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authorWu Zhangjin <wuzhangjin@gmail.com>2009-11-06 13:35:34 +0300
committerRalf Baechle <ralf@linux-mips.org>2009-12-17 04:57:09 +0300
commita3ed495190ebe918f4584291ed8c76f1c97a84fd (patch)
tree700cc7549624c08b38d6003d63a7bb514fe09605 /arch/mips/loongson
parent04cfb90a92a2f9f7b56b2f85c528be7d1561e0e5 (diff)
downloadlinux-a3ed495190ebe918f4584291ed8c76f1c97a84fd.tar.xz
MIPS: Loongson: Cleanup the serial port support
To share the same kernel image amon different machines we have added the machtype command line support. In the old serial port implementation the UART base address is hardcoded as a macro in machine.h which breaks with machtype, so change that to discover the address dynamically. Also move the initialization of the UART base address to uart_base.c to avoid remapping twice for early_printk.c and serial.c. Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com> Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/581/ Patchwork: http://patchwork.linux-mips.org/patch/682/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/loongson')
-rw-r--r--arch/mips/loongson/common/Makefile2
-rw-r--r--arch/mips/loongson/common/early_printk.c11
-rw-r--r--arch/mips/loongson/common/init.c11
-rw-r--r--arch/mips/loongson/common/serial.c17
-rw-r--r--arch/mips/loongson/common/uart_base.c34
5 files changed, 57 insertions, 18 deletions
diff --git a/arch/mips/loongson/common/Makefile b/arch/mips/loongson/common/Makefile
index d21d1163fad0..be6adf7eb825 100644
--- a/arch/mips/loongson/common/Makefile
+++ b/arch/mips/loongson/common/Makefile
@@ -3,7 +3,7 @@
#
obj-y += setup.o init.o cmdline.o env.o time.o reset.o irq.o \
- pci.o bonito-irq.o mem.o machtype.o
+ pci.o bonito-irq.o mem.o machtype.o uart_base.o
#
# Early printk support
diff --git a/arch/mips/loongson/common/early_printk.c b/arch/mips/loongson/common/early_printk.c
index 8ec4fb2066ae..23e7a8f8897f 100644
--- a/arch/mips/loongson/common/early_printk.c
+++ b/arch/mips/loongson/common/early_printk.c
@@ -12,7 +12,6 @@
#include <linux/serial_reg.h>
#include <loongson.h>
-#include <machine.h>
#define PORT(base, offset) (u8 *)(base + offset)
@@ -28,10 +27,14 @@ static inline void serial_out(unsigned char *base, int offset, int value)
void prom_putchar(char c)
{
- unsigned char *uart_base =
- (unsigned char *) ioremap_nocache(LOONGSON_UART_BASE, 8);
+ int timeout;
+ unsigned char *uart_base;
- while ((serial_in(uart_base, UART_LSR) & UART_LSR_THRE) == 0)
+ uart_base = (unsigned char *)_loongson_uart_base;
+ timeout = 1024;
+
+ while (((serial_in(uart_base, UART_LSR) & UART_LSR_THRE) == 0) &&
+ (timeout-- > 0))
;
serial_out(uart_base, UART_TX, c);
diff --git a/arch/mips/loongson/common/init.c b/arch/mips/loongson/common/init.c
index b7e4913627ab..3b1dbc1ca242 100644
--- a/arch/mips/loongson/common/init.c
+++ b/arch/mips/loongson/common/init.c
@@ -1,5 +1,5 @@
/*
- * Copyright (C) 2009 Lemote Inc. & Insititute of Computing Technology
+ * Copyright (C) 2009 Lemote Inc.
