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.
12 * - maybe add timeout to commands ?
13 * - blocking version of time functions
14 * - polling version of i2c commands (including timer that works with
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/poll.h>
36 #include <linux/mutex.h>
37 #include <linux/of_device.h>
38 #include <linux/of_platform.h>
39 #include <linux/slab.h>
41 #include <asm/byteorder.h>
44 #include <asm/machdep.h>
45 #include <asm/pmac_feature.h>
47 #include <asm/sections.h>
48 #include <asm/uaccess.h>
51 #define AUTHOR "(c) 2005 Benjamin Herrenschmidt, IBM Corp."
56 #define DPRINTK(fmt, args...) do { printk(KERN_DEBUG fmt , ##args); } while (0)
58 #define DPRINTK(fmt, args...) do { } while (0)
62 * This is the command buffer passed to the SMU hardware
64 #define SMU_MAX_DATA 254
69 u8 data
[SMU_MAX_DATA
];
74 struct device_node
*of_node
;
75 struct platform_device
*of_dev
;
76 int doorbell
; /* doorbell gpio */
77 u32 __iomem
*db_buf
; /* doorbell buffer */
78 struct device_node
*db_node
;
81 struct device_node
*msg_node
;
83 struct smu_cmd_buf
*cmd_buf
; /* command buffer virtual */
84 u32 cmd_buf_abs
; /* command buffer absolute */
85 struct list_head cmd_list
;
86 struct smu_cmd
*cmd_cur
; /* pending command */
88 struct list_head cmd_i2c_list
;
89 struct smu_i2c_cmd
*cmd_i2c_cur
; /* pending i2c command */
90 struct timer_list i2c_timer
;
94 * I don't think there will ever be more than one SMU, so
95 * for now, just hard code that
97 static DEFINE_MUTEX(smu_mutex
);
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
;
113 if (list_empty(&smu
->cmd_list
))
116 /* Fetch first command in queue */
117 cmd
= list_entry(smu
->cmd_list
.next
, struct smu_cmd
, link
);
119 list_del(&cmd
->link
);
121 DPRINTK("SMU: starting cmd %x, %d bytes data\n", cmd
->cmd
,
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.
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
)
167 void (*done
)(struct smu_cmd
*cmd
, void *misc
) = NULL
;
172 /* SMU completed the command, well, we hope, let's make sure
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
);
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);
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
);
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
229 /* Re-enable NAP mode */
233 /* Start next command if any */
235 spin_unlock_irqrestore(&smu
->lock
, flags
);
237 /* Call command completion handler if any */
241 /* It's an edge interrupt, nothing to do */
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 */
261 * Queued command management.
265 int smu_queue_cmd(struct smu_cmd
*cmd
)
271 if (cmd
->data_len
> SMU_MAX_DATA
||
272 cmd
->reply_len
> SMU_MAX_DATA
)
276 spin_lock_irqsave(&smu
->lock
, flags
);
277 list_add_tail(&cmd
->link
, &smu
->cmd_list
);
278 if (smu
->cmd_cur
== NULL
)
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
);
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
),
296 struct smu_cmd
*cmd
= &scmd
->cmd
;
300 if (data_len
> sizeof(scmd
->buffer
))
303 memset(scmd
, 0, sizeof(*scmd
));
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
;
312 va_start(list
, misc
);
313 for (i
= 0; i
< data_len
; ++i
)
314 scmd
->buffer
[i
] = (u8
)va_arg(list
