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mmc: sh_mmcif: Use DIV_ROUND_UP and fls instead of calculation loop

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Use DIV_ROUND_UP and fls to simplify the code.

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
This commit is contained in:
Nobuhiro Iwamatsu 2014-12-03 17:57:00 +09:00 committed by Nobuhiro Iwamatsu
parent 97cdf64026
commit 21ea350385
1 changed files with 6 additions and 8 deletions
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14
drivers/mmc/sh_mmcif.c
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@ -103,20 +103,18 @@ static int mmcif_wait_interrupt_flag(struct sh_mmcif_host *host)
static void sh_mmcif_clock_control(struct sh_mmcif_host *host, unsigned int clk)
{
int i;
sh_mmcif_bitclr(CLK_ENABLE, &host->regs->ce_clk_ctrl);
sh_mmcif_bitclr(CLK_CLEAR, &host->regs->ce_clk_ctrl);
if (!clk)
return;
if (clk == CLKDEV_EMMC_DATA) {
if (clk == CLKDEV_EMMC_DATA)
sh_mmcif_bitset(CLK_PCLK, &host->regs->ce_clk_ctrl);
} else {
for (i = 1; (unsigned int)host->clk / (1 << i) >= clk; i++)
;
sh_mmcif_bitset((i - 1) << 16, &host->regs->ce_clk_ctrl);
}
else
sh_mmcif_bitset((fls(DIV_ROUND_UP(host->clk,
clk) - 1) - 1) << 16,
&host->regs->ce_clk_ctrl);
sh_mmcif_bitset(CLK_ENABLE, &host->regs->ce_clk_ctrl);
}