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 256          /* Number of AP domains. */
  35 #define AP_RESET_TIMEOUT (HZ*0.7)       /* Time in ticks for reset timeouts. */
  36 #define AP_CONFIG_TIME 30       /* Time in seconds between AP bus rescans. */
  37 #define AP_POLL_TIME 1          /* Time in ticks between receive polls. */
  38
  39 #define AP_POLL_IMMEDIATELY     1 /* continue running poll tasklet */
  40 #define AP_POLL_AFTER_TIMEOUT   2 /* run poll tasklet again after timout */
  41
  42 extern int ap_domain_index;
  43
  44 /**
  45  * The ap_qid_t identifier of an ap queue. It contains a
  46  * 6 bit device index and a 4 bit queue index (domain).
  47  */
  48 typedef unsigned int ap_qid_t;
  49
  50 #define AP_MKQID(_device, _queue) (((_device) & 63) << 8 | ((_queue) & 255))
  51 #define AP_QID_DEVICE(_qid) (((_qid) >> 8) & 63)
  52 #define AP_QID_QUEUE(_qid) ((_qid) & 255)
  53
  54 /**
  55  * structy ap_queue_status - Holds the AP queue status.
  56  * @queue_empty: Shows if queue is empty
  57  * @replies_waiting: Waiting replies
  58  * @queue_full: Is 1 if the queue is full
  59  * @pad: A 4 bit pad
  60  * @int_enabled: Shows if interrupts are enabled for the AP
  61  * @response_conde: Holds the 8 bit response code
  62  * @pad2: A 16 bit pad
  63  *
  64  * The ap queue status word is returned by all three AP functions
  65  * (PQAP, NQAP and DQAP).  There's a set of flags in the first
  66  * byte, followed by a 1 byte response code.
  67  */
  68 struct ap_queue_status {
  69         unsigned int queue_empty        : 1;
  70         unsigned int replies_waiting    : 1;
  71         unsigned int queue_full         : 1;
  72         unsigned int pad1               : 4;
  73         unsigned int int_enabled        : 1;
  74         unsigned int response_code      : 8;
  75         unsigned int pad2               : 16;
  76 } __packed;
  77
  78 #define AP_QUEUE_STATUS_INVALID \
  79                 { 1, 1, 1, 0xF, 1, 0xFF, 0xFFFF }
  80
  81 static inline
  82 int ap_queue_status_invalid_test(struct ap_queue_status *status)
  83 {
  84         struct ap_queue_status invalid = AP_QUEUE_STATUS_INVALID;
  85         return !(memcmp(status, &invalid, sizeof(struct ap_queue_status)));
  86 }
  87
  88 #define AP_MAX_BITS 31
  89 static inline int ap_test_bit(unsigned int *ptr, unsigned int nr)
  90 {
  91         if (nr > AP_MAX_BITS)
  92                 return 0;
  93         return (*ptr & (0x80000000u >> nr)) != 0;
  94 }
  95
  96 #define AP_RESPONSE_NORMAL              0x00
  97 #define AP_RESPONSE_Q_NOT_AVAIL         0x01
  98 #define AP_RESPONSE_RESET_IN_PROGRESS   0x02
  99 #define AP_RESPONSE_DECONFIGURED        0x03
 100 #define AP_RESPONSE_CHECKSTOPPED        0x04
 101 #define AP_RESPONSE_BUSY                0x05
 102 #define AP_RESPONSE_INVALID_ADDRESS     0x06
 103 #define AP_RESPONSE_OTHERWISE_CHANGED   0x07
 104 #define AP_RESPONSE_Q_FULL              0x10
 105 #define AP_RESPONSE_NO_PENDING_REPLY    0x10
 106 #define AP_RESPONSE_INDEX_TOO_BIG       0x11
 107 #define AP_RESPONSE_NO_FIRST_PART       0x13
 108 #define AP_RESPONSE_MESSAGE_TOO_BIG     0x15
 109 #define AP_RESPONSE_REQ_FAC_NOT_INST    0x16
 110
 111 /*
 112  * Known device types
 113  */
 114 #define AP_DEVICE_TYPE_PCICC    3
 115 #define AP_DEVICE_TYPE_PCICA    4
 116 #define AP_DEVICE_TYPE_PCIXCC   5
 117 #define AP_DEVICE_TYPE_CEX2A    6
 118 #define AP_DEVICE_TYPE_CEX2C    7
 119 #define AP_DEVICE_TYPE_CEX3A    8
 120 #define AP_DEVICE_TYPE_CEX3C    9
 121 #define AP_DEVICE_TYPE_CEX4     10
 122 #define AP_DEVICE_TYPE_CEX5     11
 123
 124 /*
 125  * Known function facilities
 126  */
 127 #define AP_FUNC_MEX4K 1
 128 #define AP_FUNC_CRT4K 2
 129 #define AP_FUNC_COPRO 3
 130 #define AP_FUNC_ACCEL 4
 131 #define AP_FUNC_EP11  5
 132 #define AP_FUNC_APXA  6
 133
 134 /*
 135  * AP reset flag states
 136  */
 137 #define AP_RESET_IGNORE 0       /* request timeout will be ignored */
 138 #define AP_RESET_ARMED  1       /* request timeout timer is active */
 139 #define AP_RESET_DO     2       /* AP reset required */
 140 #define AP_RESET_IN_PROGRESS    3       /* AP reset in progress */
 141
 142 /*
 143  * AP interrupt states
 144  */
 145 #define AP_INTR_DISABLED        0       /* AP interrupt disabled */
 146 #define AP_INTR_ENABLED         1       /* AP interrupt enabled */
 147 #define AP_INTR_IN_PROGRESS     3       /* AP interrupt in progress */
 148
 149 struct ap_device;
 150 struct ap_message;
 151
 152 struct ap_driver {
