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mx5 clocks: Fix get_uart_clk()

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This function returned 66500000 instead of the correct lp_apm clock frequency if
the CCM.CSCMR1.uart_clk_sel mux is set to 3.

This patch fixes this issue by introducing the get_standard_pll_sel_clk()
function that will be used by future patches to handle identical muxes used by
many other clocks.

Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
Cc: Stefano Babic <sbabic@denx.de>
This commit is contained in:
Benoît Thébaudeau 2012-09-27 10:23:23 +00:00 committed by Tom Rini
parent f124e718f4
commit 08028b113e
1 changed files with 26 additions and 14 deletions
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40
arch/arm/cpu/armv7/mx5/clock.c
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@ -331,27 +331,39 @@ static u32 get_ipg_per_clk(void)
return freq / ((pred1 + 1) * (pred2 + 1) * (podf + 1));
}
/* Get the output clock rate of a standard PLL MUX for peripherals. */
static u32 get_standard_pll_sel_clk(u32 clk_sel)
{
u32 freq;
switch (clk_sel & 0x3) {
case 0:
freq = decode_pll(mxc_plls[PLL1_CLOCK], MXC_HCLK);
break;
case 1:
freq = decode_pll(mxc_plls[PLL2_CLOCK], MXC_HCLK);
break;
case 2:
freq = decode_pll(mxc_plls[PLL3_CLOCK], MXC_HCLK);
break;
case 3:
freq = get_lp_apm();
break;
}
return freq;
}
/*
* Get the rate of uart clk.
*/
static u32 get_uart_clk(void)
{
unsigned int freq, reg, pred, podf;
unsigned int clk_sel, freq, reg, pred, podf;
reg = readl(&mxc_ccm->cscmr1);
switch (MXC_CCM_CSCMR1_UART_CLK_SEL_RD(reg)) {
case 0x0:
freq = decode_pll(mxc_plls[PLL1_CLOCK], MXC_HCLK);
break;
case 0x1:
freq = decode_pll(mxc_plls[PLL2_CLOCK], MXC_HCLK);
break;
case 0x2:
freq = decode_pll(mxc_plls[PLL3_CLOCK], MXC_HCLK);
break;
default:
return 66500000;
}
clk_sel = MXC_CCM_CSCMR1_UART_CLK_SEL_RD(reg);
freq = get_standard_pll_sel_clk(clk_sel);
reg = readl(&mxc_ccm->cscdr1);
pred = MXC_CCM_CSCDR1_UART_CLK_PRED_RD(reg);