Patch set updated for coreboot: a20c9dd AMD SB800: don't switch clock from 14 to 48 MHz for smscsuperio
Jens Rottmann (JRottmann@LiPPERTembedded.de) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/2454
-gerrit
commit a20c9dd8ab5980f7ca55a4fb4c5c4dac4c46ee3d Author: Jens Rottmann JRottmann@LiPPERTembedded.de Date: Tue Feb 19 15:01:06 2013 +0100
AMD SB800: don't switch clock from 14 to 48 MHz for smscsuperio
The power up default for 14M_25M_48M_OSC is 14 MHz. sb800/bootblock.c changes this to 48 MHz, which is the correct value for almost all SIOs. However, not for 'smscsuperio' (SMSC SCH311x), which needs the original 14 MHz. We could switch back to 14 in the mainboard's romstage.c, but then the clock frequency would change twice.
This patch skips the SB800 clock switch if the SIO Kconfig requests 14 MHz. This does not affect any boards currently in the repository (yet).
Change-Id: Icff41fd88dc41c08f3700ab4f786852f04eff2a4 Signed-off-by: Jens Rottmann JRottmann@LiPPERTembedded.de --- src/southbridge/amd/cimx/sb800/bootblock.c | 13 ++++++++++--- src/superio/Kconfig | 3 +++ src/superio/smsc/Kconfig | 1 + 3 files changed, 14 insertions(+), 3 deletions(-)
diff --git a/src/southbridge/amd/cimx/sb800/bootblock.c b/src/southbridge/amd/cimx/sb800/bootblock.c index 0a339b0..d9a04f0 100644 --- a/src/southbridge/amd/cimx/sb800/bootblock.c +++ b/src/southbridge/amd/cimx/sb800/bootblock.c @@ -97,10 +97,17 @@ static void enable_clocks(void) reg8 &= ~(1 << 1); outb(reg8, 0xCD7);
- // Program SB800 MiscCntrl Device_CLK1_sel for 48 MHz (default is 14 MHz) + // Program SB800 MiscClkCntrl register to configure clock output on the + // 14M_25M_48M_OSC ball usually used for the Super-I/O. + // Almost all SIOs need 48 MHz, only the SMSC SCH311x wants 14 MHz, + // which is the SB800's power up default. We could switch back to 14 + // in the mainboard's romstage.c, but then the clock frequency would + // change twice. reg32 = *acpi_mmio; - reg32 &= ~((1 << 0) | (1 << 2)); - reg32 |= 1 << 1; + reg32 &= ~((1 << 2) | (3 << 0)); // enable, 14 MHz (power up default) +#ifndef CONFIG_SUPERIO_WANTS_14MHZ_CLOCK + reg32 |= 2 << 0; // Device_CLK1_sel = 48 MHz +#endif *acpi_mmio = reg32; }
diff --git a/src/superio/Kconfig b/src/superio/Kconfig index 00fee97..d0ca249 100644 --- a/src/superio/Kconfig +++ b/src/superio/Kconfig @@ -17,6 +17,9 @@ ## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA ##
+config SUPERIO_WANTS_14MHZ_CLOCK + bool + source src/superio/fintek/Kconfig source src/superio/intel/Kconfig source src/superio/ite/Kconfig diff --git a/src/superio/smsc/Kconfig b/src/superio/smsc/Kconfig index 8d66fc5..1a3b709 100644 --- a/src/superio/smsc/Kconfig +++ b/src/superio/smsc/Kconfig @@ -44,6 +44,7 @@ config SUPERIO_SMSC_MEC1308 bool config SUPERIO_SMSC_SMSCSUPERIO bool + select SUPERIO_WANTS_14MHZ_CLOCK config SUPERIO_SMSC_SIO1036 bool config SUPERIO_SMSC_SCH4037
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Jens Rottmann