board_setup.c

linux内核源码

/*
 *
 * BRIEF MODULE DESCRIPTION
 *	4G Systems MTX-1 board setup.
 *
 * Copyright 2003 MontaVista Software Inc.
 * Author: MontaVista Software, Inc.
 *         	[e-mail] or [e-mail]
 *         Bruno Randolf <[e-mail]>
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 *
 *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
 *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
 *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *  You should have received a copy of the  GNU General Public License along
 *  with this program; if not, write  to the Free Software Foundation, Inc.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 */
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/ioport.h>
#include <linux/mm.h>
#include <linux/console.h>
#include <linux/delay.h>

#include <asm/cpu.h>
#include <asm/bootinfo.h>
#include <asm/irq.h>
#include <asm/mipsregs.h>
#include <asm/reboot.h>
#include <asm/pgtable.h>
#include <asm/mach-au1x00/au1000.h>

extern int (*board_pci_idsel)(unsigned int devsel, int assert);
int    mtx1_pci_idsel(unsigned int devsel, int assert);

void board_reset(void)
{
	/* Hit BCSR.SYSTEM_CONTROL[SW_RST] */
	au_writel(0x00000000, 0xAE00001C);
}

void __init board_setup(void)
{
#if defined(CONFIG_USB_OHCI_HCD) || defined(CONFIG_USB_OHCI_HCD_MODULE)
	// enable USB power switch
	au_writel( au_readl(GPIO2_DIR) | 0x10, GPIO2_DIR );
	au_writel( 0x100000, GPIO2_OUTPUT );
#endif /* defined(CONFIG_USB_OHCI_HCD) || defined(CONFIG_USB_OHCI_HCD_MODULE) */

#ifdef CONFIG_PCI
#if defined(__MIPSEB__)
	au_writel(0xf | (2<<6) | (1<<4), Au1500_PCI_CFG);
#else
	au_writel(0xf, Au1500_PCI_CFG);
#endif
#endif

	// initialize sys_pinfunc:
	au_writel( SYS_PF_NI2, SYS_PINFUNC );

	// initialize GPIO
	au_writel( 0xFFFFFFFF, SYS_TRIOUTCLR );
	au_writel( 0x00000001, SYS_OUTPUTCLR ); // set M66EN (PCI 66MHz) to OFF
	au_writel( 0x00000008, SYS_OUTPUTSET ); // set PCI CLKRUN# to OFF
	au_writel( 0x00000002, SYS_OUTPUTSET ); // set EXT_IO3 ON
	au_writel( 0x00000020, SYS_OUTPUTCLR ); // set eth PHY TX_ER to OFF

	// enable LED and set it to green
	au_writel( au_readl(GPIO2_DIR) | 0x1800, GPIO2_DIR );
	au_writel( 0x18000800, GPIO2_OUTPUT );

	board_pci_idsel = mtx1_pci_idsel;

	printk("4G Systems MTX-1 Board\n");
}

int
mtx1_pci_idsel(unsigned int devsel, int assert)
{
#define MTX_IDSEL_ONLY_0_AND_3 0
#if MTX_IDSEL_ONLY_0_AND_3
       if (devsel != 0 && devsel != 3) {
               printk("*** not 0 or 3\n");
               return 0;
       }
#endif

       if (assert && devsel != 0) {
               // supress signal to cardbus
               au_writel( 0x00000002, SYS_OUTPUTCLR ); // set EXT_IO3 OFF
       }
       else {
               au_writel( 0x00000002, SYS_OUTPUTSET ); // set EXT_IO3 ON
       }
       au_sync_udelay(1);
       return 1;
}