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/config.h>
23 #include <linux/types.h>
24 #include <linux/kernel.h>
25 #include <linux/device.h>
26 #include <linux/dmapool.h>
27 #include <linux/bootmem.h>
28 #include <linux/vmalloc.h>
29 #include <linux/highmem.h>
30 #include <linux/jiffies.h>
31 #include <linux/interrupt.h>
32 #include <linux/rtc.h>
33 #include <linux/completion.h>
34 #include <linux/miscdevice.h>
35 #include <linux/delay.h>
36 #include <linux/sysdev.h>
37 #include <linux/poll.h>
39 #include <asm/byteorder.h>
42 #include <asm/machdep.h>
43 #include <asm/pmac_feature.h>
45 #include <asm/sections.h>
46 #include <asm/abs_addr.h>
47 #include <asm/uaccess.h>
48 #include <asm/of_device.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 of_device
*of_dev
;
76 int doorbell
; /* doorbell gpio */
77 u32 __iomem
*db_buf
; /* doorbell buffer */
81 struct smu_cmd_buf
*cmd_buf
; /* command buffer virtual */
82 u32 cmd_buf_abs
; /* command buffer absolute */
83 struct list_head cmd_list
;
84 struct smu_cmd
*cmd_cur
; /* pending command */
85 struct list_head cmd_i2c_list
;
86 struct smu_i2c_cmd
*cmd_i2c_cur
; /* pending i2c command */
87 struct timer_list i2c_timer
;
91 * I don't think there will ever be more than one SMU, so
92 * for now, just hard code that
94 static struct smu_device
*smu
;
98 * SMU driver low level stuff
101 static void smu_start_cmd(void)
103 unsigned long faddr
, fend
;
106 if (list_empty(&smu
->cmd_list
))
109 /* Fetch first command in queue */
110 cmd
= list_entry(smu
->cmd_list
.next
, struct smu_cmd
, link
);
112 list_del(&cmd
->link
);
114 DPRINTK("SMU: starting cmd %x, %d bytes data\n", cmd
->cmd
,
116 DPRINTK("SMU: data buffer: %02x %02x %02x %02x ...\n",
117 ((u8
*)cmd
->data_buf
)[0], ((u8
*)cmd
->data_buf
)[1],
118 ((u8
*)cmd
->data_buf
)[2], ((u8
*)cmd
->data_buf
)[3]);
120 /* Fill the SMU command buffer */
121 smu
->cmd_buf
->cmd
= cmd
->cmd
;
122 smu
->cmd_buf
->length
= cmd
->data_len
;
123 memcpy(smu
->cmd_buf
->data
, cmd
->data_buf
, cmd
->data_len
);
125 /* Flush command and data to RAM */
126 faddr
= (unsigned long)smu
->cmd_buf
;
127 fend
= faddr
+ smu
->cmd_buf
->length
+ 2;
128 flush_inval_dcache_range(faddr
, fend
);
130 /* This isn't exactly a DMA mapping here, I suspect
131 * the SMU is actually communicating with us via i2c to the
132 * northbridge or the CPU to access RAM.
