diff options
Diffstat (limited to 'arch/arm/mm/blockops.c')
| -rw-r--r-- | arch/arm/mm/blockops.c | 185 |
1 files changed, 0 insertions, 185 deletions
diff --git a/arch/arm/mm/blockops.c b/arch/arm/mm/blockops.c deleted file mode 100644 index 4f5ee2d0899..00000000000 --- a/arch/arm/mm/blockops.c +++ /dev/null @@ -1,185 +0,0 @@ -#include <linux/kernel.h> -#include <linux/init.h> -#include <linux/errno.h> -#include <linux/mm.h> - -#include <asm/memory.h> -#include <asm/ptrace.h> -#include <asm/cacheflush.h> -#include <asm/traps.h> - -extern struct cpu_cache_fns blk_cache_fns; - -#define HARVARD_CACHE - -/* - * blk_flush_kern_dcache_page(kaddr) - * - * Ensure that the data held in the page kaddr is written back - * to the page in question. - * - * - kaddr - kernel address (guaranteed to be page aligned) - */ -static void __attribute__((naked)) -blk_flush_kern_dcache_page(void *kaddr) -{ - asm( - "add r1, r0, %0 \n\ - sub r1, r1, %1 \n\ -1: .word 0xec401f0e @ mcrr p15, 0, r0, r1, c14, 0 @ blocking \n\ - mov r0, #0 \n\ - mcr p15, 0, r0, c7, c5, 0 \n\ - mcr p15, 0, r0, c7, c10, 4 \n\ - mov pc, lr" - : - : "I" (PAGE_SIZE), "I" (L1_CACHE_BYTES)); -} - -/* - * blk_dma_inv_range(start,end) - * - * Invalidate the data cache within the specified region; we will - * be performing a DMA operation in this region and we want to - * purge old data in the cache. - * - * - start - virtual start address of region - * - end - virtual end address of region - */ -static void __attribute__((naked)) -blk_dma_inv_range_unified(unsigned long start, unsigned long end) -{ - asm( - "tst r0, %0 \n\ - mcrne p15, 0, r0, c7, c11, 1 @ clean unified line \n\ - tst r1, %0 \n\ - mcrne p15, 0, r1, c7, c15, 1 @ clean & invalidate unified line\n\ - .word 0xec401f06 @ mcrr p15, 0, r1, r0, c6, 0 @ blocking \n\ - mov r0, #0 \n\ - mcr p15, 0, r0, c7, c10, 4 @ drain write buffer \n\ - mov pc, lr" - : - : "I" (L1_CACHE_BYTES - 1)); -} - -static void __attribute__((naked)) -blk_dma_inv_range_harvard(unsigned long start, unsigned long end) -{ - asm( - "tst r0, %0 \n\ - mcrne p15, 0, r0, c7, c10, 1 @ clean D line \n\ - tst r1, %0 \n\ - mcrne p15, 0, r1, c7, c14, 1 @ clean & invalidate D line \n\ - .word 0xec401f06 @ mcrr p15, 0, r1, r0, c6, 0 @ blocking \n\ - mov r0, #0 \n\ - mcr p15, 0, r0, c7, c10, 4 @ drain write buffer \n\ - mov pc, lr" - : - : "I" (L1_CACHE_BYTES - 1)); -} - -/* - * blk_dma_clean_range(start,end) - * - start - virtual start address of region - * - end - virtual end address of region - */ -static void __attribute__((naked)) -blk_dma_clean_range(unsigned long start, unsigned long end) -{ - asm( - ".word 0xec401f0c @ mcrr p15, 0, r1, r0, c12, 0 @ blocking \n\ - mov r0, #0 \n\ - mcr p15, 0, r0, c7, c10, 4 @ drain write buffer \n\ - mov pc, lr"); -} - -/* - * blk_dma_flush_range(start,end) - * - start - virtual start address of region - * - end - virtual end address of region - */ -static void __attribute__((naked)) -blk_dma_flush_range(unsigned long start, unsigned long end) -{ - asm( - ".word 0xec401f0e @ mcrr p15, 0, r1, r0, c14, 0 @ blocking \n\ - mov pc, lr"); -} - -static int blockops_trap(struct pt_regs *regs, unsigned int instr) -{ - regs->ARM_r4 |= regs->ARM_r2; - regs->ARM_pc += 4; - return 0; -} - -static char *func[] = { - "Prefetch data range", - "Clean+Invalidate data range", - "Clean data range", - "Invalidate data range", - "Invalidate instr range" -}; - -static struct undef_hook blockops_hook __initdata = { - .instr_mask = 0x0fffffd0, - .instr_val = 0x0c401f00, - .cpsr_mask = PSR_T_BIT, - .cpsr_val = 0, - .fn = blockops_trap, -}; - -static int __init blockops_check(void) -{ - register unsigned int err asm("r4") = 0; - unsigned int err_pos = 1; - unsigned int cache_type; - int i; - - asm("mrc p15, 0, %0, c0, c0, 1" : "=r" (cache_type)); - - printk("Checking V6 block cache operations:\n"); - register_undef_hook(&blockops_hook); - - __asm__ ("mov r0, %0\n\t" - "mov r1, %1\n\t" - "mov r2, #1\n\t" - ".word 0xec401f2c @ mcrr p15, 0, r1, r0, c12, 2\n\t" - "mov r2, #2\n\t" - ".word 0xec401f0e @ mcrr p15, 0, r1, r0, c14, 0\n\t" - "mov r2, #4\n\t" - ".word 0xec401f0c @ mcrr p15, 0, r1, r0, c12, 0\n\t" - "mov r2, #8\n\t" - ".word 0xec401f06 @ mcrr p15, 0, r1, r0, c6, 0\n\t" - "mov r2, #16\n\t" - ".word 0xec401f05 @ mcrr p15, 0, r1, r0, c5, 0\n\t" - : - : "r" (PAGE_OFFSET), "r" (PAGE_OFFSET + 128) - : "r0", "r1", "r2"); - - unregister_undef_hook(&blockops_hook); - - for (i = 0; i < ARRAY_SIZE(func); i++, err_pos <<= 1) - printk("%30s: %ssupported\n", func[i], err & err_pos ? "not " : ""); - - if ((err & 8) == 0) { - printk(" --> Using %s block cache invalidate\n", - cache_type & (1 << 24) ? "harvard" : "unified"); - if (cache_type & (1 << 24)) - cpu_cache.dma_inv_range = blk_dma_inv_range_harvard; - else - cpu_cache.dma_inv_range = blk_dma_inv_range_unified; - } - if ((err & 4) == 0) { - printk(" --> Using block cache clean\n"); - cpu_cache.dma_clean_range = blk_dma_clean_range; - } - if ((err & 2) == 0) { - printk(" --> Using block cache clean+invalidate\n"); - cpu_cache.dma_flush_range = blk_dma_flush_range; - cpu_cache.flush_kern_dcache_page = blk_flush_kern_dcache_page; - } - - return 0; -} - -__initcall(blockops_check); |