From mboxrd@z Thu Jan 1 00:00:00 1970 From: festevam@gmail.com (Fabio Estevam) Date: Fri, 9 Dec 2011 16:41:05 -0200 Subject: [PATCH v4] tty: serial: imx: Allow UART to be a source for wakeup In-Reply-To: <1323434541-27689-1-git-send-email-festevam@gmail.com> References: <1323434541-27689-1-git-send-email-festevam@gmail.com> Message-ID: <1323456065-6240-1-git-send-email-festevam@gmail.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Allow UART to be a source for wakeup from low power mode. Tested on a MX27PDK by doing: echo enabled > /sys/devices/platform/imx21-uart.0/power/wakeup echo mem > /sys/power/state and then pressing a key in the console will wakeup the sytem. Signed-off-by: Fabio Estevam --- Changes since v3: - Remove IMXUART_CANWAKE flag. Let userspace write in /sys/ file in order to enable UART wakeup source. Changes since v2: - Remove incorrect enable_irq_wake from serial_imx_resume Changes since v1: - Pass the can-wake property via DT correctly drivers/tty/serial/imx.c | 24 ++++++++++++++++++++++++ 1 files changed, 24 insertions(+), 0 deletions(-) diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index 163fc90..283bf21 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -566,6 +566,9 @@ static irqreturn_t imx_int(int irq, void *dev_id) if (sts & USR1_RTSD) imx_rtsint(irq, dev_id); + if (sts & USR1_AWAKE) + writel(USR1_AWAKE, sport->port.membase + USR1); + return IRQ_HANDLED; } @@ -1269,6 +1272,15 @@ static struct uart_driver imx_reg = { static int serial_imx_suspend(struct platform_device *dev, pm_message_t state) { struct imx_port *sport = platform_get_drvdata(dev); + unsigned int val; + + if (device_may_wakeup(&dev->dev)) { + enable_irq_wake(sport->rxirq); + /* enable wakeup from i.MX UART */ + val = readl(sport->port.membase + UCR3); + val |= UCR3_AWAKEN; + writel(val, sport->port.membase + UCR3); + } if (sport) uart_suspend_port(&imx_reg, &sport->port); @@ -1279,6 +1291,15 @@ static int serial_imx_suspend(struct platform_device *dev, pm_message_t state) static int serial_imx_resume(struct platform_device *dev) { struct imx_port *sport = platform_get_drvdata(dev); + unsigned int val; + + if (device_may_wakeup(&dev->dev)) { + /* disable wakeup from i.MX UART */ + val = readl(sport->port.membase + UCR3); + val &= ~UCR3_AWAKEN; + writel(val, sport->port.membase + UCR3); + disable_irq_wake(sport->rxirq); + } if (sport) uart_resume_port(&imx_reg, &sport->port); @@ -1408,6 +1429,9 @@ static int serial_imx_probe(struct platform_device *pdev) goto deinit; platform_set_drvdata(pdev, &sport->port); + device_init_wakeup(&pdev->dev, 1); + device_set_wakeup_enable(&pdev->dev, 0); + return 0; deinit: if (pdata && pdata->exit) -- 1.7.1