mpc107.c

MIPS处理器的bootloader,龙芯就是用的修改过的PMON2

/* $Id: mpc107.c,v 1.5 2002/08/11 11:30:38 pefo Exp $ */

/*
 * Copyright (c) 2000 Opsycon AB  (www.opsycon.se)
 * Copyright (c) 2000 Rtmx, Inc   (www.rtmx.com)
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed for Rtmx, Inc by
 *      Opsycon Open System Consulting AB, Sweden.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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.
 *
 */

#include <sys/param.h>
#include <sys/device.h>
#include <sys/systm.h>

#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <pmon/dev/mpc107reg.h>
#include <pmon.h>
#include <stdlib.h>

static pcireg_t _pci_conf_readn(pcitag_t tag, int reg, int width);
static void _pci_conf_writen(pcitag_t tag, int reg, pcireg_t data, int width);
extern int _pciverbose;


/*
 *  Make pci tag from bus, device and function data.
 */
pcitag_t
_pci_make_tag(bus, device, function)
	int bus;
	int device;
	int function;
{
	pcitag_t tag;

	tag = (bus << 16) | (device << 11) | (function << 8);
	return(tag);
}

/*
 *  Break up a pci tag to bus, device function components.
 */
void
_pci_break_tag(tag, busp, devicep, functionp)
	pcitag_t tag;
	int *busp;
	int *devicep;
	int *functionp;
{
	if (busp) {
		*busp = (tag >> 16) & 255;
	}
	if (devicep) {
		*devicep = (tag >> 11) & 31;
	}
	if (functionp) {
		*functionp = (tag >> 8) & 7;
	}
}



/*
 *  Read a value form PCI configuration space. Support for
 *  all three data sizes (byte, halfword and word) is provided.
 */
static pcireg_t
_pci_conf_readn(tag, reg, width)
	pcitag_t tag;
	int reg;
	int width;
{
	pcireg_t data;
	u_int32_t addr;
	u_int32_t bus, dev, func;

	if (reg & (width-1) || reg < 0 || reg >= 0x100) {
#ifdef PMON_PCIDEBUG		
		if (_pciverbose >= 1) {
			_pci_tagprintf (tag, "_pci_conf_read: bad reg 0x%x\r\n", reg);
		}
#endif /* PMON_PCIDEBUG	*/
		return ~0;
	}

	_pci_break_tag (tag, &bus, &dev, &func); 

	/* Type 1 configuration for PCI bus */
	if (bus > 255 || dev > 31 || func > 7) {
		return ~0;		/* device out of range */
	}

	addr = 0x80000000 | tag | reg;
	out32rb(MPC107_CONF_ADDR, addr);

	switch (width) {
	case 1:
		data = (pcireg_t)in8rb(MPC107_CONF_DATA + (reg & 3));
		break;
		
	case 2:
		data = (pcireg_t)in16rb(MPC107_CONF_DATA + (reg & 2));
		break;
		
	default:
	case 4:
		data = (pcireg_t)in32rb(MPC107_CONF_DATA);
		break;
	}
	/* XXX We should prolly check err status here but what the... */
	return data;
}


pcireg_t
_pci_conf_read(pcitag_t tag, int reg)
{
    return _pci_conf_readn (tag, reg, 4);
}

/*
 *  Write a value to PCI configuration space. Support for
 *  all three data sizes (byte, halfword and word) is provided.
 */
static void
_pci_conf_writen(tag, reg, data, width)
	pcitag_t tag;
	int reg;
	pcireg_t data;
	int width;
{
	u_int32_t addr;
	u_int32_t bus, dev, func;

	if (reg & (width-1) || reg < 0 || reg >= 0x100) {
#ifdef PMON_PCIDEBUG		
		if (_pciverbose >= 1) { 
			_pci_tagprintf(tag, "_pci_conf_write: bad reg %x\r\n", reg);
		}
#endif /* PMON_PCIDEBUG */
		return;
	}

	_pci_break_tag (tag, &bus, &dev, &func);

	/* Type 1 configuration for PCI bus */
	if (bus > 255 || dev > 31 || func > 7) {
		return;		/* device out of range */
	}
	
	addr = 0x80000000 | tag | (func << 8) | reg;

	out32rb(MPC107_CONF_ADDR, addr);
	
	switch (width) {
	case 1:
		out8rb(MPC107_CONF_DATA + (reg & 3),  data);
		break;
		
	case 2:
		out16rb(MPC107_CONF_DATA + (reg & 2),  data);
		break;
		
	default:
	case 4:
		out32rb(MPC107_CONF_DATA,  data);
		break;
	}
	/* XXX We should prolly check err status here but what the... */
}

void
_pci_conf_write(pcitag_t tag, int reg, pcireg_t data)
{
    _pci_conf_writen (tag, reg, data, 4);
}