cpu/arm920t/s3c24x0/usb.c

   1 /*
   2  * (C) Copyright 2006
   3  * DENX Software Engineering <mk@denx.de>
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 #include <common.h>
  25
  26 #if defined(CONFIG_USB_OHCI_NEW) && defined(CONFIG_SYS_USB_OHCI_CPU_INIT)
  27 # if defined(CONFIG_S3C2400) || defined(CONFIG_S3C2410)
  28
  29 #if defined(CONFIG_S3C2400)
  30 # include <s3c2400.h>
  31 #elif defined(CONFIG_S3C2410)
  32 # include <s3c2410.h>
  33 #endif
  34
  35 int usb_cpu_init (void)
  36 {
  37
  38         S3C24X0_CLOCK_POWER * const clk_power = S3C24X0_GetBase_CLOCK_POWER();
  39         S3C24X0_GPIO * const gpio = S3C24X0_GetBase_GPIO();
  40
  41         /*
  42          * Set the 48 MHz UPLL clocking. Values are taken from
  43          * "PLL value selection guide", 6-23, s3c2400_UM.pdf.
  44          */
  45         clk_power->UPLLCON = ((40 << 12) + (1 << 4) + 2);
  46         gpio->MISCCR |= 0x8; /* 1 = use pads related USB for USB host */
  47
  48         /*
  49          * Enable USB host clock.
  50          */
  51         clk_power->CLKCON |= (1 << 4);
  52
  53         return 0;
  54 }
  55
  56 int usb_cpu_stop (void)
  57 {
  58         S3C24X0_CLOCK_POWER * const clk_power = S3C24X0_GetBase_CLOCK_POWER();
  59         /* may not want to do this */
  60         clk_power->CLKCON &= ~(1 << 4);
  61         return 0;
  62 }
  63
  64 int usb_cpu_init_fail (void)
  65 {
  66         S3C24X0_CLOCK_POWER * const clk_power = S3C24X0_GetBase_CLOCK_POWER();
  67         clk_power->CLKCON &= ~(1 << 4);
  68         return 0;
  69 }
  70
  71 # endif /* defined(CONFIG_S3C2400) || defined(CONFIG_S3C2410) */
  72 #endif /* defined(CONFIG_USB_OHCI_NEW) && defined(CONFIG_SYS_USB_OHCI_CPU_INIT) */