drivers/s390/char/raw3270.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * IBM/3270 Driver
   4  *
   5  * Author(s):
   6  *   Original 3270 Code for 2.4 written by Richard Hitt (UTS Global)
   7  *   Rewritten for 2.5 by Martin Schwidefsky <schwidefsky@de.ibm.com>
   8  *     Copyright IBM Corp. 2003, 2009
   9  */
  10
  11 #include <asm/idals.h>
  12 #include <asm/ioctl.h>
  13
  14 /* ioctls for fullscreen 3270 */
  15 #define TUBICMD         _IO('3', 3)     /* set ccw command for fs reads. */
  16 #define TUBOCMD         _IO('3', 4)     /* set ccw command for fs writes. */
  17 #define TUBGETI         _IO('3', 7)     /* get ccw command for fs reads. */
  18 #define TUBGETO         _IO('3', 8)     /* get ccw command for fs writes. */
  19 #define TUBSETMOD       _IO('3',12)     /* FIXME: what does it do ?*/
  20 #define TUBGETMOD       _IO('3',13)     /* FIXME: what does it do ?*/
  21
  22 /* Local Channel Commands */
  23 #define TC_WRITE        0x01            /* Write */
  24 #define TC_RDBUF        0x02            /* Read Buffer */
  25 #define TC_EWRITE       0x05            /* Erase write */
  26 #define TC_READMOD      0x06            /* Read modified */
  27 #define TC_EWRITEA      0x0d            /* Erase write alternate */
  28 #define TC_WRITESF      0x11            /* Write structured field */
  29
  30 /* Buffer Control Orders */
  31 #define TO_SF           0x1d            /* Start field */
  32 #define TO_SBA          0x11            /* Set buffer address */
  33 #define TO_IC           0x13            /* Insert cursor */
  34 #define TO_PT           0x05            /* Program tab */
  35 #define TO_RA           0x3c            /* Repeat to address */
  36 #define TO_SFE          0x29            /* Start field extended */
  37 #define TO_EUA          0x12            /* Erase unprotected to address */
  38 #define TO_MF           0x2c            /* Modify field */
  39 #define TO_SA           0x28            /* Set attribute */
  40
  41 /* Field Attribute Bytes */
  42 #define TF_INPUT        0x40            /* Visible input */
  43 #define TF_INPUTN       0x4c            /* Invisible input */
  44 #define TF_INMDT        0xc1            /* Visible, Set-MDT */
  45 #define TF_LOG          0x60
  46
  47 /* Character Attribute Bytes */
  48 #define TAT_RESET       0x00
  49 #define TAT_FIELD       0xc0
  50 #define TAT_EXTHI       0x41
  51 #define TAT_COLOR       0x42
  52 #define TAT_CHARS       0x43
  53 #define TAT_TRANS       0x46
  54
  55 /* Extended-Highlighting Bytes */
  56 #define TAX_RESET       0x00
  57 #define TAX_BLINK       0xf1
  58 #define TAX_REVER       0xf2
  59 #define TAX_UNDER       0xf4
  60
  61 /* Reset value */
  62 #define TAR_RESET       0x00
  63
  64 /* Color values */
  65 #define TAC_RESET       0x00
  66 #define TAC_BLUE        0xf1
  67 #define TAC_RED         0xf2
  68 #define TAC_PINK        0xf3
  69 #define TAC_GREEN       0xf4
  70 #define TAC_TURQ        0xf5
  71 #define TAC_YELLOW      0xf6
  72 #define TAC_WHITE       0xf7
  73 #define TAC_DEFAULT     0x00
  74
  75 /* Write Control Characters */
  76 #define TW_NONE         0x40            /* No particular action */
  77 #define TW_KR           0xc2            /* Keyboard restore */
  78 #define TW_PLUSALARM    0x04            /* Add this bit for alarm */
  79
  80 #define RAW3270_FIRSTMINOR      1       /* First minor number */
  81 #define RAW3270_MAXDEVS         255     /* Max number of 3270 devices */
  82
  83 /* For TUBGETMOD and TUBSETMOD. Should include. */
  84 struct raw3270_iocb {
  85         short model;
  86         short line_cnt;
  87         short col_cnt;
  88         short pf_cnt;
  89         short re_cnt;
  90         short map;
