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* Detlev Zundel, DENX Software Engineering, dzu@denx.de
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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* Josh Huber <huber@mclx.com>, Mission Critical Linux, Inc.
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* See file CREDITS for list of people who contributed to this
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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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* 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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* 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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/* this section was ripped out of arch/ppc/syslib/mpc52xx_pic.c in the
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* Linux 2.6 source with the following copyright.
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* Based on (well, mostly copied from) the code from the 2.4 kernel by
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* Dale Farnsworth <dfarnsworth@mvista.com> and Kent Borg.
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* Copyright (C) 2004 Sylvain Munaut <tnt@246tNt.com>
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* Copyright (C) 2003 Montavista Software, Inc
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#include <asm/processor.h>
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interrupt_handler_t *handler;
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static struct irq_action irq_handlers[NR_IRQS];
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static struct mpc5xxx_intr *intr;
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static struct mpc5xxx_sdma *sdma;
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static void mpc5xxx_ic_disable(unsigned int irq)
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if (irq == MPC5XXX_IRQ0) {
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val = in_be32(&intr->ctrl);
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out_be32(&intr->ctrl, val);
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} else if (irq < MPC5XXX_IRQ1) {
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} else if (irq <= MPC5XXX_IRQ3) {
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val = in_be32(&intr->ctrl);
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val &= ~(1 << (10 - (irq - MPC5XXX_IRQ1)));
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out_be32(&intr->ctrl, val);
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} else if (irq < MPC5XXX_SDMA_IRQ_BASE) {
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val = in_be32(&intr->main_mask);
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val |= 1 << (16 - (irq - MPC5XXX_MAIN_IRQ_BASE));
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out_be32(&intr->main_mask, val);
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} else if (irq < MPC5XXX_PERP_IRQ_BASE) {
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val = in_be32(&sdma->IntMask);
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val |= 1 << (irq - MPC5XXX_SDMA_IRQ_BASE);
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out_be32(&sdma->IntMask, val);
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val = in_be32(&intr->per_mask);
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val |= 1 << (31 - (irq - MPC5XXX_PERP_IRQ_BASE));
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out_be32(&intr->per_mask, val);
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static void mpc5xxx_ic_enable(unsigned int irq)
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if (irq == MPC5XXX_IRQ0) {
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val = in_be32(&intr->ctrl);
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out_be32(&intr->ctrl, val);
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} else if (irq < MPC5XXX_IRQ1) {
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} else if (irq <= MPC5XXX_IRQ3) {
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val = in_be32(&intr->ctrl);
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val |= 1 << (10 - (irq - MPC5XXX_IRQ1));
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out_be32(&intr->ctrl, val);
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} else if (irq < MPC5XXX_SDMA_IRQ_BASE) {
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val = in_be32(&intr->main_mask);
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val &= ~(1 << (16 - (irq - MPC5XXX_MAIN_IRQ_BASE)));
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out_be32(&intr->main_mask, val);
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} else if (irq < MPC5XXX_PERP_IRQ_BASE) {
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val = in_be32(&sdma->IntMask);
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val &= ~(1 << (irq - MPC5XXX_SDMA_IRQ_BASE));
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out_be32(&sdma->IntMask, val);
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val = in_be32(&intr->per_mask);
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val &= ~(1 << (31 - (irq - MPC5XXX_PERP_IRQ_BASE)));
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out_be32(&intr->per_mask, val);
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static void mpc5xxx_ic_ack(unsigned int irq)
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* Only some irqs are reset here, others in interrupting hardware.
