ath5k: correct padding in tx descriptors
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / macintosh / smu.c
blob77ad192962c55acac9cba759471890a4538f5625
1 /*
2 * PowerMac G5 SMU driver
4 * Copyright 2004 J. Mayer <l_indien@magic.fr>
5 * Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
7 * Released under the term of the GNU GPL v2.
8 */
11 * TODO:
12 * - maybe add timeout to commands ?
13 * - blocking version of time functions
14 * - polling version of i2c commands (including timer that works with
15 * interrupts off)
16 * - maybe avoid some data copies with i2c by directly using the smu cmd
17 * buffer and a lower level internal interface
18 * - understand SMU -> CPU events and implement reception of them via
19 * the userland interface
22 #include <linux/types.h>
23 #include <linux/kernel.h>
24 #include <linux/device.h>
25 #include <linux/dmapool.h>
26 #include <linux/bootmem.h>
27 #include <linux/vmalloc.h>
28 #include <linux/highmem.h>
29 #include <linux/jiffies.h>
30 #include <linux/interrupt.h>
31 #include <linux/rtc.h>
32 #include <linux/completion.h>
33 #include <linux/miscdevice.h>
34 #include <linux/delay.h>
35 #include <linux/sysdev.h>
36 #include <linux/poll.h>
37 #include <linux/mutex.h>
39 #include <asm/byteorder.h>
40 #include <asm/io.h>
41 #include <asm/prom.h>
42 #include <asm/machdep.h>
43 #include <asm/pmac_feature.h>
44 #include <asm/smu.h>
45 #include <asm/sections.h>
46 #include <asm/abs_addr.h>
47 #include <asm/uaccess.h>
48 #include <asm/of_device.h>
49 #include <asm/of_platform.h>
51 #define VERSION "0.7"
52 #define AUTHOR "(c) 2005 Benjamin Herrenschmidt, IBM Corp."
54 #undef DEBUG_SMU
56 #ifdef DEBUG_SMU
57 #define DPRINTK(fmt, args...) do { printk(KERN_DEBUG fmt , ##args); } while (0)
58 #else
59 #define DPRINTK(fmt, args...) do { } while (0)
60 #endif
63 * This is the command buffer passed to the SMU hardware
65 #define SMU_MAX_DATA 254
67 struct smu_cmd_buf {
68 u8 cmd;
69 u8 length;
70 u8 data[SMU_MAX_DATA];
73 struct smu_device {
74 spinlock_t lock;
75 struct device_node *of_node;
76 struct of_device *of_dev;
77 int doorbell; /* doorbell gpio */
78 u32 __iomem *db_buf; /* doorbell buffer */
79 struct device_node *db_node;
80 unsigned int db_irq;
81 int msg;
82 struct device_node *msg_node;
83 unsigned int msg_irq;
84 struct smu_cmd_buf *cmd_buf; /* command buffer virtual */
85 u32 cmd_buf_abs; /* command buffer absolute */
86 struct list_head cmd_list;
87 struct smu_cmd *cmd_cur; /* pending command */
88 int broken_nap;
89 struct list_head cmd_i2c_list;
90 struct smu_i2c_cmd *cmd_i2c_cur; /* pending i2c command */
91 struct timer_list i2c_timer;
95 * I don't think there will ever be more than one SMU, so
96 * for now, just hard code that
98 static struct smu_device *smu;
99 static DEFINE_MUTEX(smu_part_access);
100 static int smu_irq_inited;
102 static void smu_i2c_retry(unsigned long data);
105 * SMU driver low level stuff
108 static void smu_start_cmd(void)
110 unsigned long faddr, fend;
111 struct smu_cmd *cmd;
113 if (list_empty(&smu->cmd_list))
114 return;
116 /* Fetch first command in queue */
117 cmd = list_entry(smu->cmd_list.next, struct smu_cmd, link);
118 smu->cmd_cur = cmd;
119 list_del(&cmd->link);
121 DPRINTK("SMU: starting cmd %x, %d bytes data\n", cmd->cmd,
122 cmd->data_len);
123 DPRINTK("SMU: data buffer: %02x %02x %02x %02x %02x %02x %02x %02x\n",
124 ((u8 *)cmd->data_buf)[0], ((u8 *)cmd->data_buf)[1],
125 ((u8 *)cmd->data_buf)[2], ((u8 *)cmd->data_buf)[3],
126 ((u8 *)cmd->data_buf)[4], ((u8 *)cmd->data_buf)[5],
127 ((u8 *)cmd->data_buf)[6], ((u8 *)cmd->data_buf)[7]);
129 /* Fill the SMU command buffer */
130 smu->cmd_buf->cmd = cmd->cmd;
131 smu->cmd_buf->length = cmd->data_len;
132 memcpy(smu->cmd_buf->data, cmd->data_buf, cmd->data_len);
134 /* Flush command and data to RAM */
135 faddr = (unsigned long)smu->cmd_buf;
136 fend = faddr + smu->cmd_buf->length + 2;
137 flush_inval_dcache_range(faddr, fend);
140 /* We also disable NAP mode for the duration of the command
141 * on U3 based machines.
142 * This is slightly racy as it can be written back to 1 by a sysctl
143 * but that never happens in practice. There seem to be an issue with
144 * U3 based machines such as the iMac G5 where napping for the
145 * whole duration of the command prevents the SMU from fetching it
146 * from memory. This might be related to the strange i2c based
147 * mechanism the SMU uses to access memory.
