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

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>

diff --git a/arch/mips/include/asm/global_data.h b/arch/mips/include/asm/global_data.h
index 7b4ad083ba0fae843404777b581d517af87916d0..4c30fab8717be76e9018ac29d66668baab17099e 100644 (file)
--- a/arch/mips/include/asm/global_data.h
+++ b/arch/mips/include/asm/global_data.h
@@ -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>