1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Compaq iPAQ h3xxx Atmel microcontroller companion support
  4 *
  5 * This is an Atmel AT90LS8535 with a special flashed-in firmware that
  6 * implements the special protocol used by this driver.
  7 *
  8 * based on previous kernel 2.4 version by Andrew Christian
  9 * Author : Alessandro Gardich <gremlin@gremlin.it>
 10 * Author : Dmitry Artamonow <mad_soft@inbox.ru>
 11 * Author : Linus Walleij <linus.walleij@linaro.org>
 
 
 
 
 12 */
 13
 14#include <linux/module.h>
 15#include <linux/init.h>
 16#include <linux/interrupt.h>
 17#include <linux/pm.h>
 18#include <linux/delay.h>
 19#include <linux/device.h>
 20#include <linux/platform_device.h>
 21#include <linux/io.h>
 22#include <linux/mfd/core.h>
 23#include <linux/mfd/ipaq-micro.h>
 24#include <linux/string.h>
 25#include <linux/random.h>
 26#include <linux/slab.h>
 27#include <linux/list.h>
 28
 29#include <mach/hardware.h>
 30
 31static void ipaq_micro_trigger_tx(struct ipaq_micro *micro)
 32{
 33	struct ipaq_micro_txdev *tx = &micro->tx;
 34	struct ipaq_micro_msg *msg = micro->msg;
 35	int i, bp;
 36	u8 checksum;
 37	u32 val;
 38
 39	bp = 0;
 40	tx->buf[bp++] = CHAR_SOF;
 41
 42	checksum = ((msg->id & 0x0f) << 4) | (msg->tx_len & 0x0f);
 43	tx->buf[bp++] = checksum;
 44
 45	for (i = 0; i < msg->tx_len; i++) {
 46		tx->buf[bp++] = msg->tx_data[i];
 47		checksum += msg->tx_data[i];
 48	}
 49
 50	tx->buf[bp++] = checksum;
 51	tx->len = bp;
 52	tx->index = 0;
 53
 54	/* Enable interrupt */
 55	val = readl(micro->base + UTCR3);
 56	val |= UTCR3_TIE;
 57	writel(val, micro->base + UTCR3);
 58}
 59
 60int ipaq_micro_tx_msg(struct ipaq_micro *micro, struct ipaq_micro_msg *msg)
 61{
 62	unsigned long flags;
 63
 64	dev_dbg(micro->dev, "TX msg: %02x, %d bytes\n", msg->id, msg->tx_len);
 65
 66	spin_lock_irqsave(&micro->lock, flags);
 67	if (micro->msg) {
 68		list_add_tail(&msg->node, &micro->queue);
 69		spin_unlock_irqrestore(&micro->lock, flags);
 70		return 0;
 71	}
 72	micro->msg = msg;
 73	ipaq_micro_trigger_tx(micro);
 74	spin_unlock_irqrestore(&micro->lock, flags);
 75	return 0;
 76}
 77EXPORT_SYMBOL(ipaq_micro_tx_msg);
 78
 79static void micro_rx_msg(struct ipaq_micro *micro, u8 id, int len, u8 *data)
 80{
 
 
 81	dev_dbg(micro->dev, "RX msg: %02x, %d bytes\n", id, len);
 82
 83	spin_lock(&micro->lock);
 84	switch (id) {
 85	case MSG_VERSION:
 86	case MSG_EEPROM_READ:
 87	case MSG_EEPROM_WRITE:
 88	case MSG_BACKLIGHT:
 89	case MSG_NOTIFY_LED:
 90	case MSG_THERMAL_SENSOR:
 91	case MSG_BATTERY:
 92		/* Handle synchronous messages */
 93		if (micro->msg && micro->msg->id == id) {
 94			struct ipaq_micro_msg *msg = micro->msg;
 95
 96			memcpy(msg->rx_data, data, len);
 97			msg->rx_len = len;
 98			complete(&micro->msg->ack);
 99			if (!list_empty(&micro->queue)) {
100				micro->msg = list_entry(micro->queue.next,
101							struct ipaq_micro_msg,
102							node);
103				list_del_init(&micro->msg->node);
104				ipaq_micro_trigger_tx(micro);
105			} else
106				micro->msg = NULL;
107			dev_dbg(micro->dev, "OK RX message 0x%02x\n", id);
108		} else {
109			dev_err(micro->dev,