134 writel(smu
->cmd_buf_abs
, smu
->db_buf
);
136 /* Ring the SMU doorbell */
137 pmac_do_feature_call(PMAC_FTR_WRITE_GPIO
, NULL
, smu
->doorbell
, 4);
141 static irqreturn_t
smu_db_intr(int irq
, void *arg
, struct pt_regs
*regs
)
145 void (*done
)(struct smu_cmd
*cmd
, void *misc
) = NULL
;
150 /* SMU completed the command, well, we hope, let's make sure
153 spin_lock_irqsave(&smu
->lock
, flags
);
155 gpio
= pmac_do_feature_call(PMAC_FTR_READ_GPIO
, NULL
, smu
->doorbell
);
169 /* CPU might have brought back the cache line, so we need
170 * to flush again before peeking at the SMU response. We
171 * flush the entire buffer for now as we haven't read the
172 * reply lenght (it's only 2 cache lines anyway)
174 faddr
= (unsigned long)smu
->cmd_buf
;
175 flush_inval_dcache_range(faddr
, faddr
+ 256);
178 ack
= (~cmd
->cmd
) & 0xff;
179 if (ack
!= smu
->cmd_buf
->cmd
) {
180 DPRINTK("SMU: incorrect ack, want %x got %x\n",
181 ack
, smu
->cmd_buf
->cmd
);
184 reply_len
= rc
== 0 ? smu
->cmd_buf
->length
: 0;
185 DPRINTK("SMU: reply len: %d\n", reply_len
);
186 if (reply_len
> cmd
->reply_len
) {
187 printk(KERN_WARNING
"SMU: reply buffer too small,"
188 "got %d bytes for a %d bytes buffer\n",
189 reply_len
, cmd
->reply_len
);
190 reply_len
= cmd
->reply_len
;
192 cmd
->reply_len
= reply_len
;
193 if (cmd
->reply_buf
&& reply_len
)
194 memcpy(cmd
->reply_buf
, smu
->cmd_buf
->data
, reply_len
);
197 /* Now complete the command. Write status last in order as we lost
198 * ownership of the command structure as soon as it's no longer -1
205 /* Start next command if any */
207 spin_unlock_irqrestore(&smu
->lock
, flags
);
209 /* Call command completion handler if any */
213 /* It's an edge interrupt, nothing to do */
218 static irqreturn_t
smu_msg_intr(int irq
, void *arg
, struct pt_regs
*regs
)
220 /* I don't quite know what to do with this one, we seem to never
221 * receive it, so I suspect we have to arm it someway in the SMU
222 * to start getting events that way.
225 printk(KERN_INFO
"SMU: message interrupt !\n");
227 /* It's an edge interrupt, nothing to do */
233 * Queued command management.
237 int smu_queue_cmd(struct smu_cmd
*cmd
)
243 if (cmd
->data_len
> SMU_MAX_DATA
||
244 cmd
->reply_len
> SMU_MAX_DATA
)
248 spin_lock_irqsave(&smu
->lock
, flags
);
249 list_add_tail(&cmd
->link
, &smu
->cmd_list
);
250 if (smu
->cmd_cur
== NULL
)
252 spin_unlock_irqrestore(&smu
->lock
, flags
);
256 EXPORT_SYMBOL(smu_queue_cmd
);
259 int smu_queue_simple(struct smu_simple_cmd
*scmd
, u8 command
,
260 unsigned int data_len
,
261 void (*done
)(struct smu_cmd
*cmd
, void *misc
),
264 struct smu_cmd
*cmd
= &scmd
->cmd
;
268 if (data_len
> sizeof(scmd
->buffer
))
271 memset(scmd
, 0, sizeof(*scmd
));
273 cmd
->data_len
= data_len
;
274 cmd
->data_buf
= scmd
->buffer
;
275 cmd
->reply_len
= sizeof(scmd
->buffer
);
276 cmd
->reply_buf
= scmd
->buffer
;
280 va_start(list
, misc
);
281 for (i
= 0; i
< data_len
; ++i
)
282 scmd
->buffer
[i
] = (u8
)va_arg(list
, int);
285 return smu_queue_cmd(cmd
);
287 EXPORT_SYMBOL(smu_queue_simple
);
297 gpio
= pmac_do_feature_call(PMAC_FTR_READ_GPIO
, NULL
, smu
->doorbell
);
299 smu_db_intr(smu
->db_irq
, smu
, NULL
);
301 EXPORT_SYMBOL(smu_poll
);
304 void smu_done_complete(struct smu_cmd
*cmd
, void *misc
)
306 struct completion
*comp
= misc
;
310 EXPORT_SYMBOL(smu_done_complete
);
313 void smu_spinwait_cmd(struct smu_cmd
