arm: mvebu: Espressobin: Set environment variable fdtfile

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.

Fixes booting GRUB EFI arm64 on Fedora.

Reported-by: Dennis Gilmore <dennis@ausil.us>
Signed-off-by: Andre Heider <a.heider@gmail.com>

diff --git a/board/Marvell/mvebu_armada-37xx/board.c b/board/Marvell/mvebu_armada-37xx/board.c
index 7b9c322..eacee15 100644 (file)
--- 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 +80,36 @@ int board_init(void)
        return 0;
 }
 
+#ifdef CONFIG_BOARD_LATE_INIT
+int board_late_init(void)
+{
+       bool ddr4, emmc;
+
+       if (env_get("fdtfile"))
+               return 0;
+
+       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;
+}
+#endif
+
 /* Board specific AHCI / SATA enable code */
 int board_ahci_enable(void)
 {

diff --git a/configs/mvebu_espressobin-88f3720_defconfig b/configs/mvebu_espressobin-88f3720_defconfig
index 5e9fcd1..559aeb0 100644 (file)
--- a/configs/mvebu_espressobin-88f3720_defconfig
+++ b/configs/mvebu_espressobin-88f3720_defconfig
@@ -85,3 +85,4 @@ CONFIG_USB_ETHER_SMSC95XX=y
 CONFIG_SHA1=y
 CONFIG_SHA256=y
 CONFIG_NET_RANDOM_ETHADDR=y
+CONFIG_BOARD_LATE_INIT=y