diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/cpu/arm926ejs/mx25/generic.c | 19 | ||||
| -rw-r--r-- | arch/arm/include/asm/arch-mx25/clock.h | 1 |
2 files changed, 20 insertions, 0 deletions
diff --git a/arch/arm/cpu/arm926ejs/mx25/generic.c b/arch/arm/cpu/arm926ejs/mx25/generic.c index f02cffb..5d9bc6c 100644 --- a/arch/arm/cpu/arm926ejs/mx25/generic.c +++ b/arch/arm/cpu/arm926ejs/mx25/generic.c @@ -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) diff --git a/arch/arm/include/asm/arch-mx25/clock.h b/arch/arm/include/asm/arch-mx25/clock.h index 9fdaa9d..7753caf 100644 --- a/arch/arm/include/asm/arch-mx25/clock.h +++ b/arch/arm/include/asm/arch-mx25/clock.h @@ -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) |