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1// SPDX-License-Identifier: GPL-2.0
2/*
3* OHCI HCD (Host Controller Driver) for USB.
4*
5* Copyright (C) 2010 ST Microelectronics.
6* Deepak Sikri<deepak.sikri@st.com>
7*
8* Based on various ohci-*.c drivers
9*/
10
11#include <linux/clk.h>
12#include <linux/dma-mapping.h>
13#include <linux/io.h>
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/of.h>
17#include <linux/platform_device.h>
18#include <linux/signal.h>
19#include <linux/usb.h>
20#include <linux/usb/hcd.h>
21
22#include "ohci.h"
23
24#define DRIVER_DESC "OHCI SPEAr driver"
25
26struct spear_ohci {
27 struct clk *clk;
28};
29
30#define to_spear_ohci(hcd) (struct spear_ohci *)(hcd_to_ohci(hcd)->priv)
31
32static struct hc_driver __read_mostly ohci_spear_hc_driver;
33
34static int spear_ohci_hcd_drv_probe(struct platform_device *pdev)
35{
36 const struct hc_driver *driver = &ohci_spear_hc_driver;
37 struct usb_hcd *hcd = NULL;
38 struct clk *usbh_clk;
39 struct spear_ohci *sohci_p;
40 struct resource *res;
41 int retval, irq;
42
43 irq = platform_get_irq(pdev, 0);
44 if (irq < 0) {
45 retval = irq;
46 goto fail;
47 }
48
49 /*
50 * Right now device-tree probed devices don't get dma_mask set.
51 * Since shared usb code relies on it, set it here for now.
52 * Once we have dma capability bindings this can go away.
53 */
54 retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
55 if (retval)
56 goto fail;
57
58 usbh_clk = devm_clk_get(&pdev->dev, NULL);
59 if (IS_ERR(usbh_clk)) {
60 dev_err(&pdev->dev, "Error getting interface clock\n");
61 retval = PTR_ERR(usbh_clk);
62 goto fail;
63 }
64
65 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
66 if (!hcd) {
67 retval = -ENOMEM;
68 goto fail;
69 }
70
71 hcd->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
72 if (IS_ERR(hcd->regs)) {
73 retval = PTR_ERR(hcd->regs);
74 goto err_put_hcd;
75 }
76
77 hcd->rsrc_start = res->start;
78 hcd->rsrc_len = resource_size(res);
79
80 sohci_p = to_spear_ohci(hcd);
81 sohci_p->clk = usbh_clk;
82
83 clk_prepare_enable(sohci_p->clk);
84
85 retval = usb_add_hcd(hcd, irq, 0);
86 if (retval == 0) {
87 device_wakeup_enable(hcd->self.controller);
88 return retval;
89 }
90
91 clk_disable_unprepare(sohci_p->clk);
92err_put_hcd:
93 usb_put_hcd(hcd);
94fail:
95 dev_err(&pdev->dev, "init fail, %d\n", retval);
96
97 return retval;
98}
99
100static void spear_ohci_hcd_drv_remove(struct platform_device *pdev)
101{
102 struct usb_hcd *hcd = platform_get_drvdata(pdev);
103 struct spear_ohci *sohci_p = to_spear_ohci(hcd);
104
105 usb_remove_hcd(hcd);
106 if (sohci_p->clk)
107 clk_disable_unprepare(sohci_p->clk);
108
109 usb_put_hcd(hcd);
110}
111
112#if defined(CONFIG_PM)
113static int spear_ohci_hcd_drv_suspend(struct platform_device *pdev,
114 pm_message_t message)
115{
116 struct usb_hcd *hcd = platform_get_drvdata(pdev);
117 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
118 struct spear_ohci *sohci_p = to_spear_ohci(hcd);
119 bool do_wakeup = device_may_wakeup(&pdev->dev);
120 int ret;
121
122 if (time_before(jiffies, ohci->next_statechange))
123 msleep(5);
124 ohci->next_statechange = jiffies;
125
