1 /*
2 * linux/drivers/ide/gayle.c -- Amiga Gayle IDE Driver
3 *
4 * Created 9 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/config.h>
12 #include <linux/types.h>
13 #include <linux/mm.h>
14 #include <linux/interrupt.h>
15 #include <linux/blkdev.h>
16 #include <linux/hdreg.h>
17 #include <linux/ide.h>
18 #include <linux/init.h>
19
20 #include <asm/setup.h>
21 #include <asm/amigahw.h>
22 #include <asm/amigaints.h>
23 #include <asm/amigayle.h>
24
25
26 /*
27 * Bases of the IDE interfaces
28 */
29
30 #define GAYLE_BASE_4000 0xdd2020 /* A4000/A4000T */
31 #define GAYLE_BASE_1200 0xda0000 /* A1200/A600 */
32
33 /*
34 * Offsets from one of the above bases
35 */
36
37 #define GAYLE_DATA 0x00
38 #define GAYLE_ERROR 0x06 /* see err-bits */
39 #define GAYLE_NSECTOR 0x0a /* nr of sectors to read/write */
40 #define GAYLE_SECTOR 0x0e /* starting sector */
41 #define GAYLE_LCYL 0x12 /* starting cylinder */
42 #define GAYLE_HCYL 0x16 /* high byte of starting cyl */
43 #define GAYLE_SELECT 0x1a /* 101dhhhh , d=drive, hhhh=head */
44 #define GAYLE_STATUS 0x1e /* see status-bits */
45 #define GAYLE_CONTROL 0x101a
46
47 static int gayle_offsets[IDE_NR_PORTS] __initdata = {
48 GAYLE_DATA, GAYLE_ERROR, GAYLE_NSECTOR, GAYLE_SECTOR, GAYLE_LCYL,
49 GAYLE_HCYL, GAYLE_SELECT, GAYLE_STATUS, -1, -1
50 };
51
52
53 /*
54 * These are at different offsets from the base
55 */
56
57 #define GAYLE_IRQ_4000 0xdd3020 /* MSB = 1, Harddisk is source of */
58 #define GAYLE_IRQ_1200 0xda9000 /* interrupt */
59
60
61 /*
62 * Offset of the secondary port for IDE doublers
63 * Note that GAYLE_CONTROL is NOT available then!
64 */
65
66 #define GAYLE_NEXT_PORT 0x1000
67
68 #ifndef CONFIG_BLK_DEV_IDEDOUBLER
69 #define GAYLE_NUM_HWIFS 1
70 #define GAYLE_NUM_PROBE_HWIFS GAYLE_NUM_HWIFS
71 #define GAYLE_HAS_CONTROL_REG 1
72 #define GAYLE_IDEREG_SIZE 0x2000
73 #else /* CONFIG_BLK_DEV_IDEDOUBLER */
74 #define GAYLE_NUM_HWIFS 2
75 #define GAYLE_NUM_PROBE_HWIFS (ide_doubler ? GAYLE_NUM_HWIFS : \
76 GAYLE_NUM_HWIFS-1)
77 #define GAYLE_HAS_CONTROL_REG (!ide_doubler)
78 #define GAYLE_IDEREG_SIZE (ide_doubler ? 0x1000 : 0x2000)
79 int ide_doubler = 0; /* support IDE doublers? */
80 #endif /* CONFIG_BLK_DEV_IDEDOUBLER */
81
82
83 /*
84 * Check and acknowledge the interrupt status
85 */
86
87 static int gayle_ack_intr_a4000(ide_hwif_t *hwif)
88 {
89 unsigned char ch;
90
91 ch = inb(hwif->io_ports[IDE_IRQ_OFFSET]);
92 if (!(ch & GAYLE_IRQ_IDE))
93 return 0;
94 return 1;
95 }
96
97 static int gayle_ack_intr_a1200(ide_hwif_t *hwif)
98 {
99 unsigned char ch;
100
101 ch = inb(hwif->io_ports[IDE_IRQ_OFFSET]);
102 if (!(ch & GAYLE_IRQ_IDE))
103 return 0;
104 (void)inb(hwif->io_ports[IDE_STATUS_OFFSET]);
105 outb(0x7c, hwif->io_ports[IDE_IRQ_OFFSET]);
106 return 1;
107 }
108
109 /*
110 * Probe for a Gayle IDE interface (and optionally for an IDE doubler)
111 */
112
113 void __init gayle_init(void)
114 {
115 int a4000, i;
116
117 if (!MACH_IS_AMIGA)
118 return;
119
120 if (!(a4000 = AMIGAHW_PRESENT(A4000_IDE)) && !AMIGAHW_PRESENT(A1200_IDE))
121 return;
122
123 for (i = 0; i < GAYLE_NUM_PROBE_HWIFS; i++) {
124 ide_ioreg_t base, ctrlport, irqport;
125 ide_ack_intr_t *ack_intr;
126 hw_regs_t hw;
127 int index;
128 unsigned long phys_base, res_start, res_n;
129
130 if (a4000) {
131 phys_base = GAYLE_BASE_4000;
132 irqport = (ide_ioreg_t)ZTWO_VADDR(GAYLE_IRQ_4000);
133 ack_intr = gayle_ack_intr_a4000;
134 } else {
135 phys_base = GAYLE_BASE_1200;
136 irqport = (ide_ioreg_t)ZTWO_VADDR(GAYLE_IRQ_1200);
137 ack_intr = gayle_ack_intr_a1200;
138 }
139 phys_base += i*GAYLE_NEXT_PORT;
140
141 res_start = ((unsigned long)phys_base) & ~(GAYLE_NEXT_PORT-1);
142 res_n = GAYLE_IDEREG_SIZE;
143
144 if (!request_mem_region(res_start, res_n, "IDE"))
145 continue;
146
147 base = (ide_ioreg_t)ZTWO_VADDR(phys_base);
148 ctrlport = GAYLE_HAS_CONTROL_REG ? (base + GAYLE_CONTROL) : 0;
149
150 ide_setup_ports(&hw, base, gayle_offsets,
151 ctrlport, irqport, ack_intr, IRQ_AMIGA_PORTS);
152
153 index = ide_register_hw(&hw, NULL);
154 if (index != -1) {
155 switch (i) {
156 case 0:
157 printk("ide%d: Gayle IDE interface (A%d style)\n", index,
158 a4000 ? 4000 : 1200);
159 break;
160 #ifdef CONFIG_BLK_DEV_IDEDOUBLER
161 case 1:
162 printk("ide%d: IDE doubler\n", index);
163 break;
164 #endif /* CONFIG_BLK_DEV_IDEDOUBLER */
165 }
166 } else
167 release_mem_region(res_start, res_n);
168
169 #if 1 /* TESTING */
170 if (i == 1) {
171 volatile u_short *addr = (u_short *)base;
172 u_short data;
173 printk("+++ Probing for IDE doubler... ");
174 *addr = 0xffff;
175 data = *addr;
176 printk("probe returned 0x%02x (PLEASE REPORT THIS!!)\n", data);
177 }
178 #endif /* TESTING */
179 }
180 }
181
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