// SPDX-License-Identifier: GPL-2.0-only/* * SGI O2 MACE PS2 controller driver for linux * * Copyright (C) 2002 Vivien Chappelier */#include <linux/module.h>#include <linux/init.h>#include <linux/serio.h>#include <linux/errno.h>#include <linux/interrupt.h>#include <linux/ioport.h>#include <linux/delay.h>#include <linux/platform_device.h>#include <linux/slab.h>#include <linux/spinlock.h>#include <linux/err.h> #include <asm/io.h>#include <asm/irq.h>#include <asm/ip32/mace.h>#include <asm/ip32/ip32_ints.h> MODULE_AUTHOR("Vivien Chappelier <vivien.chappelier@linux-mips.org");MODULE_DESCRIPTION("SGI O2 MACE PS2 controller driver");MODULE_LICENSE("GPL"); #define MACE_PS2_TIMEOUT 10000 /* in 50us unit */ #define PS2_STATUS_CLOCK_SIGNAL  BIT(0) /* external clock signal */#define PS2_STATUS_CLOCK_INHIBIT BIT(1) /* clken output signal */#define PS2_STATUS_TX_INPROGRESS BIT(2) /* transmission in progress */#define PS2_STATUS_TX_EMPTY      BIT(3) /* empty transmit buffer */#define PS2_STATUS_RX_FULL       BIT(4) /* full receive buffer */#define PS2_STATUS_RX_INPROGRESS BIT(5) /* reception in progress */#define PS2_STATUS_ERROR_PARITY  BIT(6) /* parity error */#define PS2_STATUS_ERROR_FRAMING BIT(7) /* framing error */ #define PS2_CONTROL_TX_CLOCK_DISABLE BIT(0) /* inhibit clock signal after TX */#define PS2_CONTROL_TX_ENABLE        BIT(1) /* transmit enable */#define PS2_CONTROL_TX_INT_ENABLE    BIT(2) /* enable transmit interrupt */#define PS2_CONTROL_RX_INT_ENABLE    BIT(3) /* enable receive interrupt */#define PS2_CONTROL_RX_CLOCK_ENABLE  BIT(4) /* pause reception if set to 0 */#define PS2_CONTROL_RESET            BIT(5) /* reset */ struct maceps2_data {	struct mace_ps2port *port;	int irq;}; static struct maceps2_data port_data[2];static struct serio *maceps2_port[2];static struct platform_device *maceps2_device; static int maceps2_write(struct serio *dev, unsigned char val){	struct mace_ps2port *port = ((struct maceps2_data *)dev->port_data)->port;	unsigned int timeout = MACE_PS2_TIMEOUT; 	do {		if (port->status & PS2_STATUS_TX_EMPTY) {			port->tx = val;			return 0;		}		udelay(50);	} while (timeout--); 	return -1;} static irqreturn_t maceps2_interrupt(int irq, void *dev_id){	struct serio *dev = dev_id;	struct mace_ps2port *port = ((struct maceps2_data *)dev->port_data)->port;	unsigned long byte; 	if (port->status & PS2_STATUS_RX_FULL) {		byte = port->rx;		serio_interrupt(dev, byte & 0xff, 0);        } 	return IRQ_HANDLED;} static int maceps2_open(struct serio *dev){	struct maceps2_data *data = (struct maceps2_data *)dev->port_data; 	if (request_irq(data->irq, maceps2_interrupt, 0, "PS2 port", dev)) {		printk(KERN_ERR "Could not allocate PS/2 IRQ\n");		return -EBUSY;	} 	/* Reset port */	data->port->control = PS2_CONTROL_TX_CLOCK_DISABLE | PS2_CONTROL_RESET;	udelay(100);         /* Enable interrupts */	data->port->control = PS2_CONTROL_RX_CLOCK_ENABLE |			      PS2_CONTROL_TX_ENABLE |			      PS2_CONTROL_RX_INT_ENABLE; 	return 0;} static void maceps2_close(struct serio *dev){	struct maceps2_data *data = (struct maceps2_data *)dev->port_data; 	data->port->control = PS2_CONTROL_TX_CLOCK_DISABLE | PS2_CONTROL_RESET;	udelay(100);	free_irq(data->irq, dev);}  static struct serio *maceps2_allocate_port(int idx){	struct serio *serio; 	serio = kzalloc_obj(*serio);	if (serio) {		serio->id.type		= SERIO_8042;		serio->write		= maceps2_write;		serio->open		= maceps2_open;		serio->close		= maceps2_close;		snprintf(serio->name, sizeof(serio->name), "MACE PS/2 port%d", idx);		snprintf(serio->phys, sizeof(serio->phys), "mace/serio%d", idx);		serio->port_data	= &port_data[idx];		serio->dev.parent	= &maceps2_device->dev;	} 	return serio;} static int maceps2_probe(struct platform_device *dev){	maceps2_port[0] = maceps2_allocate_port(0);	maceps2_port[1] = maceps2_allocate_port(1);	if (!maceps2_port[0] || !maceps2_port[1]) {		kfree(maceps2_port[0]);		kfree(maceps2_port[1]);		return -ENOMEM;	} 	serio_register_port(maceps2_port[0]);	serio_register_port(maceps2_port[1]); 	return 0;} static void maceps2_remove(struct platform_device *dev){	serio_unregister_port(maceps2_port[0]);	serio_unregister_port(maceps2_port[1]);} static struct platform_driver maceps2_driver = {	.driver		= {		.name	= "maceps2",	},	.probe		= maceps2_probe,	.remove		= maceps2_remove,}; static int __init maceps2_init(void){	int error; 	error = platform_driver_register(&maceps2_driver);	if (error)		return error; 	maceps2_device = platform_device_alloc("maceps2", -1);	if (!maceps2_device) {		error = -ENOMEM;		goto err_unregister_driver;	} 	port_data[0].port = &mace->perif.ps2.keyb;	port_data[0].irq  = MACEISA_KEYB_IRQ;	port_data[1].port = &mace->perif.ps2.mouse;	port_data[1].irq  = MACEISA_MOUSE_IRQ; 	error = platform_device_add(maceps2_device);	if (error)		goto err_free_device; 	return 0;  err_free_device:	platform_device_put(maceps2_device); err_unregister_driver:	platform_driver_unregister(&maceps2_driver);	return error;} static void __exit maceps2_exit(void){	platform_device_unregister(maceps2_device);	platform_driver_unregister(&maceps2_driver);} module_init(maceps2_init);module_exit(maceps2_exit);