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[SPARC64]: Convert sparc64 PCI layer to in-kernel device tree.
[mirror_ubuntu-hirsute-kernel.git] / drivers / sbus / char / envctrl.c
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1da177e4
LT		 1/* $Id: envctrl.c,v 1.25 2002/01/15 09:01:26 davem Exp $
2 * envctrl.c: Temperature and Fan monitoring on Machines providing it.
3 *
4 * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
5 * Copyright (C) 2000 Vinh Truong (vinh.truong@eng.sun.com)
6 * VT - The implementation is to support Sun Microelectronics (SME) platform
7 * environment monitoring. SME platforms use pcf8584 as the i2c bus
8 * controller to access pcf8591 (8-bit A/D and D/A converter) and
9 * pcf8571 (256 x 8-bit static low-voltage RAM with I2C-bus interface).
10 * At board level, it follows SME Firmware I2C Specification. Reference:
11 * http://www-eu2.semiconductors.com/pip/PCF8584P
12 * http://www-eu2.semiconductors.com/pip/PCF8574AP
13 * http://www-eu2.semiconductors.com/pip/PCF8591P
14 *
15 * EB - Added support for CP1500 Global Address and PS/Voltage monitoring.
16 * Eric Brower <ebrower@usa.net>
17 *
18 * DB - Audit every copy_to_user in envctrl_read.
19 * Daniele Bellucci <bellucda@tiscali.it>
20 */
21
4b502421 22#define __KERNEL_SYSCALLS__
0aaaa028 23static int errno;
4b502421 24
1da177e4
LT		 25#include <linux/config.h>
26#include <linux/module.h>
27#include <linux/sched.h>
218b29e0 28#include <linux/kthread.h>
1da177e4
LT		 29#include <linux/errno.h>
30#include <linux/delay.h>
31#include <linux/ioport.h>
32#include <linux/init.h>
33#include <linux/miscdevice.h>
34#include <linux/mm.h>
35#include <linux/slab.h>
36#include <linux/kernel.h>
37
38#include <asm/ebus.h>
39#include <asm/uaccess.h>
40#include <asm/envctrl.h>
41
1da177e4
LT		 42#define ENVCTRL_MINOR 162
43
44#define PCF8584_ADDRESS 0x55
45
46#define CONTROL_PIN 0x80
47#define CONTROL_ES0 0x40
48#define CONTROL_ES1 0x20
49#define CONTROL_ES2 0x10
50#define CONTROL_ENI 0x08
51#define CONTROL_STA 0x04
52#define CONTROL_STO 0x02
53#define CONTROL_ACK 0x01
54
55#define STATUS_PIN 0x80
56#define STATUS_STS 0x20
57#define STATUS_BER 0x10
58#define STATUS_LRB 0x08
59#define STATUS_AD0 0x08
60#define STATUS_AAB 0x04
61#define STATUS_LAB 0x02
62#define STATUS_BB 0x01
63
64/*
65 * CLK Mode Register.
66 */
67#define BUS_CLK_90 0x00
68#define BUS_CLK_45 0x01
69#define BUS_CLK_11 0x02
70#define BUS_CLK_1_5 0x03
71
72#define CLK_3 0x00
73#define CLK_4_43 0x10
74#define CLK_6 0x14
75#define CLK_8 0x18
76#define CLK_12 0x1c
77
78#define OBD_SEND_START 0xc5 /* value to generate I2c_bus START condition */
79#define OBD_SEND_STOP 0xc3 /* value to generate I2c_bus STOP condition */
80
81/* Monitor type of i2c child device.
82 * Firmware definitions.
83 */
84#define PCF8584_MAX_CHANNELS 8
85#define PCF8584_GLOBALADDR_TYPE 6 /* global address monitor */
86#define PCF8584_FANSTAT_TYPE 3 /* fan status monitor */
87#define PCF8584_VOLTAGE_TYPE 2 /* voltage monitor */
88#define PCF8584_TEMP_TYPE 1 /* temperature monitor*/
89
90/* Monitor type of i2c child device.
91 * Driver definitions.
92 */
93#define ENVCTRL_NOMON 0
94#define ENVCTRL_CPUTEMP_MON 1 /* cpu temperature monitor */
95#define ENVCTRL_CPUVOLTAGE_MON 2 /* voltage monitor */
96#define ENVCTRL_FANSTAT_MON 3 /* fan status monitor */
97#define ENVCTRL_ETHERTEMP_MON 4 /* ethernet temperarture */
98 /* monitor */
99#define ENVCTRL_VOLTAGESTAT_MON 5 /* voltage status monitor */
100#define ENVCTRL_MTHRBDTEMP_MON 6 /* motherboard temperature */
101#define ENVCTRL_SCSITEMP_MON 7 /* scsi temperarture */
102#define ENVCTRL_GLOBALADDR_MON 8 /* global address */
103
104/* Child device type.
105 * Driver definitions.
106 */
107#define I2C_ADC 0 /* pcf8591 */
108#define I2C_GPIO 1 /* pcf8571 */
109
110/* Data read from child device may need to decode
111 * through a data table and a scale.
112 * Translation type as defined by firmware.
