LXR uboot/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) && \
  27    defined(CONFIG_SYS_USB_OHCI_CPU_INIT) && \
  28    defined(CONFIG_S3C24X0)
  29
  30#include <asm/arch/s3c24x0_cpu.h>
  31#include <asm/io.h>
  32
  33int usb_cpu_init(void)
  34{
  35        struct s3c24x0_clock_power *clk_power = s3c24x0_get_base_clock_power();
  36        struct s3c24x0_gpio *gpio = s3c24x0_get_base_gpio();
  37
  38        /*
  39         * Set the 48 MHz UPLL clocking. Values are taken from
  40         * "PLL value selection guide", 6-23, s3c2400_UM.pdf.
  41         */
  42        writel((40 << 12) + (1 << 4) + 2, &clk_power->UPLLCON);
  43        /* 1 = use pads related USB for USB host */
  44        writel(readl(&gpio->MISCCR) | 0x8, &gpio->MISCCR);
  45
  46        /*
  47         * Enable USB host clock.
  48         */
  49        writel(readl(&clk_power->CLKCON) | (1 << 4), &clk_power->CLKCON);
  50
  51        return 0;
  52}
  53
  54int usb_cpu_stop(void)
  55{
  56        struct s3c24x0_clock_power *clk_power = s3c24x0_get_base_clock_power();
  57        /* may not want to do this */
  58        writel(readl(&clk_power->CLKCON) & ~(1 << 4), &clk_power->CLKCON);
  59        return 0;
  60}
  61
  62int usb_cpu_init_fail(void)
  63{
  64        struct s3c24x0_clock_power *clk_power = s3c24x0_get_base_clock_power();
  65        writel(readl(&clk_power->CLKCON) & ~(1 << 4), &clk_power->CLKCON);
  66        return 0;
  67}
  68
  69#endif /* defined(CONFIG_USB_OHCI_NEW) && \
  70           defined(CONFIG_SYS_USB_OHCI_CPU_INIT) && \
  71           defined(CONFIG_S3C24X0) */
  72