200 lines
6.3 KiB
C
200 lines
6.3 KiB
C
/*
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* linux/drivers/s390/crypto/ap_bus.h
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*
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* Copyright (C) 2006 IBM Corporation
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* Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
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* Martin Schwidefsky <schwidefsky@de.ibm.com>
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* Ralph Wuerthner <rwuerthn@de.ibm.com>
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* Felix Beck <felix.beck@de.ibm.com>
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*
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* Adjunct processor bus header file.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef _AP_BUS_H_
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#define _AP_BUS_H_
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#include <linux/device.h>
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#include <linux/mod_devicetable.h>
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#include <linux/types.h>
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#define AP_DEVICES 64 /* Number of AP devices. */
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#define AP_DOMAINS 16 /* Number of AP domains. */
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#define AP_MAX_RESET 90 /* Maximum number of resets. */
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#define AP_RESET_TIMEOUT (HZ/2) /* Time in ticks for reset timeouts. */
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#define AP_CONFIG_TIME 30 /* Time in seconds between AP bus rescans. */
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#define AP_POLL_TIME 1 /* Time in ticks between receive polls. */
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extern int ap_domain_index;
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/**
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* The ap_qid_t identifier of an ap queue. It contains a
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* 6 bit device index and a 4 bit queue index (domain).
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*/
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typedef unsigned int ap_qid_t;
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#define AP_MKQID(_device,_queue) (((_device) & 63) << 8 | ((_queue) & 15))
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#define AP_QID_DEVICE(_qid) (((_qid) >> 8) & 63)
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#define AP_QID_QUEUE(_qid) ((_qid) & 15)
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/**
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* structy ap_queue_status - Holds the AP queue status.
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* @queue_empty: Shows if queue is empty
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* @replies_waiting: Waiting replies
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* @queue_full: Is 1 if the queue is full
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* @pad: A 4 bit pad
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* @int_enabled: Shows if interrupts are enabled for the AP
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* @response_conde: Holds the 8 bit response code
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* @pad2: A 16 bit pad
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*
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* The ap queue status word is returned by all three AP functions
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* (PQAP, NQAP and DQAP). There's a set of flags in the first
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* byte, followed by a 1 byte response code.
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*/
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struct ap_queue_status {
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unsigned int queue_empty : 1;
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unsigned int replies_waiting : 1;
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unsigned int queue_full : 1;
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unsigned int pad1 : 4;
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unsigned int int_enabled : 1;
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unsigned int response_code : 8;
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unsigned int pad2 : 16;
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};
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#define AP_RESPONSE_NORMAL 0x00
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#define AP_RESPONSE_Q_NOT_AVAIL 0x01
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#define AP_RESPONSE_RESET_IN_PROGRESS 0x02
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#define AP_RESPONSE_DECONFIGURED 0x03
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#define AP_RESPONSE_CHECKSTOPPED 0x04
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#define AP_RESPONSE_BUSY 0x05
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#define AP_RESPONSE_INVALID_ADDRESS 0x06
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#define AP_RESPONSE_OTHERWISE_CHANGED 0x07
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#define AP_RESPONSE_Q_FULL 0x10
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#define AP_RESPONSE_NO_PENDING_REPLY 0x10
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#define AP_RESPONSE_INDEX_TOO_BIG 0x11
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#define AP_RESPONSE_NO_FIRST_PART 0x13
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#define AP_RESPONSE_MESSAGE_TOO_BIG 0x15
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#define AP_RESPONSE_REQ_FAC_NOT_INST 0x16
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/*
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* Known device types
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*/
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#define AP_DEVICE_TYPE_PCICC 3
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#define AP_DEVICE_TYPE_PCICA 4
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#define AP_DEVICE_TYPE_PCIXCC 5
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#define AP_DEVICE_TYPE_CEX2A 6
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#define AP_DEVICE_TYPE_CEX2C 7
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#define AP_DEVICE_TYPE_CEX3A 8
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#define AP_DEVICE_TYPE_CEX3C 9
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/*
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* AP reset flag states
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*/
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#define AP_RESET_IGNORE 0 /* request timeout will be ignored */
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#define AP_RESET_ARMED 1 /* request timeout timer is active */
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#define AP_RESET_DO 2 /* AP reset required */
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struct ap_device;
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struct ap_message;
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struct ap_driver {
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struct device_driver driver;
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struct ap_device_id *ids;
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int (*probe)(struct ap_device *);
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void (*remove)(struct ap_device *);
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/* receive is called from tasklet context */
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void (*receive)(struct ap_device *, struct ap_message *,
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struct ap_message *);
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int request_timeout; /* request timeout in jiffies */
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};
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#define to_ap_drv(x) container_of((x), struct ap_driver, driver)
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int ap_driver_register(struct ap_driver *, struct module *, char *);
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void ap_driver_unregister(struct ap_driver *);
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struct ap_device {
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struct device device;
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struct ap_driver *drv; /* Pointer to AP device driver. */
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spinlock_t lock; /* Per device lock. */
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struct list_head list; /* private list of all AP devices. */
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ap_qid_t qid; /* AP queue id. */
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int queue_depth; /* AP queue depth.*/
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int device_type; /* AP device type. */
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int unregistered; /* marks AP device as unregistered */
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struct timer_list timeout; /* Timer for request timeouts. */
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int reset; /* Reset required after req. timeout. */
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int queue_count; /* # messages currently on AP queue. */
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struct list_head pendingq; /* List of message sent to AP queue. */
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int pendingq_count; /* # requests on pendingq list. */
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struct list_head requestq; /* List of message yet to be sent. */
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int requestq_count; /* # requests on requestq list. */
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int total_request_count; /* # requests ever for this AP device. */
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struct ap_message *reply; /* Per device reply message. */
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void *private; /* ap driver private pointer. */
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};
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#define to_ap_dev(x) container_of((x), struct ap_device, device)
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struct ap_message {
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struct list_head list; /* Request queueing. */
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unsigned long long psmid; /* Message id. */
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void *message; /* Pointer to message buffer. */
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size_t length; /* Message length. */
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void *private; /* ap driver private pointer. */
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unsigned int special:1; /* Used for special commands. */
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};
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#define AP_DEVICE(dt) \
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.dev_type=(dt), \
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.match_flags=AP_DEVICE_ID_MATCH_DEVICE_TYPE,
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/**
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* ap_init_message() - Initialize ap_message.
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* Initialize a message before using. Otherwise this might result in
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* unexpected behaviour.
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*/
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static inline void ap_init_message(struct ap_message *ap_msg)
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{
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ap_msg->psmid = 0;
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ap_msg->length = 0;
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ap_msg->special = 0;
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}
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/*
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* Note: don't use ap_send/ap_recv after using ap_queue_message
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* for the first time. Otherwise the ap message queue will get
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* confused.
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*/
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int ap_send(ap_qid_t, unsigned long long, void *, size_t);
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int ap_recv(ap_qid_t, unsigned long long *, void *, size_t);
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void ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_msg);
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void ap_cancel_message(struct ap_device *ap_dev, struct ap_message *ap_msg);
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void ap_flush_queue(struct ap_device *ap_dev);
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int ap_module_init(void);
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void ap_module_exit(void);
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#endif /* _AP_BUS_H_ */
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