Fix ohci-ssb with !CONFIG_PM
[linux-2.6] / drivers / usb / host / ehci-ppc-soc.c
1 /*
2  * EHCI HCD (Host Controller Driver) for USB.
3  *
4  * (C) Copyright 2006-2007 Stefan Roese <sr@denx.de>, DENX Software Engineering
5  *
6  * Bus Glue for PPC On-Chip EHCI driver
7  * Tested on AMCC 440EPx
8  *
9  * Based on "ehci-au1xxx.c" by K.Boge <karsten.boge@amd.com>
10  *
11  * This file is licenced under the GPL.
12  */
13
14 #include <linux/platform_device.h>
15
16 extern int usb_disabled(void);
17
18 /* called during probe() after chip reset completes */
19 static int ehci_ppc_soc_setup(struct usb_hcd *hcd)
20 {
21         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
22         int             retval;
23
24         retval = ehci_halt(ehci);
25         if (retval)
26                 return retval;
27
28         retval = ehci_init(hcd);
29         if (retval)
30                 return retval;
31
32         ehci->sbrn = 0x20;
33         return ehci_reset(ehci);
34 }
35
36 /**
37  * usb_ehci_ppc_soc_probe - initialize PPC-SoC-based HCDs
38  * Context: !in_interrupt()
39  *
40  * Allocates basic resources for this USB host controller, and
41  * then invokes the start() method for the HCD associated with it
42  * through the hotplug entry's driver_data.
43  *
44  */
45 int usb_ehci_ppc_soc_probe(const struct hc_driver *driver,
46                            struct usb_hcd **hcd_out,
47                            struct platform_device *dev)
48 {
49         int retval;
50         struct usb_hcd *hcd;
51         struct ehci_hcd *ehci;
52
53         if (dev->resource[1].flags != IORESOURCE_IRQ) {
54                 pr_debug("resource[1] is not IORESOURCE_IRQ");
55                 retval = -ENOMEM;
56         }
57         hcd = usb_create_hcd(driver, &dev->dev, "PPC-SOC EHCI");
58         if (!hcd)
59                 return -ENOMEM;
60         hcd->rsrc_start = dev->resource[0].start;
61         hcd->rsrc_len = dev->resource[0].end - dev->resource[0].start + 1;
62
63         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
64                 pr_debug("request_mem_region failed");
65                 retval = -EBUSY;
66                 goto err1;
67         }
68
69         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
70         if (!hcd->regs) {
71                 pr_debug("ioremap failed");
72                 retval = -ENOMEM;
73                 goto err2;
74         }
75
76         ehci = hcd_to_ehci(hcd);
77         ehci->big_endian_mmio = 1;
78         ehci->big_endian_desc = 1;
79         ehci->caps = hcd->regs;
80         ehci->regs = hcd->regs + HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
81
82         /* cache this readonly data; minimize chip reads */
83         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
84
85 #if defined(CONFIG_440EPX)
86         /*
87          * 440EPx Errata USBH_3
88          * Fix: Enable Break Memory Transfer (BMT) in INSNREG3
89          */
90         out_be32((void *)((ulong)(&ehci->regs->command) + 0x8c), (1 << 0));
91         ehci_dbg(ehci, "Break Memory Transfer (BMT) has beed enabled!\n");
92 #endif
93
94         retval = usb_add_hcd(hcd, dev->resource[1].start, IRQF_DISABLED);
95         if (retval == 0)
96                 return retval;
97
98         iounmap(hcd->regs);
99 err2:
100         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
101 err1:
102         usb_put_hcd(hcd);
103         return retval;
104 }
105
106 /* may be called without controller electrically present */
107 /* may be called with controller, bus, and devices active */
108
109 /**
110  * usb_ehci_hcd_ppc_soc_remove - shutdown processing for PPC-SoC-based HCDs
111  * @dev: USB Host Controller being removed
112  * Context: !in_interrupt()
113  *
114  * Reverses the effect of usb_ehci_hcd_ppc_soc_probe(), first invoking
115  * the HCD's stop() method.  It is always called from a thread
116  * context, normally "rmmod", "apmd", or something similar.
117  *
118  */
119 void usb_ehci_ppc_soc_remove(struct usb_hcd *hcd, struct platform_device *dev)
120 {
121         usb_remove_hcd(hcd);
122         iounmap(hcd->regs);
123         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
124         usb_put_hcd(hcd);
125 }
126
127 static const struct hc_driver ehci_ppc_soc_hc_driver = {
128         .description = hcd_name,
129         .product_desc = "PPC-SOC EHCI",
130         .hcd_priv_size = sizeof(struct ehci_hcd),
131
132         /*
133          * generic hardware linkage
134          */
135         .irq = ehci_irq,
136         .flags = HCD_MEMORY | HCD_USB2,
137
138         /*
139          * basic lifecycle operations
140          */
141         .reset = ehci_ppc_soc_setup,
142         .start = ehci_run,
143         .stop = ehci_stop,
144         .shutdown = ehci_shutdown,
145
146         /*
147          * managing i/o requests and associated device resources
148          */
149         .urb_enqueue = ehci_urb_enqueue,
150         .urb_dequeue = ehci_urb_dequeue,
151         .endpoint_disable = ehci_endpoint_disable,
152
153         /*
154          * scheduling support
155          */
156         .get_frame_number = ehci_get_frame,
157
158         /*
159          * root hub support
160          */
161         .hub_status_data = ehci_hub_status_data,
162         .hub_control = ehci_hub_control,
163         .bus_suspend = ehci_bus_suspend,
164         .bus_resume = ehci_bus_resume,
165 };
166
167 static int ehci_hcd_ppc_soc_drv_probe(struct platform_device *pdev)
168 {
169         struct usb_hcd *hcd = NULL;
170         int ret;
171
172         pr_debug("In ehci_hcd_ppc_soc_drv_probe\n");
173
174         if (usb_disabled())
175                 return -ENODEV;
176
177         ret = usb_ehci_ppc_soc_probe(&ehci_ppc_soc_hc_driver, &hcd, pdev);
178         return ret;
179 }
180
181 static int ehci_hcd_ppc_soc_drv_remove(struct platform_device *pdev)
182 {
183         struct usb_hcd *hcd = platform_get_drvdata(pdev);
184
185         usb_ehci_ppc_soc_remove(hcd, pdev);
186         return 0;
187 }
188
189 MODULE_ALIAS("ppc-soc-ehci");
190 static struct platform_driver ehci_ppc_soc_driver = {
191         .probe = ehci_hcd_ppc_soc_drv_probe,
192         .remove = ehci_hcd_ppc_soc_drv_remove,
193         .shutdown = usb_hcd_platform_shutdown,
194         .driver = {
195                 .name = "ppc-soc-ehci",
196                 .bus = &platform_bus_type
197         }
198 };