mirror of
https://github.com/AsahiLinux/u-boot
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5c9efb36a6
Removed //-style comments. Use 80-column lines. Remove trailing whitespace. Remove dead code and debug cruft.
222 lines
4.3 KiB
C
222 lines
4.3 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 Freescale Semiconductor. (MPC86xx Port)
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* Jeff Brown (Jeffrey@freescale.com)
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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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#include <ppc_asm.tmpl>
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unsigned long decrementer_count; /* count value for 1e6/HZ microseconds */
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unsigned long timestamp;
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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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}
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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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/* interrupt is not supported yet */
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int interrupt_init_cpu (unsigned *decrementer_count)
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{
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return 0;
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}
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int interrupt_init (void)
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{
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int ret;
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/* call cpu specific function from $(CPU)/interrupts.c */
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ret = interrupt_init_cpu (&decrementer_count);
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if (ret)
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return ret;
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decrementer_count = get_tbclk()/CFG_HZ;
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debug("interrupt init: tbclk() = %d MHz, decrementer_count = %d\n", (get_tbclk()/1000000), decrementer_count);
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set_dec (decrementer_count);
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set_msr (get_msr () | MSR_EE);
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debug("MSR = 0x%08lx, Decrementer reg = 0x%08lx\n", get_msr(), get_dec());
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return 0;
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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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void increment_timestamp(void)
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{
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timestamp++;
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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
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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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void timer_interrupt (struct pt_regs *regs)
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{
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/* call cpu specific function from $(CPU)/interrupts.c */
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timer_interrupt_cpu (regs);
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timestamp++;
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ppcDcbf(×tamp);
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/* Restore Decrementer Count */
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set_dec (decrementer_count);
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#if defined(CONFIG_WATCHDOG) || defined (CONFIG_HW_WATCHDOG)
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if ((timestamp % (CFG_WATCHDOG_FREQ)) == 0)
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WATCHDOG_RESET ();
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#endif /* CONFIG_WATCHDOG || CONFIG_HW_WATCHDOG */
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#ifdef CONFIG_STATUS_LED
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status_led_tick (timestamp);
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#endif /* CONFIG_STATUS_LED */
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#ifdef CONFIG_SHOW_ACTIVITY
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board_show_activity (timestamp);
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#endif /* CONFIG_SHOW_ACTIVITY */
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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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/*
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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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}
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void
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irq_free_handler(int vec)
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{
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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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*/
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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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/*
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* Handle external interrupts
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*/
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void
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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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