*cmd
)
315 while(cmd
->status
== 1)
318 EXPORT_SYMBOL(smu_spinwait_cmd
);
321 /* RTC low level commands */
322 static inline int bcd2hex (int n
)
324 return (((n
& 0xf0) >> 4) * 10) + (n
& 0xf);
328 static inline int hex2bcd (int n
)
330 return ((n
/ 10) << 4) + (n
% 10);
334 static inline void smu_fill_set_rtc_cmd(struct smu_cmd_buf
*cmd_buf
,
335 struct rtc_time
*time
)
339 cmd_buf
->data
[0] = 0x80;
340 cmd_buf
->data
[1] = hex2bcd(time
->tm_sec
);
341 cmd_buf
->data
[2] = hex2bcd(time
->tm_min
);
342 cmd_buf
->data
[3] = hex2bcd(time
->tm_hour
);
343 cmd_buf
->data
[4] = time
->tm_wday
;
344 cmd_buf
->data
[5] = hex2bcd(time
->tm_mday
);
345 cmd_buf
->data
[6] = hex2bcd(time
->tm_mon
) + 1;
346 cmd_buf
->data
[7] = hex2bcd(time
->tm_year
- 100);
350 int smu_get_rtc_time(struct rtc_time
*time
, int spinwait
)
352 struct smu_simple_cmd cmd
;
358 memset(time
, 0, sizeof(struct rtc_time
));
359 rc
= smu_queue_simple(&cmd
, SMU_CMD_RTC_COMMAND
, 1, NULL
, NULL
,
360 SMU_CMD_RTC_GET_DATETIME
);
363 smu_spinwait_simple(&cmd
);
365 time
->tm_sec
= bcd2hex(cmd
.buffer
[0]);
366 time
->tm_min
= bcd2hex(cmd
.buffer
[1]);
367 time
->tm_hour
= bcd2hex(cmd
.buffer
[2]);
368 time
->tm_wday
= bcd2hex(cmd
.buffer
[3]);
369 time
->tm_mday
= bcd2hex(cmd
.buffer
[4]);
370 time
->tm_mon
= bcd2hex(cmd
.buffer
[5]) - 1;
371 time
->tm_year
= bcd2hex(cmd
.buffer
[6]) + 100;
377 int smu_set_rtc_time(struct rtc_time
*time
, int spinwait
)
379 struct smu_simple_cmd cmd
;
385 rc
= smu_queue_simple(&cmd
, SMU_CMD_RTC_COMMAND
, 8, NULL
, NULL
,
386 SMU_CMD_RTC_SET_DATETIME
,
387 hex2bcd(time
->tm_sec
),
388 hex2bcd(time
->tm_min
),
389 hex2bcd(time
->tm_hour
),
391 hex2bcd(time
->tm_mday
),
392 hex2bcd(time
->tm_mon
) + 1,
393 hex2bcd(time
->tm_year
- 100));
396 smu_spinwait_simple(&cmd
);
402 void smu_shutdown(void)
404 struct smu_simple_cmd cmd
;
409 if (smu_queue_simple(&cmd
, SMU_CMD_POWER_COMMAND
, 9, NULL
, NULL
,
410 'S', 'H', 'U', 'T', 'D', 'O', 'W', 'N', 0))
412 smu_spinwait_simple(&cmd
);
418 void smu_restart(void)
420 struct smu_simple_cmd cmd
;
425 if (smu_queue_simple(&cmd
, SMU_CMD_POWER_COMMAND
, 8, NULL
, NULL
,
426 'R', 'E', 'S', 'T', 'A', 'R', 'T', 0))
428 smu_spinwait_simple(&cmd
);
434 int smu_present(void)
438 EXPORT_SYMBOL(smu_present
);
443 struct device_node
*np
;
446 np
= of_find_node_by_type(NULL
, "smu");
450 printk(KERN_INFO
"SMU driver %s %s\n", VERSION
, AUTHOR
);
452 if (smu_cmdbuf_abs
== 0) {
453 printk(KERN_ERR
"SMU: Command buffer not allocated !\n");
457 smu
= alloc_bootmem(sizeof(struct smu_device
));
460 memset(smu
, 0, sizeof(*smu
));
462 spin_lock_init(&smu
->lock
);
463 INIT_LIST_HEAD(&smu
->cmd_list
);
464 INIT_LIST_HEAD(&smu
->cmd_i2c_list
);
466 smu
->db_irq
= NO_IRQ
;
467 smu
->msg_irq
= NO_IRQ
;
468 init_timer(&smu
->i2c_timer
);
470 /* smu_cmdbuf_abs is in the low 2G of RAM, can be converted to a
471 * 32 bits value safely
473 smu
->cmd_buf_abs
= (u32
)smu_cmdbuf_abs
;
474 smu
->cmd_buf
= (struct smu_cmd_buf
*)abs_to_virt(smu_cmdbuf_abs
);
476 np
= of_find_node_by_name(NULL
, "smu-doorbell");
478 printk(KERN_ERR
"SMU: Can't find doorbell GPIO !\n");
481 data
= (u32
*)get_property(np
, "reg", NULL
);
484 printk(KERN_ERR
"SMU: Can't find doorbell GPIO address !\n");
488 /* Current setup has one doorbell GPIO that does both doorbell
489 * and ack. GPIOs are at 0x50, best would be to find that out
490 * in the device-tree though.
