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/sysdev.h>
36 #include <linux/poll.h>
37 #include <linux/mutex.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;
95 static DEFINE_MUTEX(smu_part_access);
97 static void smu_i2c_retry(unsigned long data);
100 * SMU driver low level stuff
103 static void smu_start_cmd(void)
105 unsigned long faddr, fend;
108 if (list_empty(&smu->cmd_list))
111 /* Fetch first command in queue */
112 cmd = list_entry(smu->cmd_list.next, struct smu_cmd, link);
114 list_del(&cmd->link);
116 DPRINTK("SMU: starting cmd %x, %d bytes data\n", cmd->cmd,
118 DPRINTK("SMU: data buffer: %02x %02x %02x %02x %02x %02x %02x %02x\n",
119 ((u8 *)cmd->data_buf)[0], ((u8 *)cmd->data_buf)[1],
120 ((u8 *)cmd->data_buf)[2], ((u8 *)cmd->data_buf)[3],
121 ((u8 *)cmd->data_buf)[4], ((u8 *)cmd->data_buf)[5],
122 ((u8 *)cmd->data_buf)[6], ((u8 *)cmd->data_buf)[7]);
124 /* Fill the SMU command buffer */
125 smu->cmd_buf->cmd = cmd->cmd;
126 smu->cmd_buf->length = cmd->data_len;
127 memcpy(smu->cmd_buf->data, cmd->data_buf, cmd->data_len);
129 /* Flush command and data to RAM */
130 faddr = (unsigned long)smu->cmd_buf;
131 fend = faddr + smu->cmd_buf->length + 2;
132 flush_inval_dcache_range(faddr, fend);
134 /* This isn't exactly a DMA mapping here, I suspect
135 * the SMU is actually communicating with us via i2c to the
136 * northbridge or the CPU to access RAM.
138 writel(smu->cmd_buf_abs, smu->db_buf);
140 /* Ring the SMU doorbell */
141 pmac_do_feature_call(PMAC_FTR_WRITE_GPIO, NULL, smu->doorbell, 4);
145 static irqreturn_t smu_db_intr(int irq, void *arg, struct pt_regs *regs)
149 void (*done)(struct smu_cmd *cmd, void *misc) = NULL;
154 /* SMU completed the command, well, we hope, let's make sure
157 spin_lock_irqsave(&smu->lock, flags);
159 gpio = pmac_do_feature_call(PMAC_FTR_READ_GPIO, NULL, smu->doorbell);
160 if ((gpio & 7) != 7) {
161 spin_unlock_irqrestore(&smu->lock, flags);
175 /* CPU might have brought back the cache line, so we need
176 * to flush again before peeking at the SMU response. We
177 * flush the entire buffer for now as we haven't read the
178 * reply lenght (it's only 2 cache lines anyway)
180 faddr = (unsigned long)smu->cmd_buf;
181 flush_inval_dcache_range(faddr, faddr + 256);
184 ack = (~cmd->cmd) & 0xff;
185 if (ack != smu->cmd_buf->cmd) {
186 DPRINTK("SMU: incorrect ack, want %x got %x\n",
187 ack, smu->cmd_buf->cmd);
190 reply_len = rc == 0 ? smu->cmd_buf->length : 0;
191 DPRINTK("SMU: reply len: %d\n", reply_len);
192 if (reply_len > cmd->reply_len) {
193 printk(KERN_WARNING "SMU: reply buffer too small,"
194 "got %d bytes for a %d bytes buffer\n",
195 reply_len, cmd->reply_len);
196 reply_len = cmd->reply_len;
198 cmd->reply_len = reply_len;
199 if (cmd->reply_buf && reply_len)
200 memcpy(cmd->reply_buf, smu->cmd_buf->data, reply_len);
203 /* Now complete the command. Write status last in order as we lost
204 * ownership of the command structure as soon as it's no longer -1
211 /* Start next command if any */
213 spin_unlock_irqrestore(&smu->lock, flags);
215 /* Call command completion handler if any */
219 /* It's an edge interrupt, nothing to do */
224 static irqreturn_t smu_msg_intr(int irq, void *arg, struct pt_regs *regs)
226 /* I don't quite know what to do with this one, we seem to never
227 * receive it, so I suspect we have to arm it someway in the SMU
228 * to start getting events that way.
231 printk(KERN_INFO "SMU: message interrupt !\n");
233 /* It's an edge interrupt, nothing to do */
239 * Queued command management.
243 int smu_queue_cmd(struct smu_cmd *cmd)
249 if (cmd->data_len > SMU_MAX_DATA ||
250 cmd->reply_len > SMU_MAX_DATA)
254 spin_lock_irqsave(&smu->lock, flags);
255 list_add_tail(&cmd->link, &smu->cmd_list);
256 if (smu->cmd_cur == NULL)
258 spin_unlock_irqrestore(&smu->lock, flags);
262 EXPORT_SYMBOL(smu_queue_cmd);
265 int smu_queue_simple(struct smu_simple_cmd *scmd, u8 command,
266 unsigned int data_len,
267 void (*done)(struct smu_cmd *cmd, void *misc),
270 struct smu_cmd *cmd = &scmd->cmd;
274 if (data_len > sizeof(scmd->buffer))
277 memset(scmd, 0, sizeof(*scmd));
279 cmd->data_len = data_len;
280 cmd->data_buf = scmd->buffer;
281 cmd->reply_len = sizeof(scmd->buffer);
282 cmd->reply_buf = scmd->buffer;
286 va_start(list, misc);
287 for (i = 0; i < data_len; ++i)
288 scmd->buffer[i] = (u8)va_arg(list, int);
291 return smu_queue_cmd(cmd);
293 EXPORT_SYMBOL(smu_queue_simple);
303 gpio = pmac_do_feature_call(PMAC_FTR_READ_GPIO, NULL, smu->doorbell);
305 smu_db_intr(smu->db_irq, smu, NULL);
307 EXPORT_SYMBOL(smu_poll);
310 void smu_done_complete(struct smu_cmd *cmd, void *misc)
312 struct completion *comp = misc;
316 EXPORT_SYMBOL(smu_done_complete);
319 void smu_spinwait_cmd(struct smu_cmd *cmd)
321 while(cmd->status == 1)
324 EXPORT_SYMBOL(smu_spinwait_cmd);
327 /* RTC low level commands */
328 static inline int bcd2hex (int n)
330 return (((n & 0xf0) >> 4) * 10) + (n & 0xf);
334 static inline int hex2bcd (int n)
336 return ((n / 10) << 4) + (n % 10);
340 static inline void smu_fill_set_rtc_cmd(struct smu_cmd_buf *cmd_buf,
341 struct rtc_time *time)
345 cmd_buf->data[0] = 0x80;
346 cmd_buf->data[1] = hex2bcd(time->tm_sec);
347 cmd_buf->data[2] = hex2bcd(time->tm_min);
348 cmd_buf->data[3] = hex2bcd(time->tm_hour);
349 cmd_buf->data[4] = time->tm_wday;
350 cmd_buf->data[5] = hex2bcd(time->tm_mday);
351 cmd_buf->data[6] = hex2bcd(time->tm_mon) + 1;
352 cmd_buf->data[7] = hex2bcd(time->tm_year - 100);
356 int smu_get_rtc_time(struct rtc_time *time, int spinwait)
358 struct smu_simple_cmd cmd;
364 memset(time, 0, sizeof(struct rtc_time));
365 rc = smu_queue_simple(&cmd, SMU_CMD_RTC_COMMAND, 1, NULL, NULL,
366 SMU_CMD_RTC_GET_DATETIME);
369 smu_spinwait_simple(&cmd);
371 time->tm_sec = bcd2hex(cmd.buffer[0]);
372 time->tm_min = bcd2hex(cmd.buffer[1]);
373 time->tm_hour = bcd2hex(cmd.buffer[2]);
374 time->tm_wday = bcd2hex(cmd.buffer[3]);
375 time->tm_mday = bcd2hex(cmd.buffer[4]);
