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1// SPDX-License-Identifier: GPL-2.0
2/*
3* Driver for EHCI HCD on SPEAr SOC
4*
5* Copyright (C) 2010 ST Micro Electronics,
6* Deepak Sikri <deepak.sikri@st.com>
7*
8* Based on various ehci-*.c drivers
9*/
10
11#include <linux/clk.h>
12#include <linux/dma-mapping.h>
13#include <linux/io.h>
14#include <linux/jiffies.h>
15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/of.h>
18#include <linux/platform_device.h>
19#include <linux/pm.h>
20#include <linux/usb.h>
21#include <linux/usb/hcd.h>
22
23#include "ehci.h"
24
25#define DRIVER_DESC "EHCI SPEAr driver"
26
27struct spear_ehci {
28 struct clk *clk;
29};
30
31#define to_spear_ehci(hcd) (struct spear_ehci *)(hcd_to_ehci(hcd)->priv)
32
33static struct hc_driver __read_mostly ehci_spear_hc_driver;
34
35static int __maybe_unused ehci_spear_drv_suspend(struct device *dev)
36{
37 struct usb_hcd *hcd = dev_get_drvdata(dev);
38 bool do_wakeup = device_may_wakeup(dev);
39
40 return ehci_suspend(hcd, do_wakeup);
41}
42
43static int __maybe_unused ehci_spear_drv_resume(struct device *dev)
44{
45 struct usb_hcd *hcd = dev_get_drvdata(dev);
46
47 ehci_resume(hcd, false);
48 return 0;
49}
50
51static SIMPLE_DEV_PM_OPS(ehci_spear_pm_ops, ehci_spear_drv_suspend,
52 ehci_spear_drv_resume);
53
54static int spear_ehci_hcd_drv_probe(struct platform_device *pdev)
55{
56 struct usb_hcd *hcd ;
57 struct spear_ehci *sehci;
58 struct resource *res;
59 struct clk *usbh_clk;
60 const struct hc_driver *driver = &ehci_spear_hc_driver;
61 int irq, retval;
62
63 if (usb_disabled())
64 return -ENODEV;
65
66 irq = platform_get_irq(pdev, 0);
67 if (irq < 0) {
68 retval = irq;
69 goto fail;
70 }
71
72 /*
73 * Right now device-tree probed devices don't get dma_mask set.
74 * Since shared usb code relies on it, set it here for now.
75 * Once we have dma capability bindings this can go away.
76 */
77 retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
78 if (retval)
79 goto fail;
80
81 usbh_clk = devm_clk_get(&pdev->dev, NULL);
82 if (IS_ERR(usbh_clk)) {
83 dev_err(&pdev->dev, "Error getting interface clock\n");
84 retval = PTR_ERR(usbh_clk);
85 goto fail;
86 }
87
88 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
89 if (!hcd) {
90 retval = -ENOMEM;
91 goto fail;
92 }
93
94 hcd->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
95 if (IS_ERR(hcd->regs)) {
96 retval = PTR_ERR(hcd->regs);
97 goto err_put_hcd;
98 }
99 hcd->rsrc_start = res->start;
100 hcd->rsrc_len = resource_size(res);
101
102 sehci = to_spear_ehci(hcd);
103 sehci->clk = usbh_clk;
104
105 /* registers start at offset 0x0 */
106 hcd_to_ehci(hcd)->caps = hcd->regs;
107
108 clk_prepare_enable(sehci->clk);
109 retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
110 if (retval)
111 goto err_stop_ehci;
112
113 device_wakeup_enable(hcd->self.controller);
114 return retval;
115
116err_stop_ehci:
117 clk_disable_unprepare(sehci->clk);
118err_put_hcd:
119 usb_put_hcd(hcd);
120fail:
121 dev_err(&pdev->dev, "init fail, %d\n", retval);
122
123 return retval ;
124}
125
126static void spear_ehci_hcd_drv_remove(struct platform_device *pdev)
127{
128 struct usb_hcd *hcd = platform_get_drvdata(pdev);
