2 * Copyright (C) 1997, 2001 Ralf Baechle (ralf@gnu.org),
3 * derived from r4xx0.c by David S. Miller (dm@engr.sgi.com).
5 #include <linux/init.h>
6 #include <linux/kernel.h>
7 #include <linux/sched.h>
10 #include <asm/mipsregs.h>
11 #include <asm/bcache.h>
12 #include <asm/cacheops.h>
14 #include <asm/pgtable.h>
15 #include <asm/system.h>
16 #include <asm/mmu_context.h>
18 /* Secondary cache size in bytes, if present. */
19 static unsigned long scache_size;
22 #define SC_PAGE (128*SC_LINE)
24 #define cache_op(base,op) \
25 __asm__ __volatile__(" \
35 static inline void blast_r5000_scache(void)
37 unsigned long start = KSEG0;
38 unsigned long end = KSEG0 + scache_size;
41 cache_op(start, R5K_Page_Invalidate_S);
46 static void r5k_dma_cache_inv_sc(unsigned long addr, unsigned long size)
50 /* Catch bad driver code */
53 if (size >= scache_size) {
58 /* On the R5000 secondary cache we cannot
59 * invalidate less than a page at a time.
60 * The secondary cache is physically indexed, write-through.
62 a = addr & ~(SC_PAGE - 1);
63 end = (addr + size - 1) & ~(SC_PAGE - 1);
65 cache_op(a, R5K_Page_Invalidate_S);
70 static void r5k_sc_enable(void)
74 local_irq_save(flags);
75 change_c0_config(R5K_CONF_SE, R5K_CONF_SE);
77 local_irq_restore(flags);
80 static void r5k_sc_disable(void)
84 local_irq_save(flags);
86 change_c0_config(R5K_CONF_SE, 0);
87 local_irq_restore(flags);
90 static inline int __init r5k_sc_probe(void)
92 unsigned long config = read_c0_config();
97 scache_size = (512 * 1024) << ((config & R5K_CONF_SS) >> 20);
99 printk("R5000 SCACHE size %ldkB, linesize 32 bytes.\n",
105 static struct bcache_ops r5k_sc_ops = {
106 .bc_enable = r5k_sc_enable,
107 .bc_disable = r5k_sc_disable,
108 .bc_wback_inv = r5k_dma_cache_inv_sc,
109 .bc_inv = r5k_dma_cache_inv_sc
112 void __init r5k_sc_init(void)
114 if (r5k_sc_probe()) {