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https://github.com/AsahiLinux/u-boot
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91558c8153
solve issue when bootstage is used with armV7 generic timer
first call of timer_get_boot_us() use the function get_timer()
before timer initialization (arch.timer_rate_hz = 0)
=> div by 0
Commit-notes
When I activate bootstage on ARMV7 architecture with platform
using the generic armv7 timer defined in file
./arch/arm/cpu/armv7m/timer.c
I have a issue because gd->arch.timer_rate_hz = 0
For me the get_timer() function should not used before timer_init
(which initialize gd->arch.timer_rate_hz) at least for the ARMV7
timer.
But in the init sequence, the first bootstage fucntion is called
before timer_init and this function use the timer function.
For me it is a error in the generic init sequence :
mark_bootstage is called before timer_init.
static init_fnc_t init_sequence_f[] = {
....
arch_cpu_init_dm,
mark_bootstage, /* need timer, go after init dm */
...
#if defined(CONFIG_ARM) || defined(CONFIG_MIPS) || \
defined(CONFIG_BLACKFIN) || defined(CONFIG_NDS32) || \
defined(CONFIG_SPARC)
timer_init, /* initialize timer */
#endif
.......
To solve the issue for all the paltform, we can move timer_init()
call just before mark_bootstage() in this array...
It should be ok for ARMV7 but I don't sure for other platform
impacted
- the other ARM platform or ARMV7 wich don't use generic timer
- MIPS BLACKFIN NDS32 or SPARC
and I don't sure of impact for other function called
(board_early_init_f for example....)
=> This patch solve issue only in timer armv7
get_boot_us() can be called everytime without div by 0 issue
(gd->arch.timer_rate_hz is not used)
END
Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Signed-off-by: Patrick Delaunay <patrick.delaunay73@gmail.com>
63 lines
1.1 KiB
C
63 lines
1.1 KiB
C
/*
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* (C) Copyright 2012-2014
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* Texas Instruments Incorporated, <www.ti.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <div64.h>
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#include <bootstage.h>
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DECLARE_GLOBAL_DATA_PTR;
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int timer_init(void)
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{
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gd->arch.tbl = 0;
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gd->arch.tbu = 0;
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gd->arch.timer_rate_hz = CONFIG_SYS_HZ_CLOCK / CONFIG_SYS_HZ;
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return 0;
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}
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unsigned long long get_ticks(void)
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{
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ulong nowl, nowu;
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asm volatile("mrrc p15, 0, %0, %1, c14" : "=r" (nowl), "=r" (nowu));
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gd->arch.tbl = nowl;
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gd->arch.tbu = nowu;
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return (((unsigned long long)gd->arch.tbu) << 32) | gd->arch.tbl;
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}
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ulong get_timer(ulong base)
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{
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return lldiv(get_ticks(), gd->arch.timer_rate_hz) - base;
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}
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ulong timer_get_boot_us(void)
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{
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return lldiv(get_ticks(), CONFIG_SYS_HZ_CLOCK / (CONFIG_SYS_HZ * 1000));
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}
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void __udelay(unsigned long usec)
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{
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unsigned long long endtime;
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endtime = lldiv((unsigned long long)usec * gd->arch.timer_rate_hz,
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1000UL);
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endtime += get_ticks();
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while (get_ticks() < endtime)
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;
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}
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ulong get_tbclk(void)
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{
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return gd->arch.timer_rate_hz;
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}
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