129 struct spear_ehci *sehci = to_spear_ehci(hcd);
130
131 usb_remove_hcd(hcd);
132
133 if (sehci->clk)
134 clk_disable_unprepare(sehci->clk);
135 usb_put_hcd(hcd);
136}
137
138static const struct of_device_id spear_ehci_id_table[] = {
139 { .compatible = "st,spear600-ehci", },
140 { },
141};
142MODULE_DEVICE_TABLE(of, spear_ehci_id_table);
143
144static struct platform_driver spear_ehci_hcd_driver = {
145 .probe = spear_ehci_hcd_drv_probe,
146 .remove_new = spear_ehci_hcd_drv_remove,
147 .shutdown = usb_hcd_platform_shutdown,
148 .driver = {
149 .name = "spear-ehci",
150 .bus = &platform_bus_type,
151 .pm = pm_ptr(&ehci_spear_pm_ops),
152 .of_match_table = spear_ehci_id_table,
153 }
154};
155
156static const struct ehci_driver_overrides spear_overrides __initconst = {
157 .extra_priv_size = sizeof(struct spear_ehci),
158};
159
160static int __init ehci_spear_init(void)
161{
162 if (usb_disabled())
163 return -ENODEV;
164
165 ehci_init_driver(&ehci_spear_hc_driver, &spear_overrides);
166 return platform_driver_register(&spear_ehci_hcd_driver);
167}
168module_init(ehci_spear_init);
169
170static void __exit ehci_spear_cleanup(void)
171{
172 platform_driver_unregister(&spear_ehci_hcd_driver);
173}
174module_exit(ehci_spear_cleanup);
175
176MODULE_DESCRIPTION(DRIVER_DESC);
177MODULE_ALIAS("platform:spear-ehci");
178MODULE_AUTHOR("Deepak Sikri");
179MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0
2/*
3* Driver for EHCI HCD on SPEAr SOC
4*
5* Copyright (C) 2010 ST Micro Electronics,
6* Deepak Sikri <deepak.sikri@st.com>
7*
8* Based on various ehci-*.c drivers
9*/
10
11#include <linux/clk.h>
12#include <linux/dma-mapping.h>
13#include <linux/io.h>
14#include <linux/jiffies.h>
15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/of.h>
18#include <linux/platform_device.h>
19#include <linux/pm.h>
20#include <linux/usb.h>
21#include <linux/usb/hcd.h>
22
23#include "ehci.h"
24
25#define DRIVER_DESC "EHCI SPEAr driver"
26
27static const char hcd_name[] = "SPEAr-ehci";
28
29struct spear_ehci {
30 struct clk *clk;
31};
32
33#define to_spear_ehci(hcd) (struct spear_ehci *)(hcd_to_ehci(hcd)->priv)
34
35static struct hc_driver __read_mostly ehci_spear_hc_driver;
36
37#ifdef CONFIG_PM_SLEEP
38static int ehci_spear_drv_suspend(struct device *dev)
39{
40 struct usb_hcd *hcd = dev_get_drvdata(dev);
41 bool do_wakeup = device_may_wakeup(dev);
42
43 return ehci_suspend(hcd, do_wakeup);
44}
45
46static int ehci_spear_drv_resume(struct device *dev)
47{
48 struct usb_hcd *hcd = dev_get_drvdata(dev);
49
50 ehci_resume(hcd, false);
51 return 0;
52}
53#endif /* CONFIG_PM_SLEEP */
54
55static SIMPLE_DEV_PM_OPS(ehci_spear_pm_ops, ehci_spear_drv_suspend,
56 ehci_spear_drv_resume);
57
58static int spear_ehci_hcd_drv_probe(struct platform_device *pdev)
59{
60 struct usb_hcd *hcd ;
61 struct spear_ehci *sehci;
62 struct resource *res;
63 struct clk *usbh_clk;
64 const struct hc_driver *driver = &ehci_spear_hc_driver;
65 int irq, retval;
66
67 if (usb_disabled())
68 return -ENODEV;
69
70 irq = platform_get_irq(pdev, 0);
71 if (irq < 0) {
72 retval = irq;
73 goto fail;
74 }
75
76 /*
77 * Right now device-tree probed devices don't get dma_mask set.
