Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc

Pull powerpc updates from Benjamin Herrenschmidt:
 "So from the depth of frozen Minnesota, here's the powerpc pull request
  for 3.9.  It has a few interesting highlights, in addition to the
  usual bunch of bug fixes, minor updates, embedded device tree updates
  and new boards:

   - Hand tuned asm implementation of SHA1 (by Paulus & Michael
     Ellerman)

   - Support for Doorbell interrupts on Power8 (kind of fast
     thread-thread IPIs) by Ian Munsie

   - Long overdue cleanup of the way we handle relocation of our open
     firmware trampoline (prom_init.c) on 64-bit by Anton Blanchard

   - Support for saving/restoring & context switching the PPR (Processor
     Priority Register) on server processors that support it.  This
     allows the kernel to preserve thread priorities established by
     userspace.  By Haren Myneni.

   - DAWR (new watchpoint facility) support on Power8 by Michael Neuling

   - Ability to change the DSCR (Data Stream Control Register) which
     controls cache prefetching on a running process via ptrace by
     Alexey Kardashevskiy

   - Support for context switching the TAR register on Power8 (new
     branch target register meant to be used by some new specific
     userspace perf event interrupt facility which is yet to be enabled)
     by Ian Munsie.

   - Improve preservation of the CFAR register (which captures the
     origin of a branch) on various exception conditions by Paulus.

   - Move the Bestcomm DMA driver from arch powerpc to drivers/dma where
     it belongs by Philippe De Muyter

   - Support for Transactional Memory on Power8 by Michael Neuling
     (based on original work by Matt Evans).  For those curious about
     the feature, the patch contains a pretty good description."

(See commit db8ff907027b: "powerpc: Documentation for transactional
memory on powerpc" for the mentioned description added to the file
Documentation/powerpc/transactional_memory.txt)

* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc: (140 commits)
  powerpc/kexec: Disable hard IRQ before kexec
  powerpc/85xx: l2sram - Add compatible string for BSC9131 platform
  powerpc/85xx: bsc9131 - Correct typo in SDHC device node
  powerpc/e500/qemu-e500: enable coreint
  powerpc/mpic: allow coreint to be determined by MPIC version
  powerpc/fsl_pci: Store the pci ctlr device ptr in the pci ctlr struct
  powerpc/85xx: Board support for ppa8548
  powerpc/fsl: remove extraneous DIU platform functions
  arch/powerpc/platforms/85xx/p1022_ds.c: adjust duplicate test
  powerpc: Documentation for transactional memory on powerpc
  powerpc: Add transactional memory to pseries and ppc64 defconfigs
  powerpc: Add config option for transactional memory
  powerpc: Add transactional memory to POWER8 cpu features
  powerpc: Add new transactional memory state to the signal context
  powerpc: Hook in new transactional memory code
  powerpc: Routines for FP/VSX/VMX unavailable during a transaction
  powerpc: Add transactional memory unavaliable execption handler
  powerpc: Add reclaim and recheckpoint functions for context switching transactional memory processes
  powerpc: Add FP/VSX and VMX register load functions for transactional memory
  powerpc: Add helper functions for transactional memory context switching
  ...

1 files changed, 176 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/85xx/sgy_cts1000.c b/arch/powerpc/platforms/85xx/sgy_cts1000.c
new file mode 100644
index 00000000000..611e92f291c
--- /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");