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[ARM] 5276/1: ep93xx: allow selecting UART for early kernel messages

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Currently on the EP93xx platform early kernel messages go to UART1.
Since this UART is the only one that has modem control signals it
might be used for another purpose and it is undesirable for those
messages to appear. This patch allows one of the other UARTs to be
selected in the kernel configuration. It is assumed that the
bootloader has configured and initialized the UART since this was the
previous assumption.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Hartley Sweeten 2008-10-02 17:13:02 +01:00 committed by Russell King
parent 7a1f370118
commit 92e88aa7fb
2 changed files with 28 additions and 5 deletions
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14
arch/arm/mach-ep93xx/Kconfig
View File

@ -88,6 +88,20 @@ config MACH_TS72XX
Say 'Y' here if you want your kernel to support the
Technologic Systems TS-72xx board.
choice
prompt "Select a UART for early kernel messages"
config EP93XX_EARLY_UART1
bool "UART1"
config EP93XX_EARLY_UART2
bool "UART2"
config EP93XX_EARLY_UART3
bool "UART3"
endchoice
endmenu
endif

19
arch/arm/mach-ep93xx/include/mach/uncompress.h
View File

@ -31,10 +31,19 @@ static void __raw_writel(unsigned int value, unsigned int ptr)
*((volatile unsigned int *)ptr) = value;
}
#if defined(CONFIG_EP93XX_EARLY_UART1)
#define UART_BASE EP93XX_UART1_PHYS_BASE
#elif defined(CONFIG_EP93XX_EARLY_UART2)
#define UART_BASE EP93XX_UART2_PHYS_BASE
#elif defined(CONFIG_EP93XX_EARLY_UART3)
#define UART_BASE EP93XX_UART3_PHYS_BASE
#else
#define UART_BASE EP93XX_UART1_PHYS_BASE
#endif
#define PHYS_UART1_DATA 0x808c0000
#define PHYS_UART1_FLAG 0x808c0018
#define UART1_FLAG_TXFF 0x20
#define PHYS_UART_DATA (UART_BASE + 0x00)
#define PHYS_UART_FLAG (UART_BASE + 0x18)
#define UART_FLAG_TXFF 0x20
static inline void putc(int c)
{
@ -42,11 +51,11 @@ static inline void putc(int c)
for (i = 0; i < 1000; i++) {
/* Transmit fifo not full? */
if (!(__raw_readb(PHYS_UART1_FLAG) & UART1_FLAG_TXFF))
if (!(__raw_readb(PHYS_UART_FLAG) & UART_FLAG_TXFF))
break;
}
__raw_writeb(c, PHYS_UART1_DATA);
__raw_writeb(c, PHYS_UART_DATA);
}
static inline void flush(void)