492 smu
->doorbell
= *data
;
493 if (smu
->doorbell
< 0x50)
494 smu
->doorbell
+= 0x50;
496 smu
->db_irq
= np
->intrs
[0].line
;
500 /* Now look for the smu-interrupt GPIO */
502 np
= of_find_node_by_name(NULL
, "smu-interrupt");
505 data
= (u32
*)get_property(np
, "reg", NULL
);
514 smu
->msg_irq
= np
->intrs
[0].line
;
518 /* Doorbell buffer is currently hard-coded, I didn't find a proper
519 * device-tree entry giving the address. Best would probably to use
520 * an offset for K2 base though, but let's do it that way for now.
522 smu
->db_buf
= ioremap(0x8000860c, 0x1000);
523 if (smu
->db_buf
== NULL
) {
524 printk(KERN_ERR
"SMU: Can't map doorbell buffer pointer !\n");
528 sys_ctrler
= SYS_CTRLER_SMU
;
538 static int smu_late_init(void)
544 * Try to request the interrupts
547 if (smu
->db_irq
!= NO_IRQ
) {
548 if (request_irq(smu
->db_irq
, smu_db_intr
,
549 SA_SHIRQ
, "SMU doorbell", smu
) < 0) {
550 printk(KERN_WARNING
"SMU: can't "
551 "request interrupt %d\n",
553 smu
->db_irq
= NO_IRQ
;
557 if (smu
->msg_irq
!= NO_IRQ
) {
558 if (request_irq(smu
->msg_irq
, smu_msg_intr
,
559 SA_SHIRQ
, "SMU message", smu
) < 0) {
560 printk(KERN_WARNING
"SMU: can't "
561 "request interrupt %d\n",
563 smu
->msg_irq
= NO_IRQ
;
569 arch_initcall(smu_late_init
);
575 static void smu_expose_childs(void *unused
)
577 struct device_node
*np
;
579 for (np
= NULL
; (np
= of_get_next_child(smu
->of_node
, np
)) != NULL
;) {
580 if (device_is_compatible(np
, "smu-i2c")) {
582 u32
*reg
= (u32
*)get_property(np
, "reg", NULL
);
586 sprintf(name
, "smu-i2c-%02x", *reg
);
587 of_platform_device_create(np
, name
, &smu
->of_dev
->dev
);
593 static DECLARE_WORK(smu_expose_childs_work
, smu_expose_childs
, NULL
);
595 static int smu_platform_probe(struct of_device
* dev
,
596 const struct of_device_id
*match
)
603 * Ok, we are matched, now expose all i2c busses. We have to defer
604 * that unfortunately or it would deadlock inside the device model
606 schedule_work(&smu_expose_childs_work
);
611 static struct of_device_id smu_platform_match
[] =
619 static struct of_platform_driver smu_of_platform_driver
=
622 .match_table
= smu_platform_match
,
623 .probe
= smu_platform_probe
,
626 static int __init
smu_init_sysfs(void)
631 * Due to sysfs bogosity, a sysdev is not a real device, so
632 * we should in fact create both if we want sysdev semantics
633 * for power management.
