Commit 5611fe48 authored by Benjamin Collins's avatar Benjamin Collins Committed by Benjamin Herrenschmidt

powerpc: Add support for CTS-1000 GPIO controlled system poweroff

CTS-1000 is based on P4080. GPIO 27 is used to signal the FPGA to
switch off power, and also associates IRQ 8 with front-panel button
press (which we use to call orderly_poweroff()).

The relevant device-tree looks like this:

	gpio0: gpio@130000 {
		compatible = "fsl,qoriq-gpio";
		reg = <0x130000 0x1000>;
		interrupts = <55 2 0 0>;
		#gpio-cells = <2>;
		gpio-controller;

		/* Allows powering off the system via GPIO signal. */
		gpio-halt@27 {
			compatible = "sgy,gpio-halt";
			gpios = <&gpio0 27 0>;
			interrupts = <8 1 0 0>;
		};
	};

Because the driver cannot match on sgy,gpio-halt (because the node is never
processed through of_platform), it matches on fsl,qoriq-gpio and then
checks child nodes for the matching sgy,gpio-halt. This also ensures that
the GPIO controller is detected prior to sgy_cts1000's probe callback,
since that node wont match via of_platform until the controller is
registered.

Also, because the GPIO handler for triggering system poweroff might sleep,
the IRQ uses a workqueue to call orderly_poweroff().

As a final note, this driver may be expanded for other features specific to
the CTS-1000.
Signed-off-by: default avatarBen Collins <ben.c@servergy.com>
Cc: Jack Smith <jack.s@servergy.com>
Cc: Vihar Rai <vihar.r@servergy.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 34f364fe
......@@ -245,6 +245,14 @@ config P4080_DS
help
This option enables support for the P4080 DS board
config SGY_CTS1000
tristate "Servergy CTS-1000 support"
select GPIOLIB
select OF_GPIO
depends on P4080_DS
help
Enable this to support functionality in Servergy's CTS-1000 systems.
endif # PPC32
config P5020_DS
......
......@@ -30,3 +30,4 @@ obj-$(CONFIG_KSI8560) += ksi8560.o
obj-$(CONFIG_XES_MPC85xx) += xes_mpc85xx.o
obj-$(CONFIG_GE_IMP3A) += ge_imp3a.o
obj-$(CONFIG_PPC_QEMU_E500) += qemu_e500.o
obj-$(CONFIG_SGY_CTS1000) += sgy_cts1000.o
/*
* Servergy CTS-1000 Setup
*
* Maintained by Ben Collins <ben.c@servergy.com>
*
* Copyright 2012 by Servergy, Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include <linux/platform_device.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/of_gpio.h>
#include <linux/workqueue.h>
#include <linux/reboot.h>
#include <linux/interrupt.h>
#include <asm/machdep.h>
static struct device_node *halt_node;
static struct of_device_id child_match[] = {
{
.compatible = "sgy,gpio-halt",
},
{},
};
static void gpio_halt_wfn(struct work_struct *work)
{
/* Likely wont return */
orderly_poweroff(true);
}
static DECLARE_WORK(gpio_halt_wq, gpio_halt_wfn);
static void gpio_halt_cb(void)
{
enum of_gpio_flags flags;
int trigger, gpio;
if (!halt_node)
return;
gpio = of_get_gpio_flags(halt_node, 0, &flags);
if (!gpio_is_valid(gpio))
return;
trigger = (flags == OF_GPIO_ACTIVE_LOW);
printk(KERN_INFO "gpio-halt: triggering GPIO.\n");
/* Probably wont return */
gpio_set_value(gpio, trigger);
}
/* This IRQ means someone pressed the power button and it is waiting for us
* to handle the shutdown/poweroff. */
static irqreturn_t gpio_halt_irq(int irq, void *__data)
{
printk(KERN_INFO "gpio-halt: shutdown due to power button IRQ.\n");
schedule_work(&gpio_halt_wq);
return IRQ_HANDLED;
};
static int __devinit gpio_halt_probe(struct platform_device *pdev)
{
enum of_gpio_flags flags;
struct device_node *node = pdev->dev.of_node;
int gpio, err, irq;
int trigger;
if (!node)
return -ENODEV;
/* If there's no matching child, this isn't really an error */
halt_node = of_find_matching_node(node, child_match);
if (!halt_node)
return 0;
/* Technically we could just read the first one, but punish
* DT writers for invalid form. */
if (of_gpio_count(halt_node) != 1)
return -EINVAL;
/* Get the gpio number relative to the dynamic base. */
gpio = of_get_gpio_flags(halt_node, 0, &flags);
if (!gpio_is_valid(gpio))
return -EINVAL;
err = gpio_request(gpio, "gpio-halt");
if (err) {
printk(KERN_ERR "gpio-halt: error requesting GPIO %d.\n",
gpio);
halt_node = NULL;
return err;
}
trigger = (flags == OF_GPIO_ACTIVE_LOW);
gpio_direction_output(gpio, !trigger);
/* Now get the IRQ which tells us when the power button is hit */
irq = irq_of_parse_and_map(halt_node, 0);
err = request_irq(irq, gpio_halt_irq, IRQF_TRIGGER_RISING |
IRQF_TRIGGER_FALLING, "gpio-halt", halt_node);
if (err) {
printk(KERN_ERR "gpio-halt: error requesting IRQ %d for "
"GPIO %d.\n", irq, gpio);
gpio_free(gpio);
halt_node = NULL;
return err;
}
/* Register our halt function */
ppc_md.halt = gpio_halt_cb;
ppc_md.power_off = gpio_halt_cb;
printk(KERN_INFO "gpio-halt: registered GPIO %d (%d trigger, %d"
" irq).\n", gpio, trigger, irq);
return 0;
}
static int __devexit gpio_halt_remove(struct platform_device *pdev)
{
if (halt_node) {
int gpio = of_get_gpio(halt_node, 0);
int irq = irq_of_parse_and_map(halt_node, 0);
free_irq(irq, halt_node);
ppc_md.halt = NULL;
ppc_md.power_off = NULL;
gpio_free(gpio);
halt_node = NULL;
}
return 0;
}
static struct of_device_id gpio_halt_match[] = {
/* We match on the gpio bus itself and scan the children since they
* wont be matched against us. We know the bus wont match until it
* has been registered too. */
{
.compatible = "fsl,qoriq-gpio",
},
{},
};
MODULE_DEVICE_TABLE(of, gpio_halt_match);
static struct platform_driver gpio_halt_driver = {
.driver = {
.name = "gpio-halt",
.owner = THIS_MODULE,
.of_match_table = gpio_halt_match,
},
.probe = gpio_halt_probe,
.remove = __devexit_p(gpio_halt_remove),
};
module_platform_driver(gpio_halt_driver);
MODULE_DESCRIPTION("Driver to support GPIO triggered system halt for Servergy CTS-1000 Systems.");
MODULE_VERSION("1.0");
MODULE_AUTHOR("Ben Collins <ben.c@servergy.com>");
MODULE_LICENSE("GPL");
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment