fe0c935a6c
This patch series cleans up some misconceptions about pm_ops. Some users of the pm_ops structure attempt to use it to stop the user from entering suspend to disk, this, however, is not possible since the user can always use "shutdown" in /sys/power/disk and then the pm_ops are never invoked. Also, platforms that don't support suspend to disk simply should not allow configuring SOFTWARE_SUSPEND (read the help text on it, it only selects suspend to disk and nothing else, all the other stuff depends on PM). The pm_ops structure is actually intended to provide a way to enter platform-defined sleep states (currently supported states are "standby" and "mem" (suspend to ram)) and additionally (if SOFTWARE_SUSPEND is configured) allows a platform to support a platform specific way to enter low-power mode once everything has been saved to disk. This is currently only used by ACPI (S4). This patch: The pm_ops.pm_disk_mode is used in totally bogus ways since nobody really seems to understand what it actually does. This patch clarifies the pm_disk_mode description. It also removes all the arm and sh users that think they can veto suspend to disk via pm_ops; not so since the user can always do echo shutdown > /sys/power/disk, they need to find a better way involving Kconfig or such. ACPI is the only user left with a non-zero pm_disk_mode. The patch also sets the default mode to shutdown again, but when a new pm_ops is registered its pm_disk_mode is selected as default, that way the default stays for ACPI where it is apparently required. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Cc: David Brownell <david-b@pacbell.net> Acked-by: Pavel Machek <pavel@ucw.cz> Cc: <linux-pm@lists.linux-foundation.org> Cc: Len Brown <lenb@kernel.org> Acked-by: Russell King <rmk@arm.linux.org.uk> Cc: Greg KH <greg@kroah.com> Cc: "Rafael J. Wysocki" <rjw@sisk.pl> Acked-by: Paul Mundt <lethal@linux-sh.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
81 lines
1.5 KiB
C
81 lines
1.5 KiB
C
/*
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* hp6x0 Power Management Routines
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*
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* Copyright (c) 2006 Andriy Skulysh <askulsyh@gmail.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License.
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*/
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#include <linux/init.h>
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#include <linux/suspend.h>
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#include <linux/errno.h>
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#include <linux/time.h>
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#include <asm/io.h>
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#include <asm/hd64461.h>
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#include <asm/hp6xx.h>
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#include <asm/cpu/dac.h>
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#include <asm/pm.h>
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#define STBCR 0xffffff82
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#define STBCR2 0xffffff88
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static int hp6x0_pm_enter(suspend_state_t state)
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{
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u8 stbcr, stbcr2;
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#ifdef CONFIG_HD64461_ENABLER
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u8 scr;
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u16 hd64461_stbcr;
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#endif
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#ifdef CONFIG_HD64461_ENABLER
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outb(0, HD64461_PCC1CSCIER);
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scr = inb(HD64461_PCC1SCR);
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scr |= HD64461_PCCSCR_VCC1;
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outb(scr, HD64461_PCC1SCR);
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hd64461_stbcr = inw(HD64461_STBCR);
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hd64461_stbcr |= HD64461_STBCR_SPC1ST;
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outw(hd64461_stbcr, HD64461_STBCR);
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#endif
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ctrl_outb(0x1f, DACR);
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stbcr = ctrl_inb(STBCR);
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ctrl_outb(0x01, STBCR);
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stbcr2 = ctrl_inb(STBCR2);
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ctrl_outb(0x7f , STBCR2);
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outw(0xf07f, HD64461_SCPUCR);
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pm_enter();
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outw(0, HD64461_SCPUCR);
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ctrl_outb(stbcr, STBCR);
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ctrl_outb(stbcr2, STBCR2);
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#ifdef CONFIG_HD64461_ENABLER
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hd64461_stbcr = inw(HD64461_STBCR);
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hd64461_stbcr &= ~HD64461_STBCR_SPC1ST;
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outw(hd64461_stbcr, HD64461_STBCR);
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outb(0x4c, HD64461_PCC1CSCIER);
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outb(0x00, HD64461_PCC1CSCR);
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#endif
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return 0;
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}
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static struct pm_ops hp6x0_pm_ops = {
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.enter = hp6x0_pm_enter,
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};
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static int __init hp6x0_pm_init(void)
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{
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pm_set_ops(&hp6x0_pm_ops);
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return 0;
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}
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late_initcall(hp6x0_pm_init);
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