Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * pmi driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * PMI (Platform Management Interrupt) is a way to communicate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  * with the BMC (Baseboard Management Controller) via interrupts.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  * Unlike IPMI it is bidirectional and has a low latency.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  * Author: Christian Krafft <krafft@de.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/completion.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/workqueue.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/of_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/of_platform.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <asm/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <asm/pmi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <asm/prom.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) struct pmi_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	struct list_head	handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	spinlock_t		handler_spinlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	spinlock_t		pmi_spinlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	struct mutex		msg_mutex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	pmi_message_t		msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	struct completion	*completion;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	struct platform_device	*dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	int			irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	u8 __iomem		*pmi_reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	struct work_struct	work;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) static struct pmi_data *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) static irqreturn_t pmi_irq_handler(int irq, void *dev_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	u8 type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	spin_lock(&data->pmi_spinlock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	type = ioread8(data->pmi_reg + PMI_READ_TYPE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	pr_debug("pmi: got message of type %d\n", type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	if (type & PMI_ACK && !data->completion) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 		printk(KERN_WARNING "pmi: got unexpected ACK message.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 		rc = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 		goto unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	if (data->completion && !(type & PMI_ACK)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 		printk(KERN_WARNING "pmi: expected ACK, but got %d\n", type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		rc = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 		goto unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	data->msg.type = type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	data->msg.data0 = ioread8(data->pmi_reg + PMI_READ_DATA0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	data->msg.data1 = ioread8(data->pmi_reg + PMI_READ_DATA1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	data->msg.data2 = ioread8(data->pmi_reg + PMI_READ_DATA2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	spin_unlock(&data->pmi_spinlock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	if (rc == -EIO) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		rc = IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	if (data->msg.type & PMI_ACK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		complete(data->completion);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		rc = IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	schedule_work(&data->work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	rc = IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) static const struct of_device_id pmi_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	{ .type = "ibm,pmi", .name = "ibm,pmi" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	{ .type = "ibm,pmi" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	{},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) MODULE_DEVICE_TABLE(of, pmi_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) static void pmi_notify_handlers(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	struct pmi_handler *handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	spin_lock(&data->handler_spinlock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	list_for_each_entry(handler, &data->handler, node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 		pr_debug("pmi: notifying handler %p\n", handler);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 		if (handler->type == data->msg.type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 			handler->handle_pmi_message(data->msg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	spin_unlock(&data->handler_spinlock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) static int pmi_of_probe(struct platform_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	struct device_node *np = dev->dev.of_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	if (data) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		printk(KERN_ERR "pmi: driver has already been initialized.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 		rc = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	data = kzalloc(sizeof(struct pmi_data), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	if (!data) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 		printk(KERN_ERR "pmi: could not allocate memory.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 		rc = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	data->pmi_reg = of_iomap(np, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	if (!data->pmi_reg) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		printk(KERN_ERR "pmi: invalid register address.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 		rc = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 		goto error_cleanup_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	INIT_LIST_HEAD(&data->handler);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	mutex_init(&data->msg_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	spin_lock_init(&data->pmi_spinlock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	spin_lock_init(&data->handler_spinlock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	INIT_WORK(&data->work, pmi_notify_handlers);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	data->dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	data->irq = irq_of_parse_and_map(np, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	if (!data->irq) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		printk(KERN_ERR "pmi: invalid interrupt.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 		rc = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 		goto error_cleanup_iomap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	rc = request_irq(data->irq, pmi_irq_handler, 0, "pmi", NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		printk(KERN_ERR "pmi: can't request IRQ %d: returned %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 				data->irq, rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		goto error_cleanup_iomap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	printk(KERN_INFO "pmi: found pmi device at addr %p.\n", data->pmi_reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) error_cleanup_iomap:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	iounmap(data->pmi_reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) error_cleanup_data:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	kfree(data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) static int pmi_of_remove(struct platform_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	struct pmi_handler *handler, *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	free_irq(data->irq, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	iounmap(data->pmi_reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	spin_lock(&data->handler_spinlock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	list_for_each_entry_safe(handler, tmp, &data->handler, node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 		list_del(&handler->node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	spin_unlock(&data->handler_spinlock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	kfree(data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	data = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) static struct platform_driver pmi_of_platform_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	.probe		= pmi_of_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	.remove		= pmi_of_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	.driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 		.name = "pmi",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 		.of_match_table = pmi_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) module_platform_driver(pmi_of_platform_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) int pmi_send_message(pmi_message_t msg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	DECLARE_COMPLETION_ONSTACK(completion);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	if (!data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 		return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	mutex_lock(&data->msg_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	data->msg = msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	pr_debug("pmi_send_message: msg is %08x\n", *(u32*)&msg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	data->completion = &completion;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	spin_lock_irqsave(&data->pmi_spinlock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	iowrite8(msg.data0, data->pmi_reg + PMI_WRITE_DATA0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	iowrite8(msg.data1, data->pmi_reg + PMI_WRITE_DATA1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	iowrite8(msg.data2, data->pmi_reg + PMI_WRITE_DATA2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	iowrite8(msg.type, data->pmi_reg + PMI_WRITE_TYPE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	spin_unlock_irqrestore(&data->pmi_spinlock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	pr_debug("pmi_send_message: wait for completion\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	wait_for_completion_interruptible_timeout(data->completion,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 						  PMI_TIMEOUT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	data->completion = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	mutex_unlock(&data->msg_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) EXPORT_SYMBOL_GPL(pmi_send_message);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) int pmi_register_handler(struct pmi_handler *handler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	if (!data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 		return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	spin_lock(&data->handler_spinlock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	list_add_tail(&handler->node, &data->handler);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	spin_unlock(&data->handler_spinlock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) EXPORT_SYMBOL_GPL(pmi_register_handler);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) void pmi_unregister_handler(struct pmi_handler *handler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	if (!data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	pr_debug("pmi: unregistering handler %p\n", handler);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	spin_lock(&data->handler_spinlock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	list_del(&handler->node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	spin_unlock(&data->handler_spinlock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) EXPORT_SYMBOL_GPL(pmi_unregister_handler);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) MODULE_AUTHOR("Christian Krafft <krafft@de.ibm.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) MODULE_DESCRIPTION("IBM Platform Management Interrupt driver");