arch/sh/mm/cache-j2.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * arch/sh/mm/cache-j2.c
   4  *
   5  * Copyright (C) 2015-2016 Smart Energy Instruments, Inc.
   6  */
   7
   8 #include <linux/init.h>
   9 #include <linux/mm.h>
  10 #include <linux/cpumask.h>
  11
  12 #include <asm/cache.h>
  13 #include <asm/addrspace.h>
  14 #include <asm/processor.h>
  15 #include <asm/cacheflush.h>
  16 #include <asm/io.h>
  17
  18 #define ICACHE_ENABLE   0x1
  19 #define DCACHE_ENABLE   0x2
  20 #define CACHE_ENABLE    (ICACHE_ENABLE | DCACHE_ENABLE)
  21 #define ICACHE_FLUSH    0x100
  22 #define DCACHE_FLUSH    0x200
  23 #define CACHE_FLUSH     (ICACHE_FLUSH | DCACHE_FLUSH)
  24
  25 u32 __iomem *j2_ccr_base;
  26
  27 static void j2_flush_icache(void *args)
  28 {
  29         unsigned cpu;
  30         for_each_possible_cpu(cpu)
  31                 __raw_writel(CACHE_ENABLE | ICACHE_FLUSH, j2_ccr_base + cpu);
  32 }
  33
  34 static void j2_flush_dcache(void *args)
  35 {
  36         unsigned cpu;
  37         for_each_possible_cpu(cpu)
  38                 __raw_writel(CACHE_ENABLE | DCACHE_FLUSH, j2_ccr_base + cpu);
  39 }
  40
  41 static void j2_flush_both(void *args)
  42 {
  43         unsigned cpu;
  44         for_each_possible_cpu(cpu)
  45                 __raw_writel(CACHE_ENABLE | CACHE_FLUSH, j2_ccr_base + cpu);
  46 }
  47
  48 void __init j2_cache_init(void)
  49 {
  50         if (!j2_ccr_base)
  51                 return;
  52
  53         local_flush_cache_all = j2_flush_both;
  54         local_flush_cache_mm = j2_flush_both;
  55         local_flush_cache_dup_mm = j2_flush_both;
  56         local_flush_cache_page = j2_flush_both;
  57         local_flush_cache_range = j2_flush_both;
  58         local_flush_dcache_folio = j2_flush_dcache;
  59         local_flush_icache_range = j2_flush_icache;
  60         local_flush_icache_folio = j2_flush_icache;
  61         local_flush_cache_sigtramp = j2_flush_icache;
  62
  63         pr_info("Initial J2 CCR is %.8x\n", __raw_readl(j2_ccr_base));
  64 }