arch/tile/include/gxio/usb_host.h

   1 /*
   2  * Copyright 2012 Tilera Corporation. All Rights Reserved.
   3  *
   4  *   This program is free software; you can redistribute it and/or
   5  *   modify it under the terms of the GNU General Public License
   6  *   as published by the Free Software Foundation, version 2.
   7  *
   8  *   This program is distributed in the hope that it will be useful, but
   9  *   WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  11  *   NON INFRINGEMENT.  See the GNU General Public License for
  12  *   more details.
  13  */
  14 #ifndef _GXIO_USB_H_
  15 #define _GXIO_USB_H_
  16
  17 #include <gxio/common.h>
  18
  19 #include <hv/drv_usb_host_intf.h>
  20 #include <hv/iorpc.h>
  21
  22 /*
  23  *
  24  * An API for manipulating general-purpose I/O pins.
  25  */
  26
  27 /*
  28  *
  29  * The USB shim allows access to the processor's Universal Serial Bus
  30  * connections.
  31  */
  32
  33 /* A context object used to manage USB hardware resources. */
  34 typedef struct {
  35
  36         /* File descriptor for calling up to the hypervisor. */
  37         int fd;
  38
  39         /* The VA at which our MMIO registers are mapped. */
  40         char *mmio_base;
  41 } gxio_usb_host_context_t;
  42
  43 /* Initialize a USB context.
  44  *
  45  *  A properly initialized context must be obtained before any of the other
  46  *  gxio_usb_host routines may be used.
  47  *
  48  * @param context Pointer to a gxio_usb_host_context_t, which will be
  49  *  initialized by this routine, if it succeeds.
  50  * @param usb_index Index of the USB shim to use.
  51  * @param is_ehci Nonzero to use the EHCI interface; zero to use the OHCI
  52  *  intereface.
  53  * @return Zero if the context was successfully initialized, else a
  54  *  GXIO_ERR_xxx error code.
  55  */
  56 extern int gxio_usb_host_init(gxio_usb_host_context_t *context, int usb_index,
  57                               int is_ehci);
  58
  59 /* Destroy a USB context.
  60  *
  61  *  Once destroyed, a context may not be used with any gxio_usb_host routines
  62  *  other than gxio_usb_host_init().  After this routine returns, no further
  63  *  interrupts or signals requested on this context will be delivered.  The
  64  *  state and configuration of the pins which had been attached to this
  65  *  context are unchanged by this operation.
  66  *
  67  * @param context Pointer to a gxio_usb_host_context_t.
  68  * @return Zero if the context was successfully destroyed, else a
  69  *  GXIO_ERR_xxx error code.
  70  */
  71 extern int gxio_usb_host_destroy(gxio_usb_host_context_t *context);
  72
  73 /* Retrieve the address of the shim's MMIO registers.
  74  *
  75  * @param context Pointer to a properly initialized gxio_usb_host_context_t.
  76  * @return The address of the shim's MMIO registers.
  77  */
  78 extern void *gxio_usb_host_get_reg_start(gxio_usb_host_context_t *context);
  79
  80 /* Retrieve the length of the shim's MMIO registers.
  81  *
  82  * @param context Pointer to a properly initialized gxio_usb_host_context_t.
  83  * @return The length of the shim's MMIO registers.
  84  */
  85 extern size_t gxio_usb_host_get_reg_len(gxio_usb_host_context_t *context);
  86
  87 #endif /* _GXIO_USB_H_ */