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#include <rtems.h>
#include <bsp.h>
#include <s3c2400.h>
/* ------------------------------------------------------------------------- */
/* NOTE: This describes the proper use of this file.
*
* BSP_OSC_FREQ should be defined as the input frequency of the PLL.
*
* get_FCLK(), get_HCLK(), get_PCLK() and get_UCLK() return the clock of
* the specified bus in HZ.
*/
/* ------------------------------------------------------------------------- */
/* return FCLK frequency */
uint32_t get_FCLK(void)
{
uint32_t r, m, p, s;
r = rMPLLCON;
m = ((r & 0xFF000) >> 12) + 8;
p = ((r & 0x003F0) >> 4) + 2;
s = r & 0x3;
return((BSP_OSC_FREQ * m) / (p << s));
}
/* return UCLK frequency */
uint32_t get_UCLK(void)
{
uint32_t r, m, p, s;
r = rUPLLCON;
m = ((r & 0xFF000) >> 12) + 8;
p = ((r & 0x003F0) >> 4) + 2;
s = r & 0x3;
return((BSP_OSC_FREQ * m) / (p << s));
}
/* return HCLK frequency */
uint32_t get_HCLK(void)
{
if (rCLKDIVN & 0x2)
return get_FCLK()/2;
else
return get_FCLK();
}
/* return PCLK frequency */
uint32_t get_PCLK(void)
{
if (rCLKDIVN & 0x1)
return get_HCLK()/2;
else
return get_HCLK();
}
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