mirror of https://gitee.com/openkylin/linux.git
135 lines
3.4 KiB
C
135 lines
3.4 KiB
C
/* MN2WS0050 processor initialisation
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*
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* Copyright (C) 2005 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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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
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <asm/processor.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#include <asm/io.h>
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#include <linux/atomic.h>
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#include <asm/smp.h>
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#include <asm/pgalloc.h>
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#include <asm/busctl-regs.h>
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#include <unit/timex.h>
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#include <asm/fpu.h>
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#include <asm/rtc.h>
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#define MEMCONF __SYSREGC(0xdf800400, u32)
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/*
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* initialise the on-silicon processor peripherals
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*/
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asmlinkage void __init processor_init(void)
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{
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int loop;
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/* set up the exception table first */
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for (loop = 0x000; loop < 0x400; loop += 8)
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__set_intr_stub(loop, __common_exception);
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__set_intr_stub(EXCEP_ITLBMISS, itlb_miss);
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__set_intr_stub(EXCEP_DTLBMISS, dtlb_miss);
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__set_intr_stub(EXCEP_IAERROR, itlb_aerror);
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__set_intr_stub(EXCEP_DAERROR, dtlb_aerror);
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__set_intr_stub(EXCEP_BUSERROR, raw_bus_error);
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__set_intr_stub(EXCEP_DOUBLE_FAULT, double_fault);
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__set_intr_stub(EXCEP_FPU_DISABLED, fpu_disabled);
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__set_intr_stub(EXCEP_SYSCALL0, system_call);
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__set_intr_stub(EXCEP_NMI, nmi_handler);
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__set_intr_stub(EXCEP_WDT, nmi_handler);
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__set_intr_stub(EXCEP_IRQ_LEVEL0, irq_handler);
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__set_intr_stub(EXCEP_IRQ_LEVEL1, irq_handler);
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__set_intr_stub(EXCEP_IRQ_LEVEL2, irq_handler);
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__set_intr_stub(EXCEP_IRQ_LEVEL3, irq_handler);
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__set_intr_stub(EXCEP_IRQ_LEVEL4, irq_handler);
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__set_intr_stub(EXCEP_IRQ_LEVEL5, irq_handler);
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__set_intr_stub(EXCEP_IRQ_LEVEL6, irq_handler);
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IVAR0 = EXCEP_IRQ_LEVEL0;
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IVAR1 = EXCEP_IRQ_LEVEL1;
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IVAR2 = EXCEP_IRQ_LEVEL2;
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IVAR3 = EXCEP_IRQ_LEVEL3;
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IVAR4 = EXCEP_IRQ_LEVEL4;
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IVAR5 = EXCEP_IRQ_LEVEL5;
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IVAR6 = EXCEP_IRQ_LEVEL6;
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#ifndef CONFIG_MN10300_HAS_CACHE_SNOOP
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mn10300_dcache_flush_inv();
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mn10300_icache_inv();
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#endif
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/* disable all interrupts and set to priority 6 (lowest) */
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#ifdef CONFIG_SMP
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for (loop = 0; loop < GxICR_NUM_IRQS; loop++)
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GxICR(loop) = GxICR_LEVEL_6 | GxICR_DETECT;
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#else /* !CONFIG_SMP */
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for (loop = 0; loop < NR_IRQS; loop++)
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GxICR(loop) = GxICR_LEVEL_6 | GxICR_DETECT;
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#endif /* !CONFIG_SMP */
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/* clear the timers */
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TM0MD = 0;
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TM1MD = 0;
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TM2MD = 0;
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TM3MD = 0;
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TM4MD = 0;
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TM5MD = 0;
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TM6MD = 0;
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TM6MDA = 0;
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TM6MDB = 0;
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TM7MD = 0;
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TM8MD = 0;
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TM9MD = 0;
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TM10MD = 0;
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TM11MD = 0;
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TM12MD = 0;
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TM13MD = 0;
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TM14MD = 0;
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TM15MD = 0;
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calibrate_clock();
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}
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/*
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* determine the memory size and base from the memory controller regs
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*/
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void __init get_mem_info(unsigned long *mem_base, unsigned long *mem_size)
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{
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unsigned long memconf = MEMCONF;
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unsigned long size = 0; /* order: MByte */
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*mem_base = 0x90000000; /* fixed address */
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switch (memconf & 0x00000003) {
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case 0x01:
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size = 256 / 8; /* 256 Mbit per chip */
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break;
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case 0x02:
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size = 512 / 8; /* 512 Mbit per chip */
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break;
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case 0x03:
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size = 1024 / 8; /* 1 Gbit per chip */
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break;
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default:
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panic("Invalid SDRAM size");
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break;
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}
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printk(KERN_INFO "DDR2-SDRAM: %luMB x 2 @%08lx\n", size, *mem_base);
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*mem_size = (size * 2) << 20;
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}
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