5 * Richard Woodruff <r-woodruff2@ti.com>
6 * Syed Moahmmed Khasim <khasim@ti.com>
9 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
10 * Marius Groeger <mgroeger@sysgo.de>
11 * Alex Zuepke <azu@sysgo.de>
14 * Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
16 * See file CREDITS for list of people who contributed to this
19 * This program is free software; you can redistribute it and/or
20 * modify it under the terms of the GNU General Public License as
21 * published by the Free Software Foundation; either version 2 of
22 * the License, or (at your option) any later version.
24 * This program is distributed in the hope that it will be useful,
25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27 * GNU General Public License for more details.
29 * You should have received a copy of the GNU General Public License
30 * along with this program; if not, write to the Free Software
31 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
37 #include <asm/proc-armv/ptrace.h>
39 #define TIMER_LOAD_VAL 0
42 /* enable IRQ interrupts */
43 void enable_interrupts(void)
46 __asm__ __volatile__("mrs %0, cpsr\n"
47 "bic %0, %0, #0x80\n" "msr cpsr_c, %0":"=r"(temp)
52 * disable IRQ/FIQ interrupts
53 * returns true if interrupts had been enabled before we disabled them
55 int disable_interrupts(void)
57 unsigned long old, temp;
58 __asm__ __volatile__("mrs %0, cpsr\n"
60 "msr cpsr_c, %1":"=r"(old), "=r"(temp)
62 return (old & 0x80) == 0;
65 void enable_interrupts(void)
69 int disable_interrupts(void)
77 panic("Resetting CPU ...\n");
81 void show_regs(struct pt_regs *regs)
84 const char *processor_modes[] = {
85 "USER_26", "FIQ_26", "IRQ_26", "SVC_26",
86 "UK4_26", "UK5_26", "UK6_26", "UK7_26",
87 "UK8_26", "UK9_26", "UK10_26", "UK11_26",
88 "UK12_26", "UK13_26", "UK14_26", "UK15_26",
89 "USER_32", "FIQ_32", "IRQ_32", "SVC_32",
90 "UK4_32", "UK5_32", "UK6_32", "ABT_32",
91 "UK8_32", "UK9_32", "UK10_32", "UND_32",
92 "UK12_32", "UK13_32", "UK14_32", "SYS_32",
95 flags = condition_codes(regs);
97 printf("pc : [<%08lx>] lr : [<%08lx>]\n"
98 "sp : %08lx ip : %08lx fp : %08lx\n",
99 instruction_pointer(regs),
100 regs->ARM_lr, regs->ARM_sp, regs->ARM_ip, regs->ARM_fp);
101 printf("r10: %08lx r9 : %08lx r8 : %08lx\n",
102 regs->ARM_r10, regs->ARM_r9, regs->ARM_r8);
103 printf("r7 : %08lx r6 : %08lx r5 : %08lx r4 : %08lx\n",
104 regs->ARM_r7, regs->ARM_r6, regs->ARM_r5, regs->ARM_r4);
105 printf("r3 : %08lx r2 : %08lx r1 : %08lx r0 : %08lx\n",
106 regs->ARM_r3, regs->ARM_r2, regs->ARM_r1, regs->ARM_r0);
107 printf("Flags: %c%c%c%c",
108 flags & CC_N_BIT ? 'N' : 'n',
109 flags & CC_Z_BIT ? 'Z' : 'z',
110 flags & CC_C_BIT ? 'C' : 'c', flags & CC_V_BIT ? 'V' : 'v');
111 printf(" IRQs %s FIQs %s Mode %s%s\n",
112 interrupts_enabled(regs) ? "on" : "off",
113 fast_interrupts_enabled(regs) ? "on" : "off",
114 processor_modes[processor_mode(regs)],
115 thumb_mode(regs) ? " (T)" : "");
118 void do_undefined_instruction(struct pt_regs *pt_regs)
120 printf("undefined instruction\n");
125 void do_software_interrupt(struct pt_regs *pt_regs)
127 printf("software interrupt\n");
132 void do_prefetch_abort(struct pt_regs *pt_regs)
134 printf("prefetch abort\n");
139 void do_data_abort(struct pt_regs *pt_regs)
