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: Ben 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: Benjamin Herrenschmidt <benh@kernel.crashing.org>

3 files changed, 185 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/85xx/Kconfig b/arch/powerpc/platforms/85xx/Kconfig
index 02d02a09942d..651788cbc6e6 100644
--- a/arch/powerpc/platforms/85xx/Kconfig
+++ b/arch/powerpc/platforms/85xx/Kconfig
@@ -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
diff --git a/arch/powerpc/platforms/85xx/Makefile b/arch/powerpc/platforms/85xx/Makefile
index 76f679cb04a0..9db31dcbd320 100644
--- a/arch/powerpc/platforms/85xx/Makefile
+++ b/arch/powerpc/platforms/85xx/Makefile
@@ -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
diff --git a/arch/powerpc/platforms/85xx/sgy_cts1000.c b/arch/powerpc/platforms/85xx/sgy_cts1000.c
new file mode 100644
index 000000000000..611e92f291c4
--- /dev/null
+++ b/arch/powerpc/platforms/85xx/sgy_cts1000.c
@@ -0,0 +1,176 @@
+/*
+ * 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");