8250.c: less than 2400 baud fix.
[linux-2.6.git] / drivers / ide / gayle.c
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
53 static bool ide_doubler;
54 module_param_named(doubler, ide_doubler, bool, 0);
55 MODULE_PARM_DESC(doubler, "enable support for IDE doublers");
56
57     /*
58      *  Check and acknowledge the interrupt status
59      */
60
61 static 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
71 static 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
79 static 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
97 static const struct ide_port_ops gayle_a4000_port_ops = {
98         .test_irq               = gayle_test_irq,
99 };
100
101 static const struct ide_port_ops gayle_a1200_port_ops = {
102         .clear_irq              = gayle_a1200_clear_irq,
103         .test_irq               = gayle_test_irq,
104 };
105
106 static 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
117 static 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 = pdev->dev.platform_data;
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
163 out:
164         release_mem_region(res->start, resource_size(res));
165         return error;
166 }
167
168 static 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
178 static 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
186 static int __init amiga_gayle_ide_init(void)
187 {
188         return platform_driver_probe(&amiga_gayle_ide_driver,
189                                      amiga_gayle_ide_probe);
190 }
191
192 module_init(amiga_gayle_ide_init);
193
194 static void __exit amiga_gayle_ide_exit(void)
195 {
196         platform_driver_unregister(&amiga_gayle_ide_driver);
197 }
198
199 module_exit(amiga_gayle_ide_exit);
200
201 MODULE_LICENSE("GPL");
202 MODULE_ALIAS("platform:amiga-gayle-ide");