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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/drivers/input/serio/sa1111ps2.c
4 *
5 * Copyright (C) 2002 Russell King
6 */
7#include <linux/module.h>
8#include <linux/init.h>
9#include <linux/input.h>
10#include <linux/serio.h>
11#include <linux/errno.h>
12#include <linux/interrupt.h>
13#include <linux/ioport.h>
14#include <linux/delay.h>
15#include <linux/device.h>
16#include <linux/slab.h>
17#include <linux/spinlock.h>
18
19#include <asm/io.h>
20
21#include <asm/hardware/sa1111.h>
22
23#define PS2CR 0x0000
24#define PS2STAT 0x0004
25#define PS2DATA 0x0008
26#define PS2CLKDIV 0x000c
27#define PS2PRECNT 0x0010
28
29#define PS2CR_ENA 0x08
30#define PS2CR_FKD 0x02
31#define PS2CR_FKC 0x01
32
33#define PS2STAT_STP 0x0100
34#define PS2STAT_TXE 0x0080
35#define PS2STAT_TXB 0x0040
36#define PS2STAT_RXF 0x0020
37#define PS2STAT_RXB 0x0010
38#define PS2STAT_ENA 0x0008
39#define PS2STAT_RXP 0x0004
40#define PS2STAT_KBD 0x0002
41#define PS2STAT_KBC 0x0001
42
43struct ps2if {
44 struct serio *io;
45 struct sa1111_dev *dev;
46 void __iomem *base;
47 int rx_irq;
48 int tx_irq;
49 unsigned int open;
50 spinlock_t lock;
51 unsigned int head;
52 unsigned int tail;
53 unsigned char buf[4];
54};
55
56/*
57 * Read all bytes waiting in the PS2 port. There should be
58 * at the most one, but we loop for safety. If there was a
59 * framing error, we have to manually clear the status.
60 */
61static irqreturn_t ps2_rxint(int irq, void *dev_id)
62{
63 struct ps2if *ps2if = dev_id;
64 unsigned int scancode, flag, status;
65
66 status = readl_relaxed(ps2if->base + PS2STAT);
67 while (status & PS2STAT_RXF) {
68 if (status & PS2STAT_STP)
69 writel_relaxed(PS2STAT_STP, ps2if->base + PS2STAT);
70
71 flag = (status & PS2STAT_STP ? SERIO_FRAME : 0) |
72 (status & PS2STAT_RXP ? 0 : SERIO_PARITY);
73
74 scancode = readl_relaxed(ps2if->base + PS2DATA) & 0xff;
75
76 if (hweight8(scancode) & 1)
77 flag ^= SERIO_PARITY;
78
79 serio_interrupt(ps2if->io, scancode, flag);
80
81 status = readl_relaxed(ps2if->base + PS2STAT);
82 }
83
84 return IRQ_HANDLED;
85}
86
87/*
88 * Completion of ps2 write
89 */
90static irqreturn_t ps2_txint(int irq, void *dev_id)
91{
92 struct ps2if *ps2if = dev_id;
93 unsigned int status;
94
95 spin_lock(&ps2if->lock);
96 status = readl_relaxed(ps2if->base + PS2STAT);
97 if (ps2if->head == ps2if->tail) {
98 disable_irq_nosync(irq);
99 /* done */
100 } else if (status & PS2STAT_TXE) {
101 writel_relaxed(ps2if->buf[ps2if->tail], ps2if->base + PS2DATA);
102 ps2if->tail = (ps2if->tail + 1) & (sizeof(ps2if->buf) - 1);
103 }
104 spin_unlock(&ps2if->lock);
105
106 return IRQ_HANDLED;
107}
108
109/*
110 * Write a byte to the PS2 port. We have to wait for the
111 * port to indicate that the transmitter is empty.
112 */
113static int ps2_write(struct serio *io, unsigned char val)
114{
115 struct ps2if *ps2if = io->port_data;
116 unsigned long flags;
117 unsigned int head;
118
119 spin_lock_irqsave(&ps2if->lock, flags);
120
121 /*
122 * If the TX register is empty, we can go straight out.
