From f1d2b313c9eb6808d30c16a9eb5251240452a56c Mon Sep 17 00:00:00 2001 From: Heiko Schocher Date: Fri, 17 Sep 2010 13:10:39 +0200 Subject: ARM: add relocation support !! This breaks support for all arm boards !! To compile in old style, you must define CONFIG_SYS_ARM_WITHOUT_RELOC or you can compile with "CONFIG_SYS_ARM_WITHOUT_RELOC=1 ./MAKEALL board" !! This define will be removed soon, so convert your board to use relocation support Portions of this work were supported by funding from the CE Linux Forum. Signed-off-by: Heiko Schocher Fix boot from NAND for non-ARM systems Signed-off-by: Wolfgang Denk --- arch/arm/lib/cache-cp15.c | 37 ++++++++++++++++++++++++++++++++++--- 1 file changed, 34 insertions(+), 3 deletions(-) (limited to 'arch/arm/lib/cache-cp15.c') diff --git a/arch/arm/lib/cache-cp15.c b/arch/arm/lib/cache-cp15.c index b2811f35a6c..fe6d45987bf 100644 --- a/arch/arm/lib/cache-cp15.c +++ b/arch/arm/lib/cache-cp15.c @@ -44,17 +44,44 @@ static void cp_delay (void) asm volatile("" : : : "memory"); } -/* to activate the MMU we need to set up virtual memory: use 1M areas in bss */ +#if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) +static inline void dram_bank_mmu_setup(int bank) +{ + u32 *page_table = (u32 *)gd->tlb_addr; + 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++) { + page_table[i] = i << 20 | (3 << 10) | CACHE_SETUP; + } +} +#endif + +/* to activate the MMU we need to set up virtual memory: use 1M areas */ static inline void mmu_setup(void) { +#if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) + u32 *page_table = (u32 *)gd->tlb_addr; +#else static u32 __attribute__((aligned(16384))) page_table[4096]; bd_t *bd = gd->bd; - int i, j; + int j; +#endif + int i; u32 reg; /* 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; + +#if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) + for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) { + dram_bank_mmu_setup(i); + } +#else /* Then, enable cacheable and bufferable for RAM only */ for (j = 0; j < CONFIG_NR_DRAM_BANKS; j++) { for (i = bd->bi_dram[j].start >> 20; @@ -63,6 +90,7 @@ static inline void mmu_setup(void) page_table[i] = i << 20 | (3 << 10) | CACHE_SETUP; } } +#endif /* Copy the page table address to cp15 */ asm volatile("mcr p15, 0, %0, c2, c0, 0" @@ -74,7 +102,6 @@ static inline void mmu_setup(void) reg = get_cr(); /* get control reg. */ cp_delay(); set_cr(reg | CR_M); - } /* cache_bit must be either CR_I or CR_C */ @@ -96,6 +123,10 @@ static void cache_disable(uint32_t cache_bit) uint32_t reg; if (cache_bit == CR_C) { + /* if cache isn;t enabled no need to disable */ + reg = get_cr(); + if ((reg & CR_C) != CR_C) + return; /* if disabling data cache, disable mmu too */ cache_bit |= CR_M; flush_cache(0, ~0); -- cgit v1.2.3