interrupts.c

/*
 * (C) Copyright 2000-2002
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * (C) Copyright 2002 (440 port)
 * Scott McNutt, Artesyn Communication Producs, smcnutt@artsyncp.com
 *
 * (C) Copyright 2003 Motorola Inc. (MPC85xx port)
 * Xianghua Xiao (X.Xiao@motorola.com)
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <watchdog.h>
#include <command.h>
#include <asm/processor.h>
#include <asm/io.h>
#ifdef CONFIG_POST
#include <post.h>
#endif

int interrupt_init_cpu(unsigned int *decrementer_count)
{
	ccsr_pic_t __iomem *pic = (void *)CONFIG_SYS_MPC8xxx_PIC_ADDR;

#ifdef CONFIG_POST
	/*
	 * The POST word is stored in the PIC's TFRR register which gets
	 * cleared when the PIC is reset.  Save it off so we can restore it
	 * later.
	 */
	ulong post_word = post_word_load();
#endif

	out_be32(&pic->gcr, MPC85xx_PICGCR_RST);
	while (in_be32(&pic->gcr) & MPC85xx_PICGCR_RST)
		;
	out_be32(&pic->gcr, MPC85xx_PICGCR_M);
	in_be32(&pic->gcr);

	*decrementer_count = get_tbclk() / CONFIG_SYS_HZ;

	/* PIE is same as DIE, dec interrupt enable */
	mtspr(SPRN_TCR, mfspr(SPRN_TCR) | TCR_PIE);

#ifdef CONFIG_INTERRUPTS
	pic->iivpr1 = 0x810001;	/* 50220 enable ecm interrupts */
	debug("iivpr1@%x = %x\n", (uint)&pic->iivpr1, pic->iivpr1);

	pic->iivpr2 = 0x810002;	/* 50240 enable ddr interrupts */
	debug("iivpr2@%x = %x\n", (uint)&pic->iivpr2, pic->iivpr2);

	pic->iivpr3 = 0x810003;	/* 50260 enable lbc interrupts */
	debug("iivpr3@%x = %x\n", (uint)&pic->iivpr3, pic->iivpr3);

#ifdef CONFIG_PCI1
	pic->iivpr8 = 0x810008;	/* enable pci1 interrupts */
	debug("iivpr8@%x = %x\n", (uint)&pic->iivpr8, pic->iivpr8);
#endif
#if defined(CONFIG_PCI2) || defined(CONFIG_PCIE2)
	pic->iivpr9 = 0x810009;	/* enable pci1 interrupts */
	debug("iivpr9@%x = %x\n", (uint)&pic->iivpr9, pic->iivpr9);
#endif
#ifdef CONFIG_PCIE1
	pic->iivpr10 = 0x81000a;	/* enable pcie1 interrupts */
	debug("iivpr10@%x = %x\n", (uint)&pic->iivpr10, pic->iivpr10);
#endif
#ifdef CONFIG_PCIE3
	pic->iivpr11 = 0x81000b;	/* enable pcie3 interrupts */
	debug("iivpr11@%x = %x\n", (uint)&pic->iivpr11, pic->iivpr11);
#endif

	pic->ctpr=0;		/* 40080 clear current task priority register */
#endif

#ifdef CONFIG_POST
	post_word_store(post_word);
#endif

	return (0);
}

/* Install and free a interrupt handler. Not implemented yet. */

void
irq_install_handler(int vec, interrupt_handler_t *handler, void *arg)
{
	return;
}

void
irq_free_handler(int vec)
{
	return;
}

void timer_interrupt_cpu(struct pt_regs *regs)
{
	/* PIS is same as DIS, dec interrupt status */
	mtspr(SPRN_TSR, TSR_PIS);
}

#if defined(CONFIG_CMD_IRQ)
/* irqinfo - print information about PCI devices,not implemented. */
int do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
	return 0;
}
#endif