Merge commit 'v2.6.28-rc2' into topic/asoc
[linux-2.6] / 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_ack_intr(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 int xsurf_ack_intr(ide_hwif_t *hwif)
113 {
114     unsigned char ch;
115
116     ch = z_readb(hwif->io_ports.irq_addr);
117     /* X-Surf needs a 0 written to IRQ register to ensure ISA bit A11 stays at 0 */
118     z_writeb(0, hwif->io_ports.irq_addr);
119     if (!(ch & 0x80))
120             return 0;
121     return 1;
122 }
123
124 static void __init buddha_setup_ports(hw_regs_t *hw, unsigned long base,
125                                       unsigned long ctl, unsigned long irq_port,
126                                       ide_ack_intr_t *ack_intr)
127 {
128         int i;
129
130         memset(hw, 0, sizeof(*hw));
131
132         hw->io_ports.data_addr = base;
133
134         for (i = 1; i < 8; i++)
135                 hw->io_ports_array[i] = base + 2 + i * 4;
136
137         hw->io_ports.ctl_addr = ctl;
138         hw->io_ports.irq_addr = irq_port;
139
140         hw->irq = IRQ_AMIGA_PORTS;
141         hw->ack_intr = ack_intr;
142
143         hw->chipset = ide_generic;
144 }
145
146     /*
147      *  Probe for a Buddha or Catweasel IDE interface
148      */
149
150 static int __init buddha_init(void)
151 {
152         struct zorro_dev *z = NULL;
153         u_long buddha_board = 0;
154         BuddhaType type;
155         int buddha_num_hwifs, i;
156
157         while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
158                 unsigned long board;
159                 hw_regs_t hw[MAX_NUM_HWIFS], *hws[] = { NULL, NULL, NULL, NULL };
160
161                 if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_BUDDHA) {
162                         buddha_num_hwifs = BUDDHA_NUM_HWIFS;
163                         type=BOARD_BUDDHA;
164                 } else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_CATWEASEL) {
165                         buddha_num_hwifs = CATWEASEL_NUM_HWIFS;
166                         type=BOARD_CATWEASEL;
167                 } else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF) {
168                         buddha_num_hwifs = XSURF_NUM_HWIFS;
169                         type=BOARD_XSURF;
170                 } else 
171                         continue;
172                 
173                 board = z->resource.start;
174
175 /*
176  * FIXME: we now have selectable mmio v/s iomio transports.
177  */
178
179                 if(type != BOARD_XSURF) {
180                         if (!request_mem_region(board+BUDDHA_BASE1, 0x800, "IDE"))
181                                 continue;
182                 } else {
183                         if (!request_mem_region(board+XSURF_BASE1, 0x1000, "IDE"))
184                                 continue;
185                         if (!request_mem_region(board+XSURF_BASE2, 0x1000, "IDE"))
186                                 goto fail_base2;
187                         if (!request_mem_region(board+XSURF_IRQ1, 0x8, "IDE")) {
188                                 release_mem_region(board+XSURF_BASE2, 0x1000);
189 fail_base2:
190                                 release_mem_region(board+XSURF_BASE1, 0x1000);
191                                 continue;
192                         }
193                 }         
194                 buddha_board = ZTWO_VADDR(board);
195                 
196                 /* write to BUDDHA_IRQ_MR to enable the board IRQ */
197                 /* X-Surf doesn't have this.  IRQs are always on */
198                 if (type != BOARD_XSURF)
199                         z_writeb(0, buddha_board+BUDDHA_IRQ_MR);
200
201                 printk(KERN_INFO "ide: %s IDE controller\n",
202                                  buddha_board_name[type]);
203
204                 for (i = 0; i < buddha_num_hwifs; i++) {
205                         unsigned long base, ctl, irq_port;
206                         ide_ack_intr_t *ack_intr;
207
208                         if (type != BOARD_XSURF) {
209                                 base = buddha_board + buddha_bases[i];
210                                 ctl = base + BUDDHA_CONTROL;
211                                 irq_port = buddha_board + buddha_irqports[i];
212                                 ack_intr = buddha_ack_intr;
213                         } else {
214                                 base = buddha_board + xsurf_bases[i];
215                                 /* X-Surf has no CS1* (Control/AltStat) */
216                                 ctl = 0;
217                                 irq_port = buddha_board + xsurf_irqports[i];
218                                 ack_intr = xsurf_ack_intr;
219                         }
220
221                         buddha_setup_ports(&hw[i], base, ctl, irq_port,
222                                            ack_intr);
223
224                         hws[i] = &hw[i];
225                 }
226
227                 ide_host_add(NULL, hws, NULL);
228         }
229
230         return 0;
231 }
232
233 module_init(buddha_init);
234
235 MODULE_LICENSE("GPL");