summaryrefslogtreecommitdiffstatshomepage
path: root/src/devices/bus/nscsi/s1410.cpp
blob: c0812a6db52c5b29143d583c86563f1d876955b1 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
// license:BSD-3-Clause
// copyright-holders:Olivier Galibert
#include "emu.h"
#include "bus/nscsi/s1410.h"

#define LOG_GENERAL (1U << 0)
#define LOG_COMMAND (1U << 1)
#define LOG_DATA    (1U << 2)

#define VERBOSE 0

#include "logmacro.h"

DEFINE_DEVICE_TYPE(NSCSI_S1410, nscsi_s1410_device, "scsi_s1410", "Xebec S1410 5.25 Inch Winchester Disk Controller")

nscsi_s1410_device::nscsi_s1410_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock) :
	nscsi_harddisk_device(mconfig, NSCSI_S1410, tag, owner, clock)
{
}

void nscsi_s1410_device::device_reset()
{
	nscsi_harddisk_device::device_reset();

	// initialize drive characteristics
	params[0] = 0;
	params[1] = 153;
	params[2] = 4;
	params[3] = 0;
	params[4] = 128;
	params[5] = 0;
	params[6] = 64;
	params[7] = 11;
}

void nscsi_s1410_device::scsi_command()
{
	switch(scsi_cmdbuf[0]) {
	case SC_TEST_UNIT_READY:
	case SC_REZERO:
	case SC_REASSIGN_BLOCKS:
	case SC_READ:
	case SC_WRITE:
	case SC_SEEK:
		if (scsi_cmdbuf[1] >> 5) {
			scsi_status_complete(SS_NOT_READY);
		} else {
			nscsi_harddisk_device::scsi_command();
		}
		break;

	case SC_REQUEST_SENSE:
		scsi_data_in(SBUF_SENSE, 4);
		scsi_status_complete(SS_GOOD);
		break;

	case SC_FORMAT_UNIT:
		LOG("command FORMAT UNIT\n");
		{
			const auto &info = harddisk->get_info();
			auto block = std::make_unique<uint8_t[]>(info.sectorbytes);
			memset(&block[0], 0x6c, info.sectorbytes);
			lba = ((scsi_cmdbuf[1] & 0x1f)<<16) | (scsi_cmdbuf[2]<<8) | scsi_cmdbuf[3];
			for(; lba < (info.cylinders * info.heads * info.sectors); lba++) {
				harddisk->write(lba, block.get());
			}
		}
		scsi_status_complete(SS_GOOD);
		break;

	case SC_FORMAT_TRACK: {
		if (scsi_cmdbuf[1] >> 5) {
			scsi_status_complete(SS_NOT_READY);
			return;
		}

		lba = ((scsi_cmdbuf[1] & 0x1f)<<16) | (scsi_cmdbuf[2]<<8) | scsi_cmdbuf[3];
		blocks = (bytes_per_sector == 256) ? 32 : 17;

		int track_length = blocks*bytes_per_sector;
		auto block = std::make_unique<uint8_t[]>(track_length);
		memset(&block[0], 0x6c, track_length);

		if(!harddisk->write(lba, &block[0])) {
			logerror("%s: HD WRITE ERROR !\n", tag());
			scsi_status_complete(SS_FORMAT_ERROR);
		} else {
			scsi_status_complete(SS_GOOD);
		}
		}
		break;

	case SC_FORMAT_ALT_TRACK:
		if (scsi_cmdbuf[1] >> 5) {
			scsi_status_complete(SS_NOT_READY);
			return;
		}

		scsi_data_out(2, 3);
		scsi_status_complete(SS_GOOD);
		break;

	case SC_INIT_DRIVE_PARAMS:
		scsi_data_out(2, 8);
		scsi_status_complete(SS_GOOD);
		break;

	case SC_WRITE_SECTOR_BUFFER:
		scsi_data_out(2, bytes_per_sector);
		scsi_status_complete(SS_GOOD);
		break;

	case SC_READ_SECTOR_BUFFER:
		scsi_data_in(2, bytes_per_sector);
		scsi_status_complete(SS_GOOD);
		break;

	case SC_CHECK_TRACK_FORMAT:
		if (scsi_cmdbuf[1] >> 5) {
			scsi_status_complete(SS_NOT_READY);
			return;
		}
		scsi_status_complete(SS_GOOD);
		break;

	case SC_READ_ECC_BURST:
	case SC_RAM_DIAG:
	case SC_DRIVE_DIAG:
	case SC_CONTROLLER_DIAG:
	case SC_READ_LONG:
	case SC_WRITE_LONG:
		scsi_status_complete(SS_GOOD);
		break;

	default:
		logerror("%s: command %02x ***UNKNOWN***\n", tag(), scsi_cmdbuf[0]);
		break;
	}
}

uint8_t nscsi_s1410_device::scsi_get_data(int id, int pos)
{
	switch(scsi_cmdbuf[0]) {
	case SC_READ_SECTOR_BUFFER:
		return block[pos];

	default:
		return nscsi_harddisk_device::scsi_get_data(id, pos);
	}
}

void nscsi_s1410_device::scsi_put_data(int id, int pos, uint8_t data)
{
	if(id != 2 && !pos) {
		return nscsi_harddisk_device::scsi_put_data(id, pos, data);
	}

	switch(scsi_cmdbuf[0]) {
	case SC_FORMAT_ALT_TRACK:
		LOGMASKED(LOG_DATA, "s1410: scsi_put_data, id:%d pos:%d data:%02x %c\n", id, pos, data, data >= 0x20 && data < 0x7f ? (char)data : ' ');
		break;

	case SC_INIT_DRIVE_PARAMS:
		LOGMASKED(LOG_DATA, "s1410: scsi_put_data, id:%d pos:%d data:%02x %c\n", id, pos, data, data >= 0x20 && data < 0x7f ? (char)data : ' ');
		params[pos] = data;
		break;

	case SC_WRITE_SECTOR_BUFFER:
		LOGMASKED(LOG_DATA, "s1410: scsi_put_data, id:%d pos:%d data:%02x %c\n", id, pos, data, data >= 0x20 && data < 0x7f ? (char)data : ' ');
		block[pos] = data;
		break;

	default:
		return nscsi_harddisk_device::scsi_put_data(id, pos, data);
	}
}