serial: samsung: add struct s3c24xx_uart_dma
This struct contains DMA configuration for each serial port.
It will be used in next commits adding DMA support in driver.
Based on previous work of Sylwester Nawrocki and Lukasz Czerwinski.
Signed-off-by: Robert Baldyga <r.baldyga@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/tty/serial/samsung.h b/drivers/tty/serial/samsung.h
index eb071dd..8dc250c 100644
--- a/drivers/tty/serial/samsung.h
+++ b/drivers/tty/serial/samsung.h
@@ -12,6 +12,8 @@
* published by the Free Software Foundation.
*/
+#include <linux/dmaengine.h>
+
struct s3c24xx_uart_info {
char *name;
unsigned int type;
@@ -41,6 +43,40 @@
unsigned int fifosize[CONFIG_SERIAL_SAMSUNG_UARTS];
};
+struct s3c24xx_uart_dma {
+ dma_filter_fn fn;
+ void *rx_param;
+ void *tx_param;
+
+ unsigned int rx_chan_id;
+ unsigned int tx_chan_id;
+
+ struct dma_slave_config rx_conf;
+ struct dma_slave_config tx_conf;
+
+ struct dma_chan *rx_chan;
+ struct dma_chan *tx_chan;
+
+ dma_addr_t rx_addr;
+ dma_addr_t tx_addr;
+
+ dma_cookie_t rx_cookie;
+ dma_cookie_t tx_cookie;
+
+ char *rx_buf;
+
+ dma_addr_t tx_transfer_addr;
+
+ size_t rx_size;
+ size_t tx_size;
+
+ struct dma_async_tx_descriptor *tx_desc;
+ struct dma_async_tx_descriptor *rx_desc;
+
+ int tx_bytes_requested;
+ int rx_bytes_requested;
+};
+
struct s3c24xx_uart_port {
unsigned char rx_claimed;
unsigned char tx_claimed;
@@ -59,6 +95,8 @@
/* reference to platform data */
struct s3c2410_uartcfg *cfg;
+ struct s3c24xx_uart_dma *dma;
+
#ifdef CONFIG_CPU_FREQ
struct notifier_block freq_transition;
#endif