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 <log.h>
15 #include <malloc.h>
16 #include <power-domain.h>
17 #include <reset.h>
18 #include <asm/io.h>
19 #include <dm/device.h>
20 #include <linux/bitops.h>
21 #include <linux/delay.h>
22
23 /* USBH Setup register */
24 #define USBH_SETUP_REG 0x00
25 #define USBH_SETUP_IOC BIT(4)
26
27 /* USBH PLL Control register */
28 #define USBH_PLL_REG 0x04
29 #define USBH_PLL_SUSP_EN BIT(27)
30 #define USBH_PLL_IDDQ_PWRDN BIT(31)
31
32 /* USBH Swap Control register */
33 #define USBH_SWAP_REG 0x0c
34 #define USBH_SWAP_OHCI_DATA BIT(0)
35 #define USBH_SWAP_OHCI_ENDIAN BIT(1)
36 #define USBH_SWAP_EHCI_DATA BIT(3)
37 #define USBH_SWAP_EHCI_ENDIAN BIT(4)
38
39 /* USBH Sim Control register */
40 #define USBH_SIM_REG 0x20
41 #define USBH_SIM_LADDR BIT(5)
42
43 struct bcm6318_usbh_priv {
44 void __iomem *regs;
45 };
46
bcm6318_usbh_init(struct phy * phy)47 static int bcm6318_usbh_init(struct phy *phy)
48 {
49 struct bcm6318_usbh_priv *priv = dev_get_priv(phy->dev);
50
51 /* enable pll control susp */
52 setbits_be32(priv->regs + USBH_PLL_REG, USBH_PLL_SUSP_EN);
53
54 /* configure to work in native cpu endian */
55 clrsetbits_be32(priv->regs + USBH_SWAP_REG,
56 USBH_SWAP_EHCI_ENDIAN | USBH_SWAP_OHCI_ENDIAN,
57 USBH_SWAP_EHCI_DATA | USBH_SWAP_OHCI_DATA);
58
59 /* setup config */
60 setbits_be32(priv->regs + USBH_SETUP_REG, USBH_SETUP_IOC);
61
62 /* disable pll control pwrdn */
63 clrbits_be32(priv->regs + USBH_PLL_REG, USBH_PLL_IDDQ_PWRDN);
64
65 /* sim control config */
66 setbits_be32(priv->regs + USBH_SIM_REG, USBH_SIM_LADDR);
67
68 return 0;
69 }
70
71 static struct phy_ops bcm6318_usbh_ops = {
72 .init = bcm6318_usbh_init,
73 };
74
75 static const struct udevice_id bcm6318_usbh_ids[] = {
76 { .compatible = "brcm,bcm6318-usbh" },
77 { /* sentinel */ }
78 };
79
bcm6318_usbh_probe(struct udevice * dev)80 static int bcm6318_usbh_probe(struct udevice *dev)
81 {
82 struct bcm6318_usbh_priv *priv = dev_get_priv(dev);
83 struct power_domain pwr_dom;
84 struct reset_ctl rst_ctl;
85 struct clk clk;
86 int ret;
87
88 priv->regs = dev_remap_addr(dev);
89 if (!priv->regs)
90 return -EINVAL;
91
92 /* enable usbh clock */
93 ret = clk_get_by_name(dev, "usbh", &clk);
94 if (ret < 0)
95 return ret;
96
97 ret = clk_enable(&clk);
98 if (ret < 0)
99 return ret;
100
101 ret = clk_free(&clk);
102 if (ret < 0)
103 return ret;
104
105 /* enable power domain */
106 ret = power_domain_get(dev, &pwr_dom);
107 if (ret < 0)
108 return ret;
109
110 ret = power_domain_on(&pwr_dom);
111 if (ret < 0)
112 return ret;
113
114 ret = power_domain_free(&pwr_dom);
115 if (ret < 0)
116 return ret;
117
118 /* perform reset */
119 ret = reset_get_by_index(dev, 0, &rst_ctl);
120 if (ret < 0)
121 return ret;
122
123 ret = reset_deassert(&rst_ctl);
124 if (ret < 0)
125 return ret;
126
127 ret = reset_free(&rst_ctl);
128 if (ret < 0)
129 return ret;
130
131 mdelay(100);
132
133 return 0;
134 }
135
136 U_BOOT_DRIVER(bcm6318_usbh) = {
137 .name = "bcm6318-usbh",
138 .id = UCLASS_PHY,
139 .of_match = bcm6318_usbh_ids,
140 .ops = &bcm6318_usbh_ops,
141 .priv_auto = sizeof(struct bcm6318_usbh_priv),
142 .probe = bcm6318_usbh_probe,
143 };
144