149 if (smu->broken_nap)
150 powersave_nap = 0;
152 /* This isn't exactly a DMA mapping here, I suspect
153 * the SMU is actually communicating with us via i2c to the
154 * northbridge or the CPU to access RAM.
156 writel(smu->cmd_buf_abs, smu->db_buf);
158 /* Ring the SMU doorbell */
159 pmac_do_feature_call(PMAC_FTR_WRITE_GPIO, NULL, smu->doorbell, 4);
163 static irqreturn_t smu_db_intr(int irq, void *arg)
165 unsigned long flags;
166 struct smu_cmd *cmd;
167 void (*done)(struct smu_cmd *cmd, void *misc) = NULL;
168 void *misc = NULL;
169 u8 gpio;
170 int rc = 0;
172 /* SMU completed the command, well, we hope, let's make sure
173 * of it
175 spin_lock_irqsave(&smu->lock, flags);
177 gpio = pmac_do_feature_call(PMAC_FTR_READ_GPIO, NULL, smu->doorbell);
178 if ((gpio & 7) != 7) {
179 spin_unlock_irqrestore(&smu->lock, flags);
180 return IRQ_HANDLED;
183 cmd = smu->cmd_cur;
184 smu->cmd_cur = NULL;
185 if (cmd == NULL)
186 goto bail;
188 if (rc == 0) {
189 unsigned long faddr;
190 int reply_len;
191 u8 ack;
193 /* CPU might have brought back the cache line, so we need
194 * to flush again before peeking at the SMU response. We
195 * flush the entire buffer for now as we haven't read the
196 * reply length (it's only 2 cache lines anyway)
198 faddr = (unsigned long)smu->cmd_buf;
199 flush_inval_dcache_range(faddr, faddr + 256);
201 /* Now check ack */
202 ack = (~cmd->cmd) & 0xff;
203 if (ack != smu->cmd_buf->cmd) {
204 DPRINTK("SMU: incorrect ack, want %x got %x\n",
205 ack, smu->cmd_buf->cmd);
206 rc = -EIO;
208 reply_len = rc == 0 ? smu->cmd_buf->length : 0;
209 DPRINTK("SMU: reply len: %d\n", reply_len);
210 if (reply_len > cmd->reply_len) {
211 printk(KERN_WARNING "SMU: reply buffer too small,"
212 "got %d bytes for a %d bytes buffer\n",
213 reply_len, cmd->reply_len);
214 reply_len = cmd->reply_len;
216 cmd->reply_len = reply_len;
217 if (cmd->reply_buf && reply_len)
218 memcpy(cmd->reply_buf, smu->cmd_buf->data, reply_len);
221 /* Now complete the command. Write status last in order as we lost
222 * ownership of the command structure as soon as it's no longer -1
224 done = cmd->done;
225 misc = cmd->misc;
226 mb();
227 cmd->status = rc;
229 /* Re-enable NAP mode */
230 if (smu->broken_nap)
231 powersave_nap = 1;
232 bail:
233 /* Start next command if any */
234 smu_start_cmd();
235 spin_unlock_irqrestore(&smu->lock, flags);
237 /* Call command completion handler if any */
238 if (done)
239 done(cmd, misc);
241 /* It's an edge interrupt, nothing to do */
242 return IRQ_HANDLED;
246 static irqreturn_t smu_msg_intr(int irq, void *arg)
248 /* I don't quite know what to do with this one, we seem to never
249 * receive it, so I suspect we have to arm it someway in the SMU
250 * to start getting events that way.
253 printk(KERN_INFO "SMU: message interrupt !\n");
255 /* It's an edge interrupt, nothing to do */
256 return IRQ_HANDLED;
261 * Queued command management.
265 int smu_queue_cmd(struct smu_cmd *cmd)
267 unsigned long flags;
269 if (smu == NULL)
270 return -ENODEV;
271 if (cmd->data_len > SMU_MAX_DATA ||
272 cmd->reply_len > SMU_MAX_DATA)
273 return -EINVAL;
275 cmd->status = 1;
276 spin_lock_irqsave(&smu->lock, flags);
277 list_add_tail(&cmd->link, &smu->cmd_list);
278 if (smu->cmd_cur == NULL)
279 smu_start_cmd();
280 spin_unlock_irqrestore(&smu->lock, flags);
282 /* Workaround for early calls when irq isn't available */
283 if (!smu_irq_inited || smu->db_irq == NO_IRQ)
284 smu_spinwait_cmd(cmd);
286 return 0;
288 EXPORT_SYMBOL(smu_queue_cmd);
291 int smu_queue_simple(struct smu_simple_cmd *scmd, u8 command,
292 unsigned int data_len,
293 void (*done)(struct smu_cmd *cmd, void *misc),
294 void *misc, ...)
