ARM: 6158/2: PL011 baudrate extension for ST-Ericssons derivative

Implementation of the ST-Ericsson baudrate extension in the PL011
block. In this modified variant it is possible to change the
sampling factor from 16 to 8, and thanks to this we can get higher
baudrates while still using the same peripheral clock.

Also replace the simple division to determine the baud divisor
with DIV_ROUND_CLOSEST() rather than a simple integer division.

Cc: Alessandro Rubini <rubini@unipv.it>
Cc: Jerzy Kasenberg <jerzy.kasenberg@tieto.com>
Signed-off-by: Marcin Mielczarczyk <marcin.mielczarczyk@tieto.com>
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/amba/serial.h b/include/linux/amba/serial.h
index 93c96a66c518..e1b634b635f2 100644
--- a/include/linux/amba/serial.h
+++ b/include/linux/amba/serial.h
@@ -86,6 +86,7 @@
 #define UART010_CR_TIE          0x0020
 #define UART010_CR_RIE          0x0010
 #define UART010_CR_MSIE         0x0008
+#define ST_UART011_CR_OVSFACT   0x0008  /* Oversampling factor */
 #define UART01x_CR_IIRLP        0x0004  /* SIR low power mode */
 #define UART01x_CR_SIREN        0x0002  /* SIR enable */
 #define UART01x_CR_UARTEN       0x0001  /* UART enable */