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 { udbg_printf(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
;
95 static DECLARE_MUTEX(smu_part_access
);
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 %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],
119 ((u8
*)cmd
->data_buf
)[4], ((u8
*)cmd
->data_buf
)[5],
120 ((u8
*)cmd
->data_buf
)[6], ((u8
*)cmd
->data_buf
)[7]);
122 /* Fill the SMU command buffer */
123 smu
->cmd_buf
->cmd
= cmd
->cmd
;
124 smu
->cmd_buf
->length
= cmd
->data_len
;
125 memcpy(smu
->cmd_buf
->data
, cmd
->data_buf
, cmd
->data_len
);
127 /* Flush command and data to RAM */
128 faddr
= (unsigned long)smu
->cmd_buf
;
129 fend
= faddr
+ smu
->cmd_buf
->length
+ 2;
130 flush_inval_dcache_range(faddr
, fend
);
132 /* This isn't exactly a DMA mapping here, I suspect
133 * the SMU is actually communicating with us via i2c to the
134 * northbridge or the CPU to access RAM.
136 writel(smu
->cmd_buf_abs
, smu
->db_buf
);
138 /* Ring the SMU doorbell */
139 pmac_do_feature_call(PMAC_FTR_WRITE_GPIO
, NULL
, smu
->doorbell
, 4);
143 static irqreturn_t
smu_db_intr(int irq
, void *arg
, struct pt_regs
*regs
)
147 void (*done
)(struct smu_cmd
*cmd
, void *misc
) = NULL
;
152 /* SMU completed the command, well, we hope, let's make sure
155 spin_lock_irqsave(&smu
->lock
, flags
);
157 gpio
= pmac_do_feature_call(PMAC_FTR_READ_GPIO
, NULL
, smu
->doorbell
);
158 if ((gpio
& 7) != 7) {
159 spin_unlock_irqrestore(&smu
->lock
, flags
);
173 /* CPU might have brought back the cache line, so we need
174 * to flush again before peeking at the SMU response. We
175 * flush the entire buffer for now as we haven't read the
176 * reply lenght (it's only 2 cache lines anyway)
178 faddr
= (unsigned long)smu
->cmd_buf
;
179 flush_inval_dcache_range(faddr
, faddr
+ 256);
182 ack
= (~cmd
->cmd
) & 0xff;
183 if (ack
!= smu
->cmd_buf
->cmd
) {
184 DPRINTK("SMU: incorrect ack, want %x got %x\n",
185 ack
, smu
->cmd_buf
->cmd
);
188 reply_len
= rc
== 0 ? smu
->cmd_buf
->length
: 0;
189 DPRINTK("SMU: reply len: %d\n", reply_len
);
190 if (reply_len
> cmd
->reply_len
) {
191 printk(KERN_WARNING
"SMU: reply buffer too small,"
192 "got %d bytes for a %d bytes buffer\n",
193 reply_len
, cmd
->reply_len
);
194 reply_len
= cmd
->reply_len
;
196 cmd
->reply_len
= reply_len
;
197 if (cmd
->reply_buf
&& reply_len
)
198 memcpy(cmd
->reply_buf
, smu
->cmd_buf
->data
, reply_len
);
201 /* Now complete the command. Write status last in order as we lost
202 * ownership of the command structure as soon as it's no longer -1
209 /* Start next command if any */
211 spin_unlock_irqrestore(&smu
->lock
, flags
);
213 /* Call command completion handler if any */
217 /* It's an edge interrupt, nothing to do */
222 static irqreturn_t
smu_msg_intr(int irq
, void *arg
, struct pt_regs
*regs
)
224 /* I don't quite know what to do with this one, we seem to never
225 * receive it, so I suspect we have to arm it someway in the SMU
226 * to start getting events that way.
229 printk(KERN_INFO
"SMU: message interrupt !\n");
231 /* It's an edge interrupt, nothing to do */
237 * Queued command management.
