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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 = µ->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 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_OFFSET, 16, 1,
57 tx->buf, tx->len, true);
58
59
60 val = readl(micro->base + UTCR3);
61 val |= UTCR3_TIE;
62 writel(val, micro->base + UTCR3);
63}
64
65int ipaq_micro_tx_msg(struct ipaq_micro *micro, struct ipaq_micro_msg *msg)
66{
67 unsigned long flags;
68
69 dev_dbg(micro->dev, "TX msg: %02x, %d bytes\n", msg->id, msg->tx_len);
70
71 spin_lock_irqsave(µ->lock, flags);
72 if (micro->msg) {
73 list_add_tail(&msg->node, µ->queue);
74 spin_unlock_irqrestore(µ->lock, flags);
75 return 0;
76 }
77 micro->msg = msg;
78 ipaq_micro_trigger_tx(micro);
79 spin_unlock_irqrestore(µ->lock, flags);
80 return 0;
81}
82EXPORT_SYMBOL(ipaq_micro_tx_msg);
83
84static void micro_rx_msg(struct ipaq_micro *micro, u8 id, int len, u8 *data)
85{
86 int i;
87
88 dev_dbg(micro->dev, "RX msg: %02x, %d bytes\n", id, len);
89
90 spin_lock(µ->lock);
91 switch (id) {
92 case MSG_VERSION:
93 case MSG_EEPROM_READ:
94 case MSG_EEPROM_WRITE:
95 case MSG_BACKLIGHT:
96 case MSG_NOTIFY_LED:
97 case MSG_THERMAL_SENSOR:
98 case MSG_BATTERY:
99
100 if (micro->msg && micro->msg->id == id) {
101 struct ipaq_micro_msg *msg = micro->msg;
102
103 memcpy(msg->rx_data, data, len);
104 msg->rx_len = len;
105 complete(µ->msg->ack);
106 if (!list_empty(µ->queue)) {
107 micro->msg = list_entry(micro->queue.next,
108 struct ipaq_micro_msg,
109 node);
110 list_del_init(µ->msg->node);
111 ipaq_micro_trigger_tx(micro);
112 } else
113 micro->msg = NULL;
114 dev_dbg(micro->dev, "OK RX message 0x%02x\n", id);
115 } else {
116 dev_err(micro->dev,
117 "out of band RX message 0x%02x\n", id);
118 if (!micro->msg)
119 dev_info(micro->dev, "no message queued\n");
120 else
121 dev_info(micro->dev, "expected message %02x\n",
122 micro->msg->id);
123 }
124 break;
125 case MSG_KEYBOARD:
126 if (micro->key)
127 micro->key(micro->key_data, len, data);
128 else
129 dev_dbg(micro->dev, "key message ignored, no handle\n");
130 break;
131 case MSG_TOUCHSCREEN:
132 if (micro->ts)
133 micro->ts(micro->ts_data, len, data);
134 else
135 dev_dbg(micro->dev, "touchscreen message ignored, no handle\n");
136 break;
137 default:
138 dev_err(micro->dev,
139 "unknown msg %d [%d] ", id, len);
140 for (i = 0; i < len; ++i)
141 pr_cont("0x%02x ", data[i]);
142 pr_cont("\n");
143 }
144 spin_unlock(µ->lock);
145}
146
147static void micro_process_char(struct ipaq_micro *micro, u8 ch)
148{
149 struct ipaq_micro_rxdev *rx = µ->rx;
150
151 switch (rx->state) {
152 case STATE_SOF:
153 if (ch == CHAR_SOF)
154 rx->state = STATE_ID;
155 break;
156 case STATE_ID:
157 rx->id = (ch & 0xf0) >> 4;
158 rx->len = (ch & 0x0f);
159 rx->index = 0;
160 rx->chksum = ch;
161 rx->state = (rx->len > 0) ? STATE_DATA : STATE_CHKSUM;
162 break;
163 case STATE_DATA:
164 rx->chksum += ch;
165 rx->buf[rx->index] = ch;
166 if (++rx->index == rx->len)
167 rx->state = STATE_CHKSUM;
168 break;
169 case STATE_CHKSUM:
170 if (ch == rx->chksum)
171 micro_rx_msg(micro, rx->id, rx->len, rx->buf);
172 rx->state = STATE_SOF;
173 break;
174 }
175}
176
177static void micro_rx_chars(struct ipaq_micro *micro)
178{
179 u32 status, ch;
180
181 while ((status = readl(micro->base + UTSR1)) & UTSR1_RNE) {
182 ch = readl(micro->base + UTDR);
183 if (status & UTSR1_PRE)
184 dev_err(micro->dev, "rx: parity error\n");
185 else if (status & UTSR1_FRE)
186 dev_err(micro->dev, "rx: framing error\n");
187 else if (status & UTSR1_ROR)
188 dev_err(micro->dev, "rx: overrun error\n");
189 micro_process_char(micro, ch);
190 }
