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author | Albert ARIBAUD <albert.u.boot@aribaud.net> | 2013-05-30 14:45:06 +0200 |
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committer | Albert ARIBAUD <albert.u.boot@aribaud.net> | 2013-05-30 14:45:06 +0200 |
commit | a19b0dd62d7b8efc658fa1aa685ff5665878f3ee (patch) | |
tree | 1fadf0fb3da83203ba28f209ec99e1b33e03f4d5 /arch/x86/lib/tsc_timer.c | |
parent | 60985bba58e7695dac1fddae8cdbb62d8cfd1254 (diff) | |
parent | a71d45d706a5b51c348160163b6c159632273fed (diff) | |
download | u-boot-imx-a19b0dd62d7b8efc658fa1aa685ff5665878f3ee.zip u-boot-imx-a19b0dd62d7b8efc658fa1aa685ff5665878f3ee.tar.gz u-boot-imx-a19b0dd62d7b8efc658fa1aa685ff5665878f3ee.tar.bz2 |
Merge branch 'u-boot/master' into 'u-boot-arm/master'
Conflicts:
common/cmd_fpga.c
drivers/usb/host/ohci-at91.c
Diffstat (limited to 'arch/x86/lib/tsc_timer.c')
-rw-r--r-- | arch/x86/lib/tsc_timer.c | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/arch/x86/lib/tsc_timer.c b/arch/x86/lib/tsc_timer.c new file mode 100644 index 0000000..c509801 --- /dev/null +++ b/arch/x86/lib/tsc_timer.c @@ -0,0 +1,107 @@ +/* + * Copyright (c) 2012 The Chromium OS Authors. + * + * 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 <malloc.h> +#include <asm/io.h> +#include <asm/i8254.h> +#include <asm/ibmpc.h> +#include <asm/msr.h> +#include <asm/u-boot-x86.h> + +DECLARE_GLOBAL_DATA_PTR; + +void timer_set_base(u64 base) +{ + gd->arch.tsc_base = base; +} + +/* + * Get the number of CPU time counter ticks since it was read first time after + * restart. This yields a free running counter guaranteed to take almost 6 + * years to wrap around even at 100GHz clock rate. + */ +u64 get_ticks(void) +{ + u64 now_tick = rdtsc(); + + /* We assume that 0 means the base hasn't been set yet */ + if (!gd->arch.tsc_base) + panic("No tick base available"); + return now_tick - gd->arch.tsc_base; +} + +#define PLATFORM_INFO_MSR 0xce + +/* Get the speed of the TSC timer in MHz */ +unsigned long get_tbclk_mhz(void) +{ + u32 ratio; + u64 platform_info = native_read_msr(PLATFORM_INFO_MSR); + + /* 100MHz times Max Non Turbo ratio */ + ratio = (platform_info >> 8) & 0xff; + return 100 * ratio; +} + +unsigned long get_tbclk(void) +{ + return get_tbclk_mhz() * 1000 * 1000; +} + +static ulong get_ms_timer(void) +{ + return (get_ticks() * 1000) / get_tbclk(); +} + +ulong get_timer(ulong base) +{ + return get_ms_timer() - base; +} + +ulong timer_get_us(void) +{ + return get_ticks() / get_tbclk_mhz(); +} + +ulong timer_get_boot_us(void) +{ + return timer_get_us(); +} + +void __udelay(unsigned long usec) +{ + u64 now = get_ticks(); + u64 stop; + + stop = now + usec * get_tbclk_mhz(); + + while ((int64_t)(stop - get_ticks()) > 0) + ; +} + +int timer_init(void) +{ +#ifdef CONFIG_SYS_PCAT_TIMER + /* Set up the PCAT timer if required */ + pcat_timer_init(); +#endif + + return 0; +} |