126 ret = ohci_suspend(hcd, do_wakeup);
127 if (ret)
128 return ret;
129
130 clk_disable_unprepare(sohci_p->clk);
131
132 return ret;
133}
134
135static int spear_ohci_hcd_drv_resume(struct platform_device *dev)
136{
137 struct usb_hcd *hcd = platform_get_drvdata(dev);
138 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
139 struct spear_ohci *sohci_p = to_spear_ohci(hcd);
140
141 if (time_before(jiffies, ohci->next_statechange))
142 msleep(5);
143 ohci->next_statechange = jiffies;
144
145 clk_prepare_enable(sohci_p->clk);
146 ohci_resume(hcd, false);
147 return 0;
148}
149#endif
150
151static const struct of_device_id spear_ohci_id_table[] = {
152 { .compatible = "st,spear600-ohci", },
153 { },
154};
155MODULE_DEVICE_TABLE(of, spear_ohci_id_table);
156
157/* Driver definition to register with the platform bus */
158static struct platform_driver spear_ohci_hcd_driver = {
159 .probe = spear_ohci_hcd_drv_probe,
160 .remove_new = spear_ohci_hcd_drv_remove,
161#ifdef CONFIG_PM
162 .suspend = spear_ohci_hcd_drv_suspend,
163 .resume = spear_ohci_hcd_drv_resume,
164#endif
165 .driver = {
166 .name = "spear-ohci",
167 .of_match_table = spear_ohci_id_table,
168 },
169};
170
171static const struct ohci_driver_overrides spear_overrides __initconst = {
172 .extra_priv_size = sizeof(struct spear_ohci),
173};
174static int __init ohci_spear_init(void)
175{
176 if (usb_disabled())
177 return -ENODEV;
178
179 ohci_init_driver(&ohci_spear_hc_driver, &spear_overrides);
180 return platform_driver_register(&spear_ohci_hcd_driver);
181}
182module_init(ohci_spear_init);
183
184static void __exit ohci_spear_cleanup(void)
185{
186 platform_driver_unregister(&spear_ohci_hcd_driver);
187}
188module_exit(ohci_spear_cleanup);
189
190MODULE_DESCRIPTION(DRIVER_DESC);
191MODULE_AUTHOR("Deepak Sikri");
192MODULE_LICENSE("GPL v2");
193MODULE_ALIAS("platform:spear-ohci");
1// SPDX-License-Identifier: GPL-2.0
2/*
3* OHCI HCD (Host Controller Driver) for USB.
4*
5* Copyright (C) 2010 ST Microelectronics.
6* Deepak Sikri<deepak.sikri@st.com>
7*
8* Based on various ohci-*.c drivers
9*/
10
11#include <linux/clk.h>
12#include <linux/dma-mapping.h>
13#include <linux/io.h>
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/of.h>
17#include <linux/platform_device.h>
18#include <linux/signal.h>
19#include <linux/usb.h>
20#include <linux/usb/hcd.h>
21
22#include "ohci.h"
23
24#define DRIVER_DESC "OHCI SPEAr driver"
25
26struct spear_ohci {
27 struct clk *clk;
28};
29
30#define to_spear_ohci(hcd) (struct spear_ohci *)(hcd_to_ohci(hcd)->priv)
31
32static struct hc_driver __read_mostly ohci_spear_hc_driver;
33
34static int spear_ohci_hcd_drv_probe(struct platform_device *pdev)
35{
36 const struct hc_driver *driver = &ohci_spear_hc_driver;
37 struct usb_hcd *hcd = NULL;
38 struct clk *usbh_clk;
39 struct spear_ohci *sohci_p;
40 struct resource *res;
41 int retval, irq;
42
43 irq = platform_get_irq(pdev, 0);
44 if (irq < 0) {
45 retval = irq;
46 goto fail;
47 }
48
49 /*
50 * Right now device-tree probed devices don't get dma_mask set.
51 * Since shared usb code relies on it, set it here for now.
52 * Once we have dma capability bindings this can go away.
