1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2015 Alexey Brodkin <abrodkin@synopsys.com>
4 */
5
6 #include <common.h>
7 #include <clk.h>
8 #include <dm.h>
9 #include <log.h>
10 #include <dm/device_compat.h>
11 #include <dm/devres.h>
12 #include <dm/ofnode.h>
13 #include <generic-phy.h>
14 #include <reset.h>
15 #include "ohci.h"
16
17 #if !defined(CONFIG_USB_OHCI_NEW)
18 # error "Generic OHCI driver requires CONFIG_USB_OHCI_NEW"
19 #endif
20
21 struct generic_ohci {
22 ohci_t ohci;
23 struct clk *clocks; /* clock list */
24 struct reset_ctl *resets; /* reset list */
25 struct phy phy;
26 int clock_count; /* number of clock in clock list */
27 int reset_count; /* number of reset in reset list */
28 };
29
ohci_setup_phy(struct udevice * dev,int index)30 static int ohci_setup_phy(struct udevice *dev, int index)
31 {
32 struct generic_ohci *priv = dev_get_priv(dev);
33 int ret;
34
35 ret = generic_phy_get_by_index(dev, index, &priv->phy);
36 if (ret) {
37 if (ret != -ENOENT) {
38 dev_err(dev, "failed to get usb phy\n");
39 return ret;
40 }
41 } else {
42 ret = generic_phy_init(&priv->phy);
43 if (ret) {
44 dev_dbg(dev, "failed to init usb phy\n");
45 return ret;
46 }
47
48 ret = generic_phy_power_on(&priv->phy);
49 if (ret) {
50 dev_dbg(dev, "failed to power on usb phy\n");
51 return generic_phy_exit(&priv->phy);
52 }
53 }
54
55 return 0;
56 }
57
ohci_shutdown_phy(struct udevice * dev)58 static int ohci_shutdown_phy(struct udevice *dev)
59 {
60 struct generic_ohci *priv = dev_get_priv(dev);
61 int ret = 0;
62
63 if (generic_phy_valid(&priv->phy)) {
64 ret = generic_phy_power_off(&priv->phy);
65 if (ret) {
66 dev_dbg(dev, "failed to power off usb phy\n");
67 return ret;
68 }
69
70 ret = generic_phy_exit(&priv->phy);
71 if (ret) {
72 dev_dbg(dev, "failed to power off usb phy\n");
73 return ret;
74 }
75 }
76
77 return 0;
78 }
79
ohci_usb_probe(struct udevice * dev)80 static int ohci_usb_probe(struct udevice *dev)
81 {
82 struct ohci_regs *regs = dev_read_addr_ptr(dev);
83 struct generic_ohci *priv = dev_get_priv(dev);
84 int i, err, ret, clock_nb, reset_nb;
85
86 err = 0;
87 priv->clock_count = 0;
88 clock_nb = dev_count_phandle_with_args(dev, "clocks", "#clock-cells",
89 0);
90 if (clock_nb > 0) {
91 priv->clocks = devm_kcalloc(dev, clock_nb, sizeof(struct clk),
92 GFP_KERNEL);
93 if (!priv->clocks)
94 return -ENOMEM;
95
96 for (i = 0; i < clock_nb; i++) {
97 err = clk_get_by_index(dev, i, &priv->clocks[i]);
98 if (err < 0)
99 break;
100
101 err = clk_enable(&priv->clocks[i]);
102 if (err && err != -ENOSYS) {
103 dev_err(dev, "failed to enable clock %d\n", i);
104 clk_free(&priv->clocks[i]);
105 goto clk_err;
106 }
107 priv->clock_count++;
108 }
109 } else if (clock_nb != -ENOENT) {
110 dev_err(dev, "failed to get clock phandle(%d)\n", clock_nb);
111 return clock_nb;
112 }
113
114 priv->reset_count = 0;
115 reset_nb = dev_count_phandle_with_args(dev, "resets", "#reset-cells",
116 0);
117 if (reset_nb > 0) {
118 priv->resets = devm_kcalloc(dev, reset_nb,
119 sizeof(struct reset_ctl),
120 GFP_KERNEL);
121 if (!priv->resets)
122 return -ENOMEM;
123
124 for (i = 0; i < reset_nb; i++) {
125 err = reset_get_by_index(dev, i, &priv->resets[i]);
126 if (err < 0)
127 break;
128
129 err = reset_deassert(&priv->resets[i]);
130 if (err) {
131 dev_err(dev, "failed to deassert reset %d\n", i);
132 reset_free(&priv->resets[i]);
133 goto reset_err;
134 }
135 priv->reset_count++;
136 }
137 } else if (reset_nb != -ENOENT) {
138 dev_err(dev, "failed to get reset phandle(%d)\n", reset_nb);
139 goto clk_err;
140 }
141
142 err = ohci_setup_phy(dev, 0);
143 if (err)
144 goto reset_err;
145
146 err = ohci_register(dev, regs);
147 if (err)
148 goto phy_err;
149
150 return 0;
151
152 phy_err:
153 ret = ohci_shutdown_phy(dev);
154 if (ret)
155 dev_err(dev, "failed to shutdown usb phy\n");
156
157 reset_err:
158 ret = reset_release_all(priv->resets, priv->reset_count);
159 if (ret)
160 dev_err(dev, "failed to assert all resets\n");
161 clk_err:
162 ret = clk_release_all(priv->clocks, priv->clock_count);
163 if (ret)
164 dev_err(dev, "failed to disable all clocks\n");
165
166 return err;
167 }
168
ohci_usb_remove(struct udevice * dev)169 static int ohci_usb_remove(struct udevice *dev)
170 {
171 struct generic_ohci *priv = dev_get_priv(dev);
172 int ret;
173
174 ret = ohci_deregister(dev);
175 if (ret)
176 return ret;
177
178 ret = ohci_shutdown_phy(dev);
179 if (ret)
180 return ret;
181
182 ret = reset_release_all(priv->resets, priv->reset_count);
183 if (ret)
184 return ret;
185
186 return clk_release_all(priv->clocks, priv->clock_count);
187 }
188
189 static const struct udevice_id ohci_usb_ids[] = {
190 { .compatible = "generic-ohci" },
191 { }
192 };
193
194 U_BOOT_DRIVER(ohci_generic) = {
195 .name = "ohci_generic",
196 .id = UCLASS_USB,
197 .of_match = ohci_usb_ids,
198 .probe = ohci_usb_probe,
199 .remove = ohci_usb_remove,
200 .ops = &ohci_usb_ops,
201 .priv_auto = sizeof(struct generic_ohci),
202 .flags = DM_FLAG_ALLOC_PRIV_DMA,
203 };
204