, int);
317 return smu_queue_cmd(cmd
);
319 EXPORT_SYMBOL(smu_queue_simple
);
329 gpio
= pmac_do_feature_call(PMAC_FTR_READ_GPIO
, NULL
, smu
->doorbell
);
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
;
342 EXPORT_SYMBOL(smu_done_complete
);
345 void smu_spinwait_cmd(struct smu_cmd
*cmd
)
347 while(cmd
->status
== 1)
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
)
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
;
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
);
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;
409 int smu_set_rtc_time(struct rtc_time
*time
, int spinwait
)
411 struct smu_simple_cmd cmd
;
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
),
423 hex2bcd(time
->tm_mday
),
424 hex2bcd(time
->tm_mon
) + 1,
425 hex2bcd(time
->tm_year
- 100));
428 smu_spinwait_simple(&cmd
);
434 void smu_shutdown(void)
436 struct smu_simple_cmd cmd
;
441 if (smu_queue_simple(&cmd
, SMU_CMD_POWER_COMMAND
, 9, NULL
, NULL
,
442 'S', 'H', 'U', 'T', 'D', 'O', 'W', 'N', 0))
444 smu_spinwait_simple(&cmd
);
450 void smu_restart(void)
452 struct smu_simple_cmd cmd
;
457 if (smu_queue_simple(&cmd
, SMU_CMD_POWER_COMMAND
, 8, NULL
, NULL
,
458 'R', 'E', 'S', 'T', 'A', 'R', 'T', 0))
460 smu_spinwait_simple(&cmd
);
466 int smu_present(void)
470 EXPORT_SYMBOL(smu_present
);
473 int __init
smu_init (void)
475 struct device_node
*np
;
479 np
= of_find_node_by_type(NULL
, "smu");
483 printk(KERN_INFO
"SMU: Driver %s %s\n", VERSION
, AUTHOR
);
485 if (smu_cmdbuf_abs
== 0) {
486 printk(KERN_ERR
"SMU: Command buffer not allocated !\n");
491 smu
= alloc_bootmem(sizeof(struct smu_device
));
493 spin_lock_init(&smu
->lock
);
494 INIT_LIST_HEAD(&smu
->cmd_list
);
495 INIT_LIST_HEAD(&smu
->cmd_i2c_list
);
497 smu
->db_irq
= NO_IRQ
;
498 smu
->msg_irq
= NO_IRQ
;
500 /* smu_cmdbuf_abs is in the low 2G of RAM, can be converted to a
501 * 32 bits value safely
503 smu
->cmd_buf_abs
= (u32
)smu_cmdbuf_abs
;
504 smu
->cmd_buf
= __va(smu_cmdbuf_abs
);
506 smu
->db_node
= of_find_node_by_name(NULL
, "smu-doorbell");
507 if (smu
->db_node
== NULL
) {
508 printk(KERN_ERR
"SMU: Can't find doorbell GPIO !\n");
512 data
= of_get_property(smu
->db_node
, "reg", NULL
);
514 printk(KERN_ERR
"SMU: Can't find doorbell GPIO address !\n");
519 /* Current setup has one doorbell GPIO that does both doorbell
520 * and ack. GPIOs are at 0x50, best would be to find that out
521 * in the device-tree though.
523 smu
->doorbell
= *data
;
524 if (smu
->doorbell
< 0x50)
525 smu
->doorbell
+= 0x50;
527 /* Now look for the smu-interrupt GPIO */
529 smu
->msg_node
= of_find_node_by_name(NULL
, "smu-interrupt");
530 if (smu
->msg_node
== NULL
)
532 data
= of_get_property(smu
->msg_node
, "reg", NULL
);
534 of_node_put(smu
->msg_node
);
535 smu
->msg_node
= NULL
;
543 /* Doorbell buffer is currently hard-coded, I didn't find a proper
544 * device-tree entry giving the address. Best would probably to use
545 * an offset for K2 base though, but let's do it that way for now.
547 smu
->db_buf
= ioremap(0x8000860c, 0x1000);
548 if (smu
->db_buf
== NULL
) {
549 printk(KERN_ERR
"SMU: Can't map doorbell buffer pointer !\n");
554 /* U3 has an issue with NAP mode when issuing SMU commands */
555 smu
->broken_nap