123 */
124 if (readl_relaxed(ps2if->base + PS2STAT) & PS2STAT_TXE) {
125 writel_relaxed(val, ps2if->base + PS2DATA);
126 } else {
127 if (ps2if->head == ps2if->tail)
128 enable_irq(ps2if->tx_irq);
129 head = (ps2if->head + 1) & (sizeof(ps2if->buf) - 1);
130 if (head != ps2if->tail) {
131 ps2if->buf[ps2if->head] = val;
132 ps2if->head = head;
133 }
134 }
135
136 spin_unlock_irqrestore(&ps2if->lock, flags);
137 return 0;
138}
139
140static int ps2_open(struct serio *io)
141{
142 struct ps2if *ps2if = io->port_data;
143 int ret;
144
145 ret = sa1111_enable_device(ps2if->dev);
146 if (ret)
147 return ret;
148
149 ret = request_irq(ps2if->rx_irq, ps2_rxint, 0,
150 SA1111_DRIVER_NAME(ps2if->dev), ps2if);
151 if (ret) {
152 printk(KERN_ERR "sa1111ps2: could not allocate IRQ%d: %d\n",
153 ps2if->rx_irq, ret);
154 sa1111_disable_device(ps2if->dev);
155 return ret;
156 }
157
158 ret = request_irq(ps2if->tx_irq, ps2_txint, 0,
159 SA1111_DRIVER_NAME(ps2if->dev), ps2if);
160 if (ret) {
161 printk(KERN_ERR "sa1111ps2: could not allocate IRQ%d: %d\n",
162 ps2if->tx_irq, ret);
163 free_irq(ps2if->rx_irq, ps2if);
164 sa1111_disable_device(ps2if->dev);
165 return ret;
166 }
167
168 ps2if->open = 1;
169
170 enable_irq_wake(ps2if->rx_irq);
171
172 writel_relaxed(PS2CR_ENA, ps2if->base + PS2CR);
173 return 0;
174}
175
176static void ps2_close(struct serio *io)
177{
178 struct ps2if *ps2if = io->port_data;
179
180 writel_relaxed(0, ps2if->base + PS2CR);
181
182 disable_irq_wake(ps2if->rx_irq);
183
184 ps2if->open = 0;
185
186 free_irq(ps2if->tx_irq, ps2if);
187 free_irq(ps2if->rx_irq, ps2if);
188
189 sa1111_disable_device(ps2if->dev);
190}
191
192/*
193 * Clear the input buffer.
194 */
195static void ps2_clear_input(struct ps2if *ps2if)
196{
197 int maxread = 100;
198
199 while (maxread--) {
200 if ((readl_relaxed(ps2if->base + PS2DATA) & 0xff) == 0xff)
201 break;
202 }
203}
204
205static unsigned int ps2_test_one(struct ps2if *ps2if,
206 unsigned int mask)
207{
208 unsigned int val;
209
210 writel_relaxed(PS2CR_ENA | mask, ps2if->base + PS2CR);
211
212 udelay(10);
213
214 val = readl_relaxed(ps2if->base + PS2STAT);
215 return val & (PS2STAT_KBC | PS2STAT_KBD);
216}
217
218/*
219 * Test the keyboard interface. We basically check to make sure that
220 * we can drive each line to the keyboard independently of each other.
221 */
222static int ps2_test(struct ps2if *ps2if)
223{
224 unsigned int stat;
225 int ret = 0;
226
227 stat = ps2_test_one(ps2if, PS2CR_FKC);
228 if (stat != PS2STAT_KBD) {
229 printk("PS/2 interface test failed[1]: %02x\n", stat);
230 ret = -ENODEV;
231 }
232
233 stat = ps2_test_one(ps2if, 0);
234 if (stat != (PS2STAT_KBC | PS2STAT_KBD)) {
235 printk("PS/2 interface test failed[2]: %02x\n", stat);
236 ret = -ENODEV;
237 }
238
239 stat = ps2_test_one(ps2if, PS2CR_FKD);
240 if (stat != PS2STAT_KBC) {
241 printk("PS/2 interface test failed[3]: %02x\n", stat);
242 ret = -ENODEV;
243 }
244
245 writel_relaxed(0, ps2if->base + PS2CR);
246
247 return ret;
248}
249
250/*
251 * Add one device to this driver.
