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[~shefty/rdma-dev.git] / drivers / usb / host / ehci-s5p.c
1 /*
2  * SAMSUNG S5P USB HOST EHCI Controller
3  *
4  * Copyright (C) 2011 Samsung Electronics Co.Ltd
5  * Author: Jingoo Han <jg1.han@samsung.com>
6  * Author: Joonyoung Shim <jy0922.shim@samsung.com>
7  *
8  * This program is free software; you can redistribute  it and/or modify it
9  * under  the terms of  the GNU General  Public License as published by the
10  * Free Software Foundation;  either version 2 of the  License, or (at your
11  * option) any later version.
12  *
13  */
14
15 #include <linux/clk.h>
16 #include <linux/platform_device.h>
17 #include <plat/ehci.h>
18 #include <plat/usb-phy.h>
19
20 struct s5p_ehci_hcd {
21         struct device *dev;
22         struct usb_hcd *hcd;
23         struct clk *clk;
24 };
25
26 static const struct hc_driver s5p_ehci_hc_driver = {
27         .description            = hcd_name,
28         .product_desc           = "S5P EHCI Host Controller",
29         .hcd_priv_size          = sizeof(struct ehci_hcd),
30
31         .irq                    = ehci_irq,
32         .flags                  = HCD_MEMORY | HCD_USB2,
33
34         .reset                  = ehci_init,
35         .start                  = ehci_run,
36         .stop                   = ehci_stop,
37         .shutdown               = ehci_shutdown,
38
39         .get_frame_number       = ehci_get_frame,
40
41         .urb_enqueue            = ehci_urb_enqueue,
42         .urb_dequeue            = ehci_urb_dequeue,
43         .endpoint_disable       = ehci_endpoint_disable,
44         .endpoint_reset         = ehci_endpoint_reset,
45
46         .hub_status_data        = ehci_hub_status_data,
47         .hub_control            = ehci_hub_control,
48         .bus_suspend            = ehci_bus_suspend,
49         .bus_resume             = ehci_bus_resume,
50
51         .relinquish_port        = ehci_relinquish_port,
52         .port_handed_over       = ehci_port_handed_over,
53
54         .clear_tt_buffer_complete       = ehci_clear_tt_buffer_complete,
55 };
56
57 static int __devinit s5p_ehci_probe(struct platform_device *pdev)
58 {
59         struct s5p_ehci_platdata *pdata;
60         struct s5p_ehci_hcd *s5p_ehci;
61         struct usb_hcd *hcd;
62         struct ehci_hcd *ehci;
63         struct resource *res;
64         int irq;
65         int err;
66
67         pdata = pdev->dev.platform_data;
68         if (!pdata) {
69                 dev_err(&pdev->dev, "No platform data defined\n");
70                 return -EINVAL;
71         }
72
73         s5p_ehci = kzalloc(sizeof(struct s5p_ehci_hcd), GFP_KERNEL);
74         if (!s5p_ehci)
75                 return -ENOMEM;
76
77         s5p_ehci->dev = &pdev->dev;
78
79         hcd = usb_create_hcd(&s5p_ehci_hc_driver, &pdev->dev,
80                                         dev_name(&pdev->dev));
81         if (!hcd) {
82                 dev_err(&pdev->dev, "Unable to create HCD\n");
83                 err = -ENOMEM;
84                 goto fail_hcd;
85         }
86
87         s5p_ehci->hcd = hcd;
88         s5p_ehci->clk = clk_get(&pdev->dev, "usbhost");
89
90         if (IS_ERR(s5p_ehci->clk)) {
91                 dev_err(&pdev->dev, "Failed to get usbhost clock\n");
92                 err = PTR_ERR(s5p_ehci->clk);
93                 goto fail_clk;
94         }
95
96         err = clk_enable(s5p_ehci->clk);
97         if (err)
98                 goto fail_clken;
99
100         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
101         if (!res) {
102                 dev_err(&pdev->dev, "Failed to get I/O memory\n");
103                 err = -ENXIO;
104                 goto fail_io;
105         }
106
107         hcd->rsrc_start = res->start;
108         hcd->rsrc_len = resource_size(res);
109         hcd->regs = ioremap(res->start, resource_size(res));
110         if (!hcd->regs) {
111                 dev_err(&pdev->dev, "Failed to remap I/O memory\n");
112                 err = -ENOMEM;
113                 goto fail_io;
114         }
115
116         irq = platform_get_irq(pdev, 0);
117         if (!irq) {
118                 dev_err(&pdev->dev, "Failed to get IRQ\n");
119                 err = -ENODEV;
120                 goto fail;
121         }
122
123         if (pdata->phy_init)
124                 pdata->phy_init(pdev, S5P_USB_PHY_HOST);
125
126         ehci = hcd_to_ehci(hcd);
127         ehci->caps = hcd->regs;
128         ehci->regs = hcd->regs +
129                 HC_LENGTH(ehci, readl(&ehci->caps->hc_capbase));
130
131         dbg_hcs_params(ehci, "reset");
132         dbg_hcc_params(ehci, "reset");
133
134         /* cache this readonly data; minimize chip reads */
135         ehci->hcs_params = readl(&ehci->caps->hcs_params);
136
137         ehci_reset(ehci);
138
139         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
140         if (err) {
141                 dev_err(&pdev->dev, "Failed to add USB HCD\n");
142                 goto fail;
143         }
144
145         platform_set_drvdata(pdev, s5p_ehci);
146
147         return 0;
148
149 fail:
150         iounmap(hcd->regs);
