cpu/at91rm9200/interrupts.c

   1 /*
   2  * (C) Copyright 2002
   3  * Lineo, Inc. <www.lineo.com>
   4  * Bernhard Kuhn <bkuhn@lineo.com>
   5  *
   6  * (C) Copyright 2002
   7  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   8  * Marius Groeger <mgroeger@sysgo.de>
   9  *
  10  * (C) Copyright 2002
  11  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
  12  * Alex Zuepke <azu@sysgo.de>
  13  *
  14  * See file CREDITS for list of people who contributed to this
  15  * project.
  16  *
  17  * This program is free software; you can redistribute it and/or
  18  * modify it under the terms of the GNU General Public License as
  19  * published by the Free Software Foundation; either version 2 of
  20  * the License, or (at your option) any later version.
  21  *
  22  * This program is distributed in the hope that it will be useful,
  23  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25  * GNU General Public License for more details.
  26  *
  27  * You should have received a copy of the GNU General Public License
  28  * along with this program; if not, write to the Free Software
  29  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  30  * MA 02111-1307 USA
  31  */
  32
  33 #include <common.h>
  34 #include <asm/io.h>
  35 #include <asm/proc-armv/ptrace.h>
  36
  37 extern void reset_cpu(ulong addr);
  38
  39 /* we always count down the max. */
  40 #define TIMER_LOAD_VAL 0xffff
  41
  42 /* macro to read the 16 bit timer */
  43 #define READ_TIMER (tmr->TC_CV)
  44 AT91PS_TC tmr;
  45
  46
  47
  48 void enable_interrupts (void)
  49 {
  50     return;
  51 }
  52 int disable_interrupts (void)
  53 {
  54     return 0;
  55 }
  56
  57
  58 void bad_mode(void)
  59 {
  60     panic("Resetting CPU ...\n");
  61     reset_cpu(0);
  62 }
  63
  64 void show_regs(struct pt_regs * regs)
  65 {
  66     unsigned long flags;
  67 const char *processor_modes[]=
  68 { "USER_26", "FIQ_26" , "IRQ_26" , "SVC_26" , "UK4_26" , "UK5_26" , "UK6_26" , "UK7_26" ,
  69   "UK8_26" , "UK9_26" , "UK10_26", "UK11_26", "UK12_26", "UK13_26", "UK14_26", "UK15_26",
  70   "USER_32", "FIQ_32" , "IRQ_32" , "SVC_32" , "UK4_32" , "UK5_32" , "UK6_32" , "ABT_32" ,
  71   "UK8_32" , "UK9_32" , "UK10_32", "UND_32" , "UK12_32", "UK13_32", "UK14_32", "SYS_32"
  72 };
  73
  74     flags = condition_codes(regs);
  75
  76     printf("pc : [<%08lx>]    lr : [<%08lx>]\n"
  77            "sp : %08lx  ip : %08lx  fp : %08lx\n",
  78            instruction_pointer(regs),
  79            regs->ARM_lr, regs->ARM_sp,
  80            regs->ARM_ip, regs->ARM_fp);
  81     printf("r10: %08lx  r9 : %08lx  r8 : %08lx\n",
  82            regs->ARM_r10, regs->ARM_r9,
  83            regs->ARM_r8);
  84     printf("r7 : %08lx  r6 : %08lx  r5 : %08lx  r4 : %08lx\n",
  85            regs->ARM_r7, regs->ARM_r6,
  86            regs->ARM_r5, regs->ARM_r4);
  87     printf("r3 : %08lx  r2 : %08lx  r1 : %08lx  r0 : %08lx\n",
  88            regs->ARM_r3, regs->ARM_r2,
  89            regs->ARM_r1, regs->ARM_r0);
  90     printf("Flags: %c%c%c%c",
  91            flags & CC_N_BIT ? 'N' : 'n',
  92            flags & CC_Z_BIT ? 'Z' : 'z',
  93            flags & CC_C_BIT ? 'C' : 'c',
  94            flags & CC_V_BIT ? 'V' : 'v');
