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rk30: sram: add sram_32k_udelay support deep slow mode delay

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黄涛
2012-05-15 14:52:03 +08:00
parent 90718b88e9
commit bed915e3c8
1 changed files with 3 additions and 1 deletions
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4
arch/arm/mach-rk30/include/mach/sram.h
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@@ -4,8 +4,10 @@
#include <plat/sram.h>
#define SRAM_LOOPS_PER_USEC 24
#define SRAM_LOOP(loops) do { unsigned int i = loops; barrier(); while (--i) barrier(); } while (0)
#define SRAM_LOOP(loops) do { unsigned int i = (loops); if (i < 7) i = 7; barrier(); while (--i) barrier(); } while (0)
/* delay on slow mode */
#define sram_udelay(usecs) SRAM_LOOP((usecs)*SRAM_LOOPS_PER_USEC)
/* delay on deep slow mode */
#define sram_32k_udelay(usecs) SRAM_LOOP(((usecs)*SRAM_LOOPS_PER_USEC)/(24000000/32768))
#endif