arch/mn10300/proc-mn103e010/proc-init.c

   1 /* MN103E010 Processor initialisation
   2  *
   3  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public Licence
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the Licence, or (at your option) any later version.
  10  */
  11 #include <linux/kernel.h>
  12 #include <asm/fpu.h>
  13 #include <asm/rtc.h>
  14 #include <asm/busctl-regs.h>
  15
  16 /*
  17  * initialise the on-silicon processor peripherals
  18  */
  19 asmlinkage void __init processor_init(void)
  20 {
  21         int loop;
  22
  23         /* set up the exception table first */
  24         for (loop = 0x000; loop < 0x400; loop += 8)
  25                 __set_intr_stub(loop, __common_exception);
  26
  27         __set_intr_stub(EXCEP_ITLBMISS,         itlb_miss);
  28         __set_intr_stub(EXCEP_DTLBMISS,         dtlb_miss);
  29         __set_intr_stub(EXCEP_IAERROR,          itlb_aerror);
  30         __set_intr_stub(EXCEP_DAERROR,          dtlb_aerror);
  31         __set_intr_stub(EXCEP_BUSERROR,         raw_bus_error);
  32         __set_intr_stub(EXCEP_DOUBLE_FAULT,     double_fault);
  33         __set_intr_stub(EXCEP_FPU_DISABLED,     fpu_disabled);
  34         __set_intr_stub(EXCEP_SYSCALL0,         system_call);
  35
  36         __set_intr_stub(EXCEP_NMI,              nmi_handler);
  37         __set_intr_stub(EXCEP_WDT,              nmi_handler);
  38         __set_intr_stub(EXCEP_IRQ_LEVEL0,       irq_handler);
  39         __set_intr_stub(EXCEP_IRQ_LEVEL1,       irq_handler);
  40         __set_intr_stub(EXCEP_IRQ_LEVEL2,       irq_handler);
  41         __set_intr_stub(EXCEP_IRQ_LEVEL3,       irq_handler);
  42         __set_intr_stub(EXCEP_IRQ_LEVEL4,       irq_handler);
  43         __set_intr_stub(EXCEP_IRQ_LEVEL5,       irq_handler);
  44         __set_intr_stub(EXCEP_IRQ_LEVEL6,       irq_handler);
  45
  46         IVAR0 = EXCEP_IRQ_LEVEL0;
  47         IVAR1 = EXCEP_IRQ_LEVEL1;
  48         IVAR2 = EXCEP_IRQ_LEVEL2;
  49         IVAR3 = EXCEP_IRQ_LEVEL3;
  50         IVAR4 = EXCEP_IRQ_LEVEL4;
  51         IVAR5 = EXCEP_IRQ_LEVEL5;
  52         IVAR6 = EXCEP_IRQ_LEVEL6;
  53
  54         mn10300_dcache_flush_inv();
  55         mn10300_icache_inv();
  56
  57         /* disable all interrupts and set to priority 6 (lowest) */
  58         for (loop = 0; loop < NR_IRQS; loop++)
  59                 GxICR(loop) = GxICR_LEVEL_6 | GxICR_DETECT;
  60
  61         /* clear the timers */
  62         TM0MD   = 0;
  63         TM1MD   = 0;
  64         TM2MD   = 0;
  65         TM3MD   = 0;
  66         TM4MD   = 0;
  67         TM5MD   = 0;
  68         TM6MD   = 0;
  69         TM6MDA  = 0;
  70         TM6MDB  = 0;
  71         TM7MD   = 0;
  72         TM8MD   = 0;
  73         TM9MD   = 0;
  74         TM10MD  = 0;
  75         TM11MD  = 0;
  76
  77         calibrate_clock();
  78 }
  79
  80 /*
  81  * determine the memory size and base from the memory controller regs
  82  */
  83 void __init get_mem_info(unsigned long *mem_base, unsigned long *mem_size)
  84 {
  85         unsigned long base, size;
  86
  87         *mem_base = 0;
  88         *mem_size = 0;
  89
  90         base = SDBASE(0);
  91         if (base & SDBASE_CE) {
  92                 size = (base & SDBASE_CBAM) << SDBASE_CBAM_SHIFT;
  93                 size = ~size + 1;
  94                 base &= SDBASE_CBA;
  95
  96                 printk(KERN_INFO "SDRAM[0]: %luMb @%08lx\n", size >> 20, base);
  97                 *mem_size += size;
  98                 *mem_base = base;
  99         }
 100
 101         base = SDBASE(1);
 102         if (base & SDBASE_CE) {
 103                 size = (base & SDBASE_CBAM) << SDBASE_CBAM_SHIFT;
 104                 size = ~size + 1;
 105                 base &= SDBASE_CBA;
 106
 107                 printk(KERN_INFO "SDRAM[1]: %luMb @%08lx\n", size >> 20, base);
 108                 *mem_size += size;
 109                 if (*mem_base == 0)
 110                         *mem_base = base;
 111         }
 112 }