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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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