soc/intel/apollolake: Allow configuring the LPC IO registers

Allow configuring the LPC IO registers in the devicetree with:
* gen1_dec
* gen2_dec
* gen3_dec
* gen4_dec

Signed-off-by: Sean Rhodes <sean@starlabs.systems>
Change-Id: I2a7ab3faf927cda76640227feff4e19017442897
Reviewed-on: https://review.coreboot.org/c/coreboot/+/64889
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

3 files changed, 20 insertions, 0 deletions

diff --git a/src/soc/intel/apollolake/bootblock/bootblock.c b/src/soc/intel/apollolake/bootblock/bootblock.c
index 00c47f3d2896..c9b6d93d5091 100644
--- a/src/soc/intel/apollolake/bootblock/bootblock.c
+++ b/src/soc/intel/apollolake/bootblock/bootblock.c
@@ -102,6 +102,9 @@ void bootblock_soc_early_init(void)
 	/* IO Decode Enable */
 	lpc_enable_fixed_io_ranges(io_enables);
 
+	/* Program generic IO Decode Range */
+	pch_enable_lpc();
+
 	if (CONFIG(TPM_ON_FAST_SPI))
 		tpm_enable();
 
diff --git a/src/soc/intel/apollolake/chip.h b/src/soc/intel/apollolake/chip.h
index 2bdabd6e33c4..209937d775fb 100644
--- a/src/soc/intel/apollolake/chip.h
+++ b/src/soc/intel/apollolake/chip.h
@@ -113,6 +113,12 @@ struct soc_intel_apollolake_config {
 	uint16_t lpc_iod;
 	uint16_t lpc_ioe;
 
+	/* Generic IO decode ranges */
+	uint32_t gen1_dec;
+	uint32_t gen2_dec;
+	uint32_t gen3_dec;
+	uint32_t gen4_dec;
+
 	/* Configure LPSS S0ix Enable */
 	uint8_t lpss_s0ix_enable;
 
diff --git a/src/soc/intel/apollolake/lpc.c b/src/soc/intel/apollolake/lpc.c
index 4a5f40f42a1c..21a0f44963b3 100644
--- a/src/soc/intel/apollolake/lpc.c
+++ b/src/soc/intel/apollolake/lpc.c
@@ -5,8 +5,19 @@
 #include <intelblocks/rtc.h>
 #include <soc/pcr_ids.h>
 #include <soc/pm.h>
+#include <soc/intel/common/block/lpc/lpc_def.h>
 #include "chip.h"
 
+void soc_get_gen_io_dec_range(uint32_t gen_io_dec[LPC_NUM_GENERIC_IO_RANGES])
+{
+	const config_t *config = config_of_soc();
+
+	gen_io_dec[0] = config->gen1_dec;
+	gen_io_dec[1] = config->gen2_dec;
+	gen_io_dec[2] = config->gen3_dec;
+	gen_io_dec[3] = config->gen4_dec;
+}
+
 void lpc_soc_init(struct device *dev)
 {
 	const struct soc_intel_apollolake_config *cfg;