firmware/target/arm/imx31/gigabeat-s/usb-imx31.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2006 by Linus Nielsen Feltzing
  11  *
  12  * All files in this archive are subject to the GNU General Public License.
  13  * See the file COPYING in the source tree root for full license agreement.
  14  *
  15  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  16  * KIND, either express or implied.
  17  *
  18  ****************************************************************************/
  19 #include "config.h"
  20 #include "cpu.h"
  21 #include "system.h"
  22 #include "kernel.h"
  23 #include "ata.h"
  24 #include "usb.h"
  25 #include "usb_core.h"
  26 #include "clkctl-imx31.h"
  27 #include "mc13783.h"
  28
  29 static int usb_status = USB_EXTRACTED;
  30
  31 static void enable_transceiver(bool enable)
  32 {
  33     if (enable)
  34     {
  35         if (GPIO1_DR & (1 << 30))
  36         {
  37             GPIO3_DR &= ~(1 << 16); /* Reset ISP1504 */
  38             GPIO3_DR |= (1 << 16);
  39             GPIO1_DR &= ~(1 << 30); /* Select ISP1504 */
  40         }
  41     }
  42     else
  43     {
  44         GPIO1_DR |= (1 << 30); /* Deselect ISP1504 */
  45     }
  46 }
  47
  48 void usb_set_status(bool plugged)
  49 {
  50     usb_status = plugged ? USB_INSERTED : USB_EXTRACTED;
  51 }
  52
  53 int usb_detect(void)
  54 {
  55     return usb_status;
  56 }
  57
  58 /* Read the immediate state of the cable from the PMIC */
  59 bool usb_plugged(void)
  60 {
  61     return mc13783_read(MC13783_INTERRUPT_SENSE0) & MC13783_USB4V4;
  62 }
  63
  64 extern void usb_drv_startup(void);
  65
  66 void usb_init_device(void)
  67 {
  68     imx31_clkctl_module_clock_gating(CG_USBOTG, CGM_ON_ALL);
  69
  70     enable_transceiver(true);
  71
  72     /* Module will be turned off later after firmware init */
  73     usb_drv_startup();
  74
  75     mc13783_clear(MC13783_INTERRUPT_MASK0, MC13783_USB4V4);
  76 }
  77
  78 void usb_enable(bool on)
  79 {
  80     if (on)
  81     {
  82         imx31_clkctl_module_clock_gating(CG_USBOTG, CGM_ON_ALL);
  83         enable_transceiver(true);
  84         usb_core_init();
  85     }
  86     else
  87     {
  88         /* Module clock should be on since this could be called first */
  89         imx31_clkctl_module_clock_gating(CG_USBOTG, CGM_ON_ALL);
  90         enable_transceiver(true);
  91         usb_core_exit();
  92         enable_transceiver(false);
  93         imx31_clkctl_module_clock_gating(CG_USBOTG, CGM_OFF);
  94     }
  95 }