113 */
114#define ENVCTRL_TRANSLATE_NO 0
115#define ENVCTRL_TRANSLATE_PARTIAL 1
116#define ENVCTRL_TRANSLATE_COMBINED 2
117#define ENVCTRL_TRANSLATE_FULL 3 /* table[data] */
118#define ENVCTRL_TRANSLATE_SCALE 4 /* table[data]/scale */
119
120/* Driver miscellaneous definitions. */
121#define ENVCTRL_MAX_CPU 4
122#define CHANNEL_DESC_SZ 256
123
124/* Mask values for combined GlobalAddress/PowerStatus node */
125#define ENVCTRL_GLOBALADDR_ADDR_MASK 0x1F
126#define ENVCTRL_GLOBALADDR_PSTAT_MASK 0x60
127
128/* Node 0x70 ignored on CompactPCI CP1400/1500 platforms
129 * (see envctrl_init_i2c_child)
130 */
131#define ENVCTRL_CPCI_IGNORED_NODE 0x70
132
133#define PCF8584_DATA 0x00
134#define PCF8584_CSR 0x01
135
136/* Each child device can be monitored by up to PCF8584_MAX_CHANNELS.
137 * Property of a port or channel as defined by the firmware.
138 */
139struct pcf8584_channel {
140 unsigned char chnl_no;
141 unsigned char io_direction;
142 unsigned char type;
143 unsigned char last;
144};
145
146/* Each child device may have one or more tables of bytes to help decode
147 * data. Table property as defined by the firmware.
148 */
149struct pcf8584_tblprop {
150 unsigned int type;
151 unsigned int scale;
152 unsigned int offset; /* offset from the beginning of the table */
153 unsigned int size;
154};
155
156/* i2c child */
157struct i2c_child_t {
158 /* Either ADC or GPIO. */
159 unsigned char i2ctype;
160 unsigned long addr;
161 struct pcf8584_channel chnl_array[PCF8584_MAX_CHANNELS];
162
163 /* Channel info. */
164 unsigned int total_chnls; /* Number of monitor channels. */
165 unsigned char fan_mask; /* Byte mask for fan status channels. */
166 unsigned char voltage_mask; /* Byte mask for voltage status channels. */
167 struct pcf8584_tblprop tblprop_array[PCF8584_MAX_CHANNELS];
168
169 /* Properties of all monitor channels. */
170 unsigned int total_tbls; /* Number of monitor tables. */
171 char *tables; /* Pointer to table(s). */
172 char chnls_desc[CHANNEL_DESC_SZ]; /* Channel description. */
173 char mon_type[PCF8584_MAX_CHANNELS];
174};
175
176static void __iomem *i2c;
177static struct i2c_child_t i2c_childlist[ENVCTRL_MAX_CPU*2];
178static unsigned char chnls_mask[] = { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80 };
179static unsigned int warning_temperature = 0;
180static unsigned int shutdown_temperature = 0;
181static char read_cpu;
182
183/* Forward declarations. */
184static struct i2c_child_t *envctrl_get_i2c_child(unsigned char);
185
186/* Function Description: Test the PIN bit (Pending Interrupt Not)
187 * to test when serial transmission is completed .
188 * Return : None.
189 */
190static void envtrl_i2c_test_pin(void)
191{
192 int limit = 1000000;
193
194 while (--limit > 0) {
195 if (!(readb(i2c + PCF8584_CSR) & STATUS_PIN))
196 break;
197 udelay(1);
198 }
199
200 if (limit <= 0)
201 printk(KERN_INFO "envctrl: Pin status will not clear.\n");
202}
203
204/* Function Description: Test busy bit.
205 * Return : None.
206 */
207static void envctrl_i2c_test_bb(void)
208{
209 int limit = 1000000;
210
211 while (--limit > 0) {
212 /* Busy bit 0 means busy. */
213 if (readb(i2c + PCF8584_CSR) & STATUS_BB)
214 break;
215 udelay(1);
216 }
217
218 if (limit <= 0)
219 printk(KERN_INFO "envctrl: Busy bit will not clear.\n");
220}
221
222/* Function Description: Send the address for a read access.
223 * Return : 0 if not acknowledged, otherwise acknowledged.
224 */
225static int envctrl_i2c_read_addr(unsigned char addr)
226{
227 envctrl_i2c_test_bb();
228
229 /* Load address. */
230 writeb(addr + 1, i2c + PCF8584_DATA);
231
232 envctrl_i2c_test_bb();
233
234 writeb(OBD_SEND_START, i2c + PCF8584_CSR);
235
236 /* Wait for PIN. */
237 envtrl_i2c_test_pin();
238
239 /* CSR 0 means acknowledged. */
240 if (!(readb(i2c + PCF8584_CSR) & STATUS_LRB)) {
241 return readb(i2c + PCF8584_DATA);
242 } else {
243 writeb(OBD_SEND_STOP, i2c + PCF8584_CSR);
244 return 0;
245 }
246}
247
248/* Function Description: Send the address for write mode.
249 * Return : None.
250 */
251static void envctrl_i2c_write_addr(unsigned char addr)
252{
253 envctrl_i2c_test_bb();
254 writeb(addr, i2c + PCF8584_DATA);
255
256 /* Generate Start condition. */
257 writeb(OBD_SEND_START, i2c + PCF8584_CSR);
258}
259
260/* Function Description: Read 1 byte of data from addr
261 * set by envctrl_i2c_read_addr()
262 * Return : Data from address set by envctrl_i2c_read_addr().
263 */
264static unsigned char envctrl_i2c_read_data(void)
265{
266 envtrl_i2c_test_pin();
267 writeb(CONTROL_ES0, i2c + PCF8584_CSR); /* Send neg ack. */
268 return readb(i2c + PCF8584_DATA);
269}
270
271/* Function Description: Instruct the device which port to read data from.
272 * Return : None.
273 */
274static void envctrl_i2c_write_data(unsigned char port)
275{
276 envtrl_i2c_test_pin();
277 writeb(port, i2c + PCF8584_DATA);
278}
279
280/* Function Description: Generate Stop condition after last byte is sent.
