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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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83a77e9ec4
There are hardware PCI implementations of Cadence GEM network controller. This patch will allow to use such hardware with reuse of existing Platform Driver. Signed-off-by: Bartosz Folta <bfolta@cadence.com> Signed-off-by: David S. Miller <davem@davemloft.net>
154 lines
4.0 KiB
C
154 lines
4.0 KiB
C
/**
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* macb_pci.c - Cadence GEM PCI wrapper.
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*
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* Copyright (C) 2016 Cadence Design Systems - http://www.cadence.com
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*
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* Authors: Rafal Ozieblo <rafalo@cadence.com>
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* Bartosz Folta <bfolta@cadence.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 of
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* the License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/clk.h>
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#include <linux/clk-provider.h>
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#include <linux/etherdevice.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/platform_data/macb.h>
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#include <linux/platform_device.h>
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#include "macb.h"
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#define PCI_DRIVER_NAME "macb_pci"
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#define PLAT_DRIVER_NAME "macb"
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#define CDNS_VENDOR_ID 0x17cd
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#define CDNS_DEVICE_ID 0xe007
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#define GEM_PCLK_RATE 50000000
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#define GEM_HCLK_RATE 50000000
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static int macb_probe(struct pci_dev *pdev, const struct pci_device_id *id)
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{
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int err;
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struct platform_device *plat_dev;
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struct platform_device_info plat_info;
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struct macb_platform_data plat_data;
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struct resource res[2];
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/* sanity check */
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if (!id)
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return -EINVAL;
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/* enable pci device */
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err = pci_enable_device(pdev);
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if (err < 0) {
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dev_err(&pdev->dev, "Enabling PCI device has failed: 0x%04X",
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err);
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return -EACCES;
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}
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pci_set_master(pdev);
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/* set up resources */
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memset(res, 0x00, sizeof(struct resource) * ARRAY_SIZE(res));
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res[0].start = pdev->resource[0].start;
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res[0].end = pdev->resource[0].end;
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res[0].name = PCI_DRIVER_NAME;
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res[0].flags = IORESOURCE_MEM;
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res[1].start = pdev->irq;
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res[1].name = PCI_DRIVER_NAME;
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res[1].flags = IORESOURCE_IRQ;
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dev_info(&pdev->dev, "EMAC physical base addr = 0x%p\n",
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(void *)(uintptr_t)pci_resource_start(pdev, 0));
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/* set up macb platform data */
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memset(&plat_data, 0, sizeof(plat_data));
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/* initialize clocks */
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plat_data.pclk = clk_register_fixed_rate(&pdev->dev, "pclk", NULL, 0,
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GEM_PCLK_RATE);
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if (IS_ERR(plat_data.pclk)) {
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err = PTR_ERR(plat_data.pclk);
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goto err_pclk_register;
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}
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plat_data.hclk = clk_register_fixed_rate(&pdev->dev, "hclk", NULL, 0,
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GEM_HCLK_RATE);
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if (IS_ERR(plat_data.hclk)) {
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err = PTR_ERR(plat_data.hclk);
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goto err_hclk_register;
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}
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/* set up platform device info */
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memset(&plat_info, 0, sizeof(plat_info));
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plat_info.parent = &pdev->dev;
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plat_info.fwnode = pdev->dev.fwnode;
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plat_info.name = PLAT_DRIVER_NAME;
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plat_info.id = pdev->devfn;
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plat_info.res = res;
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plat_info.num_res = ARRAY_SIZE(res);
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plat_info.data = &plat_data;
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plat_info.size_data = sizeof(plat_data);
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plat_info.dma_mask = DMA_BIT_MASK(32);
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/* register platform device */
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plat_dev = platform_device_register_full(&plat_info);
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if (IS_ERR(plat_dev)) {
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err = PTR_ERR(plat_dev);
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goto err_plat_dev_register;
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}
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pci_set_drvdata(pdev, plat_dev);
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return 0;
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err_plat_dev_register:
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clk_unregister(plat_data.hclk);
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err_hclk_register:
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clk_unregister(plat_data.pclk);
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err_pclk_register:
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pci_disable_device(pdev);
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return err;
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}
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static void macb_remove(struct pci_dev *pdev)
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{
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struct platform_device *plat_dev = pci_get_drvdata(pdev);
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struct macb_platform_data *plat_data = dev_get_platdata(&plat_dev->dev);
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platform_device_unregister(plat_dev);
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pci_disable_device(pdev);
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clk_unregister(plat_data->pclk);
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clk_unregister(plat_data->hclk);
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}
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static struct pci_device_id dev_id_table[] = {
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{ PCI_DEVICE(CDNS_VENDOR_ID, CDNS_DEVICE_ID), },
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{ 0, }
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};
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static struct pci_driver macb_pci_driver = {
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.name = PCI_DRIVER_NAME,
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.id_table = dev_id_table,
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.probe = macb_probe,
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.remove = macb_remove,
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};
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module_pci_driver(macb_pci_driver);
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MODULE_DEVICE_TABLE(pci, dev_id_table);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Cadence NIC PCI wrapper");
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