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/*
* Support for features of the OLPC XO-1 laptop
*
* Copyright (C) 2010 Andres Salomon <dilinger@queued.net>
* 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/platform_device.h>
#include <linux/pm.h>
#include <asm/io.h>
#include <asm/olpc.h>
#define DRV_NAME "olpc-xo1"
/* 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);
}
static int __devinit olpc_xo1_probe(struct platform_device *pdev)
{
struct resource *res;
/* don't run on non-XOs */
if (!machine_is_olpc())
return -ENODEV;
res = platform_get_resource(pdev, IORESOURCE_IO, 0);
if (!res) {
dev_err(&pdev->dev, "can't fetch device resource info\n");
return -EIO;
}
if (!request_region(res->start, resource_size(res), DRV_NAME)) {
dev_err(&pdev->dev, "can't request region\n");
return -EIO;
}
if (strcmp(pdev->name, "cs5535-pms") == 0)
pms_base = res->start;
else if (strcmp(pdev->name, "cs5535-acpi") == 0)
acpi_base = res->start;
/* If we have both addresses, we can override the poweroff hook */
if (pms_base && acpi_base) {
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)
{
struct resource *r;
r = platform_get_resource(pdev, IORESOURCE_IO, 0);
release_region(r->start, resource_size(r));
if (strcmp(pdev->name, "cs5535-pms") == 0)
pms_base = 0;
else if (strcmp(pdev->name, "cs5535-acpi") == 0)
acpi_base = 0;
pm_power_off = NULL;
return 0;
}
static struct platform_driver cs5535_pms_drv = {
.driver = {
.name = "cs5535-pms",
.owner = THIS_MODULE,
},
.probe = olpc_xo1_probe,
.remove = __devexit_p(olpc_xo1_remove),
};
static struct platform_driver cs5535_acpi_drv = {
.driver = {
.name = "cs5535-acpi",
.owner = THIS_MODULE,
},
.probe = olpc_xo1_probe,
.remove = __devexit_p(olpc_xo1_remove),
};
static int __init olpc_xo1_init(void)
{
int r;
r = platform_driver_register(&cs5535_pms_drv);
if (r)
return r;
r = platform_driver_register(&cs5535_acpi_drv);
if (r)
platform_driver_unregister(&cs5535_pms_drv);
return r;
}
static void __exit olpc_xo1_exit(void)
{
platform_driver_unregister(&cs5535_acpi_drv);
platform_driver_unregister(&cs5535_pms_drv);
}
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);
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