From df8a95f46f8e43a24003abe2efaca8c63c895b54 Mon Sep 17 00:00:00 2001 From: Wolfgang Grandegger Date: Wed, 11 Mar 2009 09:36:26 -0600 Subject: powerpc/5200: add function to return external clock frequency This patch adds the utility function mpc52xx_get_xtal_freq() to get the frequency of the external oscillator clock connected to the pin SYS_XTAL_IN. The MSCAN may us it as clock source. Unfortunately, this value is not available from the FDT blob, but it can be determined from the IPB frequency. Signed-off-by: Wolfgang Grandegger Signed-off-by: Grant Likely --- arch/powerpc/platforms/52xx/mpc52xx_common.c | 37 ++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) (limited to 'arch/powerpc/platforms/52xx/mpc52xx_common.c') diff --git a/arch/powerpc/platforms/52xx/mpc52xx_common.c b/arch/powerpc/platforms/52xx/mpc52xx_common.c index e9d2cf632ee..8e3dd5a0f22 100644 --- a/arch/powerpc/platforms/52xx/mpc52xx_common.c +++ b/arch/powerpc/platforms/52xx/mpc52xx_common.c @@ -205,6 +205,43 @@ int mpc52xx_set_psc_clkdiv(int psc_id, int clkdiv) } EXPORT_SYMBOL(mpc52xx_set_psc_clkdiv); +/** + * mpc52xx_get_xtal_freq - Get SYS_XTAL_IN frequency for a device + * + * @node: device node + * + * Returns the frequency of the external oscillator clock connected + * to the SYS_XTAL_IN pin, or 0 if it cannot be determined. + */ +unsigned int mpc52xx_get_xtal_freq(struct device_node *node) +{ + u32 val; + unsigned int freq; + + if (!mpc52xx_cdm) + return 0; + + freq = mpc52xx_find_ipb_freq(node); + if (!freq) + return 0; + + if (in_8(&mpc52xx_cdm->ipb_clk_sel) & 0x1) + freq *= 2; + + val = in_be32(&mpc52xx_cdm->rstcfg); + if (val & (1 << 5)) + freq *= 8; + else + freq *= 4; + if (val & (1 << 6)) + freq /= 12; + else + freq /= 16; + + return freq; +} +EXPORT_SYMBOL(mpc52xx_get_xtal_freq); + /** * mpc52xx_restart: ppc_md->restart hook for mpc5200 using the watchdog timer */ -- cgit v1.2.3