mirror of https://gitee.com/openkylin/linux.git
26ccd2d376
Add a platform clocksource by adapting the existing arch_gettimeoffset implementation. Normally the MFP timer C interrupt flag would be used to check for timer counter wrap-around. Unfortunately, that flag gets cleared by the MFP itself (due to automatic End-of-Interrupt mode). This means that mfp_timer_c_handler() and atari_read_clk() must race when accounting for counter wrap-around. That problem is avoided by effectively stopping the clock when it might otherwise jump backwards (due to interrupt latency). Note that this may affect clock accuracy. After the timer interrupt is asserted, wait for the counter to be reloaded so that atari_read_clk() will not see the intermediate state as that would cause the clock to jump backwards. Signed-off-by: Finn Thain <fthain@telegraphics.com.au> Acked-by: Linus Walleij <linus.walleij@linaro.org> Tested-by: Michael Schmitz <schmitzmic@gmail.com> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> |
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| .. | ||
| Makefile | ||
| ataints.c | ||
| atakeyb.c | ||
| atasound.c | ||
| config.c | ||
| debug.c | ||
| nvram.c | ||
| stdma.c | ||
| stram.c | ||
| time.c | ||