]> nv-tegra.nvidia Code Review - linux-2.6.git/blob - drivers/tc/tc.c
Deal with the bloody KSEG vs CKSEG horror...
[linux-2.6.git] / drivers / tc / tc.c
1 /*
2  * tc-init: We assume the TURBOchannel to be up and running so
3  * just probe for Modules and fill in the global data structure
4  * tc_bus.
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
8  * for more details.
9  *
10  * Copyright (c) Harald Koerfgen, 1998
11  * Copyright (c) 2001, 2003  Maciej W. Rozycki
12  */
13 #include <linux/string.h>
14 #include <linux/init.h>
15 #include <linux/ioport.h>
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18
19 #include <asm/addrspace.h>
20 #include <asm/errno.h>
21 #include <asm/dec/machtype.h>
22 #include <asm/dec/prom.h>
23 #include <asm/dec/tcinfo.h>
24 #include <asm/dec/tcmodule.h>
25 #include <asm/dec/interrupts.h>
26 #include <asm/paccess.h>
27 #include <asm/ptrace.h>
28
29 #define TC_DEBUG
30
31 MODULE_LICENSE("GPL");
32 slot_info tc_bus[MAX_SLOT];
33 static int num_tcslots;
34 static tcinfo *info;
35
36 unsigned long system_base;
37
38 /*
39  * Interface to the world. Read comment in include/asm-mips/tc.h.
40  */
41
42 int search_tc_card(const char *name)
43 {
44         int slot;
45         slot_info *sip;
46
47         for (slot = 0; slot < num_tcslots; slot++) {
48                 sip = &tc_bus[slot];
49                 if ((sip->flags & FREE) &&
50                     (strncmp(sip->name, name, strlen(name)) == 0)) {
51                         return slot;
52                 }
53         }
54
55         return -ENODEV;
56 }
57
58 void claim_tc_card(int slot)
59 {
60         if (tc_bus[slot].flags & IN_USE) {
61                 printk("claim_tc_card: attempting to claim a card already in use\n");
62                 return;
63         }
64         tc_bus[slot].flags &= ~FREE;
65         tc_bus[slot].flags |= IN_USE;
66 }
67
68 void release_tc_card(int slot)
69 {
70         if (tc_bus[slot].flags & FREE) {
71                 printk("release_tc_card: "
72                        "attempting to release a card already free\n");
73                 return;
74         }
75         tc_bus[slot].flags &= ~IN_USE;
76         tc_bus[slot].flags |= FREE;
77 }
78
79 unsigned long get_tc_base_addr(int slot)
80 {
81         return tc_bus[slot].base_addr;
82 }
83
84 unsigned long get_tc_irq_nr(int slot)
85 {
86         return tc_bus[slot].interrupt;
87 }
88
89 unsigned long get_tc_speed(void)
90 {
91         return 100000 * (10000 / (unsigned long)info->clk_period);
92 }
93
94 /*
95  * Probing for TURBOchannel modules
96  */
97 static void __init tc_probe(unsigned long startaddr, unsigned long size,
98                             int slots)
99 {
100         int i, slot, err;
101         long offset;
102         unsigned char pattern[4];
103         unsigned char *module;
104
105         for (slot = 0; slot < slots; slot++) {
106                 module = (char *)(startaddr + slot * size);
107
108                 offset = OLDCARD;
109
110                 err = 0;
111                 err |= get_dbe(pattern[0], module + OLDCARD + TC_PATTERN0);
112                 err |= get_dbe(pattern[1], module + OLDCARD + TC_PATTERN1);
113                 err |= get_dbe(pattern[2], module + OLDCARD + TC_PATTERN2);
114                 err |= get_dbe(pattern[3], module + OLDCARD + TC_PATTERN3);
115                 if (err)
116                         continue;
117
118                 if (pattern[0] != 0x55 || pattern[1] != 0x00 ||
119                     pattern[2] != 0xaa || pattern[3] != 0xff) {
120                         offset = NEWCARD;
121
122                         err = 0;
123                         err |= get_dbe(pattern[0], module + TC_PATTERN0);
124                         err |= get_dbe(pattern[1], module + TC_PATTERN1);
125                         err |= get_dbe(pattern[2], module + TC_PATTERN2);
126                         err |= get_dbe(pattern[3], module + TC_PATTERN3);
127                         if (err)
128                                 continue;
129                 }
130
131                 if (pattern[0] != 0x55 || pattern[1] != 0x00 ||
132                     pattern[2] != 0xaa || pattern[3] != 0xff)
133                         continue;
134
135                 tc_bus[slot].base_addr = (unsigned long)module;
136                 for(i = 0; i < 8; i++) {
137                         tc_bus[slot].firmware[i] =
