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 */
ccw_dev_id_is_equal(struct ccw_dev_id * dev_id1,struct ccw_dev_id * dev_id2)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
296