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pci-tx4939.c

/*
 * linux/arch/mips/pci/pci-tx4939.c
 *
 * 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 (ralf@linux-mips.org)
 * (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,
                  IRQF_DISABLED, "PCI error",
                  (void *)TX4939_PCIC_REG))
            pr_warning("Failed to request irq for PCIERR\n");
}

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