151 fail_io:
152         clk_disable(s5p_ehci->clk);
153 fail_clken:
154         clk_put(s5p_ehci->clk);
155 fail_clk:
156         usb_put_hcd(hcd);
157 fail_hcd:
158         kfree(s5p_ehci);
159         return err;
160 }
161
162 static int __devexit s5p_ehci_remove(struct platform_device *pdev)
163 {
164         struct s5p_ehci_platdata *pdata = pdev->dev.platform_data;
165         struct s5p_ehci_hcd *s5p_ehci = platform_get_drvdata(pdev);
166         struct usb_hcd *hcd = s5p_ehci->hcd;
167
168         usb_remove_hcd(hcd);
169
170         if (pdata && pdata->phy_exit)
171                 pdata->phy_exit(pdev, S5P_USB_PHY_HOST);
172
173         iounmap(hcd->regs);
174
175         clk_disable(s5p_ehci->clk);
176         clk_put(s5p_ehci->clk);
177
178         usb_put_hcd(hcd);
179         kfree(s5p_ehci);
180
181         return 0;
182 }
183
184 static void s5p_ehci_shutdown(struct platform_device *pdev)
185 {
186         struct s5p_ehci_hcd *s5p_ehci = platform_get_drvdata(pdev);
187         struct usb_hcd *hcd = s5p_ehci->hcd;
188
189         if (hcd->driver->shutdown)
190                 hcd->driver->shutdown(hcd);
191 }
192
193 #ifdef CONFIG_PM
194 static int s5p_ehci_suspend(struct device *dev)
195 {
196         struct s5p_ehci_hcd *s5p_ehci = dev_get_drvdata(dev);
197         struct usb_hcd *hcd = s5p_ehci->hcd;
198         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
199         struct platform_device *pdev = to_platform_device(dev);
200         struct s5p_ehci_platdata *pdata = pdev->dev.platform_data;
201         unsigned long flags;
202         int rc = 0;
203
204         if (time_before(jiffies, ehci->next_statechange))
205                 msleep(20);
206
207         /*
208          * Root hub was already suspended. Disable irq emission and
209          * mark HW unaccessible.  The PM and USB cores make sure that
210          * the root hub is either suspended or stopped.
211          */
212         ehci_prepare_ports_for_controller_suspend(ehci, device_may_wakeup(dev));
213         spin_lock_irqsave(&ehci->lock, flags);
214         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
215         (void)ehci_readl(ehci, &ehci->regs->intr_enable);
216
217         clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
218         spin_unlock_irqrestore(&ehci->lock, flags);
219
220         if (pdata && pdata->phy_exit)
221                 pdata->phy_exit(pdev, S5P_USB_PHY_HOST);
222
223         return rc;
224 }
225
226 static int s5p_ehci_resume(struct device *dev)
227 {
228         struct s5p_ehci_hcd *s5p_ehci = dev_get_drvdata(dev);
229         struct usb_hcd *hcd = s5p_ehci->hcd;
230         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
231         struct platform_device *pdev = to_platform_device(dev);
232         struct s5p_ehci_platdata *pdata = pdev->dev.platform_data;
233
234         if (pdata && pdata->phy_init)
235                 pdata->phy_init(pdev, S5P_USB_PHY_HOST);
236
237         if (time_before(jiffies, ehci->next_statechange))
238                 msleep(100);
239
240         /* Mark hardware accessible again as we are out of D3 state by now */
241         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
242
243         if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF) {
244                 int     mask = INTR_MASK;
245
246                 ehci_prepare_ports_for_controller_resume(ehci);
247                 if (!hcd->self.root_hub->do_remote_wakeup)
248                         mask &= ~STS_PCD;
249                 ehci_writel(ehci, mask, &ehci->regs->intr_enable);
250                 ehci_readl(ehci, &ehci->regs->intr_enable);
251                 return 0;
252         }
253
254         usb_root_hub_lost_power(hcd->self.root_hub);
255
256         (void) ehci_halt(ehci);
257         (void) ehci_reset(ehci);
258
259         /* emptying the schedule aborts any urbs */
260         spin_lock_irq(&ehci->lock);
261         if (ehci->reclaim)
262                 end_unlink_async(ehci);
263         ehci_work(ehci);
264         spin_unlock_irq(&ehci->lock);
265
266         ehci_writel(ehci, ehci->command, &ehci->regs->command);
267         ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
268         ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
269
270         /* here we "know" root ports should always stay powered */
271         ehci_port_power(ehci, 1);
272
273         ehci->rh_state = EHCI_RH_SUSPENDED;
274
275         return 0;
276 }
277 #else
278 #define s5p_ehci_suspend        NULL
279 #define s5p_ehci_resume         NULL
280 #endif
281
282 static const struct dev_pm_ops s5p_ehci_pm_ops = {
283         .suspend        = s5p_ehci_suspend,
284         .resume         = s5p_ehci_resume,
285 };
286
287 static struct platform_driver s5p_ehci_driver = {
288         .probe          = s5p_ehci_probe,
289         .remove         = __devexit_p(s5p_ehci_remove),
290         .shutdown       = s5p_ehci_shutdown,
291         .driver = {
292                 .name   = "s5p-ehci",
293                 .owner  = THIS_MODULE,
294                 .pm     = &s5p_ehci_pm_ops,
295         }
296 };
297
298 MODULE_ALIAS("platform:s5p-ehci");