  91 };
  92
  93 struct raw3270;
  94 struct raw3270_view;
  95 extern struct class *class3270;
  96
  97 /* 3270 CCW request */
  98 struct raw3270_request {
  99         struct list_head list;          /* list head for request queueing. */
 100         struct raw3270_view *view;      /* view of this request */
 101         struct ccw1 ccw;                /* single ccw. */
 102         void *buffer;                   /* output buffer. */
 103         size_t size;                    /* size of output buffer. */
 104         int rescnt;                     /* residual count from devstat. */
 105         int rc;                         /* return code for this request. */
 106
 107         /* Callback for delivering final status. */
 108         void (*callback)(struct raw3270_request *, void *);
 109         void *callback_data;
 110 };
 111
 112 struct raw3270_request *raw3270_request_alloc(size_t size);
 113 struct raw3270_request *raw3270_request_alloc_bootmem(size_t size);
 114 void raw3270_request_free(struct raw3270_request *);
 115 void raw3270_request_reset(struct raw3270_request *);
 116 void raw3270_request_set_cmd(struct raw3270_request *, u8 cmd);
 117 int  raw3270_request_add_data(struct raw3270_request *, void *, size_t);
 118 void raw3270_request_set_data(struct raw3270_request *, void *, size_t);
 119 void raw3270_request_set_idal(struct raw3270_request *, struct idal_buffer *);
 120
 121 static inline int
 122 raw3270_request_final(struct raw3270_request *rq)
 123 {
 124         return list_empty(&rq->list);
 125 }
 126
 127 void raw3270_buffer_address(struct raw3270 *, char *, unsigned short);
 128
 129 /*
 130  * Functions of a 3270 view.
 131  */
 132 struct raw3270_fn {
 133         int  (*activate)(struct raw3270_view *);
 134         void (*deactivate)(struct raw3270_view *);
 135         void (*intv)(struct raw3270_view *,
 136                      struct raw3270_request *, struct irb *);
 137         void (*release)(struct raw3270_view *);
 138         void (*free)(struct raw3270_view *);
 139         void (*resize)(struct raw3270_view *, int, int, int);
 140 };
 141
 142 /*
 143  * View structure chaining. The raw3270_view structure is meant to
 144  * be embedded at the start of the real view data structure, e.g.:
 145  *   struct example {
 146  *     struct raw3270_view view;
 147  *     ...
 148  *   };
 149  */
 150 struct raw3270_view {
 151         struct list_head list;
 152         spinlock_t lock;
 153         atomic_t ref_count;
 154         struct raw3270 *dev;
 155         struct raw3270_fn *fn;
 156         unsigned int model;
 157         unsigned int rows, cols;        /* # of rows & colums of the view */
 158         unsigned char *ascebc;          /* ascii -> ebcdic table */
 159 };
 160
 161 int raw3270_add_view(struct raw3270_view *, struct raw3270_fn *, int);
 162 int raw3270_activate_view(struct raw3270_view *);
 163 void raw3270_del_view(struct raw3270_view *);
 164 void raw3270_deactivate_view(struct raw3270_view *);
 165 struct raw3270_view *raw3270_find_view(struct raw3270_fn *, int);
 166 int raw3270_start(struct raw3270_view *, struct raw3270_request *);
 167 int raw3270_start_locked(struct raw3270_view *, struct raw3270_request *);
 168 int raw3270_start_irq(struct raw3270_view *, struct raw3270_request *);
 169 int raw3270_reset(struct raw3270_view *);
 170 struct raw3270_view *raw3270_view(struct raw3270_view *);
 171 int raw3270_view_active(struct raw3270_view *);
 172
 173 /* Reference count inliner for view structures. */
 174 static inline void
 175 raw3270_get_view(struct raw3270_view *view)
 176 {
 177         atomic_inc(&view->ref_count);
 178 }
 179
 180 extern wait_queue_head_t raw3270_wait_queue;
 181
