Merge commit 'v2.6.26' into core/locking
[linux-2.6] / drivers / ide / legacy / 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/hdreg.h>
24 #include <linux/zorro.h>
25 #include <linux/ide.h>
26 #include <linux/init.h>
27
28 #include <asm/amigahw.h>
29 #include <asm/amigaints.h>
30
31
32     /*
33      *  The Buddha has 2 IDE interfaces, the Catweasel has 3, X-Surf has 2
34      */
35
36 #define BUDDHA_NUM_HWIFS        2
37 #define CATWEASEL_NUM_HWIFS     3
38 #define XSURF_NUM_HWIFS         2
39
40     /*
41      *  Bases of the IDE interfaces (relative to the board address)
42      */
43
44 #define BUDDHA_BASE1    0x800
45 #define BUDDHA_BASE2    0xa00
46 #define BUDDHA_BASE3    0xc00
47
48 #define XSURF_BASE1     0xb000 /* 2.5" Interface */
49 #define XSURF_BASE2     0xd000 /* 3.5" Interface */
50
51 static u_int buddha_bases[CATWEASEL_NUM_HWIFS] __initdata = {
52     BUDDHA_BASE1, BUDDHA_BASE2, BUDDHA_BASE3
53 };
54
55 static u_int xsurf_bases[XSURF_NUM_HWIFS] __initdata = {
56      XSURF_BASE1, XSURF_BASE2
57 };
58
59     /*
60      *  Offsets from one of the above bases
61      */
62
63 #define BUDDHA_CONTROL  0x11a
64
65     /*
66      *  Other registers
67      */
68
69 #define BUDDHA_IRQ1     0xf00           /* MSB = 1, Harddisk is source of */
70 #define BUDDHA_IRQ2     0xf40           /* interrupt */
71 #define BUDDHA_IRQ3     0xf80
72
73 #define XSURF_IRQ1      0x7e
74 #define XSURF_IRQ2      0x7e
75
76 static int buddha_irqports[CATWEASEL_NUM_HWIFS] __initdata = {
77     BUDDHA_IRQ1, BUDDHA_IRQ2, BUDDHA_IRQ3
78 };
79
80 static int xsurf_irqports[XSURF_NUM_HWIFS] __initdata = {
81     XSURF_IRQ1, XSURF_IRQ2
82 };
83
84 #define BUDDHA_IRQ_MR   0xfc0           /* master interrupt enable */
85
86
87     /*
88      *  Board information
89      */
90
91 typedef enum BuddhaType_Enum {
92     BOARD_BUDDHA, BOARD_CATWEASEL, BOARD_XSURF
93 } BuddhaType;
94
95 static const char *buddha_board_name[] = { "Buddha", "Catweasel", "X-Surf" };
96
97     /*
98      *  Check and acknowledge the interrupt status
99      */
100
101 static int buddha_ack_intr(ide_hwif_t *hwif)
102 {
103     unsigned char ch;
104
105     ch = z_readb(hwif->io_ports.irq_addr);
106     if (!(ch & 0x80))
107             return 0;
108     return 1;
109 }
110
111 static int xsurf_ack_intr(ide_hwif_t *hwif)
112 {
113     unsigned char ch;
114
115     ch = z_readb(hwif->io_ports.irq_addr);
116     /* X-Surf needs a 0 written to IRQ register to ensure ISA bit A11 stays at 0 */
117     z_writeb(0, hwif->io_ports.irq_addr);
118     if (!(ch & 0x80))
119             return 0;
120     return 1;
121 }
122
123 static void __init buddha_setup_ports(hw_regs_t *hw, unsigned long base,
124                                       unsigned long ctl, unsigned long irq_port,
125                                       ide_ack_intr_t *ack_intr)
126 {
127         int i;
128
129         memset(hw, 0, sizeof(*hw));
130
131         hw->io_ports.data_addr = base;
132
133         for (i = 1; i < 8; i++)
134                 hw->io_ports_array[i] = base + 2 + i * 4;
135
136         hw->io_ports.ctl_addr = ctl;
137         hw->io_ports.irq_addr = irq_port;
138
139         hw->irq = IRQ_AMIGA_PORTS;
140         hw->ack_intr = ack_intr;
141
142         hw->chipset = ide_generic;
143 }
144
145     /*
146      *  Probe for a Buddha or Catweasel IDE interface
147      */
148
149 static int __init buddha_init(void)
150 {
151         hw_regs_t hw;
152         ide_hwif_t *hwif;
153         int i;
154
155         struct zorro_dev *z = NULL;
156         u_long buddha_board = 0;
157         BuddhaType type;
158         int buddha_num_hwifs;
159
160         while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
161                 unsigned long board;