191}
192
193static void ipaq_micro_get_version(struct ipaq_micro *micro)
194{
195 struct ipaq_micro_msg msg = {
196 .id = MSG_VERSION,
197 };
198
199 ipaq_micro_tx_msg_sync(micro, &msg);
200 if (msg.rx_len == 4) {
201 memcpy(micro->version, msg.rx_data, 4);
202 micro->version[4] = '\0';
203 } else if (msg.rx_len == 9) {
204 memcpy(micro->version, msg.rx_data, 4);
205 micro->version[4] = '\0';
206
207 } else {
208 dev_err(micro->dev,
209 "illegal version message %d bytes\n", msg.rx_len);
210 }
211}
212
213static void ipaq_micro_eeprom_read(struct ipaq_micro *micro,
214 u8 address, u8 len, u8 *data)
215{
216 struct ipaq_micro_msg msg = {
217 .id = MSG_EEPROM_READ,
218 };
219 u8 i;
220
221 for (i = 0; i < len; i++) {
222 msg.tx_data[0] = address + i;
223 msg.tx_data[1] = 1;
224 msg.tx_len = 2;
225 ipaq_micro_tx_msg_sync(micro, &msg);
226 memcpy(data + (i * 2), msg.rx_data, 2);
227 }
228}
229
230static char *ipaq_micro_str(u8 *wchar, u8 len)
231{
232 char retstr[256];
233 u8 i;
234
235 for (i = 0; i < len / 2; i++)
236 retstr[i] = wchar[i * 2];
237 return kstrdup(retstr, GFP_KERNEL);
238}
239
240static u16 ipaq_micro_to_u16(u8 *data)
241{
242 return data[1] << 8 | data[0];
243}
244
245static void ipaq_micro_eeprom_dump(struct ipaq_micro *micro)
246{
247 u8 dump[256];
248 char *str;
249
250 ipaq_micro_eeprom_read(micro, 0, 128, dump);
251 str = ipaq_micro_str(dump, 10);
252 if (str) {
253 dev_info(micro->dev, "HM version %s\n", str);
254 kfree(str);
255 }
256 str = ipaq_micro_str(dump+10, 40);
257 if (str) {
258 dev_info(micro->dev, "serial number: %s\n", str);
259
260 add_device_randomness(str, strlen(str));
261 kfree(str);
262 }
263 str = ipaq_micro_str(dump+50, 20);
264 if (str) {
265 dev_info(micro->dev, "module ID: %s\n", str);
266 kfree(str);
267 }
268 str = ipaq_micro_str(dump+70, 10);
269 if (str) {
270 dev_info(micro->dev, "product revision: %s\n", str);
271 kfree(str);
272 }
273 dev_info(micro->dev, "product ID: %u\n", ipaq_micro_to_u16(dump+80));
274 dev_info(micro->dev, "frame rate: %u fps\n",
275 ipaq_micro_to_u16(dump+82));
276 dev_info(micro->dev, "page mode: %u\n", ipaq_micro_to_u16(dump+84));
277 dev_info(micro->dev, "country ID: %u\n", ipaq_micro_to_u16(dump+86));
278 dev_info(micro->dev, "color display: %s\n",
279 ipaq_micro_to_u16(dump+88) ? "yes" : "no");
280 dev_info(micro->dev, "ROM size: %u MiB\n", ipaq_micro_to_u16(dump+90));
281 dev_info(micro->dev, "RAM size: %u KiB\n", ipaq_micro_to_u16(dump+92));
282 dev_info(micro->dev, "screen: %u x %u\n",
283 ipaq_micro_to_u16(dump+94), ipaq_micro_to_u16(dump+96));
284 print_hex_dump(KERN_DEBUG, "eeprom: ", DUMP_PREFIX_OFFSET, 16, 1,
285 dump, 256, true);
286
287}
288
289static void micro_tx_chars(struct ipaq_micro *micro)
290{
291 struct ipaq_micro_txdev *tx = µ->tx;
292 u32 val;
293
294 while ((tx->index < tx->len) &&
295 (readl(micro->base + UTSR1) & UTSR1_TNF)) {
296 writel(tx->buf[tx->index], micro->base + UTDR);
297 tx->index++;
298 }
299
300
301 val = readl(micro->base + UTCR3);
302 val &= ~UTCR3_TIE;
303 writel(val, micro->base + UTCR3);
304}
305
306static void micro_reset_comm(struct ipaq_micro *micro)
307{
308 struct ipaq_micro_rxdev *rx = µ->rx;
309 u32 val;
310
311 if (micro->msg)
312 complete(µ->msg->ack);
313
314
315 rx->state = STATE_SOF;
316
317
318 writel(0x01, micro->sdlc + 0x0);
319
320
321 writel(0x0, micro->base + UTCR3);
322
323
324 writel(UTCR0_8BitData | UTCR0_1StpBit, micro->base + UTCR0);
325
326
327 writel(0x0, micro->base + UTCR1);
328 writel(0x1, micro->base + UTCR2);
329
330
331 writel(0xff, micro->base + UTSR0);
332
333
334 writel(UTCR3_TXE | UTCR3_RXE | UTCR3_RIE, micro->base + UTCR3);
