1/*
2 *  linux/drivers/ide/legacy/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/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
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    /*
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
47static 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)
79int ide_doubler = 0;	/* support IDE doublers? */
80#endif /* CONFIG_BLK_DEV_IDEDOUBLER */
81
82
83    /*
84     *  Check and acknowledge the interrupt status
85     */
86
87static int gayle_ack_intr_a4000(ide_hwif_t *hwif)
88{
89    unsigned char ch;
90
91    ch = z_readb(hwif->io_ports[IDE_IRQ_OFFSET]);
92    if (!(ch & GAYLE_IRQ_IDE))
93	return 0;
94    return 1;
95}
96
97static int gayle_ack_intr_a1200(ide_hwif_t *hwif)
98{
99    unsigned char ch;
100
101    ch = z_readb(hwif->io_ports[IDE_IRQ_OFFSET]);
102    if (!(ch & GAYLE_IRQ_IDE))
103	return 0;
104    (void)z_readb(hwif->io_ports[IDE_STATUS_OFFSET]);
105    z_writeb(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
113void __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	goto found;
122
123#ifdef CONFIG_ZORRO
124    if (zorro_find_device(ZORRO_PROD_MTEC_VIPER_MK_V_E_MATRIX_530_SCSI_IDE,
125			  NULL))
126	goto found;
127#endif
128    return;
129
130found:
131    for (i = 0; i < GAYLE_NUM_PROBE_HWIFS; i++) {
132	unsigned long base, ctrlport, irqport;
133	ide_ack_intr_t *ack_intr;
134	hw_regs_t hw;
135	ide_hwif_t *hwif;
136	int index;
137	unsigned long phys_base, res_start, res_n;
138
139	if (a4000) {
140	    phys_base = GAYLE_BASE_4000;
141	    irqport = (unsigned long)ZTWO_VADDR(GAYLE_IRQ_4000);
142	    ack_intr = gayle_ack_intr_a4000;
143	} else {
144	    phys_base = GAYLE_BASE_1200;
145	    irqport = (unsigned long)ZTWO_VADDR(GAYLE_IRQ_1200);
146	    ack_intr = gayle_ack_intr_a1200;
147	}
148
149	phys_base += i*GAYLE_NEXT_PORT;
150
151	res_start = ((unsigned long)phys_base) & ~(GAYLE_NEXT_PORT-1);
152	res_n = GAYLE_IDEREG_SIZE;
153
154	if (!request_mem_region(res_start, res_n, "IDE"))
155	    continue;
156
157	base = (unsigned long)ZTWO_VADDR(phys_base);
158	ctrlport = GAYLE_HAS_CONTROL_REG ? (base + GAYLE_CONTROL) : 0;
159
160	ide_setup_ports(&hw, base, gayle_offsets,
161			ctrlport, irqport, ack_intr,
162//			&gayle_iops,
163			IRQ_AMIGA_PORTS);
164
165	index = ide_register_hw(&hw, 1, &hwif);
166	if (index != -1) {
167	    hwif->mmio = 1;
168	    switch (i) {
169		case 0:
170		    printk("ide%d: Gayle IDE interface (A%d style)\n", index,
171			   a4000 ? 4000 : 1200);
172		    break;
173#ifdef CONFIG_BLK_DEV_IDEDOUBLER
174		case 1:
175		    printk("ide%d: IDE doubler\n", index);
176		    break;
177#endif /* CONFIG_BLK_DEV_IDEDOUBLER */
178	    }
179	} else
180	    release_mem_region(res_start, res_n);
181    }
182}
183