276 lines
6.3 KiB
C
276 lines
6.3 KiB
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/err.h>
|
|
#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_ioremap_resource(&pdev->dev, res);
|
|
if (IS_ERR(arc_ps2->addr))
|
|
return PTR_ERR(arc_ps2->addr);
|
|
|
|
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 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");
|