Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * arch/sh/mm/cache-sh3.c |
| 3 | * |
| 4 | * Copyright (C) 1999, 2000 Niibe Yutaka |
| 5 | * Copyright (C) 2002 Paul Mundt |
| 6 | * |
| 7 | * Released under the terms of the GNU GPL v2.0. |
| 8 | */ |
| 9 | |
| 10 | #include <linux/init.h> |
| 11 | #include <linux/mman.h> |
| 12 | #include <linux/mm.h> |
| 13 | #include <linux/threads.h> |
| 14 | #include <asm/addrspace.h> |
| 15 | #include <asm/page.h> |
| 16 | #include <asm/pgtable.h> |
| 17 | #include <asm/processor.h> |
| 18 | #include <asm/cache.h> |
| 19 | #include <asm/io.h> |
| 20 | #include <asm/uaccess.h> |
| 21 | #include <asm/pgalloc.h> |
| 22 | #include <asm/mmu_context.h> |
| 23 | #include <asm/cacheflush.h> |
| 24 | |
| 25 | /* |
| 26 | * Write back the dirty D-caches, but not invalidate them. |
| 27 | * |
| 28 | * Is this really worth it, or should we just alias this routine |
| 29 | * to __flush_purge_region too? |
| 30 | * |
| 31 | * START: Virtual Address (U0, P1, or P3) |
| 32 | * SIZE: Size of the region. |
| 33 | */ |
| 34 | |
Paul Mundt | 79f1c9d | 2009-08-15 12:42:55 +0900 | [diff] [blame^] | 35 | static void sh3__flush_wback_region(void *start, int size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | { |
| 37 | unsigned long v, j; |
| 38 | unsigned long begin, end; |
| 39 | unsigned long flags; |
| 40 | |
| 41 | begin = (unsigned long)start & ~(L1_CACHE_BYTES-1); |
| 42 | end = ((unsigned long)start + size + L1_CACHE_BYTES-1) |
| 43 | & ~(L1_CACHE_BYTES-1); |
| 44 | |
| 45 | for (v = begin; v < end; v+=L1_CACHE_BYTES) { |
| 46 | unsigned long addrstart = CACHE_OC_ADDRESS_ARRAY; |
Paul Mundt | 11c1965 | 2006-12-25 10:19:56 +0900 | [diff] [blame] | 47 | for (j = 0; j < current_cpu_data.dcache.ways; j++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | unsigned long data, addr, p; |
| 49 | |
| 50 | p = __pa(v); |
Paul Mundt | 11c1965 | 2006-12-25 10:19:56 +0900 | [diff] [blame] | 51 | addr = addrstart | (v & current_cpu_data.dcache.entry_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | local_irq_save(flags); |
| 53 | data = ctrl_inl(addr); |
| 54 | |
| 55 | if ((data & CACHE_PHYSADDR_MASK) == |
| 56 | (p & CACHE_PHYSADDR_MASK)) { |
| 57 | data &= ~SH_CACHE_UPDATED; |
| 58 | ctrl_outl(data, addr); |
| 59 | local_irq_restore(flags); |
| 60 | break; |
| 61 | } |
| 62 | local_irq_restore(flags); |
Paul Mundt | 11c1965 | 2006-12-25 10:19:56 +0900 | [diff] [blame] | 63 | addrstart += current_cpu_data.dcache.way_incr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | } |
| 65 | } |
| 66 | } |
| 67 | |
| 68 | /* |
| 69 | * Write back the dirty D-caches and invalidate them. |
| 70 | * |
| 71 | * START: Virtual Address (U0, P1, or P3) |
| 72 | * SIZE: Size of the region. |
| 73 | */ |
Paul Mundt | 79f1c9d | 2009-08-15 12:42:55 +0900 | [diff] [blame^] | 74 | static void sh3__flush_purge_region(void *start, int size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | { |
| 76 | unsigned long v; |
| 77 | unsigned long begin, end; |
| 78 | |
| 79 | begin = (unsigned long)start & ~(L1_CACHE_BYTES-1); |
| 80 | end = ((unsigned long)start + size + L1_CACHE_BYTES-1) |
| 81 | & ~(L1_CACHE_BYTES-1); |
| 82 | |
| 83 | for (v = begin; v < end; v+=L1_CACHE_BYTES) { |
| 84 | unsigned long data, addr; |
| 85 | |
| 86 | data = (v & 0xfffffc00); /* _Virtual_ address, ~U, ~V */ |
| 87 | addr = CACHE_OC_ADDRESS_ARRAY | |
Paul Mundt | 11c1965 | 2006-12-25 10:19:56 +0900 | [diff] [blame] | 88 | (v & current_cpu_data.dcache.entry_mask) | SH_CACHE_ASSOC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | ctrl_outl(data, addr); |
| 90 | } |
| 91 | } |
| 92 | |
Paul Mundt | 79f1c9d | 2009-08-15 12:42:55 +0900 | [diff] [blame^] | 93 | void __init sh3_cache_init(void) |
| 94 | { |
| 95 | __flush_wback_region = sh3__flush_wback_region; |
| 96 | __flush_purge_region = sh3__flush_purge_region; |
| 97 | |
| 98 | /* |
| 99 | * No write back please |
| 100 | * |
| 101 | * Except I don't think there's any way to avoid the writeback. |
| 102 | * So we just alias it to sh3__flush_purge_region(). dwmw2. |
| 103 | */ |
| 104 | __flush_invalidate_region = sh3__flush_purge_region; |
| 105 | } |