arch/sh/mm/cache-j2.c

   1 /*
   2  * arch/sh/mm/cache-j2.c
   3  *
   4  * Copyright (C) 2015-2016 Smart Energy Instruments, Inc.
   5  *
   6  * Released under the terms of the GNU GPL v2.0.
   7  */
   8
   9 #include <linux/init.h>
  10 #include <linux/mm.h>
  11 #include <linux/cpumask.h>
  12
  13 #include <asm/cache.h>
  14 #include <asm/addrspace.h>
  15 #include <asm/processor.h>
  16 #include <asm/cacheflush.h>
  17 #include <asm/io.h>
  18
  19 #define ICACHE_ENABLE   0x1
  20 #define DCACHE_ENABLE   0x2
  21 #define CACHE_ENABLE    (ICACHE_ENABLE | DCACHE_ENABLE)
  22 #define ICACHE_FLUSH    0x100
  23 #define DCACHE_FLUSH    0x200
  24 #define CACHE_FLUSH     (ICACHE_FLUSH | DCACHE_FLUSH)
  25
  26 u32 __iomem *j2_ccr_base;
  27
  28 static void j2_flush_icache(void *args)
  29 {
  30         unsigned cpu;
  31         for_each_possible_cpu(cpu)
  32                 __raw_writel(CACHE_ENABLE | ICACHE_FLUSH, j2_ccr_base + cpu);
  33 }
  34
  35 static void j2_flush_dcache(void *args)
  36 {
  37         unsigned cpu;
  38         for_each_possible_cpu(cpu)
  39                 __raw_writel(CACHE_ENABLE | DCACHE_FLUSH, j2_ccr_base + cpu);
  40 }
  41
  42 static void j2_flush_both(void *args)
  43 {
  44         unsigned cpu;
  45         for_each_possible_cpu(cpu)
  46                 __raw_writel(CACHE_ENABLE | CACHE_FLUSH, j2_ccr_base + cpu);
  47 }
  48
  49 void __init j2_cache_init(void)
  50 {
  51         if (!j2_ccr_base)
  52                 return;
  53
  54         local_flush_cache_all = j2_flush_both;
  55         local_flush_cache_mm = j2_flush_both;
  56         local_flush_cache_dup_mm = j2_flush_both;
  57         local_flush_cache_page = j2_flush_both;
  58         local_flush_cache_range = j2_flush_both;
  59         local_flush_dcache_page = j2_flush_dcache;
  60         local_flush_icache_range = j2_flush_icache;
  61         local_flush_icache_page = j2_flush_icache;
  62         local_flush_cache_sigtramp = j2_flush_icache;
  63
  64         pr_info("Initial J2 CCR is %.8x\n", __raw_readl(j2_ccr_base));
  65 }