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Commit bf1ebf00 authored by Daniel Drake's avatar Daniel Drake Committed by H. Peter Anvin
Browse files

x86, olpc: Add XO-1 poweroff support 



Add a pm_power_off handler for the OLPC XO-1 laptop.

The driver can be built modular and follows the behaviour of the
APM driver, setting pm_power_off to NULL on unload. However, the
ability to unload the module will probably be removed (with a simple
__module_get(THIS_MODULE)) if/when XO-1 suspend/resume support is
added to this file at a later date.

Signed-off-by: default avatarDaniel Drake <dsd@laptop.org>
LKML-Reference: <20101010094032.9AE669D401B@zog.reactivated.net>
Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
parent 286e5b97

arch/x86/Kconfig

+6 −0
Original line number Diff line number Diff line
@@ -2066,6 +2066,12 @@ config OLPC 
	  Add support for detecting the unique features of the OLPC

	  XO hardware.



config OLPC_XO1

	tristate "OLPC XO-1 support"

	depends on OLPC

	---help---

	  Add support for non-essential features of the OLPC XO-1 laptop.



config OLPC_OPENFIRMWARE

	bool "Support for OLPC's Open Firmware"

	depends on !X86_64 && !X86_PAE

arch/x86/kernel/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -104,6 +104,7 @@ obj-$(CONFIG_SCx200) += scx200.o 
scx200-y			+= scx200_32.o



obj-$(CONFIG_OLPC)		+= olpc.o

obj-$(CONFIG_OLPC_XO1)		+= olpc-xo1.o

obj-$(CONFIG_OLPC_OPENFIRMWARE)	+= olpc_ofw.o

obj-$(CONFIG_X86_MRST)		+= mrst.o

arch/x86/kernel/olpc-xo1.c

0 → 100644
+140 −0
Original line number Diff line number Diff line 
/*

 * Support for features of the OLPC XO-1 laptop

 *

 * Copyright (C) 2010 One Laptop per Child

 * Copyright (C) 2006 Red Hat, Inc.

 * Copyright (C) 2006 Advanced Micro Devices, Inc.

 *

 * 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/module.h>

#include <linux/pci.h>

#include <linux/pci_ids.h>

#include <linux/platform_device.h>

#include <linux/pm.h>



#include <asm/io.h>

#include <asm/olpc.h>



#define DRV_NAME "olpc-xo1"



#define PMS_BAR		4

#define ACPI_BAR	5



/* PMC registers (PMS block) */

#define PM_SCLK		0x10

#define PM_IN_SLPCTL	0x20

#define PM_WKXD		0x34

#define PM_WKD		0x30

#define PM_SSC		0x54



/* PM registers (ACPI block) */

#define PM1_CNT		0x08

#define PM_GPE0_STS	0x18



static unsigned long acpi_base;

static unsigned long pms_base;



static void xo1_power_off(void)

{

	printk(KERN_INFO "OLPC XO-1 power off sequence...\n");



	/* Enable all of these controls with 0 delay */

	outl(0x40000000, pms_base + PM_SCLK);

	outl(0x40000000, pms_base + PM_IN_SLPCTL);

	outl(0x40000000, pms_base + PM_WKXD);

	outl(0x40000000, pms_base + PM_WKD);



	/* Clear status bits (possibly unnecessary) */

	outl(0x0002ffff, pms_base  + PM_SSC);

	outl(0xffffffff, acpi_base + PM_GPE0_STS);



	/* Write SLP_EN bit to start the machinery */

	outl(0x00002000, acpi_base + PM1_CNT);

}



/* Read the base addresses from the PCI BAR info */

static int __devinit setup_bases(struct pci_dev *pdev)

{

	int r;



	r = pci_enable_device_io(pdev);

	if (r) {

		dev_err(&pdev->dev, "can't enable device IO\n");

		return r;

	}



	r = pci_request_region(pdev, ACPI_BAR, DRV_NAME);

	if (r) {

		dev_err(&pdev->dev, "can't alloc PCI BAR #%d\n", ACPI_BAR);

		return r;

	}



	r = pci_request_region(pdev, PMS_BAR, DRV_NAME);

	if (r) {

		dev_err(&pdev->dev, "can't alloc PCI BAR #%d\n", PMS_BAR);

		pci_release_region(pdev, ACPI_BAR);

		return r;

	}



	acpi_base = pci_resource_start(pdev, ACPI_BAR);

	pms_base = pci_resource_start(pdev, PMS_BAR);



	return 0;

}



static int __devinit olpc_xo1_probe(struct platform_device *pdev)

{

	struct pci_dev *pcidev;

	int r;



	pcidev = pci_get_device(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA,

				NULL);

	if (!pdev)

		return -ENODEV;



	r = setup_bases(pcidev);

	if (r)

		return r;



	pm_power_off = xo1_power_off;



	printk(KERN_INFO "OLPC XO-1 support registered\n");

	return 0;

}



static int __devexit olpc_xo1_remove(struct platform_device *pdev)

{

	pm_power_off = NULL;

	return 0;

}



static struct platform_driver olpc_xo1_driver = {

	.driver = {

		.name = DRV_NAME,

		.owner = THIS_MODULE,

	},

	.probe = olpc_xo1_probe,

	.remove = __devexit_p(olpc_xo1_remove),

};



static int __init olpc_xo1_init(void)

{

	return platform_driver_register(&olpc_xo1_driver);

}



static void __exit olpc_xo1_exit(void)

{

	platform_driver_unregister(&olpc_xo1_driver);

}



MODULE_AUTHOR("Daniel Drake <dsd@laptop.org>");

MODULE_LICENSE("GPL");

MODULE_ALIAS("platform:olpc-xo1");



module_init(olpc_xo1_init);

module_exit(olpc_xo1_exit);