gma: Add `Cannon_Point` PCH
It almost behaves the same as its predecessors Union and Sunrise
Point. GMBUS pins and panel and backlight controls are updated to
those of Broxton. It also allows an alternative `Raw Clock` of
19.2MHz.
Change-Id: I86fe26a351d2c3c736b6acc85f718fd103d276bb
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/libgfxinit/+/48763
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
diff --git a/common/hw-gfx-gma.adb b/common/hw-gfx-gma.adb
index 3305aeb..d1ae1a0 100644
--- a/common/hw-gfx-gma.adb
+++ b/common/hw-gfx-gma.adb
@@ -85,12 +85,26 @@
----------------------------------------------------------------------------
- PCH_RAWCLK_FREQ_MASK : constant := 16#3ff# * 2 ** 0;
+ PCH_RAWCLK_FREQ_MASK : constant :=
+ (if Config.Has_Fractional_RawClk then 16#3fff# * 2 ** 16 else 16#3ff# * 2 ** 0);
function PCH_RAWCLK_FREQ (Freq : Frequency_Type) return Word32
is
begin
- return Word32 (Freq / 1_000_000);
+ if Config.Has_Fractional_RawClk then
+ declare
+ Fraction_K : constant Int64 := Freq / 1_000 mod 1_000;
+ Freq32 : Word32 := Shift_Left (Word32 (Freq / 1_000_000), 16);
+ begin
+ if Fraction_K /= 0 then
+ Freq32 := Freq32 or Shift_Left
+ (Word32 (Div_Round_Closest (1_000, Fraction_K) - 1), 26);
+ end if;
+ return Freq32;
+ end;
+ else
+ return Word32 (Freq / 1_000_000);
+ end if;
end PCH_RAWCLK_FREQ;
----------------------------------------------------------------------------