diff options
| author | Manuel Lauss <manuel.lauss@googlemail.com> | 2009-10-15 18:49:27 +0200 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2010-02-27 12:52:55 +0100 |
| commit | 8402a1588a4f63465079e98481dd83d1d9cc9a98 (patch) | |
| tree | 1ace3c45421fe4b8d29762fcc67bd09064197f18 /arch/mips/include | |
| parent | 963accbc82a0912b39de39d59e2fd6741db3aa4b (diff) | |
MIPS: Alchemy: prom_putchar is board dependent
This patch replaces the general alchemy prom_putchar() implementation
in favor of board-specific versions: The UART where the output of
prom_putchar is directed to really depends on the board, the current
implementation hardcodes this on a per-SoC basis which is just wrong.
So a generic uart tx function is provided in the alchemy headers,
and the boards can provide their own prom_putchar with custom
destination uart, and all in-kernel alchemy boards support
early printk.
Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/include')
| -rw-r--r-- | arch/mips/include/asm/mach-au1x00/au1000.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/mips/include/asm/mach-au1x00/au1000.h b/arch/mips/include/asm/mach-au1x00/au1000.h index c2e233997b6..e11756d9aaa 100644 --- a/arch/mips/include/asm/mach-au1x00/au1000.h +++ b/arch/mips/include/asm/mach-au1x00/au1000.h @@ -161,6 +161,25 @@ static inline int alchemy_get_cputype(void) return ALCHEMY_CPU_UNKNOWN; } +static inline void alchemy_uart_putchar(u32 uart_phys, u8 c) +{ + void __iomem *base = (void __iomem *)KSEG1ADDR(uart_phys); + int timeout, i; + + /* check LSR TX_EMPTY bit */ + timeout = 0xffffff; + do { + if (__raw_readl(base + 0x1c) & 0x20) + break; + /* slow down */ + for (i = 10000; i; i--) + asm volatile ("nop"); + } while (--timeout); + + __raw_writel(c, base + 0x04); /* tx */ + wmb(); +} + /* arch/mips/au1000/common/clocks.c */ extern void set_au1x00_speed(unsigned int new_freq); extern unsigned int get_au1x00_speed(void); |