1/*
2 *  Driver for TANBAC TB0219 base board.
3 *
4 *  Copyright (C) 2005  Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
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 as published by
8 *  the Free Software Foundation; either version 2 of the License, or
9 *  (at your option) any later version.
10 *
11 *  This program is distributed in the hope that it will be useful,
12 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
13 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 *  GNU General Public License for more details.
15 *
16 *  You should have received a copy of the GNU General Public License
17 *  along with this program; if not, write to the Free Software
18 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
19 */
20#include <linux/platform_device.h>
21#include <linux/fs.h>
22#include <linux/init.h>
23#include <linux/module.h>
24
25#include <asm/io.h>
26#include <asm/reboot.h>
27#include <asm/vr41xx/giu.h>
28#include <asm/vr41xx/tb0219.h>
29
30MODULE_AUTHOR("Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>");
31MODULE_DESCRIPTION("TANBAC TB0219 base board driver");
32MODULE_LICENSE("GPL");
33
34static int major;	/* default is dynamic major device number */
35module_param(major, int, 0);
36MODULE_PARM_DESC(major, "Major device number");
37
38static void (*old_machine_restart)(char *command);
39static void __iomem *tb0219_base;
40static spinlock_t tb0219_lock;
41
42#define tb0219_read(offset)		readw(tb0219_base + (offset))
43#define tb0219_write(offset, value)	writew((value), tb0219_base + (offset))
44
45#define TB0219_START	0x0a000000UL
46#define TB0219_SIZE	0x20UL
47
48#define TB0219_LED			0x00
49#define TB0219_GPIO_INPUT		0x02
50#define TB0219_GPIO_OUTPUT		0x04
51#define TB0219_DIP_SWITCH		0x06
52#define TB0219_MISC			0x08
53#define TB0219_RESET			0x0e
54#define TB0219_PCI_SLOT1_IRQ_STATUS	0x10
55#define TB0219_PCI_SLOT2_IRQ_STATUS	0x12
56#define TB0219_PCI_SLOT3_IRQ_STATUS	0x14
57
58typedef enum {
59	TYPE_LED,
60	TYPE_GPIO_OUTPUT,
61} tb0219_type_t;
62
63/*
64 * Minor device number
65 *	 0 = 7 segment LED
66 *
67 *	16 = GPIO IN 0
68 *	17 = GPIO IN 1
69 *	18 = GPIO IN 2
70 *	19 = GPIO IN 3
71 *	20 = GPIO IN 4
72 *	21 = GPIO IN 5
73 *	22 = GPIO IN 6
74 *	23 = GPIO IN 7
75 *
76 *	32 = GPIO OUT 0
77 *	33 = GPIO OUT 1
78 *	34 = GPIO OUT 2
79 *	35 = GPIO OUT 3
80 *	36 = GPIO OUT 4
81 *	37 = GPIO OUT 5
82 *	38 = GPIO OUT 6
83 *	39 = GPIO OUT 7
84 *
85 *	48 = DIP switch 1
86 *	49 = DIP switch 2
87 *	50 = DIP switch 3
88 *	51 = DIP switch 4
89 *	52 = DIP switch 5
90 *	53 = DIP switch 6
91 *	54 = DIP switch 7
92 *	55 = DIP switch 8
93 */
94
95static inline char get_led(void)
96{
97	return (char)tb0219_read(TB0219_LED);
98}
99
100static inline char get_gpio_input_pin(unsigned int pin)
101{
102	uint16_t values;
103
104	values = tb0219_read(TB0219_GPIO_INPUT);
105	if (values & (1 << pin))
106		return '1';
107
108	return '0';
109}
110
111static inline char get_gpio_output_pin(unsigned int pin)
112{
113	uint16_t values;
114
115	values = tb0219_read(TB0219_GPIO_OUTPUT);
116	if (values & (1 << pin))
117		return '1';
118
119	return '0';
120}
121
122static inline char get_dip_switch(unsigned int pin)
123{
124	uint16_t values;
125
126	values = tb0219_read(TB0219_DIP_SWITCH);
127	if (values & (1 << pin))
128		return '1';
129
130	return '0';
131}
132
133static inline int set_led(char command)
134{
135	tb0219_write(TB0219_LED, command);
136
137	return 0;
138}
139
140static inline int set_gpio_output_pin(unsigned int pin, char command)
141{
142	unsigned long flags;
143	uint16_t value;
144
145	if (command != '0' && command != '1')
146		return -EINVAL;
147
148	spin_lock_irqsave(&tb0219_lock, flags);
149	value = tb0219_read(TB0219_GPIO_OUTPUT);
150	if (command == '0')
151		value &= ~(1 << pin);
152	else
153		value |= 1 << pin;
154	tb0219_write(TB0219_GPIO_OUTPUT, value);
155	spin_unlock_irqrestore(&tb0219_lock, flags);
156
157	return 0;
158
159}
160
161static ssize_t tanbac_tb0219_read(struct file *file, char __user *buf, size_t len,
162                                  loff_t *ppos)
163{
164	unsigned int minor;
165	char value;
166
167	minor = iminor(file->f_path.dentry->d_inode);
168	switch (minor) {
169	case 0:
170		value = get_led();
171		break;
172	case 16 ... 23:
173		value = get_gpio_input_pin(minor - 16);
174		break;
175	case 32 ... 39:
176		value = get_gpio_output_pin(minor - 32);
177		break;
178	case 48 ... 55:
179		value = get_dip_switch(minor - 48);
180		break;
181	default:
