arm: mvebu: turris_omnia: Show MCU type in show_board_info()

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@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>
Reviewed-by: Marek Behún <kabel@kernel.org>

diff --git a/board/CZ.NIC/turris_omnia/turris_omnia.c b/board/CZ.NIC/turris_omnia/turris_omnia.c
index 5921769..dab5711 100644 (file)
--- 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");