diff options
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/stm32-usart.c | 21 | ||||
| -rw-r--r-- | drivers/tty/serial/stm32-usart.h | 7 |
2 files changed, 25 insertions, 3 deletions
diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c index 959f33bb0eb6..fd9fb33ce4fe 100644 --- a/drivers/tty/serial/stm32-usart.c +++ b/drivers/tty/serial/stm32-usart.c @@ -547,6 +547,9 @@ static void stm32_throttle(struct uart_port *port) spin_lock_irqsave(&port->lock, flags); stm32_clr_bits(port, ofs->cr1, stm32_port->cr1_irq); + if (stm32_port->cr3_irq) + stm32_clr_bits(port, ofs->cr3, stm32_port->cr3_irq); + spin_unlock_irqrestore(&port->lock, flags); } @@ -559,6 +562,9 @@ static void stm32_unthrottle(struct uart_port *port) spin_lock_irqsave(&port->lock, flags); stm32_set_bits(port, ofs->cr1, stm32_port->cr1_irq); + if (stm32_port->cr3_irq) + stm32_set_bits(port, ofs->cr3, stm32_port->cr3_irq); + spin_unlock_irqrestore(&port->lock, flags); } @@ -569,6 +575,9 @@ static void stm32_stop_rx(struct uart_port *port) struct stm32_usart_offsets *ofs = &stm32_port->info->ofs; stm32_clr_bits(port, ofs->cr1, stm32_port->cr1_irq); + if (stm32_port->cr3_irq) + stm32_clr_bits(port, ofs->cr3, stm32_port->cr3_irq); + } /* Handle breaks - ignored by us */ @@ -597,8 +606,9 @@ static int stm32_startup(struct uart_port *port) if (stm32_port->fifoen) { val = readl_relaxed(port->membase + ofs->cr3); - val &= ~USART_CR3_TXFTCFG_MASK; + val &= ~(USART_CR3_TXFTCFG_MASK | USART_CR3_RXFTCFG_MASK); val |= USART_CR3_TXFTCFG_HALF << USART_CR3_TXFTCFG_SHIFT; + val |= USART_CR3_RXFTCFG_HALF << USART_CR3_RXFTCFG_SHIFT; writel_relaxed(val, port->membase + ofs->cr3); } @@ -690,7 +700,7 @@ static void stm32_set_termios(struct uart_port *port, struct ktermios *termios, cr1 |= USART_CR1_FIFOEN; cr2 = 0; cr3 = readl_relaxed(port->membase + ofs->cr3); - cr3 &= USART_CR3_TXFTIE | USART_CR3_RXFTCFG | USART_CR3_RXFTIE + cr3 &= USART_CR3_TXFTIE | USART_CR3_RXFTCFG_MASK | USART_CR3_RXFTIE | USART_CR3_TXFTCFG_MASK; if (cflag & CSTOPB) @@ -730,8 +740,14 @@ static void stm32_set_termios(struct uart_port *port, struct ktermios *termios, stm32_port->cr1_irq = USART_CR1_RTOIE; writel_relaxed(bits, port->membase + ofs->rtor); cr2 |= USART_CR2_RTOEN; + /* Not using dma, enable fifo threshold irq */ + if (!stm32_port->rx_ch) + stm32_port->cr3_irq = USART_CR3_RXFTIE; } + cr1 |= stm32_port->cr1_irq; + cr3 |= stm32_port->cr3_irq; + if (cflag & PARODD) cr1 |= USART_CR1_PS; @@ -973,6 +989,7 @@ static struct stm32_port *stm32_of_get_stm32_port(struct platform_device *pdev) "st,hw-flow-ctrl"); stm32_ports[id].port.line = id; stm32_ports[id].cr1_irq = USART_CR1_RXNEIE; + stm32_ports[id].cr3_irq = 0; stm32_ports[id].last_res = RX_BUF_L; return &stm32_ports[id]; } diff --git a/drivers/tty/serial/stm32-usart.h b/drivers/tty/serial/stm32-usart.h index a5984463e113..a175c1094dc8 100644 --- a/drivers/tty/serial/stm32-usart.h +++ b/drivers/tty/serial/stm32-usart.h @@ -210,7 +210,8 @@ struct stm32_usart_info stm32h7_info = { #define USART_CR3_WUFIE BIT(22) /* H7 */ #define USART_CR3_TXFTIE BIT(23) /* H7 */ #define USART_CR3_TCBGTIE BIT(24) /* H7 */ -#define USART_CR3_RXFTCFG GENMASK(27, 25) /* H7 */ +#define USART_CR3_RXFTCFG_MASK GENMASK(27, 25) /* H7 */ +#define USART_CR3_RXFTCFG_SHIFT 25 /* H7 */ #define USART_CR3_RXFTIE BIT(28) /* H7 */ #define USART_CR3_TXFTCFG_MASK GENMASK(31, 29) /* H7 */ #define USART_CR3_TXFTCFG_SHIFT 29 /* H7 */ @@ -218,6 +219,9 @@ struct stm32_usart_info stm32h7_info = { /* TX FIFO threashold set to half of its depth */ #define USART_CR3_TXFTCFG_HALF 0x2 +/* RX FIFO threashold set to half of its depth */ +#define USART_CR3_RXFTCFG_HALF 0x2 + /* USART_GTPR */ #define USART_GTPR_PSC_MASK GENMASK(7, 0) #define USART_GTPR_GT_MASK GENMASK(15, 8) @@ -263,6 +267,7 @@ struct stm32_port { dma_addr_t tx_dma_buf; /* dma tx buffer bus address */ unsigned char *tx_buf; /* dma tx buffer cpu address */ u32 cr1_irq; /* USART_CR1_RXNEIE or RTOIE */ + u32 cr3_irq; /* USART_CR3_RXFTIE */ int last_res; bool tx_dma_busy; /* dma tx busy */ bool hw_flow_control; |