gayle.c revision dca3983059a4481e4ae97bbf0ac4b4c21429e1a5 
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#define GAYLE_NUM_HWIFS		2
57#define GAYLE_NUM_PROBE_HWIFS	(ide_doubler ? GAYLE_NUM_HWIFS : \
58					       GAYLE_NUM_HWIFS-1)
59#define GAYLE_HAS_CONTROL_REG	(!ide_doubler)
60
61static int ide_doubler;
62module_param_named(doubler, ide_doubler, bool, 0);
63MODULE_PARM_DESC(doubler, "enable support for IDE doublers");
64
65    /*
66     *  Check and acknowledge the interrupt status
67     */
68
69static int gayle_ack_intr_a4000(ide_hwif_t *hwif)
70{
71    unsigned char ch;
72
73    ch = z_readb(hwif->io_ports.irq_addr);
74    if (!(ch & GAYLE_IRQ_IDE))
75	return 0;
76    return 1;
77}
78
79static int gayle_ack_intr_a1200(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    (void)z_readb(hwif->io_ports.status_addr);
87    z_writeb(0x7c, hwif->io_ports.irq_addr);
88    return 1;
89}
90
91static void __init gayle_setup_ports(hw_regs_t *hw, unsigned long base,
92				     unsigned long ctl, unsigned long irq_port,
93				     ide_ack_intr_t *ack_intr)
94{
95	int i;
96
97	memset(hw, 0, sizeof(*hw));
98
99	hw->io_ports.data_addr = base;
100
101	for (i = 1; i < 8; i++)
102		hw->io_ports_array[i] = base + 2 + i * 4;
103
104	hw->io_ports.ctl_addr = ctl;
105	hw->io_ports.irq_addr = irq_port;
106
107	hw->irq = IRQ_AMIGA_PORTS;
108	hw->ack_intr = ack_intr;
109}
110
111static const struct ide_port_info gayle_port_info = {
112	.host_flags		= IDE_HFLAG_MMIO | IDE_HFLAG_SERIALIZE |
113				  IDE_HFLAG_NO_DMA,
114	.irq_flags		= IRQF_SHARED,
115	.chipset		= ide_generic,
116};
117
118    /*
119     *  Probe for a Gayle IDE interface (and optionally for an IDE doubler)
120     */
121
122static int __init gayle_init(void)
123{
124    unsigned long phys_base, res_start, res_n;
125    unsigned long base, ctrlport, irqport;
126    ide_ack_intr_t *ack_intr;
127    int a4000, i, rc;
128    hw_regs_t hw[GAYLE_NUM_HWIFS], *hws[GAYLE_NUM_HWIFS];
129
130    if (!MACH_IS_AMIGA)
131	return -ENODEV;
132
133    if ((a4000 = AMIGAHW_PRESENT(A4000_IDE)) || AMIGAHW_PRESENT(A1200_IDE))
134	goto found;
135
136#ifdef CONFIG_ZORRO
137    if (zorro_find_device(ZORRO_PROD_MTEC_VIPER_MK_V_E_MATRIX_530_SCSI_IDE,
138			  NULL))
139	goto found;
140#endif
141    return -ENODEV;
142
143found:
144	printk(KERN_INFO "ide: Gayle IDE controller (A%d style%s)\n",
145			 a4000 ? 4000 : 1200,
146			 ide_doubler ? ", IDE doubler" : "");
147
148	if (a4000) {
149	    phys_base = GAYLE_BASE_4000;
150	    irqport = (unsigned long)ZTWO_VADDR(GAYLE_IRQ_4000);
151	    ack_intr = gayle_ack_intr_a4000;
152	} else {
153	    phys_base = GAYLE_BASE_1200;
154	    irqport = (unsigned long)ZTWO_VADDR(GAYLE_IRQ_1200);
155	    ack_intr = gayle_ack_intr_a1200;
156	}
157
158	res_start = ((unsigned long)phys_base) & ~(GAYLE_NEXT_PORT-1);
159	res_n = GAYLE_IDEREG_SIZE;
160
161	if (!request_mem_region(res_start, res_n, "IDE"))
162		return -EBUSY;
163
164    for (i = 0; i < GAYLE_NUM_PROBE_HWIFS; i++) {
165	base = (unsigned long)ZTWO_VADDR(phys_base + i * GAYLE_NEXT_PORT);
166	ctrlport = GAYLE_HAS_CONTROL_REG ? (base + GAYLE_CONTROL) : 0;
167
168	gayle_setup_ports(&hw[i], base, ctrlport, irqport, ack_intr);
169
170	hws[i] = &hw[i];
171    }
172
173    rc = ide_host_add(&gayle_port_info, hws, i, NULL);
174    if (rc)
175	release_mem_region(res_start, res_n);
176
177    return rc;
178}
179
180module_init(gayle_init);
181
182MODULE_LICENSE("GPL");
183