pci-tx4927.c

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/*
 * Based on linux/arch/mips/txx9/rbtx4938/setup.c,
 *      and RBTX49xx patch from CELF patch archive.
 *
 * Copyright 2001, 2003-2005 MontaVista Software Inc.
 * Copyright (C) 2004 by Ralf Baechle ([email protected])
 * (C) Copyright TOSHIBA CORPORATION 2000-2001, 2004-2007
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <asm/txx9/generic.h>
#include <asm/txx9/tx4927.h>

int __init tx4927_report_pciclk(void)
{
    int pciclk = 0;

    printk(KERN_INFO "PCIC --%s PCICLK:",
           (__raw_readq(&tx4927_ccfgptr->ccfg) & TX4927_CCFG_PCI66) ?
           " PCI66" : "");
    if (__raw_readq(&tx4927_ccfgptr->pcfg) & TX4927_PCFG_PCICLKEN_ALL) {
        u64 ccfg = __raw_readq(&tx4927_ccfgptr->ccfg);
        switch ((unsigned long)ccfg &
            TX4927_CCFG_PCIDIVMODE_MASK) {
        case TX4927_CCFG_PCIDIVMODE_2_5:
            pciclk = txx9_cpu_clock * 2 / 5; break;
        case TX4927_CCFG_PCIDIVMODE_3:
            pciclk = txx9_cpu_clock / 3; break;
        case TX4927_CCFG_PCIDIVMODE_5:
            pciclk = txx9_cpu_clock / 5; break;
        case TX4927_CCFG_PCIDIVMODE_6:
            pciclk = txx9_cpu_clock / 6; break;
        }
        printk("Internal(%u.%uMHz)",
               (pciclk + 50000) / 1000000,
               ((pciclk + 50000) / 100000) % 10);
    } else {
        printk("External");
        pciclk = -1;
    }
    printk("\n");
    return pciclk;
}

int __init tx4927_pciclk66_setup(void)
{
    int pciclk;

    /* Assert M66EN */
    tx4927_ccfg_set(TX4927_CCFG_PCI66);
    /* Double PCICLK (if possible) */
    if (__raw_readq(&tx4927_ccfgptr->pcfg) & TX4927_PCFG_PCICLKEN_ALL) {
        unsigned int pcidivmode = 0;
        u64 ccfg = __raw_readq(&tx4927_ccfgptr->ccfg);
        pcidivmode = (unsigned long)ccfg &
            TX4927_CCFG_PCIDIVMODE_MASK;
        switch (pcidivmode) {
        case TX4927_CCFG_PCIDIVMODE_5:
        case TX4927_CCFG_PCIDIVMODE_2_5:
            pcidivmode = TX4927_CCFG_PCIDIVMODE_2_5;
            pciclk = txx9_cpu_clock * 2 / 5;
            break;
        case TX4927_CCFG_PCIDIVMODE_6:
        case TX4927_CCFG_PCIDIVMODE_3:
        default:
            pcidivmode = TX4927_CCFG_PCIDIVMODE_3;
            pciclk = txx9_cpu_clock / 3;
        }
        tx4927_ccfg_change(TX4927_CCFG_PCIDIVMODE_MASK,
                   pcidivmode);
        printk(KERN_DEBUG "PCICLK: ccfg:%08lx\n",
               (unsigned long)__raw_readq(&tx4927_ccfgptr->ccfg));
    } else
        pciclk = -1;
    return pciclk;
}

void __init tx4927_setup_pcierr_irq(void)
{
    if (request_irq(TXX9_IRQ_BASE + TX4927_IR_PCIERR,
            tx4927_pcierr_interrupt,
            0, "PCI error",
            (void *)TX4927_PCIC_REG))
        printk(KERN_WARNING "Failed to request irq for PCIERR\n");
}