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/smp_lock.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>
38 #include <linux/mutex.h>
39 #include <linux/of_device.h>
40 #include <linux/of_platform.h>
42 #include <asm/byteorder.h>
45 #include <asm/machdep.h>
46 #include <asm/pmac_feature.h>
48 #include <asm/sections.h>
49 #include <asm/abs_addr.h>
50 #include <asm/uaccess.h>
53 #define AUTHOR "(c) 2005 Benjamin Herrenschmidt, IBM Corp."
58 #define DPRINTK(fmt, args...) do { printk(KERN_DEBUG fmt , ##args); } while (0)
60 #define DPRINTK(fmt, args...) do { } while (0)
64 * This is the command buffer passed to the SMU hardware
66 #define SMU_MAX_DATA 254
71 u8 data[SMU_MAX_DATA];
76 struct device_node *of_node;
77 struct of_device *of_dev;
78 int doorbell; /* doorbell gpio */
79 u32 __iomem *db_buf; /* doorbell buffer */
80 struct device_node *db_node;
83 struct device_node *msg_node;
85 struct smu_cmd_buf *cmd_buf; /* command buffer virtual */
86 u32 cmd_buf_abs; /* command buffer absolute */
87 struct list_head cmd_list;
88 struct smu_cmd *cmd_cur; /* pending command */
90 struct list_head cmd_i2c_list;
91 struct smu_i2c_cmd *cmd_i2c_cur; /* pending i2c command */
92 struct timer_list i2c_timer;
96 * I don't think there will ever be more than one SMU, so
97 * for now, just hard code that
99 static struct smu_device *smu;
100 static DEFINE_MUTEX(smu_part_access);
101 static int smu_irq_inited;
103 static void smu_i2c_retry(unsigned long data);
106 * SMU driver low level stuff
109 static void smu_start_cmd(void)
111 unsigned long faddr, fend;
114 if (list_empty(&smu->cmd_list))
117 /* Fetch first command in queue */
118 cmd = list_entry(smu->cmd_list.next, struct smu_cmd, link);
120 list_del(&cmd->link);
122 DPRINTK("SMU: starting cmd %x, %d bytes data\n", cmd->cmd,
124 DPRINTK("SMU: data buffer: %02x %02x %02x %02x %02x %02x %02x %02x\n",
125 ((u8 *)cmd->data_buf)[0], ((u8 *)cmd->data_buf)[1],
126 ((u8 *)cmd->data_buf)[2], ((u8 *)cmd->data_buf)[3],
127 ((u8 *)cmd->data_buf)[4], ((u8 *)cmd->data_buf)[5],
128 ((u8 *)cmd->data_buf)[6], ((u8 *)cmd->data_buf)[7]);
130 /* Fill the SMU command buffer */
131 smu->cmd_buf->cmd = cmd->cmd;
132 smu->cmd_buf->length = cmd->data_len;
133 memcpy(smu->cmd_buf->data, cmd->data_buf, cmd->data_len);
135 /* Flush command and data to RAM */
136 faddr = (unsigned long)smu->cmd_buf;
137 fend = faddr + smu->cmd_buf->length + 2;
138 flush_inval_dcache_range(faddr, fend);
141 /* We also disable NAP mode for the duration of the command
142 * on U3 based machines.
143 * This is slightly racy as it can be written back to 1 by a sysctl
144 * but that never happens in practice. There seem to be an issue with
145 * U3 based machines such as the iMac G5 where napping for the
146 * whole duration of the command prevents the SMU from fetching it
147 * from memory. This might be related to the strange i2c based
148 * mechanism the SMU uses to access memory.
153 /* This isn't exactly a DMA mapping here, I suspect
154 * the SMU is actually communicating with us via i2c to the
155 * northbridge or the CPU to access RAM.
