falconide.c revision ecf3a31d2a08a419bdf919456f1724f5b72bde2c 
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
43static int falconide_intr_lock;
44
45static void falconide_release_lock(void)
46{
47	if (falconide_intr_lock == 0) {
48		printk(KERN_ERR "%s: bug\n", __func__);
49		return;
50	}
51	falconide_intr_lock = 0;
52	stdma_release();
53}
54
55static void falconide_get_lock(irq_handler_t handler, void *data)
56{
57	if (falconide_intr_lock == 0) {
58		if (in_interrupt() > 0)
59			panic("Falcon IDE hasn't ST-DMA lock in interrupt");
60		stdma_lock(handler, data);
61		falconide_intr_lock = 1;
62	}
63}
64
65static void falconide_input_data(ide_drive_t *drive, struct ide_cmd *cmd,
66				 void *buf, unsigned int len)
67{
68	unsigned long data_addr = drive->hwif->io_ports.data_addr;
69
70	if (drive->media == ide_disk && cmd && (cmd->tf_flags & IDE_TFLAG_FS))
71		return insw(data_addr, buf, (len + 1) / 2);
72
73	raw_insw_swapw((u16 *)data_addr, buf, (len + 1) / 2);
74}
75
76static void falconide_output_data(ide_drive_t *drive, struct ide_cmd *cmd,
77				  void *buf, unsigned int len)
78{
79	unsigned long data_addr = drive->hwif->io_ports.data_addr;
80
81	if (drive->media == ide_disk && cmd && (cmd->tf_flags & IDE_TFLAG_FS))
82		return outsw(data_addr, buf, (len + 1) / 2);
83
84	raw_outsw_swapw((u16 *)data_addr, buf, (len + 1) / 2);
85}
86
87/* Atari has a byte-swapped IDE interface */
88static const struct ide_tp_ops falconide_tp_ops = {
89	.exec_command		= ide_exec_command,
90	.read_status		= ide_read_status,
91	.read_altstatus		= ide_read_altstatus,
92	.write_devctl		= ide_write_devctl,
93
94	.tf_load		= ide_tf_load,
95	.tf_read		= ide_tf_read,
96
97	.input_data		= falconide_input_data,
98	.output_data		= falconide_output_data,
99};
100
101static const struct ide_port_info falconide_port_info = {
102	.get_lock		= falconide_get_lock,
103	.release_lock		= falconide_release_lock,
104	.tp_ops			= &falconide_tp_ops,
105	.host_flags		= IDE_HFLAG_MMIO | IDE_HFLAG_SERIALIZE |
106				  IDE_HFLAG_NO_DMA,
107	.irq_flags		= IRQF_SHARED,
108};
109
110static void __init falconide_setup_ports(hw_regs_t *hw)
111{
112	int i;
113
114	memset(hw, 0, sizeof(*hw));
115
116	hw->io_ports.data_addr = ATA_HD_BASE;
117
118	for (i = 1; i < 8; i++)
119		hw->io_ports_array[i] = ATA_HD_BASE + 1 + i * 4;
120
121	hw->io_ports.ctl_addr = ATA_HD_BASE + ATA_HD_CONTROL;
122
123	hw->irq = IRQ_MFP_IDE;
124	hw->ack_intr = NULL;
125
126	hw->chipset = ide_generic;
127}
128
129    /*
130     *  Probe for a Falcon IDE interface
131     */
132
133static int __init falconide_init(void)
134{
135	struct ide_host *host;
136	hw_regs_t hw, *hws[] = { &hw, NULL, NULL, NULL };
137	int rc;
138
139	if (!MACH_IS_ATARI || !ATARIHW_PRESENT(IDE))
140		return -ENODEV;
141
142	printk(KERN_INFO "ide: Falcon IDE controller\n");
143
144	if (!request_mem_region(ATA_HD_BASE, 0x40, DRV_NAME)) {
145		printk(KERN_ERR "%s: resources busy\n", DRV_NAME);
146		return -EBUSY;
147	}
148
149	falconide_setup_ports(&hw);
150
151	host = ide_host_alloc(&falconide_port_info, hws);
152	if (host == NULL) {
153		rc = -ENOMEM;
154		goto err;
155	}
156
157	falconide_get_lock(NULL, NULL);
158	rc = ide_host_register(host, &falconide_port_info, hws);
159	falconide_release_lock();
160
161	if (rc)
162		goto err_free;
163
164	return 0;
165err_free:
166	ide_host_free(host);
167err:
168	release_mem_region(ATA_HD_BASE, 0x40);
169	return rc;
170}
171
172module_init(falconide_init);
173
174MODULE_LICENSE("GPL");
175