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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/platform_device.h>
15#include <linux/clk.h>
16
17struct spear_ehci {
18 struct ehci_hcd ehci;
19 struct clk *clk;
20};
21
22#define to_spear_ehci(hcd) (struct spear_ehci *)hcd_to_ehci(hcd)
23
24static void spear_start_ehci(struct spear_ehci *ehci)
25{
26 clk_enable(ehci->clk);
27}
28
29static void spear_stop_ehci(struct spear_ehci *ehci)
30{
31 clk_disable(ehci->clk);
32}
33
34static int ehci_spear_setup(struct usb_hcd *hcd)
35{
36 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
37 int retval = 0;
38
39 /* registers start at offset 0x0 */
40 ehci->caps = hcd->regs;
41 ehci->regs = hcd->regs + HC_LENGTH(ehci, ehci_readl(ehci,
42 &ehci->caps->hc_capbase));
43 /* cache this readonly data; minimize chip reads */
44 ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
45 retval = ehci_halt(ehci);
46 if (retval)
47 return retval;
48
49 retval = ehci_init(hcd);
50 if (retval)
51 return retval;
52
53 ehci_reset(ehci);
54 ehci_port_power(ehci, 0);
55
56 return retval;
57}
58
59static const struct hc_driver ehci_spear_hc_driver = {
60 .description = hcd_name,
61 .product_desc = "SPEAr EHCI",
62 .hcd_priv_size = sizeof(struct spear_ehci),
63
64 /* generic hardware linkage */
65 .irq = ehci_irq,
66 .flags = HCD_MEMORY | HCD_USB2,
67
68 /* basic lifecycle operations */
69 .reset = ehci_spear_setup,
70 .start = ehci_run,
71 .stop = ehci_stop,
72 .shutdown = ehci_shutdown,
73
74 /* managing i/o requests and associated device resources */
75 .urb_enqueue = ehci_urb_enqueue,
76 .urb_dequeue = ehci_urb_dequeue,
77 .endpoint_disable = ehci_endpoint_disable,
78 .endpoint_reset = ehci_endpoint_reset,
79
80 /* scheduling support */
81 .get_frame_number = ehci_get_frame,
82
83 /* root hub support */
84 .hub_status_data = ehci_hub_status_data,
85 .hub_control = ehci_hub_control,
86 .bus_suspend = ehci_bus_suspend,
87 .bus_resume = ehci_bus_resume,
88 .relinquish_port = ehci_relinquish_port,
89 .port_handed_over = ehci_port_handed_over,
90 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
91};
92
93static int spear_ehci_hcd_drv_probe(struct platform_device *pdev)
94{
95 struct usb_hcd *hcd ;
96 struct spear_ehci *ehci;
97 struct resource *res;
98 struct clk *usbh_clk;
99 const struct hc_driver *driver = &ehci_spear_hc_driver;
100 int *pdata = pdev->dev.platform_data;
101 int irq, retval;
102 char clk_name[20] = "usbh_clk";
103
104 if (pdata == NULL)
105 return -EFAULT;
106
107 if (usb_disabled())
108 return -ENODEV;
109
110 irq = platform_get_irq(pdev, 0);
111 if (irq < 0) {
112 retval = irq;
113 goto fail_irq_get;
114 }
115
116 if (*pdata >= 0)
117 sprintf(clk_name, "usbh.%01d_clk", *pdata);
118
119 usbh_clk = clk_get(NULL, clk_name);
120 if (IS_ERR(usbh_clk)) {
121 dev_err(&pdev->dev, "Error getting interface clock\n");
122 retval = PTR_ERR(usbh_clk);
123 goto fail_get_usbh_clk;
124 }
125
126 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
127 if (!hcd) {
128 retval = -ENOMEM;
129 goto fail_create_hcd;
130 }
131
132 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
133 if (!res) {
134 retval = -ENODEV;
135 goto fail_request_resource;
136 }
137
138 hcd->rsrc_start = res->start;
139 hcd->rsrc_len = resource_size(res);
140 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
