1/*
2 * o2micro.h 1.13 1999/10/25 20:03:34
3 *
4 * The contents of this file are subject to the Mozilla Public License
5 * Version 1.1 (the "License"); you may not use this file except in
6 * compliance with the License. You may obtain a copy of the License
7 * at http://www.mozilla.org/MPL/
8 *
9 * Software distributed under the License is distributed on an "AS IS"
10 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
11 * the License for the specific language governing rights and
12 * limitations under the License.
13 *
14 * The initial developer of the original code is David A. Hinds
15 * <dahinds@users.sourceforge.net>. Portions created by David A. Hinds
16 * are Copyright (C) 1999 David A. Hinds. All Rights Reserved.
17 *
18 * Alternatively, the contents of this file may be used under the
19 * terms of the GNU General Public License version 2 (the "GPL"), in which
20 * case the provisions of the GPL are applicable instead of the
21 * above. If you wish to allow the use of your version of this file
22 * only under the terms of the GPL and not to allow others to use
23 * your version of this file under the MPL, indicate your decision by
24 * deleting the provisions above and replace them with the notice and
25 * other provisions required by the GPL. If you do not delete the
26 * provisions above, a recipient may use your version of this file
27 * under either the MPL or the GPL.
28 */
29
30#ifndef _LINUX_O2MICRO_H
31#define _LINUX_O2MICRO_H
32
33/* Additional PCI configuration registers */
34
35#define O2_MUX_CONTROL 0x90 /* 32 bit */
36#define O2_MUX_RING_OUT 0x0000000f
37#define O2_MUX_SKTB_ACTV 0x000000f0
38#define O2_MUX_SCTA_ACTV_ENA 0x00000100
39#define O2_MUX_SCTB_ACTV_ENA 0x00000200
40#define O2_MUX_SER_IRQ_ROUTE 0x0000e000
41#define O2_MUX_SER_PCI 0x00010000
42
43#define O2_MUX_SKTA_TURBO 0x000c0000 /* for 6833, 6860 */
44#define O2_MUX_SKTB_TURBO 0x00300000
45#define O2_MUX_AUX_VCC_3V 0x00400000
46#define O2_MUX_PCI_VCC_5V 0x00800000
47#define O2_MUX_PME_MUX 0x0f000000
48
49/* Additional ExCA registers */
50
51#define O2_MODE_A 0x38
52#define O2_MODE_A_2 0x26 /* for 6833B, 6860C */
53#define O2_MODE_A_CD_PULSE 0x04
54#define O2_MODE_A_SUSP_EDGE 0x08
55#define O2_MODE_A_HOST_SUSP 0x10
56#define O2_MODE_A_PWR_MASK 0x60
57#define O2_MODE_A_QUIET 0x80
58
59#define O2_MODE_B 0x39
60#define O2_MODE_B_2 0x2e /* for 6833B, 6860C */
61#define O2_MODE_B_IDENT 0x03
62#define O2_MODE_B_ID_BSTEP 0x00
63#define O2_MODE_B_ID_CSTEP 0x01
64#define O2_MODE_B_ID_O2 0x02
65#define O2_MODE_B_VS1 0x04
66#define O2_MODE_B_VS2 0x08
67#define O2_MODE_B_IRQ15_RI 0x80
68
69#define O2_MODE_C 0x3a
70#define O2_MODE_C_DREQ_MASK 0x03
71#define O2_MODE_C_DREQ_INPACK 0x01
72#define O2_MODE_C_DREQ_WP 0x02
73#define O2_MODE_C_DREQ_BVD2 0x03
74#define O2_MODE_C_ZVIDEO 0x08
75#define O2_MODE_C_IREQ_SEL 0x30
76#define O2_MODE_C_MGMT_SEL 0xc0
77
78#define O2_MODE_D 0x3b
79#define O2_MODE_D_IRQ_MODE 0x03
80#define O2_MODE_D_PCI_CLKRUN 0x04
81#define O2_MODE_D_CB_CLKRUN 0x08
82#define O2_MODE_D_SKT_ACTV 0x20
83#define O2_MODE_D_PCI_FIFO 0x40 /* for OZ6729, OZ6730 */
84#define O2_MODE_D_W97_IRQ 0x40
85#define O2_MODE_D_ISA_IRQ 0x80
