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