falconide.c revision abb8817967cc080ee024f7d1a3d5a9830074ca1c 
1/*
2 *  Atari Falcon IDE Driver
3 *
4 *     Created 12 Jul 1997 by Geert Uytterhoeven
5 *
6 *  This file is subject to the terms and conditions of the GNU General Public
7 *  License.  See the file COPYING in the main directory of this archive for
8 *  more details.
9 */
10
11#include <linux/module.h>
12#include <linux/types.h>
13#include <linux/mm.h>
14#include <linux/interrupt.h>
15#include <linux/blkdev.h>
16#include <linux/ide.h>
17#include <linux/init.h>
18
19#include <asm/setup.h>
20#include <asm/atarihw.h>
21#include <asm/atariints.h>
22#include <asm/atari_stdma.h>
23
24#define DRV_NAME "falconide"
25
26    /*
27     *  Base of the IDE interface
28     */
29
30#define ATA_HD_BASE	0xfff00000
31
32    /*
33     *  Offsets from the above base
34     */
35
36#define ATA_HD_CONTROL	0x39
37
38    /*
39     *  falconide_intr_lock is used to obtain access to the IDE interrupt,
40     *  which is shared between several drivers.
41     */
42
43int falconide_intr_lock;
44EXPORT_SYMBOL(falconide_intr_lock);
45
46static void falconide_input_data(ide_drive_t *drive, struct request *rq,
47				 void *buf, unsigned int len)
48{
49	unsigned long data_addr = drive->hwif->io_ports.data_addr;
50
51	if (drive->media == ide_disk && rq && rq->cmd_type == REQ_TYPE_FS)
52		return insw(data_addr, buf, (len + 1) / 2);
53
54	insw_swapw(data_addr, buf, (len + 1) / 2);
55}
56
57static void falconide_output_data(ide_drive_t *drive, struct request *rq,
58				  void *buf, unsigned int len)
59{
60	unsigned long data_addr = drive->hwif->io_ports.data_addr;
61
62	if (drive->media == ide_disk && rq && rq->cmd_type == REQ_TYPE_FS)
63		return outsw(data_addr, buf, (len + 1) / 2);
64
65	outsw_swapw(data_addr, buf, (len + 1) / 2);
66}
67
68/* Atari has a byte-swapped IDE interface */
69static const struct ide_tp_ops falconide_tp_ops = {
70	.exec_command		= ide_exec_command,
71	.read_status		= ide_read_status,
72	.read_altstatus		= ide_read_altstatus,
73
74	.set_irq		= ide_set_irq,
75
76	.tf_load		= ide_tf_load,
77	.tf_read		= ide_tf_read,
78
79	.input_data		= falconide_input_data,
80	.output_data		= falconide_output_data,
81};
82
83static const struct ide_port_info falconide_port_info = {
84	.tp_ops			= &falconide_tp_ops,
85	.host_flags		= IDE_HFLAG_NO_DMA | IDE_HFLAG_SERIALIZE,
86};
87
88static void __init falconide_setup_ports(hw_regs_t *hw)
89{
90	int i;
91
92	memset(hw, 0, sizeof(*hw));
93
94	hw->io_ports.data_addr = ATA_HD_BASE;
95
96	for (i = 1; i < 8; i++)
97		hw->io_ports_array[i] = ATA_HD_BASE + 1 + i * 4;
98
99	hw->io_ports.ctl_addr = ATA_HD_BASE + ATA_HD_CONTROL;
100
101	hw->irq = IRQ_MFP_IDE;
102	hw->ack_intr = NULL;
103
104	hw->chipset = ide_generic;
105}
106
107    /*
108     *  Probe for a Falcon IDE interface
109     */
110
111static int __init falconide_init(void)
112{
113	struct ide_host *host;
114	hw_regs_t hw, *hws[] = { &hw, NULL, NULL, NULL };
115	int rc;
116
117	if (!MACH_IS_ATARI || !ATARIHW_PRESENT(IDE))
118		return -ENODEV;
119
120	printk(KERN_INFO "ide: Falcon IDE controller\n");
121
122	if (!request_mem_region(ATA_HD_BASE, 0x40, DRV_NAME)) {
123		printk(KERN_ERR "%s: resources busy\n", DRV_NAME);
124		return -EBUSY;
125	}
126
127	falconide_setup_ports(&hw);
128
129	host = ide_host_alloc(&falconide_port_info, hws);
130	if (host == NULL) {
131		rc = -ENOMEM;
132		goto err;
133	}
134
135	ide_get_lock(NULL, NULL);
136	rc = ide_host_register(host, &falconide_port_info, hws);
137	ide_release_lock();
138
139	if (rc)
140		goto err_free;
141
142	return 0;
143err_free:
144	ide_host_free(host);
145err:
146	release_mem_region(ATA_HD_BASE, 0x40);
147	return rc;
148}
149
150module_init(falconide_init);
151
152MODULE_LICENSE("GPL");
153