241 int smu_queue_cmd(struct smu_cmd
*cmd
)
247 if (cmd
->data_len
> SMU_MAX_DATA
||
248 cmd
->reply_len
> SMU_MAX_DATA
)
252 spin_lock_irqsave(&smu
->lock
, flags
);
253 list_add_tail(&cmd
->link
, &smu
->cmd_list
);
254 if (smu
->cmd_cur
== NULL
)
256 spin_unlock_irqrestore(&smu
->lock
, flags
);
260 EXPORT_SYMBOL(smu_queue_cmd
);
263 int smu_queue_simple(struct smu_simple_cmd
*scmd
, u8 command
,
264 unsigned int data_len
,
265 void (*done
)(struct smu_cmd
*cmd
, void *misc
),
268 struct smu_cmd
*cmd
= &scmd
->cmd
;
272 if (data_len
> sizeof(scmd
->buffer
))
275 memset(scmd
, 0, sizeof(*scmd
));
277 cmd
->data_len
= data_len
;
278 cmd
->data_buf
= scmd
->buffer
;
279 cmd
->reply_len
= sizeof(scmd
->buffer
);
280 cmd
->reply_buf
= scmd
->buffer
;
284 va_start(list
, misc
);
285 for (i
= 0; i
< data_len
; ++i
)
286 scmd
->buffer
[i
] = (u8
)va_arg(list
, int);
289 return smu_queue_cmd(cmd
);
291 EXPORT_SYMBOL(smu_queue_simple
);
301 gpio
= pmac_do_feature_call(PMAC_FTR_READ_GPIO
, NULL
, smu
->doorbell
);
303 smu_db_intr(smu
->db_irq
, smu
, NULL
);
305 EXPORT_SYMBOL(smu_poll
);
308 void smu_done_complete(struct smu_cmd
*cmd
, void *misc
)
310 struct completion
*comp
= misc
;
314 EXPORT_SYMBOL(smu_done_complete
);
317 void smu_spinwait_cmd(struct smu_cmd
*cmd
)
319 while(cmd
->status
== 1)
322 EXPORT_SYMBOL(smu_spinwait_cmd
);
325 /* RTC low level commands */
326 static inline int bcd2hex (int n
)
328 return (((n
& 0xf0) >> 4) * 10) + (n
& 0xf);
332 static inline int hex2bcd (int n
)
334 return ((n
/ 10) << 4) + (n
% 10);
338 static inline void smu_fill_set_rtc_cmd(struct smu_cmd_buf
*cmd_buf
,
339 struct rtc_time
*time
)
343 cmd_buf
->data
[0] = 0x80;
344 cmd_buf
->data
[1] = hex2bcd(time
->tm_sec
);
345 cmd_buf
->data
[2] = hex2bcd(time
->tm_min
);
346 cmd_buf
->data
[3] = hex2bcd(time
->tm_hour
);
347 cmd_buf
->data
[4] = time
->tm_wday
;
348 cmd_buf
->data
[5] = hex2bcd(time
->tm_mday
);
349 cmd_buf
->data
[6] = hex2bcd(time
->tm_mon
) + 1;
350 cmd_buf
->data
[7] = hex2bcd(time
->tm_year
- 100);
354 int smu_get_rtc_time(struct rtc_time
*time
, int spinwait
)
356 struct smu_simple_cmd cmd
;
362 memset(time
, 0, sizeof(struct rtc_time
));
363 rc
= smu_queue_simple(&cmd
, SMU_CMD_RTC_COMMAND
, 1, NULL
, NULL
,
364 SMU_CMD_RTC_GET_DATETIME
);
367 smu_spinwait_simple(&cmd
);
369 time
->tm_sec
= bcd2hex(cmd
.buffer
[0]);
370 time
->tm_min
= bcd2hex(cmd
.buffer
[1]);
371 time
->tm_hour
= bcd2hex(cmd
.buffer
[2]);
372 time
->tm_wday
= bcd2hex(cmd
.buffer
[3]);
373 time
->tm_mday
= bcd2hex(cmd
.buffer
[4]);
374 time
->tm_mon
= bcd2hex(cmd
.buffer
[5]) - 1;
375 time
->tm_year
