Source: MontaVista Software, Inc. Sergey Podstavin <spodstavin@xxxxxxxxxxxxx>
MR: 17133
Type: Enhancement
Disposition: needs submitting to linuxmips-embedded mailing list
Signed-off-by: Sergey Podstavin <spodstavin@xxxxxxxxxxxxx>
Description:
NEC Vr5701 workaround. Basically,it gives the following workaround:
Restriction no.1:
Please set the value 1 in DISCTIM field of the IPCI_CTRL-L
register of IPCIC (or the EPCI_CTRL-L register of EPCIC).
Restriction no.2:
Please clear SERREN bit of the PCICMD register of IDEC.
Restriction no.6:
Please clear PREFETCHABLE bit of the IP_BAR_MEM01 register
of IPCIC (or the EP_BAR_MEM01 register of EPCIC).
Index: linux-2.6.10/arch/mips/vr5701/vr5701_sg2/setup.c
===================================================================
--- linux-2.6.10.orig/arch/mips/vr5701/vr5701_sg2/setup.c
+++ linux-2.6.10/arch/mips/vr5701/vr5701_sg2/setup.c
@@ -98,7 +98,7 @@ static void __init vr5701_sg2_board_init
/* ------------ reset PCI bus and BARs ----------------- */
ddb_pci_reset_bus();
/* Ext. PCI memory space */
- ddb_out32(PCI_BAR_MEM01, 0x00000008);
+ ddb_out32(PCI_BAR_MEM01, 0x00000000); /* workaround - Restriction no.6 */
ddb_out8(PCI_MLTIM, 0x40);
ddb_out32(PCI_BAR_LCS0, 0xffffffff);
@@ -114,6 +114,8 @@ static void __init vr5701_sg2_board_init
ddb_out32(IPCI_BAR_LCS3, 0xffffffff);
ddb_out32(IPCI_BAR_IREG, 0xffffffff);
+ ddb_out32(IPCI_CTRLL, 0x01000000); /* workaround - Restriction no.1 */
+ ddb_out32(EPCI_CTRLL, 0x01000000); /* workaround - Restriction no.1 */
/*
* We use pci master register 0 for memory space / config space
* And we use register 1 for IO space.
Index: linux-2.6.10/drivers/ide/pci/nec_vr5701_sg2.c
===================================================================
--- linux-2.6.10.orig/drivers/ide/pci/nec_vr5701_sg2.c
+++ linux-2.6.10/drivers/ide/pci/nec_vr5701_sg2.c
@@ -184,6 +184,7 @@ static int __devinit nec_vr5701_init_one
return 1;
}
ide_setup_pci_device(dev, d);
+ pci_write_config_byte(dev, 0x52, 0x00); /* workaround - Restriction no.2 */
return 0;
}
Index: linux-2.6.10/include/asm-mips/vr5701/vr5701.h
===================================================================
--- linux-2.6.10.orig/include/asm-mips/vr5701/vr5701.h
+++ linux-2.6.10/include/asm-mips/vr5701/vr5701.h
@@ -40,6 +40,7 @@
#define LOCAL_CST0 0x400
#define LOCAL_CFG 0x440
/* EPCI registers */
+#define EPCI_CTRLL 0x600
#define EPCI_CTRLH 0x604
#define EPCI_INIT0 0x610
#define EPCI_INIT1 0x618
@@ -77,6 +78,7 @@
#define CSI1_INT 0xBC8
/* IPCI registers*/
+#define IPCI_CTRLL 0xE00
#define IPCI_CTRLH 0xE04
#define IPCI_INIT0 0xE10
#define IPCI_INIT1 0xE18
