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aw_ccung: Support clock factors where factor=0, factor is effectively 1

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This happens in two cases for a20 clocks:

pll_core for 'n' factor:
factor=0, val=1
factor=n, val=n

ahb divisor:
factor=0,val=/2
factor=n,val=/2^n

Reviewed by:	manu
Differential Revision:	https://reviews.freebsd.org/D15806
This commit is contained in:
Kyle Evans 2018-06-14 17:36:02 +00:00
parent aab8510031
commit 85f58288a7
1 changed files with 3 additions and 0 deletions
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3
sys/arm/allwinner/clkng/aw_clk.h
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@ -72,6 +72,7 @@ struct aw_clk_init {
#define AW_CLK_FACTOR_ZERO_BASED 0x0002
#define AW_CLK_FACTOR_HAS_COND 0x0004
#define AW_CLK_FACTOR_FIXED 0x0008
#define AW_CLK_FACTOR_ZERO_IS_ONE 0x0010
struct aw_clk_factor {
uint32_t shift; /* Shift bits for the factor */
@ -110,6 +111,8 @@ aw_clk_get_factor(uint32_t val, struct aw_clk_factor *factor)
return (factor->value);
factor_val = (val & factor->mask) >> factor->shift;
if (factor_val == 0 && (factor->flags & AW_CLK_FACTOR_ZERO_IS_ONE))
factor_val = 1;
if (factor->flags & AW_CLK_FACTOR_POWER_OF_TWO)
factor_val = 1 << factor_val;