296 struct smu_cmd *cmd = &scmd->cmd;
297 va_list list;
298 int i;
300 if (data_len > sizeof(scmd->buffer))
301 return -EINVAL;
303 memset(scmd, 0, sizeof(*scmd));
304 cmd->cmd = command;
305 cmd->data_len = data_len;
306 cmd->data_buf = scmd->buffer;
307 cmd->reply_len = sizeof(scmd->buffer);
308 cmd->reply_buf = scmd->buffer;
309 cmd->done = done;
310 cmd->misc = misc;
312 va_start(list, misc);
313 for (i = 0; i < data_len; ++i)
314 scmd->buffer[i] = (u8)va_arg(list, int);
315 va_end(list);
317 return smu_queue_cmd(cmd);
319 EXPORT_SYMBOL(smu_queue_simple);
322 void smu_poll(void)
324 u8 gpio;
326 if (smu == NULL)
327 return;
329 gpio = pmac_do_feature_call(PMAC_FTR_READ_GPIO, NULL, smu->doorbell);
330 if ((gpio & 7) == 7)
331 smu_db_intr(smu->db_irq, smu);
333 EXPORT_SYMBOL(smu_poll);
336 void smu_done_complete(struct smu_cmd *cmd, void *misc)
338 struct completion *comp = misc;
340 complete(comp);
342 EXPORT_SYMBOL(smu_done_complete);
345 void smu_spinwait_cmd(struct smu_cmd *cmd)
347 while(cmd->status == 1)
348 smu_poll();
350 EXPORT_SYMBOL(smu_spinwait_cmd);
353 /* RTC low level commands */
354 static inline int bcd2hex (int n)
356 return (((n & 0xf0) >> 4) * 10) + (n & 0xf);
360 static inline int hex2bcd (int n)
362 return ((n / 10) << 4) + (n % 10);
366 static inline void smu_fill_set_rtc_cmd(struct smu_cmd_buf *cmd_buf,
367 struct rtc_time *time)
369 cmd_buf->cmd = 0x8e;
370 cmd_buf->length = 8;
371 cmd_buf->data[0] = 0x80;
372 cmd_buf->data[1] = hex2bcd(time->tm_sec);
373 cmd_buf->data[2] = hex2bcd(time->tm_min);
374 cmd_buf->data[3] = hex2bcd(time->tm_hour);
375 cmd_buf->data[4] = time->tm_wday;
376 cmd_buf->data[5] = hex2bcd(time->tm_mday);
377 cmd_buf->data[6] = hex2bcd(time->tm_mon) + 1;
378 cmd_buf->data[7] = hex2bcd(time->tm_year - 100);
382 int smu_get_rtc_time(struct rtc_time *time, int spinwait)
384 struct smu_simple_cmd cmd;
385 int rc;
387 if (smu == NULL)
388 return -ENODEV;
390 memset(time, 0, sizeof(struct rtc_time));
391 rc = smu_queue_simple(&cmd, SMU_CMD_RTC_COMMAND, 1, NULL, NULL,
392 SMU_CMD_RTC_GET_DATETIME);
393 if (rc)
394 return rc;
395 smu_spinwait_simple(&cmd);
397 time->tm_sec = bcd2hex(cmd.buffer[0]);
398 time->tm_min = bcd2hex(cmd.buffer[1]);
399 time->tm_hour = bcd2hex(cmd.buffer[2]);
400 time->tm_wday = bcd2hex(cmd.buffer[3]);
401 time->tm_mday = bcd2hex(cmd.buffer[4]);
402 time->tm_mon = bcd2hex(cmd.buffer[5]) - 1;
403 time->tm_year = bcd2hex(cmd.buffer[6]) + 100;
405 return 0;
409 int smu_set_rtc_time(struct rtc_time *time, int spinwait)
411 struct smu_simple_cmd cmd;
412 int rc;
414 if (smu == NULL)
415 return -ENODEV;
417 rc = smu_queue_simple(&cmd, SMU_CMD_RTC_COMMAND, 8, NULL, NULL,
418 SMU_CMD_RTC_SET_DATETIME,
419 hex2bcd(time->tm_sec),
420 hex2bcd(time->tm_min),
421 hex2bcd(time->tm_hour),
422 time->tm_wday,
423 hex2bcd(time->tm_mday),
424 hex2bcd(time->tm_mon) + 1,
425 hex2bcd(time->tm_year - 100));
426 if (rc)
427 return rc;
428 smu_spinwait_simple(&cmd);
430 return 0;
434 void smu_shutdown(void)
436 struct smu_simple_cmd cmd;
438 if (smu == NULL)
439 return;
441 if (smu_queue_simple(&cmd, SMU_CMD_POWER_COMMAND, 9, NULL, NULL,
442 'S', 'H', 'U', 'T', 'D', 'O', 'W', 'N', 0))
443 return;
444 smu_spinwait_simple(&cmd);
445 for (;;)
450 void smu_restart(void)
452 struct smu_simple_cmd cmd;
454 if (smu == NULL)
455 return;
457 if (smu_queue_simple(&cmd, SMU_CMD_POWER_COMMAND, 8, NULL, NULL,
458 'R', 'E', 'S', 'T', 'A', 'R', 'T', 0))
459 return;
460 smu_spinwait_simple(&cmd);
461 for (;;)
466 int smu_present(void)
468 return smu != NULL;
470 EXPORT_SYMBOL(smu_present);
473 int __init smu_init (void)
475 struct device_node *np;
476 const u32 *data;
478 np = of_find_node_by_type(NULL, "smu");
479 if (np == NULL)
480 return -ENODEV;
482 printk(KERN_INFO "SMU: Driver %s %s\n", VERSION, AUTHOR);
484 if (smu_cmdbuf_abs == 0) {
485 printk(KERN_ERR "SMU: Command buffer not allocated !\n");
486 return -EINVAL;
489 smu = alloc_bootmem(sizeof(struct smu_device));
490 if (smu == NULL)
491 return -ENOMEM;
492 memset(smu, 0, sizeof(*smu));
494 spin_lock_init(&smu->lock);
495 INIT_LIST_HEAD(&smu->cmd_list);
496 INIT_LIST_HEAD(&smu->cmd_i2c_list);
497 smu->of_node = np;
498 smu->db_irq = NO_IRQ;
499 smu->msg_irq = NO_IRQ;
501 /* smu_cmdbuf_abs is in the low 2G of RAM, can be converted to a
502 * 32 bits value safely
504 smu->cmd_buf_abs = (u32)smu_cmdbuf_abs;
505 smu->cmd_buf = (struct smu_cmd_buf *)abs_to_virt(smu_cmdbuf_abs);
507 smu->db_node = of_find_node_by_name(NULL, "smu-doorbell");
508 if (smu->db_node == NULL) {
509 printk(KERN_ERR "SMU: Can't find doorbell GPIO !\n");
510 goto fail;
512 data = of_get_property(smu->db_node, "reg", NULL);
513 if (data == NULL) {
514 of_node_put(smu->db_node);
515 smu->db_node = NULL;
516 printk(KERN_ERR "SMU: Can't find doorbell GPIO address !\n");
517 goto fail;
520 /* Current setup has one doorbell GPIO that does both doorbell
521 * and ack. GPIOs are at 0x50, best would be to find that out
522 * in the device-tree though.