110				"out of band RX message 0x%02x\n", id);
111			if (!micro->msg)
112				dev_info(micro->dev, "no message queued\n");
113			else
114				dev_info(micro->dev, "expected message %02x\n",
115					 micro->msg->id);
116		}
117		break;
118	case MSG_KEYBOARD:
119		if (micro->key)
120			micro->key(micro->key_data, len, data);
121		else
122			dev_dbg(micro->dev, "key message ignored, no handle\n");
123		break;
124	case MSG_TOUCHSCREEN:
125		if (micro->ts)
126			micro->ts(micro->ts_data, len, data);
127		else
128			dev_dbg(micro->dev, "touchscreen message ignored, no handle\n");
129		break;
130	default:
131		dev_err(micro->dev,
132			"unknown msg %d [%d] %*ph\n", id, len, len, data);
 
 
 
133	}
134	spin_unlock(&micro->lock);
135}
136
137static void micro_process_char(struct ipaq_micro *micro, u8 ch)
138{
139	struct ipaq_micro_rxdev *rx = &micro->rx;
140
141	switch (rx->state) {
142	case STATE_SOF:	/* Looking for SOF */
143		if (ch == CHAR_SOF)
144			rx->state = STATE_ID; /* Next byte is the id and len */
145		break;
146	case STATE_ID: /* Looking for id and len byte */
147		rx->id = (ch & 0xf0) >> 4;
148		rx->len = (ch & 0x0f);
149		rx->index = 0;
150		rx->chksum = ch;
151		rx->state = (rx->len > 0) ? STATE_DATA : STATE_CHKSUM;
152		break;
153	case STATE_DATA: /* Looking for 'len' data bytes */
154		rx->chksum += ch;
155		rx->buf[rx->index] = ch;
156		if (++rx->index == rx->len)
157			rx->state = STATE_CHKSUM;
158		break;
159	case STATE_CHKSUM: /* Looking for the checksum */
160		if (ch == rx->chksum)
161			micro_rx_msg(micro, rx->id, rx->len, rx->buf);
162		rx->state = STATE_SOF;
163		break;
164	}
165}
166
167static void micro_rx_chars(struct ipaq_micro *micro)
168{
169	u32 status, ch;
170
171	while ((status = readl(micro->base + UTSR1)) & UTSR1_RNE) {
172		ch = readl(micro->base + UTDR);
173		if (status & UTSR1_PRE)
174			dev_err(micro->dev, "rx: parity error\n");
175		else if (status & UTSR1_FRE)
176			dev_err(micro->dev, "rx: framing error\n");
177		else if (status & UTSR1_ROR)
178			dev_err(micro->dev, "rx: overrun error\n");
179		micro_process_char(micro, ch);
180	}
181}
182
183static void ipaq_micro_get_version(struct ipaq_micro *micro)
184{
185	struct ipaq_micro_msg msg = {
186		.id = MSG_VERSION,
187	};
188
189	ipaq_micro_tx_msg_sync(micro, &msg);
190	if (msg.rx_len == 4) {
191		memcpy(micro->version, msg.rx_data, 4);
192		micro->version[4] = '\0';
193	} else if (msg.rx_len == 9) {
194		memcpy(micro->version, msg.rx_data, 4);
195		micro->version[4] = '\0';
196		/* Bytes 4-7 are "pack", byte 8 is "boot type" */
197	} else {
198		dev_err(micro->dev,
199			"illegal version message %d bytes\n", msg.rx_len);
200	}
201}
202
203static void ipaq_micro_eeprom_read(struct ipaq_micro *micro,
204				   u8 address, u8 len, u8 *data)
205{
206	struct ipaq_micro_msg msg = {
207		.id = MSG_EEPROM_READ,
208	};
209	u8 i;
210
211	for (i = 0; i < len; i++) {
212		msg.tx_data[0] = address + i;
213		msg.tx_data[1] = 1;
214		msg.tx_len = 2;
215		ipaq_micro_tx_msg_sync(micro, &msg);
216		memcpy(data + (i * 2), msg.rx_data, 2);
217	}
218}
219
220static char *ipaq_micro_str(u8 *wchar, u8 len)
221{
222	char retstr[256];
223	u8 i;
224