157 writel(smu->cmd_buf_abs, smu->db_buf);
159 /* Ring the SMU doorbell */
160 pmac_do_feature_call(PMAC_FTR_WRITE_GPIO, NULL, smu->doorbell, 4);
164 static irqreturn_t smu_db_intr(int irq, void *arg)
168 void (*done)(struct smu_cmd *cmd, void *misc) = NULL;
173 /* SMU completed the command, well, we hope, let's make sure
176 spin_lock_irqsave(&smu->lock, flags);
178 gpio = pmac_do_feature_call(PMAC_FTR_READ_GPIO, NULL, smu->doorbell);
179 if ((gpio & 7) != 7) {
180 spin_unlock_irqrestore(&smu->lock, flags);
194 /* CPU might have brought back the cache line, so we need
195 * to flush again before peeking at the SMU response. We
196 * flush the entire buffer for now as we haven't read the
197 * reply length (it's only 2 cache lines anyway)
199 faddr = (unsigned long)smu->cmd_buf;
200 flush_inval_dcache_range(faddr, faddr + 256);
203 ack = (~cmd->cmd) & 0xff;
204 if (ack != smu->cmd_buf->cmd) {
205 DPRINTK("SMU: incorrect ack, want %x got %x\n",
206 ack, smu->cmd_buf->cmd);
209 reply_len = rc == 0 ? smu->cmd_buf->length : 0;
210 DPRINTK("SMU: reply len: %d\n", reply_len);
211 if (reply_len > cmd->reply_len) {
212 printk(KERN_WARNING "SMU: reply buffer too small,"
213 "got %d bytes for a %d bytes buffer\n",
214 reply_len, cmd->reply_len);
215 reply_len = cmd->reply_len;
217 cmd->reply_len = reply_len;
218 if (cmd->reply_buf && reply_len)
219 memcpy(cmd->reply_buf, smu->cmd_buf->data, reply_len);
222 /* Now complete the command. Write status last in order as we lost
223 * ownership of the command structure as soon as it's no longer -1
230 /* Re-enable NAP mode */
234 /* Start next command if any */
236 spin_unlock_irqrestore(&smu->lock, flags);
238 /* Call command completion handler if any */
242 /* It's an edge interrupt, nothing to do */
247 static irqreturn_t smu_msg_intr(int irq, void *arg)
249 /* I don't quite know what to do with this one, we seem to never
250 * receive it, so I suspect we have to arm it someway in the SMU
251 * to start getting events that way.
254 printk(KERN_INFO "SMU: message interrupt !\n");
256 /* It's an edge interrupt, nothing to do */
262 * Queued command management.
266 int smu_queue_cmd(struct smu_cmd *cmd)
272 if (cmd->data_len > SMU_MAX_DATA ||
273 cmd->reply_len > SMU_MAX_DATA)
277 spin_lock_irqsave(&smu->lock, flags);
278 list_add_tail(&cmd->link, &smu->cmd_list);
279 if (smu->cmd_cur == NULL)
281 spin_unlock_irqrestore(&smu->lock, flags);
283 /* Workaround for early calls when irq isn't available */
284 if (!smu_irq_inited || smu->db_irq == NO_IRQ)
285 smu_spinwait_cmd(cmd);
289 EXPORT_SYMBOL(smu_queue_cmd);
292 int smu_queue_simple(struct smu_simple_cmd *scmd, u8 command,
293 unsigned int data_len,
294 void (*done)(struct smu_cmd *cmd, void *misc),
297 struct smu_cmd *cmd = &scmd->cmd;
301 if (data_len > sizeof(scmd->buffer))
304 memset(scmd, 0, sizeof(*scmd));
306 cmd->data_len = data_len;
307 cmd->data_buf = scmd->buffer;
308 cmd->reply_len = sizeof(scmd->buffer);
309 cmd->reply_buf = scmd->buffer;
313 va_start(list, misc);