141 driver->description)) {
142 retval = -EBUSY;
143 goto fail_request_resource;
144 }
145
146 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
147 if (hcd->regs == NULL) {
148 dev_dbg(&pdev->dev, "error mapping memory\n");
149 retval = -ENOMEM;
150 goto fail_ioremap;
151 }
152
153 ehci = (struct spear_ehci *)hcd_to_ehci(hcd);
154 ehci->clk = usbh_clk;
155
156 spear_start_ehci(ehci);
157 retval = usb_add_hcd(hcd, irq, IRQF_SHARED | IRQF_DISABLED);
158 if (retval)
159 goto fail_add_hcd;
160
161 return retval;
162
163fail_add_hcd:
164 spear_stop_ehci(ehci);
165 iounmap(hcd->regs);
166fail_ioremap:
167 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
168fail_request_resource:
169 usb_put_hcd(hcd);
170fail_create_hcd:
171 clk_put(usbh_clk);
172fail_get_usbh_clk:
173fail_irq_get:
174 dev_err(&pdev->dev, "init fail, %d\n", retval);
175
176 return retval ;
177}
178
179static int spear_ehci_hcd_drv_remove(struct platform_device *pdev)
180{
181 struct usb_hcd *hcd = platform_get_drvdata(pdev);
182 struct spear_ehci *ehci_p = to_spear_ehci(hcd);
183
184 if (!hcd)
185 return 0;
186 if (in_interrupt())
187 BUG();
188 usb_remove_hcd(hcd);
189
190 if (ehci_p->clk)
191 spear_stop_ehci(ehci_p);
192 iounmap(hcd->regs);
193 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
194 usb_put_hcd(hcd);
195
196 if (ehci_p->clk)
197 clk_put(ehci_p->clk);
198
199 return 0;
200}
201
202static struct platform_driver spear_ehci_hcd_driver = {
203 .probe = spear_ehci_hcd_drv_probe,
204 .remove = spear_ehci_hcd_drv_remove,
205 .shutdown = usb_hcd_platform_shutdown,
206 .driver = {
207 .name = "spear-ehci",
208 .bus = &platform_bus_type
209 }
210};
211
212MODULE_ALIAS("platform:spear-ehci");
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/jiffies.h>
16#include <linux/of.h>
17#include <linux/platform_device.h>
18#include <linux/pm.h>
19
20struct spear_ehci {
21 struct ehci_hcd ehci;
22 struct clk *clk;
23};
24
25#define to_spear_ehci(hcd) (struct spear_ehci *)hcd_to_ehci(hcd)
26
27static void spear_start_ehci(struct spear_ehci *ehci)
28{
29 clk_prepare_enable(ehci->clk);
30}
31
32static void spear_stop_ehci(struct spear_ehci *ehci)
33{
34 clk_disable_unprepare(ehci->clk);
35}
36
37static int ehci_spear_setup(struct usb_hcd *hcd)
38{
39 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
40 int retval = 0;
41
42 /* registers start at offset 0x0 */
43 ehci->caps = hcd->regs;
44 ehci->regs = hcd->regs + HC_LENGTH(ehci, ehci_readl(ehci,
45 &ehci->caps->hc_capbase));
46 /* cache this readonly data; minimize chip reads */
47 ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
48 retval = ehci_halt(ehci);
49 if (retval)
50 return retval;
51
52 retval = ehci_init(hcd);
53 if (retval)
54 return retval;
55
56 ehci_reset(ehci);
57 ehci_port_power(ehci, 0);
58
59 return retval;
60}
61
62static const struct hc_driver ehci_spear_hc_driver = {
63 .description = hcd_name,
64 .product_desc = "SPEAr EHCI",
65 .hcd_priv_size = sizeof(struct spear_ehci),
66
67 /* generic hardware linkage */
68 .irq = ehci_irq,
69 .flags = HCD_MEMORY | HCD_USB2,
70
71 /* basic lifecycle operations */
72 .reset = ehci_spear_setup,
73 .start = ehci_run,
74 .stop = ehci_stop,
75 .shutdown = ehci_shutdown,
76
77 /* managing i/o requests and associated device resources */
78 .urb_enqueue = ehci_urb_enqueue,
79 .urb_dequeue = ehci_urb_dequeue,
