arch/s390/include/asm/cio.h

   1 /*
   2  *  include/asm-s390/cio.h
   3  *  include/asm-s390x/cio.h
   4  *
   5  * Common interface for I/O on S/390
   6  */
   7 #ifndef _ASM_S390_CIO_H_
   8 #define _ASM_S390_CIO_H_
   9
  10 #include <linux/spinlock.h>
  11 #include <asm/types.h>
  12
  13 #ifdef __KERNEL__
  14
  15 #define LPM_ANYPATH 0xff
  16 #define __MAX_CSSID 0
  17
  18 #include <asm/scsw.h>
  19
  20 /**
  21  * struct ccw1 - channel command word
  22  * @cmd_code: command code
  23  * @flags: flags, like IDA addressing, etc.
  24  * @count: byte count
  25  * @cda: data address
  26  *
  27  * The ccw is the basic structure to build channel programs that perform
  28  * operations with the device or the control unit. Only Format-1 channel
  29  * command words are supported.
  30  */
  31 struct ccw1 {
  32         __u8  cmd_code;
  33         __u8  flags;
  34         __u16 count;
  35         __u32 cda;
  36 } __attribute__ ((packed,aligned(8)));
  37
  38 #define CCW_FLAG_DC             0x80
  39 #define CCW_FLAG_CC             0x40
  40 #define CCW_FLAG_SLI            0x20
  41 #define CCW_FLAG_SKIP           0x10
  42 #define CCW_FLAG_PCI            0x08
  43 #define CCW_FLAG_IDA            0x04
  44 #define CCW_FLAG_SUSPEND        0x02
  45
  46 #define CCW_CMD_READ_IPL        0x02
  47 #define CCW_CMD_NOOP            0x03
  48 #define CCW_CMD_BASIC_SENSE     0x04
  49 #define CCW_CMD_TIC             0x08
  50 #define CCW_CMD_STLCK           0x14
  51 #define CCW_CMD_SENSE_PGID      0x34
  52 #define CCW_CMD_SUSPEND_RECONN  0x5B
  53 #define CCW_CMD_RDC             0x64
  54 #define CCW_CMD_RELEASE         0x94
  55 #define CCW_CMD_SET_PGID        0xAF
  56 #define CCW_CMD_SENSE_ID        0xE4
  57 #define CCW_CMD_DCTL            0xF3
  58
  59 #define SENSE_MAX_COUNT         0x20
  60
  61 /**
  62  * struct erw - extended report word
  63  * @res0: reserved
  64  * @auth: authorization check
  65  * @pvrf: path-verification-required flag
  66  * @cpt: channel-path timeout
  67  * @fsavf: failing storage address validity flag
  68  * @cons: concurrent sense
  69  * @scavf: secondary ccw address validity flag
  70  * @fsaf: failing storage address format
  71  * @scnt: sense count, if @cons == %1
  72  * @res16: reserved
  73  */
  74 struct erw {
  75         __u32 res0  : 3;
  76         __u32 auth  : 1;
  77         __u32 pvrf  : 1;
  78         __u32 cpt   : 1;
  79         __u32 fsavf : 1;
  80         __u32 cons  : 1;
  81         __u32 scavf : 1;
  82         __u32 fsaf  : 1;
  83         __u32 scnt  : 6;
  84         __u32 res16 : 16;
  85 } __attribute__ ((packed));
  86
  87 /**
  88  * struct sublog - subchannel logout area
  89  * @res0: reserved
  90  * @esf: extended status flags
  91  * @lpum: last path used mask
  92  * @arep: ancillary report
  93  * @fvf: field-validity flags
  94  * @sacc: storage access code
  95  * @termc: termination code
  96  * @devsc: device-status check
  97  * @serr: secondary error
  98  * @ioerr: i/o-error alert
  99  * @seqc: sequence code
 100  */
 101 struct sublog {
 102         __u32 res0  : 1;
 103         __u32 esf   : 7;
 104         __u32 lpum  : 8;
 105         __u32 arep  : 1;
 106         __u32 fvf   : 5;
 107         __u32 sacc  : 2;
 108         __u32 termc : 2;
 109         __u32 devsc : 1;
 110         __u32 serr  : 1;
 111         __u32 ioerr : 1;
 112         __u32 seqc  : 3;
 113 } __attribute__ ((packed));
 114
 115 /**
 116  * struct esw0 - Format 0 Extended Status Word (ESW)
 117  * @sublog: subchannel logout
 118  * @erw: extended report word
 119  * @faddr: failing storage address
 120  * @saddr: secondary ccw address
 121  */
 122 struct esw0 {
 123         struct sublog sublog;
 124         struct erw erw;
 125         __u32  faddr[2];
 126         __u32  saddr;
 127 } __attribute__ ((packed));
 128
 129 /**
 130  * struct esw1 - Format 1 Extended Status Word (ESW)
 131  * @zero0: reserved zeros
 132  * @lpum: last path used mask
 133  * @zero16: reserved zeros
 134  * @erw: extended report word
 135  * @zeros: three fullwords of zeros
 136  */
 137 struct esw1 {
 138         __u8  zero0;
 139         __u8  lpum;
 140         __u16 zero16;
 141         struct erw erw;
 142         __u32 zeros[3];
 143 } __attribute__ ((packed));
 144
 145 /**
 146  * struct esw2 - Format 2 Extended Status Word (ESW)
 147  * @zero0: reserved zeros
 148  * @lpum: last path used mask
 149  * @dcti: device-connect-time interval
 150  * @erw: extended report word
 151  * @zeros: three fullwords of zeros
 152  */
 153 struct esw2 {
 154         __u8  zero0;
 155         __u8  lpum;
 156         __u16 dcti;
 157         struct erw erw;
 158         __u32 zeros[3];
 159 } __attribute__ ((packed));
 160
 161 /**
 162  * struct esw3 - Format 3 Extended Status Word (ESW)
 163  * @zero0: reserved zeros
 164  * @lpum: last path used mask
 165  * @res: reserved
 166  * @erw: extended report word
 167  * @zeros: three fullwords of zeros
 168  */
 169 struct esw3 {
 170         __u8  zero0;
 171         __u8  lpum;
 172         __u16 res;
 173         struct erw erw;
 174         __u32 zeros[3];
 175 } __attribute__ ((packed));
 176
 177 /**
 178  * struct irb - interruption response block
 179  * @scsw: subchannel status word
 180  * @esw: extened status word, 4 formats
 181  * @ecw: extended control word
 182  *
 183  * The irb that is handed to the device driver when an interrupt occurs. For
 184  * solicited interrupts, the common I/O layer already performs checks whether
 185  * a field is valid; a field not being valid is always passed as %0.
 186  * If a unit check occurred, @ecw may contain sense data; this is retrieved
 187  * by the common I/O layer itself if the device doesn't support concurrent
 188  * sense (so that the device driver never needs to perform basic sene itself).
 189  * For unsolicited interrupts, the irb is passed as-is (expect for sense data,
 190  * if applicable).
 191  */
 192 struct irb {
 193         union scsw scsw;
 194         union {
 195                 struct esw0 esw0;
 196                 struct esw1 esw1;
 197                 struct esw2 esw2;
 198                 struct esw3 esw3;
 199         } esw;
 200         __u8   ecw[32];
 201 } __attribute__ ((packed,aligned(4)));
 202
 203 /**
 204  * struct ciw - command information word  (CIW) layout
 205  * @et: entry type
 206  * @reserved: reserved bits
 207  * @ct: command type
 208  * @cmd: command code
 209  * @count: command count
 210  */
 211 struct ciw {
 212         __u32 et       :  2;
 213         __u32 reserved :  2;
 214         __u32 ct       :  4;
 215         __u32 cmd      :  8;
 216         __u32 count    : 16;
 217 } __attribute__ ((packed));
 218
 219 #define CIW_TYPE_RCD    0x0     /* read configuration data */
 220 #define CIW_TYPE_SII    0x1     /* set interface identifier */
 221 #define CIW_TYPE_RNI    0x2     /* read node identifier */
 222
 223 /*
 224  * Flags used as input parameters for do_IO()
 225  */
 226 #define DOIO_ALLOW_SUSPEND       0x0001 /* allow for channel prog. suspend */
 227 #define DOIO_DENY_PREFETCH       0x0002 /* don't allow for CCW prefetch */
 228 #define DOIO_SUPPRESS_INTER      0x0004 /* suppress intermediate inter. */
 229                                         /* ... for suspended CCWs */
 230 /* Device or subchannel gone. */
 231 #define CIO_GONE       0x0001
 232 /* No path to device. */
 233 #define CIO_NO_PATH    0x0002
 234 /* Device has appeared. */
 235 #define CIO_OPER       0x0004
 236 /* Sick revalidation of device. */
 237 #define CIO_REVALIDATE 0x0008
 238 /* Device did not respond in time. */
 239 #define CIO_BOXED      0x0010
 240
 241 /**
 242  * struct ccw_dev_id - unique identifier for ccw devices
 243  * @ssid: subchannel set id
 244  * @devno: device number
 245  *
 246  * This structure is not directly based on any hardware structure. The
 247  * hardware identifies a device by its device number and its subchannel,
 248  * which is in turn identified by its id. In order to get a unique identifier
 249  * for ccw devices across subchannel sets, @struct ccw_dev_id has been
 250  * introduced.
 251  */
 252 struct ccw_dev_id {
 253         u8 ssid;
 254         u16 devno;
 255 };
 256
 257 /**
 258  * ccw_device_id_is_equal() - compare two ccw_dev_ids
 259  * @dev_id1: a ccw_dev_id
 260  * @dev_id2: another ccw_dev_id
 261  * Returns:
 262  *  %1 if the two structures are equal field-by-field,
 263  *  %0 if not.
 264  * Context:
 265  *  any
 266  */
 267 static inline int ccw_dev_id_is_equal(struct ccw_dev_id *dev_id1,
 268                                       struct ccw_dev_id *dev_id2)
 269 {
 270         if ((dev_id1->ssid == dev_id2->ssid) &&
 271             (dev_id1->devno == dev_id2->devno))
 272                 return 1;
 273         return 0;
 274 }
 275
 276 extern void wait_cons_dev(void);
 277
 278 extern void css_schedule_reprobe(void);
 279
 280 extern void reipl_ccw_dev(struct ccw_dev_id *id);
 281
 282 struct cio_iplinfo {
 283         u16 devno;
 284         int is_qdio;
 285 };
 286
 287 extern int cio_get_iplinfo(struct cio_iplinfo *iplinfo);
 288
 289 /* Function from drivers/s390/cio/chsc.c */
 290 int chsc_sstpc(void *page, unsigned int op, u16 ctrl);
 291 int chsc_sstpi(void *page, void *result, size_t size);
 292
 293 #endif
 294
 295 #endif