diff options
Diffstat (limited to 'arch/sh/mm')
| -rw-r--r-- | arch/sh/mm/Kconfig | 29 | ||||
| -rw-r--r-- | arch/sh/mm/Makefile_32 | 1 | ||||
| -rw-r--r-- | arch/sh/mm/ioremap_32.c | 6 | ||||
| -rw-r--r-- | arch/sh/mm/pmb-fixed.c | 45 |
4 files changed, 78 insertions, 3 deletions
diff --git a/arch/sh/mm/Kconfig b/arch/sh/mm/Kconfig index 555ec9714b9..10c24356d2d 100644 --- a/arch/sh/mm/Kconfig +++ b/arch/sh/mm/Kconfig @@ -57,7 +57,7 @@ config 32BIT bool default y if CPU_SH5 -config PMB +config PMB_ENABLE bool "Support 32-bit physical addressing through PMB" depends on MMU && EXPERIMENTAL && (CPU_SUBTYPE_SH7780 || CPU_SUBTYPE_SH7785) select 32BIT @@ -67,6 +67,33 @@ config PMB 32-bits through the SH-4A PMB. If this is not set, legacy 29-bit physical addressing will be used. +choice + prompt "PMB handling type" + depends on PMB_ENABLE + default PMB_FIXED + +config PMB + bool "PMB" + depends on MMU && EXPERIMENTAL && (CPU_SUBTYPE_SH7780 || CPU_SUBTYPE_SH7785) + select 32BIT + help + If you say Y here, physical addressing will be extended to + 32-bits through the SH-4A PMB. If this is not set, legacy + 29-bit physical addressing will be used. + +config PMB_FIXED + bool "fixed PMB" + depends on MMU && EXPERIMENTAL && (CPU_SUBTYPE_SH7780 || \ + CPU_SUBTYPE_SH7785) + select 32BIT + help + If this option is enabled, fixed PMB mappings are inherited + from the boot loader, and the kernel does not attempt dynamic + management. This is the closest to legacy 29-bit physical mode, + and allows systems to support up to 512MiB of system memory. + +endchoice + config X2TLB bool "Enable extended TLB mode" depends on (CPU_SHX2 || CPU_SHX3) && MMU && EXPERIMENTAL diff --git a/arch/sh/mm/Makefile_32 b/arch/sh/mm/Makefile_32 index cb2f3f29959..469ff167245 100644 --- a/arch/sh/mm/Makefile_32 +++ b/arch/sh/mm/Makefile_32 @@ -35,6 +35,7 @@ endif obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o obj-$(CONFIG_PMB) += pmb.o +obj-$(CONFIG_PMB_FIXED) += pmb-fixed.o obj-$(CONFIG_NUMA) += numa.o EXTRA_CFLAGS += -Werror diff --git a/arch/sh/mm/ioremap_32.c b/arch/sh/mm/ioremap_32.c index 8dc77026a0b..60cc486d2c2 100644 --- a/arch/sh/mm/ioremap_32.c +++ b/arch/sh/mm/ioremap_32.c @@ -59,11 +59,13 @@ void __iomem *__ioremap(unsigned long phys_addr, unsigned long size, if (is_pci_memaddr(phys_addr) && is_pci_memaddr(last_addr)) return (void __iomem *)phys_addr; +#if !defined(CONFIG_PMB_FIXED) /* * Don't allow anybody to remap normal RAM that we're using.. */ if (phys_addr < virt_to_phys(high_memory)) return NULL; +#endif /* * Mappings have to be page-aligned @@ -81,7 +83,7 @@ void __iomem *__ioremap(unsigned long phys_addr, unsigned long size, area->phys_addr = phys_addr; orig_addr = addr = (unsigned long)area->addr; -#ifdef CONFIG_32BIT +#ifdef CONFIG_PMB /* * First try to remap through the PMB once a valid VMA has been * established. Smaller allocations (or the rest of the size @@ -122,7 +124,7 @@ void __iounmap(void __iomem *addr) if (seg < P3SEG || vaddr >= P3_ADDR_MAX || is_pci_memaddr(vaddr)) return; -#ifdef CONFIG_32BIT +#ifdef CONFIG_PMB /* * Purge any PMB entries that may have been established for this * mapping, then proceed with conventional VMA teardown. diff --git a/arch/sh/mm/pmb-fixed.c b/arch/sh/mm/pmb-fixed.c new file mode 100644 index 00000000000..43c8eac4d8a --- /dev/null +++ b/arch/sh/mm/pmb-fixed.c @@ -0,0 +1,45 @@ +/* + * arch/sh/mm/fixed_pmb.c + * + * Copyright (C) 2009 Renesas Solutions Corp. + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ +#include <linux/init.h> +#include <linux/mm.h> +#include <linux/io.h> +#include <asm/mmu.h> +#include <asm/mmu_context.h> + +static int __uses_jump_to_uncached fixed_pmb_init(void) +{ + int i; + unsigned long addr, data; + + jump_to_uncached(); + + for (i = 0; i < PMB_ENTRY_MAX; i++) { + addr = PMB_DATA + (i << PMB_E_SHIFT); + data = ctrl_inl(addr); + if (!(data & PMB_V)) + continue; + + if (data & PMB_C) { +#if defined(CONFIG_CACHE_WRITETHROUGH) + data |= PMB_WT; +#elif defined(CONFIG_CACHE_WRITEBACK) + data &= ~PMB_WT; +#else + data &= ~(PMB_C | PMB_WT); +#endif + } + ctrl_outl(data, addr); + } + + back_to_cached(); + + return 0; +} +arch_initcall(fixed_pmb_init); |