80 .endpoint_disable = ehci_endpoint_disable,
81 .endpoint_reset = ehci_endpoint_reset,
82
83 /* scheduling support */
84 .get_frame_number = ehci_get_frame,
85
86 /* root hub support */
87 .hub_status_data = ehci_hub_status_data,
88 .hub_control = ehci_hub_control,
89 .bus_suspend = ehci_bus_suspend,
90 .bus_resume = ehci_bus_resume,
91 .relinquish_port = ehci_relinquish_port,
92 .port_handed_over = ehci_port_handed_over,
93 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
94};
95
96#ifdef CONFIG_PM
97static int ehci_spear_drv_suspend(struct device *dev)
98{
99 struct usb_hcd *hcd = dev_get_drvdata(dev);
100 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
101 unsigned long flags;
102 int rc = 0;
103
104 if (time_before(jiffies, ehci->next_statechange))
105 msleep(10);
106
107 /*
108 * Root hub was already suspended. Disable irq emission and mark HW
109 * unaccessible. The PM and USB cores make sure that the root hub is
110 * either suspended or stopped.
111 */
112 spin_lock_irqsave(&ehci->lock, flags);
113 ehci_prepare_ports_for_controller_suspend(ehci, device_may_wakeup(dev));
114 ehci_writel(ehci, 0, &ehci->regs->intr_enable);
115 ehci_readl(ehci, &ehci->regs->intr_enable);
116 spin_unlock_irqrestore(&ehci->lock, flags);
117
118 return rc;
119}
120
121static int ehci_spear_drv_resume(struct device *dev)
122{
123 struct usb_hcd *hcd = dev_get_drvdata(dev);
124 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
125
126 if (time_before(jiffies, ehci->next_statechange))
127 msleep(100);
128
129 if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF) {
130 int mask = INTR_MASK;
131
132 ehci_prepare_ports_for_controller_resume(ehci);
133
134 if (!hcd->self.root_hub->do_remote_wakeup)
135 mask &= ~STS_PCD;
136
137 ehci_writel(ehci, mask, &ehci->regs->intr_enable);
138 ehci_readl(ehci, &ehci->regs->intr_enable);
139 return 0;
140 }
141
142 usb_root_hub_lost_power(hcd->self.root_hub);
143
144 /*
145 * Else reset, to cope with power loss or flush-to-storage style
146 * "resume" having let BIOS kick in during reboot.
147 */
148 ehci_halt(ehci);
149 ehci_reset(ehci);
150
151 /* emptying the schedule aborts any urbs */
152 spin_lock_irq(&ehci->lock);
153 if (ehci->reclaim)
154 end_unlink_async(ehci);
155
156 ehci_work(ehci);
157 spin_unlock_irq(&ehci->lock);
158
159 ehci_writel(ehci, ehci->command, &ehci->regs->command);
160 ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
161 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
162
163 /* here we "know" root ports should always stay powered */
164 ehci_port_power(ehci, 1);
165 return 0;
166}
167#endif /* CONFIG_PM */
168
169static SIMPLE_DEV_PM_OPS(ehci_spear_pm_ops, ehci_spear_drv_suspend,
170 ehci_spear_drv_resume);
171
172static u64 spear_ehci_dma_mask = DMA_BIT_MASK(32);
173
174static int spear_ehci_hcd_drv_probe(struct platform_device *pdev)
175{
176 struct usb_hcd *hcd ;
177 struct spear_ehci *ehci;
178 struct resource *res;
179 struct clk *usbh_clk;
180 const struct hc_driver *driver = &ehci_spear_hc_driver;
181 int irq, retval;
182 char clk_name[20] = "usbh_clk";
183 static int instance = -1;
184
185 if (usb_disabled())
186 return -ENODEV;
187
188 irq = platform_get_irq(pdev, 0);
189 if (irq < 0) {
190 retval = irq;
191 goto fail_irq_get;
192 }
193
194 /*
195 * Right now device-tree probed devices don't get dma_mask set.
