Add PL011 UART driver
A minimal PL011 driver containing necessary functions
to print to UART. Based on the assembly implementation
found in TF-A (hash: 39bcbeac9c8c20ae660cb6d9e825ceb01e6144e7;
file: drivers/arm/pl011/aarch64/pl011_console.S).
Signed-off-by: Gabor Toth <gabor.toth2@arm.com>
Signed-off-by: Gabor Ambrus <gabor.ambrus@arm.com>
Change-Id: I644fb011b2b9a68aa09e8cc3a09ebd8b9576bb30
diff --git a/platform/drivers/arm/uart/uart_adapter.c b/platform/drivers/arm/uart/uart_adapter.c
new file mode 100644
index 0000000..8f43214
--- /dev/null
+++ b/platform/drivers/arm/uart/uart_adapter.c
@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2023, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+#include <assert.h>
+#include <config/interface/config_store.h>
+#include <platform/interface/device_region.h>
+#include <platform/interface/uart.h>
+#include <psa/error.h>
+#include <stdlib.h>
+
+#include "uart_decl.h"
+
+/*
+ * Flush the UART
+ */
+static int uart_flush(platform_uart_context *context)
+{
+ uflush(context->base_address);
+
+ return 0;
+}
+
+/*
+ * Send character to UART
+ */
+static int uart_putc(platform_uart_context *context, uint8_t ch)
+{
+ uputc(ch, context->base_address);
+
+ return 0;
+}
+
+/*
+ * Initialize the driver for the UART
+ */
+int platform_uart_create(struct platform_uart_driver *driver, int instance)
+{
+ static const struct platform_uart_iface iface = { .uart_flush = uart_flush,
+ .uart_putc = uart_putc };
+
+ struct device_region device_region;
+
+ if (!config_store_query(CONFIG_CLASSIFIER_DEVICE_REGION, "uart", instance, &device_region,
+ sizeof(device_region)))
+ return PSA_STATUS_HARDWARE_FAILURE;
+
+ driver->context = malloc(sizeof(platform_uart_context));
+
+ if (driver->context) {
+ /* Set only if context was created */
+ driver->iface = &iface;
+
+ /* A device region has been provided, possibly from an external configuration. */
+ ((platform_uart_context *)driver->context)->base_address = device_region.base_addr;
+
+ return uart_init(device_region.base_addr);
+ }
+
+ return -1;
+}
+
+void platform_uart_destroy(struct platform_uart_driver *driver)
+{
+ if (driver->context) {
+ uart_deinit(((platform_uart_context *) driver->context)->base_address);
+ free(driver->context);
+ driver->context = NULL;
+ }
+
+ driver->iface = NULL;
+}