diff options
Diffstat (limited to 'src/lib')
| -rw-r--r-- | src/lib/Makefile.inc | 5 | ||||
| -rw-r--r-- | src/lib/timer.c | 42 |
2 files changed, 47 insertions, 0 deletions
diff --git a/src/lib/Makefile.inc b/src/lib/Makefile.inc index e01d3473f6..079c855f68 100644 --- a/src/lib/Makefile.inc +++ b/src/lib/Makefile.inc @@ -22,6 +22,8 @@ bootblock-y += prog_ops.c bootblock-y += cbfs.c cbfs_core.c bootblock-$(CONFIG_COMMON_CBFS_SPI_WRAPPER) += cbfs_spi.c +bootblock-$(CONFIG_GENERIC_UDELAY) += timer.c + bootblock-$(CONFIG_CONSOLE_CBMEM) += cbmem_console.c bootblock-y += memchr.c bootblock-y += memcmp.c @@ -61,6 +63,8 @@ romstage-$(CONFIG_ARCH_ROMSTAGE_X86_32) += gcc.c ramstage-$(CONFIG_ARCH_RAMSTAGE_X86_32) += gcc.c endif +romstage-$(CONFIG_GENERIC_UDELAY) += timer.c + ramstage-y += prog_ops.c ramstage-y += hardwaremain.c ramstage-y += selfboot.c @@ -89,6 +93,7 @@ ramstage-y += memrange.c ramstage-$(CONFIG_COOP_MULTITASKING) += thread.c ramstage-$(CONFIG_TIMER_QUEUE) += timer_queue.c ramstage-$(CONFIG_TERTIARY_BOARD_ID) += tristate_gpios.c +ramstage-$(CONFIG_GENERIC_UDELAY) += timer.c romstage-y += cbmem_common.c dynamic_cbmem.c ramstage-y += cbmem_common.c dynamic_cbmem.c diff --git a/src/lib/timer.c b/src/lib/timer.c new file mode 100644 index 0000000000..a2edc5c96d --- /dev/null +++ b/src/lib/timer.c @@ -0,0 +1,42 @@ +/* + * This file is part of the coreboot project. + * + * Copyright 2014 Google Inc. + * + * 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; version 2 of the License. + * + * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <console/console.h> +#include <timer.h> +#include <delay.h> +#include <thread.h> + +void udelay(unsigned usec) +{ + struct stopwatch sw; + + /* + * As the timer granularity is in microseconds pad the + * requested delay by one to get at least >= requested usec delay. + */ + usec += 1; + + if (!thread_yield_microseconds(usec)) + return; + + stopwatch_init_usecs_expire(&sw, usec); + + while (!stopwatch_expired(&sw)) + ; +} |