lynxpoint: Basic configuration of SerialIO devices

This adds configuration of SerialIO devices in the Lynxpoint-LP
chipset.  This includes DMA, I2C, SPI, UART, and SDIO controllers.

There is assorted magic setup necessary for the devices and
while it is similar for each device there are subtle differences
in some register settings.

These devices must be put into "ACPI Mode" in order to take
advantage of S0ix.  When in ACPI mode the allocated PCI BARs
must be passed to ACPI so it can be relayed to the OS.  When
the devices are in ACPI mode BAR0+BAR1 is saved into ACPI NVS
and then updated and returned when the OS calls _CRS.

Note that is is not entirely complete yet.  We need to update
the IASL compiler in our build environment to support ACPI 5.0
in order to be able to pass the FixedDMA entries to the kernel.
There are also no ACPI methods defined yet to do D0->D3->D0
transitions for actually entering/exiting S0ix states.

This is hard to test right now because our kernel does not support
any of these devices in ACPI mode.  I was able to build and test
the upstream bleeding-edge branch of the linux-pm git tree.  With
that tree I was able to enumerate and load the driver for the
DesignWare I2C driver and attempt to probe the I2C bus -- although
there are no devices attatched.

I am also able to see the resources from ACPI in /proc/iomem get
reserved properly in the kernel.

Change-Id: Ie311addd6a25f3b7edf3388fe68c1cd691a0a500
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: http://review.coreboot.org/2971
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/southbridge/intel/lynxpoint/Makefile.inc b/src/southbridge/intel/lynxpoint/Makefile.inc
index 04fa2f83b9..7d1f894385 100644
--- a/src/southbridge/intel/lynxpoint/Makefile.inc
+++ b/src/southbridge/intel/lynxpoint/Makefile.inc
@@ -32,6 +32,7 @@ ramstage-y += sata.c
 ramstage-y += usb_ehci.c
 ramstage-y += me_9.x.c
 ramstage-y += smbus.c
+ramstage-$(CONFIG_INTEL_LYNXPOINT_LP) += serialio.c
 
 ramstage-y += rcba.c
 ramstage-y += me_status.c