3  * PowerMac G5 SMU driver
15  *  - maybe avoid some data copies with i2c by directly using the smu cmd
17  *  - understand SMU -> CPU events and implement reception of them via
47 #include <asm/smu.h>
63  * This is the command buffer passed to the SMU hardware
95  * I don't think there will ever be more than one SMU, so
99 static struct smu_device	*smu;  variable
107  * SMU driver low level stuff
115 	if (list_empty(&smu->cmd_list))  in smu_start_cmd()
119 	cmd = list_entry(smu->cmd_list.next, struct smu_cmd, link);  in smu_start_cmd()
120 	smu->cmd_cur = cmd;  in smu_start_cmd()
123 	DPRINTK("SMU: starting cmd %x, %d bytes data\n", cmd->cmd,  in smu_start_cmd()
125 	DPRINTK("SMU: data buffer: %8ph\n", cmd->data_buf);  in smu_start_cmd()
127 	/* Fill the SMU command buffer */  in smu_start_cmd()
128 	smu->cmd_buf->cmd = cmd->cmd;  in smu_start_cmd()
129 	smu->cmd_buf->length = cmd->data_len;  in smu_start_cmd()
130 	memcpy(smu->cmd_buf->data, cmd->data_buf, cmd->data_len);  in smu_start_cmd()
133 	faddr = (unsigned long)smu->cmd_buf;  in smu_start_cmd()
134 	fend = faddr + smu->cmd_buf->length + 2;  in smu_start_cmd()
143 	 * whole duration of the command prevents the SMU from fetching it  in smu_start_cmd()
145 	 * mechanism the SMU uses to access memory.  in smu_start_cmd()
147 	if (smu->broken_nap)  in smu_start_cmd()
151 	 * the SMU is actually communicating with us via i2c to the  in smu_start_cmd()
154 	writel(smu->cmd_buf_abs, smu->db_buf);  in smu_start_cmd()
156 	/* Ring the SMU doorbell */  in smu_start_cmd()
157 	pmac_do_feature_call(PMAC_FTR_WRITE_GPIO, NULL, smu->doorbell, 4);  in smu_start_cmd()
170 	/* SMU completed the command, well, we hope, let's make sure  in smu_db_intr()
173 	spin_lock_irqsave(&smu->lock, flags);  in smu_db_intr()
175 	gpio = pmac_do_feature_call(PMAC_FTR_READ_GPIO, NULL, smu->doorbell);  in smu_db_intr()
177 		spin_unlock_irqrestore(&smu->lock, flags);  in smu_db_intr()
181 	cmd = smu->cmd_cur;  in smu_db_intr()
182 	smu->cmd_cur = NULL;  in smu_db_intr()
192 		 * to flush again before peeking at the SMU response. We  in smu_db_intr()
196 		faddr = (unsigned long)smu->cmd_buf;  in smu_db_intr()
201 		if (ack != smu->cmd_buf->cmd) {  in smu_db_intr()
202 			DPRINTK("SMU: incorrect ack, want %x got %x\n",  in smu_db_intr()
203 				ack, smu->cmd_buf->cmd);  in smu_db_intr()
206 		reply_len = rc == 0 ? smu->cmd_buf->length : 0;  in smu_db_intr()
207 		DPRINTK("SMU: reply len: %d\n", reply_len);  in smu_db_intr()
209 			printk(KERN_WARNING "SMU: reply buffer too small,"  in smu_db_intr()
216 			memcpy(cmd->reply_buf, smu->cmd_buf->data, reply_len);  in smu_db_intr()
228 	if (smu->broken_nap)  in smu_db_intr()
233 	spin_unlock_irqrestore(&smu->lock, flags);  in smu_db_intr()
247 	 * receive it, so I suspect we have to arm it someway in the SMU  in smu_msg_intr()
251 	printk(KERN_INFO "SMU: message interrupt !\n");  in smu_msg_intr()
267 	if (smu == NULL)  in smu_queue_cmd()
274 	spin_lock_irqsave(&smu->lock, flags);  in smu_queue_cmd()
275 	list_add_tail(&cmd->link, &smu->cmd_list);  in smu_queue_cmd()
276 	if (smu->cmd_cur == NULL)  in smu_queue_cmd()
278 	spin_unlock_irqrestore(&smu->lock, flags);  in smu_queue_cmd()
281 	if (!smu_irq_inited || !smu->db_irq)  in smu_queue_cmd()
324 	if (smu == NULL)  in smu_poll()
327 	gpio = pmac_do_feature_call(PMAC_FTR_READ_GPIO, NULL, smu->doorbell);  in smu_poll()
329 		smu_db_intr(smu->db_irq, smu);  in smu_poll()
385 	if (smu == NULL)  in smu_get_rtc_time()
412 	if (smu == NULL)  in smu_set_rtc_time()
436 	if (smu == NULL)  in smu_shutdown()
452 	if (smu == NULL)  in smu_restart()
466 	return smu != NULL;  in smu_present()