138                                 module[TC_FIRM_VER + offset + 4 * i];
139                         tc_bus[slot].vendor[i] =
140                                 module[TC_VENDOR + offset + 4 * i];
141                         tc_bus[slot].name[i] =
142                                 module[TC_MODULE + offset + 4 * i];
143                 }
144                 tc_bus[slot].firmware[8] = 0;
145                 tc_bus[slot].vendor[8] = 0;
146                 tc_bus[slot].name[8] = 0;
147                 /*
148                  * Looks unneccesary, but we may change
149                  * TC? in the future
150                  */
151                 switch (slot) {
152                 case 0:
153                         tc_bus[slot].interrupt = dec_interrupt[DEC_IRQ_TC0];
154                         break;
155                 case 1:
156                         tc_bus[slot].interrupt = dec_interrupt[DEC_IRQ_TC1];
157                         break;
158                 case 2:
159                         tc_bus[slot].interrupt = dec_interrupt[DEC_IRQ_TC2];
160                         break;
161                 /*
162                  * Yuck! DS5000/200 onboard devices
163                  */
164                 case 5:
165                         tc_bus[slot].interrupt = dec_interrupt[DEC_IRQ_TC5];
166                         break;
167                 case 6:
168                         tc_bus[slot].interrupt = dec_interrupt[DEC_IRQ_TC6];
169                         break;
170                 default:
171                         tc_bus[slot].interrupt = -1;
172                         break;
173                 }
174         }
175 }
176
177 /*
178  * the main entry
179  */
180 void __init tc_init(void)
181 {
182         int tc_clock;
183         int i;
184         unsigned long slot0addr;
185         unsigned long slot_size;
186
187         if (!TURBOCHANNEL)
188                 return;
189
190         for (i = 0; i < MAX_SLOT; i++) {
191                 tc_bus[i].base_addr = 0;
192                 tc_bus[i].name[0] = 0;
193                 tc_bus[i].vendor[0] = 0;
194                 tc_bus[i].firmware[0] = 0;
195                 tc_bus[i].interrupt = -1;
196                 tc_bus[i].flags = FREE;
197         }
198
199         info = (tcinfo *) rex_gettcinfo();
200         slot0addr = (unsigned long)CKSEG1ADDR(rex_slot_address(0));
201
202         switch (mips_machtype) {
203         case MACH_DS5000_200:
204                 num_tcslots = 7;
205                 break;
206         case MACH_DS5000_1XX:
207         case MACH_DS5000_2X0:
208         case MACH_DS5900:
209                 num_tcslots = 3;
210                 break;
211         case MACH_DS5000_XX:
212         default:
213                 num_tcslots = 2;
214                 break;
215         }
216
217         tc_clock = 10000 / info->clk_period;
218
219         if (TURBOCHANNEL && info->slot_size && slot0addr) {
220                 printk("TURBOchannel rev. %1d at %2d.%1d MHz ", info->revision,
221                         tc_clock / 10, tc_clock % 10);
222                 printk("(with%s parity)\n", info->parity ? "" : "out");
223
224                 slot_size = info->slot_size << 20;
225
226                 tc_probe(slot0addr, slot_size, num_tcslots);
227
228                 /*
229                  * All TURBOchannel DECstations have the onboard devices
230                  * where the (num_tcslots + 0 or 1 on DS5k/xx) Option Module
231                  * would be.
232                  */
233                 if(mips_machtype == MACH_DS5000_XX)
234                         i = 1;
235                 else
236                         i = 0;
237
238                 system_base = slot0addr + slot_size * (num_tcslots + i);
239
240 #ifdef TC_DEBUG
241                 for (i = 0; i < num_tcslots; i++)
242                         if (tc_bus[i].base_addr) {
243                                 printk("    slot %d: ", i);
244                                 printk("%s %s %s\n", tc_bus[i].vendor,
245                                         tc_bus[i].name, tc_bus[i].firmware);
246                         }
247 #endif
248         }
249 }
250
251 subsys_initcall(tc_init);
252
253 EXPORT_SYMBOL(search_tc_card);
254 EXPORT_SYMBOL(claim_tc_card);
255 EXPORT_SYMBOL(release_tc_card);
256 EXPORT_SYMBOL(get_tc_base_addr);
257 EXPORT_SYMBOL(get_tc_irq_nr);
258 EXPORT_SYMBOL(get_tc_speed);
259 EXPORT_SYMBOL(system_base);