225	for (i = 0; i < len / 2; i++)
226		retstr[i] = wchar[i * 2];
227	return kstrdup(retstr, GFP_KERNEL);
228}
229
230static u16 ipaq_micro_to_u16(u8 *data)
231{
232	return data[1] << 8 | data[0];
233}
234
235static void __init ipaq_micro_eeprom_dump(struct ipaq_micro *micro)
236{
237	u8 dump[256];
238	char *str;
239
240	ipaq_micro_eeprom_read(micro, 0, 128, dump);
241	str = ipaq_micro_str(dump, 10);
242	if (str) {
243		dev_info(micro->dev, "HW version %s\n", str);
244		kfree(str);
245	}
246	str = ipaq_micro_str(dump+10, 40);
247	if (str) {
248		dev_info(micro->dev, "serial number: %s\n", str);
249		/* Feed the random pool with this */
250		add_device_randomness(str, strlen(str));
251		kfree(str);
252	}
253	str = ipaq_micro_str(dump+50, 20);
254	if (str) {
255		dev_info(micro->dev, "module ID: %s\n", str);
256		kfree(str);
257	}
258	str = ipaq_micro_str(dump+70, 10);
259	if (str) {
260		dev_info(micro->dev, "product revision: %s\n", str);
261		kfree(str);
262	}
263	dev_info(micro->dev, "product ID: %u\n", ipaq_micro_to_u16(dump+80));
264	dev_info(micro->dev, "frame rate: %u fps\n",
265		 ipaq_micro_to_u16(dump+82));
266	dev_info(micro->dev, "page mode: %u\n", ipaq_micro_to_u16(dump+84));
267	dev_info(micro->dev, "country ID: %u\n", ipaq_micro_to_u16(dump+86));
268	dev_info(micro->dev, "color display: %s\n",
269		 ipaq_micro_to_u16(dump+88) ? "yes" : "no");
270	dev_info(micro->dev, "ROM size: %u MiB\n", ipaq_micro_to_u16(dump+90));
271	dev_info(micro->dev, "RAM size: %u KiB\n", ipaq_micro_to_u16(dump+92));
272	dev_info(micro->dev, "screen: %u x %u\n",
273		 ipaq_micro_to_u16(dump+94), ipaq_micro_to_u16(dump+96));
274}
275
276static void micro_tx_chars(struct ipaq_micro *micro)
277{
278	struct ipaq_micro_txdev *tx = &micro->tx;
279	u32 val;
280
281	while ((tx->index < tx->len) &&
282	       (readl(micro->base + UTSR1) & UTSR1_TNF)) {
283		writel(tx->buf[tx->index], micro->base + UTDR);
284		tx->index++;
285	}
286
287	/* Stop interrupts */
288	val = readl(micro->base + UTCR3);
289	val &= ~UTCR3_TIE;
290	writel(val, micro->base + UTCR3);
291}
292
293static void micro_reset_comm(struct ipaq_micro *micro)
294{
295	struct ipaq_micro_rxdev *rx = &micro->rx;
296	u32 val;
297
298	if (micro->msg)
299		complete(&micro->msg->ack);
300
301	/* Initialize Serial channel protocol frame */
302	rx->state = STATE_SOF;  /* Reset the state machine */
303
304	/* Set up interrupts */
305	writel(0x01, micro->sdlc + 0x0); /* Select UART mode */
306
307	/* Clean up CR3 */
308	writel(0x0, micro->base + UTCR3);
309
310	/* Format: 8N1 */
311	writel(UTCR0_8BitData | UTCR0_1StpBit, micro->base + UTCR0);
312
313	/* Baud rate: 115200 */
314	writel(0x0, micro->base + UTCR1);
315	writel(0x1, micro->base + UTCR2);
316
317	/* Clear SR0 */
318	writel(0xff, micro->base + UTSR0);
319
320	/* Enable RX int, disable TX int */
321	writel(UTCR3_TXE | UTCR3_RXE | UTCR3_RIE, micro->base + UTCR3);
322	val = readl(micro->base + UTCR3);
323	val &= ~UTCR3_TIE;
324	writel(val, micro->base + UTCR3);
325}
326
327static irqreturn_t micro_serial_isr(int irq, void *dev_id)
328{
329	struct ipaq_micro *micro = dev_id;
330	struct ipaq_micro_txdev *tx = &micro->tx;