477         np = of_find_node_by_type(NULL, "smu");  in smu_init()
481 	printk(KERN_INFO "SMU: Driver %s %s\n", VERSION, AUTHOR);  in smu_init()
484 	 * SMU based G5s need some memory below 2Gb. Thankfully this is  in smu_init()
489 		printk(KERN_ERR "SMU: Command buffer allocation failed !\n");  in smu_init()
494 	smu = memblock_alloc(sizeof(struct smu_device), SMP_CACHE_BYTES);  in smu_init()
495 	if (!smu)  in smu_init()
499 	spin_lock_init(&smu->lock);  in smu_init()
500 	INIT_LIST_HEAD(&smu->cmd_list);  in smu_init()
501 	INIT_LIST_HEAD(&smu->cmd_i2c_list);  in smu_init()
502 	smu->of_node = np;  in smu_init()
503 	smu->db_irq = 0;  in smu_init()
504 	smu->msg_irq = 0;  in smu_init()
509 	smu->cmd_buf_abs = (u32)smu_cmdbuf_abs;  in smu_init()
510 	smu->cmd_buf = __va(smu_cmdbuf_abs);  in smu_init()
512 	smu->db_node = of_find_node_by_name(NULL, "smu-doorbell");  in smu_init()
513 	if (smu->db_node == NULL) {  in smu_init()
514 		printk(KERN_ERR "SMU: Can't find doorbell GPIO !\n");  in smu_init()
518 	data = of_get_property(smu->db_node, "reg", NULL);  in smu_init()
520 		printk(KERN_ERR "SMU: Can't find doorbell GPIO address !\n");  in smu_init()
529 	smu->doorbell = *data;  in smu_init()
530 	if (smu->doorbell < 0x50)  in smu_init()
531 		smu->doorbell += 0x50;  in smu_init()
533 	/* Now look for the smu-interrupt GPIO */  in smu_init()
535 		smu->msg_node = of_find_node_by_name(NULL, "smu-interrupt");  in smu_init()
536 		if (smu->msg_node == NULL)  in smu_init()
538 		data = of_get_property(smu->msg_node, "reg", NULL);  in smu_init()
540 			of_node_put(smu->msg_node);  in smu_init()
541 			smu->msg_node = NULL;  in smu_init()
544 		smu->msg = *data;  in smu_init()
545 		if (smu->msg < 0x50)  in smu_init()
546 			smu->msg += 0x50;  in smu_init()
553 	smu->db_buf = ioremap(0x8000860c, 0x1000);  in smu_init()
554 	if (smu->db_buf == NULL) {  in smu_init()
555 		printk(KERN_ERR "SMU: Can't map doorbell buffer pointer !\n");  in smu_init()
560 	/* U3 has an issue with NAP mode when issuing SMU commands */  in smu_init()
561 	smu->broken_nap = pmac_get_uninorth_variant() < 4;  in smu_init()
562 	if (smu->broken_nap)  in smu_init()
563 		printk(KERN_INFO "SMU: using NAP mode workaround\n");  in smu_init()
569 	of_node_put(smu->msg_node);  in smu_init()
571 	of_node_put(smu->db_node);  in smu_init()
573 	memblock_free_ptr(smu, sizeof(struct smu_device));  in smu_init()
574 	smu = NULL;  in smu_init()
583 	if (!smu)  in smu_late_init()
586 	timer_setup(&smu->i2c_timer, smu_i2c_retry, 0);  in smu_late_init()
588 	if (smu->db_node) {  in smu_late_init()
589 		smu->db_irq = irq_of_parse_and_map(smu->db_node, 0);  in smu_late_init()
590 		if (!smu->db_irq)  in smu_late_init()
591 			printk(KERN_ERR "smu: failed to map irq for node %pOF\n",  in smu_late_init()
592 			       smu->db_node);  in smu_late_init()
594 	if (smu->msg_node) {  in smu_late_init()
595 		smu->msg_irq = irq_of_parse_and_map(smu->msg_node, 0);  in smu_late_init()
596 		if (!smu->msg_irq)  in smu_late_init()
597 			printk(KERN_ERR "smu: failed to map irq for node %pOF\n",  in smu_late_init()
598 			       smu->msg_node);  in smu_late_init()
605 	if (smu->db_irq) {  in smu_late_init()
606 		if (request_irq(smu->db_irq, smu_db_intr,  in smu_late_init()
607 				IRQF_SHARED, "SMU doorbell", smu) < 0) {  in smu_late_init()
608 			printk(KERN_WARNING "SMU: can't "  in smu_late_init()
610 			       smu->db_irq);  in smu_late_init()
611 			smu->db_irq = 0;  in smu_late_init()
615 	if (smu->msg_irq) {  in smu_late_init()
616 		if (request_irq(smu->msg_irq, smu_msg_intr,  in smu_late_init()
617 				IRQF_SHARED, "SMU message", smu) < 0) {  in smu_late_init()
