1 /*
2 * IBM/3270 Driver
3 *
4 * Author(s):
5 * Original 3270 Code for 2.4 written by Richard Hitt (UTS Global)
6 * Rewritten for 2.5 by Martin Schwidefsky <schwidefsky@de.ibm.com>
7 * Copyright IBM Corp. 2003, 2009
8 */
9
10 #include <asm/idals.h>
11 #include <asm/ioctl.h>
12
13 /* ioctls for fullscreen 3270 */
14 #define TUBICMD _IO('3', 3) /* set ccw command for fs reads. */
15 #define TUBOCMD _IO('3', 4) /* set ccw command for fs writes. */
16 #define TUBGETI _IO('3', 7) /* get ccw command for fs reads. */
17 #define TUBGETO _IO('3', 8) /* get ccw command for fs writes. */
18 #define TUBSETMOD _IO('3',12) /* FIXME: what does it do ?*/
19 #define TUBGETMOD _IO('3',13) /* FIXME: what does it do ?*/
20
21 /* Local Channel Commands */
22 #define TC_WRITE 0x01 /* Write */
23 #define TC_RDBUF 0x02 /* Read Buffer */
24 #define TC_EWRITE 0x05 /* Erase write */
25 #define TC_READMOD 0x06 /* Read modified */
26 #define TC_EWRITEA 0x0d /* Erase write alternate */
27 #define TC_WRITESF 0x11 /* Write structured field */
28
29 /* Buffer Control Orders */
30 #define TO_SF 0x1d /* Start field */
31 #define TO_SBA 0x11 /* Set buffer address */
32 #define TO_IC 0x13 /* Insert cursor */
33 #define TO_PT 0x05 /* Program tab */
34 #define TO_RA 0x3c /* Repeat to address */
35 #define TO_SFE 0x29 /* Start field extended */
36 #define TO_EUA 0x12 /* Erase unprotected to address */
37 #define TO_MF 0x2c /* Modify field */
38 #define TO_SA 0x28 /* Set attribute */
39
40 /* Field Attribute Bytes */
41 #define TF_INPUT 0x40 /* Visible input */
42 #define TF_INPUTN 0x4c /* Invisible input */
43 #define TF_INMDT 0xc1 /* Visible, Set-MDT */
44 #define TF_LOG 0x60
45
46 /* Character Attribute Bytes */
47 #define TAT_RESET 0x00
48 #define TAT_FIELD 0xc0
49 #define TAT_EXTHI 0x41
50 #define TAT_COLOR 0x42
51 #define TAT_CHARS 0x43
52 #define TAT_TRANS 0x46
53
54 /* Extended-Highlighting Bytes */
55 #define TAX_RESET 0x00
56 #define TAX_BLINK 0xf1
57 #define TAX_REVER 0xf2
58 #define TAX_UNDER 0xf4
59
60 /* Reset value */
61 #define TAR_RESET 0x00
62
63 /* Color values */
64 #define TAC_RESET 0x00
65 #define TAC_BLUE 0xf1
66 #define TAC_RED 0xf2
67 #define TAC_PINK 0xf3
68 #define TAC_GREEN 0xf4
69 #define TAC_TURQ 0xf5
70 #define TAC_YELLOW 0xf6
71 #define TAC_WHITE 0xf7
72 #define TAC_DEFAULT 0x00
73
74 /* Write Control Characters */
75 #define TW_NONE 0x40 /* No particular action */
76 #define TW_KR 0xc2 /* Keyboard restore */
77 #define TW_PLUSALARM 0x04 /* Add this bit for alarm */
78
79 #define RAW3270_FIRSTMINOR 1 /* First minor number */
80 #define RAW3270_MAXDEVS 255 /* Max number of 3270 devices */
81
82 /* For TUBGETMOD and TUBSETMOD. Should include. */
83 struct raw3270_iocb {
84 short model;
85 short line_cnt;
86 short col_cnt;
87 short pf_cnt;
88 short re_cnt;
89 short map;
90 };
91
92 struct raw3270;
93 struct raw3270_view;
94
95 /* 3270 CCW request */
96 struct raw3270_request {
97 struct list_head list; /* list head for request queueing. */
98 struct raw3270_view *view; /* view of this request */
99 struct ccw1 ccw; /* single ccw. */
100 void *buffer; /* output buffer. */
101 size_t size; /* size of output buffer. */
102 int rescnt; /* residual count from devstat. */
103 int rc; /* return code for this request. */
104
105 /* Callback for delivering final status. */
106 void (*callback)(struct raw3270_request *, void *);
107 void *callback_data;
108 };
109
110 struct raw3270_request *raw3270_request_alloc(size_t size);
111 struct raw3270_request *raw3270_request_alloc_bootmem(size_t size);
112 void raw3270_request_free(struct raw3270_request *);
113 void raw3270_request_reset(struct raw3270_request *);
114 void raw3270_request_set_cmd(struct raw3270_request *, u8 cmd);
115 int raw3270_request_add_data(struct raw3270_request *, void *, size_t);
116 void raw3270_request_set_data(struct raw3270_request *, void *, size_t);
117 void raw3270_request_set_idal(struct raw3270_request *, struct idal_buffer *);
118
119 static inline int
120 raw3270_request_final(struct raw3270_request *rq)
121 {
122 return list_empty(&rq->list);
123 }
124
125 void raw3270_buffer_address(struct raw3270 *, char *, unsigned short);
126
127 /* Return value of *intv (see raw3270_fn below) can be one of the following: */
128 #define RAW3270_IO_DONE 0 /* request finished */
129 #define RAW3270_IO_BUSY 1 /* request still active */
130 #define RAW3270_IO_RETRY 2 /* retry current request */
131 #define RAW3270_IO_STOP 3 /* kill current request */
132
133 /*
134 * Functions of a 3270 view.
