drivers/s390/crypto/ap_bus.h

   1 /*
   2  * Copyright IBM Corp. 2006, 2012
   3  * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
   4  *            Martin Schwidefsky <schwidefsky@de.ibm.com>
   5  *            Ralph Wuerthner <rwuerthn@de.ibm.com>
   6  *            Felix Beck <felix.beck@de.ibm.com>
   7  *            Holger Dengler <hd@linux.vnet.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  * structy ap_queue_status - Holds the AP queue status.
  54  * @queue_empty: Shows if queue is empty
  55  * @replies_waiting: Waiting replies
  56  * @queue_full: Is 1 if the queue is full
  57  * @pad: A 4 bit pad
  58  * @int_enabled: Shows if interrupts are enabled for the AP
  59  * @response_conde: Holds the 8 bit response code
  60  * @pad2: A 16 bit pad
  61  *
  62  * The ap queue status word is returned by all three AP functions
  63  * (PQAP, NQAP and DQAP).  There's a set of flags in the first
  64  * byte, followed by a 1 byte response code.
  65  */
  66 struct ap_queue_status {
  67         unsigned int queue_empty        : 1;
  68         unsigned int replies_waiting    : 1;
  69         unsigned int queue_full         : 1;
  70         unsigned int pad1               : 4;
  71         unsigned int int_enabled        : 1;
  72         unsigned int response_code      : 8;
  73         unsigned int pad2               : 16;
  74 } __packed;
  75
  76 #define AP_QUEUE_STATUS_INVALID \
  77                 { 1, 1, 1, 0xF, 1, 0xFF, 0xFFFF }
  78
  79 static inline
  80 int ap_queue_status_invalid_test(struct ap_queue_status *status)
  81 {
  82         struct ap_queue_status invalid = AP_QUEUE_STATUS_INVALID;
  83         return !(memcmp(status, &invalid, sizeof(struct ap_queue_status)));
  84 }
  85
  86 #define AP_MAX_BITS 31
  87 static inline int ap_test_bit(unsigned int *ptr, unsigned int nr)
  88 {
  89         if (nr > AP_MAX_BITS)
  90                 return 0;
  91         return (*ptr & (0x80000000u >> nr)) != 0;
  92 }
  93
  94 #define AP_RESPONSE_NORMAL              0x00
  95 #define AP_RESPONSE_Q_NOT_AVAIL         0x01
  96 #define AP_RESPONSE_RESET_IN_PROGRESS   0x02
  97 #define AP_RESPONSE_DECONFIGURED        0x03
  98 #define AP_RESPONSE_CHECKSTOPPED        0x04
  99 #define AP_RESPONSE_BUSY                0x05
 100 #define AP_RESPONSE_INVALID_ADDRESS     0x06
 101 #define AP_RESPONSE_OTHERWISE_CHANGED   0x07
 102 #define AP_RESPONSE_Q_FULL              0x10
 103 #define AP_RESPONSE_NO_PENDING_REPLY    0x10
 104 #define AP_RESPONSE_INDEX_TOO_BIG       0x11
 105 #define AP_RESPONSE_NO_FIRST_PART       0x13
 106 #define AP_RESPONSE_MESSAGE_TOO_BIG     0x15
 107 #define AP_RESPONSE_REQ_FAC_NOT_INST    0x16
 108
 109 /*
 110  * Known device types
 111  */
 112 #define AP_DEVICE_TYPE_PCICC    3
 113 #define AP_DEVICE_TYPE_PCICA    4
 114 #define AP_DEVICE_TYPE_PCIXCC   5
 115 #define AP_DEVICE_TYPE_CEX2A    6
 116 #define AP_DEVICE_TYPE_CEX2C    7
 117 #define AP_DEVICE_TYPE_CEX3A    8
 118 #define AP_DEVICE_TYPE_CEX3C    9
 119 #define AP_DEVICE_TYPE_CEX4     10
 120
 121 /*
 122  * Known function facilities
 123  */
 124 #define AP_FUNC_MEX4K 1
 125 #define AP_FUNC_CRT4K 2
 126 #define AP_FUNC_COPRO 3
 127 #define AP_FUNC_ACCEL 4
 128
 129 /*
 130  * AP reset flag states
 131  */
 132 #define AP_RESET_IGNORE 0       /* request timeout will be ignored */
 133 #define AP_RESET_ARMED  1       /* request timeout timer is active */
 134 #define AP_RESET_DO     2       /* AP reset required */
 135
 136 struct ap_device;
 137 struct ap_message;
 138
 139 struct ap_driver {
 140         struct device_driver driver;
 141         struct ap_device_id *ids;
 142
 143         int (*probe)(struct ap_device *);
 144         void (*remove)(struct ap_device *);
 145         int request_timeout;            /* request timeout in jiffies */
 146 };
 147
 148 #define to_ap_drv(x) container_of((x), struct ap_driver, driver)
 149
 150 int ap_driver_register(struct ap_driver *, struct module *, char *);
