| From b7c1666813424d329868335c8faf8886b0f85b6c Mon Sep 17 00:00:00 2001 |
| From: Greg Ungerer <gerg@linux-m68k.org> |
| Date: Thu, 11 Aug 2016 21:33:11 +1000 |
| Subject: [PATCH] arm: fix versatile platform to work in no-MMU mode |
| |
| If CONFIG_MMU is disabled then do not carry out the virtual memory address |
| translation for IO devices. |
| |
| With this fix in place we can run the ARM Versatile board (including its |
| qemu emulation) as a no-MMU Linux system. |
| |
| Signed-off-by: Greg Ungerer <gerg@linux-m68k.org> |
| Signed-off-by: Waldemar Brodkorb <wbx@openadk.org> |
| |
| diff -Nur linux-4.4.17.orig/arch/arm/mach-versatile/include/mach/hardware.h linux-4.4.17/arch/arm/mach-versatile/include/mach/hardware.h |
| --- linux-4.4.17.orig/arch/arm/mach-versatile/include/mach/hardware.h 2016-08-10 11:49:43.000000000 +0200 |
| +++ linux-4.4.17/arch/arm/mach-versatile/include/mach/hardware.h 2016-08-25 23:19:03.691716292 +0200 |
| @@ -30,8 +30,12 @@ |
| #define VERSATILE_PCI_VIRT_BASE (void __iomem *)0xe8000000ul |
| #define VERSATILE_PCI_CFG_VIRT_BASE (void __iomem *)0xe9000000ul |
| |
| +#ifdef CONFIG_MMU |
| /* macro to get at MMIO space when running virtually */ |
| #define IO_ADDRESS(x) (((x) & 0x0fffffff) + (((x) >> 4) & 0x0f000000) + 0xf0000000) |
| +#else |
| +#define IO_ADDRESS(x) (x) |
| +#endif |
| |
| #define __io_address(n) ((void __iomem __force *)IO_ADDRESS(n)) |
| |
