u-boot/arch/powerpc/cpu/mpc85xx/interrupts.c
John Schmoller cc1dd33f27 mpc8[5/6]xx: Ensure POST word does not get reset
The POST word is stored in a spare register in the PIC on MPC8[5/6]xx
processors.  When interrupt_init() is called, this register gets reset
which resulted in all POST_RAM POSTs not being ran due to the corrupted
POST word.  To resolve this, store off POST word before the PIC is
reset, and restore it after the PIC has been initialized.

Signed-off-by: John Schmoller <jschmoller@xes-inc.com>
Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
2011-03-13 11:24:44 -05:00

126 lines
3.4 KiB
C

/*
* (C) Copyright 2000-2002
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* (C) Copyright 2002 (440 port)
* Scott McNutt, Artesyn Communication Producs, smcnutt@artsyncp.com
*
* (C) Copyright 2003 Motorola Inc. (MPC85xx port)
* Xianghua Xiao (X.Xiao@motorola.com)
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <watchdog.h>
#include <command.h>
#include <asm/processor.h>
#include <asm/io.h>
#ifdef CONFIG_POST
#include <post.h>
#endif
int interrupt_init_cpu(unsigned int *decrementer_count)
{
ccsr_pic_t __iomem *pic = (void *)CONFIG_SYS_MPC8xxx_PIC_ADDR;
#ifdef CONFIG_POST
/*
* The POST word is stored in the PIC's TFRR register which gets
* cleared when the PIC is reset. Save it off so we can restore it
* later.
*/
ulong post_word = post_word_load();
#endif
out_be32(&pic->gcr, MPC85xx_PICGCR_RST);
while (in_be32(&pic->gcr) & MPC85xx_PICGCR_RST)
;
out_be32(&pic->gcr, MPC85xx_PICGCR_M);
in_be32(&pic->gcr);
*decrementer_count = get_tbclk() / CONFIG_SYS_HZ;
/* PIE is same as DIE, dec interrupt enable */
mtspr(SPRN_TCR, TCR_PIE);
#ifdef CONFIG_INTERRUPTS
pic->iivpr1 = 0x810001; /* 50220 enable ecm interrupts */
debug("iivpr1@%x = %x\n", (uint)&pic->iivpr1, pic->iivpr1);
pic->iivpr2 = 0x810002; /* 50240 enable ddr interrupts */
debug("iivpr2@%x = %x\n", (uint)&pic->iivpr2, pic->iivpr2);
pic->iivpr3 = 0x810003; /* 50260 enable lbc interrupts */
debug("iivpr3@%x = %x\n", (uint)&pic->iivpr3, pic->iivpr3);
#ifdef CONFIG_PCI1
pic->iivpr8 = 0x810008; /* enable pci1 interrupts */
debug("iivpr8@%x = %x\n", (uint)&pic->iivpr8, pic->iivpr8);
#endif
#if defined(CONFIG_PCI2) || defined(CONFIG_PCIE2)
pic->iivpr9 = 0x810009; /* enable pci1 interrupts */
debug("iivpr9@%x = %x\n", (uint)&pic->iivpr9, pic->iivpr9);
#endif
#ifdef CONFIG_PCIE1
pic->iivpr10 = 0x81000a; /* enable pcie1 interrupts */
debug("iivpr10@%x = %x\n", (uint)&pic->iivpr10, pic->iivpr10);
#endif
#ifdef CONFIG_PCIE3
pic->iivpr11 = 0x81000b; /* enable pcie3 interrupts */
debug("iivpr11@%x = %x\n", (uint)&pic->iivpr11, pic->iivpr11);
#endif
pic->ctpr=0; /* 40080 clear current task priority register */
#endif
#ifdef CONFIG_POST
post_word_store(post_word);
#endif
return (0);
}
/* Install and free a interrupt handler. Not implemented yet. */
void
irq_install_handler(int vec, interrupt_handler_t *handler, void *arg)
{
return;
}
void
irq_free_handler(int vec)
{
return;
}
void timer_interrupt_cpu(struct pt_regs *regs)
{
/* PIS is same as DIS, dec interrupt status */
mtspr(SPRN_TSR, TSR_PIS);
}
#if defined(CONFIG_CMD_IRQ)
/* irqinfo - print information about PCI devices,not implemented. */
int do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
return 0;
}
#endif