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ddr: altera: Clean up of delay_for_n_mem_clocks() part 1

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Fix data types, clean up comments a bit and fix coding style a bit.
No functional change.

Signed-off-by: Marek Vasut <marex@denx.de>
This commit is contained in:
Marek Vasut 2015-07-26 11:11:28 +02:00
parent f1f22f7204
commit 90a584b763
1 changed files with 13 additions and 14 deletions
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27
drivers/ddr/altera/sequencer.c
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@ -758,40 +758,39 @@ static void set_jump_as_return(void)
* should always use constants as argument to ensure all computations are * should always use constants as argument to ensure all computations are
* performed at compile time * performed at compile time
*/ */
static void delay_for_n_mem_clocks(const uint32_t clocks) static void delay_for_n_mem_clocks(const u32 clocks)
{ {
uint32_t afi_clocks; u32 afi_clocks;
uint8_t inner = 0; u16 c_loop = 0;
uint8_t outer = 0; u8 inner = 0;
uint16_t c_loop = 0; u8 outer = 0;
debug("%s:%d: clocks=%u ... start\n", __func__, __LINE__, clocks); debug("%s:%d: clocks=%u ... start\n", __func__, __LINE__, clocks);
afi_clocks = (clocks + AFI_RATE_RATIO-1) / AFI_RATE_RATIO;
/* scale (rounding up) to get afi clocks */ /* scale (rounding up) to get afi clocks */
afi_clocks = DIV_ROUND_UP(clocks, AFI_RATE_RATIO);
/* /*
* Note, we don't bother accounting for being off a little bit * Note, we don't bother accounting for being off a little
* because of a few extra instructions in outer loops * bit because of a few extra instructions in outer loops.
* Note, the loops have a test at the end, and do the test before * Note, the loops have a test at the end, and do the test
* the decrement, and so always perform the loop * before the decrement, and so always perform the loop
* 1 time more than the counter value * 1 time more than the counter value
*/ */
if (afi_clocks == 0) { if (afi_clocks == 0) {
; ;
} else if (afi_clocks <= 0x100) { } else if (afi_clocks <= 0x100) {
inner = afi_clocks-1; inner = afi_clocks - 1;
outer = 0; outer = 0;
c_loop = 0; c_loop = 0;
} else if (afi_clocks <= 0x10000) { } else if (afi_clocks <= 0x10000) {
inner = 0xff; inner = 0xff;
outer = (afi_clocks-1) >> 8; outer = (afi_clocks - 1) >> 8;
c_loop = 0; c_loop = 0;
} else { } else {
inner = 0xff; inner = 0xff;
outer = 0xff; outer = 0xff;
c_loop = (afi_clocks-1) >> 16; c_loop = (afi_clocks - 1) >> 16;
} }
/* /*