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;
500 smu->db_irq = irq_of_parse_and_map(np, 0);
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);
517 smu->msg_irq = irq_of_parse_and_map(np, 0);
521 /* Doorbell buffer is currently hard-coded, I didn't find a proper
522 * device-tree entry giving the address. Best would probably to use
523 * an offset for K2 base though, but let's do it that way for now.
525 smu->db_buf = ioremap(0x8000860c, 0x1000);
526 if (smu->db_buf == NULL) {
527 printk(KERN_ERR "SMU: Can't map doorbell buffer pointer !\n");
531 sys_ctrler = SYS_CTRLER_SMU;
541 static int smu_late_init(void)
546 init_timer(&smu->i2c_timer);
547 smu->i2c_timer.function = smu_i2c_retry;
548 smu->i2c_timer.data = (unsigned long)smu;
551 * Try to request the interrupts
554 if (smu->db_irq != NO_IRQ) {
555 if (request_irq(smu->db_irq, smu_db_intr,
556 IRQF_SHARED, "SMU doorbell", smu) < 0) {
557 printk(KERN_WARNING "SMU: can't "
558 "request interrupt %d\n",
560 smu->db_irq = NO_IRQ;
564 if (smu->msg_irq != NO_IRQ) {
565 if (request_irq(smu->msg_irq, smu_msg_intr,
566 IRQF_SHARED, "SMU message", smu) < 0) {
567 printk(KERN_WARNING "SMU: can't "
568 "request interrupt %d\n",
570 smu->msg_irq = NO_IRQ;
576 /* This has to be before arch_initcall as the low i2c stuff relies on the
577 * above having been done before we reach arch_initcalls
579 core_initcall(smu_late_init);
585 static void smu_expose_childs(void *unused)
587 struct device_node *np;
589 for (np = NULL; (np = of_get_next_child(smu->of_node, np)) != NULL;)
590 if (device_is_compatible(np, "smu-sensors"))
591 of_platform_device_create(np, "smu-sensors",
595 static DECLARE_WORK(smu_expose_childs_work, smu_expose_childs, NULL);
597 static int smu_platform_probe(struct of_device* dev,
598 const struct of_device_id *match)
605 * Ok, we are matched, now expose all i2c busses. We have to defer
606 * that unfortunately or it would deadlock inside the device model
608 schedule_work(&smu_expose_childs_work);
613 static struct of_device_id smu_platform_match[] =
621 static struct of_platform_driver smu_of_platform_driver =
624 .match_table = smu_platform_match,
625 .probe = smu_platform_probe,
628 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 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 = smu->cmd_i2c_cur;
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 = sizeof(cmd->pdata);
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 BUG_ON(cmd != smu->cmd_i2c_cur);
745 mod_timer(&smu->i2c_timer, jiffies + msecs_to_jiffies(5));
749 /* If failure or stage 1, command is complete */
750 if (fail || cmd->stage != 0) {
751 smu_i2c_complete_command(cmd, fail);
755 DPRINTK("SMU: going to stage 1\n");
757 /* Ok, initial command complete, now poll status */
758 scmd->reply_buf = cmd->pdata;
759 scmd->reply_len = sizeof(cmd->pdata);
760 scmd->data_buf = cmd->pdata;
769 int smu_queue_i2c(struct smu_i2c_cmd *cmd)
776 /* Fill most fields of scmd */
777 cmd->scmd.cmd = SMU_CMD_I2C_COMMAND;
778 cmd->scmd.done = smu_i2c_low_completion;
779 cmd->scmd.misc = cmd;
780 cmd->scmd.reply_buf = cmd->pdata;
781 cmd->scmd.reply_len = sizeof(cmd->pdata);
782 cmd->scmd.data_buf = (u8 *)(char *)&cmd->info;
783 cmd->scmd.status = 1;
785 cmd->pdata[0] = 0xff;
