diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/tty/serial/imx.c | 58 |
1 files changed, 37 insertions, 21 deletions
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index 167dea1adf90..fe3d41cc8416 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -217,6 +217,7 @@ struct imx_port { unsigned int dma_tx_nents; wait_queue_head_t dma_wait; unsigned int saved_reg[10]; + bool context_saved; }; struct imx_port_ucrs { @@ -1972,6 +1973,40 @@ static int serial_imx_remove(struct platform_device *pdev) return uart_remove_one_port(&imx_reg, &sport->port); } +static void serial_imx_restore_context(struct imx_port *sport) +{ + if (!sport->context_saved) + return; + + writel(sport->saved_reg[4], sport->port.membase + UFCR); + writel(sport->saved_reg[5], sport->port.membase + UESC); + writel(sport->saved_reg[6], sport->port.membase + UTIM); + writel(sport->saved_reg[7], sport->port.membase + UBIR); + writel(sport->saved_reg[8], sport->port.membase + UBMR); + writel(sport->saved_reg[9], sport->port.membase + IMX21_UTS); + writel(sport->saved_reg[0], sport->port.membase + UCR1); + writel(sport->saved_reg[1] | UCR2_SRST, sport->port.membase + UCR2); + writel(sport->saved_reg[2], sport->port.membase + UCR3); + writel(sport->saved_reg[3], sport->port.membase + UCR4); + sport->context_saved = false; +} + +static void serial_imx_save_context(struct imx_port *sport) +{ + /* Save necessary regs */ + sport->saved_reg[0] = readl(sport->port.membase + UCR1); + sport->saved_reg[1] = readl(sport->port.membase + UCR2); + sport->saved_reg[2] = readl(sport->port.membase + UCR3); + sport->saved_reg[3] = readl(sport->port.membase + UCR4); + sport->saved_reg[4] = readl(sport->port.membase + UFCR); + sport->saved_reg[5] = readl(sport->port.membase + UESC); + sport->saved_reg[6] = readl(sport->port.membase + UTIM); + sport->saved_reg[7] = readl(sport->port.membase + UBIR); + sport->saved_reg[8] = readl(sport->port.membase + UBMR); + sport->saved_reg[9] = readl(sport->port.membase + IMX21_UTS); + sport->context_saved = true; +} + static void serial_imx_enable_wakeup(struct imx_port *sport, bool on) { unsigned int val; @@ -2001,17 +2036,7 @@ static int imx_serial_port_suspend_noirq(struct device *dev) if (ret) return ret; - /* Save necessary regs */ - sport->saved_reg[0] = readl(sport->port.membase + UCR1); - sport->saved_reg[1] = readl(sport->port.membase + UCR2); - sport->saved_reg[2] = readl(sport->port.membase + UCR3); - sport->saved_reg[3] = readl(sport->port.membase + UCR4); - sport->saved_reg[4] = readl(sport->port.membase + UFCR); - sport->saved_reg[5] = readl(sport->port.membase + UESC); - sport->saved_reg[6] = readl(sport->port.membase + UTIM); - sport->saved_reg[7] = readl(sport->port.membase + UBIR); - sport->saved_reg[8] = readl(sport->port.membase + UBMR); - sport->saved_reg[9] = readl(sport->port.membase + IMX21_UTS); + serial_imx_save_context(sport); clk_disable(sport->clk_ipg); @@ -2028,16 +2053,7 @@ static int imx_serial_port_resume_noirq(struct device *dev) if (ret) return ret; - writel(sport->saved_reg[4], sport->port.membase + UFCR); - writel(sport->saved_reg[5], sport->port.membase + UESC); - writel(sport->saved_reg[6], sport->port.membase + UTIM); - writel(sport->saved_reg[7], sport->port.membase + UBIR); - writel(sport->saved_reg[8], sport->port.membase + UBMR); - writel(sport->saved_reg[9], sport->port.membase + IMX21_UTS); - writel(sport->saved_reg[0], sport->port.membase + UCR1); - writel(sport->saved_reg[1] | UCR2_SRST, sport->port.membase + UCR2); - writel(sport->saved_reg[2], sport->port.membase + UCR3); - writel(sport->saved_reg[3], sport->port.membase + UCR4); + serial_imx_restore_context(sport); clk_disable(sport->clk_ipg); |