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1.1 root 1: /* mbavar.h 4.15 81/04/08 */
2:
3: /*
4: * This file contains definitions related to the kernel structures
5: * for dealing with the massbus adapters.
6: *
7: * Each mba has a mba_hd structure.
8: * Each massbus device has a mba_device structure.
9: * Each massbus slave has a mba_slave structure.
10: *
11: * At boot time we prowl the structures and fill in the pointers
12: * for devices which we find.
13: */
14:
15: /*
16: * Per-mba structure.
17: *
18: * The initialization routine uses the information in the mbdinit table
19: * to initialize the what is attached to each massbus slot information.
20: * It counts the number of devices on each mba (to see if bothering to
21: * search/seek is appropriate).
22: *
23: * During normal operation, the devices attached to the mba which wish
24: * to transfer are queued on the mh_act? links.
25: */
26: struct mba_hd {
27: short mh_active; /* set if mba is active */
28: short mh_ndrive; /* number of devices, to avoid seeks */
29: struct mba_regs *mh_mba; /* virt addr of mba */
30: struct mba_regs *mh_physmba; /* phys addr of mba */
31: struct mba_device *mh_mbip[8]; /* what is attached to each dev */
32: struct mba_device *mh_actf; /* head of queue to transfer */
33: struct mba_device *mh_actl; /* tail of queue to transfer */
34: };
35:
36: /*
37: * Per-device structure
38: * (one for each RM/RP disk, and one for each tape formatter).
39: *
40: * This structure is used by the device driver as its argument
41: * to the massbus driver, and by the massbus driver to locate
42: * the device driver for a particular massbus slot.
43: *
44: * The device drivers hang ready buffers on this structure,
45: * and the massbus driver will start i/o on the first such buffer
46: * when appropriate.
47: */
48: struct mba_device {
49: struct mba_driver *mi_driver;
50: short mi_unit; /* unit number to the system */
51: short mi_mbanum; /* the mba it is on */
52: short mi_drive; /* controller on mba */
53: short mi_dk; /* driver number for iostat */
54: short mi_alive; /* device exists */
55: short mi_type; /* driver specific unit type */
56: struct buf mi_tab; /* head of queue for this device */
57: struct mba_device *mi_forw;
58: /* we could compute these every time, but hereby save time */
59: struct mba_regs *mi_mba;
60: struct mba_drv *mi_drv;
61: struct mba_hd *mi_hd;
62: };
63:
64: /*
65: * Tape formatter slaves are specified by
66: * the following information which is used
67: * at boot time to initialize the tape driver
68: * internal tables.
69: */
70: struct mba_slave {
71: struct mba_driver *ms_driver;
72: short ms_ctlr; /* which of several formatters */
73: short ms_unit; /* which unit to system */
74: short ms_slave; /* which slave to formatter */
75: short ms_alive;
76: };
77:
78: /*
79: * Per device-type structure.
80: *
81: * Each massbus driver defines entries for a set of routines used
82: * by the massbus driver, as well as an array of types which are
83: * acceptable to it.
84: */
85: struct mba_driver {
86: int (*md_attach)(); /* attach a device */
87: int (*md_slave)(); /* attach a slave */
88: int (*md_ustart)(); /* unit start routine */
89: int (*md_start)(); /* setup a data transfer */
90: int (*md_dtint)(); /* data transfer complete */
91: int (*md_ndint)(); /* non-data transfer interrupt */
92: short *md_type; /* array of drive type codes */
93: char *md_dname, *md_sname; /* device, slave names */
94: struct mba_device **md_info; /* backpointers to mbinit structs */
95: };
96:
97: /*
98: * Possible return values from unit start routines.
99: */
100: #define MBU_NEXT 0 /* skip to next operation */
101: #define MBU_BUSY 1 /* dual port busy; wait for intr */
102: #define MBU_STARTED 2 /* non-data transfer started */
103: #define MBU_DODATA 3 /* data transfer ready; start mba */
104:
105: /*
106: * Possible return values from data transfer interrupt handling routines
107: */
108: #define MBD_DONE 0 /* data transfer complete */
109: #define MBD_RETRY 1 /* error occurred, please retry */
110: #define MBD_RESTARTED 2 /* driver restarted i/o itself */
111:
112: /*
113: * Possible return values from non-data-transfer interrupt handling routines
114: */
115: #define MBN_DONE 0 /* non-data transfer complete */
116: #define MBN_RETRY 1 /* failed; retry the operation */
117: #define MBN_SKIP 2 /* don't do anything */
118:
119: /*
120: * Clear attention status for specified device.
121: */
122: #define mbclrattn(mi) ((mi)->mi_mba->mba_drv[0].mbd_as = 1 << (mi)->mi_drive)
123:
124: /*
125: * Kernel definitions related to mba.
126: */
127: #ifdef KERNEL
128: int nummba;
129: #if NMBA > 0
130: struct mba_hd mba_hd[NMBA];
131: extern Xmba0int(), Xmba1int(), Xmba2int(), Xmba3int();
132:
133: extern struct mba_device mbdinit[];
134: extern struct mba_slave mbsinit[];
135: #endif
136: #endif
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