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-rw-r--r--drivers/pcmcia/o2micro.h34
1 files changed, 27 insertions, 7 deletions
diff --git a/drivers/pcmcia/o2micro.h b/drivers/pcmcia/o2micro.h
index b1f6e3d9ee0..a234ce1967a 100644
--- a/drivers/pcmcia/o2micro.h
+++ b/drivers/pcmcia/o2micro.h
@@ -120,11 +120,16 @@
#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. chaning it to 0xCA (8 bit) enables
- * read prefetching which for example makes the RME Hammerfall DSP
+ * '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.
@@ -132,20 +137,35 @@ static int o2micro_override(struct yenta_socket *socket)
u8 a, b;
if (PCI_FUNC(socket->dev->devfn) == 0) {
- a = config_readb(socket, 0x94);
- b = config_readb(socket, 0xD4);
+ a = config_readb(socket, O2_RESERVED1);
+ b = config_readb(socket, O2_RESERVED2);
printk(KERN_INFO "Yenta O2: res at 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:
- printk(KERN_INFO "Yenta O2: old bridge, not enabling read prefetch / write burst\n");
+ case PCI_DEVICE_ID_O2_6836:
+ printk(KERN_INFO "Yenta O2: old bridge, disabling read prefetch/write burst\n");
+ config_writeb(socket, O2_RESERVED1,
+ a & ~(O2_RES_READ_PREFETCH | O2_RES_WRITE_BURST));
+ config_writeb(socket, O2_RESERVED2,
+ b & ~(O2_RES_READ_PREFETCH | O2_RES_WRITE_BURST));
break;
default:
printk(KERN_INFO "Yenta O2: enabling read prefetch/write burst\n");
- config_writeb(socket, 0x94, a | 0x0a);
- config_writeb(socket, 0xD4, b | 0x0a);
+ config_writeb(socket, O2_RESERVED1,
+ a | O2_RES_READ_PREFETCH | O2_RES_WRITE_BURST);
+ config_writeb(socket, O2_RESERVED2,
+ b | O2_RES_READ_PREFETCH | O2_RES_WRITE_BURST);
}
}