[mirror_ubuntu-bionic-kernel.git] / drivers / input / serio / arc_ps2.c

/*
 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Driver is originally developed by Pavel Sokolov <psokolov@synopsys.com>
 */

#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/serio.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/slab.h>

#define ARC_PS2_PORTS                   2

#define ARC_ARC_PS2_ID                  0x0001f609

#define STAT_TIMEOUT                    128

#define PS2_STAT_RX_FRM_ERR             (1)
#define PS2_STAT_RX_BUF_OVER            (1 << 1)
#define PS2_STAT_RX_INT_EN              (1 << 2)
#define PS2_STAT_RX_VAL                 (1 << 3)
#define PS2_STAT_TX_ISNOT_FUL           (1 << 4)
#define PS2_STAT_TX_INT_EN              (1 << 5)

struct arc_ps2_port {
	void __iomem *data_addr;
	void __iomem *status_addr;
	struct serio *io;
};

struct arc_ps2_data {
	struct arc_ps2_port port[ARC_PS2_PORTS];
	void __iomem *addr;
	unsigned int frame_error;
	unsigned int buf_overflow;
	unsigned int total_int;
};

static void arc_ps2_check_rx(struct arc_ps2_data *arc_ps2,
			     struct arc_ps2_port *port)
{
	unsigned int timeout = 1000;
	unsigned int flag, status;
	unsigned char data;

	do {
		status = ioread32(port->status_addr);
		if (!(status & PS2_STAT_RX_VAL))
			return;

		data = ioread32(port->data_addr) & 0xff;

		flag = 0;
		arc_ps2->total_int++;
		if (status & PS2_STAT_RX_FRM_ERR) {
			arc_ps2->frame_error++;
			flag |= SERIO_PARITY;
		} else if (status & PS2_STAT_RX_BUF_OVER) {
			arc_ps2->buf_overflow++;
			flag |= SERIO_FRAME;
		}

		serio_interrupt(port->io, data, flag);
	} while (--timeout);

	dev_err(&port->io->dev, "PS/2 hardware stuck\n");
}

static irqreturn_t arc_ps2_interrupt(int irq, void *dev)
{
	struct arc_ps2_data *arc_ps2 = dev;
	int i;

	for (i = 0; i < ARC_PS2_PORTS; i++)
		arc_ps2_check_rx(arc_ps2, &arc_ps2->port[i]);

	return IRQ_HANDLED;
}

static int arc_ps2_write(struct serio *io, unsigned char val)
{
	unsigned status;
	struct arc_ps2_port *port = io->port_data;
	int timeout = STAT_TIMEOUT;

	do {
		status = ioread32(port->status_addr);
		cpu_relax();

		if (status & PS2_STAT_TX_ISNOT_FUL) {
			iowrite32(val & 0xff, port->data_addr);
			return 0;
		}

	} while (--timeout);

	dev_err(&io->dev, "write timeout\n");
	return -ETIMEDOUT;
}

static int arc_ps2_open(struct serio *io)
{
	struct arc_ps2_port *port = io->port_data;

	iowrite32(PS2_STAT_RX_INT_EN, port->status_addr);

	return 0;
}

static void arc_ps2_close(struct serio *io)
{
	struct arc_ps2_port *port = io->port_data;

	iowrite32(ioread32(port->status_addr) & ~PS2_STAT_RX_INT_EN,
		  port->status_addr);
}

static void __iomem *arc_ps2_calc_addr(struct arc_ps2_data *arc_ps2,
						  int index, bool status)
{
	void __iomem *addr;

	addr = arc_ps2->addr + 4 + 4 * index;
	if (status)
		addr += ARC_PS2_PORTS * 4;

	return addr;
}

static void arc_ps2_inhibit_ports(struct arc_ps2_data *arc_ps2)
{
	void __iomem *addr;
	u32 val;
	int i;