314 for (i = 0; i < data_len; ++i)
315 scmd->buffer[i] = (u8)va_arg(list, int);
318 return smu_queue_cmd(cmd);
320 EXPORT_SYMBOL(smu_queue_simple);
330 gpio = pmac_do_feature_call(PMAC_FTR_READ_GPIO, NULL, smu->doorbell);
332 smu_db_intr(smu->db_irq, smu);
334 EXPORT_SYMBOL(smu_poll);
337 void smu_done_complete(struct smu_cmd *cmd, void *misc)
339 struct completion *comp = misc;
343 EXPORT_SYMBOL(smu_done_complete);
346 void smu_spinwait_cmd(struct smu_cmd *cmd)
348 while(cmd->status == 1)
351 EXPORT_SYMBOL(smu_spinwait_cmd);
354 /* RTC low level commands */
355 static inline int bcd2hex (int n)
357 return (((n & 0xf0) >> 4) * 10) + (n & 0xf);
361 static inline int hex2bcd (int n)
363 return ((n / 10) << 4) + (n % 10);
367 static inline void smu_fill_set_rtc_cmd(struct smu_cmd_buf *cmd_buf,
368 struct rtc_time *time)
372 cmd_buf->data[0] = 0x80;
373 cmd_buf->data[1] = hex2bcd(time->tm_sec);
374 cmd_buf->data[2] = hex2bcd(time->tm_min);
375 cmd_buf->data[3] = hex2bcd(time->tm_hour);
376 cmd_buf->data[4] = time->tm_wday;
377 cmd_buf->data[5] = hex2bcd(time->tm_mday);
378 cmd_buf->data[6] = hex2bcd(time->tm_mon) + 1;
379 cmd_buf->data[7] = hex2bcd(time->tm_year - 100);
383 int smu_get_rtc_time(struct rtc_time *time, int spinwait)
385 struct smu_simple_cmd cmd;
391 memset(time, 0, sizeof(struct rtc_time));
392 rc = smu_queue_simple(&cmd, SMU_CMD_RTC_COMMAND, 1, NULL, NULL,
393 SMU_CMD_RTC_GET_DATETIME);
396 smu_spinwait_simple(&cmd);
398 time->tm_sec = bcd2hex(cmd.buffer[0]);
399 time->tm_min = bcd2hex(cmd.buffer[1]);
400 time->tm_hour = bcd2hex(cmd.buffer[2]);
401 time->tm_wday = bcd2hex(cmd.buffer[3]);
402 time->tm_mday = bcd2hex(cmd.buffer[4]);
403 time->tm_mon = bcd2hex(cmd.buffer[5]) - 1;
404 time->tm_year = bcd2hex(cmd.buffer[6]) + 100;
410 int smu_set_rtc_time(struct rtc_time *time, int spinwait)
412 struct smu_simple_cmd cmd;
418 rc = smu_queue_simple(&cmd, SMU_CMD_RTC_COMMAND, 8, NULL, NULL,
419 SMU_CMD_RTC_SET_DATETIME,
420 hex2bcd(time->tm_sec),
421 hex2bcd(time->tm_min),
422 hex2bcd(time->tm_hour),
424 hex2bcd(time->tm_mday),
425 hex2bcd(time->tm_mon) + 1,
426 hex2bcd(time->tm_year - 100));
429 smu_spinwait_simple(&cmd);
435 void smu_shutdown(void)
437 struct smu_simple_cmd cmd;
442 if (smu_queue_simple(&cmd, SMU_CMD_POWER_COMMAND, 9, NULL, NULL,
443 'S', 'H', 'U', 'T', 'D', 'O', 'W', 'N', 0))
445 smu_spinwait_simple(&cmd);
451 void smu_restart(void)
453 struct smu_simple_cmd cmd;
458 if (smu_queue_simple(&cmd, SMU_CMD_POWER_COMMAND, 8, NULL, NULL,
459 'R', 'E', 'S', 'T', 'A', 'R', 'T', 0))
461 smu_spinwait_simple(&cmd);
467 int smu_present(void)
471 EXPORT_SYMBOL(smu_present);
474 int __init smu_init (void)
476 struct device_node *np;
480 np = of_find_node_by_type(NULL, "smu");
484 printk(KERN_INFO "SMU: Driver %s %s\n", VERSION, AUTHOR);
486 if (smu_cmdbuf_abs == 0) {
487 printk(KERN_ERR "SMU: Command buffer not allocated !\n");
492 smu = alloc_bootmem(sizeof(struct smu_device));
494 spin_lock_init(&smu->lock);
495 INIT_LIST_HEAD(&smu->cmd_list);
496 INIT_LIST_HEAD(&smu->cmd_i2c_list);
