Fedora kernel-2.6.17-1.2142_FC4 patched with stable patch-2.6.17.4-vs2.0.2-rc26.diff

[linux-2.6.git] / drivers / pcmcia / o2micro.h

diff --git a/drivers/pcmcia/o2micro.h b/drivers/pcmcia/o2micro.h
index f4ccd84..a234ce1 100644 (file)
--- a/drivers/pcmcia/o2micro.h
+++ b/drivers/pcmcia/o2micro.h
@@ -120,4 +120,65 @@
 #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;
+
+       if (PCI_FUNC(socket->dev->devfn) == 0) {
+               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:
+               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, 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);
+               }
+       }
+
+       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
+        */
+       o2micro_override(socket);
+}
+
 #endif /* _LINUX_O2MICRO_H */