mirror of
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163 lines
3.5 KiB
C
163 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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* 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 <watchdog.h>
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#include <command.h>
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#include <asm/processor.h>
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#include <ppc_asm.tmpl>
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unsigned decrementer_count; /* count value for 1e6/HZ microseconds */
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static __inline__ unsigned long get_msr(void)
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{
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unsigned long msr;
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asm volatile("mfmsr %0" : "=r" (msr) :);
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return msr;
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}
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static __inline__ void set_msr(unsigned long msr)
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{
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asm volatile("mtmsr %0" : : "r" (msr));
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asm volatile("isync");
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}
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static __inline__ unsigned long get_dec (void)
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{
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unsigned long val;
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asm volatile ("mfdec %0":"=r" (val):);
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return val;
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}
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static __inline__ void set_dec (unsigned long val)
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{
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if (val)
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asm volatile ("mtdec %0"::"r" (val));
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}
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void enable_interrupts (void)
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{
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set_msr (get_msr() | MSR_EE);
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}
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/* returns flag if MSR_EE was set before */
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int disable_interrupts (void)
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{
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ulong msr = get_msr();
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set_msr (msr & ~MSR_EE);
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return ((msr & MSR_EE) != 0);
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}
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int interrupt_init (void)
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{
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volatile immap_t *immr = (immap_t *)CFG_IMMR;
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immr->im_pic.gcr = MPC85xx_PICGCR_RST;
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while (immr->im_pic.gcr & MPC85xx_PICGCR_RST);
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immr->im_pic.gcr = MPC85xx_PICGCR_M;
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decrementer_count = get_tbclk() / CFG_HZ;
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mtspr(SPRN_TCR, TCR_PIE);
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set_dec (decrementer_count);
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set_msr (get_msr () | MSR_EE);
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return (0);
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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
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irq_install_handler(int vec, interrupt_handler_t *handler, void *arg)
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{
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return;
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}
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void
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irq_free_handler(int vec)
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{
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return;
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}
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/****************************************************************************/
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volatile ulong timestamp = 0;
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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(struct pt_regs *regs)
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{
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timestamp++;
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set_dec (decrementer_count);
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mtspr(SPRN_TSR, TSR_PIS);
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#if defined(CONFIG_WATCHDOG)
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if ((timestamp % 1000) == 0)
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reset_85xx_watchdog();
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#endif /* CONFIG_WATCHDOG */
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}
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void reset_timer (void)
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{
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timestamp = 0;
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}
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ulong get_timer (ulong base)
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{
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return (timestamp - base);
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}
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void set_timer (ulong t)
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{
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timestamp = t;
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}
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#if (CONFIG_COMMANDS & CFG_CMD_IRQ)
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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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*/
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int
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do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
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{
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printf ("\nInterrupt-unsupported:\n");
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return 0;
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}
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#endif /* CONFIG_COMMANDS & CFG_CMD_IRQ */
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