281 * Return : None.
282 */
283static void envctrl_i2c_stop(void)
284{
285 envtrl_i2c_test_pin();
286 writeb(OBD_SEND_STOP, i2c + PCF8584_CSR);
287}
288
289/* Function Description: Read adc device.
290 * Return : Data at address and port.
291 */
292static unsigned char envctrl_i2c_read_8591(unsigned char addr, unsigned char port)
293{
294 /* Send address. */
295 envctrl_i2c_write_addr(addr);
296
297 /* Setup port to read. */
298 envctrl_i2c_write_data(port);
299 envctrl_i2c_stop();
300
301 /* Read port. */
302 envctrl_i2c_read_addr(addr);
303
304 /* Do a single byte read and send stop. */
305 envctrl_i2c_read_data();
306 envctrl_i2c_stop();
307
308 return readb(i2c + PCF8584_DATA);
309}
310
311/* Function Description: Read gpio device.
312 * Return : Data at address.
313 */
314static unsigned char envctrl_i2c_read_8574(unsigned char addr)
315{
316 unsigned char rd;
317
318 envctrl_i2c_read_addr(addr);
319
320 /* Do a single byte read and send stop. */
321 rd = envctrl_i2c_read_data();
322 envctrl_i2c_stop();
323 return rd;
324}
325
326/* Function Description: Decode data read from an adc device using firmware
327 * table.
328 * Return: Number of read bytes. Data is stored in bufdata in ascii format.
329 */
330static int envctrl_i2c_data_translate(unsigned char data, int translate_type,
331 int scale, char *tbl, char *bufdata)
332{
333 int len = 0;
334
335 switch (translate_type) {
336 case ENVCTRL_TRANSLATE_NO:
337 /* No decode necessary. */
338 len = 1;
339 bufdata[0] = data;
340 break;
341
342 case ENVCTRL_TRANSLATE_FULL:
343 /* Decode this way: data = table[data]. */
344 len = 1;
345 bufdata[0] = tbl[data];
346 break;
347
348 case ENVCTRL_TRANSLATE_SCALE:
349 /* Decode this way: data = table[data]/scale */
350 sprintf(bufdata,"%d ", (tbl[data] * 10) / (scale));
351 len = strlen(bufdata);
352 bufdata[len - 1] = bufdata[len - 2];
353 bufdata[len - 2] = '.';
354 break;
355
356 default:
357 break;
358 };
359
360 return len;
361}
362
363/* Function Description: Read cpu-related data such as cpu temperature, voltage.
364 * Return: Number of read bytes. Data is stored in bufdata in ascii format.
365 */
366static int envctrl_read_cpu_info(int cpu, struct i2c_child_t *pchild,
367 char mon_type, unsigned char *bufdata)
368{
369 unsigned char data;
370 int i;
371 char *tbl, j = -1;
372
373 /* Find the right monitor type and channel. */
374 for (i = 0; i < PCF8584_MAX_CHANNELS; i++) {
375 if (pchild->mon_type[i] == mon_type) {
376 if (++j == cpu) {
377 break;
378 }
379 }
380 }
381
382 if (j != cpu)
383 return 0;
384
385 /* Read data from address and port. */
386 data = envctrl_i2c_read_8591((unsigned char)pchild->addr,
387 (unsigned char)pchild->chnl_array[i].chnl_no);
388
389 /* Find decoding table. */
390 tbl = pchild->tables + pchild->tblprop_array[i].offset;
391
392 return envctrl_i2c_data_translate(data, pchild->tblprop_array[i].type,
393 pchild->tblprop_array[i].scale,
394 tbl, bufdata);
395}
396
397/* Function Description: Read noncpu-related data such as motherboard
398 * temperature.
399 * Return: Number of read bytes. Data is stored in bufdata in ascii format.
400 */
401static int envctrl_read_noncpu_info(struct i2c_child_t *pchild,
402 char mon_type, unsigned char *bufdata)
403{
404 unsigned char data;
405 int i;
406 char *tbl = NULL;
407
408 for (i = 0; i < PCF8584_MAX_CHANNELS; i++) {
409 if (pchild->mon_type[i] == mon_type)
410 break;
411 }
412
413 if (i >= PCF8584_MAX_CHANNELS)
414 return 0;
415
416 /* Read data from address and port. */
417 data = envctrl_i2c_read_8591((unsigned char)pchild->addr,
418 (unsigned char)pchild->chnl_array[i].chnl_no);
419
420 /* Find decoding table. */
421 tbl = pchild->tables + pchild->tblprop_array[i].offset;
422
423 return envctrl_i2c_data_translate(data, pchild->tblprop_array[i].type,
424 pchild->tblprop_array[i].scale,
425 tbl, bufdata);
426}
427
428/* Function Description: Read fan status.
429 * Return : Always 1 byte. Status stored in bufdata.
430 */
431static int envctrl_i2c_fan_status(struct i2c_child_t *pchild,
432 unsigned char data,
433 char *bufdata)
434{
435 unsigned char tmp, ret = 0;
436 int i, j = 0;
437
438 tmp = data & pchild->fan_mask;
439
440 if (tmp == pchild->fan_mask) {
441 /* All bits are on. All fans are functioning. */
442 ret = ENVCTRL_ALL_FANS_GOOD;
443 } else if (tmp == 0) {
444 /* No bits are on. No fans are functioning. */
445 ret = ENVCTRL_ALL_FANS_BAD;
446 } else {
447 /* Go through all channels, mark 'on' the matched bits.
