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
44 static int falconide_intr_lock;
45
46 static 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
56 static 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
66 static 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
79 static 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 */
93 static 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
107 static 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 .chipset = ide_generic,
115 };
116
117 static void __init falconide_setup_ports(struct ide_hw *hw)
118 {
119 int i;
120
121 memset(hw, 0, sizeof(*hw));
122
123 hw->io_ports.data_addr = ATA_HD_BASE;
124
125 for (i = 1; i < 8; i++)
126 hw->io_ports_array[i] = ATA_HD_BASE + 1 + i * 4;
127
128 hw->io_ports.ctl_addr = ATA_HD_BASE + ATA_HD_CONTROL;
129
130 hw->irq = IRQ_MFP_IDE;
131 }
132
133 /*
134 * Probe for a Falcon IDE interface
135 */
136
137 static int __init falconide_init(void)
138 {
139 struct ide_host *host;
140 struct ide_hw hw, *hws[] = { &hw };
141 int rc;
142
143 if (!MACH_IS_ATARI || !ATARIHW_PRESENT(IDE))
144 return -ENODEV;
145
146 printk(KERN_INFO "ide: Falcon IDE controller\n");
147
148 if (!request_mem_region(ATA_HD_BASE, 0x40, DRV_NAME)) {
149 printk(KERN_ERR "%s: resources busy\n", DRV_NAME);
150 return -EBUSY;
151 }
152
153 falconide_setup_ports(&hw);
154
155 host = ide_host_alloc(&falconide_port_info, hws, 1);
156 if (host == NULL) {
157 rc = -ENOMEM;
158 goto err;
159 }
160
161 falconide_get_lock(NULL, NULL);
162 rc = ide_host_register(host, &falconide_port_info, hws);
163 falconide_release_lock();
164
165 if (rc)
166 goto err_free;
167
168 return 0;
169 err_free:
170 ide_host_free(host);
171 err:
172 release_mem_region(ATA_HD_BASE, 0x40);
173 return rc;
174 }
175
176 module_init(falconide_init);
177
178 MODULE_LICENSE("GPL");
179
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