MIPS: Malta: add suspend state entry code

This patch introduces code which will enter a suspend state via the
PIIX4. This can only be done when PCI support is enabled since it
requires access to PCI I/O space and the generation of a special cycle
on the PCI bus. In cases where PCI is disabled the mips_pm_suspend
function will simply always return an error.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/6905/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

2 files changed, 98 insertions, 0 deletions

diff --git a/arch/mips/mti-malta/Makefile b/arch/mips/mti-malta/Makefile
index a85160137904..b9510ea8db56 100644
--- a/arch/mips/mti-malta/Makefile
+++ b/arch/mips/mti-malta/Makefile
@@ -8,3 +8,5 @@
 obj-y				:= malta-amon.o malta-display.o malta-init.o \
 				   malta-int.o malta-memory.o malta-platform.o \
 				   malta-reset.o malta-setup.o malta-time.o
+
+obj-$(CONFIG_MIPS_MALTA_PM)	+= malta-pm.o
diff --git a/arch/mips/mti-malta/malta-pm.c b/arch/mips/mti-malta/malta-pm.c
new file mode 100644
index 000000000000..c1e456c01a44
--- /dev/null
+++ b/arch/mips/mti-malta/malta-pm.c
@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 2014 Imagination Technologies
+ * Author: Paul Burton <paul.burton@imgtec.com>
+ *
+ * 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/delay.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/pci.h>
+
+#include <asm/mach-malta/malta-pm.h>
+
+static struct pci_bus *pm_pci_bus;
+static resource_size_t pm_io_offset;
+
+int mips_pm_suspend(unsigned state)
+{
+	int spec_devid;
+	u16 sts;
+
+	if (!pm_pci_bus || !pm_io_offset)
+		return -ENODEV;
+
+	/* Ensure the power button status is clear */
+	while (1) {
+		sts = inw(pm_io_offset + PIIX4_FUNC3IO_PMSTS);
+		if (!(sts & PIIX4_FUNC3IO_PMSTS_PWRBTN_STS))
+			break;
+		outw(sts, pm_io_offset + PIIX4_FUNC3IO_PMSTS);
+	}
+
+	/* Enable entry to suspend */
+	outw(state | PIIX4_FUNC3IO_PMCNTRL_SUS_EN,
+	     pm_io_offset + PIIX4_FUNC3IO_PMCNTRL);
+
+	/* If the special cycle occurs too soon this doesn't work... */
+	mdelay(10);
+
+	/*
+	 * The PIIX4 will enter the suspend state only after seeing a special
+	 * cycle with the correct magic data on the PCI bus. Generate that
+	 * cycle now.
+	 */
+	spec_devid = PCI_DEVID(0, PCI_DEVFN(0x1f, 0x7));
+	pci_bus_write_config_dword(pm_pci_bus, spec_devid, 0,
+				   PIIX4_SUSPEND_MAGIC);
+
+	/* Give the system some time to power down */
+	mdelay(1000);
+
+	return 0;
+}
+
+static int __init malta_pm_setup(void)
+{
+	struct pci_dev *dev;
+	int res, io_region = PCI_BRIDGE_RESOURCES;
+
+	/* Find a reference to the PCI bus */
+	pm_pci_bus = pci_find_next_bus(NULL);
+	if (!pm_pci_bus) {
+		pr_warn("malta-pm: failed to find reference to PCI bus\n");
+		return -ENODEV;
+	}
+
+	/* Find the PIIX4 PM device */
+	dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
+			     PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
+			     PCI_ANY_ID, NULL);
+	if (!dev) {
+		pr_warn("malta-pm: failed to find PIIX4 PM\n");
+		return -ENODEV;
+	}
+
+	/* Request access to the PIIX4 PM IO registers */
+	res = pci_request_region(dev, io_region, "PIIX4 PM IO registers");
+	if (res) {
+		pr_warn("malta-pm: failed to request PM IO registers (%d)\n",
+			res);
+		pci_dev_put(dev);
+		return -ENODEV;
+	}
+
+	/* Find the offset to the PIIX4 PM IO registers */
+	pm_io_offset = pci_resource_start(dev, io_region);
+
+	pci_dev_put(dev);
+	return 0;
+}
+
+late_initcall(malta_pm_setup);