448 * Notice that fan_mask may have discontiguous bits but
449 * return mask are always contiguous. For example if we
450 * monitor 4 fans at channels 0,1,2,4, the return mask
451 * should be 00010000 if only fan at channel 4 is working.
452 */
453 for (i = 0; i < PCF8584_MAX_CHANNELS;i++) {
454 if (pchild->fan_mask & chnls_mask[i]) {
455 if (!(chnls_mask[i] & tmp))
456 ret |= chnls_mask[j];
457
458 j++;
459 }
460 }
461 }
462
463 bufdata[0] = ret;
464 return 1;
465}
466
467/* Function Description: Read global addressing line.
468 * Return : Always 1 byte. Status stored in bufdata.
469 */
470static int envctrl_i2c_globaladdr(struct i2c_child_t *pchild,
471 unsigned char data,
472 char *bufdata)
473{
474 /* Translatation table is not necessary, as global
475 * addr is the integer value of the GA# bits.
476 *
477 * NOTE: MSB is documented as zero, but I see it as '1' always....
478 *
479 * -----------------------------------------------
480 * | 0 | FAL | DEG | GA4 | GA3 | GA2 | GA1 | GA0 |
481 * -----------------------------------------------
482 * GA0 - GA4 integer value of Global Address (backplane slot#)
483 * DEG 0 = cPCI Power supply output is starting to degrade
484 * 1 = cPCI Power supply output is OK
485 * FAL 0 = cPCI Power supply has failed
486 * 1 = cPCI Power supply output is OK
487 */
488 bufdata[0] = (data & ENVCTRL_GLOBALADDR_ADDR_MASK);
489 return 1;
490}
491
492/* Function Description: Read standard voltage and power supply status.
493 * Return : Always 1 byte. Status stored in bufdata.
494 */
495static unsigned char envctrl_i2c_voltage_status(struct i2c_child_t *pchild,
496 unsigned char data,
497 char *bufdata)
498{
499 unsigned char tmp, ret = 0;
500 int i, j = 0;
501
502 tmp = data & pchild->voltage_mask;
503
504 /* Two channels are used to monitor voltage and power supply. */
505 if (tmp == pchild->voltage_mask) {
506 /* All bits are on. Voltage and power supply are okay. */
507 ret = ENVCTRL_VOLTAGE_POWERSUPPLY_GOOD;
508 } else if (tmp == 0) {
509 /* All bits are off. Voltage and power supply are bad */
510 ret = ENVCTRL_VOLTAGE_POWERSUPPLY_BAD;
511 } else {
512 /* Either voltage or power supply has problem. */
513 for (i = 0; i < PCF8584_MAX_CHANNELS; i++) {
514 if (pchild->voltage_mask & chnls_mask[i]) {
515 j++;
516
517 /* Break out when there is a mismatch. */
518 if (!(chnls_mask[i] & tmp))
519 break;
520 }
521 }
522
523 /* Make a wish that hardware will always use the
524 * first channel for voltage and the second for
525 * power supply.
526 */
527 if (j == 1)
528 ret = ENVCTRL_VOLTAGE_BAD;
529 else
530 ret = ENVCTRL_POWERSUPPLY_BAD;
531 }
532
533 bufdata[0] = ret;
534 return 1;
535}
536
537/* Function Description: Read a byte from /dev/envctrl. Mapped to user read().
538 * Return: Number of read bytes. 0 for error.
539 */
540static ssize_t
541envctrl_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
542{
543 struct i2c_child_t *pchild;
544 unsigned char data[10];
545 int ret = 0;
546
547 /* Get the type of read as decided in ioctl() call.
548 * Find the appropriate i2c child.
549 * Get the data and put back to the user buffer.
550 */
551
552 switch ((int)(long)file->private_data) {
553 case ENVCTRL_RD_WARNING_TEMPERATURE:
554 if (warning_temperature == 0)
555 return 0;
556
557 data[0] = (unsigned char)(warning_temperature);
558 ret = 1;
559 if (copy_to_user(buf, data, ret))
560 ret = -EFAULT;
561 break;
562
563 case ENVCTRL_RD_SHUTDOWN_TEMPERATURE:
564 if (shutdown_temperature == 0)
565 return 0;
566
567 data[0] = (unsigned char)(shutdown_temperature);
568 ret = 1;
569 if (copy_to_user(buf, data, ret))
570 ret = -EFAULT;
571 break;
572
573 case ENVCTRL_RD_MTHRBD_TEMPERATURE:
574 if (!(pchild = envctrl_get_i2c_child(ENVCTRL_MTHRBDTEMP_MON)))
575 return 0;
576 ret = envctrl_read_noncpu_info(pchild, ENVCTRL_MTHRBDTEMP_MON, data);
577 if (copy_to_user(buf, data, ret))
578 ret = -EFAULT;
579 break;
580
581 case ENVCTRL_RD_CPU_TEMPERATURE:
582 if (!(pchild = envctrl_get_i2c_child(ENVCTRL_CPUTEMP_MON)))
583 return 0;
584 ret = envctrl_read_cpu_info(read_cpu, pchild, ENVCTRL_CPUTEMP_MON, data);
585
586 /* Reset cpu to the default cpu0. */
587 if (copy_to_user(buf, data, ret))
588 ret = -EFAULT;
589 break;
590
591 case ENVCTRL_RD_CPU_VOLTAGE:
