Date: Wed, 13 Jun 2007 10:10:24 +0200 (CEST) From: =?iso-8859-1?Q?Bj=F6rn_K=F6nig?= <bkoenig@alpha-tierchen.de> To: "M. Warner Losh" <imp@bsdimp.com> Cc: arm@freebsd.org Subject: Re: main clock frequency Message-ID: <57472.2001:6f8:101e:0:20e:cff:fe6d:6adb.1181722224.squirrel@webmail.alpha-tierchen.de> In-Reply-To: <20070612.215430.-365729166.imp@bsdimp.com> References: <55286.2001:6f8:101e:0:20e:cff:fe6d:6adb.1181705783.squirrel@webmail.alpha-tierchen.de> <20070612.215430.-365729166.imp@bsdimp.com>
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So this is my patch.
It would be interesting for me to know the effective main clock values for
10.0 Hz and 16.0 Hz oscillators. My board uses a 18.432 Hz oscillator.
Currently I'm working on changing the PCK and MCK on-the-fly via sysctl
MIB which basically works well for me.
Björn
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--- src/sys/arm/at91/at91_pmc.c.orig Wed Jun 13 09:39:36 2007
+++ src/sys/arm/at91/at91_pmc.c Wed Jun 13 09:54:18 2007
@@ -394,16 +394,18 @@
at91_pmc_attach(device_t dev)
{
int err;
+ uint32_t mcfr;
pmc_softc = device_get_softc(dev);
pmc_softc->dev = dev;
if ((err = at91_pmc_activate(dev)) != 0)
return err;
-#if defined(AT91_TSC) | defined (AT91_BWCT)
- at91_pmc_init_clock(pmc_softc, 16000000);
-#else
- at91_pmc_init_clock(pmc_softc, 10000000);
-#endif
+
+ mcfr = RD4(pmc_softc, CKGR_MCFR);
+ if (mcfr & CKGR_MCFR_MAINRDY == 0)
+ return (ENXIO);
+
+ at91_pmc_init_clock(pmc_softc, (mcfr & CKGR_MCFR_MAINF_MASK) * 32768 / 16);
return (0);
}
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