= bcd2hex(cmd
.buffer
[6]) + 100;
381 int smu_set_rtc_time(struct rtc_time
*time
, int spinwait
)
383 struct smu_simple_cmd cmd
;
389 rc
= smu_queue_simple(&cmd
, SMU_CMD_RTC_COMMAND
, 8, NULL
, NULL
,
390 SMU_CMD_RTC_SET_DATETIME
,
391 hex2bcd(time
->tm_sec
),
392 hex2bcd(time
->tm_min
),
393 hex2bcd(time
->tm_hour
),
395 hex2bcd(time
->tm_mday
),
396 hex2bcd(time
->tm_mon
) + 1,
397 hex2bcd(time
->tm_year
- 100));
400 smu_spinwait_simple(&cmd
);
406 void smu_shutdown(void)
408 struct smu_simple_cmd cmd
;
413 if (smu_queue_simple(&cmd
, SMU_CMD_POWER_COMMAND
, 9, NULL
, NULL
,
414 'S', 'H', 'U', 'T', 'D', 'O', 'W', 'N', 0))
416 smu_spinwait_simple(&cmd
);
422 void smu_restart(void)
424 struct smu_simple_cmd cmd
;
429 if (smu_queue_simple(&cmd
, SMU_CMD_POWER_COMMAND
, 8, NULL
, NULL
,
430 'R', 'E', 'S', 'T', 'A', 'R', 'T', 0))
432 smu_spinwait_simple(&cmd
);
438 int smu_present(void)
442 EXPORT_SYMBOL(smu_present
);
445 int __init
smu_init (void)
447 struct device_node
*np
;
450 np
= of_find_node_by_type(NULL
, "smu");
454 printk(KERN_INFO
"SMU driver %s %s\n", VERSION
, AUTHOR
);
456 if (smu_cmdbuf_abs
== 0) {
457 printk(KERN_ERR
"SMU: Command buffer not allocated !\n");
461 smu
= alloc_bootmem(sizeof(struct smu_device
));
464 memset(smu
, 0, sizeof(*smu
));
466 spin_lock_init(&smu
->lock
);
467 INIT_LIST_HEAD(&smu
->cmd_list
);
468 INIT_LIST_HEAD(&smu
->cmd_i2c_list
);
470 smu
->db_irq
= NO_IRQ
;
471 smu
->msg_irq
= NO_IRQ
;
472 init_timer(&smu
->i2c_timer
);
474 /* smu_cmdbuf_abs is in the low 2G of RAM, can be converted to a
475 * 32 bits value safely
477 smu
->cmd_buf_abs
= (u32
)smu_cmdbuf_abs
;
478 smu
->cmd_buf
= (struct smu_cmd_buf
*)abs_to_virt(smu_cmdbuf_abs
);
480 np
= of_find_node_by_name(NULL
, "smu-doorbell");
482 printk(KERN_ERR
"SMU: Can't find doorbell GPIO !\n");
485 data
= (u32
*)get_property(np
, "reg", NULL
);
488 printk(KERN_ERR
"SMU: Can't find doorbell GPIO address !\n");
492 /* Current setup has one doorbell GPIO that does both doorbell
493 * and ack. GPIOs are at 0x50, best would be to find that out
494 * in the device-tree though.
496 smu
->doorbell
= *data
;
497 if (smu
->doorbell
< 0x50)
498 smu
->doorbell
+= 0x50;
500 smu
->db_irq
= np
->intrs
[0].line
;
504 /* Now look for the smu-interrupt GPIO */
506 np
= of_find_node_by_name(NULL
, "smu-interrupt");
509 data
= (u32
*)get_property(np
, "reg", NULL
);
518 smu
->msg_irq
= np
->intrs
[0].line
;
522 /* Doorbell buffer is currently hard-coded, I didn't find a proper
523 * device-tree entry giving the address. Best would probably to use
524 * an offset for K2 base though, but let's do it that way for now.
