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serial: stm32: adding dma support

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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>
This commit is contained in:
Alexandre TORGUE
2016-09-15 18:42:40 +02:00
committed by Greg Kroah-Hartman
parent 3fa047fde4
commit 3489187204
2 changed files with 379 additions and 26 deletions
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14
drivers/tty/serial/stm32-usart.h
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@@ -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;
};