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cc1dd33f27
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>
131 lines
3.5 KiB
C
131 lines
3.5 KiB
C
/*
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* (C) Copyright 2000-2002
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* (C) Copyright 2002 (440 port)
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* Scott McNutt, Artesyn Communication Producs, smcnutt@artsyncp.com
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*
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* (C) Copyright 2003 Motorola Inc. (MPC85xx port)
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* Xianghua Xiao (X.Xiao@motorola.com)
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*
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* (C) Copyright 2004, 2007 Freescale Semiconductor. (MPC86xx Port)
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* Jeff Brown
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* Srikanth Srinivasan (srikanth.srinivasan@freescale.com)
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <mpc86xx.h>
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#include <command.h>
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#include <asm/processor.h>
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#ifdef CONFIG_POST
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#include <post.h>
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#endif
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int interrupt_init_cpu(unsigned long *decrementer_count)
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{
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volatile immap_t *immr = (immap_t *)CONFIG_SYS_IMMR;
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volatile ccsr_pic_t *pic = &immr->im_pic;
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#ifdef CONFIG_POST
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/*
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* The POST word is stored in the PIC's TFRR register which gets
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* cleared when the PIC is reset. Save it off so we can restore it
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* later.
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*/
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ulong post_word = post_word_load();
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#endif
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pic->gcr = MPC86xx_PICGCR_RST;
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while (pic->gcr & MPC86xx_PICGCR_RST)
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;
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pic->gcr = MPC86xx_PICGCR_MODE;
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*decrementer_count = get_tbclk() / CONFIG_SYS_HZ;
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debug("interrupt init: tbclk() = %d MHz, decrementer_count = %ld\n",
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(get_tbclk() / 1000000),
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*decrementer_count);
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#ifdef CONFIG_INTERRUPTS
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pic->iivpr1 = 0x810001; /* 50220 enable mcm interrupts */
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debug("iivpr1@%x = %x\n", &pic->iivpr1, pic->iivpr1);
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pic->iivpr2 = 0x810002; /* 50240 enable ddr interrupts */
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debug("iivpr2@%x = %x\n", &pic->iivpr2, pic->iivpr2);
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pic->iivpr3 = 0x810003; /* 50260 enable lbc interrupts */
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debug("iivpr3@%x = %x\n", &pic->iivpr3, pic->iivpr3);
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#if defined(CONFIG_PCI1) || defined(CONFIG_PCIE1)
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pic->iivpr8 = 0x810008; /* enable pcie1 interrupts */
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debug("iivpr8@%x = %x\n", &pic->iivpr8, pic->iivpr8);
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#endif
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#if defined(CONFIG_PCI2) || defined(CONFIG_PCIE2)
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pic->iivpr9 = 0x810009; /* enable pcie2 interrupts */
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debug("iivpr9@%x = %x\n", &pic->iivpr9, pic->iivpr9);
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#endif
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pic->ctpr = 0; /* 40080 clear current task priority register */
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#endif
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#ifdef CONFIG_POST
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post_word_store(post_word);
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#endif
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return 0;
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}
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/*
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* timer_interrupt - gets called when the decrementer overflows,
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* with interrupts disabled.
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* Trivial implementation - no need to be really accurate.
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*/
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void timer_interrupt_cpu(struct pt_regs *regs)
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{
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/* nothing to do here */
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}
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/*
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* Install and free a interrupt handler. Not implemented yet.
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*/
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void irq_install_handler(int vec, interrupt_handler_t *handler, void *arg)
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{
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}
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void irq_free_handler(int vec)
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{
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}
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/*
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* irqinfo - print information about PCI devices,not implemented.
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*/
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int do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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return 0;
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}
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/*
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* Handle external interrupts
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*/
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void external_interrupt(struct pt_regs *regs)
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{
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puts("external_interrupt (oops!)\n");
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}
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