2 * Compaq iPAQ h3xxx Atmel microcontroller companion support
4 * This is an Atmel AT90LS8535 with a special flashed-in firmware that
5 * implements the special protocol used by this driver.
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>
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.
17 #include <linux/module.h>
18 #include <linux/init.h>
19 #include <linux/interrupt.h>
21 #include <linux/delay.h>
22 #include <linux/device.h>
23 #include <linux/platform_device.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>
32 #include <mach/hardware.h>
34 static void ipaq_micro_trigger_tx(struct ipaq_micro *micro)
36 struct ipaq_micro_txdev *tx = µ->tx;
37 struct ipaq_micro_msg *msg = micro->msg;
43 tx->buf[bp++] = CHAR_SOF;
45 checksum = ((msg->id & 0x0f) << 4) | (msg->tx_len & 0x0f);
46 tx->buf[bp++] = checksum;
48 for (i = 0; i < msg->tx_len; i++) {
49 tx->buf[bp++] = msg->tx_data[i];
50 checksum += msg->tx_data[i];
53 tx->buf[bp++] = checksum;
56 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_OFFSET, 16, 1,
57 tx->buf, tx->len, true);
59 /* Enable interrupt */
60 val = readl(micro->base + UTCR3);
62 writel(val, micro->base + UTCR3);
65 int ipaq_micro_tx_msg(struct ipaq_micro *micro, struct ipaq_micro_msg *msg)
69 dev_dbg(micro->dev, "TX msg: %02x, %d bytes\n", msg->id, msg->tx_len);
71 spin_lock_irqsave(µ->lock, flags);
73 list_add_tail(&msg->node, µ->queue);
74 spin_unlock_irqrestore(µ->lock, flags);
78 ipaq_micro_trigger_tx(micro);
79 spin_unlock_irqrestore(µ->lock, flags);
82 EXPORT_SYMBOL(ipaq_micro_tx_msg);
84 static void micro_rx_msg(struct ipaq_micro *micro, u8 id, int len, u8 *data)
88 dev_dbg(micro->dev, "RX msg: %02x, %d bytes\n", id, len);
90 spin_lock(µ->lock);
94 case MSG_EEPROM_WRITE:
97 case MSG_THERMAL_SENSOR:
99 /* Handle synchronous messages */
100 if (micro->msg && micro->msg->id == id) {
101 struct ipaq_micro_msg *msg = micro->msg;
103 memcpy(msg->rx_data, data, 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,
110 list_del_init(µ->msg->node);
111 ipaq_micro_trigger_tx(micro);
114 dev_dbg(micro->dev, "OK RX message 0x%02x\n", id);
117 "out of band RX message 0x%02x\n", id);
119 dev_info(micro->dev, "no message queued\n");
121 dev_info(micro->dev, "expected message %02x\n",
127 micro->key(micro->key_data, len, data);
129 dev_dbg(micro->dev, "key message ignored, no handle\n");
131 case MSG_TOUCHSCREEN:
133 micro->ts(micro->ts_data, len, data);
135 dev_dbg(micro->dev, "touchscreen message ignored, no handle\n");
139 "unknown msg %d [%d] ", id, len);
140 for (i = 0; i < len; ++i)
141 pr_cont("0x%02x ", data[i]);
144 spin_unlock(µ->lock);
147 static void micro_process_char(struct ipaq_micro *micro, u8 ch)
149 struct ipaq_micro_rxdev *rx = µ->rx;
152 case STATE_SOF: /* Looking for SOF */
154 rx->state = STATE_ID; /* Next byte is the id and len */
156 case STATE_ID: /* Looking for id and len byte */
157 rx->id = (ch & 0xf0) >> 4;
158 rx->len = (ch & 0x0f);
161 rx->state = (rx->len > 0) ? STATE_DATA : STATE_CHKSUM;
163 case STATE_DATA: /* Looking for 'len' data bytes */
165 rx->buf[rx->index] = ch;
166 if (++rx->index == rx->len)
167 rx->state = STATE_CHKSUM;
169 case STATE_CHKSUM: /* Looking for the checksum */
170 if (ch == rx->chksum)
171 micro_rx_msg(micro, rx->id, rx->len, rx->buf);
172 rx->state = STATE_SOF;
177 static void micro_rx_chars(struct ipaq_micro *micro)
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);
193 static void ipaq_micro_get_version(struct ipaq_micro *micro)
195 struct ipaq_micro_msg msg = {
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 /* Bytes 4-7 are "pack", byte 8 is "boot type" */
209 "illegal version message %d bytes\n", msg.rx_len);
213 static void ipaq_micro_eeprom_read(struct ipaq_micro *micro,
214 u8 address, u8 len, u8 *data)
216 struct ipaq_micro_msg msg = {
217 .id = MSG_EEPROM_READ,
221 for (i = 0; i < len; i++) {
222 msg.tx_data[0] = address + i;
225 ipaq_micro_tx_msg_sync(micro, &msg);
226 memcpy(data + (i * 2), msg.rx_data, 2);
230 static char *ipaq_micro_str(u8 *wchar, u8 len)
235 for (i = 0; i < len / 2; i++)
236 retstr[i] = wchar[i * 2];
237 return kstrdup(retstr, GFP_KERNEL);
240 static u16 ipaq_micro_to_u16(u8 *data)
242 return data[1] << 8 | data[0];
245 static void ipaq_micro_eeprom_dump(struct ipaq_micro *micro)
250 ipaq_micro_eeprom_read(micro, 0, 128, dump);
251 str = ipaq_micro_str(dump, 10);
253 dev_info(micro->dev, "HM version %s\n", str);
