diff options
| author | Marc St-Jean <stjeanma@pmc-sierra.com> | 2007-05-06 14:48:45 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-07 12:12:50 -0700 |
| commit | beab697ab4b2962e3d741b476abe443baad0933d (patch) | |
| tree | f581ce38378f6cacbf0042b4eb9c084a6fc932d9 /include/linux/serial_reg.h | |
| parent | 6179b5562d5d17c7c09b54cb11dd925ca308d7a9 (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.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/serial_reg.h b/include/linux/serial_reg.h index 3c8a6aa77415..1c5ed7d92b0f 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 */ |