| 1 | From 91f8d0c8fbb9ea70bf78a291e312157177be8ee3 Mon Sep 17 00:00:00 2001 |
| 2 | From: John Crispin <blogic@openwrt.org> |
| 3 | Date: Sat, 20 Aug 2011 18:55:13 +0200 |
| 4 | Subject: [PATCH 01/24] MIPS: lantiq: fix early printk |
| 5 | |
| 6 | The code was using a 32bit write operation in the early_printk code. This |
| 7 | resulted in 3 zero bytes also being written to the serial port. Change the |
| 8 | memory access to 8bit. |
| 9 | |
| 10 | Signed-off-by: Thomas Langer <thomas.langer@lantiq.com> |
| 11 | Signed-off-by: John Crispin <blogic@openwrt.org> |
| 12 | Cc: linux-mips@linux-mips.org |
| 13 | --- |
| 14 | .../mips/include/asm/mach-lantiq/xway/lantiq_soc.h | 4 ++++ |
| 15 | arch/mips/lantiq/early_printk.c | 14 ++++++++------ |
| 16 | 2 files changed, 12 insertions(+), 6 deletions(-) |
| 17 | |
| 18 | --- a/arch/mips/include/asm/mach-lantiq/xway/lantiq_soc.h |
| 19 | +++ b/arch/mips/include/asm/mach-lantiq/xway/lantiq_soc.h |
| 20 | @@ -34,6 +34,10 @@ |
| 21 | #define LTQ_ASC1_BASE_ADDR 0x1E100C00 |
| 22 | #define LTQ_ASC_SIZE 0x400 |
| 23 | |
| 24 | +/* during early_printk no ioremap is possible |
| 25 | + lets use KSEG1 instead */ |
| 26 | +#define LTQ_EARLY_ASC KSEG1ADDR(LTQ_ASC1_BASE_ADDR) |
| 27 | + |
| 28 | /* RCU - reset control unit */ |
| 29 | #define LTQ_RCU_BASE_ADDR 0x1F203000 |
| 30 | #define LTQ_RCU_SIZE 0x1000 |
| 31 | --- a/arch/mips/lantiq/early_printk.c |
| 32 | +++ b/arch/mips/lantiq/early_printk.c |
| 33 | @@ -12,11 +12,13 @@ |
| 34 | #include <lantiq.h> |
| 35 | #include <lantiq_soc.h> |
| 36 | |
| 37 | -/* no ioremap possible at this early stage, lets use KSEG1 instead */ |
| 38 | -#define LTQ_ASC_BASE KSEG1ADDR(LTQ_ASC1_BASE_ADDR) |
| 39 | #define ASC_BUF 1024 |
| 40 | -#define LTQ_ASC_FSTAT ((u32 *)(LTQ_ASC_BASE + 0x0048)) |
| 41 | -#define LTQ_ASC_TBUF ((u32 *)(LTQ_ASC_BASE + 0x0020)) |
| 42 | +#define LTQ_ASC_FSTAT ((u32 *)(LTQ_EARLY_ASC + 0x0048)) |
| 43 | +#ifdef __BIG_ENDIAN |
| 44 | +#define LTQ_ASC_TBUF ((u32 *)(LTQ_EARLY_ASC + 0x0020 + 3)) |
| 45 | +#else |
| 46 | +#define LTQ_ASC_TBUF ((u32 *)(LTQ_EARLY_ASC + 0x0020)) |
| 47 | +#endif |
| 48 | #define TXMASK 0x3F00 |
| 49 | #define TXOFFSET 8 |
| 50 | |
| 51 | @@ -27,7 +29,7 @@ void prom_putchar(char c) |
| 52 | local_irq_save(flags); |
| 53 | do { } while ((ltq_r32(LTQ_ASC_FSTAT) & TXMASK) >> TXOFFSET); |
| 54 | if (c == '\n') |
| 55 | - ltq_w32('\r', LTQ_ASC_TBUF); |
| 56 | - ltq_w32(c, LTQ_ASC_TBUF); |
| 57 | + ltq_w8('\r', LTQ_ASC_TBUF); |
| 58 | + ltq_w8(c, LTQ_ASC_TBUF); |
| 59 | local_irq_restore(flags); |
| 60 | } |
| 61 | |
