1 /*
2 * OHCI HCD (Host Controller Driver) for USB.
3 *
4 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
5 * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
6 * (C) Copyright 2002 Hewlett-Packard Company
7 *
8 * Bus Glue for AMD Alchemy Au1xxx
9 *
10 * Written by Christopher Hoover <ch@hpl.hp.com>
11 * Based on fragments of previous driver by Russell King et al.
12 *
13 * Modified for LH7A404 from ohci-sa1111.c
14 * by Durgesh Pattamatta <pattamattad@sharpsec.com>
15 * Modified for AMD Alchemy Au1xxx
16 * by Matt Porter <mporter@kernel.crashing.org>
17 *
18 * This file is licenced under the GPL.
19 */
20
21 #include <linux/platform_device.h>
22 #include <linux/signal.h>
23
24 #include <asm/mach-au1x00/au1000.h>
25
26 #ifndef CONFIG_SOC_AU1200
27
28 #define USBH_ENABLE_BE (1<<0)
29 #define USBH_ENABLE_C (1<<1)
30 #define USBH_ENABLE_E (1<<2)
31 #define USBH_ENABLE_CE (1<<3)
32 #define USBH_ENABLE_RD (1<<4)
33
34 #ifdef __LITTLE_ENDIAN
35 #define USBH_ENABLE_INIT (USBH_ENABLE_CE | USBH_ENABLE_E | USBH_ENABLE_C)
36 #elif defined(__BIG_ENDIAN)
37 #define USBH_ENABLE_INIT (USBH_ENABLE_CE | USBH_ENABLE_E | USBH_ENABLE_C | \
38 USBH_ENABLE_BE)
39 #else
40 #error not byte order defined
41 #endif
42
43 #else /* Au1200 */
44
45 #define USB_HOST_CONFIG (USB_MSR_BASE + USB_MSR_MCFG)
46 #define USB_MCFG_PFEN (1<<31)
47 #define USB_MCFG_RDCOMB (1<<30)
48 #define USB_MCFG_SSDEN (1<<23)
49 #define USB_MCFG_OHCCLKEN (1<<16)
50 #ifdef CONFIG_DMA_COHERENT
51 #define USB_MCFG_UCAM (1<<7)
52 #else
53 #define USB_MCFG_UCAM (0)
54 #endif
55 #define USB_MCFG_OBMEN (1<<1)
56 #define USB_MCFG_OMEMEN (1<<0)
57
58 #define USBH_ENABLE_CE USB_MCFG_OHCCLKEN
59
60 #define USBH_ENABLE_INIT (USB_MCFG_PFEN | USB_MCFG_RDCOMB | \
61 USBH_ENABLE_CE | USB_MCFG_SSDEN | \
62 USB_MCFG_UCAM | \
63 USB_MCFG_OBMEN | USB_MCFG_OMEMEN)
64
65 #define USBH_DISABLE (USB_MCFG_OBMEN | USB_MCFG_OMEMEN)
66
67 #endif /* Au1200 */
68
69 extern int usb_disabled(void);
70
au1xxx_start_ohc(void)71 static void au1xxx_start_ohc(void)
72 {
73 /* enable host controller */
74 #ifndef CONFIG_SOC_AU1200
75 au_writel(USBH_ENABLE_CE, USB_HOST_CONFIG);
76 au_sync();
77 udelay(1000);
78
79 au_writel(au_readl(USB_HOST_CONFIG) | USBH_ENABLE_INIT, USB_HOST_CONFIG);
80 au_sync();
81 udelay(1000);
82
83 /* wait for reset complete (read register twice; see au1500 errata) */
84 while (au_readl(USB_HOST_CONFIG),
85 !(au_readl(USB_HOST_CONFIG) & USBH_ENABLE_RD))
86 udelay(1000);
87
88 #else /* Au1200 */
89 au_writel(au_readl(USB_HOST_CONFIG) | USBH_ENABLE_CE, USB_HOST_CONFIG);
90 au_sync();
91 udelay(1000);
92
93 au_writel(au_readl(USB_HOST_CONFIG) | USBH_ENABLE_INIT, USB_HOST_CONFIG);
94 au_sync();
95 udelay(2000);
96 #endif /* Au1200 */
97 }
98
au1xxx_stop_ohc(void)99 static void au1xxx_stop_ohc(void)
100 {
101 #ifdef CONFIG_SOC_AU1200
102 /* Disable mem */
