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[karo-tx-linux.git] / drivers / ide / buddha.c
1 /*
2  *  Amiga Buddha, Catweasel and X-Surf IDE Driver
3  *
4  *      Copyright (C) 1997, 2001 by Geert Uytterhoeven and others
5  *
6  *  This driver was written based on the specifications in README.buddha and
7  *  the X-Surf info from Inside_XSurf.txt available at
8  *  http://www.jschoenfeld.com
9  *
10  *  This file is subject to the terms and conditions of the GNU General Public
11  *  License.  See the file COPYING in the main directory of this archive for
12  *  more details.
13  *
14  *  TODO:
15  *    - test it :-)
16  *    - tune the timings using the speed-register
17  */
18
19 #include <linux/types.h>
20 #include <linux/mm.h>
21 #include <linux/interrupt.h>
22 #include <linux/blkdev.h>
23 #include <linux/zorro.h>
24 #include <linux/ide.h>
25 #include <linux/init.h>
26
27 #include <asm/amigahw.h>
28 #include <asm/amigaints.h>
29
30
31     /*
32      *  The Buddha has 2 IDE interfaces, the Catweasel has 3, X-Surf has 2
33      */
34
35 #define BUDDHA_NUM_HWIFS        2
36 #define CATWEASEL_NUM_HWIFS     3
37 #define XSURF_NUM_HWIFS         2
38
39 #define MAX_NUM_HWIFS           3
40
41     /*
42      *  Bases of the IDE interfaces (relative to the board address)
43      */
44
45 #define BUDDHA_BASE1    0x800
46 #define BUDDHA_BASE2    0xa00
47 #define BUDDHA_BASE3    0xc00
48
49 #define XSURF_BASE1     0xb000 /* 2.5" Interface */
50 #define XSURF_BASE2     0xd000 /* 3.5" Interface */
51
52 static u_int buddha_bases[CATWEASEL_NUM_HWIFS] __initdata = {
53     BUDDHA_BASE1, BUDDHA_BASE2, BUDDHA_BASE3
54 };
55
56 static u_int xsurf_bases[XSURF_NUM_HWIFS] __initdata = {
57      XSURF_BASE1, XSURF_BASE2
58 };
59
60     /*
61      *  Offsets from one of the above bases
62      */
63
64 #define BUDDHA_CONTROL  0x11a
65
66     /*
67      *  Other registers
68      */
69
70 #define BUDDHA_IRQ1     0xf00           /* MSB = 1, Harddisk is source of */
71 #define BUDDHA_IRQ2     0xf40           /* interrupt */
72 #define BUDDHA_IRQ3     0xf80
73
74 #define XSURF_IRQ1      0x7e
75 #define XSURF_IRQ2      0x7e
76
77 static int buddha_irqports[CATWEASEL_NUM_HWIFS] __initdata = {
78     BUDDHA_IRQ1, BUDDHA_IRQ2, BUDDHA_IRQ3
79 };
80
81 static int xsurf_irqports[XSURF_NUM_HWIFS] __initdata = {
82     XSURF_IRQ1, XSURF_IRQ2
83 };
84
85 #define BUDDHA_IRQ_MR   0xfc0           /* master interrupt enable */
86
87
88     /*
89      *  Board information
90      */
91
92 typedef enum BuddhaType_Enum {
93     BOARD_BUDDHA, BOARD_CATWEASEL, BOARD_XSURF
94 } BuddhaType;
95
96 static const char *buddha_board_name[] = { "Buddha", "Catweasel", "X-Surf" };
97
98     /*
99      *  Check and acknowledge the interrupt status
100      */
101
102 static int buddha_test_irq(ide_hwif_t *hwif)
103 {
104     unsigned char ch;
105
106     ch = z_readb(hwif->io_ports.irq_addr);
107     if (!(ch & 0x80))
108             return 0;
109     return 1;
110 }
111
112 static void xsurf_clear_irq(ide_drive_t *drive)
113 {
114     /*
115      * X-Surf needs 0 written to IRQ register to ensure ISA bit A11 stays at 0
116      */
117     z_writeb(0, drive->hwif->io_ports.irq_addr);
118 }
119
120 static void __init buddha_setup_ports(struct ide_hw *hw, unsigned long base,
121                                       unsigned long ctl, unsigned long irq_port)
122 {
123         int i;
124
125         memset(hw, 0, sizeof(*hw));
126
127         hw->io_ports.data_addr = base;
128
129         for (i = 1; i < 8; i++)
130                 hw->io_ports_array[i] = base + 2 + i * 4;
131
132         hw->io_ports.ctl_addr = ctl;
133         hw->io_ports.irq_addr = irq_port;
134
135         hw->irq = IRQ_AMIGA_PORTS;
136 }
137
138 static const struct ide_port_ops buddha_port_ops = {
139         .test_irq               = buddha_test_irq,
140 };
141
142 static const struct ide_port_ops xsurf_port_ops = {
143         .clear_irq              = xsurf_clear_irq,
144         .test_irq               = buddha_test_irq,
145 };
