2 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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.
8 * Driver is originally developed by Pavel Sokolov <psokolov@synopsys.com>
11 #include <linux/err.h>
12 #include <linux/module.h>
13 #include <linux/interrupt.h>
14 #include <linux/input.h>
15 #include <linux/serio.h>
16 #include <linux/platform_device.h>
18 #include <linux/kernel.h>
19 #include <linux/slab.h>
21 #define ARC_PS2_PORTS 2
23 #define ARC_ARC_PS2_ID 0x0001f609
25 #define STAT_TIMEOUT 128
27 #define PS2_STAT_RX_FRM_ERR (1)
28 #define PS2_STAT_RX_BUF_OVER (1 << 1)
29 #define PS2_STAT_RX_INT_EN (1 << 2)
30 #define PS2_STAT_RX_VAL (1 << 3)
31 #define PS2_STAT_TX_ISNOT_FUL (1 << 4)
32 #define PS2_STAT_TX_INT_EN (1 << 5)
35 void __iomem *data_addr;
36 void __iomem *status_addr;
41 struct arc_ps2_port port[ARC_PS2_PORTS];
43 unsigned int frame_error;
44 unsigned int buf_overflow;
45 unsigned int total_int;
48 static void arc_ps2_check_rx(struct arc_ps2_data *arc_ps2,
49 struct arc_ps2_port *port)
51 unsigned int timeout = 1000;
52 unsigned int flag, status;
56 status = ioread32(port->status_addr);
57 if (!(status & PS2_STAT_RX_VAL))
60 data = ioread32(port->data_addr) & 0xff;
64 if (status & PS2_STAT_RX_FRM_ERR) {
65 arc_ps2->frame_error++;
67 } else if (status & PS2_STAT_RX_BUF_OVER) {
68 arc_ps2->buf_overflow++;
72 serio_interrupt(port->io, data, flag);
75 dev_err(&port->io->dev, "PS/2 hardware stuck\n");
78 static irqreturn_t arc_ps2_interrupt(int irq, void *dev)
80 struct arc_ps2_data *arc_ps2 = dev;
83 for (i = 0; i < ARC_PS2_PORTS; i++)
84 arc_ps2_check_rx(arc_ps2, &arc_ps2->port[i]);
89 static int arc_ps2_write(struct serio *io, unsigned char val)
92 struct arc_ps2_port *port = io->port_data;
93 int timeout = STAT_TIMEOUT;
96 status = ioread32(port->status_addr);
99 if (status & PS2_STAT_TX_ISNOT_FUL) {
100 iowrite32(val & 0xff, port->data_addr);
106 dev_err(&io->dev, "write timeout\n");
110 static int arc_ps2_open(struct serio *io)
112 struct arc_ps2_port *port = io->port_data;
114 iowrite32(PS2_STAT_RX_INT_EN, port->status_addr);
119 static void arc_ps2_close(struct serio *io)
121 struct arc_ps2_port *port = io->port_data;
123 iowrite32(ioread32(port->status_addr) & ~PS2_STAT_RX_INT_EN,
127 static void __iomem *arc_ps2_calc_addr(struct arc_ps2_data *arc_ps2,
128 int index, bool status)
132 addr = arc_ps2->addr + 4 + 4 * index;
134 addr += ARC_PS2_PORTS * 4;
139 static void arc_ps2_inhibit_ports(struct arc_ps2_data *arc_ps2)
145 for (i = 0; i < ARC_PS2_PORTS; i++) {
146 addr = arc_ps2_calc_addr(arc_ps2, i, true);
147 val = ioread32(addr);
148 val &= ~(PS2_STAT_RX_INT_EN | PS2_STAT_TX_INT_EN);
149 iowrite32(val, addr);
153 static int arc_ps2_create_port(struct platform_device *pdev,
154 struct arc_ps2_data *arc_ps2,
157 struct arc_ps2_port *port = &arc_ps2->port[index];
160 io = kzalloc(sizeof(struct serio), GFP_KERNEL);
164 io->id.type = SERIO_8042;
165 io->write = arc_ps2_write;
166 io->open = arc_ps2_open;
167 io->close = arc_ps2_close;
168 snprintf(io->name, sizeof(io->name), "ARC PS/2 port%d", index);
169 snprintf(io->phys, sizeof(io->phys), "arc/serio%d", index);
170 io->port_data = port;
174 port->data_addr = arc_ps2_calc_addr(arc_ps2, index, false);
175 port->status_addr = arc_ps2_calc_addr(arc_ps2, index, true);
177 dev_dbg(&pdev->dev, "port%d is allocated (data = 0x%p, status = 0x%p)\n",
178 index, port->data_addr, port->status_addr);
180 serio_register_port(port->io);
184 static int arc_ps2_probe(struct platform_device *pdev)
186 struct arc_ps2_data *arc_ps2;
187 struct resource *res;
191 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
193 dev_err(&pdev->dev, "no IO memory defined\n");
197 irq = platform_get_irq_byname(pdev, "arc_ps2_irq");
199 dev_err(&pdev->dev, "no IRQ defined\n");
203 arc_ps2 = devm_kzalloc(&pdev->dev, sizeof(struct arc_ps2_data),
206 dev_err(&pdev->dev, "out of memory\n");
210 arc_ps2->addr = devm_ioremap_resource(&pdev->dev, res);
211 if (IS_ERR(arc_ps2->addr))
212 return PTR_ERR(arc_ps2->addr);
214 dev_info(&pdev->dev, "irq = %d, address = 0x%p, ports = %i\n",
215 irq, arc_ps2->addr, ARC_PS2_PORTS);
217 id = ioread32(arc_ps2->addr);
218 if (id != ARC_ARC_PS2_ID) {
219 dev_err(&pdev->dev, "device id does not match\n");
223 arc_ps2_inhibit_ports(arc_ps2);
225 error = devm_request_irq(&pdev->dev, irq, arc_ps2_interrupt,
226 0, "arc_ps2", arc_ps2);
228 dev_err(&pdev->dev, "Could not allocate IRQ\n");
232 for (i = 0; i < ARC_PS2_PORTS; i++) {
233 error = arc_ps2_create_port(pdev, arc_ps2, i);
236 serio_unregister_port(arc_ps2->port[i].io);
241 platform_set_drvdata(pdev, arc_ps2);
246 static int arc_ps2_remove(struct platform_device *pdev)
248 struct arc_ps2_data *arc_ps2 = platform_get_drvdata(pdev);
251 for (i = 0; i < ARC_PS2_PORTS; i++)
252 serio_unregister_port(arc_ps2->port[i].io);
254 dev_dbg(&pdev->dev, "interrupt count = %i\n", arc_ps2->total_int);
255 dev_dbg(&pdev->dev, "frame error count = %i\n", arc_ps2->frame_error);
256 dev_dbg(&pdev->dev, "buffer overflow count = %i\n",
257 arc_ps2->buf_overflow);
262 static struct platform_driver arc_ps2_driver = {
265 .owner = THIS_MODULE,
267 .probe = arc_ps2_probe,
268 .remove = arc_ps2_remove,
271 module_platform_driver(arc_ps2_driver);
273 MODULE_LICENSE("GPL");
274 MODULE_AUTHOR("Pavel Sokolov <psokolov@synopsys.com>");
275 MODULE_DESCRIPTION("ARC PS/2 Driver");