drivers/usb/cdns3/cdns3-pci-wrap.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Cadence USBSS PCI Glue driver
   4  *
   5  * Copyright (C) 2018-2019 Cadence.
   6  *
   7  * Author: Pawel Laszczak <pawell@cadence.com>
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/pci.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/dma-mapping.h>
  15 #include <linux/slab.h>
  16
  17 struct cdns3_wrap {
  18         struct platform_device *plat_dev;
  19         struct resource dev_res[6];
  20         int devfn;
  21 };
  22
  23 #define RES_IRQ_HOST_ID         0
  24 #define RES_IRQ_PERIPHERAL_ID   1
  25 #define RES_IRQ_OTG_ID          2
  26 #define RES_HOST_ID             3
  27 #define RES_DEV_ID              4
  28 #define RES_DRD_ID              5
  29
  30 #define PCI_BAR_HOST            0
  31 #define PCI_BAR_DEV             2
  32 #define PCI_BAR_OTG             0
  33
  34 #define PCI_DEV_FN_HOST_DEVICE  0
  35 #define PCI_DEV_FN_OTG          1
  36
  37 #define PCI_DRIVER_NAME         "cdns3-pci-usbss"
  38 #define PLAT_DRIVER_NAME        "cdns-usb3"
  39
  40 static struct pci_dev *cdns3_get_second_fun(struct pci_dev *pdev)
  41 {
  42         struct pci_dev *func;
  43
  44         /*
  45          * Gets the second function.
  46          * It's little tricky, but this platform has two function.
  47          * The fist keeps resources for Host/Device while the second
  48          * keeps resources for DRD/OTG.
  49          */
  50         func = pci_get_device(pdev->vendor, pdev->device, NULL);
  51         if (unlikely(!func))
  52                 return NULL;
  53
  54         if (func->devfn == pdev->devfn) {
  55                 func = pci_get_device(pdev->vendor, pdev->device, func);
  56                 if (unlikely(!func))
  57                         return NULL;
  58         }
  59
  60         if (func->devfn != PCI_DEV_FN_HOST_DEVICE &&
  61             func->devfn != PCI_DEV_FN_OTG) {
  62                 return NULL;
  63         }
  64
  65         return func;
  66 }
  67
  68 static int cdns3_pci_probe(struct pci_dev *pdev,
  69                            const struct pci_device_id *id)
  70 {
  71         struct platform_device_info plat_info;
  72         struct cdns3_wrap *wrap;
  73         struct resource *res;
  74         struct pci_dev *func;
  75         int err;
  76
  77         /*
  78          * for GADGET/HOST PCI (devfn) function number is 0,
  79          * for OTG PCI (devfn) function number is 1
  80          */
  81         if (!id || (pdev->devfn != PCI_DEV_FN_HOST_DEVICE &&
  82                     pdev->devfn != PCI_DEV_FN_OTG))
  83                 return -EINVAL;
  84
  85         func = cdns3_get_second_fun(pdev);
  86         if (unlikely(!func))
  87                 return -EINVAL;
  88
  89         err = pcim_enable_device(pdev);
  90         if (err) {
  91                 dev_err(&pdev->dev, "Enabling PCI device has failed %d\n", err);
  92                 return err;
  93         }
  94
  95         pci_set_master(pdev);
  96
  97         if (pci_is_enabled(func)) {
  98                 wrap = pci_get_drvdata(func);
  99         } else {
 100                 wrap = kzalloc(sizeof(*wrap), GFP_KERNEL);
 101                 if (!wrap) {
 102                         pci_disable_device(pdev);
 103                         return -ENOMEM;
 104                 }
 105         }
 106
 107         res = wrap->dev_res;
 108
 109         if (pdev->devfn == PCI_DEV_FN_HOST_DEVICE) {
 110                 /* function 0: host(BAR_0) + device(BAR_1).*/
 111                 dev_dbg(&pdev->dev, "Initialize Device resources\n");
 112                 res[RES_DEV_ID].start = pci_resource_start(pdev, PCI_BAR_DEV);
 113                 res[RES_DEV_ID].end =   pci_resource_end(pdev, PCI_BAR_DEV);
 114                 res[RES_DEV_ID].name = "dev";
 115                 res[RES_DEV_ID].flags = IORESOURCE_MEM;
 116                 dev_dbg(&pdev->dev, "USBSS-DEV physical base addr: %pa\n",
