Commit 060ef094 authored by York Sun's avatar York Sun
Browse files

armv8/fsl-lsch3: Implement workaround for erratum A008585



Generic Timer may contain an erroneous value. The workaround is to
read it twice until getting the same value.
Signed-off-by: default avatarYork Sun <yorksun@freescale.com>
parent 5abf13e4
......@@ -25,7 +25,18 @@ unsigned long get_tbclk(void)
unsigned long timer_read_counter(void)
{
unsigned long cntpct;
#ifdef CONFIG_SYS_FSL_ERRATUM_A008585
/* This erratum number needs to be confirmed to match ARM document */
unsigned long temp;
#endif
isb();
asm volatile("mrs %0, cntpct_el0" : "=r" (cntpct));
#ifdef CONFIG_SYS_FSL_ERRATUM_A008585
asm volatile("mrs %0, cntpct_el0" : "=r" (temp));
while (temp != cntpct) {
asm volatile("mrs %0, cntpct_el0" : "=r" (cntpct));
asm volatile("mrs %0, cntpct_el0" : "=r" (temp));
}
#endif
return cntpct;
}
......@@ -120,6 +120,7 @@
#ifdef CONFIG_LS2085A
#define CONFIG_SYS_FSL_ERRATUM_A008336
#define CONFIG_SYS_FSL_ERRATUM_A008514
#define CONFIG_SYS_FSL_ERRATUM_A008585
#endif
#endif /* _ASM_ARMV8_FSL_LSCH3_CONFIG_ */
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment