[linux.git] / drivers / char / tb0219.c

/*
 *  Driver for TANBAC TB0219 base board.
 *
 *  Copyright (C) 2005  Yoichi Yuasa <[email protected]>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#include <linux/platform_device.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/module.h>

#include <asm/io.h>
#include <asm/reboot.h>
#include <asm/vr41xx/giu.h>
#include <asm/vr41xx/tb0219.h>

MODULE_AUTHOR("Yoichi Yuasa <[email protected]>");
MODULE_DESCRIPTION("TANBAC TB0219 base board driver");
MODULE_LICENSE("GPL");

static int major;	/* default is dynamic major device number */
module_param(major, int, 0);
MODULE_PARM_DESC(major, "Major device number");

static void (*old_machine_restart)(char *command);
static void __iomem *tb0219_base;
static DEFINE_SPINLOCK(tb0219_lock);

#define tb0219_read(offset)		readw(tb0219_base + (offset))
#define tb0219_write(offset, value)	writew((value), tb0219_base + (offset))

#define TB0219_START	0x0a000000UL
#define TB0219_SIZE	0x20UL

#define TB0219_LED			0x00
#define TB0219_GPIO_INPUT		0x02
#define TB0219_GPIO_OUTPUT		0x04
#define TB0219_DIP_SWITCH		0x06
#define TB0219_MISC			0x08
#define TB0219_RESET			0x0e
#define TB0219_PCI_SLOT1_IRQ_STATUS	0x10
#define TB0219_PCI_SLOT2_IRQ_STATUS	0x12
#define TB0219_PCI_SLOT3_IRQ_STATUS	0x14

typedef enum {
	TYPE_LED,
	TYPE_GPIO_OUTPUT,
} tb0219_type_t;

/*
 * Minor device number
 *	 0 = 7 segment LED
 *
 *	16 = GPIO IN 0
 *	17 = GPIO IN 1
 *	18 = GPIO IN 2
 *	19 = GPIO IN 3
 *	20 = GPIO IN 4
 *	21 = GPIO IN 5
 *	22 = GPIO IN 6
 *	23 = GPIO IN 7
 *
 *	32 = GPIO OUT 0
 *	33 = GPIO OUT 1
 *	34 = GPIO OUT 2
 *	35 = GPIO OUT 3
 *	36 = GPIO OUT 4
 *	37 = GPIO OUT 5
 *	38 = GPIO OUT 6
 *	39 = GPIO OUT 7
 *
 *	48 = DIP switch 1
 *	49 = DIP switch 2
 *	50 = DIP switch 3
 *	51 = DIP switch 4
 *	52 = DIP switch 5
 *	53 = DIP switch 6
 *	54 = DIP switch 7
 *	55 = DIP switch 8
 */

static inline char get_led(void)
{
	return (char)tb0219_read(TB0219_LED);
}

static inline char get_gpio_input_pin(unsigned int pin)
{
	uint16_t values;

	values = tb0219_read(TB0219_GPIO_INPUT);
	if (values & (1 << pin))
		return '1';

	return '0';
}

static inline char get_gpio_output_pin(unsigned int pin)
{
	uint16_t values;

	values = tb0219_read(TB0219_GPIO_OUTPUT);
	if (values & (1 << pin))
		return '1';

	return '0';
}

static inline char get_dip_switch(unsigned int pin)
{
	uint16_t values;

	values = tb0219_read(TB0219_DIP_SWITCH);
	if (values & (1 << pin))
		return '1';

	return '0';
}

static inline int set_led(char command)
{
	tb0219_write(TB0219_LED, command);

	return 0;
}

static inline int set_gpio_output_pin(unsigned int pin, char command)
{
	unsigned long flags;
	uint16_t value;

	if (command != '0' && command != '1')
		return -EINVAL;

	spin_lock_irqsave(&tb0219_lock, flags);
	value = tb0219_read(TB0219_GPIO_OUTPUT);
	if (command == '0')
		value &= ~(1 << pin);
	else
		value |= 1 << pin;
	tb0219_write(TB0219_GPIO_OUTPUT, value);
	spin_unlock_irqrestore(&tb0219_lock, flags);

	return 0;

}

static ssize_t tanbac_tb0219_read(struct file *file, char __user *buf, size_t len,
                                  loff_t *ppos)
{
	unsigned int minor;
	char value;

	minor = iminor(file_inode(file));
	switch (minor) {
	case 0:
		value = get_led();
		break;
	case 16 ... 23:
		value = get_gpio_input_pin(minor - 16);
		break;
	case 32 ... 39:
		value = get_gpio_output_pin(minor - 32);
		break;
	case 48 ... 55:
		value = get_dip_switch(minor - 48);
		break;
	default:
		return -EBADF;
	}

	if (len <= 0)
		return -EFAULT;

	if (put_user(value, buf))
		return -EFAULT;

	return 1;
}

static ssize_t tanbac_tb0219_write(struct file *file, const char __user *data,
                                   size_t len, loff_t *ppos)
{
	unsigned int minor;
	tb0219_type_t type;
	size_t i;
	int retval = 0;
	char c;

	minor = iminor(file_inode(file));
	switch (minor) {
	case 0:
		type = TYPE_LED;
		break;
	case 32 ... 39:
		type = TYPE_GPIO_OUTPUT;
		break;
	default:
		return -EBADF;
	}

	for (i = 0; i < len; i++) {
		if (get_user(c, data + i))
			return -EFAULT;

		switch (type) {
		case TYPE_LED:
			retval = set_led(c);
			break;
		case TYPE_GPIO_OUTPUT:
			retval = set_gpio_output_pin(minor - 32, c);
			break;
		}

		if (retval < 0)
			break;
	}

	return i;
}

static int tanbac_tb0219_open(struct inode *inode, struct file *file)
{
	unsigned int minor;

	minor = iminor(inode);
	switch (minor) {
	case 0:
	case 16 ... 23:
	case 32 ... 39:
	case 48 ... 55:
		return nonseekable_open(inode, file);
	default:
		break;
	}

	return -EBADF;
}

static int tanbac_tb0219_release(struct inode *inode, struct file *file)
{
	return 0;
}

static const struct file_operations tb0219_fops = {
	.owner		= THIS_MODULE,
	.read		= tanbac_tb0219_read,
	.write		= tanbac_tb0219_write,
	.open		= tanbac_tb0219_open,
	.release	= tanbac_tb0219_release,
	.llseek		= no_llseek,
};

static void tb0219_restart(char *command)
{
	tb0219_write(TB0219_RESET, 0);
}

static void tb0219_pci_irq_init(void)
{
	/* PCI Slot 1 */
	vr41xx_set_irq_trigger(TB0219_PCI_SLOT1_PIN, IRQ_TRIGGER_LEVEL, IRQ_SIGNAL_THROUGH);
	vr41xx_set_irq_level(TB0219_PCI_SLOT1_PIN, IRQ_LEVEL_LOW);

	/* PCI Slot 2 */
	vr41xx_set_irq_trigger(TB0219_PCI_SLOT2_PIN, IRQ_TRIGGER_LEVEL, IRQ_SIGNAL_THROUGH);
	vr41xx_set_irq_level(TB0219_PCI_SLOT2_PIN, IRQ_LEVEL_LOW);

	/* PCI Slot 3 */
	vr41xx_set_irq_trigger(TB0219_PCI_SLOT3_PIN, IRQ_TRIGGER_LEVEL, IRQ_SIGNAL_THROUGH);
	vr41xx_set_irq_level(TB0219_PCI_SLOT3_PIN, IRQ_LEVEL_LOW);
}

static int tb0219_probe(struct platform_device *dev)
{
	int retval;

	if (request_mem_region(TB0219_START, TB0219_SIZE, "TB0219") == NULL)
		return -EBUSY;

	tb0219_base = ioremap(TB0219_START, TB0219_SIZE);
	if (tb0219_base == NULL) {
		release_mem_region(TB0219_START, TB0219_SIZE);
		return -ENOMEM;
	}

	retval = register_chrdev(major, "TB0219", &tb0219_fops);
	if (retval < 0) {
		iounmap(tb0219_base);
		tb0219_base = NULL;
		release_mem_region(TB0219_START, TB0219_SIZE);
		return retval;
	}

