---

yaml --- r: 3199 b: refs/heads/master c: 321ab6a h: refs/heads/master i: 3197: 9af6976 3195: 35235b2 3191: 9268d20 3183: 75a82d1 3167: 8075c60 3135: 92b0b65 3071: 13184a5 v: v3
git-mirror · Jun 25, 2005 · 243006f · 243006f
1 parent a7997c2
commit 243006f
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Showing 10 changed files with 42 additions and 8 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 3cd9e19ebc91593c9f076410d6f979be188f01a0
+refs/heads/master: 321ab6a5fab812658626aee6bce2617f8cfb3a55
diff --git a/trunk/arch/arm/configs/enp2611_defconfig b/trunk/arch/arm/configs/enp2611_defconfig
@@ -99,6 +99,7 @@ CONFIG_ARCH_ENP2611=y
 # CONFIG_ARCH_IXDP2800 is not set
 # CONFIG_ARCH_IXDP2401 is not set
 # CONFIG_ARCH_IXDP2801 is not set
+# CONFIG_IXP2000_SUPPORT_BROKEN_PCI_IO is not set
 
 #
 # Processor Type

diff --git a/trunk/arch/arm/configs/ixdp2400_defconfig b/trunk/arch/arm/configs/ixdp2400_defconfig
@@ -100,6 +100,7 @@ CONFIG_ARCH_IXDP2400=y
 CONFIG_ARCH_IXDP2X00=y
 # CONFIG_ARCH_IXDP2401 is not set
 # CONFIG_ARCH_IXDP2801 is not set
+# CONFIG_IXP2000_SUPPORT_BROKEN_PCI_IO is not set
 
 #
 # Processor Type

diff --git a/trunk/arch/arm/configs/ixdp2401_defconfig b/trunk/arch/arm/configs/ixdp2401_defconfig
@@ -100,6 +100,7 @@ CONFIG_ARCH_SUPPORTS_BIG_ENDIAN=y
 CONFIG_ARCH_IXDP2401=y
 # CONFIG_ARCH_IXDP2801 is not set
 CONFIG_ARCH_IXDP2X01=y
+# CONFIG_IXP2000_SUPPORT_BROKEN_PCI_IO is not set
 
 #
 # Processor Type

diff --git a/trunk/arch/arm/configs/ixdp2800_defconfig b/trunk/arch/arm/configs/ixdp2800_defconfig
@@ -100,6 +100,7 @@ CONFIG_ARCH_IXDP2800=y
 CONFIG_ARCH_IXDP2X00=y
 # CONFIG_ARCH_IXDP2401 is not set
 # CONFIG_ARCH_IXDP2801 is not set
+# CONFIG_IXP2000_SUPPORT_BROKEN_PCI_IO is not set
 
 #
 # Processor Type

diff --git a/trunk/arch/arm/configs/ixdp2801_defconfig b/trunk/arch/arm/configs/ixdp2801_defconfig
@@ -100,6 +100,7 @@ CONFIG_ARCH_SUPPORTS_BIG_ENDIAN=y
 # CONFIG_ARCH_IXDP2401 is not set
 CONFIG_ARCH_IXDP2801=y
 CONFIG_ARCH_IXDP2X01=y
+# CONFIG_IXP2000_SUPPORT_BROKEN_PCI_IO is not set
 
 #
 # Processor Type

diff --git a/trunk/arch/arm/mach-ixp2000/Kconfig b/trunk/arch/arm/mach-ixp2000/Kconfig
@@ -54,6 +54,14 @@ config ARCH_IXDP2X01
 	depends on ARCH_IXDP2401 || ARCH_IXDP2801
 	default y	
 