256 str = ipaq_micro_str(dump+10, 40);
258 dev_info(micro->dev, "serial number: %s\n", str);
259 /* Feed the random pool with this */
260 add_device_randomness(str, strlen(str));
263 str = ipaq_micro_str(dump+50, 20);
265 dev_info(micro->dev, "module ID: %s\n", str);
268 str = ipaq_micro_str(dump+70, 10);
270 dev_info(micro->dev, "product revision: %s\n", str);
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,
289 static void micro_tx_chars(struct ipaq_micro *micro)
291 struct ipaq_micro_txdev *tx = µ->tx;
294 while ((tx->index < tx->len) &&
295 (readl(micro->base + UTSR1) & UTSR1_TNF)) {
296 writel(tx->buf[tx->index], micro->base + UTDR);
300 /* Stop interrupts */
301 val = readl(micro->base + UTCR3);
303 writel(val, micro->base + UTCR3);
306 static void micro_reset_comm(struct ipaq_micro *micro)
308 struct ipaq_micro_rxdev *rx = µ->rx;
312 complete(µ->msg->ack);
314 /* Initialize Serial channel protocol frame */
315 rx->state = STATE_SOF; /* Reset the state machine */
317 /* Set up interrupts */
318 writel(0x01, micro->sdlc + 0x0); /* Select UART mode */
321 writel(0x0, micro->base + UTCR3);
324 writel(UTCR0_8BitData | UTCR0_1StpBit, micro->base + UTCR0);
326 /* Baud rate: 115200 */
327 writel(0x0, micro->base + UTCR1);
328 writel(0x1, micro->base + UTCR2);
331 writel(0xff, micro->base + UTSR0);
333 /* Enable RX int, disable TX int */
334 writel(UTCR3_TXE | UTCR3_RXE | UTCR3_RIE, micro->base + UTCR3);
335 val = readl(micro->base + UTCR3);
337 writel(val, micro->base + UTCR3);
340 static irqreturn_t micro_serial_isr(int irq, void *dev_id)
342 struct ipaq_micro *micro = dev_id;
343 struct ipaq_micro_txdev *tx = µ->tx;
346 status = readl(micro->base + UTSR0);
348 if (status & (UTSR0_RID | UTSR0_RFS)) {
349 if (status & UTSR0_RID)
350 /* Clear the Receiver IDLE bit */
351 writel(UTSR0_RID, micro->base + UTSR0);
352 micro_rx_chars(micro);
355 /* Clear break bits */
356 if (status & (UTSR0_RBB | UTSR0_REB))
357 writel(status & (UTSR0_RBB | UTSR0_REB),
358 micro->base + UTSR0);
360 if (status & UTSR0_TFS)
361 micro_tx_chars(micro);
363 status = readl(micro->base + UTSR0);
365 } while (((tx->index < tx->len) && (status & UTSR0_TFS)) ||
366 (status & (UTSR0_RFS | UTSR0_RID)));
371 static 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", },
379 static int micro_resume(struct device *dev)
381 struct ipaq_micro *micro = dev_get_drvdata(dev);
383 micro_reset_comm(micro);
389 static int micro_probe(struct platform_device *pdev)
391 struct ipaq_micro *micro;
392 struct resource *res;
396 micro = devm_kzalloc(&pdev->dev, sizeof(*micro), GFP_KERNEL);
400 micro->dev = &pdev->dev;
402 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
406 micro->base = devm_ioremap_resource(&pdev->dev, res);
407 if (IS_ERR(micro->base))
408 return PTR_ERR(micro->base);
410 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
414 micro->sdlc = devm_ioremap_resource(&pdev->dev, res);
415 if (IS_ERR(micro->sdlc))
416 return PTR_ERR(micro->sdlc);
418 micro_reset_comm(micro);
420 irq = platform_get_irq(pdev, 0);
423 ret = devm_request_irq(&pdev->dev, irq, micro_serial_isr,
424 IRQF_SHARED, "ipaq-micro",
427 dev_err(&pdev->dev, "unable to grab serial port IRQ\n");
430 dev_info(&pdev->dev, "grabbed serial port IRQ\n");
432 spin_lock_init(µ->lock);
433 INIT_LIST_HEAD(µ->queue);
434 platform_set_drvdata(pdev, micro);
436 ret = mfd_add_devices(&pdev->dev, pdev->id, micro_cells,
437 ARRAY_SIZE(micro_cells), NULL, 0, NULL);
439 dev_err(&pdev->dev, "error adding MFD cells");
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);
451 static int micro_remove(struct platform_device *pdev)
453 struct ipaq_micro *micro = platform_get_drvdata(pdev);
456 mfd_remove_devices(&pdev->dev);
458 val = readl(micro->base + UTCR3);
459 val &= ~(UTCR3_RXE | UTCR3_RIE); /* disable receive interrupt */
460 val &= ~(UTCR3_TXE | UTCR3_TIE); /* disable transmit interrupt */
461 writel(val, micro->base + UTCR3);
466 static const struct dev_pm_ops micro_dev_pm_ops = {
467 SET_SYSTEM_SLEEP_PM_OPS(NULL, micro_resume)
470 static struct platform_driver micro_device_driver = {
472 .name = "ipaq-h3xxx-micro",
473 .pm = µ_dev_pm_ops,
475 .probe = micro_probe,
476 .remove = micro_remove,
477 /* .shutdown = micro_suspend, // FIXME */
479 module_platform_driver(micro_device_driver);
481 MODULE_LICENSE("GPL");
482 MODULE_DESCRIPTION("driver for iPAQ Atmel micro core and backlight");