1 /*
2 * linux/drivers/input/serio/sa1111ps2.c
3 *
4 * Copyright (C) 2002 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License.
9 */
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/input.h>
13 #include <linux/serio.h>
14 #include <linux/errno.h>
15 #include <linux/interrupt.h>
16 #include <linux/ioport.h>
17 #include <linux/delay.h>
18 #include <linux/device.h>
19 #include <linux/slab.h>
20 #include <linux/spinlock.h>
21
22 #include <asm/io.h>
23 #include <asm/system.h>
24
25 #include <asm/hardware/sa1111.h>
26
27 struct ps2if {
28 struct serio *io;
29 struct sa1111_dev *dev;
30 void __iomem *base;
31 unsigned int open;
32 spinlock_t lock;
33 unsigned int head;
34 unsigned int tail;
35 unsigned char buf[4];
36 };
37
38 /*
39 * Read all bytes waiting in the PS2 port. There should be
40 * at the most one, but we loop for safety. If there was a
41 * framing error, we have to manually clear the status.
42 */
43 static irqreturn_t ps2_rxint(int irq, void *dev_id)
44 {
45 struct ps2if *ps2if = dev_id;
46 unsigned int scancode, flag, status;
47
48 status = sa1111_readl(ps2if->base + SA1111_PS2STAT);
49 while (status & PS2STAT_RXF) {
50 if (status & PS2STAT_STP)
51 sa1111_writel(PS2STAT_STP, ps2if->base + SA1111_PS2STAT);
52
53 flag = (status & PS2STAT_STP ? SERIO_FRAME : 0) |
54 (status & PS2STAT_RXP ? 0 : SERIO_PARITY);
55
56 scancode = sa1111_readl(ps2if->base + SA1111_PS2DATA) & 0xff;
57
58 if (hweight8(scancode) & 1)
59 flag ^= SERIO_PARITY;
60
61 serio_interrupt(ps2if->io, scancode, flag);
62
63 status = sa1111_readl(ps2if->base + SA1111_PS2STAT);
64 }
65
66 return IRQ_HANDLED;
67 }
68
69 /*
70 * Completion of ps2 write
71 */
72 static irqreturn_t ps2_txint(int irq, void *dev_id)
73 {
74 struct ps2if *ps2if = dev_id;
75 unsigned int status;
76
77 spin_lock(&ps2if->lock);
78 status = sa1111_readl(ps2if->base + SA1111_PS2STAT);
79 if (ps2if->head == ps2if->tail) {
80 disable_irq_nosync(irq);
81 /* done */
82 } else if (status & PS2STAT_TXE) {
83 sa1111_writel(ps2if->buf[ps2if->tail], ps2if->base + SA1111_PS2DATA);
84 ps2if->tail = (ps2if->tail + 1) & (sizeof(ps2if->buf) - 1);
85 }
86 spin_unlock(&ps2if->lock);
87
88 return IRQ_HANDLED;
89 }
90
91 /*
92 * Write a byte to the PS2 port. We have to wait for the
93 * port to indicate that the transmitter is empty.
94 */
95 static int ps2_write(struct serio *io, unsigned char val)
96 {
97 struct ps2if *ps2if = io->port_data;
98 unsigned long flags;
99 unsigned int head;
100
101 spin_lock_irqsave(&ps2if->lock, flags);
102
103 /*
104 * If the TX register is empty, we can go straight out.
105 */
106 if (sa1111_readl(ps2if->base + SA1111_PS2STAT) & PS2STAT_TXE) {
107 sa1111_writel(val, ps2if->base + SA1111_PS2DATA);
108 } else {
109 if (ps2if->head == ps2if->tail)
110 enable_irq(ps2if->dev->irq[1]);
111 head = (ps2if->head + 1) & (sizeof(ps2if->buf) - 1);
112 if (head != ps2if->tail) {
113 ps2if->buf[ps2if->head] = val;
114 ps2if->head = head;
115 }
116 }
117
118 spin_unlock_irqrestore(&ps2if->lock, flags);
119 return 0;
120 }
121
122 static int ps2_open(struct serio *io)
123 {
124 struct ps2if *ps2if = io->port_data;
125 int ret;
126
127 sa1111_enable_device(ps2if->dev);
128
129 ret = request_irq(ps2if->dev->irq[0], ps2_rxint, 0,
130 SA1111_DRIVER_NAME(ps2if->dev), ps2if);
131 if (ret) {
132 printk(KERN_ERR "sa1111ps2: could not allocate IRQ%d: %d\n",
133 ps2if->dev->irq[0], ret);
134 return ret;
135 }
136
137 ret = request_irq(ps2if->dev->irq[1], ps2_txint, 0,
138 SA1111_DRIVER_NAME(ps2if->dev), ps2if);
139 if (ret) {
140 printk(KERN_ERR "sa1111ps2: could not allocate IRQ%d: %d\n",
141 ps2if->dev->irq[1], ret);
142 free_irq(ps2if->dev->irq[0], ps2if);
143 return ret;
144 }
145
146 ps2if->open = 1;
147
148 enable_irq_wake(ps2if->dev->irq[0]);
149
150 sa1111_writel(PS2CR_ENA, ps2if->base + SA1111_PS2CR);
151 return 0;
152 }
153
154 static void ps2_close(struct serio *io)
155 {
156 struct ps2if *ps2if = io->port_data;
157
158 sa1111_writel(0, ps2if->base + SA1111_PS2CR);
159
160 disable_irq_wake(ps2if->dev->irq[0]);
161
162 ps2if->open = 0;
163
164 free_irq(ps2if->dev->irq[1], ps2if);
165 free_irq(ps2if->dev->irq[0], ps2if);
166
167 sa1111_disable_device(ps2if->dev);
168 }
169
170 /*
171 * Clear the input buffer.
