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Received: from localhost.localdomain (203-57-215-8.dyn.iinet.net.au [203.57.215.8]) by mail.messagingengine.com (Postfix) with ESMTPA; Mon, 10 May 2021 02:50:55 -0400 (EDT) From: Andrew Jeffery To: joel@jms.id.au Subject: [PATCH linux dev-5.10 v3 11/18] ipmi: kcs_bmc: Add serio adaptor Date: Mon, 10 May 2021 16:19:48 +0930 Message-Id: <20210510064955.1704652-12-andrew@aj.id.au> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210510064955.1704652-1-andrew@aj.id.au> References: <20210510064955.1704652-1-andrew@aj.id.au> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: openbmc@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Development list for OpenBMC List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: openbmc@lists.ozlabs.org Errors-To: openbmc-bounces+openbmc=archiver.kernel.org@lists.ozlabs.org Sender: "openbmc" kcs_bmc_serio acts as a bridge between the KCS drivers in the IPMI subsystem and the existing userspace interfaces available through the serio subsystem. This is useful when userspace would like to make use of the BMC KCS devices for purposes that aren't IPMI. Signed-off-by: Andrew Jeffery --- drivers/char/ipmi/Kconfig | 14 +++ drivers/char/ipmi/Makefile | 1 + drivers/char/ipmi/kcs_bmc_serio.c | 151 ++++++++++++++++++++++++++++++ 3 files changed, 166 insertions(+) create mode 100644 drivers/char/ipmi/kcs_bmc_serio.c diff --git a/drivers/char/ipmi/Kconfig b/drivers/char/ipmi/Kconfig index bc5f81899b62..249b31197eea 100644 --- a/drivers/char/ipmi/Kconfig +++ b/drivers/char/ipmi/Kconfig @@ -137,6 +137,20 @@ config IPMI_KCS_BMC_CDEV_IPMI This support is also available as a module. The module will be called kcs_bmc_cdev_ipmi. +config IPMI_KCS_BMC_SERIO + depends on IPMI_KCS_BMC && SERIO + tristate "SerIO adaptor for BMC KCS devices" + help + Adapts the BMC KCS device for the SerIO subsystem. This allows users + to take advantage of userspace interfaces provided by SerIO where + appropriate. + + Say YES if you wish to expose KCS devices on the BMC via SerIO + interfaces. + + This support is also available as a module. The module will be + called kcs_bmc_serio. + config ASPEED_BT_IPMI_BMC depends on ARCH_ASPEED || COMPILE_TEST depends on REGMAP && REGMAP_MMIO && MFD_SYSCON diff --git a/drivers/char/ipmi/Makefile b/drivers/char/ipmi/Makefile index fcfa676afddb..84f47d18007f 100644 --- a/drivers/char/ipmi/Makefile +++ b/drivers/char/ipmi/Makefile @@ -23,6 +23,7 @@ obj-$(CONFIG_IPMI_POWERNV) += ipmi_powernv.o obj-$(CONFIG_IPMI_WATCHDOG) += ipmi_watchdog.o obj-$(CONFIG_IPMI_POWEROFF) += ipmi_poweroff.o obj-$(CONFIG_IPMI_KCS_BMC) += kcs_bmc.o +obj-$(CONFIG_IPMI_KCS_BMC_SERIO) += kcs_bmc_serio.o obj-$(CONFIG_IPMI_KCS_BMC_CDEV_IPMI) += kcs_bmc_cdev_ipmi.o obj-$(CONFIG_ASPEED_BT_IPMI_BMC) += bt-bmc.o obj-$(CONFIG_ASPEED_KCS_IPMI_BMC) += kcs_bmc_aspeed.o diff --git a/drivers/char/ipmi/kcs_bmc_serio.c b/drivers/char/ipmi/kcs_bmc_serio.c new file mode 100644 index 000000000000..30a2b7ab464b --- /dev/null +++ b/drivers/char/ipmi/kcs_bmc_serio.c @@ -0,0 +1,151 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* Copyright (c) 2021 IBM Corp. */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include "kcs_bmc_client.h" + +struct kcs_bmc_serio { + struct list_head entry; + + struct