= pmac_get_uninorth_variant() < 4;
557 printk(KERN_INFO
"SMU: using NAP mode workaround\n");
559 sys_ctrler
= SYS_CTRLER_SMU
;
564 of_node_put(smu
->msg_node
);
566 of_node_put(smu
->db_node
);
568 free_bootmem((unsigned long)smu
, sizeof(struct smu_device
));
576 static int smu_late_init(void)
581 init_timer(&smu
->i2c_timer
);
582 smu
->i2c_timer
.function
= smu_i2c_retry
;
583 smu
->i2c_timer
.data
= (unsigned long)smu
;
586 smu
->db_irq
= irq_of_parse_and_map(smu
->db_node
, 0);
587 if (smu
->db_irq
== NO_IRQ
)
588 printk(KERN_ERR
"smu: failed to map irq for node %s\n",
589 smu
->db_node
->full_name
);
592 smu
->msg_irq
= irq_of_parse_and_map(smu
->msg_node
, 0);
593 if (smu
->msg_irq
== NO_IRQ
)
594 printk(KERN_ERR
"smu: failed to map irq for node %s\n",
595 smu
->msg_node
->full_name
);
599 * Try to request the interrupts
602 if (smu
->db_irq
!= NO_IRQ
) {
603 if (request_irq(smu
->db_irq
, smu_db_intr
,
604 IRQF_SHARED
, "SMU doorbell", smu
) < 0) {
605 printk(KERN_WARNING
"SMU: can't "
606 "request interrupt %d\n",
608 smu
->db_irq
= NO_IRQ
;
612 if (smu
->msg_irq
!= NO_IRQ
) {
613 if (request_irq(smu
->msg_irq
, smu_msg_intr
,
614 IRQF_SHARED
, "SMU message", smu
) < 0) {
615 printk(KERN_WARNING
"SMU: can't "
616 "request interrupt %d\n",
618 smu
->msg_irq
= NO_IRQ
;
625 /* This has to be before arch_initcall as the low i2c stuff relies on the
626 * above having been done before we reach arch_initcalls
628 core_initcall(smu_late_init
);
634 static void smu_expose_childs(struct work_struct
*unused
)
636 struct device_node
*np
;
638 for (np
= NULL
; (np
= of_get_next_child(smu
->of_node
, np
)) != NULL
;)
639 if (of_device_is_compatible(np
, "smu-sensors"))
640 of_platform_device_create(np
, "smu-sensors",
644 static DECLARE_WORK(smu_expose_childs_work
, smu_expose_childs
);
646 static int smu_platform_probe(struct platform_device
* dev
)
653 * Ok, we are matched, now expose all i2c busses. We have to defer
654 * that unfortunately or it would deadlock inside the device model
656 schedule_work(&smu_expose_childs_work
);
661 static const struct of_device_id smu_platform_match
[] =
669 static struct platform_driver smu_of_platform_driver
=
673 .owner
= THIS_MODULE
,
674 .of_match_table
= smu_platform_match
,
676 .probe
= smu_platform_probe
,
679 static int __init
smu_init_sysfs(void)
682 * For now, we don't power manage machines with an SMU chip,
683 * I'm a bit too far from figuring out how that works with those
684 * new chipsets, but that will come back and bite us
686 platform_driver_register(&smu_of_platform_driver
);
690 device_initcall(smu_init_sysfs
);
692 struct platform_device
*smu_get_ofdev(void)
699 EXPORT_SYMBOL_GPL(smu_get_ofdev
);
705 static void smu_i2c_complete_command(struct smu_i2c_cmd
*cmd
, int fail
)
707 void (*done
)(struct smu_i2c_cmd
*cmd
, void *misc
) = cmd
->done
;
708 void *misc
= cmd
->misc
;
711 /* Check for read case */
712 if (!fail
&& cmd
->read
) {
713 if (cmd
->pdata
[0] < 1)
716 memcpy(cmd
->info
.data
, &cmd
->pdata
[1],
720 DPRINTK("SMU: completing, success: %d\n", !fail
);
722 /* Update status and mark no pending i2c command with lock
723 * held so nobody comes in while we dequeue an eventual
724 * pending next i2c command
