[mirror_ubuntu-focal-kernel.git] / drivers / char / tb0219.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Driver for TANBAC TB0219 base board.
 *
 *  Copyright (C) 2005  Yoichi Yuasa <yuasa@linux-mips.org>
 */
#include <linux/platform_device.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/uaccess.h>

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

MODULE_AUTHOR("Yoichi Yuasa <yuasa@linux-mips.org>");
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 stream_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",
	},
};

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
1a59d1b8	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4 LT	2	/*
	3	* Driver for TANBAC TB0219 base board.
	4	*
ada8e951	5	* Copyright (C) 2005 Yoichi Yuasa <yuasa@linux-mips.org>
1da177e4	6	*/
d052d1be	7	#include <linux/platform_device.h>
1da177e4 LT	8	#include <linux/fs.h>
	9	#include <linux/init.h>
	10	#include <linux/module.h>
29abfbd9	11	#include <linux/uaccess.h>
1da177e4 LT	12
	13	#include <asm/io.h>
	14	#include <asm/reboot.h>
6e498c10 YY	15	#include <asm/vr41xx/giu.h>
6e498c10 YY	16	#include <asm/vr41xx/tb0219.h>
1da177e4	17
ada8e951	18	MODULE_AUTHOR("Yoichi Yuasa <yuasa@linux-mips.org>");
1da177e4 LT	19	MODULE_DESCRIPTION("TANBAC TB0219 base board driver");
	20	MODULE_LICENSE("GPL");
	21
	22	static int major; /* default is dynamic major device number */
	23	module_param(major, int, 0);
	24	MODULE_PARM_DESC(major, "Major device number");
	25
	26	static void (old_machine_restart)(char command);
	27	static void __iomem *tb0219_base;
d2a7be0b	28	static DEFINE_SPINLOCK(tb0219_lock);
1da177e4 LT	29
	30	#define tb0219_read(offset) readw(tb0219_base + (offset))
	31	#define tb0219_write(offset, value) writew((value), tb0219_base + (offset))
	32
	33	#define TB0219_START 0x0a000000UL
	34	#define TB0219_SIZE 0x20UL
	35
	36	#define TB0219_LED 0x00
	37	#define TB0219_GPIO_INPUT 0x02
	38	#define TB0219_GPIO_OUTPUT 0x04
	39	#define TB0219_DIP_SWITCH 0x06
	40	#define TB0219_MISC 0x08
	41	#define TB0219_RESET 0x0e
	42	#define TB0219_PCI_SLOT1_IRQ_STATUS 0x10
	43	#define TB0219_PCI_SLOT2_IRQ_STATUS 0x12
	44	#define TB0219_PCI_SLOT3_IRQ_STATUS 0x14
	45
	46	typedef enum {
	47	TYPE_LED,
	48	TYPE_GPIO_OUTPUT,
	49	} tb0219_type_t;
	50
	51	/*
	52	* Minor device number
	53	* 0 = 7 segment LED
	54	*
	55	* 16 = GPIO IN 0
	56	* 17 = GPIO IN 1
	57	* 18 = GPIO IN 2
	58	* 19 = GPIO IN 3
	59	* 20 = GPIO IN 4
	60	* 21 = GPIO IN 5
	61	* 22 = GPIO IN 6
	62	* 23 = GPIO IN 7
	63	*
	64	* 32 = GPIO OUT 0
	65	* 33 = GPIO OUT 1
	66	* 34 = GPIO OUT 2
	67	* 35 = GPIO OUT 3
	68	* 36 = GPIO OUT 4
	69	* 37 = GPIO OUT 5
	70	* 38 = GPIO OUT 6
	71	* 39 = GPIO OUT 7
	72	*
	73	* 48 = DIP switch 1
	74	* 49 = DIP switch 2
	75	* 50 = DIP switch 3
	76	* 51 = DIP switch 4
	77	* 52 = DIP switch 5
	78	* 53 = DIP switch 6
	79	* 54 = DIP switch 7
	80	* 55 = DIP switch 8
	81	*/
	82
	83	static inline char get_led(void)
	84	{
	85	return (char)tb0219_read(TB0219_LED);
	86	}
	87
	88	static inline char get_gpio_input_pin(unsigned int pin)
	89	{
	90	uint16_t values;
	91
	92	values = tb0219_read(TB0219_GPIO_INPUT);
93	if (values & (1 << pin))
94	return '1';
95
96	return '0';
97	}
98
