305 lines
6.3 KiB
C
305 lines
6.3 KiB
C
/*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Marius Groeger <mgroeger@sysgo.de>
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*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Alex Zuepke <azu@sysgo.de>
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*
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* (C) Copyright 2002
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* Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
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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 <arm920t.h>
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#if defined(CONFIG_S3C2400)
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#include <s3c2400.h>
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#elif defined(CONFIG_S3C2410)
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#include <s3c2410.h>
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#endif
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#include <asm/proc-armv/ptrace.h>
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extern void reset_cpu(ulong addr);
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int timer_load_val = 0;
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/* macro to read the 16 bit timer */
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#define READ_TIMER (rTCNTO4 & 0xffff)
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#ifdef CONFIG_USE_IRQ
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/* enable IRQ interrupts */
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void enable_interrupts (void)
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{
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unsigned long temp;
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__asm__ __volatile__("mrs %0, cpsr\n"
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"bic %0, %0, #0x80\n"
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"msr cpsr_c, %0"
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: "=r" (temp)
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:
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: "memory");
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}
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/*
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* disable IRQ/FIQ interrupts
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* returns true if interrupts had been enabled before we disabled them
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*/
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int disable_interrupts (void)
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{
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unsigned long old,temp;
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__asm__ __volatile__("mrs %0, cpsr\n"
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"orr %1, %0, #0xc0\n"
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"msr cpsr_c, %1"
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: "=r" (old), "=r" (temp)
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:
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: "memory");
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return (old & 0x80) == 0;
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}
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#else
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void enable_interrupts (void)
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{
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return;
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}
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int disable_interrupts (void)
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{
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return 0;
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}
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#endif
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void bad_mode (void)
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{
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panic ("Resetting CPU ...\n");
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reset_cpu (0);
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}
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void show_regs (struct pt_regs *regs)
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{
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unsigned long flags;
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const char *processor_modes[] = {
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"USER_26", "FIQ_26", "IRQ_26", "SVC_26",
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"UK4_26", "UK5_26", "UK6_26", "UK7_26",
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"UK8_26", "UK9_26", "UK10_26", "UK11_26",
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"UK12_26", "UK13_26", "UK14_26", "UK15_26",
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"USER_32", "FIQ_32", "IRQ_32", "SVC_32",
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"UK4_32", "UK5_32", "UK6_32", "ABT_32",
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"UK8_32", "UK9_32", "UK10_32", "UND_32",
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"UK12_32", "UK13_32", "UK14_32", "SYS_32",
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};
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flags = condition_codes (regs);
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printf ("pc : [<%08lx>] lr : [<%08lx>]\n"
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"sp : %08lx ip : %08lx fp : %08lx\n",
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instruction_pointer (regs),
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regs->ARM_lr, regs->ARM_sp, regs->ARM_ip, regs->ARM_fp);
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printf ("r10: %08lx r9 : %08lx r8 : %08lx\n",
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regs->ARM_r10, regs->ARM_r9, regs->ARM_r8);
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printf ("r7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n",
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regs->ARM_r7, regs->ARM_r6, regs->ARM_r5, regs->ARM_r4);
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printf ("r3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n",
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regs->ARM_r3, regs->ARM_r2, regs->ARM_r1, regs->ARM_r0);
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printf ("Flags: %c%c%c%c",
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flags & CC_N_BIT ? 'N' : 'n',
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flags & CC_Z_BIT ? 'Z' : 'z',
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flags & CC_C_BIT ? 'C' : 'c', flags & CC_V_BIT ? 'V' : 'v');
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printf (" IRQs %s FIQs %s Mode %s%s\n",
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interrupts_enabled (regs) ? "on" : "off",
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fast_interrupts_enabled (regs) ? "on" : "off",
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processor_modes[processor_mode (regs)],
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thumb_mode (regs) ? " (T)" : "");
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}
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void do_undefined_instruction (struct pt_regs *pt_regs)
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{
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printf ("undefined instruction\n");
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show_regs (pt_regs);
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bad_mode ();
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}
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void do_software_interrupt (struct pt_regs *pt_regs)
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{
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printf ("software interrupt\n");
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show_regs (pt_regs);
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bad_mode ();
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}
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void do_prefetch_abort (struct pt_regs *pt_regs)
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{
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printf ("prefetch abort\n");
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show_regs (pt_regs);
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bad_mode ();
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}