726 spin_lock_irqsave(&smu
->lock
, flags
);
727 smu
->cmd_i2c_cur
= NULL
;
729 cmd
->status
= fail
? -EIO
: 0;
731 /* Is there another i2c command waiting ? */
732 if (!list_empty(&smu
->cmd_i2c_list
)) {
733 struct smu_i2c_cmd
*newcmd
;
735 /* Fetch it, new current, remove from list */
736 newcmd
= list_entry(smu
->cmd_i2c_list
.next
,
737 struct smu_i2c_cmd
, link
);
738 smu
->cmd_i2c_cur
= newcmd
;
739 list_del(&cmd
->link
);
741 /* Queue with low level smu */
742 list_add_tail(&cmd
->scmd
.link
, &smu
->cmd_list
);
743 if (smu
->cmd_cur
== NULL
)
746 spin_unlock_irqrestore(&smu
->lock
, flags
);
748 /* Call command completion handler if any */
755 static void smu_i2c_retry(unsigned long data
)
757 struct smu_i2c_cmd
*cmd
= smu
->cmd_i2c_cur
;
759 DPRINTK("SMU: i2c failure, requeuing...\n");
761 /* requeue command simply by resetting reply_len */
762 cmd
->pdata
[0] = 0xff;
763 cmd
->scmd
.reply_len
= sizeof(cmd
->pdata
);
764 smu_queue_cmd(&cmd
->scmd
);
768 static void smu_i2c_low_completion(struct smu_cmd
*scmd
, void *misc
)
770 struct smu_i2c_cmd
*cmd
= misc
;
773 DPRINTK("SMU: i2c compl. stage=%d status=%x pdata[0]=%x rlen: %x\n",
774 cmd
->stage
, scmd
->status
, cmd
->pdata
[0], scmd
->reply_len
);
776 /* Check for possible status */
777 if (scmd
->status
< 0)
779 else if (cmd
->read
) {
781 fail
= cmd
->pdata
[0] != 0;
783 fail
= cmd
->pdata
[0] >= 0x80;
785 fail
= cmd
->pdata
[0] != 0;
788 /* Handle failures by requeuing command, after 5ms interval
790 if (fail
&& --cmd
->retries
> 0) {
791 DPRINTK("SMU: i2c failure, starting timer...\n");
792 BUG_ON(cmd
!= smu
->cmd_i2c_cur
);
793 if (!smu_irq_inited
) {
798 mod_timer(&smu
->i2c_timer
, jiffies
+ msecs_to_jiffies(5));
802 /* If failure or stage 1, command is complete */
803 if (fail
|| cmd
->stage
!= 0) {
804 smu_i2c_complete_command(cmd
, fail
);
808 DPRINTK("SMU: going to stage 1\n");
810 /* Ok, initial command complete, now poll status */
811 scmd
->reply_buf
= cmd
->pdata
;
812 scmd
->reply_len
= sizeof(cmd
->pdata
);
813 scmd
->data_buf
= cmd
->pdata
;
822 int smu_queue_i2c(struct smu_i2c_cmd
*cmd
)
829 /* Fill most fields of scmd */
830 cmd
->scmd
.cmd
= SMU_CMD_I2C_COMMAND
;
831 cmd
->scmd
.done
= smu_i2c_low_completion
;
832 cmd
->scmd
.misc
= cmd
;
833 cmd
->scmd
.reply_buf
= cmd
->pdata
;
834 cmd
->scmd
.reply_len
= sizeof(cmd
->pdata
);
835 cmd
->scmd
.data_buf
= (u8
*)(char *)&cmd
->info
;
836 cmd
->scmd
.status
= 1;
838 cmd
->pdata
[0] = 0xff;
842 /* Check transfer type, sanitize some "info" fields
843 * based on transfer type and do more checking
845 cmd
->info
.caddr
= cmd
->info
.devaddr
;
846 cmd
->read
= cmd
->info
.devaddr
& 0x01;
847 switch(cmd
->info
.type
) {
848 case SMU_I2C_TRANSFER_SIMPLE
:
849 memset(&cmd
->info
.sublen
, 0, 4);
851 case SMU_I2C_TRANSFER_COMBINED
:
852 cmd
->info
.devaddr
&= 0xfe;
853 case SMU_I2C_TRANSFER_STDSUB
:
854 if (cmd
->info
.sublen
> 3)
861 /* Finish setting up command based on transfer direction
864 if (cmd
->info
.datalen
> SMU_I2C_READ_MAX
)
866 memset(cmd
->info
.data
, 0xff, cmd
->info
.datalen
);
867 cmd
->scmd
.data_len
= 9;
869 if (cmd
->info
.datalen
> SMU_I2C_WRITE_MAX
)
871 cmd
->scmd
.data_len
= 9 + cmd
->info
.datalen
;
874 DPRINTK("SMU: i2c enqueuing command\n");
