[PATCH v2 05/26] soundwire: intel/cadence: set ip_offset at run-time

[Bard Liao <yung-chuan.liao@xxxxxxxxxxxxxxx>]

From: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>

Select relevant ip-offset depending on hardware version. This offset
is used to access MCP_ or IP_MCP_ registers with a fixed offset.

For existing platforms, the offset is exactly zero. Starting with
LunarLake, the offset is 0x4000.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
Reviewed-by: Rander Wang <rander.wang@xxxxxxxxx>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@xxxxxxxxxxxxxxx>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@xxxxxxxxxxxxxxx>
Signed-off-by: Bard Liao <yung-chuan.liao@xxxxxxxxxxxxxxx>
---
 drivers/soundwire/cadence_master.h  | 2 ++
 drivers/soundwire/intel.h           | 2 ++
 drivers/soundwire/intel_auxdevice.c | 1 +
 drivers/soundwire/intel_init.c      | 2 ++
 4 files changed, 7 insertions(+)

diff --git a/drivers/soundwire/cadence_master.h b/drivers/soundwire/cadence_master.h
index 27c56274217f..86a450b1cbda 100644
--- a/drivers/soundwire/cadence_master.h
+++ b/drivers/soundwire/cadence_master.h
@@ -14,6 +14,8 @@
  */
 #define CDNS_MCP_IP_MAX_CMD_LEN		32
 
+#define SDW_CADENCE_MCP_IP_OFFSET	0x4000
+
 /**
  * struct sdw_cdns_pdi: PDI (Physical Data Interface) instance
  *
diff --git a/drivers/soundwire/intel.h b/drivers/soundwire/intel.h
index 51aa42a5a824..1b23292bb8be 100644
--- a/drivers/soundwire/intel.h
+++ b/drivers/soundwire/intel.h
@@ -10,6 +10,7 @@
  * @hw_ops: platform-specific ops
  * @mmio_base: mmio base of SoundWire registers
  * @registers: Link IO registers base
+ * @ip_offset: offset for MCP_IP registers
  * @shim: Audio shim pointer
  * @shim_vs: Audio vendor-specific shim pointer
  * @alh: ALH (Audio Link Hub) pointer
@@ -28,6 +29,7 @@ struct sdw_intel_link_res {
 
 	void __iomem *mmio_base; /* not strictly needed, useful for debug */
 	void __iomem *registers;
+	u32 ip_offset;
 	void __iomem *shim;
 	void __iomem *shim_vs;
 	void __iomem *alh;
diff --git a/drivers/soundwire/intel_auxdevice.c b/drivers/soundwire/intel_auxdevice.c
index b21e86084f7b..fcdf4f2d60e3 100644
--- a/drivers/soundwire/intel_auxdevice.c
+++ b/drivers/soundwire/intel_auxdevice.c
@@ -144,6 +144,7 @@ static int intel_link_probe(struct auxiliary_device *auxdev,
 	sdw->link_res = &ldev->link_res;
 	cdns->dev = dev;
 	cdns->registers = sdw->link_res->registers;
+	cdns->ip_offset = sdw->link_res->ip_offset;
 	cdns->instance = sdw->instance;
 	cdns->msg_count = 0;
 
diff --git a/drivers/soundwire/intel_init.c b/drivers/soundwire/intel_init.c
index e0023af9e0e1..43d339c6bcee 100644
--- a/drivers/soundwire/intel_init.c
+++ b/drivers/soundwire/intel_init.c
@@ -66,10 +66,12 @@ static struct sdw_intel_link_dev *intel_link_dev_register(struct sdw_intel_res *
 	if (!res->ext) {
 		link->registers = res->mmio_base + SDW_LINK_BASE
 			+ (SDW_LINK_SIZE * link_id);
+		link->ip_offset = 0;
 		link->shim = res->mmio_base + res->shim_base;
 		link->alh = res->mmio_base + res->alh_base;
 	} else {
 		link->registers = res->mmio_base + SDW_IP_BASE(link_id);
+		link->ip_offset = SDW_CADENCE_MCP_IP_OFFSET;
 		link->shim = res->mmio_base +  SDW_SHIM2_GENERIC_BASE(link_id);
 		link->shim_vs = res->mmio_base + SDW_SHIM2_VS_BASE(link_id);
 	}
-- 
2.25.1