drivers: flash: andes_qspi: Fix the bug when rx length exceeds 512 bytes

ATCSPI hardware limits single transfer to 512 bytes, so when reading
data over 512 bytes, it needs to be split into multiple transfers

Signed-off-by: Kevin Wang <[email protected]>

Author: Kevin Wang

drivers/flash/flash_andes_qspi.c

@@ -21,6 +21,9 @@
 
 LOG_MODULE_REGISTER(flash_andes, CONFIG_FLASH_LOG_LEVEL);
 
+/* ATCSPI200 transfer count is limited to 512 bytes. */
+#define MAX_TRANSFER_CNT (512)
+
 /* Indicates that an access command includes bytes for the address.
  * If not provided the opcode is not followed by address bytes.
  */
@@ -304,6 +307,8 @@ static int flash_andes_qspi_read(const struct device *dev,
 				 off_t addr, void *dest, size_t size)
 {
 	const size_t flash_size = dev_flash_size(dev);
+	size_t to_read = size;
+
 	int ret;
 
 	/* should be between 0 and flash size */
@@ -317,8 +322,23 @@ static int flash_andes_qspi_read(const struct device *dev,
 
 	acquire_device(dev);
 
-	ret = flash_andes_qspi_cmd_addr_read(dev,
-		FLASH_ANDES_CMD_4READ, addr, dest, size);
+	do {
+		/* Get the adequate size to receive */
+		to_read = MIN(MAX_TRANSFER_CNT, size);
+
+		ret = flash_andes_qspi_cmd_addr_read(dev,
+			FLASH_ANDES_CMD_4READ, addr, dest, to_read);
+
+		if (ret != 0) {
+			break;
+		}
+
+		size -= to_read;
+		dest = (uint8_t *)dest + to_read;
+		addr += to_read;
+
+		flash_andes_qspi_wait_until_ready(dev);
+	} while (size > 0);
 
 	release_device(dev);
 	return ret;
@@ -353,6 +373,8 @@ static int flash_andes_qspi_write(const struct device *dev, off_t addr,
 		/* Get the adequate size to send*/
 		to_write = MIN(page_size - (addr % page_size), size);
 
+		flash_andes_qspi_cmd_write(dev, FLASH_ANDES_CMD_WREN);
+
 		ret = flash_andes_qspi_cmd_addr_write(dev,
 			FLASH_ANDES_CMD_4PP, addr, src, to_write);
 
@@ -880,7 +902,7 @@ flash_andes_qspi_get_parameters(const struct device *dev)
 	return &config->parameters;
 }
 
-static DEVICE_API(flash, flash_andes_qspi_api) = {
+static const struct flash_driver_api flash_andes_qspi_api = {
 	.read = flash_andes_qspi_read,
 	.write = flash_andes_qspi_write,
 	.erase = flash_andes_qspi_erase,