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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2000-2001 Vojtech Pavlik
* Copyright (c) 2002 Russell King
*/
/*
* Acorn RiscPC PS/2 keyboard controller driver for Linux/ARM
*/
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/serio.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <mach/hardware.h>
#include <asm/hardware/iomd.h>
MODULE_AUTHOR("Vojtech Pavlik, Russell King");
MODULE_DESCRIPTION("Acorn RiscPC PS/2 keyboard controller driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:kart");
struct rpckbd_data {
int tx_irq;
int rx_irq;
};
static int rpckbd_write(struct serio *port, unsigned char val)
{
while (!(iomd_readb(IOMD_KCTRL) & (1 << 7)))
cpu_relax();
iomd_writeb(val, IOMD_KARTTX);
return 0;
}
static irqreturn_t rpckbd_rx(int irq, void *dev_id)
{
struct serio *port = dev_id;
unsigned int byte;
int handled = IRQ_NONE;
while (iomd_readb(IOMD_KCTRL) & (1 << 5)) {
byte = iomd_readb(IOMD_KARTRX);
serio_interrupt(port, byte, 0);
handled = IRQ_HANDLED;
}
return handled;
}
static irqreturn_t rpckbd_tx(int irq, void *dev_id)
{
return IRQ_HANDLED;
}
static int rpckbd_open(struct serio *port)
{
struct rpckbd_data *rpckbd = port->port_data;
/* Reset the keyboard state machine. */
iomd_writeb(0, IOMD_KCTRL);
iomd_writeb(8, IOMD_KCTRL);
iomd_readb(IOMD_KARTRX);
if (request_irq(rpckbd->rx_irq, rpckbd_rx, 0, "rpckbd", port) != 0) {
printk(KERN_ERR "rpckbd.c: Could not allocate keyboard receive IRQ\n");
return -EBUSY;
}
if (request_irq(rpckbd->tx_irq, rpckbd_tx, 0, "rpckbd", port) != 0) {
printk(KERN_ERR "rpckbd.c: Could not allocate keyboard transmit IRQ\n");
free_irq(rpckbd->rx_irq, port);
return -EBUSY;
}
return 0;
}
static void rpckbd_close(struct serio *port)
{
struct rpckbd_data *rpckbd = port->port_data;
free_irq(rpckbd->rx_irq, port);
free_irq(rpckbd->tx_irq, port);
}
/*
* Allocate and initialize serio structure for subsequent registration
* with serio core.
*/
static int rpckbd_probe(struct platform_device *dev)
{
struct rpckbd_data *rpckbd;
struct serio *serio;
int tx_irq, rx_irq;
rx_irq = platform_get_irq(dev, 0);
if (rx_irq < 0)
return rx_irq;
tx_irq = platform_get_irq(dev, 1);
if (tx_irq < 0)
return tx_irq;
serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
rpckbd = kzalloc(sizeof(*rpckbd), GFP_KERNEL);
if (!serio || !rpckbd) {
kfree(rpckbd);
kfree(serio);
return -ENOMEM;
}
rpckbd->rx_irq = rx_irq;
rpckbd->tx_irq = tx_irq;
serio->id.type = SERIO_8042;
serio->write = rpckbd_write;
serio->open = rpckbd_open;
serio->close = rpckbd_close;
serio->dev.parent = &dev->dev;
serio->port_data = rpckbd;
strscpy(serio->name, "RiscPC PS/2 kbd port", sizeof(serio->name));
strscpy(serio->phys, "rpckbd/serio0", sizeof(serio->phys));
platform_set_drvdata(dev, serio);
serio_register_port(serio);
return 0;
}
static int rpckbd_remove(struct platform_device *dev)
{
struct serio *serio = platform_get_drvdata(dev);
struct rpckbd_data *rpckbd = serio->port_data;
serio_unregister_port(serio);
kfree(rpckbd);
return 0;
}
static struct platform_driver rpckbd_driver = {
.probe = rpckbd_probe,
.remove = rpckbd_remove,
.driver = {
.name = "kart",
},
};
module_platform_driver(rpckbd_driver);
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