linux-kernel - [PATCH v4 09/11] serial: 8250

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Message-Id: <1452627672-9482-10-git-send-email-peter@hurleysoftware.com>
Date:	Tue, 12 Jan 2016 11:41:10 -0800
From:	Peter Hurley <peter@...leysoftware.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:	Rob Herring <robh+dt@...nel.org>,
	Grant Likely <grant.likely@...aro.org>,
	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
	Kevin Cernekee <cernekee@...il.com>,
	Jon Hunter <jonathanh@...dia.com>,
	Sebastian Frias <sf84@...oste.net>,
	Paul Burton <paul.burton@...tec.com>,
	Peter Hurley <peter@...leysoftware.com>
Subject: [PATCH v4 09/11] serial: 8250_early: Use port->regshift

earlycon initializes struct uart_port::regshift to the correct
value for UPIO_MEM32 already. Use the port field rather than
hard-coded value.

This enables broader support for various i/o access methods in
8250 earlycon (eg., omap8250 earlycon).

Signed-off-by: Peter Hurley <peter@...leysoftware.com>
---
 drivers/tty/serial/8250/8250_early.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_early.c b/drivers/tty/serial/8250/8250_early.c
index 307fb23..e7cdc0c 100644
--- a/drivers/tty/serial/8250/8250_early.c
+++ b/drivers/tty/serial/8250/8250_early.c
@@ -39,15 +39,17 @@
 
 static unsigned int __init serial8250_early_in(struct uart_port *port, int offset)
 {
+	offset <<= port->regshift;
+
 	switch (port->iotype) {
 	case UPIO_MEM:
 		return readb(port->membase + offset);
 	case UPIO_MEM16:
-		return readw(port->membase + (offset << 1));
+		return readw(port->membase + offset);
 	case UPIO_MEM32:
-		return readl(port->membase + (offset << 2));
+		return readl(port->membase + offset);
 	case UPIO_MEM32BE:
-		return ioread32be(port->membase + (offset << 2));
+		return ioread32be(port->membase + offset);
 	case UPIO_PORT:
 		return inb(port->iobase + offset);
 	default:
@@ -57,18 +59,20 @@ static unsigned int __init serial8250_early_in(struct uart_port *port, int offse
 
 static void __init serial8250_early_out(struct uart_port *port, int offset, int value)
 {
+	offset <<= port->regshift;
+
 	switch (port->iotype) {
 	case UPIO_MEM:
 		writeb(value, port->membase + offset);
 		break;
 	case UPIO_MEM16:
-		writew(value, port->membase + (offset << 1));
+		writew(value, port->membase + offset);
 		break;
 	case UPIO_MEM32:
-		writel(value, port->membase + (offset << 2));
+		writel(value, port->membase + offset);
 		break;
 	case UPIO_MEM32BE:
-		iowrite32be(value, port->membase + (offset << 2));
+		iowrite32be(value, port->membase + offset);
 		break;
 	case UPIO_PORT:
 		outb(value, port->iobase + offset);
-- 
2.7.0