diff --git a/arch/arm/lib/cache-cp15.c b/arch/arm/lib/cache-cp15.c index c65e068857..b044bd36f3 100644 --- a/arch/arm/lib/cache-cp15.c +++ b/arch/arm/lib/cache-cp15.c @@ -62,6 +62,56 @@ void mmu_set_region_dcache_behaviour(phys_addr_t start, size_t size, mmu_page_table_flush((u32)&page_table[start], (u32)&page_table[end]); } +#if defined(CONFIG_ARCH_IPQ40xx) || defined(CONFIG_ARCH_IPQ807x) +#define UBOOT_CACHE_SETUP 0x100e +#define GEN_CACHE_SETUP 0x101e + +__weak void dram_bank_mmu_setup(int bank) +{ + bd_t *bd = gd->bd; + int i; + + debug("%s: bank: %d\n", __func__, bank); + for (i = bd->bi_dram[bank].start >> 20; + i < (bd->bi_dram[bank].start + bd->bi_dram[bank].size) >> 20; + i++) { + /* Set XN bit for all dram regions except uboot code region */ + if (i >= (CONFIG_SYS_TEXT_BASE >> 20) && i < ((CONFIG_SYS_TEXT_BASE + 0x100000) >> 20)) + set_section_dcache(i, UBOOT_CACHE_SETUP); + else + set_section_dcache(i, GEN_CACHE_SETUP); + } +} + +/* to activate the MMU we need to set up virtual memory: use 1M areas */ +static inline void mmu_setup(void) +{ + 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++) + set_section_dcache(i, DCACHE_WRITEALLOC); + + for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) { + dram_bank_mmu_setup(i); + } + + /* Copy the page table address to cp15 */ + asm volatile("mcr p15, 0, %0, c2, c0, 0" + : : "r" (gd->arch.tlb_addr) : "memory"); + + /* Set the access control to all clients */ + set_dacr(0x55555555); + + /* and enable the mmu */ + reg = get_cr(); /* get control reg. */ + cp_delay(); + set_cr(reg | CR_M); +} + +#else __weak void dram_bank_mmu_setup(int bank) { bd_t *bd = gd->bd; @@ -124,6 +174,7 @@ static inline void mmu_setup(void) cp_delay(); set_cr(reg | CR_M); } +#endif static int mmu_enabled(void) {