From 52af6e4b52d0ea1d687121bfba0954c2621d2629 Mon Sep 17 00:00:00 2001
From: Gabriel Somlo <gsomlo@gmail.com>
Date: Tue, 16 Nov 2021 14:17:04 -0500
Subject: lib: utils: Add LiteX UART support
Add support for the UART provided by the LiteX SoC
framework (https://github.com/enjoy-digital/litex),
based on its FDT info (described in the Linux tree at
Documentation/devicetree/bindings/serial/litex,liteuart.yaml).
Signed-off-by: Gabriel Somlo <gsomlo@gmail.com>
Reviewed-by: Xiang W <wxjstz@126.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
---
lib/utils/serial/fdt_serial_litex.c | 39 +++++++++++++++++++++++++++++++++++++
1 file changed, 39 insertions(+)
create mode 100644 lib/utils/serial/fdt_serial_litex.c
(limited to 'lib/utils/serial/fdt_serial_litex.c')
diff --git a/lib/utils/serial/fdt_serial_litex.c b/lib/utils/serial/fdt_serial_litex.c
new file mode 100644
index 0000000..3b3b306
--- /dev/null
+++ b/lib/utils/serial/fdt_serial_litex.c
@@ -0,0 +1,39 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2021 Gabriel Somlo
+ *
+ * Authors:
+ * Gabriel Somlo <gsomlo@gmail.com>
+ */
+
+#include <sbi/sbi_error.h>
+#include <sbi_utils/fdt/fdt_helper.h>
+#include <sbi_utils/serial/fdt_serial.h>
+#include <sbi_utils/serial/litex-uart.h>
+
+static int serial_litex_init(void *fdt, int nodeoff,
+ const struct fdt_match *match)
+{
+ uint64_t reg_addr, reg_size;
+ int rc;
+
+ if (nodeoff < 0 || !fdt)
+ return SBI_ENODEV;
+
+ rc = fdt_get_node_addr_size(fdt, nodeoff, 0, ®_addr, ®_size);
+ if (rc < 0 || !reg_addr || !reg_size)
+ return SBI_ENODEV;
+
+ return litex_uart_init(reg_addr);
+}
+
+static const struct fdt_match serial_litex_match[] = {
+ { .compatible = "litex,liteuart" },
+ { },
+};
+
+struct fdt_serial fdt_serial_litex = {
+ .match_table = serial_litex_match,
+ .init = serial_litex_init
+};
--
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