1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
5 * Driver is originally developed by Pavel Sokolov <psokolov@synopsys.com>
9 #include <linux/module.h>
10 #include <linux/interrupt.h>
11 #include <linux/input.h>
12 #include <linux/serio.h>
13 #include <linux/platform_device.h>
16 #include <linux/kernel.h>
17 #include <linux/slab.h>
19 #define ARC_PS2_PORTS 2
21 #define ARC_ARC_PS2_ID 0x0001f609
23 #define STAT_TIMEOUT 128
25 #define PS2_STAT_RX_FRM_ERR (1)
26 #define PS2_STAT_RX_BUF_OVER (1 << 1)
27 #define PS2_STAT_RX_INT_EN (1 << 2)
28 #define PS2_STAT_RX_VAL (1 << 3)
29 #define PS2_STAT_TX_ISNOT_FUL (1 << 4)
30 #define PS2_STAT_TX_INT_EN (1 << 5)
33 void __iomem *data_addr;
34 void __iomem *status_addr;
39 struct arc_ps2_port port[ARC_PS2_PORTS];
41 unsigned int frame_error;
42 unsigned int buf_overflow;
43 unsigned int total_int;
46 static void arc_ps2_check_rx(struct arc_ps2_data *arc_ps2,
47 struct arc_ps2_port *port)
49 unsigned int timeout = 1000;
50 unsigned int flag, status;
54 status = ioread32(port->status_addr);
55 if (!(status & PS2_STAT_RX_VAL))
58 data = ioread32(port->data_addr) & 0xff;
62 if (status & PS2_STAT_RX_FRM_ERR) {
63 arc_ps2->frame_error++;
65 } else if (status & PS2_STAT_RX_BUF_OVER) {
66 arc_ps2->buf_overflow++;
70 serio_interrupt(port->io, data, flag);
73 dev_err(&port->io->dev, "PS/2 hardware stuck\n");
76 static irqreturn_t arc_ps2_interrupt(int irq, void *dev)
78 struct arc_ps2_data *arc_ps2 = dev;
81 for (i = 0; i < ARC_PS2_PORTS; i++)
82 arc_ps2_check_rx(arc_ps2, &arc_ps2->port[i]);
87 static int arc_ps2_write(struct serio *io, unsigned char val)
90 struct arc_ps2_port *port = io->port_data;
91 int timeout = STAT_TIMEOUT;
94 status = ioread32(port->status_addr);
97 if (status & PS2_STAT_TX_ISNOT_FUL) {
98 iowrite32(val & 0xff, port->data_addr);
104 dev_err(&io->dev, "write timeout\n");
108 static int arc_ps2_open(struct serio *io)
110 struct arc_ps2_port *port = io->port_data;
112 iowrite32(PS2_STAT_RX_INT_EN, port->status_addr);
117 static void arc_ps2_close(struct serio *io)
119 struct arc_ps2_port *port = io->port_data;
121 iowrite32(ioread32(port->status_addr) & ~PS2_STAT_RX_INT_EN,
125 static void __iomem *arc_ps2_calc_addr(struct arc_ps2_data *arc_ps2,
126 int index, bool status)
130 addr = arc_ps2->addr + 4 + 4 * index;
132 addr += ARC_PS2_PORTS * 4;
137 static void arc_ps2_inhibit_ports(struct arc_ps2_data *arc_ps2)
143 for (i = 0; i < ARC_PS2_PORTS; i++) {
144 addr = arc_ps2_calc_addr(arc_ps2, i, true);
145 val = ioread32(addr);
146 val &= ~(PS2_STAT_RX_INT_EN | PS2_STAT_TX_INT_EN);
147 iowrite32(val, addr);
151 static int arc_ps2_create_port(struct platform_device *pdev,
152 struct arc_ps2_data *arc_ps2,
155 struct arc_ps2_port *port = &arc_ps2->port[index];
158 io = kzalloc(sizeof(struct serio), GFP_KERNEL);
162 io->id.type = SERIO_8042;
163 io->write = arc_ps2_write;
164 io->open = arc_ps2_open;
165 io->close = arc_ps2_close;
166 snprintf(io->name, sizeof(io->name), "ARC PS/2 port%d", index);
167 snprintf(io->phys, sizeof(io->phys), "arc/serio%d", index);
168 io->port_data = port;
172 port->data_addr = arc_ps2_calc_addr(arc_ps2, index, false);
173 port->status_addr = arc_ps2_calc_addr(arc_ps2, index, true);
175 dev_dbg(&pdev->dev, "port%d is allocated (data = 0x%p, status = 0x%p)\n",
176 index, port->data_addr, port->status_addr);
178 serio_register_port(port->io);
182 static int arc_ps2_probe(struct platform_device *pdev)
184 struct arc_ps2_data *arc_ps2;
185 struct resource *res;
189 irq = platform_get_irq_byname(pdev, "arc_ps2_irq");
193 arc_ps2 = devm_kzalloc(&pdev->dev, sizeof(struct arc_ps2_data),
196 dev_err(&pdev->dev, "out of memory\n");
200 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
201 arc_ps2->addr = devm_ioremap_resource(&pdev->dev, res);
202 if (IS_ERR(arc_ps2->addr))
203 return PTR_ERR(arc_ps2->addr);
205 dev_info(&pdev->dev, "irq = %d, address = 0x%p, ports = %i\n",
206 irq, arc_ps2->addr, ARC_PS2_PORTS);
208 id = ioread32(arc_ps2->addr);
209 if (id != ARC_ARC_PS2_ID) {
210 dev_err(&pdev->dev, "device id does not match\n");
214 arc_ps2_inhibit_ports(arc_ps2);
216 error = devm_request_irq(&pdev->dev, irq, arc_ps2_interrupt,
217 0, "arc_ps2", arc_ps2);
219 dev_err(&pdev->dev, "Could not allocate IRQ\n");
223 for (i = 0; i < ARC_PS2_PORTS; i++) {
224 error = arc_ps2_create_port(pdev, arc_ps2, i);
227 serio_unregister_port(arc_ps2->port[i].io);
232 platform_set_drvdata(pdev, arc_ps2);
237 static int arc_ps2_remove(struct platform_device *pdev)
239 struct arc_ps2_data *arc_ps2 = platform_get_drvdata(pdev);
242 for (i = 0; i < ARC_PS2_PORTS; i++)
243 serio_unregister_port(arc_ps2->port[i].io);
245 dev_dbg(&pdev->dev, "interrupt count = %i\n", arc_ps2->total_int);
246 dev_dbg(&pdev->dev, "frame error count = %i\n", arc_ps2->frame_error);
247 dev_dbg(&pdev->dev, "buffer overflow count = %i\n",
248 arc_ps2->buf_overflow);
254 static const struct of_device_id arc_ps2_match[] = {
255 { .compatible = "snps,arc_ps2" },
258 MODULE_DEVICE_TABLE(of, arc_ps2_match);
261 static struct platform_driver arc_ps2_driver = {
264 .of_match_table = of_match_ptr(arc_ps2_match),
266 .probe = arc_ps2_probe,
267 .remove = arc_ps2_remove,
270 module_platform_driver(arc_ps2_driver);
272 MODULE_LICENSE("GPL");
273 MODULE_AUTHOR("Pavel Sokolov <psokolov@synopsys.com>");
274 MODULE_DESCRIPTION("ARC PS/2 Driver");