634 * For now, we don't power manage machines with an SMU chip,
635 * I'm a bit too far from figuring out how that works with those
636 * new chipsets, but that will come back and bite us
638 rc
= of_register_driver(&smu_of_platform_driver
);
642 device_initcall(smu_init_sysfs
);
644 struct of_device
*smu_get_ofdev(void)
651 EXPORT_SYMBOL_GPL(smu_get_ofdev
);
657 static void smu_i2c_complete_command(struct smu_i2c_cmd
*cmd
, int fail
)
659 void (*done
)(struct smu_i2c_cmd
*cmd
, void *misc
) = cmd
->done
;
660 void *misc
= cmd
->misc
;
663 /* Check for read case */
664 if (!fail
&& cmd
->read
) {
665 if (cmd
->pdata
[0] < 1)
668 memcpy(cmd
->info
.data
, &cmd
->pdata
[1],
672 DPRINTK("SMU: completing, success: %d\n", !fail
);
674 /* Update status and mark no pending i2c command with lock
675 * held so nobody comes in while we dequeue an eventual
676 * pending next i2c command
678 spin_lock_irqsave(&smu
->lock
, flags
);
679 smu
->cmd_i2c_cur
= NULL
;
681 cmd
->status
= fail
? -EIO
: 0;
683 /* Is there another i2c command waiting ? */
684 if (!list_empty(&smu
->cmd_i2c_list
)) {
685 struct smu_i2c_cmd
*newcmd
;
687 /* Fetch it, new current, remove from list */
688 newcmd
= list_entry(smu
->cmd_i2c_list
.next
,
689 struct smu_i2c_cmd
, link
);
690 smu
->cmd_i2c_cur
= newcmd
;
691 list_del(&cmd
->link
);
693 /* Queue with low level smu */
694 list_add_tail(&cmd
->scmd
.link
, &smu
->cmd_list
);
695 if (smu
->cmd_cur
== NULL
)
698 spin_unlock_irqrestore(&smu
->lock
, flags
);
700 /* Call command completion handler if any */
707 static void smu_i2c_retry(unsigned long data
)
709 struct smu_i2c_cmd
*cmd
= (struct smu_i2c_cmd
*)data
;
711 DPRINTK("SMU: i2c failure, requeuing...\n");
713 /* requeue command simply by resetting reply_len */
714 cmd
->pdata
[0] = 0xff;
715 cmd
->scmd
.reply_len
= 0x10;
716 smu_queue_cmd(&cmd
->scmd
);
720 static void smu_i2c_low_completion(struct smu_cmd
*scmd
, void *misc
)
722 struct smu_i2c_cmd
*cmd
= misc
;
725 DPRINTK("SMU: i2c compl. stage=%d status=%x pdata[0]=%x rlen: %x\n",
726 cmd
->stage
, scmd
->status
, cmd
->pdata
[0], scmd
->reply_len
);
728 /* Check for possible status */
729 if (scmd
->status
< 0)
731 else if (cmd
->read
) {
733 fail
= cmd
->pdata
[0] != 0;
735 fail
= cmd
->pdata
[0] >= 0x80;
737 fail
= cmd
->pdata
[0] != 0;
740 /* Handle failures by requeuing command, after 5ms interval
742 if (fail
&& --cmd
->retries
> 0) {
743 DPRINTK("SMU: i2c failure, starting timer...\n");
744 smu
->i2c_timer
.function
= smu_i2c_retry
;
745 smu
->i2c_timer
.data
= (unsigned long)cmd
;
746 smu
->i2c_timer
.expires
= jiffies
+ msecs_to_jiffies(5);
747 add_timer(&smu
->i2c_timer
);
751 /* If failure or stage 1, command is complete */
752 if (fail
|| cmd
->stage
!= 0) {
753 smu_i2c_complete_command(cmd
, fail
);
757 DPRINTK("SMU: going to stage 1\n");
759 /* Ok, initial command complete, now poll status */
760 scmd
->reply_buf
= cmd
->pdata
;
761 scmd
->reply_len
= 0x10;
762 scmd
->data_buf
= cmd
->pdata
;
771 int smu_queue_i2c(struct smu_i2c_cmd
*cmd
)
778 /* Fill most fields of scmd */
779 cmd
->scmd
.cmd
= SMU_CMD_I2C_COMMAND
;
780 cmd
->scmd
.done
= smu_i2c_low_completion
;
781 cmd
->scmd
.misc
= cmd
;
782 cmd
->scmd
.reply_buf
= cmd
->pdata
;
783 cmd
->scmd
.reply_len
= 0x10;
784 cmd
->scmd
.data_buf
= (u8
*)(char *)&cmd
->info
;
