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1/*
2* OHCI HCD (Host Controller Driver) for USB.
3*
4* Copyright (C) 2010 ST Microelectronics.
5* Deepak Sikri<deepak.sikri@st.com>
6*
7* Based on various ohci-*.c drivers
8*
9* This file is licensed under the terms of the GNU General Public
10* License version 2. This program is licensed "as is" without any
11* warranty of any kind, whether express or implied.
12*/
13
14#include <linux/clk.h>
15#include <linux/dma-mapping.h>
16#include <linux/io.h>
17#include <linux/kernel.h>
18#include <linux/module.h>
19#include <linux/of.h>
20#include <linux/platform_device.h>
21#include <linux/signal.h>
22#include <linux/usb.h>
23#include <linux/usb/hcd.h>
24
25#include "ohci.h"
26
27#define DRIVER_DESC "OHCI SPEAr driver"
28
29static const char hcd_name[] = "SPEAr-ohci";
30struct spear_ohci {
31 struct clk *clk;
32};
33
34#define to_spear_ohci(hcd) (struct spear_ohci *)(hcd_to_ohci(hcd)->priv)
35
36static struct hc_driver __read_mostly ohci_spear_hc_driver;
37
38static int spear_ohci_hcd_drv_probe(struct platform_device *pdev)
39{
40 const struct hc_driver *driver = &ohci_spear_hc_driver;
41 struct ohci_hcd *ohci;
42 struct usb_hcd *hcd = NULL;
43 struct clk *usbh_clk;
44 struct spear_ohci *sohci_p;
45 struct resource *res;
46 int retval, irq;
47
48 irq = platform_get_irq(pdev, 0);
49 if (irq < 0) {
50 retval = irq;
51 goto fail;
52 }
53
54 /*
55 * Right now device-tree probed devices don't get dma_mask set.
56 * Since shared usb code relies on it, set it here for now.
57 * Once we have dma capability bindings this can go away.
58 */
59 retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
60 if (retval)
61 goto fail;
62
63 usbh_clk = devm_clk_get(&pdev->dev, NULL);
64 if (IS_ERR(usbh_clk)) {
65 dev_err(&pdev->dev, "Error getting interface clock\n");
66 retval = PTR_ERR(usbh_clk);
67 goto fail;
68 }
69
70 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
71 if (!hcd) {
72 retval = -ENOMEM;
73 goto fail;
74 }
75
76 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
77 hcd->regs = devm_ioremap_resource(&pdev->dev, res);
78 if (IS_ERR(hcd->regs)) {
79 retval = PTR_ERR(hcd->regs);
80 goto err_put_hcd;
81 }
82
83 hcd->rsrc_start = pdev->resource[0].start;
84 hcd->rsrc_len = resource_size(res);
85
86 sohci_p = to_spear_ohci(hcd);
87 sohci_p->clk = usbh_clk;
88
89 clk_prepare_enable(sohci_p->clk);
90
91 ohci = hcd_to_ohci(hcd);
92
93 retval = usb_add_hcd(hcd, platform_get_irq(pdev, 0), 0);
94 if (retval == 0) {
95 device_wakeup_enable(hcd->self.controller);
96 return retval;
97 }
98
99 clk_disable_unprepare(sohci_p->clk);
100err_put_hcd:
101 usb_put_hcd(hcd);
102fail:
103 dev_err(&pdev->dev, "init fail, %d\n", retval);
104
105 return retval;
106}
107
108static int spear_ohci_hcd_drv_remove(struct platform_device *pdev)
109{
110 struct usb_hcd *hcd = platform_get_drvdata(pdev);
111 struct spear_ohci *sohci_p = to_spear_ohci(hcd);
112
113 usb_remove_hcd(hcd);
114 if (sohci_p->clk)
115 clk_disable_unprepare(sohci_p->clk);
116
117 usb_put_hcd(hcd);
118 return 0;
119}
120
121#if defined(CONFIG_PM)
122static int spear_ohci_hcd_drv_suspend(struct platform_device *pdev,
123 pm_message_t message)
124{
125 struct usb_hcd *hcd = platform_get_drvdata(pdev);
126 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
127 struct spear_ohci *sohci_p = to_spear_ohci(hcd);
128 bool do_wakeup = device_may_wakeup(&pdev->dev);
129 int ret;
130
131 if (time_before(jiffies, ohci->next_statechange))
132 msleep(5);
133 ohci->next_statechange = jiffies;
134
135 ret = ohci_suspend(hcd, do_wakeup);
136 if (ret)
137 return ret;
138
139 clk_disable_unprepare(sohci_p->clk);
140
141 return ret;
142}
143
144static int spear_ohci_hcd_drv_resume(struct platform_device *dev)
145{
146 struct usb_hcd *hcd = platform_get_drvdata(dev);
147 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
148 struct spear_ohci *sohci_p = to_spear_ohci(hcd);
149
150 if (time_before(jiffies, ohci->next_statechange))
151 msleep(5);
152 ohci->next_statechange = jiffies;
153
154 clk_prepare_enable(sohci_p->clk);
155 ohci_resume(hcd, false);
156 return 0;
157}
158#endif
