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4484f730 PK |
1 | /* |
2 | * Copyright (C) 2016 Broadcom | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License as | |
6 | * published by the Free Software Foundation version 2. | |
7 | * | |
8 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any | |
9 | * kind, whether express or implied; without even the implied warranty | |
10 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | */ | |
13 | ||
14 | #include <linux/device.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/of_mdio.h> | |
17 | #include <linux/mdio.h> | |
18 | #include <linux/phy.h> | |
19 | #include <linux/phy/phy.h> | |
20 | ||
21 | struct ns2_pci_phy { | |
22 | struct mdio_device *mdiodev; | |
23 | struct phy *phy; | |
24 | }; | |
25 | ||
26 | #define BLK_ADDR_REG_OFFSET 0x1f | |
27 | #define PLL_AFE1_100MHZ_BLK 0x2100 | |
28 | #define PLL_CLK_AMP_OFFSET 0x03 | |
29 | #define PLL_CLK_AMP_2P05V 0x2b18 | |
30 | ||
31 | static int ns2_pci_phy_init(struct phy *p) | |
32 | { | |
33 | struct ns2_pci_phy *phy = phy_get_drvdata(p); | |
34 | int rc; | |
35 | ||
36 | /* select the AFE 100MHz block page */ | |
37 | rc = mdiobus_write(phy->mdiodev->bus, phy->mdiodev->addr, | |
38 | BLK_ADDR_REG_OFFSET, PLL_AFE1_100MHZ_BLK); | |
39 | if (rc) | |
40 | goto err; | |
41 | ||
42 | /* set the 100 MHz reference clock amplitude to 2.05 v */ | |
43 | rc = mdiobus_write(phy->mdiodev->bus, phy->mdiodev->addr, | |
44 | PLL_CLK_AMP_OFFSET, PLL_CLK_AMP_2P05V); | |
45 | if (rc) | |
46 | goto err; | |
47 | ||
48 | return 0; | |
49 | ||
50 | err: | |
51 | dev_err(&phy->mdiodev->dev, "Error %d writing to phy\n", rc); | |
52 | return rc; | |
53 | } | |
54 | ||
55 | static struct phy_ops ns2_pci_phy_ops = { | |
56 | .init = ns2_pci_phy_init, | |
57 | }; | |
58 | ||
59 | static int ns2_pci_phy_probe(struct mdio_device *mdiodev) | |
60 | { | |
61 | struct device *dev = &mdiodev->dev; | |
62 | struct phy_provider *provider; | |
63 | struct ns2_pci_phy *p; | |
64 | struct phy *phy; | |
65 | ||
66 | phy = devm_phy_create(dev, dev->of_node, &ns2_pci_phy_ops); | |
67 | if (IS_ERR(phy)) { | |
68 | dev_err(dev, "failed to create Phy\n"); | |
69 | return PTR_ERR(phy); | |
70 | } | |
71 | ||
72 | p = devm_kmalloc(dev, sizeof(struct ns2_pci_phy), | |
73 | GFP_KERNEL); | |
74 | if (!p) | |
75 | return -ENOMEM; | |
76 | ||
77 | p->mdiodev = mdiodev; | |
78 | dev_set_drvdata(dev, p); | |
79 | ||
80 | p->phy = phy; | |
81 | phy_set_drvdata(phy, p); | |
82 | ||
83 | provider = devm_of_phy_provider_register(&phy->dev, | |
84 | of_phy_simple_xlate); | |
85 | if (IS_ERR(provider)) { | |
86 | dev_err(dev, "failed to register Phy provider\n"); | |
87 | return PTR_ERR(provider); | |
88 | } | |
89 | ||
90 | dev_info(dev, "%s PHY registered\n", dev_name(dev)); | |
91 | ||
92 | return 0; | |
93 | } | |
94 | ||
95 | static const struct of_device_id ns2_pci_phy_of_match[] = { | |
96 | { .compatible = "brcm,ns2-pcie-phy", }, | |
97 | { /* sentinel */ }, | |
98 | }; | |
99 | MODULE_DEVICE_TABLE(of, ns2_pci_phy_of_match); | |
100 | ||
101 | static struct mdio_driver ns2_pci_phy_driver = { | |
102 | .mdiodrv = { | |
103 | .driver = { | |
104 | .name = "phy-bcm-ns2-pci", | |
105 | .of_match_table = ns2_pci_phy_of_match, | |
106 | }, | |
107 | }, | |
108 | .probe = ns2_pci_phy_probe, | |
109 | }; | |
110 | mdio_module_driver(ns2_pci_phy_driver); | |
111 | ||
112 | MODULE_AUTHOR("Broadcom"); | |
113 | MODULE_DESCRIPTION("Broadcom Northstar2 PCI Phy driver"); | |
114 | MODULE_LICENSE("GPL v2"); | |
115 | MODULE_ALIAS("platform:phy-bcm-ns2-pci"); |