785 cmd
->scmd
.status
= 1;
787 cmd
->pdata
[0] = 0xff;
791 /* Check transfer type, sanitize some "info" fields
792 * based on transfer type and do more checking
794 cmd
->info
.caddr
= cmd
->info
.devaddr
;
795 cmd
->read
= cmd
->info
.devaddr
& 0x01;
796 switch(cmd
->info
.type
) {
797 case SMU_I2C_TRANSFER_SIMPLE
:
798 memset(&cmd
->info
.sublen
, 0, 4);
800 case SMU_I2C_TRANSFER_COMBINED
:
801 cmd
->info
.devaddr
&= 0xfe;
802 case SMU_I2C_TRANSFER_STDSUB
:
803 if (cmd
->info
.sublen
> 3)
810 /* Finish setting up command based on transfer direction
813 if (cmd
->info
.datalen
> SMU_I2C_READ_MAX
)
815 memset(cmd
->info
.data
, 0xff, cmd
->info
.datalen
);
816 cmd
->scmd
.data_len
= 9;
818 if (cmd
->info
.datalen
> SMU_I2C_WRITE_MAX
)
820 cmd
->scmd
.data_len
= 9 + cmd
->info
.datalen
;
823 DPRINTK("SMU: i2c enqueuing command\n");
824 DPRINTK("SMU: %s, len=%d bus=%x addr=%x sub0=%x type=%x\n",
825 cmd
->read
? "read" : "write", cmd
->info
.datalen
,
826 cmd
->info
.bus
, cmd
->info
.caddr
,
827 cmd
->info
.subaddr
[0], cmd
->info
.type
);
830 /* Enqueue command in i2c list, and if empty, enqueue also in
833 spin_lock_irqsave(&smu
->lock
, flags
);
834 if (smu
->cmd_i2c_cur
== NULL
) {
835 smu
->cmd_i2c_cur
= cmd
;
836 list_add_tail(&cmd
->scmd
.link
, &smu
->cmd_list
);
837 if (smu
->cmd_cur
== NULL
)
840 list_add_tail(&cmd
->link
, &smu
->cmd_i2c_list
);
841 spin_unlock_irqrestore(&smu
->lock
, flags
);
849 * Userland driver interface
853 static LIST_HEAD(smu_clist
);
854 static DEFINE_SPINLOCK(smu_clist_lock
);
864 struct list_head list
;
865 enum smu_file_mode mode
;
869 wait_queue_head_t wait
;
870 u8 buffer
[SMU_MAX_DATA
];
874 static int smu_open(struct inode
*inode
, struct file
*file
)
876 struct smu_private
*pp
;
879 pp
= kmalloc(sizeof(struct smu_private
), GFP_KERNEL
);
882 memset(pp
, 0, sizeof(struct smu_private
));
883 spin_lock_init(&pp
->lock
);
884 pp
->mode
= smu_file_commands
;
885 init_waitqueue_head(&pp
->wait
);
887 spin_lock_irqsave(&smu_clist_lock
, flags
);
888 list_add(&pp
->list
, &smu_clist
);
889 spin_unlock_irqrestore(&smu_clist_lock
, flags
);
890 file
->private_data
= pp
;
896 static void smu_user_cmd_done(struct smu_cmd
*cmd
, void *misc
)
898 struct smu_private
*pp
= misc
;
900 wake_up_all(&pp
->wait
);
904 static ssize_t
smu_write(struct file
*file
, const char __user
*buf
,
905 size_t count
, loff_t
*ppos
)
907 struct smu_private
*pp
= file
->private_data
;
909 struct smu_user_cmd_hdr hdr
;
914 else if (copy_from_user(&hdr
, buf
, sizeof(hdr
)))
916 else if (hdr
.cmdtype
== SMU_CMDTYPE_WANTS_EVENTS
) {
917 pp
->mode
= smu_file_events
;
919 } else if (hdr
.cmdtype
!= SMU_CMDTYPE_SMU
)
921 else if (pp
->mode
!= smu_file_commands
)
923 else if (hdr
.data_len
> SMU_MAX_DATA
)
926 spin_lock_irqsave(&pp
->lock
, flags
);
928 spin_unlock_irqrestore(&pp
->lock
, flags
);
933 spin_unlock_irqrestore(&pp
->lock
, flags
);
935 if (copy_from_user(pp
->buffer
, buf
+ sizeof(hdr
), hdr
.data_len
)) {
940 pp
->cmd
.cmd
= hdr
.cmd
;
941 pp
->cmd
.data_len
= hdr
.data_len
;
942 pp
->cmd
.reply_len
= SMU_MAX_DATA
;
943 pp
->cmd
.data_buf
= pp
->buffer
;
944 pp
->cmd
.reply_buf
= pp
->buffer
;
945 pp
->cmd
.done
= smu_user_cmd_done
;
947 rc
= smu_queue_cmd(&pp
->cmd
);
954 static ssize_t
smu_read_command(struct file
*file
, struct smu_private
