ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/marvell/uboot/drivers/serial/sandbox.c b/marvell/uboot/drivers/serial/sandbox.c
new file mode 100644
index 0000000..ffff5e1
--- /dev/null
+++ b/marvell/uboot/drivers/serial/sandbox.c
@@ -0,0 +1,103 @@
+/*
+ * Copyright (c) 2011 The Chromium OS Authors.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+/*
+ * This provide a test serial port. It provides an emulated serial port where
+ * a test program and read out the serial output and inject serial input for
+ * U-Boot.
+ */
+
+#include <common.h>
+#include <os.h>
+#include <serial.h>
+#include <linux/compiler.h>
+
+/*
+ *
+ * serial_buf: A buffer that holds keyboard characters for the
+ * Sandbox U-boot.
+ *
+ * invariants:
+ * serial_buf_write == serial_buf_read -> empty buffer
+ * (serial_buf_write + 1) % 16 == serial_buf_read -> full buffer
+ */
+static char serial_buf[16];
+static unsigned int serial_buf_write;
+static unsigned int serial_buf_read;
+
+static int sandbox_serial_init(void)
+{
+ os_tty_raw(0);
+ return 0;
+}
+
+static void sandbox_serial_setbrg(void)
+{
+}
+
+static void sandbox_serial_putc(const char ch)
+{
+ os_write(1, &ch, 1);
+}
+
+static void sandbox_serial_puts(const char *str)
+{
+ os_write(1, str, strlen(str));
+}
+
+static unsigned int increment_buffer_index(unsigned int index)
+{
+ return (index + 1) % ARRAY_SIZE(serial_buf);
+}
+
+static int sandbox_serial_tstc(void)
+{
+ const unsigned int next_index =
+ increment_buffer_index(serial_buf_write);
+ ssize_t count;
+
+ os_usleep(100);
+ if (next_index == serial_buf_read)
+ return 1; /* buffer full */
+
+ count = os_read_no_block(0, &serial_buf[serial_buf_write], 1);
+ if (count == 1)
+ serial_buf_write = next_index;
+ return serial_buf_write != serial_buf_read;
+}
+
+static int sandbox_serial_getc(void)
+{
+ int result;
+
+ while (!sandbox_serial_tstc())
+ ; /* buffer empty */
+
+ result = serial_buf[serial_buf_read];
+ serial_buf_read = increment_buffer_index(serial_buf_read);
+ return result;
+}
+
+static struct serial_device sandbox_serial_drv = {
+ .name = "sandbox_serial",
+ .start = sandbox_serial_init,
+ .stop = NULL,
+ .setbrg = sandbox_serial_setbrg,
+ .putc = sandbox_serial_putc,
+ .puts = sandbox_serial_puts,
+ .getc = sandbox_serial_getc,
+ .tstc = sandbox_serial_tstc,
+};
+
+void sandbox_serial_initialize(void)
+{
+ serial_register(&sandbox_serial_drv);
+}
+
+__weak struct serial_device *default_serial_console(void)
+{
+ return &sandbox_serial_drv;
+}