drivers/net/ethernet/cadence/macb_pci.c

   1 /**
   2  * macb_pci.c - 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         /* sanity check */
  49         if (!id)
  50                 return -EINVAL;
  51
  52         /* enable pci device */
  53         err = pci_enable_device(pdev);
  54         if (err < 0) {
  55                 dev_err(&pdev->dev, "Enabling PCI device has failed: 0x%04X",
  56                         err);
  57                 return -EACCES;
  58         }
  59
  60         pci_set_master(pdev);
  61
  62         /* set up resources */
  63         memset(res, 0x00, sizeof(struct resource) * ARRAY_SIZE(res));
  64         res[0].start = pdev->resource[0].start;
  65         res[0].end = pdev->resource[0].end;
  66         res[0].name = PCI_DRIVER_NAME;
  67         res[0].flags = IORESOURCE_MEM;
  68         res[1].start = pdev->irq;
  69         res[1].name = PCI_DRIVER_NAME;
  70         res[1].flags = IORESOURCE_IRQ;
  71
  72         dev_info(&pdev->dev, "EMAC physical base addr = 0x%p\n",
  73                  (void *)(uintptr_t)pci_resource_start(pdev, 0));
  74
  75         /* set up macb platform data */
  76         memset(&plat_data, 0, sizeof(plat_data));
  77
  78         /* initialize clocks */
  79         plat_data.pclk = clk_register_fixed_rate(&pdev->dev, "pclk", NULL, 0,
  80                                                  GEM_PCLK_RATE);
  81         if (IS_ERR(plat_data.pclk)) {
  82                 err = PTR_ERR(plat_data.pclk);
  83                 goto err_pclk_register;
  84         }
  85
  86         plat_data.hclk = clk_register_fixed_rate(&pdev->dev, "hclk", NULL, 0,
  87                                                  GEM_HCLK_RATE);
  88         if (IS_ERR(plat_data.hclk)) {
  89                 err = PTR_ERR(plat_data.hclk);
  90                 goto err_hclk_register;
  91         }
  92
  93         /* set up platform device info */
  94         memset(&plat_info, 0, sizeof(plat_info));
  95         plat_info.parent = &pdev->dev;
  96         plat_info.fwnode = pdev->dev.fwnode;
  97         plat_info.name = PLAT_DRIVER_NAME;
  98         plat_info.id = pdev->devfn;
  99         plat_info.res = res;
 100         plat_info.num_res = ARRAY_SIZE(res);
 101         plat_info.data = &plat_data;
 102         plat_info.size_data = sizeof(plat_data);
 103         plat_info.dma_mask = DMA_BIT_MASK(32);
 104
 105         /* register platform device */
 106         plat_dev = platform_device_register_full(&plat_info);
 107         if (IS_ERR(plat_dev)) {
 108                 err = PTR_ERR(plat_dev);
 109                 goto err_plat_dev_register;
 110         }
 111
 112         pci_set_drvdata(pdev, plat_dev);
 113
 114         return 0;
 115
 116 err_plat_dev_register:
 117         clk_unregister(plat_data.hclk);
 118
 119 err_hclk_register:
 120         clk_unregister(plat_data.pclk);
 121
 122 err_pclk_register:
 123         pci_disable_device(pdev);
 124         return err;
 125 }
 126
 127 static void macb_remove(struct pci_dev *pdev)
 128 {
 129         struct platform_device *plat_dev = pci_get_drvdata(pdev);
 130         struct macb_platform_data *plat_data = dev_get_platdata(&plat_dev->dev);
 131
 132         platform_device_unregister(plat_dev);
 133         pci_disable_device(pdev);
 134         clk_unregister(plat_data->pclk);
 135         clk_unregister(plat_data->hclk);
 136 }
 137
 138 static struct pci_device_id dev_id_table[] = {
 139         { PCI_DEVICE(CDNS_VENDOR_ID, CDNS_DEVICE_ID), },
 140         { 0, }
 141 };
 142
 143 static struct pci_driver macb_pci_driver = {
 144         .name     = PCI_DRIVER_NAME,
 145         .id_table = dev_id_table,
 146         .probe    = macb_probe,
 147         .remove   = macb_remove,
 148 };
 149
 150 module_pci_driver(macb_pci_driver);
 151 MODULE_DEVICE_TABLE(pci, dev_id_table);
 152 MODULE_LICENSE("GPL");
 153 MODULE_DESCRIPTION("Cadence NIC PCI wrapper");