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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 | ||
8d1cbc98 | 11 | #include <linux/err.h> |
e4b29009 MJ |
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> | |
2c0a4f8b | 17 | #include <linux/of.h> |
e4b29009 MJ |
18 | #include <linux/io.h> |
19 | #include <linux/kernel.h> | |
20 | #include <linux/slab.h> | |
21 | ||
22 | #define ARC_PS2_PORTS 2 | |
23 | ||
24 | #define ARC_ARC_PS2_ID 0x0001f609 | |
25 | ||
26 | #define STAT_TIMEOUT 128 | |
27 | ||
28 | #define PS2_STAT_RX_FRM_ERR (1) | |
29 | #define PS2_STAT_RX_BUF_OVER (1 << 1) | |
30 | #define PS2_STAT_RX_INT_EN (1 << 2) | |
31 | #define PS2_STAT_RX_VAL (1 << 3) | |
32 | #define PS2_STAT_TX_ISNOT_FUL (1 << 4) | |
33 | #define PS2_STAT_TX_INT_EN (1 << 5) | |
34 | ||
35 | struct arc_ps2_port { | |
36 | void __iomem *data_addr; | |
37 | void __iomem *status_addr; | |
38 | struct serio *io; | |
39 | }; | |
40 | ||
41 | struct arc_ps2_data { | |
42 | struct arc_ps2_port port[ARC_PS2_PORTS]; | |
e4b29009 MJ |
43 | void __iomem *addr; |
44 | unsigned int frame_error; | |
45 | unsigned int buf_overflow; | |
46 | unsigned int total_int; | |
47 | }; | |
48 | ||
49 | static void arc_ps2_check_rx(struct arc_ps2_data *arc_ps2, | |
50 | struct arc_ps2_port *port) | |
51 | { | |
52 | unsigned int timeout = 1000; | |
53 | unsigned int flag, status; | |
54 | unsigned char data; | |
55 | ||
56 | do { | |
57 | status = ioread32(port->status_addr); | |
58 | if (!(status & PS2_STAT_RX_VAL)) | |
59 | return; | |
60 | ||
61 | data = ioread32(port->data_addr) & 0xff; | |
62 | ||
63 | flag = 0; | |
64 | arc_ps2->total_int++; | |
65 | if (status & PS2_STAT_RX_FRM_ERR) { | |
66 | arc_ps2->frame_error++; | |
67 | flag |= SERIO_PARITY; | |
68 | } else if (status & PS2_STAT_RX_BUF_OVER) { | |
69 | arc_ps2->buf_overflow++; | |
70 | flag |= SERIO_FRAME; | |
71 | } | |
72 | ||
73 | serio_interrupt(port->io, data, flag); | |
74 | } while (--timeout); | |
75 | ||
76 | dev_err(&port->io->dev, "PS/2 hardware stuck\n"); | |
77 | } | |
78 | ||
79 | static irqreturn_t arc_ps2_interrupt(int irq, void *dev) | |
80 | { | |
81 | struct arc_ps2_data *arc_ps2 = dev; | |
82 | int i; | |
83 | ||
84 | for (i = 0; i < ARC_PS2_PORTS; i++) | |
85 | arc_ps2_check_rx(arc_ps2, &arc_ps2->port[i]); | |
86 | ||
87 | return IRQ_HANDLED; | |
88 | } | |
89 | ||
90 | static int arc_ps2_write(struct serio *io, unsigned char val) | |
91 | { | |
92 | unsigned status; | |
93 | struct arc_ps2_port *port = io->port_data; | |
94 | int timeout = STAT_TIMEOUT; | |
95 | ||
96 | do { | |
97 | status = ioread32(port->status_addr); | |
98 | cpu_relax(); | |
99 | ||
100 | if (status & PS2_STAT_TX_ISNOT_FUL) { | |
101 | iowrite32(val & 0xff, port->data_addr); | |
102 | return 0; | |
103 | } | |
104 | ||
105 | } while (--timeout); | |
106 | ||
107 | dev_err(&io->dev, "write timeout\n"); | |
108 | return -ETIMEDOUT; | |
109 | } | |
110 | ||
