diff options
Diffstat (limited to 'arch/arm/mach-mxs/speed-imx28.c')
| -rw-r--r-- | arch/arm/mach-mxs/speed-imx28.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/arm/mach-mxs/speed-imx28.c b/arch/arm/mach-mxs/speed-imx28.c index 4f4db1bbfb..2641fb6fb2 100644 --- a/arch/arm/mach-mxs/speed-imx28.c +++ b/arch/arm/mach-mxs/speed-imx28.c @@ -258,6 +258,27 @@ unsigned imx_get_hclk(void) return rate * 1000; } +unsigned imx_set_hclk(unsigned nc) +{ + unsigned root_rate = imx_get_armclk(); + unsigned reg, div; + + div = DIV_ROUND_UP(root_rate, nc); + if ((div == 0) || (div >= 32)) + return 0; + + if ((root_rate < nc) && (root_rate == 64000000)) + div = 3; + + reg = readl(IMX_CCM_BASE + HW_CLKCTRL_HBUS) & ~0x3f; + writel(reg | div, IMX_CCM_BASE + HW_CLKCTRL_HBUS); + + while (readl(IMX_CCM_BASE + HW_CLKCTRL_HBUS) & (1 << 31)) + ; + + return imx_get_hclk(); +} + /* * Source of UART, debug UART, audio, PWM, dri, timer, digctl */ |