drivers/usb/gadget/udc/bdc/bdc_pci.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * bdc_pci.c - BRCM BDC USB3.0 device controller PCI interface file.
   4  *
   5  * Copyright (C) 2014 Broadcom Corporation
   6  *
   7  * Author: Ashwini Pahuja
   8  *
   9  * Based on drivers under drivers/usb/
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/slab.h>
  15 #include <linux/pci.h>
  16 #include <linux/pci_ids.h>
  17 #include <linux/platform_device.h>
  18
  19 #include "bdc.h"
  20
  21 #define BDC_PCI_PID 0x1570
  22
  23 struct bdc_pci {
  24         struct device *dev;
  25         struct platform_device *bdc;
  26 };
  27
  28 static int bdc_setup_msi(struct pci_dev *pci)
  29 {
  30         int ret;
  31
  32         ret = pci_enable_msi(pci);
  33         if (ret) {
  34                 pr_err("failed to allocate MSI entry\n");
  35                 return ret;
  36         }
  37
  38         return ret;
  39 }
  40
  41 static int bdc_pci_probe(struct pci_dev *pci, const struct pci_device_id *id)
  42 {
  43         struct resource res[2];
  44         struct platform_device *bdc;
  45         struct bdc_pci *glue;
  46         int ret = -ENOMEM;
  47
  48         glue = devm_kzalloc(&pci->dev, sizeof(*glue), GFP_KERNEL);
  49         if (!glue)
  50                 return -ENOMEM;
  51
  52         glue->dev = &pci->dev;
  53         ret = pci_enable_device(pci);
  54         if (ret) {
  55                 dev_err(&pci->dev, "failed to enable pci device\n");
  56                 return -ENODEV;
  57         }
  58         pci_set_master(pci);
  59
  60         bdc = platform_device_alloc(BRCM_BDC_NAME, PLATFORM_DEVID_AUTO);
  61         if (!bdc)
  62                 return -ENOMEM;
  63
  64         memset(res, 0x00, sizeof(struct resource) * ARRAY_SIZE(res));
  65         bdc_setup_msi(pci);
  66
  67         res[0].start    = pci_resource_start(pci, 0);
  68         res[0].end      = pci_resource_end(pci, 0);
  69         res[0].name     = BRCM_BDC_NAME;
  70         res[0].flags    = IORESOURCE_MEM;
  71
  72         res[1].start    = pci->irq;
  73         res[1].name     = BRCM_BDC_NAME;
  74         res[1].flags    = IORESOURCE_IRQ;
  75
  76         ret = platform_device_add_resources(bdc, res, ARRAY_SIZE(res));
  77         if (ret) {
  78                 dev_err(&pci->dev,
  79                         "couldn't add resources to bdc device\n");
  80                 platform_device_put(bdc);
  81                 return ret;
  82         }
  83
  84         pci_set_drvdata(pci, glue);
  85
  86         dma_set_coherent_mask(&bdc->dev, pci->dev.coherent_dma_mask);
  87
  88         bdc->dev.dma_mask = pci->dev.dma_mask;
  89         bdc->dev.dma_parms = pci->dev.dma_parms;
  90         bdc->dev.parent = &pci->dev;
  91         glue->bdc = bdc;
  92
  93         ret = platform_device_add(bdc);
  94         if (ret) {
  95                 dev_err(&pci->dev, "failed to register bdc device\n");
  96                 platform_device_put(bdc);
  97                 return ret;
  98         }
  99
 100         return 0;
 101 }
 102
 103 static void bdc_pci_remove(struct pci_dev *pci)
 104 {
 105         struct bdc_pci *glue = pci_get_drvdata(pci);
 106
 107         platform_device_unregister(glue->bdc);
 108         pci_disable_msi(pci);
 109 }
 110
 111 static struct pci_device_id bdc_pci_id_table[] = {
 112         { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, BDC_PCI_PID), },
 113         {} /* Terminating Entry */
 114 };
 115
 116 MODULE_DEVICE_TABLE(pci, bdc_pci_id_table);
 117
 118 static struct pci_driver bdc_pci_driver = {
 119         .name = "bdc-pci",
 120         .id_table = bdc_pci_id_table,
 121         .probe = bdc_pci_probe,
 122         .remove = bdc_pci_remove,
 123 };
 124
 125 MODULE_AUTHOR("Ashwini Pahuja <ashwini.linux@gmail.com>");
 126 MODULE_LICENSE("GPL");
 127 MODULE_DESCRIPTION("BRCM BDC USB3 PCI Glue layer");
 128 module_pci_driver(bdc_pci_driver);