	for (i = 0; i < ARC_PS2_PORTS; i++) {
		addr = arc_ps2_calc_addr(arc_ps2, i, true);
		val = ioread32(addr);
		val &= ~(PS2_STAT_RX_INT_EN | PS2_STAT_TX_INT_EN);
		iowrite32(val, addr);
	}
}

static int arc_ps2_create_port(struct platform_device *pdev,
					 struct arc_ps2_data *arc_ps2,
					 int index)
{
	struct arc_ps2_port *port = &arc_ps2->port[index];
	struct serio *io;

	io = kzalloc(sizeof(struct serio), GFP_KERNEL);
	if (!io)
		return -ENOMEM;

	io->id.type = SERIO_8042;
	io->write = arc_ps2_write;
	io->open = arc_ps2_open;
	io->close = arc_ps2_close;
	snprintf(io->name, sizeof(io->name), "ARC PS/2 port%d", index);
	snprintf(io->phys, sizeof(io->phys), "arc/serio%d", index);
	io->port_data = port;

	port->io = io;

	port->data_addr = arc_ps2_calc_addr(arc_ps2, index, false);
	port->status_addr = arc_ps2_calc_addr(arc_ps2, index, true);

	dev_dbg(&pdev->dev, "port%d is allocated (data = 0x%p, status = 0x%p)\n",
		index, port->data_addr, port->status_addr);

	serio_register_port(port->io);
	return 0;
}

static int arc_ps2_probe(struct platform_device *pdev)
{
	struct arc_ps2_data *arc_ps2;
	struct resource *res;
	int irq;
	int error, id, i;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		dev_err(&pdev->dev, "no IO memory defined\n");
		return -EINVAL;
	}

	irq = platform_get_irq_byname(pdev, "arc_ps2_irq");
	if (irq < 0) {
		dev_err(&pdev->dev, "no IRQ defined\n");
		return -EINVAL;
	}

	arc_ps2 = devm_kzalloc(&pdev->dev, sizeof(struct arc_ps2_data),
				GFP_KERNEL);
	if (!arc_ps2) {
		dev_err(&pdev->dev, "out of memory\n");
		return -ENOMEM;
	}

	arc_ps2->addr = devm_request_and_ioremap(&pdev->dev, res);
	if (!arc_ps2->addr)
		return -EBUSY;

	dev_info(&pdev->dev, "irq = %d, address = 0x%p, ports = %i\n",
		 irq, arc_ps2->addr, ARC_PS2_PORTS);

	id = ioread32(arc_ps2->addr);
	if (id != ARC_ARC_PS2_ID) {
		dev_err(&pdev->dev, "device id does not match\n");
		return -ENXIO;
	}

	arc_ps2_inhibit_ports(arc_ps2);

	error = devm_request_irq(&pdev->dev, irq, arc_ps2_interrupt,
				 0, "arc_ps2", arc_ps2);
	if (error) {
		dev_err(&pdev->dev, "Could not allocate IRQ\n");
		return error;
	}

	for (i = 0; i < ARC_PS2_PORTS; i++) {
		error = arc_ps2_create_port(pdev, arc_ps2, i);
		if (error) {
			while (--i >= 0)
				serio_unregister_port(arc_ps2->port[i].io);
			return error;
		}
	}

	platform_set_drvdata(pdev, arc_ps2);

	return 0;
}

static int __devexit arc_ps2_remove(struct platform_device *pdev)
{
	struct arc_ps2_data *arc_ps2 = platform_get_drvdata(pdev);
	int i;

	for (i = 0; i < ARC_PS2_PORTS; i++)
		serio_unregister_port(arc_ps2->port[i].io);

	dev_dbg(&pdev->dev, "interrupt count = %i\n", arc_ps2->total_int);
	dev_dbg(&pdev->dev, "frame error count = %i\n", arc_ps2->frame_error);
	dev_dbg(&pdev->dev, "buffer overflow count = %i\n",
		arc_ps2->buf_overflow);

