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author | Paul Burton <paul.burton@imgtec.com> | 2013-12-02 16:48:38 +0000 |
---|---|---|
committer | Ralf Baechle <ralf@linux-mips.org> | 2014-01-23 13:02:35 +0100 |
commit | 23a91de41cd996f927efa2ca0805e882426eefb4 (patch) | |
tree | ab7e97857ab2dd0e894e72a08bc1b3d46130ff92 /arch/mips | |
parent | ae0d7cbc99890b3a417a5705763784b8551a10d6 (diff) | |
download | op-kernel-dev-23a91de41cd996f927efa2ca0805e882426eefb4.zip op-kernel-dev-23a91de41cd996f927efa2ca0805e882426eefb4.tar.gz |
MIPS: Malta: use generic 8250 early console
This patch switches Malta from using the MIPS implementation of early
printk with Malta's prom_putchar to using the generic 8250_early
implementation. This offers a couple of advantages:
- We duplicate less generic code.
- The UART can be initialised rather than being reliant upon
inheriting a valid setup from the bootloader.
The Malta console_config function is extended to initialise the early
console if no earlycon= kernel parameter is provided, inheriting the
modetty0 bootloader environment if present and falling back to a
default 38400n8r setup if not. This matches the behaviour used for the
regular console= parameter.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Reviewed-by: Markos Chandras <markos.chandras@imgtec.com>
Reviewed-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: John Crispin <blogic@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/6183/
Diffstat (limited to 'arch/mips')
-rw-r--r-- | arch/mips/Kconfig | 1 | ||||
-rw-r--r-- | arch/mips/mti-malta/Makefile | 2 | ||||
-rw-r--r-- | arch/mips/mti-malta/malta-console.c | 47 | ||||
-rw-r--r-- | arch/mips/mti-malta/malta-init.c | 58 |
4 files changed, 33 insertions, 75 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 57a8873..517748e 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -320,7 +320,6 @@ config MIPS_MALTA select SYS_HAS_CPU_MIPS64_R2 select SYS_HAS_CPU_NEVADA select SYS_HAS_CPU_RM7000 - select SYS_HAS_EARLY_PRINTK select SYS_SUPPORTS_32BIT_KERNEL select SYS_SUPPORTS_64BIT_KERNEL select SYS_SUPPORTS_BIG_ENDIAN diff --git a/arch/mips/mti-malta/Makefile b/arch/mips/mti-malta/Makefile index 72fdedb..eae0ba3 100644 --- a/arch/mips/mti-malta/Makefile +++ b/arch/mips/mti-malta/Makefile @@ -9,7 +9,5 @@ obj-y := malta-amon.o malta-display.o malta-init.o \ malta-int.o malta-memory.o malta-platform.o \ malta-reset.o malta-setup.o malta-time.o -obj-$(CONFIG_EARLY_PRINTK) += malta-console.o - # FIXME FIXME FIXME obj-$(CONFIG_MIPS_MT_SMTC) += malta-smtc.o diff --git a/arch/mips/mti-malta/malta-console.c b/arch/mips/mti-malta/malta-console.c deleted file mode 100644 index 43bcfb4..0000000 --- a/arch/mips/mti-malta/malta-console.c +++ /dev/null @@ -1,47 +0,0 @@ -/* - * Carsten Langgaard, carstenl@mips.com - * Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved. - * - * This program is free software; you can distribute it and/or modify it - * under the terms of the GNU General Public License (Version 2) as - * published by the Free Software Foundation. - * - * This program is distributed in the hope it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License - * for more details. - * - * You should have received a copy of the GNU General Public License along - * with this program; if not, write to the Free Software Foundation, Inc., - * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. - * - * Putting things on the screen/serial line using YAMONs facilities. - */ -#include <linux/console.h> -#include <linux/init.h> -#include <linux/serial_reg.h> -#include <asm/io.h> - - -#define PORT(offset) (0x3f8 + (offset)) - - -static inline unsigned int serial_in(int offset) -{ - return inb(PORT(offset)); -} - -static inline void serial_out(int offset, int value) -{ - outb(value, PORT(offset)); -} - -int prom_putchar(char c) -{ - while ((serial_in(UART_LSR) & UART_LSR_THRE) == 0) - ; - - serial_out(UART_TX, c); - - return 1; -} diff --git a/arch/mips/mti-malta/malta-init.c b/arch/mips/mti-malta/malta-init.c index ff8caff..fcebfce 100644 --- a/arch/mips/mti-malta/malta-init.c +++ b/arch/mips/mti-malta/malta-init.c @@ -14,6 +14,7 @@ #include <linux/init.h> #include <linux/string.h> #include <linux/kernel.h> +#include <linux/serial_8250.h> #include <asm/cacheflush.h> #include <asm/smp-ops.h> @@ -44,32 +45,39 @@ static void __init console_config(void) char parity = '\0', bits = '\0', flow = '\0'; char *s; - if ((strstr(fw_getcmdline(), "console=")) == NULL) { - s = fw_getenv("modetty0"); - if (s) { - while (*s >= '0' && *s <= '9') - baud = baud*10 + *s++ - '0'; - if (*s == ',') - s++; - if (*s) - parity = *s++; - if (*s == ',') - s++; - if (*s) - bits = *s++; - if (*s == ',') - s++; - if (*s == 'h') - flow = 'r'; - } - if (baud == 0) - baud = 38400; - if (parity != 'n' && parity != 'o' && parity != 'e') - parity = 'n'; - if (bits != '7' && bits != '8') - bits = '8'; - if (flow == '\0') + s = fw_getenv("modetty0"); + if (s) { + while (*s >= '0' && *s <= '9') + baud = baud*10 + *s++ - '0'; + if (*s == ',') + s++; + if (*s) + parity = *s++; + if (*s == ',') + s++; + if (*s) + bits = *s++; + if (*s == ',') + s++; + if (*s == 'h') flow = 'r'; + } + if (baud == 0) + baud = 38400; + if (parity != 'n' && parity != 'o' && parity != 'e') + parity = 'n'; + if (bits != '7' && bits != '8') + bits = '8'; + if (flow == '\0') + flow = 'r'; + + if ((strstr(fw_getcmdline(), "earlycon=")) == NULL) { + sprintf(console_string, "uart8250,io,0x3f8,%d%c%c", baud, + parity, bits); + setup_early_serial8250_console(console_string); + } + + if ((strstr(fw_getcmdline(), "console=")) == NULL) { sprintf(console_string, " console=ttyS0,%d%c%c%c", baud, parity, bits, flow); strcat(fw_getcmdline(), console_string); |