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[linux.git] / drivers / usb / host / ohci-exynos.c
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * SAMSUNG EXYNOS USB HOST OHCI Controller
4  *
5  * Copyright (C) 2011 Samsung Electronics Co.Ltd
6  * Author: Jingoo Han <[email protected]>
7  */
8
9 #include <linux/clk.h>
10 #include <linux/dma-mapping.h>
11 #include <linux/io.h>
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/of.h>
15 #include <linux/platform_device.h>
16 #include <linux/phy/phy.h>
17 #include <linux/usb.h>
18 #include <linux/usb/hcd.h>
19
20 #include "ohci.h"
21
22 #define DRIVER_DESC "OHCI Exynos driver"
23
24 static struct hc_driver __read_mostly exynos_ohci_hc_driver;
25
26 #define to_exynos_ohci(hcd) (struct exynos_ohci_hcd *)(hcd_to_ohci(hcd)->priv)
27
28 #define PHY_NUMBER 3
29
30 struct exynos_ohci_hcd {
31         struct clk *clk;
32         struct device_node *of_node;
33         struct phy *phy[PHY_NUMBER];
34         bool legacy_phy;
35 };
36
37 static int exynos_ohci_get_phy(struct device *dev,
38                                 struct exynos_ohci_hcd *exynos_ohci)
39 {
40         struct phy *phy;
41         int phy_number, num_phys;
42         int ret;
43
44         /* Get PHYs for the controller */
45         num_phys = of_count_phandle_with_args(dev->of_node, "phys",
46                                               "#phy-cells");
47         for (phy_number = 0; phy_number < num_phys; phy_number++) {
48                 phy = devm_of_phy_get_by_index(dev, dev->of_node, phy_number);
49                 if (IS_ERR(phy))
50                         return PTR_ERR(phy);
51                 exynos_ohci->phy[phy_number] = phy;
52         }
53         if (num_phys > 0)
54                 return 0;
55
56         /* Get PHYs using legacy bindings */
57         for_each_available_child_of_node_scoped(dev->of_node, child) {
58                 ret = of_property_read_u32(child, "reg", &phy_number);
59                 if (ret) {
60                         dev_err(dev, "Failed to parse device tree\n");
61                         return ret;
62                 }
63
64                 if (phy_number >= PHY_NUMBER) {
65                         dev_err(dev, "Invalid number of PHYs\n");
66                         return -EINVAL;
67                 }
68
69                 phy = devm_of_phy_optional_get(dev, child, NULL);
70                 exynos_ohci->phy[phy_number] = phy;
71                 if (IS_ERR(phy))
72                         return PTR_ERR(phy);
73         }
74
75         exynos_ohci->legacy_phy = true;
76         return 0;
77 }
78
79 static int exynos_ohci_phy_enable(struct device *dev)
80 {
81         struct usb_hcd *hcd = dev_get_drvdata(dev);
82         struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
83         int i;
84         int ret = 0;
85
86         for (i = 0; ret == 0 && i < PHY_NUMBER; i++)
87                 ret = phy_power_on(exynos_ohci->phy[i]);
88         if (ret)
89                 for (i--; i >= 0; i--)
90                         phy_power_off(exynos_ohci->phy[i]);
91
92         return ret;
93 }
94
95 static void exynos_ohci_phy_disable(struct device *dev)
96 {
97         struct usb_hcd *hcd = dev_get_drvdata(dev);
98         struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
99         int i;
100
101         for (i = 0; i < PHY_NUMBER; i++)
102                 phy_power_off(exynos_ohci->phy[i]);
103 }
104
105 static int exynos_ohci_probe(struct platform_device *pdev)
106 {
107         struct exynos_ohci_hcd *exynos_ohci;
108         struct usb_hcd *hcd;
109         struct resource *res;
110         int irq;
111         int err;
112
113         /*
114          * Right now device-tree probed devices don't get dma_mask set.
115          * Since shared usb code relies on it, set it here for now.
116          * Once we move to full device tree support this will vanish off.
