arch/arm/mm/cache-xsc3l2.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * arch/arm/mm/cache-xsc3l2.c - XScale3 L2 cache controller support
   4  *
   5  * Copyright (C) 2007 ARM Limited
   6  */
   7 #include <linux/init.h>
   8 #include <linux/highmem.h>
   9 #include <asm/cp15.h>
  10 #include <asm/cputype.h>
  11 #include <asm/cacheflush.h>
  12
  13 #define CR_L2   (1 << 26)
  14
  15 #define CACHE_LINE_SIZE         32
  16 #define CACHE_LINE_SHIFT        5
  17 #define CACHE_WAY_PER_SET       8
  18
  19 #define CACHE_WAY_SIZE(l2ctype) (8192 << (((l2ctype) >> 8) & 0xf))
  20 #define CACHE_SET_SIZE(l2ctype) (CACHE_WAY_SIZE(l2ctype) >> CACHE_LINE_SHIFT)
  21
  22 static inline int xsc3_l2_present(void)
  23 {
  24         unsigned long l2ctype;
  25
  26         __asm__("mrc p15, 1, %0, c0, c0, 1" : "=r" (l2ctype));
  27
  28         return !!(l2ctype & 0xf8);
  29 }
  30
  31 static inline void xsc3_l2_clean_mva(unsigned long addr)
  32 {
  33         __asm__("mcr p15, 1, %0, c7, c11, 1" : : "r" (addr));
  34 }
  35
  36 static inline void xsc3_l2_inv_mva(unsigned long addr)
  37 {
  38         __asm__("mcr p15, 1, %0, c7, c7, 1" : : "r" (addr));
  39 }
  40
  41 static inline void xsc3_l2_inv_all(void)
  42 {
  43         unsigned long l2ctype, set_way;
  44         int set, way;
  45
  46         __asm__("mrc p15, 1, %0, c0, c0, 1" : "=r" (l2ctype));
  47
  48         for (set = 0; set < CACHE_SET_SIZE(l2ctype); set++) {
  49                 for (way = 0; way < CACHE_WAY_PER_SET; way++) {
  50                         set_way = (way << 29) | (set << 5);
  51                         __asm__("mcr p15, 1, %0, c7, c11, 2" : : "r"(set_way));
  52                 }
  53         }
  54
  55         dsb();
  56 }
  57
  58 static inline void l2_unmap_va(unsigned long va)
  59 {
  60 #ifdef CONFIG_HIGHMEM
  61         if (va != -1)
  62                 kunmap_atomic((void *)va);
  63 #endif
  64 }
  65
  66 static inline unsigned long l2_map_va(unsigned long pa, unsigned long prev_va)
  67 {
  68 #ifdef CONFIG_HIGHMEM
  69         unsigned long va = prev_va & PAGE_MASK;
  70         unsigned long pa_offset = pa << (32 - PAGE_SHIFT);
  71         if (unlikely(pa_offset < (prev_va << (32 - PAGE_SHIFT)))) {
  72                 /*
  73                  * Switching to a new page.  Because cache ops are
  74                  * using virtual addresses only, we must put a mapping
  75                  * in place for it.
  76                  */
  77                 l2_unmap_va(prev_va);
  78                 va = (unsigned long)kmap_atomic_pfn(pa >> PAGE_SHIFT);
  79         }
  80         return va + (pa_offset >> (32 - PAGE_SHIFT));
  81 #else
  82         return __phys_to_virt(pa);
  83 #endif
  84 }
  85
  86 static void xsc3_l2_inv_range(unsigned long start, unsigned long end)
  87 {
  88         unsigned long vaddr;
  89
  90         if (start == 0 && end == -1ul) {
  91                 xsc3_l2_inv_all();
  92                 return;
  93         }
  94
  95         vaddr = -1;  /* to force the first mapping */
  96
  97         /*
  98          * Clean and invalidate partial first cache line.
