arch/arm/mm/cache-l2x0.c

   1 /*
   2  * arch/arm/mm/cache-l2x0.c - L210/L220 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/cacheflush.h>
  24 #include <asm/hardware/cache-l2x0.h>
  25
  26 #define CACHE_LINE_SIZE         32
  27
  28 static void __iomem *l2x0_base;
  29 static DEFINE_SPINLOCK(l2x0_lock);
  30
  31 static inline void sync_writel(unsigned long val, unsigned long reg,
  32                                unsigned long complete_mask)
  33 {
  34         unsigned long flags;
  35
  36         spin_lock_irqsave(&l2x0_lock, flags);
  37         writel(val, l2x0_base + reg);
  38         /* wait for the operation to complete */
  39         while (readl(l2x0_base + reg) & complete_mask)
  40                 ;
  41         spin_unlock_irqrestore(&l2x0_lock, flags);
  42 }
  43
  44 static inline void cache_sync(void)
  45 {
  46         sync_writel(0, L2X0_CACHE_SYNC, 1);
  47 }
  48
  49 static inline void l2x0_inv_all(void)
  50 {
  51         /* invalidate all ways */
  52         sync_writel(0xff, L2X0_INV_WAY, 0xff);
  53         cache_sync();
  54 }
  55
  56 static void l2x0_inv_range(unsigned long start, unsigned long end)
  57 {
  58         unsigned long addr;
  59
  60         if (start & (CACHE_LINE_SIZE - 1)) {
  61                 start &= ~(CACHE_LINE_SIZE - 1);
  62                 sync_writel(start, L2X0_CLEAN_INV_LINE_PA, 1);
  63                 start += CACHE_LINE_SIZE;
  64         }
  65
  66         if (end & (CACHE_LINE_SIZE - 1)) {
  67                 end &= ~(CACHE_LINE_SIZE - 1);
  68                 sync_writel(end, L2X0_CLEAN_INV_LINE_PA, 1);
  69         }
  70
  71         for (addr = start; addr < end; addr += CACHE_LINE_SIZE)
  72                 sync_writel(addr, L2X0_INV_LINE_PA, 1);
  73         cache_sync();
  74 }
  75
  76 static void l2x0_clean_range(unsigned long start, unsigned long end)
  77 {
  78         unsigned long addr;
  79
  80         start &= ~(CACHE_LINE_SIZE - 1);
  81         for (addr = start; addr < end; addr += CACHE_LINE_SIZE)
  82                 sync_writel(addr, L2X0_CLEAN_LINE_PA, 1);
  83         cache_sync();
  84 }
  85
  86 static void l2x0_flush_range(unsigned long start, unsigned long end)
  87 {
  88         unsigned long addr;
  89
  90         start &= ~(CACHE_LINE_SIZE - 1);
  91         for (addr = start; addr < end; addr += CACHE_LINE_SIZE)
  92                 sync_writel(addr, L2X0_CLEAN_INV_LINE_PA, 1);
  93         cache_sync();
  94 }
  95
  96 void __init l2x0_init(void __iomem *base, __u32 aux_val, __u32 aux_mask)
  97 {
  98         __u32 aux;
  99
 100         l2x0_base = base;
 101
 102         /* disable L2X0 */
 103         writel(0, l2x0_base + L2X0_CTRL);
 104
 105         aux = readl(l2x0_base + L2X0_AUX_CTRL);
 106         aux &= aux_mask;
 107         aux |= aux_val;
 108         writel(aux, l2x0_base + L2X0_AUX_CTRL);
 109
 110         l2x0_inv_all();
 111
 112         /* enable L2X0 */
 113         writel(1, l2x0_base + L2X0_CTRL);
 114
 115         outer_cache.inv_range = l2x0_inv_range;
 116         outer_cache.clean_range = l2x0_clean_range;
 117         outer_cache.flush_range = l2x0_flush_range;
 118
 119         printk(KERN_INFO "L2X0 cache controller enabled\n");
 120 }