ddr: marvell: a38x: add support for twin-die combined memory device

commit 6285efb8a118940877522c4c07bd7c64569b4f5f upstream.

the twin-die combined memory device should be treatened as X8
device and not as X16 one

Signed-off-by: Moti Buskila <motib@marvell.com>
Reviewed-by: Kostya Porotchkin <kostap@marvell.com>
[ - the default value for twin_die_combined is set to NOT_COMBINED for
    all boards, as this was default behaviour prior this change ]
Signed-off-by: Marek Behún <marek.behun@nic.cz>
Tested-by: Chris Packham <chris.packham@alliedtelesis.co.nz>

board/CZ.NIC/turris_omnia/turris_omnia.c

@@ -286,6 +286,7 @@ static struct mv_ddr_topology_map board_topology_map_1g = {
 	    MV_DDR_TIM_2T} },		/* timing */
 	BUS_MASK_32BIT,			/* Busses mask */
 	MV_DDR_CFG_DEFAULT,		/* ddr configuration data source */
+	NOT_COMBINED,			/* ddr twin-die combined */
 	{ {0} },			/* raw spd data */
 	{0}				/* timing parameters */
 };
@@ -308,6 +309,7 @@ static struct mv_ddr_topology_map board_topology_map_2g = {
 	    MV_DDR_TIM_2T} },		/* timing */
 	BUS_MASK_32BIT,			/* Busses mask */
 	MV_DDR_CFG_DEFAULT,		/* ddr configuration data source */
+	NOT_COMBINED,			/* ddr twin-die combined */
 	{ {0} },			/* raw spd data */
 	{0}				/* timing parameters */
 };

board/Marvell/db-88f6820-amc/db-88f6820-amc.c

@@ -73,6 +73,7 @@ static struct mv_ddr_topology_map board_topology_map = {
 	    MV_DDR_TIM_DEFAULT} },	/* timing */
 	BUS_MASK_32BIT,			/* Busses mask */
 	MV_DDR_CFG_DEFAULT,		/* ddr configuration data source */
+	NOT_COMBINED,			/* ddr twin-die combined */
 	{ {0} },			/* raw spd data */
 	{0}				/* timing parameters */
 };

board/Marvell/db-88f6820-gp/db-88f6820-gp.c

@@ -94,6 +94,7 @@ static struct mv_ddr_topology_map board_topology_map = {
 	    MV_DDR_TIM_DEFAULT} },	/* timing */
 	BUS_MASK_32BIT,			/* Busses mask */
 	MV_DDR_CFG_DEFAULT,		/* ddr configuration data source */
+	NOT_COMBINED,			/* ddr twin-die combined */
 	{ {0} },			/* raw spd data */
 	{0}				/* timing parameters */
 };

board/alliedtelesis/x530/x530.c

@@ -68,6 +68,7 @@ static struct mv_ddr_topology_map board_topology_map = {
 	    MV_DDR_TIM_2T} },		/* timing */
 	BUS_MASK_32BIT_ECC,		/* subphys mask */
 	MV_DDR_CFG_DEFAULT,		/* ddr configuration data source */
+	NOT_COMBINED,			/* ddr twin-die combined */
 	{ {0} },			/* raw spd data */
 	{0},				/* timing parameters */
 	{ {0} },			/* electrical configuration */

board/gdsys/a38x/controlcenterdc.c

@@ -71,6 +71,7 @@ static struct mv_ddr_topology_map ddr_topology_map = {
 	    MV_DDR_TIM_DEFAULT} },	/* timing */
 	BUS_MASK_32BIT,			/* Busses mask */
 	MV_DDR_CFG_DEFAULT,		/* ddr configuration data source */
+	NOT_COMBINED,			/* ddr twin-die combined */
 	{ {0} },			/* raw spd data */
 	{0}				/* timing parameters */
 

board/kobol/helios4/helios4.c

@@ -71,6 +71,7 @@ static struct mv_ddr_topology_map board_topology_map = {
 	    MV_DDR_TIM_DEFAULT} },	/* timing */
 	BUS_MASK_32BIT_ECC,		/* Busses mask */
 	MV_DDR_CFG_DEFAULT,		/* ddr configuration data source */
+	NOT_COMBINED,			/* ddr twin-die combined */
 	{ {0} },			/* raw spd data */
 	{0}				/* timing parameters */
 };

board/solidrun/clearfog/clearfog.c

@@ -142,6 +142,7 @@ static struct mv_ddr_topology_map board_topology_map = {
 	    MV_DDR_TIM_DEFAULT} },	/* timing */
 	BUS_MASK_32BIT,			/* Busses mask */
 	MV_DDR_CFG_DEFAULT,		/* ddr configuration data source */
+	NOT_COMBINED,			/* ddr twin-die combined */
 	{ {0} },			/* raw spd data */
 	{0},				/* timing parameters */
 	{ {0} },			/* electrical configuration */

drivers/ddr/marvell/a38x/ddr_topology_def.h

@@ -14,6 +14,11 @@
 #define MV_DDR_MAX_BUS_NUM	9
 #define MV_DDR_MAX_IFACE_NUM	1
 
+enum mv_ddr_twin_die {
+	COMBINED,
+	NOT_COMBINED,
+};
+
 struct bus_params {
 	/* Chip Select (CS) bitmask (bits 0-CS0, bit 1- CS1 ...) */
 	u8 cs_bitmask;
@@ -47,6 +52,9 @@ struct if_params {
 	/* The DDR frequency for each interfaces */
 	enum mv_ddr_freq memory_freq;
 
+    /* ddr twin-die */
+	enum mv_ddr_twin_die twin_die_combined;
+
 	/*
 	 * delay CAS Write Latency
 	 * - 0 for using default value (jedec suggested)
@@ -113,6 +121,9 @@ struct mv_ddr_topology_map {
 	/* source of ddr configuration data */
 	enum mv_ddr_cfg_src cfg_src;
 
+	/* ddr twin-die */
+	enum mv_ddr_twin_die twin_die_combined;
+
 	/* raw spd data */
 	union mv_ddr_spd_data spd_data;
 
@@ -193,6 +204,7 @@ struct mv_ddr_iface {
 
 	/* ddr interface topology map */
 	struct mv_ddr_topology_map tm;
+
 };
 
 struct mv_ddr_iface *mv_ddr_iface_get(void);

drivers/ddr/marvell/a38x/mv_ddr_topology.c

@@ -127,6 +127,11 @@ int mv_ddr_topology_map_update(void)
 		speed_bin_index = iface_params->speed_bin_index;
 		freq = iface_params->memory_freq;
 
+		if (tm->twin_die_combined == COMBINED) {
+			iface_params->bus_width = MV_DDR_DEV_WIDTH_8BIT;
+			iface_params->memory_size -= 1;
+		}
+
 		if (iface_params->cas_l == 0)
 			iface_params->cas_l = mv_ddr_cl_val_get(speed_bin_index, freq);
 
@@ -281,7 +286,6 @@ unsigned long long mv_ddr_mem_sz_per_cs_get(void)
 	mem_sz_per_cs = (unsigned long long)mem_size[iface_params->memory_size] *
 			(unsigned long long)sphys /
 			(unsigned long long)sphys_per_dunit;
-
 	return mem_sz_per_cs;
 }