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1/*
2* Driver for EHCI HCD on SPEAr SOC
3*
4* Copyright (C) 2010 ST Micro Electronics,
5* Deepak Sikri <deepak.sikri@st.com>
6*
7* Based on various ehci-*.c drivers
8*
9* This file is subject to the terms and conditions of the GNU General Public
10* License. See the file COPYING in the main directory of this archive for
11* more details.
12*/
13
14#include <linux/clk.h>
15#include <linux/dma-mapping.h>
16#include <linux/io.h>
17#include <linux/jiffies.h>
18#include <linux/kernel.h>
19#include <linux/module.h>
20#include <linux/of.h>
21#include <linux/platform_device.h>
22#include <linux/pm.h>
23#include <linux/usb.h>
24#include <linux/usb/hcd.h>
25
26#include "ehci.h"
27
28#define DRIVER_DESC "EHCI SPEAr driver"
29
30static const char hcd_name[] = "SPEAr-ehci";
31
32struct spear_ehci {
33 struct clk *clk;
34};
35
36#define to_spear_ehci(hcd) (struct spear_ehci *)(hcd_to_ehci(hcd)->priv)
37
38static struct hc_driver __read_mostly ehci_spear_hc_driver;
39
40#ifdef CONFIG_PM_SLEEP
41static int ehci_spear_drv_suspend(struct device *dev)
42{
43 struct usb_hcd *hcd = dev_get_drvdata(dev);
44 bool do_wakeup = device_may_wakeup(dev);
45
46 return ehci_suspend(hcd, do_wakeup);
47}
48
49static int ehci_spear_drv_resume(struct device *dev)
50{
51 struct usb_hcd *hcd = dev_get_drvdata(dev);
52
53 ehci_resume(hcd, false);
54 return 0;
55}
56#endif /* CONFIG_PM_SLEEP */
57
58static SIMPLE_DEV_PM_OPS(ehci_spear_pm_ops, ehci_spear_drv_suspend,
59 ehci_spear_drv_resume);
60
61static int spear_ehci_hcd_drv_probe(struct platform_device *pdev)
62{
63 struct usb_hcd *hcd ;
64 struct spear_ehci *sehci;
65 struct resource *res;
66 struct clk *usbh_clk;
67 const struct hc_driver *driver = &ehci_spear_hc_driver;
68 int irq, retval;
69
70 if (usb_disabled())
71 return -ENODEV;
72
73 irq = platform_get_irq(pdev, 0);
74 if (irq < 0) {
75 retval = irq;
76 goto fail;
77 }
78
79 /*
80 * Right now device-tree probed devices don't get dma_mask set.
81 * Since shared usb code relies on it, set it here for now.
82 * Once we have dma capability bindings this can go away.
83 */
84 retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
85 if (retval)
86 goto fail;
87
88 usbh_clk = devm_clk_get(&pdev->dev, NULL);
89 if (IS_ERR(usbh_clk)) {
90 dev_err(&pdev->dev, "Error getting interface clock\n");
91 retval = PTR_ERR(usbh_clk);
92 goto fail;
93 }
94
95 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
96 if (!hcd) {
97 retval = -ENOMEM;
98 goto fail;
99 }
100
101 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
102 hcd->regs = devm_ioremap_resource(&pdev->dev, res);
103 if (IS_ERR(hcd->regs)) {
104 retval = PTR_ERR(hcd->regs);
105 goto err_put_hcd;
106 }
107 hcd->rsrc_start = res->start;
108 hcd->rsrc_len = resource_size(res);
109
110 sehci = to_spear_ehci(hcd);
111 sehci->clk = usbh_clk;
112
113 /* registers start at offset 0x0 */
114 hcd_to_ehci(hcd)->caps = hcd->regs;
115
116 clk_prepare_enable(sehci->clk);
117 retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
118 if (retval)
119 goto err_stop_ehci;
120
121 device_wakeup_enable(hcd->self.controller);
122 return retval;
123
124err_stop_ehci:
125 clk_disable_unprepare(sehci->clk);
126err_put_hcd:
127 usb_put_hcd(hcd);
128fail:
129 dev_err(&pdev->dev, "init fail, %d\n", retval);
130
131 return retval ;
132}
133
134static int spear_ehci_hcd_drv_remove(struct platform_device *pdev)
135{
136 struct usb_hcd *hcd = platform_get_drvdata(pdev);
137 struct spear_ehci *sehci = to_spear_ehci(hcd);
138
139 usb_remove_hcd(hcd);
140
141 if (sehci->clk)
142 clk_disable_unprepare(sehci->clk);
143 usb_put_hcd(hcd);
144
145 return 0;
146}
147
