arch/arm/mach-ux500/cache-l2x0.c

   1 /*
   2  * Copyright (C) ST-Ericsson SA 2011
   3  *
   4  * License terms: GNU General Public License (GPL) version 2
   5  */
   6
   7 #include <linux/io.h>
   8 #include <asm/cacheflush.h>
   9 #include <asm/hardware/cache-l2x0.h>
  10 #include <mach/hardware.h>
  11 #include <mach/id.h>
  12
  13 static void __iomem *l2x0_base;
  14
  15 static int __init ux500_l2x0_unlock(void)
  16 {
  17         int i;
  18
  19         /*
  20          * Unlock Data and Instruction Lock if locked. Ux500 U-Boot versions
  21          * apparently locks both caches before jumping to the kernel. The
  22          * l2x0 core will not touch the unlock registers if the l2x0 is
  23          * already enabled, so we do it right here instead. The PL310 has
  24          * 8 sets of registers, one per possible CPU.
  25          */
  26         for (i = 0; i < 8; i++) {
  27                 writel_relaxed(0x0, l2x0_base + L2X0_LOCKDOWN_WAY_D_BASE +
  28                                i * L2X0_LOCKDOWN_STRIDE);
  29                 writel_relaxed(0x0, l2x0_base + L2X0_LOCKDOWN_WAY_I_BASE +
  30                                i * L2X0_LOCKDOWN_STRIDE);
  31         }
  32         return 0;
  33 }
  34
  35 static int __init ux500_l2x0_init(void)
  36 {
  37         if (cpu_is_u5500())
  38                 l2x0_base = __io_address(U5500_L2CC_BASE);
  39         else if (cpu_is_u8500())
  40                 l2x0_base = __io_address(U8500_L2CC_BASE);
  41         else
  42                 ux500_unknown_soc();
  43
  44         /* Unlock before init */
  45         ux500_l2x0_unlock();
  46
  47         /* 64KB way size, 8 way associativity, force WA */
  48         l2x0_init(l2x0_base, 0x3e060000, 0xc0000fff);
  49
  50         /*
  51          * We can't disable l2 as we are in non secure mode, currently
  52          * this seems be called only during kexec path. So let's
  53          * override outer.disable with nasty assignment until we have
  54          * some SMI service available.
  55          */
  56         outer_cache.disable = NULL;
  57
  58         return 0;
  59 }
  60
  61 early_initcall(ux500_l2x0_init);