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    Subject[PATCH 35/49] altera_uart: Add support for polling mode (IRQ-less)
    Date
    From: Anton Vorontsov <cbouatmailru@gmail.com>

    Some Altera UART implementations doesn't route the IRQ line, so we have
    to work in polling mode.

    Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
    Acked-by: Tobias Klauser <tklauser@distanz.ch>
    Cc: Alan Cox <alan@linux.intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
    ---
    drivers/serial/altera_uart.c | 23 ++++++++++++++++++++++-
    1 files changed, 22 insertions(+), 1 deletions(-)

    diff --git a/drivers/serial/altera_uart.c b/drivers/serial/altera_uart.c
    index f8d8a00..7dd58da 100644
    --- a/drivers/serial/altera_uart.c
    +++ b/drivers/serial/altera_uart.c
    @@ -15,6 +15,7 @@

    #include <linux/kernel.h>
    #include <linux/init.h>
    +#include <linux/timer.h>
    #include <linux/interrupt.h>
    #include <linux/module.h>
    #include <linux/console.h>
    @@ -76,6 +77,7 @@
    */
    struct altera_uart {
    struct uart_port port;
    + struct timer_list tmr;
    unsigned int sigs; /* Local copy of line sigs */
    unsigned short imr; /* Local IMR mirror */
    };
    @@ -168,6 +170,7 @@ static void altera_uart_set_termios(struct uart_port *port,
    tty_termios_encode_baud_rate(termios, baud, baud);

    spin_lock_irqsave(&port->lock, flags);
    + uart_update_timeout(port, termios->c_cflag, baud);
    writel(baudclk, port->membase + ALTERA_UART_DIVISOR_REG);
    spin_unlock_irqrestore(&port->lock, flags);
    }
    @@ -268,6 +271,15 @@ static irqreturn_t altera_uart_interrupt(int irq, void *data)
    return IRQ_RETVAL(isr);
    }

    +static void altera_uart_timer(unsigned long data)
    +{
    + struct uart_port *port = (void *)data;
    + struct altera_uart *pp = container_of(port, struct altera_uart, port);
    +
    + altera_uart_interrupt(0, port);
    + mod_timer(&pp->tmr, jiffies + uart_poll_timeout(port));
    +}
    +
    static void altera_uart_config_port(struct uart_port *port, int flags)
    {
    port->type = PORT_ALTERA_UART;
    @@ -284,6 +296,12 @@ static int altera_uart_startup(struct uart_port *port)
    unsigned long flags;
    int ret;

    + if (!port->irq) {
    + setup_timer(&pp->tmr, altera_uart_timer, (unsigned long)port);
    + mod_timer(&pp->tmr, jiffies + uart_poll_timeout(port));
    + return 0;
    + }
    +
    ret = request_irq(port->irq, altera_uart_interrupt, IRQF_DISABLED,
    DRV_NAME, port);
    if (ret) {
    @@ -316,7 +334,10 @@ static void altera_uart_shutdown(struct uart_port *port)

    spin_unlock_irqrestore(&port->lock, flags);

    - free_irq(port->irq, port);
    + if (port->irq)
    + free_irq(port->irq, port);
    + else
    + del_timer_sync(&pp->tmr);
    }

    static const char *altera_uart_type(struct uart_port *port)
    --
    1.7.2


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