252 */
253static int ps2_probe(struct sa1111_dev *dev)
254{
255 struct ps2if *ps2if;
256 struct serio *serio;
257 int ret;
258
259 ps2if = kzalloc(sizeof(struct ps2if), GFP_KERNEL);
260 serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
261 if (!ps2if || !serio) {
262 ret = -ENOMEM;
263 goto free;
264 }
265
266 serio->id.type = SERIO_8042;
267 serio->write = ps2_write;
268 serio->open = ps2_open;
269 serio->close = ps2_close;
270 strscpy(serio->name, dev_name(&dev->dev), sizeof(serio->name));
271 strscpy(serio->phys, dev_name(&dev->dev), sizeof(serio->phys));
272 serio->port_data = ps2if;
273 serio->dev.parent = &dev->dev;
274 ps2if->io = serio;
275 ps2if->dev = dev;
276 sa1111_set_drvdata(dev, ps2if);
277
278 spin_lock_init(&ps2if->lock);
279
280 ps2if->rx_irq = sa1111_get_irq(dev, 0);
281 if (ps2if->rx_irq <= 0) {
282 ret = ps2if->rx_irq ? : -ENXIO;
283 goto free;
284 }
285
286 ps2if->tx_irq = sa1111_get_irq(dev, 1);
287 if (ps2if->tx_irq <= 0) {
288 ret = ps2if->tx_irq ? : -ENXIO;
289 goto free;
290 }
291
292 /*
293 * Request the physical region for this PS2 port.
294 */
295 if (!request_mem_region(dev->res.start,
296 dev->res.end - dev->res.start + 1,
297 SA1111_DRIVER_NAME(dev))) {
298 ret = -EBUSY;
299 goto free;
300 }
301
302 /*
303 * Our parent device has already mapped the region.
304 */
305 ps2if->base = dev->mapbase;
306
307 sa1111_enable_device(ps2if->dev);
308
309 /* Incoming clock is 8MHz */
310 writel_relaxed(0, ps2if->base + PS2CLKDIV);
311 writel_relaxed(127, ps2if->base + PS2PRECNT);
312
313 /*
314 * Flush any pending input.
315 */
316 ps2_clear_input(ps2if);
317
318 /*
319 * Test the keyboard interface.
320 */
321 ret = ps2_test(ps2if);
322 if (ret)
323 goto out;
324
325 /*
326 * Flush any pending input.
327 */
328 ps2_clear_input(ps2if);
329
330 sa1111_disable_device(ps2if->dev);
331 serio_register_port(ps2if->io);
332 return 0;
333
334 out:
335 sa1111_disable_device(ps2if->dev);
336 release_mem_region(dev->res.start, resource_size(&dev->res));
337 free:
338 sa1111_set_drvdata(dev, NULL);
339 kfree(ps2if);
340 kfree(serio);
341 return ret;
342}
343
344/*
345 * Remove one device from this driver.
