diff options
Diffstat (limited to 'drivers/tty/serial/atmel_serial.c')
| -rw-r--r-- | drivers/tty/serial/atmel_serial.c | 51 |
1 files changed, 48 insertions, 3 deletions
diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c index fabbe76203bb..dcebb28ffbc4 100644 --- a/drivers/tty/serial/atmel_serial.c +++ b/drivers/tty/serial/atmel_serial.c @@ -175,6 +175,17 @@ struct atmel_uart_port { unsigned int pending_status; spinlock_t lock_suspended; + struct { + u32 cr; + u32 mr; + u32 imr; + u32 brgr; + u32 rtor; + u32 ttgr; + u32 fmr; + u32 fimr; + } cache; + int (*prepare_rx)(struct uart_port *port); int (*prepare_tx)(struct uart_port *port); void (*schedule_rx)(struct uart_port *port); @@ -1758,7 +1769,9 @@ static void atmel_get_ip_name(struct uart_port *port) /* * Only USART devices from at91sam9260 SOC implement fractional - * baudrate. + * baudrate. It is available for all asynchronous modes, with the + * following restriction: the sampling clock's duty cycle is not + * constant. */ atmel_port->has_frac_baudrate = false; atmel_port->has_hw_timer = false; @@ -2202,8 +2215,7 @@ static void atmel_set_termios(struct uart_port *port, struct ktermios *termios, * then * 8 CD + FP = selected clock / (2 * baudrate) */ - if (atmel_port->has_frac_baudrate && - (mode & ATMEL_US_USMODE) == ATMEL_US_USMODE_NORMAL) { + if (atmel_port->has_frac_baudrate) { div = DIV_ROUND_CLOSEST(port->uartclk, baud * 2); cd = div >> 3; fp = div & ATMEL_US_FP_MASK; @@ -2659,6 +2671,20 @@ static int atmel_serial_suspend(struct platform_device *pdev, cpu_relax(); } + if (atmel_is_console_port(port) && !console_suspend_enabled) { + /* Cache register values as we won't get a full shutdown/startup + * cycle + */ + atmel_port->cache.mr = atmel_uart_readl(port, ATMEL_US_MR); + atmel_port->cache.imr = atmel_uart_readl(port, ATMEL_US_IMR); + atmel_port->cache.brgr = atmel_uart_readl(port, ATMEL_US_BRGR); + atmel_port->cache.rtor = atmel_uart_readl(port, + atmel_port->rtor); + atmel_port->cache.ttgr = atmel_uart_readl(port, ATMEL_US_TTGR); + atmel_port->cache.fmr = atmel_uart_readl(port, ATMEL_US_FMR); + atmel_port->cache.fimr = atmel_uart_readl(port, ATMEL_US_FIMR); + } + /* we can not wake up if we're running on slow clock */ atmel_port->may_wakeup = device_may_wakeup(&pdev->dev); if (atmel_serial_clk_will_stop()) { @@ -2681,6 +2707,25 @@ static int atmel_serial_resume(struct platform_device *pdev) struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); unsigned long flags; + if (atmel_is_console_port(port) && !console_suspend_enabled) { + atmel_uart_writel(port, ATMEL_US_MR, atmel_port->cache.mr); + atmel_uart_writel(port, ATMEL_US_IER, atmel_port->cache.imr); + atmel_uart_writel(port, ATMEL_US_BRGR, atmel_port->cache.brgr); + atmel_uart_writel(port, atmel_port->rtor, + atmel_port->cache.rtor); + atmel_uart_writel(port, ATMEL_US_TTGR, atmel_port->cache.ttgr); + + if (atmel_port->fifo_size) { + atmel_uart_writel(port, ATMEL_US_CR, ATMEL_US_FIFOEN | + ATMEL_US_RXFCLR | ATMEL_US_TXFLCLR); + atmel_uart_writel(port, ATMEL_US_FMR, + atmel_port->cache.fmr); + atmel_uart_writel(port, ATMEL_US_FIER, + atmel_port->cache.fimr); + } + atmel_start_rx(port); + } + spin_lock_irqsave(&atmel_port->lock_suspended, flags); if (atmel_port->pending) { atmel_handle_receive(port, atmel_port->pending); |