Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 190 insertions, 0 deletions

diff --git a/drivers/char/ipmi/kcs_bmc.c b/drivers/char/ipmi/kcs_bmc.c
new file mode 100644
index 0000000000..8b1161d519
--- /dev/null
+++ b/drivers/char/ipmi/kcs_bmc.c
@@ -0,0 +1,190 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2015-2018, Intel Corporation.
+ * Copyright (c) 2021, IBM Corp.
+ */
+
+#include <linux/device.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+
+#include "kcs_bmc.h"
+
+/* Implement both the device and client interfaces here */
+#include "kcs_bmc_device.h"
+#include "kcs_bmc_client.h"
+
+/* Record registered devices and drivers */
+static DEFINE_MUTEX(kcs_bmc_lock);
+static LIST_HEAD(kcs_bmc_devices);
+static LIST_HEAD(kcs_bmc_drivers);
+
+/* Consumer data access */
+
+u8 kcs_bmc_read_data(struct kcs_bmc_device *kcs_bmc)
+{
+	return kcs_bmc->ops->io_inputb(kcs_bmc, kcs_bmc->ioreg.idr);
+}
+EXPORT_SYMBOL(kcs_bmc_read_data);
+
+void kcs_bmc_write_data(struct kcs_bmc_device *kcs_bmc, u8 data)
+{
+	kcs_bmc->ops->io_outputb(kcs_bmc, kcs_bmc->ioreg.odr, data);
+}
+EXPORT_SYMBOL(kcs_bmc_write_data);
+
+u8 kcs_bmc_read_status(struct kcs_bmc_device *kcs_bmc)
+{
+	return kcs_bmc->ops->io_inputb(kcs_bmc, kcs_bmc->ioreg.str);
+}
+EXPORT_SYMBOL(kcs_bmc_read_status);
+
+void kcs_bmc_write_status(struct kcs_bmc_device *kcs_bmc, u8 data)
+{
+	kcs_bmc->ops->io_outputb(kcs_bmc, kcs_bmc->ioreg.str, data);
+}
+EXPORT_SYMBOL(kcs_bmc_write_status);
+
+void kcs_bmc_update_status(struct kcs_bmc_device *kcs_bmc, u8 mask, u8 val)
+{
+	kcs_bmc->ops->io_updateb(kcs_bmc, kcs_bmc->ioreg.str, mask, val);
+}
+EXPORT_SYMBOL(kcs_bmc_update_status);
+
+irqreturn_t kcs_bmc_handle_event(struct kcs_bmc_device *kcs_bmc)
+{
+	struct kcs_bmc_client *client;
+	irqreturn_t rc = IRQ_NONE;
+	unsigned long flags;
+
+	spin_lock_irqsave(&kcs_bmc->lock, flags);
+	client = kcs_bmc->client;
+	if (client)
+		rc = client->ops->event(client);
+	spin_unlock_irqrestore(&kcs_bmc->lock, flags);
+
+	return rc;
+}
+EXPORT_SYMBOL(kcs_bmc_handle_event);
+
+int kcs_bmc_enable_device(struct kcs_bmc_device *kcs_bmc, struct kcs_bmc_client *client)
+{
+	int rc;
+
+	spin_lock_irq(&kcs_bmc->lock);
+	if (kcs_bmc->client) {
+		rc = -EBUSY;
+	} else {
+		u8 mask = KCS_BMC_EVENT_TYPE_IBF;
+
+		kcs_bmc->client = client;
+		kcs_bmc_update_event_mask(kcs_bmc, mask, mask);
+		rc = 0;
+	}
+	spin_unlock_irq(&kcs_bmc->lock);
+
+	return rc;
+}
+EXPORT_SYMBOL(kcs_bmc_enable_device);
+
+void kcs_bmc_disable_device(struct kcs_bmc_device *kcs_bmc, struct kcs_bmc_client *client)
+{
+	spin_lock_irq(&kcs_bmc->lock);
+	if (client == kcs_bmc->client) {
