Merge git://git.kernel.org/pub/scm/linux/kernel/git/wim/linux-2.6-watchdog
[linux-2.6] / drivers / usb / host / ohci-ssb.c
1 /*
2  * Sonics Silicon Backplane
3  * Broadcom USB-core OHCI driver
4  *
5  * Copyright 2007 Michael Buesch <mb@bu3sch.de>
6  *
7  * Derived from the OHCI-PCI driver
8  * Copyright 1999 Roman Weissgaerber
9  * Copyright 2000-2002 David Brownell
10  * Copyright 1999 Linus Torvalds
11  * Copyright 1999 Gregory P. Smith
12  *
13  * Derived from the USBcore related parts of Broadcom-SB
14  * Copyright 2005 Broadcom Corporation
15  *
16  * Licensed under the GNU/GPL. See COPYING for details.
17  */
18 #include <linux/ssb/ssb.h>
19
20
21 #define SSB_OHCI_TMSLOW_HOSTMODE        (1 << 29)
22
23 struct ssb_ohci_device {
24         struct ohci_hcd ohci; /* _must_ be at the beginning. */
25
26         u32 enable_flags;
27 };
28
29 static inline
30 struct ssb_ohci_device *hcd_to_ssb_ohci(struct usb_hcd *hcd)
31 {
32         return (struct ssb_ohci_device *)(hcd->hcd_priv);
33 }
34
35
36 static int ssb_ohci_reset(struct usb_hcd *hcd)
37 {
38         struct ssb_ohci_device *ohcidev = hcd_to_ssb_ohci(hcd);
39         struct ohci_hcd *ohci = &ohcidev->ohci;
40         int err;
41
42         ohci_hcd_init(ohci);
43         err = ohci_init(ohci);
44
45         return err;
46 }
47
48 static int ssb_ohci_start(struct usb_hcd *hcd)
49 {
50         struct ssb_ohci_device *ohcidev = hcd_to_ssb_ohci(hcd);
51         struct ohci_hcd *ohci = &ohcidev->ohci;
52         int err;
53
54         err = ohci_run(ohci);
55         if (err < 0) {
56                 ohci_err(ohci, "can't start\n");
57                 ohci_stop(hcd);
58         }
59
60         return err;
61 }
62
63 #ifdef CONFIG_PM
64 static int ssb_ohci_hcd_suspend(struct usb_hcd *hcd, pm_message_t message)
65 {
66         struct ssb_ohci_device *ohcidev = hcd_to_ssb_ohci(hcd);
67         struct ohci_hcd *ohci = &ohcidev->ohci;
68         unsigned long flags;
69
70         spin_lock_irqsave(&ohci->lock, flags);
71
72         ohci_writel(ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
73         ohci_readl(ohci, &ohci->regs->intrdisable); /* commit write */
74
75         /* make sure snapshot being resumed re-enumerates everything */
76         if (message.event == PM_EVENT_PRETHAW)
77                 ohci_usb_reset(ohci);
78
79         clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
80
81         spin_unlock_irqrestore(&ohci->lock, flags);
82         return 0;
83 }
84
85 static int ssb_ohci_hcd_resume(struct usb_hcd *hcd)
86 {
87         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
88         usb_hcd_resume_root_hub(hcd);
89         return 0;
90 }
91 #endif /* CONFIG_PM */
92
93 static const struct hc_driver ssb_ohci_hc_driver = {
94         .description            = "ssb-usb-ohci",
95         .product_desc           = "SSB OHCI Controller",
96         .hcd_priv_size          = sizeof(struct ssb_ohci_device),
97
98         .irq                    = ohci_irq,
99         .flags                  = HCD_MEMORY | HCD_USB11,
100
101         .reset                  = ssb_ohci_reset,
102         .start                  = ssb_ohci_start,
103         .stop                   = ohci_stop,
104         .shutdown               = ohci_shutdown,
105
106 #ifdef CONFIG_PM
107         .suspend                = ssb_ohci_hcd_suspend,
108         .resume                 = ssb_ohci_hcd_resume,
109 #endif
110
111         .urb_enqueue            = ohci_urb_enqueue,
112         .urb_dequeue            = ohci_urb_dequeue,
113         .endpoint_disable       = ohci_endpoint_disable,
114
115         .get_frame_number       = ohci_get_frame,
116
117         .hub_status_data        = ohci_hub_status_data,
118         .hub_control            = ohci_hub_control,
119         .hub_irq_enable         = ohci_rhsc_enable,
120 #ifdef  CONFIG_PM
121         .bus_suspend            = ohci_bus_suspend,
122         .bus_resume             = ohci_bus_resume,
