1 files changed, 75 insertions, 0 deletions
diff --git a/core/drivers/stih_asc.c b/core/drivers/stih_asc.c
new file mode 100644
index 0000000..7f69ce7
--- /dev/null
+++ b/core/drivers/stih_asc.c
@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) 2017, Linaro Limited
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+#include <drivers/stih_asc.h>
+#include <io.h>
+#include <keep.h>
+#include <util.h>
+
+#define ASC_BAUDRATE		0x00
+#define ASC_TXBUFFER		0x04
+#define ASC_STATUS		0x14
+
+#define ASC_STATUS_TX_EMPTY		BIT(1)
+#define ASC_STATUS_TX_HALF_EMPTY	BIT(2)
+
+static vaddr_t chip_to_base(struct serial_chip *chip)
+{
+	struct stih_asc_pd *pd =
+		container_of(chip, struct stih_asc_pd, chip);
+
+	return io_pa_or_va(&pd->base);
+}
+
+static void stih_asc_flush(struct serial_chip *chip)
+{
+	vaddr_t base = chip_to_base(chip);
+
+	while (!(read32(base + ASC_STATUS) & ASC_STATUS_TX_EMPTY))
+		;
+}
+
+static void stih_asc_putc(struct serial_chip *chip, int ch)
+{
+	vaddr_t base = chip_to_base(chip);
+
+	while (!(read32(base + ASC_STATUS) & ASC_STATUS_TX_HALF_EMPTY))
+		;
+
+	write32(ch, base + ASC_TXBUFFER);
+}
+
+static const struct serial_ops stih_asc_ops = {
+	.flush = stih_asc_flush,
+	.putc = stih_asc_putc,
+};
+KEEP_PAGER(stih_asc_ops);
+
+void stih_asc_init(struct stih_asc_pd *pd, vaddr_t base)
+{
+	pd->base.pa = base;
+	pd->chip.ops = &stih_asc_ops;
+}