172 */
173 static void __devinit ps2_clear_input(struct ps2if *ps2if)
174 {
175 int maxread = 100;
176
177 while (maxread--) {
178 if ((sa1111_readl(ps2if->base + SA1111_PS2DATA) & 0xff) == 0xff)
179 break;
180 }
181 }
182
183 static inline unsigned int
184 ps2_test_one(struct ps2if *ps2if, unsigned int mask)
185 {
186 unsigned int val;
187
188 sa1111_writel(PS2CR_ENA | mask, ps2if->base + SA1111_PS2CR);
189
190 udelay(2);
191
192 val = sa1111_readl(ps2if->base + SA1111_PS2STAT);
193 return val & (PS2STAT_KBC | PS2STAT_KBD);
194 }
195
196 /*
197 * Test the keyboard interface. We basically check to make sure that
198 * we can drive each line to the keyboard independently of each other.
199 */
200 static int __init ps2_test(struct ps2if *ps2if)
201 {
202 unsigned int stat;
203 int ret = 0;
204
205 stat = ps2_test_one(ps2if, PS2CR_FKC);
206 if (stat != PS2STAT_KBD) {
207 printk("PS/2 interface test failed[1]: %02x\n", stat);
208 ret = -ENODEV;
209 }
210
211 stat = ps2_test_one(ps2if, 0);
212 if (stat != (PS2STAT_KBC | PS2STAT_KBD)) {
213 printk("PS/2 interface test failed[2]: %02x\n", stat);
214 ret = -ENODEV;
215 }
216
217 stat = ps2_test_one(ps2if, PS2CR_FKD);
218 if (stat != PS2STAT_KBC) {
219 printk("PS/2 interface test failed[3]: %02x\n", stat);
220 ret = -ENODEV;
221 }
222
223 sa1111_writel(0, ps2if->base + SA1111_PS2CR);
224
225 return ret;
226 }
227
228 /*
229 * Add one device to this driver.
230 */
231 static int __devinit ps2_probe(struct sa1111_dev *dev)
232 {
233 struct ps2if *ps2if;
234 struct serio *serio;
235 int ret;
236
237 ps2if = kzalloc(sizeof(struct ps2if), GFP_KERNEL);
238 serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
239 if (!ps2if || !serio) {
240 ret = -ENOMEM;
241 goto free;
242 }
243
244
245 serio->id.type = SERIO_8042;
246 serio->write = ps2_write;
247 serio->open = ps2_open;
248 serio->close = ps2_close;
249 strlcpy(serio->name, dev_name(&dev->dev), sizeof(serio->name));
250 strlcpy(serio->phys, dev_name(&dev->dev), sizeof(serio->phys));
251 serio->port_data = ps2if;
252 serio->dev.parent = &dev->dev;
253 ps2if->io = serio;
254 ps2if->dev = dev;
255 sa1111_set_drvdata(dev, ps2if);
256
257 spin_lock_init(&ps2if->lock);
258
259 /*
260 * Request the physical region for this PS2 port.
261 */
262 if (!request_mem_region(dev->res.start,
263 dev->res.end - dev->res.start + 1,
264 SA1111_DRIVER_NAME(dev))) {
265 ret = -EBUSY;
266 goto free;
267 }
268
269 /*
270 * Our parent device has already mapped the region.
271 */
272 ps2if->base = dev->mapbase;
273
274 sa1111_enable_device(ps2if->dev);
275
276 /* Incoming clock is 8MHz */
277 sa1111_writel(0, ps2if->base + SA1111_PS2CLKDIV);
278 sa1111_writel(127, ps2if->base + SA1111_PS2PRECNT);
279
280 /*
281 * Flush any pending input.
282 */
283 ps2_clear_input(ps2if);
284
285 /*
286 * Test the keyboard interface.
287 */
288 ret = ps2_test(ps2if);
289 if (ret)
290 goto out;
291
292 /*
293 * Flush any pending input.
294 */
295 ps2_clear_input(ps2if);
296
297 sa1111_disable_device(ps2if->dev);
298 serio_register_port(ps2if->io);
299 return 0;
300
301 out:
302 sa1111_disable_device(ps2if->dev);
303 release_mem_region(dev->res.start,
304 dev->res.end - dev->res.start + 1);
305 free:
306 sa1111_set_drvdata(dev, NULL);
307 kfree(ps2if);
308 kfree(serio);
309 return ret;
310 }
311
312 /*
313 * Remove one device from this driver.
314 */
315 static int ps2_remove(struct sa1111_dev *dev)
316 {
317 struct ps2if *ps2if = sa1111_get_drvdata(dev);
318
319 serio_unregister_port(ps2if->io);
320 release_mem_region(dev->res.start,
321 dev->res.end - dev->res.start + 1);
322 sa1111_set_drvdata(dev, NULL);
323
324 kfree(ps2if);
325
326 return 0;
327 }
328
329 /*
330 * Our device driver structure
331 */
332 static struct sa1111_driver ps2_driver = {
333 .drv = {
334 .name = "sa1111-ps2",
335 },
336 .devid = SA1111_DEVID_PS2,
337 .probe = ps2_probe,
338 .remove = ps2_remove,
339 };
340
341 static int __init ps2_init(void)
342 {
343 return sa1111_driver_register(&ps2_driver);
344 }
345
346 static void __exit ps2_exit(void)
347 {
348 sa1111_driver_unregister(&ps2_driver);
349 }
350
351 module_init(ps2_init);
352 module_exit(ps2_exit);
353
354 MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
355 MODULE_DESCRIPTION("SA1111 PS2 controller driver");
356 MODULE_LICENSE("GPL");
357
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