drivers/net/ethernet/cadence/macb_pci.c

   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
  29 static 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
 100 err_plat_dev_register:
 101         clk_unregister(plat_data.hclk);
 102
 103 err_hclk_register:
 104         clk_unregister(plat_data.pclk);
 105
 106 err_pclk_register:
 107         return err;
 108 }
 109
 110 static 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
 120 static const struct pci_device_id dev_id_table[] = {
 121         { PCI_DEVICE(CDNS_VENDOR_ID, CDNS_DEVICE_ID), },
 122         { 0, }
 123 };
 124
 125 static 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
 132 module_pci_driver(macb_pci_driver);
 133 MODULE_DEVICE_TABLE(pci, dev_id_table);
 134 MODULE_LICENSE("GPL");
 135 MODULE_DESCRIPTION("Cadence NIC PCI wrapper");