524 smu->doorbell = *data;
525 if (smu->doorbell < 0x50)
526 smu->doorbell += 0x50;
528 /* Now look for the smu-interrupt GPIO */
529 do {
530 smu->msg_node = of_find_node_by_name(NULL, "smu-interrupt");
531 if (smu->msg_node == NULL)
532 break;
533 data = of_get_property(smu->msg_node, "reg", NULL);
534 if (data == NULL) {
535 of_node_put(smu->msg_node);
536 smu->msg_node = NULL;
537 break;
539 smu->msg = *data;
540 if (smu->msg < 0x50)
541 smu->msg += 0x50;
542 } while(0);
544 /* Doorbell buffer is currently hard-coded, I didn't find a proper
545 * device-tree entry giving the address. Best would probably to use
546 * an offset for K2 base though, but let's do it that way for now.
548 smu->db_buf = ioremap(0x8000860c, 0x1000);
549 if (smu->db_buf == NULL) {
550 printk(KERN_ERR "SMU: Can't map doorbell buffer pointer !\n");
551 goto fail;
554 /* U3 has an issue with NAP mode when issuing SMU commands */
555 smu->broken_nap = pmac_get_uninorth_variant() < 4;
556 if (smu->broken_nap)
557 printk(KERN_INFO "SMU: using NAP mode workaround\n");
559 sys_ctrler = SYS_CTRLER_SMU;
560 return 0;
562 fail:
563 smu = NULL;
564 return -ENXIO;
569 static int smu_late_init(void)
571 if (!smu)
572 return 0;
574 init_timer(&smu->i2c_timer);
575 smu->i2c_timer.function = smu_i2c_retry;
576 smu->i2c_timer.data = (unsigned long)smu;
578 if (smu->db_node) {
579 smu->db_irq = irq_of_parse_and_map(smu->db_node, 0);
580 if (smu->db_irq == NO_IRQ)
581 printk(KERN_ERR "smu: failed to map irq for node %s\n",
582 smu->db_node->full_name);
584 if (smu->msg_node) {
585 smu->msg_irq = irq_of_parse_and_map(smu->msg_node, 0);
586 if (smu->msg_irq == NO_IRQ)
587 printk(KERN_ERR "smu: failed to map irq for node %s\n",
588 smu->msg_node->full_name);
592 * Try to request the interrupts
595 if (smu->db_irq != NO_IRQ) {
596 if (request_irq(smu->db_irq, smu_db_intr,
597 IRQF_SHARED, "SMU doorbell", smu) < 0) {
598 printk(KERN_WARNING "SMU: can't "
599 "request interrupt %d\n",
600 smu->db_irq);
601 smu->db_irq = NO_IRQ;
605 if (smu->msg_irq != NO_IRQ) {
606 if (request_irq(smu->msg_irq, smu_msg_intr,
607 IRQF_SHARED, "SMU message", smu) < 0) {
608 printk(KERN_WARNING "SMU: can't "
609 "request interrupt %d\n",
610 smu->msg_irq);
611 smu->msg_irq = NO_IRQ;
615 smu_irq_inited = 1;
616 return 0;
618 /* This has to be before arch_initcall as the low i2c stuff relies on the
619 * above having been done before we reach arch_initcalls
621 core_initcall(smu_late_init);
624 * sysfs visibility
627 static void smu_expose_childs(struct work_struct *unused)
629 struct device_node *np;
631 for (np = NULL; (np = of_get_next_child(smu->of_node, np)) != NULL;)
632 if (of_device_is_compatible(np, "smu-sensors"))
633 of_platform_device_create(np, "smu-sensors",
634 &smu->of_dev->dev);
637 static DECLARE_WORK(smu_expose_childs_work, smu_expose_childs);
639 static int smu_platform_probe(struct of_device* dev,
640 const struct of_device_id *match)
642 if (!smu)
643 return -ENODEV;
644 smu->of_dev = dev;
647 * Ok, we are matched, now expose all i2c busses. We have to defer
648 * that unfortunately or it would deadlock inside the device model
650 schedule_work(&smu_expose_childs_work);
652 return 0;
655 static struct of_device_id smu_platform_match[] =
658 .type = "smu",
663 static struct of_platform_driver smu_of_platform_driver =
665 .name = "smu",
666 .match_table = smu_platform_match,
667 .probe = smu_platform_probe,
670 static int __init smu_init_sysfs(void)
673 * Due to sysfs bogosity, a sysdev is not a real device, so
674 * we should in fact create both if we want sysdev semantics
675 * for power management.
676 * For now, we don't power manage machines with an SMU chip,
677 * I'm a bit too far from figuring out how that works with those
678 * new chipsets, but that will come back and bite us
680 of_register_platform_driver(&smu_of_platform_driver);
681 return 0;
684 device_initcall(smu_init_sysfs);
686 struct of_device *smu_get_ofdev(void)
688 if (!smu)
689 return NULL;
690 return smu->of_dev;
693 EXPORT_SYMBOL_GPL(smu_get_ofdev);
696 * i2c interface
699 static void smu_i2c_complete_command(struct smu_i2c_cmd *cmd, int fail)
701 void (*done)(struct smu_i2c_cmd *cmd, void *misc) = cmd->done;
702 void *misc = cmd->misc;
703 unsigned long flags;
705 /* Check for read case */
706 if (!fail && cmd->read) {
707 if (cmd->pdata[0] < 1)
708 fail = 1;
709 else
710 memcpy(cmd->info.data, &cmd->pdata[1],
711 cmd->info.datalen);
714 DPRINTK("SMU: completing, success: %d\n", !fail);
716 /* Update status and mark no pending i2c command with lock
717 * held so nobody comes in while we dequeue an eventual
718 * pending next i2c command
720 spin_lock_irqsave(&smu->lock, flags);
721 smu->cmd_i2c_cur = NULL;
722 wmb();
723 cmd->status = fail ? -EIO : 0;
725 /* Is there another i2c command waiting ? */
726 if (!list_empty(&smu->cmd_i2c_list)) {
727 struct smu_i2c_cmd *newcmd;
729 /* Fetch it, new current, remove from list */
730 newcmd = list_entry(smu->cmd_i2c_list.next,
731 struct smu_i2c_cmd, link);
732 smu->cmd_i2c_cur = newcmd;
733 list_del(&cmd->link);
735 /* Queue with low level smu */
736 list_add_tail(&cmd->scmd.link, &smu->cmd_list);
737 if (smu->cmd_cur == NULL)
738 smu_start_cmd();
740 spin_unlock_irqrestore(&smu->lock, flags);
742 /* Call command completion handler if any */
743 if (done)
744 done(cmd, misc);
749 static void smu_i2c_retry(unsigned long data)
751 struct smu_i2c_cmd *cmd = smu->cmd_i2c_cur;
753 DPRINTK("SMU: i2c failure, requeuing...\n");
755 /* requeue command simply by resetting reply_len */
756 cmd->pdata[0] = 0xff;
757 cmd->scmd.reply_len = sizeof(cmd->pdata);
758 smu_queue_cmd(&cmd->scmd);
762 static void smu_i2c_low_completion(struct smu_cmd *scmd, void *misc)
764 struct smu_i2c_cmd *cmd = misc;
765 int fail = 0;
767 DPRINTK("SMU: i2c compl. stage=%d status=%x pdata[0]=%x rlen: %x\n",
768 cmd->stage, scmd->status, cmd->pdata[0], scmd->reply_len);
770 /* Check for possible status */
771 if (scmd->status < 0)
772 fail = 1;
773 else if (cmd->read) {
774 if (cmd->stage == 0)
775 fail = cmd->pdata[0] != 0;
776 else
777 fail = cmd->pdata[0] >= 0x80;
778 } else {
779 fail = cmd->pdata[0] != 0;
782 /* Handle failures by requeuing command, after 5ms interval
784 if (fail && --cmd->retries > 0) {
785 DPRINTK("SMU: i2c failure, starting timer...\n");
786 BUG_ON(cmd != smu->cmd_i2c_cur);
787 if (!smu_irq_inited) {
788 mdelay(5);
789 smu_i2c_retry(0);
790 return;
792 mod_timer(&smu->i2c_timer, jiffies + msecs_to_jiffies(5));
793 return;
796 /* If failure or stage 1, command is complete */
797 if (fail || cmd->stage != 0) {
798 smu_i2c_complete_command(cmd, fail);
799 return;
802 DPRINTK("SMU: going to stage 1\n");
804 /* Ok, initial command complete, now poll status */
805 scmd->reply_buf = cmd->pdata;
806 scmd->reply_len = sizeof(cmd->pdata);
807 scmd->data_buf = cmd->pdata;
808 scmd->data_len = 1;
809 cmd->pdata[0] = 0;
810 cmd->stage = 1;
811 cmd->retries = 20;
812 smu_queue_cmd(scmd);
816 int smu_queue_i2c(struct smu_i2c_cmd *cmd)
818 unsigned long flags;
820 if (smu == NULL)
821 return -ENODEV;
823 /* Fill most fields of scmd */
824 cmd->scmd.cmd = SMU_CMD_I2C_COMMAND;
825 cmd->scmd.done = smu_i2c_low_completion;
826 cmd->scmd.misc = cmd;
827 cmd->scmd.reply_buf = cmd->pdata;
828 cmd->scmd.reply_len = sizeof(cmd->pdata);
829 cmd->scmd.data_buf = (u8 *)(char *)&cmd->info;
830 cmd->scmd.status = 1;
831 cmd->stage = 0;
832 cmd->pdata[0] = 0xff;
833 cmd->retries = 20;
834 cmd->status = 1;
836 /* Check transfer type, sanitize some "info" fields
837 * based on transfer type and do more checking
839 cmd->info.caddr = cmd->info.devaddr;
840 cmd->read = cmd->info.devaddr & 0x01;