331	u32 status;
332
333	status = readl(micro->base + UTSR0);
334	do {
335		if (status & (UTSR0_RID | UTSR0_RFS)) {
336			if (status & UTSR0_RID)
337				/* Clear the Receiver IDLE bit */
338				writel(UTSR0_RID, micro->base + UTSR0);
339			micro_rx_chars(micro);
340		}
341
342		/* Clear break bits */
343		if (status & (UTSR0_RBB | UTSR0_REB))
344			writel(status & (UTSR0_RBB | UTSR0_REB),
345			       micro->base + UTSR0);
346
347		if (status & UTSR0_TFS)
348			micro_tx_chars(micro);
349
350		status = readl(micro->base + UTSR0);
351
352	} while (((tx->index < tx->len) && (status & UTSR0_TFS)) ||
353		 (status & (UTSR0_RFS | UTSR0_RID)));
354
355	return IRQ_HANDLED;
356}
357
358static const struct mfd_cell micro_cells[] = {
359	{ .name = "ipaq-micro-backlight", },
360	{ .name = "ipaq-micro-battery", },
361	{ .name = "ipaq-micro-keys", },
362	{ .name = "ipaq-micro-ts", },
363	{ .name = "ipaq-micro-leds", },
364};
365
366static int __maybe_unused micro_resume(struct device *dev)
367{
368	struct ipaq_micro *micro = dev_get_drvdata(dev);
369
370	micro_reset_comm(micro);
371	mdelay(10);
372
373	return 0;
374}
375
376static int __init micro_probe(struct platform_device *pdev)
377{
378	struct ipaq_micro *micro;
 
379	int ret;
380	int irq;
381
382	micro = devm_kzalloc(&pdev->dev, sizeof(*micro), GFP_KERNEL);
383	if (!micro)
384		return -ENOMEM;
385
386	micro->dev = &pdev->dev;
387
388	micro->base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
 
389	if (IS_ERR(micro->base))
390		return PTR_ERR(micro->base);
391
392	micro->sdlc = devm_platform_ioremap_resource(pdev, 1);
 
 
 
 
393	if (IS_ERR(micro->sdlc))
394		return PTR_ERR(micro->sdlc);
395
396	micro_reset_comm(micro);
397
398	irq = platform_get_irq(pdev, 0);
399	if (irq < 0)
400		return -EINVAL;
401	ret = devm_request_irq(&pdev->dev, irq, micro_serial_isr,
402			       IRQF_SHARED, "ipaq-micro",
403			       micro);
404	if (ret) {
405		dev_err(&pdev->dev, "unable to grab serial port IRQ\n");
406		return ret;
407	} else
408		dev_info(&pdev->dev, "grabbed serial port IRQ\n");
409
410	spin_lock_init(&micro->lock);
411	INIT_LIST_HEAD(&micro->queue);
412	platform_set_drvdata(pdev, micro);
413
414	ret = mfd_add_devices(&pdev->dev, pdev->id, micro_cells,
415			      ARRAY_SIZE(micro_cells), NULL, 0, NULL);
416	if (ret) {
417		dev_err(&pdev->dev, "error adding MFD cells");
418		return ret;
419	}
420
421	/* Check version */
422	ipaq_micro_get_version(micro);
423	dev_info(&pdev->dev, "Atmel micro ASIC version %s\n", micro->version);
424	ipaq_micro_eeprom_dump(micro);
425
426	return 0;
427}
428
429static const struct dev_pm_ops micro_dev_pm_ops = {
430	SET_SYSTEM_SLEEP_PM_OPS(NULL, micro_resume)
431};
432
433static struct platform_driver micro_device_driver = {
434	.driver   = {
435		.name	= "ipaq-h3xxx-micro",
436		.pm	= &micro_dev_pm_ops,
437		.suppress_bind_attrs = true,
438	},
439};
440builtin_platform_driver_probe(micro_device_driver, micro_probe);

 
  1/*
  2 * Compaq iPAQ h3xxx Atmel microcontroller companion support
  3 *
  4 * This is an Atmel AT90LS8535 with a special flashed-in firmware that
  5 * implements the special protocol used by this driver.