135 */
136 struct raw3270_fn {
137 int (*activate)(struct raw3270_view *);
138 void (*deactivate)(struct raw3270_view *);
139 int (*intv)(struct raw3270_view *,
140 struct raw3270_request *, struct irb *);
141 void (*release)(struct raw3270_view *);
142 void (*free)(struct raw3270_view *);
143 };
144
145 /*
146 * View structure chaining. The raw3270_view structure is meant to
147 * be embedded at the start of the real view data structure, e.g.:
148 * struct example {
149 * struct raw3270_view view;
150 * ...
151 * };
152 */
153 struct raw3270_view {
154 struct list_head list;
155 spinlock_t lock;
156 atomic_t ref_count;
157 struct raw3270 *dev;
158 struct raw3270_fn *fn;
159 unsigned int model;
160 unsigned int rows, cols; /* # of rows & colums of the view */
161 unsigned char *ascebc; /* ascii -> ebcdic table */
162 };
163
164 int raw3270_add_view(struct raw3270_view *, struct raw3270_fn *, int);
165 int raw3270_activate_view(struct raw3270_view *);
166 void raw3270_del_view(struct raw3270_view *);
167 void raw3270_deactivate_view(struct raw3270_view *);
168 struct raw3270_view *raw3270_find_view(struct raw3270_fn *, int);
169 int raw3270_start(struct raw3270_view *, struct raw3270_request *);
170 int raw3270_start_locked(struct raw3270_view *, struct raw3270_request *);
171 int raw3270_start_irq(struct raw3270_view *, struct raw3270_request *);
172 int raw3270_reset(struct raw3270_view *);
173 struct raw3270_view *raw3270_view(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(struct ccw_device *cdev);
192 void raw3270_wait_cons_dev(struct raw3270 *);
193
194 /* Notifier for device addition/removal */
195 int raw3270_register_notifier(void (*notifier)(int, int));
196 void raw3270_unregister_notifier(void (*notifier)(int, int));
197 void raw3270_pm_unfreeze(struct raw3270_view *);
198
199 /*
200 * Little memory allocator for string objects.
201 */
202 struct string
203 {
204 struct list_head list;
205 struct list_head update;
206 unsigned long size;
207 unsigned long len;
208 char string[0];
209 } __attribute__ ((aligned(8)));
210
211 static inline struct string *
212 alloc_string(struct list_head *free_list, unsigned long len)
213 {
214 struct string *cs, *tmp;
215 unsigned long size;
216
217 size = (len + 7L) & -8L;
218 list_for_each_entry(cs, free_list, list) {
219 if (cs->size < size)
220 continue;
221 if (cs->size > size + sizeof(struct string)) {
222 char *endaddr = (char *) (cs + 1) + cs->size;
223 tmp = (struct string *) (endaddr - size) - 1;
224 tmp->size = size;
225 cs->size -= size + sizeof(struct string);
226 cs = tmp;
227 } else
228 list_del(&cs->list);
229 cs->len = len;
230 INIT_LIST_HEAD(&cs->list);
231 INIT_LIST_HEAD(&cs->update);
232 return cs;
233 }
234 return NULL;
235 }
236
237 static inline unsigned long
238 free_string(struct list_head *free_list, struct string *cs)
239 {
240 struct string *tmp;
241 struct list_head *p, *left;
242
243 /* Find out the left neighbour in free memory list. */
244 left = free_list;
245 list_for_each(p, free_list) {
246 if (list_entry(p, struct string, list) > cs)
247 break;
248 left = p;
249 }
250 /* Try to merge with right neighbour = next element from left. */
251 if (left->next != free_list) {
252 tmp = list_entry(left->next, struct string, list);
253 if ((char *) (cs + 1) + cs->size == (char *) tmp) {
254 list_del(&tmp->list);
255 cs->size += tmp->size + sizeof(struct string);
256 }
257 }
258 /* Try to merge with left neighbour. */
259 if (left != free_list) {
260 tmp = list_entry(left, struct string, list);
261 if ((char *) (tmp + 1) + tmp->size == (char *) cs) {
262 tmp->size += cs->size + sizeof(struct string);
263 return tmp->size;
264 }
265 }
266 __list_add(&cs->list, left, left->next);
267 return cs->size;
268 }
269
270 static inline void
271 add_string_memory(struct list_head *free_list, void *mem, unsigned long size)
272 {
273 struct string *cs;
274
275 cs = (struct string *) mem;
276 cs->size = size - sizeof(struct string);
277 free_string(free_list, cs);
278 }
279
280
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