346 */
347static void ps2_remove(struct sa1111_dev *dev)
348{
349 struct ps2if *ps2if = sa1111_get_drvdata(dev);
350
351 serio_unregister_port(ps2if->io);
352 release_mem_region(dev->res.start, resource_size(&dev->res));
353 sa1111_set_drvdata(dev, NULL);
354
355 kfree(ps2if);
356}
357
358/*
359 * Our device driver structure
360 */
361static struct sa1111_driver ps2_driver = {
362 .drv = {
363 .name = "sa1111-ps2",
364 .owner = THIS_MODULE,
365 },
366 .devid = SA1111_DEVID_PS2,
367 .probe = ps2_probe,
368 .remove = ps2_remove,
369};
370
371static int __init ps2_init(void)
372{
373 return sa1111_driver_register(&ps2_driver);
374}
375
376static void __exit ps2_exit(void)
377{
378 sa1111_driver_unregister(&ps2_driver);
379}
380
381module_init(ps2_init);
382module_exit(ps2_exit);
383
384MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
385MODULE_DESCRIPTION("SA1111 PS2 controller driver");
386MODULE_LICENSE("GPL");
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
24#include <asm/hardware/sa1111.h>
25
26#define PS2CR 0x0000
27#define PS2STAT 0x0004
28#define PS2DATA 0x0008
29#define PS2CLKDIV 0x000c
30#define PS2PRECNT 0x0010
31
32#define PS2CR_ENA 0x08
33#define PS2CR_FKD 0x02
34#define PS2CR_FKC 0x01
35
36#define PS2STAT_STP 0x0100
37#define PS2STAT_TXE 0x0080
38#define PS2STAT_TXB 0x0040
39#define PS2STAT_RXF 0x0020
40#define PS2STAT_RXB 0x0010
41#define PS2STAT_ENA 0x0008
42#define PS2STAT_RXP 0x0004
43#define PS2STAT_KBD 0x0002
44#define PS2STAT_KBC 0x0001
45
46struct ps2if {
47 struct serio *io;
48 struct sa1111_dev *dev;
49 void __iomem *base;
50 unsigned int open;
51 spinlock_t lock;
52 unsigned int head;
53 unsigned int tail;
54 unsigned char buf[4];
55};
56
57/*
58 * Read all bytes waiting in the PS2 port. There should be
59 * at the most one, but we loop for safety. If there was a
60 * framing error, we have to manually clear the status.
61 */
62static irqreturn_t ps2_rxint(int irq, void *dev_id)
63{
64 struct ps2if *ps2if = dev_id;
65 unsigned int scancode, flag, status;
66
67 status = sa1111_readl(ps2if->base + PS2STAT);
68 while (status & PS2STAT_RXF) {
69 if (status & PS2STAT_STP)
70 sa1111_writel(PS2STAT_STP, ps2if->base + PS2STAT);
71
72 flag = (status & PS2STAT_STP ? SERIO_FRAME : 0) |
73 (status & PS2STAT_RXP ? 0 : SERIO_PARITY);
74
75 scancode = sa1111_readl(ps2if->base + PS2DATA) & 0xff;
76
77 if (hweight8(scancode) & 1)
78 flag ^= SERIO_PARITY;
79
80 serio_interrupt(ps2if->io, scancode, flag);
81
82 status = sa1111_readl(ps2if->base + PS2STAT);
83 }
84
85 return IRQ_HANDLED;
86}
87
88/*
89 * Completion of ps2 write
90 */
91static irqreturn_t ps2_txint(int irq, void *dev_id)
92{
93 struct ps2if *ps2if = dev_id;
94 unsigned int status;
95
96 spin_lock(&ps2if->lock);
97 status = sa1111_readl(ps2if->base + PS2STAT);
98 if (ps2if->head == ps2if->tail) {
99 disable_irq_nosync(irq);
100 /* done */
101 } else if (status & PS2STAT_TXE) {
102 sa1111_writel(ps2if->buf[ps2if->tail], ps2if->base + PS2DATA);
103 ps2if->tail = (ps2if->tail + 1) & (sizeof(ps2if->buf) - 1);
104 }
105 spin_unlock(&ps2if->lock);
106
107 return IRQ_HANDLED;
108}
109
110/*
111 * Write a byte to the PS2 port. We have to wait for the
112 * port to indicate that the transmitter is empty.
113 */
114static int ps2_write(struct serio *io, unsigned char val)
115{
116 struct ps2if *ps2if = io->port_data;
117 unsigned long flags;
118 unsigned int head;
119
120 spin_lock_irqsave(&ps2if->lock, flags);
121
122 /*
123 * If the TX register is empty, we can go straight out.
