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MX5: Add AHB clock reporting and fix IPG clock reporting

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Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Jason Liu <jason.hui@linaro.org>
Acked-by: Jason Liu <jason.hui@linaro.org>
This commit is contained in:
Marek Vasut 2011-09-22 09:20:37 +00:00 committed by Albert ARIBAUD
parent bf2eaf5112
commit 95c0eb198d
1 changed files with 26 additions and 8 deletions
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34
arch/arm/cpu/armv7/mx5/clock.c
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@ -140,19 +140,36 @@ static u32 get_periph_clk(void)
/* NOTREACHED */
}
/*
* Get the rate of ahb clock.
*/
static u32 get_ahb_clk(void)
{
uint32_t freq, div, reg;
freq = get_periph_clk();
reg = __raw_readl(&mxc_ccm->cbcdr);
div = ((reg & MXC_CCM_CBCDR_AHB_PODF_MASK) >>
MXC_CCM_CBCDR_AHB_PODF_OFFSET) + 1;
return freq / div;
}
/*
* Get the rate of ipg clock.
*/
static u32 get_ipg_clk(void)
{
u32 ahb_podf, ipg_podf;
uint32_t freq, reg, div;
ahb_podf = __raw_readl(&mxc_ccm->cbcdr);
ipg_podf = (ahb_podf & MXC_CCM_CBCDR_IPG_PODF_MASK) >>
MXC_CCM_CBCDR_IPG_PODF_OFFSET;
ahb_podf = (ahb_podf & MXC_CCM_CBCDR_AHB_PODF_MASK) >>
MXC_CCM_CBCDR_AHB_PODF_OFFSET;
return get_periph_clk() / ((ahb_podf + 1) * (ipg_podf + 1));
freq = get_ahb_clk();
reg = __raw_readl(&mxc_ccm->cbcdr);
div = ((reg & MXC_CCM_CBCDR_IPG_PODF_MASK) >>
MXC_CCM_CBCDR_IPG_PODF_OFFSET) + 1;
return freq / div;
}
/*
@ -279,7 +296,7 @@ unsigned int mxc_get_clock(enum mxc_clock clk)
case MXC_ARM_CLK:
return get_mcu_main_clk();
case MXC_AHB_CLK:
break;
return get_ahb_clk();
case MXC_IPG_CLK:
return get_ipg_clk();
case MXC_IPG_PERCLK:
@ -325,6 +342,7 @@ int do_mx5_showclocks(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
freq = decode_pll(mxc_plls[PLL4_CLOCK], CONFIG_SYS_MX5_HCLK);
printf("pll4: %dMHz\n", freq / 1000000);
#endif
printf("ahb clock : %dHz\n", mxc_get_clock(MXC_AHB_CLK));
printf("ipg clock : %dHz\n", mxc_get_clock(MXC_IPG_CLK));
printf("ipg per clock : %dHz\n", mxc_get_clock(MXC_IPG_PERCLK));