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/*
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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, 2007 Freescale Semiconductor. (MPC86xx Port)
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* Jeff Brown
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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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#include <watchdog.h>
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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 long *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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volatile immap_t *immr = (immap_t *)CFG_IMMR;
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immr->im_pic.gcr = MPC86xx_PICGCR_RST;
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while (immr->im_pic.gcr & MPC86xx_PICGCR_RST);
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immr->im_pic.gcr = MPC86xx_PICGCR_MODE;
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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 = %ld\n",
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(get_tbclk() / 1000000),
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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",
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get_msr(),
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get_dec());
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#ifdef CONFIG_INTERRUPTS
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volatile ccsr_pic_t *pic = &immr->im_pic;
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pic->iivpr1 = 0x810001; /* 50220 enable mcm interrupts */
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debug("iivpr1@%x = %x\n", &pic->iivpr1, pic->iivpr1);
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pic->iivpr2 = 0x810002; /* 50240 enable ddr interrupts */
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debug("iivpr2@%x = %x\n", &pic->iivpr2, pic->iivpr2);
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pic->iivpr3 = 0x810003; /* 50260 enable lbc interrupts */
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debug("iivpr3@%x = %x\n", &pic->iivpr3, pic->iivpr3);
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#if defined(CONFIG_PCI1) || defined(CONFIG_PCIE1)
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pic->iivpr8 = 0x810008; /* enable pcie1 interrupts */
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debug("iivpr8@%x = %x\n", &pic->iivpr8, pic->iivpr8);
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#endif
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#if defined(CONFIG_PCI2) || defined(CONFIG_PCIE2)
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pic->iivpr9 = 0x810009; /* enable pcie2 interrupts */
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debug("iivpr9@%x = %x\n", &pic->iivpr9, pic->iivpr9);
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#endif
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pic->ctpr = 0; /* 40080 clear current task priority register */
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#endif
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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 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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/* 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 irq_install_handler(int vec, interrupt_handler_t *handler, void *arg)
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{
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}
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void irq_free_handler(int vec)
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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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int 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 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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