526 smu
->db_buf
= ioremap(0x8000860c, 0x1000);
527 if (smu
->db_buf
== NULL
) {
528 printk(KERN_ERR
"SMU: Can't map doorbell buffer pointer !\n");
532 sys_ctrler
= SYS_CTRLER_SMU
;
542 static int smu_late_init(void)
548 * Try to request the interrupts
551 if (smu
->db_irq
!= NO_IRQ
) {
552 if (request_irq(smu
->db_irq
, smu_db_intr
,
553 SA_SHIRQ
, "SMU doorbell", smu
) < 0) {
554 printk(KERN_WARNING
"SMU: can't "
555 "request interrupt %d\n",
557 smu
->db_irq
= NO_IRQ
;
561 if (smu
->msg_irq
!= NO_IRQ
) {
562 if (request_irq(smu
->msg_irq
, smu_msg_intr
,
563 SA_SHIRQ
, "SMU message", smu
) < 0) {
564 printk(KERN_WARNING
"SMU: can't "
565 "request interrupt %d\n",
567 smu
->msg_irq
= NO_IRQ
;
573 arch_initcall(smu_late_init
);
579 static void smu_expose_childs(void *unused
)
581 struct device_node
*np
;
583 for (np
= NULL
; (np
= of_get_next_child(smu
->of_node
, np
)) != NULL
;) {
584 if (device_is_compatible(np
, "smu-i2c")) {
586 u32
*reg
= (u32
*)get_property(np
, "reg", NULL
);
590 sprintf(name
, "smu-i2c-%02x", *reg
);
591 of_platform_device_create(np
, name
, &smu
->of_dev
->dev
);
593 if (device_is_compatible(np
, "smu-sensors"))
594 of_platform_device_create(np
, "smu-sensors", &smu
->of_dev
->dev
);
599 static DECLARE_WORK(smu_expose_childs_work
, smu_expose_childs
, NULL
);
601 static int smu_platform_probe(struct of_device
* dev
,
602 const struct of_device_id
*match
)
609 * Ok, we are matched, now expose all i2c busses. We have to defer
610 * that unfortunately or it would deadlock inside the device model
612 schedule_work(&smu_expose_childs_work
);
617 static struct of_device_id smu_platform_match
[] =
625 static struct of_platform_driver smu_of_platform_driver
=
628 .match_table
= smu_platform_match
,
629 .probe
= smu_platform_probe
,
632 static int __init
smu_init_sysfs(void)
637 * Due to sysfs bogosity, a sysdev is not a real device, so
638 * we should in fact create both if we want sysdev semantics
639 * for power management.
640 * For now, we don't power manage machines with an SMU chip,
641 * I'm a bit too far from figuring out how that works with those
642 * new chipsets, but that will come back and bite us
644 rc
= of_register_driver(&smu_of_platform_driver
);
648 device_initcall(smu_init_sysfs
);
650 struct of_device
*smu_get_ofdev(void)
657 EXPORT_SYMBOL_GPL(smu_get_ofdev
);
663 static void smu_i2c_complete_command(struct smu_i2c_cmd
*cmd
, int fail
)
665 void (*done
)(struct smu_i2c_cmd
*cmd
, void *misc
) = cmd
->done
;
666 void *misc
= cmd
->misc
;
669 /* Check for read case */
670 if (!fail
&& cmd
->read
) {
671 if (cmd
->pdata
[0] < 1)
674 memcpy(cmd
->info
.data
, &cmd
->pdata
[1],
678 DPRINTK("SMU: completing, success: %d\n", !fail
);
680 /* Update status and mark no pending i2c command with lock
681 * held so nobody comes in while we dequeue an eventual
682 * pending next i2c command
684 spin_lock_irqsave(&smu
->lock
, flags
);
685 smu
->cmd_i2c_cur
= NULL
;
687 cmd
->status
= fail
? -EIO
: 0;
689 /* Is there another i2c command waiting ? */
690 if (!list_empty(&smu
->cmd_i2c_list
)) {