123 #endif
124
125         .start_port_reset       = ohci_start_port_reset,
126 };
127
128 static void ssb_ohci_detach(struct ssb_device *dev)
129 {
130         struct usb_hcd *hcd = ssb_get_drvdata(dev);
131
132         usb_remove_hcd(hcd);
133         iounmap(hcd->regs);
134         usb_put_hcd(hcd);
135         ssb_device_disable(dev, 0);
136 }
137
138 static int ssb_ohci_attach(struct ssb_device *dev)
139 {
140         struct ssb_ohci_device *ohcidev;
141         struct usb_hcd *hcd;
142         int err = -ENOMEM;
143         u32 tmp, flags = 0;
144
145         if (dev->id.coreid == SSB_DEV_USB11_HOSTDEV)
146                 flags |= SSB_OHCI_TMSLOW_HOSTMODE;
147
148         ssb_device_enable(dev, flags);
149
150         hcd = usb_create_hcd(&ssb_ohci_hc_driver, dev->dev,
151                         dev->dev->bus_id);
152         if (!hcd)
153                 goto err_dev_disable;
154         ohcidev = hcd_to_ssb_ohci(hcd);
155         ohcidev->enable_flags = flags;
156
157         tmp = ssb_read32(dev, SSB_ADMATCH0);
158         hcd->rsrc_start = ssb_admatch_base(tmp);
159         hcd->rsrc_len = ssb_admatch_size(tmp);
160         hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
161         if (!hcd->regs)
162                 goto err_put_hcd;
163         err = usb_add_hcd(hcd, dev->irq, IRQF_SHARED);
164         if (err)
165                 goto err_iounmap;
166
167         ssb_set_drvdata(dev, hcd);
168
169         return err;
170
171 err_iounmap:
172         iounmap(hcd->regs);
173 err_put_hcd:
174         usb_put_hcd(hcd);
175 err_dev_disable:
176         ssb_device_disable(dev, flags);
177         return err;
178 }
179
180 static int ssb_ohci_probe(struct ssb_device *dev,
181                 const struct ssb_device_id *id)
182 {
183         int err;
184         u16 chipid_top;
185
186         /* USBcores are only connected on embedded devices. */
187         chipid_top = (dev->bus->chip_id & 0xFF00);
188         if (chipid_top != 0x4700 && chipid_top != 0x5300)
189                 return -ENODEV;
190
191         /* TODO: Probably need checks here; is the core connected? */
192
193         if (usb_disabled())
194                 return -ENODEV;
195
196         /* We currently always attach SSB_DEV_USB11_HOSTDEV
197          * as HOST OHCI. If we want to attach it as Client device,
198          * we must branch here and call into the (yet to
199          * be written) Client mode driver. Same for remove(). */
200
201         err = ssb_ohci_attach(dev);
202
203         return err;
204 }
205
206 static void ssb_ohci_remove(struct ssb_device *dev)
207 {
208         ssb_ohci_detach(dev);
209 }
210
211 #ifdef CONFIG_PM
212
213 static int ssb_ohci_suspend(struct ssb_device *dev, pm_message_t state)
214 {
215         ssb_device_disable(dev, 0);
216
217         return 0;
218 }
219
220 static int ssb_ohci_resume(struct ssb_device *dev)
221 {
222         struct usb_hcd *hcd = ssb_get_drvdata(dev);
223         struct ssb_ohci_device *ohcidev = hcd_to_ssb_ohci(hcd);
224
225         ssb_device_enable(dev, ohcidev->enable_flags);
226
227         return 0;
228 }
229
230 #else /* !CONFIG_PM */
231 #define ssb_ohci_suspend        NULL
232 #define ssb_ohci_resume NULL
233 #endif /* CONFIG_PM */
234
235 static const struct ssb_device_id ssb_ohci_table[] = {
236         SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_USB11_HOSTDEV, SSB_ANY_REV),
237         SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_USB11_HOST, SSB_ANY_REV),
238         SSB_DEVTABLE_END
239 };
240 MODULE_DEVICE_TABLE(ssb, ssb_ohci_table);
241
242 static struct ssb_driver ssb_ohci_driver = {
243         .name           = KBUILD_MODNAME,
244         .id_table       = ssb_ohci_table,
245         .probe          = ssb_ohci_probe,
246         .remove         = ssb_ohci_remove,
247         .suspend        = ssb_ohci_suspend,
248         .resume         = ssb_ohci_resume,
249 };