cpu/arm926ejs/at91/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
  28 #include <asm/arch/hardware.h>
  29 #include <asm/arch/io.h>
  30 #include <asm/arch/at91_pmc.h>
  31
  32 int usb_cpu_init(void)
  33 {
  34
  35 #if defined(CONFIG_AT91CAP9) || defined(CONFIG_AT91SAM9260) || \
  36     defined(CONFIG_AT91SAM9263)
  37         /* Enable PLLB */
  38         at91_sys_write(AT91_CKGR_PLLBR, CONFIG_SYS_AT91_PLLB);
  39         while ((at91_sys_read(AT91_PMC_SR) & AT91_PMC_LOCKB) != AT91_PMC_LOCKB)
  40                 ;
  41 #endif
  42
  43         /* Enable USB host clock. */
  44         at91_sys_write(AT91_PMC_PCER, 1 << AT91_ID_UHP);
  45 #ifdef CONFIG_AT91SAM9261
  46         at91_sys_write(AT91_PMC_SCER, AT91_PMC_UHP | AT91_PMC_HCK0);
  47 #else
  48         at91_sys_write(AT91_PMC_SCER, AT91_PMC_UHP);
  49 #endif
  50
  51         return 0;
  52 }
  53
  54 int usb_cpu_stop(void)
  55 {
  56         /* Disable USB host clock. */
  57         at91_sys_write(AT91_PMC_PCDR, 1 << AT91_ID_UHP);
  58 #ifdef CONFIG_AT91SAM9261
  59         at91_sys_write(AT91_PMC_SCDR, AT91_PMC_UHP | AT91_PMC_HCK0);
  60 #else
  61         at91_sys_write(AT91_PMC_SCDR, AT91_PMC_UHP);
  62 #endif
  63
  64 #if defined(CONFIG_AT91CAP9) || defined(CONFIG_AT91SAM9260) || \
  65     defined(CONFIG_AT91SAM9263)
  66         /* Disable PLLB */
  67         at91_sys_write(AT91_CKGR_PLLBR, 0);
  68         while ((at91_sys_read(AT91_PMC_SR) & AT91_PMC_LOCKB) != 0)
  69                 ;
  70 #endif
  71
  72         return 0;
  73 }
  74
  75 int usb_cpu_init_fail(void)
  76 {
  77         return usb_cpu_stop();
  78 }
  79
  80 #endif /* defined(CONFIG_USB_OHCI) && defined(CONFIG_SYS_USB_OHCI_CPU_INIT) */