drivers/s390/crypto/ap_bus.h

   1 /*
   2  * linux/drivers/s390/crypto/ap_bus.h
   3  *
   4  * Copyright (C) 2006 IBM Corporation
   5  * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
   6  *            Martin Schwidefsky <schwidefsky@de.ibm.com>
   7  *            Ralph Wuerthner <rwuerthn@de.ibm.com>
   8  *
   9  * Adjunct processor bus header file.
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2, or (at your option)
  14  * any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24  */
  25
  26 #ifndef _AP_BUS_H_
  27 #define _AP_BUS_H_
  28
  29 #include <linux/device.h>
  30 #include <linux/mod_devicetable.h>
  31 #include <linux/types.h>
  32
  33 #define AP_DEVICES 64           /* Number of AP devices. */
  34 #define AP_DOMAINS 16           /* Number of AP domains. */
  35 #define AP_MAX_RESET 90         /* Maximum number of resets. */
  36 #define AP_RESET_TIMEOUT (HZ/2) /* Time in ticks for reset timeouts. */
  37 #define AP_CONFIG_TIME 30       /* Time in seconds between AP bus rescans. */
  38 #define AP_POLL_TIME 1          /* Time in ticks between receive polls. */
  39
  40 extern int ap_domain_index;
  41
  42 /**
  43  * The ap_qid_t identifier of an ap queue. It contains a
  44  * 6 bit device index and a 4 bit queue index (domain).
  45  */
  46 typedef unsigned int ap_qid_t;
  47
  48 #define AP_MKQID(_device,_queue) (((_device) & 63) << 8 | ((_queue) & 15))
  49 #define AP_QID_DEVICE(_qid) (((_qid) >> 8) & 63)
  50 #define AP_QID_QUEUE(_qid) ((_qid) & 15)
  51
  52 /**
  53  * The ap queue status word is returned by all three AP functions
  54  * (PQAP, NQAP and DQAP).  There's a set of flags in the first
  55  * byte, followed by a 1 byte response code.
  56  */
  57 struct ap_queue_status {
  58         unsigned int queue_empty        : 1;
  59         unsigned int replies_waiting    : 1;
  60         unsigned int queue_full         : 1;
  61         unsigned int pad1               : 5;
  62         unsigned int response_code      : 8;
  63         unsigned int pad2               : 16;
  64 };
  65
  66 #define AP_RESPONSE_NORMAL              0x00
  67 #define AP_RESPONSE_Q_NOT_AVAIL         0x01
  68 #define AP_RESPONSE_RESET_IN_PROGRESS   0x02
  69 #define AP_RESPONSE_DECONFIGURED        0x03
  70 #define AP_RESPONSE_CHECKSTOPPED        0x04
  71 #define AP_RESPONSE_BUSY                0x05
  72 #define AP_RESPONSE_Q_FULL              0x10
  73 #define AP_RESPONSE_NO_PENDING_REPLY    0x10
  74 #define AP_RESPONSE_INDEX_TOO_BIG       0x11
  75 #define AP_RESPONSE_NO_FIRST_PART       0x13
  76 #define AP_RESPONSE_MESSAGE_TOO_BIG     0x15
  77
  78 /**
  79  * Known device types
  80  */
  81 #define AP_DEVICE_TYPE_PCICC    3
  82 #define AP_DEVICE_TYPE_PCICA    4
  83 #define AP_DEVICE_TYPE_PCIXCC   5
  84 #define AP_DEVICE_TYPE_CEX2A    6
  85 #define AP_DEVICE_TYPE_CEX2C    7
  86
  87 /**
  88  * AP reset flag states
  89  */
  90 #define AP_RESET_IGNORE 0       /* request timeout will be ignored */
  91 #define AP_RESET_ARMED  1       /* request timeout timer is active */
  92 #define AP_RESET_DO     2       /* AP reset required */
  93
  94 struct ap_device;
  95 struct ap_message;
  96
  97 struct ap_driver {
  98         struct device_driver driver;
  99         struct ap_device_id *ids;
 100
 101         int (*probe)(struct ap_device *);
 102         void (*remove)(struct ap_device *);
 103         /* receive is called from tasklet context */
 104         void (*receive)(struct ap_device *, struct ap_message *,
 105                         struct ap_message *);
 106         int request_timeout;            /* request timeout in jiffies */
 107 };
 108
 109 #define to_ap_drv(x) container_of((x), struct ap_driver, driver)
 110
 111 int ap_driver_register(struct ap_driver *, struct module *, char *);
 112 void ap_driver_unregister(struct ap_driver *);
 113
 114 struct ap_device {
 115         struct device device;
 116         struct ap_driver *drv;          /* Pointer to AP device driver. */
 117         spinlock_t lock;                /* Per device lock. */
 118         struct list_head list;          /* private list of all AP devices. */
 119
 120         ap_qid_t qid;                   /* AP queue id. */
 121         int queue_depth;                /* AP queue depth.*/
 122         int device_type;                /* AP device type. */
 123         int unregistered;               /* marks AP device as unregistered */
 124         struct timer_list timeout;      /* Timer for request timeouts. */
 125         int reset;                      /* Reset required after req. timeout. */
 126
 127         int queue_count;                /* # messages currently on AP queue. */
 128
 129         struct list_head pendingq;      /* List of message sent to AP queue. */
 130         int pendingq_count;             /* # requests on pendingq list. */
 131         struct list_head requestq;      /* List of message yet to be sent. */
 132         int requestq_count;             /* # requests on requestq list. */
 133         int total_request_count;        /* # requests ever for this AP device. */
 134
 135         struct ap_message *reply;       /* Per device reply message. */
 136
 137         void *private;                  /* ap driver private pointer. */
 138 };
 139
 140 #define to_ap_dev(x) container_of((x), struct ap_device, device)
 141
 142 struct ap_message {
 143         struct list_head list;          /* Request queueing. */
 144         unsigned long long psmid;       /* Message id. */
 145         void *message;                  /* Pointer to message buffer. */
 146         size_t length;                  /* Message length. */
 147
 148         void *private;                  /* ap driver private pointer. */
 149 };
 150
 151 #define AP_DEVICE(dt)                                   \
 152         .dev_type=(dt),                                 \
 153         .match_flags=AP_DEVICE_ID_MATCH_DEVICE_TYPE,
 154
 155 /**
 156  * Note: don't use ap_send/ap_recv after using ap_queue_message
 157  * for the first time. Otherwise the ap message queue will get
 158  * confused.
 159  */
 160 int ap_send(ap_qid_t, unsigned long long, void *, size_t);
 161 int ap_recv(ap_qid_t, unsigned long long *, void *, size_t);
 162
 163 void ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_msg);
 164 void ap_cancel_message(struct ap_device *ap_dev, struct ap_message *ap_msg);
 165 void ap_flush_queue(struct ap_device *ap_dev);
 166
 167 int ap_module_init(void);
 168 void ap_module_exit(void);
 169
 170 #endif /* _AP_BUS_H_ */