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![Dirk Behme](/assets/img/avatar_default.png)
Add common board, interrupt and system info code. Signed-off-by: Dirk Behme <dirk.behme@googlemail.com>
298 lines
7.2 KiB
C
298 lines
7.2 KiB
C
/*
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* (C) Copyright 2008
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* Texas Instruments
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*
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* Richard Woodruff <r-woodruff2@ti.com>
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* Syed Moahmmed Khasim <khasim@ti.com>
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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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* Marius Groeger <mgroeger@sysgo.de>
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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 <asm/io.h>
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#include <asm/proc-armv/ptrace.h>
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#define TIMER_LOAD_VAL 0
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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" "msr cpsr_c, %0":"=r"(temp)
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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":"=r"(old), "=r"(temp)
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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 lastinc;
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static gptimer_t *timer_base = (gptimer_t *)CONFIG_SYS_TIMERBASE;
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/* nothing really to do with interrupts, just starts up a counter. */
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int interrupt_init(void)
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{
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/* start the counter ticking up, reload value on overflow */
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writel(TIMER_LOAD_VAL, &timer_base->tldr);
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/* enable timer */
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writel((CONFIG_SYS_PVT << 2) | TCLR_PRE | TCLR_AR | TCLR_ST,
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&timer_base->tclr);
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reset_timer_masked(); /* init the timestamp and lastinc value */
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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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/* delay x useconds AND perserve advance timstamp value */
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void udelay(unsigned long usec)
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{
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ulong tmo, tmp;
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/* if "big" number, spread normalization to seconds */
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if (usec >= 1000) {
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/* if "big" number, spread normalization to seconds */
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tmo = usec / 1000;
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/* find number of "ticks" to wait to achieve target */
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tmo *= CONFIG_SYS_HZ;
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tmo /= 1000; /* finish normalize. */
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} else {/* else small number, don't kill it prior to HZ multiply */
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tmo = usec * CONFIG_SYS_HZ;
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tmo /= (1000 * 1000);
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}
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tmp = get_timer(0); /* get current timestamp */
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/* if setting this forward will roll time stamp */
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if ((tmo + tmp + 1) < tmp)
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/* reset "advancing" timestamp to 0, set lastinc value */
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reset_timer_masked();
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else
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tmo += tmp; /* else, set advancing stamp wake up time */
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while (get_timer_masked() < tmo) /* loop till event */
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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, capture current incrementer value time */
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lastinc = readl(&timer_base->tcrr);
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timestamp = 0; /* start "advancing" time stamp from 0 */
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}
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ulong get_timer_masked(void)
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{
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ulong now = readl(&timer_base->tcrr); /* current tick value */
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if (now >= lastinc) /* normal mode (non roll) */
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/* move stamp fordward with absoulte diff ticks */
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timestamp += (now - lastinc);
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else /* we have rollover of incrementer */
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timestamp += (0xFFFFFFFF - lastinc) + now;
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lastinc = now;
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return timestamp;
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}
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/* waits specified delay value and resets timestamp */
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void udelay_masked(unsigned long usec)
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{
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ulong tmo;
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ulong endtime;
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signed long diff;
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/* if "big" number, spread normalization to seconds */
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if (usec >= 1000) {
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/* start to normalize for usec to ticks per sec */
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tmo = usec / 1000;
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/* find number of "ticks" to wait to achieve target */
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tmo *= CONFIG_SYS_HZ;
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tmo /= 1000; /* finish normalize. */
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} else { /* else small number, */
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/* don't kill it prior to HZ multiply */
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tmo = usec * CONFIG_SYS_HZ;
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tmo /= (1000 * 1000);
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}
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endtime = get_timer_masked() + tmo;
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do {
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ulong now = get_timer_masked();
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diff = endtime - now;
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} while (diff >= 0);
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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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tbclk = CONFIG_SYS_HZ;
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return tbclk;
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}
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