789 /* Check transfer type, sanitize some "info" fields
790 * based on transfer type and do more checking
792 cmd->info.caddr = cmd->info.devaddr;
793 cmd->read = cmd->info.devaddr & 0x01;
794 switch(cmd->info.type) {
795 case SMU_I2C_TRANSFER_SIMPLE:
796 memset(&cmd->info.sublen, 0, 4);
798 case SMU_I2C_TRANSFER_COMBINED:
799 cmd->info.devaddr &= 0xfe;
800 case SMU_I2C_TRANSFER_STDSUB:
801 if (cmd->info.sublen > 3)
808 /* Finish setting up command based on transfer direction
811 if (cmd->info.datalen > SMU_I2C_READ_MAX)
813 memset(cmd->info.data, 0xff, cmd->info.datalen);
814 cmd->scmd.data_len = 9;
816 if (cmd->info.datalen > SMU_I2C_WRITE_MAX)
818 cmd->scmd.data_len = 9 + cmd->info.datalen;
821 DPRINTK("SMU: i2c enqueuing command\n");
822 DPRINTK("SMU: %s, len=%d bus=%x addr=%x sub0=%x type=%x\n",
823 cmd->read ? "read" : "write", cmd->info.datalen,
824 cmd->info.bus, cmd->info.caddr,
825 cmd->info.subaddr[0], cmd->info.type);
828 /* Enqueue command in i2c list, and if empty, enqueue also in
831 spin_lock_irqsave(&smu->lock, flags);
832 if (smu->cmd_i2c_cur == NULL) {
833 smu->cmd_i2c_cur = cmd;
834 list_add_tail(&cmd->scmd.link, &smu->cmd_list);
835 if (smu->cmd_cur == NULL)
838 list_add_tail(&cmd->link, &smu->cmd_i2c_list);
839 spin_unlock_irqrestore(&smu->lock, flags);
845 * Handling of "partitions"
848 static int smu_read_datablock(u8 *dest, unsigned int addr, unsigned int len)
850 DECLARE_COMPLETION(comp);
856 /* We currently use a chunk size of 0xe. We could check the
857 * SMU firmware version and use bigger sizes though
862 unsigned int clen = min(len, chunk);
864 cmd.cmd = SMU_CMD_MISC_ee_COMMAND;
866 cmd.data_buf = params;
867 cmd.reply_len = chunk;
868 cmd.reply_buf = dest;
869 cmd.done = smu_done_complete;
871 params[0] = SMU_CMD_MISC_ee_GET_DATABLOCK_REC;
873 *((u32 *)¶ms[2]) = addr;
876 rc = smu_queue_cmd(&cmd);
879 wait_for_completion(&comp);
882 if (cmd.reply_len != clen) {
883 printk(KERN_DEBUG "SMU: short read in "
884 "smu_read_datablock, got: %d, want: %d\n",
885 cmd.reply_len, clen);
895 static struct smu_sdbp_header *smu_create_sdb_partition(int id)
897 DECLARE_COMPLETION(comp);
898 struct smu_simple_cmd cmd;
899 unsigned int addr, len, tlen;
900 struct smu_sdbp_header *hdr;
901 struct property *prop;
903 /* First query the partition info */
904 DPRINTK("SMU: Query partition infos ... (irq=%d)\n", smu->db_irq);
905 smu_queue_simple(&cmd, SMU_CMD_PARTITION_COMMAND, 2,
906 smu_done_complete, &comp,
907 SMU_CMD_PARTITION_LATEST, id);
908 wait_for_completion(&comp);
909 DPRINTK("SMU: done, status: %d, reply_len: %d\n",
910 cmd.cmd.status, cmd.cmd.reply_len);
912 /* Partition doesn't exist (or other error) */
913 if (cmd.cmd.status != 0 || cmd.cmd.reply_len != 6)
916 /* Fetch address and length from reply */
917 addr = *((u16 *)cmd.buffer);
918 len = cmd.buffer[3] << 2;
919 /* Calucluate total length to allocate, including the 17 bytes
920 * for "sdb-partition-XX" that we append at the end of the buffer
922 tlen = sizeof(struct property) + len + 18;
924 prop = kcalloc(tlen, 1, GFP_KERNEL);
927 hdr = (struct smu_sdbp_header *)(prop + 1);
928 prop->name = ((char *)prop) + tlen - 18;
929 sprintf(prop->name, "sdb-partition-%02x", id);
931 prop->value = (unsigned char *)hdr;
934 /* Read the datablock */
935 if (smu_read_datablock((u8 *)hdr, addr, len)) {