146
147 static const struct ide_port_info buddha_port_info = {
148         .port_ops               = &buddha_port_ops,
149         .host_flags             = IDE_HFLAG_MMIO | IDE_HFLAG_NO_DMA,
150         .irq_flags              = IRQF_SHARED,
151         .chipset                = ide_generic,
152 };
153
154     /*
155      *  Probe for a Buddha or Catweasel IDE interface
156      */
157
158 static int __init buddha_init(void)
159 {
160         struct zorro_dev *z = NULL;
161         u_long buddha_board = 0;
162         BuddhaType type;
163         int buddha_num_hwifs, i;
164
165         while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
166                 unsigned long board;
167                 struct ide_hw hw[MAX_NUM_HWIFS], *hws[MAX_NUM_HWIFS];
168                 struct ide_port_info d = buddha_port_info;
169
170                 if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_BUDDHA) {
171                         buddha_num_hwifs = BUDDHA_NUM_HWIFS;
172                         type=BOARD_BUDDHA;
173                 } else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_CATWEASEL) {
174                         buddha_num_hwifs = CATWEASEL_NUM_HWIFS;
175                         type=BOARD_CATWEASEL;
176                 } else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF) {
177                         buddha_num_hwifs = XSURF_NUM_HWIFS;
178                         type=BOARD_XSURF;
179                         d.port_ops = &xsurf_port_ops;
180                 } else 
181                         continue;
182                 
183                 board = z->resource.start;
184
185                 if(type != BOARD_XSURF) {
186                         if (!request_mem_region(board+BUDDHA_BASE1, 0x800, "IDE"))
187                                 continue;
188                 } else {
189                         if (!request_mem_region(board+XSURF_BASE1, 0x1000, "IDE"))
190                                 continue;
191                         if (!request_mem_region(board+XSURF_BASE2, 0x1000, "IDE"))
192                                 goto fail_base2;
193                         if (!request_mem_region(board+XSURF_IRQ1, 0x8, "IDE")) {
194                                 release_mem_region(board+XSURF_BASE2, 0x1000);
195 fail_base2:
196                                 release_mem_region(board+XSURF_BASE1, 0x1000);
197                                 continue;
198                         }
199                 }         
200                 buddha_board = ZTWO_VADDR(board);
201                 
202                 /* write to BUDDHA_IRQ_MR to enable the board IRQ */
203                 /* X-Surf doesn't have this.  IRQs are always on */
204                 if (type != BOARD_XSURF)
205                         z_writeb(0, buddha_board+BUDDHA_IRQ_MR);
206
207                 printk(KERN_INFO "ide: %s IDE controller\n",
208                                  buddha_board_name[type]);
209
210                 for (i = 0; i < buddha_num_hwifs; i++) {
211                         unsigned long base, ctl, irq_port;
212
213                         if (type != BOARD_XSURF) {
214                                 base = buddha_board + buddha_bases[i];
215                                 ctl = base + BUDDHA_CONTROL;
216                                 irq_port = buddha_board + buddha_irqports[i];
217                         } else {
218                                 base = buddha_board + xsurf_bases[i];
219                                 /* X-Surf has no CS1* (Control/AltStat) */
220                                 ctl = 0;
221                                 irq_port = buddha_board + xsurf_irqports[i];
222                         }
223
224                         buddha_setup_ports(&hw[i], base, ctl, irq_port);
225
226                         hws[i] = &hw[i];
227                 }
228
229                 ide_host_add(&d, hws, i, NULL);
230         }
231
232         return 0;
233 }
234
235 module_init(buddha_init);
236
237 MODULE_LICENSE("GPL");