691 struct smu_i2c_cmd
*newcmd
;
693 /* Fetch it, new current, remove from list */
694 newcmd
= list_entry(smu
->cmd_i2c_list
.next
,
695 struct smu_i2c_cmd
, link
);
696 smu
->cmd_i2c_cur
= newcmd
;
697 list_del(&cmd
->link
);
699 /* Queue with low level smu */
700 list_add_tail(&cmd
->scmd
.link
, &smu
->cmd_list
);
701 if (smu
->cmd_cur
== NULL
)
704 spin_unlock_irqrestore(&smu
->lock
, flags
);
706 /* Call command completion handler if any */
713 static void smu_i2c_retry(unsigned long data
)
715 struct smu_i2c_cmd
*cmd
= (struct smu_i2c_cmd
*)data
;
717 DPRINTK("SMU: i2c failure, requeuing...\n");
719 /* requeue command simply by resetting reply_len */
720 cmd
->pdata
[0] = 0xff;
721 cmd
->scmd
.reply_len
= 0x10;
722 smu_queue_cmd(&cmd
->scmd
);
726 static void smu_i2c_low_completion(struct smu_cmd
*scmd
, void *misc
)
728 struct smu_i2c_cmd
*cmd
= misc
;
731 DPRINTK("SMU: i2c compl. stage=%d status=%x pdata[0]=%x rlen: %x\n",
732 cmd
->stage
, scmd
->status
, cmd
->pdata
[0], scmd
->reply_len
);
734 /* Check for possible status */
735 if (scmd
->status
< 0)
737 else if (cmd
->read
) {
739 fail
= cmd
->pdata
[0] != 0;
741 fail
= cmd
->pdata
[0] >= 0x80;
743 fail
= cmd
->pdata
[0] != 0;
746 /* Handle failures by requeuing command, after 5ms interval
748 if (fail
&& --cmd
->retries
> 0) {
749 DPRINTK("SMU: i2c failure, starting timer...\n");
750 smu
->i2c_timer
.function
= smu_i2c_retry
;
751 smu
->i2c_timer
.data
= (unsigned long)cmd
;
752 smu
->i2c_timer
.expires
= jiffies
+ msecs_to_jiffies(5);
753 add_timer(&smu
->i2c_timer
);
757 /* If failure or stage 1, command is complete */
758 if (fail
|| cmd
->stage
!= 0) {
759 smu_i2c_complete_command(cmd
, fail
);
763 DPRINTK("SMU: going to stage 1\n");
765 /* Ok, initial command complete, now poll status */
766 scmd
->reply_buf
= cmd
->pdata
;
767 scmd
->reply_len
= 0x10;
768 scmd
->data_buf
= cmd
->pdata
;
777 int smu_queue_i2c(struct smu_i2c_cmd
*cmd
)
784 /* Fill most fields of scmd */
785 cmd
->scmd
.cmd
= SMU_CMD_I2C_COMMAND
;
786 cmd
->scmd
.done
= smu_i2c_low_completion
;
787 cmd
->scmd
.misc
= cmd
;
788 cmd
->scmd
.reply_buf
= cmd
->pdata
;
789 cmd
->scmd
.reply_len
= 0x10;
790 cmd
->scmd
.data_buf
= (u8
*)(char *)&cmd
->info
;
791 cmd
->scmd
.status
= 1;
793 cmd
->pdata
[0] = 0xff;
797 /* Check transfer type, sanitize some "info" fields
798 * based on transfer type and do more checking
800 cmd
->info
.caddr
= cmd
->info
.devaddr
;
801 cmd
->read
= cmd
->info
.devaddr
& 0x01;
802 switch(cmd
->info
.type
) {
803 case SMU_I2C_TRANSFER_SIMPLE
:
804 memset(&cmd
->info
.sublen
, 0, 4);
806 case SMU_I2C_TRANSFER_COMBINED
:
807 cmd
->info
.devaddr
&= 0xfe;
808 case SMU_I2C_TRANSFER_STDSUB
:
809 if (cmd
->info
.sublen
> 3)
816 /* Finish setting up command based on transfer direction
819 if (cmd
->info
.datalen
> SMU_I2C_READ_MAX
)
821 memset(cmd
->info
.data
, 0xff, cmd
->info
.datalen
);
822 cmd
->scmd
.data_len
= 9;
824 if (cmd
->info
.datalen
> SMU_I2C_WRITE_MAX
)
826 cmd
->scmd
.data_len
= 9 + cmd
->info
.datalen
;
829 DPRINTK("SMU: i2c enqueuing command\n");