936 printk(KERN_DEBUG "SMU: datablock read failed while reading "
937 "partition %02x !\n", id);
941 /* Got it, check a few things and create the property */
943 printk(KERN_DEBUG "SMU: Reading partition %02x and got "
944 "%02x !\n", id, hdr->id);
947 if (prom_add_property(smu->of_node, prop)) {
948 printk(KERN_DEBUG "SMU: Failed creating sdb-partition-%02x "
959 /* Note: Only allowed to return error code in pointers (using ERR_PTR)
960 * when interruptible is 1
962 struct smu_sdbp_header *__smu_get_sdb_partition(int id, unsigned int *size,
966 struct smu_sdbp_header *part;
971 sprintf(pname, "sdb-partition-%02x", id);
973 DPRINTK("smu_get_sdb_partition(%02x)\n", id);
977 rc = mutex_lock_interruptible(&smu_part_access);
981 mutex_lock(&smu_part_access);
983 part = (struct smu_sdbp_header *)get_property(smu->of_node,
986 DPRINTK("trying to extract from SMU ...\n");
987 part = smu_create_sdb_partition(id);
988 if (part != NULL && size)
989 *size = part->len << 2;
991 mutex_unlock(&smu_part_access);
995 struct smu_sdbp_header *smu_get_sdb_partition(int id, unsigned int *size)
997 return __smu_get_sdb_partition(id, size, 0);
999 EXPORT_SYMBOL(smu_get_sdb_partition);
1003 * Userland driver interface
1007 static LIST_HEAD(smu_clist);
1008 static DEFINE_SPINLOCK(smu_clist_lock);
1010 enum smu_file_mode {
1018 struct list_head list;
1019 enum smu_file_mode mode;
1023 wait_queue_head_t wait;
1024 u8 buffer[SMU_MAX_DATA];
1028 static int smu_open(struct inode *inode, struct file *file)
1030 struct smu_private *pp;
1031 unsigned long flags;
1033 pp = kmalloc(sizeof(struct smu_private), GFP_KERNEL);
1036 memset(pp, 0, sizeof(struct smu_private));
1037 spin_lock_init(&pp->lock);
1038 pp->mode = smu_file_commands;
1039 init_waitqueue_head(&pp->wait);
1041 spin_lock_irqsave(&smu_clist_lock, flags);
1042 list_add(&pp->list, &smu_clist);
1043 spin_unlock_irqrestore(&smu_clist_lock, flags);
1044 file->private_data = pp;
1050 static void smu_user_cmd_done(struct smu_cmd *cmd, void *misc)
1052 struct smu_private *pp = misc;
1054 wake_up_all(&pp->wait);
1058 static ssize_t smu_write(struct file *file, const char __user *buf,
1059 size_t count, loff_t *ppos)
1061 struct smu_private *pp = file->private_data;
1062 unsigned long flags;
1063 struct smu_user_cmd_hdr hdr;
1068 else if (copy_from_user(&hdr, buf, sizeof(hdr)))
1070 else if (hdr.cmdtype == SMU_CMDTYPE_WANTS_EVENTS) {
1071 pp->mode = smu_file_events;
1073 } else if (hdr.cmdtype == SMU_CMDTYPE_GET_PARTITION) {
1074 struct smu_sdbp_header *part;
1075 part = __smu_get_sdb_partition(hdr.cmd, NULL, 1);
1078 else if (IS_ERR(part))
1079 return PTR_ERR(part);
1081 } else if (hdr.cmdtype != SMU_CMDTYPE_SMU)
1083 else if (pp->mode != smu_file_commands)
1085 else if (hdr.data_len > SMU_MAX_DATA)
1088 spin_lock_irqsave(&pp->lock, flags);
1090 spin_unlock_irqrestore(&pp->lock, flags);
1095 spin_unlock_irqrestore(&pp->lock, flags);
1097 if (copy_from_user(pp->buffer, buf + sizeof(hdr), hdr.data_len)) {
1102 pp->cmd.cmd = hdr.cmd;
1103 pp->cmd.data_len = hdr.data_len;
1104 pp->cmd.reply_len = SMU_MAX_DATA;
1105 pp->cmd.data_buf = pp->buffer;
1106 pp->cmd.reply_buf = pp->buffer;
1107 pp->cmd.done = smu_user_cmd_done;
1109 rc = smu_queue_cmd(&pp->cmd);
