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ARM: PL011: add DMA burst threshold support for ST variants

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ST Micro variants has some specific dma burst threshold compensation,
which allows them to make better use of a DMA controller.  Add support
to set this up.

Based on a patch from Linus Walleij.

Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2010-12-22 17:59:16 +00:00
parent 68b65f7305
commit 38d624361b
2 changed files with 27 additions and 0 deletions
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15
include/linux/amba/serial.h
View file

@ -113,6 +113,21 @@
#define UART01x_LCRH_PEN 0x02
#define UART01x_LCRH_BRK 0x01
#define ST_UART011_DMAWM_RX_1 (0 << 3)
#define ST_UART011_DMAWM_RX_2 (1 << 3)
#define ST_UART011_DMAWM_RX_4 (2 << 3)
#define ST_UART011_DMAWM_RX_8 (3 << 3)
#define ST_UART011_DMAWM_RX_16 (4 << 3)
#define ST_UART011_DMAWM_RX_32 (5 << 3)
#define ST_UART011_DMAWM_RX_48 (6 << 3)
#define ST_UART011_DMAWM_TX_1 0
#define ST_UART011_DMAWM_TX_2 1
#define ST_UART011_DMAWM_TX_4 2
#define ST_UART011_DMAWM_TX_8 3
#define ST_UART011_DMAWM_TX_16 4
#define ST_UART011_DMAWM_TX_32 5
#define ST_UART011_DMAWM_TX_48 6
#define UART010_IIR_RTIS 0x08
#define UART010_IIR_TIS 0x04
#define UART010_IIR_RIS 0x02