summaryrefslogtreecommitdiff
path: root/drivers/mfd/ipaq-micro.c
blob: cd762d08f116f1edfa18678ec24413e3eab078b3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
/*
 * Compaq iPAQ h3xxx Atmel microcontroller companion support
 *
 * This is an Atmel AT90LS8535 with a special flashed-in firmware that
 * implements the special protocol used by this driver.
 *
 * based on previous kernel 2.4 version by Andrew Christian
 * Author : Alessandro Gardich <gremlin@gremlin.it>
 * Author : Dmitry Artamonow <mad_soft@inbox.ru>
 * Author : Linus Walleij <linus.walleij@linaro.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/pm.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/mfd/core.h>
#include <linux/mfd/ipaq-micro.h>
#include <linux/string.h>
#include <linux/random.h>
#include <linux/slab.h>
#include <linux/list.h>

#include <mach/hardware.h>

static void ipaq_micro_trigger_tx(struct ipaq_micro *micro)
{
	struct ipaq_micro_txdev *tx = &micro->tx;
	struct ipaq_micro_msg *msg = micro->msg;
	int i, bp;
	u8 checksum;
	u32 val;

	bp = 0;
	tx->buf[bp++] = CHAR_SOF;

	checksum = ((msg->id & 0x0f) << 4) | (msg->tx_len & 0x0f);
	tx->buf[bp++] = checksum;

	for (i = 0; i < msg->tx_len; i++) {
		tx->buf[bp++] = msg->tx_data[i];
		checksum += msg->tx_data[i];
	}

	tx->buf[bp++] = checksum;
	tx->len = bp;
	tx->index = 0;

	/* Enable interrupt */
	val = readl(micro->base + UTCR3);
	val |= UTCR3_TIE;
	writel(val, micro->base + UTCR3);
}

int ipaq_micro_tx_msg(struct ipaq_micro *micro, struct ipaq_micro_msg *msg)
{
	unsigned long flags;

	dev_dbg(micro->dev, "TX msg: %02x, %d bytes\n", msg->id, msg->tx_len);

	spin_lock_irqsave(&micro->lock, flags);
	if (micro->msg) {
		list_add_tail(&msg->node, &micro->queue);
		spin_unlock_irqrestore(&micro->lock, flags);
		return 0;
	}
	micro->msg = msg;
	ipaq_micro_trigger_tx(micro);
	spin_unlock_irqrestore(&micro->lock, flags);
	return 0;
}
EXPORT_SYMBOL(ipaq_micro_tx_msg);

static void micro_rx_msg(struct ipaq_micro *micro, u8 id, int len, u8 *data)
{
	int i;

	dev_dbg(micro->dev, "RX msg: %02x, %d bytes\n", id, len);

	spin_lock(&micro->lock);
	switch (id) {
	case MSG_VERSION:
	case MSG_EEPROM_READ:
	case MSG_EEPROM_WRITE:
	case MSG_BACKLIGHT:
	case MSG_NOTIFY_LED:
	case MSG_THERMAL_SENSOR:
	case MSG_BATTERY:
		/* Handle synchronous messages */
		if (micro->msg && micro->msg->id == id) {
			struct ipaq_micro_msg *msg = micro->msg;

			memcpy(msg->rx_data, data, len);
			msg->rx_len = len;
			complete(&micro->msg->ack);
			if (!list_empty(&micro->queue)) {
				micro->msg = list_entry(micro->queue.next,
							struct ipaq_micro_msg,
							node);
				list_del_init(&micro->msg->node);
				ipaq_micro_trigger_tx(micro);
			} else
				micro->msg = NULL;
			dev_dbg(micro->dev, "OK RX message 0x%02x\n", id);
		} else {
			dev_err(micro->dev,
				"out of band RX message 0x%02x\n", id);
			if (!micro->msg)
				dev_info(micro->dev, "no message queued\n");
			else
				dev_info(micro->dev, "expected message %02x\n",
					 micro->msg->id);
		}
		break;
	case MSG_KEYBOARD:
		if (micro->key)
			micro->key(micro->key_data, len, data);
		else
			dev_dbg(micro->dev, "key message ignored, no handle\n");
		break;
	case MSG_TOUCHSCREEN:
		if (micro->ts)
			micro->ts(micro->ts_data, len, data);
		else
			dev_dbg(micro->dev, "touchscreen message ignored, no handle\n");
		break;
	default:
		dev_err(micro->dev,
			"unknown msg %d [%d] ", id, len);
		for (i = 0; i < len; ++i)
			pr_cont("0x%02x ", data[i]);
		pr_cont("\n");
	}
	spin_unlock(&micro->lock);
}

static void micro_process_char(struct ipaq_micro *micro, u8 ch)
{
	struct ipaq_micro_rxdev *rx = &micro->rx;