 117                         &res[RES_DEV_ID].start);
 118
 119                 res[RES_HOST_ID].start = pci_resource_start(pdev, PCI_BAR_HOST);
 120                 res[RES_HOST_ID].end = pci_resource_end(pdev, PCI_BAR_HOST);
 121                 res[RES_HOST_ID].name = "xhci";
 122                 res[RES_HOST_ID].flags = IORESOURCE_MEM;
 123                 dev_dbg(&pdev->dev, "USBSS-XHCI physical base addr: %pa\n",
 124                         &res[RES_HOST_ID].start);
 125
 126                 /* Interrupt for XHCI */
 127                 wrap->dev_res[RES_IRQ_HOST_ID].start = pdev->irq;
 128                 wrap->dev_res[RES_IRQ_HOST_ID].name = "host";
 129                 wrap->dev_res[RES_IRQ_HOST_ID].flags = IORESOURCE_IRQ;
 130
 131                 /* Interrupt device. It's the same as for HOST. */
 132                 wrap->dev_res[RES_IRQ_PERIPHERAL_ID].start = pdev->irq;
 133                 wrap->dev_res[RES_IRQ_PERIPHERAL_ID].name = "peripheral";
 134                 wrap->dev_res[RES_IRQ_PERIPHERAL_ID].flags = IORESOURCE_IRQ;
 135         } else {
 136                 res[RES_DRD_ID].start = pci_resource_start(pdev, PCI_BAR_OTG);
 137                 res[RES_DRD_ID].end =   pci_resource_end(pdev, PCI_BAR_OTG);
 138                 res[RES_DRD_ID].name = "otg";
 139                 res[RES_DRD_ID].flags = IORESOURCE_MEM;
 140                 dev_dbg(&pdev->dev, "USBSS-DRD physical base addr: %pa\n",
 141                         &res[RES_DRD_ID].start);
 142
 143                 /* Interrupt for OTG/DRD. */
 144                 wrap->dev_res[RES_IRQ_OTG_ID].start = pdev->irq;
 145                 wrap->dev_res[RES_IRQ_OTG_ID].name = "otg";
 146                 wrap->dev_res[RES_IRQ_OTG_ID].flags = IORESOURCE_IRQ;
 147         }
 148
 149         if (pci_is_enabled(func)) {
 150                 /* set up platform device info */
 151                 memset(&plat_info, 0, sizeof(plat_info));
 152                 plat_info.parent = &pdev->dev;
 153                 plat_info.fwnode = pdev->dev.fwnode;
 154                 plat_info.name = PLAT_DRIVER_NAME;
 155                 plat_info.id = pdev->devfn;
 156                 wrap->devfn  = pdev->devfn;
 157                 plat_info.res = wrap->dev_res;
 158                 plat_info.num_res = ARRAY_SIZE(wrap->dev_res);
 159                 plat_info.dma_mask = pdev->dma_mask;
 160                 /* register platform device */
 161                 wrap->plat_dev = platform_device_register_full(&plat_info);
 162                 if (IS_ERR(wrap->plat_dev)) {
 163                         pci_disable_device(pdev);
 164                         err = PTR_ERR(wrap->plat_dev);
 165                         kfree(wrap);
 166                         return err;
 167                 }
 168         }
 169
 170         pci_set_drvdata(pdev, wrap);
 171         return err;
 172 }
 173
 174 static void cdns3_pci_remove(struct pci_dev *pdev)
 175 {
 176         struct cdns3_wrap *wrap;
 177         struct pci_dev *func;
 178
 179         func = cdns3_get_second_fun(pdev);
 180
 181         wrap = (struct cdns3_wrap *)pci_get_drvdata(pdev);
 182         if (wrap->devfn == pdev->devfn)
 183                 platform_device_unregister(wrap->plat_dev);
 184
 185         if (!pci_is_enabled(func))
 186                 kfree(wrap);
 187 }
 188
 189 static const struct pci_device_id cdns3_pci_ids[] = {
 190         { PCI_VDEVICE(CDNS, PCI_DEVICE_ID_CDNS_USBSS) },
 191         { 0, }
 192 };
 193
 194 static struct pci_driver cdns3_pci_driver = {
 195         .name = PCI_DRIVER_NAME,
 196         .id_table = cdns3_pci_ids,
 197         .probe = cdns3_pci_probe,
 198         .remove = cdns3_pci_remove,
 199 };
 200
 201 module_pci_driver(cdns3_pci_driver);
 202 MODULE_DEVICE_TABLE(pci, cdns3_pci_ids);
 203
 204 MODULE_AUTHOR("Pawel Laszczak <pawell@cadence.com>");
 205 MODULE_LICENSE("GPL v2");
 206 MODULE_DESCRIPTION("Cadence USBSS PCI wrapper");