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author | wdenk <wdenk> | 2003-12-06 19:49:23 +0000 |
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committer | wdenk <wdenk> | 2003-12-06 19:49:23 +0000 |
commit | a8c7c708a9e0051c6358718c53572a4681eaa22b (patch) | |
tree | b560561c91725eb2f86289da61ee676787419e37 /lib_ppc | |
parent | fa1399ed127c8be507bf182dc7d8d61a54938d79 (diff) | |
download | u-boot-a8c7c708a9e0051c6358718c53572a4681eaa22b.zip u-boot-a8c7c708a9e0051c6358718c53572a4681eaa22b.tar.gz u-boot-a8c7c708a9e0051c6358718c53572a4681eaa22b.tar.bz2 |
* Patch by Gleb Natapov, 19 Sep 2003:
Move most of the timer interrupt related PPC code to ppc_lib/interrupts.c
* Patch by Anders Larsen, 17 Sep 2003:
Bring ARM memory layout in sync with the documentation:
stack and malloc-heap are now located _below_ the U-Boot code
Diffstat (limited to 'lib_ppc')
-rw-r--r-- | lib_ppc/Makefile | 2 | ||||
-rw-r--r-- | lib_ppc/interrupts.c | 148 |
2 files changed, 149 insertions, 1 deletions
diff --git a/lib_ppc/Makefile b/lib_ppc/Makefile index 36ddf3c..652a419 100644 --- a/lib_ppc/Makefile +++ b/lib_ppc/Makefile @@ -28,7 +28,7 @@ LIB = lib$(ARCH).a AOBJS = ppcstring.o ticks.o COBJS = board.o \ - bat_rw.o cache.o extable.o kgdb.o time.o + bat_rw.o cache.o extable.o kgdb.o time.o interrupts.o OBJS = $(AOBJS) $(COBJS) diff --git a/lib_ppc/interrupts.c b/lib_ppc/interrupts.c new file mode 100644 index 0000000..1e540a5 --- /dev/null +++ b/lib_ppc/interrupts.c @@ -0,0 +1,148 @@ +/* + * (C) Copyright 2000-2002 + * Wolfgang Denk, DENX Software Engineering, wd@denx.de. + * + * (C) Copyright 2003 + * Gleb Natapov <gnatapov@mrv.com> + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include <common.h> +#include <asm/processor.h> +#include <watchdog.h> +#ifdef CONFIG_STATUS_LED +#include <status_led.h> +#endif + +#ifdef CONFIG_SHOW_ACTIVITY + extern void board_show_activity (ulong); +#endif /* CONFIG_SHOW_ACTIVITY */ + +#ifndef CFG_WATCHDOG_FREQ +#define CFG_WATCHDOG_FREQ (CFG_HZ / 2) +#endif + +extern int interrupt_init_cpu (unsigned *); +extern void timer_interrupt_cpu (struct pt_regs *); + +static unsigned decrementer_count; /* count value for 1e6/HZ microseconds */ + +static __inline__ unsigned long get_msr (void) +{ + unsigned long msr; + + asm volatile ("mfmsr %0":"=r" (msr):); + + return msr; +} + +static __inline__ void set_msr (unsigned long msr) +{ + asm volatile ("mtmsr %0"::"r" (msr)); +} + +static __inline__ unsigned long get_dec (void) +{ + unsigned long val; + + asm volatile ("mfdec %0":"=r" (val):); + + return val; +} + + +static __inline__ void set_dec (unsigned long val) +{ + if (val) + asm volatile ("mtdec %0"::"r" (val)); +} + + +void enable_interrupts (void) +{ + set_msr (get_msr () | MSR_EE); +} + +/* returns flag if MSR_EE was set before */ +int disable_interrupts (void) +{ + ulong msr = get_msr (); + + set_msr (msr & ~MSR_EE); + return ((msr & MSR_EE) != 0); +} + +int interrupt_init (void) +{ + int ret; + + /* call cpu specific function from $(CPU)/interrupts.c */ + ret = interrupt_init_cpu (&decrementer_count); + + if (ret) + return ret; + + set_dec (decrementer_count); + + set_msr (get_msr () | MSR_EE); + + return (0); +} + +static volatile ulong timestamp = 0; + +void timer_interrupt (struct pt_regs *regs) +{ + /* call cpu specific function from $(CPU)/interrupts.c */ + timer_interrupt_cpu (regs); + + /* Restore Decrementer Count */ + set_dec (decrementer_count); + + timestamp++; + +#if defined(CONFIG_WATCHDOG) || defined (CONFIG_HW_WATCHDOG) + if ((timestamp % (CFG_WATCHDOG_FREQ)) == 0) + WATCHDOG_RESET (); +#endif /* CONFIG_WATCHDOG || CONFIG_HW_WATCHDOG */ + +#ifdef CONFIG_STATUS_LED + status_led_tick (timestamp); +#endif /* CONFIG_STATUS_LED */ + +#ifdef CONFIG_SHOW_ACTIVITY + board_show_activity (timestamp); +#endif /* CONFIG_SHOW_ACTIVITY */ +} + +void reset_timer (void) +{ + timestamp = 0; +} + +ulong get_timer (ulong base) +{ + return (timestamp - base); +} + +void set_timer (ulong t) +{ + timestamp = t; +} |