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/ide.h>
16#include <linux/init.h>
17#include <linux/zorro.h>
18#include <linux/module.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 and E-Matrix 530 */
32
33#define GAYLE_IDEREG_SIZE 0x2000
34
35 /*
36 * Offsets from one of the above bases
37 */
38
39#define GAYLE_CONTROL 0x101a
40
41 /*
42 * These are at different offsets from the base
43 */
44
45#define GAYLE_IRQ_4000 0xdd3020 /* MSB = 1, Harddisk is source of */
46#define GAYLE_IRQ_1200 0xda9000 /* interrupt */
47
48
49 /*
50 * Offset of the secondary port for IDE doublers
51 * Note that GAYLE_CONTROL is NOT available then!
52 */
53
54#define GAYLE_NEXT_PORT 0x1000
55
56#ifndef CONFIG_BLK_DEV_IDEDOUBLER
57#define GAYLE_NUM_HWIFS 1
58#define GAYLE_NUM_PROBE_HWIFS GAYLE_NUM_HWIFS
59#define GAYLE_HAS_CONTROL_REG 1
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
66static int ide_doubler;
67module_param_named(doubler, ide_doubler, bool, 0);
68MODULE_PARM_DESC(doubler, "enable support for IDE doublers");
69#endif /* CONFIG_BLK_DEV_IDEDOUBLER */
70
71
72 /*
73 * Check and acknowledge the interrupt status
74 */
75
76static int gayle_ack_intr_a4000(ide_hwif_t *hwif)
77{
78 unsigned char ch;
79
80 ch = z_readb(hwif->io_ports.irq_addr);
81 if (!(ch & GAYLE_IRQ_IDE))
82 return 0;
83 return 1;
84}
85
86static int gayle_ack_intr_a1200(ide_hwif_t *hwif)
87{
88 unsigned char ch;
89
90 ch = z_readb(hwif->io_ports.irq_addr);
91 if (!(ch & GAYLE_IRQ_IDE))
92 return 0;
93 (void)z_readb(hwif->io_ports.status_addr);
94 z_writeb(0x7c, hwif->io_ports.irq_addr);
95 return 1;
96}
97
98static void __init gayle_setup_ports(hw_regs_t *hw, unsigned long base,
99 unsigned long ctl, unsigned long irq_port,
100 ide_ack_intr_t *ack_intr)
101{
102 int i;
103
104 memset(hw, 0, sizeof(*hw));
105
106 hw->io_ports.data_addr = base;
107
108 for (i = 1; i < 8; i++)
109 hw->io_ports_array[i] = base + 2 + i * 4;
110
111 hw->io_ports.ctl_addr = ctl;
112 hw->io_ports.irq_addr = irq_port;
113
114 hw->irq = IRQ_AMIGA_PORTS;
115 hw->ack_intr = ack_intr;
116
117 hw->chipset = ide_generic;
118}
119
120 /*
121 * Probe for a Gayle IDE interface (and optionally for an IDE doubler)
122 */
123
124static int __init gayle_init(void)
125{
126 unsigned long phys_base, res_start, res_n;
127 unsigned long base, ctrlport, irqport;
128 ide_ack_intr_t *ack_intr;
129 int a4000, i, rc;
130 hw_regs_t hw[GAYLE_NUM_HWIFS], *hws[] = { NULL, NULL, NULL, NULL };
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 if (a4000) {
154 phys_base = GAYLE_BASE_4000;
155 irqport = (unsigned long)ZTWO_VADDR(GAYLE_IRQ_4000);
156 ack_intr = gayle_ack_intr_a4000;
157 } else {
158 phys_base = GAYLE_BASE_1200;
159 irqport = (unsigned long)ZTWO_VADDR(GAYLE_IRQ_1200);
160 ack_intr = gayle_ack_intr_a1200;
161 }
162/*
163 * FIXME: we now have selectable modes between mmio v/s iomio
164 */
165
166 res_start = ((unsigned long)phys_base) & ~(GAYLE_NEXT_PORT-1);
167 res_n = GAYLE_IDEREG_SIZE;
168
169 if (!request_mem_region(res_start, res_n, "IDE"))
170 return -EBUSY;
171
172 for (i = 0; i < GAYLE_NUM_PROBE_HWIFS; i++) {
173 base = (unsigned long)ZTWO_VADDR(phys_base + i * GAYLE_NEXT_PORT);
174 ctrlport = GAYLE_HAS_CONTROL_REG ? (base + GAYLE_CONTROL) : 0;
175
176 gayle_setup_ports(&hw[i], base, ctrlport, irqport, ack_intr);
177
178 hws[i] = &hw[i];
179 }
180
181 rc = ide_host_add(NULL, hws, NULL);
182 if (rc)
183 release_mem_region(res_start, res_n);
184
185 return rc;
186}
187
188module_init(gayle_init);
189
190MODULE_LICENSE("GPL");