841 switch(cmd->info.type) {
842 case SMU_I2C_TRANSFER_SIMPLE:
843 memset(&cmd->info.sublen, 0, 4);
844 break;
845 case SMU_I2C_TRANSFER_COMBINED:
846 cmd->info.devaddr &= 0xfe;
847 case SMU_I2C_TRANSFER_STDSUB:
848 if (cmd->info.sublen > 3)
849 return -EINVAL;
850 break;
851 default:
852 return -EINVAL;
855 /* Finish setting up command based on transfer direction
857 if (cmd->read) {
858 if (cmd->info.datalen > SMU_I2C_READ_MAX)
859 return -EINVAL;
860 memset(cmd->info.data, 0xff, cmd->info.datalen);
861 cmd->scmd.data_len = 9;
862 } else {
863 if (cmd->info.datalen > SMU_I2C_WRITE_MAX)
864 return -EINVAL;
865 cmd->scmd.data_len = 9 + cmd->info.datalen;
868 DPRINTK("SMU: i2c enqueuing command\n");
869 DPRINTK("SMU: %s, len=%d bus=%x addr=%x sub0=%x type=%x\n",
870 cmd->read ? "read" : "write", cmd->info.datalen,
871 cmd->info.bus, cmd->info.caddr,
872 cmd->info.subaddr[0], cmd->info.type);
875 /* Enqueue command in i2c list, and if empty, enqueue also in
876 * main command list
878 spin_lock_irqsave(&smu->lock, flags);
879 if (smu->cmd_i2c_cur == NULL) {
880 smu->cmd_i2c_cur = cmd;
881 list_add_tail(&cmd->scmd.link, &smu->cmd_list);
882 if (smu->cmd_cur == NULL)
883 smu_start_cmd();
884 } else
885 list_add_tail(&cmd->link, &smu->cmd_i2c_list);
886 spin_unlock_irqrestore(&smu->lock, flags);
888 return 0;
892 * Handling of "partitions"
895 static int smu_read_datablock(u8 *dest, unsigned int addr, unsigned int len)
897 DECLARE_COMPLETION_ONSTACK(comp);
898 unsigned int chunk;
899 struct smu_cmd cmd;
900 int rc;
901 u8 params[8];
903 /* We currently use a chunk size of 0xe. We could check the
904 * SMU firmware version and use bigger sizes though
906 chunk = 0xe;
908 while (len) {
909 unsigned int clen = min(len, chunk);
911 cmd.cmd = SMU_CMD_MISC_ee_COMMAND;
912 cmd.data_len = 7;
913 cmd.data_buf = params;
914 cmd.reply_len = chunk;
915 cmd.reply_buf = dest;
916 cmd.done = smu_done_complete;
917 cmd.misc = &comp;
918 params[0] = SMU_CMD_MISC_ee_GET_DATABLOCK_REC;
919 params[1] = 0x4;
920 *((u32 *)&params[2]) = addr;
921 params[6] = clen;
923 rc = smu_queue_cmd(&cmd);
924 if (rc)
925 return rc;
926 wait_for_completion(&comp);
927 if (cmd.status != 0)
928 return rc;
929 if (cmd.reply_len != clen) {
930 printk(KERN_DEBUG "SMU: short read in "
931 "smu_read_datablock, got: %d, want: %d\n",
932 cmd.reply_len, clen);
933 return -EIO;
935 len -= clen;
936 addr += clen;
937 dest += clen;
939 return 0;
942 static struct smu_sdbp_header *smu_create_sdb_partition(int id)
944 DECLARE_COMPLETION_ONSTACK(comp);
945 struct smu_simple_cmd cmd;
946 unsigned int addr, len, tlen;
947 struct smu_sdbp_header *hdr;
948 struct property *prop;
950 /* First query the partition info */
951 DPRINTK("SMU: Query partition infos ... (irq=%d)\n", smu->db_irq);
952 smu_queue_simple(&cmd, SMU_CMD_PARTITION_COMMAND, 2,
953 smu_done_complete, &comp,
954 SMU_CMD_PARTITION_LATEST, id);
955 wait_for_completion(&comp);
956 DPRINTK("SMU: done, status: %d, reply_len: %d\n",
957 cmd.cmd.status, cmd.cmd.reply_len);
959 /* Partition doesn't exist (or other error) */
960 if (cmd.cmd.status != 0 || cmd.cmd.reply_len != 6)
961 return NULL;
963 /* Fetch address and length from reply */
964 addr = *((u16 *)cmd.buffer);
965 len = cmd.buffer[3] << 2;
966 /* Calucluate total length to allocate, including the 17 bytes
967 * for "sdb-partition-XX" that we append at the end of the buffer
969 tlen = sizeof(struct property) + len + 18;
971 prop = kzalloc(tlen, GFP_KERNEL);
972 if (prop == NULL)
973 return NULL;
974 hdr = (struct smu_sdbp_header *)(prop + 1);
975 prop->name = ((char *)prop) + tlen - 18;
976 sprintf(prop->name, "sdb-partition-%02x", id);
977 prop->length = len;
978 prop->value = hdr;
979 prop->next = NULL;
981 /* Read the datablock */
982 if (smu_read_datablock((u8 *)hdr, addr, len)) {
983 printk(KERN_DEBUG "SMU: datablock read failed while reading "
984 "partition %02x !\n", id);
985 goto failure;
988 /* Got it, check a few things and create the property */
989 if (hdr->id != id) {