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");
513 data = of_get_property(smu->db_node, "reg", NULL);
515 printk(KERN_ERR "SMU: Can't find doorbell GPIO address !\n");
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 */
530 smu->msg_node = of_find_node_by_name(NULL, "smu-interrupt");
531 if (smu->msg_node == NULL)
533 data = of_get_property(smu->msg_node, "reg", NULL);
535 of_node_put(smu->msg_node);
536 smu->msg_node = NULL;
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");
555 /* U3 has an issue with NAP mode when issuing SMU commands */
556 smu->broken_nap = pmac_get_uninorth_variant() < 4;
558 printk(KERN_INFO "SMU: using NAP mode workaround\n");
560 sys_ctrler = SYS_CTRLER_SMU;
565 of_node_put(smu->msg_node);
567 of_node_put(smu->db_node);
569 free_bootmem((unsigned long)smu, sizeof(struct smu_device));
577 static int smu_late_init(void)
582 init_timer(&smu->i2c_timer);
583 smu->i2c_timer.function = smu_i2c_retry;
584 smu->i2c_timer.data = (unsigned long)smu;
587 smu->db_irq = irq_of_parse_and_map(smu->db_node, 0);
588 if (smu->db_irq == NO_IRQ)
589 printk(KERN_ERR "smu: failed to map irq for node %s\n",
590 smu->db_node->full_name);
593 smu->msg_irq = irq_of_parse_and_map(smu->msg_node, 0);
594 if (smu->msg_irq == NO_IRQ)
595 printk(KERN_ERR "smu: failed to map irq for node %s\n",
596 smu->msg_node->full_name);
600 * Try to request the interrupts
603 if (smu->db_irq != NO_IRQ) {
604 if (request_irq(smu->db_irq, smu_db_intr,
605 IRQF_SHARED, "SMU doorbell", smu) < 0) {
606 printk(KERN_WARNING "SMU: can't "
607 "request interrupt %d\n",
609 smu->db_irq = NO_IRQ;
613 if (smu->msg_irq != NO_IRQ) {
614 if (request_irq(smu->msg_irq, smu_msg_intr,
615 IRQF_SHARED, "SMU message", smu) < 0) {
616 printk(KERN_WARNING "SMU: can't "
617 "request interrupt %d\n",
619 smu->msg_irq = NO_IRQ;
626 /* This has to be before arch_initcall as the low i2c stuff relies on the
627 * above having been done before we reach arch_initcalls
629 core_initcall(smu_late_init);
635 static void smu_expose_childs(struct work_struct *unused)
637 struct device_node *np;
639 for (np = NULL; (np = of_get_next_child(smu->of_node, np)) != NULL;)
640 if (of_device_is_compatible(np, "smu-sensors"))
641 of_platform_device_create(np, "smu-sensors",
645 static DECLARE_WORK(smu_expose_childs_work, smu_expose_childs);
647 static int smu_platform_probe(struct of_device* dev,
648 const struct of_device_id *match)
655 * Ok, we are matched, now expose all i2c busses. We have to defer
656 * that unfortunately or it would deadlock inside the device model
658 schedule_work(&smu_expose_childs_work);
663 static struct of_device_id smu_platform_match[] =
671 static struct of_platform_driver smu_of_platform_driver =
674 .match_table = smu_platform_match,
675 .probe = smu_platform_probe,
678 static int __init smu_init_sysfs(void)
681 * Due to sysfs bogosity, a sysdev is not a real device, so
682 * we should in fact create both if we want sysdev semantics
683 * for power management.
