aboutsummaryrefslogtreecommitdiffstats
path: root/sys/i386/pci/pcibios.c
blob: 049d6e77a057b134e7f44b3db425c9b2408d6589 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
/**************************************************************************
**
**  $Id: pcibios.c,v 2.0 94/07/10 15:53:31 wolf Rel $
**
**  #define   for pci-bus bios functions.
**
**-------------------------------------------------------------------------
**
**  Copyright (c) 1994	Wolfgang Stanglmeier, Koeln, Germany
**                             <wolf@dentaro.GUN.de>
**
**  This is a beta version - use with care.
**
**-------------------------------------------------------------------------
**
**  $Log:	pcibios.c,v $
**  Revision 2.0  94/07/10  15:53:31  wolf
**  FreeBSD release.
**  
**  Revision 1.0  94/06/07  20:02:20  wolf
**  Beta release.
**  
***************************************************************************
*/


#include "types.h"
#include "i386/isa/isa.h"
#include "i386/pci/pci.h"
#include "i386/pci/pcibios.h"


extern int printf();

static char pci_mode;

static char ident[] =
	"\n$Id: pcibios.c,v 2.0 94/07/10 15:53:31 wolf Rel $\n"
	"Copyright (c) 1994, Wolfgang Stanglmeier\n";


/*--------------------------------------------------------------------
**
**      Port access
**
**--------------------------------------------------------------------
**
**      @FREEBSD@    inl() and outl() functions are not defined
*/

#define	DIRTY

#ifdef DIRTY

#undef inl
#define inl(port) \
({ u_long data; \
	__asm __volatile("inl %1, %0": "=a" (data): "d" ((u_short)(port))); \
	data; })


#undef outl
#define outl(port, data) \
{__asm __volatile("outl %0, %1"::"a" ((u_long)(data)), "d" ((u_short)(port)));}


#undef inb
#define inb(port) \
({ u_char data; \
	__asm __volatile("inb %1, %0": "=a" (data): "d" ((u_short)(port))); \
	data; })


#undef outb
#define outb(port, data) \
{__asm __volatile("outb %0, %1"::"a" ((u_char)(data)), "d" ((u_short)(port)));}

#endif

/*--------------------------------------------------------------------
**
**      Determine configuration mode
**
**--------------------------------------------------------------------
*/


#define CONF1_ENABLE       0x80000000ul
#define CONF1_ADDR_PORT    0x0cf8
#define CONF1_DATA_PORT    0x0cfc


#define CONF2_ENABLE_PORT  0x0cf8
#define CONF2_FORWARD_PORT 0x0cfa


int pci_conf_mode (void)
{
	u_long result, oldval;

	/*---------------------------------------
	**      Configuration mode 1 ?
	**---------------------------------------
	*/

	oldval = inl (CONF1_ADDR_PORT);
	outl (CONF1_ADDR_PORT, CONF1_ENABLE);
	result = inl (CONF1_ADDR_PORT);
	outl (CONF1_ADDR_PORT, oldval);

	if (result == CONF1_ENABLE) {
		pci_mode = 1;
		return (1);
	};

	/*---------------------------------------
	**      Configuration mode 2 ?
	**---------------------------------------
	*/

	outb (CONF2_ENABLE_PORT,     0);
	outb (CONF2_FORWARD_PORT, 0);
	if (!inb (CONF2_ENABLE_PORT) && !inb (CONF2_FORWARD_PORT)) {
		pci_mode = 2;
		return (2);
	};

	/*---------------------------------------
	**      No PCI bus available.
	**---------------------------------------
	*/
	return (0);
}

/*--------------------------------------------------------------------
**
**      Build a pcitag from bus, device and function number
**
**--------------------------------------------------------------------
*/


pcici_t pcitag (unsigned char bus, 
		unsigned char device,
		unsigned char func)
{
	pcici_t tag;

	tag.cfg1 = 0;
	if (device >= 32) return tag;
	if (func   >=  8) return tag;

	switch (pci_mode) {

	case 1:
		tag.cfg1 = CONF1_ENABLE
			| (((u_long) bus   ) << 16ul)
			| (((u_long) device) << 11ul)
			| (((u_long) func  ) <<  8ul);
		break;
	case 2:
		if (device >= 16) break;
		tag.cfg2.port    = 0xc000 | (device << 8ul);
		tag.cfg2.enable  = 0xf1 | (func << 1ul);
		tag.cfg2.forward = bus;
		break;
	};
	return tag;
}

/*--------------------------------------------------------------------
**
**      Read register from configuration space.
**
**--------------------------------------------------------------------
*/


u_long pci_conf_read (pcici_t tag, u_long reg)
{
	u_long addr, data = 0;

	if (!tag.cfg1) return (0xfffffffful);

	switch (pci_mode) {

	case 1:
		addr = tag.cfg1 | reg & 0xfc;
#ifdef PCI_DEBUG
		printf ("pci_conf_read(1): addr=%x ", addr);
#endif
		outl (CONF1_ADDR_PORT, addr);
		data = inl (CONF1_DATA_PORT);
		outl (CONF1_ADDR_PORT, 0   );
		break;

	case 2:
		addr = tag.cfg2.port | reg & 0xfc;
#ifdef PCI_DEBUG
		printf ("pci_conf_read(2): addr=%x ", addr);
#endif
		outb (CONF2_ENABLE_PORT , tag.cfg2.enable );
		outb (CONF2_FORWARD_PORT, tag.cfg2.forward);

		data = inl ((u_short) addr);

		outb (CONF2_ENABLE_PORT,  0);
		outb (CONF2_FORWARD_PORT, 0);
		break;
	};

#ifdef PCI_DEBUG
	printf ("data=%x\n", data);
#endif

	return (data);
}

/*--------------------------------------------------------------------
**
**      Write register into configuration space.
**
**--------------------------------------------------------------------
*/


void pci_conf_write (pcici_t tag, u_long reg, u_long data)
{
	u_long addr;

	if (!tag.cfg1) return;

	switch (pci_mode) {

	case 1:
		addr = tag.cfg1 | reg & 0xfc;
#ifdef PCI_DEBUG
		printf ("pci_conf_write(1): addr=%x data=%x\n",
			addr, data);
#endif
		outl (CONF1_ADDR_PORT, addr);
		outl (CONF1_DATA_PORT, data);
		outl (CONF1_ADDR_PORT,   0 );
		break;

	case 2:
		addr = tag.cfg2.port | reg & 0xfc;
#ifdef PCI_DEBUG
		printf ("pci_conf_write(2): addr=%x data=%x\n",
			addr, data);
#endif
		outb (CONF2_ENABLE_PORT,  tag.cfg2.enable);
		outb (CONF2_FORWARD_PORT, tag.cfg2.forward);

		outl ((u_short) addr, data);

		outb (CONF2_ENABLE_PORT,  0);
		outb (CONF2_FORWARD_PORT, 0);
		break;
	};
}