1116 static ssize_t smu_read_command(struct file *file, struct smu_private *pp,
1117 char __user *buf, size_t count)
1119 DECLARE_WAITQUEUE(wait, current);
1120 struct smu_user_reply_hdr hdr;
1121 unsigned long flags;
1126 if (count < sizeof(struct smu_user_reply_hdr))
1128 spin_lock_irqsave(&pp->lock, flags);
1129 if (pp->cmd.status == 1) {
1130 if (file->f_flags & O_NONBLOCK)
1132 add_wait_queue(&pp->wait, &wait);
1134 set_current_state(TASK_INTERRUPTIBLE);
1136 if (pp->cmd.status != 1)
1139 if (signal_pending(current))
1141 spin_unlock_irqrestore(&pp->lock, flags);
1143 spin_lock_irqsave(&pp->lock, flags);
1145 set_current_state(TASK_RUNNING);
1146 remove_wait_queue(&pp->wait, &wait);
1148 spin_unlock_irqrestore(&pp->lock, flags);
1151 if (pp->cmd.status != 0)
1152 pp->cmd.reply_len = 0;
1153 size = sizeof(hdr) + pp->cmd.reply_len;
1157 hdr.status = pp->cmd.status;
1158 hdr.reply_len = pp->cmd.reply_len;
1159 if (copy_to_user(buf, &hdr, sizeof(hdr)))
1161 size -= sizeof(hdr);
1162 if (size && copy_to_user(buf + sizeof(hdr), pp->buffer, size))
1170 static ssize_t smu_read_events(struct file *file, struct smu_private *pp,
1171 char __user *buf, size_t count)
1173 /* Not implemented */
1174 msleep_interruptible(1000);
1179 static ssize_t smu_read(struct file *file, char __user *buf,
1180 size_t count, loff_t *ppos)
1182 struct smu_private *pp = file->private_data;
1184 if (pp->mode == smu_file_commands)
1185 return smu_read_command(file, pp, buf, count);
1186 if (pp->mode == smu_file_events)
1187 return smu_read_events(file, pp, buf, count);
1192 static unsigned int smu_fpoll(struct file *file, poll_table *wait)
1194 struct smu_private *pp = file->private_data;
1195 unsigned int mask = 0;
1196 unsigned long flags;
1201 if (pp->mode == smu_file_commands) {
1202 poll_wait(file, &pp->wait, wait);
1204 spin_lock_irqsave(&pp->lock, flags);
1205 if (pp->busy && pp->cmd.status != 1)
1207 spin_unlock_irqrestore(&pp->lock, flags);
1208 } if (pp->mode == smu_file_events) {
1209 /* Not yet implemented */
1214 static int smu_release(struct inode *inode, struct file *file)
1216 struct smu_private *pp = file->private_data;
1217 unsigned long flags;
1223 file->private_data = NULL;
1225 /* Mark file as closing to avoid races with new request */
1226 spin_lock_irqsave(&pp->lock, flags);
1227 pp->mode = smu_file_closing;
1230 /* Wait for any pending request to complete */
1231 if (busy && pp->cmd.status == 1) {
1232 DECLARE_WAITQUEUE(wait, current);
1234 add_wait_queue(&pp->wait, &wait);
1236 set_current_state(TASK_UNINTERRUPTIBLE);
1237 if (pp->cmd.status != 1)
1239 spin_lock_irqsave(&pp->lock, flags);
1241 spin_unlock_irqrestore(&pp->lock, flags);
1243 set_current_state(TASK_RUNNING);
1244 remove_wait_queue(&pp->wait, &wait);
1246 spin_unlock_irqrestore(&pp->lock, flags);
1248 spin_lock_irqsave(&smu_clist_lock, flags);
1249 list_del(&pp->list);
1250 spin_unlock_irqrestore(&smu_clist_lock, flags);
1257 static struct file_operations smu_device_fops = {
1258 .llseek = no_llseek,
1263 .release = smu_release,
1266 static struct miscdevice pmu_device = {
1267 MISC_DYNAMIC_MINOR, "smu", &smu_device_fops
1270 static int smu_device_init(void)
1274 if (misc_register(&pmu_device) < 0)
1275 printk(KERN_ERR "via-pmu: cannot register misc device.\n");
1278 device_initcall(smu_device_init);