[PATCH 1/2] arm: mvebu: turris_omnia: Show MCU type in show_board_info()

[Pali Rohár]

Different Turris Omnia HW board revisions contains different MCU.
Show type in show_board_info() to easily identify which MCU is populated.

Signed-off-by: Pali Rohár <pali at kernel.org>
---
 board/CZ.NIC/turris_omnia/turris_omnia.c | 45 ++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/board/CZ.NIC/turris_omnia/turris_omnia.c b/board/CZ.NIC/turris_omnia/turris_omnia.c
index b169abca0956..6fc2018c1cfb 100644
--- a/board/CZ.NIC/turris_omnia/turris_omnia.c
+++ b/board/CZ.NIC/turris_omnia/turris_omnia.c
@@ -62,13 +62,27 @@ enum mcu_commands {
 	CMD_GET_STATUS_WORD	= 0x01,
 	CMD_GET_RESET		= 0x09,
 	CMD_WATCHDOG_STATE	= 0x0b,
+
+	/* available if STS_FEATURES_SUPPORTED bit set in status word */
+	CMD_GET_FEATURES	= 0x10,
 };
 
 enum status_word_bits {
+	STS_MCU_TYPE_MASK	= GENMASK(1, 0),
+	STS_MCU_TYPE_STM32	= 0,
+	STS_MCU_TYPE_GD32	= 1,
+	STS_MCU_TYPE_MKL	= 2,
+	STS_MCU_TYPE_UNKN	= 3,
+	STS_FEATURES_SUPPORTED	= BIT(2),
 	CARD_DET_STSBIT		= 0x0010,
 	MSATA_IND_STSBIT	= 0x0020,
 };
 
+/* CMD_GET_FEATURES */
+enum features_e {
+	FEAT_PERIPH_MCU		= BIT(0),
+};
+
 /*
  * Those values and defines are taken from the Marvell U-Boot version
  * "u-boot-2013.01-2014_T3.0"
@@ -371,6 +385,36 @@ static int omnia_get_ram_size_gb(void)
 	return ram_size;
 }
 
+static const char * const omnia_get_mcu_type(void)
+{
+	static const char * const mcu_types[] = {
+		[STS_MCU_TYPE_STM32] = "STM32",
+		[STS_MCU_TYPE_GD32]  = "GD32",
+		[STS_MCU_TYPE_MKL]   = "MKL",
+		[STS_MCU_TYPE_UNKN]  = "unknown",
+	};
+	static const char * const mcu_types_with_perip_resets[] = {
+		[STS_MCU_TYPE_STM32] = "STM32 (with peripheral resets)",
+		[STS_MCU_TYPE_GD32]  = "GD32 (with peripheral resets)",
+		[STS_MCU_TYPE_MKL]   = "MKL (with peripheral resets)",
+		[STS_MCU_TYPE_UNKN]  = "unknown (with peripheral resets)",
+	};
+	u16 stsword, features;
+	int ret;
+
+	ret = omnia_mcu_read(CMD_GET_STATUS_WORD, &stsword, sizeof(stsword));
+	if (ret)
+		return "unknown";
+
+	if (stsword & STS_FEATURES_SUPPORTED) {
+		ret = omnia_mcu_read(CMD_GET_FEATURES, &features, sizeof(features));
+		if (ret == 0 && (features & FEAT_PERIPH_MCU))
+			return mcu_types_with_perip_resets[stsword & STS_MCU_TYPE_MASK];
+	}
+
+	return mcu_types[stsword & STS_MCU_TYPE_MASK];
+}
+
 /*
  * Define the DDR layout / topology here in the board file. This will
  * be used by the DDR3 init code in the SPL U-Boot version to configure
@@ -688,6 +732,7 @@ int show_board_info(void)
 
 	err = turris_atsha_otp_get_serial_number(&version_num, &serial_num);
 	printf("Model: Turris Omnia\n");
+	printf("  MCU type: %s\n", omnia_get_mcu_type());
 	printf("  RAM size: %i MiB\n", omnia_get_ram_size_gb() * 1024);
 	if (err)
 		printf("  Serial Number: unknown\n");
-- 
2.20.1