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val = in_be32(&intr->ctrl);
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out_be32(&intr->ctrl, val);
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case MPC5XXX_CCS_IRQ:
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val = in_be32(&intr->enc_status);
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out_be32(&intr->enc_status, val);
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val = in_be32(&intr->ctrl);
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out_be32(&intr->ctrl, val);
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val = in_be32(&intr->ctrl);
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out_be32(&intr->ctrl, val);
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val = in_be32(&intr->ctrl);
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out_be32(&intr->ctrl, val);
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if (irq >= MPC5XXX_SDMA_IRQ_BASE
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&& irq < (MPC5XXX_SDMA_IRQ_BASE + MPC5XXX_SDMA_IRQ_NUM)) {
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out_be32(&sdma->IntPend,
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1 << (irq - MPC5XXX_SDMA_IRQ_BASE));
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static void mpc5xxx_ic_disable_and_ack(unsigned int irq)
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mpc5xxx_ic_disable(irq);
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static void mpc5xxx_ic_end(unsigned int irq)
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mpc5xxx_ic_enable(irq);
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void mpc5xxx_init_irq(void)
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/* Remap the necessary zones */
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intr = (struct mpc5xxx_intr *)(MPC5XXX_ICTL);
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sdma = (struct mpc5xxx_sdma *)(MPC5XXX_SDMA);
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/* Disable all interrupt sources. */
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out_be32(&sdma->IntPend, 0xffffffff); /* 1 means clear pending */
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out_be32(&sdma->IntMask, 0xffffffff); /* 1 means disabled */
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out_be32(&intr->per_mask, 0x7ffffc00); /* 1 means disabled */
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out_be32(&intr->main_mask, 0x00010fff); /* 1 means disabled */
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intr_ctrl = in_be32(&intr->ctrl);
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intr_ctrl |= 0x0f000000 | /* clear IRQ 0-3 */
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0x00ff0000 | /* IRQ 0-3 level sensitive low active */
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0x00001000 | /* MEE master external enable */
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0x00000000 | /* 0 means disable IRQ 0-3 */
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0x00000001; /* CEb route critical normally */
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out_be32(&intr->ctrl, intr_ctrl);
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/* Zero a bunch of the priority settings. */
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out_be32(&intr->per_pri1, 0);
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out_be32(&intr->per_pri2, 0);
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out_be32(&intr->per_pri3, 0);
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out_be32(&intr->main_pri1, 0);
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out_be32(&intr->main_pri2, 0);
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int mpc5xxx_get_irq(struct pt_regs *regs)
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status = in_be32(&intr->enc_status);
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if (status & 0x00000400) { /* critical */
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irq = (status >> 8) & 0x3;
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if (irq == 2) /* high priority peripheral */
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irq += MPC5XXX_CRIT_IRQ_BASE;
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} else if (status & 0x00200000) { /* main */
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irq = (status >> 16) & 0x1f;
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if (irq == 4) /* low priority peripheral */
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irq += MPC5XXX_MAIN_IRQ_BASE;
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} else if (status & 0x20000000) { /* peripheral */
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irq = (status >> 24) & 0x1f;
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if (irq == 0) { /* bestcomm */
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status = in_be32(&sdma->IntPend);
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irq = ffs(status) + MPC5XXX_SDMA_IRQ_BASE - 1;
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irq += MPC5XXX_PERP_IRQ_BASE;
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/****************************************************************************/
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int interrupt_init_cpu(ulong * decrementer_count)
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*decrementer_count = get_tbclk() / CONFIG_SYS_HZ;
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/****************************************************************************/
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* Handle external interrupts
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void external_interrupt(struct pt_regs *regs)
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irq = mpc5xxx_get_irq(regs);
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mpc5xxx_ic_disable_and_ack(irq);
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if (irq_handlers[irq].handler != NULL)
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(*irq_handlers[irq].handler) (irq_handlers[irq].arg);
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printf("\nBogus External Interrupt IRQ %d\n", irq);
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* turn off the bogus interrupt, otherwise it
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* might repeat forever
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void timer_interrupt_cpu(struct pt_regs *regs)
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/* nothing to do here */
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/****************************************************************************/
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* Install and free a interrupt handler.
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void irq_install_handler(int irq, interrupt_handler_t * handler, void *arg)
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if (irq < 0 || irq >= NR_IRQS) {
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printf("irq_install_handler: bad irq number %d\n", irq);
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if (irq_handlers[irq].handler != NULL)
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printf("irq_install_handler: 0x%08lx replacing 0x%08lx\n",
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(ulong) handler, (ulong) irq_handlers[irq].handler);
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irq_handlers[irq].handler = handler;
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irq_handlers[irq].arg = arg;
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mpc5xxx_ic_enable(irq);
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void irq_free_handler(int irq)
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if (irq < 0 || irq >= NR_IRQS) {
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printf("irq_free_handler: bad irq number %d\n", irq);
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mpc5xxx_ic_disable(irq);
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irq_handlers[irq].handler = NULL;
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irq_handlers[irq].arg = NULL;
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/****************************************************************************/
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#if defined(CONFIG_CMD_IRQ)
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void do_irqinfo(cmd_tbl_t * cmdtp, bd_t * bd, int flag, int argc, char *argv[])
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char *irq_config[] = { "level sensitive, active high",
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"edge sensitive, rising active edge",
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"edge sensitive, falling active edge",
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"level sensitive, active low"
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re_enable = disable_interrupts();
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intr_ctrl = in_be32(&intr->ctrl);
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printf("Interrupt configuration:\n");
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for (irq = 0; irq <= 3; irq++) {
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printf("IRQ%d: %s\n", irq,
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irq_config[(intr_ctrl >> (22 - 2 * irq)) & 0x3]);
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puts("\nInterrupt-Information:\n" "Nr Routine Arg Count\n");
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for (irq = 0; irq < NR_IRQS; irq++)
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if (irq_handlers[irq].handler != NULL)
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printf("%02d %08lx %08lx %ld\n", irq,
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(ulong) irq_handlers[irq].handler,
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(ulong) irq_handlers[irq].arg,
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irq_handlers[irq].count);