board: phytec: imx93: Add eeprom-based hardware introspection
The phyCORE-i.MX 93 is available in various variants. Relevant variant
options for the spl/u-boot are:
- with or without HS400 support for the eMMC
- with 1GB ram chip, or 2GB ram chip
The phyCORE's eeprom contains all information about the existing variant
options. Add evaluation of the eeprom data to the spl/u-boot to
enable/disable HS400 and to select the appropriate ram configuration at
startup.
Signed-off-by: Christoph Stoidner <c.stoidner@phytec.de>
Reviewed-by: Wadim Egorov <w.egorov@phytec.de>
Reviewed-by: Yannic Moog <y.moog@phytec.de>
Tested-by: Primoz Fiser <primoz.fiser@norik.com>
diff --git a/board/phytec/common/imx93_som_detection.c b/board/phytec/common/imx93_som_detection.c
new file mode 100644
index 0000000..eb9574d
--- /dev/null
+++ b/board/phytec/common/imx93_som_detection.c
@@ -0,0 +1,111 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2024 PHYTEC Messtechnik GmbH
+ * Author: Primoz Fiser <primoz.fiser@norik.com>
+ */
+
+#include <asm/arch/sys_proto.h>
+#include <dm/device.h>
+#include <dm/uclass.h>
+#include <i2c.h>
+#include <u-boot/crc.h>
+
+#include "imx93_som_detection.h"
+
+extern struct phytec_eeprom_data eeprom_data;
+
+#if IS_ENABLED(CONFIG_PHYTEC_IMX93_SOM_DETECTION)
+
+/* Check if the SoM is actually one of the following products:
+ * - i.MX93
+ *
+ * Returns 0 in case it's a known SoM. Otherwise, returns 1.
+ */
+u8 __maybe_unused phytec_imx93_detect(struct phytec_eeprom_data *data)
+{
+ u8 som;
+
+ if (!data)
+ data = &eeprom_data;
+
+ /* Early API revisions are not supported */
+ if (!data->valid || data->payload.api_rev < PHYTEC_API_REV2)
+ return 1;
+
+ som = data->payload.data.data_api2.som_no;
+ debug("%s: som id: %u\n", __func__, som);
+
+ if (som == PHYTEC_IMX93_SOM && is_imx93())
+ return 0;
+
+ pr_err("%s: SoM ID does not match. Wrong EEPROM data?\n", __func__);
+ return 1;
+}
+
+/*
+ * Filter PHYTEC i.MX93 SoM options by option index
+ *
+ * Returns:
+ * - option value
+ * - PHYTEC_EEPROM_INVAL when the data is invalid
+ *
+ */
+u8 __maybe_unused phytec_imx93_get_opt(struct phytec_eeprom_data *data,
+ enum phytec_imx93_option_index idx)
+{
+ char *opt;
+ u8 opt_id;
+
+ if (!data)
+ data = &eeprom_data;
+
+ if (!data->valid || data->payload.api_rev < PHYTEC_API_REV2)
+ return PHYTEC_EEPROM_INVAL;
+
+ opt = phytec_get_opt(data);
+ if (opt)
+ opt_id = PHYTEC_GET_OPTION(opt[idx]);
+ else
+ opt_id = PHYTEC_EEPROM_INVAL;
+
+ debug("%s: opt[%d] id: %u\n", __func__, idx, opt_id);
+ return opt_id;
+}
+
+/*
+ * Filter PHYTEC i.MX93 SoM voltage
+ *
+ * Returns:
+ * - PHYTEC_IMX93_VOLTAGE_1V8 or PHYTEC_IMX93_VOLTAGE_3V3
+ * - PHYTEC_EEPROM_INVAL when the data is invalid
+ *
+ */
+enum phytec_imx93_voltage __maybe_unused phytec_imx93_get_voltage(struct phytec_eeprom_data *data)
+{
+ u8 option = phytec_imx93_get_opt(data, PHYTEC_IMX93_OPT_FEAT);
+
+ if (option == PHYTEC_EEPROM_INVAL)
+ return PHYTEC_IMX93_VOLTAGE_INVALID;
+ return (option & 0x01) ? PHYTEC_IMX93_VOLTAGE_1V8 : PHYTEC_IMX93_VOLTAGE_3V3;
+}
+
+#else
+
+inline u8 __maybe_unused phytec_imx93_detect(struct phytec_eeprom_data *data)
+{
+ return 1;
+}
+
+inline u8 __maybe_unused phytec_imx93_get_opt(struct phytec_eeprom_data *data,
+ enum phytec_imx93_option_index idx)
+{
+ return PHYTEC_EEPROM_INVAL;
+}
+
+inline enum phytec_imx93_voltage __maybe_unused phytec_imx93_get_voltage
+ (struct phytec_eeprom_data *data)
+{
+ return PHYTEC_EEPROM_INVAL;
+}
+
+#endif /* IS_ENABLED(CONFIG_PHYTEC_IMX93_SOM_DETECTION) */