1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * phy-bcm-kona-usb2.c - Broadcom Kona USB2 Phy Driver |
4 | * |
5 | * Copyright (C) 2013 Linaro Limited |
6 | * Matt Porter <mporter@linaro.org> |
7 | */ |
8 | |
9 | #include <linux/clk.h> |
10 | #include <linux/delay.h> |
11 | #include <linux/err.h> |
12 | #include <linux/io.h> |
13 | #include <linux/module.h> |
14 | #include <linux/of.h> |
15 | #include <linux/phy/phy.h> |
16 | #include <linux/platform_device.h> |
17 | |
18 | #define OTGCTL (0) |
19 | #define OTGCTL_OTGSTAT2 BIT(31) |
20 | #define OTGCTL_OTGSTAT1 BIT(30) |
21 | #define OTGCTL_PRST_N_SW BIT(11) |
22 | #define OTGCTL_HRESET_N BIT(10) |
23 | #define OTGCTL_UTMI_LINE_STATE1 BIT(9) |
24 | #define OTGCTL_UTMI_LINE_STATE0 BIT(8) |
25 | |
26 | #define P1CTL (8) |
27 | #define P1CTL_SOFT_RESET BIT(1) |
28 | #define P1CTL_NON_DRIVING BIT(0) |
29 | |
30 | struct bcm_kona_usb { |
31 | void __iomem *regs; |
32 | }; |
33 | |
34 | static void bcm_kona_usb_phy_power(struct bcm_kona_usb *phy, int on) |
35 | { |
36 | u32 val; |
37 | |
38 | val = readl(addr: phy->regs + OTGCTL); |
39 | if (on) { |
40 | /* Configure and power PHY */ |
41 | val &= ~(OTGCTL_OTGSTAT2 | OTGCTL_OTGSTAT1 | |
42 | OTGCTL_UTMI_LINE_STATE1 | OTGCTL_UTMI_LINE_STATE0); |
43 | val |= OTGCTL_PRST_N_SW | OTGCTL_HRESET_N; |
44 | } else { |
45 | val &= ~(OTGCTL_PRST_N_SW | OTGCTL_HRESET_N); |
46 | } |
47 | writel(val, addr: phy->regs + OTGCTL); |
48 | } |
49 | |
50 | static int bcm_kona_usb_phy_init(struct phy *gphy) |
51 | { |
52 | struct bcm_kona_usb *phy = phy_get_drvdata(phy: gphy); |
53 | u32 val; |
54 | |
55 | /* Soft reset PHY */ |
56 | val = readl(addr: phy->regs + P1CTL); |
57 | val &= ~P1CTL_NON_DRIVING; |
58 | val |= P1CTL_SOFT_RESET; |
59 | writel(val, addr: phy->regs + P1CTL); |
60 | writel(val: val & ~P1CTL_SOFT_RESET, addr: phy->regs + P1CTL); |
61 | /* Reset needs to be asserted for 2ms */ |
62 | mdelay(2); |
63 | writel(val: val | P1CTL_SOFT_RESET, addr: phy->regs + P1CTL); |
64 | |
65 | return 0; |
66 | } |
67 | |
68 | static int bcm_kona_usb_phy_power_on(struct phy *gphy) |
69 | { |
70 | struct bcm_kona_usb *phy = phy_get_drvdata(phy: gphy); |
71 | |
72 | bcm_kona_usb_phy_power(phy, on: 1); |
73 | |
74 | return 0; |
75 | } |
76 | |
77 | static int bcm_kona_usb_phy_power_off(struct phy *gphy) |
78 | { |
79 | struct bcm_kona_usb *phy = phy_get_drvdata(phy: gphy); |
80 | |
81 | bcm_kona_usb_phy_power(phy, on: 0); |
82 | |
83 | return 0; |
84 | } |
85 | |
86 | static const struct phy_ops ops = { |
87 | .init = bcm_kona_usb_phy_init, |
88 | .power_on = bcm_kona_usb_phy_power_on, |
89 | .power_off = bcm_kona_usb_phy_power_off, |
90 | .owner = THIS_MODULE, |
91 | }; |
92 | |
93 | static int bcm_kona_usb2_probe(struct platform_device *pdev) |
94 | { |
95 | struct device *dev = &pdev->dev; |
96 | struct bcm_kona_usb *phy; |
97 | struct phy *gphy; |
98 | struct phy_provider *phy_provider; |
99 | |
100 | phy = devm_kzalloc(dev, size: sizeof(*phy), GFP_KERNEL); |
101 | if (!phy) |
102 | return -ENOMEM; |
103 | |
104 | phy->regs = devm_platform_ioremap_resource(pdev, index: 0); |
105 | if (IS_ERR(ptr: phy->regs)) |
106 | return PTR_ERR(ptr: phy->regs); |
107 | |
108 | platform_set_drvdata(pdev, data: phy); |
109 | |
110 | gphy = devm_phy_create(dev, NULL, ops: &ops); |
111 | if (IS_ERR(ptr: gphy)) |
112 | return PTR_ERR(ptr: gphy); |
113 | |
114 | /* The Kona PHY supports an 8-bit wide UTMI interface */ |
115 | phy_set_bus_width(phy: gphy, bus_width: 8); |
116 | |
117 | phy_set_drvdata(phy: gphy, data: phy); |
118 | |
119 | phy_provider = devm_of_phy_provider_register(dev, |
120 | of_phy_simple_xlate); |
121 | |
122 | return PTR_ERR_OR_ZERO(ptr: phy_provider); |
123 | } |
124 | |
125 | static const struct of_device_id bcm_kona_usb2_dt_ids[] = { |
126 | { .compatible = "brcm,kona-usb2-phy" }, |
127 | { /* sentinel */ } |
128 | }; |
129 | |
130 | MODULE_DEVICE_TABLE(of, bcm_kona_usb2_dt_ids); |
131 | |
132 | static struct platform_driver bcm_kona_usb2_driver = { |
133 | .probe = bcm_kona_usb2_probe, |
134 | .driver = { |
135 | .name = "bcm-kona-usb2" , |
136 | .of_match_table = bcm_kona_usb2_dt_ids, |
137 | }, |
138 | }; |
139 | |
140 | module_platform_driver(bcm_kona_usb2_driver); |
141 | |
142 | MODULE_ALIAS("platform:bcm-kona-usb2" ); |
143 | MODULE_AUTHOR("Matt Porter <mporter@linaro.org>" ); |
144 | MODULE_DESCRIPTION("BCM Kona USB 2.0 PHY driver" ); |
145 | MODULE_LICENSE("GPL v2" ); |
146 | |