830 DPRINTK("SMU: %s, len=%d bus=%x addr=%x sub0=%x type=%x\n",
831 cmd
->read
? "read" : "write", cmd
->info
.datalen
,
832 cmd
->info
.bus
, cmd
->info
.caddr
,
833 cmd
->info
.subaddr
[0], cmd
->info
.type
);
836 /* Enqueue command in i2c list, and if empty, enqueue also in
839 spin_lock_irqsave(&smu
->lock
, flags
);
840 if (smu
->cmd_i2c_cur
== NULL
) {
841 smu
->cmd_i2c_cur
= cmd
;
842 list_add_tail(&cmd
->scmd
.link
, &smu
->cmd_list
);
843 if (smu
->cmd_cur
== NULL
)
846 list_add_tail(&cmd
->link
, &smu
->cmd_i2c_list
);
847 spin_unlock_irqrestore(&smu
->lock
, flags
);
853 * Handling of "partitions"
856 static int smu_read_datablock(u8
*dest
, unsigned int addr
, unsigned int len
)
858 DECLARE_COMPLETION(comp
);
864 /* We currently use a chunk size of 0xe. We could check the
865 * SMU firmware version and use bigger sizes though
870 unsigned int clen
= min(len
, chunk
);
872 cmd
.cmd
= SMU_CMD_MISC_ee_COMMAND
;
874 cmd
.data_buf
= params
;
875 cmd
.reply_len
= chunk
;
876 cmd
.reply_buf
= dest
;
877 cmd
.done
= smu_done_complete
;
879 params
[0] = SMU_CMD_MISC_ee_GET_DATABLOCK_REC
;
881 *((u32
*)¶ms
[2]) = addr
;
884 rc
= smu_queue_cmd(&cmd
);
887 wait_for_completion(&comp
);
890 if (cmd
.reply_len
!= clen
) {
891 printk(KERN_DEBUG
"SMU: short read in "
892 "smu_read_datablock, got: %d, want: %d\n",
893 cmd
.reply_len
, clen
);
903 static struct smu_sdbp_header
*smu_create_sdb_partition(int id
)
905 DECLARE_COMPLETION(comp
);
906 struct smu_simple_cmd cmd
;
907 unsigned int addr
, len
, tlen
;
908 struct smu_sdbp_header
*hdr
;
909 struct property
*prop
;
911 /* First query the partition info */
912 smu_queue_simple(&cmd
, SMU_CMD_PARTITION_COMMAND
, 2,
913 smu_done_complete
, &comp
,
914 SMU_CMD_PARTITION_LATEST
, id
);
915 wait_for_completion(&comp
);
917 /* Partition doesn't exist (or other error) */
918 if (cmd
.cmd
.status
!= 0 || cmd
.cmd
.reply_len
!= 6)
921 /* Fetch address and length from reply */
922 addr
= *((u16
*)cmd
.buffer
);
923 len
= cmd
.buffer
[3] << 2;
924 /* Calucluate total length to allocate, including the 17 bytes
925 * for "sdb-partition-XX" that we append at the end of the buffer
927 tlen
= sizeof(struct property
) + len
+ 18;
929 prop
= kcalloc(tlen
, 1, GFP_KERNEL
);
932 hdr
= (struct smu_sdbp_header
*)(prop
+ 1);
933 prop
->name
= ((char *)prop
) + tlen
- 18;
934 sprintf(prop
->name
, "sdb-partition-%02x", id
);
936 prop
->value
= (unsigned char *)hdr
;
939 /* Read the datablock */
940 if (smu_read_datablock((u8
*)hdr
, addr
, len
)) {
941 printk(KERN_DEBUG
"SMU: datablock read failed while reading "
942 "partition %02x !\n", id
);
946 /* Got it, check a few things and create the property */
948 printk(KERN_DEBUG
"SMU: Reading partition %02x and got "
949 "%02x !\n", id
, hdr
->id
);
952 if (prom_add_property(smu
->of_node
, prop
)) {
953 printk(KERN_DEBUG
"SMU: Failed creating sdb-partition-%02x "
964 /* Note: Only allowed to return error code in pointers (using ERR_PTR)
965 * when interruptible is 1
967 struct smu_sdbp_header
*__smu_get_sdb_partition(int id
, unsigned int *size
,