684 * For now, we don't power manage machines with an SMU chip,
685 * I'm a bit too far from figuring out how that works with those
686 * new chipsets, but that will come back and bite us
688 of_register_platform_driver(&smu_of_platform_driver);
692 device_initcall(smu_init_sysfs);
694 struct of_device *smu_get_ofdev(void)
701 EXPORT_SYMBOL_GPL(smu_get_ofdev);
707 static void smu_i2c_complete_command(struct smu_i2c_cmd *cmd, int fail)
709 void (*done)(struct smu_i2c_cmd *cmd, void *misc) = cmd->done;
710 void *misc = cmd->misc;
713 /* Check for read case */
714 if (!fail && cmd->read) {
715 if (cmd->pdata[0] < 1)
718 memcpy(cmd->info.data, &cmd->pdata[1],
722 DPRINTK("SMU: completing, success: %d\n", !fail);
724 /* Update status and mark no pending i2c command with lock
725 * held so nobody comes in while we dequeue an eventual
726 * pending next i2c command
728 spin_lock_irqsave(&smu->lock, flags);
729 smu->cmd_i2c_cur = NULL;
731 cmd->status = fail ? -EIO : 0;
733 /* Is there another i2c command waiting ? */
734 if (!list_empty(&smu->cmd_i2c_list)) {
735 struct smu_i2c_cmd *newcmd;
737 /* Fetch it, new current, remove from list */
738 newcmd = list_entry(smu->cmd_i2c_list.next,
739 struct smu_i2c_cmd, link);
740 smu->cmd_i2c_cur = newcmd;
741 list_del(&cmd->link);
743 /* Queue with low level smu */
744 list_add_tail(&cmd->scmd.link, &smu->cmd_list);
745 if (smu->cmd_cur == NULL)
748 spin_unlock_irqrestore(&smu->lock, flags);
750 /* Call command completion handler if any */
757 static void smu_i2c_retry(unsigned long data)
759 struct smu_i2c_cmd *cmd = smu->cmd_i2c_cur;
761 DPRINTK("SMU: i2c failure, requeuing...\n");
763 /* requeue command simply by resetting reply_len */
764 cmd->pdata[0] = 0xff;
765 cmd->scmd.reply_len = sizeof(cmd->pdata);
766 smu_queue_cmd(&cmd->scmd);
770 static void smu_i2c_low_completion(struct smu_cmd *scmd, void *misc)
772 struct smu_i2c_cmd *cmd = misc;
775 DPRINTK("SMU: i2c compl. stage=%d status=%x pdata[0]=%x rlen: %x\n",
776 cmd->stage, scmd->status, cmd->pdata[0], scmd->reply_len);
778 /* Check for possible status */
779 if (scmd->status < 0)
781 else if (cmd->read) {
783 fail = cmd->pdata[0] != 0;
785 fail = cmd->pdata[0] >= 0x80;
787 fail = cmd->pdata[0] != 0;
790 /* Handle failures by requeuing command, after 5ms interval
792 if (fail && --cmd->retries > 0) {
793 DPRINTK("SMU: i2c failure, starting timer...\n");
794 BUG_ON(cmd != smu->cmd_i2c_cur);
795 if (!smu_irq_inited) {
800 mod_timer(&smu->i2c_timer, jiffies + msecs_to_jiffies(5));
804 /* If failure or stage 1, command is complete */
805 if (fail || cmd->stage != 0) {
806 smu_i2c_complete_command(cmd, fail);
810 DPRINTK("SMU: going to stage 1\n");
812 /* Ok, initial command complete, now poll status */
813 scmd->reply_buf = cmd->pdata;
814 scmd->reply_len = sizeof(cmd->pdata);
815 scmd->data_buf = cmd->pdata;
824 int smu_queue_i2c(struct smu_i2c_cmd *cmd)
831 /* Fill most fields of scmd */
832 cmd->scmd.cmd = SMU_CMD_I2C_COMMAND;
833 cmd->scmd.done = smu_i2c_low_completion;
834 cmd->scmd.misc = cmd;
835 cmd->scmd.reply_buf = cmd->pdata;
836 cmd->scmd.reply_len = sizeof(cmd->pdata);
837 cmd->scmd.data_buf = (u8 *)(char *)&cmd->info;
838 cmd->scmd.status = 1;
840 cmd->pdata[0] = 0xff;
844 /* Check transfer type, sanitize some "info" fields
845 * based on transfer type and do more checking
847 cmd->info.caddr = cmd->info.devaddr;
848 cmd->read = cmd->info.devaddr & 0x01;
