Initial commit

target/linux/mpc85xx/image/spi-loader/drivers/spi/spi-nor.c

@@ -0,0 +1,72 @@
+// SPDX-License-Identifier: BSD-2-Clause
+/*
+ * Copyright (c) 2022 Matthias Schiffer <mschiffer@universe-factory.net>
+ */
+
+#include <spi.h>
+#include <spi-nor.h>
+#include <stdio.h>
+
+#define CMD_READ 0x03
+#define CMD_READ_ID 0x9F
+
+int spi_nor_read_id(void)
+{
+	int ret;
+
+	const uint8_t tx_buf[1] = {CMD_READ_ID};
+	uint8_t rx_buf[3] = {};
+	struct spi_transfer t[2] = {{
+		.tx_buf = tx_buf,
+		.rx_buf = NULL,
+		.len = sizeof(tx_buf),
+	}, {
+		.tx_buf = NULL,
+		.rx_buf = rx_buf,
+		.len = sizeof(rx_buf),
+	}};
+
+	ret = spi_xfer(t, ARRAY_SIZE(t));
+	if (ret) {
+		puts("SPI transfer failed\n");
+		return ret;
+	}
+
+	puts("Flash JECED ID: ");
+	put_array(rx_buf, sizeof(rx_buf));
+
+	return 0;
+}
+
+int spi_nor_read_data(void *dest, size_t pos, size_t len)
+{
+	int ret;
+
+	while (len > 0) {
+		uint8_t cmd[4] = {CMD_READ, pos >> 16, pos >> 8, pos};
+		size_t block_len = min(len, spi_max_xfer() - sizeof(cmd));
+
+		struct spi_transfer t[2] = {{
+			.tx_buf = cmd,
+			.rx_buf = NULL,
+			.len = sizeof(cmd),
+		}, {
+			.tx_buf = NULL,
+			.rx_buf = dest,
+			.len = block_len,
+		}};
+
+		ret = spi_xfer(t, ARRAY_SIZE(t));
+		if (ret) {
+			puts("SPI transfer failed\n");
+			return ret;
+		}
+
+		pos += block_len;
+		dest += block_len;
+		len -= block_len;
+	}
+
+	return 0;
+}
+