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ARM: ixp4xx: enable multiplatform support

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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>
This commit is contained in:
Arnd Bergmann 2022-04-02 16:52:55 +02:00
parent 5d6f52671e
commit 3d427228f7
5 changed files with 16 additions and 81 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
arch/arm/Kconfig
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@ -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

1
arch/arm/configs/ixp4xx_defconfig
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@ -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

22
arch/arm/mach-ixp4xx/Kconfig
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@ -1,10 +1,21 @@
# SPDX-License-Identifier: GPL-2.0-only
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.
if ARCH_IXP4XX
menu "Intel IXP4xx Implementation Options"
comment "IXP4xx Platforms"
config MACH_IXP4XX_OF
bool
prompt "Device Tree IXP4xx boards"
@ -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

4
arch/arm/mach-ixp4xx/Makefile.boot
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@ -1,4 +0,0 @@
# SPDX-License-Identifier: GPL-2.0-only
zreladdr-y += 0x00008000
params_phys-y := 0x00000100

54
arch/arm/mach-ixp4xx/include/mach/uncompress.h
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@ -1,54 +0,0 @@
/* 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