971 struct smu_sdbp_header
*part
;
976 sprintf(pname
, "sdb-partition-%02x", id
);
980 rc
= down_interruptible(&smu_part_access
);
984 down(&smu_part_access
);
986 part
= (struct smu_sdbp_header
*)get_property(smu
->of_node
,
989 part
= smu_create_sdb_partition(id
);
990 if (part
!= NULL
&& size
)
991 *size
= part
->len
<< 2;
993 up(&smu_part_access
);
997 struct smu_sdbp_header
*smu_get_sdb_partition(int id
, unsigned int *size
)
999 return __smu_get_sdb_partition(id
, size
, 0);
1001 EXPORT_SYMBOL(smu_get_sdb_partition
);
1005 * Userland driver interface
1009 static LIST_HEAD(smu_clist
);
1010 static DEFINE_SPINLOCK(smu_clist_lock
);
1012 enum smu_file_mode
{
1020 struct list_head list
;
1021 enum smu_file_mode mode
;
1025 wait_queue_head_t wait
;
1026 u8 buffer
[SMU_MAX_DATA
];
1030 static int smu_open(struct inode
*inode
, struct file
*file
)
1032 struct smu_private
*pp
;
1033 unsigned long flags
;
1035 pp
= kmalloc(sizeof(struct smu_private
), GFP_KERNEL
);
1038 memset(pp
, 0, sizeof(struct smu_private
));
1039 spin_lock_init(&pp
->lock
);
1040 pp
->mode
= smu_file_commands
;
1041 init_waitqueue_head(&pp
->wait
);
1043 spin_lock_irqsave(&smu_clist_lock
, flags
);
1044 list_add(&pp
->list
, &smu_clist
);
1045 spin_unlock_irqrestore(&smu_clist_lock
, flags
);
1046 file
->private_data
= pp
;
1052 static void smu_user_cmd_done(struct smu_cmd
*cmd
, void *misc
)
1054 struct smu_private
*pp
= misc
;
1056 wake_up_all(&pp
->wait
);
1060 static ssize_t
smu_write(struct file
*file
, const char __user
*buf
,
1061 size_t count
, loff_t
*ppos
)
1063 struct smu_private
*pp
= file
->private_data
;
1064 unsigned long flags
;
1065 struct smu_user_cmd_hdr hdr
;
1070 else if (copy_from_user(&hdr
, buf
, sizeof(hdr
)))
1072 else if (hdr
.cmdtype
== SMU_CMDTYPE_WANTS_EVENTS
) {
1073 pp
->mode
= smu_file_events
;
1075 } else if (hdr
.cmdtype
== SMU_CMDTYPE_GET_PARTITION
) {
1076 struct smu_sdbp_header
*part
;
1077 part
= __smu_get_sdb_partition(hdr
.cmd
, NULL
, 1);
1080 else if (IS_ERR(part
))
1081 return PTR_ERR(part
);
1083 } else if (hdr
.cmdtype
!= SMU_CMDTYPE_SMU
)
1085 else if (pp
->mode
!= smu_file_commands
)
1087 else if (hdr
.data_len
> SMU_MAX_DATA
)
1090 spin_lock_irqsave(&pp
->lock
, flags
);
1092 spin_unlock_irqrestore(&pp
->lock
, flags
);
1097 spin_unlock_irqrestore(&pp
->lock
, flags
);
1099 if (copy_from_user(pp
->buffer
, buf
+ sizeof(hdr
), hdr
.data_len
)) {
1104 pp
->cmd
.cmd
= hdr
.cmd
;
1105 pp
->cmd
.data_len
= hdr
.data_len
;
1106 pp
->cmd
.reply_len
= SMU_MAX_DATA
;
1107 pp
->cmd
.data_buf
= pp
->buffer
;
1108 pp
->cmd
.reply_buf
= pp
->buffer
;
1109 pp
->cmd
.done
= smu_user_cmd_done
;
1111 rc
= smu_queue_cmd(&pp
->cmd
);
1118 static ssize_t
smu_read_command(struct file
*file
, struct smu_private
*pp
,
1119 char __user
*buf
, size_t count
)
1121 DECLARE_WAITQUEUE(wait
, current
);
1122 struct smu_user_reply_hdr hdr
;
1123 unsigned long flags
;
1128 if (count
< sizeof(struct smu_user_reply_hdr
))
1130 spin_lock_irqsave(&pp
->lock
, flags
);
1131 if (pp
->cmd
.status
== 1) {
1132 if (file
->f_flags
& O_NONBLOCK
)
