Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
proc-init.c
Go to the documentation of this file.
1 /* MN2WS0050 processor initialisation
2  *
3  * Copyright (C) 2005 Red Hat, Inc. All Rights Reserved.
4  * Written by David Howells ([email protected])
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License
8  * as published by the Free Software Foundation; either version
9  * 2 of the License, or (at your option) any later version.
10  */
11 #include <linux/sched.h>
12 #include <linux/kernel.h>
13 #include <linux/init.h>
14 #include <linux/delay.h>
15 #include <linux/interrupt.h>
16 
17 #include <asm/processor.h>
18 #include <asm/uaccess.h>
19 #include <asm/io.h>
20 #include <linux/atomic.h>
21 #include <asm/smp.h>
22 #include <asm/pgalloc.h>
23 #include <asm/busctl-regs.h>
24 #include <unit/timex.h>
25 #include <asm/fpu.h>
26 #include <asm/rtc.h>
27 
28 #define MEMCONF __SYSREGC(0xdf800400, u32)
29 
30 /*
31  * initialise the on-silicon processor peripherals
32  */
33 asmlinkage void __init processor_init(void)
34 {
35  int loop;
36 
37  /* set up the exception table first */
38  for (loop = 0x000; loop < 0x400; loop += 8)
39  __set_intr_stub(loop, __common_exception);
40 
41  __set_intr_stub(EXCEP_ITLBMISS, itlb_miss);
42  __set_intr_stub(EXCEP_DTLBMISS, dtlb_miss);
43  __set_intr_stub(EXCEP_IAERROR, itlb_aerror);
44  __set_intr_stub(EXCEP_DAERROR, dtlb_aerror);
45  __set_intr_stub(EXCEP_BUSERROR, raw_bus_error);
46  __set_intr_stub(EXCEP_DOUBLE_FAULT, double_fault);
47  __set_intr_stub(EXCEP_FPU_DISABLED, fpu_disabled);
48  __set_intr_stub(EXCEP_SYSCALL0, system_call);
49 
50  __set_intr_stub(EXCEP_NMI, nmi_handler);
51  __set_intr_stub(EXCEP_WDT, nmi_handler);
52  __set_intr_stub(EXCEP_IRQ_LEVEL0, irq_handler);
53  __set_intr_stub(EXCEP_IRQ_LEVEL1, irq_handler);
54  __set_intr_stub(EXCEP_IRQ_LEVEL2, irq_handler);
55  __set_intr_stub(EXCEP_IRQ_LEVEL3, irq_handler);
56  __set_intr_stub(EXCEP_IRQ_LEVEL4, irq_handler);
57  __set_intr_stub(EXCEP_IRQ_LEVEL5, irq_handler);
58  __set_intr_stub(EXCEP_IRQ_LEVEL6, irq_handler);
59 
60  IVAR0 = EXCEP_IRQ_LEVEL0;
61  IVAR1 = EXCEP_IRQ_LEVEL1;
62  IVAR2 = EXCEP_IRQ_LEVEL2;
63  IVAR3 = EXCEP_IRQ_LEVEL3;
64  IVAR4 = EXCEP_IRQ_LEVEL4;
65  IVAR5 = EXCEP_IRQ_LEVEL5;
66  IVAR6 = EXCEP_IRQ_LEVEL6;
67 
68 #ifndef CONFIG_MN10300_HAS_CACHE_SNOOP
69  mn10300_dcache_flush_inv();
70  mn10300_icache_inv();
71 #endif
72 
73  /* disable all interrupts and set to priority 6 (lowest) */
74 #ifdef CONFIG_SMP
75  for (loop = 0; loop < GxICR_NUM_IRQS; loop++)
76  GxICR(loop) = GxICR_LEVEL_6 | GxICR_DETECT;
77 #else /* !CONFIG_SMP */
78  for (loop = 0; loop < NR_IRQS; loop++)
79  GxICR(loop) = GxICR_LEVEL_6 | GxICR_DETECT;
80 #endif /* !CONFIG_SMP */
81 
82  /* clear the timers */
83  TM0MD = 0;
84  TM1MD = 0;
85  TM2MD = 0;
86  TM3MD = 0;
87  TM4MD = 0;
88  TM5MD = 0;
89  TM6MD = 0;
90  TM6MDA = 0;
91  TM6MDB = 0;
92  TM7MD = 0;
93  TM8MD = 0;
94  TM9MD = 0;
95  TM10MD = 0;
96  TM11MD = 0;
97  TM12MD = 0;
98  TM13MD = 0;
99  TM14MD = 0;
100  TM15MD = 0;
101 
102  calibrate_clock();
103 }
104 
105 /*
106  * determine the memory size and base from the memory controller regs
107  */
108 void __init get_mem_info(unsigned long *mem_base, unsigned long *mem_size)
109 {
110  unsigned long memconf = MEMCONF;
111  unsigned long size = 0; /* order: MByte */
112 
113  *mem_base = 0x90000000; /* fixed address */
114 
115  switch (memconf & 0x00000003) {
116  case 0x01:
117  size = 256 / 8; /* 256 Mbit per chip */
118  break;
119  case 0x02:
120  size = 512 / 8; /* 512 Mbit per chip */
121  break;
122  case 0x03:
123  size = 1024 / 8; /* 1 Gbit per chip */
124  break;
125  default:
126  panic("Invalid SDRAM size");
127  break;
128  }
129 
130  printk(KERN_INFO "DDR2-SDRAM: %luMB x 2 @%08lx\n", size, *mem_base);
131 
132  *mem_size = (size * 2) << 20;
133 }
Generated on Thu Jan 10 2013 13:12:34 for Linux Kernel by   doxygen 1.8.2