  6 *
  7 * based on previous kernel 2.4 version by Andrew Christian
  8 * Author : Alessandro Gardich <gremlin@gremlin.it>
  9 * Author : Dmitry Artamonow <mad_soft@inbox.ru>
 10 * Author : Linus Walleij <linus.walleij@linaro.org>
 11 *
 12 * This program is free software; you can redistribute it and/or modify
 13 * it under the terms of the GNU General Public License version 2 as
 14 * published by the Free Software Foundation.
 15 */
 16
 17#include <linux/module.h>
 18#include <linux/init.h>
 19#include <linux/interrupt.h>
 20#include <linux/pm.h>
 21#include <linux/delay.h>
 22#include <linux/device.h>
 23#include <linux/platform_device.h>
 24#include <linux/io.h>
 25#include <linux/mfd/core.h>
 26#include <linux/mfd/ipaq-micro.h>
 27#include <linux/string.h>
 28#include <linux/random.h>
 29#include <linux/slab.h>
 30#include <linux/list.h>
 31
 32#include <mach/hardware.h>
 33
 34static void ipaq_micro_trigger_tx(struct ipaq_micro *micro)
 35{
 36	struct ipaq_micro_txdev *tx = &micro->tx;
 37	struct ipaq_micro_msg *msg = micro->msg;
 38	int i, bp;
 39	u8 checksum;
 40	u32 val;
 41
 42	bp = 0;
 43	tx->buf[bp++] = CHAR_SOF;
 44
 45	checksum = ((msg->id & 0x0f) << 4) | (msg->tx_len & 0x0f);
 46	tx->buf[bp++] = checksum;
 47
 48	for (i = 0; i < msg->tx_len; i++) {
 49		tx->buf[bp++] = msg->tx_data[i];
 50		checksum += msg->tx_data[i];
 51	}
 52
 53	tx->buf[bp++] = checksum;
 54	tx->len = bp;
 55	tx->index = 0;
 56
 57	/* Enable interrupt */
 58	val = readl(micro->base + UTCR3);
 59	val |= UTCR3_TIE;
 60	writel(val, micro->base + UTCR3);
 61}
 62
 63int ipaq_micro_tx_msg(struct ipaq_micro *micro, struct ipaq_micro_msg *msg)
 64{
 65	unsigned long flags;
 66
 67	dev_dbg(micro->dev, "TX msg: %02x, %d bytes\n", msg->id, msg->tx_len);
 68
 69	spin_lock_irqsave(&micro->lock, flags);
 70	if (micro->msg) {
 71		list_add_tail(&msg->node, &micro->queue);
 72		spin_unlock_irqrestore(&micro->lock, flags);
 73		return 0;
 74	}
 75	micro->msg = msg;
 76	ipaq_micro_trigger_tx(micro);
 77	spin_unlock_irqrestore(&micro->lock, flags);
 78	return 0;
 79}
 80EXPORT_SYMBOL(ipaq_micro_tx_msg);
 81
 82static void micro_rx_msg(struct ipaq_micro *micro, u8 id, int len, u8 *data)
 83{
 84	int i;
 85
 86	dev_dbg(micro->dev, "RX msg: %02x, %d bytes\n", id, len);
 87
 88	spin_lock(&micro->lock);
 89	switch (id) {
 90	case MSG_VERSION:
 91	case MSG_EEPROM_READ:
 92	case MSG_EEPROM_WRITE:
 93	case MSG_BACKLIGHT:
 94	case MSG_NOTIFY_LED:
 95	case MSG_THERMAL_SENSOR:
 96	case MSG_BATTERY:
 97		/* Handle synchronous messages */
 98		if (micro->msg && micro->msg->id == id) {
 99			struct ipaq_micro_msg *msg = micro->msg;
100
101			memcpy(msg->rx_data, data, len);
102			msg->rx_len = len;
103			complete(&micro->msg->ack);
104			if (!list_empty(&micro->queue)) {
105				micro->msg = list_entry(micro->queue.next,
106							struct ipaq_micro_msg,
107							node);
108				list_del_init(&micro->msg->node);
109				ipaq_micro_trigger_tx(micro);
110			} else
111				micro->msg = NULL;
112			dev_dbg(micro->dev, "OK RX message 0x%02x\n", id);
113		} else {
114			dev_err(micro->dev,
115				"out of band RX message 0x%02x\n", id);