376 time->tm_mon = bcd2hex(cmd.buffer[5]) - 1;
377 time->tm_year = bcd2hex(cmd.buffer[6]) + 100;
383 int smu_set_rtc_time(struct rtc_time *time, int spinwait)
385 struct smu_simple_cmd cmd;
391 rc = smu_queue_simple(&cmd, SMU_CMD_RTC_COMMAND, 8, NULL, NULL,
392 SMU_CMD_RTC_SET_DATETIME,
393 hex2bcd(time->tm_sec),
394 hex2bcd(time->tm_min),
395 hex2bcd(time->tm_hour),
397 hex2bcd(time->tm_mday),
398 hex2bcd(time->tm_mon) + 1,
399 hex2bcd(time->tm_year - 100));
402 smu_spinwait_simple(&cmd);
408 void smu_shutdown(void)
410 struct smu_simple_cmd cmd;
415 if (smu_queue_simple(&cmd, SMU_CMD_POWER_COMMAND, 9, NULL, NULL,
416 'S', 'H', 'U', 'T', 'D', 'O', 'W', 'N', 0))
418 smu_spinwait_simple(&cmd);
424 void smu_restart(void)
426 struct smu_simple_cmd cmd;
431 if (smu_queue_simple(&cmd, SMU_CMD_POWER_COMMAND, 8, NULL, NULL,
432 'R', 'E', 'S', 'T', 'A', 'R', 'T', 0))
434 smu_spinwait_simple(&cmd);
440 int smu_present(void)
444 EXPORT_SYMBOL(smu_present);
447 int __init smu_init (void)
449 struct device_node *np;
452 np = of_find_node_by_type(NULL, "smu");
456 printk(KERN_INFO "SMU driver %s %s\n", VERSION, AUTHOR);
458 if (smu_cmdbuf_abs == 0) {
459 printk(KERN_ERR "SMU: Command buffer not allocated !\n");
463 smu = alloc_bootmem(sizeof(struct smu_device));
466 memset(smu, 0, sizeof(*smu));
468 spin_lock_init(&smu->lock);
469 INIT_LIST_HEAD(&smu->cmd_list);
470 INIT_LIST_HEAD(&smu->cmd_i2c_list);
472 smu->db_irq = NO_IRQ;
473 smu->msg_irq = NO_IRQ;
475 /* smu_cmdbuf_abs is in the low 2G of RAM, can be converted to a
476 * 32 bits value safely
478 smu->cmd_buf_abs = (u32)smu_cmdbuf_abs;
479 smu->cmd_buf = (struct smu_cmd_buf *)abs_to_virt(smu_cmdbuf_abs);
481 np = of_find_node_by_name(NULL, "smu-doorbell");
483 printk(KERN_ERR "SMU: Can't find doorbell GPIO !\n");
486 data = (u32 *)get_property(np, "reg", NULL);
489 printk(KERN_ERR "SMU: Can't find doorbell GPIO address !\n");
493 /* Current setup has one doorbell GPIO that does both doorbell
494 * and ack. GPIOs are at 0x50, best would be to find that out
495 * in the device-tree though.
497 smu->doorbell = *data;
498 if (smu->doorbell < 0x50)
499 smu->doorbell += 0x50;
501 smu->db_irq = np->intrs[0].line;
505 /* Now look for the smu-interrupt GPIO */
507 np = of_find_node_by_name(NULL, "smu-interrupt");
510 data = (u32 *)get_property(np, "reg", NULL);
519 smu->msg_irq = np->intrs[0].line;
523 /* Doorbell buffer is currently hard-coded, I didn't find a proper
524 * device-tree entry giving the address. Best would probably to use
525 * an offset for K2 base though, but let's do it that way for now.
