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 <linux/of.h>
   9
  10 #include <asm/cacheflush.h>
  11 #include <asm/hardware/cache-l2x0.h>
  12
  13 #include "db8500-regs.h"
  14 #include "id.h"
  15
  16 static void __iomem *l2x0_base;
  17
  18 static int __init ux500_l2x0_unlock(void)
  19 {
  20         int i;
  21
  22         /*
  23          * Unlock Data and Instruction Lock if locked. Ux500 U-Boot versions
  24          * apparently locks both caches before jumping to the kernel. The
  25          * l2x0 core will not touch the unlock registers if the l2x0 is
  26          * already enabled, so we do it right here instead. The PL310 has
  27          * 8 sets of registers, one per possible CPU.
  28          */
  29         for (i = 0; i < 8; i++) {
  30                 writel_relaxed(0x0, l2x0_base + L2X0_LOCKDOWN_WAY_D_BASE +
  31                                i * L2X0_LOCKDOWN_STRIDE);
  32                 writel_relaxed(0x0, l2x0_base + L2X0_LOCKDOWN_WAY_I_BASE +
  33                                i * L2X0_LOCKDOWN_STRIDE);
  34         }
  35         return 0;
  36 }
  37
  38 static void ux500_l2c310_write_sec(unsigned long val, unsigned reg)
  39 {
  40         /*
  41          * We can't write to secure registers as we are in non-secure
  42          * mode, until we have some SMI service available.
  43          */
  44 }
  45
  46 static int __init ux500_l2x0_init(void)
  47 {
  48         if (cpu_is_u8500_family() || cpu_is_ux540_family())
  49                 l2x0_base = __io_address(U8500_L2CC_BASE);
  50         else
  51                 /* Non-Ux500 platform */
  52                 return -ENODEV;
  53
  54         /* Unlock before init */
  55         ux500_l2x0_unlock();
  56
  57         outer_cache.write_sec = ux500_l2c310_write_sec;
  58
  59         if (of_have_populated_dt())
  60                 l2x0_of_init(0, ~0);
  61         else
  62                 l2x0_init(l2x0_base, 0, ~0);
  63
  64         return 0;
  65 }
  66
  67 early_initcall(ux500_l2x0_init);