1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Cadence PCI Glue driver. 4 * 5 * Copyright (C) 2019 Cadence. 6 * 7 * Author: Pawel Laszczak <pawell@cadence.com> 8 * 9 */ 10 11 #include <linux/platform_device.h> 12 #include <linux/dma-mapping.h> 13 #include <linux/kernel.h> 14 #include <linux/module.h> 15 #include <linux/slab.h> 16 #include <linux/pci.h> 17 18 #include "core.h" 19 #include "gadget-export.h" 20 21 #define PCI_BAR_HOST 0 22 #define PCI_BAR_OTG 0 23 #define PCI_BAR_DEV 2 24 25 #define PCI_DEV_FN_HOST_DEVICE 0 26 #define PCI_DEV_FN_OTG 1 27 28 #define PCI_DRIVER_NAME "cdns-pci-usbssp" 29 #define PLAT_DRIVER_NAME "cdns-usbssp" 30 31 #define CDNS_VENDOR_ID 0x17cd 32 #define CDNS_DEVICE_ID 0x0100 33 #define CDNS_DRD_IF (PCI_CLASS_SERIAL_USB << 8 | 0x80) 34 35 static struct pci_dev *cdnsp_get_second_fun(struct pci_dev *pdev) 36 { 37 struct pci_dev *func; 38 39 /* 40 * Gets the second function. 41 * It's little tricky, but this platform has two function. 42 * The fist keeps resources for Host/Device while the second 43 * keeps resources for DRD/OTG. 44 */ 45 func = pci_get_device(pdev->vendor, pdev->device, NULL); 46 if (!func) 47 return NULL; 48 49 if (func->devfn == pdev->devfn) { 50 func = pci_get_device(pdev->vendor, pdev->device, func); 51 if (!func) 52 return NULL; 53 } 54 55 return func; 56 } 57 58 static int cdnsp_pci_probe(struct pci_dev *pdev, 59 const struct pci_device_id *id) 60 { 61 struct device *dev = &pdev->dev; 62 struct pci_dev *func; 63 struct resource *res; 64 struct cdns *cdnsp; 65 int ret; 66 67 /* 68 * For GADGET/HOST PCI (devfn) function number is 0, 69 * for OTG PCI (devfn) function number is 1. 70 */ 71 if (!id || (pdev->devfn != PCI_DEV_FN_HOST_DEVICE && 72 pdev->devfn != PCI_DEV_FN_OTG)) 73 return -EINVAL; 74 75 func = cdnsp_get_second_fun(pdev); 76 if (!func) 77 return -EINVAL; 78 79 if (func->class == PCI_CLASS_SERIAL_USB_XHCI || 80 pdev->class == PCI_CLASS_SERIAL_USB_XHCI) { 81 ret = -EINVAL; 82 goto put_pci; 83 } 84 85 ret = pcim_enable_device(pdev); 86 if (ret) { 87 dev_err(&pdev->dev, "Enabling PCI device has failed %d\n", ret); 88 goto put_pci; 89 } 90 91 pci_set_master(pdev); 92 if (pci_is_enabled(func)) { 93 cdnsp = pci_get_drvdata(func); 94 } else { 95 cdnsp = kzalloc(sizeof(*cdnsp), GFP_KERNEL); 96 if (!cdnsp) { 97 ret = -ENOMEM; 98 goto disable_pci; 99 } 100 } 101 102 /* For GADGET device function number is 0. */ 103 if (pdev->devfn == 0) { 104 resource_size_t rsrc_start, rsrc_len; 105 106 /* Function 0: host(BAR_0) + device(BAR_1).*/ 107 dev_dbg(dev, "Initialize resources\n"); 108 rsrc_start = pci_resource_start(pdev, PCI_BAR_DEV); 109 rsrc_len = pci_resource_len(pdev, PCI_BAR_DEV); 110 res = devm_request_mem_region(dev, rsrc_start, rsrc_len, "dev"); 111 if (!res) { 112 dev_dbg(dev, "controller already in use\n"); 113 ret = -EBUSY; 114 goto free_cdnsp; 115 } 116 117 cdnsp->dev_regs = devm_ioremap(dev, rsrc_start, rsrc_len); 118 if (!cdnsp->dev_regs) { 119 dev_dbg(dev, "error mapping memory\n"); 120 ret = -EFAULT; 121 goto free_cdnsp; 122 } 123 124 cdnsp->dev_irq = pdev->irq; 125 dev_dbg(dev, "USBSS-DEV physical base addr: %pa\n", 126 &rsrc_start); 127 128 