159
160static const struct of_device_id spear_ohci_id_table[] = {
161 { .compatible = "st,spear600-ohci", },
162 { },
163};
164MODULE_DEVICE_TABLE(of, spear_ohci_id_table);
165
166/* Driver definition to register with the platform bus */
167static struct platform_driver spear_ohci_hcd_driver = {
168 .probe = spear_ohci_hcd_drv_probe,
169 .remove = spear_ohci_hcd_drv_remove,
170#ifdef CONFIG_PM
171 .suspend = spear_ohci_hcd_drv_suspend,
172 .resume = spear_ohci_hcd_drv_resume,
173#endif
174 .driver = {
175 .name = "spear-ohci",
176 .of_match_table = spear_ohci_id_table,
177 },
178};
179
180static const struct ohci_driver_overrides spear_overrides __initconst = {
181 .extra_priv_size = sizeof(struct spear_ohci),
182};
183static int __init ohci_spear_init(void)
184{
185 if (usb_disabled())
186 return -ENODEV;
187
188 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
189
190 ohci_init_driver(&ohci_spear_hc_driver, &spear_overrides);
191 return platform_driver_register(&spear_ohci_hcd_driver);
192}
193module_init(ohci_spear_init);
194
195static void __exit ohci_spear_cleanup(void)
196{
197 platform_driver_unregister(&spear_ohci_hcd_driver);
198}
199module_exit(ohci_spear_cleanup);
200
201MODULE_DESCRIPTION(DRIVER_DESC);
202MODULE_AUTHOR("Deepak Sikri");
203MODULE_LICENSE("GPL v2");
204MODULE_ALIAS("platform:spear-ohci");
1/*
2* OHCI HCD (Host Controller Driver) for USB.
3*
4* Copyright (C) 2010 ST Microelectronics.
5* Deepak Sikri<deepak.sikri@st.com>
6*
7* Based on various ohci-*.c drivers
8*
9* This file is licensed under the terms of the GNU General Public
10* License version 2. This program is licensed "as is" without any
11* warranty of any kind, whether express or implied.
12*/
13
14#include <linux/signal.h>
15#include <linux/platform_device.h>
16#include <linux/clk.h>
17#include <linux/of.h>
18
19struct spear_ohci {
20 struct ohci_hcd ohci;
21 struct clk *clk;
22};
23
24#define to_spear_ohci(hcd) (struct spear_ohci *)hcd_to_ohci(hcd)
25
26static void spear_start_ohci(struct spear_ohci *ohci)
27{
28 clk_prepare_enable(ohci->clk);
29}
30
31static void spear_stop_ohci(struct spear_ohci *ohci)
32{
33 clk_disable_unprepare(ohci->clk);
34}
35
36static int __devinit ohci_spear_start(struct usb_hcd *hcd)
37{
38 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
39 int ret;
40
41 ret = ohci_init(ohci);
42 if (ret < 0)
43 return ret;
44 ohci->regs = hcd->regs;
45
46 ret = ohci_run(ohci);
47 if (ret < 0) {
48 dev_err(hcd->self.controller, "can't start\n");
49 ohci_stop(hcd);
50 return ret;
51 }
52
53 create_debug_files(ohci);
54
55#ifdef DEBUG
56 ohci_dump(ohci, 1);
57#endif
58 return 0;
59}
60
61static const struct hc_driver ohci_spear_hc_driver = {
62 .description = hcd_name,
63 .product_desc = "SPEAr OHCI",
64 .hcd_priv_size = sizeof(struct spear_ohci),
65
66 /* generic hardware linkage */
67 .irq = ohci_irq,
68 .flags = HCD_USB11 | HCD_MEMORY,
69
70 /* basic lifecycle operations */
71 .start = ohci_spear_start,
72 .stop = ohci_stop,
73 .shutdown = ohci_shutdown,
74#ifdef CONFIG_PM
75 .bus_suspend = ohci_bus_suspend,
76 .bus_resume = ohci_bus_resume,
77#endif
78
79 /* managing i/o requests and associated device resources */
80 .urb_enqueue = ohci_urb_enqueue,
81 .urb_dequeue = ohci_urb_dequeue,
82 .endpoint_disable = ohci_endpoint_disable,
83
84 /* scheduling support */
85 .get_frame_number = ohci_get_frame,
86
87 /* root hub support */
88 .hub_status_data = ohci_hub_status_data,
89 .hub_control = ohci_hub_control,
90
91 .start_port_reset = ohci_start_port_reset,
92};
93
94static u64 spear_ohci_dma_mask = DMA_BIT_MASK(32);
95
96static int spear_ohci_hcd_drv_probe(struct platform_device *pdev)
97{
98 const struct hc_driver *driver = &ohci_spear_hc_driver;
99 struct usb_hcd *hcd = NULL;
100 struct clk *usbh_clk;
101 struct spear_ohci *ohci_p;
102 struct resource *res;
103 int retval, irq;
104 char clk_name[20] = "usbh_clk";
105 static int instance = -1;
106
107 irq = platform_get_irq(pdev, 0);
108 if (irq < 0) {
109 retval = irq;
110 goto fail_irq_get;
111 }
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 have dma capability bindings this can go away.
