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serial: omap: Add support for optional wake-up 

With the recent pinctrl-single changes, omaps can treat
wake-up events from deeper idle states as interrupts.

There's a separate "io chain" controller on most omaps
that stays enabled when the device hits off-idle and the
regular interrupt controller is powered off.

Let's add support for the optional second interrupt for
wake-up events. And then serial-omap can manage the
wake-up interrupt from it's runtime PM calls to avoid
spurious interrupts during runtime.

Note that the wake interrupt is board specific as it
uses the UART RX pin, and for omap3, there are six pin
options for UART3 RX pin.

Also Note that the legacy platform based booting handles
the wake-ups in the legacy mux driver and does not need to
pass the wake-up interrupt to the driver.

And finally, to pass the wake-up interrupt in the dts file,
either interrupt-map or the pending interrupts-extended
property needs to be passed. It's probably best to use
interrupts-extended when it's available.

Cc: Felipe Balbi <balbi@ti.com>
Cc: Kevin Hilman <khilman@linaro.org>
Cc: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Felipe Balbi <balbi@ti.com>
Reviewed-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Tony Lindgren 2013-10-22 06:49:48 -07:00 committed by Greg Kroah-Hartman
parent 24b6bb0714
commit 2a0b965cfb
1 changed files with 46 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

54
drivers/tty/serial/omap-serial.c
View File

@ -39,6 +39,7 @@
#include <linux/irq.h>
#include <linux/pm_runtime.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/gpio.h>
#include <linux/of_gpio.h>
#include <linux/platform_data/serial-omap.h>
@ -134,6 +135,7 @@ struct uart_omap_port {
struct uart_port port;
struct uart_omap_dma uart_dma;
struct device *dev;
int wakeirq;
unsigned char ier;
unsigned char lcr;
@ -214,10 +216,23 @@ static int serial_omap_get_context_loss_count(struct uart_omap_port *up)
return pdata->get_context_loss_count(up->dev);
}
static inline void serial_omap_enable_wakeirq(struct uart_omap_port *up,
bool enable)
{
if (!up->wakeirq)
return;
if (enable)
enable_irq(up->wakeirq);
else
disable_irq(up->wakeirq);
}
static void serial_omap_enable_wakeup(struct uart_omap_port *up, bool enable)
{
struct omap_uart_port_info *pdata = dev_get_platdata(up->dev);
serial_omap_enable_wakeirq(up, enable);
if (!pdata || !pdata->enable_wakeup)
return;
@ -699,6 +714,20 @@ static int serial_omap_startup(struct uart_port *port)
if (retval)
return retval;
/* Optional wake-up IRQ */
if (up->wakeirq) {
retval = request_irq(up->wakeirq, serial_omap_irq,
up->port.irqflags, up->name, up);
if (retval) {
free_irq(up->port.irq, up);
return retval;
}
disable_irq(up->wakeirq);
} else {
dev_info(up->port.dev, "no wakeirq for uart%d\n",
up->port.line);
}
dev_dbg(up->port.dev, "serial_omap_startup+%d\n", up->port.line);
pm_runtime_get_sync(up->dev);
@ -787,6 +816,8 @@ static void serial_omap_shutdown(struct uart_port *port)
pm_runtime_mark_last_busy(up->dev);
pm_runtime_put_autosuspend(up->dev);
free_irq(up->port.irq, up);
if (up->wakeirq)
free_irq(up->wakeirq, up);
}
static void serial_omap_uart_qos_work(struct work_struct *work)
@ -1572,11 +1603,23 @@ static int serial_omap_probe(struct platform_device *pdev)
struct uart_omap_port *up;
struct resource *mem, *irq;
struct omap_uart_port_info *omap_up_info = dev_get_platdata(&pdev->dev);
int ret;
int ret, uartirq = 0, wakeirq = 0;
/* The optional wakeirq may be specified in the board dts file */
if (pdev->dev.of_node) {
uartirq = irq_of_parse_and_map(pdev->dev.of_node, 0);
if (!uartirq)
return -EPROBE_DEFER;
wakeirq = irq_of_parse_and_map(pdev->dev.of_node, 1);
omap_up_info = of_get_uart_port_info(&pdev->dev);
pdev->dev.platform_data = omap_up_info;
} else {
irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (!irq) {
dev_err(&pdev->dev, "no irq resource?\n");
return -ENODEV;
}
uartirq = irq->start;
}
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@ -1585,12 +1628,6 @@ static int serial_omap_probe(struct platform_device *pdev)
return -ENODEV;
}
irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (!irq) {
dev_err(&pdev->dev, "no irq resource?\n");
return -ENODEV;
}
if (!devm_request_mem_region(&pdev->dev, mem->start, resource_size(mem),
pdev->dev.driver->name)) {
dev_err(&pdev->dev, "memory region already claimed\n");
@ -1624,7 +1661,8 @@ static int serial_omap_probe(struct platform_device *pdev)
up->port.dev = &pdev->dev;
up->port.type = PORT_OMAP;
up->port.iotype = UPIO_MEM;
up->port.irq = irq->start;
up->port.irq = uartirq;
up->wakeirq = wakeirq;
up->port.regshift = 2;
up->port.fifosize = 64;