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author | Timothy Pearson <tpearson@raptorengineering.com> | 2017-08-23 15:54:21 -0500 |
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committer | Timothy Pearson <tpearson@raptorengineering.com> | 2017-08-23 15:54:21 -0500 |
commit | 0223e595f4033e91e93403a7317bcc9e47676b8f (patch) | |
tree | 2ccd7127bc343f82456b76eeb0da2d380f6eaf65 /arch/microblaze/cpu/timer.c | |
download | ast2050-uboot-0223e595f4033e91e93403a7317bcc9e47676b8f.zip ast2050-uboot-0223e595f4033e91e93403a7317bcc9e47676b8f.tar.gz |
Initial import of modified u-boot tree
Original upstream URL:
git://git.denx.de/u-boot.git
Original upstream GIT hash:
62c175fbb8a0f9a926c88294ea9f7e88eb898f6c
Diffstat (limited to 'arch/microblaze/cpu/timer.c')
-rw-r--r-- | arch/microblaze/cpu/timer.c | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/arch/microblaze/cpu/timer.c b/arch/microblaze/cpu/timer.c new file mode 100644 index 0000000..1330401 --- /dev/null +++ b/arch/microblaze/cpu/timer.c @@ -0,0 +1,102 @@ +/* + * (C) Copyright 2007 Michal Simek + * + * Michal SIMEK <monstr@monstr.eu> + * + * 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/microblaze_timer.h> +#include <asm/microblaze_intc.h> + +volatile int timestamp = 0; +microblaze_timer_t *tmr; + +ulong get_timer (ulong base) +{ + if (tmr) + return timestamp - base; + return timestamp++ - base; +} + +void __udelay(unsigned long usec) +{ + u32 i; + + if (tmr) { + i = get_timer(0); + while ((get_timer(0) - i) < (usec / 1000)) + ; + } else { + for (i = 0; i < (usec * XILINX_CLOCK_FREQ / 10000000); i++) + ; + } +} + +static void timer_isr(void *arg) +{ + timestamp++; + tmr->control = tmr->control | TIMER_INTERRUPT; +} + +int timer_init (void) +{ + int irq = -1; + u32 preload = 0; + u32 ret = 0; + +#if defined(CONFIG_SYS_TIMER_0_ADDR) && defined(CONFIG_SYS_INTC_0_NUM) + preload = XILINX_CLOCK_FREQ / CONFIG_SYS_HZ; + irq = CONFIG_SYS_TIMER_0_IRQ; + tmr = (microblaze_timer_t *) (CONFIG_SYS_TIMER_0_ADDR); +#endif + + if (tmr && preload && irq >= 0) { + tmr->loadreg = preload; + tmr->control = TIMER_INTERRUPT | TIMER_RESET; + tmr->control = TIMER_ENABLE | TIMER_ENABLE_INTR |\ + TIMER_RELOAD | TIMER_DOWN_COUNT; + timestamp = 0; + ret = install_interrupt_handler (irq, timer_isr, (void *)tmr); + if (ret) + tmr = NULL; + } + + /* No problem if timer is not found/initialized */ + return 0; +} + +/* + * This function is derived from PowerPC code (read timebase as long long). + * On Microblaze it just returns the timer value. + */ +unsigned long long get_ticks(void) +{ + return get_timer(0); +} + +/* + * This function is derived from PowerPC code (timebase clock frequency). + * On Microblaze it returns the number of timer ticks per second. + */ +ulong get_tbclk(void) +{ + return CONFIG_SYS_HZ; +} |