*pp
,
955 char __user
*buf
, size_t count
)
957 DECLARE_WAITQUEUE(wait
, current
);
958 struct smu_user_reply_hdr hdr
;
964 if (count
< sizeof(struct smu_user_reply_hdr
))
966 spin_lock_irqsave(&pp
->lock
, flags
);
967 if (pp
->cmd
.status
== 1) {
968 if (file
->f_flags
& O_NONBLOCK
)
970 add_wait_queue(&pp
->wait
, &wait
);
972 set_current_state(TASK_INTERRUPTIBLE
);
974 if (pp
->cmd
.status
!= 1)
977 if (signal_pending(current
))
979 spin_unlock_irqrestore(&pp
->lock
, flags
);
981 spin_lock_irqsave(&pp
->lock
, flags
);
983 set_current_state(TASK_RUNNING
);
984 remove_wait_queue(&pp
->wait
, &wait
);
986 spin_unlock_irqrestore(&pp
->lock
, flags
);
989 if (pp
->cmd
.status
!= 0)
990 pp
->cmd
.reply_len
= 0;
991 size
= sizeof(hdr
) + pp
->cmd
.reply_len
;
995 hdr
.status
= pp
->cmd
.status
;
996 hdr
.reply_len
= pp
->cmd
.reply_len
;
997 if (copy_to_user(buf
, &hdr
, sizeof(hdr
)))
1000 if (size
&& copy_to_user(buf
+ sizeof(hdr
), pp
->buffer
, size
))
1008 static ssize_t
smu_read_events(struct file
*file
, struct smu_private
*pp
,
1009 char __user
*buf
, size_t count
)
1011 /* Not implemented */
1012 msleep_interruptible(1000);
1017 static ssize_t
smu_read(struct file
*file
, char __user
*buf
,
1018 size_t count
, loff_t
*ppos
)
1020 struct smu_private
*pp
= file
->private_data
;
1022 if (pp
->mode
== smu_file_commands
)
1023 return smu_read_command(file
, pp
, buf
, count
);
1024 if (pp
->mode
== smu_file_events
)
1025 return smu_read_events(file
, pp
, buf
, count
);
1030 static unsigned int smu_fpoll(struct file
*file
, poll_table
*wait
)
1032 struct smu_private
*pp
= file
->private_data
;
1033 unsigned int mask
= 0;
1034 unsigned long flags
;
1039 if (pp
->mode
== smu_file_commands
) {
1040 poll_wait(file
, &pp
->wait
, wait
);
1042 spin_lock_irqsave(&pp
->lock
, flags
);
1043 if (pp
->busy
&& pp
->cmd
.status
!= 1)
1045 spin_unlock_irqrestore(&pp
->lock
, flags
);
1046 } if (pp
->mode
== smu_file_events
) {
1047 /* Not yet implemented */
1052 static int smu_release(struct inode
*inode
, struct file
*file
)
1054 struct smu_private
*pp
= file
->private_data
;
1055 unsigned long flags
;
1061 file
->private_data
= NULL
;
1063 /* Mark file as closing to avoid races with new request */
1064 spin_lock_irqsave(&pp
->lock
, flags
);
1065 pp
->mode
= smu_file_closing
;
1068 /* Wait for any pending request to complete */
1069 if (busy
&& pp
->cmd
.status
== 1) {
1070 DECLARE_WAITQUEUE(wait
, current
);
1072 add_wait_queue(&pp
->wait
, &wait
);
1074 set_current_state(TASK_UNINTERRUPTIBLE
);
1075 if (pp
->cmd
.status
!= 1)
1077 spin_lock_irqsave(&pp
->lock
, flags
);
1079 spin_unlock_irqrestore(&pp
->lock
, flags
);
1081 set_current_state(TASK_RUNNING
);
1082 remove_wait_queue(&pp
->wait
, &wait
);
1084 spin_unlock_irqrestore(&pp
->lock
, flags
);
1086 spin_lock_irqsave(&smu_clist_lock
, flags
);
1087 list_del(&pp
->list
);
1088 spin_unlock_irqrestore(&smu_clist_lock
, flags
);
1095 static struct file_operations smu_device_fops
= {
1096 .llseek
= no_llseek
,
1101 .release
= smu_release
,
1104 static struct miscdevice pmu_device
= {
1105 MISC_DYNAMIC_MINOR
, "smu", &smu_device_fops
1108 static int smu_device_init(void)
1112 if (misc_register(&pmu_device
) < 0)
1113 printk(KERN_ERR
"via-pmu: cannot register misc device.\n");
1116 device_initcall(smu_device_init
);