	return 0;
}

static struct platform_driver arc_ps2_driver = {
	.driver	= {
		.name	= "arc_ps2",
		.owner	= THIS_MODULE,
	},
	.probe	= arc_ps2_probe,
	.remove	= arc_ps2_remove,
};

module_platform_driver(arc_ps2_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Pavel Sokolov <psokolov@synopsys.com>");
MODULE_DESCRIPTION("ARC PS/2 Driver");
Commit	Line	Data
e4b29009 MJ	1	/*
	2	* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 as
	6	* published by the Free Software Foundation.
	7	*
	8	* Driver is originally developed by Pavel Sokolov <psokolov@synopsys.com>
	9	*/
	10
	11	#include <linux/module.h>
	12	#include <linux/interrupt.h>
	13	#include <linux/input.h>
	14	#include <linux/serio.h>
	15	#include <linux/platform_device.h>
	16	#include <linux/io.h>
	17	#include <linux/kernel.h>
	18	#include <linux/slab.h>
	19
	20	#define ARC_PS2_PORTS 2
	21
	22	#define ARC_ARC_PS2_ID 0x0001f609
	23
	24	#define STAT_TIMEOUT 128
	25
	26	#define PS2_STAT_RX_FRM_ERR (1)
	27	#define PS2_STAT_RX_BUF_OVER (1 << 1)
	28	#define PS2_STAT_RX_INT_EN (1 << 2)
	29	#define PS2_STAT_RX_VAL (1 << 3)
	30	#define PS2_STAT_TX_ISNOT_FUL (1 << 4)
	31	#define PS2_STAT_TX_INT_EN (1 << 5)
	32
	33	struct arc_ps2_port {
	34	void __iomem *data_addr;
	35	void __iomem *status_addr;
	36	struct serio *io;
	37	};
	38
	39	struct arc_ps2_data {
	40	struct arc_ps2_port port[ARC_PS2_PORTS];
e4b29009 MJ	41	void __iomem *addr;
	42	unsigned int frame_error;
	43	unsigned int buf_overflow;
	44	unsigned int total_int;
	45	};
	46
	47	static void arc_ps2_check_rx(struct arc_ps2_data *arc_ps2,
	48	struct arc_ps2_port *port)
	49	{
	50	unsigned int timeout = 1000;
	51	unsigned int flag, status;
	52	unsigned char data;
	53
	54	do {
	55	status = ioread32(port->status_addr);
	56	if (!(status & PS2_STAT_RX_VAL))
	57	return;
	58
	59	data = ioread32(port->data_addr) & 0xff;
	60
	61	flag = 0;
	62	arc_ps2->total_int++;
	63	if (status & PS2_STAT_RX_FRM_ERR) {
	64	arc_ps2->frame_error++;
	65	flag \|= SERIO_PARITY;
	66	} else if (status & PS2_STAT_RX_BUF_OVER) {
	67	arc_ps2->buf_overflow++;
	68	flag \|= SERIO_FRAME;
	69	}
	70
	71	serio_interrupt(port->io, data, flag);
	72	} while (--timeout);
	73
	74	dev_err(&port->io->dev, "PS/2 hardware stuck\n");
	75	}
	76
	77	static irqreturn_t arc_ps2_interrupt(int irq, void *dev)
	78	{
	79	struct arc_ps2_data *arc_ps2 = dev;
	80	int i;
	81
	82	for (i = 0; i < ARC_PS2_PORTS; i++)
	83	arc_ps2_check_rx(arc_ps2, &arc_ps2->port[i]);
	84
	85	return IRQ_HANDLED;
	86	}
	87
	88	static int arc_ps2_write(struct serio *io, unsigned char val)
	89	{
	90	unsigned status;
	91	struct arc_ps2_port *port = io->port_data;
	92	int timeout = STAT_TIMEOUT;
	93
	94	do {
	95	status = ioread32(port->status_addr);
	96	cpu_relax();
	97
	98	if (status & PS2_STAT_TX_ISNOT_FUL) {
	99	iowrite32(val & 0xff, port->data_addr);
	100	return 0;
	101	}
	102
	103	} while (--timeout);
	104
105	dev_err(&io->dev, "write timeout\n");
106	return -ETIMEDOUT;
107	}
108
109	static int arc_ps2_open(struct serio *io)
110	{
111	struct arc_ps2_port *port = io->port_data;
112
113	iowrite32(PS2_STAT_RX_INT_EN, port->status_addr);
114
115	return 0;
116	}
117
118	static void arc_ps2_close(struct serio *io)
119	{
120	struct arc_ps2_port *port = io->port_data;
121
122	iowrite32(ioread32(port->status_addr) & ~PS2_STAT_RX_INT_EN,
123	port->status_addr);
124	}
125
5298cc4c	126	static void __iomem arc_ps2_calc_addr(struct arc_ps2_data arc_ps2,
a4d6983c DT	127	int index, bool status)
	128	{
	129	void __iomem *addr;
	130
	131	addr = arc_ps2->addr + 4 + 4 * index;
	132	if (status)
	133	addr += ARC_PS2_PORTS * 4;
	134
	135	return addr;
	136	}
	137
5298cc4c	138	static void arc_ps2_inhibit_ports(struct arc_ps2_data *arc_ps2)
a4d6983c DT	139	{
	140	void __iomem *addr;
	141	u32 val;
	142	int i;
	143
	144	for (i = 0; i < ARC_PS2_PORTS; i++) {
	145	addr = arc_ps2_calc_addr(arc_ps2, i, true);
	146	val = ioread32(addr);
	147	val &= ~(PS2_STAT_RX_INT_EN \| PS2_STAT_TX_INT_EN);
	148	iowrite32(val, addr);
	149	}
	150	}
	151
5298cc4c	152	static int arc_ps2_create_port(struct platform_device *pdev,
e4b29009 MJ	153	struct arc_ps2_data *arc_ps2,
	154	int index)
	155	{
	156	struct arc_ps2_port *port = &arc_ps2->port[index];
	157	struct serio *io;
	158
	159	io = kzalloc(sizeof(struct serio), GFP_KERNEL);
	160	if (!io)
	161	return -ENOMEM;
	162
	163	io->id.type = SERIO_8042;
	164	io->write = arc_ps2_write;
	165	io->open = arc_ps2_open;
	166	io->close = arc_ps2_close;
	167	snprintf(io->name, sizeof(io->name), "ARC PS/2 port%d", index);
	168	snprintf(io->phys, sizeof(io->phys), "arc/serio%d", index);
	169	io->port_data = port;
	170
	171	port->io = io;
	172
a4d6983c DT	173	port->data_addr = arc_ps2_calc_addr(arc_ps2, index, false);
a4d6983c DT	174	port->status_addr = arc_ps2_calc_addr(arc_ps2, index, true);
e4b29009 MJ	175
	176	dev_dbg(&pdev->dev, "port%d is allocated (data = 0x%p, status = 0x%p)\n",
	177	index, port->data_addr, port->status_addr);
	178
	179	serio_register_port(port->io);
	180	return 0;
	181	}
	182
5298cc4c	183	static int arc_ps2_probe(struct platform_device *pdev)
e4b29009 MJ	184	{
e4b29009 MJ	185	struct arc_ps2_data *arc_ps2;
a4d6983c DT	186	struct resource *res;
a4d6983c DT	187	int irq;
e4b29009 MJ	188	int error, id, i;
e4b29009 MJ	189
a4d6983c DT	190	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
