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https://github.com/brain-hackers/u-boot-brain
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![wdenk](/assets/img/avatar_default.png)
Add support for the Xilinx ML300 platform * Patch by Stephan Linz, 17 Feb 2004: Fix watchdog support for NIOS * Patch by Josh Fryman, 16 Feb 2004: Fix byte-swapping for cfi_flash.c for different bus widths * Patch by Jon Diekema, 14 Jeb 2004: Remove duplicate "FPGA Support" notes from the README file
197 lines
4.6 KiB
C
197 lines
4.6 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 2003, Psyent Corporation <www.psyent.com>
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* Scott McNutt <smcnutt@psyent.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 <nios.h>
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#include <nios-io.h>
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#include <asm/ptrace.h>
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#include <common.h>
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#include <command.h>
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#include <watchdog.h>
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#ifdef CONFIG_STATUS_LED
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#include <status_led.h>
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#endif
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/****************************************************************************/
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struct irq_action {
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interrupt_handler_t *handler;
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void *arg;
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int count;
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};
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static struct irq_action irq_vecs[64];
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/*************************************************************************/
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volatile ulong timestamp = 0;
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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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WATCHDOG_RESET ();
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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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/* The board must handle this interrupt if a timer is not
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* provided.
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*/
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#if defined(CFG_NIOS_TMRBASE)
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void timer_interrupt (struct pt_regs *regs)
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{
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/* Interrupt is cleared by writing anything to the
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* status register.
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*/
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nios_timer_t *tmr = (nios_timer_t *)CFG_NIOS_TMRBASE;
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tmr->status = 0;
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timestamp += CFG_NIOS_TMRMS;
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#ifdef CONFIG_STATUS_LED
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status_led_tick(timestamp);
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#endif
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}
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#endif
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/*************************************************************************/
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int disable_interrupts (void)
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{
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int val = 0;
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/* Writing anything to CLR_IE disables interrupts */
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val = rdctl (CTL_STATUS);
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wrctl (CTL_CLR_IE, 0);
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return (val & STATUS_IE);
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}
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void enable_interrupts( void )
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{
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/* Writing anything SET_IE enables interrupts */
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wrctl (CTL_SET_IE, 0);
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}
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void external_interrupt (struct pt_regs *regs)
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{
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unsigned vec;
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vec = (regs->status & STATUS_IPRI) >> 9; /* ipri */
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irq_vecs[vec].count++;
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if (irq_vecs[vec].handler != NULL) {
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(*irq_vecs[vec].handler)(irq_vecs[vec].arg);
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} else {
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/* A sad side-effect of masking a bogus interrupt is
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* that lower priority interrupts will also be disabled.
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* This is probably not what we want ... so hang insted.
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*/
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printf ("Unhandled interrupt: 0x%x\n", vec);
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disable_interrupts ();
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hang ();
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}
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}
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/*************************************************************************/
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int interrupt_init (void)
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{
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int vec;
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#if defined(CFG_NIOS_TMRBASE)
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nios_timer_t *tmr = (nios_timer_t *)CFG_NIOS_TMRBASE;
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tmr->control &= ~NIOS_TIMER_ITO;
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tmr->control |= NIOS_TIMER_STOP;
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#if defined(CFG_NIOS_TMRCNT)
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tmr->periodl = CFG_NIOS_TMRCNT & 0xffff;
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tmr->periodh = (CFG_NIOS_TMRCNT >> 16) & 0xffff;
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#endif
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#endif
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for (vec=0; vec<64; vec++ ) {
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irq_vecs[vec].handler = NULL;
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irq_vecs[vec].arg = NULL;
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irq_vecs[vec].count = 0;
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}
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/* Need timus interruptus -- start the lopri timer */
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#if defined(CFG_NIOS_TMRBASE)
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tmr->control |= ( NIOS_TIMER_ITO |
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NIOS_TIMER_CONT |
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NIOS_TIMER_START );
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ipri (CFG_NIOS_TMRIRQ + 1);
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#endif
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enable_interrupts ();
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return (0);
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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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struct irq_action *irqa = irq_vecs;
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int i = vec;
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int flag;
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if (irqa[i].handler != NULL) {
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printf ("Interrupt vector %d: handler 0x%x "
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"replacing 0x%x\n",
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vec, (uint)handler, (uint)irqa[i].handler);
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}
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flag = disable_interrupts ();
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irqa[i].handler = handler;
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irqa[i].arg = arg;
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if (flag )
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enable_interrupts ();
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}
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/*************************************************************************/
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#if (CONFIG_COMMANDS & CFG_CMD_IRQ)
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int do_irqinfo (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
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{
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int vec;
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printf ("\nInterrupt-Information:\n");
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printf ("Nr Routine Arg CouIt's ok to cnt\n");
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for (vec=0; vec<64; vec++) {
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if (irq_vecs[vec].handler != NULL) {
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printf ("%02d %08lx %08lx %d\n",
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vec,
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(ulong)irq_vecs[vec].handler<<1,
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(ulong)irq_vecs[vec].arg,
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irq_vecs[vec].count);
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}
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}
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return (0);
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}
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#endif /* CONFIG_COMMANDS & CFG_CMD_IRQ */
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