875 DPRINTK("SMU: %s, len=%d bus=%x addr=%x sub0=%x type=%x\n",
876 cmd
->read
? "read" : "write", cmd
->info
.datalen
,
877 cmd
->info
.bus
, cmd
->info
.caddr
,
878 cmd
->info
.subaddr
[0], cmd
->info
.type
);
881 /* Enqueue command in i2c list, and if empty, enqueue also in
884 spin_lock_irqsave(&smu
->lock
, flags
);
885 if (smu
->cmd_i2c_cur
== NULL
) {
886 smu
->cmd_i2c_cur
= cmd
;
887 list_add_tail(&cmd
->scmd
.link
, &smu
->cmd_list
);
888 if (smu
->cmd_cur
== NULL
)
891 list_add_tail(&cmd
->link
, &smu
->cmd_i2c_list
);
892 spin_unlock_irqrestore(&smu
->lock
, flags
);
898 * Handling of "partitions"
901 static int smu_read_datablock(u8
*dest
, unsigned int addr
, unsigned int len
)
903 DECLARE_COMPLETION_ONSTACK(comp
);
909 /* We currently use a chunk size of 0xe. We could check the
910 * SMU firmware version and use bigger sizes though
915 unsigned int clen
= min(len
, chunk
);
917 cmd
.cmd
= SMU_CMD_MISC_ee_COMMAND
;
919 cmd
.data_buf
= params
;
920 cmd
.reply_len
= chunk
;
921 cmd
.reply_buf
= dest
;
922 cmd
.done
= smu_done_complete
;
924 params
[0] = SMU_CMD_MISC_ee_GET_DATABLOCK_REC
;
926 *((u32
*)¶ms
[2]) = addr
;
929 rc
= smu_queue_cmd(&cmd
);
932 wait_for_completion(&comp
);
935 if (cmd
.reply_len
!= clen
) {
936 printk(KERN_DEBUG
"SMU: short read in "
937 "smu_read_datablock, got: %d, want: %d\n",
938 cmd
.reply_len
, clen
);
948 static struct smu_sdbp_header
*smu_create_sdb_partition(int id
)
950 DECLARE_COMPLETION_ONSTACK(comp
);
951 struct smu_simple_cmd cmd
;
952 unsigned int addr
, len
, tlen
;
953 struct smu_sdbp_header
*hdr
;
954 struct property
*prop
;
956 /* First query the partition info */
957 DPRINTK("SMU: Query partition infos ... (irq=%d)\n", smu
->db_irq
);
958 smu_queue_simple(&cmd
, SMU_CMD_PARTITION_COMMAND
, 2,
959 smu_done_complete
, &comp
,
960 SMU_CMD_PARTITION_LATEST
, id
);
961 wait_for_completion(&comp
);
962 DPRINTK("SMU: done, status: %d, reply_len: %d\n",
963 cmd
.cmd
.status
, cmd
.cmd
.reply_len
);
965 /* Partition doesn't exist (or other error) */
966 if (cmd
.cmd
.status
!= 0 || cmd
.cmd
.reply_len
!= 6)
969 /* Fetch address and length from reply */
970 addr
= *((u16
*)cmd
.buffer
);
971 len
= cmd
.buffer
[3] << 2;
972 /* Calucluate total length to allocate, including the 17 bytes
973 * for "sdb-partition-XX" that we append at the end of the buffer
975 tlen
= sizeof(struct property
) + len
+ 18;
977 prop
= kzalloc(tlen
, GFP_KERNEL
);
980 hdr
= (struct smu_sdbp_header
*)(prop
+ 1);
981 prop
->name
= ((char *)prop
) + tlen
- 18;
982 sprintf(prop
->name
, "sdb-partition-%02x", id
);
987 /* Read the datablock */
988 if (smu_read_datablock((u8
*)hdr
, addr
, len
)) {
989 printk(KERN_DEBUG
"SMU: datablock read failed while reading "
990 "partition %02x !\n", id
);
994 /* Got it, check a few things and create the property */
996 printk(KERN_DEBUG
"SMU: Reading partition %02x and got "
997 "%02x !\n", id
, hdr
->id
);
1000 if (prom_add_property(smu
->of_node
, prop
)) {
1001 printk(KERN_DEBUG
"SMU: Failed creating sdb-partition-%02x "
1002 "property !\n", id
);
1012 /* Note: Only allowed to return error code in pointers (using ERR_PTR)
1013 * when interruptible is 1
1015 const struct smu_sdbp_header
