diff options
author | Patrick Georgi <patrick.georgi@secunet.com> | 2012-11-20 11:53:47 +0100 |
---|---|---|
committer | Stefan Reinauer <stefan.reinauer@coreboot.org> | 2012-11-27 23:51:52 +0100 |
commit | e135ac5a7ea69b6edcb89345019212f5de412b1e (patch) | |
tree | 408611a9f2846867f9731af53b1f08dd32eb6851 /src/cpu/amd/model_10xxx/apic_timer.c | |
parent | bdc1816b2379bdf569ac6746172bba41e1307917 (diff) |
Remove AMD special case for LAPIC based udelay()
- Optionally override FSB clock detection in generic
LAPIC code with constant value.
- Override on AMD Model fxx, 10xxx, agesa CPUs with 200MHz
- compile LAPIC code for romstage, too
- Remove #include ".../apic_timer.c" in AMD based mainboards
- Remove custom udelay implementation from intel northbridges' romstages
Future work:
- remove the compile time special case
(requires some cpuid based switching)
- drop northbridge udelay implementations (i945, i5000) if
not required anymore (eg. can SMM use the LAPIC timer?)
Change-Id: I25bacaa2163f5e96ab7f3eaf1994ab6899eff054
Signed-off-by: Patrick Georgi <patrick.georgi@secunet.com>
Reviewed-on: http://review.coreboot.org/1618
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Tested-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Diffstat (limited to 'src/cpu/amd/model_10xxx/apic_timer.c')
-rw-r--r-- | src/cpu/amd/model_10xxx/apic_timer.c | 55 |
1 files changed, 0 insertions, 55 deletions
diff --git a/src/cpu/amd/model_10xxx/apic_timer.c b/src/cpu/amd/model_10xxx/apic_timer.c deleted file mode 100644 index d961da795b..0000000000 --- a/src/cpu/amd/model_10xxx/apic_timer.c +++ /dev/null @@ -1,55 +0,0 @@ -/* - * This file is part of the coreboot project. - * - * Copyright (C) 2007 Advanced Micro Devices, 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 <stdint.h> -#include <delay.h> -#include <cpu/x86/msr.h> -#include <cpu/x86/lapic.h> - -/* NOTE: We use the APIC TIMER register is to hold flags for AP init during - * pre-memory init (__PRE_RAM__). Don't use init_timer() and udelay is - * redirected to udelay_tsc(). - */ - - -void init_timer(void) -{ - /* Set the apic timer to no interrupts and periodic mode */ - lapic_write(LAPIC_LVTT, (1 << 17)|(1<< 16)|(0 << 12)|(0 << 0)); - - /* Set the divider to 1, no divider */ - lapic_write(LAPIC_TDCR, LAPIC_TDR_DIV_1); - - /* Set the initial counter to 0xffffffff */ - lapic_write(LAPIC_TMICT, 0xffffffff); - -} - - -void udelay(u32 usecs) -{ - u32 start, value, ticks; - /* Calculate the number of ticks to run, our FSB runs a 200Mhz */ - ticks = usecs * 200; - start = lapic_read(LAPIC_TMCCT); - do { - value = lapic_read(LAPIC_TMCCT); - } while((start - value) < ticks); - -} |