527 smu->db_buf = ioremap(0x8000860c, 0x1000);
528 if (smu->db_buf == NULL) {
529 printk(KERN_ERR "SMU: Can't map doorbell buffer pointer !\n");
533 sys_ctrler = SYS_CTRLER_SMU;
543 static int smu_late_init(void)
548 init_timer(&smu->i2c_timer);
549 smu->i2c_timer.function = smu_i2c_retry;
550 smu->i2c_timer.data = (unsigned long)smu;
553 * Try to request the interrupts
556 if (smu->db_irq != NO_IRQ) {
557 if (request_irq(smu->db_irq, smu_db_intr,
558 IRQF_SHARED, "SMU doorbell", smu) < 0) {
559 printk(KERN_WARNING "SMU: can't "
560 "request interrupt %d\n",
562 smu->db_irq = NO_IRQ;
566 if (smu->msg_irq != NO_IRQ) {
567 if (request_irq(smu->msg_irq, smu_msg_intr,
568 IRQF_SHARED, "SMU message", smu) < 0) {
569 printk(KERN_WARNING "SMU: can't "
570 "request interrupt %d\n",
572 smu->msg_irq = NO_IRQ;
578 /* This has to be before arch_initcall as the low i2c stuff relies on the
579 * above having been done before we reach arch_initcalls
581 core_initcall(smu_late_init);
587 static void smu_expose_childs(void *unused)
589 struct device_node *np;
591 for (np = NULL; (np = of_get_next_child(smu->of_node, np)) != NULL;)
592 if (device_is_compatible(np, "smu-sensors"))
593 of_platform_device_create(np, "smu-sensors",
597 static DECLARE_WORK(smu_expose_childs_work, smu_expose_childs, NULL);
599 static int smu_platform_probe(struct of_device* dev,
600 const struct of_device_id *match)
607 * Ok, we are matched, now expose all i2c busses. We have to defer
608 * that unfortunately or it would deadlock inside the device model
610 schedule_work(&smu_expose_childs_work);
615 static struct of_device_id smu_platform_match[] =
623 static struct of_platform_driver smu_of_platform_driver =
626 .match_table = smu_platform_match,
627 .probe = smu_platform_probe,
630 static int __init smu_init_sysfs(void)
633 * Due to sysfs bogosity, a sysdev is not a real device, so
634 * we should in fact create both if we want sysdev semantics
635 * for power management.
636 * For now, we don't power manage machines with an SMU chip,
637 * I'm a bit too far from figuring out how that works with those
638 * new chipsets, but that will come back and bite us
640 of_register_driver(&smu_of_platform_driver);
644 device_initcall(smu_init_sysfs);
646 struct of_device *smu_get_ofdev(void)
653 EXPORT_SYMBOL_GPL(smu_get_ofdev);
659 static void smu_i2c_complete_command(struct smu_i2c_cmd *cmd, int fail)
661 void (*done)(struct smu_i2c_cmd *cmd, void *misc) = cmd->done;
662 void *misc = cmd->misc;
665 /* Check for read case */
666 if (!fail && cmd->read) {
667 if (cmd->pdata[0] < 1)
670 memcpy(cmd->info.data, &cmd->pdata[1],
674 DPRINTK("SMU: completing, success: %d\n", !fail);
676 /* Update status and mark no pending i2c command with lock
677 * held so nobody comes in while we dequeue an eventual
678 * pending next i2c command
680 spin_lock_irqsave(&smu->lock, flags);
681 smu->cmd_i2c_cur = NULL;
683 cmd->status = fail ? -EIO : 0;
685 /* Is there another i2c command waiting ? */
686 if (!list_empty(&smu->cmd_i2c_list)) {
687 struct smu_i2c_cmd *newcmd;
689 /* Fetch it, new current, remove from list */
690 newcmd = list_entry(smu->cmd_i2c_list.next,
691 struct smu_i2c_cmd, link);
692 smu->cmd_i2c_cur = newcmd;
693 list_del(&cmd->link);
695 /* Queue with low level smu */
696 list_add_tail(&cmd->scmd.link, &smu->cmd_list);
697 if (smu->cmd_cur == NULL)
700 spin_unlock_irqrestore(&smu->lock, flags);
702 /* Call command completion handler if any */
709 static void smu_i2c_retry(unsigned long data)
711 struct smu_i2c_cmd *cmd = smu->cmd_i2c_cur;
713 DPRINTK("SMU: i2c failure, requeuing...\n");
715 /* requeue command simply by resetting reply_len */
716 cmd->pdata[0] = 0xff;
717 cmd->scmd.reply_len = sizeof(cmd->pdata);
718 smu_queue_cmd(&cmd->scmd);
722 static void smu_i2c_low_completion(struct smu_cmd *scmd, void *misc)
724 struct smu_i2c_cmd *cmd = misc;