+config IXP2000_SUPPORT_BROKEN_PCI_IO
+	bool "Support broken PCI I/O on older IXP2000s"
+	default y
+	help
+	  Say 'N' here if you only intend to run your kernel on an
+	  IXP2000 B0 or later model and do not need the PCI I/O
+	  byteswap workaround.  Say 'Y' otherwise.
+
 endmenu
 
 endif
diff --git a/trunk/arch/arm/mach-ixp2000/pci.c b/trunk/arch/arm/mach-ixp2000/pci.c
@@ -198,6 +198,19 @@ clear_master_aborts(void)
 void __init
 ixp2000_pci_preinit(void)
 {
+#ifndef CONFIG_IXP2000_SUPPORT_BROKEN_PCI_IO
+	/*
+	 * Configure the PCI unit to properly byteswap I/O transactions,
+	 * and verify that it worked.
+	 */
+	ixp2000_reg_write(IXP2000_PCI_CONTROL,
+			  (*IXP2000_PCI_CONTROL | PCI_CONTROL_IEE));
+
+	if ((*IXP2000_PCI_CONTROL & PCI_CONTROL_IEE) == 0)
+		panic("IXP2000: PCI I/O is broken on this ixp model, and "
+			"the needed workaround has not been configured in");
+#endif
+
 	hook_fault_code(16+6, ixp2000_pci_abort_handler, SIGBUS,
 				"PCI config cycle to non-existent device");
 }

diff --git a/trunk/include/asm-arm/arch-ixp2000/io.h b/trunk/include/asm-arm/arch-ixp2000/io.h
@@ -17,16 +17,21 @@
 
 #define IO_SPACE_LIMIT		0xffffffff
 #define __mem_pci(a)		(a)
-#define ___io(p)		((void __iomem *)((p)+IXP2000_PCI_IO_VIRT_BASE))
 
 /*
- * The IXP2400 before revision B0 asserts byte lanes for PCI I/O
+ * The A? revisions of the IXP2000s assert byte lanes for PCI I/O
  * transactions the other way round (MEM transactions don't have this
- * issue), so we need to override the standard functions.  B0 and later
- * have a bit that can be set to 1 to get the 'proper' behavior, but
- * since that isn't available on the A? revisions we just keep doing
- * things manually.
+ * issue), so if we want to support those models, we need to override
+ * the standard I/O functions.
+ *
+ * B0 and later have a bit that can be set to 1 to get the proper
+ * behavior for I/O transactions, which then allows us to use the
+ * standard I/O functions.  This is what we do if the user does not
+ * explicitly ask for support for pre-B0.
  */
+#ifdef CONFIG_IXP2000_SUPPORT_BROKEN_PCI_IO
+#define ___io(p)		((void __iomem *)((p)+IXP2000_PCI_IO_VIRT_BASE))
+
 #define alignb(addr)		(void __iomem *)((unsigned long)(addr) ^ 3)
 #define alignw(addr)		(void __iomem *)((unsigned long)(addr) ^ 2)
 
@@ -119,6 +124,9 @@
 #define ioport_map(port, nr)	___io(port)
 
 #define ioport_unmap(addr)
+#else
+#define __io(p)			((void __iomem *)((p)+IXP2000_PCI_IO_VIRT_BASE))
+#endif
 
 
 #ifdef CONFIG_ARCH_IXDP2X01

diff --git a/trunk/include/asm-arm/arch-ixp2000/ixp2000-regs.h b/trunk/include/asm-arm/arch-ixp2000/ixp2000-regs.h
@@ -241,7 +241,7 @@
 #define PCI_CONTROL_BE_DEI		(1 << 21)	/* Big Endian Data Enable In  */
 #define PCI_CONTROL_BE_BEO		(1 << 20)	/* Big Endian Byte Enable Out */
 #define PCI_CONTROL_BE_BEI		(1 << 19)	/* Big Endian Byte Enable In  */
-#define PCI_CONTROL_PNR			(1 << 17)	/* PCI Not Reset bit */
+#define PCI_CONTROL_IEE			(1 << 17)	/* I/O cycle Endian swap Enable */
 
 #define IXP2000_PCI_RST_REL		(1 << 2)
 #define CFG_RST_DIR			(*IXP2000_PCI_CONTROL & IXP2000_PCICNTL_PCF)