196 * Since shared usb code relies on it, set it here for now.
197 * Once we have dma capability bindings this can go away.
198 */
199 if (!pdev->dev.dma_mask)
200 pdev->dev.dma_mask = &spear_ehci_dma_mask;
201
202 /*
203 * Increment the device instance, when probing via device-tree
204 */
205 if (pdev->id < 0)
206 instance++;
207 else
208 instance = pdev->id;
209 sprintf(clk_name, "usbh.%01d_clk", instance);
210
211 usbh_clk = clk_get(NULL, clk_name);
212 if (IS_ERR(usbh_clk)) {
213 dev_err(&pdev->dev, "Error getting interface clock\n");
214 retval = PTR_ERR(usbh_clk);
215 goto fail_get_usbh_clk;
216 }
217
218 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
219 if (!hcd) {
220 retval = -ENOMEM;
221 goto fail_create_hcd;
222 }
223
224 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
225 if (!res) {
226 retval = -ENODEV;
227 goto fail_request_resource;
228 }
229
230 hcd->rsrc_start = res->start;
231 hcd->rsrc_len = resource_size(res);
232 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
233 driver->description)) {
234 retval = -EBUSY;
235 goto fail_request_resource;
236 }
237
238 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
239 if (hcd->regs == NULL) {
240 dev_dbg(&pdev->dev, "error mapping memory\n");
241 retval = -ENOMEM;
242 goto fail_ioremap;
243 }
244
245 ehci = (struct spear_ehci *)hcd_to_ehci(hcd);
246 ehci->clk = usbh_clk;
247
248 spear_start_ehci(ehci);
249 retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
250 if (retval)
251 goto fail_add_hcd;
252
253 return retval;
254
255fail_add_hcd:
256 spear_stop_ehci(ehci);
257 iounmap(hcd->regs);
258fail_ioremap:
259 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
260fail_request_resource:
261 usb_put_hcd(hcd);
262fail_create_hcd:
263 clk_put(usbh_clk);
264fail_get_usbh_clk:
265fail_irq_get:
266 dev_err(&pdev->dev, "init fail, %d\n", retval);
267
268 return retval ;
269}
270
271static int spear_ehci_hcd_drv_remove(struct platform_device *pdev)
272{
273 struct usb_hcd *hcd = platform_get_drvdata(pdev);
274 struct spear_ehci *ehci_p = to_spear_ehci(hcd);
275
276 if (!hcd)
277 return 0;
278 if (in_interrupt())
279 BUG();
280 usb_remove_hcd(hcd);
281
282 if (ehci_p->clk)
283 spear_stop_ehci(ehci_p);
284 iounmap(hcd->regs);
285 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
286 usb_put_hcd(hcd);
287
288 if (ehci_p->clk)
289 clk_put(ehci_p->clk);
290
291 return 0;
292}
293
294static struct of_device_id spear_ehci_id_table[] __devinitdata = {
295 { .compatible = "st,spear600-ehci", },
296 { },
297};
298
299static struct platform_driver spear_ehci_hcd_driver = {
300 .probe = spear_ehci_hcd_drv_probe,
301 .remove = spear_ehci_hcd_drv_remove,
302 .shutdown = usb_hcd_platform_shutdown,
303 .driver = {
304 .name = "spear-ehci",
305 .bus = &platform_bus_type,
306 .pm = &ehci_spear_pm_ops,
307 .of_match_table = of_match_ptr(spear_ehci_id_table),
308 }
309};
310
311MODULE_ALIAS("platform:spear-ehci");