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84 lines
2.4 KiB
C
84 lines
2.4 KiB
C
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/*
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* linux/arch/mips/pci/pci-tx4927.c
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*
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* Based on linux/arch/mips/txx9/rbtx4938/setup.c,
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* and RBTX49xx patch from CELF patch archive.
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*
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* Copyright 2001, 2003-2005 MontaVista Software Inc.
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* Copyright (C) 2004 by Ralf Baechle (ralf@linux-mips.org)
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* (C) Copyright TOSHIBA CORPORATION 2000-2001, 2004-2007
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <linux/kernel.h>
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#include <asm/txx9/generic.h>
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#include <asm/txx9/tx4927.h>
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int __init tx4927_report_pciclk(void)
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{
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int pciclk = 0;
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printk(KERN_INFO "PCIC --%s PCICLK:",
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(__raw_readq(&tx4927_ccfgptr->ccfg) & TX4927_CCFG_PCI66) ?
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" PCI66" : "");
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if (__raw_readq(&tx4927_ccfgptr->pcfg) & TX4927_PCFG_PCICLKEN_ALL) {
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u64 ccfg = __raw_readq(&tx4927_ccfgptr->ccfg);
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switch ((unsigned long)ccfg &
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TX4927_CCFG_PCIDIVMODE_MASK) {
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case TX4927_CCFG_PCIDIVMODE_2_5:
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pciclk = txx9_cpu_clock * 2 / 5; break;
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case TX4927_CCFG_PCIDIVMODE_3:
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pciclk = txx9_cpu_clock / 3; break;
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case TX4927_CCFG_PCIDIVMODE_5:
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pciclk = txx9_cpu_clock / 5; break;
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case TX4927_CCFG_PCIDIVMODE_6:
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pciclk = txx9_cpu_clock / 6; break;
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}
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printk("Internal(%u.%uMHz)",
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(pciclk + 50000) / 1000000,
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((pciclk + 50000) / 100000) % 10);
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} else {
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printk("External");
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pciclk = -1;
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}
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printk("\n");
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return pciclk;
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}
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int __init tx4927_pciclk66_setup(void)
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{
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int pciclk;
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/* Assert M66EN */
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tx4927_ccfg_set(TX4927_CCFG_PCI66);
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/* Double PCICLK (if possible) */
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if (__raw_readq(&tx4927_ccfgptr->pcfg) & TX4927_PCFG_PCICLKEN_ALL) {
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unsigned int pcidivmode = 0;
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u64 ccfg = __raw_readq(&tx4927_ccfgptr->ccfg);
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pcidivmode = (unsigned long)ccfg &
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TX4927_CCFG_PCIDIVMODE_MASK;
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switch (pcidivmode) {
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case TX4927_CCFG_PCIDIVMODE_5:
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case TX4927_CCFG_PCIDIVMODE_2_5:
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pcidivmode = TX4927_CCFG_PCIDIVMODE_2_5;
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pciclk = txx9_cpu_clock * 2 / 5;
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break;
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case TX4927_CCFG_PCIDIVMODE_6:
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case TX4927_CCFG_PCIDIVMODE_3:
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default:
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pcidivmode = TX4927_CCFG_PCIDIVMODE_3;
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pciclk = txx9_cpu_clock / 3;
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}
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tx4927_ccfg_change(TX4927_CCFG_PCIDIVMODE_MASK,
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pcidivmode);
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printk(KERN_DEBUG "PCICLK: ccfg:%08lx\n",
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(unsigned long)__raw_readq(&tx4927_ccfgptr->ccfg));
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} else
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pciclk = -1;
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return pciclk;
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}
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