78 * Since shared usb code relies on it, set it here for now.
79 * Once we have dma capability bindings this can go away.
80 */
81 retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
82 if (retval)
83 goto fail;
84
85 usbh_clk = devm_clk_get(&pdev->dev, NULL);
86 if (IS_ERR(usbh_clk)) {
87 dev_err(&pdev->dev, "Error getting interface clock\n");
88 retval = PTR_ERR(usbh_clk);
89 goto fail;
90 }
91
92 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
93 if (!hcd) {
94 retval = -ENOMEM;
95 goto fail;
96 }
97
98 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
99 hcd->regs = devm_ioremap_resource(&pdev->dev, res);
100 if (IS_ERR(hcd->regs)) {
101 retval = PTR_ERR(hcd->regs);
102 goto err_put_hcd;
103 }
104 hcd->rsrc_start = res->start;
105 hcd->rsrc_len = resource_size(res);
106
107 sehci = to_spear_ehci(hcd);
108 sehci->clk = usbh_clk;
109
110 /* registers start at offset 0x0 */
111 hcd_to_ehci(hcd)->caps = hcd->regs;
112
113 clk_prepare_enable(sehci->clk);
114 retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
115 if (retval)
116 goto err_stop_ehci;
117
118 device_wakeup_enable(hcd->self.controller);
119 return retval;
120
121err_stop_ehci:
122 clk_disable_unprepare(sehci->clk);
123err_put_hcd:
124 usb_put_hcd(hcd);
125fail:
126 dev_err(&pdev->dev, "init fail, %d\n", retval);
127
128 return retval ;
129}
130
131static int spear_ehci_hcd_drv_remove(struct platform_device *pdev)
132{
133 struct usb_hcd *hcd = platform_get_drvdata(pdev);
134 struct spear_ehci *sehci = to_spear_ehci(hcd);
135
136 usb_remove_hcd(hcd);
137
138 if (sehci->clk)
139 clk_disable_unprepare(sehci->clk);
140 usb_put_hcd(hcd);
141
142 return 0;
143}
144
145static const struct of_device_id spear_ehci_id_table[] = {
146 { .compatible = "st,spear600-ehci", },
147 { },
148};
149MODULE_DEVICE_TABLE(of, spear_ehci_id_table);
150
151static struct platform_driver spear_ehci_hcd_driver = {
152 .probe = spear_ehci_hcd_drv_probe,
153 .remove = spear_ehci_hcd_drv_remove,
154 .shutdown = usb_hcd_platform_shutdown,
155 .driver = {
156 .name = "spear-ehci",
157 .bus = &platform_bus_type,
158 .pm = &ehci_spear_pm_ops,
159 .of_match_table = spear_ehci_id_table,
160 }
161};
162
163static const struct ehci_driver_overrides spear_overrides __initconst = {
164 .extra_priv_size = sizeof(struct spear_ehci),
165};
166
167static int __init ehci_spear_init(void)
168{
169 if (usb_disabled())
170 return -ENODEV;
171
172 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
173
174 ehci_init_driver(&ehci_spear_hc_driver, &spear_overrides);
175 return platform_driver_register(&spear_ehci_hcd_driver);
176}
177module_init(ehci_spear_init);
178
179static void __exit ehci_spear_cleanup(void)
180{
181 platform_driver_unregister(&spear_ehci_hcd_driver);
182}
183module_exit(ehci_spear_cleanup);
184
185MODULE_DESCRIPTION(DRIVER_DESC);
186MODULE_ALIAS("platform:spear-ehci");
187MODULE_AUTHOR("Deepak Sikri");
188MODULE_LICENSE("GPL");