*__smu_get_sdb_partition(int id
,
1016 unsigned int *size
, int interruptible
)
1019 const struct smu_sdbp_header
*part
;
1024 sprintf(pname
, "sdb-partition-%02x", id
);
1026 DPRINTK("smu_get_sdb_partition(%02x)\n", id
);
1028 if (interruptible
) {
1030 rc
= mutex_lock_interruptible(&smu_part_access
);
1034 mutex_lock(&smu_part_access
);
1036 part
= of_get_property(smu
->of_node
, pname
, size
);
1038 DPRINTK("trying to extract from SMU ...\n");
1039 part
= smu_create_sdb_partition(id
);
1040 if (part
!= NULL
&& size
)
1041 *size
= part
->len
<< 2;
1043 mutex_unlock(&smu_part_access
);
1047 const struct smu_sdbp_header
*smu_get_sdb_partition(int id
, unsigned int *size
)
1049 return __smu_get_sdb_partition(id
, size
, 0);
1051 EXPORT_SYMBOL(smu_get_sdb_partition
);
1055 * Userland driver interface
1059 static LIST_HEAD(smu_clist
);
1060 static DEFINE_SPINLOCK(smu_clist_lock
);
1062 enum smu_file_mode
{
1070 struct list_head list
;
1071 enum smu_file_mode mode
;
1075 wait_queue_head_t wait
;
1076 u8 buffer
[SMU_MAX_DATA
];
1080 static int smu_open(struct inode
*inode
, struct file
*file
)
1082 struct smu_private
*pp
;
1083 unsigned long flags
;
1085 pp
= kzalloc(sizeof(struct smu_private
), GFP_KERNEL
);
1088 spin_lock_init(&pp
->lock
);
1089 pp
->mode
= smu_file_commands
;
1090 init_waitqueue_head(&pp
->wait
);
1092 mutex_lock(&smu_mutex
);
1093 spin_lock_irqsave(&smu_clist_lock
, flags
);
1094 list_add(&pp
->list
, &smu_clist
);
1095 spin_unlock_irqrestore(&smu_clist_lock
, flags
);
1096 file
->private_data
= pp
;
1097 mutex_unlock(&smu_mutex
);
1103 static void smu_user_cmd_done(struct smu_cmd
*cmd
, void *misc
)
1105 struct smu_private
*pp
= misc
;
1107 wake_up_all(&pp
->wait
);
1111 static ssize_t
smu_write(struct file
*file
, const char __user
*buf
,
1112 size_t count
, loff_t
*ppos
)
1114 struct smu_private
*pp
= file
->private_data
;
1115 unsigned long flags
;
1116 struct smu_user_cmd_hdr hdr
;
1121 else if (copy_from_user(&hdr
, buf
, sizeof(hdr
)))
1123 else if (hdr
.cmdtype
== SMU_CMDTYPE_WANTS_EVENTS
) {
1124 pp
->mode
= smu_file_events
;
1126 } else if (hdr
.cmdtype
== SMU_CMDTYPE_GET_PARTITION
) {
1127 const struct smu_sdbp_header
*part
;
1128 part
= __smu_get_sdb_partition(hdr
.cmd
, NULL
, 1);
1131 else if (IS_ERR(part
))
1132 return PTR_ERR(part
);
1134 } else if (hdr
.cmdtype
!= SMU_CMDTYPE_SMU
)
1136 else if (pp
->mode
!= smu_file_commands
)
1138 else if (hdr
.data_len
> SMU_MAX_DATA
)
1141 spin_lock_irqsave(&pp
->lock
, flags
);
1143 spin_unlock_irqrestore(&pp
->lock
, flags
);
1148 spin_unlock_irqrestore(&pp
->lock
, flags
);
1150 if (copy_from_user(pp
->buffer
, buf
+ sizeof(hdr
), hdr
.data_len
)) {
1155 pp
->cmd
.cmd
= hdr
.cmd
;
1156 pp
->cmd
.data_len
= hdr
.data_len
;
1157 pp
->cmd
.reply_len
= SMU_MAX_DATA
;
1158 pp
->cmd
.data_buf
= pp
->buffer
;
1159 pp
->cmd
.reply_buf
= pp
->buffer
;
1160 pp
->cmd
.done
= smu_user_cmd_done
;
1162 rc
= smu_queue_cmd(&pp
->cmd
);
1169 static ssize_t
smu_read_command(struct file
*file
, struct smu_private
*pp
,
1170 char __user
*buf
, size_t count
)
1172 DECLARE_WAITQUEUE(wait
, current
);
1173 struct smu_user_reply_hdr hdr
;
1174 unsigned long flags
;
1179 if (count
< sizeof(struct smu_user_reply_hdr
))
1181 spin_lock_irqsave(&pp