 153         struct device_driver driver;
 154         struct ap_device_id *ids;
 155
 156         int (*probe)(struct ap_device *);
 157         void (*remove)(struct ap_device *);
 158         int request_timeout;            /* request timeout in jiffies */
 159 };
 160
 161 #define to_ap_drv(x) container_of((x), struct ap_driver, driver)
 162
 163 int ap_driver_register(struct ap_driver *, struct module *, char *);
 164 void ap_driver_unregister(struct ap_driver *);
 165
 166 struct ap_device {
 167         struct device device;
 168         struct ap_driver *drv;          /* Pointer to AP device driver. */
 169         spinlock_t lock;                /* Per device lock. */
 170         struct list_head list;          /* private list of all AP devices. */
 171
 172         ap_qid_t qid;                   /* AP queue id. */
 173         int queue_depth;                /* AP queue depth.*/
 174         int device_type;                /* AP device type. */
 175         int raw_hwtype;                 /* AP raw hardware type. */
 176         unsigned int functions;         /* AP device function bitfield. */
 177         int unregistered;               /* marks AP device as unregistered */
 178         struct timer_list timeout;      /* Timer for request timeouts. */
 179         int reset;                      /* Reset required after req. timeout. */
 180
 181         int interrupt;                  /* indicate if interrupts are enabled */
 182         int queue_count;                /* # messages currently on AP queue. */
 183
 184         struct list_head pendingq;      /* List of message sent to AP queue. */
 185         int pendingq_count;             /* # requests on pendingq list. */
 186         struct list_head requestq;      /* List of message yet to be sent. */
 187         int requestq_count;             /* # requests on requestq list. */
 188         int total_request_count;        /* # requests ever for this AP device. */
 189
 190         struct ap_message *reply;       /* Per device reply message. */
 191
 192         void *private;                  /* ap driver private pointer. */
 193 };
 194
 195 #define to_ap_dev(x) container_of((x), struct ap_device, device)
 196
 197 struct ap_message {
 198         struct list_head list;          /* Request queueing. */
 199         unsigned long long psmid;       /* Message id. */
 200         void *message;                  /* Pointer to message buffer. */
 201         size_t length;                  /* Message length. */
 202
 203         void *private;                  /* ap driver private pointer. */
 204         unsigned int special:1;         /* Used for special commands. */
 205         /* receive is called from tasklet context */
 206         void (*receive)(struct ap_device *, struct ap_message *,
 207                         struct ap_message *);
 208 };
 209
 210 struct ap_config_info {
 211         unsigned int special_command:1;
 212         unsigned int ap_extended:1;
 213         unsigned char reserved1:6;
 214         unsigned char reserved2[15];
 215         unsigned int apm[8];            /* AP ID mask */
 216         unsigned int aqm[8];            /* AP queue mask */
 217         unsigned int adm[8];            /* AP domain mask */
 218         unsigned char reserved4[16];
 219 } __packed;
 220
 221 #define AP_DEVICE(dt)                                   \
 222         .dev_type=(dt),                                 \
 223         .match_flags=AP_DEVICE_ID_MATCH_DEVICE_TYPE,
 224
 225 /**
 226  * ap_init_message() - Initialize ap_message.
 227  * Initialize a message before using. Otherwise this might result in
 228  * unexpected behaviour.
 229  */
 230 static inline void ap_init_message(struct ap_message *ap_msg)
 231 {
 232         ap_msg->psmid = 0;
 233         ap_msg->length = 0;
 234         ap_msg->special = 0;
 235         ap_msg->receive = NULL;
 236 }
 237
 238 /*
 239  * Note: don't use ap_send/ap_recv after using ap_queue_message
 240  * for the first time. Otherwise the ap message queue will get
 241  * confused.
 242  */
 243 int ap_send(ap_qid_t, unsigned long long, void *, size_t);
 244 int ap_recv(ap_qid_t, unsigned long long *, void *, size_t);
 245
 246 void ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_msg);
 247 void ap_cancel_message(struct ap_device *ap_dev, struct ap_message *ap_msg);
 248 void ap_flush_queue(struct ap_device *ap_dev);
 249 void ap_bus_force_rescan(void);
 250
 251 int ap_module_init(void);
 252 void ap_module_exit(void);
 253
 254 #endif /* _AP_BUS_H_ */