99	static inline char get_gpio_output_pin(unsigned int pin)
100	{
101	uint16_t values;
102
103	values = tb0219_read(TB0219_GPIO_OUTPUT);
104	if (values & (1 << pin))
105	return '1';
106
107	return '0';
108	}
109
110	static inline char get_dip_switch(unsigned int pin)
111	{
112	uint16_t values;
113
114	values = tb0219_read(TB0219_DIP_SWITCH);
115	if (values & (1 << pin))
116	return '1';
117
118	return '0';
119	}
120
121	static inline int set_led(char command)
122	{
123	tb0219_write(TB0219_LED, command);
124
125	return 0;
126	}
127
128	static inline int set_gpio_output_pin(unsigned int pin, char command)
129	{
130	unsigned long flags;
131	uint16_t value;
132
133	if (command != '0' && command != '1')
134	return -EINVAL;
135
136	spin_lock_irqsave(&tb0219_lock, flags);
137	value = tb0219_read(TB0219_GPIO_OUTPUT);
138	if (command == '0')
139	value &= ~(1 << pin);
140	else
141	value \|= 1 << pin;
142	tb0219_write(TB0219_GPIO_OUTPUT, value);
143	spin_unlock_irqrestore(&tb0219_lock, flags);
144
145	return 0;
146
147	}
148
149	static ssize_t tanbac_tb0219_read(struct file file, char __user buf, size_t len,
150	loff_t *ppos)
151	{
152	unsigned int minor;
153	char value;
154
496ad9aa	155	minor = iminor(file_inode(file));
1da177e4 LT	156	switch (minor) {
	157	case 0:
	158	value = get_led();
	159	break;
	160	case 16 ... 23:
	161	value = get_gpio_input_pin(minor - 16);
	162	break;
	163	case 32 ... 39:
	164	value = get_gpio_output_pin(minor - 32);
	165	break;
	166	case 48 ... 55:
	167	value = get_dip_switch(minor - 48);
	168	break;
	169	default:
	170	return -EBADF;
	171	}
	172
	173	if (len <= 0)
	174	return -EFAULT;
	175
	176	if (put_user(value, buf))
	177	return -EFAULT;
	178
	179	return 1;
	180	}
	181
	182	static ssize_t tanbac_tb0219_write(struct file file, const char __user data,
	183	size_t len, loff_t *ppos)
	184	{
	185	unsigned int minor;
	186	tb0219_type_t type;
	187	size_t i;
	188	int retval = 0;
	189	char c;
	190
496ad9aa	191	minor = iminor(file_inode(file));
1da177e4 LT	192	switch (minor) {
	193	case 0:
	194	type = TYPE_LED;
	195	break;
	196	case 32 ... 39:
	197	type = TYPE_GPIO_OUTPUT;
	198	break;
	199	default:
	200	return -EBADF;
	201	}
	202
	203	for (i = 0; i < len; i++) {
	204	if (get_user(c, data + i))
	205	return -EFAULT;
	206
	207	switch (type) {
	208	case TYPE_LED:
	209	retval = set_led(c);
	210	break;
	211	case TYPE_GPIO_OUTPUT:
	212	retval = set_gpio_output_pin(minor - 32, c);
	213	break;
	214	}
	215
	216	if (retval < 0)
	217	break;
	218	}
	219
	220	return i;
	221	}
	222
	223	static int tanbac_tb0219_open(struct inode inode, struct file file)
	224	{
	225	unsigned int minor;
	226
	227	minor = iminor(inode);
	228	switch (minor) {
	229	case 0:
	230	case 16 ... 23:
	231	case 32 ... 39:
	232	case 48 ... 55:
c5bf68fe	233	return stream_open(inode, file);
1da177e4 LT	234	default:
	235	break;
	236	}
	237
	238	return -EBADF;
	239	}
	240
	241	static int tanbac_tb0219_release(struct inode inode, struct file file)
	242	{
	243	return 0;
	244	}
	245
62322d25	246	static const struct file_operations tb0219_fops = {
1da177e4 LT	247	.owner = THIS_MODULE,
	248	.read = tanbac_tb0219_read,
	249	.write = tanbac_tb0219_write,
	250	.open = tanbac_tb0219_open,
