summaryrefslogtreecommitdiffstats
path: root/drivers/ide/ide-devsets.c
blob: 5bf958e5b1d5fabe5019266448fe623065e69a82 (plain)
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
177
178
179
180
181
182
183
184
185
186
187
188

#include <linux/kernel.h>
#include <linux/ide.h>

DEFINE_MUTEX(ide_setting_mtx);

ide_devset_get(io_32bit, io_32bit);

static int set_io_32bit(ide_drive_t *drive, int arg)
{
	if (drive->dev_flags & IDE_DFLAG_NO_IO_32BIT)
		return -EPERM;

	if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
		return -EINVAL;

	drive->io_32bit = arg;

	return 0;
}

ide_devset_get_flag(ksettings, IDE_DFLAG_KEEP_SETTINGS);

static int set_ksettings(ide_drive_t *drive, int arg)
{
	if (arg < 0 || arg > 1)
		return -EINVAL;

	if (arg)
		drive->dev_flags |= IDE_DFLAG_KEEP_SETTINGS;
	else
		drive->dev_flags &= ~IDE_DFLAG_KEEP_SETTINGS;

	return 0;
}

ide_devset_get_flag(using_dma, IDE_DFLAG_USING_DMA);

static int set_using_dma(ide_drive_t *drive, int arg)
{
#ifdef CONFIG_BLK_DEV_IDEDMA
	int err = -EPERM;

	if (arg < 0 || arg > 1)
		return -EINVAL;

	if (ata_id_has_dma(drive->id) == 0)
		goto out;

	if (drive->hwif->dma_ops == NULL)
		goto out;

	err = 0;

	if (arg) {
		if (ide_set_dma(drive))
			err = -EIO;
	} else
		ide_dma_off(drive);

out:
	return err;
#else
	if (arg < 0 || arg > 1)
		return -EINVAL;

	return -EPERM;
#endif
}

/*
 * handle HDIO_SET_PIO_MODE ioctl abusers here, eventually it will go away
 */
static int set_pio_mode_abuse(ide_hwif_t *hwif, u8 req_pio)
{
	switch (req_pio) {
	case 202:
	case 201:
	case 200:
	case 102:
	case 101:
	case 100:
		return (hwif->host_flags & IDE_HFLAG_ABUSE_DMA_MODES) ? 1 : 0;
	case 9:
	case 8:
		return (hwif->host_flags & IDE_HFLAG_ABUSE_PREFETCH) ? 1 : 0;
	case 7:
	case 6:
		return (hwif->host_flags & IDE_HFLAG_ABUSE_FAST_DEVSEL) ? 1 : 0;
	default:
		return 0;
	}
}

static int set_pio_mode(ide_drive_t *drive, int arg)
{
	ide_hwif_t *hwif = drive->hwif;
	const struct ide_port_ops *port_ops = hwif->port_ops;

	if (arg < 0 || arg > 255)
		return -EINVAL;

	if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
	    (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
		return -ENOSYS;

	if (set_pio_mode_abuse(drive->hwif, arg)) {
		if (arg == 8 || arg == 9) {
			unsigned long flags;

			/* take lock for IDE_DFLAG_[NO_]UNMASK/[NO_]IO_32BIT */
			spin_lock_irqsave(&hwif->lock, flags);
			port_ops->set_pio_mode(drive, arg);
			spin_unlock_irqrestore(&hwif->lock, flags);
		} else
			port_ops->set_pio_mode(drive, arg);
	} else {
		int keep_dma = !!(drive->dev_flags & IDE_DFLAG_USING_DMA);

		ide_set_pio(drive, arg);

		if (hwif->host_flags & IDE_HFLAG_SET_PIO_MODE_KEEP_DMA) {
			if (keep_dma)
				ide_dma_on(drive);
		}
	}

	return 0;
}

ide_devset_get_flag(unmaskirq, IDE_DFLAG_UNMASK);

static int set_unmaskirq(ide_drive_t *drive, int arg)
{
	if (drive->dev_flags & IDE_DFLAG_NO_UNMASK)
		return -EPERM;

	if (arg < 0 || arg > 1)
		return -EINVAL;

	if (arg)
		drive->dev_flags |= IDE_DFLAG_UNMASK;
	else
		drive->dev_flags &= ~IDE_DFLAG_UNMASK;

	return 0;
}

ide_ext_devset_rw_sync(io_32bit, io_32bit);
ide_ext_devset_rw_sync(keepsettings, ksettings);
ide_ext_devset_rw_sync(unmaskirq, unmaskirq);
ide_ext_devset_rw_sync(using_dma, using_dma);
__IDE_DEVSET(pio_mode, DS_SYNC, NULL, set_pio_mode);

int ide_devset_execute(ide_drive_t *drive, const struct ide_devset *setting,
		       int arg)
{
	struct request_queue *q = drive->queue;
	struct request *rq;
	int ret = 0;

	if (!(setting->flags & DS_SYNC))
		return setting->set(drive, arg);

	rq = blk_get_request(q, READ, __GFP_WAIT);
	rq->cmd_type = REQ_TYPE_SPECIAL;
	rq->cmd_len = 5;
	rq->cmd[0] = REQ_DEVSET_EXEC;
	*(int *)&rq->cmd[1] = arg;
	rq->special = setting->set;

	if (blk_execute_rq(q, NULL, rq, 0))
		ret = rq->errors;
	blk_put_request(rq);

	return ret;
}

ide_startstop_t ide_do_devset(ide_drive_t *drive, struct request *rq)
{
	int err, (*setfunc)(ide_drive_t *, int) = rq->special;

	err = setfunc(drive, *(int *)&rq->cmd[1]);
	if (err)
		rq->errors = err;
	ide_complete_rq(drive, err, ide_rq_bytes(rq));
	return ide_stopped;
}