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authorHartley Sweeten <hartleys@visionengravers.com>2008-10-02 17:13:02 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2008-10-03 11:03:39 +0100
commit92e88aa7fb8190031dca9e04acbf4821bd77941b (patch)
tree019a5626b59a2e1715aa2b112663fb79c9f2a9bc
parent7a1f3701183e2efb45e480517e29f6880e105f7b (diff)
[ARM] 5276/1: ep93xx: allow selecting UART for early kernel messages
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>
-rw-r--r--arch/arm/mach-ep93xx/Kconfig14
-rw-r--r--arch/arm/mach-ep93xx/include/mach/uncompress.h21
2 files changed, 29 insertions, 6 deletions
diff --git a/arch/arm/mach-ep93xx/Kconfig b/arch/arm/mach-ep93xx/Kconfig
index ea8549bfbef..5a1b8c05c95 100644
--- a/arch/arm/mach-ep93xx/Kconfig
+++ b/arch/arm/mach-ep93xx/Kconfig
@@ -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
diff --git a/arch/arm/mach-ep93xx/include/mach/uncompress.h b/arch/arm/mach-ep93xx/include/mach/uncompress.h
index 1fd2f17de32..16026c2b1c8 100644
--- a/arch/arm/mach-ep93xx/include/mach/uncompress.h
+++ b/arch/arm/mach-ep93xx/include/mach/uncompress.h
@@ -31,10 +31,19 @@ static void __raw_writel(unsigned int value, unsigned int ptr)
*((volatile unsigned int *)ptr) = value;
}
-
-#define PHYS_UART1_DATA 0x808c0000
-#define PHYS_UART1_FLAG 0x808c0018
-#define UART1_FLAG_TXFF 0x20
+#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_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)