[PATCH u-boot-marvell 2/8] arm: mvebu: turris_omnia: Provide env_sf_get_env_addr() function

["Pali Rohár" <pali@kernel.org>]

BootROM maps SPI Flash to fixed address 0xD4000000 and this mapping is
active also when BootROM is executing binary kwbimage headers, which
includes also U-Boot SPL.

Therefore no initialization code is required to access SPI Flags from
U-Boot SPL. In proper U-Boot it is remapped to other location.

So in mvebu implementation of env_sf_get_env_addr() function returns
0xD4000000 when running in SPL and NULL when in proper U-Boot.

This change would allow to use U-Boot ENV in U-Boot SPL. Normally it is not
possible to read ENV because it is too big and U-Boot SPL does not have
such big malloc() pool to real all ENV variables.

Signed-off-by: Pali Rohár <pali@kernel.org>
---
 board/CZ.NIC/turris_omnia/turris_omnia.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/board/CZ.NIC/turris_omnia/turris_omnia.c b/board/CZ.NIC/turris_omnia/turris_omnia.c
index 33cec6587e19..a93af6c5b877 100644
--- a/board/CZ.NIC/turris_omnia/turris_omnia.c
+++ b/board/CZ.NIC/turris_omnia/turris_omnia.c
@@ -243,6 +243,16 @@ static bool omnia_detect_sata(void)
 	return stsword & MSATA_IND_STSBIT ? true : false;
 }
 
+void *env_sf_get_env_addr(void)
+{
+	/* SPI Flash is mapped to address 0xD4000000 only in SPL */
+#ifdef CONFIG_SPL_BUILD
+	return (void *)0xD4000000 + CONFIG_ENV_OFFSET;
+#else
+	return NULL;
+#endif
+}
+
 int hws_board_topology_load(struct serdes_map **serdes_map_array, u8 *count)
 {
 	if (omnia_detect_sata()) {
-- 
2.20.1