diff options
| author | Heikki Krogerus <heikki.krogerus@linux.intel.com> | 2013-01-10 11:25:11 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-01-15 23:03:00 -0800 |
| commit | 9ee4b83e51f741a645c43e61b9f3f8075ca0fdf4 (patch) | |
| tree | 93d759187615cb57aa42825a2303dc4f4b0f430c /drivers/tty/serial/8250/8250.h | |
| parent | 6a7320c4669fbf26a8e71a4c8af4101923152375 (diff) | |
serial: 8250: Add support for dmaengine
Add support for dmaengine API. The drivers can implement the
struct uart_8250_dma member in struct uart_8250_port and
8250.c can take care of the rest.
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/8250/8250.h')
| -rw-r--r-- | drivers/tty/serial/8250/8250.h | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/drivers/tty/serial/8250/8250.h b/drivers/tty/serial/8250/8250.h index 3b4ea84898c2..363d549d2e0d 100644 --- a/drivers/tty/serial/8250/8250.h +++ b/drivers/tty/serial/8250/8250.h @@ -12,6 +12,35 @@ */ #include <linux/serial_8250.h> +#include <linux/dmaengine.h> + +struct uart_8250_dma { + dma_filter_fn fn; + void *rx_param; + void *tx_param; + + int rx_chan_id; + int tx_chan_id; + + struct dma_slave_config rxconf; + struct dma_slave_config txconf; + + struct dma_chan *rxchan; + struct dma_chan *txchan; + + dma_addr_t rx_addr; + dma_addr_t tx_addr; + + dma_cookie_t rx_cookie; + dma_cookie_t tx_cookie; + + void *rx_buf; + + size_t rx_size; + size_t tx_size; + + unsigned char tx_running:1; +}; struct old_serial_port { unsigned int uart; @@ -142,3 +171,24 @@ static inline int is_omap1510_8250(struct uart_8250_port *pt) return 0; } #endif + +#ifdef CONFIG_SERIAL_8250_DMA +extern int serial8250_tx_dma(struct uart_8250_port *); +extern int serial8250_rx_dma(struct uart_8250_port *, unsigned int iir); +extern int serial8250_request_dma(struct uart_8250_port *); +extern void serial8250_release_dma(struct uart_8250_port *); +#else +static inline int serial8250_tx_dma(struct uart_8250_port *p) +{ + return -1; +} +static inline int serial8250_rx_dma(struct uart_8250_port *p, unsigned int iir) +{ + return -1; +} +static inline int serial8250_request_dma(struct uart_8250_port *p) +{ + return -1; +} +static inline void serial8250_release_dma(struct uart_8250_port *p) { } +#endif |