335 val = readl(micro->base + UTCR3);
336 val &= ~UTCR3_TIE;
337 writel(val, micro->base + UTCR3);
338}
339
340static irqreturn_t micro_serial_isr(int irq, void *dev_id)
341{
342 struct ipaq_micro *micro = dev_id;
343 struct ipaq_micro_txdev *tx = µ->tx;
344 u32 status;
345
346 status = readl(micro->base + UTSR0);
347 do {
348 if (status & (UTSR0_RID | UTSR0_RFS)) {
349 if (status & UTSR0_RID)
350
351 writel(UTSR0_RID, micro->base + UTSR0);
352 micro_rx_chars(micro);
353 }
354
355
356 if (status & (UTSR0_RBB | UTSR0_REB))
357 writel(status & (UTSR0_RBB | UTSR0_REB),
358 micro->base + UTSR0);
359
360 if (status & UTSR0_TFS)
361 micro_tx_chars(micro);
362
363 status = readl(micro->base + UTSR0);
364
365 } while (((tx->index < tx->len) && (status & UTSR0_TFS)) ||
366 (status & (UTSR0_RFS | UTSR0_RID)));
367
368 return IRQ_HANDLED;
369}
370
371static const struct mfd_cell micro_cells[] = {
372 { .name = "ipaq-micro-backlight", },
373 { .name = "ipaq-micro-battery", },
374 { .name = "ipaq-micro-keys", },
375 { .name = "ipaq-micro-ts", },
376 { .name = "ipaq-micro-leds", },
377};
378
379static int micro_resume(struct device *dev)
380{
381 struct ipaq_micro *micro = dev_get_drvdata(dev);
382
383 micro_reset_comm(micro);
384 mdelay(10);
385
386 return 0;
387}
388
389static int micro_probe(struct platform_device *pdev)
390{
391 struct ipaq_micro *micro;
392 struct resource *res;
393 int ret;
394 int irq;
395
396 micro = devm_kzalloc(&pdev->dev, sizeof(*micro), GFP_KERNEL);
397 if (!micro)
398 return -ENOMEM;
399
400 micro->dev = &pdev->dev;
401
402 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
403 if (!res)
404 return -EINVAL;
405
406 micro->base = devm_ioremap_resource(&pdev->dev, res);
407 if (IS_ERR(micro->base))
408 return PTR_ERR(micro->base);
409
410 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
411 if (!res)
412 return -EINVAL;
413
414 micro->sdlc = devm_ioremap_resource(&pdev->dev, res);
415 if (IS_ERR(micro->sdlc))
416 return PTR_ERR(micro->sdlc);
417
418 micro_reset_comm(micro);
419
420 irq = platform_get_irq(pdev, 0);
421 if (!irq)
422 return -EINVAL;
423 ret = devm_request_irq(&pdev->dev, irq, micro_serial_isr,
424 IRQF_SHARED, "ipaq-micro",
425 micro);
426 if (ret) {
427 dev_err(&pdev->dev, "unable to grab serial port IRQ\n");
428 return ret;
429 } else
430 dev_info(&pdev->dev, "grabbed serial port IRQ\n");
431
432 spin_lock_init(µ->lock);
433 INIT_LIST_HEAD(µ->queue);
434 platform_set_drvdata(pdev, micro);
435
436 ret = mfd_add_devices(&pdev->dev, pdev->id, micro_cells,
437 ARRAY_SIZE(micro_cells), NULL, 0, NULL);
438 if (ret) {
439 dev_err(&pdev->dev, "error adding MFD cells");
440 return ret;
441 }
442
443
444 ipaq_micro_get_version(micro);
445 dev_info(&pdev->dev, "Atmel micro ASIC version %s\n", micro->version);
446 ipaq_micro_eeprom_dump(micro);
447
448 return 0;
449}
450
451static int micro_remove(struct platform_device *pdev)
452{
453 struct ipaq_micro *micro = platform_get_drvdata(pdev);
454 u32 val;
455
456 mfd_remove_devices(&pdev->dev);
457
458 val = readl(micro->base + UTCR3);
459 val &= ~(UTCR3_RXE | UTCR3_RIE);
460 val &= ~(UTCR3_TXE | UTCR3_TIE);
461 writel(val, micro->base + UTCR3);
462
463 return 0;
464}
465
466static const struct dev_pm_ops micro_dev_pm_ops = {
467 SET_SYSTEM_SLEEP_PM_OPS(NULL, micro_resume)
468};
469
470static struct platform_driver micro_device_driver = {
471 .driver = {
472 .name = "ipaq-h3xxx-micro",
473 .pm = µ_dev_pm_ops,
474 },
475 .probe = micro_probe,
476 .remove = micro_remove,
477
478};
479module_platform_driver(micro_device_driver);
480
481MODULE_LICENSE("GPL");
482MODULE_DESCRIPTION("driver for iPAQ Atmel micro core and backlight");
483