a4d6983c DT	191	if (!res) {
e4b29009	192	dev_err(&pdev->dev, "no IO memory defined\n");
a4d6983c	193	return -EINVAL;
e4b29009 MJ	194	}
e4b29009 MJ	195
a4d6983c DT	196	irq = platform_get_irq_byname(pdev, "arc_ps2_irq");
a4d6983c DT	197	if (irq < 0) {
e4b29009	198	dev_err(&pdev->dev, "no IRQ defined\n");
a4d6983c	199	return -EINVAL;
e4b29009 MJ	200	}
e4b29009 MJ	201
a4d6983c DT	202	arc_ps2 = devm_kzalloc(&pdev->dev, sizeof(struct arc_ps2_data),
	203	GFP_KERNEL);
	204	if (!arc_ps2) {
	205	dev_err(&pdev->dev, "out of memory\n");
	206	return -ENOMEM;
e4b29009 MJ	207	}
e4b29009 MJ	208
a4d6983c DT	209	arc_ps2->addr = devm_request_and_ioremap(&pdev->dev, res);
	210	if (!arc_ps2->addr)
	211	return -EBUSY;
e4b29009 MJ	212
e4b29009 MJ	213	dev_info(&pdev->dev, "irq = %d, address = 0x%p, ports = %i\n",
a4d6983c	214	irq, arc_ps2->addr, ARC_PS2_PORTS);
e4b29009 MJ	215
	216	id = ioread32(arc_ps2->addr);
	217	if (id != ARC_ARC_PS2_ID) {
	218	dev_err(&pdev->dev, "device id does not match\n");
a4d6983c	219	return -ENXIO;
e4b29009 MJ	220	}
e4b29009 MJ	221
a4d6983c	222	arc_ps2_inhibit_ports(arc_ps2);
e4b29009	223
a4d6983c DT	224	error = devm_request_irq(&pdev->dev, irq, arc_ps2_interrupt,
a4d6983c DT	225	0, "arc_ps2", arc_ps2);
e4b29009 MJ	226	if (error) {
e4b29009 MJ	227	dev_err(&pdev->dev, "Could not allocate IRQ\n");
a4d6983c DT	228	return error;
	229	}
	230
	231	for (i = 0; i < ARC_PS2_PORTS; i++) {
	232	error = arc_ps2_create_port(pdev, arc_ps2, i);
	233	if (error) {
	234	while (--i >= 0)
	235	serio_unregister_port(arc_ps2->port[i].io);
	236	return error;
	237	}
e4b29009 MJ	238	}
	239
	240	platform_set_drvdata(pdev, arc_ps2);
	241
	242	return 0;
e4b29009 MJ	243	}
	244
	245	static int __devexit arc_ps2_remove(struct platform_device *pdev)
	246	{
	247	struct arc_ps2_data *arc_ps2 = platform_get_drvdata(pdev);
	248	int i;
	249
	250	for (i = 0; i < ARC_PS2_PORTS; i++)
	251	serio_unregister_port(arc_ps2->port[i].io);
	252
e4b29009 MJ	253	dev_dbg(&pdev->dev, "interrupt count = %i\n", arc_ps2->total_int);
	254	dev_dbg(&pdev->dev, "frame error count = %i\n", arc_ps2->frame_error);
	255	dev_dbg(&pdev->dev, "buffer overflow count = %i\n",
	256	arc_ps2->buf_overflow);
	257
e4b29009 MJ	258	return 0;
	259	}
	260
	261	static struct platform_driver arc_ps2_driver = {
	262	.driver = {
	263	.name = "arc_ps2",
	264	.owner = THIS_MODULE,
	265	},
	266	.probe = arc_ps2_probe,
1cb0aa88	267	.remove = arc_ps2_remove,
e4b29009 MJ	268	};
	269
	270	module_platform_driver(arc_ps2_driver);
	271
	272	MODULE_LICENSE("GPL");
	273	MODULE_AUTHOR("Pavel Sokolov <psokolov@synopsys.com>");
	274	MODULE_DESCRIPTION("ARC PS/2 Driver");