* Author: Wu Zhangjin, wuzj@lemote.com
*
* This program is free software; you can redistribute it and/or modify it
@@ -10,19 +10,22 @@
#include <linux/bootmem.h>
-#include <asm/bootinfo.h>
-
#include <loongson.h>
void __init prom_init(void)
{
- /* init base address of io space */
+ /* init base address of io space */
set_io_port_base((unsigned long)
ioremap(LOONGSON_PCIIO_BASE, LOONGSON_PCIIO_SIZE));
prom_init_cmdline();
prom_init_env();
prom_init_memory();
+
+ /*init the uart base address */
+#if defined(CONFIG_EARLY_PRINTK) || defined(CONFIG_SERIAL_8250)
+ prom_init_uart_base();
+#endif
}
void __init prom_free_prom_memory(void)
diff --git a/arch/mips/loongson/common/serial.c b/arch/mips/loongson/common/serial.c
index 6d341e426f64..dc6488c14763 100644
--- a/arch/mips/loongson/common/serial.c
+++ b/arch/mips/loongson/common/serial.c
@@ -23,7 +23,6 @@
{ \
.irq = int, \
.uartclk = 1843200, \
- .iobase = (LOONGSON_UART_BASE - LOONGSON_PCIIO_BASE),\
.iotype = UPIO_PORT, \
.flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST, \
.regshift = 0, \
@@ -52,20 +51,20 @@ static struct plat_serial8250_port uart8250_data[][2] = {
static struct platform_device uart8250_device = {
.name = "serial8250",
.id = PLAT8250_DEV_PLATFORM,
- .dev = {
- .platform_data = uart8250_data[LOONGSON_MACHTYPE],
- },
};
static int __init serial_init(void)
{
- if (uart8250_data[LOONGSON_MACHTYPE][0].iotype == UPIO_MEM)
- uart8250_data[LOONGSON_MACHTYPE][0].membase =
- ioremap_nocache(LOONGSON_UART_BASE, 8);
+ if (uart8250_data[mips_machtype][0].iotype == UPIO_MEM)
+ uart8250_data[mips_machtype][0].membase =
+ (void __iomem *)_loongson_uart_base;
+ else if (uart8250_data[mips_machtype][0].iotype == UPIO_PORT)
+ uart8250_data[mips_machtype][0].iobase =
+ uart8250_base[mips_machtype] - LOONGSON_PCIIO_BASE;
- platform_device_register(&uart8250_device);
+ uart8250_device.dev.platform_data = uart8250_data[mips_machtype];
- return 0;
+ return platform_device_register(&uart8250_device);
}
device_initcall(serial_init);
diff --git a/arch/mips/loongson/common/uart_base.c b/arch/mips/loongson/common/uart_base.c
new file mode 100644
index 000000000000..233c708fc120
--- /dev/null
+++ b/arch/mips/loongson/common/uart_base.c
@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2009 Lemote Inc.
+ * Author: Wu Zhangjin, wuzj@lemote.com
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/module.h>
+#include <asm/bootinfo.h>
+
+#include <loongson.h>
+
+unsigned long __maybe_unused _loongson_uart_base;
+EXPORT_SYMBOL(_loongson_uart_base);
+
+unsigned long __maybe_unused uart8250_base[] = {
+ [MACH_LOONGSON_UNKNOWN] 0,
+ [MACH_LEMOTE_FL2E] (LOONGSON_PCIIO_BASE + 0x3f8),
+ [MACH_LEMOTE_FL2F] (LOONGSON_PCIIO_BASE + 0x2f8),
+ [MACH_LEMOTE_ML2F7] (LOONGSON_LIO1_BASE + 0x3f8),
+ [MACH_LEMOTE_YL2F89] (LOONGSON_LIO1_BASE + 0x3f8),
+ [MACH_DEXXON_GDIUM2F10] (LOONGSON_LIO1_BASE + 0x3f8),
+ [MACH_LOONGSON_END] 0,
+};
+EXPORT_SYMBOL(uart8250_base);
+
+void __maybe_unused prom_init_uart_base(void)
+{
+ _loongson_uart_base =
+ (unsigned long)ioremap_nocache(uart8250_base[mips_machtype], 8);
+}