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/*
* Support for OLPC XO-1 System Control Interrupts (SCI)
*
* 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/cs5535.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/mfd/core.h>
#include <linux/suspend.h>
#include <asm/io.h>
#include <asm/msr.h>
#include <asm/olpc.h>
#define DRV_NAME "olpc-xo1-sci"
#define PFX DRV_NAME ": "
static unsigned long acpi_base;
static struct input_dev *power_button_idev;
static int sci_irq;
static irqreturn_t xo1_sci_intr(int irq, void *dev_id)
{
struct platform_device *pdev = dev_id;
u32 sts;
u32 gpe;
sts = inl(acpi_base + CS5536_PM1_STS);
outl(sts | 0xffff, acpi_base + CS5536_PM1_STS);
gpe = inl(acpi_base + CS5536_PM_GPE0_STS);
outl(0xffffffff, acpi_base + CS5536_PM_GPE0_STS);
dev_dbg(&pdev->dev, "sts %x gpe %x\n", sts, gpe);
if (sts & CS5536_PWRBTN_FLAG && !(sts & CS5536_WAK_FLAG)) {
input_report_key(power_button_idev, KEY_POWER, 1);
input_sync(power_button_idev);
input_report_key(power_button_idev, KEY_POWER, 0);
input_sync(power_button_idev);
}
return IRQ_HANDLED;
}
static int xo1_sci_suspend(struct platform_device *pdev, pm_message_t state)
{
if (device_may_wakeup(&power_button_idev->dev))
olpc_xo1_pm_wakeup_set(CS5536_PM_PWRBTN);
else
olpc_xo1_pm_wakeup_clear(CS5536_PM_PWRBTN);
return 0;
}
static int __devinit setup_sci_interrupt(struct platform_device *pdev)
{
u32 lo, hi;
u32 sts;
int r;
rdmsr(0x51400020, lo, hi);
sci_irq = (lo >> 20) & 15;
if (sci_irq) {
dev_info(&pdev->dev, "SCI is mapped to IRQ %d\n", sci_irq);
} else {
/* Zero means masked */
dev_info(&pdev->dev, "SCI unmapped. Mapping to IRQ 3\n");
sci_irq = 3;
lo |= 0x00300000;
wrmsrl(0x51400020, lo);
}
/* Select level triggered in PIC */
if (sci_irq < 8) {
lo = inb(CS5536_PIC_INT_SEL1);
lo |= 1 << sci_irq;
outb(lo, CS5536_PIC_INT_SEL1);
} else {
lo = inb(CS5536_PIC_INT_SEL2);
lo |= 1 << (sci_irq - 8);
outb(lo, CS5536_PIC_INT_SEL2);
}
/* Enable SCI from power button, and clear pending interrupts */
sts = inl(acpi_base + CS5536_PM1_STS);
outl((CS5536_PM_PWRBTN << 16) | 0xffff, acpi_base + CS5536_PM1_STS);
r = request_irq(sci_irq, xo1_sci_intr, 0, DRV_NAME, pdev);
if (r)
dev_err(&pdev->dev, "can't request interrupt\n");
return r;
}
static int __devinit setup_power_button(struct platform_device *pdev)
{
int r;
power_button_idev = input_allocate_device();
if (!power_button_idev)
return -ENOMEM;
power_button_idev->name = "Power Button";
power_button_idev->phys = DRV_NAME "/input0";
set_bit(EV_KEY, power_button_idev->evbit);
set_bit(KEY_POWER, power_button_idev->keybit);
power_button_idev->dev.parent = &pdev->dev;
device_init_wakeup(&power_button_idev->dev, 1);
r = input_register_device(power_button_idev);
if (r) {
dev_err(&pdev->dev, "failed to register power button: %d\n", r);
input_free_device(power_button_idev);
}
return r;
}
static void free_power_button(void)
{
input_unregister_device(power_button_idev);
input_free_device(power_button_idev);
}
static int __devinit xo1_sci_probe(struct platform_device *pdev)
{
struct resource *res;
int r;
/* don't run on non-XOs */
if (!machine_is_olpc())
return -ENODEV;
r = mfd_cell_enable(pdev);
if (r)
return r;
res = platform_get_resource(pdev, IORESOURCE_IO, 0);
if (!res) {
dev_err(&pdev->dev, "can't fetch device resource info\n");
return -EIO;
}
acpi_base = res->start;
r = setup_power_button(pdev);
if (r)
return r;
r = setup_sci_interrupt(pdev);
if (r)
free_power_button();
return r;
}
static int __devexit xo1_sci_remove(struct platform_device *pdev)
{
mfd_cell_disable(pdev);
free_irq(sci_irq, pdev);
free_power_button();
acpi_base = 0;
return 0;
}
static struct platform_driver xo1_sci_driver = {
.driver = {
.name = "olpc-xo1-sci-acpi",
},
.probe = xo1_sci_probe,
.remove = __devexit_p(xo1_sci_remove),
.suspend = xo1_sci_suspend,
};
static int __init xo1_sci_init(void)
{
return platform_driver_register(&xo1_sci_driver);
}
arch_initcall(xo1_sci_init);
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