849 switch(cmd->info.type) {
850 case SMU_I2C_TRANSFER_SIMPLE:
851 memset(&cmd->info.sublen, 0, 4);
853 case SMU_I2C_TRANSFER_COMBINED:
854 cmd->info.devaddr &= 0xfe;
855 case SMU_I2C_TRANSFER_STDSUB:
856 if (cmd->info.sublen > 3)
863 /* Finish setting up command based on transfer direction
866 if (cmd->info.datalen > SMU_I2C_READ_MAX)
868 memset(cmd->info.data, 0xff, cmd->info.datalen);
869 cmd->scmd.data_len = 9;
871 if (cmd->info.datalen > SMU_I2C_WRITE_MAX)
873 cmd->scmd.data_len = 9 + cmd->info.datalen;
876 DPRINTK("SMU: i2c enqueuing command\n");
877 DPRINTK("SMU: %s, len=%d bus=%x addr=%x sub0=%x type=%x\n",
878 cmd->read ? "read" : "write", cmd->info.datalen,
879 cmd->info.bus, cmd->info.caddr,
880 cmd->info.subaddr[0], cmd->info.type);
883 /* Enqueue command in i2c list, and if empty, enqueue also in
886 spin_lock_irqsave(&smu->lock, flags);
887 if (smu->cmd_i2c_cur == NULL) {
888 smu->cmd_i2c_cur = cmd;
889 list_add_tail(&cmd->scmd.link, &smu->cmd_list);
890 if (smu->cmd_cur == NULL)
893 list_add_tail(&cmd->link, &smu->cmd_i2c_list);
894 spin_unlock_irqrestore(&smu->lock, flags);
900 * Handling of "partitions"
903 static int smu_read_datablock(u8 *dest, unsigned int addr, unsigned int len)
905 DECLARE_COMPLETION_ONSTACK(comp);
911 /* We currently use a chunk size of 0xe. We could check the
912 * SMU firmware version and use bigger sizes though
917 unsigned int clen = min(len, chunk);
919 cmd.cmd = SMU_CMD_MISC_ee_COMMAND;
921 cmd.data_buf = params;
922 cmd.reply_len = chunk;
923 cmd.reply_buf = dest;
924 cmd.done = smu_done_complete;
926 params[0] = SMU_CMD_MISC_ee_GET_DATABLOCK_REC;
928 *((u32 *)¶ms[2]) = addr;
931 rc = smu_queue_cmd(&cmd);
934 wait_for_completion(&comp);
937 if (cmd.reply_len != clen) {
938 printk(KERN_DEBUG "SMU: short read in "
939 "smu_read_datablock, got: %d, want: %d\n",
940 cmd.reply_len, clen);
950 static struct smu_sdbp_header *smu_create_sdb_partition(int id)
952 DECLARE_COMPLETION_ONSTACK(comp);
953 struct smu_simple_cmd cmd;
954 unsigned int addr, len, tlen;
955 struct smu_sdbp_header *hdr;
956 struct property *prop;
958 /* First query the partition info */
959 DPRINTK("SMU: Query partition infos ... (irq=%d)\n", smu->db_irq);
960 smu_queue_simple(&cmd, SMU_CMD_PARTITION_COMMAND, 2,
961 smu_done_complete, &comp,
962 SMU_CMD_PARTITION_LATEST, id);
963 wait_for_completion(&comp);
964 DPRINTK("SMU: done, status: %d, reply_len: %d\n",
965 cmd.cmd.status, cmd.cmd.reply_len);
967 /* Partition doesn't exist (or other error) */
968 if (cmd.cmd.status != 0 || cmd.cmd.reply_len != 6)
971 /* Fetch address and length from reply */
972 addr = *((u16 *)cmd.buffer);
973 len = cmd.buffer[3] << 2;
974 /* Calucluate total length to allocate, including the 17 bytes
975 * for "sdb-partition-XX" that we append at the end of the buffer
977 tlen = sizeof(struct property) + len + 18;
979 prop = kzalloc(tlen, GFP_KERNEL);
982 hdr = (struct smu_sdbp_header *)(prop + 1);
983 prop->name = ((char *)prop) + tlen - 18;
984 sprintf(prop->name, "sdb-partition-%02x", id);
989 /* Read the datablock */
990 if (smu_read_datablock((u8 *)hdr, addr, len)) {
991 printk(KERN_DEBUG "SMU: datablock read failed while reading "
992 "partition %02x !\n", id);
996 /* Got it, check a few things and create the property */
998 printk(KERN_DEBUG "SMU: Reading partition %02x and got "
999 "%02x !\n", id, hdr->id);
1002 if (prom_add_property(smu->of_node, prop)) {