148static const struct of_device_id spear_ehci_id_table[] = {
149 { .compatible = "st,spear600-ehci", },
150 { },
151};
152MODULE_DEVICE_TABLE(of, spear_ehci_id_table);
153
154static struct platform_driver spear_ehci_hcd_driver = {
155 .probe = spear_ehci_hcd_drv_probe,
156 .remove = spear_ehci_hcd_drv_remove,
157 .shutdown = usb_hcd_platform_shutdown,
158 .driver = {
159 .name = "spear-ehci",
160 .bus = &platform_bus_type,
161 .pm = &ehci_spear_pm_ops,
162 .of_match_table = spear_ehci_id_table,
163 }
164};
165
166static const struct ehci_driver_overrides spear_overrides __initdata = {
167 .extra_priv_size = sizeof(struct spear_ehci),
168};
169
170static int __init ehci_spear_init(void)
171{
172 if (usb_disabled())
173 return -ENODEV;
174
175 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
176
177 ehci_init_driver(&ehci_spear_hc_driver, &spear_overrides);
178 return platform_driver_register(&spear_ehci_hcd_driver);
179}
180module_init(ehci_spear_init);
181
182static void __exit ehci_spear_cleanup(void)
183{
184 platform_driver_unregister(&spear_ehci_hcd_driver);
185}
186module_exit(ehci_spear_cleanup);
187
188MODULE_DESCRIPTION(DRIVER_DESC);
189MODULE_ALIAS("platform:spear-ehci");
190MODULE_AUTHOR("Deepak Sikri");
191MODULE_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
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 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
95 hcd->regs = devm_ioremap_resource(&pdev->dev, res);
96 if (IS_ERR(hcd->regs)) {
97 retval = PTR_ERR(hcd->regs);
98 goto err_put_hcd;
99 }
100 hcd->rsrc_start = res->start;
101 hcd->rsrc_len = resource_size(res);
102
103 sehci = to_spear_ehci(hcd);
104 sehci->clk = usbh_clk;
105
106 /* registers start at offset 0x0 */
107 hcd_to_ehci(hcd)->caps = hcd->regs;
108
109 clk_prepare_enable(sehci->clk);
110 retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
111 if (retval)
112 goto err_stop_ehci;
113
114 device_wakeup_enable(hcd->self.controller);
115 return retval;
116
117err_stop_ehci:
118 clk_disable_unprepare(sehci->clk);
119err_put_hcd:
120 usb_put_hcd(hcd);
121fail:
122 dev_err(&pdev->dev, "init fail, %d\n", retval);
123
124 return retval ;
125}
126
127static int spear_ehci_hcd_drv_remove(struct platform_device *pdev)
128{
129 struct usb_hcd *hcd = platform_get_drvdata(pdev);
130 struct spear_ehci *sehci = to_spear_ehci(hcd);
131
132 usb_remove_hcd(hcd);
133
134 if (sehci->clk)
135 clk_disable_unprepare(sehci->clk);
136 usb_put_hcd(hcd);
137
138 return 0;
139}
140
141static const struct of_device_id spear_ehci_id_table[] = {
142 { .compatible = "st,spear600-ehci", },
143 { },
144};
145MODULE_DEVICE_TABLE(of, spear_ehci_id_table);
146
147static struct platform_driver spear_ehci_hcd_driver = {
148 .probe = spear_ehci_hcd_drv_probe,
149 .remove = spear_ehci_hcd_drv_remove,
150 .shutdown = usb_hcd_platform_shutdown,
151 .driver = {
152 .name = "spear-ehci",
153 .bus = &platform_bus_type,
154 .pm = pm_ptr(&ehci_spear_pm_ops),
155 .of_match_table = spear_ehci_id_table,
156 }
157};
158
159static const struct ehci_driver_overrides spear_overrides __initconst = {
160 .extra_priv_size = sizeof(struct spear_ehci),
161};
162
163static int __init ehci_spear_init(void)
164{
165 if (usb_disabled())
166 return -ENODEV;
167
168 ehci_init_driver(&ehci_spear_hc_driver, &spear_overrides);
169 return platform_driver_register(&spear_ehci_hcd_driver);
170}
171module_init(ehci_spear_init);
172
173static void __exit ehci_spear_cleanup(void)
174{
175 platform_driver_unregister(&spear_ehci_hcd_driver);
176}
177module_exit(ehci_spear_cleanup);
178
179MODULE_DESCRIPTION(DRIVER_DESC);
180MODULE_ALIAS("platform:spear-ehci");
181MODULE_AUTHOR("Deepak Sikri");
182MODULE_LICENSE("GPL");