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

   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
  40static 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
 111err_plat_dev_register:
 112        clk_unregister(plat_data.hclk);
 113
 114err_hclk_register:
 115        clk_unregister(plat_data.pclk);
 116
 117err_pclk_register:
 118        return err;
 119}
 120
 121static 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
 131static const struct pci_device_id dev_id_table[] = {
 132        { PCI_DEVICE(CDNS_VENDOR_ID, CDNS_DEVICE_ID), },
 133        { 0, }
 134};
 135
 136static 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
 143module_pci_driver(macb_pci_driver);
 144MODULE_DEVICE_TABLE(pci, dev_id_table);
 145MODULE_LICENSE("GPL");
 146MODULE_DESCRIPTION("Cadence NIC PCI wrapper");
 147