	switch (rx->state) {
	case STATE_SOF:	/* Looking for SOF */
		if (ch == CHAR_SOF)
			rx->state = STATE_ID; /* Next byte is the id and len */
		break;
	case STATE_ID: /* Looking for id and len byte */
		rx->id = (ch & 0xf0) >> 4;
		rx->len = (ch & 0x0f);
		rx->index = 0;
		rx->chksum = ch;
		rx->state = (rx->len > 0) ? STATE_DATA : STATE_CHKSUM;
		break;
	case STATE_DATA: /* Looking for 'len' data bytes */
		rx->chksum += ch;
		rx->buf[rx->index] = ch;
		if (++rx->index == rx->len)
			rx->state = STATE_CHKSUM;
		break;
	case STATE_CHKSUM: /* Looking for the checksum */
		if (ch == rx->chksum)
			micro_rx_msg(micro, rx->id, rx->len, rx->buf);
		rx->state = STATE_SOF;
		break;
	}
}

static void micro_rx_chars(struct ipaq_micro *micro)
{
	u32 status, ch;

	while ((status = readl(micro->base + UTSR1)) & UTSR1_RNE) {
		ch = readl(micro->base + UTDR);
		if (status & UTSR1_PRE)
			dev_err(micro->dev, "rx: parity error\n");
		else if (status & UTSR1_FRE)
			dev_err(micro->dev, "rx: framing error\n");
		else if (status & UTSR1_ROR)
			dev_err(micro->dev, "rx: overrun error\n");
		micro_process_char(micro, ch);
	}
}

static void ipaq_micro_get_version(struct ipaq_micro *micro)
{
	struct ipaq_micro_msg msg = {
		.id = MSG_VERSION,
	};

	ipaq_micro_tx_msg_sync(micro, &msg);
	if (msg.rx_len == 4) {
		memcpy(micro->version, msg.rx_data, 4);
		micro->version[4] = '\0';
	} else if (msg.rx_len == 9) {
		memcpy(micro->version, msg.rx_data, 4);
		micro->version[4] = '\0';
		/* Bytes 4-7 are "pack", byte 8 is "boot type" */
	} else {
		dev_err(micro->dev,
			"illegal version message %d bytes\n", msg.rx_len);
	}
}

static void ipaq_micro_eeprom_read(struct ipaq_micro *micro,
				   u8 address, u8 len, u8 *data)
{
	struct ipaq_micro_msg msg = {
		.id = MSG_EEPROM_READ,
	};
	u8 i;

	for (i = 0; i < len; i++) {
		msg.tx_data[0] = address + i;
		msg.tx_data[1] = 1;
		msg.tx_len = 2;
		ipaq_micro_tx_msg_sync(micro, &msg);
		memcpy(data + (i * 2), msg.rx_data, 2);
	}
}

static char *ipaq_micro_str(u8 *wchar, u8 len)
{
	char retstr[256];
	u8 i;

	for (i = 0; i < len / 2; i++)
		retstr[i] = wchar[i * 2];
	return kstrdup(retstr, GFP_KERNEL);
}

static u16 ipaq_micro_to_u16(u8 *data)
{
	return data[1] << 8 | data[0];
}

static void __init ipaq_micro_eeprom_dump(struct ipaq_micro *micro)
{
	u8 dump[256];
	char *str;

	ipaq_micro_eeprom_read(micro, 0, 128, dump);
	str = ipaq_micro_str(dump, 10);
	if (str) {
		dev_info(micro->dev, "HW version %s\n", str);
		kfree(str);
	}
	str = ipaq_micro_str(dump+10, 40);
	if (str) {
		dev_info(micro->dev, "serial number: %s\n", str);
		/* Feed the random pool with this */
		add_device_randomness(str, strlen(str));
		kfree(str);
	}
	str = ipaq_micro_str(dump+50, 20);
	if (str) {
		dev_info(micro->dev, "module ID: %s\n", str);
		kfree(str);
	}
	str = ipaq_micro_str(dump+70, 10);
	if (str) {
		dev_info(micro->dev, "product revision: %s\n", str);
		kfree(str);
	}
	dev_info(micro->dev, "product ID: %u\n", ipaq_micro_to_u16(dump+80));
	dev_info(micro->dev, "frame rate: %u fps\n",
		 ipaq_micro_to_u16(dump+82));
	dev_info(micro->dev, "page mode: %u\n", ipaq_micro_to_u16(dump+84));
	dev_info(micro->dev, "country ID: %u\n", ipaq_micro_to_u16(dump+86));
	dev_info(micro->dev, "color display: %s\n",
		 ipaq_micro_to_u16(dump+88) ? "yes" : "no");
	dev_info(micro->dev, "ROM size: %u MiB\n", ipaq_micro_to_u16(dump+90));
	dev_info(micro->dev, "RAM size: %u KiB\n", ipaq_micro_to_u16(dump+92));
	dev_info(micro->dev, "screen: %u x %u\n",
		 ipaq_micro_to_u16(dump+94), ipaq_micro_to_u16(dump+96));
}

static void micro_tx_chars(struct ipaq_micro *micro)
{
	struct ipaq_micro_txdev *tx = &micro->tx;
	u32 val;

	while ((tx->index < tx->len) &&
	       (readl(micro->base + UTSR1) & UTSR1_TNF)) {
		writel(tx->buf[tx->index], micro->base + UTDR);
		tx->index++;
	}

