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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/mips/pci/pci-tx4927.c
26444 views
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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 ([email protected])

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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 <linux/interrupt.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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	pr_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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		pr_cont("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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		pr_cont("External");

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		pciclk = -1;

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	}

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	pr_cont("\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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		pr_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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void __init tx4927_setup_pcierr_irq(void)

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{

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	if (request_irq(TXX9_IRQ_BASE + TX4927_IR_PCIERR,

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			tx4927_pcierr_interrupt,

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			0, "PCI error",

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			(void *)TX4927_PCIC_REG))

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		pr_warn("Failed to request irq for PCIERR\n");

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}

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