182		return -EBADF;
183	}
184
185	if (len <= 0)
186		return -EFAULT;
187
188	if (put_user(value, buf))
189		return -EFAULT;
190
191	return 1;
192}
193
194static ssize_t tanbac_tb0219_write(struct file *file, const char __user *data,
195                                   size_t len, loff_t *ppos)
196{
197	unsigned int minor;
198	tb0219_type_t type;
199	size_t i;
200	int retval = 0;
201	char c;
202
203	minor = iminor(file->f_path.dentry->d_inode);
204	switch (minor) {
205	case 0:
206		type = TYPE_LED;
207		break;
208	case 32 ... 39:
209		type = TYPE_GPIO_OUTPUT;
210		break;
211	default:
212		return -EBADF;
213	}
214
215	for (i = 0; i < len; i++) {
216		if (get_user(c, data + i))
217			return -EFAULT;
218
219		switch (type) {
220		case TYPE_LED:
221			retval = set_led(c);
222			break;
223		case TYPE_GPIO_OUTPUT:
224			retval = set_gpio_output_pin(minor - 32, c);
225			break;
226		}
227
228		if (retval < 0)
229			break;
230	}
231
232	return i;
233}
234
235static int tanbac_tb0219_open(struct inode *inode, struct file *file)
236{
237	unsigned int minor;
238
239	minor = iminor(inode);
240	switch (minor) {
241	case 0:
242	case 16 ... 23:
243	case 32 ... 39:
244	case 48 ... 55:
245		return nonseekable_open(inode, file);
246	default:
247		break;
248	}
249
250	return -EBADF;
251}
252
253static int tanbac_tb0219_release(struct inode *inode, struct file *file)
254{
255	return 0;
256}
257
258static const struct file_operations tb0219_fops = {
259	.owner		= THIS_MODULE,
260	.read		= tanbac_tb0219_read,
261	.write		= tanbac_tb0219_write,
262	.open		= tanbac_tb0219_open,
263	.release	= tanbac_tb0219_release,
264};
265
266static void tb0219_restart(char *command)
267{
268	tb0219_write(TB0219_RESET, 0);
269}
270
271static void tb0219_pci_irq_init(void)
272{
273	/* PCI Slot 1 */
274	vr41xx_set_irq_trigger(TB0219_PCI_SLOT1_PIN, IRQ_TRIGGER_LEVEL, IRQ_SIGNAL_THROUGH);
275	vr41xx_set_irq_level(TB0219_PCI_SLOT1_PIN, IRQ_LEVEL_LOW);
276
277	/* PCI Slot 2 */
278	vr41xx_set_irq_trigger(TB0219_PCI_SLOT2_PIN, IRQ_TRIGGER_LEVEL, IRQ_SIGNAL_THROUGH);
279	vr41xx_set_irq_level(TB0219_PCI_SLOT2_PIN, IRQ_LEVEL_LOW);
280
281	/* PCI Slot 3 */
282	vr41xx_set_irq_trigger(TB0219_PCI_SLOT3_PIN, IRQ_TRIGGER_LEVEL, IRQ_SIGNAL_THROUGH);
283	vr41xx_set_irq_level(TB0219_PCI_SLOT3_PIN, IRQ_LEVEL_LOW);
284}
285
286static int __devinit tb0219_probe(struct platform_device *dev)
287{
288	int retval;
289
290	if (request_mem_region(TB0219_START, TB0219_SIZE, "TB0219") == NULL)
291		return -EBUSY;
292
293	tb0219_base = ioremap(TB0219_START, TB0219_SIZE);
294	if (tb0219_base == NULL) {
295		release_mem_region(TB0219_START, TB0219_SIZE);
296		return -ENOMEM;
297	}
298
299	retval = register_chrdev(major, "TB0219", &tb0219_fops);
300	if (retval < 0) {
301		iounmap(tb0219_base);
302		tb0219_base = NULL;
303		release_mem_region(TB0219_START, TB0219_SIZE);
304		return retval;
305	}
306
307	spin_lock_init(&tb0219_lock);
308
309	old_machine_restart = _machine_restart;
310	_machine_restart = tb0219_restart;
311
312	tb0219_pci_irq_init();
313
314	if (major == 0) {
315		major = retval;
316		printk(KERN_INFO "TB0219: major number %d\n", major);
317	}
318
319	return 0;
320}
321
322static int __devexit tb0219_remove(struct platform_device *dev)
323{
324	_machine_restart = old_machine_restart;
325
326	iounmap(tb0219_base);
327	tb0219_base = NULL;
328
329	release_mem_region(TB0219_START, TB0219_SIZE);
330
331	return 0;
332}
333
334static struct platform_device *tb0219_platform_device;
335
336static struct platform_driver tb0219_device_driver = {
337	.probe		= tb0219_probe,
338	.remove		= __devexit_p(tb0219_remove),
339	.driver		= {
340		.name	= "TB0219",
341		.owner	= THIS_MODULE,
342	},
343};
344
345static int __init tanbac_tb0219_init(void)
346{
347	int retval;
348
349	tb0219_platform_device = platform_device_alloc("TB0219", -1);
350	if (!tb0219_platform_device)
351		return -ENOMEM;
352
353	retval = platform_device_add(tb0219_platform_device);
354	if (retval < 0) {
355		platform_device_put(tb0219_platform_device);
356		return retval;
357	}
358
359	retval = platform_driver_register(&tb0219_device_driver);
360	if (retval < 0)
361		platform_device_unregister(tb0219_platform_device);
362
363	return retval;
364}
365
366static void __exit tanbac_tb0219_exit(void)
367{
368	platform_driver_unregister(&tb0219_device_driver);
369	platform_device_unregister(tb0219_platform_device);
370}
371
372module_init(tanbac_tb0219_init);
373module_exit(tanbac_tb0219_exit);
374