blob: 0216ed6eaa2a931cda5c7a425c5327d8342dd53a [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Copyright (C) 1997, 2001 Ralf Baechle (ralf@gnu.org),
Justin P. Mattock79add622011-04-04 14:15:29 -07003 * derived from r4xx0.c by David S. Miller (davem@davemloft.net).
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 */
5#include <linux/init.h>
6#include <linux/kernel.h>
7#include <linux/sched.h>
8#include <linux/mm.h>
9
10#include <asm/mipsregs.h>
11#include <asm/bcache.h>
12#include <asm/cacheops.h>
13#include <asm/page.h>
14#include <asm/pgtable.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <asm/mmu_context.h>
16#include <asm/r4kcache.h>
17
18/* Secondary cache size in bytes, if present. */
19static unsigned long scache_size;
20
21#define SC_LINE 32
22#define SC_PAGE (128*SC_LINE)
23
24static inline void blast_r5000_scache(void)
25{
26 unsigned long start = INDEX_BASE;
27 unsigned long end = start + scache_size;
28
29 while(start < end) {
30 cache_op(R5K_Page_Invalidate_S, start);
31 start += SC_PAGE;
32 }
33}
34
35static void r5k_dma_cache_inv_sc(unsigned long addr, unsigned long size)
36{
37 unsigned long end, a;
38
39 /* Catch bad driver code */
40 BUG_ON(size == 0);
41
42 if (size >= scache_size) {
43 blast_r5000_scache();
44 return;
45 }
46
47 /* On the R5000 secondary cache we cannot
48 * invalidate less than a page at a time.
49 * The secondary cache is physically indexed, write-through.
50 */
51 a = addr & ~(SC_PAGE - 1);
52 end = (addr + size - 1) & ~(SC_PAGE - 1);
53 while (a <= end) {
54 cache_op(R5K_Page_Invalidate_S, a);
55 a += SC_PAGE;
56 }
57}
58
59static void r5k_sc_enable(void)
60{
Ralf Baechle70342282013-01-22 12:59:30 +010061 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
63 local_irq_save(flags);
64 set_c0_config(R5K_CONF_SE);
65 blast_r5000_scache();
66 local_irq_restore(flags);
67}
68
69static void r5k_sc_disable(void)
70{
Ralf Baechle70342282013-01-22 12:59:30 +010071 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
73 local_irq_save(flags);
74 blast_r5000_scache();
75 clear_c0_config(R5K_CONF_SE);
76 local_irq_restore(flags);
77}
78
79static inline int __init r5k_sc_probe(void)
80{
81 unsigned long config = read_c0_config();
82
83 if (config & CONF_SC)
84 return(0);
85
86 scache_size = (512 * 1024) << ((config & R5K_CONF_SS) >> 20);
87
88 printk("R5000 SCACHE size %ldkB, linesize 32 bytes.\n",
89 scache_size >> 10);
90
91 return 1;
92}
93
94static struct bcache_ops r5k_sc_ops = {
95 .bc_enable = r5k_sc_enable,
96 .bc_disable = r5k_sc_disable,
97 .bc_wback_inv = r5k_dma_cache_inv_sc,
98 .bc_inv = r5k_dma_cache_inv_sc
99};
100
Paul Gortmaker078a55f2013-06-18 13:38:59 +0000101void r5k_sc_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102{
103 if (r5k_sc_probe()) {
104 r5k_sc_enable();
105 bcops = &r5k_sc_ops;
106 }
107}