618 			printk(KERN_WARNING "SMU: can't "  in smu_late_init()
620 			       smu->msg_irq);  in smu_late_init()
621 			smu->msg_irq = 0;  in smu_late_init()
641 	for_each_child_of_node(smu->of_node, np)  in smu_expose_childs()
642 		if (of_device_is_compatible(np, "smu-sensors"))  in smu_expose_childs()
643 			of_platform_device_create(np, "smu-sensors",  in smu_expose_childs()
644 						  &smu->of_dev->dev);  in smu_expose_childs()
651 	if (!smu)  in smu_platform_probe()
653 	smu->of_dev = dev;  in smu_platform_probe()
667 		.type		= "smu",
675 		.name = "smu",
684 	 * For now, we don't power manage machines with an SMU chip,  in smu_init_sysfs()
696 	if (!smu)  in smu_get_ofdev()
698 	return smu->of_dev;  in smu_get_ofdev()
722 	DPRINTK("SMU: completing, success: %d\n", !fail);  in smu_i2c_complete_command()
728 	spin_lock_irqsave(&smu->lock, flags);  in smu_i2c_complete_command()
729 	smu->cmd_i2c_cur = NULL;  in smu_i2c_complete_command()
734 	if (!list_empty(&smu->cmd_i2c_list)) {  in smu_i2c_complete_command()
738 		newcmd = list_entry(smu->cmd_i2c_list.next,  in smu_i2c_complete_command()
740 		smu->cmd_i2c_cur = newcmd;  in smu_i2c_complete_command()
743 		/* Queue with low level smu */  in smu_i2c_complete_command()
744 		list_add_tail(&cmd->scmd.link, &smu->cmd_list);  in smu_i2c_complete_command()
745 		if (smu->cmd_cur == NULL)  in smu_i2c_complete_command()
748 	spin_unlock_irqrestore(&smu->lock, flags);  in smu_i2c_complete_command()
759 	struct smu_i2c_cmd	*cmd = smu->cmd_i2c_cur;  in smu_i2c_retry()
761 	DPRINTK("SMU: i2c failure, requeuing...\n");  in smu_i2c_retry()
775 	DPRINTK("SMU: i2c compl. stage=%d status=%x pdata[0]=%x rlen: %x\n",  in smu_i2c_low_completion()
793 		DPRINTK("SMU: i2c failure, starting timer...\n");  in smu_i2c_low_completion()
794 		BUG_ON(cmd != smu->cmd_i2c_cur);  in smu_i2c_low_completion()
800 		mod_timer(&smu->i2c_timer, jiffies + msecs_to_jiffies(5));  in smu_i2c_low_completion()
810 	DPRINTK("SMU: going to stage 1\n");  in smu_i2c_low_completion()
828 	if (smu == NULL)  in smu_queue_i2c()
877 	DPRINTK("SMU: i2c enqueuing command\n");  in smu_queue_i2c()
878 	DPRINTK("SMU:   %s, len=%d bus=%x addr=%x sub0=%x type=%x\n",  in smu_queue_i2c()
887 	spin_lock_irqsave(&smu->lock, flags);  in smu_queue_i2c()
888 	if (smu->cmd_i2c_cur == NULL) {  in smu_queue_i2c()
889 		smu->cmd_i2c_cur = cmd;  in smu_queue_i2c()
890 		list_add_tail(&cmd->scmd.link, &smu->cmd_list);  in smu_queue_i2c()
891 		if (smu->cmd_cur == NULL)  in smu_queue_i2c()
894 		list_add_tail(&cmd->link, &smu->cmd_i2c_list);  in smu_queue_i2c()
895 	spin_unlock_irqrestore(&smu->lock, flags);  in smu_queue_i2c()
913 	 * SMU firmware version and use bigger sizes though  in smu_read_datablock()
939 			printk(KERN_DEBUG "SMU: short read in "  in smu_read_datablock()
960 	DPRINTK("SMU: Query partition infos ... (irq=%d)\n", smu->db_irq);  in smu_create_sdb_partition()
965 	DPRINTK("SMU: done, status: %d, reply_len: %d\n",  in smu_create_sdb_partition()
992 		printk(KERN_DEBUG "SMU: datablock read failed while reading "  in smu_create_sdb_partition()
999 		printk(KERN_DEBUG "SMU: Reading partition %02x and got "  in smu_create_sdb_partition()
1003 	if (of_add_property(smu->of_node, prop)) {  in smu_create_sdb_partition()
1004 		printk(KERN_DEBUG "SMU: Failed creating sdb-partition-%02x "  in smu_create_sdb_partition()
1024 	if (!smu)  in __smu_get_sdb_partition()
1039 	part = of_get_property(smu->of_node, pname, size);  in __smu_get_sdb_partition()
1041 		DPRINTK("trying to extract from SMU ...\n");  in __smu_get_sdb_partition()
1326 	MISC_DYNAMIC_MINOR, "smu", &smu_device_fops
1331 	if (!smu)  in smu_device_init()