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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/char/ipmi/kcs_bmc.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/char/ipmi/kcs_bmc.c')
-rw-r--r--drivers/char/ipmi/kcs_bmc.c190
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");