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Tue, 01 Sep 2015 02:36:00 -0700 (PDT) From: Zhaoyang Huang To: linux-pm@vger.kernel.org Cc: amit.kucheria@linaro.org Subject: [PATCH v2] modify the pl011 driver to let it work as wakeup source Date: Tue, 1 Sep 2015 17:35:49 +0800 Message-Id: <1441100149-28071-1-git-send-email-zhaoyang.huang@linaro.org> X-Mailer: git-send-email 1.7.9.5 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP the commit use the latest dev_pm_set_wake_irq API instead of the enable_irq_wake and IRQF_NO_SUSPEND to configure the ttyAMA device to work as the wakeup source Signed-off-by: Zhaoyang Huang --- drivers/tty/serial/amba-pl011.c | 55 ++++++++++++++++++++++++++++++++++++--- 1 file changed, 52 insertions(+), 3 deletions(-) diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c index 50cf5b1..33a479a 100644 --- a/drivers/tty/serial/amba-pl011.c +++ b/drivers/tty/serial/amba-pl011.c @@ -59,6 +59,10 @@ #include #include #include +#include +#include +#include "../../base/power/power.h" +#include #define UART_NR 14 @@ -127,6 +131,7 @@ static struct vendor_data vendor_st = { .get_fifosize = get_fifosize_st, }; +static int is_suspended = 0; /* Deals with DMA transactions */ struct pl011_sgbuf { @@ -1376,6 +1381,10 @@ static irqreturn_t pl011_int(int irq, void *dev_id) pl011_dma_rx_irq(uap); else pl011_rx_chars(uap); + + if(is_suspended) + pm_system_wakeup(); + } if (status & (UART011_DSRMIS|UART011_DCDMIS| UART011_CTSMIS|UART011_RIMIS)) @@ -2353,11 +2362,29 @@ static int pl011_register_port(struct uart_amba_port *uap) return ret; } +struct uart_match { + struct uart_port *port; + struct uart_driver *driver; +}; + +static int match_uart_port(struct device * dev, void * data) +{ + struct uart_match *match = data; + + dev_t devt = MKDEV(match->driver->major, match->driver->minor) + + match->port->line; + + pr_info("the match data of ttyAMA0 is %d %d\n",(int)devt,(int)dev->devt); + + return dev->devt == devt; /* Actually, only one tty per port */ +} static int pl011_probe(struct amba_device *dev, const struct amba_id *id) { struct uart_amba_port *uap; struct vendor_data *vendor = id->data; int portnr, ret; + struct device * uart_dev; + struct uart_match match; portnr = pl011_find_free_port(); if (portnr < 0) @@ -2387,7 +2414,17 @@ static int pl011_probe(struct amba_device *dev, const struct amba_id *id) amba_set_drvdata(dev, uap); - return pl011_register_port(uap); + ret = pl011_register_port(uap); + + match.port = &uap->port; + match.driver = &amba_reg; + + uart_dev = device_find_child(&dev->dev, &match,match_uart_port); + + device_init_wakeup(uart_dev, true); + dev_pm_set_wake_irq(uart_dev, uap->port.irq); + + return ret; } static int pl011_remove(struct amba_device *dev) @@ -2403,21 +2440,33 @@ static int pl011_remove(struct amba_device *dev) static int pl011_suspend(struct device *dev) { struct uart_amba_port *uap = dev_get_drvdata(dev); + int ret = 0; if (!uap) return -EINVAL; - return uart_suspend_port(&amba_reg, &uap->port); + ret =uart_suspend_port(&amba_reg, &uap->port); + + if(!ret) + is_suspended = 1; + + return ret; } static int pl011_resume(struct device *dev) { struct uart_amba_port *uap = dev_get_drvdata(dev); + int ret = 0; if (!uap) return -EINVAL; - return uart_resume_port(&amba_reg, &uap->port); + ret = uart_resume_port(&amba_reg, &uap->port); + + if(!ret) + is_suspended = 0; + + return ret; } #endif