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>

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 4e49591f79cb3046b45ea6b39c8d62d34a685d99..2f2020f56898b436f249a57e4b88d1805ad303af 100644 (file)
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -1671,6 +1671,12 @@ config SYS_HAS_CPU_XLR
 config SYS_HAS_CPU_XLP
        bool
 
+config MIPS_MALTA_PM
+       depends on MIPS_MALTA
+       depends on PCI
+       bool
+       default y
+
 #
 # CPU may reorder R->R, R->W, W->R, W->W
 # Reordering beyond LL and SC is handled in WEAK_REORDERING_BEYOND_LLSC

diff --git a/arch/mips/include/asm/mach-malta/malta-pm.h b/arch/mips/include/asm/mach-malta/malta-pm.h
new file mode 100644 (file)
index 0000000..c2c2e20
--- /dev/null
+++ b/arch/mips/include/asm/mach-malta/malta-pm.h
@@ -0,0 +1,37 @@
+/*
+ * 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.
+ */
+
+#ifndef __ASM_MIPS_MACH_MALTA_PM_H__
+#define __ASM_MIPS_MACH_MALTA_PM_H__
+
+#include <asm/mips-boards/piix4.h>
+
+#ifdef CONFIG_MIPS_MALTA_PM
+
+/**
+ * mips_pm_suspend - enter a suspend state
+ * @state: the state to enter, one of PIIX4_FUNC3IO_PMCNTRL_SUS_TYP_*
+ *
+ * Enters a suspend state via the Malta's PIIX4. If the state to be entered
+ * is one which loses context (eg. SOFF) then this function will never
+ * return.
+ */
+extern int mips_pm_suspend(unsigned state);
+
+#else /* !CONFIG_MIPS_MALTA_PM */
+
+static inline int mips_pm_suspend(unsigned state)
+{
+       return -EINVAL;
+}
+
+#endif /* !CONFIG_MIPS_MALTA_PM */
+
+#endif /* __ASM_MIPS_MACH_MALTA_PM_H__ */

diff --git a/arch/mips/mti-malta/Makefile b/arch/mips/mti-malta/Makefile
index a85160137904be3404710552d9a9a0fb179846f3..b9510ea8db565d39761043b8e083926c48dc1b2b 100644 (file)
--- 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 (file)
index 0000000..c1e456c
--- /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);