diff options
Diffstat (limited to 'arch/v850/kernel/v850e2_cache.c')
| -rw-r--r-- | arch/v850/kernel/v850e2_cache.c | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/arch/v850/kernel/v850e2_cache.c b/arch/v850/kernel/v850e2_cache.c new file mode 100644 index 000000000000..4570312c689c --- /dev/null +++ b/arch/v850/kernel/v850e2_cache.c @@ -0,0 +1,127 @@ +/* + * arch/v850/kernel/v850e2_cache.c -- Cache control for V850E2 cache + * memories + * + * Copyright (C) 2003 NEC Electronics Corporation + * Copyright (C) 2003 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +#include <linux/mm.h> + +#include <asm/v850e2_cache.h> + +/* Cache operations we can do. The encoding corresponds directly to the + value we need to write into the COPR register. */ +enum cache_op { + OP_SYNC_IF_DIRTY = V850E2_CACHE_COPR_CFC(0), /* 000 */ + OP_SYNC_IF_VALID = V850E2_CACHE_COPR_CFC(1), /* 001 */ + OP_SYNC_IF_VALID_AND_CLEAR = V850E2_CACHE_COPR_CFC(3), /* 011 */ + OP_WAY_CLEAR = V850E2_CACHE_COPR_CFC(4), /* 100 */ + OP_FILL = V850E2_CACHE_COPR_CFC(5), /* 101 */ + OP_CLEAR = V850E2_CACHE_COPR_CFC(6), /* 110 */ + OP_CREATE_DIRTY = V850E2_CACHE_COPR_CFC(7) /* 111 */ +}; + +/* Which cache to use. This encoding also corresponds directly to the + value we need to write into the COPR register. */ +enum cache { + ICACHE = 0, + DCACHE = V850E2_CACHE_COPR_LBSL +}; + +/* Returns ADDR rounded down to the beginning of its cache-line. */ +#define CACHE_LINE_ADDR(addr) \ + ((addr) & ~(V850E2_CACHE_LINE_SIZE - 1)) +/* Returns END_ADDR rounded up to the `limit' of its cache-line. */ +#define CACHE_LINE_END_ADDR(end_addr) \ + CACHE_LINE_ADDR(end_addr + (V850E2_CACHE_LINE_SIZE - 1)) + + +/* Low-level cache ops. */ + +/* Apply cache-op OP to all entries in CACHE. */ +static inline void cache_op_all (enum cache_op op, enum cache cache) +{ + int cmd = op | cache | V850E2_CACHE_COPR_WSLE | V850E2_CACHE_COPR_STRT; + + if (op != OP_WAY_CLEAR) { + /* The WAY_CLEAR operation does the whole way, but other + ops take begin-index and count params; we just indicate + the entire cache. */ + V850E2_CACHE_CADL = 0; + V850E2_CACHE_CADH = 0; + V850E2_CACHE_CCNT = V850E2_CACHE_WAY_SIZE - 1; + } + + V850E2_CACHE_COPR = cmd | V850E2_CACHE_COPR_WSL(0); /* way 0 */ + V850E2_CACHE_COPR = cmd | V850E2_CACHE_COPR_WSL(1); /* way 1 */ + V850E2_CACHE_COPR = cmd | V850E2_CACHE_COPR_WSL(2); /* way 2 */ + V850E2_CACHE_COPR = cmd | V850E2_CACHE_COPR_WSL(3); /* way 3 */ +} + +/* Apply cache-op OP to all entries in CACHE covering addresses ADDR + through ADDR+LEN. */ +static inline void cache_op_range (enum cache_op op, u32 addr, u32 len, + enum cache cache) +{ + u32 start = CACHE_LINE_ADDR (addr); + u32 end = CACHE_LINE_END_ADDR (addr + len); + u32 num_lines = (end - start) >> V850E2_CACHE_LINE_SIZE_BITS; + + V850E2_CACHE_CADL = start & 0xFFFF; + V850E2_CACHE_CADH = start >> 16; + V850E2_CACHE_CCNT = num_lines - 1; + + V850E2_CACHE_COPR = op | cache | V850E2_CACHE_COPR_STRT; +} + + +/* High-level ops. */ + +static void cache_exec_after_store_all (void) +{ + cache_op_all (OP_SYNC_IF_DIRTY, DCACHE); + cache_op_all (OP_WAY_CLEAR, ICACHE); +} + +static void cache_exec_after_store_range (u32 start, u32 len) +{ + cache_op_range (OP_SYNC_IF_DIRTY, start, len, DCACHE); + cache_op_range (OP_CLEAR, start, len, ICACHE); +} + + +/* Exported functions. */ + +void flush_icache (void) +{ + cache_exec_after_store_all (); +} + +void flush_icache_range (unsigned long start, unsigned long end) +{ + cache_exec_after_store_range (start, end - start); +} + +void flush_icache_page (struct vm_area_struct *vma, struct page *page) +{ + cache_exec_after_store_range (page_to_virt (page), PAGE_SIZE); +} + +void flush_icache_user_range (struct vm_area_struct *vma, struct page *page, + unsigned long addr, int len) +{ + cache_exec_after_store_range (addr, len); +} + +void flush_cache_sigtramp (unsigned long addr) +{ + /* For the exact size, see signal.c, but 16 bytes should be enough. */ + cache_exec_after_store_range (addr, 16); +} |