drivers/net/ethernet/cadence/macb_pci.c

   1 /**
   2  * Cadence GEM PCI wrapper.
   3  *
   4  * Copyright (C) 2016 Cadence Design Systems - http://www.cadence.com
   5  *
   6  * Authors: Rafal Ozieblo <rafalo@cadence.com>
   7  *          Bartosz Folta <bfolta@cadence.com>
   8  *
   9  * This program is free software: you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2  of
  11  * the License as published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #include <linux/clk.h>
  23 #include <linux/clk-provider.h>
  24 #include <linux/etherdevice.h>
  25 #include <linux/module.h>
  26 #include <linux/pci.h>
  27 #include <linux/platform_data/macb.h>
  28 #include <linux/platform_device.h>
  29 #include "macb.h"
  30
  31 #define PCI_DRIVER_NAME "macb_pci"
  32 #define PLAT_DRIVER_NAME "macb"
  33
  34 #define CDNS_VENDOR_ID 0x17cd
  35 #define CDNS_DEVICE_ID 0xe007
  36
  37 #define GEM_PCLK_RATE 50000000
  38 #define GEM_HCLK_RATE 50000000
  39
  40 static int macb_probe(struct pci_dev *pdev, const struct pci_device_id *id)
  41 {
  42         int err;
  43         struct platform_device *plat_dev;
  44         struct platform_device_info plat_info;
  45         struct macb_platform_data plat_data;
  46         struct resource res[2];
  47
  48         /* enable pci device */
  49         err = pcim_enable_device(pdev);
  50         if (err < 0) {
  51                 dev_err(&pdev->dev, "Enabling PCI device has failed: %d", err);
  52                 return err;
  53         }
  54
  55         pci_set_master(pdev);
  56
  57         /* set up resources */
  58         memset(res, 0x00, sizeof(struct resource) * ARRAY_SIZE(res));
  59         res[0].start = pci_resource_start(pdev, 0);
  60         res[0].end = pci_resource_end(pdev, 0);
  61         res[0].name = PCI_DRIVER_NAME;
  62         res[0].flags = IORESOURCE_MEM;
  63         res[1].start = pci_irq_vector(pdev, 0);
  64         res[1].name = PCI_DRIVER_NAME;
  65         res[1].flags = IORESOURCE_IRQ;
  66
  67         dev_info(&pdev->dev, "EMAC physical base addr: %pa\n",
  68                  &res[0].start);
  69
  70         /* set up macb platform data */
  71         memset(&plat_data, 0, sizeof(plat_data));
  72
  73         /* initialize clocks */
  74         plat_data.pclk = clk_register_fixed_rate(&pdev->dev, "pclk", NULL, 0,
  75                                                  GEM_PCLK_RATE);
  76         if (IS_ERR(plat_data.pclk)) {
  77                 err = PTR_ERR(plat_data.pclk);
  78                 goto err_pclk_register;
  79         }
  80
  81         plat_data.hclk = clk_register_fixed_rate(&pdev->dev, "hclk", NULL, 0,
  82                                                  GEM_HCLK_RATE);
  83         if (IS_ERR(plat_data.hclk)) {
  84                 err = PTR_ERR(plat_data.hclk);
  85                 goto err_hclk_register;
  86         }
  87
  88         /* set up platform device info */
  89         memset(&plat_info, 0, sizeof(plat_info));
  90         plat_info.parent = &pdev->dev;
  91         plat_info.fwnode = pdev->dev.fwnode;
  92         plat_info.name = PLAT_DRIVER_NAME;
  93         plat_info.id = pdev->devfn;
  94         plat_info.res = res;
  95         plat_info.num_res = ARRAY_SIZE(res);
  96         plat_info.data = &plat_data;
  97         plat_info.size_data = sizeof(plat_data);
  98         plat_info.dma_mask = pdev->dma_mask;
  99
 100         /* register platform device */
 101         plat_dev = platform_device_register_full(&plat_info);
 102         if (IS_ERR(plat_dev)) {
 103                 err = PTR_ERR(plat_dev);
 104                 goto err_plat_dev_register;
 105         }
 106
 107         pci_set_drvdata(pdev, plat_dev);
 108
 109         return 0;
 110
 111 err_plat_dev_register:
 112         clk_unregister(plat_data.hclk);
 113
 114 err_hclk_register:
 115         clk_unregister(plat_data.pclk);
 116
 117 err_pclk_register:
 118         return err;
 119 }
 120
 121 static void macb_remove(struct pci_dev *pdev)
 122 {
 123         struct platform_device *plat_dev = pci_get_drvdata(pdev);
 124         struct macb_platform_data *plat_data = dev_get_platdata(&plat_dev->dev);
 125
 126         platform_device_unregister(plat_dev);
 127         clk_unregister(plat_data->pclk);
 128         clk_unregister(plat_data->hclk);
 129 }
 130
 131 static const struct pci_device_id dev_id_table[] = {
 132         { PCI_DEVICE(CDNS_VENDOR_ID, CDNS_DEVICE_ID), },
 133         { 0, }
 134 };
 135
 136 static struct pci_driver macb_pci_driver = {
 137         .name     = PCI_DRIVER_NAME,
 138         .id_table = dev_id_table,
 139         .probe    = macb_probe,
 140         .remove   = macb_remove,
 141 };
 142
 143 module_pci_driver(macb_pci_driver);
 144 MODULE_DEVICE_TABLE(pci, dev_id_table);
 145 MODULE_LICENSE("GPL");
 146 MODULE_DESCRIPTION("Cadence NIC PCI wrapper");