tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * 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/types.h>
12#include <linux/mm.h>
13#include <linux/interrupt.h>
14#include <linux/blkdev.h>
15#include <linux/hdreg.h>
16#include <linux/ide.h>
17#include <linux/init.h>
18#include <linux/zorro.h>
19#include <linux/module.h>
20
21#include <asm/setup.h>
22#include <asm/amigahw.h>
23#include <asm/amigaints.h>
24#include <asm/amigayle.h>
25
26
27 /*
28 * Bases of the IDE interfaces
29 */
30
31#define GAYLE_BASE_4000 0xdd2020 /* A4000/A4000T */
32#define GAYLE_BASE_1200 0xda0000 /* A1200/A600 and E-Matrix 530 */
33
34 /*
35 * Offsets from one of the above bases
36 */
37
38#define GAYLE_CONTROL 0x101a
39
40 /*
41 * These are at different offsets from the base
42 */
43
44#define GAYLE_IRQ_4000 0xdd3020 /* MSB = 1, Harddisk is source of */
45#define GAYLE_IRQ_1200 0xda9000 /* interrupt */
46
47
48 /*
49 * Offset of the secondary port for IDE doublers
50 * Note that GAYLE_CONTROL is NOT available then!
51 */
52
53#define GAYLE_NEXT_PORT 0x1000
54
55#ifndef CONFIG_BLK_DEV_IDEDOUBLER
56#define GAYLE_NUM_HWIFS 1
57#define GAYLE_NUM_PROBE_HWIFS GAYLE_NUM_HWIFS
58#define GAYLE_HAS_CONTROL_REG 1
59#define GAYLE_IDEREG_SIZE 0x2000
60#else /* CONFIG_BLK_DEV_IDEDOUBLER */
61#define GAYLE_NUM_HWIFS 2
62#define GAYLE_NUM_PROBE_HWIFS (ide_doubler ? GAYLE_NUM_HWIFS : \
63 GAYLE_NUM_HWIFS-1)
64#define GAYLE_HAS_CONTROL_REG (!ide_doubler)
65#define GAYLE_IDEREG_SIZE (ide_doubler ? 0x1000 : 0x2000)
66
67int ide_doubler = 0; /* support IDE doublers? */
68EXPORT_SYMBOL_GPL(ide_doubler);
69
70module_param_named(doubler, ide_doubler, bool, 0);
71MODULE_PARM_DESC(doubler, "enable support for IDE doublers");
72#endif /* CONFIG_BLK_DEV_IDEDOUBLER */
73
74
75 /*
76 * Check and acknowledge the interrupt status
77 */
78
79static int gayle_ack_intr_a4000(ide_hwif_t *hwif)
80{
81 unsigned char ch;
82
83 ch = z_readb(hwif->io_ports.irq_addr);
84 if (!(ch & GAYLE_IRQ_IDE))
85 return 0;
86 return 1;
87}
88
89static int gayle_ack_intr_a1200(ide_hwif_t *hwif)
90{
91 unsigned char ch;
92
93 ch = z_readb(hwif->io_ports.irq_addr);
94 if (!(ch & GAYLE_IRQ_IDE))
95 return 0;
96 (void)z_readb(hwif->io_ports.status_addr);
97 z_writeb(0x7c, hwif->io_ports.irq_addr);
98 return 1;
99}
100
101static void __init gayle_setup_ports(hw_regs_t *hw, unsigned long base,
102 unsigned long ctl, unsigned long irq_port,
103 ide_ack_intr_t *ack_intr)
104{
105 int i;
106
107 memset(hw, 0, sizeof(*hw));
108
109 hw->io_ports.data_addr = base;
110
111 for (i = 1; i < 8; i++)
112 hw->io_ports_array[i] = base + 2 + i * 4;
113
114 hw->io_ports.ctl_addr = ctl;
115 hw->io_ports.irq_addr = irq_port;
116
117 hw->irq = IRQ_AMIGA_PORTS;
118 hw->ack_intr = ack_intr;
119
120 hw->chipset = ide_generic;
121}
122
123 /*
124 * Probe for a Gayle IDE interface (and optionally for an IDE doubler)
125 */
126
127static int __init gayle_init(void)
128{
129 int a4000, i;
130 u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
131
132 if (!MACH_IS_AMIGA)
133 return -ENODEV;
134
135 if ((a4000 = AMIGAHW_PRESENT(A4000_IDE)) || AMIGAHW_PRESENT(A1200_IDE))
136 goto found;
137
138#ifdef CONFIG_ZORRO
139 if (zorro_find_device(ZORRO_PROD_MTEC_VIPER_MK_V_E_MATRIX_530_SCSI_IDE,
140 NULL))
141 goto found;
142#endif
143 return -ENODEV;
144
145found:
146 printk(KERN_INFO "ide: Gayle IDE controller (A%d style%s)\n",
147 a4000 ? 4000 : 1200,
148#ifdef CONFIG_BLK_DEV_IDEDOUBLER
149 ide_doubler ? ", IDE doubler" :
150#endif
151 "");
152
153 for (i = 0; i < GAYLE_NUM_PROBE_HWIFS; i++) {
154 unsigned long base, ctrlport, irqport;
155 ide_ack_intr_t *ack_intr;
156 hw_regs_t hw;
157 ide_hwif_t *hwif;
158 unsigned long phys_base, res_start, res_n;
159
160 if (a4000) {
161 phys_base = GAYLE_BASE_4000;
162 irqport = (unsigned long)ZTWO_VADDR(GAYLE_IRQ_4000);
163 ack_intr = gayle_ack_intr_a4000;
164 } else {
165 phys_base = GAYLE_BASE_1200;
166 irqport = (unsigned long)ZTWO_VADDR(GAYLE_IRQ_1200);
167 ack_intr = gayle_ack_intr_a1200;
168 }
169/*
170 * FIXME: we now have selectable modes between mmio v/s iomio
171 */
172
173 phys_base += i*GAYLE_NEXT_PORT;
174
175 res_start = ((unsigned long)phys_base) & ~(GAYLE_NEXT_PORT-1);
176 res_n = GAYLE_IDEREG_SIZE;
177
178 if (!request_mem_region(res_start, res_n, "IDE"))
179 continue;
180
181 base = (unsigned long)ZTWO_VADDR(phys_base);
182 ctrlport = GAYLE_HAS_CONTROL_REG ? (base + GAYLE_CONTROL) : 0;
183
184 gayle_setup_ports(&hw, base, ctrlport, irqport, ack_intr);
185
186 hwif = ide_find_port();
187 if (hwif) {
188 u8 index = hwif->index;
189
190 ide_init_port_data(hwif, index);
191 ide_init_port_hw(hwif, &hw);
192
193 idx[i] = index;
194 } else
195 release_mem_region(res_start, res_n);
196 }
197
198 ide_device_add(idx, NULL);
199
200 return 0;
201}
202
203module_init(gayle_init);
204
205MODULE_LICENSE("GPL");