111 | static int arc_ps2_open(struct serio *io) | |
112 | { | |
113 | struct arc_ps2_port *port = io->port_data; | |
114 | ||
115 | iowrite32(PS2_STAT_RX_INT_EN, port->status_addr); | |
116 | ||
117 | return 0; | |
118 | } | |
119 | ||
120 | static void arc_ps2_close(struct serio *io) | |
121 | { | |
122 | struct arc_ps2_port *port = io->port_data; | |
123 | ||
124 | iowrite32(ioread32(port->status_addr) & ~PS2_STAT_RX_INT_EN, | |
125 | port->status_addr); | |
126 | } | |
127 | ||
5298cc4c | 128 | static void __iomem *arc_ps2_calc_addr(struct arc_ps2_data *arc_ps2, |
a4d6983c DT |
129 | int index, bool status) |
130 | { | |
131 | void __iomem *addr; | |
132 | ||
133 | addr = arc_ps2->addr + 4 + 4 * index; | |
134 | if (status) | |
135 | addr += ARC_PS2_PORTS * 4; | |
136 | ||
137 | return addr; | |
138 | } | |
139 | ||
5298cc4c | 140 | static void arc_ps2_inhibit_ports(struct arc_ps2_data *arc_ps2) |
a4d6983c DT |
141 | { |
142 | void __iomem *addr; | |
143 | u32 val; | |
144 | int i; | |
145 | ||
146 | for (i = 0; i < ARC_PS2_PORTS; i++) { | |
147 | addr = arc_ps2_calc_addr(arc_ps2, i, true); | |
148 | val = ioread32(addr); | |
149 | val &= ~(PS2_STAT_RX_INT_EN | PS2_STAT_TX_INT_EN); | |
150 | iowrite32(val, addr); | |
151 | } | |
152 | } | |
153 | ||
5298cc4c | 154 | static int arc_ps2_create_port(struct platform_device *pdev, |
e4b29009 MJ |
155 | struct arc_ps2_data *arc_ps2, |
156 | int index) | |
157 | { | |
158 | struct arc_ps2_port *port = &arc_ps2->port[index]; | |
159 | struct serio *io; | |
160 | ||
161 | io = kzalloc(sizeof(struct serio), GFP_KERNEL); | |
162 | if (!io) | |
163 | return -ENOMEM; | |
164 | ||
165 | io->id.type = SERIO_8042; | |
166 | io->write = arc_ps2_write; | |
167 | io->open = arc_ps2_open; | |
168 | io->close = arc_ps2_close; | |
169 | snprintf(io->name, sizeof(io->name), "ARC PS/2 port%d", index); | |
170 | snprintf(io->phys, sizeof(io->phys), "arc/serio%d", index); | |
171 | io->port_data = port; | |
172 | ||
173 | port->io = io; | |
174 | ||
a4d6983c DT |
175 | port->data_addr = arc_ps2_calc_addr(arc_ps2, index, false); |
176 | port->status_addr = arc_ps2_calc_addr(arc_ps2, index, true); | |
e4b29009 MJ |
177 | |
178 | dev_dbg(&pdev->dev, "port%d is allocated (data = 0x%p, status = 0x%p)\n", | |
179 | index, port->data_addr, port->status_addr); | |
180 | ||
181 | serio_register_port(port->io); | |
182 | return 0; | |
183 | } | |
184 | ||
5298cc4c | 185 | static int arc_ps2_probe(struct platform_device *pdev) |
e4b29009 MJ |
186 | { |
187 | struct arc_ps2_data *arc_ps2; | |
a4d6983c DT |
188 | struct resource *res; |
189 | int irq; | |
e4b29009 MJ |
190 | int error, id, i; |
191 | ||
a4d6983c DT |
192 | irq = platform_get_irq_byname(pdev, "arc_ps2_irq"); |
193 | if (irq < 0) { | |
e4b29009 | 194 | dev_err(&pdev->dev, "no IRQ defined\n"); |
a4d6983c | 195 | return -EINVAL; |
e4b29009 MJ |
196 | } |
197 | ||
a4d6983c DT |
198 | arc_ps2 = devm_kzalloc(&pdev->dev, sizeof(struct arc_ps2_data), |
