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mx25: Add function to set PER clocks 

Introduce the imx_set_perclk() function to make it possible to set the
PER clocks.

Signed-off-by: Benoît Thébaudeau <benoit@wsystem.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
This commit is contained in:
Benoît Thébaudeau 2017-05-03 11:59:05 +02:00 committed by Stefano Babic
parent f7c13e6a79
commit 3e3aab3379
2 changed files with 20 additions and 0 deletions
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19
arch/arm/cpu/arm926ejs/mx25/generic.c
View File

@ -113,6 +113,25 @@ static ulong imx_get_perclk(int clk)
return fref / div;
}
int imx_set_perclk(enum mxc_clock clk, bool from_upll, unsigned int freq)
{
struct ccm_regs *ccm = (struct ccm_regs *)IMX_CCM_BASE;
ulong fref = from_upll ? imx_get_upllclk() : imx_get_ahbclk();
ulong div = (fref + freq - 1) / freq;
if (clk > MXC_UART_CLK || !div || --div > CCM_PERCLK_MASK)
return -EINVAL;
clrsetbits_le32(&ccm->pcdr[CCM_PERCLK_REG(clk)],
CCM_PERCLK_MASK << CCM_PERCLK_SHIFT(clk),
div << CCM_PERCLK_SHIFT(clk));
if (from_upll)
setbits_le32(&ccm->mcr, 1 << clk);
else
clrbits_le32(&ccm->mcr, 1 << clk);
return 0;
}
unsigned int mxc_get_clock(enum mxc_clock clk)
{
if (clk >= MXC_CLK_NUM)

1
arch/arm/include/asm/arch-mx25/clock.h
View File

@ -51,6 +51,7 @@ enum mxc_clock {
MXC_CLK_NUM
};
int imx_set_perclk(enum mxc_clock clk, bool from_upll, unsigned int freq);
unsigned int mxc_get_clock(enum mxc_clock clk);
#define imx_get_uartclk() mxc_get_clock(MXC_UART_CLK)