[PATCH] arm: mvebu: Espressobin: Set environment variable fdtfile

Andre Heider
2020-09-05T12:07:44Z

Required for the generic distro mechanism.

Linux ships with 4 variants:
marvell/armada-3720-espressobin-v7-emmc.dtb
marvell/armada-3720-espressobin-v7.dtb
marvell/armada-3720-espressobin-emmc.dtb
marvell/armada-3720-espressobin.dtb

Use available information to determine the appropriate filename.

Tested on a v5 board without eMMC.

Signed-off-by: Andre Heider <a.heider@gmail.com>
---
arch/arm/mach-mvebu/Kconfig | 1 +
board/Marvell/mvebu_armada-37xx/board.c | 42 +++++++++++++++++++++++++
2 files changed, 43 insertions(+)

diff --git a/arch/arm/mach-mvebu/Kconfig b/arch/arm/mach-mvebu/Kconfig
index 0d8e0922a2..31f5d26dc2 100644
--- a/arch/arm/mach-mvebu/Kconfig
+++ b/arch/arm/mach-mvebu/Kconfig
@@ -100,6 +100,7 @@ config TARGET_HELIOS4
config TARGET_MVEBU_ARMADA_37XX
bool "Support Armada 37xx platforms"
select ARMADA_3700
+ select BOARD_LATE_INIT
imply SCSI

config TARGET_DB_88F6720
diff --git a/board/Marvell/mvebu_armada-37xx/board.c b/board/Marvell/mvebu_armada-37xx/board.c
index 90bfc139aa..3bf0a08897 100644
--- a/board/Marvell/mvebu_armada-37xx/board.c
+++ b/board/Marvell/mvebu_armada-37xx/board.c
@@ -5,6 +5,7 @@

#include <common.h>
#include <dm.h>
+#include <env.h>
#include <i2c.h>
#include <init.h>
#include <phy.h>
@@ -50,6 +51,22 @@ DECLARE_GLOBAL_DATA_PTR;
#define MVEBU_G2_SMI_PHY_CMD_REG (24)
#define MVEBU_G2_SMI_PHY_DATA_REG (25)

+/*
+ * Memory Controller Registers
+ *
+ * Assembled based on public information:
+ * https://gitlab.nic.cz/turris/mox-boot-builder/-/blob/master/wtmi/main.c#L332-336
+ * https://github.com/MarvellEmbeddedProcessors/mv-ddr-marvell/blob/mv_ddr-armada-18.12/drivers/mv_ddr_mc6.h#L309-L332
+ *
+ * And checked against the written register values for the various topologies:
+ * https://github.com/MarvellEmbeddedProcessors/mv-ddr-marvell/blob/mv_ddr-armada-atf-mainline/a3700/mv_ddr_tim.h
+ */
+#define A3700_CH0_MC_CTRL2_REG MVEBU_REGISTER(0x002c4)
+#define A3700_MC_CTRL2_SDRAM_TYPE_MASK 0xf
+#define A3700_MC_CTRL2_SDRAM_TYPE_OFFS 4
+#define A3700_MC_CTRL2_SDRAM_TYPE_DDR3 2
+#define A3700_MC_CTRL2_SDRAM_TYPE_DDR4 3
+
int board_early_init_f(void)
{
return 0;
@@ -63,6 +80,31 @@ int board_init(void)
return 0;
}

+int board_late_init(void)
+{
+ bool ddr4, emmc;
+
+ if (!of_machine_is_compatible("globalscale,espressobin"))
+ return 0;
+
+ /* If the memory controller has been configured for DDR4, we're running on v7 */
+ ddr4 = ((readl(A3700_CH0_MC_CTRL2_REG) >> A3700_MC_CTRL2_SDRAM_TYPE_OFFS)
+ & A3700_MC_CTRL2_SDRAM_TYPE_MASK) == A3700_MC_CTRL2_SDRAM_TYPE_DDR4;
+
+ emmc = of_machine_is_compatible("globalscale,espressobin-emmc");
+
+ if (ddr4 && emmc)
+ env_set("fdtfile", "marvell/armada-3720-espressobin-v7-emmc.dtb");
+ else if (ddr4)
+ env_set("fdtfile", "marvell/armada-3720-espressobin-v7.dtb");
+ else if (emmc)
+ env_set("fdtfile", "marvell/armada-3720-espressobin-emmc.dtb");
+ else
+ env_set("fdtfile", "marvell/armada-3720-espressobin.dtb");
+
+ return 0;
+}
+
/* Board specific AHCI / SATA enable code */
int board_ahci_enable(void)
{
--
2.28.0