124 */
125 if (sa1111_readl(ps2if->base + PS2STAT) & PS2STAT_TXE) {
126 sa1111_writel(val, ps2if->base + PS2DATA);
127 } else {
128 if (ps2if->head == ps2if->tail)
129 enable_irq(ps2if->dev->irq[1]);
130 head = (ps2if->head + 1) & (sizeof(ps2if->buf) - 1);
131 if (head != ps2if->tail) {
132 ps2if->buf[ps2if->head] = val;
133 ps2if->head = head;
134 }
135 }
136
137 spin_unlock_irqrestore(&ps2if->lock, flags);
138 return 0;
139}
140
141static int ps2_open(struct serio *io)
142{
143 struct ps2if *ps2if = io->port_data;
144 int ret;
145
146 ret = sa1111_enable_device(ps2if->dev);
147 if (ret)
148 return ret;
149
150 ret = request_irq(ps2if->dev->irq[0], ps2_rxint, 0,
151 SA1111_DRIVER_NAME(ps2if->dev), ps2if);
152 if (ret) {
153 printk(KERN_ERR "sa1111ps2: could not allocate IRQ%d: %d\n",
154 ps2if->dev->irq[0], ret);
155 sa1111_disable_device(ps2if->dev);
156 return ret;
157 }
158
159 ret = request_irq(ps2if->dev->irq[1], ps2_txint, 0,
160 SA1111_DRIVER_NAME(ps2if->dev), ps2if);
161 if (ret) {
162 printk(KERN_ERR "sa1111ps2: could not allocate IRQ%d: %d\n",
163 ps2if->dev->irq[1], ret);
164 free_irq(ps2if->dev->irq[0], ps2if);
165 sa1111_disable_device(ps2if->dev);
166 return ret;
167 }
168
169 ps2if->open = 1;
170
171 enable_irq_wake(ps2if->dev->irq[0]);
172
173 sa1111_writel(PS2CR_ENA, ps2if->base + PS2CR);
174 return 0;
175}
176
177static void ps2_close(struct serio *io)
178{
179 struct ps2if *ps2if = io->port_data;
180
181 sa1111_writel(0, ps2if->base + PS2CR);
182
183 disable_irq_wake(ps2if->dev->irq[0]);
184
185 ps2if->open = 0;
186
187 free_irq(ps2if->dev->irq[1], ps2if);
188 free_irq(ps2if->dev->irq[0], ps2if);
189
190 sa1111_disable_device(ps2if->dev);
191}
192
193/*
194 * Clear the input buffer.
195 */
196static void __devinit ps2_clear_input(struct ps2if *ps2if)
197{
198 int maxread = 100;
199
200 while (maxread--) {
201 if ((sa1111_readl(ps2if->base + PS2DATA) & 0xff) == 0xff)
202 break;
203 }
204}
205
206static unsigned int __devinit ps2_test_one(struct ps2if *ps2if,
207 unsigned int mask)
208{
209 unsigned int val;
210
211 sa1111_writel(PS2CR_ENA | mask, ps2if->base + PS2CR);
212
213 udelay(2);
214
215 val = sa1111_readl(ps2if->base + PS2STAT);
216 return val & (PS2STAT_KBC | PS2STAT_KBD);
217}
218
219/*
220 * Test the keyboard interface. We basically check to make sure that
221 * we can drive each line to the keyboard independently of each other.
222 */
223static int __devinit ps2_test(struct ps2if *ps2if)
224{
225 unsigned int stat;
226 int ret = 0;
227
228 stat = ps2_test_one(ps2if, PS2CR_FKC);
229 if (stat != PS2STAT_KBD) {
230 printk("PS/2 interface test failed[1]: %02x\n", stat);
231 ret = -ENODEV;
232 }
233
234 stat = ps2_test_one(ps2if, 0);
235 if (stat != (PS2STAT_KBC | PS2STAT_KBD)) {
236 printk("PS/2 interface test failed[2]: %02x\n", stat);
237 ret = -ENODEV;
238 }
239
240 stat = ps2_test_one(ps2if, PS2CR_FKD);
241 if (stat != PS2STAT_KBC) {
242 printk("PS/2 interface test failed[3]: %02x\n", stat);
243 ret = -ENODEV;
244 }
245
246 sa1111_writel(0, ps2if->base + PS2CR);
247
248 return ret;
249}
250
251/*
252 * Add one device to this driver.