 182 static inline void
 183 raw3270_put_view(struct raw3270_view *view)
 184 {
 185         if (atomic_dec_return(&view->ref_count) == 0)
 186                 wake_up(&raw3270_wait_queue);
 187 }
 188
 189 struct raw3270 *raw3270_setup_console(void);
 190 void raw3270_wait_cons_dev(struct raw3270 *);
 191
 192 /* Notifier for device addition/removal */
 193 struct raw3270_notifier {
 194         struct list_head list;
 195         void (*create)(int minor);
 196         void (*destroy)(int minor);
 197 };
 198
 199 int raw3270_register_notifier(struct raw3270_notifier *);
 200 void raw3270_unregister_notifier(struct raw3270_notifier *);
 201 void raw3270_pm_unfreeze(struct raw3270_view *);
 202
 203 /*
 204  * Little memory allocator for string objects.
 205  */
 206 struct string
 207 {
 208         struct list_head list;
 209         struct list_head update;
 210         unsigned long size;
 211         unsigned long len;
 212         char string[0];
 213 } __attribute__ ((aligned(8)));
 214
 215 static inline struct string *
 216 alloc_string(struct list_head *free_list, unsigned long len)
 217 {
 218         struct string *cs, *tmp;
 219         unsigned long size;
 220
 221         size = (len + 7L) & -8L;
 222         list_for_each_entry(cs, free_list, list) {
 223                 if (cs->size < size)
 224                         continue;
 225                 if (cs->size > size + sizeof(struct string)) {
 226                         char *endaddr = (char *) (cs + 1) + cs->size;
 227                         tmp = (struct string *) (endaddr - size) - 1;
 228                         tmp->size = size;
 229                         cs->size -= size + sizeof(struct string);
 230                         cs = tmp;
 231                 } else
 232                         list_del(&cs->list);
 233                 cs->len = len;
 234                 INIT_LIST_HEAD(&cs->list);
 235                 INIT_LIST_HEAD(&cs->update);
 236                 return cs;
 237         }
 238         return NULL;
 239 }
 240
 241 static inline unsigned long
 242 free_string(struct list_head *free_list, struct string *cs)
 243 {
 244         struct string *tmp;
 245         struct list_head *p, *left;
 246
 247         /* Find out the left neighbour in free memory list. */
 248         left = free_list;
 249         list_for_each(p, free_list) {
 250                 if (list_entry(p, struct string, list) > cs)
 251                         break;
 252                 left = p;
 253         }
 254         /* Try to merge with right neighbour = next element from left. */
 255         if (left->next != free_list) {
 256                 tmp = list_entry(left->next, struct string, list);
 257                 if ((char *) (cs + 1) + cs->size == (char *) tmp) {
 258                         list_del(&tmp->list);
 259                         cs->size += tmp->size + sizeof(struct string);
 260                 }
 261         }
 262         /* Try to merge with left neighbour. */
 263         if (left != free_list) {
 264                 tmp = list_entry(left, struct string, list);
 265                 if ((char *) (tmp + 1) + tmp->size == (char *) cs) {
 266                         tmp->size += cs->size + sizeof(struct string);
 267                         return tmp->size;
 268                 }
 269         }
 270         __list_add(&cs->list, left, left->next);
 271         return cs->size;
 272 }
 273
 274 static inline void
 275 add_string_memory(struct list_head *free_list, void *mem, unsigned long size)
 276 {
 277         struct string *cs;
 278
 279         cs = (struct string *) mem;
 280         cs->size = size - sizeof(struct string);
 281         free_string(free_list, cs);
 282 }
 283