kcs_bmc_client client; + struct serio *port; + + spinlock_t lock; +}; + +static inline struct kcs_bmc_serio *client_to_kcs_bmc_serio(struct kcs_bmc_client *client) +{ + return container_of(client, struct kcs_bmc_serio, client); +} + +static irqreturn_t kcs_bmc_serio_event(struct kcs_bmc_client *client) +{ + struct kcs_bmc_serio *priv; + u8 handled = IRQ_NONE; + u8 status; + + priv = client_to_kcs_bmc_serio(client); + + spin_lock(&priv->lock); + + status = kcs_bmc_read_status(client->dev); + + if (status & KCS_BMC_STR_IBF) + handled = serio_interrupt(priv->port, kcs_bmc_read_data(client->dev), 0); + + spin_unlock(&priv->lock); + + return handled; +} + +static const struct kcs_bmc_client_ops kcs_bmc_serio_client_ops = { + .event = kcs_bmc_serio_event, +}; + +static int kcs_bmc_serio_open(struct serio *port) +{ + struct kcs_bmc_serio *priv = port->port_data; + + return kcs_bmc_enable_device(priv->client.dev, &priv->client); +} + +static void kcs_bmc_serio_close(struct serio *port) +{ + struct kcs_bmc_serio *priv = port->port_data; + + kcs_bmc_disable_device(priv->client.dev, &priv->client); +} + +static DEFINE_SPINLOCK(kcs_bmc_serio_instances_lock); +static LIST_HEAD(kcs_bmc_serio_instances); + +static int kcs_bmc_serio_add_device(struct kcs_bmc_device *kcs_bmc) +{ + struct kcs_bmc_serio *priv; + struct serio *port; + + priv = devm_kzalloc(kcs_bmc->dev, sizeof(*priv), GFP_KERNEL); + port = kzalloc(sizeof(*port), GFP_KERNEL); + if (!(priv && port)) + return -ENOMEM; + + port->id.type = SERIO_8042; + port->open = kcs_bmc_serio_open; + port->close = kcs_bmc_serio_close; + port->port_data = priv; + port->dev.parent = kcs_bmc->dev; + + spin_lock_init(&priv->lock); + priv->port = port; + priv->client.dev = kcs_bmc; + priv->client.ops = &kcs_bmc_serio_client_ops; + + spin_lock_irq(&kcs_bmc_serio_instances_lock); + list_add(&priv->entry, &kcs_bmc_serio_instances); + spin_unlock_irq(&kcs_bmc_serio_instances_lock); + + serio_register_port(port); + + dev_info(kcs_bmc->dev, "Initialised serio client for channel %d", kcs_bmc->channel); + + return 0; +} + +static int kcs_bmc_serio_remove_device(struct kcs_bmc_device *kcs_bmc) +{ + struct kcs_bmc_serio *priv = NULL, *pos; + + spin_lock_irq(&kcs_bmc_serio_instances_lock); + list_for_each_entry(pos, &kcs_bmc_serio_instances, entry) { + if (pos->client.dev == kcs_bmc) { + priv = pos; + list_del(&pos->entry); + break; + } + } + spin_unlock_irq(&kcs_bmc_serio_instances_lock); + + if (!priv) + return -ENODEV; + + serio_unregister_port(priv->port); + kcs_bmc_disable_device(kcs_bmc, &priv->client); + devm_kfree(priv->client.dev->dev, priv); + + return 0; +} + +static const struct kcs_bmc_driver_ops kcs_bmc_serio_driver_ops = { + .add_device = kcs_bmc_serio_add_device, + .remove_device = kcs_bmc_serio_remove_device, +}; + +static struct kcs_bmc_driver kcs_bmc_serio_driver = { + .ops = &kcs_bmc_serio_driver_ops, +}; + +static int kcs_bmc_serio_init(void) +{ + kcs_bmc_register_driver(&kcs_bmc_serio_driver); + + return 0; +} +module_init(kcs_bmc_serio_init); + +static void kcs_bmc_serio_exit(void) +{ + kcs_bmc_unregister_driver(&kcs_bmc_serio_driver); +} +module_exit(kcs_bmc_serio_exit); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Andrew Jeffery "); +MODULE_DESCRIPTION("Adapter driver for serio access to BMC KCS devices"); -- 2.27.0