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
enetc_ptp_probe(struct pci_dev * pdev,const struct pci_device_id * ent)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 return dev_err_probe(&pdev->dev, err, "device enable failed\n");
44
45 /* set up for high or low dma */
46 err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
47 if (err) {
48 err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
49 if (err) {
50 dev_err(&pdev->dev,
51 "DMA configuration failed: 0x%x\n", err);
52 goto err_dma;
53 }
54 }
55
56 err = pci_request_mem_regions(pdev, KBUILD_MODNAME);
57 if (err) {
58 dev_err(&pdev->dev, "pci_request_regions failed err=%d\n", err);
59 goto err_pci_mem_reg;
60 }
61
62 pci_set_master(pdev);
63
64 ptp_qoriq = kzalloc(sizeof(*ptp_qoriq), GFP_KERNEL);
65 if (!ptp_qoriq) {
66 err = -ENOMEM;
67 goto err_alloc_ptp;
68 }
69
70 len = pci_resource_len(pdev, ENETC_BAR_REGS);
71
72 base = ioremap(pci_resource_start(pdev, ENETC_BAR_REGS), len);
73 if (!base) {
74 err = -ENXIO;
75 dev_err(&pdev->dev, "ioremap() failed\n");
76 goto err_ioremap;
77 }
78
79 /* Allocate 1 interrupt */
80 n = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSIX);
81 if (n != 1) {
82 err = -EPERM;
83 goto err_irq_vectors;
84 }
85
86 ptp_qoriq->irq = pci_irq_vector(pdev, 0);
87
88 err = request_irq(ptp_qoriq->irq, ptp_qoriq_isr, 0, DRIVER, ptp_qoriq);
89 if (err) {
90 dev_err(&pdev->dev, "request_irq() failed!\n");
91 goto err_irq;
92 }
93
94 ptp_qoriq->dev = &pdev->dev;
95
96 err = ptp_qoriq_init(ptp_qoriq, base, &enetc_ptp_caps);
97 if (err)
98 goto err_no_clock;
99
100 enetc_phc_index = ptp_qoriq->phc_index;
101 pci_set_drvdata(pdev, ptp_qoriq);
102
103 return 0;
104
105 err_no_clock:
106 free_irq(ptp_qoriq->irq, ptp_qoriq);
107 err_irq:
108 pci_free_irq_vectors(pdev);
109 err_irq_vectors:
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
enetc_ptp_remove(struct pci_dev * pdev)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 pci_free_irq_vectors(pdev);
129 kfree(ptp_qoriq);
130
131 pci_release_mem_regions(pdev);
132 pci_disable_device(pdev);
133 }
134
135 static const struct pci_device_id enetc_ptp_id_table[] = {
136 { PCI_DEVICE(PCI_VENDOR_ID_FREESCALE, ENETC_DEV_ID_PTP) },
137 { 0, } /* End of table. */
138 };
139 MODULE_DEVICE_TABLE(pci, enetc_ptp_id_table);
140
141 static struct pci_driver enetc_ptp_driver = {
142 .name = KBUILD_MODNAME,
143 .id_table = enetc_ptp_id_table,
144 .probe = enetc_ptp_probe,
145 .remove = enetc_ptp_remove,
146 };
147 module_pci_driver(enetc_ptp_driver);
148
149 MODULE_DESCRIPTION("ENETC PTP clock driver");
150 MODULE_LICENSE("Dual BSD/GPL");
151