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1/*
2 * Copyright (C) 1997, 2001 Ralf Baechle (ralf@gnu.org),
3 * derived from r4xx0.c by David S. Miller (davem@davemloft.net).
4 */
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>
15#include <asm/system.h>
16#include <asm/mmu_context.h>
17#include <asm/r4kcache.h>
18
19/* Secondary cache size in bytes, if present. */
20static unsigned long scache_size;
21
22#define SC_LINE 32
23#define SC_PAGE (128*SC_LINE)
24
25static inline void blast_r5000_scache(void)
26{
27 unsigned long start = INDEX_BASE;
28 unsigned long end = start + scache_size;
29
30 while(start < end) {
31 cache_op(R5K_Page_Invalidate_S, start);
32 start += SC_PAGE;
33 }
34}
35
36static void r5k_dma_cache_inv_sc(unsigned long addr, unsigned long size)
37{
38 unsigned long end, a;
39
40 /* Catch bad driver code */
41 BUG_ON(size == 0);
42
43 if (size >= scache_size) {
44 blast_r5000_scache();
45 return;
46 }
47
48 /* On the R5000 secondary cache we cannot
49 * invalidate less than a page at a time.
50 * The secondary cache is physically indexed, write-through.
51 */
52 a = addr & ~(SC_PAGE - 1);
53 end = (addr + size - 1) & ~(SC_PAGE - 1);
54 while (a <= end) {
55 cache_op(R5K_Page_Invalidate_S, a);
56 a += SC_PAGE;
57 }
58}
59
60static void r5k_sc_enable(void)
61{
62 unsigned long flags;
63
64 local_irq_save(flags);
65 set_c0_config(R5K_CONF_SE);
66 blast_r5000_scache();
67 local_irq_restore(flags);
68}
69
70static void r5k_sc_disable(void)
71{
72 unsigned long flags;
73
74 local_irq_save(flags);
75 blast_r5000_scache();
76 clear_c0_config(R5K_CONF_SE);
77 local_irq_restore(flags);
78}
79
80static inline int __init r5k_sc_probe(void)
81{
82 unsigned long config = read_c0_config();
83
84 if (config & CONF_SC)
85 return(0);
86
87 scache_size = (512 * 1024) << ((config & R5K_CONF_SS) >> 20);
88
89 printk("R5000 SCACHE size %ldkB, linesize 32 bytes.\n",
90 scache_size >> 10);
91
92 return 1;
93}
94
95static struct bcache_ops r5k_sc_ops = {
96 .bc_enable = r5k_sc_enable,
97 .bc_disable = r5k_sc_disable,
98 .bc_wback_inv = r5k_dma_cache_inv_sc,
99 .bc_inv = r5k_dma_cache_inv_sc
100};
101
102void __cpuinit r5k_sc_init(void)
103{
104 if (r5k_sc_probe()) {
105 r5k_sc_enable();
106 bcops = &r5k_sc_ops;
107 }
108}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 1997, 2001 Ralf Baechle (ralf@gnu.org),
4 * derived from r4xx0.c by David S. Miller (davem@davemloft.net).
5 */
6#include <linux/init.h>
7#include <linux/kernel.h>
8#include <linux/sched.h>
9#include <linux/mm.h>
10
11#include <asm/mipsregs.h>
12#include <asm/bcache.h>
13#include <asm/cacheops.h>
14#include <asm/page.h>
15#include <asm/pgtable.h>
16#include <asm/mmu_context.h>
17#include <asm/r4kcache.h>
18
19/* Secondary cache size in bytes, if present. */
20static unsigned long scache_size;
21
22#define SC_LINE 32
23#define SC_PAGE (128*SC_LINE)
24
25static inline void blast_r5000_scache(void)
26{
27 unsigned long start = INDEX_BASE;
28 unsigned long end = start + scache_size;
29
30 while(start < end) {
31 cache_op(R5K_Page_Invalidate_S, start);
32 start += SC_PAGE;
33 }
34}
35
36static void r5k_dma_cache_inv_sc(unsigned long addr, unsigned long size)
37{
38 unsigned long end, a;
39
40 /* Catch bad driver code */
41 BUG_ON(size == 0);
42
43 if (size >= scache_size) {
44 blast_r5000_scache();
45 return;
46 }
47
48 /* On the R5000 secondary cache we cannot
49 * invalidate less than a page at a time.
50 * The secondary cache is physically indexed, write-through.
51 */
52 a = addr & ~(SC_PAGE - 1);
53 end = (addr + size - 1) & ~(SC_PAGE - 1);
54 while (a <= end) {
55 cache_op(R5K_Page_Invalidate_S, a);
56 a += SC_PAGE;
57 }
58}
59
60static void r5k_sc_enable(void)
61{
62 unsigned long flags;
63
64 local_irq_save(flags);
65 set_c0_config(R5K_CONF_SE);
66 blast_r5000_scache();
67 local_irq_restore(flags);
68}
69
70static void r5k_sc_disable(void)
71{
72 unsigned long flags;
73
74 local_irq_save(flags);
75 blast_r5000_scache();
76 clear_c0_config(R5K_CONF_SE);
77 local_irq_restore(flags);
78}
79
80static inline int __init r5k_sc_probe(void)
81{
82 unsigned long config = read_c0_config();
83
84 if (config & CONF_SC)
85 return 0;
86
87 scache_size = (512 * 1024) << ((config & R5K_CONF_SS) >> 20);
88
89 printk("R5000 SCACHE size %ldkB, linesize 32 bytes.\n",
90 scache_size >> 10);
91
92 return 1;
93}
94
95static struct bcache_ops r5k_sc_ops = {
96 .bc_enable = r5k_sc_enable,
97 .bc_disable = r5k_sc_disable,
98 .bc_wback_inv = r5k_dma_cache_inv_sc,
99 .bc_inv = r5k_dma_cache_inv_sc
100};
101
102void r5k_sc_init(void)
103{
104 if (r5k_sc_probe()) {
105 r5k_sc_enable();
106 bcops = &r5k_sc_ops;
107 }
108}