727 DPRINTK("SMU: i2c compl. stage=%d status=%x pdata[0]=%x rlen: %x\n",
728 cmd->stage, scmd->status, cmd->pdata[0], scmd->reply_len);
730 /* Check for possible status */
731 if (scmd->status < 0)
733 else if (cmd->read) {
735 fail = cmd->pdata[0] != 0;
737 fail = cmd->pdata[0] >= 0x80;
739 fail = cmd->pdata[0] != 0;
742 /* Handle failures by requeuing command, after 5ms interval
744 if (fail && --cmd->retries > 0) {
745 DPRINTK("SMU: i2c failure, starting timer...\n");
746 BUG_ON(cmd != smu->cmd_i2c_cur);
747 mod_timer(&smu->i2c_timer, jiffies + msecs_to_jiffies(5));
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 = sizeof(cmd->pdata);
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 = sizeof(cmd->pdata);
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);
847 * Handling of "partitions"
850 static int smu_read_datablock(u8 *dest, unsigned int addr, unsigned int len)
852 DECLARE_COMPLETION(comp);
858 /* We currently use a chunk size of 0xe. We could check the
859 * SMU firmware version and use bigger sizes though
864 unsigned int clen = min(len, chunk);
866 cmd.cmd = SMU_CMD_MISC_ee_COMMAND;
868 cmd.data_buf = params;
869 cmd.reply_len = chunk;
870 cmd.reply_buf = dest;
871 cmd.done = smu_done_complete;
873 params[0] = SMU_CMD_MISC_ee_GET_DATABLOCK_REC;
875 *((u32 *)¶ms[2]) = addr;
878 rc = smu_queue_cmd(&cmd);
881 wait_for_completion(&comp);
884 if (cmd.reply_len != clen) {
885 printk(KERN_DEBUG "SMU: short read in "
886 "smu_read_datablock, got: %d, want: %d\n",
887 cmd.reply_len, clen);
897 static struct smu_sdbp_header *smu_create_sdb_partition(int id)
899 DECLARE_COMPLETION(comp);
900 struct smu_simple_cmd cmd;
901 unsigned int addr, len, tlen;
902 struct smu_sdbp_header *hdr;
903 struct property *prop;
905 /* First query the partition info */
906 DPRINTK("SMU: Query partition infos ... (irq=%d)\n", smu->db_irq);
907 smu_queue_simple(&cmd, SMU_CMD_PARTITION_COMMAND, 2,
908 smu_done_complete, &comp,
909 SMU_CMD_PARTITION_LATEST, id);
910 wait_for_completion(&comp);
911 DPRINTK("SMU: done, status: %d, reply_len: %d\n",
912 cmd.cmd.status, cmd.cmd.reply_len);
914 /* Partition doesn't exist (or other error) */
915 if (cmd.cmd.status != 0 || cmd.cmd.reply_len != 6)
918 /* Fetch address and length from reply */
919 addr = *((u16 *)cmd.buffer);
920 len = cmd.buffer[3] << 2;
921 /* Calucluate total length to allocate, including the 17 bytes
922 * for "sdb-partition-XX" that we append at the end of the buffer
924 tlen = sizeof(struct property) + len + 18;
926 prop = kcalloc(tlen, 1, GFP_KERNEL);
929 hdr = (struct smu_sdbp_header *)(prop + 1);
930 prop->name = ((char *)prop) + tlen - 18;
931 sprintf(prop->name, "sdb-partition-%02x", id);
933 prop->value = (unsigned char *)hdr;
936 /* Read the datablock */
937 if (smu_read_datablock((u8 *)hdr, addr, len)) {
938 printk(KERN_DEBUG "SMU: datablock read failed while reading "
939 "partition %02x !\n", id);
943 /* Got it, check a few things and create the property */
945 printk(KERN_DEBUG "SMU: Reading partition %02x and got "
946 "%02x !\n", id, hdr->id);
949 if (prom_add_property(smu->of_node, prop)) {
950 printk(KERN_DEBUG "SMU: Failed creating sdb-partition-%02x "
961 /* Note: Only allowed to return error code in pointers (using ERR_PTR)
962 * when interruptible is 1
964 struct smu_sdbp_header *__smu_get_sdb_partition(int id, unsigned int *size,
968 struct smu_sdbp_header *part;
973 sprintf(pname, "sdb-partition-%02x", id);
975 DPRINTK("smu_get_sdb_partition(%02x)\n", id);
979 rc = mutex_lock_interruptible(&smu_part_access);
983 mutex_lock(&smu_part_access);
985 part = (struct smu_sdbp_header *)get_property(smu->of_node,
988 DPRINTK("trying to extract from SMU ...\n");
989 part = smu_create_sdb_partition(id);
990 if (part != NULL && size)
991 *size = part->len << 2;
993 mutex_unlock(&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);