	/* Stop interrupts */
	val = readl(micro->base + UTCR3);
	val &= ~UTCR3_TIE;
	writel(val, micro->base + UTCR3);
}

static void micro_reset_comm(struct ipaq_micro *micro)
{
	struct ipaq_micro_rxdev *rx = &micro->rx;
	u32 val;

	if (micro->msg)
		complete(&micro->msg->ack);

	/* Initialize Serial channel protocol frame */
	rx->state = STATE_SOF;  /* Reset the state machine */

	/* Set up interrupts */
	writel(0x01, micro->sdlc + 0x0); /* Select UART mode */

	/* Clean up CR3 */
	writel(0x0, micro->base + UTCR3);

	/* Format: 8N1 */
	writel(UTCR0_8BitData | UTCR0_1StpBit, micro->base + UTCR0);

	/* Baud rate: 115200 */
	writel(0x0, micro->base + UTCR1);
	writel(0x1, micro->base + UTCR2);

	/* Clear SR0 */
	writel(0xff, micro->base + UTSR0);

	/* Enable RX int, disable TX int */
	writel(UTCR3_TXE | UTCR3_RXE | UTCR3_RIE, micro->base + UTCR3);
	val = readl(micro->base + UTCR3);
	val &= ~UTCR3_TIE;
	writel(val, micro->base + UTCR3);
}

static irqreturn_t micro_serial_isr(int irq, void *dev_id)
{
	struct ipaq_micro *micro = dev_id;
	struct ipaq_micro_txdev *tx = &micro->tx;
	u32 status;

	status = readl(micro->base + UTSR0);
	do {
		if (status & (UTSR0_RID | UTSR0_RFS)) {
			if (status & UTSR0_RID)
				/* Clear the Receiver IDLE bit */
				writel(UTSR0_RID, micro->base + UTSR0);
			micro_rx_chars(micro);
		}

		/* Clear break bits */
		if (status & (UTSR0_RBB | UTSR0_REB))
			writel(status & (UTSR0_RBB | UTSR0_REB),
			       micro->base + UTSR0);

		if (status & UTSR0_TFS)
			micro_tx_chars(micro);

		status = readl(micro->base + UTSR0);

	} while (((tx->index < tx->len) && (status & UTSR0_TFS)) ||
		 (status & (UTSR0_RFS | UTSR0_RID)));

	return IRQ_HANDLED;
}

static const struct mfd_cell micro_cells[] = {
	{ .name = "ipaq-micro-backlight", },
	{ .name = "ipaq-micro-battery", },
	{ .name = "ipaq-micro-keys", },
	{ .name = "ipaq-micro-ts", },
	{ .name = "ipaq-micro-leds", },
};

static int __maybe_unused micro_resume(struct device *dev)
{
	struct ipaq_micro *micro = dev_get_drvdata(dev);

	micro_reset_comm(micro);
	mdelay(10);

	return 0;
}

static int __init micro_probe(struct platform_device *pdev)
{
	struct ipaq_micro *micro;
	struct resource *res;
	int ret;
	int irq;

	micro = devm_kzalloc(&pdev->dev, sizeof(*micro), GFP_KERNEL);
	if (!micro)
		return -ENOMEM;

	micro->dev = &pdev->dev;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	micro->base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(micro->base))
		return PTR_ERR(micro->base);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	if (!res)
		return -EINVAL;

	micro->sdlc = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(micro->sdlc))
		return PTR_ERR(micro->sdlc);

	micro_reset_comm(micro);

	irq = platform_get_irq(pdev, 0);
	if (!irq)
		return -EINVAL;
	ret = devm_request_irq(&pdev->dev, irq, micro_serial_isr,
			       IRQF_SHARED, "ipaq-micro",
			       micro);
	if (ret) {
		dev_err(&pdev->dev, "unable to grab serial port IRQ\n");
		return ret;
	} else
		dev_info(&pdev->dev, "grabbed serial port IRQ\n");

	spin_lock_init(&micro->lock);
	INIT_LIST_HEAD(&micro->queue);
	platform_set_drvdata(pdev, micro);

	ret = mfd_add_devices(&pdev->dev, pdev->id, micro_cells,
			      ARRAY_SIZE(micro_cells), NULL, 0, NULL);
	if (ret) {
		dev_err(&pdev->dev, "error adding MFD cells");
		return ret;
	}

	/* Check version */
	ipaq_micro_get_version(micro);
	dev_info(&pdev->dev, "Atmel micro ASIC version %s\n", micro->version);
	ipaq_micro_eeprom_dump(micro);

	return 0;
}

static const struct dev_pm_ops micro_dev_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(NULL, micro_resume)
};

static struct platform_driver micro_device_driver = {
	.driver   = {
		.name	= "ipaq-h3xxx-micro",
		.pm	= &micro_dev_pm_ops,
		.suppress_bind_attrs = true,
	},
};
builtin_platform_driver_probe(micro_device_driver, micro_probe);