Pull percpu-dtc into release branch
[linux-2.6] / drivers / ide / legacy / buddha.c
1 /*
2  *  linux/drivers/ide/legacy/buddha.c -- 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     /*
61      *  Offsets from one of the above bases
62      */
63
64 #define BUDDHA_DATA     0x00
65 #define BUDDHA_ERROR    0x06            /* see err-bits */
66 #define BUDDHA_NSECTOR  0x0a            /* nr of sectors to read/write */
67 #define BUDDHA_SECTOR   0x0e            /* starting sector */
68 #define BUDDHA_LCYL     0x12            /* starting cylinder */
69 #define BUDDHA_HCYL     0x16            /* high byte of starting cyl */
70 #define BUDDHA_SELECT   0x1a            /* 101dhhhh , d=drive, hhhh=head */
71 #define BUDDHA_STATUS   0x1e            /* see status-bits */
72 #define BUDDHA_CONTROL  0x11a
73 #define XSURF_CONTROL   -1              /* X-Surf has no CS1* (Control/AltStat) */
74
75 static int buddha_offsets[IDE_NR_PORTS] __initdata = {
76     BUDDHA_DATA, BUDDHA_ERROR, BUDDHA_NSECTOR, BUDDHA_SECTOR, BUDDHA_LCYL,
77     BUDDHA_HCYL, BUDDHA_SELECT, BUDDHA_STATUS, BUDDHA_CONTROL, -1
78 };
79
80 static int xsurf_offsets[IDE_NR_PORTS] __initdata = {
81     BUDDHA_DATA, BUDDHA_ERROR, BUDDHA_NSECTOR, BUDDHA_SECTOR, BUDDHA_LCYL,
82     BUDDHA_HCYL, BUDDHA_SELECT, BUDDHA_STATUS, XSURF_CONTROL, -1
83 };
84
85     /*
86      *  Other registers
87      */
88
89 #define BUDDHA_IRQ1     0xf00           /* MSB = 1, Harddisk is source of */
90 #define BUDDHA_IRQ2     0xf40           /* interrupt */
91 #define BUDDHA_IRQ3     0xf80
92
93 #define XSURF_IRQ1      0x7e
94 #define XSURF_IRQ2      0x7e
95
96 static int buddha_irqports[CATWEASEL_NUM_HWIFS] __initdata = {
97     BUDDHA_IRQ1, BUDDHA_IRQ2, BUDDHA_IRQ3
98 };
99
100 static int xsurf_irqports[XSURF_NUM_HWIFS] __initdata = {
101     XSURF_IRQ1, XSURF_IRQ2
102 };
103
104 #define BUDDHA_IRQ_MR   0xfc0           /* master interrupt enable */
105
106
107     /*
108      *  Board information
109      */
110
111 typedef enum BuddhaType_Enum {
112     BOARD_BUDDHA, BOARD_CATWEASEL, BOARD_XSURF
113 } BuddhaType;
114
115
116     /*
117      *  Check and acknowledge the interrupt status
118      */
119
120 static int buddha_ack_intr(ide_hwif_t *hwif)
121 {
122     unsigned char ch;
123
124     ch = z_readb(hwif->io_ports[IDE_IRQ_OFFSET]);
125     if (!(ch & 0x80))
126             return 0;
127     return 1;
128 }
129
130 static int xsurf_ack_intr(ide_hwif_t *hwif)
131 {
132     unsigned char ch;
133
134     ch = z_readb(hwif->io_ports[IDE_IRQ_OFFSET]);
135     /* X-Surf needs a 0 written to IRQ register to ensure ISA bit A11 stays at 0 */
136     z_writeb(0, hwif->io_ports[IDE_IRQ_OFFSET]); 
137     if (!(ch & 0x80))
138             return 0;
139     return 1;
140 }
141
142     /*
143      *  Probe for a Buddha or Catweasel IDE interface
144      */
145
146 void __init buddha_init(void)
147 {
148         hw_regs_t hw;
149         ide_hwif_t *hwif;
150         int i, index;
151
152         struct zorro_dev *z = NULL;
153         u_long buddha_board = 0;
154         BuddhaType type;
155         int buddha_num_hwifs;
156
157         while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
158                 unsigned long board;
159                 if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_BUDDHA) {
160                         buddha_num_hwifs = BUDDHA_NUM_HWIFS;
161                         type=BOARD_BUDDHA;
162                 } else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_CATWEASEL) {
163                         buddha_num_hwifs = CATWEASEL_NUM_HWIFS;
164                         type=BOARD_CATWEASEL;
165                 } else if (z->id == ZORRO_PROD_INDIVIDUAL_COMPUTERS_X_SURF) {
166                         buddha_num_hwifs = XSURF_NUM_HWIFS;
167                         type=BOARD_XSURF;
168                 } else 
169                         continue;
170                 
171                 board = z->resource.start;
172
173 /*
174  * FIXME: we now have selectable mmio v/s iomio transports.
175  */
176
177                 if(type != BOARD_XSURF) {
178                         if (!request_mem_region(board+BUDDHA_BASE1, 0x800, "IDE"))
179                                 continue;
180                 } else {
181                         if (!request_mem_region(board+XSURF_BASE1, 0x1000, "IDE"))
182                                 continue;
183                         if (!request_mem_region(board+XSURF_BASE2, 0x1000, "IDE"))
184                                 goto fail_base2;
185                         if (!request_mem_region(board+XSURF_IRQ1, 0x8, "IDE")) {
186                                 release_mem_region(board+XSURF_BASE2, 0x1000);
187 fail_base2:
188                                 release_mem_region(board+XSURF_BASE1, 0x1000);
189                                 continue;
190                         }
191                 }         
192                 buddha_board = ZTWO_VADDR(board);
193                 
194                 /* write to BUDDHA_IRQ_MR to enable the board IRQ */
195                 /* X-Surf doesn't have this.  IRQs are always on */
196                 if (type != BOARD_XSURF)
197                         z_writeb(0, buddha_board+BUDDHA_IRQ_MR);
198                 
199                 for(i=0;i<buddha_num_hwifs;i++) {
200                         if(type != BOARD_XSURF) {
201                                 ide_setup_ports(&hw, (buddha_board+buddha_bases[i]),
202                                                 buddha_offsets, 0,
203                                                 (buddha_board+buddha_irqports[i]),
204                                                 buddha_ack_intr,
205 //                                              budda_iops,
206                                                 IRQ_AMIGA_PORTS);
207                         } else {
208                                 ide_setup_ports(&hw, (buddha_board+xsurf_bases[i]),
209                                                 xsurf_offsets, 0,
210                                                 (buddha_board+xsurf_irqports[i]),
211                                                 xsurf_ack_intr,
212 //                                              xsurf_iops,
213                                                 IRQ_AMIGA_PORTS);
214                         }       
215                         
216                         index = ide_register_hw(&hw, &hwif);
217                         if (index != -1) {
218                                 hwif->mmio = 1;
219                                 printk("ide%d: ", index);
220                                 switch(type) {
221                                 case BOARD_BUDDHA:
222                                         printk("Buddha");
223                                         break;
224                                 case BOARD_CATWEASEL:
225                                         printk("Catweasel");
226                                         break;
227                                 case BOARD_XSURF:
228                                         printk("X-Surf");
229                                         break;
230                                 }
231                                 printk(" IDE interface\n");         
232                         }                     
233                 }
234         }
235 }