117 */
118 if (!pdev->dev.dma_mask)
119 pdev->dev.dma_mask = &spear_ohci_dma_mask;
120
121 /*
122 * Increment the device instance, when probing via device-tree
123 */
124 if (pdev->id < 0)
125 instance++;
126 else
127 instance = pdev->id;
128 sprintf(clk_name, "usbh.%01d_clk", instance);
129
130 usbh_clk = clk_get(NULL, clk_name);
131 if (IS_ERR(usbh_clk)) {
132 dev_err(&pdev->dev, "Error getting interface clock\n");
133 retval = PTR_ERR(usbh_clk);
134 goto fail_get_usbh_clk;
135 }
136
137 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
138 if (!hcd) {
139 retval = -ENOMEM;
140 goto fail_create_hcd;
141 }
142
143 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
144 if (!res) {
145 retval = -ENODEV;
146 goto fail_request_resource;
147 }
148
149 hcd->rsrc_start = pdev->resource[0].start;
150 hcd->rsrc_len = resource_size(res);
151 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
152 dev_dbg(&pdev->dev, "request_mem_region failed\n");
153 retval = -EBUSY;
154 goto fail_request_resource;
155 }
156
157 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
158 if (!hcd->regs) {
159 dev_dbg(&pdev->dev, "ioremap failed\n");
160 retval = -ENOMEM;
161 goto fail_ioremap;
162 }
163
164 ohci_p = (struct spear_ohci *)hcd_to_ohci(hcd);
165 ohci_p->clk = usbh_clk;
166 spear_start_ohci(ohci_p);
167 ohci_hcd_init(hcd_to_ohci(hcd));
168
169 retval = usb_add_hcd(hcd, platform_get_irq(pdev, 0), 0);
170 if (retval == 0)
171 return retval;
172
173 spear_stop_ohci(ohci_p);
174 iounmap(hcd->regs);
175fail_ioremap:
176 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
177fail_request_resource:
178 usb_put_hcd(hcd);
179fail_create_hcd:
180 clk_put(usbh_clk);
181fail_get_usbh_clk:
182fail_irq_get:
183 dev_err(&pdev->dev, "init fail, %d\n", retval);
184
185 return retval;
186}
187
188static int spear_ohci_hcd_drv_remove(struct platform_device *pdev)
189{
190 struct usb_hcd *hcd = platform_get_drvdata(pdev);
191 struct spear_ohci *ohci_p = to_spear_ohci(hcd);
192
193 usb_remove_hcd(hcd);
194 if (ohci_p->clk)
195 spear_stop_ohci(ohci_p);
196
197 iounmap(hcd->regs);
198 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
199 usb_put_hcd(hcd);
200
201 if (ohci_p->clk)
202 clk_put(ohci_p->clk);
203 platform_set_drvdata(pdev, NULL);
204 return 0;
205}
206
207#if defined(CONFIG_PM)
208static int spear_ohci_hcd_drv_suspend(struct platform_device *dev,
209 pm_message_t message)
210{
211 struct usb_hcd *hcd = platform_get_drvdata(dev);
212 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
213 struct spear_ohci *ohci_p = to_spear_ohci(hcd);
214
215 if (time_before(jiffies, ohci->next_statechange))
216 msleep(5);
217 ohci->next_statechange = jiffies;
218
219 spear_stop_ohci(ohci_p);
220 return 0;
221}
222
223static int spear_ohci_hcd_drv_resume(struct platform_device *dev)
224{
225 struct usb_hcd *hcd = platform_get_drvdata(dev);
226 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
227 struct spear_ohci *ohci_p = to_spear_ohci(hcd);
228
229 if (time_before(jiffies, ohci->next_statechange))
230 msleep(5);
231 ohci->next_statechange = jiffies;
232
233 spear_start_ohci(ohci_p);
234 ohci_finish_controller_resume(hcd);
235 return 0;
236}
237#endif
238
239static struct of_device_id spear_ohci_id_table[] __devinitdata = {
240 { .compatible = "st,spear600-ohci", },
241 { },
242};
243
244/* Driver definition to register with the platform bus */
245static struct platform_driver spear_ohci_hcd_driver = {
246 .probe = spear_ohci_hcd_drv_probe,
247 .remove = spear_ohci_hcd_drv_remove,
248#ifdef CONFIG_PM
249 .suspend = spear_ohci_hcd_drv_suspend,
250 .resume = spear_ohci_hcd_drv_resume,
251#endif
252 .driver = {
253 .owner = THIS_MODULE,
254 .name = "spear-ohci",
255 .of_match_table = of_match_ptr(spear_ohci_id_table),
256 },
257};
258
259MODULE_ALIAS("platform:spear-ohci");