LXR linux/drivers/net/ethernet/cadence/macb

   1// SPDX-License-Identifier: GPL-2.0-only
   2/**
   3 * Cadence GEM PCI wrapper.
   4 *
   5 * Copyright (C) 2016 Cadence Design Systems - http://www.cadence.com
   6 *
   7 * Authors: Rafal Ozieblo <rafalo@cadence.com>
   8 *          Bartosz Folta <bfolta@cadence.com>
   9 */
  10
  11#include <linux/clk.h>
  12#include <linux/clk-provider.h>
  13#include <linux/etherdevice.h>
  14#include <linux/module.h>
  15#include <linux/pci.h>
  16#include <linux/platform_data/macb.h>
  17#include <linux/platform_device.h>
  18#include "macb.h"
  19
  20#define PCI_DRIVER_NAME "macb_pci"
  21#define PLAT_DRIVER_NAME "macb"
  22
  23#define CDNS_VENDOR_ID 0x17cd
  24#define CDNS_DEVICE_ID 0xe007
  25
  26#define GEM_PCLK_RATE 50000000
  27#define GEM_HCLK_RATE 50000000
  28
  29static int macb_probe(struct pci_dev *pdev, const struct pci_device_id *id)
  30{
  31        int err;
  32        struct platform_device *plat_dev;
  33        struct platform_device_info plat_info;
  34        struct macb_platform_data plat_data;
  35        struct resource res[2];
  36
  37        /* enable pci device */
  38        err = pcim_enable_device(pdev);
  39        if (err < 0) {
  40                dev_err(&pdev->dev, "Enabling PCI device has failed: %d", err);
  41                return err;
  42        }
  43
  44        pci_set_master(pdev);
  45
  46        /* set up resources */
  47        memset(res, 0x00, sizeof(struct resource) * ARRAY_SIZE(res));
  48        res[0].start = pci_resource_start(pdev, 0);
  49        res[0].end = pci_resource_end(pdev, 0);
  50        res[0].name = PCI_DRIVER_NAME;
  51        res[0].flags = IORESOURCE_MEM;
  52        res[1].start = pci_irq_vector(pdev, 0);
  53        res[1].name = PCI_DRIVER_NAME;
  54        res[1].flags = IORESOURCE_IRQ;
  55
  56        dev_info(&pdev->dev, "EMAC physical base addr: %pa\n",
  57                 &res[0].start);
  58
  59        /* set up macb platform data */
  60        memset(&plat_data, 0, sizeof(plat_data));
  61
  62        /* initialize clocks */
  63        plat_data.pclk = clk_register_fixed_rate(&pdev->dev, "pclk", NULL, 0,
  64                                                 GEM_PCLK_RATE);
  65        if (IS_ERR(plat_data.pclk)) {
  66                err = PTR_ERR(plat_data.pclk);
  67                goto err_pclk_register;
  68        }
  69
  70        plat_data.hclk = clk_register_fixed_rate(&pdev->dev, "hclk", NULL, 0,
  71                                                 GEM_HCLK_RATE);
  72        if (IS_ERR(plat_data.hclk)) {
  73                err = PTR_ERR(plat_data.hclk);
  74                goto err_hclk_register;
  75        }
  76
  77        /* set up platform device info */
  78        memset(&plat_info, 0, sizeof(plat_info));
  79        plat_info.parent = &pdev->dev;
  80        plat_info.fwnode = pdev->dev.fwnode;
  81        plat_info.name = PLAT_DRIVER_NAME;
  82        plat_info.id = pdev->devfn;
  83        plat_info.res = res;
  84        plat_info.num_res = ARRAY_SIZE(res);
  85        plat_info.data = &plat_data;
  86        plat_info.size_data = sizeof(plat_data);
  87        plat_info.dma_mask = pdev->dma_mask;
  88
  89        /* register platform device */
  90        plat_dev = platform_device_register_full(&plat_info);
  91        if (IS_ERR(plat_dev)) {
  92                err = PTR_ERR(plat_dev);
  93                goto err_plat_dev_register;
  94        }
  95
  96        pci_set_drvdata(pdev, plat_dev);
  97
  98        return 0;
  99
 100err_plat_dev_register:
 101        clk_unregister(plat_data.hclk);
 102
 103err_hclk_register:
 104        clk_unregister(plat_data.pclk);
 105
 106err_pclk_register:
 107        return err;
 108}
 109
 110static void macb_remove(struct pci_dev *pdev)
 111{
 112        struct platform_device *plat_dev = pci_get_drvdata(pdev);
 113        struct macb_platform_data *plat_data = dev_get_platdata(&plat_dev->dev);
 114
 115        platform_device_unregister(plat_dev);
 116        clk_unregister(plat_data->pclk);
 117        clk_unregister(plat_data->hclk);
 118}
 119
 120static const struct pci_device_id dev_id_table[] = {
 121        { PCI_DEVICE(CDNS_VENDOR_ID, CDNS_DEVICE_ID), },
 122        { 0, }
 123};
 124
 125static struct pci_driver macb_pci_driver = {
 126        .name     = PCI_DRIVER_NAME,
 127        .id_table = dev_id_table,
 128        .probe    = macb_probe,
 129        .remove   = macb_remove,
 130};
 131
 132module_pci_driver(macb_pci_driver);
 133MODULE_DEVICE_TABLE(pci, dev_id_table);
 134MODULE_LICENSE("GPL");
 135MODULE_DESCRIPTION("Cadence NIC PCI wrapper");
 136