+		u8 mask = KCS_BMC_EVENT_TYPE_IBF | KCS_BMC_EVENT_TYPE_OBE;
+
+		kcs_bmc_update_event_mask(kcs_bmc, mask, 0);
+		kcs_bmc->client = NULL;
+	}
+	spin_unlock_irq(&kcs_bmc->lock);
+}
+EXPORT_SYMBOL(kcs_bmc_disable_device);
+
+int kcs_bmc_add_device(struct kcs_bmc_device *kcs_bmc)
+{
+	struct kcs_bmc_driver *drv;
+	int error = 0;
+	int rc;
+
+	spin_lock_init(&kcs_bmc->lock);
+	kcs_bmc->client = NULL;
+
+	mutex_lock(&kcs_bmc_lock);
+	list_add(&kcs_bmc->entry, &kcs_bmc_devices);
+	list_for_each_entry(drv, &kcs_bmc_drivers, entry) {
+		rc = drv->ops->add_device(kcs_bmc);
+		if (!rc)
+			continue;
+
+		dev_err(kcs_bmc->dev, "Failed to add chardev for KCS channel %d: %d",
+			kcs_bmc->channel, rc);
+		error = rc;
+	}
+	mutex_unlock(&kcs_bmc_lock);
+
+	return error;
+}
+EXPORT_SYMBOL(kcs_bmc_add_device);
+
+void kcs_bmc_remove_device(struct kcs_bmc_device *kcs_bmc)
+{
+	struct kcs_bmc_driver *drv;
+	int rc;
+
+	mutex_lock(&kcs_bmc_lock);
+	list_del(&kcs_bmc->entry);
+	list_for_each_entry(drv, &kcs_bmc_drivers, entry) {
+		rc = drv->ops->remove_device(kcs_bmc);
+		if (rc)
+			dev_err(kcs_bmc->dev, "Failed to remove chardev for KCS channel %d: %d",
+				kcs_bmc->channel, rc);
+	}
+	mutex_unlock(&kcs_bmc_lock);
+}
+EXPORT_SYMBOL(kcs_bmc_remove_device);
+
+void kcs_bmc_register_driver(struct kcs_bmc_driver *drv)
+{
+	struct kcs_bmc_device *kcs_bmc;
+	int rc;
+
+	mutex_lock(&kcs_bmc_lock);
+	list_add(&drv->entry, &kcs_bmc_drivers);
+	list_for_each_entry(kcs_bmc, &kcs_bmc_devices, entry) {
+		rc = drv->ops->add_device(kcs_bmc);
+		if (rc)
+			dev_err(kcs_bmc->dev, "Failed to add driver for KCS channel %d: %d",
+				kcs_bmc->channel, rc);
+	}
+	mutex_unlock(&kcs_bmc_lock);
+}
+EXPORT_SYMBOL(kcs_bmc_register_driver);
+
+void kcs_bmc_unregister_driver(struct kcs_bmc_driver *drv)
+{
+	struct kcs_bmc_device *kcs_bmc;
+	int rc;
+
+	mutex_lock(&kcs_bmc_lock);
+	list_del(&drv->entry);
+	list_for_each_entry(kcs_bmc, &kcs_bmc_devices, entry) {
+		rc = drv->ops->remove_device(kcs_bmc);
+		if (rc)
+			dev_err(kcs_bmc->dev, "Failed to remove driver for KCS channel %d: %d",
+				kcs_bmc->channel, rc);
+	}
+	mutex_unlock(&kcs_bmc_lock);
+}
+EXPORT_SYMBOL(kcs_bmc_unregister_driver);
+
+void kcs_bmc_update_event_mask(struct kcs_bmc_device *kcs_bmc, u8 mask, u8 events)
+{
+	kcs_bmc->ops->irq_mask_update(kcs_bmc, mask, events);
+}
+EXPORT_SYMBOL(kcs_bmc_update_event_mask);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Haiyue Wang <haiyue.wang@linux.intel.com>");
+MODULE_AUTHOR("Andrew Jeffery <andrew@aj.id.au>");
+MODULE_DESCRIPTION("KCS BMC to handle the IPMI request from system software");