aboutsummaryrefslogtreecommitdiff
path: root/drivers/ide/falconide.c
blob: b368a5effc3a029240a7dde6ff8abd265fc39346 (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
/*
 *  Atari Falcon IDE Driver
 *
 *     Created 12 Jul 1997 by Geert Uytterhoeven
 *
 *  This file is subject to the terms and conditions of the GNU General Public
 *  License.  See the file COPYING in the main directory of this archive for
 *  more details.
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/blkdev.h>
#include <linux/ide.h>
#include <linux/init.h>

#include <asm/setup.h>
#include <asm/atarihw.h>
#include <asm/atariints.h>
#include <asm/atari_stdma.h>

#define DRV_NAME "falconide"

    /*
     *  Base of the IDE interface
     */

#define ATA_HD_BASE	0xfff00000

    /*
     *  Offsets from the above base
     */

#define ATA_HD_CONTROL	0x39

    /*
     *  falconide_intr_lock is used to obtain access to the IDE interrupt,
     *  which is shared between several drivers.
     */

static int falconide_intr_lock;

static void falconide_release_lock(void)
{
	if (falconide_intr_lock == 0) {
		printk(KERN_ERR "%s: bug\n", __func__);
		return;
	}
	falconide_intr_lock = 0;
	stdma_release();
}

static void falconide_get_lock(irq_handler_t handler, void *data)
{
	if (falconide_intr_lock == 0) {
		if (in_interrupt() > 0)
			panic("Falcon IDE hasn't ST-DMA lock in interrupt");
		stdma_lock(handler, data);
		falconide_intr_lock = 1;
	}
}

static void falconide_input_data(ide_drive_t *drive, struct ide_cmd *cmd,
				 void *buf, unsigned int len)
{
	unsigned long data_addr = drive->hwif->io_ports.data_addr;

	if (drive->media == ide_disk && cmd && (cmd->tf_flags & IDE_TFLAG_FS))
		return insw(data_addr, buf, (len + 1) / 2);

	raw_insw_swapw((u16 *)data_addr, buf, (len + 1) / 2);
}

static void falconide_output_data(ide_drive_t *drive, struct ide_cmd *cmd,
				  void *buf, unsigned int len)
{
	unsigned long data_addr = drive->hwif->io_ports.data_addr;

	if (drive->media == ide_disk && cmd && (cmd->tf_flags & IDE_TFLAG_FS))
		return outsw(data_addr, buf, (len + 1) / 2);

	raw_outsw_swapw((u16 *)data_addr, buf, (len + 1) / 2);
}

/* Atari has a byte-swapped IDE interface */
static const struct ide_tp_ops falconide_tp_ops = {
	.exec_command		= ide_exec_command,
	.read_status		= ide_read_status,
	.read_altstatus		= ide_read_altstatus,

	.set_irq		= ide_set_irq,

	.tf_load		= ide_tf_load,
	.tf_read		= ide_tf_read,

	.input_data		= falconide_input_data,
	.output_data		= falconide_output_data,
};

static const struct ide_port_info falconide_port_info = {
	.get_lock		= falconide_get_lock,
	.release_lock		= falconide_release_lock,
	.tp_ops			= &falconide_tp_ops,
	.host_flags		= IDE_HFLAG_MMIO | IDE_HFLAG_SERIALIZE |
				  IDE_HFLAG_NO_DMA,
	.irq_flags		= IRQF_SHARED,
};

static void __init falconide_setup_ports(hw_regs_t *hw)
{
	int i;

	memset(hw, 0, sizeof(*hw));

	hw->io_ports.data_addr = ATA_HD_BASE;

	for (i = 1; i < 8; i++)
		hw->io_ports_array[i] = ATA_HD_BASE + 1 + i * 4;

	hw->io_ports.ctl_addr = ATA_HD_BASE + ATA_HD_CONTROL;

	hw->irq = IRQ_MFP_IDE;
	hw->ack_intr = NULL;

	hw->chipset = ide_generic;
}

    /*
     *  Probe for a Falcon IDE interface
     */

static int __init falconide_init(void)
{
	struct ide_host *host;
	hw_regs_t hw, *hws[] = { &hw, NULL, NULL, NULL };
	int rc;

	if (!MACH_IS_ATARI || !ATARIHW_PRESENT(IDE))
		return -ENODEV;

	printk(KERN_INFO "ide: Falcon IDE controller\n");

	if (!request_mem_region(ATA_HD_BASE, 0x40, DRV_NAME)) {
		printk(KERN_ERR "%s: resources busy\n", DRV_NAME);
		return -EBUSY;
	}

	falconide_setup_ports(&hw);

	host = ide_host_alloc(&falconide_port_info, hws);
	if (host == NULL) {
		rc = -ENOMEM;
		goto err;
	}

	falconide_get_lock(NULL, NULL);
	rc = ide_host_register(host, &falconide_port_info, hws);
	falconide_release_lock();

	if (rc)
		goto err_free;

	return 0;
err_free:
	ide_host_free(host);
err:
	release_mem_region(ATA_HD_BASE, 0x40);
	return rc;
}

module_init(falconide_init);

MODULE_LICENSE("GPL");