console: Add SimNow console logging

The AMD SimNow tool supports fast logging through an IO port.  Add a new
console to support SimNow logging through port 80.

TEST=observe significant speed improvements on SimNow console log

Signed-off-by: Fred Reitberger <reitbergerfred@gmail.com>
Change-Id: I42a431f48ea14ba4adacbd4a32e15abe7c5e4951
Reviewed-on: https://review.coreboot.org/c/coreboot/+/72751
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

1 files changed, 28 insertions, 0 deletions

diff --git a/src/include/console/simnow.h b/src/include/console/simnow.h
new file mode 100644
index 0000000000..9a9d6792b8
--- /dev/null
+++ b/src/include/console/simnow.h
@@ -0,0 +1,28 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef CONSOLE_SIMNOW_H
+#define CONSOLE_SIMNOW_H
+
+#include <stdint.h>
+
+void simnow_console_init(void);
+void simnow_console_tx_byte(unsigned char data);
+
+#define __SIMNOW_CONSOLE_ENABLE__	CONFIG(CONSOLE_AMD_SIMNOW)
+
+#if __SIMNOW_CONSOLE_ENABLE__
+static inline void __simnow_console_init(void)
+{
+	simnow_console_init();
+}
+
+static inline void __simnow_console_tx_byte(u8 data)
+{
+	simnow_console_tx_byte(data);
+}
+#else
+static inline void __simnow_console_init(void)	{}
+static inline void __simnow_console_tx_byte(u8 data)	{}
+#endif
+
+#endif /* CONSOLE_SIMNOW_H */