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pci-tx4927.c

/*
 * linux/arch/mips/pci/pci-tx4927.c
 *
 * 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 (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/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,
                  IRQF_DISABLED, "PCI error",
                  (void *)TX4927_PCIC_REG))
            printk(KERN_WARNING "Failed to request irq for PCIERR\n");
}

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