592 if (!(pchild = envctrl_get_i2c_child(ENVCTRL_CPUVOLTAGE_MON)))
593 return 0;
594 ret = envctrl_read_cpu_info(read_cpu, pchild, ENVCTRL_CPUVOLTAGE_MON, data);
595
596 /* Reset cpu to the default cpu0. */
597 if (copy_to_user(buf, data, ret))
598 ret = -EFAULT;
599 break;
600
601 case ENVCTRL_RD_SCSI_TEMPERATURE:
602 if (!(pchild = envctrl_get_i2c_child(ENVCTRL_SCSITEMP_MON)))
603 return 0;
604 ret = envctrl_read_noncpu_info(pchild, ENVCTRL_SCSITEMP_MON, data);
605 if (copy_to_user(buf, data, ret))
606 ret = -EFAULT;
607 break;
608
609 case ENVCTRL_RD_ETHERNET_TEMPERATURE:
610 if (!(pchild = envctrl_get_i2c_child(ENVCTRL_ETHERTEMP_MON)))
611 return 0;
612 ret = envctrl_read_noncpu_info(pchild, ENVCTRL_ETHERTEMP_MON, data);
613 if (copy_to_user(buf, data, ret))
614 ret = -EFAULT;
615 break;
616
617 case ENVCTRL_RD_FAN_STATUS:
618 if (!(pchild = envctrl_get_i2c_child(ENVCTRL_FANSTAT_MON)))
619 return 0;
620 data[0] = envctrl_i2c_read_8574(pchild->addr);
621 ret = envctrl_i2c_fan_status(pchild,data[0], data);
622 if (copy_to_user(buf, data, ret))
623 ret = -EFAULT;
624 break;
625
626 case ENVCTRL_RD_GLOBALADDRESS:
627 if (!(pchild = envctrl_get_i2c_child(ENVCTRL_GLOBALADDR_MON)))
628 return 0;
629 data[0] = envctrl_i2c_read_8574(pchild->addr);
630 ret = envctrl_i2c_globaladdr(pchild, data[0], data);
631 if (copy_to_user(buf, data, ret))
632 ret = -EFAULT;
633 break;
634
635 case ENVCTRL_RD_VOLTAGE_STATUS:
636 if (!(pchild = envctrl_get_i2c_child(ENVCTRL_VOLTAGESTAT_MON)))
637 /* If voltage monitor not present, check for CPCI equivalent */
638 if (!(pchild = envctrl_get_i2c_child(ENVCTRL_GLOBALADDR_MON)))
639 return 0;
640 data[0] = envctrl_i2c_read_8574(pchild->addr);
641 ret = envctrl_i2c_voltage_status(pchild, data[0], data);
642 if (copy_to_user(buf, data, ret))
643 ret = -EFAULT;
644 break;
645
646 default:
647 break;
648
649 };
650
651 return ret;
652}
653
654/* Function Description: Command what to read. Mapped to user ioctl().
655 * Return: Gives 0 for implemented commands, -EINVAL otherwise.
656 */
1928f8e5
CH		 657static long
658envctrl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1da177e4
LT		 659{
660 char __user *infobuf;
661
662 switch (cmd) {
663 case ENVCTRL_RD_WARNING_TEMPERATURE:
664 case ENVCTRL_RD_SHUTDOWN_TEMPERATURE:
665 case ENVCTRL_RD_MTHRBD_TEMPERATURE:
666 case ENVCTRL_RD_FAN_STATUS:
667 case ENVCTRL_RD_VOLTAGE_STATUS:
668 case ENVCTRL_RD_ETHERNET_TEMPERATURE:
669 case ENVCTRL_RD_SCSI_TEMPERATURE:
670 case ENVCTRL_RD_GLOBALADDRESS:
671 file->private_data = (void *)(long)cmd;
672 break;
673
674 case ENVCTRL_RD_CPU_TEMPERATURE:
675 case ENVCTRL_RD_CPU_VOLTAGE:
676 /* Check to see if application passes in any cpu number,
677 * the default is cpu0.
678 */
679 infobuf = (char __user *) arg;
680 if (infobuf == NULL) {
681 read_cpu = 0;
682 }else {
683 get_user(read_cpu, infobuf);
684 }
685
686 /* Save the command for use when reading. */
687 file->private_data = (void *)(long)cmd;
688 break;
689
690 default:
691 return -EINVAL;
692 };
693
694 return 0;
695}
696
697/* Function Description: open device. Mapped to user open().
698 * Return: Always 0.
699 */
700static int
701envctrl_open(struct inode *inode, struct file *file)
702{
703 file->private_data = NULL;
704 return 0;
705}
706
707/* Function Description: Open device. Mapped to user close().
708 * Return: Always 0.
709 */
710static int
711envctrl_release(struct inode *inode, struct file *file)
712{
713 return 0;
714}
715
716static struct file_operations envctrl_fops = {
1928f8e5
CH		 717 .owner = THIS_MODULE,
718 .read = envctrl_read,
719 .unlocked_ioctl = envctrl_ioctl,
720#ifdef CONFIG_COMPAT
721 .compat_ioctl = envctrl_ioctl,
722#endif
723 .open = envctrl_open,
724 .release = envctrl_release,
1da177e4
LT		 725};
726
727static struct miscdevice envctrl_dev = {
728 ENVCTRL_MINOR,
729 "envctrl",
730 &envctrl_fops
731};
732
733/* Function Description: Set monitor type based on firmware description.
734 * Return: None.
735 */
736static void envctrl_set_mon(struct i2c_child_t *pchild,
737 char *chnl_desc,
738 int chnl_no)
739{
740 /* Firmware only has temperature type. It does not distinguish
741 * different kinds of temperatures. We use channel description
742 * to disinguish them.
