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MIPS: Malta: Use PIIX4 poweroff driver to power down

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Remove the platform code used to power down the system, instead relying
upon the new PIIX4 poweroff driver. This reduces the amount of platform
code required for the Malta board in preparation for allowing it to be
part of a more generic kernel.

Signed-off-by: Paul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/14282/
This commit is contained in:
Paul Burton 2016-09-19 22:21:31 +01:00
parent a07539c000
commit dd129c6374
No known key found for this signature in database
GPG Key ID: 3EA79FACB57500DD
13 changed files with 9 additions and 134 deletions
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6
arch/mips/Kconfig
View File

@ -1974,12 +1974,6 @@ 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

1
arch/mips/configs/malta_defconfig
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@ -317,6 +317,7 @@ CONFIG_MOUSE_PS2_ELANTECH=y
CONFIG_SERIAL_8250=y
CONFIG_SERIAL_8250_CONSOLE=y
CONFIG_POWER_RESET=y
CONFIG_POWER_RESET_PIIX4_POWEROFF=y
CONFIG_POWER_RESET_SYSCON=y
# CONFIG_HWMON is not set
CONFIG_FB=y

1
arch/mips/configs/malta_kvm_defconfig
View File

@ -328,6 +328,7 @@ CONFIG_INPUT_MOUSEDEV=y
CONFIG_SERIAL_8250=y
CONFIG_SERIAL_8250_CONSOLE=y
CONFIG_POWER_RESET=y
CONFIG_POWER_RESET_PIIX4_POWEROFF=y
CONFIG_POWER_RESET_SYSCON=y
# CONFIG_HWMON is not set
CONFIG_FB=y

1
arch/mips/configs/malta_kvm_guest_defconfig
View File

@ -330,6 +330,7 @@ CONFIG_INPUT_MOUSEDEV=y
CONFIG_SERIAL_8250=y
CONFIG_SERIAL_8250_CONSOLE=y
CONFIG_POWER_RESET=y
CONFIG_POWER_RESET_PIIX4_POWEROFF=y
CONFIG_POWER_RESET_SYSCON=y
# CONFIG_HWMON is not set
CONFIG_FB=y

1
arch/mips/configs/malta_qemu_32r6_defconfig
View File

@ -133,6 +133,7 @@ CONFIG_SERIAL_8250=y
CONFIG_SERIAL_8250_CONSOLE=y
CONFIG_HW_RANDOM=y
CONFIG_POWER_RESET=y
CONFIG_POWER_RESET_PIIX4_POWEROFF=y
CONFIG_POWER_RESET_SYSCON=y
# CONFIG_HWMON is not set
CONFIG_FB=y

1
arch/mips/configs/maltaaprp_defconfig
View File

@ -133,6 +133,7 @@ CONFIG_SERIAL_8250=y
CONFIG_SERIAL_8250_CONSOLE=y
CONFIG_HW_RANDOM=y
CONFIG_POWER_RESET=y
CONFIG_POWER_RESET_PIIX4_POWEROFF=y
CONFIG_POWER_RESET_SYSCON=y
# CONFIG_HWMON is not set
CONFIG_FB=y

1
arch/mips/configs/maltasmvp_defconfig
View File

@ -134,6 +134,7 @@ CONFIG_SERIAL_8250=y
CONFIG_SERIAL_8250_CONSOLE=y
CONFIG_HW_RANDOM=y
CONFIG_POWER_RESET=y
CONFIG_POWER_RESET_PIIX4_POWEROFF=y
CONFIG_POWER_RESET_SYSCON=y
# CONFIG_HWMON is not set
CONFIG_FB=y

1
arch/mips/configs/maltasmvp_eva_defconfig
View File

@ -137,6 +137,7 @@ CONFIG_SERIAL_8250=y
CONFIG_SERIAL_8250_CONSOLE=y
CONFIG_HW_RANDOM=y
CONFIG_POWER_RESET=y
CONFIG_POWER_RESET_PIIX4_POWEROFF=y
CONFIG_POWER_RESET_SYSCON=y
# CONFIG_HWMON is not set
CONFIG_FB=y

1
arch/mips/configs/maltaup_defconfig
View File

@ -132,6 +132,7 @@ CONFIG_SERIAL_8250=y
CONFIG_SERIAL_8250_CONSOLE=y
CONFIG_HW_RANDOM=y
CONFIG_POWER_RESET=y
CONFIG_POWER_RESET_PIIX4_POWEROFF=y
CONFIG_POWER_RESET_SYSCON=y
# CONFIG_HWMON is not set
CONFIG_FB=y

1
arch/mips/configs/maltaup_xpa_defconfig
View File

@ -326,6 +326,7 @@ CONFIG_MOUSE_PS2_ELANTECH=y
CONFIG_SERIAL_8250=y
CONFIG_SERIAL_8250_CONSOLE=y
CONFIG_POWER_RESET=y
CONFIG_POWER_RESET_PIIX4_POWEROFF=y
CONFIG_POWER_RESET_SYSCON=y
# CONFIG_HWMON is not set
CONFIG_FB=y

2
arch/mips/mti-malta/Makefile
View File

@ -13,11 +13,9 @@ obj-y += malta-init.o
obj-y += malta-int.o
obj-y += malta-memory.o
obj-y += malta-platform.o
obj-y += malta-reset.o
obj-y += malta-setup.o
obj-y += malta-time.o
obj-$(CONFIG_MIPS_CMP) += malta-amon.o
obj-$(CONFIG_MIPS_MALTA_PM) += malta-pm.o
CFLAGS_malta-dtshim.o = -I$(src)/../../../scripts/dtc/libfdt

96
arch/mips/mti-malta/malta-pm.c
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@ -1,96 +0,0 @@
/*
* Copyright (C) 2014 Imagination Technologies
* Author: Paul Burton <paul.burton@mips.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);

30
arch/mips/mti-malta/malta-reset.c
View File

@ -1,30 +0,0 @@
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Carsten Langgaard, carstenl@mips.com
* Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved.
*/
#include <linux/io.h>
#include <linux/pm.h>
#include <linux/reboot.h>
#include <asm/reboot.h>
#include <asm/mach-malta/malta-pm.h>
static void mips_machine_power_off(void)
{
mips_pm_suspend(PIIX4_FUNC3IO_PMCNTRL_SUS_TYP_SOFF);
pr_info("Failed to power down, resetting\n");
machine_restart(NULL);
}
static int __init mips_reboot_setup(void)
{
pm_power_off = mips_machine_power_off;
return 0;
}
arch_initcall(mips_reboot_setup);