1/*
2 * Altera University Program PS2 controller driver
3 *
4 * Copyright (C) 2008 Thomas Chou <thomas@wytron.com.tw>
5 *
6 * Based on sa1111ps2.c, which is:
7 * Copyright (C) 2002 Russell King
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14#include <linux/module.h>
15#include <linux/input.h>
16#include <linux/serio.h>
17#include <linux/interrupt.h>
18#include <linux/platform_device.h>
19#include <linux/io.h>
20#include <linux/slab.h>
21#include <linux/of.h>
22
23#define DRV_NAME "altera_ps2"
24
25struct ps2if {
26	struct serio *io;
27	void __iomem *base;
28};
29
30/*
31 * Read all bytes waiting in the PS2 port.  There should be
32 * at the most one, but we loop for safety.
33 */
34static irqreturn_t altera_ps2_rxint(int irq, void *dev_id)
35{
36	struct ps2if *ps2if = dev_id;
37	unsigned int status;
38	irqreturn_t handled = IRQ_NONE;
39
40	while ((status = readl(ps2if->base)) & 0xffff0000) {
41		serio_interrupt(ps2if->io, status & 0xff, 0);
42		handled = IRQ_HANDLED;
43	}
44
45	return handled;
46}
47
48/*
49 * Write a byte to the PS2 port.
50 */
51static int altera_ps2_write(struct serio *io, unsigned char val)
52{
53	struct ps2if *ps2if = io->port_data;
54
55	writel(val, ps2if->base);
56	return 0;
57}
58
59static int altera_ps2_open(struct serio *io)
60{
61	struct ps2if *ps2if = io->port_data;
62
63	/* clear fifo */
64	while (readl(ps2if->base) & 0xffff0000)
65		/* empty */;
66
67	writel(1, ps2if->base + 4); /* enable rx irq */
68	return 0;
69}
70
71static void altera_ps2_close(struct serio *io)
72{
73	struct ps2if *ps2if = io->port_data;
74
75	writel(0, ps2if->base + 4); /* disable rx irq */
76}
77
78/*
79 * Add one device to this driver.
80 */
81static int altera_ps2_probe(struct platform_device *pdev)
82{
83	struct ps2if *ps2if;
84	struct resource *res;
85	struct serio *serio;
86	int error, irq;
87
88	ps2if = devm_kzalloc(&pdev->dev, sizeof(struct ps2if), GFP_KERNEL);
89	if (!ps2if)
90		return -ENOMEM;
91
92	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
93	ps2if->base = devm_ioremap_resource(&pdev->dev, res);
94	if (IS_ERR(ps2if->base))
95		return PTR_ERR(ps2if->base);
96
97	irq = platform_get_irq(pdev, 0);
98	if (irq < 0)
99		return -ENXIO;
100
101	error = devm_request_irq(&pdev->dev, irq, altera_ps2_rxint, 0,
102				 pdev->name, ps2if);
103	if (error) {
104		dev_err(&pdev->dev, "could not request IRQ %d\n", irq);
105		return error;
106	}
107
108	serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
109	if (!serio)
110		return -ENOMEM;
111
112	serio->id.type		= SERIO_8042;
113	serio->write		= altera_ps2_write;
114	serio->open		= altera_ps2_open;
115	serio->close		= altera_ps2_close;
116	strlcpy(serio->name, dev_name(&pdev->dev), sizeof(serio->name));
117	strlcpy(serio->phys, dev_name(&pdev->dev), sizeof(serio->phys));
118	serio->port_data	= ps2if;
119	serio->dev.parent	= &pdev->dev;
120	ps2if->io		= serio;
121
122	dev_info(&pdev->dev, "base %p, irq %d\n", ps2if->base, irq);
123
124	serio_register_port(ps2if->io);
125	platform_set_drvdata(pdev, ps2if);
126
127	return 0;
128}
129
130/*
131 * Remove one device from this driver.
132 */
133static int altera_ps2_remove(struct platform_device *pdev)
134{
135	struct ps2if *ps2if = platform_get_drvdata(pdev);
136
137	serio_unregister_port(ps2if->io);
138
139	return 0;
140}
141
142#ifdef CONFIG_OF
143static const struct of_device_id altera_ps2_match[] = {
144	{ .compatible = "ALTR,ps2-1.0", },
145	{ .compatible = "altr,ps2-1.0", },
146	{},
147};
148MODULE_DEVICE_TABLE(of, altera_ps2_match);
149#endif /* CONFIG_OF */
150
151/*
152 * Our device driver structure
153 */
154static struct platform_driver altera_ps2_driver = {
155	.probe		= altera_ps2_probe,
156	.remove		= altera_ps2_remove,
157	.driver	= {
158		.name	= DRV_NAME,
159		.of_match_table = of_match_ptr(altera_ps2_match),
160	},
161};
162module_platform_driver(altera_ps2_driver);
163
164MODULE_DESCRIPTION("Altera University Program PS2 controller driver");
165MODULE_AUTHOR("Thomas Chou <thomas@wytron.com.tw>");
166MODULE_LICENSE("GPL");
167MODULE_ALIAS("platform:" DRV_NAME);
168