1 /*
2 * Copyright (C) 2015 Alexey Brodkin <abrodkin@synopsys.com>
3 *
4 * SPDX-License-Identifier: GPL-2.0+
5 */
6
7 #include <asm/io.h>
8 #include <common.h>
9 #include <clk.h>
10 #include <dm.h>
11 #include <dm/ofnode.h>
12 #include <generic-phy.h>
13 #include <reset.h>
14 #include "ohci.h"
15
16 #if !defined(CONFIG_USB_OHCI_NEW)
17 # error "Generic OHCI driver requires CONFIG_USB_OHCI_NEW"
18 #endif
19
20 struct generic_ohci {
21 ohci_t ohci;
22 struct clk *clocks; /* clock list */
23 struct reset_ctl *resets; /* reset list */
24 struct phy phy;
25 int clock_count; /* number of clock in clock list */
26 int reset_count; /* number of reset in reset list */
27 };
28
ohci_setup_phy(struct udevice * dev,int index)29 static int ohci_setup_phy(struct udevice *dev, int index)
30 {
31 struct generic_ohci *priv = dev_get_priv(dev);
32 int ret;
33
34 ret = generic_phy_get_by_index(dev, index, &priv->phy);
35 if (ret) {
36 if (ret != -ENOENT) {
37 dev_err(dev, "failed to get usb phy\n");
38 return ret;
39 }
40 } else {
41 ret = generic_phy_init(&priv->phy);
42 if (ret) {
43 dev_err(dev, "failed to init usb phy\n");
44 return ret;
45 }
46
47 ret = generic_phy_power_on(&priv->phy);
48 if (ret) {
49 dev_err(dev, "failed to power on usb phy\n");
50 return generic_phy_exit(&priv->phy);
51 }
52 }
53
54 return 0;
55 }
56
ohci_shutdown_phy(struct udevice * dev)57 static int ohci_shutdown_phy(struct udevice *dev)
58 {
59 struct generic_ohci *priv = dev_get_priv(dev);
60 int ret = 0;
61
62 if (generic_phy_valid(&priv->phy)) {
63 ret = generic_phy_power_off(&priv->phy);
64 if (ret) {
65 dev_err(dev, "failed to power off usb phy\n");
66 return ret;
67 }
68
69 ret = generic_phy_exit(&priv->phy);
70 if (ret) {
71 dev_err(dev, "failed to power off usb phy\n");
72 return ret;
73 }
74 }
75
76 return 0;
77 }
78
ohci_usb_probe(struct udevice * dev)79 static int ohci_usb_probe(struct udevice *dev)
80 {
81 struct ohci_regs *regs;
82 struct generic_ohci *priv = dev_get_priv(dev);
83 int i, err, ret, clock_nb, reset_nb;
84
85 err = 0;
86 priv->clock_count = 0;
87 clock_nb = dev_count_phandle_with_args(dev, "clocks", "#clock-cells");
88 if (clock_nb > 0) {
89 priv->clocks = devm_kcalloc(dev, clock_nb, sizeof(struct clk),
90 GFP_KERNEL);
91 if (!priv->clocks)
92 return -ENOMEM;
93
94 for (i = 0; i < clock_nb; i++) {
95 err = clk_get_by_index(dev, i, &priv->clocks[i]);
96 if (err < 0)
97 break;
98
99 err = clk_enable(&priv->clocks[i]);
100 if (err && err != -ENOSYS) {
101 dev_err(dev, "failed to enable clock %d\n", i);
102 clk_free(&priv->clocks[i]);
103 goto clk_err;
104 }
105 priv->clock_count++;
106 }
107 } else if (clock_nb != -ENOENT) {
108 dev_err(dev, "failed to get clock phandle(%d)\n", clock_nb);
109 return clock_nb;
110 }
111
112 priv->reset_count = 0;
113 reset_nb = dev_count_phandle_with_args(dev, "resets", "#reset-cells");
114 if (reset_nb > 0) {
115 priv->resets = devm_kcalloc(dev, reset_nb,
116 sizeof(struct reset_ctl),
117 GFP_KERNEL);
118 if (!priv->resets)
119 return -ENOMEM;
120
121 for (i = 0; i < reset_nb; i++) {
122 err = reset_get_by_index(dev, i, &priv->resets[i]);
123 if (err < 0)
124 break;
125
126 err = reset_deassert(&priv->resets[i]);
127 if (err) {
128 dev_err(dev, "failed to deassert reset %d\n", i);
129 reset_free(&priv->resets[i]);
130 goto reset_err;
131 }
132 priv->reset_count++;
133 }
134 } else if (reset_nb != -ENOENT) {
135 dev_err(dev, "failed to get reset phandle(%d)\n", reset_nb);
136 goto clk_err;
137 }
138
139 err = ohci_setup_phy(dev, 0);
140 if (err)
141 goto reset_err;
142
143 regs = map_physmem(dev_read_addr(dev), 0x100, MAP_NOCACHE);
144 err = ohci_register(dev, regs);
145 if (err)
146 goto phy_err;
147
148 return 0;
149
150 phy_err:
151 ret = ohci_shutdown_phy(dev);
152 if (ret)
153 dev_err(dev, "failed to shutdown usb phy\n");
154
155 reset_err:
156 ret = reset_release_all(priv->resets, priv->reset_count);
157 if (ret)
158 dev_err(dev, "failed to assert all resets\n");
159 clk_err:
160 ret = clk_release_all(priv->clocks, priv->clock_count);
161 if (ret)
162 dev_err(dev, "failed to disable all clocks\n");
163
164 return err;
165 }
166
ohci_usb_remove(struct udevice * dev)167 static int ohci_usb_remove(struct udevice *dev)
168 {
169 struct generic_ohci *priv = dev_get_priv(dev);
170 int ret;
171
172 ret = ohci_deregister(dev);
173 if (ret)
174 return ret;
175
176 ret = ohci_shutdown_phy(dev);
177 if (ret)
178 return ret;
179
180 ret = reset_release_all(priv->resets, priv->reset_count);
181 if (ret)
182 return ret;
183
184 return clk_release_all(priv->clocks, priv->clock_count);
185 }
186
187 static const struct udevice_id ohci_usb_ids[] = {
188 { .compatible = "generic-ohci" },
189 { }
190 };
191
192 U_BOOT_DRIVER(ohci_generic) = {
193 .name = "ohci_generic",
194 .id = UCLASS_USB,
195 .of_match = ohci_usb_ids,
196 .probe = ohci_usb_probe,
197 .remove = ohci_usb_remove,
198 .ops = &ohci_usb_ops,
199 .priv_auto_alloc_size = sizeof(struct generic_ohci),
200 .flags = DM_FLAG_ALLOC_PRIV_DMA,
201 };
202