[PATCH v2 15/15] serial: uniformize serial port I/O infos display

[Hugo Villeneuve <hugo@hugovil.com>]

From: Hugo Villeneuve <hvilleneuve@dimonoff.com>

Uniformize serial port I/O infos display from three different functions
that display mostly the same information, but with some variations, by
adding a common function.

Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>
---
Maybe the width information could be dropped entirely?
---
 drivers/tty/serial/earlycon.c    | 13 +++-------
 drivers/tty/serial/serial_core.c | 52 +++++++++++++++++++++++++++-------------
 include/linux/serial_core.h      |  1 +
 3 files changed, 40 insertions(+), 26 deletions(-)

diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c
index e799feaa14bf1ac7c1a5677cd84490e7c486449b..ce740cdc7cebffca0b4f6be98b8bca66540af72d 100644
--- a/drivers/tty/serial/earlycon.c
+++ b/drivers/tty/serial/earlycon.c
@@ -75,19 +75,12 @@ static void __init earlycon_print_info(struct earlycon_device *device)
 {
 	struct console *earlycon = device->con;
 	struct uart_port *port = &device->port;
-	char address[64] = "";
+	char ioinfos[64];
 
-	if (uart_iotype_mmio(port->iotype))
-		scnprintf(address, sizeof(address), " at MMIO%s %pa",
-			  (port->iotype == UPIO_MEM) ? "" :
-			  (port->iotype == UPIO_MEM16) ? "16" :
-			  (port->iotype == UPIO_MEM32) ? "32" : "32be",
-			  &port->mapbase);
-	else if (uart_iotype_legacy_io(port->iotype))
-		scnprintf(address, sizeof(address), " at I/O port 0x%lx", port->iobase);
+	uart_get_ioinfos(port, ioinfos, sizeof(ioinfos));
 
 	pr_info("%s%d%s (options '%s')\n", earlycon->name, earlycon->index,
-		address, device->options);
+		ioinfos, device->options);
 }
 
 static int __init parse_options(struct earlycon_device *device, char *options)
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 0e015477848504e37afb34c8088957083f1662c7..b9a9225d99b616a7f691a8f990fd77ab02609012 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -2002,6 +2002,7 @@ static void uart_line_info(struct seq_file *m, struct uart_state *state)
 	struct tty_port *port = &state->port;
 	enum uart_pm_state pm_state;
 	struct uart_port *uport;
+	char ioinfos[64];
 	char stat_buf[32];
 	unsigned int status;
 
@@ -2013,10 +2014,8 @@ static void uart_line_info(struct seq_file *m, struct uart_state *state)
 
 	seq_printf(m, "%u: uart:%s", uport->line, uart_type(uport));
 
-	if (uart_iotype_mmio(uport->iotype))
-		seq_printf(m, " mmio:%pa", &uport->mapbase);
-	else if (uart_iotype_legacy_io(uport->iotype))
-		seq_printf(m, " port:%08lX", uport->iobase);
+	uart_get_ioinfos(uport, ioinfos, sizeof(ioinfos));
+	seq_printf(m, "%s", ioinfos);
 
 	seq_printf(m, " irq:%u", uport->irq);
 
@@ -2480,26 +2479,47 @@ int uart_resume_port(struct uart_driver *drv, struct uart_port *uport)
 }
 EXPORT_SYMBOL(uart_resume_port);
 
+static const char *uart_get_mmio_width(struct uart_port *port)
+{
+	switch (port->iotype) {
+	case UPIO_MEM16:
+		return "16";
+	case UPIO_MEM32:
+	case UPIO_MEM32BE:
+		return "32be";
+	case UPIO_AU:
+	case UPIO_MEM:
+	default:
+		return "";
+	}
+}
+
+void uart_get_ioinfos(struct uart_port *port, char *buf, size_t size)
+{
+	buf[0] = '\0';
+
+	if (uart_iotype_mmio(port->iotype)) {
+		scnprintf(buf, size, " MMIO%s:%pa", uart_get_mmio_width(port), &port->mapbase);
+	} else if (uart_iotype_legacy_io(port->iotype)) {
+		if (port->iotype == UPIO_PORT)
+			scnprintf(buf, size, " I/O:0x%lx", port->iobase);
+		else if (port->iotype == UPIO_HUB6)
+			scnprintf(buf, size, " I/O:0x%lx, offset 0x%x", port->iobase, port->hub6);
+	}
+}
+EXPORT_SYMBOL(uart_get_ioinfos);
+
 static inline void
 uart_report_port(struct uart_driver *drv, struct uart_port *port)
 {
-	char address[64] = "";
+	char ioinfos[64];
 
-	if (uart_iotype_mmio(port->iotype))
-		scnprintf(address, sizeof(address), " at MMIO %pa", &port->mapbase);
-	else if (uart_iotype_legacy_io(port->iotype)) {
-		if (port->iotype == UPIO_PORT)
-			scnprintf(address, sizeof(address), " at I/O 0x%lx", port->iobase);
-		else if (port->iotype == UPIO_HUB6)
-			scnprintf(address, sizeof(address), " at I/O 0x%lx offset 0x%x",
-				  port->iobase, port->hub6);
-	}
+	uart_get_ioinfos(port, ioinfos, sizeof(ioinfos));
 
 	pr_info("%s%s%s%s (irq = %u, base_baud = %u) is a %s\n",
 		port->dev ? dev_name(port->dev) : "",
 		port->dev ? ": " : "",
-		port->name,
-		address, port->irq, port->uartclk / 16, uart_type(port));
+		port->name, ioinfos, port->irq, port->uartclk / 16, uart_type(port));
 
 	/* The magic multiplier feature is a bit obscure, so report it too.  */
 	if (port->flags & UPF_MAGIC_MULTIPLIER)
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 626dd939c53c9f920d71aadd360ec0ea0bacce0d..1289e812b40f3d7b7a02ff1a87eaf649e71e0d2f 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -1308,6 +1308,7 @@ static inline int uart_handle_break(struct uart_port *port)
 
 int uart_get_rs485_mode(struct uart_port *port);
 
+void uart_get_ioinfos(struct uart_port *port, char *buf, size_t size);
 bool uart_iotype_mmio(enum uart_iotype iotype);
 bool uart_iotype_legacy_io(enum uart_iotype iotype);
 

-- 
2.47.3