	old_machine_restart = _machine_restart;
	_machine_restart = tb0219_restart;

	tb0219_pci_irq_init();

	if (major == 0) {
		major = retval;
		printk(KERN_INFO "TB0219: major number %d\n", major);
	}

	return 0;
}

static int tb0219_remove(struct platform_device *dev)
{
	_machine_restart = old_machine_restart;

	iounmap(tb0219_base);
	tb0219_base = NULL;

	release_mem_region(TB0219_START, TB0219_SIZE);

	return 0;
}

static struct platform_device *tb0219_platform_device;

static struct platform_driver tb0219_device_driver = {
	.probe		= tb0219_probe,
	.remove		= tb0219_remove,
	.driver		= {
		.name	= "TB0219",
		.owner	= THIS_MODULE,
	},
};

static int __init tanbac_tb0219_init(void)
{
	int retval;

	tb0219_platform_device = platform_device_alloc("TB0219", -1);
	if (!tb0219_platform_device)
		return -ENOMEM;

	retval = platform_device_add(tb0219_platform_device);
	if (retval < 0) {
		platform_device_put(tb0219_platform_device);
		return retval;
	}

	retval = platform_driver_register(&tb0219_device_driver);
	if (retval < 0)
		platform_device_unregister(tb0219_platform_device);

	return retval;
}

static void __exit tanbac_tb0219_exit(void)
{
	platform_driver_unregister(&tb0219_device_driver);
	platform_device_unregister(tb0219_platform_device);
}

