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altera_uart: Add support for polling mode (IRQ-less)
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>
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@ -15,6 +15,7 @@
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/timer.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/console.h>
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@ -76,6 +77,7 @@
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*/
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struct altera_uart {
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struct uart_port port;
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struct timer_list tmr;
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unsigned int sigs; /* Local copy of line sigs */
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unsigned short imr; /* Local IMR mirror */
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};
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@ -168,6 +170,7 @@ static void altera_uart_set_termios(struct uart_port *port,
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tty_termios_encode_baud_rate(termios, baud, baud);
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spin_lock_irqsave(&port->lock, flags);
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uart_update_timeout(port, termios->c_cflag, baud);
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writel(baudclk, port->membase + ALTERA_UART_DIVISOR_REG);
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spin_unlock_irqrestore(&port->lock, flags);
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}
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@ -268,6 +271,15 @@ static irqreturn_t altera_uart_interrupt(int irq, void *data)
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return IRQ_RETVAL(isr);
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}
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static void altera_uart_timer(unsigned long data)
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{
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struct uart_port *port = (void *)data;
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struct altera_uart *pp = container_of(port, struct altera_uart, port);
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altera_uart_interrupt(0, port);
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mod_timer(&pp->tmr, jiffies + uart_poll_timeout(port));
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}
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static void altera_uart_config_port(struct uart_port *port, int flags)
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{
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port->type = PORT_ALTERA_UART;
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@ -284,6 +296,12 @@ static int altera_uart_startup(struct uart_port *port)
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unsigned long flags;
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int ret;
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if (!port->irq) {
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setup_timer(&pp->tmr, altera_uart_timer, (unsigned long)port);
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mod_timer(&pp->tmr, jiffies + uart_poll_timeout(port));
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return 0;
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}
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ret = request_irq(port->irq, altera_uart_interrupt, IRQF_DISABLED,
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DRV_NAME, port);
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if (ret) {
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@ -316,7 +334,10 @@ static void altera_uart_shutdown(struct uart_port *port)
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spin_unlock_irqrestore(&port->lock, flags);
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free_irq(port->irq, port);
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if (port->irq)
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free_irq(port->irq, port);
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else
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del_timer_sync(&pp->tmr);
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}
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static const char *altera_uart_type(struct uart_port *port)
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