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mips: add a mtmips-specific field to architecture-specific global data

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SoCs of mtmips can use different CPU frequencies depending on the HW/SW
configurations. For example mt7628 uses 580MHz clock if the input xtal
frequency is 40MHz, and 575MHz clock if the xtal is 25MHz. Upon cold boot
the CPU uses the xtal frequency directly.

So hardcoding the timer frequency (half of the CPU frequency) in
CONFIG_SYS_MIPS_TIMER_FREQ is not a good idea for this case.

This patch adds a mtmips-specific field timer_freq to arch_global_data.
This field will be used later in mtmips-specific get_tbclk() to provide
accurate timer frequency in different boot stage.

Reviewed-by: Stefan Roese <sr@denx.de>
Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
This commit is contained in:
Weijie Gao 2020-04-21 09:28:32 +02:00 committed by Daniel Schwierzeck
parent c366a45649
commit a60c1e6d6b
1 changed files with 3 additions and 0 deletions
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3
arch/mips/include/asm/global_data.h
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@ -27,6 +27,9 @@ struct arch_global_data {
#ifdef CONFIG_MIPS_L2_CACHE
unsigned short l2_line_size;
#endif
#ifdef CONFIG_ARCH_MTMIPS
unsigned long timer_freq;
#endif
};
#include <asm-generic/global_data.h>