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void do_data_abort (struct pt_regs *pt_regs)
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{
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printf ("data abort\n");
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show_regs (pt_regs);
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bad_mode ();
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}
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void do_not_used (struct pt_regs *pt_regs)
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{
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printf ("not used\n");
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show_regs (pt_regs);
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bad_mode ();
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}
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void do_fiq (struct pt_regs *pt_regs)
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{
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printf ("fast interrupt request\n");
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show_regs (pt_regs);
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bad_mode ();
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}
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void do_irq (struct pt_regs *pt_regs)
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{
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printf ("interrupt request\n");
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show_regs (pt_regs);
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bad_mode ();
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}
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static ulong timestamp;
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static ulong lastdec;
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int interrupt_init (void)
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{
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/* use PWM Timer 4 because it has no output */
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/* prescaler for Timer 4 is 16 */
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rTCFG0 = 0x0f00;
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if (timer_load_val == 0)
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{
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/*
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* for 10 ms clock period @ PCLK with 4 bit divider = 1/2
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* (default) and prescaler = 16. Should be 10390
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* @33.25MHz and 15625 @ 50 MHz
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*/
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timer_load_val = get_PCLK()/(2 * 16 * 100);
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}
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/* load value for 10 ms timeout */
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lastdec = rTCNTB4 = timer_load_val;
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/* auto load, manual update of Timer 4 */
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rTCON = 0x600000;
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/* auto load, start Timer 4 */
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rTCON = 0x500000;
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timestamp = 0;
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return (0);
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}
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/*
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* timer without interrupts
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*/
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void reset_timer (void)
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{
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reset_timer_masked ();
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}
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ulong get_timer (ulong base)
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{
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return get_timer_masked () - 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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void udelay (unsigned long usec)
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{
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ulong tmo;
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tmo = usec / 1000;
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tmo *= (timer_load_val * 100);
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tmo /= 1000;
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tmo += get_timer (0);
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while (get_timer_masked () < tmo)
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/*NOP*/;
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}
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void reset_timer_masked (void)
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{
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/* reset time */
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lastdec = READ_TIMER;
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timestamp = 0;
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}
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ulong get_timer_masked (void)
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{
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ulong now = READ_TIMER;
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if (lastdec >= now) {
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/* normal mode */
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timestamp += lastdec - now;
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} else {
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/* we have an overflow ... */
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timestamp += lastdec + timer_load_val - now;
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}
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lastdec = now;
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return timestamp;
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}
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void udelay_masked (unsigned long usec)
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{
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ulong tmo;
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tmo = usec / 1000;
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tmo *= (timer_load_val * 100);
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tmo /= 1000;
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reset_timer_masked ();
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while (get_timer_masked () < tmo)
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/*NOP*/;
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}
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/*
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* This function is derived from PowerPC code (read timebase as long long).
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* On ARM it just returns the timer value.
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*/
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unsigned long long get_ticks(void)
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{
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return get_timer(0);
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}
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/*
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* This function is derived from PowerPC code (timebase clock frequency).
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* On ARM it returns the number of timer ticks per second.
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*/
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ulong get_tbclk (void)
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{
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ulong tbclk;
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#if defined(CONFIG_SMDK2400) || defined(CONFIG_TRAB)
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tbclk = timer_load_val * 100;
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#elif defined(CONFIG_SMDK2410)
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tbclk = CFG_HZ;
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#endif
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return tbclk;
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}
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