116			if (!micro->msg)
117				dev_info(micro->dev, "no message queued\n");
118			else
119				dev_info(micro->dev, "expected message %02x\n",
120					 micro->msg->id);
121		}
122		break;
123	case MSG_KEYBOARD:
124		if (micro->key)
125			micro->key(micro->key_data, len, data);
126		else
127			dev_dbg(micro->dev, "key message ignored, no handle\n");
128		break;
129	case MSG_TOUCHSCREEN:
130		if (micro->ts)
131			micro->ts(micro->ts_data, len, data);
132		else
133			dev_dbg(micro->dev, "touchscreen message ignored, no handle\n");
134		break;
135	default:
136		dev_err(micro->dev,
137			"unknown msg %d [%d] ", id, len);
138		for (i = 0; i < len; ++i)
139			pr_cont("0x%02x ", data[i]);
140		pr_cont("\n");
141	}
142	spin_unlock(&micro->lock);
143}
144
145static void micro_process_char(struct ipaq_micro *micro, u8 ch)
146{
147	struct ipaq_micro_rxdev *rx = &micro->rx;
148
149	switch (rx->state) {
150	case STATE_SOF:	/* Looking for SOF */
151		if (ch == CHAR_SOF)
152			rx->state = STATE_ID; /* Next byte is the id and len */
153		break;
154	case STATE_ID: /* Looking for id and len byte */
155		rx->id = (ch & 0xf0) >> 4;
156		rx->len = (ch & 0x0f);
157		rx->index = 0;
158		rx->chksum = ch;
159		rx->state = (rx->len > 0) ? STATE_DATA : STATE_CHKSUM;
160		break;
161	case STATE_DATA: /* Looking for 'len' data bytes */
162		rx->chksum += ch;
163		rx->buf[rx->index] = ch;
164		if (++rx->index == rx->len)
165			rx->state = STATE_CHKSUM;
166		break;
167	case STATE_CHKSUM: /* Looking for the checksum */
168		if (ch == rx->chksum)
169			micro_rx_msg(micro, rx->id, rx->len, rx->buf);
170		rx->state = STATE_SOF;
171		break;
172	}
173}
174
175static void micro_rx_chars(struct ipaq_micro *micro)
176{
177	u32 status, ch;
178
179	while ((status = readl(micro->base + UTSR1)) & UTSR1_RNE) {
180		ch = readl(micro->base + UTDR);
181		if (status & UTSR1_PRE)
182			dev_err(micro->dev, "rx: parity error\n");
183		else if (status & UTSR1_FRE)
184			dev_err(micro->dev, "rx: framing error\n");
185		else if (status & UTSR1_ROR)
186			dev_err(micro->dev, "rx: overrun error\n");
187		micro_process_char(micro, ch);
188	}
189}
190
191static void ipaq_micro_get_version(struct ipaq_micro *micro)
192{
193	struct ipaq_micro_msg msg = {
194		.id = MSG_VERSION,
195	};
196
197	ipaq_micro_tx_msg_sync(micro, &msg);
198	if (msg.rx_len == 4) {
199		memcpy(micro->version, msg.rx_data, 4);
200		micro->version[4] = '\0';
201	} else if (msg.rx_len == 9) {
202		memcpy(micro->version, msg.rx_data, 4);
203		micro->version[4] = '\0';
204		/* Bytes 4-7 are "pack", byte 8 is "boot type" */
205	} else {
206		dev_err(micro->dev,
207			"illegal version message %d bytes\n", msg.rx_len);
208	}
209}
210
211static void ipaq_micro_eeprom_read(struct ipaq_micro *micro,
212				   u8 address, u8 len, u8 *data)
213{
214	struct ipaq_micro_msg msg = {
215		.id = MSG_EEPROM_READ,
216	};
217	u8 i;
218
219	for (i = 0; i < len; i++) {
220		msg.tx_data[0] = address + i;
221		msg.tx_data[1] = 1;
222		msg.tx_len = 2;
223		ipaq_micro_tx_msg_sync(micro, &msg);
224		memcpy(data + (i * 2), msg.rx_data, 2);
225	}
226}
227
228static char *ipaq_micro_str(u8 *wchar, u8 len)
229{
