1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (C) 2018 Álvaro Fernández Rojas <noltari@gmail.com>
4  *
5  * Derived from linux/arch/mips/bcm63xx/usb-common.c:
6  *	Copyright 2008 Maxime Bizon <mbizon@freebox.fr>
7  *	Copyright 2013 Florian Fainelli <florian@openwrt.org>
8  */
9 
10 #include <common.h>
11 #include <clk.h>
12 #include <dm.h>
13 #include <generic-phy.h>
14 #include <power-domain.h>
15 #include <reset.h>
16 #include <asm/io.h>
17 #include <dm/device.h>
18 
19 /* USBH Setup register */
20 #define USBH_SETUP_REG		0x00
21 #define USBH_SETUP_IOC		BIT(4)
22 
23 /* USBH PLL Control register */
24 #define USBH_PLL_REG		0x04
25 #define USBH_PLL_SUSP_EN	BIT(27)
26 #define USBH_PLL_IDDQ_PWRDN	BIT(31)
27 
28 /* USBH Swap Control register */
29 #define USBH_SWAP_REG		0x0c
30 #define USBH_SWAP_OHCI_DATA	BIT(0)
31 #define USBH_SWAP_OHCI_ENDIAN	BIT(1)
32 #define USBH_SWAP_EHCI_DATA	BIT(3)
33 #define USBH_SWAP_EHCI_ENDIAN	BIT(4)
34 
35 /* USBH Sim Control register */
36 #define USBH_SIM_REG		0x20
37 #define USBH_SIM_LADDR		BIT(5)
38 
39 struct bcm6318_usbh_priv {
40 	void __iomem *regs;
41 };
42 
bcm6318_usbh_init(struct phy * phy)43 static int bcm6318_usbh_init(struct phy *phy)
44 {
45 	struct bcm6318_usbh_priv *priv = dev_get_priv(phy->dev);
46 
47 	/* enable pll control susp */
48 	setbits_be32(priv->regs + USBH_PLL_REG, USBH_PLL_SUSP_EN);
49 
50 	/* configure to work in native cpu endian */
51 	clrsetbits_be32(priv->regs + USBH_SWAP_REG,
52 			USBH_SWAP_EHCI_ENDIAN | USBH_SWAP_OHCI_ENDIAN,
53 			USBH_SWAP_EHCI_DATA | USBH_SWAP_OHCI_DATA);
54 
55 	/* setup config */
56 	setbits_be32(priv->regs + USBH_SETUP_REG, USBH_SETUP_IOC);
57 
58 	/* disable pll control pwrdn */
59 	clrbits_be32(priv->regs + USBH_PLL_REG, USBH_PLL_IDDQ_PWRDN);
60 
61 	/* sim control config */
62 	setbits_be32(priv->regs + USBH_SIM_REG, USBH_SIM_LADDR);
63 
64 	return 0;
65 }
66 
67 static struct phy_ops bcm6318_usbh_ops = {
68 	.init = bcm6318_usbh_init,
69 };
70 
71 static const struct udevice_id bcm6318_usbh_ids[] = {
72 	{ .compatible = "brcm,bcm6318-usbh" },
73 	{ /* sentinel */ }
74 };
75 
bcm6318_usbh_probe(struct udevice * dev)76 static int bcm6318_usbh_probe(struct udevice *dev)
77 {
78 	struct bcm6318_usbh_priv *priv = dev_get_priv(dev);
79 	struct power_domain pwr_dom;
80 	struct reset_ctl rst_ctl;
81 	struct clk clk;
82 	int ret;
83 
84 	priv->regs = dev_remap_addr(dev);
85 	if (!priv->regs)
86 		return -EINVAL;
87 
88 	/* enable usbh clock */
89 	ret = clk_get_by_name(dev, "usbh", &clk);
90 	if (ret < 0)
91 		return ret;
92 
93 	ret = clk_enable(&clk);
94 	if (ret < 0)
95 		return ret;
96 
97 	ret = clk_free(&clk);
98 	if (ret < 0)
99 		return ret;
100 
101 	/* enable power domain */
102 	ret = power_domain_get(dev, &pwr_dom);
103 	if (ret < 0)
104 		return ret;
105 
106 	ret = power_domain_on(&pwr_dom);
107 	if (ret < 0)
108 		return ret;
109 
110 	ret = power_domain_free(&pwr_dom);
111 	if (ret < 0)
112 		return ret;
113 
114 	/* perform reset */
115 	ret = reset_get_by_index(dev, 0, &rst_ctl);
116 	if (ret < 0)
117 		return ret;
118 
119 	ret = reset_deassert(&rst_ctl);
120 	if (ret < 0)
121 		return ret;
122 
123 	ret = reset_free(&rst_ctl);
124 	if (ret < 0)
125 		return ret;
126 
127 	mdelay(100);
128 
129 	return 0;
130 }
131 
132 U_BOOT_DRIVER(bcm6318_usbh) = {
133 	.name = "bcm6318-usbh",
134 	.id = UCLASS_PHY,
135 	.of_match = bcm6318_usbh_ids,
136 	.ops = &bcm6318_usbh_ops,
137 	.priv_auto_alloc_size = sizeof(struct bcm6318_usbh_priv),
138 	.probe = bcm6318_usbh_probe,
139 };
140