forked from Minki/linux
1802d0beec
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 655 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070034.575739538@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
90 lines
3.2 KiB
C
90 lines
3.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* FSI master definitions. These comprise the core <--> master interface,
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* to allow the core to interact with the (hardware-specific) masters.
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*
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* Copyright (C) IBM Corporation 2016
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*/
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#ifndef DRIVERS_FSI_MASTER_H
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#define DRIVERS_FSI_MASTER_H
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#include <linux/device.h>
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#include <linux/mutex.h>
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/* Various protocol delays */
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#define FSI_ECHO_DELAY_CLOCKS 16 /* Number clocks for echo delay */
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#define FSI_SEND_DELAY_CLOCKS 16 /* Number clocks for send delay */
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#define FSI_PRE_BREAK_CLOCKS 50 /* Number clocks to prep for break */
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#define FSI_BREAK_CLOCKS 256 /* Number of clocks to issue break */
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#define FSI_POST_BREAK_CLOCKS 16000 /* Number clocks to set up cfam */
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#define FSI_INIT_CLOCKS 5000 /* Clock out any old data */
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#define FSI_MASTER_DPOLL_CLOCKS 50 /* < 21 will cause slave to hang */
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#define FSI_MASTER_EPOLL_CLOCKS 50 /* Number of clocks for E_POLL retry */
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/* Various retry maximums */
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#define FSI_CRC_ERR_RETRIES 10
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#define FSI_MASTER_MAX_BUSY 200
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#define FSI_MASTER_MTOE_COUNT 1000
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/* Command encodings */
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#define FSI_CMD_DPOLL 0x2
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#define FSI_CMD_EPOLL 0x3
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#define FSI_CMD_TERM 0x3f
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#define FSI_CMD_ABS_AR 0x4
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#define FSI_CMD_REL_AR 0x5
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#define FSI_CMD_SAME_AR 0x3 /* but only a 2-bit opcode... */
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/* Slave responses */
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#define FSI_RESP_ACK 0 /* Success */
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#define FSI_RESP_BUSY 1 /* Slave busy */
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#define FSI_RESP_ERRA 2 /* Any (misc) Error */
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#define FSI_RESP_ERRC 3 /* Slave reports master CRC error */
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/* Misc */
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#define FSI_CRC_SIZE 4
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/* fsi-master definition and flags */
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#define FSI_MASTER_FLAG_SWCLOCK 0x1
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struct fsi_master {
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struct device dev;
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int idx;
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int n_links;
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int flags;
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struct mutex scan_lock;
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int (*read)(struct fsi_master *, int link, uint8_t id,
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uint32_t addr, void *val, size_t size);
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int (*write)(struct fsi_master *, int link, uint8_t id,
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uint32_t addr, const void *val, size_t size);
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int (*term)(struct fsi_master *, int link, uint8_t id);
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int (*send_break)(struct fsi_master *, int link);
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int (*link_enable)(struct fsi_master *, int link);
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int (*link_config)(struct fsi_master *, int link,
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u8 t_send_delay, u8 t_echo_delay);
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};
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#define dev_to_fsi_master(d) container_of(d, struct fsi_master, dev)
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/**
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* fsi_master registration & lifetime: the fsi_master_register() and
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* fsi_master_unregister() functions will take ownership of the master, and
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* ->dev in particular. The registration path performs a get_device(), which
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* takes the first reference on the device. Similarly, the unregistration path
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* performs a put_device(), which may well drop the last reference.
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*
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* This means that master implementations *may* need to hold their own
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* reference (via get_device()) on master->dev. In particular, if the device's
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* ->release callback frees the fsi_master, then fsi_master_unregister will
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* invoke this free if no other reference is held.
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*
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* The same applies for the error path of fsi_master_register; if the call
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* fails, dev->release will have been invoked.
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*/
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extern int fsi_master_register(struct fsi_master *master);
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extern void fsi_master_unregister(struct fsi_master *master);
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extern int fsi_master_rescan(struct fsi_master *master);
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#endif /* DRIVERS_FSI_MASTER_H */
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