230	char retstr[256];
231	u8 i;
232
233	for (i = 0; i < len / 2; i++)
234		retstr[i] = wchar[i * 2];
235	return kstrdup(retstr, GFP_KERNEL);
236}
237
238static u16 ipaq_micro_to_u16(u8 *data)
239{
240	return data[1] << 8 | data[0];
241}
242
243static void __init ipaq_micro_eeprom_dump(struct ipaq_micro *micro)
244{
245	u8 dump[256];
246	char *str;
247
248	ipaq_micro_eeprom_read(micro, 0, 128, dump);
249	str = ipaq_micro_str(dump, 10);
250	if (str) {
251		dev_info(micro->dev, "HW version %s\n", str);
252		kfree(str);
253	}
254	str = ipaq_micro_str(dump+10, 40);
255	if (str) {
256		dev_info(micro->dev, "serial number: %s\n", str);
257		/* Feed the random pool with this */
258		add_device_randomness(str, strlen(str));
259		kfree(str);
260	}
261	str = ipaq_micro_str(dump+50, 20);
262	if (str) {
263		dev_info(micro->dev, "module ID: %s\n", str);
264		kfree(str);
265	}
266	str = ipaq_micro_str(dump+70, 10);
267	if (str) {
268		dev_info(micro->dev, "product revision: %s\n", str);
269		kfree(str);
270	}
271	dev_info(micro->dev, "product ID: %u\n", ipaq_micro_to_u16(dump+80));
272	dev_info(micro->dev, "frame rate: %u fps\n",
273		 ipaq_micro_to_u16(dump+82));
274	dev_info(micro->dev, "page mode: %u\n", ipaq_micro_to_u16(dump+84));
275	dev_info(micro->dev, "country ID: %u\n", ipaq_micro_to_u16(dump+86));
276	dev_info(micro->dev, "color display: %s\n",
277		 ipaq_micro_to_u16(dump+88) ? "yes" : "no");
278	dev_info(micro->dev, "ROM size: %u MiB\n", ipaq_micro_to_u16(dump+90));
279	dev_info(micro->dev, "RAM size: %u KiB\n", ipaq_micro_to_u16(dump+92));
280	dev_info(micro->dev, "screen: %u x %u\n",
281		 ipaq_micro_to_u16(dump+94), ipaq_micro_to_u16(dump+96));
282}
283
284static void micro_tx_chars(struct ipaq_micro *micro)
285{
286	struct ipaq_micro_txdev *tx = &micro->tx;
287	u32 val;
288
289	while ((tx->index < tx->len) &&
290	       (readl(micro->base + UTSR1) & UTSR1_TNF)) {
291		writel(tx->buf[tx->index], micro->base + UTDR);
292		tx->index++;
293	}
294
295	/* Stop interrupts */
296	val = readl(micro->base + UTCR3);
297	val &= ~UTCR3_TIE;
298	writel(val, micro->base + UTCR3);
299}
300
301static void micro_reset_comm(struct ipaq_micro *micro)
302{
303	struct ipaq_micro_rxdev *rx = &micro->rx;
304	u32 val;
305
306	if (micro->msg)
307		complete(&micro->msg->ack);
308
309	/* Initialize Serial channel protocol frame */
310	rx->state = STATE_SOF;  /* Reset the state machine */
311
312	/* Set up interrupts */
313	writel(0x01, micro->sdlc + 0x0); /* Select UART mode */
314
315	/* Clean up CR3 */
316	writel(0x0, micro->base + UTCR3);
317
318	/* Format: 8N1 */
319	writel(UTCR0_8BitData | UTCR0_1StpBit, micro->base + UTCR0);
320
321	/* Baud rate: 115200 */
322	writel(0x0, micro->base + UTCR1);
323	writel(0x1, micro->base + UTCR2);
324
325	/* Clear SR0 */
326	writel(0xff, micro->base + UTSR0);
327
328	/* Enable RX int, disable TX int */
329	writel(UTCR3_TXE | UTCR3_RXE | UTCR3_RIE, micro->base + UTCR3);
330	val = readl(micro->base + UTCR3);
331	val &= ~UTCR3_TIE;
332	writel(val, micro->base + UTCR3);
333}
334
335static irqreturn_t micro_serial_isr(int irq, void *dev_id)
336{
337	struct ipaq_micro *micro = dev_id;