->lock
, flags
);
1182 if (pp
->cmd
.status
== 1) {
1183 if (file
->f_flags
& O_NONBLOCK
) {
1184 spin_unlock_irqrestore(&pp
->lock
, flags
);
1187 add_wait_queue(&pp
->wait
, &wait
);
1189 set_current_state(TASK_INTERRUPTIBLE
);
1191 if (pp
->cmd
.status
!= 1)
1194 if (signal_pending(current
))
1196 spin_unlock_irqrestore(&pp
->lock
, flags
);
1198 spin_lock_irqsave(&pp
->lock
, flags
);
1200 set_current_state(TASK_RUNNING
);
1201 remove_wait_queue(&pp
->wait
, &wait
);
1203 spin_unlock_irqrestore(&pp
->lock
, flags
);
1206 if (pp
->cmd
.status
!= 0)
1207 pp
->cmd
.reply_len
= 0;
1208 size
= sizeof(hdr
) + pp
->cmd
.reply_len
;
1212 hdr
.status
= pp
->cmd
.status
;
1213 hdr
.reply_len
= pp
->cmd
.reply_len
;
1214 if (copy_to_user(buf
, &hdr
, sizeof(hdr
)))
1216 size
-= sizeof(hdr
);
1217 if (size
&& copy_to_user(buf
+ sizeof(hdr
), pp
->buffer
, size
))
1225 static ssize_t
smu_read_events(struct file
*file
, struct smu_private
*pp
,
1226 char __user
*buf
, size_t count
)
1228 /* Not implemented */
1229 msleep_interruptible(1000);
1234 static ssize_t
smu_read(struct file
*file
, char __user
*buf
,
1235 size_t count
, loff_t
*ppos
)
1237 struct smu_private
*pp
= file
->private_data
;
1239 if (pp
->mode
== smu_file_commands
)
1240 return smu_read_command(file
, pp
, buf
, count
);
1241 if (pp
->mode
== smu_file_events
)
1242 return smu_read_events(file
, pp
, buf
, count
);
1247 static unsigned int smu_fpoll(struct file
*file
, poll_table
*wait
)
1249 struct smu_private
*pp
= file
->private_data
;
1250 unsigned int mask
= 0;
1251 unsigned long flags
;
1256 if (pp
->mode
== smu_file_commands
) {
1257 poll_wait(file
, &pp
->wait
, wait
);
1259 spin_lock_irqsave(&pp
->lock
, flags
);
1260 if (pp
->busy
&& pp
->cmd
.status
!= 1)
1262 spin_unlock_irqrestore(&pp
->lock
, flags
);
1263 } if (pp
->mode
== smu_file_events
) {
1264 /* Not yet implemented */
1269 static int smu_release(struct inode
*inode
, struct file
*file
)
1271 struct smu_private
*pp
= file
->private_data
;
1272 unsigned long flags
;
1278 file
->private_data
= NULL
;
1280 /* Mark file as closing to avoid races with new request */
1281 spin_lock_irqsave(&pp
->lock
, flags
);
1282 pp
->mode
= smu_file_closing
;
1285 /* Wait for any pending request to complete */
1286 if (busy
&& pp
->cmd
.status
== 1) {
1287 DECLARE_WAITQUEUE(wait
, current
);
1289 add_wait_queue(&pp
->wait
, &wait
);
1291 set_current_state(TASK_UNINTERRUPTIBLE
);
1292 if (pp
->cmd
.status
!= 1)
1294 spin_unlock_irqrestore(&pp
->lock
, flags
);
1296 spin_lock_irqsave(&pp
->lock
, flags
);
1298 set_current_state(TASK_RUNNING
);
1299 remove_wait_queue(&pp
->wait
, &wait
);
1301 spin_unlock_irqrestore(&pp
->lock
, flags
);
1303 spin_lock_irqsave(&smu_clist_lock
, flags
);
1304 list_del(&pp
->list
);
1305 spin_unlock_irqrestore(&smu_clist_lock
, flags
);
1312 static const struct file_operations smu_device_fops
= {
1313 .llseek
= no_llseek
,
1318 .release
= smu_release
,
1321 static struct miscdevice pmu_device
= {
1322 MISC_DYNAMIC_MINOR
, "smu", &smu_device_fops
1325 static int smu_device_init(void)
1329 if (misc_register(&pmu_device
) < 0)
1330 printk(KERN_ERR
"via-pmu: cannot register misc device.\n");
1333 device_initcall(smu_device_init
);