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>

src/console/Kconfig

@@ -367,6 +367,14 @@ config CONSOLE_SYSTEM76_EC
 	help
 	  Send coreboot debug output to a System76 embedded controller.
 
+config CONSOLE_AMD_SIMNOW
+	bool "AMD SimNow console output"
+	default n
+	depends on SOC_AMD_COMMON && !POST_IO
+	select CONSOLE_POST
+	help
+	  Send coreboot debug output to IO ports for SimNow
+
 config CONSOLE_OVERRIDE_LOGLEVEL
 	bool
 	help

src/console/console.c

@@ -5,6 +5,7 @@
 #include <console/i2c_smbus.h>
 #include <console/ne2k.h>
 #include <console/qemu_debugcon.h>
+#include <console/simnow.h>
 #include <console/spi.h>
 #include <console/spkmodem.h>
 #include <console/streams.h>
@@ -28,6 +29,7 @@ void console_hw_init(void)
 	__flashconsole_init();
 	__system76_ec_init();
 	__i2c_smbus_console_init();
+	__simnow_console_init();
 }
 
 void console_interactive_tx_byte(unsigned char byte, void *data_unused)
@@ -47,6 +49,7 @@ void console_interactive_tx_byte(unsigned char byte, void *data_unused)
 	__spiconsole_tx_byte(byte);
 	__system76_ec_tx_byte(byte);
 	__i2c_smbus_console_tx_byte(byte);
+	__simnow_console_tx_byte(byte);
 }
 
 void console_stored_tx_byte(unsigned char byte, void *data_unused)

src/include/console/console.h

@@ -72,7 +72,7 @@ enum { CONSOLE_LOG_NONE = 0, CONSOLE_LOG_FAST, CONSOLE_LOG_ALL };
 #define HAS_ONLY_FAST_CONSOLES !(CONFIG(SPKMODEM) || CONFIG(CONSOLE_QEMU_DEBUGCON) || \
 	CONFIG(CONSOLE_SERIAL) || CONFIG(CONSOLE_NE2K) || CONFIG(CONSOLE_USB) || \
 	CONFIG(EM100PRO_SPI_CONSOLE) || CONFIG(CONSOLE_SPI_FLASH) || \
-	CONFIG(CONSOLE_SYSTEM76_EC))
+	CONFIG(CONSOLE_SYSTEM76_EC) || CONFIG(CONSOLE_AMD_SIMNOW))
 
 #else
 static inline int get_log_level(void) { return -1; }

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 */

src/soc/amd/common/block/simnow/Makefile.inc

@@ -0,0 +1,7 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
+ifeq ($(CONFIG_CONSOLE_AMD_SIMNOW),y)
+all-y += simnow_console.c
+
+smm-$(CONFIG_DEBUG_SMI) += simnow_console.c
+endif

src/soc/amd/common/block/simnow/simnow_console.c

@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <arch/io.h>
+#include <console/console.h>
+#include <console/simnow.h>
+
+#define AMD_SIMNOW_PORT			0x80
+#define AMD_SIMNOW_PORT_DATA_BEGIN	0x5f535452ul
+#define AMD_SIMNOW_PORT_DATA_END	0x5f454e44ul
+
+void simnow_console_init(void)
+{
+	outl(AMD_SIMNOW_PORT_DATA_BEGIN, AMD_SIMNOW_PORT);
+}
+
+void simnow_console_tx_byte(unsigned char data)
+{
+	outb(data, AMD_SIMNOW_PORT);
+
+	if (data == '\n') {
+		outl(AMD_SIMNOW_PORT_DATA_END, AMD_SIMNOW_PORT);
+		outl(AMD_SIMNOW_PORT_DATA_BEGIN, AMD_SIMNOW_PORT);
+	}
+}