338	struct ipaq_micro_txdev *tx = &micro->tx;
339	u32 status;
340
341	status = readl(micro->base + UTSR0);
342	do {
343		if (status & (UTSR0_RID | UTSR0_RFS)) {
344			if (status & UTSR0_RID)
345				/* Clear the Receiver IDLE bit */
346				writel(UTSR0_RID, micro->base + UTSR0);
347			micro_rx_chars(micro);
348		}
349
350		/* Clear break bits */
351		if (status & (UTSR0_RBB | UTSR0_REB))
352			writel(status & (UTSR0_RBB | UTSR0_REB),
353			       micro->base + UTSR0);
354
355		if (status & UTSR0_TFS)
356			micro_tx_chars(micro);
357
358		status = readl(micro->base + UTSR0);
359
360	} while (((tx->index < tx->len) && (status & UTSR0_TFS)) ||
361		 (status & (UTSR0_RFS | UTSR0_RID)));
362
363	return IRQ_HANDLED;
364}
365
366static const struct mfd_cell micro_cells[] = {
367	{ .name = "ipaq-micro-backlight", },
368	{ .name = "ipaq-micro-battery", },
369	{ .name = "ipaq-micro-keys", },
370	{ .name = "ipaq-micro-ts", },
371	{ .name = "ipaq-micro-leds", },
372};
373
374static int __maybe_unused micro_resume(struct device *dev)
375{
376	struct ipaq_micro *micro = dev_get_drvdata(dev);
377
378	micro_reset_comm(micro);
379	mdelay(10);
380
381	return 0;
382}
383
384static int __init micro_probe(struct platform_device *pdev)
385{
386	struct ipaq_micro *micro;
387	struct resource *res;
388	int ret;
389	int irq;
390
391	micro = devm_kzalloc(&pdev->dev, sizeof(*micro), GFP_KERNEL);
392	if (!micro)
393		return -ENOMEM;
394
395	micro->dev = &pdev->dev;
396
397	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
398	micro->base = devm_ioremap_resource(&pdev->dev, res);
399	if (IS_ERR(micro->base))
400		return PTR_ERR(micro->base);
401
402	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
403	if (!res)
404		return -EINVAL;
405
406	micro->sdlc = devm_ioremap_resource(&pdev->dev, res);
407	if (IS_ERR(micro->sdlc))
408		return PTR_ERR(micro->sdlc);
409
410	micro_reset_comm(micro);
411
412	irq = platform_get_irq(pdev, 0);
413	if (!irq)
414		return -EINVAL;
415	ret = devm_request_irq(&pdev->dev, irq, micro_serial_isr,
416			       IRQF_SHARED, "ipaq-micro",
417			       micro);
418	if (ret) {
419		dev_err(&pdev->dev, "unable to grab serial port IRQ\n");
420		return ret;
421	} else
422		dev_info(&pdev->dev, "grabbed serial port IRQ\n");
423
424	spin_lock_init(&micro->lock);
425	INIT_LIST_HEAD(&micro->queue);
426	platform_set_drvdata(pdev, micro);
427
428	ret = mfd_add_devices(&pdev->dev, pdev->id, micro_cells,
429			      ARRAY_SIZE(micro_cells), NULL, 0, NULL);
430	if (ret) {
431		dev_err(&pdev->dev, "error adding MFD cells");
432		return ret;
433	}
434
435	/* Check version */
436	ipaq_micro_get_version(micro);
437	dev_info(&pdev->dev, "Atmel micro ASIC version %s\n", micro->version);
438	ipaq_micro_eeprom_dump(micro);
439
440	return 0;
441}
442
443static const struct dev_pm_ops micro_dev_pm_ops = {
444	SET_SYSTEM_SLEEP_PM_OPS(NULL, micro_resume)
445};
446
447static struct platform_driver micro_device_driver = {
448	.driver   = {
449		.name	= "ipaq-h3xxx-micro",
450		.pm	= &micro_dev_pm_ops,
451		.suppress_bind_attrs = true,
452	},
453};
454builtin_platform_driver_probe(micro_device_driver, micro_probe);