 151 void ap_driver_unregister(struct ap_driver *);
 152
 153 struct ap_device {
 154         struct device device;
 155         struct ap_driver *drv;          /* Pointer to AP device driver. */
 156         spinlock_t lock;                /* Per device lock. */
 157         struct list_head list;          /* private list of all AP devices. */
 158
 159         ap_qid_t qid;                   /* AP queue id. */
 160         int queue_depth;                /* AP queue depth.*/
 161         int device_type;                /* AP device type. */
 162         unsigned int functions;         /* AP device function bitfield. */
 163         int unregistered;               /* marks AP device as unregistered */
 164         struct timer_list timeout;      /* Timer for request timeouts. */
 165         int reset;                      /* Reset required after req. timeout. */
 166
 167         int queue_count;                /* # messages currently on AP queue. */
 168
 169         struct list_head pendingq;      /* List of message sent to AP queue. */
 170         int pendingq_count;             /* # requests on pendingq list. */
 171         struct list_head requestq;      /* List of message yet to be sent. */
 172         int requestq_count;             /* # requests on requestq list. */
 173         int total_request_count;        /* # requests ever for this AP device. */
 174
 175         struct ap_message *reply;       /* Per device reply message. */
 176
 177         void *private;                  /* ap driver private pointer. */
 178 };
 179
 180 #define to_ap_dev(x) container_of((x), struct ap_device, device)
 181
 182 struct ap_message {
 183         struct list_head list;          /* Request queueing. */
 184         unsigned long long psmid;       /* Message id. */
 185         void *message;                  /* Pointer to message buffer. */
 186         size_t length;                  /* Message length. */
 187
 188         void *private;                  /* ap driver private pointer. */
 189         unsigned int special:1;         /* Used for special commands. */
 190         /* receive is called from tasklet context */
 191         void (*receive)(struct ap_device *, struct ap_message *,
 192                         struct ap_message *);
 193 };
 194
 195 struct ap_config_info {
 196         unsigned int special_command:1;
 197         unsigned int ap_extended:1;
 198         unsigned char reserved1:6;
 199         unsigned char reserved2[15];
 200         unsigned int apm[8];            /* AP ID mask */
 201         unsigned int aqm[8];            /* AP queue mask */
 202         unsigned int adm[8];            /* AP domain mask */
 203         unsigned char reserved4[16];
 204 } __packed;
 205
 206 #define AP_DEVICE(dt)                                   \
 207         .dev_type=(dt),                                 \
 208         .match_flags=AP_DEVICE_ID_MATCH_DEVICE_TYPE,
 209
 210 /**
 211  * ap_init_message() - Initialize ap_message.
 212  * Initialize a message before using. Otherwise this might result in
 213  * unexpected behaviour.
 214  */
 215 static inline void ap_init_message(struct ap_message *ap_msg)
 216 {
 217         ap_msg->psmid = 0;
 218         ap_msg->length = 0;
 219         ap_msg->special = 0;
 220         ap_msg->receive = NULL;
 221 }
 222
 223 /*
 224  * Note: don't use ap_send/ap_recv after using ap_queue_message
 225  * for the first time. Otherwise the ap message queue will get
 226  * confused.
 227  */
 228 int ap_send(ap_qid_t, unsigned long long, void *, size_t);
 229 int ap_recv(ap_qid_t, unsigned long long *, void *, size_t);
 230
 231 void ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_msg);
 232 void ap_cancel_message(struct ap_device *ap_dev, struct ap_message *ap_msg);
 233 void ap_flush_queue(struct ap_device *ap_dev);
 234 void ap_bus_force_rescan(void);
 235
 236 int ap_module_init(void);
 237 void ap_module_exit(void);
 238
 239 #endif /* _AP_BUS_H_ */