pci-tx4939.c

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/*
 * Based on linux/arch/mips/txx9/rbtx4939/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/tx4939.h>

int __init tx4939_report_pciclk(void)
{
    int pciclk = 0;

    pr_info("PCIC --%s PCICLK:",
        (__raw_readq(&tx4939_ccfgptr->ccfg) & TX4939_CCFG_PCI66) ?
        " PCI66" : "");
    if (__raw_readq(&tx4939_ccfgptr->pcfg) & TX4939_PCFG_PCICLKEN_ALL) {
        pciclk = txx9_master_clock * 20 / 6;
        if (!(__raw_readq(&tx4939_ccfgptr->ccfg) & TX4939_CCFG_PCI66))
            pciclk /= 2;
        printk(KERN_CONT "Internal(%u.%uMHz)",
               (pciclk + 50000) / 1000000,
               ((pciclk + 50000) / 100000) % 10);
    } else {
        printk(KERN_CONT "External");
        pciclk = -1;
    }
    printk(KERN_CONT "\n");
    return pciclk;
}

void __init tx4939_report_pci1clk(void)
{
    unsigned int pciclk = txx9_master_clock * 20 / 6;

    pr_info("PCIC1 -- PCICLK:%u.%uMHz\n",
        (pciclk + 50000) / 1000000,
        ((pciclk + 50000) / 100000) % 10);
}

int __init tx4939_pcic1_map_irq(const struct pci_dev *dev, u8 slot)
{
    if (get_tx4927_pcicptr(dev->bus->sysdata) == tx4939_pcic1ptr) {
        switch (slot) {
        case TX4927_PCIC_IDSEL_AD_TO_SLOT(31):
            if (__raw_readq(&tx4939_ccfgptr->pcfg) &
                TX4939_PCFG_ET0MODE)
                return TXX9_IRQ_BASE + TX4939_IR_ETH(0);
            break;
        case TX4927_PCIC_IDSEL_AD_TO_SLOT(30):
            if (__raw_readq(&tx4939_ccfgptr->pcfg) &
                TX4939_PCFG_ET1MODE)
                return TXX9_IRQ_BASE + TX4939_IR_ETH(1);
            break;
        }
        return 0;
    }
    return -1;
}

int __init tx4939_pci_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
    int irq = tx4939_pcic1_map_irq(dev, slot);

    if (irq >= 0)
        return irq;
    irq = pin;
    /* IRQ rotation */
    irq--;  /* 0-3 */
    irq = (irq + 33 - slot) % 4;
    irq++;  /* 1-4 */

    switch (irq) {
    case 1:
        irq = TXX9_IRQ_BASE + TX4939_IR_INTA;
        break;
    case 2:
        irq = TXX9_IRQ_BASE + TX4939_IR_INTB;
        break;
    case 3:
        irq = TXX9_IRQ_BASE + TX4939_IR_INTC;
        break;
    case 4:
        irq = TXX9_IRQ_BASE + TX4939_IR_INTD;
        break;
    }
    return irq;
}

void __init tx4939_setup_pcierr_irq(void)
{
    if (request_irq(TXX9_IRQ_BASE + TX4939_IR_PCIERR,
            tx4927_pcierr_interrupt,
            0, "PCI error",
            (void *)TX4939_PCIC_REG))
        pr_warning("Failed to request irq for PCIERR\n");
}