projects/linux·blob master · refs

204 lines · 5.2 KiB

1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * SGI O2 MACE PS2 controller driver for linux
4 *
5 * Copyright (C) 2002 Vivien Chappelier
6 */
7#include <linux/module.h>
8#include <linux/init.h>
9#include <linux/serio.h>
10#include <linux/errno.h>
11#include <linux/interrupt.h>
12#include <linux/ioport.h>
13#include <linux/delay.h>
14#include <linux/platform_device.h>
15#include <linux/slab.h>
16#include <linux/spinlock.h>
17#include <linux/err.h>
18
19#include <asm/io.h>
20#include <asm/irq.h>
21#include <asm/ip32/mace.h>
22#include <asm/ip32/ip32_ints.h>
23
24MODULE_AUTHOR("Vivien Chappelier <[email protected]");
25MODULE_DESCRIPTION("SGI O2 MACE PS2 controller driver");
26MODULE_LICENSE("GPL");
27
28#define MACE_PS2_TIMEOUT 10000 /* in 50us unit */
29
30#define PS2_STATUS_CLOCK_SIGNAL BIT(0) /* external clock signal */
31#define PS2_STATUS_CLOCK_INHIBIT BIT(1) /* clken output signal */
32#define PS2_STATUS_TX_INPROGRESS BIT(2) /* transmission in progress */
33#define PS2_STATUS_TX_EMPTY BIT(3) /* empty transmit buffer */
34#define PS2_STATUS_RX_FULL BIT(4) /* full receive buffer */
35#define PS2_STATUS_RX_INPROGRESS BIT(5) /* reception in progress */
36#define PS2_STATUS_ERROR_PARITY BIT(6) /* parity error */
37#define PS2_STATUS_ERROR_FRAMING BIT(7) /* framing error */
38
39#define PS2_CONTROL_TX_CLOCK_DISABLE BIT(0) /* inhibit clock signal after TX */
40#define PS2_CONTROL_TX_ENABLE BIT(1) /* transmit enable */
41#define PS2_CONTROL_TX_INT_ENABLE BIT(2) /* enable transmit interrupt */
42#define PS2_CONTROL_RX_INT_ENABLE BIT(3) /* enable receive interrupt */
43#define PS2_CONTROL_RX_CLOCK_ENABLE BIT(4) /* pause reception if set to 0 */
44#define PS2_CONTROL_RESET BIT(5) /* reset */
45
46struct maceps2_data {
47 struct mace_ps2port *port;
48 int irq;
49};
50
51static struct maceps2_data port_data[2];
52static struct serio *maceps2_port[2];
53static struct platform_device *maceps2_device;
54
55static int maceps2_write(struct serio *dev, unsigned char val)
56{
57 struct mace_ps2port *port = ((struct maceps2_data *)dev->port_data)->port;
58 unsigned int timeout = MACE_PS2_TIMEOUT;
59
60 do {
61 if (port->status & PS2_STATUS_TX_EMPTY) {
62 port->tx = val;
63 return 0;
64 }
65 udelay(50);
66 } while (timeout--);
67
68 return -1;
69}
70
71static irqreturn_t maceps2_interrupt(int irq, void *dev_id)
72{
73 struct serio *dev = dev_id;
74 struct mace_ps2port *port = ((struct maceps2_data *)dev->port_data)->port;
75 unsigned long byte;
76
77 if (port->status & PS2_STATUS_RX_FULL) {
78 byte = port->rx;
79 serio_interrupt(dev, byte & 0xff, 0);
80 }
81
82 return IRQ_HANDLED;
83}
84
85static int maceps2_open(struct serio *dev)
86{
87 struct maceps2_data *data = (struct maceps2_data *)dev->port_data;
88
89 if (request_irq(data->irq, maceps2_interrupt, 0, "PS2 port", dev)) {
90 printk(KERN_ERR "Could not allocate PS/2 IRQ\n");
91 return -EBUSY;
92 }
93
94 /* Reset port */
95 data->port->control = PS2_CONTROL_TX_CLOCK_DISABLE | PS2_CONTROL_RESET;
96 udelay(100);
97
98 /* Enable interrupts */
99 data->port->control = PS2_CONTROL_RX_CLOCK_ENABLE |
100 PS2_CONTROL_TX_ENABLE |
101 PS2_CONTROL_RX_INT_ENABLE;
102
103 return 0;
104}
105
106static void maceps2_close(struct serio *dev)
107{
108 struct maceps2_data *data = (struct maceps2_data *)dev->port_data;
109
110 data->port->control = PS2_CONTROL_TX_CLOCK_DISABLE | PS2_CONTROL_RESET;
111 udelay(100);
112 free_irq(data->irq, dev);
113}
114
115
116static struct serio *maceps2_allocate_port(int idx)
117{
118 struct serio *serio;
119
120 serio = kzalloc_obj(*serio);
121 if (serio) {
122 serio->id.type = SERIO_8042;
123 serio->write = maceps2_write;
124 serio->open = maceps2_open;
125 serio->close = maceps2_close;
126 snprintf(serio->name, sizeof(serio->name), "MACE PS/2 port%d", idx);
127 snprintf(serio->phys, sizeof(serio->phys), "mace/serio%d", idx);
128 serio->port_data = &port_data[idx];
129 serio->dev.parent = &maceps2_device->dev;
130 }
131
132 return serio;
133}
134
135static int maceps2_probe(struct platform_device *dev)
136{
137 maceps2_port[0] = maceps2_allocate_port(0);
138 maceps2_port[1] = maceps2_allocate_port(1);
139 if (!maceps2_port[0] || !maceps2_port[1]) {
140 kfree(maceps2_port[0]);
141 kfree(maceps2_port[1]);
142 return -ENOMEM;
143 }
144
145 serio_register_port(maceps2_port[0]);
146 serio_register_port(maceps2_port[1]);
147
148 return 0;
149}
150
151static void maceps2_remove(struct platform_device *dev)
152{
153 serio_unregister_port(maceps2_port[0]);
154 serio_unregister_port(maceps2_port[1]);
155}
156
157static struct platform_driver maceps2_driver = {
158 .driver = {
159 .name = "maceps2",
160 },
161 .probe = maceps2_probe,
162 .remove = maceps2_remove,
163};
164
165static int __init maceps2_init(void)
166{
167 int error;
168
169 error = platform_driver_register(&maceps2_driver);
170 if (error)
171 return error;
172
173 maceps2_device = platform_device_alloc("maceps2", -1);
174 if (!maceps2_device) {
175 error = -ENOMEM;
176 goto err_unregister_driver;
177 }
178
179 port_data[0].port = &mace->perif.ps2.keyb;
180 port_data[0].irq = MACEISA_KEYB_IRQ;
181 port_data[1].port = &mace->perif.ps2.mouse;
182 port_data[1].irq = MACEISA_MOUSE_IRQ;
183
184 error = platform_device_add(maceps2_device);
185 if (error)
186 goto err_free_device;
187
188 return 0;
189
190 err_free_device:
191 platform_device_put(maceps2_device);
192 err_unregister_driver:
193 platform_driver_unregister(&maceps2_driver);
194 return error;
195}
196
197static void __exit maceps2_exit(void)
198{
199 platform_device_unregister(maceps2_device);
200 platform_driver_unregister(&maceps2_driver);
201}
202
203module_init(maceps2_init);
204module_exit(maceps2_exit);