103 au_writel(au_readl(USB_HOST_CONFIG) & ~USBH_DISABLE, USB_HOST_CONFIG);
104 au_sync();
105 udelay(1000);
106 #endif
107 /* Disable clock */
108 au_writel(au_readl(USB_HOST_CONFIG) & ~USBH_ENABLE_CE, USB_HOST_CONFIG);
109 au_sync();
110 }
111
ohci_au1xxx_start(struct usb_hcd * hcd)112 static int __devinit ohci_au1xxx_start(struct usb_hcd *hcd)
113 {
114 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
115 int ret;
116
117 ohci_dbg(ohci, "ohci_au1xxx_start, ohci:%p", ohci);
118
119 if ((ret = ohci_init(ohci)) < 0)
120 return ret;
121
122 if ((ret = ohci_run(ohci)) < 0) {
123 err ("can't start %s", hcd->self.bus_name);
124 ohci_stop(hcd);
125 return ret;
126 }
127
128 return 0;
129 }
130
131 static const struct hc_driver ohci_au1xxx_hc_driver = {
132 .description = hcd_name,
133 .product_desc = "Au1xxx OHCI",
134 .hcd_priv_size = sizeof(struct ohci_hcd),
135
136 /*
137 * generic hardware linkage
138 */
139 .irq = ohci_irq,
140 .flags = HCD_USB11 | HCD_MEMORY,
141
142 /*
143 * basic lifecycle operations
144 */
145 .start = ohci_au1xxx_start,
146 .stop = ohci_stop,
147 .shutdown = ohci_shutdown,
148
149 /*
150 * managing i/o requests and associated device resources
151 */
152 .urb_enqueue = ohci_urb_enqueue,
153 .urb_dequeue = ohci_urb_dequeue,
154 .endpoint_disable = ohci_endpoint_disable,
155
156 /*
157 * scheduling support
158 */
159 .get_frame_number = ohci_get_frame,
160
161 /*
162 * root hub support
163 */
164 .hub_status_data = ohci_hub_status_data,
165 .hub_control = ohci_hub_control,
166 #ifdef CONFIG_PM
167 .bus_suspend = ohci_bus_suspend,
168 .bus_resume = ohci_bus_resume,
169 #endif
170 .start_port_reset = ohci_start_port_reset,
171 };
172
ohci_hcd_au1xxx_drv_probe(struct platform_device * pdev)173 static int ohci_hcd_au1xxx_drv_probe(struct platform_device *pdev)
174 {
175 int ret;
176 struct usb_hcd *hcd;
177
178 if (usb_disabled())
179 return -ENODEV;
180
181 #if defined(CONFIG_SOC_AU1200) && defined(CONFIG_DMA_COHERENT)
182 /* Au1200 AB USB does not support coherent memory */
183 if (!(read_c0_prid() & 0xff)) {
184 printk(KERN_INFO "%s: this is chip revision AB !!\n",
185 pdev->name);
186 printk(KERN_INFO "%s: update your board or re-configure "
187 "the kernel\n", pdev->name);
188 return -ENODEV;
189 }
190 #endif
191
192 if (pdev->resource[1].flags != IORESOURCE_IRQ) {
193 pr_debug("resource[1] is not IORESOURCE_IRQ\n");
194 return -ENOMEM;
195 }
196
197 hcd = usb_create_hcd(&ohci_au1xxx_hc_driver, &pdev->dev, "au1xxx");
198 if (!hcd)
199 return -ENOMEM;
200
201 hcd->rsrc_start = pdev->resource[0].start;
202 hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
203
204 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
205 pr_debug("request_mem_region failed\n");
206 ret = -EBUSY;
207 goto err1;
208 }
209
210 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
211 if (!hcd->regs) {
212 pr_debug("ioremap failed\n");
213 ret = -ENOMEM;
