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* o2micro.h 1.13 1999/10/25 20:03:34
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License
* at
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and
* limitations under the License.
* The initial developer of the original code is David A. Hinds
* <>. Portions created by David A. Hinds
* are Copyright (C) 1999 David A. Hinds. All Rights Reserved.
* Alternatively, the contents of this file may be used under the
* terms of the GNU General Public License version 2 (the "GPL"), in which
* case the provisions of the GPL are applicable instead of the
* above. If you wish to allow the use of your version of this file
* only under the terms of the GPL and not to allow others to use
* your version of this file under the MPL, indicate your decision by
* deleting the provisions above and replace them with the notice and
* other provisions required by the GPL. If you do not delete the
* provisions above, a recipient may use your version of this file
* under either the MPL or the GPL.
#ifndef _LINUX_O2MICRO_H
#define _LINUX_O2MICRO_H
/* Additional PCI configuration registers */
#define O2_MUX_CONTROL 0x90 /* 32 bit */
#define O2_MUX_RING_OUT 0x0000000f
#define O2_MUX_SKTB_ACTV 0x000000f0
#define O2_MUX_SCTA_ACTV_ENA 0x00000100
#define O2_MUX_SCTB_ACTV_ENA 0x00000200
#define O2_MUX_SER_IRQ_ROUTE 0x0000e000
#define O2_MUX_SER_PCI 0x00010000
#define O2_MUX_SKTA_TURBO 0x000c0000 /* for 6833, 6860 */
#define O2_MUX_SKTB_TURBO 0x00300000
#define O2_MUX_AUX_VCC_3V 0x00400000
#define O2_MUX_PCI_VCC_5V 0x00800000
#define O2_MUX_PME_MUX 0x0f000000
/* Additional ExCA registers */
#define O2_MODE_A 0x38
#define O2_MODE_A_2 0x26 /* for 6833B, 6860C */
#define O2_MODE_A_CD_PULSE 0x04
#define O2_MODE_A_SUSP_EDGE 0x08
#define O2_MODE_A_HOST_SUSP 0x10
#define O2_MODE_A_PWR_MASK 0x60
#define O2_MODE_A_QUIET 0x80
#define O2_MODE_B 0x39
#define O2_MODE_B_2 0x2e /* for 6833B, 6860C */
#define O2_MODE_B_IDENT 0x03
#define O2_MODE_B_ID_BSTEP 0x00
#define O2_MODE_B_ID_CSTEP 0x01
#define O2_MODE_B_ID_O2 0x02
#define O2_MODE_B_VS1 0x04
#define O2_MODE_B_VS2 0x08
#define O2_MODE_B_IRQ15_RI 0x80
#define O2_MODE_C 0x3a
#define O2_MODE_C_DREQ_MASK 0x03
#define O2_MODE_C_DREQ_INPACK 0x01
#define O2_MODE_C_DREQ_WP 0x02
#define O2_MODE_C_DREQ_BVD2 0x03
#define O2_MODE_C_ZVIDEO 0x08
#define O2_MODE_C_IREQ_SEL 0x30
#define O2_MODE_C_MGMT_SEL 0xc0
#define O2_MODE_D 0x3b
#define O2_MODE_D_IRQ_MODE 0x03
#define O2_MODE_D_PCI_CLKRUN 0x04
#define O2_MODE_D_CB_CLKRUN 0x08
#define O2_MODE_D_SKT_ACTV 0x20
#define O2_MODE_D_PCI_FIFO 0x40 /* for OZ6729, OZ6730 */
#define O2_MODE_D_W97_IRQ 0x40
#define O2_MODE_D_ISA_IRQ 0x80
#define O2_MHPG_DMA 0x3c
#define O2_MHPG_CHANNEL 0x07
#define O2_MHPG_CINT_ENA 0x08
#define O2_MHPG_CSC_ENA 0x10
#define O2_FIFO_ENA 0x3d
#define O2_FIFO_ZVIDEO_3 0x08
#define O2_FIFO_PCI_FIFO 0x10
#define O2_FIFO_POSTWR 0x40
#define O2_FIFO_BUFFER 0x80
#define O2_MODE_E 0x3e
#define O2_MODE_E_MHPG_DMA 0x01
#define O2_MODE_E_SPKR_OUT 0x02
#define O2_MODE_E_LED_OUT 0x08
#define O2_MODE_E_SKTA_ACTV 0x10
#define O2_RESERVED1 0x94
#define O2_RESERVED2 0xD4
#define O2_RES_READ_PREFETCH 0x02
#define O2_RES_WRITE_BURST 0x08
static int o2micro_override(struct yenta_socket *socket)
* 'reserved' register at 0x94/D4. allows setting read prefetch and write
* bursting. read prefetching for example makes the RME Hammerfall DSP
* working. for some bridges it is at 0x94, for others at 0xD4. it's
* ok to write to both registers on all O2 bridges.
* from Eric Still, 02Micro.
u8 a, b;
bool use_speedup;
if (PCI_FUNC(socket->dev->devfn) == 0) {
a = config_readb(socket, O2_RESERVED1);
b = config_readb(socket, O2_RESERVED2);
dev_dbg(&socket->dev->dev, "O2: 0x94/0xD4: %02x/%02x\n", a, b);
switch (socket->dev->device) {
* older bridges have problems with both read prefetch and write
* bursting depending on the combination of the chipset, bridge
* and the cardbus card. so disable them to be on the safe side.
case PCI_DEVICE_ID_O2_6729:
case PCI_DEVICE_ID_O2_6730:
case PCI_DEVICE_ID_O2_6812:
case PCI_DEVICE_ID_O2_6832:
case PCI_DEVICE_ID_O2_6836:
case PCI_DEVICE_ID_O2_6933:
use_speedup = false;
use_speedup = true;
/* the user may override our decision */
if (strcasecmp(o2_speedup, "on") == 0)
use_speedup = true;
else if (strcasecmp(o2_speedup, "off") == 0)
use_speedup = false;
else if (strcasecmp(o2_speedup, "default") != 0)
"O2: Unknown parameter, using 'default'");
if (use_speedup) {
"O2: enabling read prefetch/write burst. If you experience problems or performance issues, use the yenta_socket parameter 'o2_speedup=off'\n");
config_writeb(socket, O2_RESERVED1,
config_writeb(socket, O2_RESERVED2,
} else {
"O2: disabling read prefetch/write burst. If you experience problems or performance issues, use the yenta_socket parameter 'o2_speedup=on'\n");
config_writeb(socket, O2_RESERVED1,
config_writeb(socket, O2_RESERVED2,
return 0;
static void o2micro_restore_state(struct yenta_socket *socket)
* as long as read prefetch is the only thing in
* o2micro_override, it's safe to call it from here
#endif /* _LINUX_O2MICRO_H */