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9178ba294b
The generic Linux framework to power off the machine is a function pointer called pm_power_off. The trick about this pointer is that device drivers can potentially implement it rather than board files. Today on powerpc we set pm_power_off to invoke our generic full machine power off logic which then calls ppc_md.power_off to invoke machine specific power off. However, when we want to add a power off GPIO via the "gpio-poweroff" driver, this card house falls apart. That driver only registers itself if pm_power_off is NULL to ensure it doesn't override board specific logic. However, since we always set pm_power_off to the generic power off logic (which will just not power off the machine if no ppc_md.power_off call is implemented), we can't implement power off via the generic GPIO power off driver. To fix this up, let's get rid of the ppc_md.power_off logic and just always use pm_power_off as was intended. Then individual drivers such as the GPIO power off driver can implement power off logic via that function pointer. With this patch set applied and a few patches on top of QEMU that implement a power off GPIO on the virt e500 machine, I can successfully turn off my virtual machine after halt. Signed-off-by: Alexander Graf <agraf@suse.de> [mpe: Squash into one patch and update changelog based on cover letter] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
109 lines
2.1 KiB
C
109 lines
2.1 KiB
C
/*
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* arch/powerpc/platforms/embedded6xx/gamecube.c
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*
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* Nintendo GameCube board-specific support
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* Copyright (C) 2004-2009 The GameCube Linux Team
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* Copyright (C) 2007,2008,2009 Albert Herranz
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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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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/irq.h>
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#include <linux/kexec.h>
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#include <linux/seq_file.h>
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#include <linux/of_platform.h>
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#include <asm/io.h>
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#include <asm/machdep.h>
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#include <asm/prom.h>
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#include <asm/time.h>
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#include <asm/udbg.h>
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#include "flipper-pic.h"
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#include "usbgecko_udbg.h"
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static void gamecube_spin(void)
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{
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/* spin until power button pressed */
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for (;;)
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cpu_relax();
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}
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static void gamecube_restart(char *cmd)
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{
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local_irq_disable();
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flipper_platform_reset();
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gamecube_spin();
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}
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static void gamecube_power_off(void)
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{
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local_irq_disable();
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gamecube_spin();
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}
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static void gamecube_halt(void)
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{
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gamecube_restart(NULL);
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}
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static void __init gamecube_init_early(void)
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{
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ug_udbg_init();
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}
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static int __init gamecube_probe(void)
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{
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unsigned long dt_root;
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dt_root = of_get_flat_dt_root();
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if (!of_flat_dt_is_compatible(dt_root, "nintendo,gamecube"))
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return 0;
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pm_power_off = gamecube_power_off;
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return 1;
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}
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static void gamecube_shutdown(void)
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{
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flipper_quiesce();
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}
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define_machine(gamecube) {
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.name = "gamecube",
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.probe = gamecube_probe,
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.init_early = gamecube_init_early,
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.restart = gamecube_restart,
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.halt = gamecube_halt,
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.init_IRQ = flipper_pic_probe,
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.get_irq = flipper_pic_get_irq,
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.calibrate_decr = generic_calibrate_decr,
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.progress = udbg_progress,
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.machine_shutdown = gamecube_shutdown,
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};
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static const struct of_device_id gamecube_of_bus[] = {
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{ .compatible = "nintendo,flipper", },
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{ },
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};
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static int __init gamecube_device_probe(void)
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{
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if (!machine_is(gamecube))
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return 0;
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of_platform_bus_probe(NULL, gamecube_of_bus, NULL);
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return 0;
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}
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device_initcall(gamecube_device_probe);
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