soc/intel/broadwell: Enable LPC/SIO setup in bootblock

This allows for serial console during the bootblock and enables
bootblock console by default.

Change-Id: I7746e4f819486d6142c96bc4c7480076fbfdfbde
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/30385
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>

1 files changed, 49 insertions, 0 deletions

diff --git a/src/soc/intel/broadwell/bootblock/pch.c b/src/soc/intel/broadwell/bootblock/pch.c
index 1301610947..590961b361 100644
--- a/src/soc/intel/broadwell/bootblock/pch.c
+++ b/src/soc/intel/broadwell/bootblock/pch.c
@@ -19,6 +19,9 @@
 #include <soc/pci_devs.h>
 #include <soc/rcba.h>
 #include <soc/spi.h>
+#include <reg_script.h>
+#include <soc/pm.h>
+#include <soc/romstage.h>
 #include <cpu/intel/car/bootblock.h>
 
 /*
@@ -67,10 +70,56 @@ static void set_spi_speed(void)
 	SPIBAR8(SPIBAR_SSFC + 2) = ssfc;
 }
 
+const struct reg_script pch_early_init_script[] = {
+	/* Setup southbridge BARs */
+	REG_PCI_WRITE32(RCBA, RCBA_BASE_ADDRESS | 1),
+	REG_PCI_WRITE32(PMBASE, ACPI_BASE_ADDRESS | 1),
+	REG_PCI_WRITE8(ACPI_CNTL, ACPI_EN),
+	REG_PCI_WRITE32(GPIO_BASE, GPIO_BASE_ADDRESS | 1),
+	REG_PCI_WRITE8(GPIO_CNTL, GPIO_EN),
+
+	/* Set COM1/COM2 decode range */
+	REG_PCI_WRITE16(LPC_IO_DEC, 0x0010),
+	/* Enable legacy decode ranges */
+	REG_PCI_WRITE16(LPC_EN, CNF1_LPC_EN | CNF2_LPC_EN | GAMEL_LPC_EN |
+			COMA_LPC_EN | KBC_LPC_EN | MC_LPC_EN),
+
+	/* Enable IOAPIC */
+	REG_MMIO_WRITE16(RCBA_BASE_ADDRESS + OIC, 0x0100),
+	/* Read back for posted write */
+	REG_MMIO_READ16(RCBA_BASE_ADDRESS + OIC),
+
+	/* Set HPET address and enable it */
+	REG_MMIO_RMW32(RCBA_BASE_ADDRESS + HPTC, ~3, (1 << 7)),
+	/* Read back for posted write */
+	REG_MMIO_READ32(RCBA_BASE_ADDRESS + HPTC),
+	/* Enable HPET to start counter */
+	REG_MMIO_OR32(HPET_BASE_ADDRESS + 0x10, (1 << 0)),
+
+	/* Disable reset */
+	REG_MMIO_OR32(RCBA_BASE_ADDRESS + GCS, (1 << 5)),
+	/* TCO timer halt */
+	REG_IO_OR16(ACPI_BASE_ADDRESS + TCO1_CNT, TCO_TMR_HLT),
+
+	/* Enable upper 128 bytes of CMOS */
+	REG_MMIO_OR32(RCBA_BASE_ADDRESS + RC, (1 << 2)),
+
+	/* Disable unused device (always) */
+	REG_MMIO_OR32(RCBA_BASE_ADDRESS + FD, PCH_DISABLE_ALWAYS),
+
+	REG_SCRIPT_END
+};
+
+static void pch_early_lpc(void)
+{
+	reg_script_run_on_dev(PCH_DEV_LPC, pch_early_init_script);
+}
+
 void bootblock_early_southbridge_init(void)
 {
 	map_rcba();
 	enable_spi_prefetch();
 	enable_port80_on_lpc();
 	set_spi_speed();
+	pch_early_lpc();
 }