214 goto err2;
215 }
216
217 au1xxx_start_ohc();
218 ohci_hcd_init(hcd_to_ohci(hcd));
219
220 ret = usb_add_hcd(hcd, pdev->resource[1].start,
221 IRQF_DISABLED | IRQF_SHARED);
222 if (ret == 0) {
223 platform_set_drvdata(pdev, hcd);
224 return ret;
225 }
226
227 au1xxx_stop_ohc();
228 iounmap(hcd->regs);
229 err2:
230 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
231 err1:
232 usb_put_hcd(hcd);
233 return ret;
234 }
235
ohci_hcd_au1xxx_drv_remove(struct platform_device * pdev)236 static int ohci_hcd_au1xxx_drv_remove(struct platform_device *pdev)
237 {
238 struct usb_hcd *hcd = platform_get_drvdata(pdev);
239
240 usb_remove_hcd(hcd);
241 au1xxx_stop_ohc();
242 iounmap(hcd->regs);
243 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
244 usb_put_hcd(hcd);
245 platform_set_drvdata(pdev, NULL);
246
247 return 0;
248 }
249
250 #ifdef CONFIG_PM
ohci_hcd_au1xxx_drv_suspend(struct device * dev)251 static int ohci_hcd_au1xxx_drv_suspend(struct device *dev)
252 {
253 struct usb_hcd *hcd = dev_get_drvdata(dev);
254 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
255 unsigned long flags;
256 int rc;
257
258 rc = 0;
259
260 /* Root hub was already suspended. Disable irq emission and
261 * mark HW unaccessible, bail out if RH has been resumed. Use
262 * the spinlock to properly synchronize with possible pending
263 * RH suspend or resume activity.
264 *
265 * This is still racy as hcd->state is manipulated outside of
266 * any locks =P But that will be a different fix.
267 */
268 spin_lock_irqsave(&ohci->lock, flags);
269 if (hcd->state != HC_STATE_SUSPENDED) {
270 rc = -EINVAL;
271 goto bail;
272 }
273 ohci_writel(ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
274 (void)ohci_readl(ohci, &ohci->regs->intrdisable);
275
276 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
277
278 au1xxx_stop_ohc();
279 bail:
280 spin_unlock_irqrestore(&ohci->lock, flags);
281
282 return rc;
283 }
284
ohci_hcd_au1xxx_drv_resume(struct device * dev)285 static int ohci_hcd_au1xxx_drv_resume(struct device *dev)
286 {
287 struct usb_hcd *hcd = dev_get_drvdata(dev);
288
289 au1xxx_start_ohc();
290
291 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
292 ohci_finish_controller_resume(hcd);
293
294 return 0;
295 }
296
297 static const struct dev_pm_ops au1xxx_ohci_pmops = {
298 .suspend = ohci_hcd_au1xxx_drv_suspend,
299 .resume = ohci_hcd_au1xxx_drv_resume,
300 };
301
302 #define AU1XXX_OHCI_PMOPS &au1xxx_ohci_pmops
303
304 #else
305 #define AU1XXX_OHCI_PMOPS NULL
306 #endif
307
308 static struct platform_driver ohci_hcd_au1xxx_driver = {
309 .probe = ohci_hcd_au1xxx_drv_probe,
310 .remove = ohci_hcd_au1xxx_drv_remove,
311 .shutdown = usb_hcd_platform_shutdown,
312 .driver = {
313 .name = "au1xxx-ohci",
314 .owner = THIS_MODULE,
315 .pm = AU1XXX_OHCI_PMOPS,
316 },
317 };
318
319 MODULE_ALIAS("platform:au1xxx-ohci");
320