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 #define RAW3270_VIEW_LOCK_IRQ 0 154 #define RAW3270_VIEW_LOCK_BH 1 155 atomic_t ref_count; 156 struct raw3270 *dev; 157 struct raw3270_fn *fn; 158 unsigned int model; 159 unsigned int rows, cols; /* # of rows & colums of the view */ 160 unsigned char *ascebc; /* ascii -> ebcdic table */ 161 }; 162 163 int raw3270_add_view(struct raw3270_view *, struct raw3270_fn *, int, int); 164 int raw3270_activate_view(struct raw3270_view *); 165 void raw3270_del_view(struct raw3270_view *); 166 void raw3270_deactivate_view(struct raw3270_view *); 167 struct raw3270_view *raw3270_find_view(struct raw3270_fn *, int); 168 int raw3270_start(struct raw3270_view *, struct raw3270_request *); 169 int raw3270_start_locked(struct raw3270_view *, struct raw3270_request *); 170 int raw3270_start_irq(struct raw3270_view *, struct raw3270_request *); 171 int raw3270_reset(struct raw3270_view *); 172 struct raw3270_view *raw3270_view(struct raw3270_view *); 173 int raw3270_view_active(struct raw3270_view *); 174 175 /* Reference count inliner for view structures. */ 176 static inline void 177 raw3270_get_view(struct raw3270_view *view) 178 { 179 atomic_inc(&view->ref_count); 180 } 181 182 extern wait_queue_head_t raw3270_wait_queue; 183 184 static inline void 185 raw3270_put_view(struct raw3270_view *view) 186 { 187 if (atomic_dec_return(&view->ref_count) == 0) 188 wake_up(&raw3270_wait_queue); 189 } 190 191 struct raw3270 *raw3270_setup_console(void); 192 void raw3270_wait_cons_dev(struct raw3270 *); 193 194 /* Notifier for device addition/removal */ 195 struct raw3270_notifier { 196 struct list_head list; 197 void (*create)(int minor); 198 void (*destroy)(int minor); 199 }; 200 201 int raw3270_register_notifier(struct raw3270_notifier *); 202 void raw3270_unregister_notifier(struct raw3270_notifier *); 203 void raw3270_pm_unfreeze(struct raw3270_view *); 204 205 /* 206 * Little memory allocator for string objects. 207 */ 208 struct string 209 { 210 struct list_head list; 211 struct list_head update; 212 unsigned long size; 213 unsigned long len; 214 char string[0]; 215 } __attribute__ ((aligned(8))); 216 217 static inline struct string * 218 alloc_string(struct list_head *free_list, unsigned long len) 219 { 220 struct string *cs, *tmp; 221 unsigned long size; 222 223 size = (len + 7L) & -8L; 224 list_for_each_entry(cs, free_list, list) { 225 if (cs->size < size) 226 continue; 227 if (cs->size > size + sizeof(struct string)) { 228 char *endaddr = (char *) (cs + 1) + cs->size; 229 tmp = (struct string *) (endaddr - size) - 1; 230 tmp->size = size; 231 cs->size -= size + sizeof(struct string); 232 cs = tmp; 233 } else 234 list_del(&cs->list); 235 cs->len = len; 236 INIT_LIST_HEAD(&cs->list); 237 INIT_LIST_HEAD(&cs->update); 238 return cs; 239 } 240 return NULL; 241 } 242 243 static inline unsigned long 244 free_string(struct list_head *free_list, struct string *cs) 245 { 246 struct string *tmp; 247 struct list_head *p, *left; 248 249 /* Find out the left neighbour in free memory list. */ 250 left = free_list; 251 list_for_each(p, free_list) { 252 if (list_entry(p, struct string, list) > cs) 253 break; 254 left = p; 255 } 256 /* Try to merge with right neighbour = next element from left. */ 257 if (left->next != free_list) { 258 tmp = list_entry(left->next, struct string, list); 259 if ((char *) (cs + 1) + cs->size == (char *) tmp) { 260 list_del(&tmp->list); 261 cs->size += tmp->size + sizeof(struct string); 262 } 263 } 264 /* Try to merge with left neighbour. */ 265 if (left != free_list) { 266 tmp = list_entry(left, struct string, list); 267 if ((char *) (tmp + 1) + tmp->size == (char *) cs) { 268 tmp->size += cs->size + sizeof(struct string); 269 return tmp->size; 270 } 271 } 272 __list_add(&cs->list, left, left->next); 273 return cs->size; 274 } 275 276 static inline void 277 add_string_memory(struct list_head *free_list, void *mem, unsigned long size) 278 { 279 struct string *cs; 280 281 cs = (struct string *) mem; 282 cs->size = size - sizeof(struct string); 283 free_string(free_list, cs); 284 } 285 286