tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 .read_sff_dma_status = ide_read_sff_dma_status,
74
75 .set_irq = ide_set_irq,
76
77 .tf_load = ide_tf_load,
78 .tf_read = ide_tf_read,
79
80 .input_data = falconide_input_data,
81 .output_data = falconide_output_data,
82};
83
84static const struct ide_port_info falconide_port_info = {
85 .tp_ops = &falconide_tp_ops,
86 .host_flags = IDE_HFLAG_NO_DMA,
87};
88
89static void __init falconide_setup_ports(hw_regs_t *hw)
90{
91 int i;
92
93 memset(hw, 0, sizeof(*hw));
94
95 hw->io_ports.data_addr = ATA_HD_BASE;
96
97 for (i = 1; i < 8; i++)
98 hw->io_ports_array[i] = ATA_HD_BASE + 1 + i * 4;
99
100 hw->io_ports.ctl_addr = ATA_HD_BASE + ATA_HD_CONTROL;
101
102 hw->irq = IRQ_MFP_IDE;
103 hw->ack_intr = NULL;
104
105 hw->chipset = ide_generic;
106}
107
108 /*
109 * Probe for a Falcon IDE interface
110 */
111
112static int __init falconide_init(void)
113{
114 struct ide_host *host;
115 hw_regs_t hw, *hws[] = { &hw, NULL, NULL, NULL };
116 int rc;
117
118 if (!MACH_IS_ATARI || !ATARIHW_PRESENT(IDE))
119 return -ENODEV;
120
121 printk(KERN_INFO "ide: Falcon IDE controller\n");
122
123 if (!request_mem_region(ATA_HD_BASE, 0x40, DRV_NAME)) {
124 printk(KERN_ERR "%s: resources busy\n", DRV_NAME);
125 return -EBUSY;
126 }
127
128 falconide_setup_ports(&hw);
129
130 host = ide_host_alloc(&falconide_port_info, hws);
131 if (host == NULL) {
132 rc = -ENOMEM;
133 goto err;
134 }
135
136 ide_get_lock(NULL, NULL);
137 rc = ide_host_register(host, &falconide_port_info, hws);
138 ide_release_lock();
139
140 if (rc)
141 goto err_free;
142
143 return 0;
144err_free:
145 ide_host_free(host);
146err:
147 release_mem_region(ATA_HD_BASE, 0x40);
148 return rc;
149}
150
151module_init(falconide_init);
152
153MODULE_LICENSE("GPL");