990 printk(KERN_DEBUG "SMU: Reading partition %02x and got "
991 "%02x !\n", id, hdr->id);
992 goto failure;
994 if (prom_add_property(smu->of_node, prop)) {
995 printk(KERN_DEBUG "SMU: Failed creating sdb-partition-%02x "
996 "property !\n", id);
997 goto failure;
1000 return hdr;
1001 failure:
1002 kfree(prop);
1003 return NULL;
1006 /* Note: Only allowed to return error code in pointers (using ERR_PTR)
1007 * when interruptible is 1
1009 const struct smu_sdbp_header *__smu_get_sdb_partition(int id,
1010 unsigned int *size, int interruptible)
1012 char pname[32];
1013 const struct smu_sdbp_header *part;
1015 if (!smu)
1016 return NULL;
1018 sprintf(pname, "sdb-partition-%02x", id);
1020 DPRINTK("smu_get_sdb_partition(%02x)\n", id);
1022 if (interruptible) {
1023 int rc;
1024 rc = mutex_lock_interruptible(&smu_part_access);
1025 if (rc)
1026 return ERR_PTR(rc);
1027 } else
1028 mutex_lock(&smu_part_access);
1030 part = of_get_property(smu->of_node, pname, size);
1031 if (part == NULL) {
1032 DPRINTK("trying to extract from SMU ...\n");
1033 part = smu_create_sdb_partition(id);
1034 if (part != NULL && size)
1035 *size = part->len << 2;
1037 mutex_unlock(&smu_part_access);
1038 return part;
1041 const struct smu_sdbp_header *smu_get_sdb_partition(int id, unsigned int *size)
1043 return __smu_get_sdb_partition(id, size, 0);
1045 EXPORT_SYMBOL(smu_get_sdb_partition);
1049 * Userland driver interface
1053 static LIST_HEAD(smu_clist);
1054 static DEFINE_SPINLOCK(smu_clist_lock);
1056 enum smu_file_mode {
1057 smu_file_commands,
1058 smu_file_events,
1059 smu_file_closing
1062 struct smu_private
1064 struct list_head list;
1065 enum smu_file_mode mode;
1066 int busy;
1067 struct smu_cmd cmd;
1068 spinlock_t lock;
1069 wait_queue_head_t wait;
1070 u8 buffer[SMU_MAX_DATA];
1074 static int smu_open(struct inode *inode, struct file *file)
1076 struct smu_private *pp;
1077 unsigned long flags;
1079 pp = kzalloc(sizeof(struct smu_private), GFP_KERNEL);
1080 if (pp == 0)
1081 return -ENOMEM;
1082 spin_lock_init(&pp->lock);
1083 pp->mode = smu_file_commands;
1084 init_waitqueue_head(&pp->wait);
1086 spin_lock_irqsave(&smu_clist_lock, flags);
1087 list_add(&pp->list, &smu_clist);
1088 spin_unlock_irqrestore(&smu_clist_lock, flags);
1089 file->private_data = pp;
1091 return 0;
1095 static void smu_user_cmd_done(struct smu_cmd *cmd, void *misc)
1097 struct smu_private *pp = misc;
1099 wake_up_all(&pp->wait);
1103 static ssize_t smu_write(struct file *file, const char __user *buf,
1104 size_t count, loff_t *ppos)
1106 struct smu_private *pp = file->private_data;
1107 unsigned long flags;
1108 struct smu_user_cmd_hdr hdr;
1109 int rc = 0;
1111 if (pp->busy)
1112 return -EBUSY;
1113 else if (copy_from_user(&hdr, buf, sizeof(hdr)))
1114 return -EFAULT;
1115 else if (hdr.cmdtype == SMU_CMDTYPE_WANTS_EVENTS) {
1116 pp->mode = smu_file_events;
1117 return 0;
1118 } else if (hdr.cmdtype == SMU_CMDTYPE_GET_PARTITION) {
1119 const struct smu_sdbp_header *part;
1120 part = __smu_get_sdb_partition(hdr.cmd, NULL, 1);
1121 if (part == NULL)
1122 return -EINVAL;
1123 else if (IS_ERR(part))
1124 return PTR_ERR(part);
1125 return 0;
1126 } else if (hdr.cmdtype != SMU_CMDTYPE_SMU)
1127 return -EINVAL;
1128 else if (pp->mode != smu_file_commands)
1129 return -EBADFD;
1130 else if (hdr.data_len > SMU_MAX_DATA)
1131 return -EINVAL;
1133 spin_lock_irqsave(&pp->lock, flags);
1134 if (pp->busy) {
1135 spin_unlock_irqrestore(&pp->lock, flags);
1136 return -EBUSY;
1138 pp->busy = 1;
1139 pp->cmd.status = 1;
1140 spin_unlock_irqrestore(&pp->lock, flags);
1142 if (copy_from_user(pp->buffer, buf + sizeof(hdr), hdr.data_len)) {
1143 pp->busy = 0;
1144 return -EFAULT;
1147 pp->cmd.cmd = hdr.cmd;
1148 pp->cmd.data_len = hdr.data_len;
1149 pp->cmd.reply_len = SMU_MAX_DATA;
1150 pp->cmd.data_buf = pp->buffer;
1151 pp->cmd.reply_buf = pp->buffer;
1152 pp->cmd.done = smu_user_cmd_done;
1153 pp->cmd.misc = pp;
1154 rc = smu_queue_cmd(&pp->cmd);
1155 if (rc < 0)
1156 return rc;
1157 return count;
1161 static ssize_t smu_read_command(struct file *file, struct smu_private *pp,
