diff options
Diffstat (limited to 'drivers/net/ethernet/freescale/enetc/enetc_ptp.c')
| -rw-r--r-- | drivers/net/ethernet/freescale/enetc/enetc_ptp.c | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/drivers/net/ethernet/freescale/enetc/enetc_ptp.c b/drivers/net/ethernet/freescale/enetc/enetc_ptp.c new file mode 100644 index 000000000000..8c1497e7d9c5 --- /dev/null +++ b/drivers/net/ethernet/freescale/enetc/enetc_ptp.c @@ -0,0 +1,144 @@ +// 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"); |