	251	.release = tanbac_tb0219_release,
6038f373	252	.llseek = no_llseek,
1da177e4 LT	253	};
	254
	255	static void tb0219_restart(char *command)
	256	{
	257	tb0219_write(TB0219_RESET, 0);
	258	}
	259
6e498c10 YY	260	static void tb0219_pci_irq_init(void)
	261	{
	262	/* PCI Slot 1 */
	263	vr41xx_set_irq_trigger(TB0219_PCI_SLOT1_PIN, IRQ_TRIGGER_LEVEL, IRQ_SIGNAL_THROUGH);
	264	vr41xx_set_irq_level(TB0219_PCI_SLOT1_PIN, IRQ_LEVEL_LOW);
	265
	266	/* PCI Slot 2 */
	267	vr41xx_set_irq_trigger(TB0219_PCI_SLOT2_PIN, IRQ_TRIGGER_LEVEL, IRQ_SIGNAL_THROUGH);
	268	vr41xx_set_irq_level(TB0219_PCI_SLOT2_PIN, IRQ_LEVEL_LOW);
	269
	270	/* PCI Slot 3 */
	271	vr41xx_set_irq_trigger(TB0219_PCI_SLOT3_PIN, IRQ_TRIGGER_LEVEL, IRQ_SIGNAL_THROUGH);
	272	vr41xx_set_irq_level(TB0219_PCI_SLOT3_PIN, IRQ_LEVEL_LOW);
	273	}
	274
2223cbec	275	static int tb0219_probe(struct platform_device *dev)
1da177e4 LT	276	{
	277	int retval;
	278
	279	if (request_mem_region(TB0219_START, TB0219_SIZE, "TB0219") == NULL)
	280	return -EBUSY;
	281
	282	tb0219_base = ioremap(TB0219_START, TB0219_SIZE);
	283	if (tb0219_base == NULL) {
	284	release_mem_region(TB0219_START, TB0219_SIZE);
	285	return -ENOMEM;
	286	}
	287
	288	retval = register_chrdev(major, "TB0219", &tb0219_fops);
	289	if (retval < 0) {
	290	iounmap(tb0219_base);
	291	tb0219_base = NULL;
	292	release_mem_region(TB0219_START, TB0219_SIZE);
	293	return retval;
	294	}
	295
1da177e4 LT	296	old_machine_restart = _machine_restart;
	297	_machine_restart = tb0219_restart;
	298
6e498c10 YY	299	tb0219_pci_irq_init();
6e498c10 YY	300
1da177e4 LT	301	if (major == 0) {
	302	major = retval;
	303	printk(KERN_INFO "TB0219: major number %d\n", major);
	304	}
	305
	306	return 0;
	307	}
	308
39af33fc	309	static int tb0219_remove(struct platform_device *dev)
1da177e4 LT	310	{
	311	_machine_restart = old_machine_restart;
	312
	313	iounmap(tb0219_base);
	314	tb0219_base = NULL;
	315
	316	release_mem_region(TB0219_START, TB0219_SIZE);
	317
	318	return 0;
	319	}
	320
	321	static struct platform_device *tb0219_platform_device;
	322
3ae5eaec	323	static struct platform_driver tb0219_device_driver = {
1da177e4	324	.probe = tb0219_probe,
4dde2d2f	325	.remove = tb0219_remove,
3ae5eaec RK	326	.driver = {
	327	.name = "TB0219",
	328	},
1da177e4 LT	329	};
1da177e4 LT	330
d0497614	331	static int __init tanbac_tb0219_init(void)
1da177e4 LT	332	{
	333	int retval;
	334
d0497614 DT	335	tb0219_platform_device = platform_device_alloc("TB0219", -1);
	336	if (!tb0219_platform_device)
	337	return -ENOMEM;
	338
	339	retval = platform_device_add(tb0219_platform_device);
	340	if (retval < 0) {
	341	platform_device_put(tb0219_platform_device);
	342	return retval;
	343	}
1da177e4	344
3ae5eaec	345	retval = platform_driver_register(&tb0219_device_driver);
1da177e4 LT	346	if (retval < 0)
	347	platform_device_unregister(tb0219_platform_device);
	348
	349	return retval;
	350	}
	351
d0497614	352	static void __exit tanbac_tb0219_exit(void)
1da177e4	353	{
3ae5eaec	354	platform_driver_unregister(&tb0219_device_driver);
1da177e4 LT	355	platform_device_unregister(tb0219_platform_device);
	356	}
	357
	358	module_init(tanbac_tb0219_init);
	359	module_exit(tanbac_tb0219_exit);