162                 u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
163
164                 if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_BUDDHA) {
165                         buddha_num_hwifs = BUDDHA_NUM_HWIFS;
166                         type=BOARD_BUDDHA;
167                 } else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_CATWEASEL) {
168                         buddha_num_hwifs = CATWEASEL_NUM_HWIFS;
169                         type=BOARD_CATWEASEL;
170                 } else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF) {
171                         buddha_num_hwifs = XSURF_NUM_HWIFS;
172                         type=BOARD_XSURF;
173                 } else 
174                         continue;
175                 
176                 board = z->resource.start;
177
178 /*
179  * FIXME: we now have selectable mmio v/s iomio transports.
180  */
181
182                 if(type != BOARD_XSURF) {
183                         if (!request_mem_region(board+BUDDHA_BASE1, 0x800, "IDE"))
184                                 continue;
185                 } else {
186                         if (!request_mem_region(board+XSURF_BASE1, 0x1000, "IDE"))
187                                 continue;
188                         if (!request_mem_region(board+XSURF_BASE2, 0x1000, "IDE"))
189                                 goto fail_base2;
190                         if (!request_mem_region(board+XSURF_IRQ1, 0x8, "IDE")) {
191                                 release_mem_region(board+XSURF_BASE2, 0x1000);
192 fail_base2:
193                                 release_mem_region(board+XSURF_BASE1, 0x1000);
194                                 continue;
195                         }
196                 }         
197                 buddha_board = ZTWO_VADDR(board);
198                 
199                 /* write to BUDDHA_IRQ_MR to enable the board IRQ */
200                 /* X-Surf doesn't have this.  IRQs are always on */
201                 if (type != BOARD_XSURF)
202                         z_writeb(0, buddha_board+BUDDHA_IRQ_MR);
203
204                 printk(KERN_INFO "ide: %s IDE controller\n",
205                                  buddha_board_name[type]);
206
207                 for (i = 0; i < buddha_num_hwifs; i++) {
208                         unsigned long base, ctl, irq_port;
209                         ide_ack_intr_t *ack_intr;
210
211                         if (type != BOARD_XSURF) {
212                                 base = buddha_board + buddha_bases[i];
213                                 ctl = base + BUDDHA_CONTROL;
214                                 irq_port = buddha_board + buddha_irqports[i];
215                                 ack_intr = buddha_ack_intr;
216                         } else {
217                                 base = buddha_board + xsurf_bases[i];
218                                 /* X-Surf has no CS1* (Control/AltStat) */
219                                 ctl = 0;
220                                 irq_port = buddha_board + xsurf_irqports[i];
221                                 ack_intr = xsurf_ack_intr;
222                         }
223
224                         buddha_setup_ports(&hw, base, ctl, irq_port, ack_intr);
225
226                         hwif = ide_find_port();
227                         if (hwif) {
228                                 u8 index = hwif->index;
229
230                                 ide_init_port_data(hwif, index);
231                                 ide_init_port_hw(hwif, &hw);
232
233                                 idx[i] = index;
234                         }
235                 }
236
237                 ide_device_add(idx, NULL);
238         }
239
240         return 0;
241 }
242
243 module_init(buddha_init);
244
245 MODULE_LICENSE("GPL");