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Commit 19971f5e authored by Yangbo Lu's avatar Yangbo Lu Committed by David S. Miller
Browse files

enetc: add PTP clock driver 



This patch is to add PTP clock driver for ENETC.
The driver reused QorIQ PTP clock driver.

Signed-off-by: default avatarYangbo Lu <yangbo.lu@nxp.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent ad6e1be6

drivers/net/ethernet/freescale/enetc/Kconfig

+12 −0
Original line number Diff line number Diff line
@@ -17,3 +17,15 @@ config FSL_ENETC_VF 
	  virtual function (VF) devices enabled by the ENETC PF driver.



	  If compiled as module (M), the module name is fsl-enetc-vf.



config FSL_ENETC_PTP_CLOCK

	tristate "ENETC PTP clock driver"

	depends on PTP_1588_CLOCK_QORIQ && (FSL_ENETC || FSL_ENETC_VF)

	default y

	help

	  This driver adds support for using the ENETC 1588 timer

	  as a PTP clock. This clock is only useful if your PTP

	  programs are getting hardware time stamps on the PTP Ethernet

	  packets using the SO_TIMESTAMPING API.



	  If compiled as module (M), the module name is fsl-enetc-ptp.

drivers/net/ethernet/freescale/enetc/Makefile

+3 −0
Original line number Diff line number Diff line
@@ -13,3 +13,6 @@ fsl-enetc-vf-$(CONFIG_FSL_ENETC_VF) += enetc.o enetc_cbdr.o \ 
				       enetc_ethtool.o

fsl-enetc-vf-objs := enetc_vf.o $(fsl-enetc-vf-y)

endif



obj-$(CONFIG_FSL_ENETC_PTP_CLOCK) += fsl-enetc-ptp.o

fsl-enetc-ptp-$(CONFIG_FSL_ENETC_PTP_CLOCK) += enetc_ptp.o

drivers/net/ethernet/freescale/enetc/enetc_hw.h

+3 −2
Original line number Diff line number Diff line
@@ -6,6 +6,7 @@ 
/* ENETC device IDs */

#define ENETC_DEV_ID_PF		0xe100

#define ENETC_DEV_ID_VF		0xef00

#define ENETC_DEV_ID_PTP	0xee02



/* ENETC register block BAR */

#define ENETC_BAR_REGS	0

drivers/net/ethernet/freescale/enetc/enetc_ptp.c

0 → 100644
+144 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)

/* Copyright 2019 NXP */



#include <linux/module.h>

#include <linux/of.h>

#include <linux/fsl/ptp_qoriq.h>



#include "enetc.h"



static struct ptp_clock_info enetc_ptp_caps = {

	.owner		= THIS_MODULE,

	.name		= "ENETC PTP clock",

	.max_adj	= 512000,

	.n_alarm	= 0,

	.n_ext_ts	= 2,

	.n_per_out	= 0,

	.n_pins		= 0,

	.pps		= 1,

	.adjfine	= ptp_qoriq_adjfine,

	.adjtime	= ptp_qoriq_adjtime,

	.gettime64	= ptp_qoriq_gettime,

	.settime64	= ptp_qoriq_settime,

	.enable		= ptp_qoriq_enable,

};



static int enetc_ptp_probe(struct pci_dev *pdev,

			   const struct pci_device_id *ent)

{

	struct ptp_qoriq *ptp_qoriq;

	void __iomem *base;

	int err, len, n;



	if (pdev->dev.of_node && !of_device_is_available(pdev->dev.of_node)) {

		dev_info(&pdev->dev, "device is disabled, skipping\n");

		return -ENODEV;

	}



	err = pci_enable_device_mem(pdev);

	if (err) {

		dev_err(&pdev->dev, "device enable failed\n");

		return err;

	}



	/* set up for high or low dma */

	err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));

	if (err) {

		err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));

		if (err) {

			dev_err(&pdev->dev,

				"DMA configuration failed: 0x%x\n", err);

			goto err_dma;

		}

	}



	err = pci_request_mem_regions(pdev, KBUILD_MODNAME);

	if (err) {

		dev_err(&pdev->dev, "pci_request_regions failed err=%d\n", err);

		goto err_pci_mem_reg;

	}



	pci_set_master(pdev);



	ptp_qoriq = kzalloc(sizeof(*ptp_qoriq), GFP_KERNEL);

	if (!ptp_qoriq) {

		err = -ENOMEM;

		goto err_alloc_ptp;

	}



	len = pci_resource_len(pdev, ENETC_BAR_REGS);



	base = ioremap(pci_resource_start(pdev, ENETC_BAR_REGS), len);

	if (!base) {

		err = -ENXIO;

		dev_err(&pdev->dev, "ioremap() failed\n");

		goto err_ioremap;

	}



	/* Allocate 1 interrupt */

	n = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSIX);

	if (n != 1) {

		err = -EPERM;

		goto err_irq;

	}



	ptp_qoriq->irq = pci_irq_vector(pdev, 0);



	err = request_irq(ptp_qoriq->irq, ptp_qoriq_isr, 0, DRIVER, ptp_qoriq);

	if (err) {

		dev_err(&pdev->dev, "request_irq() failed!\n");

		goto err_irq;

	}



	ptp_qoriq->dev = &pdev->dev;



	err = ptp_qoriq_init(ptp_qoriq, base, enetc_ptp_caps);

	if (err)

		goto err_no_clock;



	pci_set_drvdata(pdev, ptp_qoriq);



	return 0;



err_no_clock:

	free_irq(ptp_qoriq->irq, ptp_qoriq);

err_irq:

	iounmap(base);

err_ioremap:

	kfree(ptp_qoriq);

err_alloc_ptp:

	pci_release_mem_regions(pdev);

err_pci_mem_reg:

err_dma:

	pci_disable_device(pdev);



	return err;

}



static void enetc_ptp_remove(struct pci_dev *pdev)

{

	struct ptp_qoriq *ptp_qoriq = pci_get_drvdata(pdev);



	ptp_qoriq_free(ptp_qoriq);

	kfree(ptp_qoriq);



	pci_release_mem_regions(pdev);

	pci_disable_device(pdev);

}



static const struct pci_device_id enetc_ptp_id_table[] = {

	{ PCI_DEVICE(PCI_VENDOR_ID_FREESCALE, ENETC_DEV_ID_PTP) },

	{ 0, } /* End of table. */

};

MODULE_DEVICE_TABLE(pci, enetc_ptp_id_table);



static struct pci_driver enetc_ptp_driver = {

	.name = KBUILD_MODNAME,

	.id_table = enetc_ptp_id_table,

	.probe = enetc_ptp_probe,

	.remove = enetc_ptp_remove,

};

module_pci_driver(enetc_ptp_driver);



MODULE_DESCRIPTION("ENETC PTP clock driver");

MODULE_LICENSE("Dual BSD/GPL");