743 */
744 if (!(strcmp(chnl_desc,"temp,cpu")) ||
745 !(strcmp(chnl_desc,"temp,cpu0")) ||
746 !(strcmp(chnl_desc,"temp,cpu1")) ||
747 !(strcmp(chnl_desc,"temp,cpu2")) ||
748 !(strcmp(chnl_desc,"temp,cpu3")))
749 pchild->mon_type[chnl_no] = ENVCTRL_CPUTEMP_MON;
750
751 if (!(strcmp(chnl_desc,"vddcore,cpu0")) ||
752 !(strcmp(chnl_desc,"vddcore,cpu1")) ||
753 !(strcmp(chnl_desc,"vddcore,cpu2")) ||
754 !(strcmp(chnl_desc,"vddcore,cpu3")))
755 pchild->mon_type[chnl_no] = ENVCTRL_CPUVOLTAGE_MON;
756
757 if (!(strcmp(chnl_desc,"temp,motherboard")))
758 pchild->mon_type[chnl_no] = ENVCTRL_MTHRBDTEMP_MON;
759
760 if (!(strcmp(chnl_desc,"temp,scsi")))
761 pchild->mon_type[chnl_no] = ENVCTRL_SCSITEMP_MON;
762
763 if (!(strcmp(chnl_desc,"temp,ethernet")))
764 pchild->mon_type[chnl_no] = ENVCTRL_ETHERTEMP_MON;
765}
766
767/* Function Description: Initialize monitor channel with channel desc,
768 * decoding tables, monitor type, optional properties.
769 * Return: None.
770 */
771static void envctrl_init_adc(struct i2c_child_t *pchild, int node)
772{
773 char chnls_desc[CHANNEL_DESC_SZ];
774 int i = 0, len;
775 char *pos = chnls_desc;
776
777 /* Firmware describe channels into a stream separated by a '\0'. */
778 len = prom_getproperty(node, "channels-description", chnls_desc,
779 CHANNEL_DESC_SZ);
780 chnls_desc[CHANNEL_DESC_SZ - 1] = '\0';
781
782 while (len > 0) {
783 int l = strlen(pos) + 1;
784 envctrl_set_mon(pchild, pos, i++);
785 len -= l;
786 pos += l;
787 }
788
789 /* Get optional properties. */
790 len = prom_getproperty(node, "warning-temp", (char *)&warning_temperature,
791 sizeof(warning_temperature));
792 len = prom_getproperty(node, "shutdown-temp", (char *)&shutdown_temperature,
793 sizeof(shutdown_temperature));
794}
795
796/* Function Description: Initialize child device monitoring fan status.
797 * Return: None.
798 */
799static void envctrl_init_fanstat(struct i2c_child_t *pchild)
800{
801 int i;
802
803 /* Go through all channels and set up the mask. */
804 for (i = 0; i < pchild->total_chnls; i++)
805 pchild->fan_mask |= chnls_mask[(pchild->chnl_array[i]).chnl_no];
806
807 /* We only need to know if this child has fan status monitored.
808 * We don't care which channels since we have the mask already.
809 */
810 pchild->mon_type[0] = ENVCTRL_FANSTAT_MON;
811}
812
813/* Function Description: Initialize child device for global addressing line.
814 * Return: None.
815 */
816static void envctrl_init_globaladdr(struct i2c_child_t *pchild)
817{
818 int i;
819
820 /* Voltage/PowerSupply monitoring is piggybacked
821 * with Global Address on CompactPCI. See comments
822 * within envctrl_i2c_globaladdr for bit assignments.
823 *
824 * The mask is created here by assigning mask bits to each
825 * bit position that represents PCF8584_VOLTAGE_TYPE data.
826 * Channel numbers are not consecutive within the globaladdr
827 * node (why?), so we use the actual counter value as chnls_mask
828 * index instead of the chnl_array[x].chnl_no value.
829 *
830 * NOTE: This loop could be replaced with a constant representing
831 * a mask of bits 5&6 (ENVCTRL_GLOBALADDR_PSTAT_MASK).
832 */
833 for (i = 0; i < pchild->total_chnls; i++) {
834 if (PCF8584_VOLTAGE_TYPE == pchild->chnl_array[i].type) {
835 pchild->voltage_mask |= chnls_mask[i];
836 }
837 }
838
839 /* We only need to know if this child has global addressing
840 * line monitored. We don't care which channels since we know
841 * the mask already (ENVCTRL_GLOBALADDR_ADDR_MASK).
842 */
843 pchild->mon_type[0] = ENVCTRL_GLOBALADDR_MON;
844}
845
846/* Initialize child device monitoring voltage status. */
847static void envctrl_init_voltage_status(struct i2c_child_t *pchild)
848{
849 int i;
850
851 /* Go through all channels and set up the mask. */
852 for (i = 0; i < pchild->total_chnls; i++)
853 pchild->voltage_mask |= chnls_mask[(pchild->chnl_array[i]).chnl_no];
854
855 /* We only need to know if this child has voltage status monitored.
856 * We don't care which channels since we have the mask already.
857 */
858 pchild->mon_type[0] = ENVCTRL_VOLTAGESTAT_MON;
859}
860
861/* Function Description: Initialize i2c child device.
862 * Return: None.
