arch/arm/mm/cache-xsc3l2.c

   1 /*
   2  * arch/arm/mm/cache-xsc3l2.c - XScale3 L2 cache controller support
   3  *
   4  * Copyright (C) 2007 ARM Limited
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  18  */
  19 #include <linux/init.h>
  20 #include <linux/spinlock.h>
  21 #include <linux/io.h>
  22
  23 #include <asm/system.h>
  24 #include <asm/cputype.h>
  25 #include <asm/cacheflush.h>
  26
  27 #define CR_L2   (1 << 26)
  28
  29 #define CACHE_LINE_SIZE         32
  30 #define CACHE_LINE_SHIFT        5
  31 #define CACHE_WAY_PER_SET       8
  32
  33 #define CACHE_WAY_SIZE(l2ctype) (8192 << (((l2ctype) >> 8) & 0xf))
  34 #define CACHE_SET_SIZE(l2ctype) (CACHE_WAY_SIZE(l2ctype) >> CACHE_LINE_SHIFT)
  35
  36 static inline int xsc3_l2_present(void)
  37 {
  38         unsigned long l2ctype;
  39
  40         __asm__("mrc p15, 1, %0, c0, c0, 1" : "=r" (l2ctype));
  41
  42         return !!(l2ctype & 0xf8);
  43 }
  44
  45 static inline void xsc3_l2_clean_mva(unsigned long addr)
  46 {
  47         __asm__("mcr p15, 1, %0, c7, c11, 1" : : "r" (addr));
  48 }
  49
  50 static inline void xsc3_l2_clean_pa(unsigned long addr)
  51 {
  52         xsc3_l2_clean_mva(__phys_to_virt(addr));
  53 }
  54
  55 static inline void xsc3_l2_inv_mva(unsigned long addr)
  56 {
  57         __asm__("mcr p15, 1, %0, c7, c7, 1" : : "r" (addr));
  58 }
  59
  60 static inline void xsc3_l2_inv_pa(unsigned long addr)
  61 {
  62         xsc3_l2_inv_mva(__phys_to_virt(addr));
  63 }
  64
  65 static inline void xsc3_l2_inv_all(void)
  66 {
  67         unsigned long l2ctype, set_way;
  68         int set, way;
  69
  70         __asm__("mrc p15, 1, %0, c0, c0, 1" : "=r" (l2ctype));
  71
  72         for (set = 0; set < CACHE_SET_SIZE(l2ctype); set++) {
  73                 for (way = 0; way < CACHE_WAY_PER_SET; way++) {
  74                         set_way = (way << 29) | (set << 5);
  75                         __asm__("mcr p15, 1, %0, c7, c11, 2" : : "r"(set_way));
  76                 }
  77         }
  78
  79         dsb();
  80 }
  81
  82 static void xsc3_l2_inv_range(unsigned long start, unsigned long end)
  83 {
  84         if (start == 0 && end == -1ul) {
  85                 xsc3_l2_inv_all();
  86                 return;
  87         }
  88
  89         /*
  90          * Clean and invalidate partial first cache line.
  91          */
  92         if (start & (CACHE_LINE_SIZE - 1)) {
  93                 xsc3_l2_clean_pa(start & ~(CACHE_LINE_SIZE - 1));
  94                 xsc3_l2_inv_pa(start & ~(CACHE_LINE_SIZE - 1));
  95                 start = (start | (CACHE_LINE_SIZE - 1)) + 1;
  96         }
  97
  98         /*
  99          * Clean and invalidate partial last cache line.
 100          */
 101         if (end & (CACHE_LINE_SIZE - 1)) {
 102                 xsc3_l2_clean_pa(end & ~(CACHE_LINE_SIZE - 1));
 103                 xsc3_l2_inv_pa(end & ~(CACHE_LINE_SIZE - 1));
 104                 end &= ~(CACHE_LINE_SIZE - 1);
 105         }
 106
 107         /*
 108          * Invalidate all full cache lines between 'start' and 'end'.
 109          */
 110         while (start != end) {
 111                 xsc3_l2_inv_pa(start);
 112                 start += CACHE_LINE_SIZE;
 113         }
 114
 115         dsb();
 116 }
 117
 118 static void xsc3_l2_clean_range(unsigned long start, unsigned long end)
 119 {
 120         start &= ~(CACHE_LINE_SIZE - 1);
 121         while (start < end) {
 122                 xsc3_l2_clean_pa(start);
 123                 start += CACHE_LINE_SIZE;
 124         }
 125
 126         dsb();
 127 }
 128
 129 /*
 130  * optimize L2 flush all operation by set/way format
 131  */
 132 static inline void xsc3_l2_flush_all(void)
 133 {
 134         unsigned long l2ctype, set_way;
 135         int set, way;
 136
 137         __asm__("mrc p15, 1, %0, c0, c0, 1" : "=r" (l2ctype));
 138
 139         for (set = 0; set < CACHE_SET_SIZE(l2ctype); set++) {
 140                 for (way = 0; way < CACHE_WAY_PER_SET; way++) {
 141                         set_way = (way << 29) | (set << 5);
 142                         __asm__("mcr p15, 1, %0, c7, c15, 2" : : "r"(set_way));
 143                 }
 144         }
 145
 146         dsb();
 147 }
 148
 149 static void xsc3_l2_flush_range(unsigned long start, unsigned long end)
 150 {
 151         if (start == 0 && end == -1ul) {
 152                 xsc3_l2_flush_all();
 153                 return;
 154         }
 155
 156         start &= ~(CACHE_LINE_SIZE - 1);
 157         while (start < end) {
 158                 xsc3_l2_clean_pa(start);
 159                 xsc3_l2_inv_pa(start);
 160                 start += CACHE_LINE_SIZE;
 161         }
 162
 163         dsb();
 164 }
 165
 166 static int __init xsc3_l2_init(void)
 167 {
 168         if (!cpu_is_xsc3() || !xsc3_l2_present())
 169                 return 0;
 170
 171         if (!(get_cr() & CR_L2)) {
 172                 pr_info("XScale3 L2 cache enabled.\n");
 173                 adjust_cr(CR_L2, CR_L2);
 174                 xsc3_l2_inv_all();
 175         }
 176
 177         outer_cache.inv_range = xsc3_l2_inv_range;
 178         outer_cache.clean_range = xsc3_l2_clean_range;
 179         outer_cache.flush_range = xsc3_l2_flush_range;
 180
 181         return 0;
 182 }
 183 core_initcall(xsc3_l2_init);