Merge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-lguest-and-virtio
[linux-2.6] / 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
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
66 static int ide_doubler;
67 module_param_named(doubler, ide_doubler, bool, 0);
68 MODULE_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
76 static 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
86 static 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
98 static 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 static const struct ide_port_info gayle_port_info = {
121         .host_flags             = IDE_HFLAG_MMIO | IDE_HFLAG_SERIALIZE |
122                                   IDE_HFLAG_NO_DMA,
123         .irq_flags              = IRQF_SHARED,
124 };
125
126     /*
127      *  Probe for a Gayle IDE interface (and optionally for an IDE doubler)
128      */
129
130 static int __init gayle_init(void)
131 {
132     unsigned long phys_base, res_start, res_n;
133     unsigned long base, ctrlport, irqport;
134     ide_ack_intr_t *ack_intr;
135     int a4000, i, rc;
136     hw_regs_t hw[GAYLE_NUM_HWIFS], *hws[] = { NULL, NULL, NULL, NULL };
137
138     if (!MACH_IS_AMIGA)
139         return -ENODEV;
140
141     if ((a4000 = AMIGAHW_PRESENT(A4000_IDE)) || AMIGAHW_PRESENT(A1200_IDE))
142         goto found;
143
144 #ifdef CONFIG_ZORRO
145     if (zorro_find_device(ZORRO_PROD_MTEC_VIPER_MK_V_E_MATRIX_530_SCSI_IDE,
146                           NULL))
147         goto found;
148 #endif
149     return -ENODEV;
150
151 found:
152         printk(KERN_INFO "ide: Gayle IDE controller (A%d style%s)\n",
153                          a4000 ? 4000 : 1200,
154 #ifdef CONFIG_BLK_DEV_IDEDOUBLER
155                          ide_doubler ? ", IDE doubler" :
156 #endif
157                          "");
158
159         if (a4000) {
160             phys_base = GAYLE_BASE_4000;
161             irqport = (unsigned long)ZTWO_VADDR(GAYLE_IRQ_4000);
162             ack_intr = gayle_ack_intr_a4000;
163         } else {
164             phys_base = GAYLE_BASE_1200;
165             irqport = (unsigned long)ZTWO_VADDR(GAYLE_IRQ_1200);
166             ack_intr = gayle_ack_intr_a1200;
167         }
168
169         res_start = ((unsigned long)phys_base) & ~(GAYLE_NEXT_PORT-1);
170         res_n = GAYLE_IDEREG_SIZE;
171
172         if (!request_mem_region(res_start, res_n, "IDE"))
173                 return -EBUSY;
174
175     for (i = 0; i < GAYLE_NUM_PROBE_HWIFS; i++) {
176         base = (unsigned long)ZTWO_VADDR(phys_base + i * GAYLE_NEXT_PORT);
177         ctrlport = GAYLE_HAS_CONTROL_REG ? (base + GAYLE_CONTROL) : 0;
178
179         gayle_setup_ports(&hw[i], base, ctrlport, irqport, ack_intr);
180
181         hws[i] = &hw[i];
182     }
183
184     rc = ide_host_add(&gayle_port_info, hws, NULL);
185     if (rc)
186         release_mem_region(res_start, res_n);
187
188     return rc;
189 }
190
191 module_init(gayle_init);
192
193 MODULE_LICENSE("GPL");