  99          */
 100         if (start & (CACHE_LINE_SIZE - 1)) {
 101                 vaddr = l2_map_va(start & ~(CACHE_LINE_SIZE - 1), vaddr);
 102                 xsc3_l2_clean_mva(vaddr);
 103                 xsc3_l2_inv_mva(vaddr);
 104                 start = (start | (CACHE_LINE_SIZE - 1)) + 1;
 105         }
 106
 107         /*
 108          * Invalidate all full cache lines between 'start' and 'end'.
 109          */
 110         while (start < (end & ~(CACHE_LINE_SIZE - 1))) {
 111                 vaddr = l2_map_va(start, vaddr);
 112                 xsc3_l2_inv_mva(vaddr);
 113                 start += CACHE_LINE_SIZE;
 114         }
 115
 116         /*
 117          * Clean and invalidate partial last cache line.
 118          */
 119         if (start < end) {
 120                 vaddr = l2_map_va(start, vaddr);
 121                 xsc3_l2_clean_mva(vaddr);
 122                 xsc3_l2_inv_mva(vaddr);
 123         }
 124
 125         l2_unmap_va(vaddr);
 126
 127         dsb();
 128 }
 129
 130 static void xsc3_l2_clean_range(unsigned long start, unsigned long end)
 131 {
 132         unsigned long vaddr;
 133
 134         vaddr = -1;  /* to force the first mapping */
 135
 136         start &= ~(CACHE_LINE_SIZE - 1);
 137         while (start < end) {
 138                 vaddr = l2_map_va(start, vaddr);
 139                 xsc3_l2_clean_mva(vaddr);
 140                 start += CACHE_LINE_SIZE;
 141         }
 142
 143         l2_unmap_va(vaddr);
 144
 145         dsb();
 146 }
 147
 148 /*
 149  * optimize L2 flush all operation by set/way format
 150  */
 151 static inline void xsc3_l2_flush_all(void)
 152 {
 153         unsigned long l2ctype, set_way;
 154         int set, way;
 155
 156         __asm__("mrc p15, 1, %0, c0, c0, 1" : "=r" (l2ctype));
 157
 158         for (set = 0; set < CACHE_SET_SIZE(l2ctype); set++) {
 159                 for (way = 0; way < CACHE_WAY_PER_SET; way++) {
 160                         set_way = (way << 29) | (set << 5);
 161                         __asm__("mcr p15, 1, %0, c7, c15, 2" : : "r"(set_way));
 162                 }
 163         }
 164
 165         dsb();
 166 }
 167
 168 static void xsc3_l2_flush_range(unsigned long start, unsigned long end)
 169 {
 170         unsigned long vaddr;
 171
 172         if (start == 0 && end == -1ul) {
 173                 xsc3_l2_flush_all();
 174                 return;
 175         }
 176
 177         vaddr = -1;  /* to force the first mapping */
 178
 179         start &= ~(CACHE_LINE_SIZE - 1);
 180         while (start < end) {
 181                 vaddr = l2_map_va(start, vaddr);
 182                 xsc3_l2_clean_mva(vaddr);
 183                 xsc3_l2_inv_mva(vaddr);
 184                 start += CACHE_LINE_SIZE;
 185         }
 186
 187         l2_unmap_va(vaddr);
 188
 189         dsb();
 190 }
 191
 192 static int __init xsc3_l2_init(void)
 193 {
 194         if (!cpu_is_xsc3() || !xsc3_l2_present())
 195                 return 0;
 196
 197         if (get_cr() & CR_L2) {
 198                 pr_info("XScale3 L2 cache enabled.\n");
 199                 xsc3_l2_inv_all();
 200
 201                 outer_cache.inv_range = xsc3_l2_inv_range;
 202                 outer_cache.clean_range = xsc3_l2_clean_range;
 203                 outer_cache.flush_range = xsc3_l2_flush_range;
 204         }
 205
 206         return 0;
 207 }
 208 core_initcall(xsc3_l2_init);