drivers/net/ethernet/cadence/macb_pci.c

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