = 16; 72 priv_dev->onchip_rx_buf = 16; 73 74 ret = cdns2_gadget_init(priv_dev); 75 if (ret) 76 return ret; 77 78 pci_set_drvdata(pdev, priv_dev); 79 80 device_wakeup_enable(&pdev->dev); 81 if (pci_dev_run_wake(pdev)) 82 pm_runtime_put_noidle(&pdev->dev); 83 84 return 0; 85 } 86 87 static void cdns2_pci_remove(struct pci_dev *pdev) 88 { 89 struct cdns2_device *priv_dev = pci_get_drvdata(pdev); 90 91 if (pci_dev_run_wake(pdev)) 92 pm_runtime_get_noresume(&pdev->dev); 93 94 cdns2_gadget_remove(priv_dev); 95 } 96 97 static int cdns2_pci_suspend(struct device *dev) 98 { 99 struct cdns2_device *priv_dev = dev_get_drvdata(dev); 100 101 return cdns2_gadget_suspend(priv_dev); 102 } 103 104 static int cdns2_pci_resume(struct device *dev) 105 { 106 struct cdns2_device *priv_dev = dev_get_drvdata(dev); 107 108 return cdns2_gadget_resume(priv_dev, 1); 109 } 110 111 static const struct dev_pm_ops cdns2_pci_pm_ops = { 112 SYSTEM_SLEEP_PM_OPS(cdns2_pci_suspend, cdns2_pci_resume) 113 }; 114 115 static const struct pci_device_id cdns2_pci_ids[] = { 116 { PCI_DEVICE(PCI_VENDOR_ID_CDNS, PCI_DEVICE_ID_CDNS_USB2), 117 .class = PCI_CLASS_SERIAL_USB_DEVICE }, 118 { 0, } 119 }; 120 121 static struct pci_driver cdns2_pci_driver = { 122 .name = "cdns2-pci", 123 .id_table = cdns2_pci_ids, 124 .probe = cdns2_pci_probe, 125 .remove = cdns2_pci_remove, 126 .driver = { 127 .pm = pm_ptr(&cdns2_pci_pm_ops), 128 } 129 }; 130 131 module_pci_driver(cdns2_pci_driver); 132 MODULE_DEVICE_TABLE(pci, cdns2_pci_ids); 133 134 MODULE_ALIAS("pci:cdns2"); 135 MODULE_AUTHOR("Pawel Laszczak <pawell@cadence.com>"); 136 MODULE_LICENSE("GPL"); 137 MODULE_DESCRIPTION("Cadence CDNS2 PCI driver"); 138