module_init(tanbac_tb0219_init);
module_exit(tanbac_tb0219_exit);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Driver for TANBAC TB0219 base board.
	3	*
ada8e951	4	* Copyright (C) 2005 Yoichi Yuasa <[email protected]>
1da177e4 LT	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	*/
d052d1be	20	#include <linux/platform_device.h>
1da177e4 LT	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>
6e498c10 YY	27	#include <asm/vr41xx/giu.h>
6e498c10 YY	28	#include <asm/vr41xx/tb0219.h>
1da177e4	29
ada8e951	30	MODULE_AUTHOR("Yoichi Yuasa <[email protected]>");
1da177e4 LT	31	MODULE_DESCRIPTION("TANBAC TB0219 base board driver");
	32	MODULE_LICENSE("GPL");
	33
	34	static int major; /* default is dynamic major device number */
	35	module_param(major, int, 0);
	36	MODULE_PARM_DESC(major, "Major device number");
	37
	38	static void (old_machine_restart)(char command);
	39	static void __iomem *tb0219_base;
d2a7be0b	40	static DEFINE_SPINLOCK(tb0219_lock);
1da177e4 LT	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
	58	typedef 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
	95	static inline char get_led(void)
	96	{
	97	return (char)tb0219_read(TB0219_LED);
	98	}
	99
	100	static 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
111	static 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
122	static 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
133	static inline int set_led(char command)
134	{
135	tb0219_write(TB0219_LED, command);
136
137	return 0;
138	}
139
140	static 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
161	static 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
496ad9aa	167	minor = iminor(file_inode(file));
1da177e4 LT	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
	194	static 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
496ad9aa	203	minor = iminor(file_inode(file));
1da177e4 LT	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
	235	static 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
	253	static int tanbac_tb0219_release(struct inode inode, struct file file)
	254	{
	255	return 0;
	256	}
	257
62322d25	258	static const struct file_operations tb0219_fops = {
1da177e4 LT	259	.owner = THIS_MODULE,
	260	.read = tanbac_tb0219_read,
	261	.write = tanbac_tb0219_write,
	262	.open = tanbac_tb0219_open,
	263	.release = tanbac_tb0219_release,
6038f373	264	.llseek = no_llseek,
1da177e4 LT	265	};
	266
	267	static void tb0219_restart(char *command)
	268	{
	269	tb0219_write(TB0219_RESET, 0);
	270	}
	271
6e498c10 YY	272	static void tb0219_pci_irq_init(void)
	273	{
	274	/* PCI Slot 1 */
	275	vr41xx_set_irq_trigger(TB0219_PCI_SLOT1_PIN, IRQ_TRIGGER_LEVEL, IRQ_SIGNAL_THROUGH);
	276	vr41xx_set_irq_level(TB0219_PCI_SLOT1_PIN, IRQ_LEVEL_LOW);
	277
	278	/* PCI Slot 2 */
	279	vr41xx_set_irq_trigger(TB0219_PCI_SLOT2_PIN, IRQ_TRIGGER_LEVEL, IRQ_SIGNAL_THROUGH);
	280	vr41xx_set_irq_level(TB0219_PCI_SLOT2_PIN, IRQ_LEVEL_LOW);
	281
	282	/* PCI Slot 3 */
	283	vr41xx_set_irq_trigger(TB0219_PCI_SLOT3_PIN, IRQ_TRIGGER_LEVEL, IRQ_SIGNAL_THROUGH);
	284	vr41xx_set_irq_level(TB0219_PCI_SLOT3_PIN, IRQ_LEVEL_LOW);
	285	}
	286
2223cbec	287	static int tb0219_probe(struct platform_device *dev)
1da177e4 LT	288	{
	289	int retval;
	290
	291	if (request_mem_region(TB0219_START, TB0219_SIZE, "TB0219") == NULL)
	292	return -EBUSY;
	293
	294	tb0219_base = ioremap(TB0219_START, TB0219_SIZE);
	295	if (tb0219_base == NULL) {
	296	release_mem_region(TB0219_START, TB0219_SIZE);
	297	return -ENOMEM;
	298	}
	299
	300	retval = register_chrdev(major, "TB0219", &tb0219_fops);
	301	if (retval < 0) {
	302	iounmap(tb0219_base);
	303	tb0219_base = NULL;
	304	release_mem_region(TB0219_START, TB0219_SIZE);
	305	return retval;
	306	}
	307
1da177e4 LT	308	old_machine_restart = _machine_restart;
	309	_machine_restart = tb0219_restart;
	310
6e498c10 YY	311	tb0219_pci_irq_init();
6e498c10 YY	312
1da177e4 LT	313	if (major == 0) {
	314	major = retval;
	315	printk(KERN_INFO "TB0219: major number %d\n", major);
	316	}
	317
	318	return 0;
	319	}
	320
39af33fc	321	static int tb0219_remove(struct platform_device *dev)
1da177e4 LT	322	{
	323	_machine_restart = old_machine_restart;
	324
	325	iounmap(tb0219_base);
	326	tb0219_base = NULL;
	327
	328	release_mem_region(TB0219_START, TB0219_SIZE);
	329
	330	return 0;
	331	}
	332
	333	static struct platform_device *tb0219_platform_device;
	334
3ae5eaec	335	static struct platform_driver tb0219_device_driver = {
1da177e4	336	.probe = tb0219_probe,
4dde2d2f	337	.remove = tb0219_remove,
3ae5eaec RK	338	.driver = {
3ae5eaec RK	339	.name = "TB0219",
d0497614	340	.owner = THIS_MODULE,
3ae5eaec	341	},
1da177e4 LT	342	};
1da177e4 LT	343
d0497614	344	static int __init tanbac_tb0219_init(void)
1da177e4 LT	345	{
	346	int retval;
	347
d0497614 DT	348	tb0219_platform_device = platform_device_alloc("TB0219", -1);
	349	if (!tb0219_platform_device)
	350	return -ENOMEM;
	351
	352	retval = platform_device_add(tb0219_platform_device);
	353	if (retval < 0) {
	354	platform_device_put(tb0219_platform_device);
	355	return retval;
	356	}
1da177e4	357
3ae5eaec	358	retval = platform_driver_register(&tb0219_device_driver);
1da177e4 LT	359	if (retval < 0)
	360	platform_device_unregister(tb0219_platform_device);
	361
	362	return retval;
	363	}
	364
d0497614	365	static void __exit tanbac_tb0219_exit(void)
1da177e4	366	{
3ae5eaec	367	platform_driver_unregister(&tb0219_device_driver);
1da177e4 LT	368	platform_device_unregister(tb0219_platform_device);
	369	}
	370
	371	module_init(tanbac_tb0219_init);
	372	module_exit(tanbac_tb0219_exit);