serial: bfin: Flip the jtag serial console to CONFIG_SERIAL_MULTI

Rework the emulation of serial console via JTAG from simple ad-hoc
implementation of serial port routines to CONFIG_SERIAL_MULTI and
enable CONFIG_SERIAL_MULTI unconditionally for blackfin.

In order for the JTAG serial console to take precedence over all
other serial ports available in system, implement override for
default_serial_console call returning this JTAG serial console.

This brings in a bit of a growth of size, but eventually will allow
us to unconditionally enable CONFIG_SERIAL_MULTI throughout the whole
U-Boot and maintain only one serial subsystem.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Marek Vasut <marek.vasut@gmail.com>
Cc: Tom Rini <trini@ti.com>
Cc: Mike Frysinger <vapier@gentoo.org>

1 files changed, 30 insertions, 7 deletions

diff --git a/arch/blackfin/cpu/jtag-console.c b/arch/blackfin/cpu/jtag-console.c
index a77358a..7cddb85 100644
--- a/arch/blackfin/cpu/jtag-console.c
+++ b/arch/blackfin/cpu/jtag-console.c
@@ -194,12 +194,35 @@ int drv_jtag_console_init(void)
 }
 
 #ifdef CONFIG_UART_CONSOLE_IS_JTAG
+#include <serial.h>
 /* Since the JTAG is always available (at power on), allow it to fake a UART */
-void serial_set_baud(uint32_t baud) {}
-void serial_setbrg(void)            {}
-int serial_init(void)               { return 0; }
-void serial_putc(const char c)      __attribute__((alias("jtag_putc")));
-void serial_puts(const char *s)     __attribute__((alias("jtag_puts")));
-int serial_tstc(void)               __attribute__((alias("jtag_tstc")));
-int serial_getc(void)               __attribute__((alias("jtag_getc")));
+void jtag_serial_setbrg(void)
+{
+}
+
+int jtag_serial_init(void)
+{
+	return 0;
+}
+
+static struct serial_device serial_jtag_drv = {
+	.name	= "jtag",
+	.start	= jtag_serial_init,
+	.stop	= NULL,
+	.setbrg	= jtag_serial_setbrg,
+	.putc	= jtag_putc,
+	.puts	= jtag_puts,
+	.tstc	= jtag_tstc,
+	.getc	= jtag_getc,
+};
+
+void bfin_jtag_initialize(void)
+{
+	serial_register(&serial_jtag_drv);
+}
+
+struct serial_device *default_serial_console(void)
+{
+	return &serial_jtag_drv;
+}
 #endif