tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
23struct ssb_ohci_device {
24 struct ohci_hcd ohci; /* _must_ be at the beginning. */
25
26 u32 enable_flags;
27};
28
29static inline
30struct ssb_ohci_device *hcd_to_ssb_ohci(struct usb_hcd *hcd)
31{
32 return (struct ssb_ohci_device *)(hcd->hcd_priv);
33}
34
35
36static 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
48static 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
63static const struct hc_driver ssb_ohci_hc_driver = {
64 .description = "ssb-usb-ohci",
65 .product_desc = "SSB OHCI Controller",
66 .hcd_priv_size = sizeof(struct ssb_ohci_device),
67
68 .irq = ohci_irq,
69 .flags = HCD_MEMORY | HCD_USB11,
70
71 .reset = ssb_ohci_reset,
72 .start = ssb_ohci_start,
73 .stop = ohci_stop,
74 .shutdown = ohci_shutdown,
75
76 .urb_enqueue = ohci_urb_enqueue,
77 .urb_dequeue = ohci_urb_dequeue,
78 .endpoint_disable = ohci_endpoint_disable,
79
80 .get_frame_number = ohci_get_frame,
81
82 .hub_status_data = ohci_hub_status_data,
83 .hub_control = ohci_hub_control,
84#ifdef CONFIG_PM
85 .bus_suspend = ohci_bus_suspend,
86 .bus_resume = ohci_bus_resume,
87#endif
88
89 .start_port_reset = ohci_start_port_reset,
90};
91
92static void ssb_ohci_detach(struct ssb_device *dev)
93{
94 struct usb_hcd *hcd = ssb_get_drvdata(dev);
95
96 usb_remove_hcd(hcd);
97 iounmap(hcd->regs);
98 usb_put_hcd(hcd);
99 ssb_device_disable(dev, 0);
100}
101
102static int ssb_ohci_attach(struct ssb_device *dev)
103{
104 struct ssb_ohci_device *ohcidev;
105 struct usb_hcd *hcd;
106 int err = -ENOMEM;
107 u32 tmp, flags = 0;
108
109 if (dev->id.coreid == SSB_DEV_USB11_HOSTDEV)
110 flags |= SSB_OHCI_TMSLOW_HOSTMODE;
111
112 ssb_device_enable(dev, flags);
113
114 hcd = usb_create_hcd(&ssb_ohci_hc_driver, dev->dev,
115 dev_name(dev->dev));
116 if (!hcd)
117 goto err_dev_disable;
118 ohcidev = hcd_to_ssb_ohci(hcd);
119 ohcidev->enable_flags = flags;
120
121 tmp = ssb_read32(dev, SSB_ADMATCH0);
122 hcd->rsrc_start = ssb_admatch_base(tmp);
123 hcd->rsrc_len = ssb_admatch_size(tmp);
124 hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
125 if (!hcd->regs)
126 goto err_put_hcd;
127 err = usb_add_hcd(hcd, dev->irq, IRQF_DISABLED | IRQF_SHARED);
128 if (err)
129 goto err_iounmap;
130
131 ssb_set_drvdata(dev, hcd);
132
133 return err;
134
135err_iounmap:
136 iounmap(hcd->regs);
137err_put_hcd:
138 usb_put_hcd(hcd);
139err_dev_disable:
140 ssb_device_disable(dev, flags);
141 return err;
142}
143
144static int ssb_ohci_probe(struct ssb_device *dev,
145 const struct ssb_device_id *id)
146{
147 int err;
148 u16 chipid_top;
149
150 /* USBcores are only connected on embedded devices. */
151 chipid_top = (dev->bus->chip_id & 0xFF00);
152 if (chipid_top != 0x4700 && chipid_top != 0x5300)
153 return -ENODEV;
154
155 /* TODO: Probably need checks here; is the core connected? */
156
157 if (usb_disabled())
158 return -ENODEV;
159
160 /* We currently always attach SSB_DEV_USB11_HOSTDEV
161 * as HOST OHCI. If we want to attach it as Client device,
162 * we must branch here and call into the (yet to
163 * be written) Client mode driver. Same for remove(). */
164
165 err = ssb_ohci_attach(dev);
166
167 return err;
168}
169
170static void ssb_ohci_remove(struct ssb_device *dev)
171{
172 ssb_ohci_detach(dev);
173}
174
175#ifdef CONFIG_PM
176
177static int ssb_ohci_suspend(struct ssb_device *dev, pm_message_t state)
178{
179 ssb_device_disable(dev, 0);
180
181 return 0;
182}
183
184static int ssb_ohci_resume(struct ssb_device *dev)
185{
186 struct usb_hcd *hcd = ssb_get_drvdata(dev);
187 struct ssb_ohci_device *ohcidev = hcd_to_ssb_ohci(hcd);
188
189 ssb_device_enable(dev, ohcidev->enable_flags);
190
191 ohci_finish_controller_resume(hcd);
192 return 0;
193}
194
195#else /* !CONFIG_PM */
196#define ssb_ohci_suspend NULL
197#define ssb_ohci_resume NULL
198#endif /* CONFIG_PM */
199
200static const struct ssb_device_id ssb_ohci_table[] = {
201 SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_USB11_HOSTDEV, SSB_ANY_REV),
202 SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_USB11_HOST, SSB_ANY_REV),
203 SSB_DEVTABLE_END
204};
205MODULE_DEVICE_TABLE(ssb, ssb_ohci_table);
206
207static struct ssb_driver ssb_ohci_driver = {
208 .name = KBUILD_MODNAME,
209 .id_table = ssb_ohci_table,
210 .probe = ssb_ohci_probe,
211 .remove = ssb_ohci_remove,
212 .suspend = ssb_ohci_suspend,
213 .resume = ssb_ohci_resume,
214};