diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/tty/serial/mps2-uart.c | 91 |
1 files changed, 65 insertions, 26 deletions
diff --git a/drivers/tty/serial/mps2-uart.c b/drivers/tty/serial/mps2-uart.c index 6da0633f36ee..4404eb7d118f 100644 --- a/drivers/tty/serial/mps2-uart.c +++ b/drivers/tty/serial/mps2-uart.c @@ -66,11 +66,14 @@ #define MPS2_MAX_PORTS 3 +#define UART_PORT_COMBINED_IRQ BIT(0) + struct mps2_uart_port { struct uart_port port; struct clk *clk; unsigned int tx_irq; unsigned int rx_irq; + unsigned int flags; }; static inline struct mps2_uart_port *to_mps2_port(struct uart_port *port) @@ -265,6 +268,20 @@ static irqreturn_t mps2_uart_oerrirq(int irq, void *data) return handled; } +static irqreturn_t mps2_uart_combinedirq(int irq, void *data) +{ + if (mps2_uart_rxirq(irq, data) == IRQ_HANDLED) + return IRQ_HANDLED; + + if (mps2_uart_txirq(irq, data) == IRQ_HANDLED) + return IRQ_HANDLED; + + if (mps2_uart_oerrirq(irq, data) == IRQ_HANDLED) + return IRQ_HANDLED; + + return IRQ_NONE; +} + static int mps2_uart_startup(struct uart_port *port) { struct mps2_uart_port *mps_port = to_mps2_port(port); @@ -275,26 +292,37 @@ static int mps2_uart_startup(struct uart_port *port) mps2_uart_write8(port, control, UARTn_CTRL); - ret = request_irq(mps_port->rx_irq, mps2_uart_rxirq, 0, - MAKE_NAME(-rx), mps_port); - if (ret) { - dev_err(port->dev, "failed to register rxirq (%d)\n", ret); - return ret; - } + if (mps_port->flags & UART_PORT_COMBINED_IRQ) { + ret = request_irq(port->irq, mps2_uart_combinedirq, 0, + MAKE_NAME(-combined), mps_port); - ret = request_irq(mps_port->tx_irq, mps2_uart_txirq, 0, - MAKE_NAME(-tx), mps_port); - if (ret) { - dev_err(port->dev, "failed to register txirq (%d)\n", ret); - goto err_free_rxirq; - } + if (ret) { + dev_err(port->dev, "failed to register combinedirq (%d)\n", ret); + return ret; + } + } else { + ret = request_irq(port->irq, mps2_uart_oerrirq, IRQF_SHARED, + MAKE_NAME(-overrun), mps_port); + + if (ret) { + dev_err(port->dev, "failed to register oerrirq (%d)\n", ret); + return ret; + } - ret = request_irq(port->irq, mps2_uart_oerrirq, IRQF_SHARED, - MAKE_NAME(-overrun), mps_port); + ret = request_irq(mps_port->rx_irq, mps2_uart_rxirq, 0, + MAKE_NAME(-rx), mps_port); + if (ret) { + dev_err(port->dev, "failed to register rxirq (%d)\n", ret); + goto err_free_oerrirq; + } + + ret = request_irq(mps_port->tx_irq, mps2_uart_txirq, 0, + MAKE_NAME(-tx), mps_port); + if (ret) { + dev_err(port->dev, "failed to register txirq (%d)\n", ret); + goto err_free_rxirq; + } - if (ret) { - dev_err(port->dev, "failed to register oerrirq (%d)\n", ret); - goto err_free_txirq; } control |= UARTn_CTRL_RX_GRP | UARTn_CTRL_TX_GRP; @@ -303,10 +331,10 @@ static int mps2_uart_startup(struct uart_port *port) return 0; -err_free_txirq: - free_irq(mps_port->tx_irq, mps_port); err_free_rxirq: free_irq(mps_port->rx_irq, mps_port); +err_free_oerrirq: + free_irq(port->irq, mps_port); return ret; } @@ -320,8 +348,11 @@ static void mps2_uart_shutdown(struct uart_port *port) mps2_uart_write8(port, control, UARTn_CTRL); - free_irq(mps_port->rx_irq, mps_port); - free_irq(mps_port->tx_irq, mps_port); + if (!mps_port->flags & UART_PORT_COMBINED_IRQ) { + free_irq(mps_port->rx_irq, mps_port); + free_irq(mps_port->tx_irq, mps_port); + } + free_irq(port->irq, mps_port); } @@ -511,6 +542,10 @@ static int mps2_of_get_port(struct platform_device *pdev, if (id < 0) return id; + /* Only combined irq is presesnt */ + if (platform_irq_count(pdev) == 1) + mps_port->flags |= UART_PORT_COMBINED_IRQ; + mps_port->port.line = id; return 0; @@ -529,11 +564,6 @@ static int mps2_init_port(struct platform_device *pdev, mps_port->port.mapbase = res->start; mps_port->port.mapsize = resource_size(res); - - mps_port->rx_irq = platform_get_irq(pdev, 0); - mps_port->tx_irq = platform_get_irq(pdev, 1); - mps_port->port.irq = platform_get_irq(pdev, 2); - mps_port->port.iotype = UPIO_MEM; mps_port->port.flags = UPF_BOOT_AUTOCONF; mps_port->port.fifosize = 1; @@ -552,6 +582,15 @@ static int mps2_init_port(struct platform_device *pdev, clk_disable_unprepare(mps_port->clk); + + if (mps_port->flags & UART_PORT_COMBINED_IRQ) { + mps_port->port.irq = platform_get_irq(pdev, 0); + } else { + mps_port->rx_irq = platform_get_irq(pdev, 0); + mps_port->tx_irq = platform_get_irq(pdev, 1); + mps_port->port.irq = platform_get_irq(pdev, 2); + } + return ret; } |