diff options
| author | Alexandre TORGUE <alexandre.torgue@st.com> | 2016-09-15 18:42:40 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-09-22 11:48:55 +0200 |
| commit | 3489187204eb75e5635d8836babfd0a18be613f4 (patch) | |
| tree | f5326fff1fa41e7ce789edb4a0ae46cd43607a39 /drivers/tty/serial/stm32-usart.h | |
| parent | dt-bindings: Add DMA bindings for STM32 USART (diff) | |
| download | linux-3489187204eb75e5635d8836babfd0a18be613f4.tar.xz linux-3489187204eb75e5635d8836babfd0a18be613f4.zip | |
serial: stm32: adding dma support
This patch adds dma mode support for rx and tx
with pio mode as fallback in case of dma error.
Signed-off-by: Gerald Baeza <gerald.baeza@st.com>
Signed-off-by: Alexandre TORGUE <alexandre.torgue@st.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/stm32-usart.h')
| -rw-r--r-- | drivers/tty/serial/stm32-usart.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/tty/serial/stm32-usart.h b/drivers/tty/serial/stm32-usart.h index 75f8388c91df..41d974923102 100644 --- a/drivers/tty/serial/stm32-usart.h +++ b/drivers/tty/serial/stm32-usart.h @@ -99,6 +99,9 @@ struct stm32_usart_info stm32f7_info = { /* Dummy bits */ #define USART_SR_DUMMY_RX BIT(16) +/* USART_ICR (F7) */ +#define USART_CR_TC BIT(6) + /* USART_DR */ #define USART_DR_MASK GENMASK(8, 0) @@ -204,10 +207,21 @@ struct stm32_usart_info stm32f7_info = { #define STM32_SERIAL_NAME "ttyS" #define STM32_MAX_PORTS 6 +#define RX_BUF_L 200 /* dma rx buffer length */ +#define RX_BUF_P RX_BUF_L /* dma rx buffer period */ +#define TX_BUF_L 200 /* dma tx buffer length */ + struct stm32_port { struct uart_port port; struct clk *clk; struct stm32_usart_info *info; + struct dma_chan *rx_ch; /* dma rx channel */ + dma_addr_t rx_dma_buf; /* dma rx buffer bus address */ + unsigned char *rx_buf; /* dma rx buffer cpu address */ + struct dma_chan *tx_ch; /* dma tx channel */ + dma_addr_t tx_dma_buf; /* dma tx buffer bus address */ + unsigned char *tx_buf; /* dma tx buffer cpu address */ + bool tx_dma_busy; /* dma tx busy */ bool hw_flow_control; }; |