1162 char __user *buf, size_t count)
1164 DECLARE_WAITQUEUE(wait, current);
1165 struct smu_user_reply_hdr hdr;
1166 unsigned long flags;
1167 int size, rc = 0;
1169 if (!pp->busy)
1170 return 0;
1171 if (count < sizeof(struct smu_user_reply_hdr))
1172 return -EOVERFLOW;
1173 spin_lock_irqsave(&pp->lock, flags);
1174 if (pp->cmd.status == 1) {
1175 if (file->f_flags & O_NONBLOCK)
1176 return -EAGAIN;
1177 add_wait_queue(&pp->wait, &wait);
1178 for (;;) {
1179 set_current_state(TASK_INTERRUPTIBLE);
1180 rc = 0;
1181 if (pp->cmd.status != 1)
1182 break;
1183 rc = -ERESTARTSYS;
1184 if (signal_pending(current))
1185 break;
1186 spin_unlock_irqrestore(&pp->lock, flags);
1187 schedule();
1188 spin_lock_irqsave(&pp->lock, flags);
1190 set_current_state(TASK_RUNNING);
1191 remove_wait_queue(&pp->wait, &wait);
1193 spin_unlock_irqrestore(&pp->lock, flags);
1194 if (rc)
1195 return rc;
1196 if (pp->cmd.status != 0)
1197 pp->cmd.reply_len = 0;
1198 size = sizeof(hdr) + pp->cmd.reply_len;
1199 if (count < size)
1200 size = count;
1201 rc = size;
1202 hdr.status = pp->cmd.status;
1203 hdr.reply_len = pp->cmd.reply_len;
1204 if (copy_to_user(buf, &hdr, sizeof(hdr)))
1205 return -EFAULT;
1206 size -= sizeof(hdr);
1207 if (size && copy_to_user(buf + sizeof(hdr), pp->buffer, size))
1208 return -EFAULT;
1209 pp->busy = 0;
1211 return rc;
1215 static ssize_t smu_read_events(struct file *file, struct smu_private *pp,
1216 char __user *buf, size_t count)
1218 /* Not implemented */
1219 msleep_interruptible(1000);
1220 return 0;
1224 static ssize_t smu_read(struct file *file, char __user *buf,
1225 size_t count, loff_t *ppos)
1227 struct smu_private *pp = file->private_data;
1229 if (pp->mode == smu_file_commands)
1230 return smu_read_command(file, pp, buf, count);
1231 if (pp->mode == smu_file_events)
1232 return smu_read_events(file, pp, buf, count);
1234 return -EBADFD;
1237 static unsigned int smu_fpoll(struct file *file, poll_table *wait)
1239 struct smu_private *pp = file->private_data;
1240 unsigned int mask = 0;
1241 unsigned long flags;
1243 if (pp == 0)
1244 return 0;
1246 if (pp->mode == smu_file_commands) {
1247 poll_wait(file, &pp->wait, wait);
1249 spin_lock_irqsave(&pp->lock, flags);
1250 if (pp->busy && pp->cmd.status != 1)
1251 mask |= POLLIN;
1252 spin_unlock_irqrestore(&pp->lock, flags);
1253 } if (pp->mode == smu_file_events) {
1254 /* Not yet implemented */
1256 return mask;
1259 static int smu_release(struct inode *inode, struct file *file)
1261 struct smu_private *pp = file->private_data;
1262 unsigned long flags;
1263 unsigned int busy;
1265 if (pp == 0)
1266 return 0;
1268 file->private_data = NULL;
1270 /* Mark file as closing to avoid races with new request */
1271 spin_lock_irqsave(&pp->lock, flags);
1272 pp->mode = smu_file_closing;
1273 busy = pp->busy;
1275 /* Wait for any pending request to complete */
1276 if (busy && pp->cmd.status == 1) {
1277 DECLARE_WAITQUEUE(wait, current);
1279 add_wait_queue(&pp->wait, &wait);
1280 for (;;) {
1281 set_current_state(TASK_UNINTERRUPTIBLE);
1282 if (pp->cmd.status != 1)
1283 break;
1284 spin_unlock_irqrestore(&pp->lock, flags);
1285 schedule();
1286 spin_lock_irqsave(&pp->lock, flags);
1288 set_current_state(TASK_RUNNING);
1289 remove_wait_queue(&pp->wait, &wait);
1291 spin_unlock_irqrestore(&pp->lock, flags);
1293 spin_lock_irqsave(&smu_clist_lock, flags);
1294 list_del(&pp->list);
1295 spin_unlock_irqrestore(&smu_clist_lock, flags);
1296 kfree(pp);
1298 return 0;
1302 static const struct file_operations smu_device_fops = {
1303 .llseek = no_llseek,
1304 .read = smu_read,
1305 .write = smu_write,
1306 .poll = smu_fpoll,
1307 .open = smu_open,
1308 .release = smu_release,
1311 static struct miscdevice pmu_device = {
1312 MISC_DYNAMIC_MINOR, "smu", &smu_device_fops
1315 static int smu_device_init(void)
1317 if (!smu)
1318 return -ENODEV;
1319 if (misc_register(&pmu_device) < 0)
1320 printk(KERN_ERR "via-pmu: cannot register misc device.\n");
1321 return 0;
1323 device_initcall(smu_device_init);