res = &cdnsp->xhci_res[0]; 129 res->start = pci_resource_start(pdev, PCI_BAR_HOST); 130 res->end = pci_resource_end(pdev, PCI_BAR_HOST); 131 res->name = "xhci"; 132 res->flags = IORESOURCE_MEM; 133 dev_dbg(dev, "USBSS-XHCI physical base addr: %pa\n", 134 &res->start); 135 136 /* Interrupt for XHCI, */ 137 res = &cdnsp->xhci_res[1]; 138 res->start = pdev->irq; 139 res->name = "host"; 140 res->flags = IORESOURCE_IRQ; 141 } else { 142 res = &cdnsp->otg_res; 143 res->start = pci_resource_start(pdev, PCI_BAR_OTG); 144 res->end = pci_resource_end(pdev, PCI_BAR_OTG); 145 res->name = "otg"; 146 res->flags = IORESOURCE_MEM; 147 dev_dbg(dev, "CDNSP-DRD physical base addr: %pa\n", 148 &res->start); 149 150 /* Interrupt for OTG/DRD. */ 151 cdnsp->otg_irq = pdev->irq; 152 } 153 154 if (pci_is_enabled(func)) { 155 cdnsp->dev = dev; 156 cdnsp->gadget_init = cdnsp_gadget_init; 157 158 ret = cdns_init(cdnsp); 159 if (ret) 160 goto free_cdnsp; 161 } 162 163 pci_set_drvdata(pdev, cdnsp); 164 165 device_wakeup_enable(&pdev->dev); 166 if (pci_dev_run_wake(pdev)) 167 pm_runtime_put_noidle(&pdev->dev); 168 169 return 0; 170 171 free_cdnsp: 172 if (!pci_is_enabled(func)) 173 kfree(cdnsp); 174 175 disable_pci: 176 pci_disable_device(pdev); 177 178 put_pci: 179 pci_dev_put(func); 180 181 return ret; 182 } 183 184 static void cdnsp_pci_remove(struct pci_dev *pdev) 185 { 186 struct cdns *cdnsp; 187 struct pci_dev *func; 188 189 func = cdnsp_get_second_fun(pdev); 190 cdnsp = (struct cdns *)pci_get_drvdata(pdev); 191 192 if (pci_dev_run_wake(pdev)) 193 pm_runtime_get_noresume(&pdev->dev); 194 195 if (pci_is_enabled(func)) { 196 cdns_remove(cdnsp); 197 } else { 198 kfree(cdnsp); 199 } 200 201 pci_dev_put(func); 202 } 203 204 static int __maybe_unused cdnsp_pci_suspend(struct device *dev) 205 { 206 struct cdns *cdns = dev_get_drvdata(dev); 207 208 return cdns_suspend(cdns); 209 } 210 211 static int __maybe_unused cdnsp_pci_resume(struct device *dev) 212 { 213 struct cdns *cdns = dev_get_drvdata(dev); 214 unsigned long flags; 215 int ret; 216 217 spin_lock_irqsave(&cdns->lock, flags); 218 ret = cdns_resume(cdns, 1); 219 spin_unlock_irqrestore(&cdns->lock, flags); 220 221 return ret; 222 } 223 224 static const struct dev_pm_ops cdnsp_pci_pm_ops = { 225 SET_SYSTEM_SLEEP_PM_OPS(cdnsp_pci_suspend, cdnsp_pci_resume) 226 }; 227 228 static const struct pci_device_id cdnsp_pci_ids[] = { 229 { PCI_VENDOR_ID_CDNS, CDNS_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID, 230 PCI_CLASS_SERIAL_USB_DEVICE, PCI_ANY_ID }, 231 { PCI_VENDOR_ID_CDNS, CDNS_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID, 232 CDNS_DRD_IF, PCI_ANY_ID }, 233 { 0, } 234 }; 235 236 static struct pci_driver cdnsp_pci_driver = { 237 .name = "cdnsp-pci", 238 .id_table = &cdnsp_pci_ids[0], 239 .probe = cdnsp_pci_probe, 240 .remove = cdnsp_pci_remove, 241 .driver = { 242 .pm = &cdnsp_pci_pm_ops, 243 } 244 }; 245 246 module_pci_driver(cdnsp_pci_driver); 247 MODULE_DEVICE_TABLE(pci, cdnsp_pci_ids); 248 249 MODULE_ALIAS("pci:cdnsp"); 250 MODULE_AUTHOR("Pawel Laszczak <pawell@cadence.com>"); 251 MODULE_LICENSE("GPL v2"); 252 MODULE_DESCRIPTION("Cadence CDNSP PCI driver"); 253