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 PLL Control register */
20 #define USBH_PLL_REG 0x18
21 #define USBH_PLL_IDDQ_PWRDN BIT(9)
22 #define USBH_PLL_PWRDN_DELAY BIT(10)
23
24 /* USBH Swap Control register */
25 #define USBH_SWAP_REG 0x1c
26 #define USBH_SWAP_OHCI_DATA BIT(0)
27 #define USBH_SWAP_OHCI_ENDIAN BIT(1)
28 #define USBH_SWAP_EHCI_DATA BIT(3)
29 #define USBH_SWAP_EHCI_ENDIAN BIT(4)
30
31 /* USBH Setup register */
32 #define USBH_SETUP_REG 0x28
33 #define USBH_SETUP_IOC BIT(4)
34 #define USBH_SETUP_IPP BIT(5)
35
36 struct bcm6368_usbh_hw {
37 uint32_t setup_clr;
38 uint32_t pll_clr;
39 };
40
41 struct bcm6368_usbh_priv {
42 const struct bcm6368_usbh_hw *hw;
43 void __iomem *regs;
44 };
45
bcm6368_usbh_init(struct phy * phy)46 static int bcm6368_usbh_init(struct phy *phy)
47 {
48 struct bcm6368_usbh_priv *priv = dev_get_priv(phy->dev);
49 const struct bcm6368_usbh_hw *hw = priv->hw;
50
51 /* configure to work in native cpu endian */
52 clrsetbits_be32(priv->regs + USBH_SWAP_REG,
53 USBH_SWAP_EHCI_ENDIAN | USBH_SWAP_OHCI_ENDIAN,
54 USBH_SWAP_EHCI_DATA | USBH_SWAP_OHCI_DATA);
55
56 /* setup config */
57 if (hw->setup_clr)
58 clrbits_be32(priv->regs + USBH_SETUP_REG, hw->setup_clr);
59
60 setbits_be32(priv->regs + USBH_SETUP_REG, USBH_SETUP_IOC);
61
62 /* enable pll control */
63 if (hw->pll_clr)
64 clrbits_be32(priv->regs + USBH_PLL_REG, hw->pll_clr);
65
66 return 0;
67 }
68
69 static struct phy_ops bcm6368_usbh_ops = {
70 .init = bcm6368_usbh_init,
71 };
72
73 static const struct bcm6368_usbh_hw bcm6328_hw = {
74 .pll_clr = USBH_PLL_IDDQ_PWRDN | USBH_PLL_PWRDN_DELAY,
75 .setup_clr = 0,
76 };
77
78 static const struct bcm6368_usbh_hw bcm6362_hw = {
79 .pll_clr = 0,
80 .setup_clr = 0,
81 };
82
83 static const struct bcm6368_usbh_hw bcm6368_hw = {
84 .pll_clr = 0,
85 .setup_clr = 0,
86 };
87
88 static const struct bcm6368_usbh_hw bcm63268_hw = {
89 .pll_clr = USBH_PLL_IDDQ_PWRDN | USBH_PLL_PWRDN_DELAY,
90 .setup_clr = USBH_SETUP_IPP,
91 };
92
93 static const struct udevice_id bcm6368_usbh_ids[] = {
94 {
95 .compatible = "brcm,bcm6328-usbh",
96 .data = (ulong)&bcm6328_hw,
97 }, {
98 .compatible = "brcm,bcm6362-usbh",
99 .data = (ulong)&bcm6362_hw,
100 }, {
101 .compatible = "brcm,bcm6368-usbh",
102 .data = (ulong)&bcm6368_hw,
103 }, {
104 .compatible = "brcm,bcm63268-usbh",
105 .data = (ulong)&bcm63268_hw,
106 }, { /* sentinel */ }
107 };
108
bcm6368_usbh_probe(struct udevice * dev)109 static int bcm6368_usbh_probe(struct udevice *dev)
110 {
111 struct bcm6368_usbh_priv *priv = dev_get_priv(dev);
112 const struct bcm6368_usbh_hw *hw =
113 (const struct bcm6368_usbh_hw *)dev_get_driver_data(dev);
114 #if defined(CONFIG_POWER_DOMAIN)
115 struct power_domain pwr_dom;
116 #endif
117 struct reset_ctl rst_ctl;
118 struct clk clk;
119 int ret;
120
121 priv->regs = dev_remap_addr(dev);
122 if (!priv->regs)
123 return -EINVAL;
124
125 priv->hw = hw;
126
127 /* enable usbh clock */
128 ret = clk_get_by_name(dev, "usbh", &clk);
129 if (ret < 0)
130 return ret;
131
132 ret = clk_enable(&clk);
133 if (ret < 0)
134 return ret;
135
136 ret = clk_free(&clk);
137 if (ret < 0)
138 return ret;
139
140 #if defined(CONFIG_POWER_DOMAIN)
141 /* enable power domain */
142 ret = power_domain_get(dev, &pwr_dom);
143 if (ret < 0)
144 return ret;
145
146 ret = power_domain_on(&pwr_dom);
147 if (ret < 0)
148 return ret;
149
150 ret = power_domain_free(&pwr_dom);
151 if (ret < 0)
152 return ret;
153 #endif
154
155 /* perform reset */
156 ret = reset_get_by_index(dev, 0, &rst_ctl);
157 if (ret < 0)
158 return ret;
159
160 ret = reset_deassert(&rst_ctl);
161 if (ret < 0)
162 return ret;
163
164 ret = reset_free(&rst_ctl);
165 if (ret < 0)
166 return ret;
167
168 /* enable usb_ref clock */
169 ret = clk_get_by_name(dev, "usb_ref", &clk);
170 if (!ret) {
171 ret = clk_enable(&clk);
172 if (ret < 0)
173 return ret;
174
175 ret = clk_free(&clk);
176 if (ret < 0)
177 return ret;
178 }
179
180 mdelay(100);
181
182 return 0;
183 }
184
185 U_BOOT_DRIVER(bcm6368_usbh) = {
186 .name = "bcm6368-usbh",
187 .id = UCLASS_PHY,
188 .of_match = bcm6368_usbh_ids,
189 .ops = &bcm6368_usbh_ops,
190 .priv_auto_alloc_size = sizeof(struct bcm6368_usbh_priv),
191 .probe = bcm6368_usbh_probe,
192 };
193