1134 add_wait_queue(&pp
->wait
, &wait
);
1136 set_current_state(TASK_INTERRUPTIBLE
);
1138 if (pp
->cmd
.status
!= 1)
1141 if (signal_pending(current
))
1143 spin_unlock_irqrestore(&pp
->lock
, flags
);
1145 spin_lock_irqsave(&pp
->lock
, flags
);
1147 set_current_state(TASK_RUNNING
);
1148 remove_wait_queue(&pp
->wait
, &wait
);
1150 spin_unlock_irqrestore(&pp
->lock
, flags
);
1153 if (pp
->cmd
.status
!= 0)
1154 pp
->cmd
.reply_len
= 0;
1155 size
= sizeof(hdr
) + pp
->cmd
.reply_len
;
1159 hdr
.status
= pp
->cmd
.status
;
1160 hdr
.reply_len
= pp
->cmd
.reply_len
;
1161 if (copy_to_user(buf
, &hdr
, sizeof(hdr
)))
1163 size
-= sizeof(hdr
);
1164 if (size
&& copy_to_user(buf
+ sizeof(hdr
), pp
->buffer
, size
))
1172 static ssize_t
smu_read_events(struct file
*file
, struct smu_private
*pp
,
1173 char __user
*buf
, size_t count
)
1175 /* Not implemented */
1176 msleep_interruptible(1000);
1181 static ssize_t
smu_read(struct file
*file
, char __user
*buf
,
1182 size_t count
, loff_t
*ppos
)
1184 struct smu_private
*pp
= file
->private_data
;
1186 if (pp
->mode
== smu_file_commands
)
1187 return smu_read_command(file
, pp
, buf
, count
);
1188 if (pp
->mode
== smu_file_events
)
1189 return smu_read_events(file
, pp
, buf
, count
);
1194 static unsigned int smu_fpoll(struct file
*file
, poll_table
*wait
)
1196 struct smu_private
*pp
= file
->private_data
;
1197 unsigned int mask
= 0;
1198 unsigned long flags
;
1203 if (pp
->mode
== smu_file_commands
) {
1204 poll_wait(file
, &pp
->wait
, wait
);
1206 spin_lock_irqsave(&pp
->lock
, flags
);
1207 if (pp
->busy
&& pp
->cmd
.status
!= 1)
1209 spin_unlock_irqrestore(&pp
->lock
, flags
);
1210 } if (pp
->mode
== smu_file_events
) {
1211 /* Not yet implemented */
1216 static int smu_release(struct inode
*inode
, struct file
*file
)
1218 struct smu_private
*pp
= file
->private_data
;
1219 unsigned long flags
;
1225 file
->private_data
= NULL
;
1227 /* Mark file as closing to avoid races with new request */
1228 spin_lock_irqsave(&pp
->lock
, flags
);
1229 pp
->mode
= smu_file_closing
;
1232 /* Wait for any pending request to complete */
1233 if (busy
&& pp
->cmd
.status
== 1) {
1234 DECLARE_WAITQUEUE(wait
, current
);
1236 add_wait_queue(&pp
->wait
, &wait
);
1238 set_current_state(TASK_UNINTERRUPTIBLE
);
1239 if (pp
->cmd
.status
!= 1)
1241 spin_lock_irqsave(&pp
->lock
, flags
);
1243 spin_unlock_irqrestore(&pp
->lock
, flags
);
1245 set_current_state(TASK_RUNNING
);
1246 remove_wait_queue(&pp
->wait
, &wait
);
1248 spin_unlock_irqrestore(&pp
->lock
, flags
);
1250 spin_lock_irqsave(&smu_clist_lock
, flags
);
1251 list_del(&pp
->list
);
1252 spin_unlock_irqrestore(&smu_clist_lock
, flags
);
1259 static struct file_operations smu_device_fops
= {
1260 .llseek
= no_llseek
,
1265 .release
= smu_release
,
1268 static struct miscdevice pmu_device
= {
1269 MISC_DYNAMIC_MINOR
, "smu", &smu_device_fops
1272 static int smu_device_init(void)
1276 if (misc_register(&pmu_device
) < 0)
1277 printk(KERN_ERR
"via-pmu: cannot register misc device.\n");
1280 device_initcall(smu_device_init
);