199 | GFP_KERNEL); | |
200 | if (!arc_ps2) { | |
201 | dev_err(&pdev->dev, "out of memory\n"); | |
202 | return -ENOMEM; | |
e4b29009 MJ |
203 | } |
204 | ||
ef0aca7f | 205 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
8d1cbc98 TR |
206 | arc_ps2->addr = devm_ioremap_resource(&pdev->dev, res); |
207 | if (IS_ERR(arc_ps2->addr)) | |
208 | return PTR_ERR(arc_ps2->addr); | |
e4b29009 MJ |
209 | |
210 | dev_info(&pdev->dev, "irq = %d, address = 0x%p, ports = %i\n", | |
a4d6983c | 211 | irq, arc_ps2->addr, ARC_PS2_PORTS); |
e4b29009 MJ |
212 | |
213 | id = ioread32(arc_ps2->addr); | |
214 | if (id != ARC_ARC_PS2_ID) { | |
215 | dev_err(&pdev->dev, "device id does not match\n"); | |
a4d6983c | 216 | return -ENXIO; |
e4b29009 MJ |
217 | } |
218 | ||
a4d6983c | 219 | arc_ps2_inhibit_ports(arc_ps2); |
e4b29009 | 220 | |
a4d6983c DT |
221 | error = devm_request_irq(&pdev->dev, irq, arc_ps2_interrupt, |
222 | 0, "arc_ps2", arc_ps2); | |
e4b29009 MJ |
223 | if (error) { |
224 | dev_err(&pdev->dev, "Could not allocate IRQ\n"); | |
a4d6983c DT |
225 | return error; |
226 | } | |
227 | ||
228 | for (i = 0; i < ARC_PS2_PORTS; i++) { | |
229 | error = arc_ps2_create_port(pdev, arc_ps2, i); | |
230 | if (error) { | |
231 | while (--i >= 0) | |
232 | serio_unregister_port(arc_ps2->port[i].io); | |
233 | return error; | |
234 | } | |
e4b29009 MJ |
235 | } |
236 | ||
237 | platform_set_drvdata(pdev, arc_ps2); | |
238 | ||
239 | return 0; | |
e4b29009 MJ |
240 | } |
241 | ||
e2619cf7 | 242 | static int arc_ps2_remove(struct platform_device *pdev) |
e4b29009 MJ |
243 | { |
244 | struct arc_ps2_data *arc_ps2 = platform_get_drvdata(pdev); | |
245 | int i; | |
246 | ||
247 | for (i = 0; i < ARC_PS2_PORTS; i++) | |
248 | serio_unregister_port(arc_ps2->port[i].io); | |
249 | ||
e4b29009 MJ |
250 | dev_dbg(&pdev->dev, "interrupt count = %i\n", arc_ps2->total_int); |
251 | dev_dbg(&pdev->dev, "frame error count = %i\n", arc_ps2->frame_error); | |
252 | dev_dbg(&pdev->dev, "buffer overflow count = %i\n", | |
253 | arc_ps2->buf_overflow); | |
254 | ||
e4b29009 MJ |
255 | return 0; |
256 | } | |
257 | ||
2c0a4f8b MJ |
258 | #ifdef CONFIG_OF |
259 | static const struct of_device_id arc_ps2_match[] = { | |
260 | { .compatible = "snps,arc_ps2" }, | |
261 | { }, | |
262 | }; | |
263 | MODULE_DEVICE_TABLE(of, arc_ps2_match); | |
264 | #endif | |
265 | ||
e4b29009 MJ |
266 | static struct platform_driver arc_ps2_driver = { |
267 | .driver = { | |
2c0a4f8b | 268 | .name = "arc_ps2", |
2c0a4f8b | 269 | .of_match_table = of_match_ptr(arc_ps2_match), |
e4b29009 MJ |
270 | }, |
271 | .probe = arc_ps2_probe, | |
1cb0aa88 | 272 | .remove = arc_ps2_remove, |
e4b29009 MJ |
273 | }; |
274 | ||
275 | module_platform_driver(arc_ps2_driver); | |
276 | ||
277 | MODULE_LICENSE("GPL"); | |
278 | MODULE_AUTHOR("Pavel Sokolov <psokolov@synopsys.com>"); | |
279 | MODULE_DESCRIPTION("ARC PS/2 Driver"); |