863 */
864static void envctrl_init_i2c_child(struct linux_ebus_child *edev_child,
865 struct i2c_child_t *pchild)
866{
867 int node, len, i, tbls_size = 0;
868
869 node = edev_child->prom_node;
870
871 /* Get device address. */
872 len = prom_getproperty(node, "reg",
873 (char *) &(pchild->addr),
874 sizeof(pchild->addr));
875
876 /* Get tables property. Read firmware temperature tables. */
877 len = prom_getproperty(node, "translation",
878 (char *) pchild->tblprop_array,
879 (PCF8584_MAX_CHANNELS *
880 sizeof(struct pcf8584_tblprop)));
881 if (len > 0) {
882 pchild->total_tbls = len / sizeof(struct pcf8584_tblprop);
883 for (i = 0; i < pchild->total_tbls; i++) {
884 if ((pchild->tblprop_array[i].size + pchild->tblprop_array[i].offset) > tbls_size) {
885 tbls_size = pchild->tblprop_array[i].size + pchild->tblprop_array[i].offset;
886 }
887 }
888
889 pchild->tables = kmalloc(tbls_size, GFP_KERNEL);
890 if (pchild->tables == NULL){
891 printk("envctrl: Failed to allocate table.\n");
892 return;
893 }
894 len = prom_getproperty(node, "tables",
895 (char *) pchild->tables, tbls_size);
896 if (len <= 0) {
897 printk("envctrl: Failed to get table.\n");
898 return;
899 }
900 }
901
902 /* SPARCengine ASM Reference Manual (ref. SMI doc 805-7581-04)
903 * sections 2.5, 3.5, 4.5 state node 0x70 for CP1400/1500 is
904 * "For Factory Use Only."
905 *
906 * We ignore the node on these platforms by assigning the
907 * 'NULL' monitor type.
908 */
909 if (ENVCTRL_CPCI_IGNORED_NODE == pchild->addr) {
910 int len;
911 char prop[56];
912
913 len = prom_getproperty(prom_root_node, "name", prop, sizeof(prop));
914 if (0 < len && (0 == strncmp(prop, "SUNW,UltraSPARC-IIi-cEngine", len)))
915 {
916 for (len = 0; len < PCF8584_MAX_CHANNELS; ++len) {
917 pchild->mon_type[len] = ENVCTRL_NOMON;
918 }
919 return;
920 }
921 }
922
923 /* Get the monitor channels. */
924 len = prom_getproperty(node, "channels-in-use",
925 (char *) pchild->chnl_array,
926 (PCF8584_MAX_CHANNELS *
927 sizeof(struct pcf8584_channel)));
928 pchild->total_chnls = len / sizeof(struct pcf8584_channel);
929
930 for (i = 0; i < pchild->total_chnls; i++) {
931 switch (pchild->chnl_array[i].type) {
932 case PCF8584_TEMP_TYPE:
933 envctrl_init_adc(pchild, node);
934 break;
935
936 case PCF8584_GLOBALADDR_TYPE:
937 envctrl_init_globaladdr(pchild);
938 i = pchild->total_chnls;
939 break;
940
941 case PCF8584_FANSTAT_TYPE:
942 envctrl_init_fanstat(pchild);
943 i = pchild->total_chnls;
944 break;
945
946 case PCF8584_VOLTAGE_TYPE:
947 if (pchild->i2ctype == I2C_ADC) {
948 envctrl_init_adc(pchild,node);
949 } else {
950 envctrl_init_voltage_status(pchild);
951 }
952 i = pchild->total_chnls;
953 break;
954
955 default:
956 break;
957 };
958 }
959}
960
961/* Function Description: Search the child device list for a device.
962 * Return : The i2c child if found. NULL otherwise.
963 */
964static struct i2c_child_t *envctrl_get_i2c_child(unsigned char mon_type)
965{
966 int i, j;
967
968 for (i = 0; i < ENVCTRL_MAX_CPU*2; i++) {
969 for (j = 0; j < PCF8584_MAX_CHANNELS; j++) {
970 if (i2c_childlist[i].mon_type[j] == mon_type) {
971 return (struct i2c_child_t *)(&(i2c_childlist[i]));
972 }
973 }
974 }
975 return NULL;
976}
977
978static void envctrl_do_shutdown(void)
979{
980 static int inprog = 0;
981 static char *envp[] = {
982 "HOME=/", "TERM=linux", "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL };
983 char *argv[] = {
984 "/sbin/shutdown", "-h", "now", NULL };
985
986 if (inprog != 0)
987 return;
988
989 inprog = 1;
990 printk(KERN_CRIT "kenvctrld: WARNING: Shutting down the system now.\n");
991 if (0 > execve("/sbin/shutdown", argv, envp)) {
992 printk(KERN_CRIT "kenvctrld: WARNING: system shutdown failed!\n");
993 inprog = 0; /* unlikely to succeed, but we could try again */
994 }
995}
996
997static struct task_struct *kenvctrld_task;
998
999static int kenvctrld(void *__unused)
1000{
1001 int poll_interval;
1002 int whichcpu;
1003 char tempbuf[10];
1004 struct i2c_child_t *cputemp;
1005
1006 if (NULL == (cputemp = envctrl_get_i2c_child(ENVCTRL_CPUTEMP_MON))) {
1007 printk(KERN_ERR
1008 "envctrl: kenvctrld unable to monitor CPU temp-- exiting\n");
1009 return -ENODEV;
1010 }
1011
cb39d263 1012 poll_interval = 5000; /* TODO env_mon_interval */
1da177e4 1013
1da177e4
LT		 1014 printk(KERN_INFO "envctrl: %s starting...\n", current->comm);
1015 for (;;) {
218b29e0 1016 msleep_interruptible(poll_interval);
1da177e4 1017
218b29e0
CH		 1018 if (kthread_should_stop())
1019 break;
1020
1da177e4
LT		 1021 for (whichcpu = 0; whichcpu < ENVCTRL_MAX_CPU; ++whichcpu) {
1022 if (0 < envctrl_read_cpu_info(whichcpu, cputemp,
1023 ENVCTRL_CPUTEMP_MON,
1024 tempbuf)) {
1025 if (tempbuf[0] >= shutdown_temperature) {
1026 printk(KERN_CRIT
1027 "%s: WARNING: CPU%i temperature %i C meets or exceeds "\
1028 "shutdown threshold %i C\n",
1029 current->comm, whichcpu,
1030 tempbuf[0], shutdown_temperature);
1031 envctrl_do_shutdown();
1032 }
1033 }
1034 }
1035 }
1036 printk(KERN_INFO "envctrl: %s exiting...\n", current->comm);
1037 return 0;
1038}
1039
1040static int __init envctrl_init(void)
1041{
1da177e4
LT		 1042 struct linux_ebus *ebus = NULL;
1043 struct linux_ebus_device *edev = NULL;
1044 struct linux_ebus_child *edev_child = NULL;
1045 int err, i = 0;
1046
1047 for_each_ebus(ebus) {
1048 for_each_ebusdev(edev, ebus) {
1049 if (!strcmp(edev->prom_name, "bbc")) {
1050 /* If we find a boot-bus controller node,
1051 * then this envctrl driver is not for us.
