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ohci-pnx8550.c
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1 /*
2  * OHCI HCD (Host Controller Driver) for USB.
3  *
4  * (C) Copyright 1999 Roman Weissgaerber <[email protected]>
5  * (C) Copyright 2000-2002 David Brownell <[email protected]>
6  * (C) Copyright 2002 Hewlett-Packard Company
7  * (C) Copyright 2005 Embedded Alley Solutions, Inc.
8  *
9  * Bus Glue for PNX8550
10  *
11  * Written by Christopher Hoover <[email protected]>
12  * Based on fragments of previous driver by Russell King et al.
13  *
14  * Modified for LH7A404 from ohci-sa1111.c
15  * by Durgesh Pattamatta <[email protected]>
16  *
17  * Modified for PNX8550 from ohci-sa1111.c and sa-omap.c
18  * by Vitaly Wool <[email protected]>
19  *
20  * This file is licenced under the GPL.
21  */
22 
23 #include <linux/device.h>
24 #include <linux/platform_device.h>
25 #include <asm/mach-pnx8550/usb.h>
26 #include <asm/mach-pnx8550/int.h>
27 #include <asm/mach-pnx8550/pci.h>
28 
29 #ifndef CONFIG_PNX8550
30 #error "This file is PNX8550 bus glue. CONFIG_PNX8550 must be defined."
31 #endif
32 
33 extern int usb_disabled(void);
34 
35 /*-------------------------------------------------------------------------*/
36 
37 static void pnx8550_start_hc(struct platform_device *dev)
38 {
39  /*
40  * Set register CLK48CTL to enable and 48MHz
41  */
42  outl(0x00000003, PCI_BASE | 0x0004770c);
43 
44  /*
45  * Set register CLK12CTL to enable and 48MHz
46  */
47  outl(0x00000003, PCI_BASE | 0x00047710);
48 
49  udelay(100);
50 }
51 
52 static void pnx8550_stop_hc(struct platform_device *dev)
53 {
54  udelay(10);
55 }
56 
57 
58 /*-------------------------------------------------------------------------*/
59 
60 /* configure so an HC device and id are always provided */
61 /* always called with process context; sleeping is OK */
62 
63 
73 int usb_hcd_pnx8550_probe (const struct hc_driver *driver,
74  struct platform_device *dev)
75 {
76  int retval;
77  struct usb_hcd *hcd;
78 
79  if (dev->resource[0].flags != IORESOURCE_MEM ||
80  dev->resource[1].flags != IORESOURCE_IRQ) {
81  dev_err (&dev->dev,"invalid resource type\n");
82  return -ENOMEM;
83  }
84 
85  hcd = usb_create_hcd (driver, &dev->dev, "pnx8550");
86  if (!hcd)
87  return -ENOMEM;
88  hcd->rsrc_start = dev->resource[0].start;
89  hcd->rsrc_len = dev->resource[0].end - dev->resource[0].start + 1;
90 
91  if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
92  dev_err(&dev->dev, "request_mem_region [0x%08llx, 0x%08llx] "
93  "failed\n", hcd->rsrc_start, hcd->rsrc_len);
94  retval = -EBUSY;
95  goto err1;
96  }
97 
98  hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
99  if (!hcd->regs) {
100  dev_err(&dev->dev, "ioremap [[0x%08llx, 0x%08llx] failed\n",
101  hcd->rsrc_start, hcd->rsrc_len);
102  retval = -ENOMEM;
103  goto err2;
104  }
105 
106  pnx8550_start_hc(dev);
107 
108  ohci_hcd_init(hcd_to_ohci(hcd));
109 
110  retval = usb_add_hcd(hcd, dev->resource[1].start, 0);
111  if (retval == 0)
112  return retval;
113 
114  pnx8550_stop_hc(dev);
115  iounmap(hcd->regs);
116  err2:
117  release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
118  err1:
119  usb_put_hcd(hcd);
120  return retval;
121 }
122 
123 
124 /* may be called without controller electrically present */
125 /* may be called with controller, bus, and devices active */
126 
137 void usb_hcd_pnx8550_remove (struct usb_hcd *hcd, struct platform_device *dev)
138 {
139  usb_remove_hcd(hcd);
140  pnx8550_stop_hc(dev);
141  iounmap(hcd->regs);
142  release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
143  usb_put_hcd(hcd);
144 }
145 
146 /*-------------------------------------------------------------------------*/
147 
148 static int __devinit
149 ohci_pnx8550_start (struct usb_hcd *hcd)
150 {
151  struct ohci_hcd *ohci = hcd_to_ohci (hcd);
152  int ret;
153 
154  ohci_dbg (ohci, "ohci_pnx8550_start, ohci:%p", ohci);
155 
156  if ((ret = ohci_init(ohci)) < 0)
157  return ret;
158 
159  if ((ret = ohci_run (ohci)) < 0) {
160  dev_err(hcd->self.controller, "can't start %s",
161  hcd->self.bus_name);
162  ohci_stop (hcd);
163  return ret;
164  }
165 
166  return 0;
167 }
168 
169 /*-------------------------------------------------------------------------*/
170 
171 static const struct hc_driver ohci_pnx8550_hc_driver = {
172  .description = hcd_name,
173  .product_desc = "PNX8550 OHCI",
174  .hcd_priv_size = sizeof(struct ohci_hcd),
175 
176  /*
177  * generic hardware linkage
178  */
179  .irq = ohci_irq,
180  .flags = HCD_USB11 | HCD_MEMORY,
181 
182  /*
183  * basic lifecycle operations
184  */
185  .start = ohci_pnx8550_start,
186  .stop = ohci_stop,
187 
188  /*
189  * managing i/o requests and associated device resources
190  */
191  .urb_enqueue = ohci_urb_enqueue,
192  .urb_dequeue = ohci_urb_dequeue,
193  .endpoint_disable = ohci_endpoint_disable,
194 
195  /*
196  * scheduling support
197  */
198  .get_frame_number = ohci_get_frame,
199 
200  /*
201  * root hub support
202  */
203  .hub_status_data = ohci_hub_status_data,
204  .hub_control = ohci_hub_control,
205 #ifdef CONFIG_PM
206  .bus_suspend = ohci_bus_suspend,
207  .bus_resume = ohci_bus_resume,
208 #endif
209  .start_port_reset = ohci_start_port_reset,
210 };
211 
212 /*-------------------------------------------------------------------------*/
213 
214 static int ohci_hcd_pnx8550_drv_probe(struct platform_device *pdev)
215 {
216  int ret;
217 
218  if (usb_disabled())
219  return -ENODEV;
220 
221  ret = usb_hcd_pnx8550_probe(&ohci_pnx8550_hc_driver, pdev);
222  return ret;
223 }
224 
225 static int ohci_hcd_pnx8550_drv_remove(struct platform_device *pdev)
226 {
227  struct usb_hcd *hcd = platform_get_drvdata(pdev);
228 
229  usb_hcd_pnx8550_remove(hcd, pdev);
230  return 0;
231 }
232 
233 MODULE_ALIAS("platform:pnx8550-ohci");
234 
235 static struct platform_driver ohci_hcd_pnx8550_driver = {
236  .driver = {
237  .name = "pnx8550-ohci",
238  .owner = THIS_MODULE,
239  },
240  .probe = ohci_hcd_pnx8550_drv_probe,
241  .remove = ohci_hcd_pnx8550_drv_remove,
242 };
243