NEC VR5701 support

[Sergey Podstavin <spodstavin@ru.mvista.com>]

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Source: MontaVista Software, Inc. Sergey Podstavin <spodstavin@ru.mvista.com>
MR: 17133
Type: Enhancement
Disposition:  needs submitting to linuxmips-embedded mailing list
Signed-off-by: Sergey Podstavin <spodstavin@ru.mvista.com>
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