diff options
Diffstat (limited to 'arch/arm/mm/cache-xsc3l2.c')
| -rw-r--r-- | arch/arm/mm/cache-xsc3l2.c | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/arch/arm/mm/cache-xsc3l2.c b/arch/arm/mm/cache-xsc3l2.c new file mode 100644 index 000000000..d20d7af02 --- /dev/null +++ b/arch/arm/mm/cache-xsc3l2.c @@ -0,0 +1,208 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * arch/arm/mm/cache-xsc3l2.c - XScale3 L2 cache controller support + * + * Copyright (C) 2007 ARM Limited + */ +#include <linux/init.h> +#include <linux/highmem.h> +#include <asm/cp15.h> +#include <asm/cputype.h> +#include <asm/cacheflush.h> + +#define CR_L2 (1 << 26) + +#define CACHE_LINE_SIZE 32 +#define CACHE_LINE_SHIFT 5 +#define CACHE_WAY_PER_SET 8 + +#define CACHE_WAY_SIZE(l2ctype) (8192 << (((l2ctype) >> 8) & 0xf)) +#define CACHE_SET_SIZE(l2ctype) (CACHE_WAY_SIZE(l2ctype) >> CACHE_LINE_SHIFT) + +static inline int xsc3_l2_present(void) +{ + unsigned long l2ctype; + + __asm__("mrc p15, 1, %0, c0, c0, 1" : "=r" (l2ctype)); + + return !!(l2ctype & 0xf8); +} + +static inline void xsc3_l2_clean_mva(unsigned long addr) +{ + __asm__("mcr p15, 1, %0, c7, c11, 1" : : "r" (addr)); +} + +static inline void xsc3_l2_inv_mva(unsigned long addr) +{ + __asm__("mcr p15, 1, %0, c7, c7, 1" : : "r" (addr)); +} + +static inline void xsc3_l2_inv_all(void) +{ + unsigned long l2ctype, set_way; + int set, way; + + __asm__("mrc p15, 1, %0, c0, c0, 1" : "=r" (l2ctype)); + + for (set = 0; set < CACHE_SET_SIZE(l2ctype); set++) { + for (way = 0; way < CACHE_WAY_PER_SET; way++) { + set_way = (way << 29) | (set << 5); + __asm__("mcr p15, 1, %0, c7, c11, 2" : : "r"(set_way)); + } + } + + dsb(); +} + +static inline void l2_unmap_va(unsigned long va) +{ +#ifdef CONFIG_HIGHMEM + if (va != -1) + kunmap_atomic((void *)va); +#endif +} + +static inline unsigned long l2_map_va(unsigned long pa, unsigned long prev_va) +{ +#ifdef CONFIG_HIGHMEM + unsigned long va = prev_va & PAGE_MASK; + unsigned long pa_offset = pa << (32 - PAGE_SHIFT); + if (unlikely(pa_offset < (prev_va << (32 - PAGE_SHIFT)))) { + /* + * Switching to a new page. Because cache ops are + * using virtual addresses only, we must put a mapping + * in place for it. + */ + l2_unmap_va(prev_va); + va = (unsigned long)kmap_atomic_pfn(pa >> PAGE_SHIFT); + } + return va + (pa_offset >> (32 - PAGE_SHIFT)); +#else + return __phys_to_virt(pa); +#endif +} + +static void xsc3_l2_inv_range(unsigned long start, unsigned long end) +{ + unsigned long vaddr; + + if (start == 0 && end == -1ul) { + xsc3_l2_inv_all(); + return; + } + + vaddr = -1; /* to force the first mapping */ + + /* + * Clean and invalidate partial first cache line. + */ + if (start & (CACHE_LINE_SIZE - 1)) { + vaddr = l2_map_va(start & ~(CACHE_LINE_SIZE - 1), vaddr); + xsc3_l2_clean_mva(vaddr); + xsc3_l2_inv_mva(vaddr); + start = (start | (CACHE_LINE_SIZE - 1)) + 1; + } + + /* + * Invalidate all full cache lines between 'start' and 'end'. + */ + while (start < (end & ~(CACHE_LINE_SIZE - 1))) { + vaddr = l2_map_va(start, vaddr); + xsc3_l2_inv_mva(vaddr); + start += CACHE_LINE_SIZE; + } + + /* + * Clean and invalidate partial last cache line. + */ + if (start < end) { + vaddr = l2_map_va(start, vaddr); + xsc3_l2_clean_mva(vaddr); + xsc3_l2_inv_mva(vaddr); + } + + l2_unmap_va(vaddr); + + dsb(); +} + +static void xsc3_l2_clean_range(unsigned long start, unsigned long end) +{ + unsigned long vaddr; + + vaddr = -1; /* to force the first mapping */ + + start &= ~(CACHE_LINE_SIZE - 1); + while (start < end) { + vaddr = l2_map_va(start, vaddr); + xsc3_l2_clean_mva(vaddr); + start += CACHE_LINE_SIZE; + } + + l2_unmap_va(vaddr); + + dsb(); +} + +/* + * optimize L2 flush all operation by set/way format + */ +static inline void xsc3_l2_flush_all(void) +{ + unsigned long l2ctype, set_way; + int set, way; + + __asm__("mrc p15, 1, %0, c0, c0, 1" : "=r" (l2ctype)); + + for (set = 0; set < CACHE_SET_SIZE(l2ctype); set++) { + for (way = 0; way < CACHE_WAY_PER_SET; way++) { + set_way = (way << 29) | (set << 5); + __asm__("mcr p15, 1, %0, c7, c15, 2" : : "r"(set_way)); + } + } + + dsb(); +} + +static void xsc3_l2_flush_range(unsigned long start, unsigned long end) +{ + unsigned long vaddr; + + if (start == 0 && end == -1ul) { + xsc3_l2_flush_all(); + return; + } + + vaddr = -1; /* to force the first mapping */ + + start &= ~(CACHE_LINE_SIZE - 1); + while (start < end) { + vaddr = l2_map_va(start, vaddr); + xsc3_l2_clean_mva(vaddr); + xsc3_l2_inv_mva(vaddr); + start += CACHE_LINE_SIZE; + } + + l2_unmap_va(vaddr); + + dsb(); +} + +static int __init xsc3_l2_init(void) +{ + if (!cpu_is_xsc3() || !xsc3_l2_present()) + return 0; + + if (get_cr() & CR_L2) { + pr_info("XScale3 L2 cache enabled.\n"); + xsc3_l2_inv_all(); + + outer_cache.inv_range = xsc3_l2_inv_range; + outer_cache.clean_range = xsc3_l2_clean_range; + outer_cache.flush_range = xsc3_l2_flush_range; + } + + return 0; +} +core_initcall(xsc3_l2_init); |