53 */
54 retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
55 if (retval)
56 goto fail;
57
58 usbh_clk = devm_clk_get(&pdev->dev, NULL);
59 if (IS_ERR(usbh_clk)) {
60 dev_err(&pdev->dev, "Error getting interface clock\n");
61 retval = PTR_ERR(usbh_clk);
62 goto fail;
63 }
64
65 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
66 if (!hcd) {
67 retval = -ENOMEM;
68 goto fail;
69 }
70
71 hcd->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
72 if (IS_ERR(hcd->regs)) {
73 retval = PTR_ERR(hcd->regs);
74 goto err_put_hcd;
75 }
76
77 hcd->rsrc_start = res->start;
78 hcd->rsrc_len = resource_size(res);
79
80 sohci_p = to_spear_ohci(hcd);
81 sohci_p->clk = usbh_clk;
82
83 clk_prepare_enable(sohci_p->clk);
84
85 retval = usb_add_hcd(hcd, irq, 0);
86 if (retval == 0) {
87 device_wakeup_enable(hcd->self.controller);
88 return retval;
89 }
90
91 clk_disable_unprepare(sohci_p->clk);
92err_put_hcd:
93 usb_put_hcd(hcd);
94fail:
95 dev_err(&pdev->dev, "init fail, %d\n", retval);
96
97 return retval;
98}
99
100static void spear_ohci_hcd_drv_remove(struct platform_device *pdev)
101{
102 struct usb_hcd *hcd = platform_get_drvdata(pdev);
103 struct spear_ohci *sohci_p = to_spear_ohci(hcd);
104
105 usb_remove_hcd(hcd);
106 if (sohci_p->clk)
107 clk_disable_unprepare(sohci_p->clk);
108
109 usb_put_hcd(hcd);
110}
111
112#if defined(CONFIG_PM)
113static int spear_ohci_hcd_drv_suspend(struct platform_device *pdev,
114 pm_message_t message)
115{
116 struct usb_hcd *hcd = platform_get_drvdata(pdev);
117 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
118 struct spear_ohci *sohci_p = to_spear_ohci(hcd);
119 bool do_wakeup = device_may_wakeup(&pdev->dev);
120 int ret;
121
122 if (time_before(jiffies, ohci->next_statechange))
123 msleep(5);
124 ohci->next_statechange = jiffies;
125
126 ret = ohci_suspend(hcd, do_wakeup);
127 if (ret)
128 return ret;
129
130 clk_disable_unprepare(sohci_p->clk);
131
132 return ret;
133}
134
135static int spear_ohci_hcd_drv_resume(struct platform_device *dev)
136{
137 struct usb_hcd *hcd = platform_get_drvdata(dev);
138 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
139 struct spear_ohci *sohci_p = to_spear_ohci(hcd);
140
141 if (time_before(jiffies, ohci->next_statechange))
142 msleep(5);
143 ohci->next_statechange = jiffies;
144
145 clk_prepare_enable(sohci_p->clk);
146 ohci_resume(hcd, false);
147 return 0;
148}
149#endif
150
151static const struct of_device_id spear_ohci_id_table[] = {
152 { .compatible = "st,spear600-ohci", },
153 { },
154};
155MODULE_DEVICE_TABLE(of, spear_ohci_id_table);
156
157/* Driver definition to register with the platform bus */
158static struct platform_driver spear_ohci_hcd_driver = {
159 .probe = spear_ohci_hcd_drv_probe,
160 .remove_new = spear_ohci_hcd_drv_remove,
161#ifdef CONFIG_PM
162 .suspend = spear_ohci_hcd_drv_suspend,
163 .resume = spear_ohci_hcd_drv_resume,
164#endif
165 .driver = {
166 .name = "spear-ohci",
167 .of_match_table = spear_ohci_id_table,
168 },
169};
170
171static const struct ohci_driver_overrides spear_overrides __initconst = {
172 .extra_priv_size = sizeof(struct spear_ohci),
173};
174static int __init ohci_spear_init(void)
175{
176 if (usb_disabled())
177 return -ENODEV;
178
179 ohci_init_driver(&ohci_spear_hc_driver, &spear_overrides);
180 return platform_driver_register(&spear_ohci_hcd_driver);
181}
182module_init(ohci_spear_init);
183
184static void __exit ohci_spear_cleanup(void)
185{
186 platform_driver_unregister(&spear_ohci_hcd_driver);
187}
188module_exit(ohci_spear_cleanup);
189
190MODULE_DESCRIPTION(DRIVER_DESC);
191MODULE_AUTHOR("Deepak Sikri");
192MODULE_LICENSE("GPL v2");
193MODULE_ALIAS("platform:spear-ohci");