File: /usr/src/linux/drivers/ide/buddha.c
1 /*
2 * linux/drivers/ide/buddha.c -- Amiga Buddha and Catweasel IDE Driver
3 *
4 * Copyright (C) 1997 by Geert Uytterhoeven
5 *
6 * This driver was written by based on the specifications in README.buddha.
7 *
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License. See the file COPYING in the main directory of this archive for
10 * more details.
11 *
12 * TODO:
13 * - test it :-)
14 * - tune the timings using the speed-register
15 */
16
17 #include <linux/types.h>
18 #include <linux/mm.h>
19 #include <linux/interrupt.h>
20 #include <linux/blkdev.h>
21 #include <linux/hdreg.h>
22 #include <linux/zorro.h>
23 #include <linux/ide.h>
24 #include <linux/init.h>
25
26 #include <asm/amigahw.h>
27 #include <asm/amigaints.h>
28
29
30 /*
31 * The Buddha has 2 IDE interfaces, the Catweasel has 3
32 */
33
34 #define BUDDHA_NUM_HWIFS 2
35 #define CATWEASEL_NUM_HWIFS 3
36
37
38 /*
39 * Bases of the IDE interfaces (relative to the board address)
40 */
41
42 #define BUDDHA_BASE1 0x800
43 #define BUDDHA_BASE2 0xa00
44 #define BUDDHA_BASE3 0xc00
45
46 static u_int buddha_bases[CATWEASEL_NUM_HWIFS] __initdata = {
47 BUDDHA_BASE1, BUDDHA_BASE2, BUDDHA_BASE3
48 };
49
50
51 /*
52 * Offsets from one of the above bases
53 */
54
55 #define BUDDHA_DATA 0x00
56 #define BUDDHA_ERROR 0x06 /* see err-bits */
57 #define BUDDHA_NSECTOR 0x0a /* nr of sectors to read/write */
58 #define BUDDHA_SECTOR 0x0e /* starting sector */
59 #define BUDDHA_LCYL 0x12 /* starting cylinder */
60 #define BUDDHA_HCYL 0x16 /* high byte of starting cyl */
61 #define BUDDHA_SELECT 0x1a /* 101dhhhh , d=drive, hhhh=head */
62 #define BUDDHA_STATUS 0x1e /* see status-bits */
63 #define BUDDHA_CONTROL 0x11a
64
65 static int buddha_offsets[IDE_NR_PORTS] __initdata = {
66 BUDDHA_DATA, BUDDHA_ERROR, BUDDHA_NSECTOR, BUDDHA_SECTOR, BUDDHA_LCYL,
67 BUDDHA_HCYL, BUDDHA_SELECT, BUDDHA_STATUS, BUDDHA_CONTROL
68 };
69
70
71 /*
72 * Other registers
73 */
74
75 #define BUDDHA_IRQ1 0xf00 /* MSB = 1, Harddisk is source of */
76 #define BUDDHA_IRQ2 0xf40 /* interrupt */
77 #define BUDDHA_IRQ3 0xf80
78
79 static int buddha_irqports[CATWEASEL_NUM_HWIFS] __initdata = {
80 BUDDHA_IRQ1, BUDDHA_IRQ2, BUDDHA_IRQ3
81 };
82
83 #define BUDDHA_IRQ_MR 0xfc0 /* master interrupt enable */
84
85
86 /*
87 * Board information
88 */
89
90 static u_long buddha_board;
91 static int buddha_num_hwifs = -1;
92
93
94 /*
95 * Check and acknowledge the interrupt status
96 */
97
98 static int buddha_ack_intr(ide_hwif_t *hwif)
99 {
100 unsigned char ch;
101
102 ch = inb(hwif->io_ports[IDE_IRQ_OFFSET]);
103 if (!(ch & 0x80))
104 return 0;
105 return 1;
106 }
107
108
109 /*
110 * Any Buddha or Catweasel boards present?
111 */
112
113 static int __init find_buddha(void)
114 {
115 struct zorro_dev *z = NULL;
116
117 buddha_num_hwifs = 0;
118 while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
119 unsigned long board;
120 if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_BUDDHA)
121 buddha_num_hwifs = BUDDHA_NUM_HWIFS;
122 else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_CATWEASEL)
123 buddha_num_hwifs = CATWEASEL_NUM_HWIFS;
124 else
125 continue;
126 board = z->resource.start;
127 if (!request_mem_region(board+BUDDHA_BASE1, 0x800, "IDE"))
128 continue;
129 buddha_board = ZTWO_VADDR(board);
130 /* write to BUDDHA_IRQ_MR to enable the board IRQ */
131 *(char *)(buddha_board+BUDDHA_IRQ_MR) = 0;
132 break;
133 }
134 return buddha_num_hwifs;
135 }
136
137
138 /*
139 * Probe for a Buddha or Catweasel IDE interface
140 * We support only _one_ of them, no multiple boards!
141 */
142
143 void __init buddha_init(void)
144 {
145 hw_regs_t hw;
146 int i, index;
147
148 if (buddha_num_hwifs < 0 && !find_buddha())
149 return;
150
151 for (i = 0; i < buddha_num_hwifs; i++) {
152 ide_setup_ports(&hw, (ide_ioreg_t)(buddha_board+buddha_bases[i]),
153 buddha_offsets, 0,
154 (ide_ioreg_t)(buddha_board+buddha_irqports[i]),
155 buddha_ack_intr, IRQ_AMIGA_PORTS);
156 index = ide_register_hw(&hw, NULL);
157 if (index != -1)
158 printk("ide%d: %s IDE interface\n", index,
159 buddha_num_hwifs == BUDDHA_NUM_HWIFS ? "Buddha" :
160 "Catweasel");
161 }
162 }
163