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uniphier: revise SCP protocol handshake 

When the SoC issues a command IRQ to SCP, SCP sets STMTOBEIRQ as ACK.
The SoC must wait for it before issuing the next command.

This commit makes sure to meet the requirement.

Signed-off-by: Dai Okamura <okamura.dai@socionext.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
This commit is contained in:
Dai Okamura 2018-10-05 08:56:24 +09:00 committed by Masahiro Yamada
parent 8be7850fd6
commit e6a90288c3
1 changed files with 6 additions and 0 deletions
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6
plat/socionext/uniphier/uniphier_scp.c
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@ -12,7 +12,9 @@
#define UNIPHIER_ROM_RSV3 0x5980120c
#define UNIPHIER_STMBE2COM 0x5f800030
#define UNIPHIER_STMTOBEIRQ 0x5f800060
#define UNIPHIER_BETOSTMIRQ0PT 0x5f800070
#define UNIPHIER_BEIRQCLRPT 0x5f800072
#define UNIPHIER_SCP_READY_MAGIC 0x0000b6a5
@ -59,6 +61,10 @@ static void uniphier_scp_send_packet(const uint8_t *packet, int packet_len)
}
mmio_write_8(UNIPHIER_BETOSTMIRQ0PT, 0x55);
while (!(mmio_read_32(UNIPHIER_STMTOBEIRQ) & BIT(1)))
;
mmio_write_8(UNIPHIER_BEIRQCLRPT, BIT(1) | BIT(0));
}
static void uniphier_scp_send_cmd(const uint8_t *cmd, int cmd_len)