92 lines
2.6 KiB
C
92 lines
2.6 KiB
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");
|
|
}
|