86
87#define O2_MHPG_DMA 0x3c
88#define O2_MHPG_CHANNEL 0x07
89#define O2_MHPG_CINT_ENA 0x08
90#define O2_MHPG_CSC_ENA 0x10
91
92#define O2_FIFO_ENA 0x3d
93#define O2_FIFO_ZVIDEO_3 0x08
94#define O2_FIFO_PCI_FIFO 0x10
95#define O2_FIFO_POSTWR 0x40
96#define O2_FIFO_BUFFER 0x80
97
98#define O2_MODE_E 0x3e
99#define O2_MODE_E_MHPG_DMA 0x01
100#define O2_MODE_E_SPKR_OUT 0x02
101#define O2_MODE_E_LED_OUT 0x08
102#define O2_MODE_E_SKTA_ACTV 0x10
103
104#define O2_RESERVED1 0x94
105#define O2_RESERVED2 0xD4
106#define O2_RES_READ_PREFETCH 0x02
107#define O2_RES_WRITE_BURST 0x08
108
109static int o2micro_override(struct yenta_socket *socket)
110{
111 /*
112 * 'reserved' register at 0x94/D4. allows setting read prefetch and write
113 * bursting. read prefetching for example makes the RME Hammerfall DSP
114 * working. for some bridges it is at 0x94, for others at 0xD4. it's
115 * ok to write to both registers on all O2 bridges.
116 * from Eric Still, 02Micro.
117 */
118 u8 a, b;
119 bool use_speedup;
120
121 if (PCI_FUNC(socket->dev->devfn) == 0) {
122 a = config_readb(socket, O2_RESERVED1);
123 b = config_readb(socket, O2_RESERVED2);
124 dev_dbg(&socket->dev->dev, "O2: 0x94/0xD4: %02x/%02x\n", a, b);
125
126 switch (socket->dev->device) {
127 /*
128 * older bridges have problems with both read prefetch and write
129 * bursting depending on the combination of the chipset, bridge
130 * and the cardbus card. so disable them to be on the safe side.
131 */
132 case PCI_DEVICE_ID_O2_6729:
133 case PCI_DEVICE_ID_O2_6730:
134 case PCI_DEVICE_ID_O2_6812:
135 case PCI_DEVICE_ID_O2_6832:
136 case PCI_DEVICE_ID_O2_6836:
137 case PCI_DEVICE_ID_O2_6933:
138 use_speedup = false;
139 break;
140 default:
141 use_speedup = true;
142 break;
143 }
144
145 /* the user may override our decision */
146 if (strcasecmp(o2_speedup, "on") == 0)
147 use_speedup = true;
148 else if (strcasecmp(o2_speedup, "off") == 0)
149 use_speedup = false;
150 else if (strcasecmp(o2_speedup, "default") != 0)
151 dev_warn(&socket->dev->dev,
152 "O2: Unknown parameter, using 'default'");
153
154 if (use_speedup) {
155 dev_info(&socket->dev->dev,
156 "O2: enabling read prefetch/write burst. If you experience problems or performance issues, use the yenta_socket parameter 'o2_speedup=off'\n");
157 config_writeb(socket, O2_RESERVED1,
158 a | O2_RES_READ_PREFETCH | O2_RES_WRITE_BURST);
159 config_writeb(socket, O2_RESERVED2,
160 b | O2_RES_READ_PREFETCH | O2_RES_WRITE_BURST);
161 } else {
162 dev_info(&socket->dev->dev,
163 "O2: disabling read prefetch/write burst. If you experience problems or performance issues, use the yenta_socket parameter 'o2_speedup=on'\n");
164 config_writeb(socket, O2_RESERVED1,
165 a & ~(O2_RES_READ_PREFETCH | O2_RES_WRITE_BURST));
166 config_writeb(socket, O2_RESERVED2,
167 b & ~(O2_RES_READ_PREFETCH | O2_RES_WRITE_BURST));
168 }
169 }
170
171 return 0;
172}
173
174static void o2micro_restore_state(struct yenta_socket *socket)
175{
176 /*
177 * as long as read prefetch is the only thing in
178 * o2micro_override, it's safe to call it from here
179 */
180 o2micro_override(socket);
181}
182
183#endif /* _LINUX_O2MICRO_H */
184