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authorMarc St-Jean <stjeanma@pmc-sierra.com>2007-05-06 14:48:45 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-07 12:12:50 -0700
commitbeab697ab4b2962e3d741b476abe443baad0933d (patch)
treef581ce38378f6cacbf0042b4eb9c084a6fc932d9 /include/linux/serial_reg.h
parent6179b5562d5d17c7c09b54cb11dd925ca308d7a9 (diff)
serial driver PMC MSP71xx
Serial driver patch for the PMC-Sierra MSP71xx devices. There are three different fixes: 1 Fix for DesignWare APB THRE errata: In brief, this is a non-standard 16550 in that the THRE interrupt will not re-assert itself simply by disabling and re-enabling the THRI bit in the IER, it is only re-enabled if a character is actually sent out. It appears that the "8250-uart-backup-timer.patch" in the "mm" tree also fixes it so we have dropped our initial workaround. This patch now needs to be applied on top of that "mm" patch. 2 Fix for Busy Detect on LCR write: The DesignWare APB UART has a feature which causes a new Busy Detect interrupt to be generated if it's busy when the LCR is written. This fix saves the value of the LCR and rewrites it after clearing the interrupt. 3 Workaround for interrupt/data concurrency issue: The SoC needs to ensure that writes that can cause interrupts to be cleared reach the UART before returning from the ISR. This fix reads a non-destructive register on the UART so the read transaction completion ensures the previously queued write transaction has also completed. Signed-off-by: Marc St-Jean <Marc_St-Jean@pmc-sierra.com> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/serial_reg.h')
-rw-r--r--include/linux/serial_reg.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/serial_reg.h b/include/linux/serial_reg.h
index 3c8a6aa7741..1c5ed7d92b0 100644
--- a/include/linux/serial_reg.h
+++ b/include/linux/serial_reg.h
@@ -38,6 +38,8 @@
#define UART_IIR_RDI 0x04 /* Receiver data interrupt */
#define UART_IIR_RLSI 0x06 /* Receiver line status interrupt */
+#define UART_IIR_BUSY 0x07 /* DesignWare APB Busy Detect */
+
#define UART_FCR 2 /* Out: FIFO Control Register */
#define UART_FCR_ENABLE_FIFO 0x01 /* Enable the FIFO */
#define UART_FCR_CLEAR_RCVR 0x02 /* Clear the RCVR FIFO */