GNU Linux-libre 4.19.314-gnu1
[releases.git] / 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 }