LXR linux/arch/mips/pci/pci-tx4927.c

   1/*
   2 * Based on linux/arch/mips/txx9/rbtx4938/setup.c,
   3 *          and RBTX49xx patch from CELF patch archive.
   4 *
   5 * Copyright 2001, 2003-2005 MontaVista Software Inc.
   6 * Copyright (C) 2004 by Ralf Baechle (ralf@linux-mips.org)
   7 * (C) Copyright TOSHIBA CORPORATION 2000-2001, 2004-2007
   8 *
   9 * This file is subject to the terms and conditions of the GNU General Public
  10 * License.  See the file "COPYING" in the main directory of this archive
  11 * for more details.
  12 */
  13#include <linux/init.h>
  14#include <linux/pci.h>
  15#include <linux/kernel.h>
  16#include <linux/interrupt.h>
  17#include <asm/txx9/generic.h>
  18#include <asm/txx9/tx4927.h>
  19
  20int __init tx4927_report_pciclk(void)
  21{
  22        int pciclk = 0;
  23
  24        printk(KERN_INFO "PCIC --%s PCICLK:",
  25               (__raw_readq(&tx4927_ccfgptr->ccfg) & TX4927_CCFG_PCI66) ?
  26               " PCI66" : "");
  27        if (__raw_readq(&tx4927_ccfgptr->pcfg) & TX4927_PCFG_PCICLKEN_ALL) {
  28                u64 ccfg = __raw_readq(&tx4927_ccfgptr->ccfg);
  29                switch ((unsigned long)ccfg &
  30                        TX4927_CCFG_PCIDIVMODE_MASK) {
  31                case TX4927_CCFG_PCIDIVMODE_2_5:
  32                        pciclk = txx9_cpu_clock * 2 / 5; break;
  33                case TX4927_CCFG_PCIDIVMODE_3:
  34                        pciclk = txx9_cpu_clock / 3; break;
  35                case TX4927_CCFG_PCIDIVMODE_5:
  36                        pciclk = txx9_cpu_clock / 5; break;
  37                case TX4927_CCFG_PCIDIVMODE_6:
  38                        pciclk = txx9_cpu_clock / 6; break;
  39                }
  40                printk("Internal(%u.%uMHz)",
  41                       (pciclk + 50000) / 1000000,
  42                       ((pciclk + 50000) / 100000) % 10);
  43        } else {
  44                printk("External");
  45                pciclk = -1;
  46        }
  47        printk("\n");
  48        return pciclk;
  49}
  50
  51int __init tx4927_pciclk66_setup(void)
  52{
  53        int pciclk;
  54
  55        /* Assert M66EN */
  56        tx4927_ccfg_set(TX4927_CCFG_PCI66);
  57        /* Double PCICLK (if possible) */
  58        if (__raw_readq(&tx4927_ccfgptr->pcfg) & TX4927_PCFG_PCICLKEN_ALL) {
  59                unsigned int pcidivmode = 0;
  60                u64 ccfg = __raw_readq(&tx4927_ccfgptr->ccfg);
  61                pcidivmode = (unsigned long)ccfg &
  62                        TX4927_CCFG_PCIDIVMODE_MASK;
  63                switch (pcidivmode) {
  64                case TX4927_CCFG_PCIDIVMODE_5:
  65                case TX4927_CCFG_PCIDIVMODE_2_5:
  66                        pcidivmode = TX4927_CCFG_PCIDIVMODE_2_5;
  67                        pciclk = txx9_cpu_clock * 2 / 5;
  68                        break;
  69                case TX4927_CCFG_PCIDIVMODE_6:
  70                case TX4927_CCFG_PCIDIVMODE_3:
  71                default:
  72                        pcidivmode = TX4927_CCFG_PCIDIVMODE_3;
  73                        pciclk = txx9_cpu_clock / 3;
  74                }
  75                tx4927_ccfg_change(TX4927_CCFG_PCIDIVMODE_MASK,
  76                                   pcidivmode);
  77                printk(KERN_DEBUG "PCICLK: ccfg:%08lx\n",
  78                       (unsigned long)__raw_readq(&tx4927_ccfgptr->ccfg));
  79        } else
  80                pciclk = -1;
  81        return pciclk;
  82}
  83
  84void __init tx4927_setup_pcierr_irq(void)
  85{
  86        if (request_irq(TXX9_IRQ_BASE + TX4927_IR_PCIERR,
  87                        tx4927_pcierr_interrupt,
  88                        0, "PCI error",
  89                        (void *)TX4927_PCIC_REG))
  90                printk(KERN_WARNING "Failed to request irq for PCIERR\n");
  91}
  92