  95     printf("  IRQs %s  FIQs %s  Mode %s%s\n",
  96            interrupts_enabled(regs) ? "on" : "off",
  97            fast_interrupts_enabled(regs) ? "on" : "off",
  98            processor_modes[processor_mode(regs)],
  99            thumb_mode(regs) ? " (T)" : "");
 100 }
 101
 102 void do_undefined_instruction(struct pt_regs *pt_regs)
 103 {
 104     printf("undefined instruction\n");
 105     show_regs(pt_regs);
 106     bad_mode();
 107 }
 108
 109 void do_software_interrupt(struct pt_regs *pt_regs)
 110 {
 111     printf("software interrupt\n");
 112     show_regs(pt_regs);
 113     bad_mode();
 114 }
 115
 116 void do_prefetch_abort(struct pt_regs *pt_regs)
 117 {
 118     printf("prefetch abort\n");
 119     show_regs(pt_regs);
 120     bad_mode();
 121 }
 122
 123 void do_data_abort(struct pt_regs *pt_regs)
 124 {
 125     printf("data abort\n");
 126     show_regs(pt_regs);
 127     bad_mode();
 128 }
 129
 130 void do_not_used(struct pt_regs *pt_regs)
 131 {
 132     printf("not used\n");
 133     show_regs(pt_regs);
 134     bad_mode();
 135 }
 136
 137 void do_fiq(struct pt_regs *pt_regs)
 138 {
 139     printf("fast interrupt request\n");
 140     show_regs(pt_regs);
 141     bad_mode();
 142 }
 143
 144 void do_irq(struct pt_regs *pt_regs)
 145 {
 146     printf("interrupt request\n");
 147     show_regs(pt_regs);
 148     bad_mode();
 149 }
 150
 151 static ulong timestamp;
 152 static ulong lastinc;
 153
 154 int interrupt_init (void)
 155 {
 156
 157     tmr = AT91C_BASE_TC0;
 158
 159     /* enables TC1.0 clock */
 160     *AT91C_PMC_PCER = 1 << AT91C_ID_TC0;  /* enable clock */
 161
 162     *AT91C_TCB0_BCR = 0;
 163     *AT91C_TCB0_BMR = AT91C_TCB_TC0XC0S_NONE | AT91C_TCB_TC1XC1S_NONE | AT91C_TCB_TC2XC2S_NONE;
 164     tmr->TC_CCR = AT91C_TC_CLKDIS;
 165     tmr->TC_CMR = AT91C_TC_TIMER_DIV1_CLOCK;  /* set to MCLK/2 */
 166
 167     tmr->TC_IDR = ~0ul;
 168     tmr->TC_RC = TIMER_LOAD_VAL;
 169     lastinc = TIMER_LOAD_VAL;
 170     tmr->TC_CCR = AT91C_TC_SWTRG | AT91C_TC_CLKEN;
 171     timestamp = 0;
 172     return (0);
 173 }
 174
 175 /*
 176  * timer without interrupts
 177  */
 178
 179 void reset_timer(void)
 180 {
 181     reset_timer_masked();
 182 }
 183
 184 ulong get_timer (ulong base)
 185 {
 186     return get_timer_masked() - base;
 187 }
 188
 189 void set_timer (ulong t)
 190 {
 191     timestamp = t;
 192 }
 193
 194 void udelay(unsigned long usec)
 195 {
 196     udelay_masked(usec);
 197 }
 198
 199 void reset_timer_masked(void)
 200 {
 201     /* reset time */
 202     lastinc = READ_TIMER;
 203     timestamp = 0;
 204 }
 205
 206 ulong get_timer_masked(void)
 207 {
 208     ulong now = READ_TIMER;
 209     if (now >= lastinc)
 210     {
 211         /* normal mode */
 212         timestamp += now - lastinc;
 213     } else {
 214         /* we have an overflow ... */
 215         timestamp += now + TIMER_LOAD_VAL - lastinc;
 216     }
 217     lastinc = now;
 218
 219     return timestamp;
 220 }
 221
 222 void udelay_masked(unsigned long usec)
 223 {
 224     ulong tmo;
 225
 226     tmo = usec / 1000;
 227     tmo *= CFG_HZ;
 228     tmo /= 1000;
 229
 230     reset_timer_masked();
 231
 232     while(get_timer_masked() < tmo);
 233       /*NOP*/;
 234 }
 235
 236