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// SPDX-License-Identifier: GPL-2.0-only
/*
* Altera University Program PS2 controller driver
*
* Copyright (C) 2008 Thomas Chou <thomas@wytron.com.tw>
*
* Based on sa1111ps2.c, which is:
* Copyright (C) 2002 Russell King
*/
#include <linux/module.h>
#include <linux/input.h>
#include <linux/serio.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/of.h>
#define DRV_NAME "altera_ps2"
struct ps2if {
struct serio *io;
void __iomem *base;
};
/*
* Read all bytes waiting in the PS2 port. There should be
* at the most one, but we loop for safety.
*/
static irqreturn_t altera_ps2_rxint(int irq, void *dev_id)
{
struct ps2if *ps2if = dev_id;
unsigned int status;
irqreturn_t handled = IRQ_NONE;
while ((status = readl(ps2if->base)) & 0xffff0000) {
serio_interrupt(ps2if->io, status & 0xff, 0);
handled = IRQ_HANDLED;
}
return handled;
}
/*
* Write a byte to the PS2 port.
*/
static int altera_ps2_write(struct serio *io, unsigned char val)
{
struct ps2if *ps2if = io->port_data;
writel(val, ps2if->base);
return 0;
}
static int altera_ps2_open(struct serio *io)
{
struct ps2if *ps2if = io->port_data;
/* clear fifo */
while (readl(ps2if->base) & 0xffff0000)
/* empty */;
writel(1, ps2if->base + 4); /* enable rx irq */
return 0;
}
static void altera_ps2_close(struct serio *io)
{
struct ps2if *ps2if = io->port_data;
writel(0, ps2if->base + 4); /* disable rx irq */
}
/*
* Add one device to this driver.
*/
static int altera_ps2_probe(struct platform_device *pdev)
{
struct ps2if *ps2if;
struct serio *serio;
int error, irq;
ps2if = devm_kzalloc(&pdev->dev, sizeof(struct ps2if), GFP_KERNEL);
if (!ps2if)
return -ENOMEM;
ps2if->base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
if (IS_ERR(ps2if->base))
return PTR_ERR(ps2if->base);
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return -ENXIO;
error = devm_request_irq(&pdev->dev, irq, altera_ps2_rxint, 0,
pdev->name, ps2if);
if (error) {
dev_err(&pdev->dev, "could not request IRQ %d\n", irq);
return error;
}
serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
if (!serio)
return -ENOMEM;
serio->id.type = SERIO_8042;
serio->write = altera_ps2_write;
serio->open = altera_ps2_open;
serio->close = altera_ps2_close;
strscpy(serio->name, dev_name(&pdev->dev), sizeof(serio->name));
strscpy(serio->phys, dev_name(&pdev->dev), sizeof(serio->phys));
serio->port_data = ps2if;
serio->dev.parent = &pdev->dev;
ps2if->io = serio;
dev_info(&pdev->dev, "base %p, irq %d\n", ps2if->base, irq);
serio_register_port(ps2if->io);
platform_set_drvdata(pdev, ps2if);
return 0;
}
/*
* Remove one device from this driver.
*/
static int altera_ps2_remove(struct platform_device *pdev)
{
struct ps2if *ps2if = platform_get_drvdata(pdev);
serio_unregister_port(ps2if->io);
return 0;
}
#ifdef CONFIG_OF
static const struct of_device_id altera_ps2_match[] = {
{ .compatible = "ALTR,ps2-1.0", },
{ .compatible = "altr,ps2-1.0", },
{},
};
MODULE_DEVICE_TABLE(of, altera_ps2_match);
#endif /* CONFIG_OF */
/*
* Our device driver structure
*/
static struct platform_driver altera_ps2_driver = {
.probe = altera_ps2_probe,
.remove = altera_ps2_remove,
.driver = {
.name = DRV_NAME,
.of_match_table = of_match_ptr(altera_ps2_match),
},
};
module_platform_driver(altera_ps2_driver);
MODULE_DESCRIPTION("Altera University Program PS2 controller driver");
MODULE_AUTHOR("Thomas Chou <thomas@wytron.com.tw>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRV_NAME);
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