117          */
118         err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
119         if (err)
120                 return err;
121
122         hcd = usb_create_hcd(&exynos_ohci_hc_driver,
123                                 &pdev->dev, dev_name(&pdev->dev));
124         if (!hcd) {
125                 dev_err(&pdev->dev, "Unable to create HCD\n");
126                 return -ENOMEM;
127         }
128
129         exynos_ohci = to_exynos_ohci(hcd);
130
131         err = exynos_ohci_get_phy(&pdev->dev, exynos_ohci);
132         if (err)
133                 goto fail_io;
134
135         exynos_ohci->clk = devm_clk_get_enabled(&pdev->dev, "usbhost");
136
137         if (IS_ERR(exynos_ohci->clk)) {
138                 dev_err(&pdev->dev, "Failed to get usbhost clock\n");
139                 err = PTR_ERR(exynos_ohci->clk);
140                 goto fail_io;
141         }
142
143         hcd->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
144         if (IS_ERR(hcd->regs)) {
145                 err = PTR_ERR(hcd->regs);
146                 goto fail_io;
147         }
148         hcd->rsrc_start = res->start;
149         hcd->rsrc_len = resource_size(res);
150
151         irq = platform_get_irq(pdev, 0);
152         if (irq < 0) {
153                 err = irq;
154                 goto fail_io;
155         }
156
157         platform_set_drvdata(pdev, hcd);
158
159         err = exynos_ohci_phy_enable(&pdev->dev);
160         if (err) {
161                 dev_err(&pdev->dev, "Failed to enable USB phy\n");
162                 goto fail_io;
163         }
164
165         /*
166          * Workaround: reset of_node pointer to avoid conflict between legacy
167          * Exynos OHCI port subnodes and generic USB device bindings
168          */
169         exynos_ohci->of_node = pdev->dev.of_node;
170         if (exynos_ohci->legacy_phy)
171                 pdev->dev.of_node = NULL;
172
173         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
174         if (err) {
175                 dev_err(&pdev->dev, "Failed to add USB HCD\n");
176                 goto fail_add_hcd;
177         }
178         device_wakeup_enable(hcd->self.controller);
179         return 0;
180
181 fail_add_hcd:
182         exynos_ohci_phy_disable(&pdev->dev);
183         pdev->dev.of_node = exynos_ohci->of_node;
184 fail_io:
185         usb_put_hcd(hcd);
186         return err;
187 }
188
189 static void exynos_ohci_remove(struct platform_device *pdev)
190 {
191         struct usb_hcd *hcd = platform_get_drvdata(pdev);
192         struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
193
194         pdev->dev.of_node = exynos_ohci->of_node;
195
196         usb_remove_hcd(hcd);
197
198         exynos_ohci_phy_disable(&pdev->dev);
199
200         usb_put_hcd(hcd);
201 }
202
203 static void exynos_ohci_shutdown(struct platform_device *pdev)
204 {
205         struct usb_hcd *hcd = platform_get_drvdata(pdev);
206
207         if (hcd->driver->shutdown)
208                 hcd->driver->shutdown(hcd);
209 }
210
211 static int exynos_ohci_suspend(struct device *dev)
212 {
213         struct usb_hcd *hcd = dev_get_drvdata(dev);
214         struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
215         bool do_wakeup = device_may_wakeup(dev);
216         int rc = ohci_suspend(hcd, do_wakeup);
217
218         if (rc)
219                 return rc;
220
221         exynos_ohci_phy_disable(dev);
222
223         clk_disable_unprepare(exynos_ohci->clk);
224
225         return 0;
226 }
227
228 static int exynos_ohci_resume(struct device *dev)
229 {
230         struct usb_hcd *hcd                     = dev_get_drvdata(dev);
231         struct exynos_ohci_hcd *exynos_ohci     = to_exynos_ohci(hcd);
232         int ret;
233
234         clk_prepare_enable(exynos_ohci->clk);
235
236         ret = exynos_ohci_phy_enable(dev);
237         if (ret) {
238                 dev_err(dev, "Failed to enable USB phy\n");
239                 clk_disable_unprepare(exynos_ohci->clk);
240                 return ret;
241         }
242
243         ohci_resume(hcd, false);
244
245         return 0;
246 }
247
248 static const struct ohci_driver_overrides exynos_overrides __initconst = {
249         .extra_priv_size =      sizeof(struct exynos_ohci_hcd),
250 };
251
252 static DEFINE_SIMPLE_DEV_PM_OPS(exynos_ohci_pm_ops,
253                                 exynos_ohci_suspend, exynos_ohci_resume);
254
255 #ifdef CONFIG_OF
256 static const struct of_device_id exynos_ohci_match[] = {
257         { .compatible = "samsung,exynos4210-ohci" },
258         {},
259 };
260 MODULE_DEVICE_TABLE(of, exynos_ohci_match);
261 #endif
262
263 static struct platform_driver exynos_ohci_driver = {
264         .probe          = exynos_ohci_probe,
265         .remove         = exynos_ohci_remove,
266         .shutdown       = exynos_ohci_shutdown,
267         .driver = {
268                 .name   = "exynos-ohci",
269                 .pm     = pm_ptr(&exynos_ohci_pm_ops),
270                 .of_match_table = of_match_ptr(exynos_ohci_match),
271         }
272 };
273 static int __init ohci_exynos_init(void)
274 {
275         if (usb_disabled())
276                 return -ENODEV;
277
278         ohci_init_driver(&exynos_ohci_hc_driver, &exynos_overrides);
279         return platform_driver_register(&exynos_ohci_driver);
280 }
281 module_init(ohci_exynos_init);
282
283 static void __exit ohci_exynos_cleanup(void)
284 {
285         platform_driver_unregister(&exynos_ohci_driver);
286 }
287 module_exit(ohci_exynos_cleanup);
288
289 MODULE_ALIAS("platform:exynos-ohci");
290 MODULE_AUTHOR("Jingoo Han <[email protected]>");
291 MODULE_DESCRIPTION("OHCI support for Samsung S5P/Exynos SoC Series");
292 MODULE_LICENSE("GPL v2");
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