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1/*
2 * SGI O2 MACE PS2 controller driver for linux
3 *
4 * Copyright (C) 2002 Vivien Chappelier
5 *
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
9 */
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>
21
22#include <asm/io.h>
23#include <asm/irq.h>
24#include <asm/ip32/mace.h>
25#include <asm/ip32/ip32_ints.h>
26
27MODULE_AUTHOR("Vivien Chappelier <vivien.chappelier@linux-mips.org");
28MODULE_DESCRIPTION("SGI O2 MACE PS2 controller driver");
29MODULE_LICENSE("GPL");
30
31#define MACE_PS2_TIMEOUT 10000 /* in 50us unit */
32
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 */
41
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 */
48
49struct maceps2_data {
50 struct mace_ps2port *port;
51 int irq;
52};
53
54static struct maceps2_data port_data[2];
55static struct serio *maceps2_port[2];
56static struct platform_device *maceps2_device;
57
58static int maceps2_write(struct serio *dev, unsigned char val)
59{
60 struct mace_ps2port *port = ((struct maceps2_data *)dev->port_data)->port;
61 unsigned int timeout = MACE_PS2_TIMEOUT;
62
63 do {
64 if (port->status & PS2_STATUS_TX_EMPTY) {
65 port->tx = val;
66 return 0;
67 }
68 udelay(50);
69 } while (timeout--);
70
71 return -1;
72}
73
74static irqreturn_t maceps2_interrupt(int irq, void *dev_id)
75{
76 struct serio *dev = dev_id;
77 struct mace_ps2port *port = ((struct maceps2_data *)dev->port_data)->port;
78 unsigned long byte;
79
80 if (port->status & PS2_STATUS_RX_FULL) {
81 byte = port->rx;
82 serio_interrupt(dev, byte & 0xff, 0);
83 }
84
85 return IRQ_HANDLED;
86}
87
88static int maceps2_open(struct serio *dev)
89{
90 struct maceps2_data *data = (struct maceps2_data *)dev->port_data;
91
92 if (request_irq(data->irq, maceps2_interrupt, 0, "PS2 port", dev)) {
93 printk(KERN_ERR "Could not allocate PS/2 IRQ\n");
94 return -EBUSY;
95 }
96
97 /* Reset port */
98 data->port->control = PS2_CONTROL_TX_CLOCK_DISABLE | PS2_CONTROL_RESET;
99 udelay(100);
100
101 /* Enable interrupts */
102 data->port->control = PS2_CONTROL_RX_CLOCK_ENABLE |
103 PS2_CONTROL_TX_ENABLE |
104 PS2_CONTROL_RX_INT_ENABLE;
105
106 return 0;
107}
108
109static void maceps2_close(struct serio *dev)
110{
111 struct maceps2_data *data = (struct maceps2_data *)dev->port_data;
112
113 data->port->control = PS2_CONTROL_TX_CLOCK_DISABLE | PS2_CONTROL_RESET;
114 udelay(100);
115 free_irq(data->irq, dev);
116}
117
118
119static struct serio *maceps2_allocate_port(int idx)
120{
121 struct serio *serio;
122
123 serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
124 if (serio) {
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;
133 }
134
135 return serio;
136}
137
138static int maceps2_probe(struct platform_device *dev)
139{
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]);
145 return -ENOMEM;
146 }
147
148 serio_register_port(maceps2_port[0]);
149 serio_register_port(maceps2_port[1]);
150
151 return 0;
152}
153
154static int maceps2_remove(struct platform_device *dev)
155{
156 serio_unregister_port(maceps2_port[0]);
157 serio_unregister_port(maceps2_port[1]);
158
159 return 0;
160}
161
162static struct platform_driver maceps2_driver = {
163 .driver = {
164 .name = "maceps2",
165 },
166 .probe = maceps2_probe,
167 .remove = maceps2_remove,
168};
169
170static int __init maceps2_init(void)
171{
172 int error;
173
174 error = platform_driver_register(&maceps2_driver);
175 if (error)
176 return error;
177
178 maceps2_device = platform_device_alloc("maceps2", -1);
179 if (!maceps2_device) {
180 error = -ENOMEM;
181 goto err_unregister_driver;
182 }
183
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;
188
189 error = platform_device_add(maceps2_device);
190 if (error)
191 goto err_free_device;
192
193 return 0;
194
195 err_free_device:
196 platform_device_put(maceps2_device);
197 err_unregister_driver:
198 platform_driver_unregister(&maceps2_driver);
199 return error;
200}
201
202static void __exit maceps2_exit(void)
203{
204 platform_device_unregister(maceps2_device);
205 platform_driver_unregister(&maceps2_driver);
206}
207
208module_init(maceps2_init);
209module_exit(maceps2_exit);
210

Warning: That file was not part of the compilation database. It may have many parsing errors.