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

   1 // SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
   2 /* Copyright 2019 NXP */
   3
   4 #include <linux/module.h>
   5 #include <linux/of.h>
   6 #include <linux/fsl/ptp_qoriq.h>
   7
   8 #include "enetc.h"
   9
  10 int enetc_phc_index = -1;
  11 EXPORT_SYMBOL(enetc_phc_index);
  12
  13 static struct ptp_clock_info enetc_ptp_caps = {
  14         .owner          = THIS_MODULE,
  15         .name           = "ENETC PTP clock",
  16         .max_adj        = 512000,
  17         .n_alarm        = 0,
  18         .n_ext_ts       = 2,
  19         .n_per_out      = 0,
  20         .n_pins         = 0,
  21         .pps            = 1,
  22         .adjfine        = ptp_qoriq_adjfine,
  23         .adjtime        = ptp_qoriq_adjtime,
  24         .gettime64      = ptp_qoriq_gettime,
  25         .settime64      = ptp_qoriq_settime,
  26         .enable         = ptp_qoriq_enable,
  27 };
  28
  29 static int enetc_ptp_probe(struct pci_dev *pdev,
  30                            const struct pci_device_id *ent)
  31 {
  32         struct ptp_qoriq *ptp_qoriq;
  33         void __iomem *base;
  34         int err, len, n;
  35
  36         if (pdev->dev.of_node && !of_device_is_available(pdev->dev.of_node)) {
  37                 dev_info(&pdev->dev, "device is disabled, skipping\n");
  38                 return -ENODEV;
  39         }
  40
  41         err = pci_enable_device_mem(pdev);
  42         if (err) {
  43                 dev_err(&pdev->dev, "device enable failed\n");
  44                 return err;
  45         }
  46
  47         /* set up for high or low dma */
  48         err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
  49         if (err) {
  50                 err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
  51                 if (err) {
  52                         dev_err(&pdev->dev,
  53                                 "DMA configuration failed: 0x%x\n", err);
  54                         goto err_dma;
  55                 }
  56         }
  57
  58         err = pci_request_mem_regions(pdev, KBUILD_MODNAME);
  59         if (err) {
  60                 dev_err(&pdev->dev, "pci_request_regions failed err=%d\n", err);
  61                 goto err_pci_mem_reg;
  62         }
  63
  64         pci_set_master(pdev);
  65
  66         ptp_qoriq = kzalloc(sizeof(*ptp_qoriq), GFP_KERNEL);
  67         if (!ptp_qoriq) {
  68                 err = -ENOMEM;
  69                 goto err_alloc_ptp;
  70         }
  71
  72         len = pci_resource_len(pdev, ENETC_BAR_REGS);
  73
  74         base = ioremap(pci_resource_start(pdev, ENETC_BAR_REGS), len);
  75         if (!base) {
  76                 err = -ENXIO;
  77                 dev_err(&pdev->dev, "ioremap() failed\n");
  78                 goto err_ioremap;
  79         }
  80
  81         /* Allocate 1 interrupt */
  82         n = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSIX);
  83         if (n != 1) {
  84                 err = -EPERM;
  85                 goto err_irq;
  86         }
  87
  88         ptp_qoriq->irq = pci_irq_vector(pdev, 0);
  89
  90         err = request_irq(ptp_qoriq->irq, ptp_qoriq_isr, 0, DRIVER, ptp_qoriq);
  91         if (err) {
  92                 dev_err(&pdev->dev, "request_irq() failed!\n");
  93                 goto err_irq;
  94         }
  95
  96         ptp_qoriq->dev = &pdev->dev;
  97
  98         err = ptp_qoriq_init(ptp_qoriq, base, &enetc_ptp_caps);
  99         if (err)
 100                 goto err_no_clock;
 101
 102         enetc_phc_index = ptp_qoriq->phc_index;
 103         pci_set_drvdata(pdev, ptp_qoriq);
 104
 105         return 0;
 106
 107 err_no_clock:
 108         free_irq(ptp_qoriq->irq, ptp_qoriq);
 109 err_irq:
 110         iounmap(base);
 111 err_ioremap:
 112         kfree(ptp_qoriq);
 113 err_alloc_ptp:
 114         pci_release_mem_regions(pdev);
 115 err_pci_mem_reg:
 116 err_dma:
 117         pci_disable_device(pdev);
 118
 119         return err;
 120 }
 121
 122 static void enetc_ptp_remove(struct pci_dev *pdev)
 123 {
 124         struct ptp_qoriq *ptp_qoriq = pci_get_drvdata(pdev);
 125
 126         enetc_phc_index = -1;
 127         ptp_qoriq_free(ptp_qoriq);
 128         kfree(ptp_qoriq);
 129
 130         pci_release_mem_regions(pdev);
 131         pci_disable_device(pdev);
 132 }
 133
 134 static const struct pci_device_id enetc_ptp_id_table[] = {
 135         { PCI_DEVICE(PCI_VENDOR_ID_FREESCALE, ENETC_DEV_ID_PTP) },
 136         { 0, } /* End of table. */
 137 };
 138 MODULE_DEVICE_TABLE(pci, enetc_ptp_id_table);
 139
 140 static struct pci_driver enetc_ptp_driver = {
 141         .name = KBUILD_MODNAME,
 142         .id_table = enetc_ptp_id_table,
 143         .probe = enetc_ptp_probe,
 144         .remove = enetc_ptp_remove,
 145 };
 146 module_pci_driver(enetc_ptp_driver);
 147
 148 MODULE_DESCRIPTION("ENETC PTP clock driver");
 149 MODULE_LICENSE("Dual BSD/GPL");