mb/kontron: Add Kontron mAL10 COMe module support

This patch adds support for the Kontron mAL10 COMe module with the
Apollo Lake SoC together with Kontron T10-TNI carrierboard.

Working:
  - UART console and I2C on Kontron kempld;
  - USB2/3
  - Ethernet controller
  - eMMC
  - SATA
  - PCIe ports
  - IGD/DP
  - SMBus
  - HWM

Not tested:
  - IGD/LVDS
  - SDIO

TODO:
  - HDA (codec IDT 92HD73C1X5, currently disabled)

Tested payloads:
  - SeaBIOS
  - Tianocore, UEFIPayload - without video, EFI-shell in console only

Tested on COMe module with Intel Atom x5-E3940 processor (4 Core,
1.6/1.8GHz, 9.5W TDP). Xubuntu 18.04.2 was used as a bootable OS
(5.0.0-32-generic linux kernel)

Change-Id: Ib8432e10396f77eb05a71af1ccaaa4437a2e43ea
Signed-off-by: Maxim Polyakov <max.senia.poliak@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39133
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

1 files changed, 47 insertions, 0 deletions

diff --git a/src/mainboard/kontron/mal10/ramstage.c b/src/mainboard/kontron/mal10/ramstage.c
new file mode 100644
index 0000000000..48194e6848
--- /dev/null
+++ b/src/mainboard/kontron/mal10/ramstage.c
@@ -0,0 +1,47 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <soc/ramstage.h>
+#include <carrier/gpio.h>
+#include <stddef.h>
+
+void mainboard_silicon_init_params(FSP_S_CONFIG *silconfig)
+{
+	carrier_gpio_configure();
+
+	/*
+	 * CPU Power Management Configuration correspond to the BIOS Setup menu settings
+	 * in the AMI UEFI v112.
+	 * TODO: move these FSP options to device tree
+	 */
+	silconfig->EnableCx = 1;            /* Enable CPU power states */
+	silconfig->C1e = 1;                 /* enable Enhanced C-states */
+	/*
+	 * Attention! Do not change PkgCStateLimit! This causes spikes in the power
+	 * consumption of the SoC when the system comes out of power saving mode, and
+	 * voltage sagging at the output of DC-DC converters on the COMe module. In the
+	 * AMI BIOS Setup shows this parameter, but does not allow changing it.
+	 */
+	silconfig->PkgCStateLimit = 0;      /* Max Pkg Cstate : PkgC0C1 */
+	silconfig->MaxCoreCState = 3;       /* Max Core C-State : C6 */
+	silconfig->CStateAutoDemotion = 0;  /* Disable C1 and C3 Auto-demotion */
+	silconfig->CStateUnDemotion = 0;    /* Disable C1 and C3 Un-demotion */
+	silconfig->PkgCStateDemotion = 1;   /* enable package Cstate demotion */
+	silconfig->PkgCStateUnDemotion = 1; /* enable package Cstate undemotion */
+	silconfig->PmSupport = 1;           /* GT PM Support */
+	silconfig->EnableRenderStandby = 1; /* enable render standby */
+	silconfig->LPSS_S0ixEnable = 1;     /* LPSS IOSF PMCTL S0ix Enable */
+	silconfig->InitS3Cpu = 1;           /* initialize CPU during S3 resume */
+
+	/* Override High Precision Timer options */
+	silconfig->HpetBdfValid = 1;
+	silconfig->HpetBusNumber = 0xFA;
+	silconfig->HpetDeviceNumber = 0x0F;
+	silconfig->HpetFunctionNumber = 0;
+
+	/* Override APIC options */
+	silconfig->IoApicId = 1;
+	silconfig->IoApicBdfValid = 1;
+	silconfig->IoApicBusNumber = 0xFA;
+	silconfig->IoApicDeviceNumber = 0x1F;
+	silconfig->IoApicFunctionNumber = 0;
+}