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28651e6c42
Add a mechanism for controlling whether the client associated with a KCS device will receive Input Buffer Full (IBF) and Output Buffer Empty (OBE) events. This enables an abstract implementation of poll() for KCS devices. A wart in the implementation is that the ASPEED KCS devices don't support an OBE interrupt for the BMC. Instead we pretend it has one by polling the status register waiting for the Output Buffer Full (OBF) bit to clear, and generating an event when OBE is observed. Cc: CS20 KWLiu <KWLIU@nuvoton.com> Signed-off-by: Andrew Jeffery <andrew@aj.id.au> Reviewed-by: Zev Weiss <zweiss@equinix.com> Message-Id: <20210608104757.582199-10-andrew@aj.id.au> Signed-off-by: Corey Minyard <cminyard@mvista.com>
45 lines
1.3 KiB
C
45 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (c) 2021, IBM Corp. */
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#ifndef __KCS_BMC_CONSUMER_H__
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#define __KCS_BMC_CONSUMER_H__
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#include <linux/irqreturn.h>
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#include "kcs_bmc.h"
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struct kcs_bmc_driver_ops {
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int (*add_device)(struct kcs_bmc_device *kcs_bmc);
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int (*remove_device)(struct kcs_bmc_device *kcs_bmc);
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};
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struct kcs_bmc_driver {
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struct list_head entry;
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const struct kcs_bmc_driver_ops *ops;
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};
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struct kcs_bmc_client_ops {
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irqreturn_t (*event)(struct kcs_bmc_client *client);
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};
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struct kcs_bmc_client {
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const struct kcs_bmc_client_ops *ops;
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struct kcs_bmc_device *dev;
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};
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void kcs_bmc_register_driver(struct kcs_bmc_driver *drv);
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void kcs_bmc_unregister_driver(struct kcs_bmc_driver *drv);
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int kcs_bmc_enable_device(struct kcs_bmc_device *kcs_bmc, struct kcs_bmc_client *client);
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void kcs_bmc_disable_device(struct kcs_bmc_device *kcs_bmc, struct kcs_bmc_client *client);
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void kcs_bmc_update_event_mask(struct kcs_bmc_device *kcs_bmc, u8 mask, u8 events);
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u8 kcs_bmc_read_data(struct kcs_bmc_device *kcs_bmc);
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void kcs_bmc_write_data(struct kcs_bmc_device *kcs_bmc, u8 data);
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u8 kcs_bmc_read_status(struct kcs_bmc_device *kcs_bmc);
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void kcs_bmc_write_status(struct kcs_bmc_device *kcs_bmc, u8 data);
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void kcs_bmc_update_status(struct kcs_bmc_device *kcs_bmc, u8 mask, u8 val);
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#endif
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