[PATCH 2/2] m68k: sun3: add an early boot console over the PROM

[Daniel Palmer <daniel@0x0f.com>]

Register a CON_BOOT console that writes through the resident PROM's
polled character output (prom_putchar()).

Assisted-by: Claude:claude-fable-5.1
Signed-off-by: Daniel Palmer <daniel@0x0f.com>
---
 arch/m68k/sun3/config.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/arch/m68k/sun3/config.c b/arch/m68k/sun3/config.c
index cb4e19b95a1b..49821c28a641 100644
--- a/arch/m68k/sun3/config.c
+++ b/arch/m68k/sun3/config.c
@@ -145,11 +145,33 @@ static void __init sun3_bootmem_alloc(unsigned long memory_start,
 	m68k_setup_node(0);
 }
 
+/* Early boot console over the resident PROM's polled character output. */
+static void sun3_early_console_write(struct console *con, const char *s,
+				     unsigned int n)
+{
+	while (n-- > 0) {
+		if (*s == '\n')
+			prom_putchar('\r');
+		prom_putchar(*s++);
+	}
+}
+
+static struct console sun3_early_console = {
+	.name  = "sun3prom",
+	.write = sun3_early_console_write,
+	.flags = CON_PRINTBUFFER | CON_BOOT,
+	.index = -1,
+};
 
 void __init config_sun3(void)
 {
 	unsigned long memory_start, memory_end;
 
+	if (!sun3_early_console.data) {
+		sun3_early_console.data = &sun3_early_console;
+		register_console(&sun3_early_console);
+	}
+
 	pr_info("ARCH: SUN3\n");
 	idprom_init();
 
-- 
2.55.0