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EFM32: Implement HFPERCLK logic

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This commit is contained in:
Gregory Nutt 2014-10-28 19:46:45 -06:00
parent ecd641087c
commit ada012f325
1 changed files with 18 additions and 2 deletions
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20
arch/arm/src/efm32/efm32_clockconfig.c
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@ -550,8 +550,24 @@ static inline uint32_t efm32_hfcoreclk_config(uint32_t hfcoreclkdiv,
static inline uint32_t efm32_hfperclk_config(uint32_t hfperclkdiv, static inline uint32_t efm32_hfperclk_config(uint32_t hfperclkdiv,
uint32_t hfclk) uint32_t hfclk)
{ {
/* REVISIT: Divider not currently used */ uint32_t regval;
return hfclk; uint32_t hfperclk;
unsigned int divider;
DEBUGASSERT(hfperclkdiv <= _CMU_HFPERCLKDIV_HFPERCLKDIV_HFCLK512);
/* Set the divider and enable the HFPERCLK */
regval = (hfperclkdiv << _CMU_HFPERCLKDIV_HFPERCLKDIV_SHIFT) |
CMU_HFPERCLKDIV_HFPERCLKEN;
putreg32(regval, EFM32_CMU_HFPERCLKDIV);
/* The value of hfperclkdiv is log2 of the arithmetic divisor:
* 0->1, 1->2, 2->4, 3->8, ... 9->512.
*/
divider = 1 << hfperclkdiv;
return hfclk / divider;
} }
/**************************************************************************** /****************************************************************************