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#include <linux/platform_device.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     *  Offsets from one of the above bases
29     */
30
31#define GAYLE_CONTROL	0x101a
32
33    /*
34     *  These are at different offsets from the base
35     */
36
37#define GAYLE_IRQ_4000	0xdd3020	/* MSB = 1, Harddisk is source of */
38#define GAYLE_IRQ_1200	0xda9000	/* interrupt */
39
40
41    /*
42     *  Offset of the secondary port for IDE doublers
43     *  Note that GAYLE_CONTROL is NOT available then!
44     */
45
46#define GAYLE_NEXT_PORT	0x1000
47
48#define GAYLE_NUM_HWIFS		2
49#define GAYLE_NUM_PROBE_HWIFS	(ide_doubler ? GAYLE_NUM_HWIFS : \
50					       GAYLE_NUM_HWIFS-1)
51#define GAYLE_HAS_CONTROL_REG	(!ide_doubler)
52
53static bool ide_doubler;
54module_param_named(doubler, ide_doubler, bool, 0);
55MODULE_PARM_DESC(doubler, "enable support for IDE doublers");
56
57    /*
58     *  Check and acknowledge the interrupt status
59     */
60
61static int gayle_test_irq(ide_hwif_t *hwif)
62{
63	unsigned char ch;
64
65	ch = z_readb(hwif->io_ports.irq_addr);
66	if (!(ch & GAYLE_IRQ_IDE))
67		return 0;
68	return 1;
69}
70
71static void gayle_a1200_clear_irq(ide_drive_t *drive)
72{
73	ide_hwif_t *hwif = drive->hwif;
74
75	(void)z_readb(hwif->io_ports.status_addr);
76	z_writeb(0x7c, hwif->io_ports.irq_addr);
77}
78
79static void __init gayle_setup_ports(struct ide_hw *hw, unsigned long base,
80				     unsigned long ctl, unsigned long irq_port)
81{
82	int i;
83
84	memset(hw, 0, sizeof(*hw));
85
86	hw->io_ports.data_addr = base;
87
88	for (i = 1; i < 8; i++)
89		hw->io_ports_array[i] = base + 2 + i * 4;
90
91	hw->io_ports.ctl_addr = ctl;
92	hw->io_ports.irq_addr = irq_port;
93
94	hw->irq = IRQ_AMIGA_PORTS;
95}
96
97static const struct ide_port_ops gayle_a4000_port_ops = {
98	.test_irq		= gayle_test_irq,
99};
100
101static const struct ide_port_ops gayle_a1200_port_ops = {
102	.clear_irq		= gayle_a1200_clear_irq,
103	.test_irq		= gayle_test_irq,
104};
105
106static const struct ide_port_info gayle_port_info = {
107	.host_flags		= IDE_HFLAG_MMIO | IDE_HFLAG_SERIALIZE |
108				  IDE_HFLAG_NO_DMA,
109	.irq_flags		= IRQF_SHARED,
110	.chipset		= ide_generic,
111};
112
113    /*
114     *  Probe for a Gayle IDE interface (and optionally for an IDE doubler)
115     */
116
117static int __init amiga_gayle_ide_probe(struct platform_device *pdev)
118{
119	struct resource *res;
120	struct gayle_ide_platform_data *pdata;
121	unsigned long base, ctrlport, irqport;
122	unsigned int i;
123	int error;
124	struct ide_hw hw[GAYLE_NUM_HWIFS], *hws[GAYLE_NUM_HWIFS];
125	struct ide_port_info d = gayle_port_info;
126	struct ide_host *host;
127
128	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
129	if (!res)
130		return -ENODEV;
131
132	if (!request_mem_region(res->start, resource_size(res), "IDE"))
133		return -EBUSY;
134
135	pdata = dev_get_platdata(&pdev->dev);
136	pr_info("ide: Gayle IDE controller (A%u style%s)\n",
137		pdata->explicit_ack ? 1200 : 4000,
138		ide_doubler ? ", IDE doubler" : "");
139
140	base = (unsigned long)ZTWO_VADDR(pdata->base);
141	ctrlport = 0;
142	irqport = (unsigned long)ZTWO_VADDR(pdata->irqport);
143	if (pdata->explicit_ack)
144		d.port_ops = &gayle_a1200_port_ops;
145	else
146		d.port_ops = &gayle_a4000_port_ops;
147
148	for (i = 0; i < GAYLE_NUM_PROBE_HWIFS; i++, base += GAYLE_NEXT_PORT) {
149		if (GAYLE_HAS_CONTROL_REG)
150			ctrlport = base + GAYLE_CONTROL;
151
152		gayle_setup_ports(&hw[i], base, ctrlport, irqport);
153		hws[i] = &hw[i];
154	}
155
156	error = ide_host_add(&d, hws, i, &host);
157	if (error)
158		goto out;
159
160	platform_set_drvdata(pdev, host);
161	return 0;
162
163out:
164	release_mem_region(res->start, resource_size(res));
165	return error;
166}
167
168static int __exit amiga_gayle_ide_remove(struct platform_device *pdev)
169{
170	struct ide_host *host = platform_get_drvdata(pdev);
171	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
172
173	ide_host_remove(host);
174	release_mem_region(res->start, resource_size(res));
175	return 0;
176}
177
178static struct platform_driver amiga_gayle_ide_driver = {
179	.remove = __exit_p(amiga_gayle_ide_remove),
180	.driver   = {
181		.name	= "amiga-gayle-ide",
182		.owner	= THIS_MODULE,
183	},
184};
185
186module_platform_driver_probe(amiga_gayle_ide_driver, amiga_gayle_ide_probe);
187
188MODULE_LICENSE("GPL");
189MODULE_ALIAS("platform:amiga-gayle-ide");
190