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Linux/arch/sh/mm/cache-j2.c

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  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 }
 66 

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