253 */
254static int __devinit ps2_probe(struct sa1111_dev *dev)
255{
256 struct ps2if *ps2if;
257 struct serio *serio;
258 int ret;
259
260 ps2if = kzalloc(sizeof(struct ps2if), GFP_KERNEL);
261 serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
262 if (!ps2if || !serio) {
263 ret = -ENOMEM;
264 goto free;
265 }
266
267
268 serio->id.type = SERIO_8042;
269 serio->write = ps2_write;
270 serio->open = ps2_open;
271 serio->close = ps2_close;
272 strlcpy(serio->name, dev_name(&dev->dev), sizeof(serio->name));
273 strlcpy(serio->phys, dev_name(&dev->dev), sizeof(serio->phys));
274 serio->port_data = ps2if;
275 serio->dev.parent = &dev->dev;
276 ps2if->io = serio;
277 ps2if->dev = dev;
278 sa1111_set_drvdata(dev, ps2if);
279
280 spin_lock_init(&ps2if->lock);
281
282 /*
283 * Request the physical region for this PS2 port.
284 */
285 if (!request_mem_region(dev->res.start,
286 dev->res.end - dev->res.start + 1,
287 SA1111_DRIVER_NAME(dev))) {
288 ret = -EBUSY;
289 goto free;
290 }
291
292 /*
293 * Our parent device has already mapped the region.
294 */
295 ps2if->base = dev->mapbase;
296
297 sa1111_enable_device(ps2if->dev);
298
299 /* Incoming clock is 8MHz */
300 sa1111_writel(0, ps2if->base + PS2CLKDIV);
301 sa1111_writel(127, ps2if->base + PS2PRECNT);
302
303 /*
304 * Flush any pending input.
305 */
306 ps2_clear_input(ps2if);
307
308 /*
309 * Test the keyboard interface.
310 */
311 ret = ps2_test(ps2if);
312 if (ret)
313 goto out;
314
315 /*
316 * Flush any pending input.
317 */
318 ps2_clear_input(ps2if);
319
320 sa1111_disable_device(ps2if->dev);
321 serio_register_port(ps2if->io);
322 return 0;
323
324 out:
325 sa1111_disable_device(ps2if->dev);
326 release_mem_region(dev->res.start, resource_size(&dev->res));
327 free:
328 sa1111_set_drvdata(dev, NULL);
329 kfree(ps2if);
330 kfree(serio);
331 return ret;
332}
333
334/*
335 * Remove one device from this driver.
336 */
337static int __devexit ps2_remove(struct sa1111_dev *dev)
338{
339 struct ps2if *ps2if = sa1111_get_drvdata(dev);
340
341 serio_unregister_port(ps2if->io);
342 release_mem_region(dev->res.start, resource_size(&dev->res));
343 sa1111_set_drvdata(dev, NULL);
344
345 kfree(ps2if);
346
347 return 0;
348}
349
350/*
351 * Our device driver structure
352 */
353static struct sa1111_driver ps2_driver = {
354 .drv = {
355 .name = "sa1111-ps2",
356 .owner = THIS_MODULE,
357 },
358 .devid = SA1111_DEVID_PS2,
359 .probe = ps2_probe,
360 .remove = __devexit_p(ps2_remove),
361};
362
363static int __init ps2_init(void)
364{
365 return sa1111_driver_register(&ps2_driver);
366}
367
368static void __exit ps2_exit(void)
369{
370 sa1111_driver_unregister(&ps2_driver);
371}
372
373module_init(ps2_init);
374module_exit(ps2_exit);
375
376MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
377MODULE_DESCRIPTION("SA1111 PS2 controller driver");
378MODULE_LICENSE("GPL");