diff options
| -rw-r--r-- | arch/mips/Kconfig | 6 | ||||
| -rw-r--r-- | arch/mips/include/asm/mach-malta/malta-pm.h | 37 | ||||
| -rw-r--r-- | arch/mips/mti-malta/Makefile | 2 | ||||
| -rw-r--r-- | arch/mips/mti-malta/malta-pm.c | 96 |
4 files changed, 141 insertions, 0 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 4e49591..2f2020f 100644 --- 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 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 a851601..b9510ea 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 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); |
