ARM: ixp4xx: enable multiplatform support

After all the work that Linus Walleij did on this platform, it can be
part of a generic kernel build as well.

Note that there are known bugs in little-endian mode on ixp4xx, and
no other ARMv5 platform at this point supports big-endian mode, or is
likely to in the future, so there is limited practical value in this,
but it helps with build testing and ixp4xx little-endian support may
get fixed in the future.
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Tested-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/Kconfig

@@ -357,22 +357,6 @@ config ARCH_FOOTBRIDGE
 	  Support for systems based on the DC21285 companion chip
 	  ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
 
-config ARCH_IXP4XX
-	bool "IXP4xx-based"
-	depends on CPU_BIG_ENDIAN
-	select ARM_PATCH_PHYS_VIRT
-	select CPU_XSCALE
-	select GPIO_IXP4XX
-	select GPIOLIB
-	select HAVE_PCI
-	select IXP4XX_IRQ
-	select IXP4XX_TIMER
-	select SPARSE_IRQ
-	select USB_EHCI_BIG_ENDIAN_DESC
-	select USB_EHCI_BIG_ENDIAN_MMIO
-	help
-	  Support for Intel's IXP4XX (XScale) family of processors.
-
 config ARCH_PXA
 	bool "PXA2xx/PXA3xx-based"
 	depends on CPU_LITTLE_ENDIAN

arch/arm/configs/ixp4xx_defconfig

@@ -6,6 +6,7 @@ CONFIG_EXPERT=y
 CONFIG_MODULES=y
 CONFIG_MODVERSIONS=y
 # CONFIG_BLK_DEV_BSG is not set
+# CONFIG_ARCH_MULTI_V7 is not set
 CONFIG_ARCH_IXP4XX=y
 CONFIG_MACH_NSLU2=y
 CONFIG_MACH_AVILA=y

arch/arm/mach-ixp4xx/Kconfig

 # SPDX-License-Identifier: GPL-2.0-only
-if ARCH_IXP4XX
-
-menu "Intel IXP4xx Implementation Options"
+menuconfig ARCH_IXP4XX
+	bool "IXP4xx-based platforms"
+	depends on ARCH_MULTI_V5
+	depends on CPU_BIG_ENDIAN
+	select CPU_XSCALE
+	select GPIO_IXP4XX
+	select GPIOLIB
+	select FORCE_PCI
+	select IXP4XX_IRQ
+	select IXP4XX_TIMER
+	select USB_EHCI_BIG_ENDIAN_DESC
+	select USB_EHCI_BIG_ENDIAN_MMIO
+	help
+	  Support for Intel's IXP4XX (XScale) family of processors.
 
-comment "IXP4xx Platforms"
+if ARCH_IXP4XX
 
 config MACH_IXP4XX_OF
 	bool
@@ -12,11 +23,8 @@ config MACH_IXP4XX_OF
 	select ARM_APPENDED_DTB # Old Redboot bootloaders deployed
 	select I2C
 	select I2C_IOP3XX
-	select PCI
 	select USE_OF
 	help
 	  Say 'Y' here to support Device Tree-based IXP4xx platforms.
 
-endmenu
-
 endif

arch/arm/mach-ixp4xx/Makefile.boot

-# SPDX-License-Identifier: GPL-2.0-only
-   zreladdr-y	+= 0x00008000
-params_phys-y	:= 0x00000100
-

arch/arm/mach-ixp4xx/include/mach/uncompress.h

-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * arch/arm/mach-ixp4xx/include/mach/uncompress.h 
- *
- * Copyright (C) 2002 Intel Corporation.
- * Copyright (C) 2003-2004 MontaVista Software, Inc.
- */
-
-#ifndef _ARCH_UNCOMPRESS_H_
-#define _ARCH_UNCOMPRESS_H_
-
-#include <asm/mach-types.h>
-#include <linux/serial_reg.h>
-
-#define IXP4XX_UART1_BASE_PHYS 0xc8000000
-#define IXP4XX_UART2_BASE_PHYS 0xc8001000
-
-#define TX_DONE (UART_LSR_TEMT|UART_LSR_THRE)
-
-volatile u32* uart_base;
-
-static inline void putc(int c)
-{
-	/* Check THRE and TEMT bits before we transmit the character.
-	 */
-	while ((uart_base[UART_LSR] & TX_DONE) != TX_DONE)
-		barrier();
-
-	*uart_base = c;
-}
-
-static void flush(void)
-{
-}
-
-static __inline__ void __arch_decomp_setup(unsigned long arch_id)
-{
-	/*
-	 * Some boards are using UART2 as console
-	 */
-	if (machine_is_adi_coyote() || machine_is_gtwx5715() ||
-	    machine_is_gateway7001() || machine_is_wg302v2() ||
-	    machine_is_devixp() || machine_is_miccpt() || machine_is_mic256())
-		uart_base = (volatile u32*) IXP4XX_UART2_BASE_PHYS;
-	else
-		uart_base = (volatile u32*) IXP4XX_UART1_BASE_PHYS;
-}
-
-/*
- * arch_id is a variable in decompress_kernel()
- */
-#define arch_decomp_setup()	__arch_decomp_setup(arch_id)
-
-#endif