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Commit | Line | Data |
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dcc21cc0 LW |
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 | ||
34 | static 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; | |
dcc21cc0 LW |
56 | |
57 | /* Enable interrupt */ | |
58 | val = readl(micro->base + UTCR3); | |
59 | val |= UTCR3_TIE; | |
60 | writel(val, micro->base + UTCR3); | |
61 | } | |
62 | ||
63 | int 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(µ->lock, flags); | |
70 | if (micro->msg) { | |
71 | list_add_tail(&msg->node, µ->queue); | |
72 | spin_unlock_irqrestore(µ->lock, flags); | |
73 | return 0; | |
74 | } | |
75 | micro->msg = msg; | |
76 | ipaq_micro_trigger_tx(micro); | |
77 | spin_unlock_irqrestore(µ->lock, flags); | |
78 | return 0; | |
79 | } | |
80 | EXPORT_SYMBOL(ipaq_micro_tx_msg); | |
81 | ||
82 | static 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(µ->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(µ->msg->ack); | |
104 | if (!list_empty(µ->queue)) { | |
105 | micro->msg = list_entry(micro->queue.next, | |
106 | struct ipaq_micro_msg, | |
107 | node); | |
108 | list_del_init(µ->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); | |
9336fe91 | 116 | if (!micro->msg) |
dcc21cc0 LW |
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 | |
9336fe91 | 127 | dev_dbg(micro->dev, "key message ignored, no handle\n"); |
dcc21cc0 LW |
128 | break; |
129 | case MSG_TOUCHSCREEN: | |
130 | if (micro->ts) | |
131 | micro->ts(micro->ts_data, len, data); | |
132 | else | |
9336fe91 | 133 | dev_dbg(micro->dev, "touchscreen message ignored, no handle\n"); |
dcc21cc0 LW |
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(µ->lock); | |
143 | } | |
144 | ||
145 | static void micro_process_char(struct ipaq_micro *micro, u8 ch) | |
146 | { | |
147 | struct ipaq_micro_rxdev *rx = µ->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 */ | |
9336fe91 | 155 | rx->id = (ch & 0xf0) >> 4; |
dcc21cc0 LW |
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 | ||
175 | static 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 | ||
191 | static 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 | ||
211 | static 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 | ||
228 | static 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 | ||
238 | static u16 ipaq_micro_to_u16(u8 *data) | |
239 | { | |
240 | return data[1] << 8 | data[0]; | |
241 | } | |
242 | ||
035faf4b | 243 | static void __init ipaq_micro_eeprom_dump(struct ipaq_micro *micro) |
dcc21cc0 LW |
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) { | |
7d60bfc9 | 251 | dev_info(micro->dev, "HW version %s\n", str); |
dcc21cc0 LW |
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)); | |
dcc21cc0 LW |
282 | } |
283 | ||
284 | static void micro_tx_chars(struct ipaq_micro *micro) | |
285 | { | |
286 | struct ipaq_micro_txdev *tx = µ->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 | ||
301 | static void micro_reset_comm(struct ipaq_micro *micro) | |
302 | { | |
303 | struct ipaq_micro_rxdev *rx = µ->rx; | |
304 | u32 val; | |
305 | ||
306 | if (micro->msg) | |
307 | complete(µ->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 | ||
335 | static irqreturn_t micro_serial_isr(int irq, void *dev_id) | |
336 | { | |
337 | struct ipaq_micro *micro = dev_id; | |
338 | struct ipaq_micro_txdev *tx = µ->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 | ||
165b1cb1 | 366 | static const struct mfd_cell micro_cells[] = { |
dcc21cc0 LW |
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 | ||
dcdf1173 | 374 | static int __maybe_unused micro_resume(struct device *dev) |
dcc21cc0 LW |
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 | ||
035faf4b | 384 | static int __init micro_probe(struct platform_device *pdev) |
dcc21cc0 LW |
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); | |
63c348cb JH |
398 | micro->base = devm_ioremap_resource(&pdev->dev, res); |
399 | if (IS_ERR(micro->base)) | |
400 | return PTR_ERR(micro->base); | |
dcc21cc0 LW |
401 | |
402 | res = platform_get_resource(pdev, IORESOURCE_MEM, 1); | |
403 | if (!res) | |
404 | return -EINVAL; | |
405 | ||
63c348cb JH |
406 | micro->sdlc = devm_ioremap_resource(&pdev->dev, res); |
407 | if (IS_ERR(micro->sdlc)) | |
408 | return PTR_ERR(micro->sdlc); | |
dcc21cc0 LW |
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(µ->lock); | |
425 | INIT_LIST_HEAD(µ->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 | ||
dcc21cc0 LW |
443 | static const struct dev_pm_ops micro_dev_pm_ops = { |
444 | SET_SYSTEM_SLEEP_PM_OPS(NULL, micro_resume) | |
445 | }; | |
446 | ||
447 | static struct platform_driver micro_device_driver = { | |
448 | .driver = { | |
449 | .name = "ipaq-h3xxx-micro", | |
450 | .pm = µ_dev_pm_ops, | |
035faf4b | 451 | .suppress_bind_attrs = true, |
dcc21cc0 | 452 | }, |
dcc21cc0 | 453 | }; |
035faf4b | 454 | builtin_platform_driver_probe(micro_device_driver, micro_probe); |