1052 */
1053 return -ENODEV;
1054 }
1055 }
1056 }
1057
1058 /* Traverse through ebus and ebus device list for i2c device and
1059 * adc and gpio nodes.
1060 */
1061 for_each_ebus(ebus) {
1062 for_each_ebusdev(edev, ebus) {
1063 if (!strcmp(edev->prom_name, "i2c")) {
1064 i2c = ioremap(edev->resource[0].start, 0x2);
1065 for_each_edevchild(edev, edev_child) {
1066 if (!strcmp("gpio", edev_child->prom_name)) {
1067 i2c_childlist[i].i2ctype = I2C_GPIO;
1068 envctrl_init_i2c_child(edev_child, &(i2c_childlist[i++]));
1069 }
1070 if (!strcmp("adc", edev_child->prom_name)) {
1071 i2c_childlist[i].i2ctype = I2C_ADC;
1072 envctrl_init_i2c_child(edev_child, &(i2c_childlist[i++]));
1073 }
1074 }
1075 goto done;
1076 }
1077 }
1078 }
1079
1080done:
1081 if (!edev) {
1082 printk("envctrl: I2C device not found.\n");
1083 return -ENODEV;
1084 }
1085
1086 /* Set device address. */
1087 writeb(CONTROL_PIN, i2c + PCF8584_CSR);
1088 writeb(PCF8584_ADDRESS, i2c + PCF8584_DATA);
1089
1090 /* Set system clock and SCL frequencies. */
1091 writeb(CONTROL_PIN | CONTROL_ES1, i2c + PCF8584_CSR);
1092 writeb(CLK_4_43 | BUS_CLK_90, i2c + PCF8584_DATA);
1093
1094 /* Enable serial interface. */
1095 writeb(CONTROL_PIN | CONTROL_ES0 | CONTROL_ACK, i2c + PCF8584_CSR);
1096 udelay(200);
1097
1098 /* Register the device as a minor miscellaneous device. */
1099 err = misc_register(&envctrl_dev);
1100 if (err) {
1101 printk("envctrl: Unable to get misc minor %d\n",
1102 envctrl_dev.minor);
1103 goto out_iounmap;
1104 }
1105
1106 /* Note above traversal routine post-incremented 'i' to accommodate
1107 * a next child device, so we decrement before reverse-traversal of
1108 * child devices.
1109 */
1110 printk("envctrl: initialized ");
1111 for (--i; i >= 0; --i) {
1112 printk("[%s 0x%lx]%s",
1113 (I2C_ADC == i2c_childlist[i].i2ctype) ? ("adc") :
1114 ((I2C_GPIO == i2c_childlist[i].i2ctype) ? ("gpio") : ("unknown")),
1115 i2c_childlist[i].addr, (0 == i) ? ("\n") : (" "));
1116 }
1117
218b29e0
CH		 1118 kenvctrld_task = kthread_run(kenvctrld, NULL, "kenvctrld");
1119 if (IS_ERR(kenvctrld_task)) {
38c1844b 1120 err = PTR_ERR(kenvctrld_task);
1da177e4 1121 goto out_deregister;
218b29e0 1122 }
1da177e4
LT		 1123
1124 return 0;
1125
1126out_deregister:
1127 misc_deregister(&envctrl_dev);
1128out_iounmap:
1129 iounmap(i2c);
6044ec88
JJ		 1130 for (i = 0; i < ENVCTRL_MAX_CPU * 2; i++)
1131 kfree(i2c_childlist[i].tables);
1132
1da177e4 1133 return err;
1da177e4
LT		 1134}
1135
1136static void __exit envctrl_cleanup(void)
1137{
1138 int i;
1139
218b29e0 1140 kthread_stop(kenvctrld_task);
1da177e4
LT		 1141
1142 iounmap(i2c);
1143 misc_deregister(&envctrl_dev);
1144
6044ec88
JJ		 1145 for (i = 0; i < ENVCTRL_MAX_CPU * 2; i++)
1146 kfree(i2c_childlist[i].tables);
1da177e4
LT		 1147}
1148
1149module_init(envctrl_init);
1150module_exit(envctrl_cleanup);
1151MODULE_LICENSE("GPL");
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