linux-vybrid_public/arch/mips/ddb5xxx/common/nile4.c

/*
 *
 * Copyright 2001 MontaVista Software Inc.
 * Author: jsun@mvista.com or jsun@junsun.net
 *
 * arch/mips/ddb5xxx/common/nile4.c
 *     misc low-level routines for vrc-5xxx controllers.
 *
 * derived from original code by Geert Uytterhoeven <geert@sonycom.com>
 *
 * 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.
 */
#include <linux/types.h>
#include <linux/kernel.h>

#include <asm/ddb5xxx/ddb5xxx.h>

u32
ddb_calc_pdar(u32 phys, u32 size, int width,
	      int on_memory_bus, int pci_visible)
{
        u32 maskbits;
        u32 widthbits;

        switch (size) {
#if 0                           /* We don't support 4 GB yet */
        case 0x100000000:       /* 4 GB */
                maskbits = 4;
                break;
#endif
        case 0x80000000:        /* 2 GB */
                maskbits = 5;
                break;
        case 0x40000000:        /* 1 GB */
                maskbits = 6;
                break;
        case 0x20000000:        /* 512 MB */
                maskbits = 7;
                break;
        case 0x10000000:        /* 256 MB */
                maskbits = 8;
                break;
        case 0x08000000:        /* 128 MB */
                maskbits = 9;
                break;
        case 0x04000000:        /* 64 MB */
                maskbits = 10;
                break;
        case 0x02000000:        /* 32 MB */
                maskbits = 11;
                break;
        case 0x01000000:        /* 16 MB */
                maskbits = 12;
                break;
        case 0x00800000:        /* 8 MB */
                maskbits = 13;
                break;
        case 0x00400000:        /* 4 MB */
                maskbits = 14;
                break;
        case 0x00200000:        /* 2 MB */
                maskbits = 15;
                break;
        case 0:         /* OFF */
                maskbits = 0;
                break;
        default:
                panic("nile4_set_pdar: unsupported size %p", (void *) size);
        }
        switch (width) {
        case 8:
                widthbits = 0;
                break;
        case 16:
                widthbits = 1;
                break;
        case 32:
                widthbits = 2;
                break;
        case 64:
                widthbits = 3;
                break;
        default:
                panic("nile4_set_pdar: unsupported width %d", width);
        }

	return maskbits | (on_memory_bus ? 0x10 : 0) |
		(pci_visible ? 0x20 : 0) | (widthbits << 6) |
		(phys & 0xffe00000);
}

void
ddb_set_pdar(u32 pdar, u32 phys, u32 size, int width,
	     int on_memory_bus, int pci_visible)
{
	u32 temp= ddb_calc_pdar(phys, size, width, on_memory_bus, pci_visible);
	ddb_out32(pdar, temp);
	ddb_out32(pdar + 4, 0);

        /*
         * When programming a PDAR, the register should be read immediately
         * after writing it. This ensures that address decoders are properly
         * configured.
	 * [jsun] is this really necessary?
         */
        ddb_in32(pdar);
        ddb_in32(pdar + 4);
}

/*
 * routines that mess with PCIINITx registers
 */

void ddb_set_pmr(u32 pmr, u32 type, u32 addr, u32 options)
{
        switch (type) {
        case DDB_PCICMD_IACK: /* PCI Interrupt Acknowledge */
        case DDB_PCICMD_IO:   /* PCI I/O Space */
        case DDB_PCICMD_MEM:  /* PCI Memory Space */
        case DDB_PCICMD_CFG:  /* PCI Configuration Space */
                break;
        default:
                panic("nile4_set_pmr: invalid type %d", type);
        }
        ddb_out32(pmr, (type << 1) | (addr & 0xffe00000) | options );
        ddb_out32(pmr + 4, 0);
}