1003 printk(KERN_DEBUG "SMU: Failed creating sdb-partition-%02x "
1004 "property !\n", id);
1014 /* Note: Only allowed to return error code in pointers (using ERR_PTR)
1015 * when interruptible is 1
1017 const struct smu_sdbp_header *__smu_get_sdb_partition(int id,
1018 unsigned int *size, int interruptible)
1021 const struct smu_sdbp_header *part;
1026 sprintf(pname, "sdb-partition-%02x", id);
1028 DPRINTK("smu_get_sdb_partition(%02x)\n", id);
1030 if (interruptible) {
1032 rc = mutex_lock_interruptible(&smu_part_access);
1036 mutex_lock(&smu_part_access);
1038 part = of_get_property(smu->of_node, pname, size);
1040 DPRINTK("trying to extract from SMU ...\n");
1041 part = smu_create_sdb_partition(id);
1042 if (part != NULL && size)
1043 *size = part->len << 2;
1045 mutex_unlock(&smu_part_access);
1049 const struct smu_sdbp_header *smu_get_sdb_partition(int id, unsigned int *size)
1051 return __smu_get_sdb_partition(id, size, 0);
1053 EXPORT_SYMBOL(smu_get_sdb_partition);
1057 * Userland driver interface
1061 static LIST_HEAD(smu_clist);
1062 static DEFINE_SPINLOCK(smu_clist_lock);
1064 enum smu_file_mode {
1072 struct list_head list;
1073 enum smu_file_mode mode;
1077 wait_queue_head_t wait;
1078 u8 buffer[SMU_MAX_DATA];
1082 static int smu_open(struct inode *inode, struct file *file)
1084 struct smu_private *pp;
1085 unsigned long flags;
1087 pp = kzalloc(sizeof(struct smu_private), GFP_KERNEL);
1090 spin_lock_init(&pp->lock);
1091 pp->mode = smu_file_commands;
1092 init_waitqueue_head(&pp->wait);
1095 spin_lock_irqsave(&smu_clist_lock, flags);
1096 list_add(&pp->list, &smu_clist);
1097 spin_unlock_irqrestore(&smu_clist_lock, flags);
1098 file->private_data = pp;
1105 static void smu_user_cmd_done(struct smu_cmd *cmd, void *misc)
1107 struct smu_private *pp = misc;
1109 wake_up_all(&pp->wait);
1113 static ssize_t smu_write(struct file *file, const char __user *buf,
1114 size_t count, loff_t *ppos)
1116 struct smu_private *pp = file->private_data;
1117 unsigned long flags;
1118 struct smu_user_cmd_hdr hdr;
1123 else if (copy_from_user(&hdr, buf, sizeof(hdr)))
1125 else if (hdr.cmdtype == SMU_CMDTYPE_WANTS_EVENTS) {
1126 pp->mode = smu_file_events;
1128 } else if (hdr.cmdtype == SMU_CMDTYPE_GET_PARTITION) {
1129 const struct smu_sdbp_header *part;
1130 part = __smu_get_sdb_partition(hdr.cmd, NULL, 1);
1133 else if (IS_ERR(part))
1134 return PTR_ERR(part);
1136 } else if (hdr.cmdtype != SMU_CMDTYPE_SMU)
1138 else if (pp->mode != smu_file_commands)
1140 else if (hdr.data_len > SMU_MAX_DATA)
1143 spin_lock_irqsave(&pp->lock, flags);
1145 spin_unlock_irqrestore(&pp->lock, flags);
1150 spin_unlock_irqrestore(&pp->lock, flags);
1152 if (copy_from_user(pp->buffer, buf + sizeof(hdr), hdr.data_len)) {
1157 pp->cmd.cmd = hdr.cmd;
1158 pp->cmd.data_len = hdr.data_len;
1159 pp->cmd.reply_len = SMU_MAX_DATA;
1160 pp->cmd.data_buf = pp->buffer;
1161 pp->cmd.reply_buf = pp->buffer;
1162 pp->cmd.done = smu_user_cmd_done;
1164 rc = smu_queue_cmd(&pp->cmd);
1171 static ssize_t smu_read_command(struct file *file, struct smu_private *pp,
1172 char __user *buf, size_t count)
1174 DECLARE_WAITQUEUE(wait, current);
1175 struct smu_user_reply_hdr hdr;
1176 unsigned long flags;
1181 if (count < sizeof(struct smu_user_reply_hdr))
1183 spin_lock_irqsave(&pp->lock, flags);
1184 if (pp->cmd.status == 1) {
1185 if (file->f_flags & O_NONBLOCK)
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);