diff options
| -rw-r--r-- | arch/arm/cpu/armv7/cache_v7.c | 11 | ||||
| -rw-r--r-- | arch/arm/include/asm/system.h | 31 | ||||
| -rw-r--r-- | arch/arm/lib/cache-cp15.c | 51 |
3 files changed, 82 insertions, 11 deletions
diff --git a/arch/arm/cpu/armv7/cache_v7.c b/arch/arm/cpu/armv7/cache_v7.c index 1b4e808..5f6d039 100644 --- a/arch/arm/cpu/armv7/cache_v7.c +++ b/arch/arm/cpu/armv7/cache_v7.c @@ -297,6 +297,12 @@ void arm_init_before_mmu(void) v7_inval_tlb(); } +void mmu_page_table_flush(unsigned long start, unsigned long stop) +{ + flush_dcache_range(start, stop); + v7_inval_tlb(); +} + /* * Flush range from all levels of d-cache/unified-cache used: * Affects the range [start, start + size - 1] @@ -329,6 +335,11 @@ void arm_init_before_mmu(void) void flush_cache(unsigned long start, unsigned long size) { } + +void mmu_page_table_flush(unsigned long start, unsigned long stop) +{ +} + #endif /* #ifndef CONFIG_SYS_DCACHE_OFF */ #ifndef CONFIG_SYS_ICACHE_OFF diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h index 2b28a26..78ca8e0 100644 --- a/arch/arm/include/asm/system.h +++ b/arch/arm/include/asm/system.h @@ -75,6 +75,37 @@ static inline void set_cr(unsigned int val) isb(); } +/* options available for data cache on each page */ +enum dcache_option { + DCACHE_OFF = 0x12, + DCACHE_WRITETHROUGH = 0x1a, + DCACHE_WRITEBACK = 0x1e, +}; + +/* Size of an MMU section */ +enum { + MMU_SECTION_SHIFT = 20, + MMU_SECTION_SIZE = 1 << MMU_SECTION_SHIFT, +}; + +/** + * Change the cache settings for a region. + * + * \param start start address of memory region to change + * \param size size of memory region to change + * \param option dcache option to select + */ +void mmu_set_region_dcache_behaviour(u32 start, int size, + enum dcache_option option); + +/** + * Register an update to the page tables, and flush the TLB + * + * \param start start address of update in page table + * \param stop stop address of update in page table + */ +void mmu_page_table_flush(unsigned long start, unsigned long stop); + #endif /* __ASSEMBLY__ */ #define arch_align_stack(x) (x) diff --git a/arch/arm/lib/cache-cp15.c b/arch/arm/lib/cache-cp15.c index 939de10..6edf815 100644 --- a/arch/arm/lib/cache-cp15.c +++ b/arch/arm/lib/cache-cp15.c @@ -26,12 +26,6 @@ #if !(defined(CONFIG_SYS_ICACHE_OFF) && defined(CONFIG_SYS_DCACHE_OFF)) -#if defined(CONFIG_SYS_ARM_CACHE_WRITETHROUGH) -#define CACHE_SETUP 0x1a -#else -#define CACHE_SETUP 0x1e -#endif - DECLARE_GLOBAL_DATA_PTR; void __arm_init_before_mmu(void) @@ -50,9 +44,41 @@ static void cp_delay (void) asm volatile("" : : : "memory"); } -static inline void dram_bank_mmu_setup(int bank) +void set_section_dcache(int section, enum dcache_option option) { u32 *page_table = (u32 *)gd->tlb_addr; + u32 value; + + value = (section << MMU_SECTION_SHIFT) | (3 << 10); + value |= option; + page_table[section] = value; +} + +void __mmu_page_table_flush(unsigned long start, unsigned long stop) +{ + debug("%s: Warning: not implemented\n", __func__); +} + +void mmu_page_table_flush(unsigned long start, unsigned long stop) + __attribute__((weak, alias("__mmu_page_table_flush"))); + +void mmu_set_region_dcache_behaviour(u32 start, int size, + enum dcache_option option) +{ + u32 *page_table = (u32 *)gd->tlb_addr; + u32 upto, end; + + end = ALIGN(start + size, MMU_SECTION_SIZE) >> MMU_SECTION_SHIFT; + start = start >> MMU_SECTION_SHIFT; + debug("%s: start=%x, size=%x, option=%d\n", __func__, start, size, + option); + for (upto = start; upto < end; upto++) + set_section_dcache(upto, option); + mmu_page_table_flush((u32)&page_table[start], (u32)&page_table[end]); +} + +static inline void dram_bank_mmu_setup(int bank) +{ bd_t *bd = gd->bd; int i; @@ -60,21 +86,24 @@ static inline void dram_bank_mmu_setup(int bank) for (i = bd->bi_dram[bank].start >> 20; i < (bd->bi_dram[bank].start + bd->bi_dram[bank].size) >> 20; i++) { - page_table[i] = i << 20 | (3 << 10) | CACHE_SETUP; +#if defined(CONFIG_SYS_ARM_CACHE_WRITETHROUGH) + set_section_dcache(i, DCACHE_WRITETHROUGH); +#else + set_section_dcache(i, DCACHE_WRITEBACK); +#endif } } /* to activate the MMU we need to set up virtual memory: use 1M areas */ static inline void mmu_setup(void) { - u32 *page_table = (u32 *)gd->tlb_addr; int i; u32 reg; arm_init_before_mmu(); /* Set up an identity-mapping for all 4GB, rw for everyone */ for (i = 0; i < 4096; i++) - page_table[i] = i << 20 | (3 << 10) | 0x12; + set_section_dcache(i, DCACHE_OFF); for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) { dram_bank_mmu_setup(i); @@ -82,7 +111,7 @@ static inline void mmu_setup(void) /* Copy the page table address to cp15 */ asm volatile("mcr p15, 0, %0, c2, c0, 0" - : : "r" (page_table) : "memory"); + : : "r" (gd->tlb_addr) : "memory"); /* Set the access control to all-supervisor */ asm volatile("mcr p15, 0, %0, c3, c0, 0" : : "r" (~0)); |