falconide.c revision d18812070efc658267f7573eec5ce7810128bfeb 
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#include <asm/ide.h>
24
25#define DRV_NAME "falconide"
26
27    /*
28     *  Base of the IDE interface
29     */
30
31#define ATA_HD_BASE	0xfff00000
32
33    /*
34     *  Offsets from the above base
35     */
36
37#define ATA_HD_CONTROL	0x39
38
39    /*
40     *  falconide_intr_lock is used to obtain access to the IDE interrupt,
41     *  which is shared between several drivers.
42     */
43
44static int falconide_intr_lock;
45
46static void falconide_release_lock(void)
47{
48	if (falconide_intr_lock == 0) {
49		printk(KERN_ERR "%s: bug\n", __func__);
50		return;
51	}
52	falconide_intr_lock = 0;
53	stdma_release();
54}
55
56static void falconide_get_lock(irq_handler_t handler, void *data)
57{
58	if (falconide_intr_lock == 0) {
59		if (in_interrupt() > 0)
60			panic("Falcon IDE hasn't ST-DMA lock in interrupt");
61		stdma_lock(handler, data);
62		falconide_intr_lock = 1;
63	}
64}
65
66static void falconide_input_data(ide_drive_t *drive, struct ide_cmd *cmd,
67				 void *buf, unsigned int len)
68{
69	unsigned long data_addr = drive->hwif->io_ports.data_addr;
70
71	if (drive->media == ide_disk && cmd && (cmd->tf_flags & IDE_TFLAG_FS)) {
72		__ide_mm_insw(data_addr, buf, (len + 1) / 2);
73		return;
74	}
75
76	raw_insw_swapw((u16 *)data_addr, buf, (len + 1) / 2);
77}
78
79static void falconide_output_data(ide_drive_t *drive, struct ide_cmd *cmd,
80				  void *buf, unsigned int len)
81{
82	unsigned long data_addr = drive->hwif->io_ports.data_addr;
83
84	if (drive->media == ide_disk && cmd && (cmd->tf_flags & IDE_TFLAG_FS)) {
85		__ide_mm_outsw(data_addr, buf, (len + 1) / 2);
86		return;
87	}
88
89	raw_outsw_swapw((u16 *)data_addr, buf, (len + 1) / 2);
90}
91
92/* Atari has a byte-swapped IDE interface */
93static const struct ide_tp_ops falconide_tp_ops = {
94	.exec_command		= ide_exec_command,
95	.read_status		= ide_read_status,
96	.read_altstatus		= ide_read_altstatus,
97	.write_devctl		= ide_write_devctl,
98
99	.dev_select		= ide_dev_select,
100	.tf_load		= ide_tf_load,
101	.tf_read		= ide_tf_read,
102
103	.input_data		= falconide_input_data,
104	.output_data		= falconide_output_data,
105};
106
107static const struct ide_port_info falconide_port_info = {
108	.get_lock		= falconide_get_lock,
109	.release_lock		= falconide_release_lock,
110	.tp_ops			= &falconide_tp_ops,
111	.host_flags		= IDE_HFLAG_MMIO | IDE_HFLAG_SERIALIZE |
112				  IDE_HFLAG_NO_DMA,
113	.irq_flags		= IRQF_SHARED,
114};
115
116static void __init falconide_setup_ports(hw_regs_t *hw)
117{
118	int i;
119
120	memset(hw, 0, sizeof(*hw));
121
122	hw->io_ports.data_addr = ATA_HD_BASE;
123
124	for (i = 1; i < 8; i++)
125		hw->io_ports_array[i] = ATA_HD_BASE + 1 + i * 4;
126
127	hw->io_ports.ctl_addr = ATA_HD_BASE + ATA_HD_CONTROL;
128
129	hw->irq = IRQ_MFP_IDE;
130	hw->ack_intr = NULL;
131
132	hw->chipset = ide_generic;
133}
134
135    /*
136     *  Probe for a Falcon IDE interface
137     */
138
139static int __init falconide_init(void)
140{
141	struct ide_host *host;
142	hw_regs_t hw, *hws[] = { &hw, NULL, NULL, NULL };
143	int rc;
144
145	if (!MACH_IS_ATARI || !ATARIHW_PRESENT(IDE))
146		return -ENODEV;
147
148	printk(KERN_INFO "ide: Falcon IDE controller\n");
149
150	if (!request_mem_region(ATA_HD_BASE, 0x40, DRV_NAME)) {
151		printk(KERN_ERR "%s: resources busy\n", DRV_NAME);
152		return -EBUSY;
153	}
154
155	falconide_setup_ports(&hw);
156
157	host = ide_host_alloc(&falconide_port_info, hws);
158	if (host == NULL) {
159		rc = -ENOMEM;
160		goto err;
161	}
162
163	falconide_get_lock(NULL, NULL);
164	rc = ide_host_register(host, &falconide_port_info, hws);
165	falconide_release_lock();
166
167	if (rc)
168		goto err_free;
169
170	return 0;
171err_free:
172	ide_host_free(host);
173err:
174	release_mem_region(ATA_HD_BASE, 0x40);
175	return rc;
176}
177
178module_init(falconide_init);
179
180MODULE_LICENSE("GPL");
181