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Date: Fri, 23 Jan 2015 23:51:24 +0600
From: Alexander Kuleshov <kuleshovmail@...il.com>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
x86@...nel.org, linux-kernel@...r.kernel.org,
Alexander Kuleshov <kuleshovmail@...il.com>
Subject: [PATCH 1/2] x86/boot/earlyprintk: use macros which are already defined
Use macros which are already defined at <linux/serial_reg.h> for early
initialization of serial port and work with it.
Signed-off-by: Alexander Kuleshov <kuleshovmail@...il.com>
---
arch/x86/boot/boot.h | 1 +
arch/x86/boot/compressed/misc.c | 9 +++-----
arch/x86/boot/compressed/misc.h | 1 +
arch/x86/boot/early_serial_console.c | 44 ++++++++++++------------------------
arch/x86/boot/tty.c | 10 +++-----
5 files changed, 22 insertions(+), 43 deletions(-)
diff --git a/arch/x86/boot/boot.h b/arch/x86/boot/boot.h
index bd49ec6..f09becb 100644
--- a/arch/x86/boot/boot.h
+++ b/arch/x86/boot/boot.h
@@ -23,6 +23,7 @@
#include <stdarg.h>
#include <linux/types.h>
#include <linux/edd.h>
+#include <linux/serial_reg.h>
#include <asm/boot.h>
#include <asm/setup.h>
#include "bitops.h"
diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c
index dcc1c53..df9bf76 100644
--- a/arch/x86/boot/compressed/misc.c
+++ b/arch/x86/boot/compressed/misc.c
@@ -156,18 +156,15 @@ static void scroll(void)
vidmem[i] = ' ';
}
-#define XMTRDY 0x20
-
-#define TXR 0 /* Transmit register (WRITE) */
-#define LSR 5 /* Line Status */
static void serial_putchar(int ch)
{
unsigned timeout = 0xffff;
- while ((inb(early_serial_base + LSR) & XMTRDY) == 0 && --timeout)
+ while ((inb(early_serial_base + UART_LSR) & UART_LSR_THRE) == 0 &&
+ --timeout)
cpu_relax();
- outb(ch, early_serial_base + TXR);
+ outb(ch, early_serial_base + UART_TX);
}
void __putstr(const char *s)
diff --git a/arch/x86/boot/compressed/misc.h b/arch/x86/boot/compressed/misc.h
index 24e3e56..3f5eaaa 100644
--- a/arch/x86/boot/compressed/misc.h
+++ b/arch/x86/boot/compressed/misc.h
@@ -15,6 +15,7 @@
#include <linux/screen_info.h>
#include <linux/elf.h>
#include <linux/io.h>
+#include <linux/serial_reg.h>
#include <asm/page.h>
#include <asm/boot.h>
#include <asm/bootparam.h>
diff --git a/arch/x86/boot/early_serial_console.c b/arch/x86/boot/early_serial_console.c
index 5df2869..bcac6b9 100644
--- a/arch/x86/boot/early_serial_console.c
+++ b/arch/x86/boot/early_serial_console.c
@@ -2,22 +2,6 @@
#define DEFAULT_SERIAL_PORT 0x3f8 /* ttyS0 */
-#define XMTRDY 0x20
-
-#define DLAB 0x80
-
-#define TXR 0 /* Transmit register (WRITE) */
-#define RXR 0 /* Receive register (READ) */
-#define IER 1 /* Interrupt Enable */
-#define IIR 2 /* Interrupt ID */
-#define FCR 2 /* FIFO control */
-#define LCR 3 /* Line control */
-#define MCR 4 /* Modem control */
-#define LSR 5 /* Line Status */
-#define MSR 6 /* Modem Status */
-#define DLL 0 /* Divisor Latch Low */
-#define DLH 1 /* Divisor latch High */
-
#define DEFAULT_BAUD 9600
static void early_serial_init(int port, int baud)
@@ -25,17 +9,17 @@ static void early_serial_init(int port, int baud)
unsigned char c;
unsigned divisor;
- outb(0x3, port + LCR); /* 8n1 */
- outb(0, port + IER); /* no interrupt */
- outb(0, port + FCR); /* no fifo */
- outb(0x3, port + MCR); /* DTR + RTS */
+ outb(0x3, port + UART_LCR);/* 8n1 */
+ outb(0, port + UART_IER); /* no interrupt */
+ outb(0, port + UART_FCR); /* no fifo */
+ outb(0x3, port + UART_MCR); /* DTR + RTS */
divisor = 115200 / baud;
- c = inb(port + LCR);
- outb(c | DLAB, port + LCR);
- outb(divisor & 0xff, port + DLL);
- outb((divisor >> 8) & 0xff, port + DLH);
- outb(c & ~DLAB, port + LCR);
+ c = inb(port + UART_LCR);
+ outb(c | UART_LCR_DLAB, port + UART_LCR);
+ outb(divisor & 0xff, port + UART_DLL);
+ outb((divisor >> 8) & 0xff, port + UART_DLM);
+ outb(c & ~UART_LCR_DLAB, port + UART_LCR);
early_serial_base = port;
}
@@ -101,11 +85,11 @@ static unsigned int probe_baud(int port)
unsigned char lcr, dll, dlh;
unsigned int quot;
- lcr = inb(port + LCR);
- outb(lcr | DLAB, port + LCR);
- dll = inb(port + DLL);
- dlh = inb(port + DLH);
- outb(lcr, port + LCR);
+ lcr = inb(port + UART_LCR);
+ outb(lcr | UART_LCR_DLAB, port + UART_LCR);
+ dll = inb(port + UART_DLL);
+ dlh = inb(port + UART_DLM);
+ outb(lcr, port + UART_LCR);
quot = (dlh << 8) | dll;
return BASE_BAUD / quot;
diff --git a/arch/x86/boot/tty.c b/arch/x86/boot/tty.c
index def2451..93ce9d6d 100644
--- a/arch/x86/boot/tty.c
+++ b/arch/x86/boot/tty.c
@@ -17,11 +17,6 @@
int early_serial_base;
-#define XMTRDY 0x20
-
-#define TXR 0 /* Transmit register (WRITE) */
-#define LSR 5 /* Line Status */
-
/*
* These functions are in .inittext so they can be used to signal
* error during initialization.
@@ -31,10 +26,11 @@ static void __attribute__((section(".inittext"))) serial_putchar(int ch)
{
unsigned timeout = 0xffff;
- while ((inb(early_serial_base + LSR) & XMTRDY) == 0 && --timeout)
+ while ((inb(early_serial_base + UART_LSR) & UART_LSR_THRE) == 0 &&
+ --timeout)
cpu_relax();
- outb(ch, early_serial_base + TXR);
+ outb(ch, early_serial_base + UART_TX);
}
static void __attribute__((section(".inittext"))) bios_putchar(int ch)
--
2.3.0.rc1.275.g028c360
--
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