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>

diff --git a/arch/mips/include/asm/mach-loongson/loongson.h b/arch/mips/include/asm/mach-loongson/loongson.h
index efb234437791bbf8fef4623671d3ab6e34766a95..722db9e811e5b568c4a9fc5008908732f7bb5462 100644 (file)
--- a/arch/mips/include/asm/mach-loongson/loongson.h
+++ b/arch/mips/include/asm/mach-loongson/loongson.h
@@ -31,6 +31,9 @@ extern void __init prom_init_memory(void);
 extern void __init prom_init_cmdline(void);
 extern void __init prom_init_machtype(void);
 extern void __init prom_init_env(void);
+extern unsigned long _loongson_uart_base;
+extern unsigned long uart8250_base[];
+extern void prom_init_uart_base(void);
 
 /* irq operation functions */
 extern void bonito_irqdispatch(void);

diff --git a/arch/mips/include/asm/mach-loongson/machine.h b/arch/mips/include/asm/mach-loongson/machine.h
index ea5954c4b221f2befbf9026168646e17579a8e14..d2f586157630ec414411568c9f7d8ad9709ded5e 100644 (file)
--- a/arch/mips/include/asm/mach-loongson/machine.h
+++ b/arch/mips/include/asm/mach-loongson/machine.h
@@ -13,8 +13,6 @@
 
 #ifdef CONFIG_LEMOTE_FULOONG2E
 
-#define LOONGSON_UART_BASE (LOONGSON_PCIIO_BASE + 0x3f8)
-
 #define LOONGSON_MACHTYPE MACH_LEMOTE_FL2E
 
 #endif

diff --git a/arch/mips/loongson/common/Makefile b/arch/mips/loongson/common/Makefile
index d21d1163fad02812867983cdcc8cee85c0de4de7..be6adf7eb82502a5f871fc3ebabdb72f94b8440d 100644 (file)
--- 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 8ec4fb2066ae48aeda90c33797cfc6dd32a3c9ae..23e7a8f8897f6626b77d1511df9fcf6176b8e5e0 100644 (file)
--- 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 b7e4913627abf60d1e70e421884dea4f47eaf9f8..3b1dbc1ca242e8004924c8a2c3c3cfb7e0de7b5a 100644 (file)
--- 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 6d341e426f64f4e56295a3fd0e80e31d94dd3e24..dc6488c1476320a8e501c0105a47b5259597756d 100644 (file)
--- 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 (file)
index 0000000..233c708
--- /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);
+}