2 * SGI O2 MACE PS2 controller driver for linux
4 * Copyright (C) 2002 Vivien Chappelier
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/serio.h>
13 #include <linux/errno.h>
14 #include <linux/interrupt.h>
15 #include <linux/ioport.h>
16 #include <linux/delay.h>
17 #include <linux/platform_device.h>
18 #include <linux/slab.h>
19 #include <linux/spinlock.h>
20 #include <linux/err.h>
24 #include <asm/ip32/mace.h>
25 #include <asm/ip32/ip32_ints.h>
27 MODULE_AUTHOR("Vivien Chappelier <vivien.chappelier@linux-mips.org");
28 MODULE_DESCRIPTION("SGI O2 MACE PS2 controller driver");
29 MODULE_LICENSE("GPL");
31 #define MACE_PS2_TIMEOUT 10000 /* in 50us unit */
33 #define PS2_STATUS_CLOCK_SIGNAL BIT(0) /* external clock signal */
34 #define PS2_STATUS_CLOCK_INHIBIT BIT(1) /* clken output signal */
35 #define PS2_STATUS_TX_INPROGRESS BIT(2) /* transmission in progress */
36 #define PS2_STATUS_TX_EMPTY BIT(3) /* empty transmit buffer */
37 #define PS2_STATUS_RX_FULL BIT(4) /* full receive buffer */
38 #define PS2_STATUS_RX_INPROGRESS BIT(5) /* reception in progress */
39 #define PS2_STATUS_ERROR_PARITY BIT(6) /* parity error */
40 #define PS2_STATUS_ERROR_FRAMING BIT(7) /* framing error */
42 #define PS2_CONTROL_TX_CLOCK_DISABLE BIT(0) /* inhibit clock signal after TX */
43 #define PS2_CONTROL_TX_ENABLE BIT(1) /* transmit enable */
44 #define PS2_CONTROL_TX_INT_ENABLE BIT(2) /* enable transmit interrupt */
45 #define PS2_CONTROL_RX_INT_ENABLE BIT(3) /* enable receive interrupt */
46 #define PS2_CONTROL_RX_CLOCK_ENABLE BIT(4) /* pause reception if set to 0 */
47 #define PS2_CONTROL_RESET BIT(5) /* reset */
50 struct mace_ps2port *port;
54 static struct maceps2_data port_data[2];
55 static struct serio *maceps2_port[2];
56 static struct platform_device *maceps2_device;
58 static int maceps2_write(struct serio *dev, unsigned char val)
60 struct mace_ps2port *port = ((struct maceps2_data *)dev->port_data)->port;
61 unsigned int timeout = MACE_PS2_TIMEOUT;
64 if (port->status & PS2_STATUS_TX_EMPTY) {
74 static irqreturn_t maceps2_interrupt(int irq, void *dev_id)
76 struct serio *dev = dev_id;
77 struct mace_ps2port *port = ((struct maceps2_data *)dev->port_data)->port;
80 if (port->status & PS2_STATUS_RX_FULL) {
82 serio_interrupt(dev, byte & 0xff, 0);
88 static int maceps2_open(struct serio *dev)
90 struct maceps2_data *data = (struct maceps2_data *)dev->port_data;
92 if (request_irq(data->irq, maceps2_interrupt, 0, "PS2 port", dev)) {
93 printk(KERN_ERR "Could not allocate PS/2 IRQ\n");
98 data->port->control = PS2_CONTROL_TX_CLOCK_DISABLE | PS2_CONTROL_RESET;
101 /* Enable interrupts */
102 data->port->control = PS2_CONTROL_RX_CLOCK_ENABLE |
103 PS2_CONTROL_TX_ENABLE |
104 PS2_CONTROL_RX_INT_ENABLE;
109 static void maceps2_close(struct serio *dev)
111 struct maceps2_data *data = (struct maceps2_data *)dev->port_data;
113 data->port->control = PS2_CONTROL_TX_CLOCK_DISABLE | PS2_CONTROL_RESET;
115 free_irq(data->irq, dev);
119 static struct serio *maceps2_allocate_port(int idx)
123 serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
125 serio->id.type = SERIO_8042;
126 serio->write = maceps2_write;
127 serio->open = maceps2_open;
128 serio->close = maceps2_close;
129 snprintf(serio->name, sizeof(serio->name), "MACE PS/2 port%d", idx);
130 snprintf(serio->phys, sizeof(serio->phys), "mace/serio%d", idx);
131 serio->port_data = &port_data[idx];
132 serio->dev.parent = &maceps2_device->dev;
138 static int maceps2_probe(struct platform_device *dev)
140 maceps2_port[0] = maceps2_allocate_port(0);
141 maceps2_port[1] = maceps2_allocate_port(1);
142 if (!maceps2_port[0] || !maceps2_port[1]) {
143 kfree(maceps2_port[0]);
144 kfree(maceps2_port[1]);
148 serio_register_port(maceps2_port[0]);
149 serio_register_port(maceps2_port[1]);
154 static int maceps2_remove(struct platform_device *dev)
156 serio_unregister_port(maceps2_port[0]);
157 serio_unregister_port(maceps2_port[1]);
162 static struct platform_driver maceps2_driver = {
166 .probe = maceps2_probe,
167 .remove = maceps2_remove,
170 static int __init maceps2_init(void)
174 error = platform_driver_register(&maceps2_driver);
178 maceps2_device = platform_device_alloc("maceps2", -1);
179 if (!maceps2_device) {
181 goto err_unregister_driver;
184 port_data[0].port = &mace->perif.ps2.keyb;
185 port_data[0].irq = MACEISA_KEYB_IRQ;
186 port_data[1].port = &mace->perif.ps2.mouse;
187 port_data[1].irq = MACEISA_MOUSE_IRQ;
189 error = platform_device_add(maceps2_device);
191 goto err_free_device;
196 platform_device_put(maceps2_device);
197 err_unregister_driver:
198 platform_driver_unregister(&maceps2_driver);
202 static void __exit maceps2_exit(void)
204 platform_device_unregister(maceps2_device);
205 platform_driver_unregister(&maceps2_driver);
208 module_init(maceps2_init);
209 module_exit(maceps2_exit);