141 printf("data abort\n");
146 void do_not_used(struct pt_regs *pt_regs)
148 printf("not used\n");
153 void do_fiq(struct pt_regs *pt_regs)
155 printf("fast interrupt request\n");
160 void do_irq(struct pt_regs *pt_regs)
162 printf("interrupt request\n");
168 static ulong timestamp;
169 static ulong lastinc;
170 static gptimer_t *timer_base = (gptimer_t *)CONFIG_SYS_TIMERBASE;
172 /* nothing really to do with interrupts, just starts up a counter. */
173 int interrupt_init(void)
175 /* start the counter ticking up, reload value on overflow */
176 writel(TIMER_LOAD_VAL, &timer_base->tldr);
178 writel((CONFIG_SYS_PTV << 2) | TCLR_PRE | TCLR_AR | TCLR_ST,
181 reset_timer_masked(); /* init the timestamp and lastinc value */
187 * timer without interrupts
189 void reset_timer(void)
191 reset_timer_masked();
194 ulong get_timer(ulong base)
196 return get_timer_masked() - base;
199 void set_timer(ulong t)
204 /* delay x useconds AND perserve advance timstamp value */
205 void udelay(unsigned long usec)
209 /* if "big" number, spread normalization to seconds */
211 /* if "big" number, spread normalization to seconds */
213 /* find number of "ticks" to wait to achieve target */
214 tmo *= CONFIG_SYS_HZ;
215 tmo /= 1000; /* finish normalize. */
216 } else {/* else small number, don't kill it prior to HZ multiply */
217 tmo = usec * CONFIG_SYS_HZ;
218 tmo /= (1000 * 1000);
221 tmp = get_timer(0); /* get current timestamp */
222 /* if setting this forward will roll time stamp */
223 if ((tmo + tmp + 1) < tmp)
224 /* reset "advancing" timestamp to 0, set lastinc value */
225 reset_timer_masked();
227 tmo += tmp; /* else, set advancing stamp wake up time */
228 while (get_timer_masked() < tmo) /* loop till event */
232 void reset_timer_masked(void)
234 /* reset time, capture current incrementer value time */
235 lastinc = readl(&timer_base->tcrr);
236 timestamp = 0; /* start "advancing" time stamp from 0 */
239 ulong get_timer_masked(void)
241 ulong now = readl(&timer_base->tcrr); /* current tick value */
243 if (now >= lastinc) /* normal mode (non roll) */
244 /* move stamp fordward with absoulte diff ticks */
245 timestamp += (now - lastinc);
246 else /* we have rollover of incrementer */
247 timestamp += (0xFFFFFFFF - lastinc) + now;
252 /* waits specified delay value and resets timestamp */
253 void udelay_masked(unsigned long usec)
259 /* if "big" number, spread normalization to seconds */
261 /* start to normalize for usec to ticks per sec */
263 /* find number of "ticks" to wait to achieve target */
264 tmo *= CONFIG_SYS_HZ;
265 tmo /= 1000; /* finish normalize. */
266 } else { /* else small number, */
267 /* don't kill it prior to HZ multiply */
268 tmo = usec * CONFIG_SYS_HZ;
269 tmo /= (1000 * 1000);
271 endtime = get_timer_masked() + tmo;
274 ulong now = get_timer_masked();
275 diff = endtime - now;
280 * This function is derived from PowerPC code (read timebase as long long).
281 * On ARM it just returns the timer value.
283 unsigned long long get_ticks(void)
289 * This function is derived from PowerPC code (timebase clock frequency).
290 * On ARM it returns the number of timer ticks per second.
292 ulong get_tbclk(void)
295 tbclk = CONFIG_SYS_HZ;