Re: [U-Boot] [PATCH 10/19] x86: Re-enable PCAT timer 2 for beeping

Hi Simon,

On Thu, Apr 18, 2013 at 12:13 PM, Simon Glass sjg@chromium.org wrote:

While we don't want PCAT timers for timing, we want timer 2 so that we can still make a beep. Re-purpose the PCAT driver for this, and enable it in coreboot.

Signed-off-by: Simon Glass sjg@chromium.org

arch/x86/include/asm/u-boot-x86.h | 1 + arch/x86/lib/Makefile | 2 +- arch/x86/lib/pcat_timer.c | 69

++-------------------------------------

arch/x86/lib/tsc_timer.c | 6 +++- include/configs/coreboot.h | 1 + 5 files changed, 11 insertions(+), 68 deletions(-)

[snip]

-/* this is not very exact */ -void __udelay(unsigned long usec) -{

•   int counter;
  

•   int wraps;
  

•   if (timer_init_done) {
  

•           counter = read_pit();
  

•           wraps = usec / 1000;
  

•           usec = usec % 1000;
  

•           usec *= 1194;
  

•           usec /= 1000;
  

•           usec += counter;
  

•           while (usec > 1194) {
  

•                   usec -= 1194;
  

•                   wraps++;
  

•           }
  

•           while (1) {
  

•                   int new_count = read_pit();
  

•                   if (((new_count < usec) && !wraps) || wraps < 0)
  

•                           break;
  

•                   if (new_count > counter)
  

•                           wraps--;
  

•                   counter = new_count;
  

•           }
  

•   }
  

-}

This does not seem related...

Regards,

Graeme